arch/arm64/kernel/signal32.c

   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_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 static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
 217 {
 218         struct fpsimd_state *fpsimd = &current->thread.fpsimd_state;
 219         compat_ulong_t magic = VFP_MAGIC;
 220         compat_ulong_t size = VFP_STORAGE_SIZE;
 221         compat_ulong_t fpscr, fpexc;
 222         int err = 0;
 223
 224         /*
 225          * Save the hardware registers to the fpsimd_state structure.
 226          * Note that this also saves V16-31, which aren't visible
 227          * in AArch32.
 228          */
 229         fpsimd_preserve_current_state();
 230
 231         /* Place structure header on the stack */
 232         __put_user_error(magic, &frame->magic, err);
 233         __put_user_error(size, &frame->size, err);
 234
 235         /*
 236          * Now copy the FP registers. Since the registers are packed,
 237          * we can copy the prefix we want (V0-V15) as it is.
 238          * FIXME: Won't work if big endian.
 239          */
 240         err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs,
 241                               sizeof(frame->ufp.fpregs));
 242
 243         /* Create an AArch32 fpscr from the fpsr and the fpcr. */
 244         fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) |
 245                 (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK);
 246         __put_user_error(fpscr, &frame->ufp.fpscr, err);
 247
 248         /*
 249          * The exception register aren't available so we fake up a
 250          * basic FPEXC and zero everything else.
 251          */
 252         fpexc = (1 << 30);
 253         __put_user_error(fpexc, &frame->ufp_exc.fpexc, err);
 254         __put_user_error(0, &frame->ufp_exc.fpinst, err);
 255         __put_user_error(0, &frame->ufp_exc.fpinst2, err);
 256
 257         return err ? -EFAULT : 0;
 258 }
 259
 260 static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
 261 {
 262         struct fpsimd_state fpsimd;
 263         compat_ulong_t magic = VFP_MAGIC;
 264         compat_ulong_t size = VFP_STORAGE_SIZE;
 265         compat_ulong_t fpscr;
 266         int err = 0;
 267
 268         __get_user_error(magic, &frame->magic, err);
 269         __get_user_error(size, &frame->size, err);
 270
 271         if (err)
 272                 return -EFAULT;
 273         if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
 274                 return -EINVAL;
 275
 276         /*
 277          * Copy the FP registers into the start of the fpsimd_state.
 278          * FIXME: Won't work if big endian.
 279          */
 280         err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs,
 281                                 sizeof(frame->ufp.fpregs));
 282
 283         /* Extract the fpsr and the fpcr from the fpscr */
 284         __get_user_error(fpscr, &frame->ufp.fpscr, err);
 285         fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK;
 286         fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
 287
 288         /*
 289          * We don't need to touch the exception register, so
 290          * reload the hardware state.
 291          */
 292         if (!err)
 293                 fpsimd_update_current_state(&fpsimd);
 294
 295         return err ? -EFAULT : 0;
 296 }
 297
 298 static int compat_restore_sigframe(struct pt_regs *regs,
 299                                    struct compat_sigframe __user *sf)
 300 {
 301         int err;
 302         sigset_t set;
 303         struct compat_aux_sigframe __user *aux;
 304
 305         err = get_sigset_t(&set, &sf->uc.uc_sigmask);
 306         if (err == 0) {
 307                 sigdelsetmask(&set, ~_BLOCKABLE);
 308                 set_current_blocked(&set);
 309         }
 310
 311         __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
 312         __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
 313         __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
 314         __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
 315         __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
 316         __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
 317         __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
 318         __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
 319         __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
 320         __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
 321         __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
 322         __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
 323         __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
 324         __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
 325         __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
 326         __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
 327         __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
 328
 329         /*
 330          * Avoid compat_sys_sigreturn() restarting.
 331          */
 332         regs->syscallno = ~0UL;
 333
 334         err |= !valid_user_regs(&regs->user_regs);
 335
 336         aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
 337         if (err == 0)
 338                 err |= compat_restore_vfp_context(&aux->vfp);
 339
 340         return err;
 341 }
 342
 343 asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
 344 {
 345         struct compat_sigframe __user *frame;
 346
 347         /* Always make any pending restarted system calls return -EINTR */
 348         current->restart_block.fn = do_no_restart_syscall;
 349
 350         /*
 351          * Since we stacked the signal on a 64-bit boundary,
 352          * then 'sp' should be word aligned here.  If it's
 353          * not, then the user is trying to mess with us.
 354          */
 355         if (regs->compat_sp & 7)
 356                 goto badframe;
 357
 358         frame = (struct compat_sigframe __user *)regs->compat_sp;
 359
 360         if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
 361                 goto badframe;
 362
 363         if (compat_restore_sigframe(regs, frame))
 364                 goto badframe;
 365
 366         return regs->regs[0];
 367
 368 badframe:
 369         if (show_unhandled_signals)
 370                 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
 371                                     current->comm, task_pid_nr(current), __func__,
 372                                     regs->pc, regs->compat_sp);
 373         force_sig(SIGSEGV, current);
 374         return 0;
 375 }
 376
 377 asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
 378 {
 379         struct compat_rt_sigframe __user *frame;
 380
 381         /* Always make any pending restarted system calls return -EINTR */
 382         current->restart_block.fn = do_no_restart_syscall;
 383
 384         /*
 385          * Since we stacked the signal on a 64-bit boundary,
 386          * then 'sp' should be word aligned here.  If it's
 387          * not, then the user is trying to mess with us.
 388          */
 389         if (regs->compat_sp & 7)
 390                 goto badframe;
 391
 392         frame = (struct compat_rt_sigframe __user *)regs->compat_sp;
 393
 394         if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
 395                 goto badframe;
 396
 397         if (compat_restore_sigframe(regs, &frame->sig))
 398                 goto badframe;
 399
 400         if (compat_restore_altstack(&frame->sig.uc.uc_stack))
 401                 goto badframe;
 402
 403         return regs->regs[0];
 404
 405 badframe:
 406         if (show_unhandled_signals)
 407                 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
 408                                     current->comm, task_pid_nr(current), __func__,
 409                                     regs->pc, regs->compat_sp);
 410         force_sig(SIGSEGV, current);
 411         return 0;
 412 }
 413
 414 static void __user *compat_get_sigframe(struct ksignal *ksig,
 415                                         struct pt_regs *regs,
 416                                         int framesize)
 417 {
 418         compat_ulong_t sp = sigsp(regs->compat_sp, ksig);
 419         void __user *frame;
 420
 421         /*
 422          * ATPCS B01 mandates 8-byte alignment
 423          */
 424         frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7));
 425
 426         /*
 427          * Check that we can actually write to the signal frame.
 428          */
 429         if (!access_ok(VERIFY_WRITE, frame, framesize))
 430                 frame = NULL;
 431
 432         return frame;
 433 }
 434
 435 static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka,
 436                                 compat_ulong_t __user *rc, void __user *frame,
 437                                 int usig)
 438 {
 439         compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
 440         compat_ulong_t retcode;
 441         compat_ulong_t spsr = regs->pstate & ~(PSR_f | COMPAT_PSR_E_BIT);
 442         int thumb;
 443
 444         /* Check if the handler is written for ARM or Thumb */
 445         thumb = handler & 1;
 446
 447         if (thumb)
 448                 spsr |= COMPAT_PSR_T_BIT;
 449         else
 450                 spsr &= ~COMPAT_PSR_T_BIT;
 451
 452         /* The IT state must be cleared for both ARM and Thumb-2 */
 453         spsr &= ~COMPAT_PSR_IT_MASK;
 454
 455         /* Restore the original endianness */
 456         spsr |= COMPAT_PSR_ENDSTATE;
 457
 458         if (ka->sa.sa_flags & SA_RESTORER) {
 459                 retcode = ptr_to_compat(ka->sa.sa_restorer);
 460         } else {
 461                 /* Set up sigreturn pointer */
 462                 unsigned int idx = thumb << 1;
 463
 464                 if (ka->sa.sa_flags & SA_SIGINFO)
 465                         idx += 3;
 466
 467                 retcode = AARCH32_VECTORS_BASE +
 468                           AARCH32_KERN_SIGRET_CODE_OFFSET +
 469                           (idx << 2) + thumb;
 470         }
 471
 472         regs->regs[0]   = usig;
 473         regs->compat_sp = ptr_to_compat(frame);
 474         regs->compat_lr = retcode;
 475         regs->pc        = handler;
 476         regs->pstate    = spsr;
 477 }
 478
 479 static int compat_setup_sigframe(struct compat_sigframe __user *sf,
 480                                  struct pt_regs *regs, sigset_t *set)
 481 {
 482         struct compat_aux_sigframe __user *aux;
 483         int err = 0;
 484
 485         __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
 486         __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
 487         __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
 488         __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
 489         __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
 490         __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
 491         __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
 492         __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
 493         __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
 494         __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
 495         __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
 496         __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
 497         __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
 498         __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
 499         __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
 500         __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
 501         __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
 502
 503         __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err);
 504         /* set the compat FSR WnR */
 505         __put_user_error(!!(current->thread.fault_code & ESR_ELx_WNR) <<
 506                          FSR_WRITE_SHIFT, &sf->uc.uc_mcontext.error_code, err);
 507         __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
 508         __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
 509
 510         err |= put_sigset_t(&sf->uc.uc_sigmask, set);
 511
 512         aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
 513
 514         if (err == 0)
 515                 err |= compat_preserve_vfp_context(&aux->vfp);
 516         __put_user_error(0, &aux->end_magic, err);
 517
 518         return err;
 519 }
 520
 521 /*
 522  * 32-bit signal handling routines called from signal.c
 523  */
 524 int compat_setup_rt_frame(int usig, struct ksignal *ksig,
 525                           sigset_t *set, struct pt_regs *regs)
 526 {
 527         struct compat_rt_sigframe __user *frame;
 528         int err = 0;
 529
 530         frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
 531
 532         if (!frame)
 533                 return 1;
 534
 535         err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
 536
 537         __put_user_error(0, &frame->sig.uc.uc_flags, err);
 538         __put_user_error(0, &frame->sig.uc.uc_link, err);
 539
 540         err |= __compat_save_altstack(&frame->sig.uc.uc_stack, regs->compat_sp);
 541
 542         err |= compat_setup_sigframe(&frame->sig, regs, set);
 543
 544         if (err == 0) {
 545                 compat_setup_return(regs, &ksig->ka, frame->sig.retcode, frame, usig);
 546                 regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info;
 547                 regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc;
 548         }
 549
 550         return err;
 551 }
 552
 553 int compat_setup_frame(int usig, struct ksignal *ksig, sigset_t *set,
 554                        struct pt_regs *regs)
 555 {
 556         struct compat_sigframe __user *frame;
 557         int err = 0;
 558
 559         frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
 560
 561         if (!frame)
 562                 return 1;
 563
 564         __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
 565
 566         err |= compat_setup_sigframe(frame, regs, set);
 567         if (err == 0)
 568                 compat_setup_return(regs, &ksig->ka, frame->retcode, frame, usig);
 569
 570         return err;
 571 }
 572
 573 void compat_setup_restart_syscall(struct pt_regs *regs)
 574 {
 575        regs->regs[7] = __NR_compat_restart_syscall;
 576 }