1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Stack trace management functions 4 * 5 * Copyright (C) 2009-2021 Helge Deller <deller@gmx.de> 6 * based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com> 7 * and parisc unwind functions by Randolph Chung <tausq@debian.org> 8 * 9 * TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT) 10 */ 11 #include <linux/kernel.h> 12 #include <linux/stacktrace.h> 13 14 #include <asm/unwind.h> 15 16 static void notrace walk_stackframe(struct task_struct *task, 17 struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie) 18 { 19 struct unwind_frame_info info; 20 21 unwind_frame_init_task(&info, task, NULL); 22 while (1) { 23 if (unwind_once(&info) < 0 || info.ip == 0) 24 break; 25 26 if (__kernel_text_address(info.ip)) 27 if (!fn(cookie, info.ip)) 28 break; 29 } 30 } 31 32 void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, 33 struct task_struct *task, struct pt_regs *regs) 34 { 35 walk_stackframe(task, regs, consume_entry, cookie); 36 } 37 38 int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie, 39 struct task_struct *task) 40 { 41 walk_stackframe(task, NULL, consume_entry, cookie); 42 return 1; 43 } 44