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NFSv4: Recover locks too when returning a delegation
[linux-2.6/mini2440.git] / arch / ia64 / ia32 / ia32_signal.c
blobaa891c9bc9b67ac268970391f49122f37af4b22a
1 /*
2 * IA32 Architecture-specific signal handling support.
3 *
4 * Copyright (C) 1999, 2001-2002, 2005 Hewlett-Packard Co
5 * David Mosberger-Tang <davidm@hpl.hp.com>
6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
7 * Copyright (C) 2000 VA Linux Co
8 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
9 *
10 * Derived from i386 and Alpha versions.
11 */
12
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/personality.h>
17 #include <linux/ptrace.h>
18 #include <linux/sched.h>
19 #include <linux/signal.h>
20 #include <linux/smp.h>
21 #include <linux/smp_lock.h>
22 #include <linux/stddef.h>
23 #include <linux/syscalls.h>
24 #include <linux/unistd.h>
25 #include <linux/wait.h>
26 #include <linux/compat.h>
27
28 #include <asm/intrinsics.h>
29 #include <asm/uaccess.h>
30 #include <asm/rse.h>
31 #include <asm/sigcontext.h>
32
33 #include "ia32priv.h"
34
35 #include "../kernel/sigframe.h"
36
37 #define A(__x) ((unsigned long)(__x))
38
39 #define DEBUG_SIG 0
40 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
41
42 #define __IA32_NR_sigreturn 119
43 #define __IA32_NR_rt_sigreturn 173
44
45 struct sigframe_ia32
46 {
47 int pretcode;
48 int sig;
49 struct sigcontext_ia32 sc;
50 struct _fpstate_ia32 fpstate;
51 unsigned int extramask[_COMPAT_NSIG_WORDS-1];
52 char retcode[8];
53 };
54
55 struct rt_sigframe_ia32
56 {
57 int pretcode;
58 int sig;
59 int pinfo;
60 int puc;
61 compat_siginfo_t info;
62 struct ucontext_ia32 uc;
63 struct _fpstate_ia32 fpstate;
64 char retcode[8];
65 };
66
67 int
68 copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
69 {
70 unsigned long tmp;
71 int err;
72
73 if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
74 return -EFAULT;
75
76 err = __get_user(to->si_signo, &from->si_signo);
77 err |= __get_user(to->si_errno, &from->si_errno);
78 err |= __get_user(to->si_code, &from->si_code);
79
80 if (to->si_code < 0)
81 err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
82 else {
83 switch (to->si_code >> 16) {
84 case __SI_CHLD >> 16:
85 err |= __get_user(to->si_utime, &from->si_utime);
86 err |= __get_user(to->si_stime, &from->si_stime);
87 err |= __get_user(to->si_status, &from->si_status);
88 default:
89 err |= __get_user(to->si_pid, &from->si_pid);
90 err |= __get_user(to->si_uid, &from->si_uid);
91 break;
92 case __SI_FAULT >> 16:
93 err |= __get_user(tmp, &from->si_addr);
94 to->si_addr = (void __user *) tmp;
95 break;
96 case __SI_POLL >> 16:
97 err |= __get_user(to->si_band, &from->si_band);
98 err |= __get_user(to->si_fd, &from->si_fd);
99 break;
100 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
101 case __SI_MESGQ >> 16:
102 err |= __get_user(to->si_pid, &from->si_pid);
103 err |= __get_user(to->si_uid, &from->si_uid);
104 err |= __get_user(to->si_int, &from->si_int);
105 break;
106 }
107 }
108 return err;
109 }
110
111 int
112 copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
113 {
114 unsigned int addr;
115 int err;
116
117 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
118 return -EFAULT;
119
120 /* If you change siginfo_t structure, please be sure
121 this code is fixed accordingly.
122 It should never copy any pad contained in the structure
123 to avoid security leaks, but must copy the generic
124 3 ints plus the relevant union member.
125 This routine must convert siginfo from 64bit to 32bit as well
126 at the same time. */
127 err = __put_user(from->si_signo, &to->si_signo);
128 err |= __put_user(from->si_errno, &to->si_errno);
129 err |= __put_user((short)from->si_code, &to->si_code);
130 if (from->si_code < 0)
131 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
132 else {
133 switch (from->si_code >> 16) {
134 case __SI_CHLD >> 16:
135 err |= __put_user(from->si_utime, &to->si_utime);
136 err |= __put_user(from->si_stime, &to->si_stime);
137 err |= __put_user(from->si_status, &to->si_status);
138 default:
139 err |= __put_user(from->si_pid, &to->si_pid);
140 err |= __put_user(from->si_uid, &to->si_uid);
141 break;
142 case __SI_FAULT >> 16:
143 /* avoid type-checking warnings by copying _pad[0] in lieu of si_addr... */
144 err |= __put_user(from->_sifields._pad[0], &to->si_addr);
145 break;
146 case __SI_POLL >> 16:
147 err |= __put_user(from->si_band, &to->si_band);
148 err |= __put_user(from->si_fd, &to->si_fd);
149 break;
150 case __SI_TIMER >> 16:
151 err |= __put_user(from->si_tid, &to->si_tid);
152 err |= __put_user(from->si_overrun, &to->si_overrun);
153 addr = (unsigned long) from->si_ptr;
154 err |= __put_user(addr, &to->si_ptr);
155 break;
156 case __SI_RT >> 16: /* Not generated by the kernel as of now. */
157 case __SI_MESGQ >> 16:
158 err |= __put_user(from->si_uid, &to->si_uid);
159 err |= __put_user(from->si_pid, &to->si_pid);
160 addr = (unsigned long) from->si_ptr;
161 err |= __put_user(addr, &to->si_ptr);
162 break;
163 }
164 }
165 return err;
166 }
167
168
169 /*
170 * SAVE and RESTORE of ia32 fpstate info, from ia64 current state
171 * Used in exception handler to pass the fpstate to the user, and restore
172 * the fpstate while returning from the exception handler.
173 *
174 * fpstate info and their mapping to IA64 regs:
175 * fpstate REG(BITS) Attribute Comments
176 * cw ar.fcr(0:12) with bits 7 and 6 not used
177 * sw ar.fsr(0:15)
178 * tag ar.fsr(16:31) with odd numbered bits not used
179 * (read returns 0, writes ignored)
180 * ipoff ar.fir(0:31)
181 * cssel ar.fir(32:47)
182 * dataoff ar.fdr(0:31)
183 * datasel ar.fdr(32:47)
184 *
185 * _st[(0+TOS)%8] f8
186 * _st[(1+TOS)%8] f9
187 * _st[(2+TOS)%8] f10
188 * _st[(3+TOS)%8] f11 (f8..f11 from ptregs)
189 * : : : (f12..f15 from live reg)
190 * : : :
191 * _st[(7+TOS)%8] f15 TOS=sw.top(bits11:13)
192 *
193 * status Same as sw RO
194 * magic 0 as X86_FXSR_MAGIC in ia32
195 * mxcsr Bits(7:15)=ar.fcr(39:47)
196 * Bits(0:5) =ar.fsr(32:37) with bit 6 reserved
197 * _xmm[0..7] f16..f31 (live registers)
198 * with _xmm[0]
199 * Bit(64:127)=f17(0:63)
200 * Bit(0:63)=f16(0:63)
201 * All other fields unused...
202 */
203
204 static int
205 save_ia32_fpstate_live (struct _fpstate_ia32 __user *save)
206 {
207 struct task_struct *tsk = current;
208 struct pt_regs *ptp;
209 struct _fpreg_ia32 *fpregp;
210 char buf[32];
211 unsigned long fsr, fcr, fir, fdr;
212 unsigned long new_fsr;
213 unsigned long num128[2];
214 unsigned long mxcsr=0;
215 int fp_tos, fr8_st_map;
216
217 if (!access_ok(VERIFY_WRITE, save, sizeof(*save)))
218 return -EFAULT;
219
220 /* Read in fsr, fcr, fir, fdr and copy onto fpstate */
221 fsr = ia64_getreg(_IA64_REG_AR_FSR);
222 fcr = ia64_getreg(_IA64_REG_AR_FCR);
223 fir = ia64_getreg(_IA64_REG_AR_FIR);
224 fdr = ia64_getreg(_IA64_REG_AR_FDR);
225
226 /*
227 * We need to clear the exception state before calling the signal handler. Clear
228 * the bits 15, bits 0-7 in fp status word. Similar to the functionality of fnclex
229 * instruction.
230 */
231 new_fsr = fsr & ~0x80ff;
232 ia64_setreg(_IA64_REG_AR_FSR, new_fsr);
233
234 __put_user(fcr & 0xffff, &save->cw);
235 __put_user(fsr & 0xffff, &save->sw);
236 __put_user((fsr>>16) & 0xffff, &save->tag);
237 __put_user(fir, &save->ipoff);
238 __put_user((fir>>32) & 0xffff, &save->cssel);
239 __put_user(fdr, &save->dataoff);
240 __put_user((fdr>>32) & 0xffff, &save->datasel);
241 __put_user(fsr & 0xffff, &save->status);
242
243 mxcsr = ((fcr>>32) & 0xff80) | ((fsr>>32) & 0x3f);
244 __put_user(mxcsr & 0xffff, &save->mxcsr);
245 __put_user( 0, &save->magic); //#define X86_FXSR_MAGIC 0x0000
246
247 /*
248 * save f8..f11 from pt_regs
249 * save f12..f15 from live register set
250 */
251 /*
252 * Find the location where f8 has to go in fp reg stack. This depends on
253 * TOP(11:13) field of sw. Other f reg continue sequentially from where f8 maps
254 * to.
255 */
256 fp_tos = (fsr>>11)&0x7;
257 fr8_st_map = (8-fp_tos)&0x7;
258 ptp = ia64_task_regs(tsk);
259 fpregp = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15);
260 ia64f2ia32f(fpregp, &ptp->f8);
261 copy_to_user(&save->_st[(0+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
262 ia64f2ia32f(fpregp, &ptp->f9);
263 copy_to_user(&save->_st[(1+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
264 ia64f2ia32f(fpregp, &ptp->f10);
265 copy_to_user(&save->_st[(2+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
266 ia64f2ia32f(fpregp, &ptp->f11);
267 copy_to_user(&save->_st[(3+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
268
269 ia64_stfe(fpregp, 12);
270 copy_to_user(&save->_st[(4+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
271 ia64_stfe(fpregp, 13);
272 copy_to_user(&save->_st[(5+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
273 ia64_stfe(fpregp, 14);
274 copy_to_user(&save->_st[(6+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
275 ia64_stfe(fpregp, 15);
276 copy_to_user(&save->_st[(7+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
277
278 ia64_stf8(&num128[0], 16);
279 ia64_stf8(&num128[1], 17);
280 copy_to_user(&save->_xmm[0], num128, sizeof(struct _xmmreg_ia32));
281
282 ia64_stf8(&num128[0], 18);
283 ia64_stf8(&num128[1], 19);
284 copy_to_user(&save->_xmm[1], num128, sizeof(struct _xmmreg_ia32));
285
286 ia64_stf8(&num128[0], 20);
287 ia64_stf8(&num128[1], 21);
288 copy_to_user(&save->_xmm[2], num128, sizeof(struct _xmmreg_ia32));
289
290 ia64_stf8(&num128[0], 22);
291 ia64_stf8(&num128[1], 23);
292 copy_to_user(&save->_xmm[3], num128, sizeof(struct _xmmreg_ia32));
293
294 ia64_stf8(&num128[0], 24);
295 ia64_stf8(&num128[1], 25);
296 copy_to_user(&save->_xmm[4], num128, sizeof(struct _xmmreg_ia32));
297
298 ia64_stf8(&num128[0], 26);
299 ia64_stf8(&num128[1], 27);
300 copy_to_user(&save->_xmm[5], num128, sizeof(struct _xmmreg_ia32));
301
302 ia64_stf8(&num128[0], 28);
303 ia64_stf8(&num128[1], 29);
304 copy_to_user(&save->_xmm[6], num128, sizeof(struct _xmmreg_ia32));
305
306 ia64_stf8(&num128[0], 30);
307 ia64_stf8(&num128[1], 31);
308 copy_to_user(&save->_xmm[7], num128, sizeof(struct _xmmreg_ia32));
309 return 0;
310 }
311
312 static int
313 restore_ia32_fpstate_live (struct _fpstate_ia32 __user *save)
314 {
315 struct task_struct *tsk = current;
316 struct pt_regs *ptp;
317 unsigned int lo, hi;
318 unsigned long num128[2];
319 unsigned long num64, mxcsr;
320 struct _fpreg_ia32 *fpregp;
321 char buf[32];
322 unsigned long fsr, fcr, fir, fdr;
323 int fp_tos, fr8_st_map;
324
325 if (!access_ok(VERIFY_READ, save, sizeof(*save)))
326 return(-EFAULT);
327
328 /*
329 * Updating fsr, fcr, fir, fdr.
330 * Just a bit more complicated than save.
331 * - Need to make sure that we don't write any value other than the
332 * specific fpstate info
333 * - Need to make sure that the untouched part of frs, fdr, fir, fcr
334 * should remain same while writing.
335 * So, we do a read, change specific fields and write.
336 */
337 fsr = ia64_getreg(_IA64_REG_AR_FSR);
338 fcr = ia64_getreg(_IA64_REG_AR_FCR);
339 fir = ia64_getreg(_IA64_REG_AR_FIR);
340 fdr = ia64_getreg(_IA64_REG_AR_FDR);
341
342 __get_user(mxcsr, (unsigned int __user *)&save->mxcsr);
343 /* setting bits 0..5 8..12 with cw and 39..47 from mxcsr */
344 __get_user(lo, (unsigned int __user *)&save->cw);
345 num64 = mxcsr & 0xff10;
346 num64 = (num64 << 32) | (lo & 0x1f3f);
347 fcr = (fcr & (~0xff1000001f3fUL)) | num64;
348
349 /* setting bits 0..31 with sw and tag and 32..37 from mxcsr */
350 __get_user(lo, (unsigned int __user *)&save->sw);
351 /* set bits 15,7 (fsw.b, fsw.es) to reflect the current error status */
352 if ( !(lo & 0x7f) )
353 lo &= (~0x8080);
354 __get_user(hi, (unsigned int __user *)&save->tag);
355 num64 = mxcsr & 0x3f;
356 num64 = (num64 << 16) | (hi & 0xffff);
357 num64 = (num64 << 16) | (lo & 0xffff);
358 fsr = (fsr & (~0x3fffffffffUL)) | num64;
359
360 /* setting bits 0..47 with cssel and ipoff */
361 __get_user(lo, (unsigned int __user *)&save->ipoff);
362 __get_user(hi, (unsigned int __user *)&save->cssel);
363 num64 = hi & 0xffff;
364 num64 = (num64 << 32) | lo;
365 fir = (fir & (~0xffffffffffffUL)) | num64;
366
367 /* setting bits 0..47 with datasel and dataoff */
368 __get_user(lo, (unsigned int __user *)&save->dataoff);
369 __get_user(hi, (unsigned int __user *)&save->datasel);
370 num64 = hi & 0xffff;
371 num64 = (num64 << 32) | lo;
372 fdr = (fdr & (~0xffffffffffffUL)) | num64;
373
374 ia64_setreg(_IA64_REG_AR_FSR, fsr);
375 ia64_setreg(_IA64_REG_AR_FCR, fcr);
376 ia64_setreg(_IA64_REG_AR_FIR, fir);
377 ia64_setreg(_IA64_REG_AR_FDR, fdr);
378
379 /*
380 * restore f8..f11 onto pt_regs
381 * restore f12..f15 onto live registers
382 */
383 /*
384 * Find the location where f8 has to go in fp reg stack. This depends on
385 * TOP(11:13) field of sw. Other f reg continue sequentially from where f8 maps
386 * to.
387 */
388 fp_tos = (fsr>>11)&0x7;
389 fr8_st_map = (8-fp_tos)&0x7;
390 fpregp = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15);
391
392 ptp = ia64_task_regs(tsk);
393 copy_from_user(fpregp, &save->_st[(0+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
394 ia32f2ia64f(&ptp->f8, fpregp);
395 copy_from_user(fpregp, &save->_st[(1+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
396 ia32f2ia64f(&ptp->f9, fpregp);
397 copy_from_user(fpregp, &save->_st[(2+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
398 ia32f2ia64f(&ptp->f10, fpregp);
399 copy_from_user(fpregp, &save->_st[(3+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
400 ia32f2ia64f(&ptp->f11, fpregp);
401
402 copy_from_user(fpregp, &save->_st[(4+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
403 ia64_ldfe(12, fpregp);
404 copy_from_user(fpregp, &save->_st[(5+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
405 ia64_ldfe(13, fpregp);
406 copy_from_user(fpregp, &save->_st[(6+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
407 ia64_ldfe(14, fpregp);
408 copy_from_user(fpregp, &save->_st[(7+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
409 ia64_ldfe(15, fpregp);
410
411 copy_from_user(num128, &save->_xmm[0], sizeof(struct _xmmreg_ia32));
412 ia64_ldf8(16, &num128[0]);
413 ia64_ldf8(17, &num128[1]);
414
415 copy_from_user(num128, &save->_xmm[1], sizeof(struct _xmmreg_ia32));
416 ia64_ldf8(18, &num128[0]);
417 ia64_ldf8(19, &num128[1]);
418
419 copy_from_user(num128, &save->_xmm[2], sizeof(struct _xmmreg_ia32));
420 ia64_ldf8(20, &num128[0]);
421 ia64_ldf8(21, &num128[1]);
422
423 copy_from_user(num128, &save->_xmm[3], sizeof(struct _xmmreg_ia32));
424 ia64_ldf8(22, &num128[0]);
425 ia64_ldf8(23, &num128[1]);
426
427 copy_from_user(num128, &save->_xmm[4], sizeof(struct _xmmreg_ia32));
428 ia64_ldf8(24, &num128[0]);
429 ia64_ldf8(25, &num128[1]);
430
431 copy_from_user(num128, &save->_xmm[5], sizeof(struct _xmmreg_ia32));
432 ia64_ldf8(26, &num128[0]);
433 ia64_ldf8(27, &num128[1]);
434
435 copy_from_user(num128, &save->_xmm[6], sizeof(struct _xmmreg_ia32));
436 ia64_ldf8(28, &num128[0]);
437 ia64_ldf8(29, &num128[1]);
438
439 copy_from_user(num128, &save->_xmm[7], sizeof(struct _xmmreg_ia32));
440 ia64_ldf8(30, &num128[0]);
441 ia64_ldf8(31, &num128[1]);
442 return 0;
443 }
444
445 static inline void
446 sigact_set_handler (struct k_sigaction *sa, unsigned int handler, unsigned int restorer)
447 {
448 if (handler + 1 <= 2)
449 /* SIG_DFL, SIG_IGN, or SIG_ERR: must sign-extend to 64-bits */
450 sa->sa.sa_handler = (__sighandler_t) A((int) handler);
451 else
452 sa->sa.sa_handler = (__sighandler_t) (((unsigned long) restorer << 32) | handler);
453 }
454
455 long
456 __ia32_rt_sigsuspend (compat_sigset_t *sset, unsigned int sigsetsize, struct sigscratch *scr)
457 {
458 extern long ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall);
459 sigset_t oldset, set;
460
461 scr->scratch_unat = 0; /* avoid leaking kernel bits to user level */
462 memset(&set, 0, sizeof(set));
463
464 memcpy(&set.sig, &sset->sig, sigsetsize);
465
466 sigdelsetmask(&set, ~_BLOCKABLE);
467
468 spin_lock_irq(&current->sighand->siglock);
469 {
470 oldset = current->blocked;
471 current->blocked = set;
472 recalc_sigpending();
473 }
474 spin_unlock_irq(&current->sighand->siglock);
475
476 /*
477 * The return below usually returns to the signal handler. We need to pre-set the
478 * correct error code here to ensure that the right values get saved in sigcontext
479 * by ia64_do_signal.
480 */
481 scr->pt.r8 = -EINTR;
482 while (1) {
483 current->state = TASK_INTERRUPTIBLE;
484 schedule();
485 if (ia64_do_signal(&oldset, scr, 1))
486 return -EINTR;
487 }
488 }
489
490 asmlinkage long
491 ia32_rt_sigsuspend (compat_sigset_t __user *uset, unsigned int sigsetsize, struct sigscratch *scr)
492 {
493 compat_sigset_t set;
494
495 if (sigsetsize > sizeof(compat_sigset_t))
496 return -EINVAL;
497
498 if (copy_from_user(&set.sig, &uset->sig, sigsetsize))
499 return -EFAULT;
500
501 return __ia32_rt_sigsuspend(&set, sigsetsize, scr);
502 }
503
504 asmlinkage long
505 ia32_sigsuspend (unsigned int mask, struct sigscratch *scr)
506 {
507 return __ia32_rt_sigsuspend((compat_sigset_t *) &mask, sizeof(mask), scr);
508 }
509
510 asmlinkage long
511 sys32_signal (int sig, unsigned int handler)
512 {
513 struct k_sigaction new_sa, old_sa;
514 int ret;
515
516 sigact_set_handler(&new_sa, handler, 0);
517 new_sa.sa.sa_flags = SA_ONESHOT | SA_NOMASK;
518
519 ret = do_sigaction(sig, &new_sa, &old_sa);
520
521 return ret ? ret : IA32_SA_HANDLER(&old_sa);
522 }
523
524 asmlinkage long
525 sys32_rt_sigaction (int sig, struct sigaction32 __user *act,
526 struct sigaction32 __user *oact, unsigned int sigsetsize)
527 {
528 struct k_sigaction new_ka, old_ka;
529 unsigned int handler, restorer;
530 int ret;
531
532 /* XXX: Don't preclude handling different sized sigset_t's. */
533 if (sigsetsize != sizeof(compat_sigset_t))
534 return -EINVAL;
535
536 if (act) {
537 ret = get_user(handler, &act->sa_handler);
538 ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
539 ret |= get_user(restorer, &act->sa_restorer);
540 ret |= copy_from_user(&new_ka.sa.sa_mask, &act->sa_mask, sizeof(compat_sigset_t));
541 if (ret)
542 return -EFAULT;
543
544 sigact_set_handler(&new_ka, handler, restorer);
545 }
546
547 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
548
549 if (!ret && oact) {
550 ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler);
551 ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
552 ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer);
553 ret |= copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask, sizeof(compat_sigset_t));
554 }
555 return ret;
556 }
557
558
559 asmlinkage long
560 sys32_rt_sigprocmask (int how, compat_sigset_t __user *set, compat_sigset_t __user *oset,
561 unsigned int sigsetsize)
562 {
563 mm_segment_t old_fs = get_fs();
564 sigset_t s;
565 long ret;
566
567 if (sigsetsize > sizeof(s))
568 return -EINVAL;
569
570 if (set) {
571 memset(&s, 0, sizeof(s));
572 if (copy_from_user(&s.sig, set, sigsetsize))
573 return -EFAULT;
574 }
575 set_fs(KERNEL_DS);
576 ret = sys_rt_sigprocmask(how,
577 set ? (sigset_t __user *) &s : NULL,
578 oset ? (sigset_t __user *) &s : NULL, sizeof(s));
579 set_fs(old_fs);
580 if (ret)
581 return ret;
582 if (oset) {
583 if (copy_to_user(oset, &s.sig, sigsetsize))
584 return -EFAULT;
585 }
586 return 0;
587 }
588
589 asmlinkage long
590 sys32_rt_sigqueueinfo (int pid, int sig, compat_siginfo_t __user *uinfo)
591 {
592 mm_segment_t old_fs = get_fs();
593 siginfo_t info;
594 int ret;
595
596 if (copy_siginfo_from_user32(&info, uinfo))
597 return -EFAULT;
598 set_fs(KERNEL_DS);
599 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
600 set_fs(old_fs);
601 return ret;
602 }
603
604 asmlinkage long
605 sys32_sigaction (int sig, struct old_sigaction32 __user *act, struct old_sigaction32 __user *oact)
606 {
607 struct k_sigaction new_ka, old_ka;
608 unsigned int handler, restorer;
609 int ret;
610
611 if (act) {
612 compat_old_sigset_t mask;
613
614 ret = get_user(handler, &act->sa_handler);
615 ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
616 ret |= get_user(restorer, &act->sa_restorer);
617 ret |= get_user(mask, &act->sa_mask);
618 if (ret)
619 return ret;
620
621 sigact_set_handler(&new_ka, handler, restorer);
622 siginitset(&new_ka.sa.sa_mask, mask);
623 }
624
625 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
626
627 if (!ret && oact) {
628 ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler);
629 ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
630 ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer);
631 ret |= put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
632 }
633
634 return ret;
635 }
636
637 static int
638 setup_sigcontext_ia32 (struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate,
639 struct pt_regs *regs, unsigned long mask)
640 {
641 int err = 0;
642 unsigned long flag;
643
644 if (!access_ok(VERIFY_WRITE, sc, sizeof(*sc)))
645 return -EFAULT;
646
647 err |= __put_user((regs->r16 >> 32) & 0xffff, (unsigned int __user *)&sc->fs);
648 err |= __put_user((regs->r16 >> 48) & 0xffff, (unsigned int __user *)&sc->gs);
649 err |= __put_user((regs->r16 >> 16) & 0xffff, (unsigned int __user *)&sc->es);
650 err |= __put_user(regs->r16 & 0xffff, (unsigned int __user *)&sc->ds);
651 err |= __put_user(regs->r15, &sc->edi);
652 err |= __put_user(regs->r14, &sc->esi);
653 err |= __put_user(regs->r13, &sc->ebp);
654 err |= __put_user(regs->r12, &sc->esp);
655 err |= __put_user(regs->r11, &sc->ebx);
656 err |= __put_user(regs->r10, &sc->edx);
657 err |= __put_user(regs->r9, &sc->ecx);
658 err |= __put_user(regs->r8, &sc->eax);
659 #if 0
660 err |= __put_user(current->tss.trap_no, &sc->trapno);
661 err |= __put_user(current->tss.error_code, &sc->err);
662 #endif
663 err |= __put_user(regs->cr_iip, &sc->eip);
664 err |= __put_user(regs->r17 & 0xffff, (unsigned int __user *)&sc->cs);
665 /*
666 * `eflags' is in an ar register for this context
667 */
668 flag = ia64_getreg(_IA64_REG_AR_EFLAG);
669 err |= __put_user((unsigned int)flag, &sc->eflags);
670 err |= __put_user(regs->r12, &sc->esp_at_signal);
671 err |= __put_user((regs->r17 >> 16) & 0xffff, (unsigned int __user *)&sc->ss);
672
673 if ( save_ia32_fpstate_live(fpstate) < 0 )
674 err = -EFAULT;
675 else
676 err |= __put_user((u32)(u64)fpstate, &sc->fpstate);
677
678 #if 0
679 tmp = save_i387(fpstate);
680 if (tmp < 0)
681 err = 1;
682 else
683 err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
684
685 /* non-iBCS2 extensions.. */
686 #endif
687 err |= __put_user(mask, &sc->oldmask);
688 #if 0
689 err |= __put_user(current->tss.cr2, &sc->cr2);
690 #endif
691 return err;
692 }
693
694 static int
695 restore_sigcontext_ia32 (struct pt_regs *regs, struct sigcontext_ia32 __user *sc, int *peax)
696 {
697 unsigned int err = 0;
698
699 /* Always make any pending restarted system calls return -EINTR */
700 current_thread_info()->restart_block.fn = do_no_restart_syscall;
701
702 if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
703 return(-EFAULT);
704
705 #define COPY(ia64x, ia32x) err |= __get_user(regs->ia64x, &sc->ia32x)
706
707 #define copyseg_gs(tmp) (regs->r16 |= (unsigned long) (tmp) << 48)
708 #define copyseg_fs(tmp) (regs->r16 |= (unsigned long) (tmp) << 32)
709 #define copyseg_cs(tmp) (regs->r17 |= tmp)
710 #define copyseg_ss(tmp) (regs->r17 |= (unsigned long) (tmp) << 16)
711 #define copyseg_es(tmp) (regs->r16 |= (unsigned long) (tmp) << 16)
712 #define copyseg_ds(tmp) (regs->r16 |= tmp)
713
714 #define COPY_SEG(seg) \
715 { \
716 unsigned short tmp; \
717 err |= __get_user(tmp, &sc->seg); \
718 copyseg_##seg(tmp); \
719 }
720 #define COPY_SEG_STRICT(seg) \
721 { \
722 unsigned short tmp; \
723 err |= __get_user(tmp, &sc->seg); \
724 copyseg_##seg(tmp|3); \
725 }
726
727 /* To make COPY_SEGs easier, we zero r16, r17 */
728 regs->r16 = 0;
729 regs->r17 = 0;
730
731 COPY_SEG(gs);
732 COPY_SEG(fs);
733 COPY_SEG(es);
734 COPY_SEG(ds);
735 COPY(r15, edi);
736 COPY(r14, esi);
737 COPY(r13, ebp);
738 COPY(r12, esp);
739 COPY(r11, ebx);
740 COPY(r10, edx);
741 COPY(r9, ecx);
742 COPY(cr_iip, eip);
743 COPY_SEG_STRICT(cs);
744 COPY_SEG_STRICT(ss);
745 ia32_load_segment_descriptors(current);
746 {
747 unsigned int tmpflags;
748 unsigned long flag;
749
750 /*
751 * IA32 `eflags' is not part of `pt_regs', it's in an ar register which
752 * is part of the thread context. Fortunately, we are executing in the
753 * IA32 process's context.
754 */
755 err |= __get_user(tmpflags, &sc->eflags);
756 flag = ia64_getreg(_IA64_REG_AR_EFLAG);
757 flag &= ~0x40DD5;
758 flag |= (tmpflags & 0x40DD5);
759 ia64_setreg(_IA64_REG_AR_EFLAG, flag);
760
761 regs->r1 = -1; /* disable syscall checks, r1 is orig_eax */
762 }
763
764 {
765 struct _fpstate_ia32 __user *buf = NULL;
766 u32 fpstate_ptr;
767 err |= get_user(fpstate_ptr, &(sc->fpstate));
768 buf = compat_ptr(fpstate_ptr);
769 if (buf) {
770 err |= restore_ia32_fpstate_live(buf);
771 }
772 }
773
774 #if 0
775 {
776 struct _fpstate * buf;
777 err |= __get_user(buf, &sc->fpstate);
778 if (buf) {
779 if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
780 goto badframe;
781 err |= restore_i387(buf);
782 }
783 }
784 #endif
785
786 err |= __get_user(*peax, &sc->eax);
787 return err;
788
789 #if 0
790 badframe:
791 return 1;
792 #endif
793 }
794
795 /*
796 * Determine which stack to use..
797 */
798 static inline void __user *
799 get_sigframe (struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
800 {
801 unsigned long esp;
802
803 /* Default to using normal stack (truncate off sign-extension of bit 31: */
804 esp = (unsigned int) regs->r12;
805
806 /* This is the X/Open sanctioned signal stack switching. */
807 if (ka->sa.sa_flags & SA_ONSTACK) {
808 if (!on_sig_stack(esp))
809 esp = current->sas_ss_sp + current->sas_ss_size;
810 }
811 /* Legacy stack switching not supported */
812
813 return (void __user *)((esp - frame_size) & -8ul);
814 }
815
816 static int
817 setup_frame_ia32 (int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs * regs)
818 {
819 struct exec_domain *ed = current_thread_info()->exec_domain;
820 struct sigframe_ia32 __user *frame;
821 int err = 0;
822
823 frame = get_sigframe(ka, regs, sizeof(*frame));
824
825 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
826 goto give_sigsegv;
827
828 err |= __put_user((ed && ed->signal_invmap && sig < 32
829 ? (int)(ed->signal_invmap[sig]) : sig), &frame->sig);
830
831 err |= setup_sigcontext_ia32(&frame->sc, &frame->fpstate, regs, set->sig[0]);
832
833 if (_COMPAT_NSIG_WORDS > 1)
834 err |= __copy_to_user(frame->extramask, (char *) &set->sig + 4,
835 sizeof(frame->extramask));
836
837 /* Set up to return from userspace. If provided, use a stub
838 already in userspace. */
839 if (ka->sa.sa_flags & SA_RESTORER) {
840 unsigned int restorer = IA32_SA_RESTORER(ka);
841 err |= __put_user(restorer, &frame->pretcode);
842 } else {
843 /* Pointing to restorer in ia32 gate page */
844 err |= __put_user(IA32_GATE_OFFSET, &frame->pretcode);
845 }
846
847 /* This is popl %eax ; movl $,%eax ; int $0x80
848 * and there for historical reasons only.
849 * See arch/i386/kernel/signal.c
850 */
851
852 err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
853 err |= __put_user(__IA32_NR_sigreturn, (int __user *)(frame->retcode+2));
854 err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
855
856 if (err)
857 goto give_sigsegv;
858
859 /* Set up registers for signal handler */
860 regs->r12 = (unsigned long) frame;
861 regs->cr_iip = IA32_SA_HANDLER(ka);
862
863 set_fs(USER_DS);
864
865 #if 0
866 regs->eflags &= ~TF_MASK;
867 #endif
868
869 #if 0
870 printk("SIG deliver (%s:%d): sig=%d sp=%p pc=%lx ra=%x\n",
871 current->comm, current->pid, sig, (void *) frame, regs->cr_iip, frame->pretcode);
872 #endif
873
874 return 1;
875
876 give_sigsegv:
877 force_sigsegv(sig, current);
878 return 0;
879 }
880
881 static int
882 setup_rt_frame_ia32 (int sig, struct k_sigaction *ka, siginfo_t *info,
883 sigset_t *set, struct pt_regs * regs)
884 {
885 struct exec_domain *ed = current_thread_info()->exec_domain;
886 compat_uptr_t pinfo, puc;
887 struct rt_sigframe_ia32 __user *frame;
888 int err = 0;
889
890 frame = get_sigframe(ka, regs, sizeof(*frame));
891
892 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
893 goto give_sigsegv;
894
895 err |= __put_user((ed && ed->signal_invmap
896 && sig < 32 ? ed->signal_invmap[sig] : sig), &frame->sig);
897
898 pinfo = (long __user) &frame->info;
899 puc = (long __user) &frame->uc;
900 err |= __put_user(pinfo, &frame->pinfo);
901 err |= __put_user(puc, &frame->puc);
902 err |= copy_siginfo_to_user32(&frame->info, info);
903
904 /* Create the ucontext. */
905 err |= __put_user(0, &frame->uc.uc_flags);
906 err |= __put_user(0, &frame->uc.uc_link);
907 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
908 err |= __put_user(sas_ss_flags(regs->r12), &frame->uc.uc_stack.ss_flags);
909 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
910 err |= setup_sigcontext_ia32(&frame->uc.uc_mcontext, &frame->fpstate, regs, set->sig[0]);
911 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
912 if (err)
913 goto give_sigsegv;
914
915 /* Set up to return from userspace. If provided, use a stub
916 already in userspace. */
917 if (ka->sa.sa_flags & SA_RESTORER) {
918 unsigned int restorer = IA32_SA_RESTORER(ka);
919 err |= __put_user(restorer, &frame->pretcode);
920 } else {
921 /* Pointing to rt_restorer in ia32 gate page */
922 err |= __put_user(IA32_GATE_OFFSET + 8, &frame->pretcode);
923 }
924
925 /* This is movl $,%eax ; int $0x80
926 * and there for historical reasons only.
927 * See arch/i386/kernel/signal.c
928 */
929
930 err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
931 err |= __put_user(__IA32_NR_rt_sigreturn, (int __user *)(frame->retcode+1));
932 err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
933
934 if (err)
935 goto give_sigsegv;
936
937 /* Set up registers for signal handler */
938 regs->r12 = (unsigned long) frame;
939 regs->cr_iip = IA32_SA_HANDLER(ka);
940
941 set_fs(USER_DS);
942
943 #if 0
944 regs->eflags &= ~TF_MASK;
945 #endif
946
947 #if 0
948 printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%x\n",
949 current->comm, current->pid, (void *) frame, regs->cr_iip, frame->pretcode);
950 #endif
951
952 return 1;
953
954 give_sigsegv:
955 force_sigsegv(sig, current);
956 return 0;
957 }
958
959 int
960 ia32_setup_frame1 (int sig, struct k_sigaction *ka, siginfo_t *info,
961 sigset_t *set, struct pt_regs *regs)
962 {
963 /* Set up the stack frame */
964 if (ka->sa.sa_flags & SA_SIGINFO)
965 return setup_rt_frame_ia32(sig, ka, info, set, regs);
966 else
967 return setup_frame_ia32(sig, ka, set, regs);
968 }
969
970 asmlinkage long
971 sys32_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4, int arg5,
972 int arg6, int arg7, struct pt_regs regs)
973 {
974 unsigned long esp = (unsigned int) regs.r12;
975 struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(esp - 8);
976 sigset_t set;
977 int eax;
978
979 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
980 goto badframe;
981
982 if (__get_user(set.sig[0], &frame->sc.oldmask)
983 || (_COMPAT_NSIG_WORDS > 1 && __copy_from_user((char *) &set.sig + 4, &frame->extramask,
984 sizeof(frame->extramask))))
985 goto badframe;
986
987 sigdelsetmask(&set, ~_BLOCKABLE);
988 spin_lock_irq(&current->sighand->siglock);
989 current->blocked = set;
990 recalc_sigpending();
991 spin_unlock_irq(&current->sighand->siglock);
992
993 if (restore_sigcontext_ia32(&regs, &frame->sc, &eax))
994 goto badframe;
995 return eax;
996
997 badframe:
998 force_sig(SIGSEGV, current);
999 return 0;
1000 }
1001
1002 asmlinkage long
1003 sys32_rt_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4,
1004 int arg5, int arg6, int arg7, struct pt_regs regs)
1005 {
1006 unsigned long esp = (unsigned int) regs.r12;
1007 struct rt_sigframe_ia32 __user *frame = (struct rt_sigframe_ia32 __user *)(esp - 4);
1008 sigset_t set;
1009 int eax;
1010
1011 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
1012 goto badframe;
1013 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
1014 goto badframe;
1015
1016 sigdelsetmask(&set, ~_BLOCKABLE);
1017 spin_lock_irq(&current->sighand->siglock);
1018 current->blocked = set;
1019 recalc_sigpending();
1020 spin_unlock_irq(&current->sighand->siglock);
1021
1022 if (restore_sigcontext_ia32(&regs, &frame->uc.uc_mcontext, &eax))
1023 goto badframe;
1024
1025 /* It is more difficult to avoid calling this function than to
1026 call it and ignore errors. */
1027 do_sigaltstack((stack_t __user *) &frame->uc.uc_stack, NULL, esp);
1028
1029 return eax;
1030
1031 badframe:
1032 force_sig(SIGSEGV, current);
1033 return 0;
1034 }
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