Import of Linux/MIPS 2.1.14.2

1 files changed, 826 insertions, 0 deletions

diff --git a/arch/mips/kernel/irixsig.c b/arch/mips/kernel/irixsig.c
new file mode 100644
index 000000000..94f8004f6
--- /dev/null
+++ b/arch/mips/kernel/irixsig.c
@@ -0,0 +1,826 @@
+/* $Id: irixsig.c,v 1.5 1996/08/05 09:20:56 dm Exp $
+ * irixsig.c: WHEEE, IRIX signals!  YOW, am I compatable or what?!?!
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+
+#undef DEBUG_SIG
+
+#define _S(nr) (1<<((nr)-1))
+
+#define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
+
+struct sigctx_irix5 {
+	u32 rmask, cp0_status;
+	u64 pc;
+	u64 regs[32];
+	u64 fpregs[32];
+	u32 usedfp, fpcsr, fpeir, sstk_flags;
+	u64 hi, lo;
+	u64 cp0_cause, cp0_badvaddr, _unused0;
+	u32 sigset[4];
+	u64 weird_fpu_thing;
+	u64 _unused1[31];
+};
+
+#ifdef DEBUG_SIG
+/* Debugging */
+static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
+{
+	int i;
+
+	printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
+	       (unsigned long) c->rmask,
+	       (unsigned long) c->cp0_status,
+	       (unsigned long) c->pc);
+	printk("regs: ");
+	for(i = 0; i < 16; i++)
+		printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
+	printk("\nregs: ");
+	for(i = 16; i < 32; i++)
+		printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
+	printk("\nfpregs: ");
+	for(i = 0; i < 16; i++)
+		printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
+	printk("\nfpregs: ");
+	for(i = 16; i < 32; i++)
+		printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
+	printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
+	       (int) c->usedfp, (unsigned long) c->fpcsr,
+	       (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
+	printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
+	       (unsigned long) c->hi, (unsigned long) c->lo,
+	       (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
+	printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
+	       "sigset<3>[%08lx]\n", (unsigned long) c->sigset[0],
+	       (unsigned long) c->sigset[1], (unsigned long) c->sigset[2],
+	       (unsigned long) c->sigset[3]);
+}
+#endif
+
+static void setup_irix_frame(struct sigaction * sa, struct pt_regs *regs,
+			     int signr, unsigned long oldmask)
+{
+	unsigned long sp;
+	struct sigctx_irix5 *ctx;
+	int i;
+
+	sp = regs->regs[29];
+	sp -= sizeof(struct sigctx_irix5);
+	sp &= ~(0xf);
+	ctx = (struct sigctx_irix5 *) sp;
+	if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
+		do_exit(SIGSEGV);
+
+	__put_user(0, &ctx->weird_fpu_thing);
+	__put_user(~(0x00000001), &ctx->rmask);
+	__put_user(0, &ctx->regs[0]);
+	for(i = 1; i < 32; i++)
+		__put_user((u64) regs->regs[i], &ctx->regs[i]);
+
+	__put_user((u64) regs->hi, &ctx->hi);
+	__put_user((u64) regs->lo, &ctx->lo);
+	__put_user((u64) regs->cp0_epc, &ctx->pc);
+	__put_user(current->used_math, &ctx->usedfp);
+	__put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
+	__put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
+
+	__put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
+
+	__put_user(0, &ctx->sigset[1]);
+	__put_user(0, &ctx->sigset[2]);
+	__put_user(0, &ctx->sigset[3]);
+	__put_user(oldmask, &ctx->sigset[0]);
+
+#ifdef DEBUG_SIG
+	dump_irix5_sigctx(ctx);
+#endif
+
+	regs->regs[5] = 0; /* XXX sigcode XXX */
+	regs->regs[4] = (unsigned long) signr;
+	regs->regs[6] = regs->regs[29] = sp;
+	regs->regs[7] = (unsigned long) sa->sa_handler;
+	regs->regs[25] = regs->cp0_epc = current->tss.irix_trampoline;
+}
+
+extern asmlinkage int sys_waitpid(pid_t pid,unsigned long * stat_addr, int options);
+
+asmlinkage int do_irix_signal(unsigned long oldmask, struct pt_regs * regs)
+{
+	unsigned long mask = ~current->blocked;
+	unsigned long handler_signal = 0;
+	unsigned long signr;
+	struct sigaction * sa;
+
+#ifdef DEBUG_SIG
+	printk("[%s:%d] Delivering IRIX signal oldmask=%08lx\n",
+	       current->comm, current->pid, oldmask);
+#endif
+	while ((signr = current->signal & mask)) {
+		signr = ffz(~signr);
+		clear_bit(signr, &current->signal);
+		sa = current->sig->action + signr;
+		signr++;
+		if ((current->flags & PF_PTRACED) && signr != SIGKILL) {
+			current->exit_code = signr;
+			current->state = TASK_STOPPED;
+			notify_parent(current);
+			schedule();
+			if (!(signr = current->exit_code))
+				continue;
+			current->exit_code = 0;
+			if (signr == SIGSTOP)
+				continue;
+			if (_S(signr) & current->blocked) {
+				current->signal |= _S(signr);
+				continue;
+			}
+			sa = current->sig->action + signr - 1;
+		}
+		if (sa->sa_handler == SIG_IGN) {
+			if (signr != SIGCHLD)
+				continue;
+			/* check for SIGCHLD: it's special */
+			while (sys_waitpid(-1,NULL,WNOHANG) > 0)
+				/* nothing */;
+			continue;
+		}
+		if (sa->sa_handler == SIG_DFL) {
+			if (current->pid == 1)
+				continue;
+			switch (signr) {
+			case SIGCONT: case SIGCHLD: case SIGWINCH:
+				continue;
+
+			case SIGSTOP: case SIGTSTP: case SIGTTIN: case SIGTTOU:
+				if (current->flags & PF_PTRACED)
+					continue;
+				current->state = TASK_STOPPED;
+				current->exit_code = signr;
+				if (!(current->p_pptr->sig->action[SIGCHLD-1].sa_flags & 
+						SA_NOCLDSTOP))
+					notify_parent(current);
+				schedule();
+				continue;
+
+			case SIGQUIT: case SIGILL: case SIGTRAP:
+			case SIGIOT: case SIGFPE: case SIGSEGV: case SIGBUS:
+				if (current->binfmt && current->binfmt->core_dump) {
+					if (current->binfmt->core_dump(signr, regs))
+						signr |= 0x80;
+				}
+				/* fall through */
+			default:
+				current->signal |= _S(signr & 0x7f);
+				current->flags |= PF_SIGNALED;
+				do_exit(signr);
+			}
+		}
+		/*
+		 * OK, we're invoking a handler
+		 */
+		if (regs->orig_reg2 >= 0) {
+			if (regs->regs[2] == ERESTARTNOHAND) {
+				regs->regs[2] = EINTR;
+			} else if((regs->regs[2] == ERESTARTSYS &&
+				   !(sa->sa_flags & SA_RESTART))) {
+				regs->regs[2] = regs->orig_reg2;
+				regs->cp0_epc -= 8;
+			}
+		}
+		handler_signal |= 1 << (signr-1);
+		mask &= ~*to_k_sigset_t(&sa->sa_mask);
+	}
+	/*
+	 * 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->orig_reg2 >= 0 &&
+	    (regs->regs[2] == ERESTARTNOHAND ||
+	     regs->regs[2] == ERESTARTSYS ||
+	     regs->regs[2] == ERESTARTNOINTR)) {
+		regs->regs[2] = regs->orig_reg2;
+		regs->cp0_epc -= 8;
+	}
+	if (!handler_signal)		/* no handler will be called - return 0 */
+		return 0;
+	signr = 1;
+	sa = current->sig->action;
+	for (mask = 1 ; mask ; sa++,signr++,mask += mask) {
+		if (mask > handler_signal)
+			break;
+		if (!(mask & handler_signal))
+			continue;
+		setup_irix_frame(sa, regs, signr, oldmask);
+		if (sa->sa_flags & SA_ONESHOT)
+			sa->sa_handler = NULL;
+		current->blocked |= *to_k_sigset_t(&sa->sa_mask);
+		oldmask |= *to_k_sigset_t(&sa->sa_mask);
+	}
+
+	return 1;
+}
+
+asmlinkage unsigned long irix_sigreturn(struct pt_regs *regs)
+{
+	struct sigctx_irix5 *context, *magic;
+	unsigned long umask, mask;
+	u64 *fregs, res;
+	int sig, i, base = 0;
+
+	if(regs->regs[2] == 1000)
+		base = 1;
+
+	context = (struct sigctx_irix5 *) regs->regs[base + 4];
+	magic = (struct sigctx_irix5 *) regs->regs[base + 5];
+	sig = (int) regs->regs[base + 6];
+#ifdef DEBUG_SIG
+	printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
+	       current->comm, current->pid, context, magic, sig);
+#endif
+	if (!context)
+		context = magic;
+	if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
+		goto badframe;
+
+#ifdef DEBUG_SIG
+	dump_irix5_sigctx(context);
+#endif
+
+	__get_user(regs->cp0_epc, &context->pc);
+	umask = context->rmask; mask = 2;
+	for (i = 1; i < 32; i++, mask <<= 1) {
+		if(umask & mask)
+			__get_user(regs->regs[i], &context->regs[i]);
+	}
+	__get_user(regs->hi, &context->hi);
+	__get_user(regs->lo, &context->lo);
+
+	if ((umask & 1) && context->usedfp) {
+		fregs = (u64 *) &current->tss.fpu;
+		for(i = 0; i < 32; i++)
+			fregs[i] = (u64) context->fpregs[i];
+		__get_user(current->tss.fpu.hard.control, &context->fpcsr);
+	}
+
+	/* XXX do sigstack crapola here... XXX */
+
+	regs->orig_reg2 = -1;
+	__get_user(current->blocked, &context->sigset[0]);
+	current->blocked &= _BLOCKABLE;
+	__get_user(res, &context->regs[2]);
+	return res;
+
+badframe:
+	do_exit(SIGSEGV);
+}
+
+struct sigact_irix5 {
+	int flags;
+	void (*handler)(int);
+	u32 sigset[4];
+	int _unused0[2];
+};
+
+#ifdef DEBUG_SIG
+static inline void dump_sigact_irix5(struct sigact_irix5 *p)
+{
+	printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
+	       (unsigned long) p->handler,
+	       (unsigned long) p->sigset[0]);
+}
+#endif
+
+static inline void check_pending(int signum)
+{
+	struct sigaction *p;
+
+	p = signum - 1 + current->sig->action;
+	if (p->sa_handler == SIG_IGN) {
+		current->signal &= ~_S(signum);
+		return;
+	}
+	if (p->sa_handler == SIG_DFL) {
+		if (signum != SIGCONT && signum != SIGCHLD && signum != SIGWINCH)
+			return;
+		current->signal &= ~_S(signum);
+		return;
+	}	
+}
+
+asmlinkage int irix_sigaction(int sig, struct sigact_irix5 *new,
+			      struct sigact_irix5 *old, unsigned long trampoline)
+{
+	struct sigaction new_sa, *p;
+
+#ifdef DEBUG_SIG
+	printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
+	       (!old ? "0" : "OLD"), trampoline);
+	if(new) {
+		dump_sigact_irix5(new); printk(" ");
+	}
+#endif
+	if(sig < 1 || sig > 32)
+		return -EINVAL;
+	p = sig - 1 + current->sig->action;
+
+	if(new) {
+		int err = verify_area(VERIFY_READ, new, sizeof(*new));
+		if(err)
+			return err;
+		if(sig == SIGKILL || sig == SIGSTOP)
+			return -EINVAL;
+		new_sa.sa_flags = new->flags;
+		new_sa.sa_handler = (__sighandler_t) new->handler;
+		new_sa.sa_mask.__sigbits[1] = new_sa.sa_mask.__sigbits[2] =
+			new_sa.sa_mask.__sigbits[3] = 0;
+		new_sa.sa_mask.__sigbits[0] = new->sigset[0];
+
+		if(new_sa.sa_handler != SIG_DFL && new_sa.sa_handler != SIG_IGN) {
+			err = verify_area(VERIFY_READ, new_sa.sa_handler, 1);
+			if(err)
+				return err;
+		}
+	}
+	/* Hmmm... methinks IRIX libc always passes a valid trampoline
+	 * value for all invocations of sigaction.  Will have to
+	 * investigate.  POSIX POSIX, die die die...
+	 */
+	current->tss.irix_trampoline = trampoline;
+	if(old) {
+		int err = verify_area(VERIFY_WRITE, old, sizeof(*old));
+		if(err)
+			return err;
+		old->flags = p->sa_flags;
+		old->handler = (void *) p->sa_handler;
+		old->sigset[1] = old->sigset[2] = old->sigset[3] = 0;
+		old->sigset[0] = p->sa_mask.__sigbits[0];
+		old->_unused0[0] = old->_unused0[1] = 0;
+	}
+
+	if(new) {
+		*p = new_sa;
+		check_pending(sig);
+	}
+
+	return 0;
+}
+
+asmlinkage int irix_sigpending(unsigned long *set)
+{
+	int err;
+
+	err = verify_area(VERIFY_WRITE, set, (sizeof(unsigned long) * 4));
+	if(!err) {
+		set[1] = set[2] = set[3] = 0;
+		set[0] = (current->blocked & current->signal);
+	}
+	return err;
+}
+
+asmlinkage int irix_sigprocmask(int how, unsigned long *new, unsigned long *old)
+{
+	unsigned long bits, oldbits = current->blocked;
+	int error;
+
+	if(new) {
+		error = verify_area(VERIFY_READ, new, (sizeof(unsigned long) * 4));
+		if(error)
+			return error;
+		bits = new[0] & _BLOCKABLE;
+		switch(how) {
+		case 1:
+			current->blocked |= bits;
+			break;
+
+		case 2:
+			current->blocked &= ~bits;
+			break;
+
+		case 3:
+		case 256:
+			current->blocked = bits;
+			break;
+
+		default:
+			return -EINVAL;
+		}
+	}
+	if(old) {
+		error = verify_area(VERIFY_WRITE, old, (sizeof(unsigned long) * 4));
+		if(error)
+			return error;
+		old[1] = old[2] = old[3] = 0;
+		old[0] = oldbits;
+	}
+	return 0;
+}
+
+asmlinkage int irix_sigsuspend(struct pt_regs *regs)
+{
+	unsigned int mask;
+	unsigned long *uset;
+	int base = 0;
+
+	if(regs->regs[2] == 1000)
+		base = 1;
+
+	mask = current->blocked;
+	uset = (unsigned long *) regs->regs[base + 4];
+	if(verify_area(VERIFY_READ, uset, (sizeof(unsigned long) * 4)))
+		return -EFAULT;
+	current->blocked = uset[0] & _BLOCKABLE;
+	while(1) {
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		if(do_irix_signal(mask, regs))
+			return -EINTR;
+	}
+}
+
+/* hate hate hate... */
+struct irix5_siginfo {
+	int sig, code, error;
+	union {
+		char unused[128 - (3 * 4)]; /* Safety net. */
+		struct {
+			int pid;
+			union {
+				int uid;
+				struct {
+					int utime, status, stime;
+				} child;
+			} procdata;
+		} procinfo;
+
+		unsigned long fault_addr;
+
+		struct {
+			int fd;
+			long band;
+		} fileinfo;
+
+		unsigned long sigval;
+	} stuff;
+};
+
+static inline unsigned long timespectojiffies(struct timespec *value)
+{
+	unsigned long sec = (unsigned) value->tv_sec;
+	long nsec = value->tv_nsec;
+
+	if (sec > (LONG_MAX / HZ))
+		return LONG_MAX;
+	nsec += 1000000000L / HZ - 1;
+	nsec /= 1000000000L / HZ;
+	return HZ * sec + nsec;
+}
+
+asmlinkage int irix_sigpoll_sys(unsigned long *set, struct irix5_siginfo *info,
+				struct timespec *tp)
+{
+	unsigned long mask, kset, expire = 0;
+	int sig, error, timeo = 0;
+
+#ifdef DEBUG_SIG
+	printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
+	       current->comm, current->pid, set, info, tp);
+#endif
+
+	/* Must always specify the signal set. */
+	if(!set)
+		return -EINVAL;
+	kset = set[0];
+
+	error = verify_area(VERIFY_READ, set, (sizeof(unsigned long) * 4));
+	if(error)
+		return error;
+
+	if(info) {
+		error = verify_area(VERIFY_WRITE, info, sizeof(*info));
+		if(error)
+			return error;
+		memset(info, 0, sizeof(*info));
+	}
+
+	if(tp) {
+		error = verify_area(VERIFY_READ, tp, sizeof(*tp));
+		if(error)
+			return error;
+		if(!tp->tv_sec && !tp->tv_nsec)
+			return -EINVAL;
+		expire = timespectojiffies(tp)+(tp->tv_sec||tp->tv_nsec)+jiffies;
+		current->timeout = expire;
+	}
+
+	while(1) {
+		current->state = TASK_INTERRUPTIBLE; schedule();
+		if(current->signal & kset) break;
+		if(tp && expire <= jiffies) {
+			timeo = 1;
+			break;
+		}
+		if(current->signal & ~(current->blocked)) return -EINTR;
+	}
+
+	if(timeo) return -EAGAIN;
+	for(sig = 1, mask = 2; mask; mask <<= 1, sig++) {
+		if(!(mask & kset)) continue;
+		if(mask & current->signal) {
+			/* XXX need more than this... */
+			if(info) info->sig = sig;
+			return 0;
+		}
+	}
+
+	/* Should not get here, but do something sane if we do. */
+	return -EINTR;
+}
+
+/* This is here because of irix5_siginfo definition. */
+#define P_PID    0
+#define P_PGID   2
+#define P_ALL    7
+
+extern int getrusage(struct task_struct *, int, struct rusage *);
+extern void release(struct task_struct * p);
+
+#define W_EXITED     1
+#define W_TRAPPED    2
+#define W_STOPPED    4
+#define W_CONT       8
+#define W_NOHANG    64
+
+#define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
+
+asmlinkage int irix_waitsys(int type, int pid, struct irix5_siginfo *info,
+			    int options, struct rusage *ru)
+{
+	int flag, retval;
+	struct wait_queue wait = { current, NULL };
+	struct task_struct *p;
+
+	if(!info)
+		return -EINVAL;
+	flag = verify_area(VERIFY_WRITE, info, sizeof(*info));
+	if(flag)
+		return flag;
+	if(ru) {
+		flag = verify_area(VERIFY_WRITE, ru, sizeof(*ru));
+		if(flag)
+			return flag;
+	}
+	if(options & ~(W_MASK))
+		return -EINVAL;
+	if(type != P_PID && type != P_PGID && type != P_ALL)
+		return -EINVAL;
+	add_wait_queue(&current->wait_chldexit, &wait);
+repeat:
+	flag = 0;
+	for(p = current->p_cptr; p; p = p->p_osptr) {
+		if((type == P_PID) && p->pid != pid)
+			continue;
+		if((type == P_PGID) && p->pgrp != pid)
+			continue;
+		if((p->exit_signal != SIGCHLD))
+			continue;
+		flag = 1;
+		switch(p->state) {
+			case TASK_STOPPED:
+				if (!p->exit_code)
+					continue;
+				if (!(options & (W_TRAPPED|W_STOPPED)) &&
+				    !(p->flags & PF_PTRACED))
+					continue;
+				if (ru != NULL)
+					getrusage(p, RUSAGE_BOTH, ru);
+				info->sig = SIGCHLD;
+				info->code = 0;
+				info->stuff.procinfo.pid = p->pid;
+				info->stuff.procinfo.procdata.child.status =
+					(p->exit_code >> 8) & 0xff;
+				info->stuff.procinfo.procdata.child.utime =
+					p->utime;
+				info->stuff.procinfo.procdata.child.stime =
+					p->stime;
+				p->exit_code = 0;
+				retval = 0;
+				goto end_waitsys;
+			case TASK_ZOMBIE:
+				current->cutime += p->utime + p->cutime;
+				current->cstime += p->stime + p->cstime;
+				if (ru != NULL)
+					getrusage(p, RUSAGE_BOTH, ru);
+				info->sig = SIGCHLD;
+				info->code = 1;      /* CLD_EXITED */
+				info->stuff.procinfo.pid = p->pid;
+				info->stuff.procinfo.procdata.child.status =
+					(p->exit_code >> 8) & 0xff;
+				info->stuff.procinfo.procdata.child.utime =
+					p->utime;
+				info->stuff.procinfo.procdata.child.stime =
+					p->stime;
+				retval = 0;
+				if (p->p_opptr != p->p_pptr) {
+					REMOVE_LINKS(p);
+					p->p_pptr = p->p_opptr;
+					SET_LINKS(p);
+					notify_parent(p);
+				} else
+					release(p);
+				goto end_waitsys;
+			default:
+				continue;
+		}
+	}
+	if(flag) {
+		retval = 0;
+		if(options & W_NOHANG)
+			goto end_waitsys;
+		retval = -ERESTARTSYS;
+		if(current->signal & ~current->blocked)
+			goto end_waitsys;
+		current->state = TASK_INTERRUPTIBLE;
+		schedule();
+		goto repeat;
+	}
+	retval = -ECHILD;
+end_waitsys:
+	remove_wait_queue(&current->wait_chldexit, &wait);
+	return retval;
+}
+
+struct irix5_context {
+	u32 flags;
+	u32 link;
+	u32 sigmask[4];
+	struct { u32 sp, size, flags; } stack;
+	int regs[36];
+	u32 fpregs[32];
+	u32 fpcsr;
+	u32 _unused0;
+	u32 _unused1[47];
+	u32 weird_graphics_thing;
+};
+
+asmlinkage int irix_getcontext(struct pt_regs *regs)
+{
+	int error, i, base = 0;
+	struct irix5_context *ctx;
+
+	if(regs->regs[2] == 1000)
+		base = 1;
+	ctx = (struct irix5_context *) regs->regs[base + 4];
+
+#ifdef DEBUG_SIG
+	printk("[%s:%d] irix_getcontext(%p)\n",
+	       current->comm, current->pid, ctx);
+#endif
+
+	error = verify_area(VERIFY_WRITE, ctx, sizeof(*ctx));
+	if(error)
+		return error;
+	ctx->flags = 0x0f;
+	ctx->link = current->tss.irix_oldctx;
+	ctx->sigmask[1] = ctx->sigmask[2] = ctx->sigmask[4] = 0;
+	ctx->sigmask[0] = current->blocked;
+
+	/* XXX Do sigstack stuff someday... */
+	ctx->stack.sp = ctx->stack.size = ctx->stack.flags = 0;
+
+	ctx->weird_graphics_thing = 0;
+	ctx->regs[0] = 0;
+	for(i = 1; i < 32; i++)
+		ctx->regs[i] = regs->regs[i];
+	ctx->regs[32] = regs->lo;
+	ctx->regs[33] = regs->hi;
+	ctx->regs[34] = regs->cp0_cause;
+	ctx->regs[35] = regs->cp0_epc;
+	if(!current->used_math) {
+		ctx->flags &= ~(0x08);
+	} else {
+		/* XXX wheee... */
+		printk("Wheee, no code for saving IRIX FPU context yet.\n");
+	}
+	return 0;
+}
+
+asmlinkage unsigned long irix_setcontext(struct pt_regs *regs)
+{
+	int error, base = 0;
+	struct irix5_context *ctx;
+
+	if(regs->regs[2] == 1000)
+		base = 1;
+	ctx = (struct irix5_context *) regs->regs[base + 4];
+
+#ifdef DEBUG_SIG
+	printk("[%s:%d] irix_setcontext(%p)\n",
+	       current->comm, current->pid, ctx);
+#endif
+
+	error = verify_area(VERIFY_READ, ctx, sizeof(*ctx));
+	if(error)
+		return error;
+
+	if(ctx->flags & 0x02) {
+		/* XXX sigstack garbage, todo... */
+		printk("Wheee, cannot do sigstack stuff in setcontext\n");
+	}
+
+	if(ctx->flags & 0x04) {
+		int i;
+
+		/* XXX extra control block stuff... todo... */
+		for(i = 1; i < 32; i++)
+			regs->regs[i] = ctx->regs[i];
+		regs->lo = ctx->regs[32];
+		regs->hi = ctx->regs[33];
+		regs->cp0_epc = ctx->regs[35];
+	}
+
+	if(ctx->flags & 0x08) {
+		/* XXX fpu context, blah... */
+		printk("Wheee, cannot restore FPU context yet...\n");
+	}
+	current->tss.irix_oldctx = ctx->link;
+	return regs->regs[2];
+}
+
+struct irix_sigstack { unsigned long sp; int status; };
+
+asmlinkage int irix_sigstack(struct irix_sigstack *new, struct irix_sigstack *old)
+{
+	int error;
+
+#ifdef DEBUG_SIG
+	printk("[%s:%d] irix_sigstack(%p,%p)\n",
+	       current->comm, current->pid, new, old);
+#endif
+	if(new) {
+		error = verify_area(VERIFY_READ, new, sizeof(*new));
+		if(error)
+			return error;
+	}
+
+	if(old) {
+		error = verify_area(VERIFY_WRITE, old, sizeof(*old));
+		if(error)
+			return error;
+	}
+	return 0;
+}
+
+struct irix_sigaltstack { unsigned long sp; int size; int status; };
+
+asmlinkage int irix_sigaltstack(struct irix_sigaltstack *new,
+				struct irix_sigaltstack *old)
+{
+	int error;
+
+#ifdef DEBUG_SIG
+	printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
+	       current->comm, current->pid, new, old);
+#endif
+	if(new) {
+		error = verify_area(VERIFY_READ, new, sizeof(*new));
+		if(error)
+			return error;
+	}
+
+	if(old) {
+		error = verify_area(VERIFY_WRITE, old, sizeof(*old));
+		if(error)
+			return error;
+	}
+	return 0;
+}
+
+struct irix_procset {
+	int cmd, ltype, lid, rtype, rid;
+};
+
+asmlinkage int irix_sigsendset(struct irix_procset *pset, int sig)
+{
+	int error;
+
+	error = verify_area(VERIFY_READ, pset, sizeof(*pset));
+#ifdef DEBUG_SIG
+	printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
+	       current->comm, current->pid,
+	       pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
+	       sig);
+#endif
+
+	return -EINVAL;
+}