arch/um/kernel/stacktrace.c

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

File Facts

System
Linux kernel
Corpus path
arch/um/kernel/stacktrace.c
Extension
.c
Size
1855 bytes
Lines
76
Domain
Architecture Layer
Bucket
arch/um
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

if (__kernel_text_address(addr)) {
			reliable = 0;
			if ((unsigned long) sp == bp + sizeof(long)) {
				frame = frame ? frame->next_frame : NULL;
				bp = (unsigned long)frame;
				reliable = 1;
			}
			ops->address(data, addr, reliable);
		}
		sp++;
	}
}

static void save_addr(void *data, unsigned long address, int reliable)
{
	struct stack_trace *trace = data;

	if (!reliable)
		return;
	if (trace->nr_entries >= trace->max_entries)
		return;

	trace->entries[trace->nr_entries++] = address;
}

static const struct stacktrace_ops dump_ops = {
	.address = save_addr
};

static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)
{
	dump_trace(tsk, &dump_ops, trace);
}

void save_stack_trace(struct stack_trace *trace)
{
	__save_stack_trace(current, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace);

void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
	__save_stack_trace(tsk, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);

Annotation

Implementation Notes