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

   1#ifndef __ASM_SH_PTRACE_H
   2#define __ASM_SH_PTRACE_H
   3
   4/*
   5 * Copyright (C) 1999, 2000  Niibe Yutaka
   6 */
   7
   8#define PTRACE_GETREGS          12      /* General registers */
   9#define PTRACE_SETREGS          13
  10
  11#define PTRACE_GETFPREGS        14      /* FPU registers */
  12#define PTRACE_SETFPREGS        15
  13
  14#define PTRACE_GETFDPIC         31      /* get the ELF fdpic loadmap address */
  15
  16#define PTRACE_GETFDPIC_EXEC    0       /* [addr] request the executable loadmap */
  17#define PTRACE_GETFDPIC_INTERP  1       /* [addr] request the interpreter loadmap */
  18
  19#define PTRACE_GETDSPREGS       55      /* DSP registers */
  20#define PTRACE_SETDSPREGS       56
  21
  22#define PT_TEXT_END_ADDR        240
  23#define PT_TEXT_ADDR            244     /* &(struct user)->start_code */
  24#define PT_DATA_ADDR            248     /* &(struct user)->start_data */
  25#define PT_TEXT_LEN             252
  26
  27#if defined(__SH5__) || defined(CONFIG_CPU_SH5)
  28#include "ptrace_64.h"
  29#else
  30#include "ptrace_32.h"
  31#endif
  32
  33#ifdef __KERNEL__
  34
  35#include <linux/stringify.h>
  36#include <linux/stddef.h>
  37#include <linux/thread_info.h>
  38#include <asm/addrspace.h>
  39#include <asm/page.h>
  40
  41#define user_mode(regs)                 (((regs)->sr & 0x40000000)==0)
  42#define kernel_stack_pointer(_regs)     ((unsigned long)(_regs)->regs[15])
  43
  44#define GET_FP(regs)    ((regs)->regs[14])
  45#define GET_USP(regs)   ((regs)->regs[15])
  46
  47#define arch_has_single_step()  (1)
  48
  49/*
  50 * kprobe-based event tracer support
  51 */
  52struct pt_regs_offset {
  53        const char *name;
  54        int offset;
  55};
  56
  57#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
  58#define REGS_OFFSET_NAME(num)   \
  59        {.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])}
  60#define TREGS_OFFSET_NAME(num)  \
  61        {.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])}
  62#define REG_OFFSET_END {.name = NULL, .offset = 0}
  63
  64/* Query offset/name of register from its name/offset */
  65extern int regs_query_register_offset(const char *name);
  66extern const char *regs_query_register_name(unsigned int offset);
  67
  68extern const struct pt_regs_offset regoffset_table[];
  69
  70/**
  71 * regs_get_register() - get register value from its offset
  72 * @regs:       pt_regs from which register value is gotten.
  73 * @offset:     offset number of the register.
  74 *
  75 * regs_get_register returns the value of a register. The @offset is the
  76 * offset of the register in struct pt_regs address which specified by @regs.
  77 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
  78 */
  79static inline unsigned long regs_get_register(struct pt_regs *regs,
  80                                              unsigned int offset)
  81{
  82        if (unlikely(offset > MAX_REG_OFFSET))
  83                return 0;
  84        return *(unsigned long *)((unsigned long)regs + offset);
  85}
  86
  87/**
  88 * regs_within_kernel_stack() - check the address in the stack
  89 * @regs:       pt_regs which contains kernel stack pointer.
  90 * @addr:       address which is checked.
  91 *
  92 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
  93 * If @addr is within the kernel stack, it returns true. If not, returns false.
  94 */
  95static inline int regs_within_kernel_stack(struct pt_regs *regs,
  96                                           unsigned long addr)
  97{
  98        return ((addr & ~(THREAD_SIZE - 1))  ==
  99                (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
 100}
 101
 102/**
 103 * regs_get_kernel_stack_nth() - get Nth entry of the stack
 104 * @regs:       pt_regs which contains kernel stack pointer.
 105 * @n:          stack entry number.
 106 *
 107 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
 108 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
 109 * this returns 0.
 110 */
 111static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
 112                                                      unsigned int n)
 113{
 114        unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
 115        addr += n;
 116        if (regs_within_kernel_stack(regs, (unsigned long)addr))
 117                return *addr;
 118        else
 119                return 0;
 120}
 121
 122struct perf_event;
 123struct perf_sample_data;
 124
 125extern void ptrace_triggered(struct perf_event *bp,
 126                      struct perf_sample_data *data, struct pt_regs *regs);
 127
 128#define task_pt_regs(task) \
 129        ((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE) - 1)
 130
 131static inline unsigned long profile_pc(struct pt_regs *regs)
 132{
 133        unsigned long pc = regs->pc;
 134
 135        if (virt_addr_uncached(pc))
 136                return CAC_ADDR(pc);
 137
 138        return pc;
 139}
 140#define profile_pc profile_pc
 141
 142#include <asm-generic/ptrace.h>
 143#endif /* __KERNEL__ */
 144
 145#endif /* __ASM_SH_PTRACE_H */
 146