1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* <<
3 * Stacktrace support for Hexagon <<
4 * <<
5 * Copyright (c) 2010-2011, The Linux Foundati <<
6 */ <<
7 <<
8 #include <linux/sched.h> 2 #include <linux/sched.h>
9 #include <linux/sched/task_stack.h> !! 3 #include <linux/sched/debug.h>
10 #include <linux/stacktrace.h> 4 #include <linux/stacktrace.h>
11 #include <linux/thread_info.h> 5 #include <linux/thread_info.h>
12 #include <linux/module.h> !! 6 #include <linux/ftrace.h>
13 !! 7 #include <linux/export.h>
14 struct stackframe { !! 8 #include <asm/ptrace.h>
15 unsigned long fp; !! 9 #include <asm/stacktrace.h>
16 unsigned long rets; !! 10
17 }; !! 11 #include "kstack.h"
18 !! 12
19 /* !! 13 static void __save_stack_trace(struct thread_info *tp,
20 * Save stack-backtrace addresses into a stack !! 14 struct stack_trace *trace,
21 */ !! 15 bool skip_sched)
22 void save_stack_trace(struct stack_trace *trac <<
23 { 16 {
24 unsigned long low, high; !! 17 unsigned long ksp, fp;
25 unsigned long fp; !! 18 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
26 struct stackframe *frame; !! 19 struct task_struct *t;
27 int skip = trace->skip; !! 20 int graph = 0;
28 !! 21 #endif
29 low = (unsigned long)task_stack_page(c !! 22
30 high = low + THREAD_SIZE; !! 23 if (tp == current_thread_info()) {
31 fp = (unsigned long)__builtin_frame_ad !! 24 stack_trace_flush();
>> 25 __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
>> 26 } else {
>> 27 ksp = tp->ksp;
>> 28 }
32 29
33 while (fp >= low && fp <= (high - size !! 30 fp = ksp + STACK_BIAS;
34 frame = (struct stackframe *)f !! 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;
35 38
36 if (skip) { !! 39 if (!kstack_valid(tp, fp))
37 skip--; !! 40 break;
38 } else { !! 41
39 trace->entries[trace-> !! 42 sf = (struct sparc_stackf *) fp;
40 if (trace->nr_entries !! 43 regs = (struct pt_regs *) (sf + 1);
>> 44
>> 45 if (kstack_is_trap_frame(tp, regs)) {
>> 46 if (!(regs->tstate & TSTATE_PRIV))
41 break; 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;
42 } 53 }
43 54
44 /* !! 55 if (trace->skip > 0)
45 * The next frame must be at a !! 56 trace->skip--;
46 * current frame. !! 57 else if (!skip_sched || !in_sched_functions(pc)) {
47 */ !! 58 trace->entries[trace->nr_entries++] = pc;
48 low = fp + sizeof(*frame); !! 59 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
49 fp = frame->fp; !! 60 if ((pc + 8UL) == (unsigned long) &return_to_handler) {
50 } !! 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);
>> 75 }
>> 76
>> 77 void save_stack_trace(struct stack_trace *trace)
>> 78 {
>> 79 __save_stack_trace(current_thread_info(), trace, false);
51 } 80 }
52 EXPORT_SYMBOL_GPL(save_stack_trace); 81 EXPORT_SYMBOL_GPL(save_stack_trace);
>> 82
>> 83 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
>> 84 {
>> 85 struct thread_info *tp = task_thread_info(tsk);
>> 86
>> 87 __save_stack_trace(tp, trace, true);
>> 88 }
>> 89 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
53 90
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