~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/arm64/kernel/signal32.c

Version: ~ [ linux-5.13-rc1 ] ~ [ linux-5.12.2 ] ~ [ linux-5.11.19 ] ~ [ linux-5.10.35 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.117 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.190 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.232 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.268 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.268 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Based on arch/arm/kernel/signal.c
  3  *
  4  * Copyright (C) 1995-2009 Russell King
  5  * Copyright (C) 2012 ARM Ltd.
  6  * Modified by Will Deacon <will.deacon@arm.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 19  */
 20 
 21 #include <linux/compat.h>
 22 #include <linux/signal.h>
 23 #include <linux/syscalls.h>
 24 #include <linux/ratelimit.h>
 25 
 26 #include <asm/esr.h>
 27 #include <asm/fpsimd.h>
 28 #include <asm/signal32.h>
 29 #include <asm/uaccess.h>
 30 #include <asm/unistd.h>
 31 
 32 struct compat_sigcontext {
 33         /* We always set these two fields to 0 */
 34         compat_ulong_t                  trap_no;
 35         compat_ulong_t                  error_code;
 36 
 37         compat_ulong_t                  oldmask;
 38         compat_ulong_t                  arm_r0;
 39         compat_ulong_t                  arm_r1;
 40         compat_ulong_t                  arm_r2;
 41         compat_ulong_t                  arm_r3;
 42         compat_ulong_t                  arm_r4;
 43         compat_ulong_t                  arm_r5;
 44         compat_ulong_t                  arm_r6;
 45         compat_ulong_t                  arm_r7;
 46         compat_ulong_t                  arm_r8;
 47         compat_ulong_t                  arm_r9;
 48         compat_ulong_t                  arm_r10;
 49         compat_ulong_t                  arm_fp;
 50         compat_ulong_t                  arm_ip;
 51         compat_ulong_t                  arm_sp;
 52         compat_ulong_t                  arm_lr;
 53         compat_ulong_t                  arm_pc;
 54         compat_ulong_t                  arm_cpsr;
 55         compat_ulong_t                  fault_address;
 56 };
 57 
 58 struct compat_ucontext {
 59         compat_ulong_t                  uc_flags;
 60         compat_uptr_t                   uc_link;
 61         compat_stack_t                  uc_stack;
 62         struct compat_sigcontext        uc_mcontext;
 63         compat_sigset_t                 uc_sigmask;
 64         int             __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))];
 65         compat_ulong_t  uc_regspace[128] __attribute__((__aligned__(8)));
 66 };
 67 
 68 struct compat_vfp_sigframe {
 69         compat_ulong_t  magic;
 70         compat_ulong_t  size;
 71         struct compat_user_vfp {
 72                 compat_u64      fpregs[32];
 73                 compat_ulong_t  fpscr;
 74         } ufp;
 75         struct compat_user_vfp_exc {
 76                 compat_ulong_t  fpexc;
 77                 compat_ulong_t  fpinst;
 78                 compat_ulong_t  fpinst2;
 79         } ufp_exc;
 80 } __attribute__((__aligned__(8)));
 81 
 82 #define VFP_MAGIC               0x56465001
 83 #define VFP_STORAGE_SIZE        sizeof(struct compat_vfp_sigframe)
 84 
 85 #define FSR_WRITE_SHIFT         (11)
 86 
 87 struct compat_aux_sigframe {
 88         struct compat_vfp_sigframe      vfp;
 89 
 90         /* Something that isn't a valid magic number for any coprocessor.  */
 91         unsigned long                   end_magic;
 92 } __attribute__((__aligned__(8)));
 93 
 94 struct compat_sigframe {
 95         struct compat_ucontext  uc;
 96         compat_ulong_t          retcode[2];
 97 };
 98 
 99 struct compat_rt_sigframe {
100         struct compat_siginfo info;
101         struct compat_sigframe sig;
102 };
103 
104 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
105 
106 static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
107 {
108         compat_sigset_t cset;
109 
110         cset.sig[0] = set->sig[0] & 0xffffffffull;
111         cset.sig[1] = set->sig[0] >> 32;
112 
113         return copy_to_user(uset, &cset, sizeof(*uset));
114 }
115 
116 static inline int get_sigset_t(sigset_t *set,
117                                const compat_sigset_t __user *uset)
118 {
119         compat_sigset_t s32;
120 
121         if (copy_from_user(&s32, uset, sizeof(*uset)))
122                 return -EFAULT;
123 
124         set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
125         return 0;
126 }
127 
128 int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
129 {
130         int err;
131 
132         if (!access_ok(VERIFY_WRITE, to, sizeof(*to)))
133                 return -EFAULT;
134 
135         /* If you change siginfo_t structure, please be sure
136          * this code is fixed accordingly.
137          * It should never copy any pad contained in the structure
138          * to avoid security leaks, but must copy the generic
139          * 3 ints plus the relevant union member.
140          * This routine must convert siginfo from 64bit to 32bit as well
141          * at the same time.
142          */
143         err = __put_user(from->si_signo, &to->si_signo);
144         err |= __put_user(from->si_errno, &to->si_errno);
145         err |= __put_user((short)from->si_code, &to->si_code);
146         if (from->si_code < 0)
147                 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad,
148                                       SI_PAD_SIZE);
149         else switch (from->si_code & __SI_MASK) {
150         case __SI_KILL:
151                 err |= __put_user(from->si_pid, &to->si_pid);
152                 err |= __put_user(from->si_uid, &to->si_uid);
153                 break;
154         case __SI_TIMER:
155                  err |= __put_user(from->si_tid, &to->si_tid);
156                  err |= __put_user(from->si_overrun, &to->si_overrun);
157                  err |= __put_user(from->si_int, &to->si_int);
158                 break;
159         case __SI_POLL:
160                 err |= __put_user(from->si_band, &to->si_band);
161                 err |= __put_user(from->si_fd, &to->si_fd);
162                 break;
163         case __SI_FAULT:
164                 err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr,
165                                   &to->si_addr);
166 #ifdef BUS_MCEERR_AO
167                 /*
168                  * Other callers might not initialize the si_lsb field,
169                  * so check explicitly for the right codes here.
170                  */
171                 if (from->si_signo == SIGBUS &&
172                     (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO))
173                         err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
174 #endif
175                 break;
176         case __SI_CHLD:
177                 err |= __put_user(from->si_pid, &to->si_pid);
178                 err |= __put_user(from->si_uid, &to->si_uid);
179                 err |= __put_user(from->si_status, &to->si_status);
180                 err |= __put_user(from->si_utime, &to->si_utime);
181                 err |= __put_user(from->si_stime, &to->si_stime);
182                 break;
183         case __SI_RT: /* This is not generated by the kernel as of now. */
184         case __SI_MESGQ: /* But this is */
185                 err |= __put_user(from->si_pid, &to->si_pid);
186                 err |= __put_user(from->si_uid, &to->si_uid);
187                 err |= __put_user(from->si_int, &to->si_int);
188                 break;
189         case __SI_SYS:
190                 err |= __put_user((compat_uptr_t)(unsigned long)
191                                 from->si_call_addr, &to->si_call_addr);
192                 err |= __put_user(from->si_syscall, &to->si_syscall);
193                 err |= __put_user(from->si_arch, &to->si_arch);
194                 break;
195         default: /* this is just in case for now ... */
196                 err |= __put_user(from->si_pid, &to->si_pid);
197                 err |= __put_user(from->si_uid, &to->si_uid);
198                 break;
199         }
200         return err;
201 }
202 
203 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
204 {
205         if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) ||
206             copy_from_user(to->_sifields._pad,
207                            from->_sifields._pad, SI_PAD_SIZE))
208                 return -EFAULT;
209 
210         return 0;
211 }
212 
213 /*
214  * VFP save/restore code.
215  *
216  * We have to be careful with endianness, since the fpsimd context-switch
217  * code operates on 128-bit (Q) register values whereas the compat ABI
218  * uses an array of 64-bit (D) registers. Consequently, we need to swap
219  * the two halves of each Q register when running on a big-endian CPU.
220  */
221 union __fpsimd_vreg {
222         __uint128_t     raw;
223         struct {
224 #ifdef __AARCH64EB__
225                 u64     hi;
226                 u64     lo;
227 #else
228                 u64     lo;
229                 u64     hi;
230 #endif
231         };
232 };
233 
234 static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
235 {
236         struct fpsimd_state *fpsimd = &current->thread.fpsimd_state;
237         compat_ulong_t magic = VFP_MAGIC;
238         compat_ulong_t size = VFP_STORAGE_SIZE;
239         compat_ulong_t fpscr, fpexc;
240         int i, err = 0;
241 
242         /*
243          * Save the hardware registers to the fpsimd_state structure.
244          * Note that this also saves V16-31, which aren't visible
245          * in AArch32.
246          */
247         fpsimd_preserve_current_state();
248 
249         /* Place structure header on the stack */
250         __put_user_error(magic, &frame->magic, err);
251         __put_user_error(size, &frame->size, err);
252 
253         /*
254          * Now copy the FP registers. Since the registers are packed,
255          * we can copy the prefix we want (V0-V15) as it is.
256          */
257         for (i = 0; i < ARRAY_SIZE(frame->ufp.fpregs); i += 2) {
258                 union __fpsimd_vreg vreg = {
259                         .raw = fpsimd->vregs[i >> 1],
260                 };
261 
262                 __put_user_error(vreg.lo, &frame->ufp.fpregs[i], err);
263                 __put_user_error(vreg.hi, &frame->ufp.fpregs[i + 1], err);
264         }
265 
266         /* Create an AArch32 fpscr from the fpsr and the fpcr. */
267         fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) |
268                 (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK);
269         __put_user_error(fpscr, &frame->ufp.fpscr, err);
270 
271         /*
272          * The exception register aren't available so we fake up a
273          * basic FPEXC and zero everything else.
274          */
275         fpexc = (1 << 30);
276         __put_user_error(fpexc, &frame->ufp_exc.fpexc, err);
277         __put_user_error(0, &frame->ufp_exc.fpinst, err);
278         __put_user_error(0, &frame->ufp_exc.fpinst2, err);
279 
280         return err ? -EFAULT : 0;
281 }
282 
283 static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
284 {
285         struct fpsimd_state fpsimd;
286         compat_ulong_t magic = VFP_MAGIC;
287         compat_ulong_t size = VFP_STORAGE_SIZE;
288         compat_ulong_t fpscr;
289         int i, err = 0;
290 
291         __get_user_error(magic, &frame->magic, err);
292         __get_user_error(size, &frame->size, err);
293 
294         if (err)
295                 return -EFAULT;
296         if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
297                 return -EINVAL;
298 
299         /* Copy the FP registers into the start of the fpsimd_state. */
300         for (i = 0; i < ARRAY_SIZE(frame->ufp.fpregs); i += 2) {
301                 union __fpsimd_vreg vreg;
302 
303                 __get_user_error(vreg.lo, &frame->ufp.fpregs[i], err);
304                 __get_user_error(vreg.hi, &frame->ufp.fpregs[i + 1], err);
305                 fpsimd.vregs[i >> 1] = vreg.raw;
306         }
307 
308         /* Extract the fpsr and the fpcr from the fpscr */
309         __get_user_error(fpscr, &frame->ufp.fpscr, err);
310         fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK;
311         fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
312 
313         /*
314          * We don't need to touch the exception register, so
315          * reload the hardware state.
316          */
317         if (!err)
318                 fpsimd_update_current_state(&fpsimd);
319 
320         return err ? -EFAULT : 0;
321 }
322 
323 static int compat_restore_sigframe(struct pt_regs *regs,
324                                    struct compat_sigframe __user *sf)
325 {
326         int err;
327         sigset_t set;
328         struct compat_aux_sigframe __user *aux;
329 
330         err = get_sigset_t(&set, &sf->uc.uc_sigmask);
331         if (err == 0) {
332                 sigdelsetmask(&set, ~_BLOCKABLE);
333                 set_current_blocked(&set);
334         }
335 
336         __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
337         __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
338         __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
339         __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
340         __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
341         __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
342         __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
343         __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
344         __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
345         __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
346         __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
347         __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
348         __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
349         __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
350         __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
351         __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
352         __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
353 
354         /*
355          * Avoid compat_sys_sigreturn() restarting.
356          */
357         regs->syscallno = ~0UL;
358 
359         err |= !valid_user_regs(&regs->user_regs, current);
360 
361         aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
362         if (err == 0)
363                 err |= compat_restore_vfp_context(&aux->vfp);
364 
365         return err;
366 }
367 
368 asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
369 {
370         struct compat_sigframe __user *frame;
371 
372         /* Always make any pending restarted system calls return -EINTR */
373         current->restart_block.fn = do_no_restart_syscall;
374 
375         /*
376          * Since we stacked the signal on a 64-bit boundary,
377          * then 'sp' should be word aligned here.  If it's
378          * not, then the user is trying to mess with us.
379          */
380         if (regs->compat_sp & 7)
381                 goto badframe;
382 
383         frame = (struct compat_sigframe __user *)regs->compat_sp;
384 
385         if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
386                 goto badframe;
387 
388         if (compat_restore_sigframe(regs, frame))
389                 goto badframe;
390 
391         return regs->regs[0];
392 
393 badframe:
394         if (show_unhandled_signals)
395                 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
396                                     current->comm, task_pid_nr(current), __func__,
397                                     regs->pc, regs->compat_sp);
398         force_sig(SIGSEGV, current);
399         return 0;
400 }
401 
402 asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
403 {
404         struct compat_rt_sigframe __user *frame;
405 
406         /* Always make any pending restarted system calls return -EINTR */
407         current->restart_block.fn = do_no_restart_syscall;
408 
409         /*
410          * Since we stacked the signal on a 64-bit boundary,
411          * then 'sp' should be word aligned here.  If it's
412          * not, then the user is trying to mess with us.
413          */
414         if (regs->compat_sp & 7)
415                 goto badframe;
416 
417         frame = (struct compat_rt_sigframe __user *)regs->compat_sp;
418 
419         if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
420                 goto badframe;
421 
422         if (compat_restore_sigframe(regs, &frame->sig))
423                 goto badframe;
424 
425         if (compat_restore_altstack(&frame->sig.uc.uc_stack))
426                 goto badframe;
427 
428         return regs->regs[0];
429 
430 badframe:
431         if (show_unhandled_signals)
432                 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
433                                     current->comm, task_pid_nr(current), __func__,
434                                     regs->pc, regs->compat_sp);
435         force_sig(SIGSEGV, current);
436         return 0;
437 }
438 
439 static void __user *compat_get_sigframe(struct ksignal *ksig,
440                                         struct pt_regs *regs,
441                                         int framesize)
442 {
443         compat_ulong_t sp = sigsp(regs->compat_sp, ksig);
444         void __user *frame;
445 
446         /*
447          * ATPCS B01 mandates 8-byte alignment
448          */
449         frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7));
450 
451         /*
452          * Check that we can actually write to the signal frame.
453          */
454         if (!access_ok(VERIFY_WRITE, frame, framesize))
455                 frame = NULL;
456 
457         return frame;
458 }
459 
460 static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka,
461                                 compat_ulong_t __user *rc, void __user *frame,
462                                 int usig)
463 {
464         compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
465         compat_ulong_t retcode;
466         compat_ulong_t spsr = regs->pstate & ~(PSR_f | COMPAT_PSR_E_BIT);
467         int thumb;
468 
469         /* Check if the handler is written for ARM or Thumb */
470         thumb = handler & 1;
471 
472         if (thumb)
473                 spsr |= COMPAT_PSR_T_BIT;
474         else
475                 spsr &= ~COMPAT_PSR_T_BIT;
476 
477         /* The IT state must be cleared for both ARM and Thumb-2 */
478         spsr &= ~COMPAT_PSR_IT_MASK;
479 
480         /* Restore the original endianness */
481         spsr |= COMPAT_PSR_ENDSTATE;
482 
483         if (ka->sa.sa_flags & SA_RESTORER) {
484                 retcode = ptr_to_compat(ka->sa.sa_restorer);
485         } else {
486                 /* Set up sigreturn pointer */
487                 unsigned int idx = thumb << 1;
488 
489                 if (ka->sa.sa_flags & SA_SIGINFO)
490                         idx += 3;
491 
492                 retcode = AARCH32_VECTORS_BASE +
493                           AARCH32_KERN_SIGRET_CODE_OFFSET +
494                           (idx << 2) + thumb;
495         }
496 
497         regs->regs[0]   = usig;
498         regs->compat_sp = ptr_to_compat(frame);
499         regs->compat_lr = retcode;
500         regs->pc        = handler;
501         regs->pstate    = spsr;
502 }
503 
504 static int compat_setup_sigframe(struct compat_sigframe __user *sf,
505                                  struct pt_regs *regs, sigset_t *set)
506 {
507         struct compat_aux_sigframe __user *aux;
508         int err = 0;
509 
510         __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
511         __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
512         __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
513         __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
514         __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
515         __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
516         __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
517         __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
518         __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
519         __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
520         __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
521         __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
522         __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
523         __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
524         __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
525         __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
526         __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
527 
528         __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err);
529         /* set the compat FSR WnR */
530         __put_user_error(!!(current->thread.fault_code & ESR_ELx_WNR) <<
531                          FSR_WRITE_SHIFT, &sf->uc.uc_mcontext.error_code, err);
532         __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
533         __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
534 
535         err |= put_sigset_t(&sf->uc.uc_sigmask, set);
536 
537         aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
538 
539         if (err == 0)
540                 err |= compat_preserve_vfp_context(&aux->vfp);
541         __put_user_error(0, &aux->end_magic, err);
542 
543         return err;
544 }
545 
546 /*
547  * 32-bit signal handling routines called from signal.c
548  */
549 int compat_setup_rt_frame(int usig, struct ksignal *ksig,
550                           sigset_t *set, struct pt_regs *regs)
551 {
552         struct compat_rt_sigframe __user *frame;
553         int err = 0;
554 
555         frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
556 
557         if (!frame)
558                 return 1;
559 
560         err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
561 
562         __put_user_error(0, &frame->sig.uc.uc_flags, err);
563         __put_user_error(0, &frame->sig.uc.uc_link, err);
564 
565         err |= __compat_save_altstack(&frame->sig.uc.uc_stack, regs->compat_sp);
566 
567         err |= compat_setup_sigframe(&frame->sig, regs, set);
568 
569         if (err == 0) {
570                 compat_setup_return(regs, &ksig->ka, frame->sig.retcode, frame, usig);
571                 regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info;
572                 regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc;
573         }
574 
575         return err;
576 }
577 
578 int compat_setup_frame(int usig, struct ksignal *ksig, sigset_t *set,
579                        struct pt_regs *regs)
580 {
581         struct compat_sigframe __user *frame;
582         int err = 0;
583 
584         frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
585 
586         if (!frame)
587                 return 1;
588 
589         __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
590 
591         err |= compat_setup_sigframe(frame, regs, set);
592         if (err == 0)
593                 compat_setup_return(regs, &ksig->ka, frame->retcode, frame, usig);
594 
595         return err;
596 }
597 
598 void compat_setup_restart_syscall(struct pt_regs *regs)
599 {
600        regs->regs[7] = __NR_compat_restart_syscall;
601 }
602 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp