arch/x86/include/asm/unwind.h

   1 #ifndef _ASM_X86_UNWIND_H
   2 #define _ASM_X86_UNWIND_H
   3
   4 #include <linux/sched.h>
   5 #include <linux/ftrace.h>
   6 #include <asm/ptrace.h>
   7 #include <asm/stacktrace.h>
   8
   9 struct unwind_state {
  10         struct stack_info stack_info;
  11         unsigned long stack_mask;
  12         struct task_struct *task;
  13         int graph_idx;
  14 #ifdef CONFIG_FRAME_POINTER
  15         unsigned long *bp, *orig_sp;
  16         struct pt_regs *regs;
  17 #else
  18         unsigned long *sp;
  19 #endif
  20 };
  21
  22 void __unwind_start(struct unwind_state *state, struct task_struct *task,
  23                     struct pt_regs *regs, unsigned long *first_frame);
  24
  25 bool unwind_next_frame(struct unwind_state *state);
  26
  27 unsigned long unwind_get_return_address(struct unwind_state *state);
  28
  29 static inline bool unwind_done(struct unwind_state *state)
  30 {
  31         return state->stack_info.type == STACK_TYPE_UNKNOWN;
  32 }
  33
  34 static inline
  35 void unwind_start(struct unwind_state *state, struct task_struct *task,
  36                   struct pt_regs *regs, unsigned long *first_frame)
  37 {
  38         first_frame = first_frame ? : get_stack_pointer(task, regs);
  39
  40         __unwind_start(state, task, regs, first_frame);
  41 }
  42
  43 #ifdef CONFIG_FRAME_POINTER
  44
  45 static inline
  46 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
  47 {
  48         if (unwind_done(state))
  49                 return NULL;
  50
  51         return state->regs ? &state->regs->ip : state->bp + 1;
  52 }
  53
  54 static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
  55 {
  56         if (unwind_done(state))
  57                 return NULL;
  58
  59         return state->regs;
  60 }
  61
  62 #else /* !CONFIG_FRAME_POINTER */
  63
  64 static inline
  65 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
  66 {
  67         return NULL;
  68 }
  69
  70 static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
  71 {
  72         return NULL;
  73 }
  74
  75 #endif /* CONFIG_FRAME_POINTER */
  76
  77 #endif /* _ASM_X86_UNWIND_H */