stacktrace.c 2.0 KB
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/*
 * Stack trace management functions
 *
 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 */
#include <linux/sched.h>
#include <linux/stacktrace.h>
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#include <linux/module.h>
#include <asm/stacktrace.h>
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static void save_stack_warning(void *data, char *msg)
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{
}

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static void
save_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
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{
}

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static int save_stack_stack(void *data, char *name)
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{
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	return -1;
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}
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static void save_stack_address(void *data, unsigned long addr, int reliable)
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{
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	struct stack_trace *trace = data;
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	if (!reliable)
		return;
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	if (trace->skip > 0) {
		trace->skip--;
		return;
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	}
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	if (trace->nr_entries < trace->max_entries)
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		trace->entries[trace->nr_entries++] = addr;
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}

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static void
save_stack_address_nosched(void *data, unsigned long addr, int reliable)
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{
	struct stack_trace *trace = (struct stack_trace *)data;
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	if (!reliable)
		return;
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	if (in_sched_functions(addr))
		return;
	if (trace->skip > 0) {
		trace->skip--;
		return;
	}
	if (trace->nr_entries < trace->max_entries)
		trace->entries[trace->nr_entries++] = addr;
}

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static const struct stacktrace_ops save_stack_ops = {
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	.warning = save_stack_warning,
	.warning_symbol = save_stack_warning_symbol,
	.stack = save_stack_stack,
	.address = save_stack_address,
};
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static const struct stacktrace_ops save_stack_ops_nosched = {
	.warning = save_stack_warning,
	.warning_symbol = save_stack_warning_symbol,
	.stack = save_stack_stack,
	.address = save_stack_address_nosched,
};

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/*
 * Save stack-backtrace addresses into a stack_trace buffer.
 */
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void save_stack_trace(struct stack_trace *trace)
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{
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	dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace);
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	if (trace->nr_entries < trace->max_entries)
		trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
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	dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
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	if (trace->nr_entries < trace->max_entries)
		trace->entries[trace->nr_entries++] = ULONG_MAX;
}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);