Josh Poimboeuf | 7c7900f | 2016-09-16 14:18:12 -0500 | [diff] [blame] | 1 | #include <linux/sched.h> |
| 2 | #include <linux/ftrace.h> |
| 3 | #include <asm/ptrace.h> |
| 4 | #include <asm/bitops.h> |
| 5 | #include <asm/stacktrace.h> |
| 6 | #include <asm/unwind.h> |
| 7 | |
| 8 | bool unwind_next_frame(struct unwind_state *state) |
| 9 | { |
| 10 | struct stack_info *info = &state->stack_info; |
| 11 | |
| 12 | if (unwind_done(state)) |
| 13 | return false; |
| 14 | |
| 15 | do { |
| 16 | for (state->sp++; state->sp < info->end; state->sp++) |
| 17 | if (__kernel_text_address(*state->sp)) |
| 18 | return true; |
| 19 | |
| 20 | state->sp = info->next_sp; |
| 21 | |
| 22 | } while (!get_stack_info(state->sp, state->task, info, |
| 23 | &state->stack_mask)); |
| 24 | |
| 25 | return false; |
| 26 | } |
| 27 | EXPORT_SYMBOL_GPL(unwind_next_frame); |
| 28 | |
| 29 | void __unwind_start(struct unwind_state *state, struct task_struct *task, |
| 30 | struct pt_regs *regs, unsigned long *first_frame) |
| 31 | { |
| 32 | memset(state, 0, sizeof(*state)); |
| 33 | |
| 34 | state->task = task; |
| 35 | state->sp = first_frame; |
| 36 | |
| 37 | get_stack_info(first_frame, state->task, &state->stack_info, |
| 38 | &state->stack_mask); |
| 39 | |
| 40 | if (!__kernel_text_address(*first_frame)) |
| 41 | unwind_next_frame(state); |
| 42 | } |
| 43 | EXPORT_SYMBOL_GPL(__unwind_start); |