54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/sched/debug.h>
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#include <linux/sched/task_stack.h>
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#include <linux/stacktrace.h>
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#include <linux/ftrace.h>
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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 *fpn;
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int skip = trace->skip;
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int savesched;
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int graph_idx = 0;
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if (tsk == current) {
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__asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(fpn));
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savesched = 1;
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} else {
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fpn = (unsigned long *)thread_saved_fp(tsk);
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savesched = 0;
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}
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while (!kstack_end(fpn) && !((unsigned long)fpn & 0x3)
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&& (fpn >= (unsigned long *)TASK_SIZE)) {
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unsigned long lpp, fpp;
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lpp = fpn[LP_OFFSET];
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fpp = fpn[FP_OFFSET];
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if (!__kernel_text_address(lpp))
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break;
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else
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lpp = ftrace_graph_ret_addr(tsk, &graph_idx, lpp, NULL);
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if (savesched || !in_sched_functions(lpp)) {
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if (skip) {
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skip--;
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} else {
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trace->entries[trace->nr_entries++] = lpp;
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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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fpn = (unsigned long *)fpp;
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}
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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