return;badframe:#if DEBUG_SIG	printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",	       regs, frame, newsp);#endif	do_exit(SIGSEGV);}/* * Do a signal return; undo the signal stack. */long sys_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,		   unsigned long r6, unsigned long r7, unsigned long r8,		   struct pt_regs *regs){	struct sigcontext_struct *sc, sigctx;	struct sigregs *sr;	long ret;	elf_gregset_t saved_regs;  /* an array of ELF_NGREG unsigned longs */	sigset_t set;	unsigned long prevsp;        sc = (struct sigcontext_struct *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);	if (copy_from_user(&sigctx, sc, sizeof(sigctx)))		goto badframe;	set.sig[0] = sigctx.oldmask;#if _NSIG_WORDS > 1	set.sig[1] = sigctx._unused[3];#endif	sigdelsetmask(&set, ~_BLOCKABLE);	spin_lock_irq(&current->sigmask_lock);	current->blocked = set;	recalc_sigpending(current);	spin_unlock_irq(&current->sigmask_lock);	sc++;			/* Look at next sigcontext */	if (sc == (struct sigcontext_struct *)(sigctx.regs)) {		/* Last stacked signal - restore registers */		sr = (struct sigregs *) sigctx.regs;		if (regs->msr & MSR_FP )			giveup_fpu(current);		if (copy_from_user(saved_regs, &sr->gp_regs,				   sizeof(sr->gp_regs)))			goto badframe;		saved_regs[PT_MSR] = (regs->msr & ~MSR_USERCHANGE)			| (saved_regs[PT_MSR] & MSR_USERCHANGE);		saved_regs[PT_SOFTE] = regs->softe;		memcpy(regs, saved_regs, GP_REGS_SIZE);		if (copy_from_user(current->thread.fpr, &sr->fp_regs,				   sizeof(sr->fp_regs)))			goto badframe;		ret = regs->result;	} else {		/* More signals to go */		regs->gpr[1] = (unsigned long)sc - __SIGNAL_FRAMESIZE;		if (copy_from_user(&sigctx, sc, sizeof(sigctx)))			goto badframe;		sr = (struct sigregs *) sigctx.regs;		regs->gpr[3] = ret = sigctx.signal;		regs->gpr[4] = (unsigned long) sc;		regs->link = (unsigned long) &sr->tramp;		regs->nip = sigctx.handler;		if (get_user(prevsp, &sr->gp_regs[PT_R1])		    || put_user(prevsp, (unsigned long *) regs->gpr[1]))			goto badframe;	}	return ret;badframe:	do_exit(SIGSEGV);}	/* * Set up a signal frame. */static voidsetup_frame(struct pt_regs *regs, struct sigregs *frame,            unsigned long newsp){	/* Handler is *really* a pointer to the function descriptor for	 * the signal routine.  The first entry in the function	 * descriptor is the entry address of signal and the second	 * entry is the TOC value we need to use.	 */	struct funct_descr_entry {		unsigned long entry;		unsigned long toc;	};  	struct funct_descr_entry * funct_desc_ptr;	unsigned long temp_ptr;	struct sigcontext_struct *sc = (struct sigcontext_struct *) newsp;  	if (verify_area(VERIFY_WRITE, frame, sizeof(*frame)))		goto badframe;	if (regs->msr & MSR_FP)		giveup_fpu(current);	if (__copy_to_user(&frame->gp_regs, regs, GP_REGS_SIZE)	    || __copy_to_user(&frame->fp_regs, current->thread.fpr,			      ELF_NFPREG * sizeof(double))	    || __put_user(0x38000000UL + __NR_sigreturn, &frame->tramp[0])    /* li r0, __NR_sigreturn */	    || __put_user(0x44000002UL, &frame->tramp[1]))   /* sc */		goto badframe;	flush_icache_range((unsigned long) &frame->tramp[0],			   (unsigned long) &frame->tramp[2]);	newsp -= __SIGNAL_FRAMESIZE;	if ( get_user(temp_ptr, &sc->handler))		goto badframe;  	funct_desc_ptr = ( struct funct_descr_entry *) temp_ptr;	if (put_user(regs->gpr[1], (unsigned long *)newsp)	    || get_user(regs->nip, & funct_desc_ptr ->entry)	    || get_user(regs->gpr[2],& funct_desc_ptr->toc)	    || get_user(regs->gpr[3], &sc->signal))		goto badframe;	regs->gpr[1] = newsp;	regs->gpr[4] = (unsigned long) sc;	regs->link = (unsigned long) frame->tramp;	PPCDBG(PPCDBG_SIGNAL, "setup_frame - returning - regs->gpr[1]=%lx, regs->gpr[4]=%lx, regs->link=%lx \n",	       regs->gpr[1], regs->gpr[4], regs->link);	return; badframe:	PPCDBG(PPCDBG_SIGNAL, "setup_frame - badframe in setup_frame, regs=%p frame=%p newsp=%lx\n", regs, frame, newsp);  PPCDBG_ENTER_DEBUGGER();#if DEBUG_SIG	printk("badframe in setup_frame, regs=%p frame=%p newsp=%lx\n",	       regs, frame, newsp);#endif	do_exit(SIGSEGV);}/* * OK, we're invoking a handler */static voidhandle_signal(unsigned long sig, struct k_sigaction *ka,	      siginfo_t *info, sigset_t *oldset, struct pt_regs * regs,	      unsigned long *newspp, unsigned long frame){	struct sigcontext_struct *sc;        struct rt_sigframe *rt_sf;	if (regs->trap == 0x0C00 /* System Call! */	    && ((int)regs->result == -ERESTARTNOHAND ||		((int)regs->result == -ERESTARTSYS &&		 !(ka->sa.sa_flags & SA_RESTART))))		regs->result = -EINTR;        /* Set up Signal Frame */     	if (ka->sa.sa_flags & SA_SIGINFO) {		/* Put a Real Time Context onto stack */		*newspp -= sizeof(*rt_sf);		rt_sf = (struct rt_sigframe *) *newspp;		if (verify_area(VERIFY_WRITE, rt_sf, sizeof(*rt_sf)))			goto badframe;                		if (__put_user((unsigned long) ka->sa.sa_handler, &rt_sf->uc.uc_mcontext.handler)		    || __put_user(&rt_sf->info, &rt_sf->pinfo)		    || __put_user(&rt_sf->uc, &rt_sf->puc)		    /* Put the siginfo */		    || __copy_to_user(&rt_sf->info, info, sizeof(*info))		    /* Create the ucontext */		    || __put_user(0, &rt_sf->uc.uc_flags)		    || __put_user(0, &rt_sf->uc.uc_link)		    || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)		    || __put_user(sas_ss_flags(regs->gpr[1]), 				  &rt_sf->uc.uc_stack.ss_flags)		    || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)		    || __copy_to_user(&rt_sf->uc.uc_sigmask, oldset, sizeof(*oldset))		    /* mcontext.regs points to preamble register frame */		    || __put_user((struct pt_regs *)frame, &rt_sf->uc.uc_mcontext.regs)		    || __put_user(sig, &rt_sf->uc.uc_mcontext.signal))			goto badframe;               	} else {	        /* Put another sigcontext on the stack */                *newspp -= sizeof(*sc);        	sc = (struct sigcontext_struct *) *newspp;        	if (verify_area(VERIFY_WRITE, sc, sizeof(*sc)))	        	goto badframe;        	if (__put_user((unsigned long) ka->sa.sa_handler, &sc->handler)	           || __put_user(oldset->sig[0], &sc->oldmask)#if _NSIG_WORDS > 1	           || __put_user(oldset->sig[1], &sc->_unused[3])#endif	           || __put_user((struct pt_regs *)frame, &sc->regs)	           || __put_user(sig, &sc->signal))	        	goto badframe;	}	if (ka->sa.sa_flags & SA_ONESHOT)		ka->sa.sa_handler = SIG_DFL;	if (!(ka->sa.sa_flags & SA_NODEFER)) {		spin_lock_irq(&current->sigmask_lock);		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);		sigaddset(&current->blocked,sig);		recalc_sigpending(current);		spin_unlock_irq(&current->sigmask_lock);	}	return;badframe:#if DEBUG_SIG	printk("badframe in handle_signal, regs=%p frame=%lx newsp=%lx\n",	       regs, frame, *newspp);	printk("sc=%p sig=%d ka=%p info=%p oldset=%p\n", sc, sig, ka, info, oldset);#endif	do_exit(SIGSEGV);}/* * 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. */extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);int do_signal(sigset_t *oldset, struct pt_regs *regs){	siginfo_t info;	struct k_sigaction *ka;	unsigned long frame, newsp;	/*	 * If the current thread is 32 bit - invoke the	 * 32 bit signal handling code	 */	if (current->thread.flags & PPC_FLAG_32BIT)		return do_signal32(oldset, regs);        if (!oldset)		oldset = &current->blocked;	newsp = frame = 0;	for (;;) {		unsigned long signr;                PPCDBG(PPCDBG_SIGNAL, "do_signal - (pre) dequeueing signal - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);		spin_lock_irq(&current->sigmask_lock);		signr = dequeue_signal(&current->blocked, &info);		spin_unlock_irq(&current->sigmask_lock);                PPCDBG(PPCDBG_SIGNAL, "do_signal - (aft) dequeueing signal - signal=%lx - pid=%ld current=%lx comm=%s \n", signr, current->pid, current, current->comm);		if (!signr)			break;		if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {			/* Let the debugger run.  */			current->exit_code = signr;			current->state = TASK_STOPPED;			notify_parent(current, SIGCHLD);			schedule();			/* We're back.  Did the debugger cancel the sig?  */			if (!(signr = current->exit_code))				continue;			current->exit_code = 0;			/* The debugger continued.  Ignore SIGSTOP.  */			if (signr == SIGSTOP)				continue;			/* Update the siginfo structure.  Is this good?  */			if (signr != info.si_signo) {				info.si_signo = signr;				info.si_errno = 0;				info.si_code = SI_USER;				info.si_pid = current->p_pptr->pid;				info.si_uid = current->p_pptr->uid;			}			/* If the (new) signal is now blocked, requeue it.  */			if (sigismember(&current->blocked, signr)) {				send_sig_info(signr, &info, current);				continue;			}		}		ka = &current->sig->action[signr-1];                  PPCDBG(PPCDBG_SIGNAL, "do_signal - ka=%p, action handler=%lx \n", ka, ka->sa.sa_handler);		if (ka->sa.sa_handler == SIG_IGN) {                        PPCDBG(PPCDBG_SIGNAL, "do_signal - into SIG_IGN logic \n");			if (signr != SIGCHLD)				continue;			/* Check for SIGCHLD: it's special.  */			while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)				/* nothing */;			continue;		}		if (ka->sa.sa_handler == SIG_DFL) {			int exit_code = signr;                        PPCDBG(PPCDBG_SIGNAL, "do_signal - into SIG_DFL logic \n");			/* Init gets no signals it doesn't want.  */			if (current->pid == 1)				continue;			switch (signr) {			case SIGCONT: case SIGCHLD: case SIGWINCH: case SIGURG:				continue;			case SIGTSTP: case SIGTTIN: case SIGTTOU:				if (is_orphaned_pgrp(current->pgrp))					continue;				/* FALLTHRU */			case SIGSTOP: {				struct signal_struct *sig;				current->state = TASK_STOPPED;				current->exit_code = signr;				sig = current->p_pptr->sig;				if (sig && !(sig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDSTOP))					notify_parent(current, SIGCHLD);				schedule();				continue;			}			case SIGQUIT: case SIGILL: case SIGTRAP:			case SIGABRT: case SIGFPE: case SIGSEGV:			case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:				if (do_coredump(signr, regs))					exit_code |= 0x80;				/* FALLTHRU */			default:				sig_exit(signr, exit_code, &info);				/* NOTREACHED */			}		}		if ( (ka->sa.sa_flags & SA_ONSTACK)		     && (! on_sig_stack(regs->gpr[1])))			newsp = (current->sas_ss_sp + current->sas_ss_size);		else			newsp = regs->gpr[1];		newsp = frame = newsp - sizeof(struct sigregs);		/* Whee!  Actually deliver the signal.  */                  PPCDBG(PPCDBG_SIGNAL, "do_signal - GOING TO RUN SIGNAL HANDLER - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);		handle_signal(signr, ka, &info, oldset, regs, &newsp, frame);                PPCDBG(PPCDBG_SIGNAL, "do_signal - after running signal handler - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);                break;	}	if (regs->trap == 0x0C00 /* System Call! */ &&	    ((int)regs->result == -ERESTARTNOHAND ||	     (int)regs->result == -ERESTARTSYS ||	     (int)regs->result == -ERESTARTNOINTR)) {                PPCDBG(PPCDBG_SIGNAL, "do_signal - going to back up & retry system call \n");		regs->gpr[3] = regs->orig_gpr3;		regs->nip -= 4;		/* Back up & retry system call */		regs->result = 0;	}	if (newsp == frame)          {             PPCDBG(PPCDBG_SIGNAL, "do_signal - returning w/ no signal delivered \n");             return 0;		/* no signals delivered */           }               if (ka->sa.sa_flags & SA_SIGINFO)             setup_rt_frame(regs, (struct sigregs *) frame, newsp);        else        	    setup_frame(regs, (struct sigregs *) frame, newsp);        PPCDBG(PPCDBG_SIGNAL, "do_signal - returning a signal was delivered \n");	return 1;}