Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[linux-2.6] / arch / mips / kernel / irixsig.c
1 /*
2  * irixsig.c: WHEEE, IRIX signals!  YOW, am I compatible or what?!?!
3  *
4  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
5  * Copyright (C) 1997 - 2000 Ralf Baechle (ralf@gnu.org)
6  * Copyright (C) 2000 Silicon Graphics, Inc.
7  */
8 #include <linux/kernel.h>
9 #include <linux/sched.h>
10 #include <linux/mm.h>
11 #include <linux/errno.h>
12 #include <linux/smp.h>
13 #include <linux/smp_lock.h>
14 #include <linux/time.h>
15 #include <linux/ptrace.h>
16
17 #include <asm/ptrace.h>
18 #include <asm/uaccess.h>
19
20 #undef DEBUG_SIG
21
22 #define _S(nr) (1<<((nr)-1))
23
24 #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
25
26 typedef struct {
27         unsigned long sig[4];
28 } irix_sigset_t;
29
30 struct sigctx_irix5 {
31         u32 rmask, cp0_status;
32         u64 pc;
33         u64 regs[32];
34         u64 fpregs[32];
35         u32 usedfp, fpcsr, fpeir, sstk_flags;
36         u64 hi, lo;
37         u64 cp0_cause, cp0_badvaddr, _unused0;
38         irix_sigset_t sigset;
39         u64 weird_fpu_thing;
40         u64 _unused1[31];
41 };
42
43 #ifdef DEBUG_SIG
44 /* Debugging */
45 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
46 {
47         int i;
48
49         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
50                (unsigned long) c->rmask,
51                (unsigned long) c->cp0_status,
52                (unsigned long) c->pc);
53         printk("regs: ");
54         for(i = 0; i < 16; i++)
55                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
56         printk("\nregs: ");
57         for(i = 16; i < 32; i++)
58                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
59         printk("\nfpregs: ");
60         for(i = 0; i < 16; i++)
61                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
62         printk("\nfpregs: ");
63         for(i = 16; i < 32; i++)
64                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
65         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
66                (int) c->usedfp, (unsigned long) c->fpcsr,
67                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
68         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
69                (unsigned long) c->hi, (unsigned long) c->lo,
70                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
71         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
72                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
73                (unsigned long) c->sigset.sig[1],
74                (unsigned long) c->sigset.sig[2],
75                (unsigned long) c->sigset.sig[3]);
76 }
77 #endif
78
79 static int setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
80                             int signr, sigset_t *oldmask)
81 {
82         struct sigctx_irix5 __user *ctx;
83         unsigned long sp;
84         int error, i;
85
86         sp = regs->regs[29];
87         sp -= sizeof(struct sigctx_irix5);
88         sp &= ~(0xf);
89         ctx = (struct sigctx_irix5 __user *) sp;
90         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
91                 goto segv_and_exit;
92
93         error = __put_user(0, &ctx->weird_fpu_thing);
94         error |= __put_user(~(0x00000001), &ctx->rmask);
95         error |= __put_user(0, &ctx->regs[0]);
96         for(i = 1; i < 32; i++)
97                 error |= __put_user((u64) regs->regs[i], &ctx->regs[i]);
98
99         error |= __put_user((u64) regs->hi, &ctx->hi);
100         error |= __put_user((u64) regs->lo, &ctx->lo);
101         error |= __put_user((u64) regs->cp0_epc, &ctx->pc);
102         error |= __put_user(!!used_math(), &ctx->usedfp);
103         error |= __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
104         error |= __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
105
106         error |= __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
107
108         error |= __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t)) ? -EFAULT : 0;
109
110         if (error)
111                 goto segv_and_exit;
112
113 #ifdef DEBUG_SIG
114         dump_irix5_sigctx(ctx);
115 #endif
116
117         regs->regs[4] = (unsigned long) signr;
118         regs->regs[5] = 0; /* XXX sigcode XXX */
119         regs->regs[6] = regs->regs[29] = sp;
120         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
121         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
122
123         return 1;
124
125 segv_and_exit:
126         force_sigsegv(signr, current);
127         return 0;
128 }
129
130 static int inline
131 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
132                int signr, sigset_t *oldmask, siginfo_t *info)
133 {
134         printk("Aiee: setup_tr_frame wants to be written");
135         do_exit(SIGSEGV);
136 }
137
138 static inline int handle_signal(unsigned long sig, siginfo_t *info,
139         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
140 {
141         int ret;
142
143         switch(regs->regs[0]) {
144         case ERESTARTNOHAND:
145                 regs->regs[2] = EINTR;
146                 break;
147         case ERESTARTSYS:
148                 if(!(ka->sa.sa_flags & SA_RESTART)) {
149                         regs->regs[2] = EINTR;
150                         break;
151                 }
152         /* fallthrough */
153         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
154                 regs->cp0_epc -= 8;
155         }
156
157         regs->regs[0] = 0;              /* Don't deal with this again.  */
158
159         if (ka->sa.sa_flags & SA_SIGINFO)
160                 ret = setup_irix_rt_frame(ka, regs, sig, oldset, info);
161         else
162                 ret = setup_irix_frame(ka, regs, sig, oldset);
163
164         spin_lock_irq(&current->sighand->siglock);
165         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
166         if (!(ka->sa.sa_flags & SA_NODEFER))
167                 sigaddset(&current->blocked,sig);
168         recalc_sigpending();
169         spin_unlock_irq(&current->sighand->siglock);
170
171         return ret;
172 }
173
174 asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
175 {
176         struct k_sigaction ka;
177         siginfo_t info;
178         int signr;
179
180         /*
181          * We want the common case to go fast, which is why we may in certain
182          * cases get here from kernel mode. Just return without doing anything
183          * if so.
184          */
185         if (!user_mode(regs))
186                 return 1;
187
188         if (try_to_freeze())
189                 goto no_signal;
190
191         if (!oldset)
192                 oldset = &current->blocked;
193
194         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
195         if (signr > 0)
196                 return handle_signal(signr, &info, &ka, oldset, regs);
197
198 no_signal:
199         /*
200          * Who's code doesn't conform to the restartable syscall convention
201          * dies here!!!  The li instruction, a single machine instruction,
202          * must directly be followed by the syscall instruction.
203          */
204         if (regs->regs[0]) {
205                 if (regs->regs[2] == ERESTARTNOHAND ||
206                     regs->regs[2] == ERESTARTSYS ||
207                     regs->regs[2] == ERESTARTNOINTR) {
208                         regs->cp0_epc -= 8;
209                 }
210         }
211         return 0;
212 }
213
214 asmlinkage void
215 irix_sigreturn(struct pt_regs *regs)
216 {
217         struct sigctx_irix5 __user *context, *magic;
218         unsigned long umask, mask;
219         u64 *fregs;
220         u32 usedfp;
221         int error, sig, i, base = 0;
222         sigset_t blocked;
223
224         /* Always make any pending restarted system calls return -EINTR */
225         current_thread_info()->restart_block.fn = do_no_restart_syscall;
226
227         if (regs->regs[2] == 1000)
228                 base = 1;
229
230         context = (struct sigctx_irix5 __user *) regs->regs[base + 4];
231         magic = (struct sigctx_irix5 __user *) regs->regs[base + 5];
232         sig = (int) regs->regs[base + 6];
233 #ifdef DEBUG_SIG
234         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
235                current->comm, current->pid, context, magic, sig);
236 #endif
237         if (!context)
238                 context = magic;
239         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
240                 goto badframe;
241
242 #ifdef DEBUG_SIG
243         dump_irix5_sigctx(context);
244 #endif
245
246         error = __get_user(regs->cp0_epc, &context->pc);
247         error |= __get_user(umask, &context->rmask);
248
249         mask = 2;
250         for (i = 1; i < 32; i++, mask <<= 1) {
251                 if (umask & mask)
252                         error |= __get_user(regs->regs[i], &context->regs[i]);
253         }
254         error |= __get_user(regs->hi, &context->hi);
255         error |= __get_user(regs->lo, &context->lo);
256
257         error |= __get_user(usedfp, &context->usedfp);
258         if ((umask & 1) && usedfp) {
259                 fregs = (u64 *) &current->thread.fpu;
260
261                 for(i = 0; i < 32; i++)
262                         error |= __get_user(fregs[i], &context->fpregs[i]);
263                 error |= __get_user(current->thread.fpu.hard.fcr31, &context->fpcsr);
264         }
265
266         /* XXX do sigstack crapola here... XXX */
267
268         error |= __copy_from_user(&blocked, &context->sigset, sizeof(blocked)) ? -EFAULT : 0;
269
270         if (error)
271                 goto badframe;
272
273         sigdelsetmask(&blocked, ~_BLOCKABLE);
274         spin_lock_irq(&current->sighand->siglock);
275         current->blocked = blocked;
276         recalc_sigpending();
277         spin_unlock_irq(&current->sighand->siglock);
278
279         /*
280          * Don't let your children do this ...
281          */
282         if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
283                 do_syscall_trace(regs, 1);
284         __asm__ __volatile__(
285                 "move\t$29,%0\n\t"
286                 "j\tsyscall_exit"
287                 :/* no outputs */
288                 :"r" (&regs));
289                 /* Unreached */
290
291 badframe:
292         force_sig(SIGSEGV, current);
293 }
294
295 struct sigact_irix5 {
296         int flags;
297         void (*handler)(int);
298         u32 sigset[4];
299         int _unused0[2];
300 };
301
302 #ifdef DEBUG_SIG
303 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
304 {
305         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
306                (unsigned long) p->handler,
307                (unsigned long) p->sigset[0]);
308 }
309 #endif
310
311 asmlinkage int
312 irix_sigaction(int sig, const struct sigaction __user *act,
313               struct sigaction __user *oact, void __user *trampoline)
314 {
315         struct k_sigaction new_ka, old_ka;
316         int ret;
317
318 #ifdef DEBUG_SIG
319         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
320                (!old ? "0" : "OLD"), trampoline);
321         if(new) {
322                 dump_sigact_irix5(new); printk(" ");
323         }
324 #endif
325         if (act) {
326                 sigset_t mask;
327                 int err;
328
329                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
330                         return -EFAULT;
331                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
332                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
333
334                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
335                 if (err)
336                         return err;
337
338                 /*
339                  * Hmmm... methinks IRIX libc always passes a valid trampoline
340                  * value for all invocations of sigaction.  Will have to
341                  * investigate.  POSIX POSIX, die die die...
342                  */
343                 new_ka.sa_restorer = trampoline;
344         }
345
346 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
347         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
348
349         if (!ret && oact) {
350                 int err;
351
352                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
353                         return -EFAULT;
354
355                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
356                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
357                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
358                                sizeof(sigset_t)) ? -EFAULT : 0;
359                 if (err)
360                         return -EFAULT;
361         }
362
363         return ret;
364 }
365
366 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
367 {
368         return do_sigpending(set, sizeof(*set));
369 }
370
371 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
372         irix_sigset_t __user *old)
373 {
374         sigset_t oldbits, newbits;
375
376         if (new) {
377                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
378                         return -EFAULT;
379                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
380                         return -EFAULT;
381                 sigdelsetmask(&newbits, ~_BLOCKABLE);
382
383                 spin_lock_irq(&current->sighand->siglock);
384                 oldbits = current->blocked;
385
386                 switch(how) {
387                 case 1:
388                         sigorsets(&newbits, &oldbits, &newbits);
389                         break;
390
391                 case 2:
392                         sigandsets(&newbits, &oldbits, &newbits);
393                         break;
394
395                 case 3:
396                         break;
397
398                 case 256:
399                         siginitset(&newbits, newbits.sig[0]);
400                         break;
401
402                 default:
403                         return -EINVAL;
404                 }
405                 recalc_sigpending();
406                 spin_unlock_irq(&current->sighand->siglock);
407         }
408         if (old)
409                 return copy_to_user(old, &current->blocked,
410                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
411
412         return 0;
413 }
414
415 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
416 {
417         sigset_t saveset, newset;
418         sigset_t __user *uset;
419
420         uset = (sigset_t __user *) regs->regs[4];
421         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
422                 return -EFAULT;
423         sigdelsetmask(&newset, ~_BLOCKABLE);
424
425         spin_lock_irq(&current->sighand->siglock);
426         saveset = current->blocked;
427         current->blocked = newset;
428         recalc_sigpending();
429         spin_unlock_irq(&current->sighand->siglock);
430
431         regs->regs[2] = -EINTR;
432         while (1) {
433                 current->state = TASK_INTERRUPTIBLE;
434                 schedule();
435                 if (do_irix_signal(&saveset, regs))
436                         return -EINTR;
437         }
438 }
439
440 /* hate hate hate... */
441 struct irix5_siginfo {
442         int sig, code, error;
443         union {
444                 char unused[128 - (3 * 4)]; /* Safety net. */
445                 struct {
446                         int pid;
447                         union {
448                                 int uid;
449                                 struct {
450                                         int utime, status, stime;
451                                 } child;
452                         } procdata;
453                 } procinfo;
454
455                 unsigned long fault_addr;
456
457                 struct {
458                         int fd;
459                         long band;
460                 } fileinfo;
461
462                 unsigned long sigval;
463         } stuff;
464 };
465
466 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
467         struct irix5_siginfo __user *info, struct timespec __user *tp)
468 {
469         long expire = MAX_SCHEDULE_TIMEOUT;
470         sigset_t kset;
471         int i, sig, error, timeo = 0;
472         struct timespec ktp;
473
474 #ifdef DEBUG_SIG
475         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
476                current->comm, current->pid, set, info, tp);
477 #endif
478
479         /* Must always specify the signal set. */
480         if (!set)
481                 return -EINVAL;
482
483         if (copy_from_user(&kset, set, sizeof(set)))
484                 return -EFAULT;
485
486         if (info && clear_user(info, sizeof(*info))) {
487                 error = -EFAULT;
488                 goto out;
489         }
490
491         if (tp) {
492                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
493                         return -EFAULT;
494
495                 if (!ktp.tv_sec && !ktp.tv_nsec)
496                         return -EINVAL;
497
498                 expire = timespec_to_jiffies(&ktp) +
499                          (ktp.tv_sec || ktp.tv_nsec);
500         }
501
502         while(1) {
503                 long tmp = 0;
504
505                 current->state = TASK_INTERRUPTIBLE;
506                 expire = schedule_timeout(expire);
507
508                 for (i=0; i<=4; i++)
509                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
510
511                 if (tmp)
512                         break;
513                 if (!expire) {
514                         timeo = 1;
515                         break;
516                 }
517                 if (signal_pending(current))
518                         return -EINTR;
519         }
520         if (timeo)
521                 return -EAGAIN;
522
523         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
524                 if (sigismember (&kset, sig))
525                         continue;
526                 if (sigismember (&current->pending.signal, sig)) {
527                         /* XXX need more than this... */
528                         if (info)
529                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
530                         return 0;
531                 }
532         }
533
534         /* Should not get here, but do something sane if we do. */
535         error = -EINTR;
536
537 out:
538         return error;
539 }
540
541 /* This is here because of irix5_siginfo definition. */
542 #define IRIX_P_PID    0
543 #define IRIX_P_PGID   2
544 #define IRIX_P_ALL    7
545
546 extern int getrusage(struct task_struct *, int, struct rusage __user *);
547
548 #define W_EXITED     1
549 #define W_TRAPPED    2
550 #define W_STOPPED    4
551 #define W_CONT       8
552 #define W_NOHANG    64
553
554 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
555
556 asmlinkage int irix_waitsys(int type, int pid,
557         struct irix5_siginfo __user *info, int options,
558         struct rusage __user *ru)
559 {
560         int flag, retval;
561         DECLARE_WAITQUEUE(wait, current);
562         struct task_struct *tsk;
563         struct task_struct *p;
564         struct list_head *_p;
565
566         if (!info)
567                 return -EINVAL;
568
569         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
570                 return -EFAULT;
571
572         if (ru)
573                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
574                         return -EFAULT;
575
576         if (options & ~W_MASK)
577                 return -EINVAL;
578
579         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
580                 return -EINVAL;
581
582         add_wait_queue(&current->signal->wait_chldexit, &wait);
583 repeat:
584         flag = 0;
585         current->state = TASK_INTERRUPTIBLE;
586         read_lock(&tasklist_lock);
587         tsk = current;
588         list_for_each(_p,&tsk->children) {
589                 p = list_entry(_p,struct task_struct,sibling);
590                 if ((type == IRIX_P_PID) && p->pid != pid)
591                         continue;
592                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
593                         continue;
594                 if ((p->exit_signal != SIGCHLD))
595                         continue;
596                 flag = 1;
597                 switch (p->state) {
598                 case TASK_STOPPED:
599                         if (!p->exit_code)
600                                 continue;
601                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
602                             !(p->ptrace & PT_PTRACED))
603                                 continue;
604                         read_unlock(&tasklist_lock);
605
606                         /* move to end of parent's list to avoid starvation */
607                         write_lock_irq(&tasklist_lock);
608                         remove_parent(p);
609                         add_parent(p, p->parent);
610                         write_unlock_irq(&tasklist_lock);
611                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
612                         if (retval)
613                                 goto end_waitsys;
614
615                         retval = __put_user(SIGCHLD, &info->sig);
616                         retval |= __put_user(0, &info->code);
617                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
618                         retval |= __put_user((p->exit_code >> 8) & 0xff,
619                                    &info->stuff.procinfo.procdata.child.status);
620                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
621                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
622                         if (retval)
623                                 goto end_waitsys;
624
625                         p->exit_code = 0;
626                         goto end_waitsys;
627
628                 case EXIT_ZOMBIE:
629                         current->signal->cutime += p->utime + p->signal->cutime;
630                         current->signal->cstime += p->stime + p->signal->cstime;
631                         if (ru != NULL)
632                                 getrusage(p, RUSAGE_BOTH, ru);
633                         retval = __put_user(SIGCHLD, &info->sig);
634                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
635                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
636                         retval |= __put_user((p->exit_code >> 8) & 0xff,
637                                    &info->stuff.procinfo.procdata.child.status);
638                         retval |= __put_user(p->utime,
639                                    &info->stuff.procinfo.procdata.child.utime);
640                         retval |= __put_user(p->stime,
641                                    &info->stuff.procinfo.procdata.child.stime);
642                         if (retval)
643                                 return retval;
644
645                         if (p->real_parent != p->parent) {
646                                 write_lock_irq(&tasklist_lock);
647                                 remove_parent(p);
648                                 p->parent = p->real_parent;
649                                 add_parent(p, p->parent);
650                                 do_notify_parent(p, SIGCHLD);
651                                 write_unlock_irq(&tasklist_lock);
652                         } else
653                                 release_task(p);
654                         goto end_waitsys;
655                 default:
656                         continue;
657                 }
658                 tsk = next_thread(tsk);
659         }
660         read_unlock(&tasklist_lock);
661         if (flag) {
662                 retval = 0;
663                 if (options & W_NOHANG)
664                         goto end_waitsys;
665                 retval = -ERESTARTSYS;
666                 if (signal_pending(current))
667                         goto end_waitsys;
668                 current->state = TASK_INTERRUPTIBLE;
669                 schedule();
670                 goto repeat;
671         }
672         retval = -ECHILD;
673 end_waitsys:
674         current->state = TASK_RUNNING;
675         remove_wait_queue(&current->signal->wait_chldexit, &wait);
676
677         return retval;
678 }
679
680 struct irix5_context {
681         u32 flags;
682         u32 link;
683         u32 sigmask[4];
684         struct { u32 sp, size, flags; } stack;
685         int regs[36];
686         u32 fpregs[32];
687         u32 fpcsr;
688         u32 _unused0;
689         u32 _unused1[47];
690         u32 weird_graphics_thing;
691 };
692
693 asmlinkage int irix_getcontext(struct pt_regs *regs)
694 {
695         int error, i, base = 0;
696         struct irix5_context __user *ctx;
697         unsigned long flags;
698
699         if (regs->regs[2] == 1000)
700                 base = 1;
701         ctx = (struct irix5_context __user *) regs->regs[base + 4];
702
703 #ifdef DEBUG_SIG
704         printk("[%s:%d] irix_getcontext(%p)\n",
705                current->comm, current->pid, ctx);
706 #endif
707
708         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
709                 return -EFAULT;
710
711         error = __put_user(current->thread.irix_oldctx, &ctx->link);
712
713         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
714
715         /* XXX Do sigstack stuff someday... */
716         error |= __put_user(0, &ctx->stack.sp);
717         error |= __put_user(0, &ctx->stack.size);
718         error |= __put_user(0, &ctx->stack.flags);
719
720         error |= __put_user(0, &ctx->weird_graphics_thing);
721         error |= __put_user(0, &ctx->regs[0]);
722         for (i = 1; i < 32; i++)
723                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
724         error |= __put_user(regs->lo, &ctx->regs[32]);
725         error |= __put_user(regs->hi, &ctx->regs[33]);
726         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
727         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
728
729         flags = 0x0f;
730         if (!used_math()) {
731                 flags &= ~(0x08);
732         } else {
733                 /* XXX wheee... */
734                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
735         }
736         error |= __put_user(flags, &ctx->flags);
737
738         return error;
739 }
740
741 asmlinkage void irix_setcontext(struct pt_regs *regs)
742 {
743         struct irix5_context __user *ctx;
744         int err, base = 0;
745         u32 flags;
746
747         if (regs->regs[2] == 1000)
748                 base = 1;
749         ctx = (struct irix5_context __user *) regs->regs[base + 4];
750
751 #ifdef DEBUG_SIG
752         printk("[%s:%d] irix_setcontext(%p)\n",
753                current->comm, current->pid, ctx);
754 #endif
755
756         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
757                 goto segv_and_exit;
758
759         err = __get_user(flags, &ctx->flags);
760         if (flags & 0x02) {
761                 /* XXX sigstack garbage, todo... */
762                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
763         }
764
765         if (flags & 0x04) {
766                 int i;
767
768                 /* XXX extra control block stuff... todo... */
769                 for (i = 1; i < 32; i++)
770                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
771                 err |= __get_user(regs->lo, &ctx->regs[32]);
772                 err |= __get_user(regs->hi, &ctx->regs[33]);
773                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
774         }
775
776         if (flags & 0x08)
777                 /* XXX fpu context, blah... */
778                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
779
780         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
781         if (err)
782                 goto segv_and_exit;
783
784         /*
785          * Don't let your children do this ...
786          */
787         if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
788                 do_syscall_trace(regs, 1);
789         __asm__ __volatile__(
790                 "move\t$29,%0\n\t"
791                 "j\tsyscall_exit"
792                 :/* no outputs */
793                 :"r" (&regs));
794                 /* Unreached */
795
796 segv_and_exit:
797         force_sigsegv(SIGSEGV, current);
798 }
799
800 struct irix_sigstack {
801         unsigned long sp;
802         int status;
803 };
804
805 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
806         struct irix_sigstack __user *old)
807 {
808 #ifdef DEBUG_SIG
809         printk("[%s:%d] irix_sigstack(%p,%p)\n",
810                current->comm, current->pid, new, old);
811 #endif
812         if (new) {
813                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
814                         return -EFAULT;
815         }
816
817         if (old) {
818                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
819                         return -EFAULT;
820         }
821
822         return 0;
823 }
824
825 struct irix_sigaltstack { unsigned long sp; int size; int status; };
826
827 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
828                                 struct irix_sigaltstack __user *old)
829 {
830 #ifdef DEBUG_SIG
831         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
832                current->comm, current->pid, new, old);
833 #endif
834         if (new)
835                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
836                         return -EFAULT;
837
838         if (old) {
839                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
840                         return -EFAULT;
841         }
842
843         return 0;
844 }
845
846 struct irix_procset {
847         int cmd, ltype, lid, rtype, rid;
848 };
849
850 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
851 {
852         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
853                 return -EFAULT;
854 #ifdef DEBUG_SIG
855         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
856                current->comm, current->pid,
857                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
858                sig);
859 #endif
860         return -EINVAL;
861 }