1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2005-2017 Andes Technology Corporation
4 #include <linux/sched/debug.h>
5 #include <linux/sched/task_stack.h>
6 #include <linux/stacktrace.h>
7 #include <linux/ftrace.h>
9 void save_stack_trace(struct stack_trace *trace)
11 save_stack_trace_tsk(current, trace);
13 EXPORT_SYMBOL_GPL(save_stack_trace);
15 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
18 int skip = trace->skip;
23 __asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(fpn));
26 fpn = (unsigned long *)thread_saved_fp(tsk);
30 while (!kstack_end(fpn) && !((unsigned long)fpn & 0x3)
31 && (fpn >= (unsigned long *)TASK_SIZE)) {
32 unsigned long lpp, fpp;
36 if (!__kernel_text_address(lpp))
39 lpp = ftrace_graph_ret_addr(tsk, &graph_idx, lpp, NULL);
41 if (savesched || !in_sched_functions(lpp)) {
45 trace->entries[trace->nr_entries++] = lpp;
46 if (trace->nr_entries >= trace->max_entries)
50 fpn = (unsigned long *)fpp;
53 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);