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     arm_rebuild_hflags(env);
 293
 294     return 0;
 295 }
 296
 297 static abi_ulong *setup_sigframe_v2_vfp(abi_ulong *regspace, CPUARMState *env)
 298 {
 299     int i;
 300     struct target_vfp_sigframe *vfpframe;
 301     vfpframe = (struct target_vfp_sigframe *)regspace;
 302     __put_user(TARGET_VFP_MAGIC, &vfpframe->magic);
 303     __put_user(sizeof(*vfpframe), &vfpframe->size);
 304     for (i = 0; i < 32; i++) {
 305         __put_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
 306     }
 307     __put_user(vfp_get_fpscr(env), &vfpframe->ufp.fpscr);
 308     __put_user(env->vfp.xregs[ARM_VFP_FPEXC], &vfpframe->ufp_exc.fpexc);
 309     __put_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
 310     __put_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
 311     return (abi_ulong*)(vfpframe+1);
 312 }
 313
 314 static abi_ulong *setup_sigframe_v2_iwmmxt(abi_ulong *regspace,
 315                                            CPUARMState *env)
 316 {
 317     int i;
 318     struct target_iwmmxt_sigframe *iwmmxtframe;
 319     iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
 320     __put_user(TARGET_IWMMXT_MAGIC, &iwmmxtframe->magic);
 321     __put_user(sizeof(*iwmmxtframe), &iwmmxtframe->size);
 322     for (i = 0; i < 16; i++) {
 323         __put_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
 324     }
 325     __put_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
 326     __put_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
 327     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
 328     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
 329     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
 330     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
 331     return (abi_ulong*)(iwmmxtframe+1);
 332 }
 333
 334 static void setup_sigframe_v2(struct target_ucontext_v2 *uc,
 335                               target_sigset_t *set, CPUARMState *env)
 336 {
 337     struct target_sigaltstack stack;
 338     int i;
 339     abi_ulong *regspace;
 340
 341     /* Clear all the bits of the ucontext we don't use.  */
 342     memset(uc, 0, offsetof(struct target_ucontext_v2, tuc_mcontext));
 343
 344     memset(&stack, 0, sizeof(stack));
 345     target_save_altstack(&stack, env);
 346     memcpy(&uc->tuc_stack, &stack, sizeof(stack));
 347
 348     setup_sigcontext(&uc->tuc_mcontext, env, set->sig[0]);
 349     /* Save coprocessor signal frame.  */
 350     regspace = uc->tuc_regspace;
 351     if (cpu_isar_feature(aa32_vfp_simd, env_archcpu(env))) {
 352         regspace = setup_sigframe_v2_vfp(regspace, env);
 353     }
 354     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
 355         regspace = setup_sigframe_v2_iwmmxt(regspace, env);
 356     }
 357
 358     /* Write terminating magic word */
 359     __put_user(0, regspace);
 360
 361     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
 362         __put_user(set->sig[i], &uc->tuc_sigmask.sig[i]);
 363     }
 364 }
 365
 366 /* compare linux/arch/arm/kernel/signal.c:setup_frame() */
 367 static void setup_frame_v1(int usig, struct target_sigaction *ka,
 368                            target_sigset_t *set, CPUARMState *regs)
 369 {
 370     struct sigframe_v1 *frame;
 371     abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
 372     int i;
 373
 374     trace_user_setup_frame(regs, frame_addr);
 375     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 376         goto sigsegv;
 377     }
 378
 379     setup_sigcontext(&frame->sc, regs, set->sig[0]);
 380
 381     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 382         __put_user(set->sig[i], &frame->extramask[i - 1]);
 383     }
 384
 385     if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
 386                      frame_addr + offsetof(struct sigframe_v1, retcode))) {
 387         goto sigsegv;
 388     }
 389
 390     unlock_user_struct(frame, frame_addr, 1);
 391     return;
 392 sigsegv:
 393     unlock_user_struct(frame, frame_addr, 1);
 394     force_sigsegv(usig);
 395 }
 396
 397 static void setup_frame_v2(int usig, struct target_sigaction *ka,
 398                            target_sigset_t *set, CPUARMState *regs)
 399 {
 400     struct sigframe_v2 *frame;
 401     abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
 402
 403     trace_user_setup_frame(regs, frame_addr);
 404     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 405         goto sigsegv;
 406     }
 407
 408     setup_sigframe_v2(&frame->uc, set, regs);
 409
 410     if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
 411                      frame_addr + offsetof(struct sigframe_v2, retcode))) {
 412         goto sigsegv;
 413     }
 414
 415     unlock_user_struct(frame, frame_addr, 1);
 416     return;
 417 sigsegv:
 418     unlock_user_struct(frame, frame_addr, 1);
 419     force_sigsegv(usig);
 420 }
 421
 422 void setup_frame(int usig, struct target_sigaction *ka,
 423                  target_sigset_t *set, CPUARMState *regs)
 424 {
 425     if (get_osversion() >= 0x020612) {
 426         setup_frame_v2(usig, ka, set, regs);
 427     } else {
 428         setup_frame_v1(usig, ka, set, regs);
 429     }
 430 }
 431
 432 /* compare linux/arch/arm/kernel/signal.c:setup_rt_frame() */
 433 static void setup_rt_frame_v1(int usig, struct target_sigaction *ka,
 434                               target_siginfo_t *info,
 435                               target_sigset_t *set, CPUARMState *env)
 436 {
 437     struct rt_sigframe_v1 *frame;
 438     abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
 439     struct target_sigaltstack stack;
 440     int i;
 441     abi_ulong info_addr, uc_addr;
 442
 443     trace_user_setup_rt_frame(env, frame_addr);
 444     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 445         goto sigsegv;
 446     }
 447
 448     info_addr = frame_addr + offsetof(struct rt_sigframe_v1, info);
 449     __put_user(info_addr, &frame->pinfo);
 450     uc_addr = frame_addr + offsetof(struct rt_sigframe_v1, uc);
 451     __put_user(uc_addr, &frame->puc);
 452     tswap_siginfo(&frame->info, info);
 453
 454     /* Clear all the bits of the ucontext we don't use.  */
 455     memset(&frame->uc, 0, offsetof(struct target_ucontext_v1, tuc_mcontext));
 456
 457     memset(&stack, 0, sizeof(stack));
 458     target_save_altstack(&stack, env);
 459     memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack));
 460
 461     setup_sigcontext(&frame->uc.tuc_mcontext, env, set->sig[0]);
 462     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
 463         __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
 464     }
 465
 466     if (setup_return(env, ka, frame->retcode, frame_addr, usig,
 467                      frame_addr + offsetof(struct rt_sigframe_v1, retcode))) {
 468         goto sigsegv;
 469     }
 470
 471     env->regs[1] = info_addr;
 472     env->regs[2] = uc_addr;
 473
 474     unlock_user_struct(frame, frame_addr, 1);
 475     return;
 476 sigsegv:
 477     unlock_user_struct(frame, frame_addr, 1);
 478     force_sigsegv(usig);
 479 }
 480
 481 static void setup_rt_frame_v2(int usig, struct target_sigaction *ka,
 482                               target_siginfo_t *info,
 483                               target_sigset_t *set, CPUARMState *env)
 484 {
 485     struct rt_sigframe_v2 *frame;
 486     abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
 487     abi_ulong info_addr, uc_addr;
 488
 489     trace_user_setup_rt_frame(env, frame_addr);
 490     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 491         goto sigsegv;
 492     }
 493
 494     info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info);
 495     uc_addr = frame_addr + offsetof(struct rt_sigframe_v2, uc);
 496     tswap_siginfo(&frame->info, info);
 497
 498     setup_sigframe_v2(&frame->uc, set, env);
 499
 500     if (setup_return(env, ka, frame->retcode, frame_addr, usig,
 501                      frame_addr + offsetof(struct rt_sigframe_v2, retcode))) {
 502         goto sigsegv;
 503     }
 504
 505     env->regs[1] = info_addr;
 506     env->regs[2] = uc_addr;
 507
 508     unlock_user_struct(frame, frame_addr, 1);
 509     return;
 510 sigsegv:
 511     unlock_user_struct(frame, frame_addr, 1);
 512     force_sigsegv(usig);
 513 }
 514
 515 void setup_rt_frame(int usig, struct target_sigaction *ka,
 516                     target_siginfo_t *info,
 517                     target_sigset_t *set, CPUARMState *env)
 518 {
 519     if (get_osversion() >= 0x020612) {
 520         setup_rt_frame_v2(usig, ka, info, set, env);
 521     } else {
 522         setup_rt_frame_v1(usig, ka, info, set, env);
 523     }
 524 }
 525
 526 static int
 527 restore_sigcontext(CPUARMState *env, struct target_sigcontext *sc)
 528 {
 529     int err = 0;
 530     uint32_t cpsr;
 531
 532     __get_user(env->regs[0], &sc->arm_r0);
 533     __get_user(env->regs[1], &sc->arm_r1);
 534     __get_user(env->regs[2], &sc->arm_r2);
 535     __get_user(env->regs[3], &sc->arm_r3);
 536     __get_user(env->regs[4], &sc->arm_r4);
 537     __get_user(env->regs[5], &sc->arm_r5);
 538     __get_user(env->regs[6], &sc->arm_r6);
 539     __get_user(env->regs[7], &sc->arm_r7);
 540     __get_user(env->regs[8], &sc->arm_r8);
 541     __get_user(env->regs[9], &sc->arm_r9);
 542     __get_user(env->regs[10], &sc->arm_r10);
 543     __get_user(env->regs[11], &sc->arm_fp);
 544     __get_user(env->regs[12], &sc->arm_ip);
 545     __get_user(env->regs[13], &sc->arm_sp);
 546     __get_user(env->regs[14], &sc->arm_lr);
 547     __get_user(env->regs[15], &sc->arm_pc);
 548     __get_user(cpsr, &sc->arm_cpsr);
 549     cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr);
 550     arm_rebuild_hflags(env);
 551
 552     err |= !valid_user_regs(env);
 553
 554     return err;
 555 }
 556
 557 static long do_sigreturn_v1(CPUARMState *env)
 558 {
 559     abi_ulong frame_addr;
 560     struct sigframe_v1 *frame = NULL;
 561     target_sigset_t set;
 562     sigset_t host_set;
 563     int i;
 564
 565     /*
 566      * Since we stacked the signal on a 64-bit boundary,
 567      * then 'sp' should be word aligned here.  If it's
 568      * not, then the user is trying to mess with us.
 569      */
 570     frame_addr = env->regs[13];
 571     trace_user_do_sigreturn(env, frame_addr);
 572     if (frame_addr & 7) {
 573         goto badframe;
 574     }
 575
 576     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 577         goto badframe;
 578     }
 579
 580     __get_user(set.sig[0], &frame->sc.oldmask);
 581     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 582         __get_user(set.sig[i], &frame->extramask[i - 1]);
 583     }
 584
 585     target_to_host_sigset_internal(&host_set, &set);
 586     set_sigmask(&host_set);
 587
 588     if (restore_sigcontext(env, &frame->sc)) {
 589         goto badframe;
 590     }
 591
 592 #if 0
 593     /* Send SIGTRAP if we're single-stepping */
 594     if (ptrace_cancel_bpt(current))
 595         send_sig(SIGTRAP, current, 1);
 596 #endif
 597     unlock_user_struct(frame, frame_addr, 0);
 598     return -TARGET_QEMU_ESIGRETURN;
 599
 600 badframe:
 601     force_sig(TARGET_SIGSEGV);
 602     return -TARGET_QEMU_ESIGRETURN;
 603 }
 604
 605 static abi_ulong *restore_sigframe_v2_vfp(CPUARMState *env, abi_ulong *regspace)
 606 {
 607     int i;
 608     abi_ulong magic, sz;
 609     uint32_t fpscr, fpexc;
 610     struct target_vfp_sigframe *vfpframe;
 611     vfpframe = (struct target_vfp_sigframe *)regspace;
 612
 613     __get_user(magic, &vfpframe->magic);
 614     __get_user(sz, &vfpframe->size);
 615     if (magic != TARGET_VFP_MAGIC || sz != sizeof(*vfpframe)) {
 616         return 0;
 617     }
 618     for (i = 0; i < 32; i++) {
 619         __get_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
 620     }
 621     __get_user(fpscr, &vfpframe->ufp.fpscr);
 622     vfp_set_fpscr(env, fpscr);
 623     __get_user(fpexc, &vfpframe->ufp_exc.fpexc);
 624     /* Sanitise FPEXC: ensure VFP is enabled, FPINST2 is invalid
 625      * and the exception flag is cleared
 626      */
 627     fpexc |= (1 << 30);
 628     fpexc &= ~((1 << 31) | (1 << 28));
 629     env->vfp.xregs[ARM_VFP_FPEXC] = fpexc;
 630     __get_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
 631     __get_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
 632     return (abi_ulong*)(vfpframe + 1);
 633 }
 634
 635 static abi_ulong *restore_sigframe_v2_iwmmxt(CPUARMState *env,
 636                                              abi_ulong *regspace)
 637 {
 638     int i;
 639     abi_ulong magic, sz;
 640     struct target_iwmmxt_sigframe *iwmmxtframe;
 641     iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
 642
 643     __get_user(magic, &iwmmxtframe->magic);
 644     __get_user(sz, &iwmmxtframe->size);
 645     if (magic != TARGET_IWMMXT_MAGIC || sz != sizeof(*iwmmxtframe)) {
 646         return 0;
 647     }
 648     for (i = 0; i < 16; i++) {
 649         __get_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
 650     }
 651     __get_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
 652     __get_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
 653     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
 654     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
 655     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
 656     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
 657     return (abi_ulong*)(iwmmxtframe + 1);
 658 }
 659
 660 static int do_sigframe_return_v2(CPUARMState *env,
 661                                  target_ulong context_addr,
 662                                  struct target_ucontext_v2 *uc)
 663 {
 664     sigset_t host_set;
 665     abi_ulong *regspace;
 666
 667     target_to_host_sigset(&host_set, &uc->tuc_sigmask);
 668     set_sigmask(&host_set);
 669
 670     if (restore_sigcontext(env, &uc->tuc_mcontext))
 671         return 1;
 672
 673     /* Restore coprocessor signal frame */
 674     regspace = uc->tuc_regspace;
 675     if (cpu_isar_feature(aa32_vfp_simd, env_archcpu(env))) {
 676         regspace = restore_sigframe_v2_vfp(env, regspace);
 677         if (!regspace) {
 678             return 1;
 679         }
 680     }
 681     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
 682         regspace = restore_sigframe_v2_iwmmxt(env, regspace);
 683         if (!regspace) {
 684             return 1;
 685         }
 686     }
 687
 688     target_restore_altstack(&uc->tuc_stack, env);
 689
 690 #if 0
 691     /* Send SIGTRAP if we're single-stepping */
 692     if (ptrace_cancel_bpt(current))
 693         send_sig(SIGTRAP, current, 1);
 694 #endif
 695
 696     return 0;
 697 }
 698
 699 static long do_sigreturn_v2(CPUARMState *env)
 700 {
 701     abi_ulong frame_addr;
 702     struct sigframe_v2 *frame = NULL;
 703
 704     /*
 705      * Since we stacked the signal on a 64-bit boundary,
 706      * then 'sp' should be word aligned here.  If it's
 707      * not, then the user is trying to mess with us.
 708      */
 709     frame_addr = env->regs[13];
 710     trace_user_do_sigreturn(env, frame_addr);
 711     if (frame_addr & 7) {
 712         goto badframe;
 713     }
 714
 715     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 716         goto badframe;
 717     }
 718
 719     if (do_sigframe_return_v2(env,
 720                               frame_addr
 721                               + offsetof(struct sigframe_v2, uc),
 722                               &frame->uc)) {
 723         goto badframe;
 724     }
 725
 726     unlock_user_struct(frame, frame_addr, 0);
 727     return -TARGET_QEMU_ESIGRETURN;
 728
 729 badframe:
 730     unlock_user_struct(frame, frame_addr, 0);
 731     force_sig(TARGET_SIGSEGV);
 732     return -TARGET_QEMU_ESIGRETURN;
 733 }
 734
 735 long do_sigreturn(CPUARMState *env)
 736 {
 737     if (get_osversion() >= 0x020612) {
 738         return do_sigreturn_v2(env);
 739     } else {
 740         return do_sigreturn_v1(env);
 741     }
 742 }
 743
 744 static long do_rt_sigreturn_v1(CPUARMState *env)
 745 {
 746     abi_ulong frame_addr;
 747     struct rt_sigframe_v1 *frame = NULL;
 748     sigset_t host_set;
 749
 750     /*
 751      * Since we stacked the signal on a 64-bit boundary,
 752      * then 'sp' should be word aligned here.  If it's
 753      * not, then the user is trying to mess with us.
 754      */
 755     frame_addr = env->regs[13];
 756     trace_user_do_rt_sigreturn(env, frame_addr);
 757     if (frame_addr & 7) {
 758         goto badframe;
 759     }
 760
 761     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 762         goto badframe;
 763     }
 764
 765     target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
 766     set_sigmask(&host_set);
 767
 768     if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) {
 769         goto badframe;
 770     }
 771
 772     target_restore_altstack(&frame->uc.tuc_stack, env);
 773
 774 #if 0
 775     /* Send SIGTRAP if we're single-stepping */
 776     if (ptrace_cancel_bpt(current))
 777         send_sig(SIGTRAP, current, 1);
 778 #endif
 779     unlock_user_struct(frame, frame_addr, 0);
 780     return -TARGET_QEMU_ESIGRETURN;
 781
 782 badframe:
 783     unlock_user_struct(frame, frame_addr, 0);
 784     force_sig(TARGET_SIGSEGV);
 785     return -TARGET_QEMU_ESIGRETURN;
 786 }
 787
 788 static long do_rt_sigreturn_v2(CPUARMState *env)
 789 {
 790     abi_ulong frame_addr;
 791     struct rt_sigframe_v2 *frame = NULL;
 792
 793     /*
 794      * Since we stacked the signal on a 64-bit boundary,
 795      * then 'sp' should be word aligned here.  If it's
 796      * not, then the user is trying to mess with us.
 797      */
 798     frame_addr = env->regs[13];
 799     trace_user_do_rt_sigreturn(env, frame_addr);
 800     if (frame_addr & 7) {
 801         goto badframe;
 802     }
 803
 804     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 805         goto badframe;
 806     }
 807
 808     if (do_sigframe_return_v2(env,
 809                               frame_addr
 810                               + offsetof(struct rt_sigframe_v2, uc),
 811                               &frame->uc)) {
 812         goto badframe;
 813     }
 814
 815     unlock_user_struct(frame, frame_addr, 0);
 816     return -TARGET_QEMU_ESIGRETURN;
 817
 818 badframe:
 819     unlock_user_struct(frame, frame_addr, 0);
 820     force_sig(TARGET_SIGSEGV);
 821     return -TARGET_QEMU_ESIGRETURN;
 822 }
 823
 824 long do_rt_sigreturn(CPUARMState *env)
 825 {
 826     if (get_osversion() >= 0x020612) {
 827         return do_rt_sigreturn_v2(env);
 828     } else {
 829         return do_rt_sigreturn_v1(env);
 830     }
 831 }