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, 905 insertions, 0 deletions

diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
new file mode 100644
index 00000000000..1f3b19124c0
--- /dev/null
+++ b/arch/mips/kernel/signal32.c
@@ -0,0 +1,905 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1991, 1992  Linus Torvalds
+ * Copyright (C) 1994 - 2000  Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#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/syscalls.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/compat.h>
+#include <linux/suspend.h>
+#include <linux/compiler.h>
+
+#include <asm/asm.h>
+#include <linux/bitops.h>
+#include <asm/cacheflush.h>
+#include <asm/sim.h>
+#include <asm/uaccess.h>
+#include <asm/ucontext.h>
+#include <asm/system.h>
+#include <asm/fpu.h>
+
+#define SI_PAD_SIZE32   ((SI_MAX_SIZE/sizeof(int)) - 3)
+
+typedef struct compat_siginfo {
+	int si_signo;
+	int si_code;
+	int si_errno;
+
+	union {
+		int _pad[SI_PAD_SIZE32];
+
+		/* kill() */
+		struct {
+			compat_pid_t _pid;	/* sender's pid */
+			compat_uid_t _uid;	/* sender's uid */
+		} _kill;
+
+		/* SIGCHLD */
+		struct {
+			compat_pid_t _pid;	/* which child */
+			compat_uid_t _uid;	/* sender's uid */
+			int _status;		/* exit code */
+			compat_clock_t _utime;
+			compat_clock_t _stime;
+		} _sigchld;
+
+		/* IRIX SIGCHLD */
+		struct {
+			compat_pid_t _pid;	/* which child */
+			compat_clock_t _utime;
+			int _status;		/* exit code */
+			compat_clock_t _stime;
+		} _irix_sigchld;
+
+		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
+		struct {
+			s32 _addr; /* faulting insn/memory ref. */
+		} _sigfault;
+
+		/* SIGPOLL, SIGXFSZ (To do ...)  */
+		struct {
+			int _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
+			int _fd;
+		} _sigpoll;
+
+		/* POSIX.1b timers */
+		struct {
+			unsigned int _timer1;
+			unsigned int _timer2;
+		} _timer;
+
+		/* POSIX.1b signals */
+		struct {
+			compat_pid_t _pid;	/* sender's pid */
+			compat_uid_t _uid;	/* sender's uid */
+			compat_sigval_t _sigval;
+		} _rt;
+
+	} _sifields;
+} compat_siginfo_t;
+
+/*
+ * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
+ */
+#define __NR_O32_sigreturn		4119
+#define __NR_O32_rt_sigreturn		4193
+#define __NR_O32_restart_syscall	4253
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
+
+/* 32-bit compatibility types */
+
+#define _NSIG_BPW32	32
+#define _NSIG_WORDS32	(_NSIG / _NSIG_BPW32)
+
+typedef struct {
+	unsigned int sig[_NSIG_WORDS32];
+} sigset_t32;
+
+typedef unsigned int __sighandler32_t;
+typedef void (*vfptr_t)(void);
+
+struct sigaction32 {
+	unsigned int		sa_flags;
+	__sighandler32_t	sa_handler;
+	compat_sigset_t		sa_mask;
+};
+
+/* IRIX compatible stack_t  */
+typedef struct sigaltstack32 {
+	s32 ss_sp;
+	compat_size_t ss_size;
+	int ss_flags;
+} stack32_t;
+
+struct ucontext32 {
+	u32                 uc_flags;
+	s32                 uc_link;
+	stack32_t           uc_stack;
+	struct sigcontext32 uc_mcontext;
+	sigset_t32          uc_sigmask;   /* mask last for extensibility */
+};
+
+extern void __put_sigset_unknown_nsig(void);
+extern void __get_sigset_unknown_nsig(void);
+
+static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t *ubuf)
+{
+	int err = 0;
+
+	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
+		return -EFAULT;
+
+	switch (_NSIG_WORDS) {
+	default:
+		__put_sigset_unknown_nsig();
+	case 2:
+		err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]);
+		err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
+	case 1:
+		err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]);
+		err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
+	}
+
+	return err;
+}
+
+static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t *ubuf)
+{
+	int err = 0;
+	unsigned long sig[4];
+
+	if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
+		return -EFAULT;
+
+	switch (_NSIG_WORDS) {
+	default:
+		__get_sigset_unknown_nsig();
+	case 2:
+		err |= __get_user (sig[3], &ubuf->sig[3]);
+		err |= __get_user (sig[2], &ubuf->sig[2]);
+		kbuf->sig[1] = sig[2] | (sig[3] << 32);
+	case 1:
+		err |= __get_user (sig[1], &ubuf->sig[1]);
+		err |= __get_user (sig[0], &ubuf->sig[0]);
+		kbuf->sig[0] = sig[0] | (sig[1] << 32);
+	}
+
+	return err;
+}
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+
+save_static_function(sys32_sigsuspend);
+__attribute_used__ noinline static int
+_sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)
+{
+	compat_sigset_t *uset;
+	sigset_t newset, saveset;
+
+	uset = (compat_sigset_t *) regs.regs[4];
+	if (get_sigset(&newset, uset))
+		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.regs[2] = EINTR;
+	regs.regs[7] = 1;
+	while (1) {
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		if (do_signal32(&saveset, &regs))
+			return -EINTR;
+	}
+}
+
+save_static_function(sys32_rt_sigsuspend);
+__attribute_used__ noinline static int
+_sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
+{
+	compat_sigset_t *uset;
+	sigset_t newset, saveset;
+        size_t sigsetsize;
+
+	/* XXX Don't preclude handling different sized sigset_t's.  */
+	sigsetsize = regs.regs[5];
+	if (sigsetsize != sizeof(compat_sigset_t))
+		return -EINVAL;
+
+	uset = (compat_sigset_t *) regs.regs[4];
+	if (get_sigset(&newset, uset))
+		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.regs[2] = EINTR;
+	regs.regs[7] = 1;
+	while (1) {
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		if (do_signal32(&saveset, &regs))
+			return -EINTR;
+	}
+}
+
+asmlinkage int sys32_sigaction(int sig, const struct sigaction32 *act,
+                               struct sigaction32 *oact)
+{
+	struct k_sigaction new_ka, old_ka;
+	int ret;
+	int err = 0;
+
+	if (act) {
+		old_sigset_t mask;
+
+		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
+			return -EFAULT;
+		err |= __get_user((u32)(u64)new_ka.sa.sa_handler,
+		                  &act->sa_handler);
+		err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
+		err |= __get_user(mask, &act->sa_mask.sig[0]);
+		if (err)
+			return -EFAULT;
+
+		siginitset(&new_ka.sa.sa_mask, mask);
+	}
+
+	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+	if (!ret && oact) {
+		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
+                        return -EFAULT;
+		err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+		err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
+		                  &oact->sa_handler);
+		err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
+                err |= __put_user(0, &oact->sa_mask.sig[1]);
+                err |= __put_user(0, &oact->sa_mask.sig[2]);
+                err |= __put_user(0, &oact->sa_mask.sig[3]);
+                if (err)
+			return -EFAULT;
+	}
+
+	return ret;
+}
+
+asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs)
+{
+	const stack32_t *uss = (const stack32_t *) regs.regs[4];
+	stack32_t *uoss = (stack32_t *) regs.regs[5];
+	unsigned long usp = regs.regs[29];
+	stack_t kss, koss;
+	int ret, err = 0;
+	mm_segment_t old_fs = get_fs();
+	s32 sp;
+
+	if (uss) {
+		if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
+			return -EFAULT;
+		err |= __get_user(sp, &uss->ss_sp);
+		kss.ss_sp = (void *) (long) sp;
+		err |= __get_user(kss.ss_size, &uss->ss_size);
+		err |= __get_user(kss.ss_flags, &uss->ss_flags);
+		if (err)
+			return -EFAULT;
+	}
+
+	set_fs (KERNEL_DS);
+	ret = do_sigaltstack(uss ? &kss : NULL , uoss ? &koss : NULL, usp);
+	set_fs (old_fs);
+
+	if (!ret && uoss) {
+		if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
+			return -EFAULT;
+		sp = (int) (long) koss.ss_sp;
+		err |= __put_user(sp, &uoss->ss_sp);
+		err |= __put_user(koss.ss_size, &uoss->ss_size);
+		err |= __put_user(koss.ss_flags, &uoss->ss_flags);
+		if (err)
+			return -EFAULT;
+	}
+	return ret;
+}
+
+static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc)
+{
+	int err = 0;
+	__u32 used_math;
+
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+	err |= __get_user(regs->cp0_epc, &sc->sc_pc);
+	err |= __get_user(regs->hi, &sc->sc_mdhi);
+	err |= __get_user(regs->lo, &sc->sc_mdlo);
+
+#define restore_gp_reg(i) do {						\
+	err |= __get_user(regs->regs[i], &sc->sc_regs[i]);		\
+} while(0)
+	restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
+	restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
+	restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
+	restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
+	restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
+	restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
+	restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
+	restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
+	restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
+	restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
+	restore_gp_reg(31);
+#undef restore_gp_reg
+
+	err |= __get_user(used_math, &sc->sc_used_math);
+	conditional_used_math(used_math);
+
+	preempt_disable();
+
+	if (used_math()) {
+		/* restore fpu context if we have used it before */
+		own_fpu();
+		err |= restore_fp_context32(sc);
+	} else {
+		/* signal handler may have used FPU.  Give it up. */
+		lose_fpu();
+	}
+
+	preempt_enable();
+
+	return err;
+}
+
+struct sigframe {
+	u32 sf_ass[4];			/* argument save space for o32 */
+	u32 sf_code[2];			/* signal trampoline */
+	struct sigcontext32 sf_sc;
+	sigset_t sf_mask;
+};
+
+struct rt_sigframe32 {
+	u32 rs_ass[4];			/* argument save space for o32 */
+	u32 rs_code[2];			/* signal trampoline */
+	compat_siginfo_t rs_info;
+	struct ucontext32 rs_uc;
+};
+
+int copy_siginfo_to_user32(compat_siginfo_t *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_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((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;
+}
+
+save_static_function(sys32_sigreturn);
+__attribute_used__ noinline static void
+_sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
+{
+	struct sigframe *frame;
+	sigset_t blocked;
+
+	frame = (struct sigframe *) regs.regs[29];
+	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+		goto badframe;
+	if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
+		goto badframe;
+
+	sigdelsetmask(&blocked, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = blocked;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	if (restore_sigcontext32(&regs, &frame->sf_sc))
+		goto badframe;
+
+	/*
+	 * Don't let your children do this ...
+	 */
+	if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
+		do_syscall_trace(&regs, 1);
+	__asm__ __volatile__(
+		"move\t$29, %0\n\t"
+		"j\tsyscall_exit"
+		:/* no outputs */
+		:"r" (&regs));
+	/* Unreached */
+
+badframe:
+	force_sig(SIGSEGV, current);
+}
+
+save_static_function(sys32_rt_sigreturn);
+__attribute_used__ noinline static void
+_sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
+{
+	struct rt_sigframe32 *frame;
+	sigset_t set;
+	stack_t st;
+	s32 sp;
+
+	frame = (struct rt_sigframe32 *) regs.regs[29];
+	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+		goto badframe;
+	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
+		goto badframe;
+
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	if (restore_sigcontext32(&regs, &frame->rs_uc.uc_mcontext))
+		goto badframe;
+
+	/* The ucontext contains a stack32_t, so we must convert!  */
+	if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
+		goto badframe;
+	st.ss_size = (long) sp;
+	if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
+		goto badframe;
+	if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
+		goto badframe;
+
+	/* It is more difficult to avoid calling this function than to
+	   call it and ignore errors.  */
+	do_sigaltstack(&st, NULL, regs.regs[29]);
+
+	/*
+	 * Don't let your children do this ...
+	 */
+	__asm__ __volatile__(
+		"move\t$29, %0\n\t"
+		"j\tsyscall_exit"
+		:/* no outputs */
+		:"r" (&regs));
+	/* Unreached */
+
+badframe:
+	force_sig(SIGSEGV, current);
+}
+
+static inline int setup_sigcontext32(struct pt_regs *regs,
+				     struct sigcontext32 *sc)
+{
+	int err = 0;
+
+	err |= __put_user(regs->cp0_epc, &sc->sc_pc);
+	err |= __put_user(regs->cp0_status, &sc->sc_status);
+
+#define save_gp_reg(i) {						\
+	err |= __put_user(regs->regs[i], &sc->sc_regs[i]);		\
+} while(0)
+	__put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
+	save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
+	save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
+	save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
+	save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
+	save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
+	save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
+	save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
+	save_gp_reg(31);
+#undef save_gp_reg
+
+	err |= __put_user(regs->hi, &sc->sc_mdhi);
+	err |= __put_user(regs->lo, &sc->sc_mdlo);
+	err |= __put_user(regs->cp0_cause, &sc->sc_cause);
+	err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
+
+	err |= __put_user(!!used_math(), &sc->sc_used_math);
+
+	if (!used_math())
+		goto out;
+
+	/* 
+	 * Save FPU state to signal context.  Signal handler will "inherit"
+	 * current FPU state.
+	 */
+	preempt_disable();
+
+	if (!is_fpu_owner()) {
+		own_fpu();
+		restore_fp(current);
+	}
+	err |= save_fp_context32(sc);
+
+	preempt_enable();
+
+out:
+	return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
+				 size_t frame_size)
+{
+	unsigned long sp;
+
+	/* Default to using normal stack */
+	sp = regs->regs[29];
+
+	/*
+ 	 * FPU emulator may have it's own trampoline active just
+ 	 * above the user stack, 16-bytes before the next lowest
+ 	 * 16 byte boundary.  Try to avoid trashing it.
+ 	 */
+ 	sp -= 32;
+
+	/* This is the X/Open sanctioned signal stack switching.  */
+	if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
+		sp = current->sas_ss_sp + current->sas_ss_size;
+
+	return (void *)((sp - frame_size) & ALMASK);
+}
+
+static inline void setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+			       int signr, sigset_t *set)
+{
+	struct sigframe *frame;
+	int err = 0;
+
+	frame = get_sigframe(ka, regs, sizeof(*frame));
+	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
+		goto give_sigsegv;
+
+	/*
+	 * Set up the return code ...
+	 *
+	 *         li      v0, __NR_O32_sigreturn
+	 *         syscall
+	 */
+	err |= __put_user(0x24020000 + __NR_O32_sigreturn, frame->sf_code + 0);
+	err |= __put_user(0x0000000c                     , frame->sf_code + 1);
+	flush_cache_sigtramp((unsigned long) frame->sf_code);
+
+	err |= setup_sigcontext32(regs, &frame->sf_sc);
+	err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
+	if (err)
+		goto give_sigsegv;
+
+	/*
+	 * Arguments to signal handler:
+	 *
+	 *   a0 = signal number
+	 *   a1 = 0 (should be cause)
+	 *   a2 = pointer to struct sigcontext
+	 *
+	 * $25 and c0_epc point to the signal handler, $29 points to the
+	 * struct sigframe.
+	 */
+	regs->regs[ 4] = signr;
+	regs->regs[ 5] = 0;
+	regs->regs[ 6] = (unsigned long) &frame->sf_sc;
+	regs->regs[29] = (unsigned long) frame;
+	regs->regs[31] = (unsigned long) frame->sf_code;
+	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
+
+#if DEBUG_SIG
+	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
+	       current->comm, current->pid,
+	       frame, regs->cp0_epc, frame->sf_code);
+#endif
+        return;
+
+give_sigsegv:
+	force_sigsegv(signr, current);
+}
+
+static inline void setup_rt_frame(struct k_sigaction * ka,
+				  struct pt_regs *regs, int signr,
+				  sigset_t *set, siginfo_t *info)
+{
+	struct rt_sigframe32 *frame;
+	int err = 0;
+	s32 sp;
+
+	frame = get_sigframe(ka, regs, sizeof(*frame));
+	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
+		goto give_sigsegv;
+
+	/* Set up to return from userspace.  If provided, use a stub already
+	   in userspace.  */
+	/*
+	 * Set up the return code ...
+	 *
+	 *         li      v0, __NR_O32_rt_sigreturn
+	 *         syscall
+	 */
+	err |= __put_user(0x24020000 + __NR_O32_rt_sigreturn, frame->rs_code + 0);
+	err |= __put_user(0x0000000c                      , frame->rs_code + 1);
+	flush_cache_sigtramp((unsigned long) frame->rs_code);
+
+	/* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
+	err |= copy_siginfo_to_user32(&frame->rs_info, info);
+
+	/* Create the ucontext.  */
+	err |= __put_user(0, &frame->rs_uc.uc_flags);
+	err |= __put_user(0, &frame->rs_uc.uc_link);
+	sp = (int) (long) current->sas_ss_sp;
+	err |= __put_user(sp,
+	                  &frame->rs_uc.uc_stack.ss_sp);
+	err |= __put_user(sas_ss_flags(regs->regs[29]),
+	                  &frame->rs_uc.uc_stack.ss_flags);
+	err |= __put_user(current->sas_ss_size,
+	                  &frame->rs_uc.uc_stack.ss_size);
+	err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
+	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
+
+	if (err)
+		goto give_sigsegv;
+
+	/*
+	 * Arguments to signal handler:
+	 *
+	 *   a0 = signal number
+	 *   a1 = 0 (should be cause)
+	 *   a2 = pointer to ucontext
+	 *
+	 * $25 and c0_epc point to the signal handler, $29 points to
+	 * the struct rt_sigframe32.
+	 */
+	regs->regs[ 4] = signr;
+	regs->regs[ 5] = (unsigned long) &frame->rs_info;
+	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
+	regs->regs[29] = (unsigned long) frame;
+	regs->regs[31] = (unsigned long) frame->rs_code;
+	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
+
+#if DEBUG_SIG
+	printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
+	       current->comm, current->pid,
+	       frame, regs->cp0_epc, frame->rs_code);
+#endif
+	return;
+
+give_sigsegv:
+	force_sigsegv(signr, current);
+}
+
+static inline void handle_signal(unsigned long sig, siginfo_t *info,
+	struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
+{
+	switch (regs->regs[0]) {
+	case ERESTART_RESTARTBLOCK:
+	case ERESTARTNOHAND:
+		regs->regs[2] = EINTR;
+		break;
+	case ERESTARTSYS:
+		if(!(ka->sa.sa_flags & SA_RESTART)) {
+			regs->regs[2] = EINTR;
+			break;
+		}
+	/* fallthrough */
+	case ERESTARTNOINTR:		/* Userland will reload $v0.  */
+		regs->regs[7] = regs->regs[26];
+		regs->cp0_epc -= 8;
+	}
+
+	regs->regs[0] = 0;		/* Don't deal with this again.  */
+
+	if (ka->sa.sa_flags & SA_SIGINFO)
+		setup_rt_frame(ka, regs, sig, oldset, info);
+	else
+		setup_frame(ka, regs, sig, oldset);
+
+	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);
+	}
+}
+
+int do_signal32(sigset_t *oldset, struct pt_regs *regs)
+{
+	struct k_sigaction ka;
+	siginfo_t info;
+	int signr;
+
+	/*
+	 * We want the common case to go fast, which is why we may in certain
+	 * cases get here from kernel mode. Just return without doing anything
+	 * if so.
+	 */
+	if (!user_mode(regs))
+		return 1;
+
+	if (try_to_freeze(0))
+		goto no_signal;
+
+	if (!oldset)
+		oldset = &current->blocked;
+
+	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+	if (signr > 0) {
+		handle_signal(signr, &info, &ka, oldset, regs);
+		return 1;
+	}
+
+no_signal:
+	/*
+	 * Who's code doesn't conform to the restartable syscall convention
+	 * dies here!!!  The li instruction, a single machine instruction,
+	 * must directly be followed by the syscall instruction.
+	 */
+	if (regs->regs[0]) {
+		if (regs->regs[2] == ERESTARTNOHAND ||
+		    regs->regs[2] == ERESTARTSYS ||
+		    regs->regs[2] == ERESTARTNOINTR) {
+			regs->regs[7] = regs->regs[26];
+			regs->cp0_epc -= 8;
+		}
+		if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
+			regs->regs[2] = __NR_O32_restart_syscall;
+			regs->regs[7] = regs->regs[26];
+			regs->cp0_epc -= 4;
+		}
+	}
+	return 0;
+}
+
+asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 *act,
+				  struct sigaction32 *oact,
+				  unsigned int sigsetsize)
+{
+	struct k_sigaction new_sa, old_sa;
+	int ret = -EINVAL;
+
+	/* XXX: Don't preclude handling different sized sigset_t's.  */
+	if (sigsetsize != sizeof(sigset_t))
+		goto out;
+
+	if (act) {
+		int err = 0;
+
+		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
+			return -EFAULT;
+		err |= __get_user((u32)(u64)new_sa.sa.sa_handler,
+		                  &act->sa_handler);
+		err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags);
+		err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask);
+		if (err)
+			return -EFAULT;
+	}
+
+	ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
+
+	if (!ret && oact) {
+		int err = 0;
+
+		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
+			return -EFAULT;
+
+		err |= __put_user((u32)(u64)old_sa.sa.sa_handler,
+		                   &oact->sa_handler);
+		err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags);
+		err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask);
+		if (err)
+			return -EFAULT;
+	}
+out:
+	return ret;
+}
+
+asmlinkage int sys32_rt_sigprocmask(int how, compat_sigset_t *set,
+	compat_sigset_t *oset, unsigned int sigsetsize)
+{
+	sigset_t old_set, new_set;
+	int ret;
+	mm_segment_t old_fs = get_fs();
+
+	if (set && get_sigset(&new_set, set))
+		return -EFAULT;
+
+	set_fs (KERNEL_DS);
+	ret = sys_rt_sigprocmask(how, set ? &new_set : NULL,
+				 oset ? &old_set : NULL, sigsetsize);
+	set_fs (old_fs);
+
+	if (!ret && oset && put_sigset(&old_set, oset))
+		return -EFAULT;
+
+	return ret;
+}
+
+asmlinkage int sys32_rt_sigpending(compat_sigset_t *uset,
+	unsigned int sigsetsize)
+{
+	int ret;
+	sigset_t set;
+	mm_segment_t old_fs = get_fs();
+
+	set_fs (KERNEL_DS);
+	ret = sys_rt_sigpending(&set, sigsetsize);
+	set_fs (old_fs);
+
+	if (!ret && put_sigset(&set, uset))
+		return -EFAULT;
+
+	return ret;
+}
+
+asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t *uinfo)
+{
+	siginfo_t info;
+	int ret;
+	mm_segment_t old_fs = get_fs();
+
+	if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
+	    copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE))
+		return -EFAULT;
+	set_fs (KERNEL_DS);
+	ret = sys_rt_sigqueueinfo(pid, sig, &info);
+	set_fs (old_fs);
+	return ret;
+}