1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. */
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)
17 unsigned long *fp, *stack_start, *stack_end;
19 int skip = trace->skip;
24 asm volatile("mov %0, r8\n":"=r"(fp));
27 fp = (unsigned long *)thread_saved_fp(tsk);
31 addr = (unsigned long) fp & THREAD_MASK;
32 stack_start = (unsigned long *) addr;
33 stack_end = (unsigned long *) (addr + THREAD_SIZE);
35 while (fp > stack_start && fp < stack_end) {
36 unsigned long lpp, fpp;
40 if (!__kernel_text_address(lpp))
43 lpp = ftrace_graph_ret_addr(tsk, &graph_idx, lpp, NULL);
45 if (savesched || !in_sched_functions(lpp)) {
49 trace->entries[trace->nr_entries++] = lpp;
50 if (trace->nr_entries >= trace->max_entries)
54 fp = (unsigned long *)fpp;
57 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);