arch/hexagon/kernel/stacktrace.c

Source file repositories/reference/linux-study-clean/arch/hexagon/kernel/stacktrace.c

File Facts

System
Linux kernel
Corpus path
arch/hexagon/kernel/stacktrace.c
Extension
.c
Size
1133 bytes
Lines
53
Domain
Architecture Layer
Bucket
arch/hexagon
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct stackframe {
	unsigned long fp;
	unsigned long rets;
};

/*
 * Save stack-backtrace addresses into a stack_trace buffer.
 */
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;
	}
}
EXPORT_SYMBOL_GPL(save_stack_trace);

Annotation

Implementation Notes