mirror of https://gitee.com/openkylin/linux.git
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
#include <linux/sched.h>
|
|
#include <linux/ftrace.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/bitops.h>
|
|
#include <asm/stacktrace.h>
|
|
#include <asm/unwind.h>
|
|
|
|
unsigned long unwind_get_return_address(struct unwind_state *state)
|
|
{
|
|
if (unwind_done(state))
|
|
return 0;
|
|
|
|
return ftrace_graph_ret_addr(state->task, &state->graph_idx,
|
|
*state->sp, state->sp);
|
|
}
|
|
EXPORT_SYMBOL_GPL(unwind_get_return_address);
|
|
|
|
bool unwind_next_frame(struct unwind_state *state)
|
|
{
|
|
struct stack_info *info = &state->stack_info;
|
|
|
|
if (unwind_done(state))
|
|
return false;
|
|
|
|
do {
|
|
for (state->sp++; state->sp < info->end; state->sp++)
|
|
if (__kernel_text_address(*state->sp))
|
|
return true;
|
|
|
|
state->sp = info->next_sp;
|
|
|
|
} while (!get_stack_info(state->sp, state->task, info,
|
|
&state->stack_mask));
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(unwind_next_frame);
|
|
|
|
void __unwind_start(struct unwind_state *state, struct task_struct *task,
|
|
struct pt_regs *regs, unsigned long *first_frame)
|
|
{
|
|
memset(state, 0, sizeof(*state));
|
|
|
|
state->task = task;
|
|
state->sp = first_frame;
|
|
|
|
get_stack_info(first_frame, state->task, &state->stack_info,
|
|
&state->stack_mask);
|
|
|
|
if (!__kernel_text_address(*first_frame))
|
|
unwind_next_frame(state);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__unwind_start);
|