Josh Poimboeuf | 7c7900f | 2016-09-16 14:18:12 -0500 | [diff] [blame] | 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 | |
Josh Poimboeuf | cfee9ed | 2016-10-06 00:28:40 -0500 | [diff] [blame] | 26 | unsigned long unwind_get_return_address(struct unwind_state *state); |
| 27 | |
Josh Poimboeuf | 7c7900f | 2016-09-16 14:18:12 -0500 | [diff] [blame] | 28 | static inline bool unwind_done(struct unwind_state *state) |
| 29 | { |
| 30 | return state->stack_info.type == STACK_TYPE_UNKNOWN; |
| 31 | } |
| 32 | |
| 33 | static inline |
| 34 | void unwind_start(struct unwind_state *state, struct task_struct *task, |
| 35 | struct pt_regs *regs, unsigned long *first_frame) |
| 36 | { |
| 37 | first_frame = first_frame ? : get_stack_pointer(task, regs); |
| 38 | |
| 39 | __unwind_start(state, task, regs, first_frame); |
| 40 | } |
| 41 | |
| 42 | #ifdef CONFIG_FRAME_POINTER |
| 43 | |
| 44 | static inline |
| 45 | unsigned long *unwind_get_return_address_ptr(struct unwind_state *state) |
| 46 | { |
| 47 | if (unwind_done(state)) |
| 48 | return NULL; |
| 49 | |
| 50 | return state->bp + 1; |
| 51 | } |
| 52 | |
Josh Poimboeuf | 7c7900f | 2016-09-16 14:18:12 -0500 | [diff] [blame] | 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 | |
Josh Poimboeuf | 7c7900f | 2016-09-16 14:18:12 -0500 | [diff] [blame] | 61 | #endif /* CONFIG_FRAME_POINTER */ |
| 62 | |
| 63 | #endif /* _ASM_X86_UNWIND_H */ |