| 1 | |
| 2 | * kernel/stacktrace.c
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| 3 | *
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| 4 | * Stack trace management functions
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| 5 | *
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| 6 | * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <[email protected]>
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| 7 |
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| 8 | #include <linux/sched.h>
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| 9 | #include <linux/kernel.h>
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| 10 | #include <linux/export.h>
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| 11 | #include <linux/kallsyms.h>
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| 12 | #include <linux/stacktrace.h>
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| 13 |
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| 14 | void print_stack_trace(struct stack_trace *trace, int spaces)
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| 15 | {
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| 16 | int i;
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| 17 |
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| 18 | if (WARN_ON(!trace->entries))
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| 19 | return;
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| 20 |
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| 21 | for (i = 0; i < trace->nr_entries; i++) {
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| 22 | printk("%*c", 1 + spaces, ' ');
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| 23 | print_ip_sym(trace->entries[i]);
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| 24 | }
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| 25 | }
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| 26 | EXPORT_SYMBOL_GPL(print_stack_trace);
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| 27 |
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| 28 | int snprint_stack_trace(char *buf, size_t size,
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| 29 | struct stack_trace *trace, int spaces)
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| 30 | {
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| 31 | int i;
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| 32 | unsigned long ip;
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| 33 | int generated;
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| 34 | int total = 0;
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| 35 |
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| 36 | if (WARN_ON(!trace->entries))
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| 37 | return 0;
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| 38 |
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| 39 | for (i = 0; i < trace->nr_entries; i++) {
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| 40 | ip = trace->entries[i];
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| 41 | generated = snprintf(buf, size, "%*c[<%p>] %pS\n",
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| 42 | 1 + spaces, ' ', (void *) ip, (void *) ip);
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| 43 |
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| 44 | total += generated;
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| 45 |
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| 46 |
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| 47 | if (generated >= size) {
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| 48 | buf += size;
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| 49 | size = 0;
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| 50 | } else {
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| 51 | buf += generated;
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| 52 | size -= generated;
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| 53 | }
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| 54 | }
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| 55 |
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| 56 | return total;
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| 57 | }
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| 58 | EXPORT_SYMBOL_GPL(snprint_stack_trace);
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| 59 |
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| 60 | |
| 61 | * Architectures that do not implement save_stack_trace_tsk or
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| 62 | * save_stack_trace_regs get this weak alias and a once-per-bootup warning
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| 63 | * (whenever this facility is utilized - for example by procfs):
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| 64 |
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| 65 | __weak void
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| 66 | save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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| 67 | {
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| 68 | WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
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| 69 | }
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| 70 |
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| 71 | __weak void
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| 72 | save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
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| 73 | {
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| 74 | WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.\n");
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| 75 | }
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