LXR linux/arch/sh/include/asm/ptrace.h

   1/*
   2 * Copyright (C) 1999, 2000  Niibe Yutaka
   3 */
   4#ifndef __ASM_SH_PTRACE_H
   5#define __ASM_SH_PTRACE_H
   6
   7
   8#include <linux/stringify.h>
   9#include <linux/stddef.h>
  10#include <linux/thread_info.h>
  11#include <asm/addrspace.h>
  12#include <asm/page.h>
  13#include <uapi/asm/ptrace.h>
  14
  15#define user_mode(regs)                 (((regs)->sr & 0x40000000)==0)
  16#define kernel_stack_pointer(_regs)     ((unsigned long)(_regs)->regs[15])
  17
  18#define GET_FP(regs)    ((regs)->regs[14])
  19#define GET_USP(regs)   ((regs)->regs[15])
  20
  21#define arch_has_single_step()  (1)
  22
  23/*
  24 * kprobe-based event tracer support
  25 */
  26struct pt_regs_offset {
  27        const char *name;
  28        int offset;
  29};
  30
  31#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
  32#define REGS_OFFSET_NAME(num)   \
  33        {.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])}
  34#define TREGS_OFFSET_NAME(num)  \
  35        {.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])}
  36#define REG_OFFSET_END {.name = NULL, .offset = 0}
  37
  38/* Query offset/name of register from its name/offset */
  39extern int regs_query_register_offset(const char *name);
  40extern const char *regs_query_register_name(unsigned int offset);
  41
  42extern const struct pt_regs_offset regoffset_table[];
  43
  44/**
  45 * regs_get_register() - get register value from its offset
  46 * @regs:       pt_regs from which register value is gotten.
  47 * @offset:     offset number of the register.
  48 *
  49 * regs_get_register returns the value of a register. The @offset is the
  50 * offset of the register in struct pt_regs address which specified by @regs.
  51 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
  52 */
  53static inline unsigned long regs_get_register(struct pt_regs *regs,
  54                                              unsigned int offset)
  55{
  56        if (unlikely(offset > MAX_REG_OFFSET))
  57                return 0;
  58        return *(unsigned long *)((unsigned long)regs + offset);
  59}
  60
  61/**
  62 * regs_within_kernel_stack() - check the address in the stack
  63 * @regs:       pt_regs which contains kernel stack pointer.
  64 * @addr:       address which is checked.
  65 *
  66 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
  67 * If @addr is within the kernel stack, it returns true. If not, returns false.
  68 */
  69static inline int regs_within_kernel_stack(struct pt_regs *regs,
  70                                           unsigned long addr)
  71{
  72        return ((addr & ~(THREAD_SIZE - 1))  ==
  73                (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
  74}
  75
  76/**
  77 * regs_get_kernel_stack_nth() - get Nth entry of the stack
  78 * @regs:       pt_regs which contains kernel stack pointer.
  79 * @n:          stack entry number.
  80 *
  81 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
  82 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
  83 * this returns 0.
  84 */
  85static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
  86                                                      unsigned int n)
  87{
  88        unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
  89        addr += n;
  90        if (regs_within_kernel_stack(regs, (unsigned long)addr))
  91                return *addr;
  92        else
  93                return 0;
  94}
  95
  96struct perf_event;
  97struct perf_sample_data;
  98
  99extern void ptrace_triggered(struct perf_event *bp,
 100                      struct perf_sample_data *data, struct pt_regs *regs);
 101
 102#define task_pt_regs(task) \
 103        ((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE) - 1)
 104
 105static inline unsigned long profile_pc(struct pt_regs *regs)
 106{
 107        unsigned long pc = regs->pc;
 108
 109        if (virt_addr_uncached(pc))
 110                return CAC_ADDR(pc);
 111
 112        return pc;
 113}
 114#define profile_pc profile_pc
 115
 116#include <asm-generic/ptrace.h>
 117#endif /* __ASM_SH_PTRACE_H */
 118