From acc6be5405b90c9f0fb0eb8a74ec4d4b7b5bf48f Mon Sep 17 00:00:00 2001 From: Vegard Nossum Date: Tue, 20 May 2008 11:15:43 +0200 Subject: 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 Signed-off-by: Vegard Nossum --- arch/x86/kernel/stacktrace.c | 7 +++++++ include/linux/stacktrace.h | 1 + 2 files changed, 8 insertions(+) diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 4aaf7e48394f..c3eb207181fe 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -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); diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h index 1a8cecc4f38c..551f6c7d5044 100644 --- a/include/linux/stacktrace.h +++ b/include/linux/stacktrace.h @@ -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); -- cgit v1.2.2