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