1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/sched.h>
3 #include <linux/sched/debug.h>
4 #include <linux/stacktrace.h>
5 #include <linux/thread_info.h>
6 #include <linux/ftrace.h>
7 #include <linux/export.h>
8 #include <asm/ptrace.h>
9 #include <asm/stacktrace.h>
13 static void __save_stack_trace(struct thread_info *tp,
14 struct stack_trace *trace,
17 unsigned long ksp, fp;
18 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
19 struct task_struct *t;
23 if (tp == current_thread_info()) {
25 __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
30 fp = ksp + STACK_BIAS;
31 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
35 struct sparc_stackf *sf;
39 if (!kstack_valid(tp, fp))
42 sf = (struct sparc_stackf *) fp;
43 regs = (struct pt_regs *) (sf + 1);
45 if (kstack_is_trap_frame(tp, regs)) {
46 if (!(regs->tstate & TSTATE_PRIV))
49 fp = regs->u_regs[UREG_I6] + STACK_BIAS;
52 fp = (unsigned long)sf->fp + STACK_BIAS;
57 else if (!skip_sched || !in_sched_functions(pc)) {
58 trace->entries[trace->nr_entries++] = pc;
59 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
60 if ((pc + 8UL) == (unsigned long) &return_to_handler) {
61 struct ftrace_ret_stack *ret_stack;
62 ret_stack = ftrace_graph_get_ret_stack(t,
66 if (trace->nr_entries <
68 trace->entries[trace->nr_entries++] = pc;
74 } while (trace->nr_entries < trace->max_entries);
77 void save_stack_trace(struct stack_trace *trace)
79 __save_stack_trace(current_thread_info(), trace, false);
81 EXPORT_SYMBOL_GPL(save_stack_trace);
83 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
85 struct thread_info *tp = task_thread_info(tsk);
87 __save_stack_trace(tp, trace, true);
89 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);