Linux-2.6.12-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, 688 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c
new file mode 100644
index 000000000000..b27934671c35
--- /dev/null
+++ b/arch/sparc64/kernel/signal.c
@@ -0,0 +1,688 @@
+/*  $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
+ *  arch/sparc64/kernel/signal.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
+ *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/config.h>
+#ifdef CONFIG_SPARC32_COMPAT
+#include <linux/compat.h>	/* for compat_old_sigset_t */
+#endif
+#include <linux/sched.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/mm.h>
+#include <linux/tty.h>
+#include <linux/smp_lock.h>
+#include <linux/binfmts.h>
+#include <linux/bitops.h>
+
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/svr4.h>
+#include <asm/pgtable.h>
+#include <asm/fpumacro.h>
+#include <asm/uctx.h>
+#include <asm/siginfo.h>
+#include <asm/visasm.h>
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+static int do_signal(sigset_t *oldset, struct pt_regs * regs,
+		     unsigned long orig_o0, int ret_from_syscall);
+
+/* {set, get}context() needed for 64-bit SparcLinux userland. */
+asmlinkage void sparc64_set_context(struct pt_regs *regs)
+{
+	struct ucontext __user *ucp = (struct ucontext __user *)
+		regs->u_regs[UREG_I0];
+	mc_gregset_t __user *grp;
+	unsigned long pc, npc, tstate;
+	unsigned long fp, i7;
+	unsigned char fenab;
+	int err;
+
+	flush_user_windows();
+	if (get_thread_wsaved()					||
+	    (((unsigned long)ucp) & (sizeof(unsigned long)-1))	||
+	    (!__access_ok(ucp, sizeof(*ucp))))
+		goto do_sigsegv;
+	grp  = &ucp->uc_mcontext.mc_gregs;
+	err  = __get_user(pc, &((*grp)[MC_PC]));
+	err |= __get_user(npc, &((*grp)[MC_NPC]));
+	if (err || ((pc | npc) & 3))
+		goto do_sigsegv;
+	if (regs->u_regs[UREG_I1]) {
+		sigset_t set;
+
+		if (_NSIG_WORDS == 1) {
+			if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
+				goto do_sigsegv;
+		} else {
+			if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
+				goto do_sigsegv;
+		}
+		sigdelsetmask(&set, ~_BLOCKABLE);
+		spin_lock_irq(&current->sighand->siglock);
+		current->blocked = set;
+		recalc_sigpending();
+		spin_unlock_irq(&current->sighand->siglock);
+	}
+	if (test_thread_flag(TIF_32BIT)) {
+		pc &= 0xffffffff;
+		npc &= 0xffffffff;
+	}
+	regs->tpc = pc;
+	regs->tnpc = npc;
+	err |= __get_user(regs->y, &((*grp)[MC_Y]));
+	err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
+	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
+	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
+	err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
+	err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
+	err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
+	err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
+	err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
+	err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
+	err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
+	err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
+	err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
+	err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
+	err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
+	err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
+	err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
+	err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
+	err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
+
+	err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
+	err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
+	err |= __put_user(fp,
+	      (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
+	err |= __put_user(i7,
+	      (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
+
+	err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
+	if (fenab) {
+		unsigned long *fpregs = current_thread_info()->fpregs;
+		unsigned long fprs;
+		
+		fprs_write(0);
+		err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
+		if (fprs & FPRS_DL)
+			err |= copy_from_user(fpregs,
+					      &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
+					      (sizeof(unsigned int) * 32));
+		if (fprs & FPRS_DU)
+			err |= copy_from_user(fpregs+16,
+			 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
+			 (sizeof(unsigned int) * 32));
+		err |= __get_user(current_thread_info()->xfsr[0],
+				  &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
+		err |= __get_user(current_thread_info()->gsr[0],
+				  &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
+		regs->tstate &= ~TSTATE_PEF;
+	}
+	if (err)
+		goto do_sigsegv;
+
+	return;
+do_sigsegv:
+	force_sig(SIGSEGV, current);
+}
+
+asmlinkage void sparc64_get_context(struct pt_regs *regs)
+{
+	struct ucontext __user *ucp = (struct ucontext __user *)
+		regs->u_regs[UREG_I0];
+	mc_gregset_t __user *grp;
+	mcontext_t __user *mcp;
+	unsigned long fp, i7;
+	unsigned char fenab;
+	int err;
+
+	synchronize_user_stack();
+	if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
+		goto do_sigsegv;
+
+#if 1
+	fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
+#else
+	fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
+#endif
+		
+	mcp = &ucp->uc_mcontext;
+	grp = &mcp->mc_gregs;
+
+	/* Skip over the trap instruction, first. */
+	if (test_thread_flag(TIF_32BIT)) {
+		regs->tpc   = (regs->tnpc & 0xffffffff);
+		regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
+	} else {
+		regs->tpc   = regs->tnpc;
+		regs->tnpc += 4;
+	}
+	err = 0;
+	if (_NSIG_WORDS == 1)
+		err |= __put_user(current->blocked.sig[0],
+				  (unsigned long __user *)&ucp->uc_sigmask);
+	else
+		err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
+				      sizeof(sigset_t));
+
+	err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
+	err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
+	err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
+	err |= __put_user(regs->y, &((*grp)[MC_Y]));
+	err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
+	err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
+	err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
+	err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
+	err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
+	err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
+	err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
+	err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
+	err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
+	err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
+	err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
+	err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
+	err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
+	err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
+	err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
+
+	err |= __get_user(fp,
+		 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
+	err |= __get_user(i7,
+		 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
+	err |= __put_user(fp, &(mcp->mc_fp));
+	err |= __put_user(i7, &(mcp->mc_i7));
+
+	err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
+	if (fenab) {
+		unsigned long *fpregs = current_thread_info()->fpregs;
+		unsigned long fprs;
+		
+		fprs = current_thread_info()->fpsaved[0];
+		if (fprs & FPRS_DL)
+			err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
+					    (sizeof(unsigned int) * 32));
+		if (fprs & FPRS_DU)
+			err |= copy_to_user(
+                          ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
+			  (sizeof(unsigned int) * 32));
+		err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
+		err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
+		err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
+	}
+	if (err)
+		goto do_sigsegv;
+
+	return;
+do_sigsegv:
+	force_sig(SIGSEGV, current);
+}
+
+struct rt_signal_frame {
+	struct sparc_stackf	ss;
+	siginfo_t		info;
+	struct pt_regs		regs;
+	__siginfo_fpu_t __user	*fpu_save;
+	stack_t			stack;
+	sigset_t		mask;
+	__siginfo_fpu_t		fpu_state;
+};
+
+/* Align macros */
+#define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
+
+/*
+ * atomically swap in the new signal mask, and wait for a signal.
+ * This is really tricky on the Sparc, watch out...
+ */
+asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
+{
+	sigset_t saveset;
+
+#ifdef CONFIG_SPARC32_COMPAT
+	if (test_thread_flag(TIF_32BIT)) {
+		extern asmlinkage void _sigpause32_common(compat_old_sigset_t,
+							  struct pt_regs *);
+		_sigpause32_common(set, regs);
+		return;
+	}
+#endif
+	set &= _BLOCKABLE;
+	spin_lock_irq(&current->sighand->siglock);
+	saveset = current->blocked;
+	siginitset(&current->blocked, set);
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+	
+	if (test_thread_flag(TIF_32BIT)) {
+		regs->tpc = (regs->tnpc & 0xffffffff);
+		regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
+	} else {
+		regs->tpc = regs->tnpc;
+		regs->tnpc += 4;
+	}
+
+	/* Condition codes and return value where set here for sigpause,
+	 * and so got used by setup_frame, which again causes sigreturn()
+	 * to return -EINTR.
+	 */
+	while (1) {
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		/*
+		 * Return -EINTR and set condition code here,
+		 * so the interrupted system call actually returns
+		 * these.
+		 */
+		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
+		regs->u_regs[UREG_I0] = EINTR;
+		if (do_signal(&saveset, regs, 0, 0))
+			return;
+	}
+}
+
+asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
+{
+	_sigpause_common(set, regs);
+}
+
+asmlinkage void do_sigsuspend(struct pt_regs *regs)
+{
+	_sigpause_common(regs->u_regs[UREG_I0], regs);
+}
+
+asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, struct pt_regs *regs)
+{
+	sigset_t oldset, set;
+        
+	/* XXX: Don't preclude handling different sized sigset_t's.  */
+	if (sigsetsize != sizeof(sigset_t)) {
+		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
+		regs->u_regs[UREG_I0] = EINVAL;
+		return;
+	}
+	if (copy_from_user(&set, uset, sizeof(set))) {
+		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
+		regs->u_regs[UREG_I0] = EFAULT;
+		return;
+	}
+                                                                
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	oldset = current->blocked;
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+	
+	if (test_thread_flag(TIF_32BIT)) {
+		regs->tpc = (regs->tnpc & 0xffffffff);
+		regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
+	} else {
+		regs->tpc = regs->tnpc;
+		regs->tnpc += 4;
+	}
+
+	/* Condition codes and return value where set here for sigpause,
+	 * and so got used by setup_frame, which again causes sigreturn()
+	 * to return -EINTR.
+	 */
+	while (1) {
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		/*
+		 * Return -EINTR and set condition code here,
+		 * so the interrupted system call actually returns
+		 * these.
+		 */
+		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
+		regs->u_regs[UREG_I0] = EINTR;
+		if (do_signal(&oldset, regs, 0, 0))
+			return;
+	}
+}
+
+static inline int
+restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
+{
+	unsigned long *fpregs = current_thread_info()->fpregs;
+	unsigned long fprs;
+	int err;
+
+	err = __get_user(fprs, &fpu->si_fprs);
+	fprs_write(0);
+	regs->tstate &= ~TSTATE_PEF;
+	if (fprs & FPRS_DL)
+		err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
+		       	       (sizeof(unsigned int) * 32));
+	if (fprs & FPRS_DU)
+		err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
+		       	       (sizeof(unsigned int) * 32));
+	err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
+	err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
+	current_thread_info()->fpsaved[0] |= fprs;
+	return err;
+}
+
+void do_rt_sigreturn(struct pt_regs *regs)
+{
+	struct rt_signal_frame __user *sf;
+	unsigned long tpc, tnpc, tstate;
+	__siginfo_fpu_t __user *fpu_save;
+	mm_segment_t old_fs;
+	sigset_t set;
+	stack_t st;
+	int err;
+
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+	synchronize_user_stack ();
+	sf = (struct rt_signal_frame __user *)
+		(regs->u_regs [UREG_FP] + STACK_BIAS);
+
+	/* 1. Make sure we are not getting garbage from the user */
+	if (((unsigned long) sf) & 3)
+		goto segv;
+
+	err = get_user(tpc, &sf->regs.tpc);
+	err |= __get_user(tnpc, &sf->regs.tnpc);
+	if (test_thread_flag(TIF_32BIT)) {
+		tpc &= 0xffffffff;
+		tnpc &= 0xffffffff;
+	}
+	err |= ((tpc | tnpc) & 3);
+
+	/* 2. Restore the state */
+	err |= __get_user(regs->y, &sf->regs.y);
+	err |= __get_user(tstate, &sf->regs.tstate);
+	err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
+
+	/* User can only change condition codes and %asi in %tstate. */
+	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
+	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
+
+	err |= __get_user(fpu_save, &sf->fpu_save);
+	if (fpu_save)
+		err |= restore_fpu_state(regs, &sf->fpu_state);
+
+	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
+	err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
+	
+	if (err)
+		goto segv;
+		
+	regs->tpc = tpc;
+	regs->tnpc = tnpc;
+	
+	/* It is more difficult to avoid calling this function than to
+	   call it and ignore errors.  */
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
+	set_fs(old_fs);
+
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+	return;
+segv:
+	force_sig(SIGSEGV, current);
+}
+
+/* Checks if the fp is valid */
+static int invalid_frame_pointer(void __user *fp, int fplen)
+{
+	if (((unsigned long) fp) & 7)
+		return 1;
+	return 0;
+}
+
+static inline int
+save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
+{
+	unsigned long *fpregs = (unsigned long *)(regs+1);
+	unsigned long fprs;
+	int err = 0;
+	
+	fprs = current_thread_info()->fpsaved[0];
+	if (fprs & FPRS_DL)
+		err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
+				    (sizeof(unsigned int) * 32));
+	if (fprs & FPRS_DU)
+		err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
+				    (sizeof(unsigned int) * 32));
+	err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
+	err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
+	err |= __put_user(fprs, &fpu->si_fprs);
+
+	return err;
+}
+
+static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
+{
+	unsigned long sp;
+
+	sp = regs->u_regs[UREG_FP] + STACK_BIAS;
+
+	/* This is the X/Open sanctioned signal stack switching.  */
+	if (ka->sa.sa_flags & SA_ONSTACK) {
+		if (!on_sig_stack(sp) &&
+		    !((current->sas_ss_sp + current->sas_ss_size) & 7))
+			sp = current->sas_ss_sp + current->sas_ss_size;
+	}
+	return (void __user *)(sp - framesize);
+}
+
+static inline void
+setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
+	       int signo, sigset_t *oldset, siginfo_t *info)
+{
+	struct rt_signal_frame __user *sf;
+	int sigframe_size, err;
+
+	/* 1. Make sure everything is clean */
+	synchronize_user_stack();
+	save_and_clear_fpu();
+	
+	sigframe_size = RT_ALIGNEDSZ;
+	if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
+		sigframe_size -= sizeof(__siginfo_fpu_t);
+
+	sf = (struct rt_signal_frame __user *)
+		get_sigframe(ka, regs, sigframe_size);
+	
+	if (invalid_frame_pointer (sf, sigframe_size))
+		goto sigill;
+
+	if (get_thread_wsaved() != 0)
+		goto sigill;
+
+	/* 2. Save the current process state */
+	err = copy_to_user(&sf->regs, regs, sizeof (*regs));
+
+	if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
+		err |= save_fpu_state(regs, &sf->fpu_state);
+		err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
+	} else {
+		err |= __put_user(0, &sf->fpu_save);
+	}
+	
+	/* Setup sigaltstack */
+	err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
+	err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
+	err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
+
+	err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
+
+	err |= copy_in_user((u64 __user *)sf,
+			    (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
+			    sizeof(struct reg_window));
+
+	if (info)
+		err |= copy_siginfo_to_user(&sf->info, info);
+	else {
+		err |= __put_user(signo, &sf->info.si_signo);
+		err |= __put_user(SI_NOINFO, &sf->info.si_code);
+	}
+	if (err)
+		goto sigsegv;
+	
+	/* 3. signal handler back-trampoline and parameters */
+	regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
+	regs->u_regs[UREG_I0] = signo;
+	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
+
+	/* The sigcontext is passed in this way because of how it
+	 * is defined in GLIBC's /usr/include/bits/sigcontext.h
+	 * for sparc64.  It includes the 128 bytes of siginfo_t.
+	 */
+	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
+
+	/* 5. signal handler */
+	regs->tpc = (unsigned long) ka->sa.sa_handler;
+	regs->tnpc = (regs->tpc + 4);
+	if (test_thread_flag(TIF_32BIT)) {
+		regs->tpc &= 0xffffffff;
+		regs->tnpc &= 0xffffffff;
+	}
+	/* 4. return to kernel instructions */
+	regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
+	return;
+
+sigill:
+	do_exit(SIGILL);
+sigsegv:
+	force_sigsegv(signo, current);
+}
+
+static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
+				 siginfo_t *info,
+				 sigset_t *oldset, struct pt_regs *regs)
+{
+	setup_rt_frame(ka, regs, signr, oldset,
+		       (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
+	if (!(ka->sa.sa_flags & SA_NOMASK)) {
+		spin_lock_irq(&current->sighand->siglock);
+		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+		sigaddset(&current->blocked,signr);
+		recalc_sigpending();
+		spin_unlock_irq(&current->sighand->siglock);
+	}
+}
+
+static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
+				     struct sigaction *sa)
+{
+	switch (regs->u_regs[UREG_I0]) {
+	case ERESTART_RESTARTBLOCK:
+	case ERESTARTNOHAND:
+	no_system_call_restart:
+		regs->u_regs[UREG_I0] = EINTR;
+		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
+		break;
+	case ERESTARTSYS:
+		if (!(sa->sa_flags & SA_RESTART))
+			goto no_system_call_restart;
+		/* fallthrough */
+	case ERESTARTNOINTR:
+		regs->u_regs[UREG_I0] = orig_i0;
+		regs->tpc -= 4;
+		regs->tnpc -= 4;
+	}
+}
+
+/* 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.
+ */
+static int do_signal(sigset_t *oldset, struct pt_regs * regs,
+		     unsigned long orig_i0, int restart_syscall)
+{
+	siginfo_t info;
+	struct signal_deliver_cookie cookie;
+	struct k_sigaction ka;
+	int signr;
+	
+	cookie.restart_syscall = restart_syscall;
+	cookie.orig_i0 = orig_i0;
+
+	if (!oldset)
+		oldset = &current->blocked;
+
+#ifdef CONFIG_SPARC32_COMPAT
+	if (test_thread_flag(TIF_32BIT)) {
+		extern int do_signal32(sigset_t *, struct pt_regs *,
+				       unsigned long, int);
+		return do_signal32(oldset, regs, orig_i0,
+				   cookie.restart_syscall);
+	}
+#endif	
+
+	signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
+	if (signr > 0) {
+		if (cookie.restart_syscall)
+			syscall_restart(orig_i0, regs, &ka.sa);
+		handle_signal(signr, &ka, &info, oldset, regs);
+		return 1;
+	}
+	if (cookie.restart_syscall &&
+	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
+	     regs->u_regs[UREG_I0] == ERESTARTSYS ||
+	     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
+		/* replay the system call when we are done */
+		regs->u_regs[UREG_I0] = cookie.orig_i0;
+		regs->tpc -= 4;
+		regs->tnpc -= 4;
+	}
+	if (cookie.restart_syscall &&
+	    regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
+		regs->u_regs[UREG_G1] = __NR_restart_syscall;
+		regs->tpc -= 4;
+		regs->tnpc -= 4;
+	}
+	return 0;
+}
+
+void do_notify_resume(sigset_t *oldset, struct pt_regs *regs,
+		      unsigned long orig_i0, int restart_syscall,
+		      unsigned long thread_info_flags)
+{
+	if (thread_info_flags & _TIF_SIGPENDING)
+		do_signal(oldset, regs, orig_i0, restart_syscall);
+}
+
+void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
+{
+	struct signal_deliver_cookie *cp = cookie;
+
+	if (cp->restart_syscall &&
+	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
+	     regs->u_regs[UREG_I0] == ERESTARTSYS ||
+	     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
+		/* replay the system call when we are done */
+		regs->u_regs[UREG_I0] = cp->orig_i0;
+		regs->tpc -= 4;
+		regs->tnpc -= 4;
+		cp->restart_syscall = 0;
+	}
+	if (cp->restart_syscall &&
+	    regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
+		regs->u_regs[UREG_G1] = __NR_restart_syscall;
+		regs->tpc -= 4;
+		regs->tnpc -= 4;
+		cp->restart_syscall = 0;
+	}
+}