long arch_ptrace()

in kernel/ptrace.c [276:319]

• 36 lines of code
• 8 McCabe index (conditional complexity)

long arch_ptrace(struct task_struct *child, long request,
		 unsigned long addr, unsigned long data)
{
	unsigned long tmp;
	size_t copied;
	long ret;

	switch (request) {
	/* When I and D space are separate, these will need to be fixed.  */
	case PTRACE_PEEKTEXT: /* read word at location addr. */
	case PTRACE_PEEKDATA:
		copied = ptrace_access_vm(child, addr, &tmp, sizeof(tmp),
				FOLL_FORCE);
		ret = -EIO;
		if (copied != sizeof(tmp))
			break;
		
		force_successful_syscall_return();
		ret = tmp;
		break;

	/* Read register number ADDR. */
	case PTRACE_PEEKUSR:
		force_successful_syscall_return();
		ret = get_reg(child, addr);
		DBG(DBG_MEM, ("peek $%lu->%#lx\n", addr, ret));
		break;

	/* When I and D space are separate, this will have to be fixed.  */
	case PTRACE_POKETEXT: /* write the word at location addr. */
	case PTRACE_POKEDATA:
		ret = generic_ptrace_pokedata(child, addr, data);
		break;

	case PTRACE_POKEUSR: /* write the specified register */
		DBG(DBG_MEM, ("poke $%lu<-%#lx\n", addr, data));
		ret = put_reg(child, addr, data);
		break;
	default:
		ret = ptrace_request(child, request, addr, data);
		break;
	}
	return ret;
}