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TOMOYO Linux Cross Reference
Linux/arch/x86/um/signal.c

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  1 /*
  2  * Copyright (C) 2003 PathScale, Inc.
  3  * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  4  * Licensed under the GPL
  5  */
  6 
  7 
  8 #include <linux/personality.h>
  9 #include <linux/ptrace.h>
 10 #include <linux/kernel.h>
 11 #include <asm/unistd.h>
 12 #include <asm/uaccess.h>
 13 #include <asm/ucontext.h>
 14 #include "frame_kern.h"
 15 #include "skas.h"
 16 
 17 #ifdef CONFIG_X86_32
 18 
 19 /*
 20  * FPU tag word conversions.
 21  */
 22 
 23 static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
 24 {
 25         unsigned int tmp; /* to avoid 16 bit prefixes in the code */
 26 
 27         /* Transform each pair of bits into 01 (valid) or 00 (empty) */
 28         tmp = ~twd;
 29         tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
 30         /* and move the valid bits to the lower byte. */
 31         tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
 32         tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
 33         tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
 34         return tmp;
 35 }
 36 
 37 static inline unsigned long twd_fxsr_to_i387(struct user_fxsr_struct *fxsave)
 38 {
 39         struct _fpxreg *st = NULL;
 40         unsigned long twd = (unsigned long) fxsave->twd;
 41         unsigned long tag;
 42         unsigned long ret = 0xffff0000;
 43         int i;
 44 
 45 #define FPREG_ADDR(f, n)        ((char *)&(f)->st_space + (n) * 16)
 46 
 47         for (i = 0; i < 8; i++) {
 48                 if (twd & 0x1) {
 49                         st = (struct _fpxreg *) FPREG_ADDR(fxsave, i);
 50 
 51                         switch (st->exponent & 0x7fff) {
 52                         case 0x7fff:
 53                                 tag = 2;                /* Special */
 54                                 break;
 55                         case 0x0000:
 56                                 if ( !st->significand[0] &&
 57                                      !st->significand[1] &&
 58                                      !st->significand[2] &&
 59                                      !st->significand[3] ) {
 60                                         tag = 1;        /* Zero */
 61                                 } else {
 62                                         tag = 2;        /* Special */
 63                                 }
 64                                 break;
 65                         default:
 66                                 if (st->significand[3] & 0x8000) {
 67                                         tag = 0;        /* Valid */
 68                                 } else {
 69                                         tag = 2;        /* Special */
 70                                 }
 71                                 break;
 72                         }
 73                 } else {
 74                         tag = 3;                        /* Empty */
 75                 }
 76                 ret |= (tag << (2 * i));
 77                 twd = twd >> 1;
 78         }
 79         return ret;
 80 }
 81 
 82 static int convert_fxsr_to_user(struct _fpstate __user *buf,
 83                                 struct user_fxsr_struct *fxsave)
 84 {
 85         unsigned long env[7];
 86         struct _fpreg __user *to;
 87         struct _fpxreg *from;
 88         int i;
 89 
 90         env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
 91         env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
 92         env[2] = twd_fxsr_to_i387(fxsave);
 93         env[3] = fxsave->fip;
 94         env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
 95         env[5] = fxsave->foo;
 96         env[6] = fxsave->fos;
 97 
 98         if (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
 99                 return 1;
100 
101         to = &buf->_st[0];
102         from = (struct _fpxreg *) &fxsave->st_space[0];
103         for (i = 0; i < 8; i++, to++, from++) {
104                 unsigned long __user *t = (unsigned long __user *)to;
105                 unsigned long *f = (unsigned long *)from;
106 
107                 if (__put_user(*f, t) ||
108                                 __put_user(*(f + 1), t + 1) ||
109                                 __put_user(from->exponent, &to->exponent))
110                         return 1;
111         }
112         return 0;
113 }
114 
115 static int convert_fxsr_from_user(struct user_fxsr_struct *fxsave,
116                                   struct _fpstate __user *buf)
117 {
118         unsigned long env[7];
119         struct _fpxreg *to;
120         struct _fpreg __user *from;
121         int i;
122 
123         if (copy_from_user( env, buf, 7 * sizeof(long)))
124                 return 1;
125 
126         fxsave->cwd = (unsigned short)(env[0] & 0xffff);
127         fxsave->swd = (unsigned short)(env[1] & 0xffff);
128         fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
129         fxsave->fip = env[3];
130         fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16);
131         fxsave->fcs = (env[4] & 0xffff);
132         fxsave->foo = env[5];
133         fxsave->fos = env[6];
134 
135         to = (struct _fpxreg *) &fxsave->st_space[0];
136         from = &buf->_st[0];
137         for (i = 0; i < 8; i++, to++, from++) {
138                 unsigned long *t = (unsigned long *)to;
139                 unsigned long __user *f = (unsigned long __user *)from;
140 
141                 if (__get_user(*t, f) ||
142                     __get_user(*(t + 1), f + 1) ||
143                     __get_user(to->exponent, &from->exponent))
144                         return 1;
145         }
146         return 0;
147 }
148 
149 extern int have_fpx_regs;
150 
151 #endif
152 
153 static int copy_sc_from_user(struct pt_regs *regs,
154                              struct sigcontext __user *from)
155 {
156         struct sigcontext sc;
157         int err, pid;
158 
159         /* Always make any pending restarted system calls return -EINTR */
160         current_thread_info()->restart_block.fn = do_no_restart_syscall;
161 
162         err = copy_from_user(&sc, from, sizeof(sc));
163         if (err)
164                 return err;
165 
166 #define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname
167 
168 #ifdef CONFIG_X86_32
169         GETREG(GS, gs);
170         GETREG(FS, fs);
171         GETREG(ES, es);
172         GETREG(DS, ds);
173 #endif
174         GETREG(DI, di);
175         GETREG(SI, si);
176         GETREG(BP, bp);
177         GETREG(SP, sp);
178         GETREG(BX, bx);
179         GETREG(DX, dx);
180         GETREG(CX, cx);
181         GETREG(AX, ax);
182         GETREG(IP, ip);
183 
184 #ifdef CONFIG_X86_64
185         GETREG(R8, r8);
186         GETREG(R9, r9);
187         GETREG(R10, r10);
188         GETREG(R11, r11);
189         GETREG(R12, r12);
190         GETREG(R13, r13);
191         GETREG(R14, r14);
192         GETREG(R15, r15);
193 #endif
194 
195         GETREG(CS, cs);
196         GETREG(EFLAGS, flags);
197 #ifdef CONFIG_X86_32
198         GETREG(SS, ss);
199 #endif
200 
201 #undef GETREG
202 
203         pid = userspace_pid[current_thread_info()->cpu];
204 #ifdef CONFIG_X86_32
205         if (have_fpx_regs) {
206                 struct user_fxsr_struct fpx;
207 
208                 err = copy_from_user(&fpx,
209                         &((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0],
210                                      sizeof(struct user_fxsr_struct));
211                 if (err)
212                         return 1;
213 
214                 err = convert_fxsr_from_user(&fpx, sc.fpstate);
215                 if (err)
216                         return 1;
217 
218                 err = restore_fpx_registers(pid, (unsigned long *) &fpx);
219                 if (err < 0) {
220                         printk(KERN_ERR "copy_sc_from_user - "
221                                "restore_fpx_registers failed, errno = %d\n",
222                                -err);
223                         return 1;
224                 }
225         } else
226 #endif
227         {
228                 struct user_i387_struct fp;
229 
230                 err = copy_from_user(&fp, sc.fpstate,
231                                      sizeof(struct user_i387_struct));
232                 if (err)
233                         return 1;
234 
235                 err = restore_fp_registers(pid, (unsigned long *) &fp);
236                 if (err < 0) {
237                         printk(KERN_ERR "copy_sc_from_user - "
238                                "restore_fp_registers failed, errno = %d\n",
239                                -err);
240                         return 1;
241                 }
242         }
243         return 0;
244 }
245 
246 static int copy_sc_to_user(struct sigcontext __user *to,
247                            struct _fpstate __user *to_fp, struct pt_regs *regs,
248                            unsigned long mask)
249 {
250         struct sigcontext sc;
251         struct faultinfo * fi = &current->thread.arch.faultinfo;
252         int err, pid;
253         memset(&sc, 0, sizeof(struct sigcontext));
254 
255 #define PUTREG(regno, regname) sc.regname = regs->regs.gp[HOST_##regno]
256 
257 #ifdef CONFIG_X86_32
258         PUTREG(GS, gs);
259         PUTREG(FS, fs);
260         PUTREG(ES, es);
261         PUTREG(DS, ds);
262 #endif
263         PUTREG(DI, di);
264         PUTREG(SI, si);
265         PUTREG(BP, bp);
266         PUTREG(SP, sp);
267         PUTREG(BX, bx);
268         PUTREG(DX, dx);
269         PUTREG(CX, cx);
270         PUTREG(AX, ax);
271 #ifdef CONFIG_X86_64
272         PUTREG(R8, r8);
273         PUTREG(R9, r9);
274         PUTREG(R10, r10);
275         PUTREG(R11, r11);
276         PUTREG(R12, r12);
277         PUTREG(R13, r13);
278         PUTREG(R14, r14);
279         PUTREG(R15, r15);
280 #endif
281 
282         sc.cr2 = fi->cr2;
283         sc.err = fi->error_code;
284         sc.trapno = fi->trap_no;
285         PUTREG(IP, ip);
286         PUTREG(CS, cs);
287         PUTREG(EFLAGS, flags);
288 #ifdef CONFIG_X86_32
289         PUTREG(SP, sp_at_signal);
290         PUTREG(SS, ss);
291 #endif
292 #undef PUTREG
293         sc.oldmask = mask;
294         sc.fpstate = to_fp;
295 
296         err = copy_to_user(to, &sc, sizeof(struct sigcontext));
297         if (err)
298                 return 1;
299 
300         pid = userspace_pid[current_thread_info()->cpu];
301 
302 #ifdef CONFIG_X86_32
303         if (have_fpx_regs) {
304                 struct user_fxsr_struct fpx;
305 
306                 err = save_fpx_registers(pid, (unsigned long *) &fpx);
307                 if (err < 0){
308                         printk(KERN_ERR "copy_sc_to_user - save_fpx_registers "
309                                "failed, errno = %d\n", err);
310                         return 1;
311                 }
312 
313                 err = convert_fxsr_to_user(to_fp, &fpx);
314                 if (err)
315                         return 1;
316 
317                 err |= __put_user(fpx.swd, &to_fp->status);
318                 err |= __put_user(X86_FXSR_MAGIC, &to_fp->magic);
319                 if (err)
320                         return 1;
321 
322                 if (copy_to_user(&to_fp->_fxsr_env[0], &fpx,
323                                  sizeof(struct user_fxsr_struct)))
324                         return 1;
325         } else
326 #endif
327         {
328                 struct user_i387_struct fp;
329 
330                 err = save_fp_registers(pid, (unsigned long *) &fp);
331                 if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
332                         return 1;
333         }
334 
335         return 0;
336 }
337 
338 #ifdef CONFIG_X86_32
339 static int copy_ucontext_to_user(struct ucontext __user *uc,
340                                  struct _fpstate __user *fp, sigset_t *set,
341                                  unsigned long sp)
342 {
343         int err = 0;
344 
345         err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
346         err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
347         err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
348         err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->thread.regs, 0);
349         err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
350         return err;
351 }
352 
353 struct sigframe
354 {
355         char __user *pretcode;
356         int sig;
357         struct sigcontext sc;
358         struct _fpstate fpstate;
359         unsigned long extramask[_NSIG_WORDS-1];
360         char retcode[8];
361 };
362 
363 struct rt_sigframe
364 {
365         char __user *pretcode;
366         int sig;
367         struct siginfo __user *pinfo;
368         void __user *puc;
369         struct siginfo info;
370         struct ucontext uc;
371         struct _fpstate fpstate;
372         char retcode[8];
373 };
374 
375 int setup_signal_stack_sc(unsigned long stack_top, int sig,
376                           struct k_sigaction *ka, struct pt_regs *regs,
377                           sigset_t *mask)
378 {
379         struct sigframe __user *frame;
380         void __user *restorer;
381         int err = 0;
382 
383         /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */
384         stack_top = ((stack_top + 4) & -16UL) - 4;
385         frame = (struct sigframe __user *) stack_top - 1;
386         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
387                 return 1;
388 
389         restorer = frame->retcode;
390         if (ka->sa.sa_flags & SA_RESTORER)
391                 restorer = ka->sa.sa_restorer;
392 
393         err |= __put_user(restorer, &frame->pretcode);
394         err |= __put_user(sig, &frame->sig);
395         err |= copy_sc_to_user(&frame->sc, &frame->fpstate, regs, mask->sig[0]);
396         if (_NSIG_WORDS > 1)
397                 err |= __copy_to_user(&frame->extramask, &mask->sig[1],
398                                       sizeof(frame->extramask));
399 
400         /*
401          * This is popl %eax ; movl $,%eax ; int $0x80
402          *
403          * WE DO NOT USE IT ANY MORE! It's only left here for historical
404          * reasons and because gdb uses it as a signature to notice
405          * signal handler stack frames.
406          */
407         err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
408         err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
409         err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
410 
411         if (err)
412                 return err;
413 
414         PT_REGS_SP(regs) = (unsigned long) frame;
415         PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
416         PT_REGS_AX(regs) = (unsigned long) sig;
417         PT_REGS_DX(regs) = (unsigned long) 0;
418         PT_REGS_CX(regs) = (unsigned long) 0;
419         return 0;
420 }
421 
422 int setup_signal_stack_si(unsigned long stack_top, int sig,
423                           struct k_sigaction *ka, struct pt_regs *regs,
424                           siginfo_t *info, sigset_t *mask)
425 {
426         struct rt_sigframe __user *frame;
427         void __user *restorer;
428         int err = 0;
429 
430         stack_top &= -8UL;
431         frame = (struct rt_sigframe __user *) stack_top - 1;
432         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
433                 return 1;
434 
435         restorer = frame->retcode;
436         if (ka->sa.sa_flags & SA_RESTORER)
437                 restorer = ka->sa.sa_restorer;
438 
439         err |= __put_user(restorer, &frame->pretcode);
440         err |= __put_user(sig, &frame->sig);
441         err |= __put_user(&frame->info, &frame->pinfo);
442         err |= __put_user(&frame->uc, &frame->puc);
443         err |= copy_siginfo_to_user(&frame->info, info);
444         err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
445                                         PT_REGS_SP(regs));
446 
447         /*
448          * This is movl $,%eax ; int $0x80
449          *
450          * WE DO NOT USE IT ANY MORE! It's only left here for historical
451          * reasons and because gdb uses it as a signature to notice
452          * signal handler stack frames.
453          */
454         err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
455         err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
456         err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
457 
458         if (err)
459                 return err;
460 
461         PT_REGS_SP(regs) = (unsigned long) frame;
462         PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
463         PT_REGS_AX(regs) = (unsigned long) sig;
464         PT_REGS_DX(regs) = (unsigned long) &frame->info;
465         PT_REGS_CX(regs) = (unsigned long) &frame->uc;
466         return 0;
467 }
468 
469 long sys_sigreturn(struct pt_regs *regs)
470 {
471         unsigned long sp = PT_REGS_SP(&current->thread.regs);
472         struct sigframe __user *frame = (struct sigframe __user *)(sp - 8);
473         sigset_t set;
474         struct sigcontext __user *sc = &frame->sc;
475         unsigned long __user *oldmask = &sc->oldmask;
476         unsigned long __user *extramask = frame->extramask;
477         int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
478 
479         if (copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) ||
480             copy_from_user(&set.sig[1], extramask, sig_size))
481                 goto segfault;
482 
483         set_current_blocked(&set);
484 
485         if (copy_sc_from_user(&current->thread.regs, sc))
486                 goto segfault;
487 
488         /* Avoid ERESTART handling */
489         PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
490         return PT_REGS_SYSCALL_RET(&current->thread.regs);
491 
492  segfault:
493         force_sig(SIGSEGV, current);
494         return 0;
495 }
496 
497 #else
498 
499 struct rt_sigframe
500 {
501         char __user *pretcode;
502         struct ucontext uc;
503         struct siginfo info;
504         struct _fpstate fpstate;
505 };
506 
507 int setup_signal_stack_si(unsigned long stack_top, int sig,
508                           struct k_sigaction *ka, struct pt_regs * regs,
509                           siginfo_t *info, sigset_t *set)
510 {
511         struct rt_sigframe __user *frame;
512         int err = 0;
513         struct task_struct *me = current;
514 
515         frame = (struct rt_sigframe __user *)
516                 round_down(stack_top - sizeof(struct rt_sigframe), 16);
517         /* Subtract 128 for a red zone and 8 for proper alignment */
518         frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
519 
520         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
521                 goto out;
522 
523         if (ka->sa.sa_flags & SA_SIGINFO) {
524                 err |= copy_siginfo_to_user(&frame->info, info);
525                 if (err)
526                         goto out;
527         }
528 
529         /* Create the ucontext.  */
530         err |= __put_user(0, &frame->uc.uc_flags);
531         err |= __put_user(0, &frame->uc.uc_link);
532         err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
533         err |= __put_user(sas_ss_flags(PT_REGS_SP(regs)),
534                           &frame->uc.uc_stack.ss_flags);
535         err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
536         err |= copy_sc_to_user(&frame->uc.uc_mcontext, &frame->fpstate, regs,
537                                set->sig[0]);
538         err |= __put_user(&frame->fpstate, &frame->uc.uc_mcontext.fpstate);
539         if (sizeof(*set) == 16) {
540                 err |= __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
541                 err |= __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
542         }
543         else
544                 err |= __copy_to_user(&frame->uc.uc_sigmask, set,
545                                       sizeof(*set));
546 
547         /*
548          * Set up to return from userspace.  If provided, use a stub
549          * already in userspace.
550          */
551         /* x86-64 should always use SA_RESTORER. */
552         if (ka->sa.sa_flags & SA_RESTORER)
553                 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
554         else
555                 /* could use a vstub here */
556                 return err;
557 
558         if (err)
559                 return err;
560 
561         /* Set up registers for signal handler */
562         {
563                 struct exec_domain *ed = current_thread_info()->exec_domain;
564                 if (unlikely(ed && ed->signal_invmap && sig < 32))
565                         sig = ed->signal_invmap[sig];
566         }
567 
568         PT_REGS_SP(regs) = (unsigned long) frame;
569         PT_REGS_DI(regs) = sig;
570         /* In case the signal handler was declared without prototypes */
571         PT_REGS_AX(regs) = 0;
572 
573         /*
574          * This also works for non SA_SIGINFO handlers because they expect the
575          * next argument after the signal number on the stack.
576          */
577         PT_REGS_SI(regs) = (unsigned long) &frame->info;
578         PT_REGS_DX(regs) = (unsigned long) &frame->uc;
579         PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
580  out:
581         return err;
582 }
583 #endif
584 
585 long sys_rt_sigreturn(struct pt_regs *regs)
586 {
587         unsigned long sp = PT_REGS_SP(&current->thread.regs);
588         struct rt_sigframe __user *frame =
589                 (struct rt_sigframe __user *)(sp - sizeof(long));
590         struct ucontext __user *uc = &frame->uc;
591         sigset_t set;
592 
593         if (copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
594                 goto segfault;
595 
596         set_current_blocked(&set);
597 
598         if (copy_sc_from_user(&current->thread.regs, &uc->uc_mcontext))
599                 goto segfault;
600 
601         /* Avoid ERESTART handling */
602         PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
603         return PT_REGS_SYSCALL_RET(&current->thread.regs);
604 
605  segfault:
606         force_sig(SIGSEGV, current);
607         return 0;
608 }
609 
610 #ifdef CONFIG_X86_32
611 long ptregs_sigreturn(void)
612 {
613         return sys_sigreturn(NULL);
614 }
615 long ptregs_rt_sigreturn(void)
616 {
617         return sys_rt_sigreturn(NULL);
618 }
619 #endif
620 

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