goto badframe;	return regs->r10;badframe:	force_sig(SIGSEGV, current);	return 0;}	/* * Set up a signal frame. */static intsetup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask){	int err = 0;	unsigned long usp = rdusp();	/* copy the regs. they are first in sc so we can use sc directly */	err |= __copy_to_user(sc, regs, sizeof(struct pt_regs));        /* Set the frametype to CRIS_FRAME_NORMAL for the execution of           the signal handler. The frametype will be restored to its previous           value in restore_sigcontext. */        regs->frametype = CRIS_FRAME_NORMAL;	/* then some other stuff */	err |= __put_user(mask, &sc->oldmask);	err |= __put_user(usp, &sc->usp);	return err;}/* figure out where we want to put the new signal frame - usually on the stack */static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size){	unsigned long sp = rdusp();	/* This is the X/Open sanctioned signal stack switching.  */	if (ka->sa.sa_flags & SA_ONSTACK) {		if (! on_sig_stack(sp))			sp = current->sas_ss_sp + current->sas_ss_size;	}	/* make sure the frame is dword-aligned */	sp &= ~3;	return (void __user*)(sp - frame_size);}/* grab and setup a signal frame. *  * basically we stack a lot of state info, and arrange for the * user-mode program to return to the kernel using either a * trampoline which performs the syscall sigreturn, or a provided * user-mode trampoline. */static void setup_frame(int sig, struct k_sigaction *ka,			sigset_t *set, struct pt_regs * regs){	struct sigframe __user *frame;	unsigned long return_ip;	int err = 0;	frame = get_sigframe(ka, regs, sizeof(*frame));	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))		goto give_sigsegv;	err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);	if (err)		goto give_sigsegv;	if (_NSIG_WORDS > 1) {		err |= __copy_to_user(frame->extramask, &set->sig[1],				      sizeof(frame->extramask));	}	if (err)		goto give_sigsegv;	/* Set up to return from userspace.  If provided, use a stub	   already in userspace.  */	if (ka->sa.sa_flags & SA_RESTORER) {		return_ip = (unsigned long)ka->sa.sa_restorer;	} else {		/* trampoline - the desired return ip is the retcode itself */		return_ip = (unsigned long)&frame->retcode;		/* This is movu.w __NR_sigreturn, r9; break 13; */		err |= __put_user(0x9c5f,         (short __user*)(frame->retcode+0));		err |= __put_user(__NR_sigreturn, (short __user*)(frame->retcode+2));		err |= __put_user(0xe93d,         (short __user*)(frame->retcode+4));	}	if (err)		goto give_sigsegv;	/* Set up registers for signal handler */	regs->irp = (unsigned long) ka->sa.sa_handler;  /* what we enter NOW   */	regs->srp = return_ip;                          /* what we enter LATER */	regs->r10 = sig;                                /* first argument is signo */	/* actually move the usp to reflect the stacked frame */	wrusp((unsigned long)frame);	return;give_sigsegv:	force_sigsegv(sig, current);}static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,			   sigset_t *set, struct pt_regs * regs){	struct rt_sigframe __user *frame;	unsigned long return_ip;	int err = 0;	frame = get_sigframe(ka, regs, sizeof(*frame));	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))		goto give_sigsegv;	err |= __put_user(&frame->info, &frame->pinfo);	err |= __put_user(&frame->uc, &frame->puc);	err |= copy_siginfo_to_user(&frame->info, info);	if (err)		goto give_sigsegv;	/* Clear all the bits of the ucontext we don't use.  */        err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));	if (err)		goto give_sigsegv;	/* Set up to return from userspace.  If provided, use a stub	   already in userspace.  */	if (ka->sa.sa_flags & SA_RESTORER) {		return_ip = (unsigned long)ka->sa.sa_restorer;	} else {		/* trampoline - the desired return ip is the retcode itself */		return_ip = (unsigned long)&frame->retcode;		/* This is movu.w __NR_rt_sigreturn, r9; break 13; */		err |= __put_user(0x9c5f,            (short __user*)(frame->retcode+0));		err |= __put_user(__NR_rt_sigreturn, (short __user*)(frame->retcode+2));		err |= __put_user(0xe93d,            (short __user*)(frame->retcode+4));	}	if (err)		goto give_sigsegv;	/* TODO what is the current->exec_domain stuff and invmap ? */	/* Set up registers for signal handler */	regs->irp = (unsigned long) ka->sa.sa_handler;  /* what we enter NOW   */	regs->srp = return_ip;                          /* what we enter LATER */	regs->r10 = sig;                                /* first argument is signo */        regs->r11 = (unsigned long) &frame->info;       /* second argument is (siginfo_t *) */        regs->r12 = 0;                                  /* third argument is unused */	/* actually move the usp to reflect the stacked frame */	wrusp((unsigned long)frame);	return;give_sigsegv:	force_sigsegv(sig, current);}/* * OK, we're invoking a handler */	static inline voidhandle_signal(int canrestart, unsigned long sig,	      siginfo_t *info, struct k_sigaction *ka,              sigset_t *oldset, struct pt_regs * regs){	/* Are we from a system call? */	if (canrestart) {		/* If so, check system call restarting.. */		switch (regs->r10) {			case -ERESTART_RESTARTBLOCK:			case -ERESTARTNOHAND:				/* ERESTARTNOHAND means that the syscall should only be				   restarted if there was no handler for the signal, and since				   we only get here if there is a handler, we don't restart */				regs->r10 = -EINTR;				break;			case -ERESTARTSYS:				/* ERESTARTSYS means to restart the syscall if there is no				   handler or the handler was registered with SA_RESTART */				if (!(ka->sa.sa_flags & SA_RESTART)) {					regs->r10 = -EINTR;					break;				}			/* fallthrough */			case -ERESTARTNOINTR:				/* ERESTARTNOINTR means that the syscall should be called again				   after the signal handler returns. */				RESTART_CRIS_SYS(regs);		}	}	/* Set up the stack frame */	if (ka->sa.sa_flags & SA_SIGINFO)		setup_rt_frame(sig, ka, info, oldset, regs);	else		setup_frame(sig, ka, oldset, regs);	if (ka->sa.sa_flags & SA_ONESHOT)		ka->sa.sa_handler = SIG_DFL;	spin_lock_irq(&current->sighand->siglock);	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);	if (!(ka->sa.sa_flags & SA_NODEFER))		sigaddset(&current->blocked,sig);	recalc_sigpending();	spin_unlock_irq(&current->sighand->siglock);}/* * Note that 'init' is a special process: it doesn't get signals it doesn't * want to handle. Thus you cannot kill init even with a SIGKILL even by * mistake. * * Also note that the regs structure given here as an argument, is the latest * pushed pt_regs. It may or may not be the same as the first pushed registers * when the initial usermode->kernelmode transition took place. Therefore * we can use user_mode(regs) to see if we came directly from kernel or user * mode below. */int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs){	siginfo_t info;	int signr;        struct k_sigaction ka;	/*	 * We want the common case to go fast, which	 * is why we may in certain cases get here from	 * kernel mode. Just return without doing anything	 * if so.	 */	if (!user_mode(regs))		return 1;	if (!oldset)		oldset = &current->blocked;	signr = get_signal_to_deliver(&info, &ka, regs, NULL);	if (signr > 0) {		/* Whee!  Actually deliver the signal.  */		handle_signal(canrestart, signr, &info, &ka, oldset, regs);		return 1;	}	/* Did we come from a system call? */	if (canrestart) {		/* Restart the system call - no handlers present */		if (regs->r10 == -ERESTARTNOHAND ||		    regs->r10 == -ERESTARTSYS ||		    regs->r10 == -ERESTARTNOINTR) {			RESTART_CRIS_SYS(regs);		}		if (regs->r10 == -ERESTART_RESTARTBLOCK){			regs->r10 = __NR_restart_syscall;			regs->irp -= 2;		}	}	return 0;}