asmlinkage long xtensa_rt_sigreturn()

in kernel/signal.c [247:283]

• 25 lines of code
• 6 McCabe index (conditional complexity)

asmlinkage long xtensa_rt_sigreturn(void)
{
	struct pt_regs *regs = current_pt_regs();
	struct rt_sigframe __user *frame;
	sigset_t set;
	int ret;

	/* Always make any pending restarted system calls return -EINTR */
	current->restart_block.fn = do_no_restart_syscall;

	if (regs->depc > 64)
		panic("rt_sigreturn in double exception!\n");

	frame = (struct rt_sigframe __user *) regs->areg[1];

	if (!access_ok(frame, sizeof(*frame)))
		goto badframe;

	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
		goto badframe;

	set_current_blocked(&set);

	if (restore_sigcontext(regs, frame))
		goto badframe;

	ret = regs->areg[2];

	if (restore_altstack(&frame->uc.uc_stack))
		goto badframe;

	return ret;

badframe:
	force_sig(SIGSEGV);
	return 0;
}