Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

Conflicts:

	arch/x86/kernel/io_apic.c

1 files changed, 899 insertions, 0 deletions

diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c
new file mode 100644
index 00000000000..ba5b09ad666
--- /dev/null
+++ b/arch/sparc/kernel/signal32.c
@@ -0,0 +1,899 @@
+/*  arch/sparc64/kernel/signal32.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/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/binfmts.h>
+#include <linux/compat.h>
+#include <linux/bitops.h>
+#include <linux/tracehook.h>
+
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/pgtable.h>
+#include <asm/psrcompat.h>
+#include <asm/fpumacro.h>
+#include <asm/visasm.h>
+#include <asm/compat_signal.h>
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+/* This magic should be in g_upper[0] for all upper parts
+ * to be valid.
+ */
+#define SIGINFO_EXTRA_V8PLUS_MAGIC	0x130e269
+typedef struct {
+	unsigned int g_upper[8];
+	unsigned int o_upper[8];
+	unsigned int asi;
+} siginfo_extra_v8plus_t;
+
+struct signal_frame32 {
+	struct sparc_stackf32	ss;
+	__siginfo32_t		info;
+	/* __siginfo_fpu32_t * */ u32 fpu_save;
+	unsigned int		insns[2];
+	unsigned int		extramask[_COMPAT_NSIG_WORDS - 1];
+	unsigned int		extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
+	/* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
+	siginfo_extra_v8plus_t	v8plus;
+	__siginfo_fpu_t		fpu_state;
+};
+
+typedef struct compat_siginfo{
+	int si_signo;
+	int si_errno;
+	int si_code;
+
+	union {
+		int _pad[SI_PAD_SIZE32];
+
+		/* kill() */
+		struct {
+			compat_pid_t _pid;		/* sender's pid */
+			unsigned int _uid;		/* sender's uid */
+		} _kill;
+
+		/* POSIX.1b timers */
+		struct {
+			compat_timer_t _tid;			/* timer id */
+			int _overrun;			/* overrun count */
+			compat_sigval_t _sigval;		/* same as below */
+			int _sys_private;		/* not to be passed to user */
+		} _timer;
+
+		/* POSIX.1b signals */
+		struct {
+			compat_pid_t _pid;		/* sender's pid */
+			unsigned int _uid;		/* sender's uid */
+			compat_sigval_t _sigval;
+		} _rt;
+
+		/* SIGCHLD */
+		struct {
+			compat_pid_t _pid;		/* which child */
+			unsigned int _uid;		/* sender's uid */
+			int _status;			/* exit code */
+			compat_clock_t _utime;
+			compat_clock_t _stime;
+		} _sigchld;
+
+		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */
+		struct {
+			u32 _addr; /* faulting insn/memory ref. */
+			int _trapno;
+		} _sigfault;
+
+		/* SIGPOLL */
+		struct {
+			int _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
+			int _fd;
+		} _sigpoll;
+	} _sifields;
+}compat_siginfo_t;
+
+struct rt_signal_frame32 {
+	struct sparc_stackf32	ss;
+	compat_siginfo_t	info;
+	struct pt_regs32	regs;
+	compat_sigset_t		mask;
+	/* __siginfo_fpu32_t * */ u32 fpu_save;
+	unsigned int		insns[2];
+	stack_t32		stack;
+	unsigned int		extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
+	/* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
+	siginfo_extra_v8plus_t	v8plus;
+	__siginfo_fpu_t		fpu_state;
+};
+
+/* Align macros */
+#define SF_ALIGNEDSZ  (((sizeof(struct signal_frame32) + 7) & (~7)))
+#define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame32) + 7) & (~7)))
+
+int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
+{
+	int err;
+
+	if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
+		return -EFAULT;
+
+	/* 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.
+	   This routine must convert siginfo from 64bit to 32bit as well
+	   at the same time.  */
+	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);
+	if (from->si_code < 0)
+		err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
+	else {
+		switch (from->si_code >> 16) {
+		case __SI_TIMER >> 16:
+			err |= __put_user(from->si_tid, &to->si_tid);
+			err |= __put_user(from->si_overrun, &to->si_overrun);
+			err |= __put_user(from->si_int, &to->si_int);
+			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_pid, &to->si_pid);
+			err |= __put_user(from->si_uid, &to->si_uid);
+			break;
+		case __SI_FAULT >> 16:
+			err |= __put_user(from->si_trapno, &to->si_trapno);
+			err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
+			break;
+		case __SI_POLL >> 16:
+			err |= __put_user(from->si_band, &to->si_band);
+			err |= __put_user(from->si_fd, &to->si_fd);
+			break;
+		case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
+		case __SI_MESGQ >> 16:
+			err |= __put_user(from->si_pid, &to->si_pid);
+			err |= __put_user(from->si_uid, &to->si_uid);
+			err |= __put_user(from->si_int, &to->si_int);
+			break;
+		}
+	}
+	return err;
+}
+
+/* CAUTION: This is just a very minimalist implementation for the
+ *          sake of compat_sys_rt_sigqueueinfo()
+ */
+int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
+{
+	if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
+		return -EFAULT;
+
+	if (copy_from_user(to, from, 3*sizeof(int)) ||
+	    copy_from_user(to->_sifields._pad, from->_sifields._pad,
+			   SI_PAD_SIZE))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int restore_fpu_state32(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_sigreturn32(struct pt_regs *regs)
+{
+	struct signal_frame32 __user *sf;
+	unsigned int psr;
+	unsigned pc, npc, fpu_save;
+	sigset_t set;
+	unsigned seta[_COMPAT_NSIG_WORDS];
+	int err, i;
+	
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+	synchronize_user_stack();
+
+	regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
+	sf = (struct signal_frame32 __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)) ||
+	    (((unsigned long) sf) & 3))
+		goto segv;
+
+	get_user(pc, &sf->info.si_regs.pc);
+	__get_user(npc, &sf->info.si_regs.npc);
+
+	if ((pc | npc) & 3)
+		goto segv;
+
+	if (test_thread_flag(TIF_32BIT)) {
+		pc &= 0xffffffff;
+		npc &= 0xffffffff;
+	}
+	regs->tpc = pc;
+	regs->tnpc = npc;
+
+	/* 2. Restore the state */
+	err = __get_user(regs->y, &sf->info.si_regs.y);
+	err |= __get_user(psr, &sf->info.si_regs.psr);
+
+	for (i = UREG_G1; i <= UREG_I7; i++)
+		err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
+	if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
+		err |= __get_user(i, &sf->v8plus.g_upper[0]);
+		if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
+			unsigned long asi;
+
+			for (i = UREG_G1; i <= UREG_I7; i++)
+				err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
+			err |= __get_user(asi, &sf->v8plus.asi);
+			regs->tstate &= ~TSTATE_ASI;
+			regs->tstate |= ((asi & 0xffUL) << 24UL);
+		}
+	}
+
+	/* User can only change condition codes in %tstate. */
+	regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
+	regs->tstate |= psr_to_tstate_icc(psr);
+
+	/* Prevent syscall restart.  */
+	pt_regs_clear_syscall(regs);
+
+	err |= __get_user(fpu_save, &sf->fpu_save);
+	if (fpu_save)
+		err |= restore_fpu_state32(regs, &sf->fpu_state);
+	err |= __get_user(seta[0], &sf->info.si_mask);
+	err |= copy_from_user(seta+1, &sf->extramask,
+			      (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
+	if (err)
+	    	goto segv;
+	switch (_NSIG_WORDS) {
+		case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
+		case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
+		case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
+		case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
+	}
+	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);
+}
+
+asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
+{
+	struct rt_signal_frame32 __user *sf;
+	unsigned int psr, pc, npc, fpu_save, u_ss_sp;
+	mm_segment_t old_fs;
+	sigset_t set;
+	compat_sigset_t seta;
+	stack_t st;
+	int err, i;
+	
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+	synchronize_user_stack();
+	regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
+	sf = (struct rt_signal_frame32 __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)) ||
+	    (((unsigned long) sf) & 3))
+		goto segv;
+
+	get_user(pc, &sf->regs.pc);
+	__get_user(npc, &sf->regs.npc);
+
+	if ((pc | npc) & 3)
+		goto segv;
+
+	if (test_thread_flag(TIF_32BIT)) {
+		pc &= 0xffffffff;
+		npc &= 0xffffffff;
+	}
+	regs->tpc = pc;
+	regs->tnpc = npc;
+
+	/* 2. Restore the state */
+	err = __get_user(regs->y, &sf->regs.y);
+	err |= __get_user(psr, &sf->regs.psr);
+	
+	for (i = UREG_G1; i <= UREG_I7; i++)
+		err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
+	if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
+		err |= __get_user(i, &sf->v8plus.g_upper[0]);
+		if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
+			unsigned long asi;
+
+			for (i = UREG_G1; i <= UREG_I7; i++)
+				err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
+			err |= __get_user(asi, &sf->v8plus.asi);
+			regs->tstate &= ~TSTATE_ASI;
+			regs->tstate |= ((asi & 0xffUL) << 24UL);
+		}
+	}
+
+	/* User can only change condition codes in %tstate. */
+	regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
+	regs->tstate |= psr_to_tstate_icc(psr);
+
+	/* Prevent syscall restart.  */
+	pt_regs_clear_syscall(regs);
+
+	err |= __get_user(fpu_save, &sf->fpu_save);
+	if (fpu_save)
+		err |= restore_fpu_state32(regs, &sf->fpu_state);
+	err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
+	err |= __get_user(u_ss_sp, &sf->stack.ss_sp);
+	st.ss_sp = compat_ptr(u_ss_sp);
+	err |= __get_user(st.ss_flags, &sf->stack.ss_flags);
+	err |= __get_user(st.ss_size, &sf->stack.ss_size);
+	if (err)
+		goto segv;
+		
+	/* 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((stack_t __user *) &st, NULL, (unsigned long)sf);
+	set_fs(old_fs);
+	
+	switch (_NSIG_WORDS) {
+		case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32);
+		case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32);
+		case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32);
+		case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
+	}
+	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) || ((unsigned long)fp) > 0x100000000ULL - fplen)
+		return 1;
+	return 0;
+}
+
+static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
+{
+	unsigned long sp;
+	
+	regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
+	sp = regs->u_regs[UREG_FP];
+	
+	/*
+	 * If we are on the alternate signal stack and would overflow it, don't.
+	 * Return an always-bogus address instead so we will die with SIGSEGV.
+	 */
+	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
+		return (void __user *) -1L;
+
+	/* This is the X/Open sanctioned signal stack switching.  */
+	if (sa->sa_flags & SA_ONSTACK) {
+		if (sas_ss_flags(sp) == 0)
+			sp = current->sas_ss_sp + current->sas_ss_size;
+	}
+
+	/* Always align the stack frame.  This handles two cases.  First,
+	 * sigaltstack need not be mindful of platform specific stack
+	 * alignment.  Second, if we took this signal because the stack
+	 * is not aligned properly, we'd like to take the signal cleanly
+	 * and report that.
+	 */
+	sp &= ~7UL;
+
+	return (void __user *)(sp - framesize);
+}
+
+static int save_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
+{
+	unsigned long *fpregs = current_thread_info()->fpregs;
+	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 void setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
+			  int signo, sigset_t *oldset)
+{
+	struct signal_frame32 __user *sf;
+	int sigframe_size;
+	u32 psr;
+	int i, err;
+	unsigned int seta[_COMPAT_NSIG_WORDS];
+
+	/* 1. Make sure everything is clean */
+	synchronize_user_stack();
+	save_and_clear_fpu();
+	
+	sigframe_size = SF_ALIGNEDSZ;
+	if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
+		sigframe_size -= sizeof(__siginfo_fpu_t);
+
+	sf = (struct signal_frame32 __user *)
+		get_sigframe(&ka->sa, 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 */
+	if (test_thread_flag(TIF_32BIT)) {
+		regs->tpc &= 0xffffffff;
+		regs->tnpc &= 0xffffffff;
+	}
+	err  = put_user(regs->tpc, &sf->info.si_regs.pc);
+	err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
+	err |= __put_user(regs->y, &sf->info.si_regs.y);
+	psr = tstate_to_psr(regs->tstate);
+	if (current_thread_info()->fpsaved[0] & FPRS_FEF)
+		psr |= PSR_EF;
+	err |= __put_user(psr, &sf->info.si_regs.psr);
+	for (i = 0; i < 16; i++)
+		err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
+	err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
+	err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
+	for (i = 1; i < 16; i++)
+		err |= __put_user(((u32 *)regs->u_regs)[2*i],
+				  &sf->v8plus.g_upper[i]);
+	err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
+			  &sf->v8plus.asi);
+
+	if (psr & PSR_EF) {
+		err |= save_fpu_state32(regs, &sf->fpu_state);
+		err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
+	} else {
+		err |= __put_user(0, &sf->fpu_save);
+	}
+
+	switch (_NSIG_WORDS) {
+	case 4: seta[7] = (oldset->sig[3] >> 32);
+	        seta[6] = oldset->sig[3];
+	case 3: seta[5] = (oldset->sig[2] >> 32);
+	        seta[4] = oldset->sig[2];
+	case 2: seta[3] = (oldset->sig[1] >> 32);
+	        seta[2] = oldset->sig[1];
+	case 1: seta[1] = (oldset->sig[0] >> 32);
+	        seta[0] = oldset->sig[0];
+	}
+	err |= __put_user(seta[0], &sf->info.si_mask);
+	err |= __copy_to_user(sf->extramask, seta + 1,
+			      (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
+
+	err |= copy_in_user((u32 __user *)sf,
+			    (u32 __user *)(regs->u_regs[UREG_FP]),
+			    sizeof(struct reg_window32));
+	
+	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->tpc = (unsigned long) ka->sa.sa_handler;
+	regs->tnpc = (regs->tpc + 4);
+	if (test_thread_flag(TIF_32BIT)) {
+		regs->tpc &= 0xffffffff;
+		regs->tnpc &= 0xffffffff;
+	}
+
+	/* 5. return to kernel instructions */
+	if (ka->ka_restorer) {
+		regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
+	} else {
+		/* Flush instruction space. */
+		unsigned long address = ((unsigned long)&(sf->insns[0]));
+		pgd_t *pgdp = pgd_offset(current->mm, address);
+		pud_t *pudp = pud_offset(pgdp, address);
+		pmd_t *pmdp = pmd_offset(pudp, address);
+		pte_t *ptep;
+		pte_t pte;
+
+		regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
+	
+		err  = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
+		err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
+		if (err)
+			goto sigsegv;
+
+		preempt_disable();
+		ptep = pte_offset_map(pmdp, address);
+		pte = *ptep;
+		if (pte_present(pte)) {
+			unsigned long page = (unsigned long)
+				page_address(pte_page(pte));
+
+			wmb();
+			__asm__ __volatile__("flush	%0 + %1"
+					     : /* no outputs */
+					     : "r" (page),
+					       "r" (address & (PAGE_SIZE - 1))
+					     : "memory");
+		}
+		pte_unmap(ptep);
+		preempt_enable();
+	}
+	return;
+
+sigill:
+	do_exit(SIGILL);
+sigsegv:
+	force_sigsegv(signo, current);
+}
+
+static void setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
+			     unsigned long signr, sigset_t *oldset,
+			     siginfo_t *info)
+{
+	struct rt_signal_frame32 __user *sf;
+	int sigframe_size;
+	u32 psr;
+	int i, err;
+	compat_sigset_t seta;
+
+	/* 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_frame32 __user *)
+		get_sigframe(&ka->sa, 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 */
+	if (test_thread_flag(TIF_32BIT)) {
+		regs->tpc &= 0xffffffff;
+		regs->tnpc &= 0xffffffff;
+	}
+	err  = put_user(regs->tpc, &sf->regs.pc);
+	err |= __put_user(regs->tnpc, &sf->regs.npc);
+	err |= __put_user(regs->y, &sf->regs.y);
+	psr = tstate_to_psr(regs->tstate);
+	if (current_thread_info()->fpsaved[0] & FPRS_FEF)
+		psr |= PSR_EF;
+	err |= __put_user(psr, &sf->regs.psr);
+	for (i = 0; i < 16; i++)
+		err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
+	err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
+	err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
+	for (i = 1; i < 16; i++)
+		err |= __put_user(((u32 *)regs->u_regs)[2*i],
+				  &sf->v8plus.g_upper[i]);
+	err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
+			  &sf->v8plus.asi);
+
+	if (psr & PSR_EF) {
+		err |= save_fpu_state32(regs, &sf->fpu_state);
+		err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
+	} else {
+		err |= __put_user(0, &sf->fpu_save);
+	}
+
+	/* Update the siginfo structure.  */
+	err |= copy_siginfo_to_user32(&sf->info, info);
+	
+	/* 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);
+
+	switch (_NSIG_WORDS) {
+	case 4: seta.sig[7] = (oldset->sig[3] >> 32);
+		seta.sig[6] = oldset->sig[3];
+	case 3: seta.sig[5] = (oldset->sig[2] >> 32);
+		seta.sig[4] = oldset->sig[2];
+	case 2: seta.sig[3] = (oldset->sig[1] >> 32);
+		seta.sig[2] = oldset->sig[1];
+	case 1: seta.sig[1] = (oldset->sig[0] >> 32);
+		seta.sig[0] = oldset->sig[0];
+	}
+	err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
+
+	err |= copy_in_user((u32 __user *)sf,
+			    (u32 __user *)(regs->u_regs[UREG_FP]),
+			    sizeof(struct reg_window32));
+	if (err)
+		goto sigsegv;
+	
+	/* 3. signal handler back-trampoline and parameters */
+	regs->u_regs[UREG_FP] = (unsigned long) sf;
+	regs->u_regs[UREG_I0] = signr;
+	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
+	regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
+
+	/* 4. 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;
+	}
+
+	/* 5. return to kernel instructions */
+	if (ka->ka_restorer)
+		regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
+	else {
+		/* Flush instruction space. */
+		unsigned long address = ((unsigned long)&(sf->insns[0]));
+		pgd_t *pgdp = pgd_offset(current->mm, address);
+		pud_t *pudp = pud_offset(pgdp, address);
+		pmd_t *pmdp = pmd_offset(pudp, address);
+		pte_t *ptep;
+
+		regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
+	
+		/* mov __NR_rt_sigreturn, %g1 */
+		err |= __put_user(0x82102065, &sf->insns[0]);
+
+		/* t 0x10 */
+		err |= __put_user(0x91d02010, &sf->insns[1]);
+		if (err)
+			goto sigsegv;
+
+		preempt_disable();
+		ptep = pte_offset_map(pmdp, address);
+		if (pte_present(*ptep)) {
+			unsigned long page = (unsigned long)
+				page_address(pte_page(*ptep));
+
+			wmb();
+			__asm__ __volatile__("flush	%0 + %1"
+					     : /* no outputs */
+					     : "r" (page),
+					       "r" (address & (PAGE_SIZE - 1))
+					     : "memory");
+		}
+		pte_unmap(ptep);
+		preempt_enable();
+	}
+	return;
+
+sigill:
+	do_exit(SIGILL);
+sigsegv:
+	force_sigsegv(signr, current);
+}
+
+static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka,
+				   siginfo_t *info,
+				   sigset_t *oldset, struct pt_regs *regs)
+{
+	if (ka->sa.sa_flags & SA_SIGINFO)
+		setup_rt_frame32(ka, regs, signr, oldset, info);
+	else
+		setup_frame32(ka, regs, signr, oldset);
+
+	spin_lock_irq(&current->sighand->siglock);
+	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+	if (!(ka->sa.sa_flags & SA_NOMASK))
+		sigaddset(&current->blocked,signr);
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+}
+
+static inline void syscall_restart32(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;
+		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.
+ */
+void do_signal32(sigset_t *oldset, struct pt_regs * regs,
+		 int restart_syscall, unsigned long orig_i0)
+{
+	struct k_sigaction ka;
+	siginfo_t info;
+	int signr;
+	
+	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+
+	/* If the debugger messes with the program counter, it clears
+	 * the "in syscall" bit, directing us to not perform a syscall
+	 * restart.
+	 */
+	if (restart_syscall && !pt_regs_is_syscall(regs))
+		restart_syscall = 0;
+
+	if (signr > 0) {
+		if (restart_syscall)
+			syscall_restart32(orig_i0, regs, &ka.sa);
+		handle_signal32(signr, &ka, &info, oldset, regs);
+
+		/* A signal was successfully delivered; the saved
+		 * sigmask will have been stored in the signal frame,
+		 * and will be restored by sigreturn, so we can simply
+		 * clear the TS_RESTORE_SIGMASK flag.
+		 */
+		current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
+
+		tracehook_signal_handler(signr, &info, &ka, regs, 0);
+		return;
+	}
+	if (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] = orig_i0;
+		regs->tpc -= 4;
+		regs->tnpc -= 4;
+	}
+	if (restart_syscall &&
+	    regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
+		regs->u_regs[UREG_G1] = __NR_restart_syscall;
+		regs->tpc -= 4;
+		regs->tnpc -= 4;
+	}
+
+	/* If there's no signal to deliver, we just put the saved sigmask
+	 * back
+	 */
+	if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
+		current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
+		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+	}
+}
+
+struct sigstack32 {
+	u32 the_stack;
+	int cur_status;
+};
+
+asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
+{
+	struct sigstack32 __user *ssptr =
+		(struct sigstack32 __user *)((unsigned long)(u_ssptr));
+	struct sigstack32 __user *ossptr =
+		(struct sigstack32 __user *)((unsigned long)(u_ossptr));
+	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) {
+		u32 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;
+}
+
+asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp)
+{
+	stack_t uss, uoss;
+	u32 u_ss_sp = 0;
+	int ret;
+	mm_segment_t old_fs;
+	stack_t32 __user *uss32 = compat_ptr(ussa);
+	stack_t32 __user *uoss32 = compat_ptr(uossa);
+	
+	if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) ||
+		    __get_user(uss.ss_flags, &uss32->ss_flags) ||
+		    __get_user(uss.ss_size, &uss32->ss_size)))
+		return -EFAULT;
+	uss.ss_sp = compat_ptr(u_ss_sp);
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL,
+			     uossa ? (stack_t __user *) &uoss : NULL, sp);
+	set_fs(old_fs);
+	if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) ||
+		    __put_user(uoss.ss_flags, &uoss32->ss_flags) ||
+		    __put_user(uoss.ss_size, &uoss32->ss_size)))
+		return -EFAULT;
+	return ret;
+}