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         bool error;
  15 #ifdef CONFIG_FRAME_POINTER
  16         bool got_irq;
  17         unsigned long *bp, *orig_sp;
  18         struct pt_regs *regs;
  19         unsigned long ip;
  20 #else
  21         unsigned long *sp;
  22 #endif
  23 };
  24
  25 void __unwind_start(struct unwind_state *state, struct task_struct *task,
  26                     struct pt_regs *regs, unsigned long *first_frame);
  27
  28 bool unwind_next_frame(struct unwind_state *state);
  29
  30 unsigned long unwind_get_return_address(struct unwind_state *state);
  31
  32 static inline bool unwind_done(struct unwind_state *state)
  33 {
  34         return state->stack_info.type == STACK_TYPE_UNKNOWN;
  35 }
  36
  37 static inline
  38 void unwind_start(struct unwind_state *state, struct task_struct *task,
  39                   struct pt_regs *regs, unsigned long *first_frame)
  40 {
  41         first_frame = first_frame ? : get_stack_pointer(task, regs);
  42
  43         __unwind_start(state, task, regs, first_frame);
  44 }
  45
  46 static inline bool unwind_error(struct unwind_state *state)
  47 {
  48         return state->error;
  49 }
  50
  51 #ifdef CONFIG_FRAME_POINTER
  52
  53 static inline
  54 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
  55 {
  56         if (unwind_done(state))
  57                 return NULL;
  58
  59         return state->regs ? &state->regs->ip : state->bp + 1;
  60 }
  61
  62 static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
  63 {
  64         if (unwind_done(state))
  65                 return NULL;
  66
  67         return state->regs;
  68 }
  69
  70 #else /* !CONFIG_FRAME_POINTER */
  71
  72 static inline
  73 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
  74 {
  75         return NULL;
  76 }
  77
  78 static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
  79 {
  80         return NULL;
  81 }
  82
  83 #endif /* CONFIG_FRAME_POINTER */
  84
  85 #endif /* _ASM_X86_UNWIND_H */