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 */ 74