blob: 884d68a6e714e16b2a4dc2a8cb12301de6d8402a [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
#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)
unsigned long addr;
if (unwind_done(state))
return 0;
addr = READ_ONCE_NOCHECK(*state->sp);
return unwind_recover_ret_addr(state, addr, state->sp);
unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
return NULL;
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++) {
unsigned long addr = READ_ONCE_NOCHECK(*state->sp);
if (__kernel_text_address(addr))
return true;
state->sp = PTR_ALIGN(info->next_sp, sizeof(long));
} while (!get_stack_info(state->sp, state->task, info,
return false;
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 = PTR_ALIGN(first_frame, sizeof(long));
get_stack_info(first_frame, state->task, &state->stack_info,
* The caller can provide the address of the first frame directly
* (first_frame) or indirectly (regs->sp) to indicate which stack frame
* to start unwinding at. Skip ahead until we reach it.
if (!unwind_done(state) &&
(!on_stack(&state->stack_info, first_frame, sizeof(long)) ||