1 // SPDX-License-Identifier: GPL-2.0-only 1
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>
10
11 #include "kstack.h"
12
13 static void __save_stack_trace(struct thread_i
14 struct stack_tr
15 bool skip_sched
16 {
17 unsigned long ksp, fp;
18 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
19 struct task_struct *t;
20 int graph = 0;
21 #endif
22
23 if (tp == current_thread_info()) {
24 stack_trace_flush();
25 __asm__ __volatile__("mov %%fp
26 } else {
27 ksp = tp->ksp;
28 }
29
30 fp = ksp + STACK_BIAS;
31 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
32 t = tp->task;
33 #endif
34 do {
35 struct sparc_stackf *sf;
36 struct pt_regs *regs;
37 unsigned long pc;
38
39 if (!kstack_valid(tp, fp))
40 break;
41
42 sf = (struct sparc_stackf *) f
43 regs = (struct pt_regs *) (sf
44
45 if (kstack_is_trap_frame(tp, r
46 if (!(regs->tstate & T
47 break;
48 pc = regs->tpc;
49 fp = regs->u_regs[UREG
50 } else {
51 pc = sf->callers_pc;
52 fp = (unsigned long)sf
53 }
54
55 if (trace->skip > 0)
56 trace->skip--;
57 else if (!skip_sched || !in_sc
58 trace->entries[trace->
59 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
60 if ((pc + 8UL) == (uns
61 struct ftrace_
62 ret_stack = ft
63
64 if (ret_stack)
65 pc = r
66 if (tr
67 tr
68
69 graph+
70 }
71 }
72 #endif
73 }
74 } while (trace->nr_entries < trace->ma
75 }
76
77 void save_stack_trace(struct stack_trace *trac
78 {
79 __save_stack_trace(current_thread_info
80 }
81 EXPORT_SYMBOL_GPL(save_stack_trace);
82
83 void save_stack_trace_tsk(struct task_struct *
84 {
85 struct thread_info *tp = task_thread_i
86
87 __save_stack_trace(tp, trace, true);
88 }
89 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
90
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