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x86: add save_stack_trace_bp() for tracing from a specific stack frame 

This will help kmemcheck (and possibly other debugging tools) since we
can now simply pass regs->bp to the stack tracer instead of specifying
the number of stack frames to skip, which is unreliable if gcc decides
to inline functions, etc.

Note that this makes the API incomplete for other architectures, but I
expect that those can be updated lazily, e.g. when they need it.

Cc: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
This commit is contained in:
Vegard Nossum 2008-05-20 11:15:43 +02:00
parent 8ebf975608
commit acc6be5405
2 changed files with 8 additions and 0 deletions
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7
arch/x86/kernel/stacktrace.c
View File

@ -77,6 +77,13 @@ void save_stack_trace(struct stack_trace *trace)
}
EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_bp(struct stack_trace *trace, unsigned long bp)
{
dump_trace(current, NULL, NULL, bp, &save_stack_ops, trace);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);

1
include/linux/stacktrace.h
View File

@ -11,6 +11,7 @@ struct stack_trace {
};
extern void save_stack_trace(struct stack_trace *trace);
extern void save_stack_trace_bp(struct stack_trace *trace, unsigned long bp);
extern void save_stack_trace_tsk(struct task_struct *tsk,
struct stack_trace *trace);