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

Version: ~ [ linux-5.2 ] ~ [ linux-5.1.16 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.57 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.132 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.184 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.184 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.69 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ 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 explicitely for the right codes here.
170                  */
171                 if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
172                         err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
173 #endif
174                 break;
175         case __SI_CHLD:
176                 err |= __put_user(from->si_pid, &to->si_pid);
177                 err |= __put_user(from->si_uid, &to->si_uid);
178                 err |= __put_user(from->si_status, &to->si_status);
179                 err |= __put_user(from->si_utime, &to->si_utime);
180                 err |= __put_user(from->si_stime, &to->si_stime);
181                 break;
182         case __SI_RT: /* This is not generated by the kernel as of now. */
183         case __SI_MESGQ: /* But this is */
184                 err |= __put_user(from->si_pid, &to->si_pid);
185                 err |= __put_user(from->si_uid, &to->si_uid);
186                 err |= __put_user(from->si_int, &to->si_int);
187                 break;
188         case __SI_SYS:
189                 err |= __put_user((compat_uptr_t)(unsigned long)
190                                 from->si_call_addr, &to->si_call_addr);
191                 err |= __put_user(from->si_syscall, &to->si_syscall);
192                 err |= __put_user(from->si_arch, &to->si_arch);
193                 break;
194         default: /* this is just in case for now ... */
195                 err |= __put_user(from->si_pid, &to->si_pid);
196                 err |= __put_user(from->si_uid, &to->si_uid);
197                 break;
198         }
199         return err;
200 }
201 
202 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
203 {
204         memset(to, 0, sizeof *to);
205 
206         if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) ||
207             copy_from_user(to->_sifields._pad,
208                            from->_sifields._pad, SI_PAD_SIZE))
209                 return -EFAULT;
210 
211         return 0;
212 }
213 
214 /*
215  * VFP save/restore code.
216  */
217 static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
218 {
219         struct fpsimd_state *fpsimd = &current->thread.fpsimd_state;
220         compat_ulong_t magic = VFP_MAGIC;
221         compat_ulong_t size = VFP_STORAGE_SIZE;
222         compat_ulong_t fpscr, fpexc;
223         int err = 0;
224 
225         /*
226          * Save the hardware registers to the fpsimd_state structure.
227          * Note that this also saves V16-31, which aren't visible
228          * in AArch32.
229          */
230         fpsimd_preserve_current_state();
231 
232         /* Place structure header on the stack */
233         __put_user_error(magic, &frame->magic, err);
234         __put_user_error(size, &frame->size, err);
235 
236         /*
237          * Now copy the FP registers. Since the registers are packed,
238          * we can copy the prefix we want (V0-V15) as it is.
239          * FIXME: Won't work if big endian.
240          */
241         err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs,
242                               sizeof(frame->ufp.fpregs));
243 
244         /* Create an AArch32 fpscr from the fpsr and the fpcr. */
245         fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) |
246                 (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK);
247         __put_user_error(fpscr, &frame->ufp.fpscr, err);
248 
249         /*
250          * The exception register aren't available so we fake up a
251          * basic FPEXC and zero everything else.
252          */
253         fpexc = (1 << 30);
254         __put_user_error(fpexc, &frame->ufp_exc.fpexc, err);
255         __put_user_error(0, &frame->ufp_exc.fpinst, err);
256         __put_user_error(0, &frame->ufp_exc.fpinst2, err);
257 
258         return err ? -EFAULT : 0;
259 }
260 
261 static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
262 {
263         struct fpsimd_state fpsimd;
264         compat_ulong_t magic = VFP_MAGIC;
265         compat_ulong_t size = VFP_STORAGE_SIZE;
266         compat_ulong_t fpscr;
267         int err = 0;
268 
269         __get_user_error(magic, &frame->magic, err);
270         __get_user_error(size, &frame->size, err);
271 
272         if (err)
273                 return -EFAULT;
274         if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
275                 return -EINVAL;
276 
277         /*
278          * Copy the FP registers into the start of the fpsimd_state.
279          * FIXME: Won't work if big endian.
280          */
281         err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs,
282                                 sizeof(frame->ufp.fpregs));
283 
284         /* Extract the fpsr and the fpcr from the fpscr */
285         __get_user_error(fpscr, &frame->ufp.fpscr, err);
286         fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK;
287         fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
288 
289         /*
290          * We don't need to touch the exception register, so
291          * reload the hardware state.
292          */
293         if (!err)
294                 fpsimd_update_current_state(&fpsimd);
295 
296         return err ? -EFAULT : 0;
297 }
298 
299 static int compat_restore_sigframe(struct pt_regs *regs,
300                                    struct compat_sigframe __user *sf)
301 {
302         int err;
303         sigset_t set;
304         struct compat_aux_sigframe __user *aux;
305 
306         err = get_sigset_t(&set, &sf->uc.uc_sigmask);
307         if (err == 0) {
308                 sigdelsetmask(&set, ~_BLOCKABLE);
309                 set_current_blocked(&set);
310         }
311 
312         __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
313         __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
314         __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
315         __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
316         __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
317         __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
318         __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
319         __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
320         __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
321         __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
322         __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
323         __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
324         __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
325         __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
326         __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
327         __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
328         __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
329 
330         /*
331          * Avoid compat_sys_sigreturn() restarting.
332          */
333         regs->syscallno = ~0UL;
334 
335         err |= !valid_user_regs(&regs->user_regs);
336 
337         aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
338         if (err == 0)
339                 err |= compat_restore_vfp_context(&aux->vfp);
340 
341         return err;
342 }
343 
344 asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
345 {
346         struct compat_sigframe __user *frame;
347 
348         /* Always make any pending restarted system calls return -EINTR */
349         current_thread_info()->restart_block.fn = do_no_restart_syscall;
350 
351         /*
352          * Since we stacked the signal on a 64-bit boundary,
353          * then 'sp' should be word aligned here.  If it's
354          * not, then the user is trying to mess with us.
355          */
356         if (regs->compat_sp & 7)
357                 goto badframe;
358 
359         frame = (struct compat_sigframe __user *)regs->compat_sp;
360 
361         if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
362                 goto badframe;
363 
364         if (compat_restore_sigframe(regs, frame))
365                 goto badframe;
366 
367         return regs->regs[0];
368 
369 badframe:
370         if (show_unhandled_signals)
371                 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
372                                     current->comm, task_pid_nr(current), __func__,
373                                     regs->pc, regs->sp);
374         force_sig(SIGSEGV, current);
375         return 0;
376 }
377 
378 asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
379 {
380         struct compat_rt_sigframe __user *frame;
381 
382         /* Always make any pending restarted system calls return -EINTR */
383         current_thread_info()->restart_block.fn = do_no_restart_syscall;
384 
385         /*
386          * Since we stacked the signal on a 64-bit boundary,
387          * then 'sp' should be word aligned here.  If it's
388          * not, then the user is trying to mess with us.
389          */
390         if (regs->compat_sp & 7)
391                 goto badframe;
392 
393         frame = (struct compat_rt_sigframe __user *)regs->compat_sp;
394 
395         if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
396                 goto badframe;
397 
398         if (compat_restore_sigframe(regs, &frame->sig))
399                 goto badframe;
400 
401         if (compat_restore_altstack(&frame->sig.uc.uc_stack))
402                 goto badframe;
403 
404         return regs->regs[0];
405 
406 badframe:
407         if (show_unhandled_signals)
408                 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
409                                     current->comm, task_pid_nr(current), __func__,
410                                     regs->pc, regs->sp);
411         force_sig(SIGSEGV, current);
412         return 0;
413 }
414 
415 static void __user *compat_get_sigframe(struct ksignal *ksig,
416                                         struct pt_regs *regs,
417                                         int framesize)
418 {
419         compat_ulong_t sp = sigsp(regs->compat_sp, ksig);
420         void __user *frame;
421 
422         /*
423          * ATPCS B01 mandates 8-byte alignment
424          */
425         frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7));
426 
427         /*
428          * Check that we can actually write to the signal frame.
429          */
430         if (!access_ok(VERIFY_WRITE, frame, framesize))
431                 frame = NULL;
432 
433         return frame;
434 }
435 
436 static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka,
437                                 compat_ulong_t __user *rc, void __user *frame,
438                                 int usig)
439 {
440         compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
441         compat_ulong_t retcode;
442         compat_ulong_t spsr = regs->pstate & ~PSR_f;
443         int thumb;
444 
445         /* Check if the handler is written for ARM or Thumb */
446         thumb = handler & 1;
447 
448         if (thumb)
449                 spsr |= COMPAT_PSR_T_BIT;
450         else
451                 spsr &= ~COMPAT_PSR_T_BIT;
452 
453         /* The IT state must be cleared for both ARM and Thumb-2 */
454         spsr &= ~COMPAT_PSR_IT_MASK;
455 
456         if (ka->sa.sa_flags & SA_RESTORER) {
457                 retcode = ptr_to_compat(ka->sa.sa_restorer);
458         } else {
459                 /* Set up sigreturn pointer */
460                 unsigned int idx = thumb << 1;
461 
462                 if (ka->sa.sa_flags & SA_SIGINFO)
463                         idx += 3;
464 
465                 retcode = AARCH32_VECTORS_BASE +
466                           AARCH32_KERN_SIGRET_CODE_OFFSET +
467                           (idx << 2) + thumb;
468         }
469 
470         regs->regs[0]   = usig;
471         regs->compat_sp = ptr_to_compat(frame);
472         regs->compat_lr = retcode;
473         regs->pc        = handler;
474         regs->pstate    = spsr;
475 }
476 
477 static int compat_setup_sigframe(struct compat_sigframe __user *sf,
478                                  struct pt_regs *regs, sigset_t *set)
479 {
480         struct compat_aux_sigframe __user *aux;
481         int err = 0;
482 
483         __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
484         __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
485         __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
486         __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
487         __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
488         __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
489         __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
490         __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
491         __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
492         __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
493         __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
494         __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
495         __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
496         __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
497         __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
498         __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
499         __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
500 
501         __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err);
502         /* set the compat FSR WnR */
503         __put_user_error(!!(current->thread.fault_code & ESR_EL1_WRITE) <<
504                          FSR_WRITE_SHIFT, &sf->uc.uc_mcontext.error_code, err);
505         __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
506         __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
507 
508         err |= put_sigset_t(&sf->uc.uc_sigmask, set);
509 
510         aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
511 
512         if (err == 0)
513                 err |= compat_preserve_vfp_context(&aux->vfp);
514         __put_user_error(0, &aux->end_magic, err);
515 
516         return err;
517 }
518 
519 /*
520  * 32-bit signal handling routines called from signal.c
521  */
522 int compat_setup_rt_frame(int usig, struct ksignal *ksig,
523                           sigset_t *set, struct pt_regs *regs)
524 {
525         struct compat_rt_sigframe __user *frame;
526         int err = 0;
527 
528         frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
529 
530         if (!frame)
531                 return 1;
532 
533         err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
534 
535         __put_user_error(0, &frame->sig.uc.uc_flags, err);
536         __put_user_error(0, &frame->sig.uc.uc_link, err);
537 
538         err |= __compat_save_altstack(&frame->sig.uc.uc_stack, regs->compat_sp);
539 
540         err |= compat_setup_sigframe(&frame->sig, regs, set);
541 
542         if (err == 0) {
543                 compat_setup_return(regs, &ksig->ka, frame->sig.retcode, frame, usig);
544                 regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info;
545                 regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc;
546         }
547 
548         return err;
549 }
550 
551 int compat_setup_frame(int usig, struct ksignal *ksig, sigset_t *set,
552                        struct pt_regs *regs)
553 {
554         struct compat_sigframe __user *frame;
555         int err = 0;
556 
557         frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
558 
559         if (!frame)
560                 return 1;
561 
562         __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
563 
564         err |= compat_setup_sigframe(frame, regs, set);
565         if (err == 0)
566                 compat_setup_return(regs, &ksig->ka, frame->retcode, frame, usig);
567 
568         return err;
569 }
570 
571 void compat_setup_restart_syscall(struct pt_regs *regs)
572 {
573        regs->regs[7] = __NR_compat_restart_syscall;
574 }
575 

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