patch-2.4.19 linux-2.4.19/arch/ppc64/kernel/signal.c

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diff -urN linux-2.4.18/arch/ppc64/kernel/signal.c linux-2.4.19/arch/ppc64/kernel/signal.c
@@ -0,0 +1,790 @@
+/*
+ *  linux/arch/ppc64/kernel/signal.c
+ *
+ *  
+ *
+ *  PowerPC version 
+ *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ *  Derived from "arch/i386/kernel/signal.c"
+ *    Copyright (C) 1991, 1992 Linus Torvalds
+ *    1997-11-28  Modified for POSIX.1b signals by Richard Henderson
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/elf.h>
+#include <asm/ppc32.h>
+#include <asm/sigcontext.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/ppcdebug.h>
+#include <asm/unistd.h>
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+#ifndef MIN
+#define MIN(a,b) (((a) < (b)) ? (a) : (b))
+#endif
+
+#define GP_REGS_SIZE	MIN(sizeof(elf_gregset_t), sizeof(struct pt_regs))
+
+/* 
+ * These are the flags in the MSR that the user is allowed to change
+ * by modifying the saved value of the MSR on the stack.  SE and BE
+ * should not be in this list since gdb may want to change these.  I.e,
+ * you should be able to step out of a signal handler to see what
+ * instruction executes next after the signal handler completes.
+ * Alternately, if you stepped into a signal handler, you should be
+ * able to continue 'til the next breakpoint from within the signal
+ * handler, even if the handler returns.
+ */
+#define MSR_USERCHANGE	(MSR_FE0 | MSR_FE1)
+
+int do_signal(sigset_t *oldset, struct pt_regs *regs);
+extern long sys_wait4(pid_t pid, unsigned int *stat_addr,
+		     int options, /*unsigned long*/ struct rusage *ru);
+
+int copy_siginfo_to_user(siginfo_t *to, siginfo_t *from)
+{
+	if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t)))
+		return -EFAULT;
+	if (from->si_code < 0)
+		return __copy_to_user(to, from, sizeof(siginfo_t));
+	else {
+		int err;
+
+		/* If you change siginfo_t structure, please be sure
+		   this code is fixed accordingly.
+		   It should never copy any pad contained in the structure
+		   to avoid security leaks, but must copy the generic
+		   3 ints plus the relevant union member.  */
+		err = __put_user(from->si_signo, &to->si_signo);
+		err |= __put_user(from->si_errno, &to->si_errno);
+		err |= __put_user((short)from->si_code, &to->si_code);
+		/* First 32bits of unions are always present.  */
+		err |= __put_user(from->si_pid, &to->si_pid);
+		switch (from->si_code >> 16) {
+		case __SI_FAULT >> 16:
+			break;
+		case __SI_CHLD >> 16:
+			err |= __put_user(from->si_utime, &to->si_utime);
+			err |= __put_user(from->si_stime, &to->si_stime);
+			err |= __put_user(from->si_status, &to->si_status);
+		default:
+			err |= __put_user(from->si_uid, &to->si_uid);
+			break;
+		/* case __SI_RT: This is not generated by the kernel as of now.  */
+		}
+		return err;
+	}
+}
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+long sys_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7,
+	       struct pt_regs *regs)
+{
+	sigset_t saveset;
+  
+        PPCDBG(PPCDBG_SYS64X, "sys_sigsuspend - running - pid=%ld current=%lx comm=%s \n",
+                current->pid, current, current->comm);
+
+
+
+	mask &= _BLOCKABLE;
+	spin_lock_irq(&current->sigmask_lock);
+	saveset = current->blocked;
+	siginitset(&current->blocked, mask);
+	recalc_sigpending(current);
+	spin_unlock_irq(&current->sigmask_lock);
+
+	regs->gpr[3] = -EINTR;
+	while (1) {
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		if (do_signal(&saveset, regs))
+			/*
+			 * If a signal handler needs to be called,
+			 * do_signal() has set R3 to the signal number (the
+			 * first argument of the signal handler), so don't
+			 * overwrite that with EINTR !
+			 * In the other cases, do_signal() doesn't touch 
+			 * R3, so it's still set to -EINTR (see above).
+			 */
+			return regs->gpr[3];
+	}
+}
+
+long sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, int p3, int p4, int p6,
+		  int p7, struct pt_regs *regs)
+{
+	sigset_t saveset, newset;
+
+  
+        PPCDBG(PPCDBG_SYS64X, "sys_rt_sigsuspend - running - pid=%ld current=%lx comm=%s \n",
+                current->pid, current, current->comm);
+	
+  /* XXX: Don't preclude handling different sized sigset_t's.  */
+	if (sigsetsize != sizeof(sigset_t))
+		return -EINVAL;
+
+	if (copy_from_user(&newset, unewset, sizeof(newset)))
+		return -EFAULT;
+	sigdelsetmask(&newset, ~_BLOCKABLE);
+
+	spin_lock_irq(&current->sigmask_lock);
+	saveset = current->blocked;
+	current->blocked = newset;
+	recalc_sigpending(current);
+	spin_unlock_irq(&current->sigmask_lock);
+
+	regs->gpr[3] = -EINTR;
+	while (1) {
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		if (do_signal(&saveset, regs))
+			return regs->gpr[3];
+	}
+}
+
+
+
+asmlinkage long sys_sigaltstack(const stack_t *uss, stack_t *uoss)
+{
+  struct pt_regs *regs = (struct pt_regs *) &uss;
+  
+  PPCDBG(PPCDBG_SYS64X, "sys_sigaltstack - running - pid=%ld current=%lx comm=%s \n",
+          current->pid, current, current->comm);
+
+  return do_sigaltstack(uss, uoss, regs->gpr[1]);
+}
+
+long sys_sigaction(int sig, const struct old_sigaction *act,
+	      struct old_sigaction *oact)
+{
+	struct k_sigaction new_ka, old_ka;
+	int ret;
+
+        PPCDBG(PPCDBG_SYS64X, "sys_sigaction - running - pid=%ld current=%lx comm=%s \n",
+                current->pid, current, current->comm);
+
+ 
+
+	if (act) {
+		old_sigset_t mask;
+		if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
+		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
+		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+			return -EFAULT;
+		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
+		__get_user(mask, &act->sa_mask);
+		siginitset(&new_ka.sa.sa_mask, mask);
+	}
+
+	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+	if (!ret && oact) {
+		if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
+		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
+		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+			return -EFAULT;
+		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
+	}
+
+
+ 
+
+	return ret;
+}
+
+/*
+ * When we have signals to deliver, we set up on the
+ * user stack, going down from the original stack pointer:
+ *	a sigregs struct
+ *	one or more sigcontext structs
+ *	a gap of __SIGNAL_FRAMESIZE bytes
+ *
+ * Each of these things must be a multiple of 16 bytes in size.
+ *
+ * XXX ultimately we will have to stack up a siginfo and ucontext
+ * for each rt signal.
+ */
+struct sigregs {
+	elf_gregset_t	gp_regs;
+	double		fp_regs[ELF_NFPREG];
+	unsigned int	tramp[2];
+	/* 64 bit API allows for 288 bytes below sp before 
+	   decrementing it. */
+	int		abigap[72];
+};
+
+
+
+struct rt_sigframe
+{
+	unsigned long	_unused[2];
+	struct siginfo *pinfo;
+	void *puc;
+	struct siginfo info;
+	struct ucontext uc;
+};
+
+
+/*
+ *  When we have rt signals to deliver, we set up on the
+ *  user stack, going down from the original stack pointer:
+ *	   a sigregs struct
+ *	   one rt_sigframe struct (siginfo + ucontext)
+ *	   a gap of __SIGNAL_FRAMESIZE bytes
+ *
+ *  Each of these things must be a multiple of 16 bytes in size.
+ *
+ */
+
+int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
+		     unsigned long r6, unsigned long r7, unsigned long r8,
+		     struct pt_regs *regs)
+{
+	struct rt_sigframe *rt_sf;
+	struct sigcontext_struct sigctx;
+	struct sigregs *sr;
+	int ret;
+	elf_gregset_t saved_regs;  /* an array of ELF_NGREG unsigned longs */
+	sigset_t set;
+	stack_t st;
+	unsigned long prevsp;
+
+	rt_sf = (struct rt_sigframe *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
+	if (copy_from_user(&sigctx, &rt_sf->uc.uc_mcontext, sizeof(sigctx))
+	    || copy_from_user(&set, &rt_sf->uc.uc_sigmask, sizeof(set))
+	    || copy_from_user(&st, &rt_sf->uc.uc_stack, sizeof(st)))
+		goto badframe;
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sigmask_lock);
+	current->blocked = set;
+	recalc_sigpending(current);
+	spin_unlock_irq(&current->sigmask_lock);
+
+	rt_sf++;			/* Look at next rt_sigframe */
+	if (rt_sf == (struct rt_sigframe *)(sigctx.regs)) {
+		/* Last stacked signal - restore registers -
+		 * sigctx is initialized to point to the 
+		 * preamble frame (where registers are stored) 
+		 * see handle_signal()
+		 */
+		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;
+		/* This function sets back the stack flags into
+		   the current task structure.  */
+		sys_sigaltstack(&st, NULL);
+
+		ret = regs->result;
+	} else {
+		/* More signals to go */
+		/* Set up registers for next signal handler */
+		regs->gpr[1] = (unsigned long)rt_sf - __SIGNAL_FRAMESIZE;
+		if (copy_from_user(&sigctx, &rt_sf->uc.uc_mcontext, sizeof(sigctx)))
+			goto badframe;
+		sr = (struct sigregs *) sigctx.regs;
+		regs->gpr[3] = ret = sigctx.signal;
+		/* Get the siginfo   */
+		get_user(regs->gpr[4], (unsigned long *)&rt_sf->pinfo);
+		/* Get the ucontext */
+		get_user(regs->gpr[5], (unsigned long *)&rt_sf->puc);
+		regs->gpr[6] = (unsigned long) rt_sf;
+
+		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);
+}
+
+static void
+setup_rt_frame(struct pt_regs *regs, struct sigregs *frame,
+	       signed long newsp)
+{
+	struct rt_sigframe *rt_sf = (struct rt_sigframe *) 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;
+
+	/* Set up preamble frame */
+	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_rt_sigreturn, &frame->tramp[0])	/* li r0, __NR_rt_sigreturn */
+	    || __put_user(0x44000002UL, &frame->tramp[1]))	/* sc */
+		goto badframe;
+	flush_icache_range((unsigned long) &frame->tramp[0],
+			   (unsigned long) &frame->tramp[2]);
+
+	/* Retrieve rt_sigframe from stack and
+	   set up registers for signal handler
+	*/
+	newsp -= __SIGNAL_FRAMESIZE;
+
+        if ( get_user(temp_ptr, &rt_sf->uc.uc_mcontext.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], &rt_sf->uc.uc_mcontext.signal)
+	    || get_user(regs->gpr[4], (unsigned long *)&rt_sf->pinfo)
+	    || get_user(regs->gpr[5], (unsigned long *)&rt_sf->puc))
+		goto badframe;
+
+	regs->gpr[1] = newsp;
+	regs->gpr[6] = (unsigned long) rt_sf;
+	regs->link = (unsigned long) frame->tramp;
+
+	
+	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 void
+setup_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 void
+handle_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);
+  
+        PPCDBG(PPCDBG_SIGNAL, "do_signal - running - pid=%ld current=%lx comm=%s \n", 
+               current->pid, current, current->comm);
+
+  
+
+        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:
+				continue;
+
+			case SIGTSTP: case SIGTTIN: case SIGTTOU:
+				if (is_orphaned_pgrp(current->pgrp))
+					continue;
+				/* FALLTHRU */
+
+			case SIGSTOP:
+				current->state = TASK_STOPPED;
+				current->exit_code = signr;
+				if (!(current->p_pptr->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:
+				sigaddset(&current->pending.signal, signr);
+				recalc_sigpending(current);
+				current->flags |= PF_SIGNALED;
+				do_exit(exit_code);
+				/* 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;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)