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  */
  26 struct 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 */
  39 extern int regs_query_register_offset(const char *name);
  40 extern const char *regs_query_register_name(unsigned int offset);
  41
  42 extern 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  */
  53 static 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  */
  69 static 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  */
  85 static 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
  96 struct perf_event;
  97 struct perf_sample_data;
  98
  99 extern 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
 105 static 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 */