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46 lines
1.2 KiB
46 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Stack trace management functions |
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* |
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* Copyright (C) 2009 Helge Deller <[email protected]> |
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* based on arch/x86/kernel/stacktrace.c by Ingo Molnar <[email protected]> |
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* and parisc unwind functions by Randolph Chung <[email protected]> |
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* |
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* TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT) |
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*/ |
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#include <linux/module.h> |
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#include <linux/stacktrace.h> |
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#include <asm/unwind.h> |
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static void dump_trace(struct task_struct *task, struct stack_trace *trace) |
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{ |
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struct unwind_frame_info info; |
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unwind_frame_init_task(&info, task, NULL); |
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/* unwind stack and save entries in stack_trace struct */ |
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trace->nr_entries = 0; |
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while (trace->nr_entries < trace->max_entries) { |
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if (unwind_once(&info) < 0 || info.ip == 0) |
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break; |
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if (__kernel_text_address(info.ip)) |
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trace->entries[trace->nr_entries++] = info.ip; |
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} |
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} |
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/* |
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* Save stack-backtrace addresses into a stack_trace buffer. |
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*/ |
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void save_stack_trace(struct stack_trace *trace) |
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{ |
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dump_trace(current, trace); |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace); |
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
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{ |
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dump_trace(tsk, trace); |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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