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>
8 unsigned long unwind_get_return_address(struct unwind_state *state)
10 if (unwind_done(state))
13 return ftrace_graph_ret_addr(state->task, &state->graph_idx,
14 *state->sp, state->sp);
16 EXPORT_SYMBOL_GPL(unwind_get_return_address);
18 bool unwind_next_frame(struct unwind_state *state)
20 struct stack_info *info = &state->stack_info;
22 if (unwind_done(state))
26 for (state->sp++; state->sp < info->end; state->sp++)
27 if (__kernel_text_address(*state->sp))
30 state->sp = info->next_sp;
32 } while (!get_stack_info(state->sp, state->task, info,
37 EXPORT_SYMBOL_GPL(unwind_next_frame);
39 void __unwind_start(struct unwind_state *state, struct task_struct *task,
40 struct pt_regs *regs, unsigned long *first_frame)
42 memset(state, 0, sizeof(*state));
45 state->sp = first_frame;
47 get_stack_info(first_frame, state->task, &state->stack_info,
51 * The caller can provide the address of the first frame directly
52 * (first_frame) or indirectly (regs->sp) to indicate which stack frame
53 * to start unwinding at. Skip ahead until we reach it.
55 if (!unwind_done(state) &&
56 (!on_stack(&state->stack_info, first_frame, sizeof(long)) ||
57 !__kernel_text_address(*first_frame)))
58 unwind_next_frame(state);
60 EXPORT_SYMBOL_GPL(__unwind_start);