bc850d6b37
For enhancing the 32 bit EBP based backtracer, I need the capability for the backtracer to tell it's customer that an entry is either reliable or unreliable, and the backtrace printing code then needs to print the unreliable ones slightly different. This patch adds the basic capability, the next patch will add a user of this capability. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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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/stacktrace.h>
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#include <linux/module.h>
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#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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}
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static void
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save_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
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{
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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 = (struct stack_trace *)data;
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if (trace->skip > 0) {
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trace->skip--;
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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)
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{
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struct stack_trace *trace = (struct stack_trace *)data;
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if (in_sched_functions(addr))
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return;
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if (trace->skip > 0) {
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trace->skip--;
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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 const struct stacktrace_ops save_stack_ops = {
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.warning = save_stack_warning,
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.warning_symbol = save_stack_warning_symbol,
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.stack = save_stack_stack,
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.address = save_stack_address,
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};
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static const struct stacktrace_ops save_stack_ops_nosched = {
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.warning = save_stack_warning,
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.warning_symbol = save_stack_warning_symbol,
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.stack = save_stack_stack,
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.address = save_stack_address_nosched,
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};
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/*
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* Save stack-backtrace addresses into a stack_trace buffer.
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*/
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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, &save_stack_ops, trace);
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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dump_trace(tsk, NULL, NULL, &save_stack_ops_nosched, trace);
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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