Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 664 insertions, 0 deletions

diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
new file mode 100644
index 000000000000..9421bb98ea63
--- /dev/null
+++ b/arch/parisc/kernel/signal.c
@@ -0,0 +1,664 @@
+/*
+ *  linux/arch/parisc/kernel/signal.c: Architecture-specific signal
+ *  handling support.
+ *
+ *  Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
+ *  Copyright (C) 2000 Linuxcare, Inc.
+ *
+ *  Based on the ia64, i386, and alpha versions.
+ *
+ *  Like the IA-64, we are a recent enough port (we are *starting*
+ *  with glibc2.2) that we do not need to support the old non-realtime
+ *  Linux signals.  Therefore we don't.  HP/UX signals will go in
+ *  arch/parisc/hpux/signal.c when we figure out how to do them.
+ */
+
+#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/compat.h>
+#include <linux/elf.h>
+#include <linux/personality.h>
+#include <asm/ucontext.h>
+#include <asm/rt_sigframe.h>
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+#include <asm/cacheflush.h>
+#include <asm/offsets.h>
+
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+#include "signal32.h"
+#endif
+
+#define DEBUG_SIG 0 
+#define DEBUG_SIG_LEVEL 2
+
+#if DEBUG_SIG
+#define DBG(LEVEL, ...) \
+        ((DEBUG_SIG_LEVEL >= LEVEL) \
+	? printk(__VA_ARGS__) : (void) 0)
+#else
+#define DBG(LEVEL, ...)
+#endif
+	
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+/* gcc will complain if a pointer is cast to an integer of different
+ * size.  If you really need to do this (and we do for an ELF32 user
+ * application in an ELF64 kernel) then you have to do a cast to an
+ * integer of the same size first.  The A() macro accomplishes
+ * this. */
+#define A(__x)	((unsigned long)(__x))
+
+int do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall);
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+#ifdef __LP64__
+#include "sys32.h"
+#endif
+
+asmlinkage int
+sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs)
+{
+	sigset_t saveset, newset;
+#ifdef __LP64__
+	compat_sigset_t newset32;
+
+	if(personality(current->personality) == PER_LINUX32){
+		/* XXX: Don't preclude handling different sized sigset_t's.  */
+		if (sigsetsize != sizeof(compat_sigset_t))
+			return -EINVAL;
+		if (copy_from_user(&newset32, (compat_sigset_t __user *)unewset, sizeof(newset32)))
+			return -EFAULT;
+		sigset_32to64(&newset,&newset32);
+		
+	} else 
+#endif
+	{
+		/* 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->sighand->siglock);
+	saveset = current->blocked;
+	current->blocked = newset;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	regs->gr[28] = -EINTR;
+	while (1) {
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		if (do_signal(&saveset, regs, 1))
+			return -EINTR;
+	}
+}
+
+/*
+ * Do a signal return - restore sigcontext.
+ */
+
+/* Trampoline for calling rt_sigreturn() */
+#define INSN_LDI_R25_0	 0x34190000 /* ldi  0,%r25 (in_syscall=0) */
+#define INSN_LDI_R25_1	 0x34190002 /* ldi  1,%r25 (in_syscall=1) */
+#define INSN_LDI_R20	 0x3414015a /* ldi  __NR_rt_sigreturn,%r20 */
+#define INSN_BLE_SR2_R0  0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */
+#define INSN_NOP	 0x08000240 /* nop */
+/* For debugging */
+#define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */
+
+static long
+restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
+{
+	long err = 0;
+
+	err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr));
+	err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
+	err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq));
+	err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq));
+	err |= __get_user(regs->sar, &sc->sc_sar);
+	DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n", 
+			regs->iaoq[0],regs->iaoq[1]);
+	DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]);
+	return err;
+}
+
+void
+sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
+{
+	struct rt_sigframe __user *frame;
+	struct siginfo si;
+	sigset_t set;
+	unsigned long usp = (regs->gr[30] & ~(0x01UL));
+	unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE;
+#ifdef __LP64__
+	compat_sigset_t compat_set;
+	struct compat_rt_sigframe __user * compat_frame;
+	
+	if(personality(current->personality) == PER_LINUX32)
+		sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
+#endif
+
+
+	/* Unwind the user stack to get the rt_sigframe structure. */
+	frame = (struct rt_sigframe __user *)
+		(usp - sigframe_size);
+	DBG(2,"sys_rt_sigreturn: frame is %p\n", frame);
+
+#ifdef __LP64__
+	compat_frame = (struct compat_rt_sigframe __user *)frame;
+	
+	if(personality(current->personality) == PER_LINUX32){
+		DBG(2,"sys_rt_sigreturn: ELF32 process.\n");
+		if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set)))
+			goto give_sigsegv;
+		sigset_32to64(&set,&compat_set);
+	} else
+#endif
+	{
+		if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+			goto give_sigsegv;
+	}
+		
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	/* Good thing we saved the old gr[30], eh? */
+#ifdef __LP64__
+	if(personality(current->personality) == PER_LINUX32){
+		DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n",
+				&compat_frame->uc.uc_mcontext);
+// FIXME: Load upper half from register file
+		if (restore_sigcontext32(&compat_frame->uc.uc_mcontext, 
+					&compat_frame->regs, regs))
+			goto give_sigsegv;
+		DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", 
+				usp, &compat_frame->uc.uc_stack);
+		if (do_sigaltstack32(&compat_frame->uc.uc_stack, NULL, usp) == -EFAULT)
+			goto give_sigsegv;
+	} else
+#endif
+	{
+		DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n",
+				&frame->uc.uc_mcontext);
+		if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
+			goto give_sigsegv;
+		DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", 
+				usp, &frame->uc.uc_stack);
+		if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
+			goto give_sigsegv;
+	}
+		
+
+
+	/* If we are on the syscall path IAOQ will not be restored, and
+	 * if we are on the interrupt path we must not corrupt gr31.
+	 */
+	if (in_syscall)
+		regs->gr[31] = regs->iaoq[0];
+#if DEBUG_SIG
+	DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]);
+	show_regs(regs);
+#endif
+	return;
+
+give_sigsegv:
+	DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n");
+	si.si_signo = SIGSEGV;
+	si.si_errno = 0;
+	si.si_code = SI_KERNEL;
+	si.si_pid = current->pid;
+	si.si_uid = current->uid;
+	si.si_addr = &frame->uc;
+	force_sig_info(SIGSEGV, &si, current);
+	return;
+}
+
+/*
+ * Set up a signal frame.
+ */
+
+static inline void __user *
+get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
+{
+	/*FIXME: ELF32 vs. ELF64 has different frame_size, but since we
+	  don't use the parameter it doesn't matter */
+
+	DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n",
+			(unsigned long)ka, sp, frame_size);
+	
+	if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp))
+		sp = current->sas_ss_sp; /* Stacks grow up! */
+
+	DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp);
+	return (void __user *) sp; /* Stacks grow up.  Fun. */
+}
+
+static long
+setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall)
+		 
+{
+	unsigned long flags = 0;
+	long err = 0;
+
+	if (on_sig_stack((unsigned long) sc))
+		flags |= PARISC_SC_FLAG_ONSTACK;
+	if (in_syscall) {
+		flags |= PARISC_SC_FLAG_IN_SYSCALL;
+		/* regs->iaoq is undefined in the syscall return path */
+		err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]);
+		err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]);
+		err |= __put_user(regs->sr[3], &sc->sc_iasq[0]);
+		err |= __put_user(regs->sr[3], &sc->sc_iasq[1]);
+		DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n",
+			regs->gr[31], regs->gr[31]+4);
+	} else {
+		err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq));
+		err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq));
+		DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n", 
+			regs->iaoq[0], regs->iaoq[1]);
+	}
+
+	err |= __put_user(flags, &sc->sc_flags);
+	err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr));
+	err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
+	err |= __put_user(regs->sar, &sc->sc_sar);
+	DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]);
+
+	return err;
+}
+
+static long
+setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+	       sigset_t *set, struct pt_regs *regs, int in_syscall)
+{
+	struct rt_sigframe __user *frame;
+	unsigned long rp, usp;
+	unsigned long haddr, sigframe_size;
+	struct siginfo si;
+	int err = 0;
+#ifdef __LP64__
+	compat_int_t compat_val;
+	struct compat_rt_sigframe __user * compat_frame;
+	compat_sigset_t compat_set;
+#endif
+	
+	usp = (regs->gr[30] & ~(0x01UL));
+	/*FIXME: frame_size parameter is unused, remove it. */
+	frame = get_sigframe(ka, usp, sizeof(*frame));
+
+	DBG(1,"SETUP_RT_FRAME: START\n");
+	DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info);
+
+	
+#ifdef __LP64__
+
+	compat_frame = (struct compat_rt_sigframe __user *)frame;
+	
+	if(personality(current->personality) == PER_LINUX32) {
+		DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
+		err |= compat_copy_siginfo_to_user(&compat_frame->info, info);
+		DBG(1,"SETUP_RT_FRAME: 1\n");
+		compat_val = (compat_int_t)current->sas_ss_sp;
+		err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp);
+		DBG(1,"SETUP_RT_FRAME: 2\n");
+		compat_val = (compat_int_t)current->sas_ss_size;
+		err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_size);
+		DBG(1,"SETUP_RT_FRAME: 3\n");
+		compat_val = sas_ss_flags(regs->gr[30]);		
+		err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_flags);		
+		DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc);
+		DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext);
+		err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext, 
+					&compat_frame->regs, regs, in_syscall);
+		sigset_64to32(&compat_set,set);
+		err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set));
+	} else
+#endif
+	{	
+		DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info);
+		err |= copy_siginfo_to_user(&frame->info, info);
+		err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+		err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+		err |= __put_user(sas_ss_flags(regs->gr[30]),
+				  &frame->uc.uc_stack.ss_flags);
+		DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc);
+		DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext);
+		err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
+		/* FIXME: Should probably be converted aswell for the compat case */
+		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. The first words of tramp are used to
+	   save the previous sigrestartblock trampoline that might be
+	   on the stack. We start the sigreturn trampoline at 
+	   SIGRESTARTBLOCK_TRAMP+X. */
+	err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0,
+			&frame->tramp[SIGRESTARTBLOCK_TRAMP+0]);
+	err |= __put_user(INSN_LDI_R20, 
+			&frame->tramp[SIGRESTARTBLOCK_TRAMP+1]);
+	err |= __put_user(INSN_BLE_SR2_R0, 
+			&frame->tramp[SIGRESTARTBLOCK_TRAMP+2]);
+	err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]);
+
+#if DEBUG_SIG
+	/* Assert that we're flushing in the correct space... */
+	{
+		int sid;
+		asm ("mfsp %%sr3,%0" : "=r" (sid));
+		DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n",
+		       sid, frame->tramp);
+	}
+#endif
+
+	flush_user_dcache_range((unsigned long) &frame->tramp[0],
+			   (unsigned long) &frame->tramp[TRAMP_SIZE]);
+	flush_user_icache_range((unsigned long) &frame->tramp[0],
+			   (unsigned long) &frame->tramp[TRAMP_SIZE]);
+
+	/* TRAMP Words 0-4, Lenght 5 = SIGRESTARTBLOCK_TRAMP
+	 * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP
+	 * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP
+	 */
+	rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP];
+
+	if (err)
+		goto give_sigsegv;
+
+	haddr = A(ka->sa.sa_handler);
+	/* The sa_handler may be a pointer to a function descriptor */
+#ifdef __LP64__
+	if(personality(current->personality) == PER_LINUX32) {
+#endif
+		if (haddr & PA_PLABEL_FDESC) {
+			Elf32_Fdesc fdesc;
+			Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3);
+
+			err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
+
+			if (err)
+				goto give_sigsegv;
+
+			haddr = fdesc.addr;
+			regs->gr[19] = fdesc.gp;
+		}
+#ifdef __LP64__
+	} else {
+		Elf64_Fdesc fdesc;
+		Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3);
+		
+		err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
+		
+		if (err)
+			goto give_sigsegv;
+		
+		haddr = fdesc.addr;
+		regs->gr[19] = fdesc.gp;
+		DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
+		     haddr, regs->gr[19], in_syscall);
+	}
+#endif
+
+	/* The syscall return path will create IAOQ values from r31.
+	 */
+	sigframe_size = PARISC_RT_SIGFRAME_SIZE;
+#ifdef __LP64__
+	if(personality(current->personality) == PER_LINUX32)
+		sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
+#endif
+	if (in_syscall) {
+		regs->gr[31] = haddr;
+#ifdef __LP64__
+		if(personality(current->personality) == PER_LINUX)
+			sigframe_size |= 1;
+#endif
+	} else {
+		unsigned long psw = USER_PSW;
+#ifdef __LP64__
+		if(personality(current->personality) == PER_LINUX)
+			psw |= PSW_W;
+#endif
+
+		/* If we are singlestepping, arrange a trap to be delivered
+		   when we return to userspace. Note the semantics -- we
+		   should trap before the first insn in the handler is
+		   executed. Ref:
+			http://sources.redhat.com/ml/gdb/2004-11/msg00245.html
+		 */
+		if (pa_psw(current)->r) {
+			pa_psw(current)->r = 0;
+			psw |= PSW_R;
+			mtctl(-1, 0);
+		}
+
+		regs->gr[0] = psw;
+		regs->iaoq[0] = haddr | 3;
+		regs->iaoq[1] = regs->iaoq[0] + 4;
+	}
+
+	regs->gr[2]  = rp;                /* userland return pointer */
+	regs->gr[26] = sig;               /* signal number */
+	
+#ifdef __LP64__
+	if(personality(current->personality) == PER_LINUX32){
+		regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */
+		regs->gr[24] = A(&compat_frame->uc);   /* ucontext pointer */
+	} else
+#endif
+	{		
+		regs->gr[25] = A(&frame->info); /* siginfo pointer */
+		regs->gr[24] = A(&frame->uc);   /* ucontext pointer */
+	}
+	
+	DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n",
+	       regs->gr[30], sigframe_size,
+	       regs->gr[30] + sigframe_size);
+	/* Raise the user stack pointer to make a proper call frame. */
+	regs->gr[30] = (A(frame) + sigframe_size);
+
+
+	DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
+	       current->comm, current->pid, frame, regs->gr[30],
+	       regs->iaoq[0], regs->iaoq[1], rp);
+
+	return 1;
+
+give_sigsegv:
+	DBG(1,"setup_rt_frame: sending SIGSEGV\n");
+	if (sig == SIGSEGV)
+		ka->sa.sa_handler = SIG_DFL;
+	si.si_signo = SIGSEGV;
+	si.si_errno = 0;
+	si.si_code = SI_KERNEL;
+	si.si_pid = current->pid;
+	si.si_uid = current->uid;
+	si.si_addr = frame;
+	force_sig_info(SIGSEGV, &si, current);
+	return 0;
+}
+
+/*
+ * OK, we're invoking a handler.
+ */	
+
+static long
+handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
+		sigset_t *oldset, struct pt_regs *regs, int in_syscall)
+{
+	DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n",
+	       sig, ka, info, oldset, regs);
+	
+	/* Set up the stack frame */
+	if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall))
+		return 0;
+
+	if (!(ka->sa.sa_flags & SA_NODEFER)) {
+		spin_lock_irq(&current->sighand->siglock);
+		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+		sigaddset(&current->blocked,sig);
+		recalc_sigpending();
+		spin_unlock_irq(&current->sighand->siglock);
+	}
+	return 1;
+}
+
+/*
+ * 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.
+ *
+ * We need to be able to restore the syscall arguments (r21-r26) to
+ * restart syscalls.  Thus, the syscall path should save them in the
+ * pt_regs structure (it's okay to do so since they are caller-save
+ * registers).  As noted below, the syscall number gets restored for
+ * us due to the magic of delayed branching.
+ */
+
+asmlinkage int
+do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall)
+{
+	siginfo_t info;
+	struct k_sigaction ka;
+	int signr;
+
+	DBG(1,"\ndo_signal: oldset=0x%p, regs=0x%p, sr7 %#lx, in_syscall=%d\n",
+	       oldset, regs, regs->sr[7], in_syscall);
+
+	/* Everyone else checks to see if they are in kernel mode at
+	   this point and exits if that's the case.  I'm not sure why
+	   we would be called in that case, but for some reason we
+	   are. */
+
+	if (!oldset)
+		oldset = &current->blocked;
+
+	DBG(1,"do_signal: oldset %08lx / %08lx\n", 
+		oldset->sig[0], oldset->sig[1]);
+
+
+	/* May need to force signal if handle_signal failed to deliver */
+	while (1) {
+	  
+		signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+		DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); 
+	
+		if (signr <= 0)
+		  break;
+		
+		/* Restart a system call if necessary. */
+		if (in_syscall) {
+			/* Check the return code */
+			switch (regs->gr[28]) {
+		        case -ERESTART_RESTARTBLOCK:
+				current_thread_info()->restart_block.fn = do_no_restart_syscall;
+			case -ERESTARTNOHAND:
+				DBG(1,"ERESTARTNOHAND: returning -EINTR\n");
+				regs->gr[28] = -EINTR;
+				break;
+
+			case -ERESTARTSYS:
+				if (!(ka.sa.sa_flags & SA_RESTART)) {
+					DBG(1,"ERESTARTSYS: putting -EINTR\n");
+					regs->gr[28] = -EINTR;
+					break;
+				}
+			/* fallthrough */
+			case -ERESTARTNOINTR:
+				/* A syscall is just a branch, so all
+				   we have to do is fiddle the return pointer. */
+				regs->gr[31] -= 8; /* delayed branching */
+				/* Preserve original r28. */
+				regs->gr[28] = regs->orig_r28;
+				break;
+			}
+		}
+		/* Whee!  Actually deliver the signal.  If the
+		   delivery failed, we need to continue to iterate in
+		   this loop so we can deliver the SIGSEGV... */
+		if (handle_signal(signr, &info, &ka, oldset, regs, in_syscall)) {
+			DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n",
+				regs->gr[28]);
+			return 1;
+		}
+	}
+	/* end of while(1) looping forever if we can't force a signal */
+
+	/* Did we come from a system call? */
+	if (in_syscall) {
+		/* Restart the system call - no handlers present */
+		if (regs->gr[28] == -ERESTART_RESTARTBLOCK) {
+			unsigned int *usp = (unsigned int *)regs->gr[30];
+
+			/* Setup a trampoline to restart the syscall
+			 * with __NR_restart_syscall
+			 *
+			 *  0: <return address (orig r31)>
+			 *  4: <2nd half for 64-bit>
+			 *  8: ldw 0(%sp), %r31
+			 * 12: be 0x100(%sr2, %r0)
+			 * 16: ldi __NR_restart_syscall, %r20
+			 */
+#ifndef __LP64__
+			put_user(regs->gr[31], &usp[0]);
+			put_user(0x0fc0109f, &usp[2]);
+#else
+			put_user(regs->gr[31] >> 32, &usp[0]);
+			put_user(regs->gr[31] & 0xffffffff, &usp[1]);
+			put_user(0x0fc010df, &usp[2]);
+#endif
+			put_user(0xe0008200, &usp[3]);
+			put_user(0x34140000, &usp[4]);
+
+			/* Stack is 64-byte aligned, and we only 
+			 * need to flush 1 cache line */
+			asm("fdc 0(%%sr3, %0)\n"
+			    "fic 0(%%sr3, %0)\n"
+			    "sync\n"
+			    : : "r"(regs->gr[30]));
+
+			regs->gr[31] = regs->gr[30] + 8;
+			/* Preserve original r28. */
+			regs->gr[28] = regs->orig_r28;
+		} else if (regs->gr[28] == -ERESTARTNOHAND ||
+		           regs->gr[28] == -ERESTARTSYS ||
+		           regs->gr[28] == -ERESTARTNOINTR) {
+			/* Hooray for delayed branching.  We don't
+                           have to restore %r20 (the system call
+                           number) because it gets loaded in the delay
+                           slot of the branch external instruction. */
+			regs->gr[31] -= 8;
+			/* Preserve original r28. */
+			regs->gr[28] = regs->orig_r28;
+		}
+	}
+	
+	DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", 
+		regs->gr[28]);
+
+	return 0;
+}