select GENERIC_IOMAP
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
+ select GENERIC_KERNEL_EXECVE
+ select GENERIC_KERNEL_THREAD
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select HARDIRQS_SW_RESEND
extern struct task_struct *cpu_switch_to(struct task_struct *prev,
struct task_struct *next);
-/*
- * Create a new kernel thread
- */
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
#define task_pt_regs(p) \
((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
/*
* System call wrappers implemented in kernel/entry.S.
*/
-asmlinkage long sys_execve_wrapper(const char __user *filename,
- const char __user *const __user *argv,
- const char __user *const __user *envp);
-asmlinkage long sys_clone_wrapper(unsigned long clone_flags,
- unsigned long newsp,
- void __user *parent_tid,
- unsigned long tls_val,
- void __user *child_tid);
asmlinkage long sys_rt_sigreturn_wrapper(void);
asmlinkage long sys_sigaltstack_wrapper(const stack_t __user *uss,
stack_t __user *uoss);
+/*
+ * AArch64 sys_clone implementation has a different prototype than the generic
+ * one (additional TLS value argument).
+ */
+#define sys_clone sys_clone
+
#include <asm-generic/syscalls.h>
#endif /* __ASM_SYSCALLS_H */
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_COMPAT_SYS_SENDFILE
#endif
+#define __ARCH_WANT_SYS_EXECVE
#include <uapi/asm/unistd.h>
__SYSCALL(0, sys_restart_syscall)
__SYSCALL(1, sys_exit)
-__SYSCALL(2, compat_sys_fork_wrapper)
+__SYSCALL(2, compat_sys_fork)
__SYSCALL(3, sys_read)
__SYSCALL(4, sys_write)
__SYSCALL(5, compat_sys_open)
__SYSCALL(8, sys_creat)
__SYSCALL(9, sys_link)
__SYSCALL(10, sys_unlink)
-__SYSCALL(11, compat_sys_execve_wrapper)
+__SYSCALL(11, compat_sys_execve)
__SYSCALL(12, sys_chdir)
__SYSCALL(13, sys_ni_syscall) /* 13 was sys_time */
__SYSCALL(14, sys_mknod)
__SYSCALL(117, sys_ni_syscall) /* 117 was sys_ipc */
__SYSCALL(118, sys_fsync)
__SYSCALL(119, compat_sys_sigreturn_wrapper)
-__SYSCALL(120, compat_sys_clone_wrapper)
+__SYSCALL(120, sys_clone)
__SYSCALL(121, sys_setdomainname)
__SYSCALL(122, sys_newuname)
__SYSCALL(123, sys_ni_syscall) /* 123 was sys_modify_ldt */
__SYSCALL(187, compat_sys_sendfile)
__SYSCALL(188, sys_ni_syscall) /* 188 reserved */
__SYSCALL(189, sys_ni_syscall) /* 189 reserved */
-__SYSCALL(190, compat_sys_vfork_wrapper)
+__SYSCALL(190, compat_sys_vfork)
__SYSCALL(191, compat_sys_getrlimit) /* SuS compliant getrlimit */
__SYSCALL(192, sys_mmap_pgoff)
__SYSCALL(193, compat_sys_truncate64_wrapper)
/*
* "slow" syscall return path.
*/
-ENTRY(ret_to_user)
+ret_to_user:
disable_irq // disable interrupts
ldr x1, [tsk, #TI_FLAGS]
and x2, x1, #_TIF_WORK_MASK
*/
ENTRY(ret_from_fork)
bl schedule_tail
- get_thread_info tsk
+ cbz x19, 1f // not a kernel thread
+ mov x0, x20
+ blr x19
+1: get_thread_info tsk
b ret_to_user
ENDPROC(ret_from_fork)
/*
* Special system call wrappers.
*/
-ENTRY(sys_execve_wrapper)
- mov x3, sp
- b sys_execve
-ENDPROC(sys_execve_wrapper)
-
-ENTRY(sys_clone_wrapper)
- mov x5, sp
- b sys_clone
-ENDPROC(sys_clone_wrapper)
-
ENTRY(sys_rt_sigreturn_wrapper)
mov x0, sp
b sys_rt_sigreturn
struct pt_regs *childregs = task_pt_regs(p);
unsigned long tls = p->thread.tp_value;
- *childregs = *regs;
- childregs->regs[0] = 0;
+ memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
- if (is_compat_thread(task_thread_info(p)))
- childregs->compat_sp = stack_start;
- else {
+ if (likely(regs)) {
+ *childregs = *regs;
+ childregs->regs[0] = 0;
+ if (is_compat_thread(task_thread_info(p))) {
+ if (stack_start)
+ childregs->compat_sp = stack_start;
+ } else {
+ /*
+ * Read the current TLS pointer from tpidr_el0 as it may be
+ * out-of-sync with the saved value.
+ */
+ asm("mrs %0, tpidr_el0" : "=r" (tls));
+ if (stack_start) {
+ /* 16-byte aligned stack mandatory on AArch64 */
+ if (stack_start & 15)
+ return -EINVAL;
+ childregs->sp = stack_start;
+ }
+ }
/*
- * Read the current TLS pointer from tpidr_el0 as it may be
- * out-of-sync with the saved value.
+ * If a TLS pointer was passed to clone (4th argument), use it
+ * for the new thread.
*/
- asm("mrs %0, tpidr_el0" : "=r" (tls));
- childregs->sp = stack_start;
+ if (clone_flags & CLONE_SETTLS)
+ tls = regs->regs[3];
+ } else {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->pstate = PSR_MODE_EL1h;
+ p->thread.cpu_context.x19 = stack_start;
+ p->thread.cpu_context.x20 = stk_sz;
}
-
- memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
- p->thread.cpu_context.sp = (unsigned long)childregs;
p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
-
- /* If a TLS pointer was passed to clone, use that for the new thread. */
- if (clone_flags & CLONE_SETTLS)
- tls = regs->regs[3];
+ p->thread.cpu_context.sp = (unsigned long)childregs;
p->thread.tp_value = tls;
ptrace_hw_copy_thread(p);
return last;
}
-/*
- * Shuffle the argument into the correct register before calling the
- * thread function. x1 is the thread argument, x2 is the pointer to
- * the thread function, and x3 points to the exit function.
- */
-extern void kernel_thread_helper(void);
-asm( ".section .text\n"
-" .align\n"
-" .type kernel_thread_helper, #function\n"
-"kernel_thread_helper:\n"
-" mov x0, x1\n"
-" mov x30, x3\n"
-" br x2\n"
-" .size kernel_thread_helper, . - kernel_thread_helper\n"
-" .previous");
-
-#define kernel_thread_exit do_exit
-
-/*
- * Create a kernel thread.
- */
-pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- regs.regs[1] = (unsigned long)arg;
- regs.regs[2] = (unsigned long)fn;
- regs.regs[3] = (unsigned long)kernel_thread_exit;
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.pstate = PSR_MODE_EL1h;
-
- return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
unsigned long get_wchan(struct task_struct *p)
{
struct stackframe frame;
*/
asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
int __user *parent_tidptr, unsigned long tls_val,
- int __user *child_tidptr, struct pt_regs *regs)
+ int __user *child_tidptr)
{
- if (!newsp)
- newsp = regs->sp;
- /* 16-byte aligned stack mandatory on AArch64 */
- if (newsp & 15)
- return -EINVAL;
- return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage long sys_execve(const char __user *filenamei,
- const char __user *const __user *argv,
- const char __user *const __user *envp,
- struct pt_regs *regs)
-{
- long error;
- struct filename *filename;
-
- filename = getname(filenamei);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename->name, argv, envp, regs);
- putname(filename);
-out:
- return error;
-}
-
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- struct pt_regs regs;
- int ret;
-
- memset(®s, 0, sizeof(struct pt_regs));
- ret = do_execve(filename,
- (const char __user *const __user *)argv,
- (const char __user *const __user *)envp, ®s);
- if (ret < 0)
- goto out;
-
- /*
- * Save argc to the register structure for userspace.
- */
- regs.regs[0] = ret;
-
- /*
- * We were successful. We won't be returning to our caller, but
- * instead to user space by manipulating the kernel stack.
- */
- asm( "add x0, %0, %1\n\t"
- "mov x1, %2\n\t"
- "mov x2, %3\n\t"
- "bl memmove\n\t" /* copy regs to top of stack */
- "mov x27, #0\n\t" /* not a syscall */
- "mov x28, %0\n\t" /* thread structure */
- "mov sp, x0\n\t" /* reposition stack pointer */
- "b ret_to_user"
- :
- : "r" (current_thread_info()),
- "Ir" (THREAD_START_SP - sizeof(regs)),
- "r" (®s),
- "Ir" (sizeof(regs))
- : "x0", "x1", "x2", "x27", "x28", "x30", "memory");
-
- out:
- return ret;
+ return do_fork(clone_flags, newsp, current_pt_regs(), 0,
+ parent_tidptr, child_tidptr);
}
-EXPORT_SYMBOL(kernel_execve);
asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
/*
* Wrappers to pass the pt_regs argument.
*/
-#define sys_execve sys_execve_wrapper
-#define sys_clone sys_clone_wrapper
#define sys_rt_sigreturn sys_rt_sigreturn_wrapper
#define sys_sigaltstack sys_sigaltstack_wrapper
/*
* System call wrappers for the AArch32 compatibility layer.
*/
-compat_sys_fork_wrapper:
- mov x0, sp
- b compat_sys_fork
-ENDPROC(compat_sys_fork_wrapper)
-
-compat_sys_vfork_wrapper:
- mov x0, sp
- b compat_sys_vfork
-ENDPROC(compat_sys_vfork_wrapper)
-
-compat_sys_execve_wrapper:
- mov x3, sp
- b compat_sys_execve
-ENDPROC(compat_sys_execve_wrapper)
-
-compat_sys_clone_wrapper:
- mov x5, sp
- b compat_sys_clone
-ENDPROC(compat_sys_clone_wrapper)
compat_sys_sigreturn_wrapper:
mov x0, sp
#include <asm/cacheflush.h>
#include <asm/unistd32.h>
-asmlinkage int compat_sys_fork(struct pt_regs *regs)
+asmlinkage int compat_sys_fork(void)
{
- return do_fork(SIGCHLD, regs->compat_sp, regs, 0, NULL, NULL);
+ return do_fork(SIGCHLD, 0, current_pt_regs(), 0, NULL, NULL);
}
-asmlinkage int compat_sys_clone(unsigned long clone_flags, unsigned long newsp,
- int __user *parent_tidptr, int tls_val,
- int __user *child_tidptr, struct pt_regs *regs)
+asmlinkage int compat_sys_vfork(void)
{
- if (!newsp)
- newsp = regs->compat_sp;
-
- return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
-}
-
-asmlinkage int compat_sys_vfork(struct pt_regs *regs)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->compat_sp,
- regs, 0, NULL, NULL);
-}
-
-asmlinkage int compat_sys_execve(const char __user *filenamei,
- compat_uptr_t argv, compat_uptr_t envp,
- struct pt_regs *regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname(filenamei);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = compat_do_execve(filename->name, compat_ptr(argv),
- compat_ptr(envp), regs);
- putname(filename);
-out:
- return error;
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
+ current_pt_regs(), 0, NULL, NULL);
}
asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
select GENERIC_CLOCKEVENTS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
help
AVR32 is a high-performance 32-bit RISC microprocessor core,
designed for cost-sensitive embedded applications, with particular
/* Free all resources held by a thread */
extern void release_thread(struct task_struct *);
-/* Create a kernel thread without removing it from tasklists */
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
/* Return saved PC of a blocked thread */
#define thread_saved_pc(tsk) ((tsk)->thread.cpu_context.pc)
#define __ARCH_WANT_SYS_GETPGRP
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls
obj-$(CONFIG_SUBARCH_AVR32B) += entry-avr32b.o
obj-y += syscall_table.o syscall-stubs.o irq.o
obj-y += setup.o traps.o ocd.o ptrace.o
-obj-y += signal.o sys_avr32.o process.o time.o
+obj-y += signal.o process.o time.o
obj-y += switch_to.o cpu.o
obj-$(CONFIG_MODULES) += module.o avr32_ksyms.o
obj-$(CONFIG_KPROBES) += kprobes.o
.global ret_from_fork
ret_from_fork:
call schedule_tail
+ mov r12, 0
+ rjmp syscall_return
- /* check for syscall tracing */
- get_thread_info r0
- ld.w r1, r0[TI_flags]
- andl r1, _TIF_ALLWORK_MASK, COH
- brne syscall_exit_work
- rjmp syscall_exit_cont
+ .global ret_from_kernel_thread
+ret_from_kernel_thread:
+ call schedule_tail
+ mov r12, r0
+ mov lr, r2 /* syscall_return */
+ mov pc, r1
syscall_trace_enter:
pushm r8-r12
while (1) ;
}
-/*
- * PC is actually discarded when returning from a system call -- the
- * return address must be stored in LR. This function will make sure
- * LR points to do_exit before starting the thread.
- *
- * Also, when returning from fork(), r12 is 0, so we must copy the
- * argument as well.
- *
- * r0 : The argument to the main thread function
- * r1 : The address of do_exit
- * r2 : The address of the main thread function
- */
-asmlinkage extern void kernel_thread_helper(void);
-__asm__(" .type kernel_thread_helper, @function\n"
- "kernel_thread_helper:\n"
- " mov r12, r0\n"
- " mov lr, r2\n"
- " mov pc, r1\n"
- " .size kernel_thread_helper, . - kernel_thread_helper");
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- regs.r0 = (unsigned long)arg;
- regs.r1 = (unsigned long)fn;
- regs.r2 = (unsigned long)do_exit;
- regs.lr = (unsigned long)kernel_thread_helper;
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.sr = MODE_SUPERVISOR;
-
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
- 0, ®s, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Free current thread data structures etc
*/
}
asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
+asmlinkage void syscall_return(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
- struct pt_regs *childregs;
-
- childregs = ((struct pt_regs *)(THREAD_SIZE + (unsigned long)task_stack_page(p))) - 1;
- *childregs = *regs;
-
- if (user_mode(regs))
+ struct pt_regs *childregs = task_pt_regs(p);
+
+ if (unlikely(!regs)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ p->thread.cpu_context.r0 = arg;
+ p->thread.cpu_context.r1 = usp; /* fn */
+ p->thread.cpu_context.r2 = syscall_return;
+ p->thread.cpu_context.pc = (unsigned long)ret_from_kernel_thread;
+ childregs->sr = MODE_SUPERVISOR;
+ } else {
+ *childregs = *regs;
childregs->sp = usp;
- else
- childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
-
- childregs->r12 = 0; /* Set return value for child */
+ childregs->r12 = 0; /* Set return value for child */
+ p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
+ }
p->thread.cpu_context.sr = MODE_SUPERVISOR | SR_GM;
p->thread.cpu_context.ksp = (unsigned long)childregs;
- p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
clear_tsk_thread_flag(p, TIF_DEBUG);
if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
0, NULL, NULL);
}
-asmlinkage int sys_execve(const char __user *ufilename,
- const char __user *const __user *uargv,
- const char __user *const __user *uenvp,
- struct pt_regs *regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname(ufilename);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename->name, uargv, uenvp, regs);
- putname(filename);
-
-out:
- return error;
-}
-
-
/*
* This function is supposed to answer the question "who called
* schedule()?"
+++ /dev/null
-/*
- * Copyright (C) 2004-2006 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/unistd.h>
-
-int kernel_execve(const char *file,
- const char *const *argv,
- const char *const *envp)
-{
- register long scno asm("r8") = __NR_execve;
- register long sc1 asm("r12") = (long)file;
- register long sc2 asm("r11") = (long)argv;
- register long sc3 asm("r10") = (long)envp;
-
- asm volatile("scall"
- : "=r"(sc1)
- : "r"(scno), "0"(sc1), "r"(sc2), "r"(sc3)
- : "cc", "memory");
- return sc1;
-}
mov r12, sp
rjmp sys_vfork
- .global __sys_execve
- .type __sys_execve,@function
-__sys_execve:
- mov r9, sp
- rjmp sys_execve
-
.global __sys_mmap2
.type __sys_mmap2,@function
__sys_mmap2:
.long sys_creat
.long sys_link
.long sys_unlink /* 10 */
- .long __sys_execve
+ .long sys_execve
.long sys_chdir
.long sys_time
.long sys_mknod
select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
config GENERIC_CSUM
def_bool y
{
}
-extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
-
/*
* Free current thread data structures etc..
*/
#define __ARCH_WANT_SYS_NICE
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls
SP += -12;
pseudo_long_call _schedule_tail, p5;
SP += 12;
- r0 = [sp + PT_IPEND];
- cc = bittst(r0,1);
- if cc jump .Lin_kernel;
+ p1 = [sp++];
+ r0 = [sp++];
+ cc = p1 == 0;
+ if cc jump .Lfork;
+ sp += -12;
+ call (p1);
+ sp += 12;
+.Lfork:
RESTORE_CONTEXT
rti;
-.Lin_kernel:
- bitclr(r0,1);
- [sp + PT_IPEND] = r0;
- /* do a 'fake' RTI by jumping to [RETI]
- * to avoid clearing supervisor mode in child
- */
- r0 = [sp + PT_PC];
- [sp + PT_P0] = r0;
-
- RESTORE_ALL_SYS
- jump (p0);
ENDPROC(_ret_from_fork)
ENTRY(_sys_vfork)
}
}
-/*
- * This gets run with P1 containing the
- * function to call, and R1 containing
- * the "args". Note P0 is clobbered on the way here.
- */
-void kernel_thread_helper(void);
-__asm__(".section .text\n"
- ".align 4\n"
- "_kernel_thread_helper:\n\t"
- "\tsp += -12;\n\t"
- "\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");
-
-/*
- * Create a kernel thread.
- */
-pid_t kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- regs.r1 = (unsigned long)arg;
- regs.p1 = (unsigned long)fn;
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.orig_p0 = -1;
- /* Set bit 2 to tell ret_from_fork we should be returning to kernel
- mode. */
- regs.ipend = 0x8002;
- __asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
- NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Do necessary setup to start up a newly executed thread.
*
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
+ unsigned long *v;
childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
- *childregs = *regs;
- childregs->r0 = 0;
+ v = ((unsigned long *)childregs) - 2;
+ if (unlikely(!regs)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ v[0] = usp;
+ v[1] = topstk;
+ childregs->orig_p0 = -1;
+ childregs->ipend = 0x8000;
+ __asm__ __volatile__("%0 = syscfg;":"=da"(childregs->syscfg):);
+ p->thread.usp = 0;
+ } else {
+ *childregs = *regs;
+ childregs->r0 = 0;
+ p->thread.usp = usp;
+ v[0] = v[1] = 0;
+ }
- p->thread.usp = usp;
- p->thread.ksp = (unsigned long)childregs;
+ p->thread.ksp = (unsigned long)v;
p->thread.pc = (unsigned long)ret_from_fork;
return 0;
}
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *name,
- const char __user *const __user *argv,
- const char __user *const __user *envp)
-{
- int error;
- struct filename *filename;
- struct pt_regs *regs = (struct pt_regs *)((&name) + 6);
-
- filename = getname(name);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- return error;
- error = do_execve(filename->name, argv, envp, regs);
- putname(filename);
- return error;
-}
-
unsigned long get_wchan(struct task_struct *p)
{
unsigned long fp, pc;
jump .Lsyscall_really_exit;
ENDPROC(_trap)
-ENTRY(_kernel_execve)
- link SIZEOF_PTREGS;
- p0 = sp;
- r3 = SIZEOF_PTREGS / 4;
- r4 = 0(x);
-.Lclear_regs:
- [p0++] = r4;
- r3 += -1;
- cc = r3 == 0;
- if !cc jump .Lclear_regs (bp);
-
- p0 = sp;
- sp += -16;
- [sp + 12] = p0;
- pseudo_long_call _do_execve, p5;
- SP += 16;
- cc = r0 == 0;
- if ! cc jump .Lexecve_failed;
- /* Success. Copy our temporary pt_regs to the top of the kernel
- * stack and do a normal exception return.
- */
- r1 = sp;
- r0 = (-KERNEL_STACK_SIZE) (x);
- r1 = r1 & r0;
- p2 = r1;
- p3 = [p2];
- r0 = KERNEL_STACK_SIZE - 4 (z);
- p1 = r0;
- p1 = p1 + p2;
-
- p0 = fp;
- r4 = [p0--];
- r3 = SIZEOF_PTREGS / 4;
-.Lcopy_regs:
- r4 = [p0--];
- [p1--] = r4;
- r3 += -1;
- cc = r3 == 0;
- if ! cc jump .Lcopy_regs (bp);
-
- r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
- p1 = r0;
- p1 = p1 + p2;
- sp = p1;
- r0 = syscfg;
- [SP + PT_SYSCFG] = r0;
- [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
-
- RESTORE_CONTEXT;
- rti;
-.Lexecve_failed:
- unlink;
- rts;
-ENDPROC(_kernel_execve)
-
ENTRY(_system_call)
/* Store IPEND */
p2.l = lo(IPEND);
select OF_EARLY_FLATTREE
select GENERIC_CLOCKEVENTS
select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
select MODULES_USE_ELF_RELA
config MMU
* more details.
*/
-#define __ARCH_WANT_KERNEL_EXECVE
#define __ARCH_WANT_SYS_EXECVE
/* Use the standard ABI for syscalls. */
0:
B .S2 B10 /* call fn */
LDW .D2T1 *+SP(REGS_A1+8),A4 /* get arg */
- MVKL .S2 sys_exit,B11
- MVKH .S2 sys_exit,B11
- ADDKPC .S2 0f,B3,1
-0:
- BNOP .S2 B11,5 /* jump to sys_exit */
+ ADDKPC .S2 ret_from_fork_2,B3,3
ENDPROC(ret_from_kernel_thread)
-ENTRY(ret_from_kernel_execve)
- GET_THREAD_INFO A12
- BNOP .S2 syscall_exit,4
- ADD .D2X A4,-8,SP
-ENDPROC(ret_from_kernel_execve)
-
;;
;; These are the interrupt handlers, responsible for calling __do_IRQ()
;; int6 is used for syscalls (see _system_call entry)
select GENERIC_SMP_IDLE_THREAD if ETRAX_ARCH_V32
select GENERIC_CMOS_UPDATE
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
config HZ
int
.globl system_call
.globl ret_from_intr
.globl ret_from_fork
+ .globl ret_from_kernel_thread
.globl resume
.globl multiple_interrupt
.globl hwbreakpoint
jsr schedule_tail
ba ret_from_sys_call
nop
-
+
+ret_from_kernel_thread:
+ jsr schedule_tail
+ move.d $r2, $r10 ; argument is here
+ jsr $r1 ; call the payload
+ moveq 0, $r9 ; no syscall restarts, TYVM...
+ ba ret_from_sys_call
+
ret_from_intr:
;; check for resched if preemptive kernel or if we're going back to user-mode
;; this test matches the user_regs(regs) macro
ba do_sigtrap ; SIGTRAP the offending process.
pop $dccr ; Restore dccr in delay slot.
- .global kernel_execve
-kernel_execve:
- move.d __NR_execve, $r9
- break 13
- ret
- nop
-
.data
hw_bp_trigs:
#include <arch/svinto.h>
#include <linux/init.h>
#include <arch/system.h>
+#include <asm/ptrace.h>
#ifdef CONFIG_ETRAX_GPIO
void etrax_gpio_wake_up_check(void); /* drivers/gpio.c */
return task_pt_regs(t)->irp;
}
-static void kernel_thread_helper(void* dummy, int (*fn)(void *), void * arg)
-{
- fn(arg);
- do_exit(-1); /* Should never be called, return bad exit value */
-}
-
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- /* Don't use r10 since that is set to 0 in copy_thread */
- regs.r11 = (unsigned long)fn;
- regs.r12 = (unsigned long)arg;
- regs.irp = (unsigned long)kernel_thread_helper;
- regs.dccr = 1 << I_DCCR_BITNR;
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
-}
-
/* setup the child's kernel stack with a pt_regs and switch_stack on it.
* it will be un-nested during _resume and _ret_from_sys_call when the
* new thread is scheduled.
*
*/
asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
- struct pt_regs * childregs;
- struct switch_stack *swstack;
+ struct pt_regs *childregs = task_pt_regs(p);
+ struct switch_stack *swstack = ((struct switch_stack *)childregs) - 1;
/* put the pt_regs structure at the end of the new kernel stack page and fix it up
* remember that the task_struct doubles as the kernel stack for the task
*/
- childregs = task_pt_regs(p);
-
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(swstack, 0,
+ sizeof(struct switch_stack) + sizeof(struct pt_regs));
+ swstack->r1 = usp;
+ swstack->r2 = arg;
+ childregs->dccr = 1 << I_DCCR_BITNR;
+ swstack->return_ip = (unsigned long) ret_from_kernel_thread;
+ p->thread.ksp = (unsigned long) swstack;
+ p->thread.usp = 0;
+ return 0;
+ }
*childregs = *regs; /* struct copy of pt_regs */
-
- p->set_child_tid = p->clear_child_tid = NULL;
childregs->r10 = 0; /* child returns 0 after a fork/clone */
-
- /* put the switch stack right below the pt_regs */
- swstack = ((struct switch_stack *)childregs) - 1;
+ /* put the switch stack right below the pt_regs */
swstack->r9 = 0; /* parameter to ret_from_sys_call, 0 == dont restart the syscall */
/* fix the user-mode stackpointer */
- p->thread.usp = usp;
+ p->thread.usp = usp;
/* and the kernel-mode one */
return 0;
}
-/*
- * Be aware of the "magic" 7th argument in the four system-calls below.
- * They need the latest stackframe, which is put as the 7th argument by
- * entry.S. The previous arguments are dummies or actually used, but need
- * to be defined to reach the 7th argument.
- *
- * N.B.: Another method to get the stackframe is to use current_regs(). But
- * it returns the latest stack-frame stacked when going from _user mode_ and
- * some of these (at least sys_clone) are called from kernel-mode sometimes
- * (for example during kernel_thread, above) and thus cannot use it. Thus,
- * to be sure not to get any surprises, we use the method for the other calls
- * as well.
- */
-
-asmlinkage int sys_fork(long r10, long r11, long r12, long r13, long mof, long srp,
- struct pt_regs *regs)
+asmlinkage int sys_fork(void)
{
- return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
+ return do_fork(SIGCHLD, rdusp(), current_pt_regs(), 0, NULL, NULL);
}
/* if newusp is 0, we just grab the old usp */
/* FIXME: Is parent_tid/child_tid really third/fourth argument? Update lib? */
asmlinkage int sys_clone(unsigned long newusp, unsigned long flags,
- int* parent_tid, int* child_tid, long mof, long srp,
- struct pt_regs *regs)
+ int* parent_tid, int* child_tid)
{
if (!newusp)
newusp = rdusp();
- return do_fork(flags, newusp, regs, 0, parent_tid, child_tid);
+ return do_fork(flags, newusp, current_pt_regs(), 0, parent_tid, child_tid);
}
/* vfork is a system call in i386 because of register-pressure - maybe
* we can remove it and handle it in libc but we put it here until then.
*/
-asmlinkage int sys_vfork(long r10, long r11, long r12, long r13, long mof, long srp,
- struct pt_regs *regs)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char *fname,
- const char *const *argv,
- const char *const *envp,
- long r13, long mof, long srp,
- struct pt_regs *regs)
+asmlinkage int sys_vfork(void)
{
- int error;
- struct filename *filename;
-
- filename = getname(fname);
- error = PTR_ERR(filename);
-
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename->name, argv, envp, regs);
- putname(filename);
- out:
- return error;
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), current_pt_regs(), 0, NULL, NULL);
}
unsigned long get_wchan(struct task_struct *p)
.globl system_call
.globl ret_from_intr
.globl ret_from_fork
+ .globl ret_from_kernel_thread
.globl resume
.globl multiple_interrupt
.globl nmi_interrupt
nop
.size ret_from_fork, . - ret_from_fork
+ .type ret_from_kernel_thread,@function
+ret_from_kernel_thread:
+ jsr schedule_tail
+ nop
+ move.d $r2, $r10
+ jsr $r1
+ nop
+ moveq 0, $r9 ; no syscall restarts, TYVM...
+ ba ret_from_sys_call
+ nop
+ .size ret_from_kernel_thread, . - ret_from_kernel_thread
+
.type ret_from_intr,@function
ret_from_intr:
;; Check for resched if preemptive kernel, or if we're going back to
ba do_sigtrap ; SIGTRAP the offending process.
move.d [$sp+], $r0 ; Restore R0 in delay slot.
- .global kernel_execve
- .type kernel_execve,@function
-kernel_execve:
- move.d __NR_execve, $r9
- break 13
- ret
- nop
- .size kernel_execve, . - kernel_execve
-
.data
.section .rodata,"a"
#include <hwregs/reg_map.h>
#include <hwregs/timer_defs.h>
#include <hwregs/intr_vect_defs.h>
+#include <asm/ptrace.h>
extern void stop_watchdog(void);
return task_pt_regs(t)->erp;
}
-static void
-kernel_thread_helper(void* dummy, int (*fn)(void *), void * arg)
-{
- fn(arg);
- do_exit(-1); /* Should never be called, return bad exit value. */
-}
-
-/* Create a kernel thread. */
-int
-kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- /* Don't use r10 since that is set to 0 in copy_thread. */
- regs.r11 = (unsigned long) fn;
- regs.r12 = (unsigned long) arg;
- regs.erp = (unsigned long) kernel_thread_helper;
- regs.ccs = 1 << (I_CCS_BITNR + CCS_SHIFT);
-
- /* Create the new process. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
-}
-
/*
* Setup the child's kernel stack with a pt_regs and call switch_stack() on it.
* It will be unnested during _resume and _ret_from_sys_call when the new thread
*/
extern asmlinkage void ret_from_fork(void);
+extern asmlinkage void ret_from_kernel_thread(void);
int
copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
- struct pt_regs *childregs;
- struct switch_stack *swstack;
+ struct pt_regs *childregs = task_pt_regs(p);
+ struct switch_stack *swstack = ((struct switch_stack *) childregs) - 1;
/*
* Put the pt_regs structure at the end of the new kernel stack page and
* fix it up. Note: the task_struct doubles as the kernel stack for the
* task.
*/
- childregs = task_pt_regs(p);
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(swstack, 0,
+ sizeof(struct switch_stack) + sizeof(struct pt_regs));
+ swstack->r1 = usp;
+ swstack->r2 = arg;
+ childregs->ccs = 1 << (I_CCS_BITNR + CCS_SHIFT);
+ swstack->return_ip = (unsigned long) ret_from_kernel_thread;
+ p->thread.ksp = (unsigned long) swstack;
+ p->thread.usp = 0;
+ return 0;
+ }
*childregs = *regs; /* Struct copy of pt_regs. */
- p->set_child_tid = p->clear_child_tid = NULL;
childregs->r10 = 0; /* Child returns 0 after a fork/clone. */
/* Set a new TLS ?
}
/* Put the switch stack right below the pt_regs. */
- swstack = ((struct switch_stack *) childregs) - 1;
/* Parameter to ret_from_sys_call. 0 is don't restart the syscall. */
swstack->r9 = 0;
return 0;
}
-/*
- * Be aware of the "magic" 7th argument in the four system-calls below.
- * They need the latest stackframe, which is put as the 7th argument by
- * entry.S. The previous arguments are dummies or actually used, but need
- * to be defined to reach the 7th argument.
- *
- * N.B.: Another method to get the stackframe is to use current_regs(). But
- * it returns the latest stack-frame stacked when going from _user mode_ and
- * some of these (at least sys_clone) are called from kernel-mode sometimes
- * (for example during kernel_thread, above) and thus cannot use it. Thus,
- * to be sure not to get any surprises, we use the method for the other calls
- * as well.
- */
asmlinkage int
-sys_fork(long r10, long r11, long r12, long r13, long mof, long srp,
- struct pt_regs *regs)
+sys_fork(void)
{
- return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
+ return do_fork(SIGCHLD, rdusp(), current_pt_regs(), 0, NULL, NULL);
}
/* FIXME: Is parent_tid/child_tid really third/fourth argument? Update lib? */
asmlinkage int
sys_clone(unsigned long newusp, unsigned long flags, int *parent_tid, int *child_tid,
- unsigned long tls, long srp, struct pt_regs *regs)
+ unsigned long tls)
{
if (!newusp)
newusp = rdusp();
- return do_fork(flags, newusp, regs, 0, parent_tid, child_tid);
+ return do_fork(flags, newusp, current_pt_regs(), 0, parent_tid, child_tid);
}
/*
* we can remove it and handle it in libc but we put it here until then.
*/
asmlinkage int
-sys_vfork(long r10, long r11, long r12, long r13, long mof, long srp,
- struct pt_regs *regs)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
-}
-
-/* sys_execve() executes a new program. */
-asmlinkage int
-sys_execve(const char *fname,
- const char *const *argv,
- const char *const *envp, long r13, long mof, long srp,
- struct pt_regs *regs)
+sys_vfork(void)
{
- int error;
- struct filename *filename;
-
- filename = getname(fname);
- error = PTR_ERR(filename);
-
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename->name, argv, envp, regs);
- putname(filename);
- out:
- return error;
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), current_pt_regs(), 0, NULL, NULL);
}
unsigned long
#define task_pt_regs(task) user_regs(task_thread_info(task))
#define current_regs() task_pt_regs(current)
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
unsigned long get_wchan(struct task_struct *p);
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls
extern void iounmap(volatile void * __iomem);
/* Platform dependent support */
-EXPORT_SYMBOL(kernel_thread);
EXPORT_SYMBOL(get_cmos_time);
EXPORT_SYMBOL(loops_per_usec);
select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
config SYMBOL_PREFIX
string
{
}
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
/*
* Free current thread data structures etc..
*/
#define user_mode(regs) (!((regs)->ccr & PS_S))
#define instruction_pointer(regs) ((regs)->pc)
#define profile_pc(regs) instruction_pointer(regs)
+#define current_pt_regs() ((struct pt_regs *) \
+ (THREAD_SIZE + (unsigned long)current_thread_info()) - 1)
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _H8300_PTRACE_H */
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls
.globl SYMBOL_NAME(system_call)
.globl SYMBOL_NAME(ret_from_exception)
.globl SYMBOL_NAME(ret_from_fork)
+.globl SYMBOL_NAME(ret_from_kernel_thread)
.globl SYMBOL_NAME(ret_from_interrupt)
.globl SYMBOL_NAME(interrupt_redirect_table)
.globl SYMBOL_NAME(sw_ksp),SYMBOL_NAME(sw_usp)
jsr @SYMBOL_NAME(schedule_tail)
jmp @SYMBOL_NAME(ret_from_exception)
+SYMBOL_NAME_LABEL(ret_from_kernel_thread)
+ mov.l er2,er0
+ jsr @SYMBOL_NAME(schedule_tail)
+ mov.l @(LER4:16,sp),er0
+ mov.l @(LER5:16,sp),er1
+ jsr @er1
+ jmp @SYMBOL_NAME(ret_from_exception)
+
SYMBOL_NAME_LABEL(resume)
/*
* Beware - when entering resume, offset of tss is in d1,
EXPORT_SYMBOL(ip_fast_csum);
-EXPORT_SYMBOL(kernel_thread);
EXPORT_SYMBOL(enable_irq);
EXPORT_SYMBOL(disable_irq);
EXPORT_SYMBOL(pm_power_off);
asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
/*
* The idle loop on an H8/300..
printk("\n");
}
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- long retval;
- long clone_arg;
- mm_segment_t fs;
-
- fs = get_fs();
- set_fs (KERNEL_DS);
- clone_arg = flags | CLONE_VM;
- __asm__("mov.l sp,er3\n\t"
- "sub.l er2,er2\n\t"
- "mov.l %2,er1\n\t"
- "mov.l %1,er0\n\t"
- "trapa #0\n\t"
- "cmp.l sp,er3\n\t"
- "beq 1f\n\t"
- "mov.l %4,er0\n\t"
- "mov.l %3,er1\n\t"
- "jsr @er1\n\t"
- "mov.l %5,er0\n\t"
- "trapa #0\n"
- "1:\n\t"
- "mov.l er0,%0"
- :"=r"(retval)
- :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
- :"er0","er1","er2","er3");
- set_fs (fs);
- return retval;
-}
-
void flush_thread(void)
{
}
childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->retpc = (unsigned long) ret_from_kernel_thread;
+ childregs->er4 = topstk; /* arg */
+ childregs->er5 = usp; /* fn */
+ p->thread.ksp = (unsigned long)childregs;
+ }
*childregs = *regs;
childregs->retpc = (unsigned long) ret_from_fork;
childregs->er0 = 0;
return 0;
}
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char *name,
- const char *const *argv,
- const char *const *envp,
- int dummy, ...)
-{
- int error;
- struct filename *filename;
- struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
-
- filename = getname(name);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- return error;
- error = do_execve(filename->name, argv, envp, regs);
- putname(filename);
- return error;
-}
-
unsigned long thread_saved_pc(struct task_struct *tsk)
{
return ((struct pt_regs *)tsk->thread.esp0)->pc;
((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
}
#endif
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-asmlinkage
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- register long res __asm__("er0");
- register const char *const *_c __asm__("er3") = envp;
- register const char *const *_b __asm__("er2") = argv;
- register const char * _a __asm__("er1") = filename;
- __asm__ __volatile__ ("mov.l %1,er0\n\t"
- "trapa #0\n\t"
- : "=r" (res)
- : "g" (__NR_execve),
- "g" (_a),
- "g" (_b),
- "g" (_c)
- : "cc", "memory");
- return res;
-}
-
-
select GENERIC_CLOCKEVENTS
select GENERIC_CLOCKEVENTS_BROADCAST
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
---help---
Qualcomm Hexagon is a processor architecture designed for high
performance and low power across a wide variety of applications.
struct task_struct;
/* this is defined in arch/process.c */
-extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *tsk);
extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset);
+#define current_pt_regs() \
+ ((struct pt_regs *) \
+ ((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
+
#endif
*/
#define sys_mmap2 sys_mmap_pgoff
+#define __ARCH_WANT_SYS_EXECVE
#include <asm-generic/unistd.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
-/*
- * Kernel thread creation. The desired kernel function is "wrapped"
- * in the kernel_thread_helper function, which does cleanup
- * afterwards.
- */
-static void __noreturn kernel_thread_helper(void *arg, int (*fn)(void *))
-{
- do_exit(fn(arg));
-}
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
- /*
- * Yes, we're exploting illicit knowledge of the ABI here.
- */
- regs.r00 = (unsigned long) arg;
- regs.r01 = (unsigned long) fn;
- pt_set_elr(®s, (unsigned long)kernel_thread_helper);
- pt_set_kmode(®s);
-
- return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Program thread launch. Often defined as a macro in processor.h,
* but we're shooting for a small footprint and it's not an inner-loop
* Copy architecture-specific thread state
*/
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused, struct task_struct *p,
+ unsigned long arg, struct task_struct *p,
struct pt_regs *regs)
{
struct thread_info *ti = task_thread_info(p);
childregs = (struct pt_regs *) (((unsigned long) ti + THREAD_SIZE) -
sizeof(*childregs));
- memcpy(childregs, regs, sizeof(*childregs));
ti->regs = childregs;
/*
* Establish kernel stack pointer and initial PC for new thread
+ * Note that unlike the usual situation, we do not copy the
+ * parent's callee-saved here; those are in pt_regs and whatever
+ * we leave here will be overridden on return to userland.
*/
ss = (struct hexagon_switch_stack *) ((unsigned long) childregs -
sizeof(*ss));
ss->lr = (unsigned long)ret_from_fork;
p->thread.switch_sp = ss;
-
- /* If User mode thread, set pt_reg stack pointer as per parameter */
- if (user_mode(childregs)) {
- pt_set_rte_sp(childregs, usp);
-
- /* Child sees zero return value */
- childregs->r00 = 0;
-
- /*
- * The clone syscall has the C signature:
- * int [r0] clone(int flags [r0],
- * void *child_frame [r1],
- * void *parent_tid [r2],
- * void *child_tid [r3],
- * void *thread_control_block [r4]);
- * ugp is used to provide TLS support.
- */
- if (clone_flags & CLONE_SETTLS)
- childregs->ugp = childregs->r04;
-
- /*
- * Parent sees new pid -- not necessary, not even possible at
- * this point in the fork process
- * Might also want to set things like ti->addr_limit
- */
- } else {
- /*
- * If kernel thread, resume stack is kernel stack base.
- * Note that this is pointer arithmetic on pt_regs *
- */
- pt_set_rte_sp(childregs, (unsigned long)(childregs + 1));
- /*
- * We need the current thread_info fast path pointer
- * set up in pt_regs. The register to be used is
- * parametric for assembler code, but the mechanism
- * doesn't drop neatly into C. Needs to be fixed.
- */
- childregs->THREADINFO_REG = (unsigned long) ti;
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ /* r24 <- fn, r25 <- arg */
+ ss->r2524 = usp | ((u64)arg << 32);
+ pt_set_kmode(childregs);
+ return 0;
}
+ memcpy(childregs, regs, sizeof(*childregs));
+ ss->r2524 = 0;
+
+ pt_set_rte_sp(childregs, usp);
+
+ /* Child sees zero return value */
+ childregs->r00 = 0;
+
+ /*
+ * The clone syscall has the C signature:
+ * int [r0] clone(int flags [r0],
+ * void *child_frame [r1],
+ * void *parent_tid [r2],
+ * void *child_tid [r3],
+ * void *thread_control_block [r4]);
+ * ugp is used to provide TLS support.
+ */
+ if (clone_flags & CLONE_SETTLS)
+ childregs->ugp = childregs->r04;
/*
- * thread_info pointer is pulled out of task_struct "stack"
- * field on switch_to.
+ * Parent sees new pid -- not necessary, not even possible at
+ * this point in the fork process
+ * Might also want to set things like ti->addr_limit
*/
- p->stack = (void *)ti;
return 0;
}
*/
asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
{
- struct pt_regs *regs = current_thread_info()->regs;
+ struct pt_regs *regs = current_pt_regs();
return do_sigaltstack(uss, uoss, regs->r29);
}
asmlinkage int sys_rt_sigreturn(void)
{
- struct pt_regs *regs = current_thread_info()->regs;
+ struct pt_regs *regs = current_pt_regs();
struct rt_sigframe __user *frame;
sigset_t blocked;
* See signal.c for signal-related system call wrappers.
*/
-asmlinkage int sys_execve(char __user *ufilename,
- const char __user *const __user *argv,
- const char __user *const __user *envp)
-{
- struct pt_regs *pregs = current_thread_info()->regs;
- struct filename *filename;
- int retval;
-
- filename = getname(ufilename);
- retval = PTR_ERR(filename);
- if (IS_ERR(filename))
- return retval;
-
- retval = do_execve(filename->name, argv, envp, pregs);
- putname(filename);
-
- return retval;
-}
-
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
unsigned long parent_tidp, unsigned long child_tidp)
{
- struct pt_regs *pregs = current_thread_info()->regs;
+ struct pt_regs *pregs = current_pt_regs();
if (!newsp)
newsp = pregs->SP;
return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp,
(int __user *)child_tidp);
}
-
-/*
- * Do a system call from the kernel, so as to have a proper pt_regs
- * and recycle the sys_execvpe infrustructure.
- */
-int kernel_execve(const char *filename,
- const char *const argv[], const char *const envp[])
-{
- register unsigned long __a0 asm("r0") = (unsigned long) filename;
- register unsigned long __a1 asm("r1") = (unsigned long) argv;
- register unsigned long __a2 asm("r2") = (unsigned long) envp;
- int retval;
-
- __asm__ volatile(
- " R6 = #%4;\n"
- " trap0(#1);\n"
- " %0 = R0;\n"
- : "=r" (retval)
- : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
- );
-
- return retval;
-}
.globl ret_from_fork
ret_from_fork:
call schedule_tail
+ P0 = cmp.eq(R24, #0);
+ if P0 jump return_from_syscall
+ R0 = R25;
+ callr R24
jump return_from_syscall
select GENERIC_TIME_VSYSCALL_OLD
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
*/
#define release_thread(dead_task)
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE 1: Only a kernel-only process (ie the swapper or direct
- * descendants who haven't done an "execve()") should use this: it
- * will work within a system call from a "real" process, but the
- * process memory space will not be free'd until both the parent and
- * the child have exited.
- *
- * NOTE 2: This MUST NOT be an inlined function. Otherwise, we get
- * into trouble in init/main.c when the child thread returns to
- * do_basic_setup() and the timing is such that free_initmem() has
- * been called already.
- */
-extern pid_t kernel_thread (int (*fn)(void *), void *arg, unsigned long flags);
-
/* Get wait channel for task P. */
extern unsigned long get_wchan (struct task_struct *p);
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
#if !defined(__ASSEMBLY__) && !defined(ASSEMBLER)
* Allocate 8 input registers since ptrace() may clobber them
*/
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
- alloc loc1=ar.pfs,8,2,4,0
+ alloc loc1=ar.pfs,8,2,3,0
mov loc0=rp
.body
mov out0=in0 // filename
;; // stop bit between alloc and call
mov out1=in1 // argv
mov out2=in2 // envp
- add out3=16,sp // regs
br.call.sptk.many rp=sys_execve
.ret0:
cmp4.ge p6,p7=r8,r0
sxt4 r8=r8 // return 64-bit result
;;
stf.spill [sp]=f0
-(p6) cmp.ne pKStk,pUStk=r0,r0 // a successful execve() lands us in user-mode...
mov rp=loc0
(p6) mov ar.pfs=r0 // clear ar.pfs on success
(p7) br.ret.sptk.many rp
br.ret.sptk.many rp
END(prefetch_stack)
-GLOBAL_ENTRY(kernel_execve)
- rum psr.ac
- mov r15=__NR_execve // put syscall number in place
- break __BREAK_SYSCALL
- br.ret.sptk.many rp
-END(kernel_execve)
-
-GLOBAL_ENTRY(clone)
- mov r15=__NR_clone // put syscall number in place
- break __BREAK_SYSCALL
- br.ret.sptk.many rp
-END(clone)
-
/*
* Invoke a system call, but do some tracing before and after the call.
* We MUST preserve the current register frame throughout this routine
.ret4: br.cond.sptk ia64_leave_kernel
END(ia64_strace_leave_kernel)
+ENTRY(call_payload)
+ .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(0)
+ /* call the kernel_thread payload; fn is in r4, arg - in r5 */
+ alloc loc1=ar.pfs,0,3,1,0
+ mov loc0=rp
+ mov loc2=gp
+ mov out0=r5 // arg
+ ld8 r14 = [r4], 8 // fn.address
+ ;;
+ mov b6 = r14
+ ld8 gp = [r4] // fn.gp
+ ;;
+ br.call.sptk.many rp=b6 // fn(arg)
+.ret12: mov gp=loc2
+ mov rp=loc0
+ mov ar.pfs=loc1
+ /* ... and if it has returned, we are going to userland */
+ cmp.ne pKStk,pUStk=r0,r0
+ br.ret.sptk.many rp
+END(call_payload)
+
GLOBAL_ENTRY(ia64_ret_from_clone)
PT_REGS_UNWIND_INFO(0)
{ /*
br.call.sptk.many rp=ia64_invoke_schedule_tail
}
.ret8:
+(pKStk) br.call.sptk.many rp=call_payload
adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
;;
ld4 r2=[r2]
END(cycle_to_cputime)
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
-GLOBAL_ENTRY(start_kernel_thread)
- .prologue
- .save rp, r0 // this is the end of the call-chain
- .body
- alloc r2 = ar.pfs, 0, 0, 2, 0
- mov out0 = r9
- mov out1 = r11;;
- br.call.sptk.many rp = kernel_thread_helper;;
- mov out0 = r8
- br.call.sptk.many rp = sys_exit;;
-1: br.sptk.few 1b // not reached
-END(start_kernel_thread)
-
#ifdef CONFIG_IA64_BRL_EMU
/*
struct pt_regs *child_ptregs;
int retval = 0;
-#ifdef CONFIG_SMP
- /*
- * For SMP idle threads, fork_by_hand() calls do_fork with
- * NULL regs.
- */
- if (!regs)
- return 0;
-#endif
-
- stack = ((struct switch_stack *) regs) - 1;
-
child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
child_stack = (struct switch_stack *) child_ptregs - 1;
- /* copy parent's switch_stack & pt_regs to child: */
- memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
-
rbs = (unsigned long) current + IA64_RBS_OFFSET;
child_rbs = (unsigned long) p + IA64_RBS_OFFSET;
- rbs_size = stack->ar_bspstore - rbs;
-
- /* copy the parent's register backing store to the child: */
- memcpy((void *) child_rbs, (void *) rbs, rbs_size);
-
- if (likely(user_mode(child_ptregs))) {
- if (clone_flags & CLONE_SETTLS)
- child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */
- if (user_stack_base) {
- child_ptregs->r12 = user_stack_base + user_stack_size - 16;
- child_ptregs->ar_bspstore = user_stack_base;
- child_ptregs->ar_rnat = 0;
- child_ptregs->loadrs = 0;
- }
- } else {
- /*
- * Note: we simply preserve the relative position of
- * the stack pointer here. There is no need to
- * allocate a scratch area here, since that will have
- * been taken care of by the caller of sys_clone()
- * already.
- */
- child_ptregs->r12 = (unsigned long) child_ptregs - 16; /* kernel sp */
- child_ptregs->r13 = (unsigned long) p; /* set `current' pointer */
- }
- child_stack->ar_bspstore = child_rbs + rbs_size;
- child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
/* copy parts of thread_struct: */
p->thread.ksp = (unsigned long) child_stack - 16;
- /* stop some PSR bits from being inherited.
- * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
- * therefore we must specify them explicitly here and not include them in
- * IA64_PSR_BITS_TO_CLEAR.
- */
- child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
- & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
-
/*
* NOTE: The calling convention considers all floating point
* registers in the high partition (fph) to be scratch. Since
# define THREAD_FLAGS_TO_SET 0
p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR)
| THREAD_FLAGS_TO_SET);
+
ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ if (unlikely(!user_stack_base)) {
+ /* fork_idle() called us */
+ return 0;
+ }
+ memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack));
+ child_stack->r4 = user_stack_base; /* payload */
+ child_stack->r5 = user_stack_size; /* argument */
+ /*
+ * Preserve PSR bits, except for bits 32-34 and 37-45,
+ * which we can't read.
+ */
+ child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
+ /* mark as valid, empty frame */
+ child_ptregs->cr_ifs = 1UL << 63;
+ child_stack->ar_fpsr = child_ptregs->ar_fpsr
+ = ia64_getreg(_IA64_REG_AR_FPSR);
+ child_stack->pr = (1 << PRED_KERNEL_STACK);
+ child_stack->ar_bspstore = child_rbs;
+ child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
+
+ /* stop some PSR bits from being inherited.
+ * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
+ * therefore we must specify them explicitly here and not include them in
+ * IA64_PSR_BITS_TO_CLEAR.
+ */
+ child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
+ & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
+
+ return 0;
+ }
+ stack = ((struct switch_stack *) regs) - 1;
+ /* copy parent's switch_stack & pt_regs to child: */
+ memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
+
+ /* copy the parent's register backing store to the child: */
+ rbs_size = stack->ar_bspstore - rbs;
+ memcpy((void *) child_rbs, (void *) rbs, rbs_size);
+ if (clone_flags & CLONE_SETTLS)
+ child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */
+ if (user_stack_base) {
+ child_ptregs->r12 = user_stack_base + user_stack_size - 16;
+ child_ptregs->ar_bspstore = user_stack_base;
+ child_ptregs->ar_rnat = 0;
+ child_ptregs->loadrs = 0;
+ }
+ child_stack->ar_bspstore = child_rbs + rbs_size;
+ child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
+
+ /* stop some PSR bits from being inherited.
+ * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
+ * therefore we must specify them explicitly here and not include them in
+ * IA64_PSR_BITS_TO_CLEAR.
+ */
+ child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
+ & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
+
#ifdef CONFIG_PERFMON
if (current->thread.pfm_context)
pfm_inherit(p, child_ptregs);
return 1; /* f0-f31 are always valid so we always return 1 */
}
-long
-sys_execve (const char __user *filename,
- const char __user *const __user *argv,
- const char __user *const __user *envp,
- struct pt_regs *regs)
-{
- struct filename *fname;
- int error;
-
- fname = getname(filename);
- error = PTR_ERR(fname);
- if (IS_ERR(fname))
- goto out;
- error = do_execve(fname->name, argv, envp, regs);
- putname(fname);
-out:
- return error;
-}
-
-pid_t
-kernel_thread (int (*fn)(void *), void *arg, unsigned long flags)
-{
- extern void start_kernel_thread (void);
- unsigned long *helper_fptr = (unsigned long *) &start_kernel_thread;
- struct {
- struct switch_stack sw;
- struct pt_regs pt;
- } regs;
-
- memset(®s, 0, sizeof(regs));
- regs.pt.cr_iip = helper_fptr[0]; /* set entry point (IP) */
- regs.pt.r1 = helper_fptr[1]; /* set GP */
- regs.pt.r9 = (unsigned long) fn; /* 1st argument */
- regs.pt.r11 = (unsigned long) arg; /* 2nd argument */
- /* Preserve PSR bits, except for bits 32-34 and 37-45, which we can't read. */
- regs.pt.cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
- regs.pt.cr_ifs = 1UL << 63; /* mark as valid, empty frame */
- regs.sw.ar_fpsr = regs.pt.ar_fpsr = ia64_getreg(_IA64_REG_AR_FPSR);
- regs.sw.ar_bspstore = (unsigned long) current + IA64_RBS_OFFSET;
- regs.sw.pr = (1 << PRED_KERNEL_STACK);
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s.pt, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
-/* This gets called from kernel_thread() via ia64_invoke_thread_helper(). */
-int
-kernel_thread_helper (int (*fn)(void *), void *arg)
-{
- return (*fn)(arg);
-}
-
/*
* Flush thread state. This is called when a thread does an execve().
*/
select GENERIC_ATOMIC64
select ARCH_USES_GETTIMEOFFSET
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
config SBUS
bool
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
-/*
- * create a kernel thread without removing it from tasklists
- */
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
/* Copy and release all segment info associated with a VM */
extern void copy_segments(struct task_struct *p, struct mm_struct * mm);
extern void release_segments(struct mm_struct * mm);
#define task_pt_regs(task) \
((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE) - 1)
+#define current_pt_regs() ((struct pt_regs *) \
+ ((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
#endif /* __KERNEL */
#define __ARCH_WANT_SYS_OLDUMOUNT
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
#define __IGNORE_lchown
#define __IGNORE_setuid
and \reg, sp
.endm
+ENTRY(ret_from_kernel_thread)
+ pop r0
+ bl schedule_tail
+ GET_THREAD_INFO(r8)
+ ld r0, R0(r8)
+ ld r1, R1(r8)
+ jl r1
+ bra syscall_exit
+
ENTRY(ret_from_fork)
pop r0
bl schedule_tail
#endif
}
-/*
- * Create a kernel thread
- */
-
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be free'd until both the parent and the child have exited.
- */
-static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
-{
- fn(arg);
- do_exit(-1);
-}
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof (regs));
- regs.r1 = (unsigned long)fn;
- regs.r2 = (unsigned long)arg;
-
- regs.bpc = (unsigned long)kernel_thread_helper;
-
- regs.psw = M32R_PSW_BIE;
-
- /* Ok, create the new process. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
- NULL);
-}
-
/*
* Free current thread data structures etc..
*/
}
int copy_thread(unsigned long clone_flags, unsigned long spu,
- unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
+ unsigned long arg, struct task_struct *tsk, struct pt_regs *regs)
{
struct pt_regs *childregs = task_pt_regs(tsk);
extern void ret_from_fork(void);
-
- /* Copy registers */
- *childregs = *regs;
-
- childregs->spu = spu;
- childregs->r0 = 0; /* Child gets zero as return value */
- regs->r0 = tsk->pid;
+ extern void ret_from_kernel_thread(void);
+
+ if (unlikely(tsk->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->psw = M32R_PSW_BIE;
+ childregs->r1 = spu; /* fn */
+ childregs->r0 = arg;
+ tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
+ } else {
+ /* Copy registers */
+ *childregs = *regs;
+ childregs->spu = spu;
+ childregs->r0 = 0; /* Child gets zero as return value */
+ tsk->thread.lr = (unsigned long)ret_from_fork;
+ }
tsk->thread.sp = (unsigned long)childregs;
- tsk->thread.lr = (unsigned long)ret_from_fork;
return 0;
}
-asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
- unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
- struct pt_regs regs)
+asmlinkage int sys_fork(void)
{
#ifdef CONFIG_MMU
- return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL);
+ struct pt_regs *regs = current_pt_regs();
+ return do_fork(SIGCHLD, regs->spu, regs, 0, NULL, NULL);
#else
return -EINVAL;
#endif /* CONFIG_MMU */
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
unsigned long parent_tidptr,
- unsigned long child_tidptr,
- unsigned long r4, unsigned long r5, unsigned long r6,
- struct pt_regs regs)
+ unsigned long child_tidptr)
{
+ struct pt_regs *regs = current_pt_regs();
if (!newsp)
- newsp = regs.spu;
+ newsp = regs->spu;
- return do_fork(clone_flags, newsp, ®s, 0,
+ return do_fork(clone_flags, newsp, regs, 0,
(int __user *)parent_tidptr, (int __user *)child_tidptr);
}
* do not have enough call-clobbered registers to hold all
* the information you need.
*/
-asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
- unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
- struct pt_regs regs)
+asmlinkage int sys_vfork(void)
{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0,
+ struct pt_regs *regs = current_pt_regs();
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->spu, regs, 0,
NULL, NULL);
}
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *ufilename,
- const char __user *const __user *uargv,
- const char __user *const __user *uenvp,
- unsigned long r3, unsigned long r4, unsigned long r5,
- unsigned long r6, struct pt_regs regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname(ufilename);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename->name, uargv, uenvp, ®s);
- putname(filename);
-out:
- return error;
-}
-
/*
* These bracket the sleeping functions..
*/
/* Not implemented yet. */
return -ENOSYS;
}
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- register long __scno __asm__ ("r7") = __NR_execve;
- register long __arg3 __asm__ ("r2") = (long)(envp);
- register long __arg2 __asm__ ("r1") = (long)(argv);
- register long __res __asm__ ("r0") = (long)(filename);
- __asm__ __volatile__ (
- "trap #" SYSCALL_VECTOR "|| nop"
- : "=r" (__res)
- : "r" (__scno), "0" (__res), "r" (__arg2),
- "r" (__arg3)
- : "memory");
- return __res;
-}
select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE
select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_REL
select MODULES_USE_ELF_RELA
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
-#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls
| a3 contains the kernel thread payload, d7 - its argument
movel %d1,%sp@-
jsr schedule_tail
- GET_CURRENT(%d0)
movel %d7,(%sp)
jsr %a3@
addql #4,%sp
- movel %d0,(%sp)
- jra sys_exit
-
-ENTRY(ret_from_kernel_execve)
- movel 4(%sp), %sp
- GET_CURRENT(%d0)
jra ret_from_exception
#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
config SWAP
def_bool n
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
extern void ret_from_fork(void);
+extern void ret_from_kernel_thread(void);
# endif /* __ASSEMBLY__ */
extern unsigned long get_wchan(struct task_struct *p);
-/*
- * create a kernel thread without removing it from tasklists
- */
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
# define KSTK_EIP(tsk) (0)
# define KSTK_ESP(tsk) (0)
{
}
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
/* Free current thread data structures etc. */
static inline void exit_thread(void)
{
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls
brid ret_to_user
nop
+ENTRY(ret_from_kernel_thread)
+ brlid r15, schedule_tail
+ addk r5, r0, r3
+ brald r15, r20
+ addk r5, r0, r19
+ brid ret_to_user
+ addk r3, r0, r0
+
work_pending:
enable_irq
brid microblaze_clone
addk r7, r1, r0
-sys_execve:
- brid microblaze_execve
- addk r8, r1, r0
-
sys_rt_sigreturn_wrapper:
brid sys_rt_sigreturn
addk r5, r1, r0
swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
addi r14, r14, 4 /* return address is 4 byte after call */
- mfs r1, rmsr
- nop
- andi r1, r1, MSR_UMS
- bnei r1, 1f
-
-/* Kernel-mode state save - kernel execve */
- lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/
- tophys(r1,r1);
-
- addik r1, r1, -PT_SIZE; /* Make room on the stack. */
- SAVE_REGS
-
- swi r1, r1, PT_MODE; /* pt_regs -> kernel mode */
- brid 2f;
- nop; /* Fill delay slot */
-
-/* User-mode state save. */
-1:
lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
tophys(r1,r1);
lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */
saved context). */
C_ENTRY(ret_from_fork):
bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
- add r3, r5, r0; /* switch_thread returns the prev task */
+ add r5, r3, r0; /* switch_thread returns the prev task */
/* ( in the delay slot ) */
brid ret_from_trap; /* Do normal trap return */
add r3, r0, r0; /* Child's fork call should return 0. */
+C_ENTRY(ret_from_kernel_thread):
+ bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
+ add r5, r3, r0; /* switch_thread returns the prev task */
+ /* ( in the delay slot ) */
+ brald r15, r20 /* fn was left in r20 */
+ addk r5, r0, r19 /* ... and argument - in r19 */
+ brid ret_from_trap
+ add r3, r0, r0
+
C_ENTRY(sys_vfork):
brid microblaze_vfork /* Do real work (tail-call) */
addik r5, r1, 0
brid do_fork /* Do real work (tail-call) */
add r8, r0, r0; /* Arg 3: (unused) */
-C_ENTRY(sys_execve):
- brid microblaze_execve; /* Do real work (tail-call).*/
- addik r8, r1, 0; /* add user context as 4th arg */
-
C_ENTRY(sys_rt_sigreturn_wrapper):
brid sys_rt_sigreturn /* Do real work */
addik r5, r1, 0; /* add user context as 1st arg */
}
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs = task_pt_regs(p);
struct thread_info *ti = task_thread_info(p);
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ /* if we're creating a new kernel thread then just zeroing all
+ * the registers. That's OK for a brand new thread.*/
+ memset(childregs, 0, sizeof(struct pt_regs));
+ memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
+ ti->cpu_context.r1 = (unsigned long)childregs;
+ ti->cpu_context.r20 = (unsigned long)usp; /* fn */
+ ti->cpu_context.r19 = (unsigned long)arg;
+ childregs->pt_mode = 1;
+ local_save_flags(childregs->msr);
+#ifdef CONFIG_MMU
+ ti->cpu_context.msr = childregs->msr & ~MSR_IE;
+#endif
+ ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
+ return 0;
+ }
*childregs = *regs;
- if (user_mode(regs))
- childregs->r1 = usp;
- else
- childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
+ childregs->r1 = usp;
-#ifndef CONFIG_MMU
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
ti->cpu_context.r1 = (unsigned long)childregs;
+#ifndef CONFIG_MMU
ti->cpu_context.msr = (unsigned long)childregs->msr;
#else
+ childregs->msr |= MSR_UMS;
- /* if creating a kernel thread then update the current reg (we don't
- * want to use the parent's value when restoring by POP_STATE) */
- if (kernel_mode(regs))
- /* save new current on stack to use POP_STATE */
- childregs->CURRENT_TASK = (unsigned long)p;
- /* if returning to user then use the parent's value of this register */
-
- /* if we're creating a new kernel thread then just zeroing all
- * the registers. That's OK for a brand new thread.*/
- /* Pls. note that some of them will be restored in POP_STATE */
- if (kernel_mode(regs))
- memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
- /* if this thread is created for fork/vfork/clone, then we want to
- * restore all the parent's context */
- /* in addition to the registers which will be restored by POP_STATE */
- else {
- ti->cpu_context = *(struct cpu_context *)regs;
- childregs->msr |= MSR_UMS;
- }
-
- /* FIXME STATE_SAVE_PT_OFFSET; */
- ti->cpu_context.r1 = (unsigned long)childregs;
/* we should consider the fact that childregs is a copy of the parent
* regs which were saved immediately after entering the kernel state
* before enabling VM. This MSR will be restored in switch_to and
}
#endif
-static void kernel_thread_helper(int (*fn)(void *), void *arg)
-{
- fn(arg);
- do_exit(-1);
-}
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
- /* store them in non-volatile registers */
- regs.r5 = (unsigned long)fn;
- regs.r6 = (unsigned long)arg;
- local_save_flags(regs.msr);
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.pt_mode = 1;
-
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
- ®s, 0, NULL, NULL);
-}
-EXPORT_SYMBOL_GPL(kernel_thread);
-
unsigned long get_wchan(struct task_struct *p)
{
/* TBD (used by procfs) */
regs->pt_mode = 0;
#ifdef CONFIG_MMU
regs->msr |= MSR_UMS;
+ regs->msr &= ~MSR_VM;
#endif
}
return do_fork(flags, stack, regs, 0, NULL, NULL);
}
-asmlinkage long microblaze_execve(const char __user *filenamei,
- const char __user *const __user *argv,
- const char __user *const __user *envp,
- struct pt_regs *regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname(filenamei);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename->name, argv, envp, regs);
- putname(filename);
-out:
- return error;
-}
-
asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t pgoff)
return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
}
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- register const char *__a __asm__("r5") = filename;
- register const void *__b __asm__("r6") = argv;
- register const void *__c __asm__("r7") = envp;
- register unsigned long __syscall __asm__("r12") = __NR_execve;
- register unsigned long __ret __asm__("r3");
- __asm__ __volatile__ ("brki r14, 0x8"
- : "=r" (__ret), "=r" (__syscall)
- : "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
- : "r4", "r8", "r9",
- "r10", "r11", "r14", "cc", "memory");
- return __ret;
-}
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_REL
select MODULES_USE_ELF_RELA if 64BIT
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
menu "Machine selection"
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
-extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
extern unsigned long thread_saved_pc(struct task_struct *tsk);
/*
die(str, regs);
}
+#define current_pt_regs() \
+({ \
+ unsigned long sp = (unsigned long)__builtin_frame_address(0); \
+ (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
+})
+
#endif /* _ASM_PTRACE_H */
#define __ARCH_OMIT_COMPAT_SYS_GETDENTS64
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_GETHOSTNAME
#define __ARCH_WANT_SYS_IPC
#define __ARCH_WANT_SYS_PAUSE
b need_resched
#endif
+FEXPORT(ret_from_kernel_thread)
+ jal schedule_tail # a0 = struct task_struct *prev
+ move a0, s1
+ jal s0
+ j syscall_exit
+
FEXPORT(ret_from_fork)
jal schedule_tail # a0 = struct task_struct *prev
*
* Copyright (C) 2000 Silicon Graphics, Inc.
* Written by Ulf Carlsson (ulfc@engr.sgi.com)
- * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
*/
#include <linux/compiler.h>
#include <linux/mm.h>
return error;
}
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname(compat_ptr(regs.regs[4]));
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = compat_do_execve(filename->name, compat_ptr(regs.regs[5]),
- compat_ptr(regs.regs[6]), ®s);
- putname(filename);
-
-out:
- return error;
-}
-
#define RLIM_INFINITY32 0x7fffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memmove);
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Functions that operate on entire pages. Mostly used by memory management.
*/
}
asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
{
}
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused, struct task_struct *p, struct pt_regs *regs)
+ unsigned long arg, struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *ti = task_thread_info(p);
struct pt_regs *childregs;
childregs = (struct pt_regs *) childksp - 1;
/* Put the stack after the struct pt_regs. */
childksp = (unsigned long) childregs;
+ p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ unsigned long status = p->thread.cp0_status;
+ memset(childregs, 0, sizeof(struct pt_regs));
+ ti->addr_limit = KERNEL_DS;
+ p->thread.reg16 = usp; /* fn */
+ p->thread.reg17 = arg;
+ p->thread.reg29 = childksp;
+ p->thread.reg31 = (unsigned long) ret_from_kernel_thread;
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+ status = (status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) |
+ ((status & (ST0_KUC | ST0_IEC)) << 2);
+#else
+ status |= ST0_EXL;
+#endif
+ childregs->cp0_status = status;
+ return 0;
+ }
*childregs = *regs;
childregs->regs[7] = 0; /* Clear error flag */
-
childregs->regs[2] = 0; /* Child gets zero as return value */
+ childregs->regs[29] = usp;
+ ti->addr_limit = USER_DS;
- if (childregs->cp0_status & ST0_CU0) {
- childregs->regs[28] = (unsigned long) ti;
- childregs->regs[29] = childksp;
- ti->addr_limit = KERNEL_DS;
- } else {
- childregs->regs[29] = usp;
- ti->addr_limit = USER_DS;
- }
p->thread.reg29 = (unsigned long) childregs;
p->thread.reg31 = (unsigned long) ret_from_fork;
* New tasks lose permission to use the fpu. This accelerates context
* switching for most programs since they don't use the fpu.
*/
- p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
#ifdef CONFIG_MIPS_MT_SMTC
return 1;
}
-/*
- * Create a kernel thread
- */
-static void __noreturn kernel_thread_helper(void *arg, int (*fn)(void *))
-{
- do_exit(fn(arg));
-}
-
-long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- regs.regs[4] = (unsigned long) arg;
- regs.regs[5] = (unsigned long) fn;
- regs.cp0_epc = (unsigned long) kernel_thread_helper;
- regs.cp0_status = read_c0_status();
-#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
- regs.cp0_status = (regs.cp0_status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) |
- ((regs.cp0_status & (ST0_KUC | ST0_IEC)) << 2);
-#else
- regs.cp0_status |= ST0_EXL;
-#endif
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
-}
-
/*
*
*/
PTR sys_getsockopt
PTR sys_clone /* 6055 */
PTR sys_fork
- PTR sys32_execve
+ PTR compat_sys_execve
PTR sys_exit
PTR compat_sys_wait4
PTR sys_kill /* 6060 */
PTR sys_creat
PTR sys_link
PTR sys_unlink /* 4010 */
- PTR sys32_execve
+ PTR compat_sys_execve
PTR sys_chdir
PTR compat_sys_time
PTR sys_mknod
parent_tidptr, child_tidptr);
}
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname((const char __user *) (long)regs.regs[4]);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename->name,
- (const char __user *const __user *) (long)regs.regs[5],
- (const char __user *const __user *) (long)regs.regs[6],
- ®s);
- putname(filename);
-
-out:
- return error;
-}
-
SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
{
struct thread_info *ti = task_thread_info(current);
{
do_exit(SIGSEGV);
}
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- register unsigned long __a0 asm("$4") = (unsigned long) filename;
- register unsigned long __a1 asm("$5") = (unsigned long) argv;
- register unsigned long __a2 asm("$6") = (unsigned long) envp;
- register unsigned long __a3 asm("$7");
- unsigned long __v0;
-
- __asm__ volatile (" \n"
- " .set noreorder \n"
- " li $2, %5 # __NR_execve \n"
- " syscall \n"
- " move %0, $2 \n"
- " .set reorder \n"
- : "=&r" (__v0), "=r" (__a3)
- : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
- : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
- "memory");
-
- if (__a3 == 0)
- return __v0;
-
- return -__v0;
-}
select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER
select GENERIC_CLOCKEVENTS
select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
select MODULES_USE_ELF_RELA
config AM33_2
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
-#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls
mov (REG_D0,fp),d0
mov (REG_A0,fp),a0
calls (a0)
- jmp sys_exit
-
-ENTRY(ret_from_kernel_execve)
- add -12,d0 /* pt_regs -> frame */
- mov d0,sp
- GET_THREAD_INFO a2
clr d0
+ mov d0,(REG_D0,fp)
jmp syscall_exit
###############################################################################
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
config MMU
def_bool y
#define sys_mmap2 sys_mmap_pgoff
+#define __ARCH_WANT_SYS_EXECVE
+
#include <asm-generic/unistd.h>
#define __NR_or1k_atomic __NR_arch_specific_syscall
l.jal schedule_tail
l.nop
+ /* Check if we are a kernel thread */
+ l.sfeqi r20,0
+ l.bf 1f
+ l.nop
+
+ /* ...we are a kernel thread so invoke the requested callback */
+ l.jalr r20
+ l.or r3,r22,r0
+
+1:
/* _syscall_returns expect r11 to contain return value */
l.lwz r11,PT_GPR11(r1)
l.j _syscall_return
l.nop
-/* Since syscalls don't save call-clobbered registers, the args to
- * kernel_thread_helper will need to be passed through callee-saved
- * registers and copied to the parameter registers when the thread
- * begins running.
- *
- * See arch/openrisc/kernel/process.c:
- * The args are passed as follows:
- * arg1 (r3) : passed in r20
- * arg2 (r4) : passed in r22
- */
-
-ENTRY(_kernel_thread_helper)
- l.or r3,r20,r0
- l.or r4,r22,r0
- l.movhi r31,hi(kernel_thread_helper)
- l.ori r31,r31,lo(kernel_thread_helper)
- l.jr r31
- l.nop
-
-
/* ========================================================[ switch ] === */
/*
/* Unwind stack to pre-switch state */
l.addi r1,r1,(INT_FRAME_SIZE)
- /* Return via the link-register back to where we 'came from', where that can be
- * either schedule() or return_from_fork()... */
+ /* Return via the link-register back to where we 'came from', where
+ * that may be either schedule(), ret_from_fork(), or
+ * ret_from_kernel_thread(). If we are returning to a new thread,
+ * we are expected to have set up the arg to schedule_tail already,
+ * hence we do so here unconditionally:
+ */
+ l.lwz r3,TI_STACK(r3) /* Load 'prev' as schedule_tail arg */
l.jr r9
l.nop
l.j _fork_save_extra_regs_and_call
l.addi r3,r1,0
-ENTRY(sys_execve)
- l.j _sys_execve
- l.addi r6,r1,0
-
ENTRY(sys_sigaltstack)
l.j _sys_sigaltstack
l.addi r5,r1,0
*/
extern asmlinkage void ret_from_fork(void);
+/*
+ * copy_thread
+ * @clone_flags: flags
+ * @usp: user stack pointer or fn for kernel thread
+ * @arg: arg to fn for kernel thread; always NULL for userspace thread
+ * @p: the newly created task
+ * @regs: CPU context to copy for userspace thread; always NULL for kthread
+ *
+ * At the top of a newly initialized kernel stack are two stacked pt_reg
+ * structures. The first (topmost) is the userspace context of the thread.
+ * The second is the kernelspace context of the thread.
+ *
+ * A kernel thread will not be returning to userspace, so the topmost pt_regs
+ * struct can be uninitialized; it _does_ need to exist, though, because
+ * a kernel thread can become a userspace thread by doing a kernel_execve, in
+ * which case the topmost context will be initialized and used for 'returning'
+ * to userspace.
+ *
+ * The second pt_reg struct needs to be initialized to 'return' to
+ * ret_from_fork. A kernel thread will need to set r20 to the address of
+ * a function to call into (with arg in r22); userspace threads need to set
+ * r20 to NULL in which case ret_from_fork will just continue a return to
+ * userspace.
+ *
+ * A kernel thread 'fn' may return; this is effectively what happens when
+ * kernel_execve is called. In that case, the userspace pt_regs must have
+ * been initialized (which kernel_execve takes care of, see start_thread
+ * below); ret_from_fork will then continue its execution causing the
+ * 'kernel thread' to return to userspace as a userspace thread.
+ */
+
int
copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused, struct task_struct *p, struct pt_regs *regs)
+ unsigned long arg, struct task_struct *p, struct pt_regs *regs)
{
- struct pt_regs *childregs;
+ struct pt_regs *userregs;
struct pt_regs *kregs;
unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
- struct thread_info *ti;
unsigned long top_of_kernel_stack;
top_of_kernel_stack = sp;
p->set_child_tid = p->clear_child_tid = NULL;
- /* Copy registers */
- /* redzone */
- sp -= STACK_FRAME_OVERHEAD;
+ /* Locate userspace context on stack... */
+ sp -= STACK_FRAME_OVERHEAD; /* redzone */
sp -= sizeof(struct pt_regs);
- childregs = (struct pt_regs *)sp;
+ userregs = (struct pt_regs *) sp;
- /* Copy parent registers */
- *childregs = *regs;
+ /* ...and kernel context */
+ sp -= STACK_FRAME_OVERHEAD; /* redzone */
+ sp -= sizeof(struct pt_regs);
+ kregs = (struct pt_regs *)sp;
- if ((childregs->sr & SPR_SR_SM) == 1) {
- /* for kernel thread, set `current_thread_info'
- * and stackptr in new task
- */
- childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
- childregs->gpr[10] = (unsigned long)task_thread_info(p);
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(kregs, 0, sizeof(struct pt_regs));
+ kregs->gpr[20] = usp; /* fn, kernel thread */
+ kregs->gpr[22] = arg;
} else {
- childregs->sp = usp;
- }
-
- childregs->gpr[11] = 0; /* Result from fork() */
+ *userregs = *regs;
- /*
- * The way this works is that at some point in the future
- * some task will call _switch to switch to the new task.
- * That will pop off the stack frame created below and start
- * the new task running at ret_from_fork. The new task will
- * do some house keeping and then return from the fork or clone
- * system call, using the stack frame created above.
- */
- /* redzone */
- sp -= STACK_FRAME_OVERHEAD;
- sp -= sizeof(struct pt_regs);
- kregs = (struct pt_regs *)sp;
+ userregs->sp = usp;
+ userregs->gpr[11] = 0; /* Result from fork() */
- ti = task_thread_info(p);
- ti->ksp = sp;
+ kregs->gpr[20] = 0; /* Userspace thread */
+ }
- /* kregs->sp must store the location of the 'pre-switch' kernel stack
- * pointer... for a newly forked process, this is simply the top of
- * the kernel stack.
+ /*
+ * _switch wants the kernel stack page in pt_regs->sp so that it
+ * can restore it to thread_info->ksp... see _switch for details.
*/
kregs->sp = top_of_kernel_stack;
- kregs->gpr[3] = (unsigned long)current; /* arg to schedule_tail */
- kregs->gpr[10] = (unsigned long)task_thread_info(p);
kregs->gpr[9] = (unsigned long)ret_from_fork;
+ task_thread_info(p)->ksp = (unsigned long)kregs;
+
return 0;
}
*/
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
{
- unsigned long sr = regs->sr & ~SPR_SR_SM;
+ unsigned long sr = mfspr(SPR_SR) & ~SPR_SR_SM;
set_fs(USER_DS);
- memset(regs->gpr, 0, sizeof(regs->gpr));
+ memset(regs, 0, sizeof(struct pt_regs));
regs->pc = pc;
regs->sr = sr;
regs->sp = sp;
-
-/* printk("start thread, ksp = %lx\n", current_thread_info()->ksp);*/
}
/* Fill in the fpu structure for a core dump. */
dest[35] = 0;
}
-extern void _kernel_thread_helper(void);
-
-void __noreturn kernel_thread_helper(int (*fn) (void *), void *arg)
-{
- do_exit(fn(arg));
-}
-
-/*
- * Create a kernel thread.
- */
-int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- regs.gpr[20] = (unsigned long)fn;
- regs.gpr[22] = (unsigned long)arg;
- regs.sr = mfspr(SPR_SR);
- regs.pc = (unsigned long)_kernel_thread_helper;
-
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
- 0, ®s, 0, NULL, NULL);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage long _sys_execve(const char __user *name,
- const char __user * const __user *argv,
- const char __user * const __user *envp,
- struct pt_regs *regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname(name);
- error = PTR_ERR(filename);
-
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename->name, argv, envp, regs);
- putname(filename);
-
-out:
- return error;
-}
-
unsigned long get_wchan(struct task_struct *p)
{
/* TODO */
return 0;
}
-
-int kernel_execve(const char *filename, char *const argv[], char *const envp[])
-{
- register long __res asm("r11") = __NR_execve;
- register long __a asm("r3") = (long)(filename);
- register long __b asm("r4") = (long)(argv);
- register long __c asm("r5") = (long)(envp);
- __asm__ volatile ("l.sys 1"
- : "=r" (__res), "=r"(__a), "=r"(__b), "=r"(__c)
- : "0"(__res), "1"(__a), "2"(__b), "3"(__c)
- : "r6", "r7", "r8", "r12", "r13", "r15",
- "r17", "r19", "r21", "r23", "r25", "r27",
- "r29", "r31");
- __asm__ volatile ("l.nop");
- return __res;
-}
select GENERIC_STRNCPY_FROM_USER
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
help
The PA-RISC microprocessor is designed by Hewlett-Packard and used
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
#endif /* __ASSEMBLY__ */
.import handle_interruption,code
.import do_cpu_irq_mask,code
- /*
- * r26 = function to be called
- * r25 = argument to pass in
- * r24 = flags for do_fork()
- *
- * Kernel threads don't ever return, so they don't need
- * a true register context. We just save away the arguments
- * for copy_thread/ret_ to properly set up the child.
- */
-
-#define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */
-#define CLONE_UNTRACED 0x00800000
-
- .import do_fork
-ENTRY(__kernel_thread)
- STREG %r2, -RP_OFFSET(%r30)
-
- copy %r30, %r1
- ldo PT_SZ_ALGN(%r30),%r30
-#ifdef CONFIG_64BIT
- /* Yo, function pointers in wide mode are little structs... -PB */
- ldd 24(%r26), %r2
- STREG %r2, PT_GR27(%r1) /* Store childs %dp */
- ldd 16(%r26), %r26
-
- STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */
- copy %r0, %r22 /* user_tid */
-#endif
- STREG %r26, PT_GR26(%r1) /* Store function & argument for child */
- STREG %r25, PT_GR25(%r1)
- ldil L%CLONE_UNTRACED, %r26
- ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */
- or %r26, %r24, %r26 /* will have kernel mappings. */
- ldi 1, %r25 /* stack_start, signals kernel thread */
- stw %r0, -52(%r30) /* user_tid */
-#ifdef CONFIG_64BIT
- ldo -16(%r30),%r29 /* Reference param save area */
-#endif
- BL do_fork, %r2
- copy %r1, %r24 /* pt_regs */
-
- /* Parent Returns here */
-
- LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2
- ldo -PT_SZ_ALGN(%r30), %r30
- bv %r0(%r2)
- nop
-ENDPROC(__kernel_thread)
-
/*
* Child Returns here
*
- * copy_thread moved args from temp save area set up above
- * into task save area.
+ * copy_thread moved args into task save area.
*/
ENTRY(ret_from_kernel_thread)
BL schedule_tail, %r2
nop
- LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1
+ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
LDREG TASK_PT_GR25(%r1), %r26
#ifdef CONFIG_64BIT
LDREG TASK_PT_GR27(%r1), %r27
- LDREG TASK_PT_GR22(%r1), %r22
#endif
LDREG TASK_PT_GR26(%r1), %r1
ble 0(%sr7, %r1)
copy %r31, %r2
-
-#ifdef CONFIG_64BIT
- ldo -16(%r30),%r29 /* Reference param save area */
- loadgp /* Thread could have been in a module */
-#endif
-#ifndef CONFIG_64BIT
- b sys_exit
-#else
- load32 sys_exit, %r1
- bv %r0(%r1)
-#endif
- ldi 0, %r26
-ENDPROC(ret_from_kernel_thread)
-
- .import sys_execve, code
-ENTRY(__execve)
- copy %r2, %r15
- copy %r30, %r16
- ldo PT_SZ_ALGN(%r30), %r30
- STREG %r26, PT_GR26(%r16)
- STREG %r25, PT_GR25(%r16)
- STREG %r24, PT_GR24(%r16)
-#ifdef CONFIG_64BIT
- ldo -16(%r30),%r29 /* Reference param save area */
-#endif
- BL sys_execve, %r2
- copy %r16, %r26
-
- cmpib,=,n 0,%r28,intr_return /* forward */
-
- /* yes, this will trap and die. */
- copy %r15, %r2
- copy %r16, %r30
- bv %r0(%r2)
+ b finish_child_return
nop
-ENDPROC(__execve)
+ENDPROC(ret_from_kernel_thread)
/*
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
ldo TASK_REGS(%r1),%r1
reg_save %r1
- mfctl %cr27, %r3
- STREG %r3, PT_CR27(%r1)
-
- STREG %r2,-RP_OFFSET(%r30)
- ldo FRAME_SIZE(%r30),%r30
-#ifdef CONFIG_64BIT
- ldo -16(%r30),%r29 /* Reference param save area */
-#endif
-
- /* These are call-clobbered registers and therefore
- also syscall-clobbered (we hope). */
- STREG %r2,PT_GR19(%r1) /* save for child */
- STREG %r30,PT_GR21(%r1)
+ mfctl %cr27, %r28
+ STREG %r28, PT_CR27(%r1)
LDREG PT_GR30(%r1),%r25
copy %r1,%r24
- BL sys_clone,%r2
+ b sys_clone
ldi SIGCHLD,%r26
-
- LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
-wrapper_exit:
- ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
- ldo TASK_REGS(%r1),%r1 /* get pt regs */
-
- LDREG PT_CR27(%r1), %r3
- mtctl %r3, %cr27
- reg_restore %r1
-
- /* strace expects syscall # to be preserved in r20 */
- ldi __NR_fork,%r20
- bv %r0(%r2)
- STREG %r20,PT_GR20(%r1)
ENDPROC(sys_fork_wrapper)
/* Set the return value for the child */
ENTRY(child_return)
BL schedule_tail, %r2
nop
+finish_child_return:
+ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+ ldo TASK_REGS(%r1),%r1 /* get pt regs */
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1
- LDREG TASK_PT_GR19(%r1),%r2
- b wrapper_exit
+ LDREG PT_CR27(%r1), %r3
+ mtctl %r3, %cr27
+ reg_restore %r1
+ b syscall_exit
copy %r0,%r28
ENDPROC(child_return)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
reg_save %r1
- mfctl %cr27, %r3
- STREG %r3, PT_CR27(%r1)
-
- STREG %r2,-RP_OFFSET(%r30)
- ldo FRAME_SIZE(%r30),%r30
-#ifdef CONFIG_64BIT
- ldo -16(%r30),%r29 /* Reference param save area */
-#endif
-
- /* WARNING - Clobbers r19 and r21, userspace must save these! */
- STREG %r2,PT_GR19(%r1) /* save for child */
- STREG %r30,PT_GR21(%r1)
- BL sys_clone,%r2
+ mfctl %cr27, %r28
+ STREG %r28, PT_CR27(%r1)
+ b sys_clone
copy %r1,%r24
-
- b wrapper_exit
- LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
ENDPROC(sys_clone_wrapper)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
reg_save %r1
- mfctl %cr27, %r3
- STREG %r3, PT_CR27(%r1)
+ mfctl %cr27, %r28
+ STREG %r28, PT_CR27(%r1)
- STREG %r2,-RP_OFFSET(%r30)
- ldo FRAME_SIZE(%r30),%r30
-#ifdef CONFIG_64BIT
- ldo -16(%r30),%r29 /* Reference param save area */
-#endif
-
- STREG %r2,PT_GR19(%r1) /* save for child */
- STREG %r30,PT_GR21(%r1)
-
- BL sys_vfork,%r2
+ b sys_vfork
copy %r1,%r26
-
- b wrapper_exit
- LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
ENDPROC(sys_vfork_wrapper)
- .macro execve_wrapper execve
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
- ldo TASK_REGS(%r1),%r1 /* get pt regs */
-
- /*
- * Do we need to save/restore r3-r18 here?
- * I don't think so. why would new thread need old
- * threads registers?
- */
-
- /* %arg0 - %arg3 are already saved for us. */
-
- STREG %r2,-RP_OFFSET(%r30)
- ldo FRAME_SIZE(%r30),%r30
-#ifdef CONFIG_64BIT
- ldo -16(%r30),%r29 /* Reference param save area */
-#endif
- BL \execve,%r2
- copy %r1,%arg0
-
- ldo -FRAME_SIZE(%r30),%r30
- LDREG -RP_OFFSET(%r30),%r2
-
- /* If exec succeeded we need to load the args */
-
- ldo -1024(%r0),%r1
- cmpb,>>= %r28,%r1,error_\execve
- copy %r2,%r19
-
-error_\execve:
- bv %r0(%r19)
- nop
- .endm
-
- .import sys_execve
-ENTRY(sys_execve_wrapper)
- execve_wrapper sys_execve
-ENDPROC(sys_execve_wrapper)
-
-#ifdef CONFIG_64BIT
- .import sys32_execve
-ENTRY(sys32_execve_wrapper)
- execve_wrapper sys32_execve
-ENDPROC(sys32_execve_wrapper)
-#endif
-
ENTRY(sys_rt_sigreturn_wrapper)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
ldo TASK_REGS(%r26),%r26 /* get pt regs */
#include <asm/io.h>
#include <asm/asm-offsets.h>
+#include <asm/assembly.h>
#include <asm/pdc.h>
#include <asm/pdc_chassis.h>
#include <asm/pgalloc.h>
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);
-/*
- * Create a kernel thread
- */
-
-extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
-
- /*
- * FIXME: Once we are sure we don't need any debug here,
- * kernel_thread can become a #define.
- */
-
- return __kernel_thread(fn, arg, flags);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Free current thread data structures etc..
*/
int
copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused, /* in ia64 this is "user_stack_size" */
- struct task_struct * p, struct pt_regs * pregs)
+ unsigned long arg,
+ struct task_struct *p, struct pt_regs *pregs)
{
struct pt_regs * cregs = &(p->thread.regs);
void *stack = task_stack_page(p);
#ifdef CONFIG_HPUX
extern void * const hpux_child_return;
#endif
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(cregs, 0, sizeof(struct pt_regs));
+ if (!usp) /* idle thread */
+ return 0;
- *cregs = *pregs;
-
- /* Set the return value for the child. Note that this is not
- actually restored by the syscall exit path, but we put it
- here for consistency in case of signals. */
- cregs->gr[28] = 0; /* child */
-
- /*
- * We need to differentiate between a user fork and a
- * kernel fork. We can't use user_mode, because the
- * the syscall path doesn't save iaoq. Right now
- * We rely on the fact that kernel_thread passes
- * in zero for usp.
- */
- if (usp == 1) {
/* kernel thread */
- cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN;
/* Must exit via ret_from_kernel_thread in order
* to call schedule_tail()
*/
+ cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
cregs->kpc = (unsigned long) &ret_from_kernel_thread;
/*
* Copy function and argument to be called from
* ret_from_kernel_thread.
*/
#ifdef CONFIG_64BIT
- cregs->gr[27] = pregs->gr[27];
+ cregs->gr[27] = ((unsigned long *)usp)[3];
+ cregs->gr[26] = ((unsigned long *)usp)[2];
+#else
+ cregs->gr[26] = usp;
#endif
- cregs->gr[26] = pregs->gr[26];
- cregs->gr[25] = pregs->gr[25];
+ cregs->gr[25] = arg;
} else {
/* user thread */
- /*
- * Note that the fork wrappers are responsible
- * for setting gr[21].
- */
-
- /* Use same stack depth as parent */
- cregs->ksp = (unsigned long)stack
- + (pregs->gr[21] & (THREAD_SIZE - 1));
cregs->gr[30] = usp;
+ cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
if (personality(p->personality) == PER_HPUX) {
#ifdef CONFIG_HPUX
cregs->kpc = (unsigned long) &hpux_child_return;
}
/* Setup thread TLS area from the 4th parameter in clone */
if (clone_flags & CLONE_SETTLS)
- cregs->cr27 = pregs->gr[23];
-
+ cregs->cr27 = pregs->gr[23];
}
return 0;
return t->thread.regs.kpc;
}
-/*
- * sys_execve() executes a new program.
- */
-
-asmlinkage int sys_execve(struct pt_regs *regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname((const char __user *) regs->gr[26]);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename->name,
- (const char __user *const __user *) regs->gr[25],
- (const char __user *const __user *) regs->gr[24],
- regs);
- putname(filename);
-out:
-
- return error;
-}
-
-extern int __execve(const char *filename,
- const char *const argv[],
- const char *const envp[], struct task_struct *task);
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- return __execve(filename, argv, envp, current);
-}
-
unsigned long
get_wchan(struct task_struct *p)
{
#define DBG(x)
#endif
-/*
- * sys32_execve() executes a new program.
- */
-
-asmlinkage int sys32_execve(struct pt_regs *regs)
-{
- int error;
- struct filename *filename;
-
- DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
- filename = getname((const char __user *) regs->gr[26]);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = compat_do_execve(filename->name, compat_ptr(regs->gr[25]),
- compat_ptr(regs->gr[24]), regs);
- putname(filename);
-out:
-
- return error;
-}
-
asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
int r22, int r21, int r20)
{
ENTRY_SAME(creat)
ENTRY_SAME(link)
ENTRY_SAME(unlink) /* 10 */
- ENTRY_DIFF(execve_wrapper)
+ ENTRY_COMP(execve)
ENTRY_SAME(chdir)
/* See comments in kernel/time.c!!! Maybe we don't need this? */
ENTRY_COMP(time)
select GENERIC_KERNEL_THREAD
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_EXECVE
config EARLY_PRINTK
bool
#define __ARCH_WANT_COMPAT_SYS_SENDFILE
#endif
#define __ARCH_WANT_SYS_EXECVE
-#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls
PPC440EP_ERR42
blrl
li r3,0
- b do_exit # no return
-
- .globl __ret_from_kernel_execve
-__ret_from_kernel_execve:
- addi r1,r3,-STACK_FRAME_OVERHEAD
b ret_from_syscall
/* Traced system call support */
_GLOBAL(ret_from_kernel_thread)
bl .schedule_tail
REST_NVGPRS(r1)
- REST_GPR(2,r1)
+ ld r14, 0(r14)
mtlr r14
mr r3,r15
blrl
li r3,0
- b .do_exit # no return
-
-_GLOBAL(__ret_from_kernel_execve)
- addi r1,r3,-STACK_FRAME_OVERHEAD
- li r10,1
- std r10,SOFTE(r1)
b syscall_exit
.section ".toc","aw"
/* Copy registers */
sp -= sizeof(struct pt_regs);
childregs = (struct pt_regs *) sp;
- if (!regs) {
- /* for kernel thread, set `current' and stackptr in new task */
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ struct thread_info *ti = (void *)task_stack_page(p);
memset(childregs, 0, sizeof(struct pt_regs));
childregs->gpr[1] = sp + sizeof(struct pt_regs);
+ childregs->gpr[14] = usp; /* function */
#ifdef CONFIG_PPC64
- childregs->gpr[14] = *(unsigned long *)usp;
- childregs->gpr[2] = ((unsigned long *)usp)[1],
clear_tsk_thread_flag(p, TIF_32BIT);
-#else
- childregs->gpr[14] = usp; /* function */
- childregs->gpr[2] = (unsigned long) p;
+ childregs->softe = 1;
#endif
childregs->gpr[15] = arg;
p->thread.regs = NULL; /* no user register state */
+ ti->flags |= _TIF_RESTOREALL;
f = ret_from_kernel_thread;
} else {
CHECK_FULL_REGS(regs);
*childregs = *regs;
- childregs->gpr[1] = usp;
+ if (usp)
+ childregs->gpr[1] = usp;
p->thread.regs = childregs;
childregs->gpr[3] = 0; /* Result from fork() */
if (clone_flags & CLONE_SETTLS) {
return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr);
}
-#define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))
-
int sys_clone(unsigned long clone_flags, unsigned long usp,
int __user *parent_tidp, void __user *child_threadptr,
int __user *child_tidp, int p6,
struct pt_regs *regs)
{
- CHECK_FULL_REGS(regs);
- if (usp == 0)
- usp = regs->gpr[1]; /* stack pointer for child */
-#ifdef CONFIG_PPC64
- if (is_32bit_task()) {
- parent_tidp = TRUNC_PTR(parent_tidp);
- child_tidp = TRUNC_PTR(child_tidp);
- }
-#endif
return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
}
unsigned long p4, unsigned long p5, unsigned long p6,
struct pt_regs *regs)
{
- CHECK_FULL_REGS(regs);
- return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);
+ return do_fork(SIGCHLD, 0, regs, 0, NULL, NULL);
}
int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
unsigned long p4, unsigned long p5, unsigned long p6,
struct pt_regs *regs)
{
- CHECK_FULL_REGS(regs);
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1],
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
regs, 0, NULL, NULL);
}
-void __ret_from_kernel_execve(struct pt_regs *normal)
-__noreturn;
-
-void ret_from_kernel_execve(struct pt_regs *normal)
-{
- set_thread_flag(TIF_RESTOREALL);
- __ret_from_kernel_execve(normal);
-}
-
static inline int valid_irq_stack(unsigned long sp, struct task_struct *p,
unsigned long nbytes)
{
select KTIME_SCALAR if 32BIT
select HAVE_ARCH_SECCOMP_FILTER
select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
# define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
# endif
#define __ARCH_WANT_SYS_EXECVE
-#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls
la %r11,STACK_FRAME_OVERHEAD(%r15)
l %r12,__LC_THREAD_INFO
l %r13,__LC_SVC_NEW_PSW+4
- tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
- je 1f
l %r1,BASED(.Lschedule_tail)
basr %r14,%r1 # call schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
- j sysc_tracenogo
-
-1: # it's a kernel thread
- st %r15,__PT_R15(%r11) # store stack pointer for new kthread
- l %r1,BASED(.Lschedule_tail)
- basr %r14,%r1 # call schedule_tail
- TRACE_IRQS_ON
- ssm __LC_SVC_NEW_PSW # reenable interrupts
- lm %r9,%r11,__PT_R9(%r11) # load gprs
+ tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
+ jne sysc_tracenogo
+ # it's a kernel thread
+ lm %r9,%r10,__PT_R9(%r11) # load gprs
ENTRY(kernel_thread_starter)
la %r2,0(%r10)
basr %r14,%r9
- la %r2,0
- br %r11 # do_exit
-
-#
-# kernel_execve function needs to deal with pt_regs that is not
-# at the usual place
-#
-ENTRY(ret_from_kernel_execve)
- ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
- lr %r15,%r2
- lr %r11,%r2
- ahi %r15,-STACK_FRAME_OVERHEAD
- xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
- l %r12,__LC_THREAD_INFO
- ssm __LC_SVC_NEW_PSW # reenable interrupts
- j sysc_return
+ j sysc_tracenogo
/*
* Program check handler routine
ENTRY(ret_from_fork)
la %r11,STACK_FRAME_OVERHEAD(%r15)
lg %r12,__LC_THREAD_INFO
- tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
- je 1f
brasl %r14,schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
- j sysc_tracenogo
-1: # it's a kernel thread
- stg %r15,__PT_R15(%r11) # store stack pointer for new kthread
- brasl %r14,schedule_tail
- TRACE_IRQS_ON
- ssm __LC_SVC_NEW_PSW # reenable interrupts
- lmg %r9,%r11,__PT_R9(%r11) # load gprs
+ tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
+ jne sysc_tracenogo
+ # it's a kernel thread
+ lmg %r9,%r10,__PT_R9(%r11) # load gprs
ENTRY(kernel_thread_starter)
la %r2,0(%r10)
basr %r14,%r9
- la %r2,0
- br %r11 # do_exit
-
-ENTRY(ret_from_kernel_execve)
- ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
- lgr %r15,%r2
- lgr %r11,%r2
- aghi %r15,-STACK_FRAME_OVERHEAD
- xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
- lg %r12,__LC_THREAD_INFO
- ssm __LC_SVC_NEW_PSW # reenable interrupts
- j sysc_return
+ j sysc_tracenogo
/*
* Program check handler routine
select GENERIC_CLOCKEVENTS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_REL
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
choice
prompt "System type"
*/
extern void (*cpu_wait)(void);
-extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *tsk);
extern void start_thread(struct pt_regs *regs,
unsigned long pc, unsigned long sp);
#define _ASM_SCORE_SYSCALLS_H
asmlinkage long score_clone(struct pt_regs *regs);
-asmlinkage long score_execve(struct pt_regs *regs);
asmlinkage long score_sigaltstack(struct pt_regs *regs);
asmlinkage long score_rt_sigreturn(struct pt_regs *regs);
#define __ARCH_WANT_SYSCALL_NO_FLAGS
#define __ARCH_WANT_SYSCALL_OFF_T
#define __ARCH_WANT_SYSCALL_DEPRECATED
+#define __ARCH_WANT_SYS_EXECVE
#include <asm-generic/unistd.h>
nop
#endif
+ENTRY(ret_from_kernel_thread)
+ bl schedule_tail # r4=struct task_struct *prev
+ nop
+ mv r4, r13
+ brl r12
+ j syscall_exit
+
ENTRY(ret_from_fork)
bl schedule_tail # r4=struct task_struct *prev
sw r9, [r0, PT_R7]
j syscall_return
-ENTRY(sys_execve)
- mv r4, r0
- la r8, score_execve
- br r8
-
ENTRY(sys_clone)
mv r4, r0
la r8, score_clone
}
void ret_from_fork(void);
+void ret_from_kernel_thread(void);
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
{
* set up the kernel stack and exception frames for a new process
*/
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *ti = task_thread_info(p);
struct pt_regs *childregs = task_pt_regs(p);
- p->set_child_tid = NULL;
- p->clear_child_tid = NULL;
-
- *childregs = *regs;
- childregs->regs[7] = 0; /* Clear error flag */
- childregs->regs[4] = 0; /* Child gets zero as return value */
- regs->regs[4] = p->pid;
-
- if (childregs->cp0_psr & 0x8) { /* test kernel fork or user fork */
- childregs->regs[0] = usp; /* user fork */
+ p->thread.reg0 = (unsigned long) childregs;
+ if (unlikely(!regs)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ p->thread->reg12 = usp;
+ p->thread->reg13 = arg;
+ p->thread.reg3 = (unsigned long) ret_from_kernel_thread;
} else {
- childregs->regs[28] = (unsigned long) ti; /* kernel fork */
- childregs->regs[0] = (unsigned long) childregs;
+ *childregs = *regs;
+ childregs->regs[7] = 0; /* Clear error flag */
+ childregs->regs[4] = 0; /* Child gets zero as return value */
+ childregs->regs[0] = usp; /* user fork */
+ regs->regs[4] = p->pid; /* WTF? */
+ p->thread.reg3 = (unsigned long) ret_from_fork;
}
- p->thread.reg0 = (unsigned long) childregs;
- p->thread.reg3 = (unsigned long) ret_from_fork;
p->thread.cp0_psr = 0;
return 0;
return 1;
}
-static void __noreturn
-kernel_thread_helper(void *unused0, int (*fn)(void *),
- void *arg, void *unused1)
-{
- do_exit(fn(arg));
-}
-
-/*
- * Create a kernel thread.
- */
-long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- regs.regs[6] = (unsigned long) arg;
- regs.regs[5] = (unsigned long) fn;
- regs.cp0_epc = (unsigned long) kernel_thread_helper;
- regs.cp0_psr = (regs.cp0_psr & ~(0x1|0x4|0x8)) | \
- ((regs.cp0_psr & 0x3) << 2);
-
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, \
- 0, ®s, 0, NULL, NULL);
-}
-
unsigned long thread_saved_pc(struct task_struct *tsk)
{
return task_pt_regs(tsk)->cp0_epc;
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
regs->regs[0], regs, 0, NULL, NULL);
}
-
-/*
- * sys_execve() executes a new program.
- * This is called indirectly via a small wrapper
- */
-asmlinkage long
-score_execve(struct pt_regs *regs)
-{
- int error;
- struct filename *filename;
-
- filename = getname((char __user*)regs->regs[4]);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- return error;
-
- error = do_execve(filename->name,
- (const char __user *const __user *)regs->regs[5],
- (const char __user *const __user *)regs->regs[6],
- regs);
-
- putname(filename);
- return error;
-}
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-asmlinkage
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- register unsigned long __r4 asm("r4") = (unsigned long) filename;
- register unsigned long __r5 asm("r5") = (unsigned long) argv;
- register unsigned long __r6 asm("r6") = (unsigned long) envp;
- register unsigned long __r7 asm("r7");
-
- __asm__ __volatile__ (" \n"
- "ldi r27, %5 \n"
- "syscall \n"
- "mv %0, r4 \n"
- "mv %1, r7 \n"
- : "=&r" (__r4), "=r" (__r7)
- : "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
- : "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
- "r26", "r27", "memory");
-
- if (__r7 == 0)
- return __r4;
-
- return -__r4;
-}
select GENERIC_STRNLEN_USER
select HAVE_MOD_ARCH_SPECIFIC if DWARF_UNWINDER
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
help
The SuperH is a RISC processor targeted for use in embedded systems
and consumer electronics; it was also used in the Sega Dreamcast
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
-/*
- * create a kernel thread without removing it from tasklists
- */
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
/* Copy and release all segment info associated with a VM */
#define copy_segments(p, mm) do { } while(0)
#define release_segments(mm) do { } while(0)
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
-/*
- * create a kernel thread without removing it from tasklists
- */
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
/* Copy and release all segment info associated with a VM */
#define copy_segments(p, mm) do { } while (0)
asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs __regs);
-asmlinkage int sys_execve(const char __user *ufilename,
- const char __user *const __user *uargv,
- const char __user *const __user *uenvp,
- unsigned long r7, struct pt_regs __regs);
asmlinkage int sys_sigsuspend(old_sigset_t mask);
asmlinkage int sys_sigaction(int sig, const struct old_sigaction __user *act,
struct old_sigaction __user *oact);
unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs *pregs);
-asmlinkage int sys_execve(const char *ufilename, char **uargv,
- char **uenvp, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs *pregs);
/* Misc syscall related bits */
asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs);
# define __ARCH_WANT_SYS_SIGPENDING
# define __ARCH_WANT_SYS_SIGPROCMASK
# define __ARCH_WANT_SYS_RT_SIGACTION
+# define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls
machvec.o nmi_debug.o process.o \
process_$(BITS).o ptrace.o ptrace_$(BITS).o \
reboot.o return_address.o \
- setup.o signal_$(BITS).o sys_sh.o sys_sh$(BITS).o \
+ setup.o signal_$(BITS).o sys_sh.o \
syscalls_$(BITS).o time.o topology.o traps.o \
traps_$(BITS).o unwinder.o
obj-$(CONFIG_HAS_IOPORT) += ioport.o
endif
+obj-$(CONFIG_SUPERH32) += sys_sh32.o
obj-y += cpu/
obj-$(CONFIG_VSYSCALL) += vsyscall/
obj-$(CONFIG_SMP) += smp.o
pta ret_from_syscall, tr0
blink tr0, ZERO
+.global ret_from_kernel_thread
+ret_from_kernel_thread:
+
+ movi schedule_tail,r5
+ ori r5, 1, r5
+ ptabs r5, tr0
+ blink tr0, LINK
+
+ ld.q SP, FRAME_R(2), r2
+ ld.q SP, FRAME_R(3), r3
+ ptabs r3, tr0
+ blink tr0, LINK
+
+ ld.q SP, FRAME_S(FSPC), r2
+ addi r2, 4, r2 /* Move PC, being pre-execution event */
+ st.q SP, FRAME_S(FSPC), r2
+ pta ret_from_syscall, tr0
+ blink tr0, ZERO
+
syscall_allowed:
/* Use LINK to deflect the exit point, default is syscall_ret */
pta syscall_ret, tr0
mov r0, r4
bra syscall_exit
nop
+
+ .align 2
+ .globl ret_from_kernel_thread
+ret_from_kernel_thread:
+ mov.l 1f, r8
+ jsr @r8
+ mov r0, r4
+ mov.l @(OFF_R5,r15), r5 ! fn
+ jsr @r5
+ mov.l @(OFF_R4,r15), r4 ! arg
+ bra syscall_exit
+ nop
+
.align 2
1: .long schedule_tail
show_code(regs);
}
-/*
- * Create a kernel thread
- */
-__noreturn void kernel_thread_helper(void *arg, int (*fn)(void *))
-{
- do_exit(fn(arg));
-}
-
-/* Don't use this in BL=1(cli). Or else, CPU resets! */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
- int pid;
-
- memset(®s, 0, sizeof(regs));
- regs.regs[4] = (unsigned long)arg;
- regs.regs[5] = (unsigned long)fn;
-
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.sr = SR_MD;
-#if defined(CONFIG_SH_FPU)
- regs.sr |= SR_FD;
-#endif
-
- /* Ok, create the new process.. */
- pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
- ®s, 0, NULL, NULL);
-
- return pid;
-}
-EXPORT_SYMBOL(kernel_thread);
-
void start_thread(struct pt_regs *regs, unsigned long new_pc,
unsigned long new_sp)
{
EXPORT_SYMBOL(dump_fpu);
asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *ti = task_thread_info(p);
}
#endif
- childregs = task_pt_regs(p);
- *childregs = *regs;
+ memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
- if (user_mode(regs)) {
- childregs->regs[15] = usp;
- ti->addr_limit = USER_DS;
- } else {
- childregs->regs[15] = (unsigned long)childregs;
+ childregs = task_pt_regs(p);
+ p->thread.sp = (unsigned long) childregs;
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ p->thread.pc = (unsigned long) ret_from_kernel_thread;
+ childregs->regs[4] = arg;
+ childregs->regs[5] = usp;
+ childregs->sr = SR_MD;
+#if defined(CONFIG_SH_FPU)
+ childregs->sr |= SR_FD;
+#endif
ti->addr_limit = KERNEL_DS;
ti->status &= ~TS_USEDFPU;
p->fpu_counter = 0;
+ return 0;
}
+ *childregs = *regs;
+
+ childregs->regs[15] = usp;
+ ti->addr_limit = USER_DS;
if (clone_flags & CLONE_SETTLS)
childregs->gbr = childregs->regs[0];
childregs->regs[0] = 0; /* Set return value for child */
-
- p->thread.sp = (unsigned long) childregs;
p->thread.pc = (unsigned long) ret_from_fork;
-
- memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
-
return 0;
}
0, NULL, NULL);
}
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *ufilename,
- const char __user *const __user *uargv,
- const char __user *const __user *uenvp,
- unsigned long r7, struct pt_regs __regs)
-{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
- int error;
- struct filename *filename;
-
- filename = getname(ufilename);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename->name, uargv, uenvp, regs);
- putname(filename);
-out:
- return error;
-}
-
unsigned long get_wchan(struct task_struct *p)
{
unsigned long pc;
}
}
-/*
- * Create a kernel thread
- */
-__noreturn void kernel_thread_helper(void *arg, int (*fn)(void *))
-{
- do_exit(fn(arg));
-}
-
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be freed until both the parent and the child have exited.
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
- regs.regs[2] = (unsigned long)arg;
- regs.regs[3] = (unsigned long)fn;
-
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.sr = (1 << 30);
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
- ®s, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Free current thread data structures etc..
*/
EXPORT_SYMBOL(dump_fpu);
asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
#ifdef CONFIG_SH_FPU
- if(last_task_used_math == current) {
+ /* can't happen for a kernel thread */
+ if (last_task_used_math == current) {
enable_fpu();
save_fpu(current);
disable_fpu();
#endif
/* Copy from sh version */
childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
+ p->thread.sp = (unsigned long) childregs;
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->regs[2] = (unsigned long)arg;
+ childregs->regs[3] = (unsigned long)fn;
+ childregs->sr = (1 << 30); /* not user_mode */
+ childregs->sr |= SR_FD; /* Invalidate FPU flag */
+ p->thread.pc = (unsigned long) ret_from_kernel_thread;
+ return 0;
+ }
*childregs = *regs;
/*
* 32-bit wide and context switch must take care
* of NEFF sign extension.
*/
- if (user_mode(regs)) {
- childregs->regs[15] = neff_sign_extend(usp);
- p->thread.uregs = childregs;
- } else {
- childregs->regs[15] =
- neff_sign_extend((unsigned long)task_stack_page(p) +
- THREAD_SIZE);
- }
+ childregs->regs[15] = neff_sign_extend(usp);
+ p->thread.uregs = childregs;
childregs->regs[9] = 0; /* Set return value for child */
childregs->sr |= SR_FD; /* Invalidate FPU flag */
- p->thread.sp = (unsigned long) childregs;
p->thread.pc = (unsigned long) ret_from_fork;
return 0;
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
}
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char *ufilename, char **uargv,
- char **uenvp, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs *pregs)
-{
- int error;
- struct filename *filename;
-
- filename = getname((char __user *)ufilename);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename->name,
- (const char __user *const __user *)uargv,
- (const char __user *const __user *)uenvp,
- pregs);
- putname(filename);
-out:
- return error;
-}
-
#ifdef CONFIG_FRAME_POINTER
static int in_sh64_switch_to(unsigned long pc)
{
(u64)len0 << 32 | len1, advice);
#endif
}
-
-#if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A)
-#define SYSCALL_ARG3 "trapa #0x23"
-#else
-#define SYSCALL_ARG3 "trapa #0x13"
-#endif
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- register long __sc0 __asm__ ("r3") = __NR_execve;
- register long __sc4 __asm__ ("r4") = (long) filename;
- register long __sc5 __asm__ ("r5") = (long) argv;
- register long __sc6 __asm__ ("r6") = (long) envp;
- __asm__ __volatile__ (SYSCALL_ARG3 : "=z" (__sc0)
- : "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6)
- : "memory");
- return __sc0;
-}
+++ /dev/null
-/*
- * arch/sh/kernel/sys_sh64.c
- *
- * Copyright (C) 2000, 2001 Paolo Alberelli
- *
- * This file contains various random system calls that
- * have a non-standard calling sequence on the Linux/SH5
- * platform.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#include <linux/errno.h>
-#include <linux/rwsem.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/fs.h>
-#include <linux/smp.h>
-#include <linux/sem.h>
-#include <linux/msg.h>
-#include <linux/shm.h>
-#include <linux/stat.h>
-#include <linux/mman.h>
-#include <linux/file.h>
-#include <linux/syscalls.h>
-#include <linux/ipc.h>
-#include <asm/uaccess.h>
-#include <asm/ptrace.h>
-#include <asm/unistd.h>
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- register unsigned long __sc0 __asm__ ("r9") = ((0x13 << 16) | __NR_execve);
- register unsigned long __sc2 __asm__ ("r2") = (unsigned long) filename;
- register unsigned long __sc3 __asm__ ("r3") = (unsigned long) argv;
- register unsigned long __sc4 __asm__ ("r4") = (unsigned long) envp;
- __asm__ __volatile__ ("trapa %1 !\t\t\t execve(%2,%3,%4)"
- : "=r" (__sc0)
- : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) );
- __asm__ __volatile__ ("!dummy %0 %1 %2 %3"
- : : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) : "memory");
- return __sc0;
-}
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
config SPARC32
def_bool !64BIT
/* Free all resources held by a thread. */
#define release_thread(tsk) do { } while(0)
-extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long get_wchan(struct task_struct *);
#ifndef __ASSEMBLY__
#include <linux/types.h>
+#include <asm/fpumacro.h>
/* Return saved PC of a blocked thread. */
struct task_struct;
: \
: "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
+ fprs_write(0); \
+ current_thread_info()->xfsr[0] = 0; \
+ current_thread_info()->fpsaved[0] = 0; \
+ regs->tstate &= ~TSTATE_PEF; \
} while (0)
#define start_thread32(regs, pc, sp) \
: \
: "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
+ fprs_write(0); \
+ current_thread_info()->xfsr[0] = 0; \
+ current_thread_info()->fpsaved[0] = 0; \
+ regs->tstate &= ~TSTATE_PEF; \
} while (0)
/* Free all resources held by a thread. */
#define release_thread(tsk) do { } while (0)
-extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
extern unsigned long get_wchan(struct task_struct *task);
#define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
#define arch_ptrace_stop(exit_code, info) \
synchronize_user_stack()
+#define current_pt_regs() \
+ ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
+
struct global_reg_snapshot {
unsigned long tstate;
unsigned long tpc;
extern union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
-#define force_successful_syscall_return() \
-do { current_thread_info()->syscall_noerror = 1; \
-} while (0)
+#define force_successful_syscall_return() set_thread_noerror(1)
#define user_mode(regs) (!((regs)->tstate & TSTATE_PRIV))
#define instruction_pointer(regs) ((regs)->tpc)
#define instruction_pointer_set(regs, val) ((regs)->tpc = (val))
#define arch_ptrace_stop(exit_code, info) \
synchronize_user_stack()
+#define current_pt_regs() \
+ ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
+
#define user_mode(regs) (!((regs)->psr & PSR_PS))
#define instruction_pointer(regs) ((regs)->pc)
#define user_stack_pointer(regs) ((regs)->u_regs[UREG_FP])
/* If you are tempted to conditionalize the following */ \
/* so that ASI is only written if it changes, think again. */ \
__asm__ __volatile__("wr %%g0, %0, %%asi" \
- : : "r" (__thread_flag_byte_ptr(task_thread_info(next))[TI_FLAG_BYTE_CURRENT_DS]));\
+ : : "r" (task_thread_info(next)->current_ds));\
trap_block[current_thread_info()->cpu].thread = \
task_thread_info(next); \
__asm__ __volatile__( \
struct pt_regs *regs,
unsigned long stack_size);
-extern asmlinkage int sparc_execve(struct pt_regs *regs);
-
#endif /* _SPARC64_SYSCALLS_H */
#define TI_FLAG_FAULT_CODE_SHIFT 56
#define TI_FLAG_BYTE_WSTATE 1
#define TI_FLAG_WSTATE_SHIFT 48
-#define TI_FLAG_BYTE_CWP 2
-#define TI_FLAG_CWP_SHIFT 40
-#define TI_FLAG_BYTE_CURRENT_DS 3
-#define TI_FLAG_CURRENT_DS_SHIFT 32
-#define TI_FLAG_BYTE_FPDEPTH 4
-#define TI_FLAG_FPDEPTH_SHIFT 24
+#define TI_FLAG_BYTE_NOERROR 2
+#define TI_FLAG_BYTE_NOERROR_SHIFT 40
+#define TI_FLAG_BYTE_FPDEPTH 3
+#define TI_FLAG_FPDEPTH_SHIFT 32
+#define TI_FLAG_BYTE_CWP 4
+#define TI_FLAG_CWP_SHIFT 24
#define TI_FLAG_BYTE_WSAVED 5
#define TI_FLAG_WSAVED_SHIFT 16
struct exec_domain *exec_domain;
int preempt_count; /* 0 => preemptable, <0 => BUG */
__u8 new_child;
- __u8 syscall_noerror;
+ __u8 current_ds;
__u16 cpu;
unsigned long *utraps;
#define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
#define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
#define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
-#define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
#define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
+#define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
#define TI_FPSAVED 0x00000010
#define TI_KSP 0x00000018
#define TI_FAULT_ADDR 0x00000020
#define TI_EXEC_DOMAIN 0x00000030
#define TI_PRE_COUNT 0x00000038
#define TI_NEW_CHILD 0x0000003c
-#define TI_SYS_NOERROR 0x0000003d
+#define TI_CURRENT_DS 0x0000003d
#define TI_CPU 0x0000003e
#define TI_UTRAPS 0x00000040
#define TI_REG_WINDOW 0x00000048
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
- .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
+ .current_ds = ASI_P, \
.exec_domain = &default_exec_domain, \
.preempt_count = INIT_PREEMPT_COUNT, \
.restart_block = { \
#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
-#define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
-#define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
+#define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
+#define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
-
#endif /* !(__ASSEMBLY__) */
/*
#define VERIFY_READ 0
#define VERIFY_WRITE 1
-#define get_fs() ((mm_segment_t) { get_thread_current_ds() })
+#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
#define get_ds() (KERNEL_DS)
#define segment_eq(a,b) ((a).seg == (b).seg)
#define set_fs(val) \
do { \
- set_thread_current_ds((val).seg); \
+ current_thread_info()->current_ds =(val).seg; \
__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \
} while(0)
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_COMPAT_SYS_SENDFILE
#endif
+#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls
call c_sys_nis_syscall
mov %l5, %o7
- .align 4
- .globl sys_execve
-sys_execve:
- mov %o7, %l5
- add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
- call sparc_execve
- mov %l5, %o7
-
- .globl sunos_execv
sunos_execv:
- st %g0, [%sp + STACKFRAME_SZ + PT_I2]
-
- call sparc_execve
- add %sp, STACKFRAME_SZ, %o0
-
- b ret_sys_call
- ld [%sp + STACKFRAME_SZ + PT_I0], %o0
+ .globl sunos_execv
+ b sys_execve
+ clr %i2
.align 4
.globl sys_sparc_pipe
.align 4
linux_sparc_ni_syscall:
sethi %hi(sys_ni_syscall), %l7
- b syscall_is_too_hard
+ b do_syscall
or %l7, %lo(sys_ni_syscall), %l7
-linux_fast_syscall:
- andn %l7, 3, %l7
- mov %i0, %o0
- mov %i1, %o1
- mov %i2, %o2
- jmpl %l7 + %g0, %g0
- mov %i3, %o3
-
linux_syscall_trace:
add %sp, STACKFRAME_SZ, %o0
call syscall_trace
b ret_sys_call
ld [%sp + STACKFRAME_SZ + PT_I0], %o0
+ .globl ret_from_kernel_thread
+ret_from_kernel_thread:
+ call schedule_tail
+ ld [%g3 + TI_TASK], %o0
+ ld [%sp + STACKFRAME_SZ + PT_G1], %l0
+ call %l0
+ ld [%sp + STACKFRAME_SZ + PT_G2], %o0
+ rd %psr, %l1
+ ld [%sp + STACKFRAME_SZ + PT_PSR], %l0
+ andn %l0, PSR_CWP, %l0
+ nop
+ and %l1, PSR_CWP, %l1
+ or %l0, %l1, %l0
+ st %l0, [%sp + STACKFRAME_SZ + PT_PSR]
+ b ret_sys_call
+ mov 0, %o0
+
/* Linux native system calls enter here... */
.align 4
.globl linux_sparc_syscall
bgeu linux_sparc_ni_syscall
sll %g1, 2, %l4
ld [%l7 + %l4], %l7
- andcc %l7, 1, %g0
- bne linux_fast_syscall
- /* Just do first insn from SAVE_ALL in the delay slot */
-syscall_is_too_hard:
+do_syscall:
SAVE_ALL_HEAD
rd %wim, %l3
rdpr %wstate, %g2
wrpr %g0, 0, %canrestore
sll %g2, 3, %g2
+
+ /* Set TI_SYS_FPDEPTH to 1 and clear TI_SYS_NOERROR. */
mov 1, %l5
- stb %l5, [%l6 + TI_FPDEPTH]
+ sth %l5, [%l6 + TI_SYS_NOERROR]
wrpr %g3, 0, %otherwin
wrpr %g2, 0, %wstate
add %l6, TI_FPSAVED + 1, %l4
srl %l5, 1, %l3
add %l5, 2, %l5
- stb %l5, [%l6 + TI_FPDEPTH]
+
+ /* Set TI_SYS_FPDEPTH to %l5 and clear TI_SYS_NOERROR. */
+ sth %l5, [%l6 + TI_SYS_NOERROR]
ba,pt %xcc, 2b
stb %g0, [%l4 + %l3]
nop
* XXX See comment above sys_vfork in sparc64. todo.
*/
extern void ret_from_fork(void);
+extern void ret_from_kernel_thread(void);
int copy_thread(unsigned long clone_flags, unsigned long sp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *ti = task_thread_info(p);
}
/*
- * p->thread_info new_stack childregs
- * ! ! ! {if(PSR_PS) }
- * V V (stk.fr.) V (pt_regs) { (stk.fr.) }
- * +----- - - - - - ------+===========+============={+==========}+
+ * p->thread_info new_stack childregs stack bottom
+ * ! ! ! !
+ * V V (stk.fr.) V (pt_regs) V
+ * +----- - - - - - ------+===========+=============+
*/
new_stack = task_stack_page(p) + THREAD_SIZE;
- if (regs->psr & PSR_PS)
- new_stack -= STACKFRAME_SZ;
new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
- memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
/*
* Thus, kpsr|=PSR_PIL.
*/
ti->ksp = (unsigned long) new_stack;
+ p->thread.kregs = childregs;
+
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ extern int nwindows;
+ unsigned long psr;
+ memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
+ p->thread.flags |= SPARC_FLAG_KTHREAD;
+ p->thread.current_ds = KERNEL_DS;
+ ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
+ childregs->u_regs[UREG_G1] = sp; /* function */
+ childregs->u_regs[UREG_G2] = arg;
+ psr = childregs->psr = get_psr();
+ ti->kpsr = psr | PSR_PIL;
+ ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows);
+ return 0;
+ }
+ memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
+ childregs->u_regs[UREG_FP] = sp;
+ p->thread.flags &= ~SPARC_FLAG_KTHREAD;
+ p->thread.current_ds = USER_DS;
ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
ti->kwim = current->thread.fork_kwim;
- if(regs->psr & PSR_PS) {
- extern struct pt_regs fake_swapper_regs;
+ if (sp != regs->u_regs[UREG_FP]) {
+ struct sparc_stackf __user *childstack;
+ struct sparc_stackf __user *parentstack;
- p->thread.kregs = &fake_swapper_regs;
- new_stack += STACKFRAME_SZ + TRACEREG_SZ;
- childregs->u_regs[UREG_FP] = (unsigned long) new_stack;
- p->thread.flags |= SPARC_FLAG_KTHREAD;
- p->thread.current_ds = KERNEL_DS;
- memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ);
- childregs->u_regs[UREG_G6] = (unsigned long) ti;
- } else {
- p->thread.kregs = childregs;
- childregs->u_regs[UREG_FP] = sp;
- p->thread.flags &= ~SPARC_FLAG_KTHREAD;
- p->thread.current_ds = USER_DS;
-
- if (sp != regs->u_regs[UREG_FP]) {
- struct sparc_stackf __user *childstack;
- struct sparc_stackf __user *parentstack;
-
- /*
- * This is a clone() call with supplied user stack.
- * Set some valid stack frames to give to the child.
- */
- childstack = (struct sparc_stackf __user *)
- (sp & ~0xfUL);
- parentstack = (struct sparc_stackf __user *)
- regs->u_regs[UREG_FP];
+ /*
+ * This is a clone() call with supplied user stack.
+ * Set some valid stack frames to give to the child.
+ */
+ childstack = (struct sparc_stackf __user *)
+ (sp & ~0xfUL);
+ parentstack = (struct sparc_stackf __user *)
+ regs->u_regs[UREG_FP];
#if 0
- printk("clone: parent stack:\n");
- show_stackframe(parentstack);
+ printk("clone: parent stack:\n");
+ show_stackframe(parentstack);
#endif
- childstack = clone_stackframe(childstack, parentstack);
- if (!childstack)
- return -EFAULT;
+ childstack = clone_stackframe(childstack, parentstack);
+ if (!childstack)
+ return -EFAULT;
#if 0
- printk("clone: child stack:\n");
- show_stackframe(childstack);
+ printk("clone: child stack:\n");
+ show_stackframe(childstack);
#endif
- childregs->u_regs[UREG_FP] = (unsigned long)childstack;
- }
+ childregs->u_regs[UREG_FP] = (unsigned long)childstack;
}
#ifdef CONFIG_SMP
return 1;
}
-/*
- * sparc_execve() executes a new program after the asm stub has set
- * things up for us. This should basically do what I want it to.
- */
-asmlinkage int sparc_execve(struct pt_regs *regs)
-{
- int error, base = 0;
- struct filename *filename;
-
- /* Check for indirect call. */
- if(regs->u_regs[UREG_G1] == 0)
- base = 1;
-
- filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
- error = PTR_ERR(filename);
- if(IS_ERR(filename))
- goto out;
- error = do_execve(filename->name,
- (const char __user *const __user *)
- regs->u_regs[base + UREG_I1],
- (const char __user *const __user *)
- regs->u_regs[base + UREG_I2],
- regs);
- putname(filename);
-out:
- return error;
-}
-
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be freed until both the parent and the child have exited.
- */
-pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- long retval;
-
- __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */
- "mov %5, %%g3\n\t" /* and arg. */
- "mov %1, %%g1\n\t"
- "mov %2, %%o0\n\t" /* Clone flags. */
- "mov 0, %%o1\n\t" /* usp arg == 0 */
- "t 0x10\n\t" /* Linux/Sparc clone(). */
- "cmp %%o1, 0\n\t"
- "be 1f\n\t" /* The parent, just return. */
- " nop\n\t" /* Delay slot. */
- "jmpl %%g2, %%o7\n\t" /* Call the function. */
- " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */
- "mov %3, %%g1\n\t"
- "t 0x10\n\t" /* Linux/Sparc exit(). */
- /* Notreached by child. */
- "1: mov %%o0, %0\n\t" :
- "=r" (retval) :
- "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
- "i" (__NR_exit), "r" (fn), "r" (arg) :
- "g1", "g2", "g3", "o0", "o1", "memory", "cc");
- return retval;
-}
-EXPORT_SYMBOL(kernel_thread);
-
unsigned long get_wchan(struct task_struct *task)
{
unsigned long pc, fp, bias = 0;
* Child --> %o0 == parents pid, %o1 == 1
*/
int copy_thread(unsigned long clone_flags, unsigned long sp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *t = task_thread_info(p);
struct sparc_stackf *parent_sf;
unsigned long child_stack_sz;
char *child_trap_frame;
- int kernel_thread;
-
- kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0;
- parent_sf = ((struct sparc_stackf *) regs) - 1;
/* Calculate offset to stack_frame & pt_regs */
- child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) +
- (kernel_thread ? STACKFRAME_SZ : 0));
+ child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
child_trap_frame = (task_stack_page(p) +
(THREAD_SIZE - child_stack_sz));
- memcpy(child_trap_frame, parent_sf, child_stack_sz);
- t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) |
- (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
- (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
t->new_child = 1;
t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
t->kregs = (struct pt_regs *) (child_trap_frame +
sizeof(struct sparc_stackf));
t->fpsaved[0] = 0;
- if (kernel_thread) {
- struct sparc_stackf *child_sf = (struct sparc_stackf *)
- (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ));
-
- /* Zero terminate the stack backtrace. */
- child_sf->fp = NULL;
- t->kregs->u_regs[UREG_FP] =
- ((unsigned long) child_sf) - STACK_BIAS;
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(child_trap_frame, 0, child_stack_sz);
+ __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
+ (current_pt_regs()->tstate + 1) & TSTATE_CWP;
+ t->current_ds = ASI_P;
+ t->kregs->u_regs[UREG_G1] = sp; /* function */
+ t->kregs->u_regs[UREG_G2] = arg;
+ return 0;
+ }
- t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
- t->kregs->u_regs[UREG_G6] = (unsigned long) t;
- t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
- } else {
- if (t->flags & _TIF_32BIT) {
- sp &= 0x00000000ffffffffUL;
- regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
- }
- t->kregs->u_regs[UREG_FP] = sp;
- t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
- if (sp != regs->u_regs[UREG_FP]) {
- unsigned long csp;
-
- csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
- if (!csp)
- return -EFAULT;
- t->kregs->u_regs[UREG_FP] = csp;
- }
- if (t->utraps)
- t->utraps[0]++;
+ parent_sf = ((struct sparc_stackf *) regs) - 1;
+ memcpy(child_trap_frame, parent_sf, child_stack_sz);
+ if (t->flags & _TIF_32BIT) {
+ sp &= 0x00000000ffffffffUL;
+ regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
}
+ t->kregs->u_regs[UREG_FP] = sp;
+ __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
+ (regs->tstate + 1) & TSTATE_CWP;
+ t->current_ds = ASI_AIUS;
+ if (sp != regs->u_regs[UREG_FP]) {
+ unsigned long csp;
+
+ csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
+ if (!csp)
+ return -EFAULT;
+ t->kregs->u_regs[UREG_FP] = csp;
+ }
+ if (t->utraps)
+ t->utraps[0]++;
/* Set the return value for the child. */
t->kregs->u_regs[UREG_I0] = current->pid;
return 0;
}
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be freed until both the parent and the child have exited.
- */
-pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- long retval;
-
- /* If the parent runs before fn(arg) is called by the child,
- * the input registers of this function can be clobbered.
- * So we stash 'fn' and 'arg' into global registers which
- * will not be modified by the parent.
- */
- __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
- "mov %5, %%g3\n\t" /* Save ARG into global */
- "mov %1, %%g1\n\t" /* Clone syscall nr. */
- "mov %2, %%o0\n\t" /* Clone flags. */
- "mov 0, %%o1\n\t" /* usp arg == 0 */
- "t 0x6d\n\t" /* Linux/Sparc clone(). */
- "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
- " mov %%o0, %0\n\t"
- "jmpl %%g2, %%o7\n\t" /* Call the function. */
- " mov %%g3, %%o0\n\t" /* Set arg in delay. */
- "mov %3, %%g1\n\t"
- "t 0x6d\n\t" /* Linux/Sparc exit(). */
- /* Notreached by child. */
- "1:" :
- "=r" (retval) :
- "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
- "i" (__NR_exit), "r" (fn), "r" (arg) :
- "g1", "g2", "g3", "o0", "o1", "memory", "cc");
- return retval;
-}
-EXPORT_SYMBOL(kernel_thread);
-
typedef struct {
union {
unsigned int pr_regs[32];
}
EXPORT_SYMBOL(dump_fpu);
-/*
- * sparc_execve() executes a new program after the asm stub has set
- * things up for us. This should basically do what I want it to.
- */
-asmlinkage int sparc_execve(struct pt_regs *regs)
-{
- int error, base = 0;
- struct filename *filename;
-
- /* User register window flush is done by entry.S */
-
- /* Check for indirect call. */
- if (regs->u_regs[UREG_G1] == 0)
- base = 1;
-
- filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename->name,
- (const char __user *const __user *)
- regs->u_regs[base + UREG_I1],
- (const char __user *const __user *)
- regs->u_regs[base + UREG_I2], regs);
- putname(filename);
- if (!error) {
- fprs_write(0);
- current_thread_info()->xfsr[0] = 0;
- current_thread_info()->fpsaved[0] = 0;
- regs->tstate &= ~TSTATE_PEF;
- }
-out:
- return error;
-}
-
unsigned long get_wchan(struct task_struct *task)
{
unsigned long pc, fp, bias = 0;
return ret;
}
-/*
- * sparc32_execve() executes a new program after the asm stub has set
- * things up for us. This should basically do what I want it to.
- */
-asmlinkage long sparc32_execve(struct pt_regs *regs)
-{
- int error, base = 0;
- struct filename *filename;
-
- /* User register window flush is done by entry.S */
-
- /* Check for indirect call. */
- if ((u32)regs->u_regs[UREG_G1] == 0)
- base = 1;
-
- filename = getname(compat_ptr(regs->u_regs[base + UREG_I0]));
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
-
- error = compat_do_execve(filename->name,
- compat_ptr(regs->u_regs[base + UREG_I1]),
- compat_ptr(regs->u_regs[base + UREG_I2]), regs);
-
- putname(filename);
-
- if (!error) {
- fprs_write(0);
- current_thread_info()->xfsr[0] = 0;
- current_thread_info()->fpsaved[0] = 0;
- regs->tstate &= ~TSTATE_PEF;
- }
-out:
- return error;
-}
-
#ifdef CONFIG_MODULES
asmlinkage long sys32_init_module(void __user *umod, u32 len,
up_read(&uts_sem);
return err;
}
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- long __res;
- register long __g1 __asm__ ("g1") = __NR_execve;
- register long __o0 __asm__ ("o0") = (long)(filename);
- register long __o1 __asm__ ("o1") = (long)(argv);
- register long __o2 __asm__ ("o2") = (long)(envp);
- asm volatile ("t 0x10\n\t"
- "bcc 1f\n\t"
- "mov %%o0, %0\n\t"
- "sub %%g0, %%o0, %0\n\t"
- "1:\n\t"
- : "=r" (__res), "=&r" (__o0)
- : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
- : "cc");
- return __res;
-}
return ret;
}
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
- const char *const argv[],
- const char *const envp[])
-{
- long __res;
- register long __g1 __asm__ ("g1") = __NR_execve;
- register long __o0 __asm__ ("o0") = (long)(filename);
- register long __o1 __asm__ ("o1") = (long)(argv);
- register long __o2 __asm__ ("o2") = (long)(envp);
- asm volatile ("t 0x6d\n\t"
- "sub %%g0, %%o0, %0\n\t"
- "movcc %%xcc, %%o0, %0\n\t"
- : "=r" (__res), "=&r" (__o0)
- : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
- : "cc");
- return __res;
-}
-
asmlinkage long sys_kern_features(void)
{
return KERN_FEATURE_MIXED_MODE_STACK;
/* SunOS's execv() call only specifies the argv argument, the
* environment settings are the same as the calling processes.
*/
-sys_execve:
- sethi %hi(sparc_execve), %g1
- ba,pt %xcc, execve_merge
- or %g1, %lo(sparc_execve), %g1
+sys64_execve:
+ set sys_execve, %g1
+ jmpl %g1, %g0
+ flushw
#ifdef CONFIG_COMPAT
sunos_execv:
- stx %g0, [%sp + PTREGS_OFF + PT_V9_I2]
+ mov %g0, %o2
sys32_execve:
- sethi %hi(sparc32_execve), %g1
- or %g1, %lo(sparc32_execve), %g1
-#endif
-
-execve_merge:
- flushw
+ set compat_sys_execve, %g1
jmpl %g1, %g0
- add %sp, PTREGS_OFF, %o0
+ flushw
+#endif
.align 32
sys_sparc_pipe:
ret_from_syscall:
/* Clear current_thread_info()->new_child. */
stb %g0, [%g6 + TI_NEW_CHILD]
- ldx [%g6 + TI_FLAGS], %l0
call schedule_tail
mov %g7, %o0
+ ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0
+ brnz,pt %o0, ret_sys_call
+ ldx [%g6 + TI_FLAGS], %l0
+ ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1
+ call %l1
+ ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0
ba,pt %xcc, ret_sys_call
- ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0
+ mov 0, %o0
.globl sparc_exit
.type sparc_exit,#function
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
2:
- stb %g0, [%g6 + TI_SYS_NOERROR]
/* System call success, clear Carry condition code. */
andn %g3, %g2, %g3
3:
/*40*/ .word sys_newlstat, sys_dup, sys_sparc_pipe, sys_times, sys_nis_syscall
.word sys_umount, sys_setgid, sys_getgid, sys_signal, sys_geteuid
/*50*/ .word sys_getegid, sys_acct, sys_memory_ordering, sys_nis_syscall, sys_ioctl
- .word sys_reboot, sys_nis_syscall, sys_symlink, sys_readlink, sys_execve
+ .word sys_reboot, sys_nis_syscall, sys_symlink, sys_readlink, sys64_execve
/*60*/ .word sys_umask, sys_chroot, sys_newfstat, sys_fstat64, sys_getpagesize
.word sys_msync, sys_vfork, sys_pread64, sys_pwrite64, sys_nis_syscall
/*70*/ .word sys_nis_syscall, sys_mmap, sys_nis_syscall, sys_64_munmap, sys_mprotect
TI_PRE_COUNT != offsetof(struct thread_info,
preempt_count) ||
TI_NEW_CHILD != offsetof(struct thread_info, new_child) ||
- TI_SYS_NOERROR != offsetof(struct thread_info,
- syscall_noerror) ||
+ TI_CURRENT_DS != offsetof(struct thread_info,
+ current_ds) ||
TI_RESTART_BLOCK != offsetof(struct thread_info,
restart_block) ||
TI_KUNA_REGS != offsetof(struct thread_info,
void prom_world(int enter)
{
if (!enter)
- set_fs((mm_segment_t) { get_thread_current_ds() });
+ set_fs(get_fs());
__asm__ __volatile__("flushw");
}
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT
struct compat_sigaction;
struct compat_siginfo;
struct compat_sigaltstack;
-long compat_sys_execve(const char __user *path,
- compat_uptr_t __user *argv,
- compat_uptr_t __user *envp, struct pt_regs *);
long compat_sys_rt_sigaction(int sig, struct compat_sigaction __user *act,
struct compat_sigaction __user *oact,
size_t sigsetsize);
long compat_sys_rt_sigqueueinfo(int pid, int sig,
struct compat_siginfo __user *uinfo);
-long compat_sys_rt_sigreturn(struct pt_regs *);
+long compat_sys_rt_sigreturn(void);
long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
- struct compat_sigaltstack __user *uoss_ptr,
- struct pt_regs *);
+ struct compat_sigaltstack __user *uoss_ptr);
long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high);
long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high);
long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
long compat_sys_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval);
-/* These are the intvec_64.S trampolines. */
-long _compat_sys_execve(const char __user *path,
- const compat_uptr_t __user *argv,
- const compat_uptr_t __user *envp);
-long _compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
- struct compat_sigaltstack __user *uoss_ptr);
+/* Assembly trampoline to avoid clobbering r0. */
long _compat_sys_rt_sigreturn(void);
#endif /* _ASM_TILE_COMPAT_H */
#define compat_start_thread(regs, ip, usp) do { \
regs->pc = ptr_to_compat_reg((void *)(ip)); \
regs->sp = ptr_to_compat_reg((void *)(usp)); \
+ single_step_execve(); \
} while (0)
/*
{
regs->pc = pc;
regs->sp = usp;
+ single_step_execve();
}
/* Free all resources held by a thread. */
#define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA)
#define task_pt_regs(task) \
((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
+#define current_pt_regs() \
+ ((struct pt_regs *)((stack_pointer | (THREAD_SIZE - 1)) - \
+ (KSTK_PTREGS_GAP - 1)) - 1)
#define task_sp(task) (task_pt_regs(task)->sp)
#define task_pc(task) (task_pt_regs(task)->pc)
/* Aliases for pc and sp (used in fs/proc/array.c) */
/* Support function for forking a new task. */
void ret_from_fork(void);
-/* Called from ret_from_fork() when a new process starts up. */
+/* Support function for forking a new kernel thread. */
+void ret_from_kernel_thread(void *fn, void *arg);
+
+/* Called from ret_from_xxx() when a new process starts up. */
struct task_struct *sim_notify_fork(struct task_struct *prev);
#endif /* !__ASSEMBLY__ */
#ifndef __tilegx__
/* mm/fault.c */
-long sys_cmpxchg_badaddr(unsigned long address, struct pt_regs *);
-long _sys_cmpxchg_badaddr(unsigned long address);
+long sys_cmpxchg_badaddr(unsigned long address);
#endif
#ifdef CONFIG_COMPAT
long sys_ftruncate64(unsigned int fd, loff_t length);
#endif
+/* Provide versions of standard syscalls that use current_pt_regs(). */
+long sys_clone(unsigned long clone_flags, unsigned long newsp,
+ void __user *parent_tid, void __user *child_tid);
+long sys_execve(const char __user *filename,
+ const char __user *const __user *argv,
+ const char __user *const __user *envp);
+long sys_rt_sigreturn(void);
+long sys_sigaltstack(const stack_t __user *, stack_t __user *);
+#define sys_clone sys_clone
+#define sys_execve sys_execve
+#define sys_rt_sigreturn sys_rt_sigreturn
+#define sys_sigaltstack sys_sigaltstack
+
/* These are the intvec*.S trampolines. */
-long _sys_sigaltstack(const stack_t __user *, stack_t __user *);
long _sys_rt_sigreturn(void);
long _sys_clone(unsigned long clone_flags, unsigned long newsp,
void __user *parent_tid, void __user *child_tid);
-long _sys_execve(const char __user *filename,
- const char __user *const __user *argv,
- const char __user *const __user *envp);
#include <asm-generic/syscalls.h>
#define __ARCH_WANT_SYS_LLSEEK
#endif
#define __ARCH_WANT_SYS_NEWFSTATAT
+#define __ARCH_WANT_SYS_EXECVE
#include <uapi/asm/unistd.h>
#define compat_sys_fadvise64_64 sys32_fadvise64_64
#define compat_sys_readahead sys32_readahead
-/* Call the trampolines to manage pt_regs where necessary. */
-#define compat_sys_execve _compat_sys_execve
-#define compat_sys_sigaltstack _compat_sys_sigaltstack
+/* Call the assembly trampolines where necessary. */
#define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
+#undef sys_clone
#define sys_clone _sys_clone
/*
}
long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
- struct compat_sigaltstack __user *uoss_ptr,
- struct pt_regs *regs)
+ struct compat_sigaltstack __user *uoss_ptr)
{
stack_t uss, uoss;
int ret;
set_fs(KERNEL_DS);
ret = do_sigaltstack(uss_ptr ? (stack_t __user __force *)&uss : NULL,
(stack_t __user __force *)&uoss,
- (unsigned long)compat_ptr(regs->sp));
+ (unsigned long)compat_ptr(current_pt_regs()->sp));
set_fs(seg);
if (ret >= 0 && uoss_ptr) {
if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(*uoss_ptr)) ||
}
/* The assembly shim for this function arranges to ignore the return value. */
-long compat_sys_rt_sigreturn(struct pt_regs *regs)
+long compat_sys_rt_sigreturn(void)
{
+ struct pt_regs *regs = current_pt_regs();
struct compat_rt_sigframe __user *frame =
(struct compat_rt_sigframe __user *) compat_ptr(regs->sp);
sigset_t set;
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
- if (compat_sys_sigaltstack(&frame->uc.uc_stack, NULL, regs) != 0)
+ if (compat_sys_sigaltstack(&frame->uc.uc_stack, NULL) == -EFAULT)
goto badframe;
return 0;
{ move r0, lr; jrp lr }
STD_ENDPROC(current_text_addr)
-/*
- * Implement execve(). The i386 code has a note that forking from kernel
- * space results in no copy on write until the execve, so we should be
- * careful not to write to the stack here.
- */
-STD_ENTRY(kernel_execve)
- moveli TREG_SYSCALL_NR_NAME, __NR_execve
- swint1
- jrp lr
- STD_ENDPROC(kernel_execve)
-
/*
* We don't run this function directly, but instead copy it to a page
* we map into every user process. See vdso_setup().
}
STD_ENDPROC(ret_from_fork)
+STD_ENTRY(ret_from_kernel_thread)
+ jal sim_notify_fork
+ jal schedule_tail
+ FEEDBACK_REENTER(ret_from_fork)
+ {
+ move r0, r31
+ jalr r30
+ }
+ FEEDBACK_REENTER(ret_from_kernel_thread)
+ {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
+ STD_ENDPROC(ret_from_kernel_thread)
+
/*
* Code for ill interrupt.
*/
panic "Unhandled interrupt %#x: PC %#lx"
STD_ENDPROC(bad_intr)
-/* Put address of pt_regs in reg and jump. */
-#define PTREGS_SYSCALL(x, reg) \
- STD_ENTRY(_##x); \
- { \
- PTREGS_PTR(reg, PTREGS_OFFSET_BASE); \
- j x \
- }; \
- STD_ENDPROC(_##x)
-
/*
* Special-case sigreturn to not write r0 to the stack on return.
* This is technically more efficient, but it also avoids difficulties
}; \
STD_ENDPROC(_##x)
-PTREGS_SYSCALL(sys_execve, r3)
-PTREGS_SYSCALL(sys_sigaltstack, r2)
PTREGS_SYSCALL_SIGRETURN(sys_rt_sigreturn, r0)
-PTREGS_SYSCALL(sys_cmpxchg_badaddr, r1)
-/* Save additional callee-saves to pt_regs, put address in r4 and jump. */
+/* Save additional callee-saves to pt_regs and jump to standard function. */
STD_ENTRY(_sys_clone)
push_extra_callee_saves r4
j sys_clone
}
STD_ENDPROC(ret_from_fork)
+STD_ENTRY(ret_from_kernel_thread)
+ jal sim_notify_fork
+ jal schedule_tail
+ FEEDBACK_REENTER(ret_from_fork)
+ {
+ move r0, r31
+ jalr r30
+ }
+ FEEDBACK_REENTER(ret_from_kernel_thread)
+ {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
+ STD_ENDPROC(ret_from_kernel_thread)
+
/* Various stub interrupt handlers and syscall handlers */
STD_ENTRY_LOCAL(_kernel_double_fault)
panic "Unhandled interrupt %#x: PC %#lx"
STD_ENDPROC(bad_intr)
-/* Put address of pt_regs in reg and jump. */
-#define PTREGS_SYSCALL(x, reg) \
- STD_ENTRY(_##x); \
- { \
- PTREGS_PTR(reg, PTREGS_OFFSET_BASE); \
- j x \
- }; \
- STD_ENDPROC(_##x)
-
/*
* Special-case sigreturn to not write r0 to the stack on return.
* This is technically more efficient, but it also avoids difficulties
}; \
STD_ENDPROC(_##x)
-PTREGS_SYSCALL(sys_execve, r3)
-PTREGS_SYSCALL(sys_sigaltstack, r2)
PTREGS_SYSCALL_SIGRETURN(sys_rt_sigreturn, r0)
#ifdef CONFIG_COMPAT
-PTREGS_SYSCALL(compat_sys_execve, r3)
-PTREGS_SYSCALL(compat_sys_sigaltstack, r2)
PTREGS_SYSCALL_SIGRETURN(compat_sys_rt_sigreturn, r0)
#endif
-/* Save additional callee-saves to pt_regs, put address in r4 and jump. */
+/* Save additional callee-saves to pt_regs and jump to standard function. */
STD_ENTRY(_sys_clone)
push_extra_callee_saves r4
j sys_clone
static void save_arch_state(struct thread_struct *t);
int copy_thread(unsigned long clone_flags, unsigned long sp,
- unsigned long stack_size,
- struct task_struct *p, struct pt_regs *regs)
+ unsigned long arg,
+ struct task_struct *p, struct pt_regs *unused)
{
- struct pt_regs *childregs;
+ struct pt_regs *childregs = task_pt_regs(p);
unsigned long ksp;
+ unsigned long *callee_regs;
/*
- * When creating a new kernel thread we pass sp as zero.
- * Assign it to a reasonable value now that we have the stack.
+ * Set up the stack and stack pointer appropriately for the
+ * new child to find itself woken up in __switch_to().
+ * The callee-saved registers must be on the stack to be read;
+ * the new task will then jump to assembly support to handle
+ * calling schedule_tail(), etc., and (for userspace tasks)
+ * returning to the context set up in the pt_regs.
*/
- if (sp == 0 && regs->ex1 == PL_ICS_EX1(KERNEL_PL, 0))
- sp = KSTK_TOP(p);
+ ksp = (unsigned long) childregs;
+ ksp -= C_ABI_SAVE_AREA_SIZE; /* interrupt-entry save area */
+ ((long *)ksp)[0] = ((long *)ksp)[1] = 0;
+ ksp -= CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long);
+ callee_regs = (unsigned long *)ksp;
+ ksp -= C_ABI_SAVE_AREA_SIZE; /* __switch_to() save area */
+ ((long *)ksp)[0] = ((long *)ksp)[1] = 0;
+ p->thread.ksp = ksp;
- /*
- * Do not clone step state from the parent; each thread
- * must make its own lazily.
- */
- task_thread_info(p)->step_state = NULL;
+ /* Record the pid of the task that created this one. */
+ p->thread.creator_pid = current->pid;
+
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ /* kernel thread */
+ memset(childregs, 0, sizeof(struct pt_regs));
+ memset(&callee_regs[2], 0,
+ (CALLEE_SAVED_REGS_COUNT - 2) * sizeof(unsigned long));
+ callee_regs[0] = sp; /* r30 = function */
+ callee_regs[1] = arg; /* r31 = arg */
+ childregs->ex1 = PL_ICS_EX1(KERNEL_PL, 0);
+ p->thread.pc = (unsigned long) ret_from_kernel_thread;
+ return 0;
+ }
/*
* Start new thread in ret_from_fork so it schedules properly
*/
p->thread.pc = (unsigned long) ret_from_fork;
- /* Save user stack top pointer so we can ID the stack vm area later. */
- p->thread.usp0 = sp;
-
- /* Record the pid of the process that created this one. */
- p->thread.creator_pid = current->pid;
+ /*
+ * Do not clone step state from the parent; each thread
+ * must make its own lazily.
+ */
+ task_thread_info(p)->step_state = NULL;
/*
* Copy the registers onto the kernel stack so the
* return-from-interrupt code will reload it into registers.
*/
- childregs = task_pt_regs(p);
- *childregs = *regs;
+ *childregs = *current_pt_regs();
childregs->regs[0] = 0; /* return value is zero */
- childregs->sp = sp; /* override with new user stack pointer */
+ if (sp)
+ childregs->sp = sp; /* override with new user stack pointer */
+ memcpy(callee_regs, &childregs->regs[CALLEE_SAVED_FIRST_REG],
+ CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long));
+
+ /* Save user stack top pointer so we can ID the stack vm area later. */
+ p->thread.usp0 = childregs->sp;
/*
* If CLONE_SETTLS is set, set "tp" in the new task to "r4",
* which is passed in as arg #5 to sys_clone().
*/
if (clone_flags & CLONE_SETTLS)
- childregs->tp = regs->regs[4];
+ childregs->tp = childregs->regs[4];
- /*
- * Copy the callee-saved registers from the passed pt_regs struct
- * into the context-switch callee-saved registers area.
- * This way when we start the interrupt-return sequence, the
- * callee-save registers will be correctly in registers, which
- * is how we assume the compiler leaves them as we start doing
- * the normal return-from-interrupt path after calling C code.
- * Zero out the C ABI save area to mark the top of the stack.
- */
- ksp = (unsigned long) childregs;
- ksp -= C_ABI_SAVE_AREA_SIZE; /* interrupt-entry save area */
- ((long *)ksp)[0] = ((long *)ksp)[1] = 0;
- ksp -= CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long);
- memcpy((void *)ksp, ®s->regs[CALLEE_SAVED_FIRST_REG],
- CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long));
- ksp -= C_ABI_SAVE_AREA_SIZE; /* __switch_to() save area */
- ((long *)ksp)[0] = ((long *)ksp)[1] = 0;
- p->thread.ksp = ksp;
#if CHIP_HAS_TILE_DMA()
/*
}
/* Note there is an implicit fifth argument if (clone_flags & CLONE_SETTLS). */
-SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
- void __user *, parent_tidptr, void __user *, child_tidptr,
- struct pt_regs *, regs)
+SYSCALL_DEFINE4(clone, unsigned long, clone_flags, unsigned long, newsp,
+ void __user *, parent_tidptr, void __user *, child_tidptr)
{
- if (!newsp)
- newsp = regs->sp;
- return do_fork(clone_flags, newsp, regs, 0,
+ return do_fork(clone_flags, newsp, current_pt_regs(), 0,
parent_tidptr, child_tidptr);
}
-/*
- * sys_execve() executes a new program.
- */
-SYSCALL_DEFINE4(execve, const char __user *, path,
- const char __user *const __user *, argv,
- const char __user *const __user *, envp,
- struct pt_regs *, regs)
-{
- long error;
- struct filename *filename;
-
- filename = getname(path);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename->name, argv, envp, regs);
- putname(filename);
- if (error == 0)
- single_step_execve();
-out:
- return error;
-}
-
-#ifdef CONFIG_COMPAT
-long compat_sys_execve(const char __user *path,
- compat_uptr_t __user *argv,
- compat_uptr_t __user *envp,
- struct pt_regs *regs)
-{
- long error;
- struct filename *filename;
-
- filename = getname(path);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = compat_do_execve(filename->name, argv, envp, regs);
- putname(filename);
- if (error == 0)
- single_step_execve();
-out:
- return error;
-}
-#endif
-
unsigned long get_wchan(struct task_struct *p)
{
struct KBacktraceIterator kbt;
return 0;
}
-/*
- * We pass in lr as zero (cleared in kernel_thread) and the caller
- * part of the backtrace ABI on the stack also zeroed (in copy_thread)
- * so that backtraces will stop with this function.
- * Note that we don't use r0, since copy_thread() clears it.
- */
-static void start_kernel_thread(int dummy, int (*fn)(int), int arg)
-{
- do_exit(fn(arg));
-}
-
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
- regs.ex1 = PL_ICS_EX1(KERNEL_PL, 0); /* run at kernel PL, no ICS */
- regs.pc = (long) start_kernel_thread;
- regs.flags = PT_FLAGS_CALLER_SAVES; /* need to restore r1 and r2 */
- regs.regs[1] = (long) fn; /* function pointer */
- regs.regs[2] = (long) arg; /* parameter register */
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s,
- 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/* Flush thread state. */
void flush_thread(void)
{
#define DEBUG_SIG 0
-SYSCALL_DEFINE3(sigaltstack, const stack_t __user *, uss,
- stack_t __user *, uoss, struct pt_regs *, regs)
+SYSCALL_DEFINE2(sigaltstack, const stack_t __user *, uss,
+ stack_t __user *, uoss)
{
- return do_sigaltstack(uss, uoss, regs->sp);
+ return do_sigaltstack(uss, uoss, current_pt_regs()->sp);
}
}
/* The assembly shim for this function arranges to ignore the return value. */
-SYSCALL_DEFINE1(rt_sigreturn, struct pt_regs *, regs)
+SYSCALL_DEFINE0(rt_sigreturn)
{
+ struct pt_regs *regs = current_pt_regs();
struct rt_sigframe __user *frame =
(struct rt_sigframe __user *)(regs->sp);
sigset_t set;
#define sys_readahead sys32_readahead
#endif
-/* Call the trampolines to manage pt_regs where necessary. */
-#define sys_execve _sys_execve
-#define sys_sigaltstack _sys_sigaltstack
+/* Call the assembly trampolines where necessary. */
+#undef sys_rt_sigreturn
#define sys_rt_sigreturn _sys_rt_sigreturn
+#undef sys_clone
#define sys_clone _sys_clone
-#ifndef __tilegx__
-#define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr
-#endif
/*
* Note that we can't include <linux/unistd.h> here since the header
* Synthesize the fault a PL0 process would get by doing a word-load of
* an unaligned address or a high kernel address.
*/
-SYSCALL_DEFINE2(cmpxchg_badaddr, unsigned long, address,
- struct pt_regs *, regs)
+SYSCALL_DEFINE1(cmpxchg_badaddr, unsigned long, address)
{
+ struct pt_regs *regs = current_pt_regs();
+
if (address >= PAGE_OFFSET)
force_sig_info_fault("atomic segfault", SIGSEGV, SEGV_MAPERR,
address, INT_DTLB_MISS, current, regs);
int compat_do_execve(const char *filename, const compat_uptr_t __user *argv,
const compat_uptr_t __user *envp, struct pt_regs *regs);
-#ifdef __ARCH_WANT_SYS_EXECVE
asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
const compat_uptr_t __user *envp);
-#endif
asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp,
projects / cascardo / linux.git / commitdiff