void save_stack_trace()

in kernel/stacktrace.c [22:51]

• 22 lines of code
• 5 McCabe index (conditional complexity)

void save_stack_trace(struct stack_trace *trace)
{
	unsigned long low, high;
	unsigned long fp;
	struct stackframe *frame;
	int skip = trace->skip;

	low = (unsigned long)task_stack_page(current);
	high = low + THREAD_SIZE;
	fp = (unsigned long)__builtin_frame_address(0);

	while (fp >= low && fp <= (high - sizeof(*frame))) {
		frame = (struct stackframe *)fp;

		if (skip) {
			skip--;
		} else {
			trace->entries[trace->nr_entries++] = frame->rets;
			if (trace->nr_entries >= trace->max_entries)
				break;
		}

		/*
		 * The next frame must be at a higher address than the
		 * current frame.
		 */
		low = fp + sizeof(*frame);
		fp = frame->fp;
	}
}