1 // SPDX-License-Identifier: GPL-2.0 !! 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* <<
3 * arch/sh/kernel/stacktrace.c <<
4 * <<
5 * Stack trace management functions <<
6 * <<
7 * Copyright (C) 2006 - 2008 Paul Mundt <<
8 */ <<
9 #include <linux/sched.h> 2 #include <linux/sched.h>
10 #include <linux/sched/debug.h> 3 #include <linux/sched/debug.h>
11 #include <linux/stacktrace.h> 4 #include <linux/stacktrace.h>
12 #include <linux/thread_info.h> 5 #include <linux/thread_info.h>
13 #include <linux/module.h> !! 6 #include <linux/ftrace.h>
14 #include <asm/unwinder.h> !! 7 #include <linux/export.h>
15 #include <asm/ptrace.h> 8 #include <asm/ptrace.h>
16 #include <asm/stacktrace.h> 9 #include <asm/stacktrace.h>
17 10
18 /* !! 11 #include "kstack.h"
19 * Save stack-backtrace addresses into a stack <<
20 */ <<
21 static void save_stack_address(void *data, uns <<
22 { <<
23 struct stack_trace *trace = data; <<
24 <<
25 if (!reliable) <<
26 return; <<
27 12
28 if (trace->skip > 0) { !! 13 static void __save_stack_trace(struct thread_info *tp,
29 trace->skip--; !! 14 struct stack_trace *trace,
30 return; !! 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, %0" : "=r" (ksp));
>> 26 } else {
>> 27 ksp = tp->ksp;
31 } 28 }
32 29
33 if (trace->nr_entries < trace->max_ent !! 30 fp = ksp + STACK_BIAS;
34 trace->entries[trace->nr_entri !! 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 *) fp;
>> 43 regs = (struct pt_regs *) (sf + 1);
>> 44
>> 45 if (kstack_is_trap_frame(tp, regs)) {
>> 46 if (!(regs->tstate & TSTATE_PRIV))
>> 47 break;
>> 48 pc = regs->tpc;
>> 49 fp = regs->u_regs[UREG_I6] + STACK_BIAS;
>> 50 } else {
>> 51 pc = sf->callers_pc;
>> 52 fp = (unsigned long)sf->fp + STACK_BIAS;
>> 53 }
>> 54
>> 55 if (trace->skip > 0)
>> 56 trace->skip--;
>> 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,
>> 63 graph);
>> 64 if (ret_stack) {
>> 65 pc = ret_stack->ret;
>> 66 if (trace->nr_entries <
>> 67 trace->max_entries)
>> 68 trace->entries[trace->nr_entries++] = pc;
>> 69 graph++;
>> 70 }
>> 71 }
>> 72 #endif
>> 73 }
>> 74 } while (trace->nr_entries < trace->max_entries);
35 } 75 }
36 76
37 static const struct stacktrace_ops save_stack_ <<
38 .address = save_stack_address, <<
39 }; <<
40 <<
41 void save_stack_trace(struct stack_trace *trac 77 void save_stack_trace(struct stack_trace *trace)
42 { 78 {
43 unsigned long *sp = (unsigned long *)c !! 79 __save_stack_trace(current_thread_info(), trace, false);
44 <<
45 unwind_stack(current, NULL, sp, &save <<
46 } 80 }
47 EXPORT_SYMBOL_GPL(save_stack_trace); 81 EXPORT_SYMBOL_GPL(save_stack_trace);
48 82
49 static void <<
50 save_stack_address_nosched(void *data, unsigne <<
51 { <<
52 struct stack_trace *trace = (struct st <<
53 <<
54 if (!reliable) <<
55 return; <<
56 <<
57 if (in_sched_functions(addr)) <<
58 return; <<
59 <<
60 if (trace->skip > 0) { <<
61 trace->skip--; <<
62 return; <<
63 } <<
64 <<
65 if (trace->nr_entries < trace->max_ent <<
66 trace->entries[trace->nr_entri <<
67 } <<
68 <<
69 static const struct stacktrace_ops save_stack_ <<
70 .address = save_stack_address_nosched, <<
71 }; <<
72 <<
73 void save_stack_trace_tsk(struct task_struct * 83 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
74 { 84 {
75 unsigned long *sp = (unsigned long *)t !! 85 struct thread_info *tp = task_thread_info(tsk);
76 86
77 unwind_stack(current, NULL, sp, &save !! 87 __save_stack_trace(tp, trace, true);
78 } 88 }
79 EXPORT_SYMBOL_GPL(save_stack_trace_tsk); 89 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
80 90
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