[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
[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.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         __asm__ __volatile__(
283                 "move\t$29,%0\n\t"
284                 "j\tsyscall_exit"
285                 :/* no outputs */
286                 :"r" (&regs));
287                 /* Unreached */
288
289 badframe:
290         force_sig(SIGSEGV, current);
291 }
292
293 struct sigact_irix5 {
294         int flags;
295         void (*handler)(int);
296         u32 sigset[4];
297         int _unused0[2];
298 };
299
300 #ifdef DEBUG_SIG
301 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
302 {
303         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
304                (unsigned long) p->handler,
305                (unsigned long) p->sigset[0]);
306 }
307 #endif
308
309 asmlinkage int
310 irix_sigaction(int sig, const struct sigaction __user *act,
311               struct sigaction __user *oact, void __user *trampoline)
312 {
313         struct k_sigaction new_ka, old_ka;
314         int ret;
315
316 #ifdef DEBUG_SIG
317         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
318                (!old ? "0" : "OLD"), trampoline);
319         if(new) {
320                 dump_sigact_irix5(new); printk(" ");
321         }
322 #endif
323         if (act) {
324                 sigset_t mask;
325                 int err;
326
327                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
328                         return -EFAULT;
329                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
330                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
331
332                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
333                 if (err)
334                         return err;
335
336                 /*
337                  * Hmmm... methinks IRIX libc always passes a valid trampoline
338                  * value for all invocations of sigaction.  Will have to
339                  * investigate.  POSIX POSIX, die die die...
340                  */
341                 new_ka.sa_restorer = trampoline;
342         }
343
344 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
345         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
346
347         if (!ret && oact) {
348                 int err;
349
350                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
351                         return -EFAULT;
352
353                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
354                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
355                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
356                                sizeof(sigset_t)) ? -EFAULT : 0;
357                 if (err)
358                         return -EFAULT;
359         }
360
361         return ret;
362 }
363
364 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
365 {
366         return do_sigpending(set, sizeof(*set));
367 }
368
369 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
370         irix_sigset_t __user *old)
371 {
372         sigset_t oldbits, newbits;
373
374         if (new) {
375                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
376                         return -EFAULT;
377                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
378                         return -EFAULT;
379                 sigdelsetmask(&newbits, ~_BLOCKABLE);
380
381                 spin_lock_irq(&current->sighand->siglock);
382                 oldbits = current->blocked;
383
384                 switch(how) {
385                 case 1:
386                         sigorsets(&newbits, &oldbits, &newbits);
387                         break;
388
389                 case 2:
390                         sigandsets(&newbits, &oldbits, &newbits);
391                         break;
392
393                 case 3:
394                         break;
395
396                 case 256:
397                         siginitset(&newbits, newbits.sig[0]);
398                         break;
399
400                 default:
401                         return -EINVAL;
402                 }
403                 recalc_sigpending();
404                 spin_unlock_irq(&current->sighand->siglock);
405         }
406         if (old)
407                 return copy_to_user(old, &current->blocked,
408                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
409
410         return 0;
411 }
412
413 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
414 {
415         sigset_t saveset, newset;
416         sigset_t __user *uset;
417
418         uset = (sigset_t __user *) regs->regs[4];
419         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
420                 return -EFAULT;
421         sigdelsetmask(&newset, ~_BLOCKABLE);
422
423         spin_lock_irq(&current->sighand->siglock);
424         saveset = current->blocked;
425         current->blocked = newset;
426         recalc_sigpending();
427         spin_unlock_irq(&current->sighand->siglock);
428
429         regs->regs[2] = -EINTR;
430         while (1) {
431                 current->state = TASK_INTERRUPTIBLE;
432                 schedule();
433                 if (do_irix_signal(&saveset, regs))
434                         return -EINTR;
435         }
436 }
437
438 /* hate hate hate... */
439 struct irix5_siginfo {
440         int sig, code, error;
441         union {
442                 char unused[128 - (3 * 4)]; /* Safety net. */
443                 struct {
444                         int pid;
445                         union {
446                                 int uid;
447                                 struct {
448                                         int utime, status, stime;
449                                 } child;
450                         } procdata;
451                 } procinfo;
452
453                 unsigned long fault_addr;
454
455                 struct {
456                         int fd;
457                         long band;
458                 } fileinfo;
459
460                 unsigned long sigval;
461         } stuff;
462 };
463
464 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
465         struct irix5_siginfo __user *info, struct timespec __user *tp)
466 {
467         long expire = MAX_SCHEDULE_TIMEOUT;
468         sigset_t kset;
469         int i, sig, error, timeo = 0;
470         struct timespec ktp;
471
472 #ifdef DEBUG_SIG
473         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
474                current->comm, current->pid, set, info, tp);
475 #endif
476
477         /* Must always specify the signal set. */
478         if (!set)
479                 return -EINVAL;
480
481         if (copy_from_user(&kset, set, sizeof(set)))
482                 return -EFAULT;
483
484         if (info && clear_user(info, sizeof(*info))) {
485                 error = -EFAULT;
486                 goto out;
487         }
488
489         if (tp) {
490                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
491                         return -EFAULT;
492
493                 if (!ktp.tv_sec && !ktp.tv_nsec)
494                         return -EINVAL;
495
496                 expire = timespec_to_jiffies(&ktp) +
497                          (ktp.tv_sec || ktp.tv_nsec);
498         }
499
500         while(1) {
501                 long tmp = 0;
502
503                 expire = schedule_timeout_interruptible(expire);
504
505                 for (i=0; i<=4; i++)
506                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
507
508                 if (tmp)
509                         break;
510                 if (!expire) {
511                         timeo = 1;
512                         break;
513                 }
514                 if (signal_pending(current))
515                         return -EINTR;
516         }
517         if (timeo)
518                 return -EAGAIN;
519
520         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
521                 if (sigismember (&kset, sig))
522                         continue;
523                 if (sigismember (&current->pending.signal, sig)) {
524                         /* XXX need more than this... */
525                         if (info)
526                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
527                         return 0;
528                 }
529         }
530
531         /* Should not get here, but do something sane if we do. */
532         error = -EINTR;
533
534 out:
535         return error;
536 }
537
538 /* This is here because of irix5_siginfo definition. */
539 #define IRIX_P_PID    0
540 #define IRIX_P_PGID   2
541 #define IRIX_P_ALL    7
542
543 extern int getrusage(struct task_struct *, int, struct rusage __user *);
544
545 #define W_EXITED     1
546 #define W_TRAPPED    2
547 #define W_STOPPED    4
548 #define W_CONT       8
549 #define W_NOHANG    64
550
551 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
552
553 asmlinkage int irix_waitsys(int type, int pid,
554         struct irix5_siginfo __user *info, int options,
555         struct rusage __user *ru)
556 {
557         int flag, retval;
558         DECLARE_WAITQUEUE(wait, current);
559         struct task_struct *tsk;
560         struct task_struct *p;
561         struct list_head *_p;
562
563         if (!info)
564                 return -EINVAL;
565
566         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
567                 return -EFAULT;
568
569         if (ru)
570                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
571                         return -EFAULT;
572
573         if (options & ~W_MASK)
574                 return -EINVAL;
575
576         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
577                 return -EINVAL;
578
579         add_wait_queue(&current->signal->wait_chldexit, &wait);
580 repeat:
581         flag = 0;
582         current->state = TASK_INTERRUPTIBLE;
583         read_lock(&tasklist_lock);
584         tsk = current;
585         list_for_each(_p,&tsk->children) {
586                 p = list_entry(_p,struct task_struct,sibling);
587                 if ((type == IRIX_P_PID) && p->pid != pid)
588                         continue;
589                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
590                         continue;
591                 if ((p->exit_signal != SIGCHLD))
592                         continue;
593                 flag = 1;
594                 switch (p->state) {
595                 case TASK_STOPPED:
596                         if (!p->exit_code)
597                                 continue;
598                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
599                             !(p->ptrace & PT_PTRACED))
600                                 continue;
601                         read_unlock(&tasklist_lock);
602
603                         /* move to end of parent's list to avoid starvation */
604                         write_lock_irq(&tasklist_lock);
605                         remove_parent(p);
606                         add_parent(p);
607                         write_unlock_irq(&tasklist_lock);
608                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
609                         if (retval)
610                                 goto end_waitsys;
611
612                         retval = __put_user(SIGCHLD, &info->sig);
613                         retval |= __put_user(0, &info->code);
614                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
615                         retval |= __put_user((p->exit_code >> 8) & 0xff,
616                                    &info->stuff.procinfo.procdata.child.status);
617                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
618                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
619                         if (retval)
620                                 goto end_waitsys;
621
622                         p->exit_code = 0;
623                         goto end_waitsys;
624
625                 case EXIT_ZOMBIE:
626                         current->signal->cutime += p->utime + p->signal->cutime;
627                         current->signal->cstime += p->stime + p->signal->cstime;
628                         if (ru != NULL)
629                                 getrusage(p, RUSAGE_BOTH, ru);
630                         retval = __put_user(SIGCHLD, &info->sig);
631                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
632                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
633                         retval |= __put_user((p->exit_code >> 8) & 0xff,
634                                    &info->stuff.procinfo.procdata.child.status);
635                         retval |= __put_user(p->utime,
636                                    &info->stuff.procinfo.procdata.child.utime);
637                         retval |= __put_user(p->stime,
638                                    &info->stuff.procinfo.procdata.child.stime);
639                         if (retval)
640                                 return retval;
641
642                         if (p->real_parent != p->parent) {
643                                 write_lock_irq(&tasklist_lock);
644                                 remove_parent(p);
645                                 p->parent = p->real_parent;
646                                 add_parent(p);
647                                 do_notify_parent(p, SIGCHLD);
648                                 write_unlock_irq(&tasklist_lock);
649                         } else
650                                 release_task(p);
651                         goto end_waitsys;
652                 default:
653                         continue;
654                 }
655                 tsk = next_thread(tsk);
656         }
657         read_unlock(&tasklist_lock);
658         if (flag) {
659                 retval = 0;
660                 if (options & W_NOHANG)
661                         goto end_waitsys;
662                 retval = -ERESTARTSYS;
663                 if (signal_pending(current))
664                         goto end_waitsys;
665                 current->state = TASK_INTERRUPTIBLE;
666                 schedule();
667                 goto repeat;
668         }
669         retval = -ECHILD;
670 end_waitsys:
671         current->state = TASK_RUNNING;
672         remove_wait_queue(&current->signal->wait_chldexit, &wait);
673
674         return retval;
675 }
676
677 struct irix5_context {
678         u32 flags;
679         u32 link;
680         u32 sigmask[4];
681         struct { u32 sp, size, flags; } stack;
682         int regs[36];
683         u32 fpregs[32];
684         u32 fpcsr;
685         u32 _unused0;
686         u32 _unused1[47];
687         u32 weird_graphics_thing;
688 };
689
690 asmlinkage int irix_getcontext(struct pt_regs *regs)
691 {
692         int error, i, base = 0;
693         struct irix5_context __user *ctx;
694         unsigned long flags;
695
696         if (regs->regs[2] == 1000)
697                 base = 1;
698         ctx = (struct irix5_context __user *) regs->regs[base + 4];
699
700 #ifdef DEBUG_SIG
701         printk("[%s:%d] irix_getcontext(%p)\n",
702                current->comm, current->pid, ctx);
703 #endif
704
705         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
706                 return -EFAULT;
707
708         error = __put_user(current->thread.irix_oldctx, &ctx->link);
709
710         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
711
712         /* XXX Do sigstack stuff someday... */
713         error |= __put_user(0, &ctx->stack.sp);
714         error |= __put_user(0, &ctx->stack.size);
715         error |= __put_user(0, &ctx->stack.flags);
716
717         error |= __put_user(0, &ctx->weird_graphics_thing);
718         error |= __put_user(0, &ctx->regs[0]);
719         for (i = 1; i < 32; i++)
720                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
721         error |= __put_user(regs->lo, &ctx->regs[32]);
722         error |= __put_user(regs->hi, &ctx->regs[33]);
723         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
724         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
725
726         flags = 0x0f;
727         if (!used_math()) {
728                 flags &= ~(0x08);
729         } else {
730                 /* XXX wheee... */
731                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
732         }
733         error |= __put_user(flags, &ctx->flags);
734
735         return error;
736 }
737
738 asmlinkage void irix_setcontext(struct pt_regs *regs)
739 {
740         struct irix5_context __user *ctx;
741         int err, base = 0;
742         u32 flags;
743
744         if (regs->regs[2] == 1000)
745                 base = 1;
746         ctx = (struct irix5_context __user *) regs->regs[base + 4];
747
748 #ifdef DEBUG_SIG
749         printk("[%s:%d] irix_setcontext(%p)\n",
750                current->comm, current->pid, ctx);
751 #endif
752
753         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
754                 goto segv_and_exit;
755
756         err = __get_user(flags, &ctx->flags);
757         if (flags & 0x02) {
758                 /* XXX sigstack garbage, todo... */
759                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
760         }
761
762         if (flags & 0x04) {
763                 int i;
764
765                 /* XXX extra control block stuff... todo... */
766                 for (i = 1; i < 32; i++)
767                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
768                 err |= __get_user(regs->lo, &ctx->regs[32]);
769                 err |= __get_user(regs->hi, &ctx->regs[33]);
770                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
771         }
772
773         if (flags & 0x08)
774                 /* XXX fpu context, blah... */
775                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
776
777         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
778         if (err)
779                 goto segv_and_exit;
780
781         /*
782          * Don't let your children do this ...
783          */
784         __asm__ __volatile__(
785                 "move\t$29,%0\n\t"
786                 "j\tsyscall_exit"
787                 :/* no outputs */
788                 :"r" (&regs));
789                 /* Unreached */
790
791 segv_and_exit:
792         force_sigsegv(SIGSEGV, current);
793 }
794
795 struct irix_sigstack {
796         unsigned long sp;
797         int status;
798 };
799
800 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
801         struct irix_sigstack __user *old)
802 {
803 #ifdef DEBUG_SIG
804         printk("[%s:%d] irix_sigstack(%p,%p)\n",
805                current->comm, current->pid, new, old);
806 #endif
807         if (new) {
808                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
809                         return -EFAULT;
810         }
811
812         if (old) {
813                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
814                         return -EFAULT;
815         }
816
817         return 0;
818 }
819
820 struct irix_sigaltstack { unsigned long sp; int size; int status; };
821
822 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
823                                 struct irix_sigaltstack __user *old)
824 {
825 #ifdef DEBUG_SIG
826         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
827                current->comm, current->pid, new, old);
828 #endif
829         if (new)
830                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
831                         return -EFAULT;
832
833         if (old) {
834                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
835                         return -EFAULT;
836         }
837
838         return 0;
839 }
840
841 struct irix_procset {
842         int cmd, ltype, lid, rtype, rid;
843 };
844
845 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
846 {
847         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
848                 return -EFAULT;
849 #ifdef DEBUG_SIG
850         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
851                current->comm, current->pid,
852                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
853                sig);
854 #endif
855         return -EINVAL;
856 }