46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Stack trace management functions
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*
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* Copyright (C) 2018 snyh <xiabin@deepin.com>
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*/
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#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include <linux/sched/task_stack.h>
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#include <linux/sched/debug.h>
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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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save_stack_trace_tsk(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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unsigned long *sp = (unsigned long *)task_thread_info(tsk)->pcb.ksp;
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unsigned long addr;
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WARN_ON(trace->nr_entries || !trace->max_entries);
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while (!kstack_end(sp)) {
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addr = *sp++;
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if (__kernel_text_address(addr) &&
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!in_sched_functions(addr)) {
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if (trace->skip > 0)
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trace->skip--;
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else
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trace->entries[trace->nr_entries++] = addr;
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if (trace->nr_entries >= trace->max_entries)
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break;
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}
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}
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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