?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[CVE-2009-0029] sparc: Enable syscall wrappers for 64-bit
[linux-2.6/next.git] / arch / ia64 / ia32 / ia32_signal.c
blobb763ca19ef173f26a642910124cbf30f30b3ad43
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/stddef.h>
22 #include <linux/syscalls.h>
23 #include <linux/unistd.h>
24 #include <linux/wait.h>
25 #include <linux/compat.h>
26
27 #include <asm/intrinsics.h>
28 #include <asm/uaccess.h>
29 #include <asm/rse.h>
30 #include <asm/sigcontext.h>
31
32 #include "ia32priv.h"
33
34 #include "../kernel/sigframe.h"
35
36 #define A(__x) ((unsigned long)(__x))
37
38 #define DEBUG_SIG 0
39 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
40
41 #define __IA32_NR_sigreturn 119
42 #define __IA32_NR_rt_sigreturn 173
43
44 struct sigframe_ia32
45 {
46 int pretcode;
47 int sig;
48 struct sigcontext_ia32 sc;
49 struct _fpstate_ia32 fpstate;
50 unsigned int extramask[_COMPAT_NSIG_WORDS-1];
51 char retcode[8];
52 };
53
54 struct rt_sigframe_ia32
55 {
56 int pretcode;
57 int sig;
58 int pinfo;
59 int puc;
60 compat_siginfo_t info;
61 struct ucontext_ia32 uc;
62 struct _fpstate_ia32 fpstate;
63 char retcode[8];
64 };
65
66 int
67 copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
68 {
69 unsigned long tmp;
70 int err;
71
72 if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
73 return -EFAULT;
74
75 err = __get_user(to->si_signo, &from->si_signo);
76 err |= __get_user(to->si_errno, &from->si_errno);
77 err |= __get_user(to->si_code, &from->si_code);
78
79 if (to->si_code < 0)
80 err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
81 else {
82 switch (to->si_code >> 16) {
83 case __SI_CHLD >> 16:
84 err |= __get_user(to->si_utime, &from->si_utime);
85 err |= __get_user(to->si_stime, &from->si_stime);
86 err |= __get_user(to->si_status, &from->si_status);
87 default:
88 err |= __get_user(to->si_pid, &from->si_pid);
89 err |= __get_user(to->si_uid, &from->si_uid);
90 break;
91 case __SI_FAULT >> 16:
92 err |= __get_user(tmp, &from->si_addr);
93 to->si_addr = (void __user *) tmp;
94 break;
95 case __SI_POLL >> 16:
96 err |= __get_user(to->si_band, &from->si_band);
97 err |= __get_user(to->si_fd, &from->si_fd);
98 break;
99 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
100 case __SI_MESGQ >> 16:
101 err |= __get_user(to->si_pid, &from->si_pid);
102 err |= __get_user(to->si_uid, &from->si_uid);
103 err |= __get_user(to->si_int, &from->si_int);
104 break;
105 }
106 }
107 return err;
108 }
109
110 int
111 copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
112 {
113 unsigned int addr;
114 int err;
115
116 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
117 return -EFAULT;
118
119 /* If you change siginfo_t structure, please be sure
120 this code is fixed accordingly.
121 It should never copy any pad contained in the structure
122 to avoid security leaks, but must copy the generic
123 3 ints plus the relevant union member.
124 This routine must convert siginfo from 64bit to 32bit as well
125 at the same time. */
126 err = __put_user(from->si_signo, &to->si_signo);
127 err |= __put_user(from->si_errno, &to->si_errno);
128 err |= __put_user((short)from->si_code, &to->si_code);
129 if (from->si_code < 0)
130 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
131 else {
132 switch (from->si_code >> 16) {
133 case __SI_CHLD >> 16:
134 err |= __put_user(from->si_utime, &to->si_utime);
135 err |= __put_user(from->si_stime, &to->si_stime);
136 err |= __put_user(from->si_status, &to->si_status);
137 default:
138 err |= __put_user(from->si_pid, &to->si_pid);
139 err |= __put_user(from->si_uid, &to->si_uid);
140 break;
141 case __SI_FAULT >> 16:
142 /* avoid type-checking warnings by copying _pad[0] in lieu of si_addr... */
143 err |= __put_user(from->_sifields._pad[0], &to->si_addr);
144 break;
145 case __SI_POLL >> 16:
146 err |= __put_user(from->si_band, &to->si_band);
147 err |= __put_user(from->si_fd, &to->si_fd);
148 break;
149 case __SI_TIMER >> 16:
150 err |= __put_user(from->si_tid, &to->si_tid);
151 err |= __put_user(from->si_overrun, &to->si_overrun);
152 addr = (unsigned long) from->si_ptr;
153 err |= __put_user(addr, &to->si_ptr);
154 break;
155 case __SI_RT >> 16: /* Not generated by the kernel as of now. */
156 case __SI_MESGQ >> 16:
157 err |= __put_user(from->si_uid, &to->si_uid);
158 err |= __put_user(from->si_pid, &to->si_pid);
159 addr = (unsigned long) from->si_ptr;
160 err |= __put_user(addr, &to->si_ptr);
161 break;
162 }
163 }
164 return err;
165 }
166
167
168 /*
169 * SAVE and RESTORE of ia32 fpstate info, from ia64 current state
170 * Used in exception handler to pass the fpstate to the user, and restore
171 * the fpstate while returning from the exception handler.
172 *
173 * fpstate info and their mapping to IA64 regs:
174 * fpstate REG(BITS) Attribute Comments
175 * cw ar.fcr(0:12) with bits 7 and 6 not used
176 * sw ar.fsr(0:15)
177 * tag ar.fsr(16:31) with odd numbered bits not used
178 * (read returns 0, writes ignored)
179 * ipoff ar.fir(0:31)
180 * cssel ar.fir(32:47)
181 * dataoff ar.fdr(0:31)
182 * datasel ar.fdr(32:47)
183 *
184 * _st[(0+TOS)%8] f8
185 * _st[(1+TOS)%8] f9
186 * _st[(2+TOS)%8] f10
187 * _st[(3+TOS)%8] f11 (f8..f11 from ptregs)
188 * : : : (f12..f15 from live reg)
189 * : : :
190 * _st[(7+TOS)%8] f15 TOS=sw.top(bits11:13)
191 *
192 * status Same as sw RO
193 * magic 0 as X86_FXSR_MAGIC in ia32
194 * mxcsr Bits(7:15)=ar.fcr(39:47)
195 * Bits(0:5) =ar.fsr(32:37) with bit 6 reserved
196 * _xmm[0..7] f16..f31 (live registers)
197 * with _xmm[0]
198 * Bit(64:127)=f17(0:63)
199 * Bit(0:63)=f16(0:63)
200 * All other fields unused...
201 */
202
203 static int
204 save_ia32_fpstate_live (struct _fpstate_ia32 __user *save)
205 {
206 struct task_struct *tsk = current;
207 struct pt_regs *ptp;
208 struct _fpreg_ia32 *fpregp;
209 char buf[32];
210 unsigned long fsr, fcr, fir, fdr;
211 unsigned long new_fsr;
212 unsigned long num128[2];
213 unsigned long mxcsr=0;
214 int fp_tos, fr8_st_map;
215
216 if (!access_ok(VERIFY_WRITE, save, sizeof(*save)))
217 return -EFAULT;
218
219 /* Read in fsr, fcr, fir, fdr and copy onto fpstate */
220 fsr = ia64_getreg(_IA64_REG_AR_FSR);
221 fcr = ia64_getreg(_IA64_REG_AR_FCR);
222 fir = ia64_getreg(_IA64_REG_AR_FIR);
223 fdr = ia64_getreg(_IA64_REG_AR_FDR);
224
225 /*
226 * We need to clear the exception state before calling the signal handler. Clear
227 * the bits 15, bits 0-7 in fp status word. Similar to the functionality of fnclex
228 * instruction.
229 */
230 new_fsr = fsr & ~0x80ff;
231 ia64_setreg(_IA64_REG_AR_FSR, new_fsr);
232
233 __put_user(fcr & 0xffff, &save->cw);
234 __put_user(fsr & 0xffff, &save->sw);
235 __put_user((fsr>>16) & 0xffff, &save->tag);
236 __put_user(fir, &save->ipoff);
237 __put_user((fir>>32) & 0xffff, &save->cssel);
238 __put_user(fdr, &save->dataoff);
239 __put_user((fdr>>32) & 0xffff, &save->datasel);
240 __put_user(fsr & 0xffff, &save->status);
241
242 mxcsr = ((fcr>>32) & 0xff80) | ((fsr>>32) & 0x3f);
243 __put_user(mxcsr & 0xffff, &save->mxcsr);
244 __put_user( 0, &save->magic); //#define X86_FXSR_MAGIC 0x0000
245
246 /*
247 * save f8..f11 from pt_regs
248 * save f12..f15 from live register set
249 */
250 /*
251 * Find the location where f8 has to go in fp reg stack. This depends on
252 * TOP(11:13) field of sw. Other f reg continue sequentially from where f8 maps
253 * to.
254 */
255 fp_tos = (fsr>>11)&0x7;
256 fr8_st_map = (8-fp_tos)&0x7;
257 ptp = task_pt_regs(tsk);
258 fpregp = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15);
259 ia64f2ia32f(fpregp, &ptp->f8);
260 copy_to_user(&save->_st[(0+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
261 ia64f2ia32f(fpregp, &ptp->f9);
262 copy_to_user(&save->_st[(1+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
263 ia64f2ia32f(fpregp, &ptp->f10);
264 copy_to_user(&save->_st[(2+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
265 ia64f2ia32f(fpregp, &ptp->f11);
266 copy_to_user(&save->_st[(3+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
267
268 ia64_stfe(fpregp, 12);
269 copy_to_user(&save->_st[(4+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
270 ia64_stfe(fpregp, 13);
271 copy_to_user(&save->_st[(5+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
272 ia64_stfe(fpregp, 14);
273 copy_to_user(&save->_st[(6+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
274 ia64_stfe(fpregp, 15);
275 copy_to_user(&save->_st[(7+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
276
277 ia64_stf8(&num128[0], 16);
278 ia64_stf8(&num128[1], 17);
279 copy_to_user(&save->_xmm[0], num128, sizeof(struct _xmmreg_ia32));
280
281 ia64_stf8(&num128[0], 18);
282 ia64_stf8(&num128[1], 19);
283 copy_to_user(&save->_xmm[1], num128, sizeof(struct _xmmreg_ia32));
284
285 ia64_stf8(&num128[0], 20);
286 ia64_stf8(&num128[1], 21);
287 copy_to_user(&save->_xmm[2], num128, sizeof(struct _xmmreg_ia32));
288
289 ia64_stf8(&num128[0], 22);
290 ia64_stf8(&num128[1], 23);
291 copy_to_user(&save->_xmm[3], num128, sizeof(struct _xmmreg_ia32));
292
293 ia64_stf8(&num128[0], 24);
294 ia64_stf8(&num128[1], 25);
295 copy_to_user(&save->_xmm[4], num128, sizeof(struct _xmmreg_ia32));
296
297 ia64_stf8(&num128[0], 26);
298 ia64_stf8(&num128[1], 27);
299 copy_to_user(&save->_xmm[5], num128, sizeof(struct _xmmreg_ia32));
300
301 ia64_stf8(&num128[0], 28);
302 ia64_stf8(&num128[1], 29);
303 copy_to_user(&save->_xmm[6], num128, sizeof(struct _xmmreg_ia32));
304
305 ia64_stf8(&num128[0], 30);
306 ia64_stf8(&num128[1], 31);
307 copy_to_user(&save->_xmm[7], num128, sizeof(struct _xmmreg_ia32));
308 return 0;
309 }
310
311 static int
312 restore_ia32_fpstate_live (struct _fpstate_ia32 __user *save)
313 {
314 struct task_struct *tsk = current;
315 struct pt_regs *ptp;
316 unsigned int lo, hi;
317 unsigned long num128[2];
318 unsigned long num64, mxcsr;
319 struct _fpreg_ia32 *fpregp;
320 char buf[32];
321 unsigned long fsr, fcr, fir, fdr;
322 int fp_tos, fr8_st_map;
323
324 if (!access_ok(VERIFY_READ, save, sizeof(*save)))
325 return(-EFAULT);
326
327 /*
328 * Updating fsr, fcr, fir, fdr.
329 * Just a bit more complicated than save.
330 * - Need to make sure that we don't write any value other than the
331 * specific fpstate info
332 * - Need to make sure that the untouched part of frs, fdr, fir, fcr
333 * should remain same while writing.
334 * So, we do a read, change specific fields and write.
335 */
336 fsr = ia64_getreg(_IA64_REG_AR_FSR);
337 fcr = ia64_getreg(_IA64_REG_AR_FCR);
338 fir = ia64_getreg(_IA64_REG_AR_FIR);
339 fdr = ia64_getreg(_IA64_REG_AR_FDR);
340
341 __get_user(mxcsr, (unsigned int __user *)&save->mxcsr);
342 /* setting bits 0..5 8..12 with cw and 39..47 from mxcsr */
343 __get_user(lo, (unsigned int __user *)&save->cw);
344 num64 = mxcsr & 0xff10;
345 num64 = (num64 << 32) | (lo & 0x1f3f);
346 fcr = (fcr & (~0xff1000001f3fUL)) | num64;
347
348 /* setting bits 0..31 with sw and tag and 32..37 from mxcsr */
349 __get_user(lo, (unsigned int __user *)&save->sw);
350 /* set bits 15,7 (fsw.b, fsw.es) to reflect the current error status */
351 if ( !(lo & 0x7f) )
352 lo &= (~0x8080);
353 __get_user(hi, (unsigned int __user *)&save->tag);
354 num64 = mxcsr & 0x3f;
355 num64 = (num64 << 16) | (hi & 0xffff);
356 num64 = (num64 << 16) | (lo & 0xffff);
357 fsr = (fsr & (~0x3fffffffffUL)) | num64;
358
359 /* setting bits 0..47 with cssel and ipoff */
360 __get_user(lo, (unsigned int __user *)&save->ipoff);
361 __get_user(hi, (unsigned int __user *)&save->cssel);
362 num64 = hi & 0xffff;
363 num64 = (num64 << 32) | lo;
364 fir = (fir & (~0xffffffffffffUL)) | num64;
365
366 /* setting bits 0..47 with datasel and dataoff */
367 __get_user(lo, (unsigned int __user *)&save->dataoff);
368 __get_user(hi, (unsigned int __user *)&save->datasel);
369 num64 = hi & 0xffff;
370 num64 = (num64 << 32) | lo;
371 fdr = (fdr & (~0xffffffffffffUL)) | num64;
372
373 ia64_setreg(_IA64_REG_AR_FSR, fsr);
374 ia64_setreg(_IA64_REG_AR_FCR, fcr);
375 ia64_setreg(_IA64_REG_AR_FIR, fir);
376 ia64_setreg(_IA64_REG_AR_FDR, fdr);
377
378 /*
379 * restore f8..f11 onto pt_regs
380 * restore f12..f15 onto live registers
381 */
382 /*
383 * Find the location where f8 has to go in fp reg stack. This depends on
384 * TOP(11:13) field of sw. Other f reg continue sequentially from where f8 maps
385 * to.
386 */
387 fp_tos = (fsr>>11)&0x7;
388 fr8_st_map = (8-fp_tos)&0x7;
389 fpregp = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15);
390
391 ptp = task_pt_regs(tsk);
392 copy_from_user(fpregp, &save->_st[(0+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
393 ia32f2ia64f(&ptp->f8, fpregp);
394 copy_from_user(fpregp, &save->_st[(1+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
395 ia32f2ia64f(&ptp->f9, fpregp);
396 copy_from_user(fpregp, &save->_st[(2+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
397 ia32f2ia64f(&ptp->f10, fpregp);
398 copy_from_user(fpregp, &save->_st[(3+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
399 ia32f2ia64f(&ptp->f11, fpregp);
400
401 copy_from_user(fpregp, &save->_st[(4+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
402 ia64_ldfe(12, fpregp);
403 copy_from_user(fpregp, &save->_st[(5+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
404 ia64_ldfe(13, fpregp);
405 copy_from_user(fpregp, &save->_st[(6+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
406 ia64_ldfe(14, fpregp);
407 copy_from_user(fpregp, &save->_st[(7+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
408 ia64_ldfe(15, fpregp);
409
410 copy_from_user(num128, &save->_xmm[0], sizeof(struct _xmmreg_ia32));
411 ia64_ldf8(16, &num128[0]);
412 ia64_ldf8(17, &num128[1]);
413
414 copy_from_user(num128, &save->_xmm[1], sizeof(struct _xmmreg_ia32));
415 ia64_ldf8(18, &num128[0]);
416 ia64_ldf8(19, &num128[1]);
417
418 copy_from_user(num128, &save->_xmm[2], sizeof(struct _xmmreg_ia32));
419 ia64_ldf8(20, &num128[0]);
420 ia64_ldf8(21, &num128[1]);
421
422 copy_from_user(num128, &save->_xmm[3], sizeof(struct _xmmreg_ia32));
423 ia64_ldf8(22, &num128[0]);
424 ia64_ldf8(23, &num128[1]);
425
426 copy_from_user(num128, &save->_xmm[4], sizeof(struct _xmmreg_ia32));
427 ia64_ldf8(24, &num128[0]);
428 ia64_ldf8(25, &num128[1]);
429
430 copy_from_user(num128, &save->_xmm[5], sizeof(struct _xmmreg_ia32));
431 ia64_ldf8(26, &num128[0]);
432 ia64_ldf8(27, &num128[1]);
433
434 copy_from_user(num128, &save->_xmm[6], sizeof(struct _xmmreg_ia32));
435 ia64_ldf8(28, &num128[0]);
436 ia64_ldf8(29, &num128[1]);
437
438 copy_from_user(num128, &save->_xmm[7], sizeof(struct _xmmreg_ia32));
439 ia64_ldf8(30, &num128[0]);
440 ia64_ldf8(31, &num128[1]);
441 return 0;
442 }
443
444 static inline void
445 sigact_set_handler (struct k_sigaction *sa, unsigned int handler, unsigned int restorer)
446 {
447 if (handler + 1 <= 2)
448 /* SIG_DFL, SIG_IGN, or SIG_ERR: must sign-extend to 64-bits */
449 sa->sa.sa_handler = (__sighandler_t) A((int) handler);
450 else
451 sa->sa.sa_handler = (__sighandler_t) (((unsigned long) restorer << 32) | handler);
452 }
453
454 asmlinkage long
455 sys32_sigsuspend (int history0, int history1, old_sigset_t mask)
456 {
457 mask &= _BLOCKABLE;
458 spin_lock_irq(&current->sighand->siglock);
459 current->saved_sigmask = current->blocked;
460 siginitset(&current->blocked, mask);
461 recalc_sigpending();
462 spin_unlock_irq(&current->sighand->siglock);
463
464 current->state = TASK_INTERRUPTIBLE;
465 schedule();
466 set_restore_sigmask();
467 return -ERESTARTNOHAND;
468 }
469
470 asmlinkage long
471 sys32_signal (int sig, unsigned int handler)
472 {
473 struct k_sigaction new_sa, old_sa;
474 int ret;
475
476 sigact_set_handler(&new_sa, handler, 0);
477 new_sa.sa.sa_flags = SA_ONESHOT | SA_NOMASK;
478 sigemptyset(&new_sa.sa.sa_mask);
479
480 ret = do_sigaction(sig, &new_sa, &old_sa);
481
482 return ret ? ret : IA32_SA_HANDLER(&old_sa);
483 }
484
485 asmlinkage long
486 sys32_rt_sigaction (int sig, struct sigaction32 __user *act,
487 struct sigaction32 __user *oact, unsigned int sigsetsize)
488 {
489 struct k_sigaction new_ka, old_ka;
490 unsigned int handler, restorer;
491 int ret;
492
493 /* XXX: Don't preclude handling different sized sigset_t's. */
494 if (sigsetsize != sizeof(compat_sigset_t))
495 return -EINVAL;
496
497 if (act) {
498 ret = get_user(handler, &act->sa_handler);
499 ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
500 ret |= get_user(restorer, &act->sa_restorer);
501 ret |= copy_from_user(&new_ka.sa.sa_mask, &act->sa_mask, sizeof(compat_sigset_t));
502 if (ret)
503 return -EFAULT;
504
505 sigact_set_handler(&new_ka, handler, restorer);
506 }
507
508 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
509
510 if (!ret && oact) {
511 ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler);
512 ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
513 ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer);
514 ret |= copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask, sizeof(compat_sigset_t));
515 }
516 return ret;
517 }
518
519
520 asmlinkage long
521 sys32_rt_sigprocmask (int how, compat_sigset_t __user *set, compat_sigset_t __user *oset,
522 unsigned int sigsetsize)
523 {
524 mm_segment_t old_fs = get_fs();
525 sigset_t s;
526 long ret;
527
528 if (sigsetsize > sizeof(s))
529 return -EINVAL;
530
531 if (set) {
532 memset(&s, 0, sizeof(s));
533 if (copy_from_user(&s.sig, set, sigsetsize))
534 return -EFAULT;
535 }
536 set_fs(KERNEL_DS);
537 ret = sys_rt_sigprocmask(how,
538 set ? (sigset_t __user *) &s : NULL,
539 oset ? (sigset_t __user *) &s : NULL, sizeof(s));
540 set_fs(old_fs);
541 if (ret)
542 return ret;
543 if (oset) {
544 if (copy_to_user(oset, &s.sig, sigsetsize))
545 return -EFAULT;
546 }
547 return 0;
548 }
549
550 asmlinkage long
551 sys32_rt_sigqueueinfo (int pid, int sig, compat_siginfo_t __user *uinfo)
552 {
553 mm_segment_t old_fs = get_fs();
554 siginfo_t info;
555 int ret;
556
557 if (copy_siginfo_from_user32(&info, uinfo))
558 return -EFAULT;
559 set_fs(KERNEL_DS);
560 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
561 set_fs(old_fs);
562 return ret;
563 }
564
565 asmlinkage long
566 sys32_sigaction (int sig, struct old_sigaction32 __user *act, struct old_sigaction32 __user *oact)
567 {
568 struct k_sigaction new_ka, old_ka;
569 unsigned int handler, restorer;
570 int ret;
571
572 if (act) {
573 compat_old_sigset_t mask;
574
575 ret = get_user(handler, &act->sa_handler);
576 ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
577 ret |= get_user(restorer, &act->sa_restorer);
578 ret |= get_user(mask, &act->sa_mask);
579 if (ret)
580 return ret;
581
582 sigact_set_handler(&new_ka, handler, restorer);
583 siginitset(&new_ka.sa.sa_mask, mask);
584 }
585
586 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
587
588 if (!ret && oact) {
589 ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler);
590 ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
591 ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer);
592 ret |= put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
593 }
594
595 return ret;
596 }
597
598 static int
599 setup_sigcontext_ia32 (struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate,
600 struct pt_regs *regs, unsigned long mask)
601 {
602 int err = 0;
603 unsigned long flag;
604
605 if (!access_ok(VERIFY_WRITE, sc, sizeof(*sc)))
606 return -EFAULT;
607
608 err |= __put_user((regs->r16 >> 32) & 0xffff, (unsigned int __user *)&sc->fs);
609 err |= __put_user((regs->r16 >> 48) & 0xffff, (unsigned int __user *)&sc->gs);
610 err |= __put_user((regs->r16 >> 16) & 0xffff, (unsigned int __user *)&sc->es);
611 err |= __put_user(regs->r16 & 0xffff, (unsigned int __user *)&sc->ds);
612 err |= __put_user(regs->r15, &sc->edi);
613 err |= __put_user(regs->r14, &sc->esi);
614 err |= __put_user(regs->r13, &sc->ebp);
615 err |= __put_user(regs->r12, &sc->esp);
616 err |= __put_user(regs->r11, &sc->ebx);
617 err |= __put_user(regs->r10, &sc->edx);
618 err |= __put_user(regs->r9, &sc->ecx);
619 err |= __put_user(regs->r8, &sc->eax);
620 #if 0
621 err |= __put_user(current->tss.trap_no, &sc->trapno);
622 err |= __put_user(current->tss.error_code, &sc->err);
623 #endif
624 err |= __put_user(regs->cr_iip, &sc->eip);
625 err |= __put_user(regs->r17 & 0xffff, (unsigned int __user *)&sc->cs);
626 /*
627 * `eflags' is in an ar register for this context
628 */
629 flag = ia64_getreg(_IA64_REG_AR_EFLAG);
630 err |= __put_user((unsigned int)flag, &sc->eflags);
631 err |= __put_user(regs->r12, &sc->esp_at_signal);
632 err |= __put_user((regs->r17 >> 16) & 0xffff, (unsigned int __user *)&sc->ss);
633
634 if ( save_ia32_fpstate_live(fpstate) < 0 )
635 err = -EFAULT;
636 else
637 err |= __put_user((u32)(u64)fpstate, &sc->fpstate);
638
639 #if 0
640 tmp = save_i387(fpstate);
641 if (tmp < 0)
642 err = 1;
643 else
644 err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
645
646 /* non-iBCS2 extensions.. */
647 #endif
648 err |= __put_user(mask, &sc->oldmask);
649 #if 0
650 err |= __put_user(current->tss.cr2, &sc->cr2);
651 #endif
652 return err;
653 }
654
655 static int
656 restore_sigcontext_ia32 (struct pt_regs *regs, struct sigcontext_ia32 __user *sc, int *peax)
657 {
658 unsigned int err = 0;
659
660 /* Always make any pending restarted system calls return -EINTR */
661 current_thread_info()->restart_block.fn = do_no_restart_syscall;
662
663 if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
664 return(-EFAULT);
665
666 #define COPY(ia64x, ia32x) err |= __get_user(regs->ia64x, &sc->ia32x)
667
668 #define copyseg_gs(tmp) (regs->r16 |= (unsigned long) (tmp) << 48)
669 #define copyseg_fs(tmp) (regs->r16 |= (unsigned long) (tmp) << 32)
670 #define copyseg_cs(tmp) (regs->r17 |= tmp)
671 #define copyseg_ss(tmp) (regs->r17 |= (unsigned long) (tmp) << 16)
672 #define copyseg_es(tmp) (regs->r16 |= (unsigned long) (tmp) << 16)
673 #define copyseg_ds(tmp) (regs->r16 |= tmp)
674
675 #define COPY_SEG(seg) \
676 { \
677 unsigned short tmp; \
678 err |= __get_user(tmp, &sc->seg); \
679 copyseg_##seg(tmp); \
680 }
681 #define COPY_SEG_STRICT(seg) \
682 { \
683 unsigned short tmp; \
684 err |= __get_user(tmp, &sc->seg); \
685 copyseg_##seg(tmp|3); \
686 }
687
688 /* To make COPY_SEGs easier, we zero r16, r17 */
689 regs->r16 = 0;
690 regs->r17 = 0;
691
692 COPY_SEG(gs);
693 COPY_SEG(fs);
694 COPY_SEG(es);
695 COPY_SEG(ds);
696 COPY(r15, edi);
697 COPY(r14, esi);
698 COPY(r13, ebp);
699 COPY(r12, esp);
700 COPY(r11, ebx);
701 COPY(r10, edx);
702 COPY(r9, ecx);
703 COPY(cr_iip, eip);
704 COPY_SEG_STRICT(cs);
705 COPY_SEG_STRICT(ss);
706 ia32_load_segment_descriptors(current);
707 {
708 unsigned int tmpflags;
709 unsigned long flag;
710
711 /*
712 * IA32 `eflags' is not part of `pt_regs', it's in an ar register which
713 * is part of the thread context. Fortunately, we are executing in the
714 * IA32 process's context.
715 */
716 err |= __get_user(tmpflags, &sc->eflags);
717 flag = ia64_getreg(_IA64_REG_AR_EFLAG);
718 flag &= ~0x40DD5;
719 flag |= (tmpflags & 0x40DD5);
720 ia64_setreg(_IA64_REG_AR_EFLAG, flag);
721
722 regs->r1 = -1; /* disable syscall checks, r1 is orig_eax */
723 }
724
725 {
726 struct _fpstate_ia32 __user *buf = NULL;
727 u32 fpstate_ptr;
728 err |= get_user(fpstate_ptr, &(sc->fpstate));
729 buf = compat_ptr(fpstate_ptr);
730 if (buf) {
731 err |= restore_ia32_fpstate_live(buf);
732 }
733 }
734
735 #if 0
736 {
737 struct _fpstate * buf;
738 err |= __get_user(buf, &sc->fpstate);
739 if (buf) {
740 if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
741 goto badframe;
742 err |= restore_i387(buf);
743 }
744 }
745 #endif
746
747 err |= __get_user(*peax, &sc->eax);
748 return err;
749
750 #if 0
751 badframe:
752 return 1;
753 #endif
754 }
755
756 /*
757 * Determine which stack to use..
758 */
759 static inline void __user *
760 get_sigframe (struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
761 {
762 unsigned long esp;
763
764 /* Default to using normal stack (truncate off sign-extension of bit 31: */
765 esp = (unsigned int) regs->r12;
766
767 /* This is the X/Open sanctioned signal stack switching. */
768 if (ka->sa.sa_flags & SA_ONSTACK) {
769 int onstack = sas_ss_flags(esp);
770
771 if (onstack == 0)
772 esp = current->sas_ss_sp + current->sas_ss_size;
773 else if (onstack == SS_ONSTACK) {
774 /*
775 * If we are on the alternate signal stack and would
776 * overflow it, don't. Return an always-bogus address
777 * instead so we will die with SIGSEGV.
778 */
779 if (!likely(on_sig_stack(esp - frame_size)))
780 return (void __user *) -1L;
781 }
782 }
783 /* Legacy stack switching not supported */
784
785 esp -= frame_size;
786 /* Align the stack pointer according to the i386 ABI,
787 * i.e. so that on function entry ((sp + 4) & 15) == 0. */
788 esp = ((esp + 4) & -16ul) - 4;
789 return (void __user *) esp;
790 }
791
792 static int
793 setup_frame_ia32 (int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs * regs)
794 {
795 struct exec_domain *ed = current_thread_info()->exec_domain;
796 struct sigframe_ia32 __user *frame;
797 int err = 0;
798
799 frame = get_sigframe(ka, regs, sizeof(*frame));
800
801 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
802 goto give_sigsegv;
803
804 err |= __put_user((ed && ed->signal_invmap && sig < 32
805 ? (int)(ed->signal_invmap[sig]) : sig), &frame->sig);
806
807 err |= setup_sigcontext_ia32(&frame->sc, &frame->fpstate, regs, set->sig[0]);
808
809 if (_COMPAT_NSIG_WORDS > 1)
810 err |= __copy_to_user(frame->extramask, (char *) &set->sig + 4,
811 sizeof(frame->extramask));
812
813 /* Set up to return from userspace. If provided, use a stub
814 already in userspace. */
815 if (ka->sa.sa_flags & SA_RESTORER) {
816 unsigned int restorer = IA32_SA_RESTORER(ka);
817 err |= __put_user(restorer, &frame->pretcode);
818 } else {
819 /* Pointing to restorer in ia32 gate page */
820 err |= __put_user(IA32_GATE_OFFSET, &frame->pretcode);
821 }
822
823 /* This is popl %eax ; movl $,%eax ; int $0x80
824 * and there for historical reasons only.
825 * See arch/i386/kernel/signal.c
826 */
827
828 err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
829 err |= __put_user(__IA32_NR_sigreturn, (int __user *)(frame->retcode+2));
830 err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
831
832 if (err)
833 goto give_sigsegv;
834
835 /* Set up registers for signal handler */
836 regs->r12 = (unsigned long) frame;
837 regs->cr_iip = IA32_SA_HANDLER(ka);
838
839 set_fs(USER_DS);
840
841 #if 0
842 regs->eflags &= ~TF_MASK;
843 #endif
844
845 #if 0
846 printk("SIG deliver (%s:%d): sig=%d sp=%p pc=%lx ra=%x\n",
847 current->comm, current->pid, sig, (void *) frame, regs->cr_iip, frame->pretcode);
848 #endif
849
850 return 1;
851
852 give_sigsegv:
853 force_sigsegv(sig, current);
854 return 0;
855 }
856
857 static int
858 setup_rt_frame_ia32 (int sig, struct k_sigaction *ka, siginfo_t *info,
859 sigset_t *set, struct pt_regs * regs)
860 {
861 struct exec_domain *ed = current_thread_info()->exec_domain;
862 compat_uptr_t pinfo, puc;
863 struct rt_sigframe_ia32 __user *frame;
864 int err = 0;
865
866 frame = get_sigframe(ka, regs, sizeof(*frame));
867
868 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
869 goto give_sigsegv;
870
871 err |= __put_user((ed && ed->signal_invmap
872 && sig < 32 ? ed->signal_invmap[sig] : sig), &frame->sig);
873
874 pinfo = (long __user) &frame->info;
875 puc = (long __user) &frame->uc;
876 err |= __put_user(pinfo, &frame->pinfo);
877 err |= __put_user(puc, &frame->puc);
878 err |= copy_siginfo_to_user32(&frame->info, info);
879
880 /* Create the ucontext. */
881 err |= __put_user(0, &frame->uc.uc_flags);
882 err |= __put_user(0, &frame->uc.uc_link);
883 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
884 err |= __put_user(sas_ss_flags(regs->r12), &frame->uc.uc_stack.ss_flags);
885 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
886 err |= setup_sigcontext_ia32(&frame->uc.uc_mcontext, &frame->fpstate, regs, set->sig[0]);
887 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
888 if (err)
889 goto give_sigsegv;
890
891 /* Set up to return from userspace. If provided, use a stub
892 already in userspace. */
893 if (ka->sa.sa_flags & SA_RESTORER) {
894 unsigned int restorer = IA32_SA_RESTORER(ka);
895 err |= __put_user(restorer, &frame->pretcode);
896 } else {
897 /* Pointing to rt_restorer in ia32 gate page */
898 err |= __put_user(IA32_GATE_OFFSET + 8, &frame->pretcode);
899 }
900
901 /* This is movl $,%eax ; int $0x80
902 * and there for historical reasons only.
903 * See arch/i386/kernel/signal.c
904 */
905
906 err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
907 err |= __put_user(__IA32_NR_rt_sigreturn, (int __user *)(frame->retcode+1));
908 err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
909
910 if (err)
911 goto give_sigsegv;
912
913 /* Set up registers for signal handler */
914 regs->r12 = (unsigned long) frame;
915 regs->cr_iip = IA32_SA_HANDLER(ka);
916
917 set_fs(USER_DS);
918
919 #if 0
920 regs->eflags &= ~TF_MASK;
921 #endif
922
923 #if 0
924 printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%x\n",
925 current->comm, current->pid, (void *) frame, regs->cr_iip, frame->pretcode);
926 #endif
927
928 return 1;
929
930 give_sigsegv:
931 force_sigsegv(sig, current);
932 return 0;
933 }
934
935 int
936 ia32_setup_frame1 (int sig, struct k_sigaction *ka, siginfo_t *info,
937 sigset_t *set, struct pt_regs *regs)
938 {
939 /* Set up the stack frame */
940 if (ka->sa.sa_flags & SA_SIGINFO)
941 return setup_rt_frame_ia32(sig, ka, info, set, regs);
942 else
943 return setup_frame_ia32(sig, ka, set, regs);
944 }
945
946 asmlinkage long
947 sys32_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4, int arg5,
948 int arg6, int arg7, struct pt_regs regs)
949 {
950 unsigned long esp = (unsigned int) regs.r12;
951 struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(esp - 8);
952 sigset_t set;
953 int eax;
954
955 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
956 goto badframe;
957
958 if (__get_user(set.sig[0], &frame->sc.oldmask)
959 || (_COMPAT_NSIG_WORDS > 1 && __copy_from_user((char *) &set.sig + 4, &frame->extramask,
960 sizeof(frame->extramask))))
961 goto badframe;
962
963 sigdelsetmask(&set, ~_BLOCKABLE);
964 spin_lock_irq(&current->sighand->siglock);
965 current->blocked = set;
966 recalc_sigpending();
967 spin_unlock_irq(&current->sighand->siglock);
968
969 if (restore_sigcontext_ia32(&regs, &frame->sc, &eax))
970 goto badframe;
971 return eax;
972
973 badframe:
974 force_sig(SIGSEGV, current);
975 return 0;
976 }
977
978 asmlinkage long
979 sys32_rt_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4,
980 int arg5, int arg6, int arg7, struct pt_regs regs)
981 {
982 unsigned long esp = (unsigned int) regs.r12;
983 struct rt_sigframe_ia32 __user *frame = (struct rt_sigframe_ia32 __user *)(esp - 4);
984 sigset_t set;
985 int eax;
986
987 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
988 goto badframe;
989 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
990 goto badframe;
991
992 sigdelsetmask(&set, ~_BLOCKABLE);
993 spin_lock_irq(&current->sighand->siglock);
994 current->blocked = set;
995 recalc_sigpending();
996 spin_unlock_irq(&current->sighand->siglock);
997
998 if (restore_sigcontext_ia32(&regs, &frame->uc.uc_mcontext, &eax))
999 goto badframe;
1000
1001 /* It is more difficult to avoid calling this function than to
1002 call it and ignore errors. */
1003 do_sigaltstack((stack_t __user *) &frame->uc.uc_stack, NULL, esp);
1004
1005 return eax;
1006
1007 badframe:
1008 force_sig(SIGSEGV, current);
1009 return 0;
1010 }
linux-next