static int setup_rt_frame()

in kernel/signal.c [180:216]

• 26 lines of code
• 3 McCabe index (conditional complexity)

static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
			  struct pt_regs *regs)
{
	struct rt_sigframe *frame;
	int err = 0;

	frame = get_sigframe(ksig, regs, sizeof(*frame));

	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
		err |= copy_siginfo_to_user(&frame->info, &ksig->info);

	/* Create the ucontext.  */
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
	err |= rt_setup_ucontext(&frame->uc, regs);
	err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));

	if (err)
		goto give_sigsegv;

	/* Set up to return from userspace; jump to fixed address sigreturn
	   trampoline on kuser page.  */
	regs->ra = (unsigned long) (0x1044);

	/* Set up registers for signal handler */
	regs->sp = (unsigned long) frame;
	regs->r4 = (unsigned long) ksig->sig;
	regs->r5 = (unsigned long) &frame->info;
	regs->r6 = (unsigned long) &frame->uc;
	regs->ea = (unsigned long) ksig->ka.sa.sa_handler;
	return 0;

give_sigsegv:
	force_sigsegv(ksig->sig);
	return -EFAULT;
}