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, 1181 insertions, 0 deletions

diff --git a/arch/sparc/kernel/signal.c b/arch/sparc/kernel/signal.c
new file mode 100644
index 000000000000..011ff35057a5
--- /dev/null
+++ b/arch/sparc/kernel/signal.c
@@ -0,0 +1,1181 @@
+/*  $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem Exp $
+ *  linux/arch/sparc/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)
+ */
+
+#include <linux/config.h>
+#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.h>
+#include <linux/smp_lock.h>
+#include <linux/binfmts.h>	/* do_coredum */
+#include <linux/bitops.h>
+
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/svr4.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/cacheflush.h>	/* flush_sig_insns */
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
+		   void *fpqueue, unsigned long *fpqdepth);
+extern void fpload(unsigned long *fpregs, unsigned long *fsr);
+
+asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
+			 unsigned long orig_o0, int restart_syscall);
+
+/* Signal frames: the original one (compatible with SunOS):
+ *
+ * Set up a signal frame... Make the stack look the way SunOS
+ * expects it to look which is basically:
+ *
+ * ---------------------------------- <-- %sp at signal time
+ * Struct sigcontext
+ * Signal address
+ * Ptr to sigcontext area above
+ * Signal code
+ * The signal number itself
+ * One register window
+ * ---------------------------------- <-- New %sp
+ */
+struct signal_sframe {
+	struct reg_window	sig_window;
+	int			sig_num;
+	int			sig_code;
+	struct sigcontext __user *sig_scptr;
+	int			sig_address;
+	struct sigcontext	sig_context;
+	unsigned int		extramask[_NSIG_WORDS - 1];
+};
+
+/* 
+ * And the new one, intended to be used for Linux applications only
+ * (we have enough in there to work with clone).
+ * All the interesting bits are in the info field.
+ */
+
+struct new_signal_frame {
+	struct sparc_stackf	ss;
+	__siginfo_t		info;
+	__siginfo_fpu_t __user	*fpu_save;
+	unsigned long		insns[2] __attribute__ ((aligned (8)));
+	unsigned int		extramask[_NSIG_WORDS - 1];
+	unsigned int		extra_size; /* Should be 0 */
+	__siginfo_fpu_t		fpu_state;
+};
+
+struct rt_signal_frame {
+	struct sparc_stackf	ss;
+	siginfo_t		info;
+	struct pt_regs		regs;
+	sigset_t		mask;
+	__siginfo_fpu_t __user	*fpu_save;
+	unsigned int		insns[2];
+	stack_t			stack;
+	unsigned int		extra_size; /* Should be 0 */
+	__siginfo_fpu_t		fpu_state;
+};
+
+/* Align macros */
+#define SF_ALIGNEDSZ  (((sizeof(struct signal_sframe) + 7) & (~7)))
+#define NF_ALIGNEDSZ  (((sizeof(struct new_signal_frame) + 7) & (~7)))
+#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;
+
+	set &= _BLOCKABLE;
+	spin_lock_irq(&current->sighand->siglock);
+	saveset = current->blocked;
+	siginitset(&current->blocked, set);
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	regs->pc = regs->npc;
+	regs->npc += 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->psr |= PSR_C;
+		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->psr |= PSR_C;
+		regs->u_regs[UREG_I0] = EINVAL;
+		return;
+	}
+
+	if (copy_from_user(&set, uset, sizeof(set))) {
+		regs->psr |= PSR_C;
+		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);
+
+	regs->pc = regs->npc;
+	regs->npc += 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->psr |= PSR_C;
+		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)
+{
+	int err;
+#ifdef CONFIG_SMP
+	if (test_tsk_thread_flag(current, TIF_USEDFPU))
+		regs->psr &= ~PSR_EF;
+#else
+	if (current == last_task_used_math) {
+		last_task_used_math = NULL;
+		regs->psr &= ~PSR_EF;
+	}
+#endif
+	set_used_math();
+	clear_tsk_thread_flag(current, TIF_USEDFPU);
+
+	if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
+		return -EFAULT;
+
+	err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
+			       (sizeof(unsigned long) * 32));
+	err |= __get_user(current->thread.fsr, &fpu->si_fsr);
+	err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
+	if (current->thread.fpqdepth != 0)
+		err |= __copy_from_user(&current->thread.fpqueue[0],
+					&fpu->si_fpqueue[0],
+					((sizeof(unsigned long) +
+					(sizeof(unsigned long *)))*16));
+	return err;
+}
+
+static inline void do_new_sigreturn (struct pt_regs *regs)
+{
+	struct new_signal_frame __user *sf;
+	unsigned long up_psr, pc, npc;
+	sigset_t set;
+	__siginfo_fpu_t __user *fpu_save;
+	int err;
+
+	sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP];
+
+	/* 1. Make sure we are not getting garbage from the user */
+	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
+		goto segv_and_exit;
+
+	if (((unsigned long) sf) & 3)
+		goto segv_and_exit;
+
+	err = __get_user(pc,  &sf->info.si_regs.pc);
+	err |= __get_user(npc, &sf->info.si_regs.npc);
+
+	if ((pc | npc) & 3)
+		goto segv_and_exit;
+
+	/* 2. Restore the state */
+	up_psr = regs->psr;
+	err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
+
+	/* User can only change condition codes and FPU enabling in %psr. */
+	regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
+		  | (regs->psr & (PSR_ICC | PSR_EF));
+
+	err |= __get_user(fpu_save, &sf->fpu_save);
+
+	if (fpu_save)
+		err |= restore_fpu_state(regs, fpu_save);
+
+	/* This is pretty much atomic, no amount locking would prevent
+	 * the races which exist anyways.
+	 */
+	err |= __get_user(set.sig[0], &sf->info.si_mask);
+	err |= __copy_from_user(&set.sig[1], &sf->extramask,
+			        (_NSIG_WORDS-1) * sizeof(unsigned int));
+			   
+	if (err)
+		goto segv_and_exit;
+
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+	return;
+
+segv_and_exit:
+	force_sig(SIGSEGV, current);
+}
+
+asmlinkage void do_sigreturn(struct pt_regs *regs)
+{
+	struct sigcontext __user *scptr;
+	unsigned long pc, npc, psr;
+	sigset_t set;
+	int err;
+
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+	synchronize_user_stack();
+
+	if (current->thread.new_signal) {
+		do_new_sigreturn(regs);
+		return;
+	}
+
+	scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0];
+
+	/* Check sanity of the user arg. */
+	if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
+	    (((unsigned long) scptr) & 3))
+		goto segv_and_exit;
+
+	err = __get_user(pc, &scptr->sigc_pc);
+	err |= __get_user(npc, &scptr->sigc_npc);
+
+	if ((pc | npc) & 3)
+		goto segv_and_exit;
+
+	/* This is pretty much atomic, no amount locking would prevent
+	 * the races which exist anyways.
+	 */
+	err |= __get_user(set.sig[0], &scptr->sigc_mask);
+	/* Note that scptr + 1 points to extramask */
+	err |= __copy_from_user(&set.sig[1], scptr + 1,
+				(_NSIG_WORDS - 1) * sizeof(unsigned int));
+	
+	if (err)
+		goto segv_and_exit;
+
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	regs->pc = pc;
+	regs->npc = npc;
+
+	err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
+	err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
+	err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
+
+	/* User can only change condition codes in %psr. */
+	err |= __get_user(psr, &scptr->sigc_psr);
+	if (err)
+		goto segv_and_exit;
+		
+	regs->psr &= ~(PSR_ICC);
+	regs->psr |= (psr & PSR_ICC);
+	return;
+
+segv_and_exit:
+	force_sig(SIGSEGV, current);
+}
+
+asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
+{
+	struct rt_signal_frame __user *sf;
+	unsigned int psr, pc, npc;
+	__siginfo_fpu_t __user *fpu_save;
+	mm_segment_t old_fs;
+	sigset_t set;
+	stack_t st;
+	int err;
+
+	synchronize_user_stack();
+	sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
+	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
+	    (((unsigned long) sf) & 0x03))
+		goto segv;
+
+	err = __get_user(pc, &sf->regs.pc);
+	err |= __get_user(npc, &sf->regs.npc);
+	err |= ((pc | npc) & 0x03);
+
+	err |= __get_user(regs->y, &sf->regs.y);
+	err |= __get_user(psr, &sf->regs.psr);
+
+	err |= __copy_from_user(&regs->u_regs[UREG_G1],
+				&sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
+
+	regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
+
+	err |= __get_user(fpu_save, &sf->fpu_save);
+
+	if (fpu_save)
+		err |= restore_fpu_state(regs, fpu_save);
+	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->pc = pc;
+	regs->npc = npc;
+	
+	/* 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 inline int invalid_frame_pointer(void __user *fp, int fplen)
+{
+	if ((((unsigned long) fp) & 7) ||
+	    !__access_ok((unsigned long)fp, fplen) ||
+	    ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
+	     ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
+		return 1;
+	
+	return 0;
+}
+
+static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
+{
+	unsigned long sp;
+
+	sp = regs->u_regs[UREG_FP];
+
+	/* This is the X/Open sanctioned signal stack switching.  */
+	if (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_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
+{
+	struct signal_sframe __user *sframep;
+	struct sigcontext __user *sc;
+	int window = 0, err;
+	unsigned long pc = regs->pc;
+	unsigned long npc = regs->npc;
+	struct thread_info *tp = current_thread_info();
+	void __user *sig_address;
+	int sig_code;
+
+	synchronize_user_stack();
+	sframep = (struct signal_sframe __user *)
+		get_sigframe(sa, regs, SF_ALIGNEDSZ);
+	if (invalid_frame_pointer(sframep, sizeof(*sframep))){
+		/* Don't change signal code and address, so that
+		 * post mortem debuggers can have a look.
+		 */
+		goto sigill_and_return;
+	}
+
+	sc = &sframep->sig_context;
+
+	/* We've already made sure frame pointer isn't in kernel space... */
+	err  = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
+			 &sc->sigc_onstack);
+	err |= __put_user(oldset->sig[0], &sc->sigc_mask);
+	err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
+			      (_NSIG_WORDS - 1) * sizeof(unsigned int));
+	err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
+	err |= __put_user(pc, &sc->sigc_pc);
+	err |= __put_user(npc, &sc->sigc_npc);
+	err |= __put_user(regs->psr, &sc->sigc_psr);
+	err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
+	err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
+	err |= __put_user(tp->w_saved, &sc->sigc_oswins);
+	if (tp->w_saved)
+		for (window = 0; window < tp->w_saved; window++) {
+			put_user((char *)tp->rwbuf_stkptrs[window],
+				 &sc->sigc_spbuf[window]);
+			err |= __copy_to_user(&sc->sigc_wbuf[window],
+					      &tp->reg_window[window],
+					      sizeof(struct reg_window));
+		}
+	else
+		err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
+				      sizeof(struct reg_window));
+
+	tp->w_saved = 0; /* So process is allowed to execute. */
+
+	err |= __put_user(signr, &sframep->sig_num);
+	sig_address = NULL;
+	sig_code = 0;
+	if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
+		sig_address = info->si_addr;
+		switch (signr) {
+		case SIGSEGV:
+			switch (info->si_code) {
+			case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
+			default: sig_code = SUBSIG_PROTECTION; break;
+			}
+			break;
+		case SIGILL:
+			switch (info->si_code) {
+			case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
+			case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
+			case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
+			default: sig_code = SUBSIG_STACK; break;
+			}
+			break;
+		case SIGFPE:
+			switch (info->si_code) {
+			case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
+			case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
+			case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
+			case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
+			case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
+			case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
+			case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
+			default: sig_code = SUBSIG_FPERROR; break;
+			}
+			break;
+		case SIGBUS:
+			switch (info->si_code) {
+			case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
+			case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
+			default: sig_code = SUBSIG_BUSTIMEOUT; break;
+			}
+			break;
+		case SIGEMT:
+			switch (info->si_code) {
+			case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
+			}
+			break;
+		case SIGSYS:
+			if (info->si_code == (__SI_FAULT|0x100)) {
+				/* See sys_sunos.c */
+				sig_code = info->si_trapno;
+				break;
+			}
+		default:
+			sig_address = NULL;
+		}
+	}
+	err |= __put_user((unsigned long)sig_address, &sframep->sig_address);
+	err |= __put_user(sig_code, &sframep->sig_code);
+	err |= __put_user(sc, &sframep->sig_scptr);
+	if (err)
+		goto sigsegv;
+
+	regs->u_regs[UREG_FP] = (unsigned long) sframep;
+	regs->pc = (unsigned long) sa->sa_handler;
+	regs->npc = (regs->pc + 4);
+	return;
+
+sigill_and_return:
+	do_exit(SIGILL);
+sigsegv:
+	force_sigsegv(signr, current);
+}
+
+
+static inline int
+save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
+{
+	int err = 0;
+#ifdef CONFIG_SMP
+	if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
+		put_psr(get_psr() | PSR_EF);
+		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
+		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
+		regs->psr &= ~(PSR_EF);
+		clear_tsk_thread_flag(current, TIF_USEDFPU);
+	}
+#else
+	if (current == last_task_used_math) {
+		put_psr(get_psr() | PSR_EF);
+		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
+		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
+		last_task_used_math = NULL;
+		regs->psr &= ~(PSR_EF);
+	}
+#endif
+	err |= __copy_to_user(&fpu->si_float_regs[0],
+			      &current->thread.float_regs[0],
+			      (sizeof(unsigned long) * 32));
+	err |= __put_user(current->thread.fsr, &fpu->si_fsr);
+	err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
+	if (current->thread.fpqdepth != 0)
+		err |= __copy_to_user(&fpu->si_fpqueue[0],
+				      &current->thread.fpqueue[0],
+				      ((sizeof(unsigned long) +
+				      (sizeof(unsigned long *)))*16));
+	clear_used_math();
+	return err;
+}
+
+static inline void
+new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
+		int signo, sigset_t *oldset)
+{
+	struct new_signal_frame __user *sf;
+	int sigframe_size, err;
+
+	/* 1. Make sure everything is clean */
+	synchronize_user_stack();
+
+	sigframe_size = NF_ALIGNEDSZ;
+	if (!used_math())
+		sigframe_size -= sizeof(__siginfo_fpu_t);
+
+	sf = (struct new_signal_frame __user *)
+		get_sigframe(&ka->sa, regs, sigframe_size);
+
+	if (invalid_frame_pointer(sf, sigframe_size))
+		goto sigill_and_return;
+
+	if (current_thread_info()->w_saved != 0)
+		goto sigill_and_return;
+
+	/* 2. Save the current process state */
+	err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
+	
+	err |= __put_user(0, &sf->extra_size);
+
+	if (used_math()) {
+		err |= save_fpu_state(regs, &sf->fpu_state);
+		err |= __put_user(&sf->fpu_state, &sf->fpu_save);
+	} else {
+		err |= __put_user(0, &sf->fpu_save);
+	}
+
+	err |= __put_user(oldset->sig[0], &sf->info.si_mask);
+	err |= __copy_to_user(sf->extramask, &oldset->sig[1],
+			      (_NSIG_WORDS - 1) * sizeof(unsigned int));
+	err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
+			      sizeof(struct reg_window));
+	if (err)
+		goto sigsegv;
+	
+	/* 3. signal handler back-trampoline and parameters */
+	regs->u_regs[UREG_FP] = (unsigned long) sf;
+	regs->u_regs[UREG_I0] = signo;
+	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
+	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
+
+	/* 4. signal handler */
+	regs->pc = (unsigned long) ka->sa.sa_handler;
+	regs->npc = (regs->pc + 4);
+
+	/* 5. return to kernel instructions */
+	if (ka->ka_restorer)
+		regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
+	else {
+		regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
+
+		/* mov __NR_sigreturn, %g1 */
+		err |= __put_user(0x821020d8, &sf->insns[0]);
+
+		/* t 0x10 */
+		err |= __put_user(0x91d02010, &sf->insns[1]);
+		if (err)
+			goto sigsegv;
+
+		/* Flush instruction space. */
+		flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
+	}
+	return;
+
+sigill_and_return:
+	do_exit(SIGILL);
+sigsegv:
+	force_sigsegv(signo, current);
+}
+
+static inline void
+new_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;
+	unsigned int psr;
+	int err;
+
+	synchronize_user_stack();
+	sigframe_size = RT_ALIGNEDSZ;
+	if (!used_math())
+		sigframe_size -= sizeof(__siginfo_fpu_t);
+	sf = (struct rt_signal_frame __user *)
+		get_sigframe(&ka->sa, regs, sigframe_size);
+	if (invalid_frame_pointer(sf, sigframe_size))
+		goto sigill;
+	if (current_thread_info()->w_saved != 0)
+		goto sigill;
+
+	err  = __put_user(regs->pc, &sf->regs.pc);
+	err |= __put_user(regs->npc, &sf->regs.npc);
+	err |= __put_user(regs->y, &sf->regs.y);
+	psr = regs->psr;
+	if (used_math())
+		psr |= PSR_EF;
+	err |= __put_user(psr, &sf->regs.psr);
+	err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
+	err |= __put_user(0, &sf->extra_size);
+
+	if (psr & PSR_EF) {
+		err |= save_fpu_state(regs, &sf->fpu_state);
+		err |= __put_user(&sf->fpu_state, &sf->fpu_save);
+	} else {
+		err |= __put_user(0, &sf->fpu_save);
+	}
+	err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
+	
+	/* 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, (char *) regs->u_regs[UREG_FP],
+			      sizeof(struct reg_window));	
+
+	err |= copy_siginfo_to_user(&sf->info, info);
+
+	if (err)
+		goto sigsegv;
+
+	regs->u_regs[UREG_FP] = (unsigned long) sf;
+	regs->u_regs[UREG_I0] = signo;
+	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
+	regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
+
+	regs->pc = (unsigned long) ka->sa.sa_handler;
+	regs->npc = (regs->pc + 4);
+
+	if (ka->ka_restorer)
+		regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
+	else {
+		regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
+
+		/* mov __NR_sigreturn, %g1 */
+		err |= __put_user(0x821020d8, &sf->insns[0]);
+
+		/* t 0x10 */
+		err |= __put_user(0x91d02010, &sf->insns[1]);
+		if (err)
+			goto sigsegv;
+
+		/* Flush instruction space. */
+		flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
+	}
+	return;
+
+sigill:
+	do_exit(SIGILL);
+sigsegv:
+	force_sigsegv(signo, current);
+}
+
+/* Setup a Solaris stack frame */
+static inline void
+setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
+		 struct pt_regs *regs, int signr, sigset_t *oldset)
+{
+	svr4_signal_frame_t __user *sfp;
+	svr4_gregset_t  __user *gr;
+	svr4_siginfo_t  __user *si;
+	svr4_mcontext_t __user *mc;
+	svr4_gwindows_t __user *gw;
+	svr4_ucontext_t __user *uc;
+	svr4_sigset_t	setv;
+	struct thread_info *tp = current_thread_info();
+	int window = 0, err;
+
+	synchronize_user_stack();
+	sfp = (svr4_signal_frame_t __user *)
+		get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window));
+
+	if (invalid_frame_pointer(sfp, sizeof(*sfp)))
+		goto sigill_and_return;
+
+	/* Start with a clean frame pointer and fill it */
+	err = __clear_user(sfp, sizeof(*sfp));
+
+	/* Setup convenience variables */
+	si = &sfp->si;
+	uc = &sfp->uc;
+	gw = &sfp->gw;
+	mc = &uc->mcontext;
+	gr = &mc->greg;
+	
+	/* FIXME: where am I supposed to put this?
+	 * sc->sigc_onstack = old_status;
+	 * anyways, it does not look like it is used for anything at all.
+	 */
+	setv.sigbits[0] = oldset->sig[0];
+	setv.sigbits[1] = oldset->sig[1];
+	if (_NSIG_WORDS >= 4) {
+		setv.sigbits[2] = oldset->sig[2];
+		setv.sigbits[3] = oldset->sig[3];
+		err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
+	} else
+		err |= __copy_to_user(&uc->sigmask, &setv,
+				      2 * sizeof(unsigned int));
+
+	/* Store registers */
+	err |= __put_user(regs->pc, &((*gr)[SVR4_PC]));
+	err |= __put_user(regs->npc, &((*gr)[SVR4_NPC]));
+	err |= __put_user(regs->psr, &((*gr)[SVR4_PSR]));
+	err |= __put_user(regs->y, &((*gr)[SVR4_Y]));
+	
+	/* Copy g[1..7] and o[0..7] registers */
+	err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
+			      sizeof(long) * 7);
+	err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
+			      sizeof(long) * 8);
+
+	/* Setup sigaltstack */
+	err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
+	err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
+	err |= __put_user(current->sas_ss_size, &uc->stack.size);
+
+	/* Save the currently window file: */
+
+	/* 1. Link sfp->uc->gwins to our windows */
+	err |= __put_user(gw, &mc->gwin);
+	    
+	/* 2. Number of windows to restore at setcontext(): */
+	err |= __put_user(tp->w_saved, &gw->count);
+
+	/* 3. Save each valid window
+	 *    Currently, it makes a copy of the windows from the kernel copy.
+	 *    David's code for SunOS, makes the copy but keeps the pointer to
+	 *    the kernel.  My version makes the pointer point to a userland 
+	 *    copy of those.  Mhm, I wonder if I shouldn't just ignore those
+	 *    on setcontext and use those that are on the kernel, the signal
+	 *    handler should not be modyfing those, mhm.
+	 *
+	 *    These windows are just used in case synchronize_user_stack failed
+	 *    to flush the user windows.
+	 */
+	for (window = 0; window < tp->w_saved; window++) {
+		err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]);
+		err |= __copy_to_user(&gw->win[window],
+				      &tp->reg_window[window],
+				      sizeof(svr4_rwindow_t));
+		err |= __put_user(0, gw->winptr[window]);
+	}
+
+	/* 4. We just pay attention to the gw->count field on setcontext */
+	tp->w_saved = 0; /* So process is allowed to execute. */
+
+	/* Setup the signal information.  Solaris expects a bunch of
+	 * information to be passed to the signal handler, we don't provide
+	 * that much currently, should use siginfo.
+	 */
+	err |= __put_user(signr, &si->siginfo.signo);
+	err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
+	if (err)
+		goto sigsegv;
+
+	regs->u_regs[UREG_FP] = (unsigned long) sfp;
+	regs->pc = (unsigned long) sa->sa_handler;
+	regs->npc = (regs->pc + 4);
+
+	/* Arguments passed to signal handler */
+	if (regs->u_regs[14]){
+		struct reg_window __user *rw = (struct reg_window __user *)
+			regs->u_regs[14];
+
+		err |= __put_user(signr, &rw->ins[0]);
+		err |= __put_user(si, &rw->ins[1]);
+		err |= __put_user(uc, &rw->ins[2]);
+		err |= __put_user(sfp, &rw->ins[6]);	/* frame pointer */
+		if (err)
+			goto sigsegv;
+
+		regs->u_regs[UREG_I0] = signr;
+		regs->u_regs[UREG_I1] = (unsigned long) si;
+		regs->u_regs[UREG_I2] = (unsigned long) uc;
+	}
+	return;
+
+sigill_and_return:
+	do_exit(SIGILL);
+sigsegv:
+	force_sigsegv(signr, current);
+}
+
+asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
+{
+	svr4_gregset_t  __user *gr;
+	svr4_mcontext_t __user *mc;
+	svr4_sigset_t	setv;
+	int err = 0;
+
+	synchronize_user_stack();
+
+	if (current_thread_info()->w_saved)
+		return -EFAULT;
+
+	err = clear_user(uc, sizeof(*uc));
+	if (err)
+		return -EFAULT;
+
+	/* Setup convenience variables */
+	mc = &uc->mcontext;
+	gr = &mc->greg;
+
+	setv.sigbits[0] = current->blocked.sig[0];
+	setv.sigbits[1] = current->blocked.sig[1];
+	if (_NSIG_WORDS >= 4) {
+		setv.sigbits[2] = current->blocked.sig[2];
+		setv.sigbits[3] = current->blocked.sig[3];
+		err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
+	} else
+		err |= __copy_to_user(&uc->sigmask, &setv,
+				      2 * sizeof(unsigned int));
+
+	/* Store registers */
+	err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]);
+	err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]);
+	err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]);
+	err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]);
+	
+	/* Copy g[1..7] and o[0..7] registers */
+	err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
+			      sizeof(uint) * 7);
+	err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
+			      sizeof(uint) * 8);
+
+	/* Setup sigaltstack */
+	err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
+	err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
+	err |= __put_user(current->sas_ss_size, &uc->stack.size);
+
+	/* The register file is not saved
+	 * we have already stuffed all of it with sync_user_stack
+	 */
+	return (err ? -EFAULT : 0);
+}
+
+/* Set the context for a svr4 application, this is Solaris way to sigreturn */
+asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
+{
+	svr4_gregset_t  __user *gr;
+	unsigned long pc, npc, psr;
+	mm_segment_t old_fs;
+	sigset_t set;
+	svr4_sigset_t setv;
+	int err;
+	stack_t st;
+	
+	/* Fixme: restore windows, or is this already taken care of in
+	 * svr4_setup_frame when sync_user_windows is done?
+	 */
+	flush_user_windows();
+
+	if (current_thread_info()->w_saved)
+		goto sigsegv_and_return;
+
+	if (((unsigned long) c) & 3)
+		goto sigsegv_and_return;
+
+	if (!__access_ok((unsigned long)c, sizeof(*c)))
+		goto sigsegv_and_return;
+
+	/* Check for valid PC and nPC */
+	gr = &c->mcontext.greg;
+	err = __get_user(pc, &((*gr)[SVR4_PC]));
+	err |= __get_user(npc, &((*gr)[SVR4_NPC]));
+
+	if ((pc | npc) & 3)
+		goto sigsegv_and_return;
+
+	/* Retrieve information from passed ucontext */
+	/* note that nPC is ored a 1, this is used to inform entry.S */
+	/* that we don't want it to mess with our PC and nPC */
+
+	/* This is pretty much atomic, no amount locking would prevent
+	 * the races which exist anyways.
+	 */
+	err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
+	
+	err |= __get_user(st.ss_sp, &c->stack.sp);
+	err |= __get_user(st.ss_flags, &c->stack.flags);
+	err |= __get_user(st.ss_size, &c->stack.size);
+	
+	if (err)
+		goto sigsegv_and_return;
+		
+	/* 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,
+		       regs->u_regs[UREG_I6]);
+	set_fs(old_fs);
+	
+	set.sig[0] = setv.sigbits[0];
+	set.sig[1] = setv.sigbits[1];
+	if (_NSIG_WORDS >= 4) {
+		set.sig[2] = setv.sigbits[2];
+		set.sig[3] = setv.sigbits[3];
+	}
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+	regs->pc = pc;
+	regs->npc = npc | 1;
+	err |= __get_user(regs->y, &((*gr)[SVR4_Y]));
+	err |= __get_user(psr, &((*gr)[SVR4_PSR]));
+	regs->psr &= ~(PSR_ICC);
+	regs->psr |= (psr & PSR_ICC);
+
+	/* Restore g[1..7] and o[0..7] registers */
+	err |= __copy_from_user(&regs->u_regs[UREG_G1], &(*gr)[SVR4_G1],
+			      sizeof(long) * 7);
+	err |= __copy_from_user(&regs->u_regs[UREG_I0], &(*gr)[SVR4_O0],
+			      sizeof(long) * 8);
+	return (err ? -EFAULT : 0);
+
+sigsegv_and_return:
+	force_sig(SIGSEGV, current);
+	return -EFAULT;
+}
+
+static inline void
+handle_signal(unsigned long signr, struct k_sigaction *ka,
+	      siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
+	      int svr4_signal)
+{
+	if (svr4_signal)
+		setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
+	else {
+		if (ka->sa.sa_flags & SA_SIGINFO)
+			new_setup_rt_frame(ka, regs, signr, oldset, info);
+		else if (current->thread.new_signal)
+			new_setup_frame(ka, regs, signr, oldset);
+		else
+			setup_frame(&ka->sa, regs, signr, oldset, info);
+	}
+	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->psr |= PSR_C;
+		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->pc -= 4;
+		regs->npc -= 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.
+ */
+asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
+			 unsigned long orig_i0, int restart_syscall)
+{
+	siginfo_t info;
+	struct sparc_deliver_cookie cookie;
+	struct k_sigaction ka;
+	int signr;
+
+	/*
+	 * XXX Disable svr4 signal handling until solaris emulation works.
+	 * It is buggy - Anton
+	 */
+#define SVR4_SIGNAL_BROKEN 1
+#ifdef SVR4_SIGNAL_BROKEN
+	int svr4_signal = 0;
+#else
+	int svr4_signal = current->personality == PER_SVR4;
+#endif
+
+	cookie.restart_syscall = restart_syscall;
+	cookie.orig_i0 = orig_i0;
+
+	if (!oldset)
+		oldset = &current->blocked;
+
+	signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
+	if (signr > 0) {
+		if (cookie.restart_syscall)
+			syscall_restart(cookie.orig_i0, regs, &ka.sa);
+		handle_signal(signr, &ka, &info, oldset,
+			      regs, svr4_signal);
+		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->pc -= 4;
+		regs->npc -= 4;
+	}
+	if (cookie.restart_syscall &&
+	    regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
+		regs->u_regs[UREG_G1] = __NR_restart_syscall;
+		regs->pc -= 4;
+		regs->npc -= 4;
+	}
+	return 0;
+}
+
+asmlinkage int
+do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
+		unsigned long sp)
+{
+	int ret = -EFAULT;
+
+	/* First see if old state is wanted. */
+	if (ossptr) {
+		if (put_user(current->sas_ss_sp + current->sas_ss_size,
+			     &ossptr->the_stack) ||
+		    __put_user(on_sig_stack(sp), &ossptr->cur_status))
+			goto out;
+	}
+
+	/* Now see if we want to update the new state. */
+	if (ssptr) {
+		char *ss_sp;
+
+		if (get_user(ss_sp, &ssptr->the_stack))
+			goto out;
+		/* If the current stack was set with sigaltstack, don't
+		   swap stacks while we are on it.  */
+		ret = -EPERM;
+		if (current->sas_ss_sp && on_sig_stack(sp))
+			goto out;
+
+		/* Since we don't know the extent of the stack, and we don't
+		   track onstack-ness, but rather calculate it, we must
+		   presume a size.  Ho hum this interface is lossy.  */
+		current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
+		current->sas_ss_size = SIGSTKSZ;
+	}
+	ret = 0;
+out:
+	return ret;
+}
+
+void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
+{
+	struct sparc_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->pc -= 4;
+		regs->npc -= 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->pc -= 4;
+		regs->npc -= 4;
+		cp->restart_syscall = 0;
+	}
+}