/*
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* kernel/stacktrace.c
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*
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* Stack trace management functions
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*
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* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/kallsyms.h>
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#include <linux/stacktrace.h>
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void print_stack_trace(struct stack_trace *trace, int spaces)
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{
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int i;
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if (WARN_ON(!trace->entries))
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return;
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for (i = 0; i < trace->nr_entries; i++)
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printk("%*c%pS\n", 1 + spaces, ' ', (void *)trace->entries[i]);
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}
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EXPORT_SYMBOL_GPL(print_stack_trace);
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int snprint_stack_trace(char *buf, size_t size,
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struct stack_trace *trace, int spaces)
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{
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int i;
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int generated;
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int total = 0;
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if (WARN_ON(!trace->entries))
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return 0;
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for (i = 0; i < trace->nr_entries; i++) {
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generated = snprintf(buf, size, "%*c%pS\n", 1 + spaces, ' ',
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(void *)trace->entries[i]);
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total += generated;
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/* Assume that generated isn't a negative number */
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if (generated >= size) {
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buf += size;
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size = 0;
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} else {
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buf += generated;
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size -= generated;
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}
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}
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return total;
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}
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EXPORT_SYMBOL_GPL(snprint_stack_trace);
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/*
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* Architectures that do not implement save_stack_trace_*()
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* get these weak aliases and once-per-bootup warnings
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* (whenever this facility is utilized - for example by procfs):
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*/
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__weak void
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save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
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}
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__weak void
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save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
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{
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WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.\n");
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}
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__weak int
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save_stack_trace_tsk_reliable(struct task_struct *tsk,
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struct stack_trace *trace)
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{
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WARN_ONCE(1, KERN_INFO "save_stack_tsk_reliable() not implemented yet.\n");
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return -ENOSYS;
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}
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