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;
  16 #else
  17         unsigned long *sp;
  18 #endif
  19 };
  20
  21 void __unwind_start(struct unwind_state *state, struct task_struct *task,
  22                     struct pt_regs *regs, unsigned long *first_frame);
  23
  24 bool unwind_next_frame(struct unwind_state *state);
  25
  26 static inline bool unwind_done(struct unwind_state *state)
  27 {
  28         return state->stack_info.type == STACK_TYPE_UNKNOWN;
  29 }
  30
  31 static inline
  32 void unwind_start(struct unwind_state *state, struct task_struct *task,
  33                   struct pt_regs *regs, unsigned long *first_frame)
  34 {
  35         first_frame = first_frame ? : get_stack_pointer(task, regs);
  36
  37         __unwind_start(state, task, regs, first_frame);
  38 }
  39
  40 #ifdef CONFIG_FRAME_POINTER
  41
  42 static inline
  43 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
  44 {
  45         if (unwind_done(state))
  46                 return NULL;
  47
  48         return state->bp + 1;
  49 }
  50
  51 unsigned long unwind_get_return_address(struct unwind_state *state);
  52
  53 #else /* !CONFIG_FRAME_POINTER */
  54
  55 static inline
  56 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
  57 {
  58         return NULL;
  59 }
  60
  61 static inline
  62 unsigned long unwind_get_return_address(struct unwind_state *state)
  63 {
  64         if (unwind_done(state))
  65                 return 0;
  66
  67         return ftrace_graph_ret_addr(state->task, &state->graph_idx,
  68                                      *state->sp, state->sp);
  69 }
  70
  71 #endif /* CONFIG_FRAME_POINTER */
  72
  73 #endif /* _ASM_X86_UNWIND_H */