linux-user/arm/signal.c

   1 /*
   2  *  Emulation of Linux signals
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "qemu/osdep.h"
  20 #include "qemu.h"
  21 #include "signal-common.h"
  22 #include "linux-user/trace.h"
  23
  24 struct target_sigcontext {
  25     abi_ulong trap_no;
  26     abi_ulong error_code;
  27     abi_ulong oldmask;
  28     abi_ulong arm_r0;
  29     abi_ulong arm_r1;
  30     abi_ulong arm_r2;
  31     abi_ulong arm_r3;
  32     abi_ulong arm_r4;
  33     abi_ulong arm_r5;
  34     abi_ulong arm_r6;
  35     abi_ulong arm_r7;
  36     abi_ulong arm_r8;
  37     abi_ulong arm_r9;
  38     abi_ulong arm_r10;
  39     abi_ulong arm_fp;
  40     abi_ulong arm_ip;
  41     abi_ulong arm_sp;
  42     abi_ulong arm_lr;
  43     abi_ulong arm_pc;
  44     abi_ulong arm_cpsr;
  45     abi_ulong fault_address;
  46 };
  47
  48 struct target_ucontext_v1 {
  49     abi_ulong tuc_flags;
  50     abi_ulong tuc_link;
  51     target_stack_t tuc_stack;
  52     struct target_sigcontext tuc_mcontext;
  53     target_sigset_t  tuc_sigmask;       /* mask last for extensibility */
  54 };
  55
  56 struct target_ucontext_v2 {
  57     abi_ulong tuc_flags;
  58     abi_ulong tuc_link;
  59     target_stack_t tuc_stack;
  60     struct target_sigcontext tuc_mcontext;
  61     target_sigset_t  tuc_sigmask;       /* mask last for extensibility */
  62     char __unused[128 - sizeof(target_sigset_t)];
  63     abi_ulong tuc_regspace[128] __attribute__((__aligned__(8)));
  64 };
  65
  66 struct target_user_vfp {
  67     uint64_t fpregs[32];
  68     abi_ulong fpscr;
  69 };
  70
  71 struct target_user_vfp_exc {
  72     abi_ulong fpexc;
  73     abi_ulong fpinst;
  74     abi_ulong fpinst2;
  75 };
  76
  77 struct target_vfp_sigframe {
  78     abi_ulong magic;
  79     abi_ulong size;
  80     struct target_user_vfp ufp;
  81     struct target_user_vfp_exc ufp_exc;
  82 } __attribute__((__aligned__(8)));
  83
  84 struct target_iwmmxt_sigframe {
  85     abi_ulong magic;
  86     abi_ulong size;
  87     uint64_t regs[16];
  88     /* Note that not all the coprocessor control registers are stored here */
  89     uint32_t wcssf;
  90     uint32_t wcasf;
  91     uint32_t wcgr0;
  92     uint32_t wcgr1;
  93     uint32_t wcgr2;
  94     uint32_t wcgr3;
  95 } __attribute__((__aligned__(8)));
  96
  97 #define TARGET_VFP_MAGIC 0x56465001
  98 #define TARGET_IWMMXT_MAGIC 0x12ef842a
  99
 100 struct sigframe_v1
 101 {
 102     struct target_sigcontext sc;
 103     abi_ulong extramask[TARGET_NSIG_WORDS-1];
 104     abi_ulong retcode[4];
 105 };
 106
 107 struct sigframe_v2
 108 {
 109     struct target_ucontext_v2 uc;
 110     abi_ulong retcode[4];
 111 };
 112
 113 struct rt_sigframe_v1
 114 {
 115     abi_ulong pinfo;
 116     abi_ulong puc;
 117     struct target_siginfo info;
 118     struct target_ucontext_v1 uc;
 119     abi_ulong retcode[4];
 120 };
 121
 122 struct rt_sigframe_v2
 123 {
 124     struct target_siginfo info;
 125     struct target_ucontext_v2 uc;
 126     abi_ulong retcode[4];
 127 };
 128
 129 /*
 130  * For ARM syscalls, we encode the syscall number into the instruction.
 131  */
 132 #define SWI_SYS_SIGRETURN       (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
 133 #define SWI_SYS_RT_SIGRETURN    (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
 134
 135 /*
 136  * For Thumb syscalls, we pass the syscall number via r7.  We therefore
 137  * need two 16-bit instructions.
 138  */
 139 #define SWI_THUMB_SIGRETURN     (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
 140 #define SWI_THUMB_RT_SIGRETURN  (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
 141
 142 static const abi_ulong retcodes[4] = {
 143         SWI_SYS_SIGRETURN,      SWI_THUMB_SIGRETURN,
 144         SWI_SYS_RT_SIGRETURN,   SWI_THUMB_RT_SIGRETURN
 145 };
 146
 147 /*
 148  * Stub needed to make sure the FD register (r9) contains the right
 149  * value.
 150  */
 151 static const unsigned long sigreturn_fdpic_codes[3] = {
 152     0xe59fc004, /* ldr r12, [pc, #4] to read function descriptor */
 153     0xe59c9004, /* ldr r9, [r12, #4] to setup GOT */
 154     0xe59cf000  /* ldr pc, [r12] to jump into restorer */
 155 };
 156
 157 static const unsigned long sigreturn_fdpic_thumb_codes[3] = {
 158     0xc008f8df, /* ldr r12, [pc, #8] to read function descriptor */
 159     0x9004f8dc, /* ldr r9, [r12, #4] to setup GOT */
 160     0xf000f8dc  /* ldr pc, [r12] to jump into restorer */
 161 };
 162
 163 static inline int valid_user_regs(CPUARMState *regs)
 164 {
 165     return 1;
 166 }
 167
 168 static void
 169 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
 170                  CPUARMState *env, abi_ulong mask)
 171 {
 172     __put_user(env->regs[0], &sc->arm_r0);
 173     __put_user(env->regs[1], &sc->arm_r1);
 174     __put_user(env->regs[2], &sc->arm_r2);
 175     __put_user(env->regs[3], &sc->arm_r3);
 176     __put_user(env->regs[4], &sc->arm_r4);
 177     __put_user(env->regs[5], &sc->arm_r5);
 178     __put_user(env->regs[6], &sc->arm_r6);
 179     __put_user(env->regs[7], &sc->arm_r7);
 180     __put_user(env->regs[8], &sc->arm_r8);
 181     __put_user(env->regs[9], &sc->arm_r9);
 182     __put_user(env->regs[10], &sc->arm_r10);
 183     __put_user(env->regs[11], &sc->arm_fp);
 184     __put_user(env->regs[12], &sc->arm_ip);
 185     __put_user(env->regs[13], &sc->arm_sp);
 186     __put_user(env->regs[14], &sc->arm_lr);
 187     __put_user(env->regs[15], &sc->arm_pc);
 188     __put_user(cpsr_read(env), &sc->arm_cpsr);
 189
 190     __put_user(/* current->thread.trap_no */ 0, &sc->trap_no);
 191     __put_user(/* current->thread.error_code */ 0, &sc->error_code);
 192     __put_user(/* current->thread.address */ 0, &sc->fault_address);
 193     __put_user(mask, &sc->oldmask);
 194 }
 195
 196 static inline abi_ulong
 197 get_sigframe(struct target_sigaction *ka, CPUARMState *regs, int framesize)
 198 {
 199     unsigned long sp;
 200
 201     sp = target_sigsp(get_sp_from_cpustate(regs), ka);
 202     /*
 203      * ATPCS B01 mandates 8-byte alignment
 204      */
 205     return (sp - framesize) & ~7;
 206 }
 207
 208 static int
 209 setup_return(CPUARMState *env, struct target_sigaction *ka,
 210              abi_ulong *rc, abi_ulong frame_addr, int usig, abi_ulong rc_addr)
 211 {
 212     abi_ulong handler = 0;
 213     abi_ulong handler_fdpic_GOT = 0;
 214     abi_ulong retcode;
 215
 216     int thumb;
 217     int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
 218
 219     if (is_fdpic) {
 220         /* In FDPIC mode, ka->_sa_handler points to a function
 221          * descriptor (FD). The first word contains the address of the
 222          * handler. The second word contains the value of the PIC
 223          * register (r9).  */
 224         abi_ulong funcdesc_ptr = ka->_sa_handler;
 225         if (get_user_ual(handler, funcdesc_ptr)
 226             || get_user_ual(handler_fdpic_GOT, funcdesc_ptr + 4)) {
 227             return 1;
 228         }
 229     } else {
 230         handler = ka->_sa_handler;
 231     }
 232
 233     thumb = handler & 1;
 234
 235     uint32_t cpsr = cpsr_read(env);
 236
 237     cpsr &= ~CPSR_IT;
 238     if (thumb) {
 239         cpsr |= CPSR_T;
 240     } else {
 241         cpsr &= ~CPSR_T;
 242     }
 243     if (env->cp15.sctlr_el[1] & SCTLR_E0E) {
 244         cpsr |= CPSR_E;
 245     } else {
 246         cpsr &= ~CPSR_E;
 247     }
 248
 249     if (ka->sa_flags & TARGET_SA_RESTORER) {
 250         if (is_fdpic) {
 251             /* For FDPIC we ensure that the restorer is called with a
 252              * correct r9 value.  For that we need to write code on
 253              * the stack that sets r9 and jumps back to restorer
 254              * value.
 255              */
 256             if (thumb) {
 257                 __put_user(sigreturn_fdpic_thumb_codes[0], rc);
 258                 __put_user(sigreturn_fdpic_thumb_codes[1], rc + 1);
 259                 __put_user(sigreturn_fdpic_thumb_codes[2], rc + 2);
 260                 __put_user((abi_ulong)ka->sa_restorer, rc + 3);
 261             } else {
 262                 __put_user(sigreturn_fdpic_codes[0], rc);
 263                 __put_user(sigreturn_fdpic_codes[1], rc + 1);
 264                 __put_user(sigreturn_fdpic_codes[2], rc + 2);
 265                 __put_user((abi_ulong)ka->sa_restorer, rc + 3);
 266             }
 267
 268             retcode = rc_addr + thumb;
 269         } else {
 270             retcode = ka->sa_restorer;
 271         }
 272     } else {
 273         unsigned int idx = thumb;
 274
 275         if (ka->sa_flags & TARGET_SA_SIGINFO) {
 276             idx += 2;
 277         }
 278
 279         __put_user(retcodes[idx], rc);
 280
 281         retcode = rc_addr + thumb;
 282     }
 283
 284     env->regs[0] = usig;
 285     if (is_fdpic) {
 286         env->regs[9] = handler_fdpic_GOT;
 287     }
 288     env->regs[13] = frame_addr;
 289     env->regs[14] = retcode;
 290     env->regs[15] = handler & (thumb ? ~1 : ~3);
 291     cpsr_write(env, cpsr, CPSR_IT | CPSR_T | CPSR_E, CPSRWriteByInstr);
 292
 293     return 0;
 294 }
 295
 296 static abi_ulong *setup_sigframe_v2_vfp(abi_ulong *regspace, CPUARMState *env)
 297 {
 298     int i;
 299     struct target_vfp_sigframe *vfpframe;
 300     vfpframe = (struct target_vfp_sigframe *)regspace;
 301     __put_user(TARGET_VFP_MAGIC, &vfpframe->magic);
 302     __put_user(sizeof(*vfpframe), &vfpframe->size);
 303     for (i = 0; i < 32; i++) {
 304         __put_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
 305     }
 306     __put_user(vfp_get_fpscr(env), &vfpframe->ufp.fpscr);
 307     __put_user(env->vfp.xregs[ARM_VFP_FPEXC], &vfpframe->ufp_exc.fpexc);
 308     __put_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
 309     __put_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
 310     return (abi_ulong*)(vfpframe+1);
 311 }
 312
 313 static abi_ulong *setup_sigframe_v2_iwmmxt(abi_ulong *regspace,
 314                                            CPUARMState *env)
 315 {
 316     int i;
 317     struct target_iwmmxt_sigframe *iwmmxtframe;
 318     iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
 319     __put_user(TARGET_IWMMXT_MAGIC, &iwmmxtframe->magic);
 320     __put_user(sizeof(*iwmmxtframe), &iwmmxtframe->size);
 321     for (i = 0; i < 16; i++) {
 322         __put_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
 323     }
 324     __put_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
 325     __put_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
 326     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
 327     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
 328     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
 329     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
 330     return (abi_ulong*)(iwmmxtframe+1);
 331 }
 332
 333 static void setup_sigframe_v2(struct target_ucontext_v2 *uc,
 334                               target_sigset_t *set, CPUARMState *env)
 335 {
 336     struct target_sigaltstack stack;
 337     int i;
 338     abi_ulong *regspace;
 339
 340     /* Clear all the bits of the ucontext we don't use.  */
 341     memset(uc, 0, offsetof(struct target_ucontext_v2, tuc_mcontext));
 342
 343     memset(&stack, 0, sizeof(stack));
 344     target_save_altstack(&stack, env);
 345     memcpy(&uc->tuc_stack, &stack, sizeof(stack));
 346
 347     setup_sigcontext(&uc->tuc_mcontext, env, set->sig[0]);
 348     /* Save coprocessor signal frame.  */
 349     regspace = uc->tuc_regspace;
 350     if (cpu_isar_feature(aa32_vfp_simd, env_archcpu(env))) {
 351         regspace = setup_sigframe_v2_vfp(regspace, env);
 352     }
 353     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
 354         regspace = setup_sigframe_v2_iwmmxt(regspace, env);
 355     }
 356
 357     /* Write terminating magic word */
 358     __put_user(0, regspace);
 359
 360     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
 361         __put_user(set->sig[i], &uc->tuc_sigmask.sig[i]);
 362     }
 363 }
 364
 365 /* compare linux/arch/arm/kernel/signal.c:setup_frame() */
 366 static void setup_frame_v1(int usig, struct target_sigaction *ka,
 367                            target_sigset_t *set, CPUARMState *regs)
 368 {
 369     struct sigframe_v1 *frame;
 370     abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
 371     int i;
 372
 373     trace_user_setup_frame(regs, frame_addr);
 374     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 375         goto sigsegv;
 376     }
 377
 378     setup_sigcontext(&frame->sc, regs, set->sig[0]);
 379
 380     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 381         __put_user(set->sig[i], &frame->extramask[i - 1]);
 382     }
 383
 384     if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
 385                      frame_addr + offsetof(struct sigframe_v1, retcode))) {
 386         goto sigsegv;
 387     }
 388
 389     unlock_user_struct(frame, frame_addr, 1);
 390     return;
 391 sigsegv:
 392     unlock_user_struct(frame, frame_addr, 1);
 393     force_sigsegv(usig);
 394 }
 395
 396 static void setup_frame_v2(int usig, struct target_sigaction *ka,
 397                            target_sigset_t *set, CPUARMState *regs)
 398 {
 399     struct sigframe_v2 *frame;
 400     abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
 401
 402     trace_user_setup_frame(regs, frame_addr);
 403     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 404         goto sigsegv;
 405     }
 406
 407     setup_sigframe_v2(&frame->uc, set, regs);
 408
 409     if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
 410                      frame_addr + offsetof(struct sigframe_v2, retcode))) {
 411         goto sigsegv;
 412     }
 413
 414     unlock_user_struct(frame, frame_addr, 1);
 415     return;
 416 sigsegv:
 417     unlock_user_struct(frame, frame_addr, 1);
 418     force_sigsegv(usig);
 419 }
 420
 421 void setup_frame(int usig, struct target_sigaction *ka,
 422                  target_sigset_t *set, CPUARMState *regs)
 423 {
 424     if (get_osversion() >= 0x020612) {
 425         setup_frame_v2(usig, ka, set, regs);
 426     } else {
 427         setup_frame_v1(usig, ka, set, regs);
 428     }
 429 }
 430
 431 /* compare linux/arch/arm/kernel/signal.c:setup_rt_frame() */
 432 static void setup_rt_frame_v1(int usig, struct target_sigaction *ka,
 433                               target_siginfo_t *info,
 434                               target_sigset_t *set, CPUARMState *env)
 435 {
 436     struct rt_sigframe_v1 *frame;
 437     abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
 438     struct target_sigaltstack stack;
 439     int i;
 440     abi_ulong info_addr, uc_addr;
 441
 442     trace_user_setup_rt_frame(env, frame_addr);
 443     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 444         goto sigsegv;
 445     }
 446
 447     info_addr = frame_addr + offsetof(struct rt_sigframe_v1, info);
 448     __put_user(info_addr, &frame->pinfo);
 449     uc_addr = frame_addr + offsetof(struct rt_sigframe_v1, uc);
 450     __put_user(uc_addr, &frame->puc);
 451     tswap_siginfo(&frame->info, info);
 452
 453     /* Clear all the bits of the ucontext we don't use.  */
 454     memset(&frame->uc, 0, offsetof(struct target_ucontext_v1, tuc_mcontext));
 455
 456     memset(&stack, 0, sizeof(stack));
 457     target_save_altstack(&stack, env);
 458     memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack));
 459
 460     setup_sigcontext(&frame->uc.tuc_mcontext, env, set->sig[0]);
 461     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
 462         __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
 463     }
 464
 465     if (setup_return(env, ka, frame->retcode, frame_addr, usig,
 466                      frame_addr + offsetof(struct rt_sigframe_v1, retcode))) {
 467         goto sigsegv;
 468     }
 469
 470     env->regs[1] = info_addr;
 471     env->regs[2] = uc_addr;
 472
 473     unlock_user_struct(frame, frame_addr, 1);
 474     return;
 475 sigsegv:
 476     unlock_user_struct(frame, frame_addr, 1);
 477     force_sigsegv(usig);
 478 }
 479
 480 static void setup_rt_frame_v2(int usig, struct target_sigaction *ka,
 481                               target_siginfo_t *info,
 482                               target_sigset_t *set, CPUARMState *env)
 483 {
 484     struct rt_sigframe_v2 *frame;
 485     abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
 486     abi_ulong info_addr, uc_addr;
 487
 488     trace_user_setup_rt_frame(env, frame_addr);
 489     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 490         goto sigsegv;
 491     }
 492
 493     info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info);
 494     uc_addr = frame_addr + offsetof(struct rt_sigframe_v2, uc);
 495     tswap_siginfo(&frame->info, info);
 496
 497     setup_sigframe_v2(&frame->uc, set, env);
 498
 499     if (setup_return(env, ka, frame->retcode, frame_addr, usig,
 500                      frame_addr + offsetof(struct rt_sigframe_v2, retcode))) {
 501         goto sigsegv;
 502     }
 503
 504     env->regs[1] = info_addr;
 505     env->regs[2] = uc_addr;
 506
 507     unlock_user_struct(frame, frame_addr, 1);
 508     return;
 509 sigsegv:
 510     unlock_user_struct(frame, frame_addr, 1);
 511     force_sigsegv(usig);
 512 }
 513
 514 void setup_rt_frame(int usig, struct target_sigaction *ka,
 515                     target_siginfo_t *info,
 516                     target_sigset_t *set, CPUARMState *env)
 517 {
 518     if (get_osversion() >= 0x020612) {
 519         setup_rt_frame_v2(usig, ka, info, set, env);
 520     } else {
 521         setup_rt_frame_v1(usig, ka, info, set, env);
 522     }
 523 }
 524
 525 static int
 526 restore_sigcontext(CPUARMState *env, struct target_sigcontext *sc)
 527 {
 528     int err = 0;
 529     uint32_t cpsr;
 530
 531     __get_user(env->regs[0], &sc->arm_r0);
 532     __get_user(env->regs[1], &sc->arm_r1);
 533     __get_user(env->regs[2], &sc->arm_r2);
 534     __get_user(env->regs[3], &sc->arm_r3);
 535     __get_user(env->regs[4], &sc->arm_r4);
 536     __get_user(env->regs[5], &sc->arm_r5);
 537     __get_user(env->regs[6], &sc->arm_r6);
 538     __get_user(env->regs[7], &sc->arm_r7);
 539     __get_user(env->regs[8], &sc->arm_r8);
 540     __get_user(env->regs[9], &sc->arm_r9);
 541     __get_user(env->regs[10], &sc->arm_r10);
 542     __get_user(env->regs[11], &sc->arm_fp);
 543     __get_user(env->regs[12], &sc->arm_ip);
 544     __get_user(env->regs[13], &sc->arm_sp);
 545     __get_user(env->regs[14], &sc->arm_lr);
 546     __get_user(env->regs[15], &sc->arm_pc);
 547     __get_user(cpsr, &sc->arm_cpsr);
 548     cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr);
 549
 550     err |= !valid_user_regs(env);
 551
 552     return err;
 553 }
 554
 555 static long do_sigreturn_v1(CPUARMState *env)
 556 {
 557     abi_ulong frame_addr;
 558     struct sigframe_v1 *frame = NULL;
 559     target_sigset_t set;
 560     sigset_t host_set;
 561     int i;
 562
 563     /*
 564      * Since we stacked the signal on a 64-bit boundary,
 565      * then 'sp' should be word aligned here.  If it's
 566      * not, then the user is trying to mess with us.
 567      */
 568     frame_addr = env->regs[13];
 569     trace_user_do_sigreturn(env, frame_addr);
 570     if (frame_addr & 7) {
 571         goto badframe;
 572     }
 573
 574     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 575         goto badframe;
 576     }
 577
 578     __get_user(set.sig[0], &frame->sc.oldmask);
 579     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 580         __get_user(set.sig[i], &frame->extramask[i - 1]);
 581     }
 582
 583     target_to_host_sigset_internal(&host_set, &set);
 584     set_sigmask(&host_set);
 585
 586     if (restore_sigcontext(env, &frame->sc)) {
 587         goto badframe;
 588     }
 589
 590 #if 0
 591     /* Send SIGTRAP if we're single-stepping */
 592     if (ptrace_cancel_bpt(current))
 593         send_sig(SIGTRAP, current, 1);
 594 #endif
 595     unlock_user_struct(frame, frame_addr, 0);
 596     return -TARGET_QEMU_ESIGRETURN;
 597
 598 badframe:
 599     force_sig(TARGET_SIGSEGV);
 600     return -TARGET_QEMU_ESIGRETURN;
 601 }
 602
 603 static abi_ulong *restore_sigframe_v2_vfp(CPUARMState *env, abi_ulong *regspace)
 604 {
 605     int i;
 606     abi_ulong magic, sz;
 607     uint32_t fpscr, fpexc;
 608     struct target_vfp_sigframe *vfpframe;
 609     vfpframe = (struct target_vfp_sigframe *)regspace;
 610
 611     __get_user(magic, &vfpframe->magic);
 612     __get_user(sz, &vfpframe->size);
 613     if (magic != TARGET_VFP_MAGIC || sz != sizeof(*vfpframe)) {
 614         return 0;
 615     }
 616     for (i = 0; i < 32; i++) {
 617         __get_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
 618     }
 619     __get_user(fpscr, &vfpframe->ufp.fpscr);
 620     vfp_set_fpscr(env, fpscr);
 621     __get_user(fpexc, &vfpframe->ufp_exc.fpexc);
 622     /* Sanitise FPEXC: ensure VFP is enabled, FPINST2 is invalid
 623      * and the exception flag is cleared
 624      */
 625     fpexc |= (1 << 30);
 626     fpexc &= ~((1 << 31) | (1 << 28));
 627     env->vfp.xregs[ARM_VFP_FPEXC] = fpexc;
 628     __get_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
 629     __get_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
 630     return (abi_ulong*)(vfpframe + 1);
 631 }
 632
 633 static abi_ulong *restore_sigframe_v2_iwmmxt(CPUARMState *env,
 634                                              abi_ulong *regspace)
 635 {
 636     int i;
 637     abi_ulong magic, sz;
 638     struct target_iwmmxt_sigframe *iwmmxtframe;
 639     iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
 640
 641     __get_user(magic, &iwmmxtframe->magic);
 642     __get_user(sz, &iwmmxtframe->size);
 643     if (magic != TARGET_IWMMXT_MAGIC || sz != sizeof(*iwmmxtframe)) {
 644         return 0;
 645     }
 646     for (i = 0; i < 16; i++) {
 647         __get_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
 648     }
 649     __get_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
 650     __get_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
 651     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
 652     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
 653     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
 654     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
 655     return (abi_ulong*)(iwmmxtframe + 1);
 656 }
 657
 658 static int do_sigframe_return_v2(CPUARMState *env,
 659                                  target_ulong context_addr,
 660                                  struct target_ucontext_v2 *uc)
 661 {
 662     sigset_t host_set;
 663     abi_ulong *regspace;
 664
 665     target_to_host_sigset(&host_set, &uc->tuc_sigmask);
 666     set_sigmask(&host_set);
 667
 668     if (restore_sigcontext(env, &uc->tuc_mcontext))
 669         return 1;
 670
 671     /* Restore coprocessor signal frame */
 672     regspace = uc->tuc_regspace;
 673     if (cpu_isar_feature(aa32_vfp_simd, env_archcpu(env))) {
 674         regspace = restore_sigframe_v2_vfp(env, regspace);
 675         if (!regspace) {
 676             return 1;
 677         }
 678     }
 679     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
 680         regspace = restore_sigframe_v2_iwmmxt(env, regspace);
 681         if (!regspace) {
 682             return 1;
 683         }
 684     }
 685
 686     target_restore_altstack(&uc->tuc_stack, env);
 687
 688 #if 0
 689     /* Send SIGTRAP if we're single-stepping */
 690     if (ptrace_cancel_bpt(current))
 691         send_sig(SIGTRAP, current, 1);
 692 #endif
 693
 694     return 0;
 695 }
 696
 697 static long do_sigreturn_v2(CPUARMState *env)
 698 {
 699     abi_ulong frame_addr;
 700     struct sigframe_v2 *frame = NULL;
 701
 702     /*
 703      * Since we stacked the signal on a 64-bit boundary,
 704      * then 'sp' should be word aligned here.  If it's
 705      * not, then the user is trying to mess with us.
 706      */
 707     frame_addr = env->regs[13];
 708     trace_user_do_sigreturn(env, frame_addr);
 709     if (frame_addr & 7) {
 710         goto badframe;
 711     }
 712
 713     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 714         goto badframe;
 715     }
 716
 717     if (do_sigframe_return_v2(env,
 718                               frame_addr
 719                               + offsetof(struct sigframe_v2, uc),
 720                               &frame->uc)) {
 721         goto badframe;
 722     }
 723
 724     unlock_user_struct(frame, frame_addr, 0);
 725     return -TARGET_QEMU_ESIGRETURN;
 726
 727 badframe:
 728     unlock_user_struct(frame, frame_addr, 0);
 729     force_sig(TARGET_SIGSEGV);
 730     return -TARGET_QEMU_ESIGRETURN;
 731 }
 732
 733 long do_sigreturn(CPUARMState *env)
 734 {
 735     if (get_osversion() >= 0x020612) {
 736         return do_sigreturn_v2(env);
 737     } else {
 738         return do_sigreturn_v1(env);
 739     }
 740 }
 741
 742 static long do_rt_sigreturn_v1(CPUARMState *env)
 743 {
 744     abi_ulong frame_addr;
 745     struct rt_sigframe_v1 *frame = NULL;
 746     sigset_t host_set;
 747
 748     /*
 749      * Since we stacked the signal on a 64-bit boundary,
 750      * then 'sp' should be word aligned here.  If it's
 751      * not, then the user is trying to mess with us.
 752      */
 753     frame_addr = env->regs[13];
 754     trace_user_do_rt_sigreturn(env, frame_addr);
 755     if (frame_addr & 7) {
 756         goto badframe;
 757     }
 758
 759     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 760         goto badframe;
 761     }
 762
 763     target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
 764     set_sigmask(&host_set);
 765
 766     if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) {
 767         goto badframe;
 768     }
 769
 770     target_restore_altstack(&frame->uc.tuc_stack, env);
 771
 772 #if 0
 773     /* Send SIGTRAP if we're single-stepping */
 774     if (ptrace_cancel_bpt(current))
 775         send_sig(SIGTRAP, current, 1);
 776 #endif
 777     unlock_user_struct(frame, frame_addr, 0);
 778     return -TARGET_QEMU_ESIGRETURN;
 779
 780 badframe:
 781     unlock_user_struct(frame, frame_addr, 0);
 782     force_sig(TARGET_SIGSEGV);
 783     return -TARGET_QEMU_ESIGRETURN;
 784 }
 785
 786 static long do_rt_sigreturn_v2(CPUARMState *env)
 787 {
 788     abi_ulong frame_addr;
 789     struct rt_sigframe_v2 *frame = NULL;
 790
 791     /*
 792      * Since we stacked the signal on a 64-bit boundary,
 793      * then 'sp' should be word aligned here.  If it's
 794      * not, then the user is trying to mess with us.
 795      */
 796     frame_addr = env->regs[13];
 797     trace_user_do_rt_sigreturn(env, frame_addr);
 798     if (frame_addr & 7) {
 799         goto badframe;
 800     }
 801
 802     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 803         goto badframe;
 804     }
 805
 806     if (do_sigframe_return_v2(env,
 807                               frame_addr
 808                               + offsetof(struct rt_sigframe_v2, uc),
 809                               &frame->uc)) {
 810         goto badframe;
 811     }
 812
 813     unlock_user_struct(frame, frame_addr, 0);
 814     return -TARGET_QEMU_ESIGRETURN;
 815
 816 badframe:
 817     unlock_user_struct(frame, frame_addr, 0);
 818     force_sig(TARGET_SIGSEGV);
 819     return -TARGET_QEMU_ESIGRETURN;
 820 }
 821
 822 long do_rt_sigreturn(CPUARMState *env)
 823 {
 824     if (get_osversion() >= 0x020612) {
 825         return do_rt_sigreturn_v2(env);
 826     } else {
 827         return do_rt_sigreturn_v1(env);
 828     }
 829 }