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