--- /dev/null
-#ifdef CONFIG_CC_STACKPROTECTOR
+ #ifndef _ASM_X86_PDA_H
+ #define _ASM_X86_PDA_H
+
+ #ifndef __ASSEMBLY__
+ #include <linux/stddef.h>
+ #include <linux/types.h>
+ #include <linux/cache.h>
+ #include <asm/page.h>
+
+ /* Per processor datastructure. %gs points to it while the kernel runs */
+ struct x8664_pda {
+ struct task_struct *pcurrent; /* 0 Current process */
+ unsigned long data_offset; /* 8 Per cpu data offset from linker
+ address */
+ unsigned long kernelstack; /* 16 top of kernel stack for current */
+ unsigned long oldrsp; /* 24 user rsp for system call */
+ int irqcount; /* 32 Irq nesting counter. Starts -1 */
+ unsigned int cpunumber; /* 36 Logical CPU number */
-#endif
+ unsigned long stack_canary; /* 40 stack canary value */
+ /* gcc-ABI: this canary MUST be at
+ offset 40!!! */
+ char *irqstackptr;
+ short nodenumber; /* number of current node (32k max) */
+ short in_bootmem; /* pda lives in bootmem */
+ unsigned int __softirq_pending;
+ unsigned int __nmi_count; /* number of NMI on this CPUs */
+ short mmu_state;
+ short isidle;
+ struct mm_struct *active_mm;
+ unsigned apic_timer_irqs;
+ unsigned irq0_irqs;
+ unsigned irq_resched_count;
+ unsigned irq_call_count;
+ unsigned irq_tlb_count;
+ unsigned irq_thermal_count;
+ unsigned irq_threshold_count;
+ unsigned irq_spurious_count;
+ } ____cacheline_aligned_in_smp;
+
+ extern struct x8664_pda **_cpu_pda;
+ extern void pda_init(int);
+
+ #define cpu_pda(i) (_cpu_pda[i])
+
+ /*
+ * There is no fast way to get the base address of the PDA, all the accesses
+ * have to mention %fs/%gs. So it needs to be done this Torvaldian way.
+ */
+ extern void __bad_pda_field(void) __attribute__((noreturn));
+
+ /*
+ * proxy_pda doesn't actually exist, but tell gcc it is accessed for
+ * all PDA accesses so it gets read/write dependencies right.
+ */
+ extern struct x8664_pda _proxy_pda;
+
+ #define pda_offset(field) offsetof(struct x8664_pda, field)
+
+ #define pda_to_op(op, field, val) \
+ do { \
+ typedef typeof(_proxy_pda.field) T__; \
+ if (0) { T__ tmp__; tmp__ = (val); } /* type checking */ \
+ switch (sizeof(_proxy_pda.field)) { \
+ case 2: \
+ asm(op "w %1,%%gs:%c2" : \
+ "+m" (_proxy_pda.field) : \
+ "ri" ((T__)val), \
+ "i"(pda_offset(field))); \
+ break; \
+ case 4: \
+ asm(op "l %1,%%gs:%c2" : \
+ "+m" (_proxy_pda.field) : \
+ "ri" ((T__)val), \
+ "i" (pda_offset(field))); \
+ break; \
+ case 8: \
+ asm(op "q %1,%%gs:%c2": \
+ "+m" (_proxy_pda.field) : \
+ "ri" ((T__)val), \
+ "i"(pda_offset(field))); \
+ break; \
+ default: \
+ __bad_pda_field(); \
+ } \
+ } while (0)
+
+ #define pda_from_op(op, field) \
+ ({ \
+ typeof(_proxy_pda.field) ret__; \
+ switch (sizeof(_proxy_pda.field)) { \
+ case 2: \
+ asm(op "w %%gs:%c1,%0" : \
+ "=r" (ret__) : \
+ "i" (pda_offset(field)), \
+ "m" (_proxy_pda.field)); \
+ break; \
+ case 4: \
+ asm(op "l %%gs:%c1,%0": \
+ "=r" (ret__): \
+ "i" (pda_offset(field)), \
+ "m" (_proxy_pda.field)); \
+ break; \
+ case 8: \
+ asm(op "q %%gs:%c1,%0": \
+ "=r" (ret__) : \
+ "i" (pda_offset(field)), \
+ "m" (_proxy_pda.field)); \
+ break; \
+ default: \
+ __bad_pda_field(); \
+ } \
+ ret__; \
+ })
+
+ #define read_pda(field) pda_from_op("mov", field)
+ #define write_pda(field, val) pda_to_op("mov", field, val)
+ #define add_pda(field, val) pda_to_op("add", field, val)
+ #define sub_pda(field, val) pda_to_op("sub", field, val)
+ #define or_pda(field, val) pda_to_op("or", field, val)
+
+ /* This is not atomic against other CPUs -- CPU preemption needs to be off */
+ #define test_and_clear_bit_pda(bit, field) \
+ ({ \
+ int old__; \
+ asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0" \
+ : "=r" (old__), "+m" (_proxy_pda.field) \
+ : "dIr" (bit), "i" (pda_offset(field)) : "memory");\
+ old__; \
+ })
+
+ #endif
+
+ #define PDA_STACKOFFSET (5*8)
+
++#define refresh_stack_canary() write_pda(stack_canary, current->stack_canary)
++
+ #endif /* _ASM_X86_PDA_H */
--- /dev/null
- [pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent)) \
+ #ifndef _ASM_X86_SYSTEM_H
+ #define _ASM_X86_SYSTEM_H
+
+ #include <asm/asm.h>
+ #include <asm/segment.h>
+ #include <asm/cpufeature.h>
+ #include <asm/cmpxchg.h>
+ #include <asm/nops.h>
+
+ #include <linux/kernel.h>
+ #include <linux/irqflags.h>
+
+ /* entries in ARCH_DLINFO: */
+ #ifdef CONFIG_IA32_EMULATION
+ # define AT_VECTOR_SIZE_ARCH 2
+ #else
+ # define AT_VECTOR_SIZE_ARCH 1
+ #endif
+
+ struct task_struct; /* one of the stranger aspects of C forward declarations */
+ struct task_struct *__switch_to(struct task_struct *prev,
+ struct task_struct *next);
+
+ #ifdef CONFIG_X86_32
+
+ /*
+ * Saving eflags is important. It switches not only IOPL between tasks,
+ * it also protects other tasks from NT leaking through sysenter etc.
+ */
+ #define switch_to(prev, next, last) \
+ do { \
+ /* \
+ * Context-switching clobbers all registers, so we clobber \
+ * them explicitly, via unused output variables. \
+ * (EAX and EBP is not listed because EBP is saved/restored \
+ * explicitly for wchan access and EAX is the return value of \
+ * __switch_to()) \
+ */ \
+ unsigned long ebx, ecx, edx, esi, edi; \
+ \
+ asm volatile("pushfl\n\t" /* save flags */ \
+ "pushl %%ebp\n\t" /* save EBP */ \
+ "movl %%esp,%[prev_sp]\n\t" /* save ESP */ \
+ "movl %[next_sp],%%esp\n\t" /* restore ESP */ \
+ "movl $1f,%[prev_ip]\n\t" /* save EIP */ \
+ "pushl %[next_ip]\n\t" /* restore EIP */ \
+ "jmp __switch_to\n" /* regparm call */ \
+ "1:\t" \
+ "popl %%ebp\n\t" /* restore EBP */ \
+ "popfl\n" /* restore flags */ \
+ \
+ /* output parameters */ \
+ : [prev_sp] "=m" (prev->thread.sp), \
+ [prev_ip] "=m" (prev->thread.ip), \
+ "=a" (last), \
+ \
+ /* clobbered output registers: */ \
+ "=b" (ebx), "=c" (ecx), "=d" (edx), \
+ "=S" (esi), "=D" (edi) \
+ \
+ /* input parameters: */ \
+ : [next_sp] "m" (next->thread.sp), \
+ [next_ip] "m" (next->thread.ip), \
+ \
+ /* regparm parameters for __switch_to(): */ \
+ [prev] "a" (prev), \
+ [next] "d" (next) \
+ \
+ : /* reloaded segment registers */ \
+ "memory"); \
+ } while (0)
+
+ /*
+ * disable hlt during certain critical i/o operations
+ */
+ #define HAVE_DISABLE_HLT
+ #else
+ #define __SAVE(reg, offset) "movq %%" #reg ",(14-" #offset ")*8(%%rsp)\n\t"
+ #define __RESTORE(reg, offset) "movq (14-" #offset ")*8(%%rsp),%%" #reg "\n\t"
+
+ /* frame pointer must be last for get_wchan */
+ #define SAVE_CONTEXT "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"
+ #define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"
+
+ #define __EXTRA_CLOBBER \
+ , "rcx", "rbx", "rdx", "r8", "r9", "r10", "r11", \
+ "r12", "r13", "r14", "r15"
+
+ /* Save restore flags to clear handle leaking NT */
+ #define switch_to(prev, next, last) \
+ asm volatile(SAVE_CONTEXT \
+ "movq %%rsp,%P[threadrsp](%[prev])\n\t" /* save RSP */ \
+ "movq %P[threadrsp](%[next]),%%rsp\n\t" /* restore RSP */ \
+ "call __switch_to\n\t" \
+ ".globl thread_return\n" \
+ "thread_return:\n\t" \
+ "movq %%gs:%P[pda_pcurrent],%%rsi\n\t" \
++ "movq %P[task_canary](%%rsi),%%r8\n\t" \
++ "movq %%r8,%%gs:%P[pda_canary]\n\t" \
+ "movq %P[thread_info](%%rsi),%%r8\n\t" \
+ LOCK_PREFIX "btr %[tif_fork],%P[ti_flags](%%r8)\n\t" \
+ "movq %%rax,%%rdi\n\t" \
+ "jc ret_from_fork\n\t" \
+ RESTORE_CONTEXT \
+ : "=a" (last) \
+ : [next] "S" (next), [prev] "D" (prev), \
+ [threadrsp] "i" (offsetof(struct task_struct, thread.sp)), \
+ [ti_flags] "i" (offsetof(struct thread_info, flags)), \
+ [tif_fork] "i" (TIF_FORK), \
+ [thread_info] "i" (offsetof(struct task_struct, stack)), \
++ [task_canary] "i" (offsetof(struct task_struct, stack_canary)),\
++ [pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent)), \
++ [pda_canary] "i" (offsetof(struct x8664_pda, stack_canary))\
+ : "memory", "cc" __EXTRA_CLOBBER)
+ #endif
+
+ #ifdef __KERNEL__
+ #define _set_base(addr, base) do { unsigned long __pr; \
+ __asm__ __volatile__ ("movw %%dx,%1\n\t" \
+ "rorl $16,%%edx\n\t" \
+ "movb %%dl,%2\n\t" \
+ "movb %%dh,%3" \
+ :"=&d" (__pr) \
+ :"m" (*((addr)+2)), \
+ "m" (*((addr)+4)), \
+ "m" (*((addr)+7)), \
+ "0" (base) \
+ ); } while (0)
+
+ #define _set_limit(addr, limit) do { unsigned long __lr; \
+ __asm__ __volatile__ ("movw %%dx,%1\n\t" \
+ "rorl $16,%%edx\n\t" \
+ "movb %2,%%dh\n\t" \
+ "andb $0xf0,%%dh\n\t" \
+ "orb %%dh,%%dl\n\t" \
+ "movb %%dl,%2" \
+ :"=&d" (__lr) \
+ :"m" (*(addr)), \
+ "m" (*((addr)+6)), \
+ "0" (limit) \
+ ); } while (0)
+
+ #define set_base(ldt, base) _set_base(((char *)&(ldt)) , (base))
+ #define set_limit(ldt, limit) _set_limit(((char *)&(ldt)) , ((limit)-1))
+
+ extern void native_load_gs_index(unsigned);
+
+ /*
+ * Load a segment. Fall back on loading the zero
+ * segment if something goes wrong..
+ */
+ #define loadsegment(seg, value) \
+ asm volatile("\n" \
+ "1:\t" \
+ "movl %k0,%%" #seg "\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\t" \
+ "movl %k1, %%" #seg "\n\t" \
+ "jmp 2b\n" \
+ ".previous\n" \
+ _ASM_EXTABLE(1b,3b) \
+ : :"r" (value), "r" (0) : "memory")
+
+
+ /*
+ * Save a segment register away
+ */
+ #define savesegment(seg, value) \
+ asm("mov %%" #seg ",%0":"=r" (value) : : "memory")
+
+ static inline unsigned long get_limit(unsigned long segment)
+ {
+ unsigned long __limit;
+ asm("lsll %1,%0" : "=r" (__limit) : "r" (segment));
+ return __limit + 1;
+ }
+
+ static inline void native_clts(void)
+ {
+ asm volatile("clts");
+ }
+
+ /*
+ * Volatile isn't enough to prevent the compiler from reordering the
+ * read/write functions for the control registers and messing everything up.
+ * A memory clobber would solve the problem, but would prevent reordering of
+ * all loads stores around it, which can hurt performance. Solution is to
+ * use a variable and mimic reads and writes to it to enforce serialization
+ */
+ static unsigned long __force_order;
+
+ static inline unsigned long native_read_cr0(void)
+ {
+ unsigned long val;
+ asm volatile("mov %%cr0,%0\n\t" : "=r" (val), "=m" (__force_order));
+ return val;
+ }
+
+ static inline void native_write_cr0(unsigned long val)
+ {
+ asm volatile("mov %0,%%cr0": : "r" (val), "m" (__force_order));
+ }
+
+ static inline unsigned long native_read_cr2(void)
+ {
+ unsigned long val;
+ asm volatile("mov %%cr2,%0\n\t" : "=r" (val), "=m" (__force_order));
+ return val;
+ }
+
+ static inline void native_write_cr2(unsigned long val)
+ {
+ asm volatile("mov %0,%%cr2": : "r" (val), "m" (__force_order));
+ }
+
+ static inline unsigned long native_read_cr3(void)
+ {
+ unsigned long val;
+ asm volatile("mov %%cr3,%0\n\t" : "=r" (val), "=m" (__force_order));
+ return val;
+ }
+
+ static inline void native_write_cr3(unsigned long val)
+ {
+ asm volatile("mov %0,%%cr3": : "r" (val), "m" (__force_order));
+ }
+
+ static inline unsigned long native_read_cr4(void)
+ {
+ unsigned long val;
+ asm volatile("mov %%cr4,%0\n\t" : "=r" (val), "=m" (__force_order));
+ return val;
+ }
+
+ static inline unsigned long native_read_cr4_safe(void)
+ {
+ unsigned long val;
+ /* This could fault if %cr4 does not exist. In x86_64, a cr4 always
+ * exists, so it will never fail. */
+ #ifdef CONFIG_X86_32
+ asm volatile("1: mov %%cr4, %0\n"
+ "2:\n"
+ _ASM_EXTABLE(1b, 2b)
+ : "=r" (val), "=m" (__force_order) : "0" (0));
+ #else
+ val = native_read_cr4();
+ #endif
+ return val;
+ }
+
+ static inline void native_write_cr4(unsigned long val)
+ {
+ asm volatile("mov %0,%%cr4": : "r" (val), "m" (__force_order));
+ }
+
+ #ifdef CONFIG_X86_64
+ static inline unsigned long native_read_cr8(void)
+ {
+ unsigned long cr8;
+ asm volatile("movq %%cr8,%0" : "=r" (cr8));
+ return cr8;
+ }
+
+ static inline void native_write_cr8(unsigned long val)
+ {
+ asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
+ }
+ #endif
+
+ static inline void native_wbinvd(void)
+ {
+ asm volatile("wbinvd": : :"memory");
+ }
+
+ #ifdef CONFIG_PARAVIRT
+ #include <asm/paravirt.h>
+ #else
+ #define read_cr0() (native_read_cr0())
+ #define write_cr0(x) (native_write_cr0(x))
+ #define read_cr2() (native_read_cr2())
+ #define write_cr2(x) (native_write_cr2(x))
+ #define read_cr3() (native_read_cr3())
+ #define write_cr3(x) (native_write_cr3(x))
+ #define read_cr4() (native_read_cr4())
+ #define read_cr4_safe() (native_read_cr4_safe())
+ #define write_cr4(x) (native_write_cr4(x))
+ #define wbinvd() (native_wbinvd())
+ #ifdef CONFIG_X86_64
+ #define read_cr8() (native_read_cr8())
+ #define write_cr8(x) (native_write_cr8(x))
+ #define load_gs_index native_load_gs_index
+ #endif
+
+ /* Clear the 'TS' bit */
+ #define clts() (native_clts())
+
+ #endif/* CONFIG_PARAVIRT */
+
+ #define stts() write_cr0(read_cr0() | X86_CR0_TS)
+
+ #endif /* __KERNEL__ */
+
+ static inline void clflush(volatile void *__p)
+ {
+ asm volatile("clflush %0" : "+m" (*(volatile char __force *)__p));
+ }
+
+ #define nop() asm volatile ("nop")
+
+ void disable_hlt(void);
+ void enable_hlt(void);
+
+ void cpu_idle_wait(void);
+
+ extern unsigned long arch_align_stack(unsigned long sp);
+ extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
+
+ void default_idle(void);
+
+ void stop_this_cpu(void *dummy);
+
+ /*
+ * Force strict CPU ordering.
+ * And yes, this is required on UP too when we're talking
+ * to devices.
+ */
+ #ifdef CONFIG_X86_32
+ /*
+ * Some non-Intel clones support out of order store. wmb() ceases to be a
+ * nop for these.
+ */
+ #define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
+ #define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
+ #define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
+ #else
+ #define mb() asm volatile("mfence":::"memory")
+ #define rmb() asm volatile("lfence":::"memory")
+ #define wmb() asm volatile("sfence" ::: "memory")
+ #endif
+
+ /**
+ * read_barrier_depends - Flush all pending reads that subsequents reads
+ * depend on.
+ *
+ * No data-dependent reads from memory-like regions are ever reordered
+ * over this barrier. All reads preceding this primitive are guaranteed
+ * to access memory (but not necessarily other CPUs' caches) before any
+ * reads following this primitive that depend on the data return by
+ * any of the preceding reads. This primitive is much lighter weight than
+ * rmb() on most CPUs, and is never heavier weight than is
+ * rmb().
+ *
+ * These ordering constraints are respected by both the local CPU
+ * and the compiler.
+ *
+ * Ordering is not guaranteed by anything other than these primitives,
+ * not even by data dependencies. See the documentation for
+ * memory_barrier() for examples and URLs to more information.
+ *
+ * For example, the following code would force ordering (the initial
+ * value of "a" is zero, "b" is one, and "p" is "&a"):
+ *
+ * <programlisting>
+ * CPU 0 CPU 1
+ *
+ * b = 2;
+ * memory_barrier();
+ * p = &b; q = p;
+ * read_barrier_depends();
+ * d = *q;
+ * </programlisting>
+ *
+ * because the read of "*q" depends on the read of "p" and these
+ * two reads are separated by a read_barrier_depends(). However,
+ * the following code, with the same initial values for "a" and "b":
+ *
+ * <programlisting>
+ * CPU 0 CPU 1
+ *
+ * a = 2;
+ * memory_barrier();
+ * b = 3; y = b;
+ * read_barrier_depends();
+ * x = a;
+ * </programlisting>
+ *
+ * does not enforce ordering, since there is no data dependency between
+ * the read of "a" and the read of "b". Therefore, on some CPUs, such
+ * as Alpha, "y" could be set to 3 and "x" to 0. Use rmb()
+ * in cases like this where there are no data dependencies.
+ **/
+
+ #define read_barrier_depends() do { } while (0)
+
+ #ifdef CONFIG_SMP
+ #define smp_mb() mb()
+ #ifdef CONFIG_X86_PPRO_FENCE
+ # define smp_rmb() rmb()
+ #else
+ # define smp_rmb() barrier()
+ #endif
+ #ifdef CONFIG_X86_OOSTORE
+ # define smp_wmb() wmb()
+ #else
+ # define smp_wmb() barrier()
+ #endif
+ #define smp_read_barrier_depends() read_barrier_depends()
+ #define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
+ #else
+ #define smp_mb() barrier()
+ #define smp_rmb() barrier()
+ #define smp_wmb() barrier()
+ #define smp_read_barrier_depends() do { } while (0)
+ #define set_mb(var, value) do { var = value; barrier(); } while (0)
+ #endif
+
+ /*
+ * Stop RDTSC speculation. This is needed when you need to use RDTSC
+ * (or get_cycles or vread that possibly accesses the TSC) in a defined
+ * code region.
+ *
+ * (Could use an alternative three way for this if there was one.)
+ */
+ static inline void rdtsc_barrier(void)
+ {
+ alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC);
+ alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
+ }
+
+ #endif /* _ASM_X86_SYSTEM_H */
projects / cascardo / linux.git / commitdiff