Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
ba180fd4 | 2 | * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
7796931f JD |
6 | #include <linux/ptrace.h> |
7 | #include <asm/unistd.h> | |
8 | #include <asm/uaccess.h> | |
9 | #include <asm/ucontext.h> | |
1da177e4 | 10 | #include "frame_kern.h" |
1da177e4 LT |
11 | #include "skas.h" |
12 | ||
a5f6096c JD |
13 | /* |
14 | * FPU tag word conversions. | |
15 | */ | |
16 | ||
17 | static inline unsigned short twd_i387_to_fxsr(unsigned short twd) | |
18 | { | |
19 | unsigned int tmp; /* to avoid 16 bit prefixes in the code */ | |
20 | ||
21 | /* Transform each pair of bits into 01 (valid) or 00 (empty) */ | |
22 | tmp = ~twd; | |
23 | tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */ | |
24 | /* and move the valid bits to the lower byte. */ | |
25 | tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */ | |
26 | tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */ | |
27 | tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */ | |
28 | return tmp; | |
29 | } | |
30 | ||
31 | static inline unsigned long twd_fxsr_to_i387(struct user_fxsr_struct *fxsave) | |
32 | { | |
33 | struct _fpxreg *st = NULL; | |
34 | unsigned long twd = (unsigned long) fxsave->twd; | |
35 | unsigned long tag; | |
36 | unsigned long ret = 0xffff0000; | |
37 | int i; | |
38 | ||
497888cf | 39 | #define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16) |
a5f6096c JD |
40 | |
41 | for (i = 0; i < 8; i++) { | |
42 | if (twd & 0x1) { | |
43 | st = (struct _fpxreg *) FPREG_ADDR(fxsave, i); | |
44 | ||
45 | switch (st->exponent & 0x7fff) { | |
46 | case 0x7fff: | |
47 | tag = 2; /* Special */ | |
48 | break; | |
49 | case 0x0000: | |
50 | if ( !st->significand[0] && | |
51 | !st->significand[1] && | |
52 | !st->significand[2] && | |
53 | !st->significand[3] ) { | |
54 | tag = 1; /* Zero */ | |
55 | } else { | |
56 | tag = 2; /* Special */ | |
57 | } | |
58 | break; | |
59 | default: | |
60 | if (st->significand[3] & 0x8000) { | |
61 | tag = 0; /* Valid */ | |
62 | } else { | |
63 | tag = 2; /* Special */ | |
64 | } | |
65 | break; | |
66 | } | |
67 | } else { | |
68 | tag = 3; /* Empty */ | |
69 | } | |
70 | ret |= (tag << (2 * i)); | |
71 | twd = twd >> 1; | |
72 | } | |
73 | return ret; | |
74 | } | |
75 | ||
76 | static int convert_fxsr_to_user(struct _fpstate __user *buf, | |
77 | struct user_fxsr_struct *fxsave) | |
78 | { | |
79 | unsigned long env[7]; | |
80 | struct _fpreg __user *to; | |
81 | struct _fpxreg *from; | |
82 | int i; | |
83 | ||
84 | env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul; | |
85 | env[1] = (unsigned long)fxsave->swd | 0xffff0000ul; | |
86 | env[2] = twd_fxsr_to_i387(fxsave); | |
87 | env[3] = fxsave->fip; | |
88 | env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16); | |
89 | env[5] = fxsave->foo; | |
90 | env[6] = fxsave->fos; | |
91 | ||
92 | if (__copy_to_user(buf, env, 7 * sizeof(unsigned long))) | |
93 | return 1; | |
94 | ||
95 | to = &buf->_st[0]; | |
96 | from = (struct _fpxreg *) &fxsave->st_space[0]; | |
97 | for (i = 0; i < 8; i++, to++, from++) { | |
98 | unsigned long __user *t = (unsigned long __user *)to; | |
99 | unsigned long *f = (unsigned long *)from; | |
100 | ||
101 | if (__put_user(*f, t) || | |
102 | __put_user(*(f + 1), t + 1) || | |
103 | __put_user(from->exponent, &to->exponent)) | |
104 | return 1; | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static int convert_fxsr_from_user(struct user_fxsr_struct *fxsave, | |
110 | struct _fpstate __user *buf) | |
111 | { | |
112 | unsigned long env[7]; | |
113 | struct _fpxreg *to; | |
114 | struct _fpreg __user *from; | |
115 | int i; | |
116 | ||
117 | if (copy_from_user( env, buf, 7 * sizeof(long))) | |
118 | return 1; | |
119 | ||
120 | fxsave->cwd = (unsigned short)(env[0] & 0xffff); | |
121 | fxsave->swd = (unsigned short)(env[1] & 0xffff); | |
122 | fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff)); | |
123 | fxsave->fip = env[3]; | |
124 | fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16); | |
125 | fxsave->fcs = (env[4] & 0xffff); | |
126 | fxsave->foo = env[5]; | |
127 | fxsave->fos = env[6]; | |
128 | ||
129 | to = (struct _fpxreg *) &fxsave->st_space[0]; | |
130 | from = &buf->_st[0]; | |
131 | for (i = 0; i < 8; i++, to++, from++) { | |
132 | unsigned long *t = (unsigned long *)to; | |
133 | unsigned long __user *f = (unsigned long __user *)from; | |
134 | ||
135 | if (__get_user(*t, f) || | |
136 | __get_user(*(t + 1), f + 1) || | |
137 | __get_user(to->exponent, &from->exponent)) | |
138 | return 1; | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
143 | extern int have_fpx_regs; | |
144 | ||
77bf4400 JD |
145 | static int copy_sc_from_user(struct pt_regs *regs, |
146 | struct sigcontext __user *from) | |
1da177e4 | 147 | { |
a5f6096c | 148 | struct sigcontext sc; |
a5a678c8 | 149 | int err, pid; |
1da177e4 LT |
150 | |
151 | err = copy_from_user(&sc, from, sizeof(sc)); | |
ba180fd4 | 152 | if (err) |
5d86456d | 153 | return err; |
1da177e4 | 154 | |
a5a678c8 | 155 | pid = userspace_pid[current_thread_info()->cpu]; |
a955bd61 AV |
156 | |
157 | #define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname | |
158 | ||
159 | GETREG(GS, gs); | |
160 | GETREG(FS, fs); | |
161 | GETREG(ES, es); | |
162 | GETREG(DS, ds); | |
163 | GETREG(EDI, di); | |
164 | GETREG(ESI, si); | |
165 | GETREG(EBP, bp); | |
166 | GETREG(SP, sp); | |
167 | GETREG(EBX, bx); | |
168 | GETREG(EDX, dx); | |
169 | GETREG(ECX, cx); | |
170 | GETREG(EAX, ax); | |
171 | GETREG(IP, ip); | |
172 | GETREG(CS, cs); | |
173 | GETREG(EFLAGS, flags); | |
174 | GETREG(SS, ss); | |
175 | ||
176 | #undef GETREG | |
a5f6096c JD |
177 | if (have_fpx_regs) { |
178 | struct user_fxsr_struct fpx; | |
1da177e4 | 179 | |
966c8079 WC |
180 | err = copy_from_user(&fpx, |
181 | &((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0], | |
a5f6096c JD |
182 | sizeof(struct user_fxsr_struct)); |
183 | if (err) | |
184 | return 1; | |
185 | ||
186 | err = convert_fxsr_from_user(&fpx, sc.fpstate); | |
187 | if (err) | |
188 | return 1; | |
189 | ||
a5a678c8 | 190 | err = restore_fpx_registers(pid, (unsigned long *) &fpx); |
a5f6096c JD |
191 | if (err < 0) { |
192 | printk(KERN_ERR "copy_sc_from_user - " | |
193 | "restore_fpx_registers failed, errno = %d\n", | |
194 | -err); | |
195 | return 1; | |
196 | } | |
a955bd61 | 197 | } else { |
a5f6096c JD |
198 | struct user_i387_struct fp; |
199 | ||
200 | err = copy_from_user(&fp, sc.fpstate, | |
201 | sizeof(struct user_i387_struct)); | |
202 | if (err) | |
203 | return 1; | |
204 | ||
a5a678c8 | 205 | err = restore_fp_registers(pid, (unsigned long *) &fp); |
a5f6096c JD |
206 | if (err < 0) { |
207 | printk(KERN_ERR "copy_sc_from_user - " | |
208 | "restore_fp_registers failed, errno = %d\n", | |
209 | -err); | |
210 | return 1; | |
211 | } | |
1da177e4 LT |
212 | } |
213 | ||
5d86456d | 214 | return 0; |
1da177e4 LT |
215 | } |
216 | ||
77bf4400 JD |
217 | static int copy_sc_to_user(struct sigcontext __user *to, |
218 | struct _fpstate __user *to_fp, struct pt_regs *regs, | |
219 | unsigned long sp) | |
1da177e4 | 220 | { |
ba180fd4 | 221 | struct sigcontext sc; |
c578455a | 222 | struct faultinfo * fi = ¤t->thread.arch.faultinfo; |
a5a678c8 | 223 | int err, pid; |
a955bd61 | 224 | memset(&sc, 0, sizeof(struct sigcontext)); |
1da177e4 | 225 | |
18baddda JD |
226 | sc.gs = REGS_GS(regs->regs.gp); |
227 | sc.fs = REGS_FS(regs->regs.gp); | |
228 | sc.es = REGS_ES(regs->regs.gp); | |
229 | sc.ds = REGS_DS(regs->regs.gp); | |
7796931f JD |
230 | sc.di = REGS_EDI(regs->regs.gp); |
231 | sc.si = REGS_ESI(regs->regs.gp); | |
232 | sc.bp = REGS_EBP(regs->regs.gp); | |
233 | sc.sp = sp; | |
234 | sc.bx = REGS_EBX(regs->regs.gp); | |
235 | sc.dx = REGS_EDX(regs->regs.gp); | |
236 | sc.cx = REGS_ECX(regs->regs.gp); | |
237 | sc.ax = REGS_EAX(regs->regs.gp); | |
238 | sc.ip = REGS_IP(regs->regs.gp); | |
18baddda | 239 | sc.cs = REGS_CS(regs->regs.gp); |
7796931f JD |
240 | sc.flags = REGS_EFLAGS(regs->regs.gp); |
241 | sc.sp_at_signal = regs->regs.gp[UESP]; | |
18baddda | 242 | sc.ss = regs->regs.gp[SS]; |
ba180fd4 JD |
243 | sc.cr2 = fi->cr2; |
244 | sc.err = fi->error_code; | |
245 | sc.trapno = fi->trap_no; | |
1da177e4 | 246 | |
4d338e1a | 247 | to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1)); |
1da177e4 LT |
248 | sc.fpstate = to_fp; |
249 | ||
a5a678c8 | 250 | pid = userspace_pid[current_thread_info()->cpu]; |
a5f6096c JD |
251 | if (have_fpx_regs) { |
252 | struct user_fxsr_struct fpx; | |
253 | ||
a5a678c8 | 254 | err = save_fpx_registers(pid, (unsigned long *) &fpx); |
a5f6096c JD |
255 | if (err < 0){ |
256 | printk(KERN_ERR "copy_sc_to_user - save_fpx_registers " | |
257 | "failed, errno = %d\n", err); | |
258 | return 1; | |
259 | } | |
260 | ||
261 | err = convert_fxsr_to_user(to_fp, &fpx); | |
262 | if (err) | |
263 | return 1; | |
264 | ||
265 | err |= __put_user(fpx.swd, &to_fp->status); | |
266 | err |= __put_user(X86_FXSR_MAGIC, &to_fp->magic); | |
267 | if (err) | |
268 | return 1; | |
269 | ||
270 | if (copy_to_user(&to_fp->_fxsr_env[0], &fpx, | |
271 | sizeof(struct user_fxsr_struct))) | |
272 | return 1; | |
273 | } | |
274 | else { | |
275 | struct user_i387_struct fp; | |
276 | ||
a5a678c8 | 277 | err = save_fp_registers(pid, (unsigned long *) &fp); |
a5f6096c JD |
278 | if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct))) |
279 | return 1; | |
280 | } | |
1da177e4 | 281 | |
a5f6096c | 282 | return copy_to_user(to, &sc, sizeof(sc)); |
1da177e4 | 283 | } |
1da177e4 | 284 | |
ba180fd4 JD |
285 | static int copy_ucontext_to_user(struct ucontext __user *uc, |
286 | struct _fpstate __user *fp, sigset_t *set, | |
287 | unsigned long sp) | |
1da177e4 LT |
288 | { |
289 | int err = 0; | |
290 | ||
291 | err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp); | |
292 | err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags); | |
293 | err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size); | |
98c18238 | 294 | err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs, sp); |
1da177e4 | 295 | err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set)); |
5d86456d | 296 | return err; |
1da177e4 LT |
297 | } |
298 | ||
299 | struct sigframe | |
300 | { | |
4d338e1a | 301 | char __user *pretcode; |
1da177e4 LT |
302 | int sig; |
303 | struct sigcontext sc; | |
304 | struct _fpstate fpstate; | |
305 | unsigned long extramask[_NSIG_WORDS-1]; | |
306 | char retcode[8]; | |
307 | }; | |
308 | ||
309 | struct rt_sigframe | |
310 | { | |
4d338e1a | 311 | char __user *pretcode; |
1da177e4 | 312 | int sig; |
4d338e1a AV |
313 | struct siginfo __user *pinfo; |
314 | void __user *puc; | |
1da177e4 LT |
315 | struct siginfo info; |
316 | struct ucontext uc; | |
317 | struct _fpstate fpstate; | |
318 | char retcode[8]; | |
319 | }; | |
320 | ||
321 | int setup_signal_stack_sc(unsigned long stack_top, int sig, | |
322 | struct k_sigaction *ka, struct pt_regs *regs, | |
323 | sigset_t *mask) | |
324 | { | |
325 | struct sigframe __user *frame; | |
4d338e1a | 326 | void __user *restorer; |
98c18238 | 327 | unsigned long save_sp = PT_REGS_SP(regs); |
1da177e4 LT |
328 | int err = 0; |
329 | ||
3896625d JD |
330 | /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */ |
331 | stack_top = ((stack_top + 4) & -16UL) - 4; | |
4d338e1a | 332 | frame = (struct sigframe __user *) stack_top - 1; |
1da177e4 LT |
333 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
334 | return 1; | |
335 | ||
4d338e1a | 336 | restorer = frame->retcode; |
ba180fd4 | 337 | if (ka->sa.sa_flags & SA_RESTORER) |
1da177e4 LT |
338 | restorer = ka->sa.sa_restorer; |
339 | ||
98c18238 JD |
340 | /* Update SP now because the page fault handler refuses to extend |
341 | * the stack if the faulting address is too far below the current | |
342 | * SP, which frame now certainly is. If there's an error, the original | |
343 | * value is restored on the way out. | |
344 | * When writing the sigcontext to the stack, we have to write the | |
345 | * original value, so that's passed to copy_sc_to_user, which does | |
346 | * the right thing with it. | |
347 | */ | |
348 | PT_REGS_SP(regs) = (unsigned long) frame; | |
349 | ||
1da177e4 LT |
350 | err |= __put_user(restorer, &frame->pretcode); |
351 | err |= __put_user(sig, &frame->sig); | |
98c18238 | 352 | err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp); |
1da177e4 LT |
353 | err |= __put_user(mask->sig[0], &frame->sc.oldmask); |
354 | if (_NSIG_WORDS > 1) | |
355 | err |= __copy_to_user(&frame->extramask, &mask->sig[1], | |
356 | sizeof(frame->extramask)); | |
357 | ||
358 | /* | |
359 | * This is popl %eax ; movl $,%eax ; int $0x80 | |
360 | * | |
361 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
362 | * reasons and because gdb uses it as a signature to notice | |
363 | * signal handler stack frames. | |
364 | */ | |
365 | err |= __put_user(0xb858, (short __user *)(frame->retcode+0)); | |
366 | err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2)); | |
367 | err |= __put_user(0x80cd, (short __user *)(frame->retcode+6)); | |
368 | ||
ba180fd4 | 369 | if (err) |
98c18238 | 370 | goto err; |
1da177e4 LT |
371 | |
372 | PT_REGS_SP(regs) = (unsigned long) frame; | |
373 | PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; | |
374 | PT_REGS_EAX(regs) = (unsigned long) sig; | |
375 | PT_REGS_EDX(regs) = (unsigned long) 0; | |
376 | PT_REGS_ECX(regs) = (unsigned long) 0; | |
377 | ||
378 | if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) | |
379 | ptrace_notify(SIGTRAP); | |
98c18238 JD |
380 | return 0; |
381 | ||
382 | err: | |
383 | PT_REGS_SP(regs) = save_sp; | |
384 | return err; | |
1da177e4 LT |
385 | } |
386 | ||
387 | int setup_signal_stack_si(unsigned long stack_top, int sig, | |
388 | struct k_sigaction *ka, struct pt_regs *regs, | |
389 | siginfo_t *info, sigset_t *mask) | |
390 | { | |
391 | struct rt_sigframe __user *frame; | |
4d338e1a | 392 | void __user *restorer; |
98c18238 | 393 | unsigned long save_sp = PT_REGS_SP(regs); |
1da177e4 LT |
394 | int err = 0; |
395 | ||
396 | stack_top &= -8UL; | |
4d338e1a | 397 | frame = (struct rt_sigframe __user *) stack_top - 1; |
1da177e4 LT |
398 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
399 | return 1; | |
400 | ||
4d338e1a | 401 | restorer = frame->retcode; |
ba180fd4 | 402 | if (ka->sa.sa_flags & SA_RESTORER) |
1da177e4 LT |
403 | restorer = ka->sa.sa_restorer; |
404 | ||
98c18238 JD |
405 | /* See comment above about why this is here */ |
406 | PT_REGS_SP(regs) = (unsigned long) frame; | |
407 | ||
1da177e4 LT |
408 | err |= __put_user(restorer, &frame->pretcode); |
409 | err |= __put_user(sig, &frame->sig); | |
410 | err |= __put_user(&frame->info, &frame->pinfo); | |
411 | err |= __put_user(&frame->uc, &frame->puc); | |
412 | err |= copy_siginfo_to_user(&frame->info, info); | |
413 | err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask, | |
98c18238 | 414 | save_sp); |
1da177e4 LT |
415 | |
416 | /* | |
417 | * This is movl $,%eax ; int $0x80 | |
418 | * | |
419 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
420 | * reasons and because gdb uses it as a signature to notice | |
421 | * signal handler stack frames. | |
422 | */ | |
423 | err |= __put_user(0xb8, (char __user *)(frame->retcode+0)); | |
424 | err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1)); | |
425 | err |= __put_user(0x80cd, (short __user *)(frame->retcode+5)); | |
426 | ||
ba180fd4 | 427 | if (err) |
98c18238 | 428 | goto err; |
1da177e4 | 429 | |
1da177e4 LT |
430 | PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; |
431 | PT_REGS_EAX(regs) = (unsigned long) sig; | |
432 | PT_REGS_EDX(regs) = (unsigned long) &frame->info; | |
433 | PT_REGS_ECX(regs) = (unsigned long) &frame->uc; | |
434 | ||
435 | if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) | |
436 | ptrace_notify(SIGTRAP); | |
98c18238 JD |
437 | return 0; |
438 | ||
439 | err: | |
440 | PT_REGS_SP(regs) = save_sp; | |
441 | return err; | |
1da177e4 LT |
442 | } |
443 | ||
444 | long sys_sigreturn(struct pt_regs regs) | |
445 | { | |
446 | unsigned long sp = PT_REGS_SP(¤t->thread.regs); | |
4d338e1a | 447 | struct sigframe __user *frame = (struct sigframe __user *)(sp - 8); |
1da177e4 LT |
448 | sigset_t set; |
449 | struct sigcontext __user *sc = &frame->sc; | |
450 | unsigned long __user *oldmask = &sc->oldmask; | |
451 | unsigned long __user *extramask = frame->extramask; | |
452 | int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long); | |
453 | ||
ba180fd4 JD |
454 | if (copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) || |
455 | copy_from_user(&set.sig[1], extramask, sig_size)) | |
1da177e4 LT |
456 | goto segfault; |
457 | ||
458 | sigdelsetmask(&set, ~_BLOCKABLE); | |
78722a44 | 459 | set_current_blocked(&set); |
1da177e4 | 460 | |
ba180fd4 | 461 | if (copy_sc_from_user(¤t->thread.regs, sc)) |
1da177e4 LT |
462 | goto segfault; |
463 | ||
464 | /* Avoid ERESTART handling */ | |
465 | PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1; | |
5d86456d | 466 | return PT_REGS_SYSCALL_RET(¤t->thread.regs); |
1da177e4 LT |
467 | |
468 | segfault: | |
469 | force_sig(SIGSEGV, current); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | long sys_rt_sigreturn(struct pt_regs regs) | |
474 | { | |
4d338e1a | 475 | unsigned long sp = PT_REGS_SP(¤t->thread.regs); |
ba180fd4 JD |
476 | struct rt_sigframe __user *frame = |
477 | (struct rt_sigframe __user *) (sp - 4); | |
1da177e4 LT |
478 | sigset_t set; |
479 | struct ucontext __user *uc = &frame->uc; | |
480 | int sig_size = _NSIG_WORDS * sizeof(unsigned long); | |
481 | ||
ba180fd4 | 482 | if (copy_from_user(&set, &uc->uc_sigmask, sig_size)) |
1da177e4 LT |
483 | goto segfault; |
484 | ||
485 | sigdelsetmask(&set, ~_BLOCKABLE); | |
78722a44 | 486 | set_current_blocked(&set); |
1da177e4 | 487 | |
ba180fd4 | 488 | if (copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext)) |
1da177e4 LT |
489 | goto segfault; |
490 | ||
491 | /* Avoid ERESTART handling */ | |
492 | PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1; | |
5d86456d | 493 | return PT_REGS_SYSCALL_RET(¤t->thread.regs); |
1da177e4 LT |
494 | |
495 | segfault: | |
496 | force_sig(SIGSEGV, current); | |
497 | return 0; | |
498 | } |