2 * linux/arch/m68k/kernel/ptrace.c
4 * Copyright (C) 1994 by Hamish Macdonald
5 * Taken from linux/kernel/ptrace.c and modified for M680x0.
6 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of
10 * this archive for more details.
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/errno.h>
18 #include <linux/ptrace.h>
19 #include <linux/user.h>
20 #include <linux/signal.h>
21 #include <linux/tracehook.h>
23 #include <asm/uaccess.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
30 * does not yet catch signals sent when the child dies.
31 * in exit.c or in signal.c.
34 /* determines which bits in the SR the user has access to. */
35 /* 1 = access 0 = no access */
36 #define SR_MASK 0x001f
38 /* sets the trace bits. */
39 #define TRACE_BITS 0xC000
43 /* Find the stack offset for a register, relative to thread.esp0. */
44 #define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
45 #define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
46 - sizeof(struct switch_stack))
47 /* Mapping from PT_xxx to the stack offset at which the register is
48 saved. Notice that usp has no stack-slot and needs to be treated
49 specially (see get_reg/put_reg below). */
50 static const int regoff[] = {
67 [16] = PT_REG(orig_d0),
73 * Get contents of register REGNO in task TASK.
75 static inline long get_reg(struct task_struct *task, int regno)
80 addr = &task->thread.usp;
81 else if (regno < ARRAY_SIZE(regoff))
82 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
85 /* Need to take stkadj into account. */
86 if (regno == PT_SR || regno == PT_PC) {
87 long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
88 addr = (unsigned long *) ((unsigned long)addr + stkadj);
89 /* The sr is actually a 16 bit register. */
91 return *(unsigned short *)addr;
97 * Write contents of register REGNO in task TASK.
99 static inline int put_reg(struct task_struct *task, int regno,
105 addr = &task->thread.usp;
106 else if (regno < ARRAY_SIZE(regoff))
107 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
110 /* Need to take stkadj into account. */
111 if (regno == PT_SR || regno == PT_PC) {
112 long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
113 addr = (unsigned long *) ((unsigned long)addr + stkadj);
114 /* The sr is actually a 16 bit register. */
115 if (regno == PT_SR) {
116 *(unsigned short *)addr = data;
125 * Make sure the single step bit is not set.
127 static inline void singlestep_disable(struct task_struct *child)
129 unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
130 put_reg(child, PT_SR, tmp);
131 clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
135 * Called by kernel/ptrace.c when detaching..
137 void ptrace_disable(struct task_struct *child)
139 singlestep_disable(child);
142 void user_enable_single_step(struct task_struct *child)
144 unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
145 put_reg(child, PT_SR, tmp | T1_BIT);
146 set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
149 void user_enable_block_step(struct task_struct *child)
151 unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
152 put_reg(child, PT_SR, tmp | T0_BIT);
155 void user_disable_single_step(struct task_struct *child)
157 singlestep_disable(child);
160 long arch_ptrace(struct task_struct *child, long request,
161 unsigned long addr, unsigned long data)
165 int regno = addr >> 2; /* temporary hack. */
166 unsigned long __user *datap = (unsigned long __user *) data;
169 /* read the word at location addr in the USER area. */
174 if (regno >= 0 && regno < 19) {
175 tmp = get_reg(child, regno);
176 } else if (regno >= 21 && regno < 49) {
177 tmp = child->thread.fp[regno - 21];
178 /* Convert internal fpu reg representation
179 * into long double format
181 if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
182 tmp = ((tmp & 0xffff0000) << 15) |
183 ((tmp & 0x0000ffff) << 16);
186 ret = put_user(tmp, datap);
190 /* write the word at location addr in the USER area */
194 if (regno == PT_SR) {
196 data |= get_reg(child, PT_SR) & ~SR_MASK;
198 if (regno >= 0 && regno < 19) {
199 if (put_reg(child, regno, data))
201 } else if (regno >= 21 && regno < 48) {
202 /* Convert long double format
203 * into internal fpu reg representation
205 if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
207 data = (data & 0xffff0000) |
208 ((data & 0x0000ffff) >> 1);
210 child->thread.fp[regno - 21] = data;
215 case PTRACE_GETREGS: /* Get all gp regs from the child. */
216 for (i = 0; i < 19; i++) {
217 tmp = get_reg(child, i);
218 ret = put_user(tmp, datap);
225 case PTRACE_SETREGS: /* Set all gp regs in the child. */
226 for (i = 0; i < 19; i++) {
227 ret = get_user(tmp, datap);
232 tmp |= get_reg(child, PT_SR) & ~SR_MASK;
234 put_reg(child, i, tmp);
239 case PTRACE_GETFPREGS: /* Get the child FPU state. */
240 if (copy_to_user(datap, &child->thread.fp,
241 sizeof(struct user_m68kfp_struct)))
245 case PTRACE_SETFPREGS: /* Set the child FPU state. */
246 if (copy_from_user(&child->thread.fp, datap,
247 sizeof(struct user_m68kfp_struct)))
251 case PTRACE_GET_THREAD_AREA:
252 ret = put_user(task_thread_info(child)->tp_value, datap);
256 ret = ptrace_request(child, request, addr, data);
265 asmlinkage void syscall_trace(void)
267 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
270 * this isn't the same as continuing with a signal, but it will do
271 * for normal use. strace only continues with a signal if the
272 * stopping signal is not SIGTRAP. -brl
274 if (current->exit_code) {
275 send_sig(current->exit_code, current, 1);
276 current->exit_code = 0;
280 #ifdef CONFIG_COLDFIRE
281 asmlinkage int syscall_trace_enter(void)
285 if (test_thread_flag(TIF_SYSCALL_TRACE))
286 ret = tracehook_report_syscall_entry(task_pt_regs(current));
290 asmlinkage void syscall_trace_leave(void)
292 if (test_thread_flag(TIF_SYSCALL_TRACE))
293 tracehook_report_syscall_exit(task_pt_regs(current), 0);
295 #endif /* CONFIG_COLDFIRE */