| 1 | |
| 2 | |
| 3 | * arch/sh/kernel/stacktrace.c
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| 4 | *
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| 5 | * Stack trace management functions
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| 6 | *
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| 7 | * Copyright (C) 2006 - 2008 Paul Mundt
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| 8 |
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| 9 | #include <linux/sched.h>
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| 10 | #include <linux/sched/debug.h>
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| 11 | #include <linux/stacktrace.h>
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| 12 | #include <linux/thread_info.h>
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| 13 | #include <linux/module.h>
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| 14 | #include <asm/unwinder.h>
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| 15 | #include <asm/ptrace.h>
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| 16 | #include <asm/stacktrace.h>
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| 17 |
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| 18 | |
| 19 | * Save stack-backtrace addresses into a stack_trace buffer.
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| 20 |
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| 21 | static void save_stack_address(void *data, unsigned long addr, int reliable)
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| 22 | {
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| 23 | struct stack_trace *trace = data;
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| 24 |
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| 25 | if (!reliable)
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| 26 | return;
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| 27 |
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| 28 | if (trace->skip > 0) {
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| 29 | trace->skip--;
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| 30 | return;
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| 31 | }
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| 32 |
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| 33 | if (trace->nr_entries < trace->max_entries)
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| 34 | trace->entries[trace->nr_entries++] = addr;
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| 35 | }
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| 36 |
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| 37 | static const struct stacktrace_ops save_stack_ops = {
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| 38 | .address = save_stack_address,
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| 39 | };
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| 40 |
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| 41 | void save_stack_trace(struct stack_trace *trace)
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| 42 | {
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| 43 | unsigned long *sp = (unsigned long *)current_stack_pointer;
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| 44 |
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| 45 | unwind_stack(current, NULL, sp, &save_stack_ops, trace);
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| 46 | }
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| 47 | EXPORT_SYMBOL_GPL(save_stack_trace);
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| 48 |
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| 49 | static void
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| 50 | save_stack_address_nosched(void *data, unsigned long addr, int reliable)
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| 51 | {
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| 52 | struct stack_trace *trace = (struct stack_trace *)data;
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| 53 |
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| 54 | if (!reliable)
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| 55 | return;
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| 56 |
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| 57 | if (in_sched_functions(addr))
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| 58 | return;
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| 59 |
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| 60 | if (trace->skip > 0) {
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| 61 | trace->skip--;
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| 62 | return;
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| 63 | }
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| 64 |
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| 65 | if (trace->nr_entries < trace->max_entries)
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| 66 | trace->entries[trace->nr_entries++] = addr;
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| 67 | }
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| 68 |
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| 69 | static const struct stacktrace_ops save_stack_ops_nosched = {
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| 70 | .address = save_stack_address_nosched,
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| 71 | };
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| 72 |
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| 73 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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| 74 | {
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| 75 | unsigned long *sp = (unsigned long *)tsk->thread.sp;
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| 76 |
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| 77 | unwind_stack(current, NULL, sp, &save_stack_ops_nosched, trace);
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| 78 | }
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| 79 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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