1 // SPDX-License-Identifier: GPL-2.0
3 * Stack trace management functions
5 * Copyright IBM Corp. 2006
6 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
9 #include <linux/stacktrace.h>
10 #include <asm/stacktrace.h>
11 #include <asm/unwind.h>
12 #include <asm/kprobes.h>
14 void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
15 struct task_struct *task, struct pt_regs *regs)
17 struct unwind_state state;
20 unwind_for_each_frame(&state, task, regs, 0) {
21 addr = unwind_get_return_address(&state);
22 if (!addr || !consume_entry(cookie, addr, false))
28 * This function returns an error if it detects any unreliable features of the
29 * stack. Otherwise it guarantees that the stack trace is reliable.
31 * If the task is not 'current', the caller *must* ensure the task is inactive.
33 int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
34 void *cookie, struct task_struct *task)
36 struct unwind_state state;
39 unwind_for_each_frame(&state, task, NULL, 0) {
40 if (state.stack_info.type != STACK_TYPE_TASK)
46 addr = unwind_get_return_address(&state);
52 * Mark stacktraces with kretprobed functions on them
55 if (state.ip == (unsigned long)kretprobe_trampoline)
59 if (!consume_entry(cookie, addr, false))
63 /* Check for stack corruption */
64 if (unwind_error(&state))