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 #define TARGET_CONFIG_CPU_32 1
 130
 131 /*
 132  * For ARM syscalls, we encode the syscall number into the instruction.
 133  */
 134 #define SWI_SYS_SIGRETURN       (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
 135 #define SWI_SYS_RT_SIGRETURN    (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
 136
 137 /*
 138  * For Thumb syscalls, we pass the syscall number via r7.  We therefore
 139  * need two 16-bit instructions.
 140  */
 141 #define SWI_THUMB_SIGRETURN     (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
 142 #define SWI_THUMB_RT_SIGRETURN  (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
 143
 144 static const abi_ulong retcodes[4] = {
 145         SWI_SYS_SIGRETURN,      SWI_THUMB_SIGRETURN,
 146         SWI_SYS_RT_SIGRETURN,   SWI_THUMB_RT_SIGRETURN
 147 };
 148
 149 /*
 150  * Stub needed to make sure the FD register (r9) contains the right
 151  * value.
 152  */
 153 static const unsigned long sigreturn_fdpic_codes[3] = {
 154     0xe59fc004, /* ldr r12, [pc, #4] to read function descriptor */
 155     0xe59c9004, /* ldr r9, [r12, #4] to setup GOT */
 156     0xe59cf000  /* ldr pc, [r12] to jump into restorer */
 157 };
 158
 159 static const unsigned long sigreturn_fdpic_thumb_codes[3] = {
 160     0xc008f8df, /* ldr r12, [pc, #8] to read function descriptor */
 161     0x9004f8dc, /* ldr r9, [r12, #4] to setup GOT */
 162     0xf000f8dc  /* ldr pc, [r12] to jump into restorer */
 163 };
 164
 165 static inline int valid_user_regs(CPUARMState *regs)
 166 {
 167     return 1;
 168 }
 169
 170 static void
 171 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
 172                  CPUARMState *env, abi_ulong mask)
 173 {
 174     __put_user(env->regs[0], &sc->arm_r0);
 175     __put_user(env->regs[1], &sc->arm_r1);
 176     __put_user(env->regs[2], &sc->arm_r2);
 177     __put_user(env->regs[3], &sc->arm_r3);
 178     __put_user(env->regs[4], &sc->arm_r4);
 179     __put_user(env->regs[5], &sc->arm_r5);
 180     __put_user(env->regs[6], &sc->arm_r6);
 181     __put_user(env->regs[7], &sc->arm_r7);
 182     __put_user(env->regs[8], &sc->arm_r8);
 183     __put_user(env->regs[9], &sc->arm_r9);
 184     __put_user(env->regs[10], &sc->arm_r10);
 185     __put_user(env->regs[11], &sc->arm_fp);
 186     __put_user(env->regs[12], &sc->arm_ip);
 187     __put_user(env->regs[13], &sc->arm_sp);
 188     __put_user(env->regs[14], &sc->arm_lr);
 189     __put_user(env->regs[15], &sc->arm_pc);
 190 #ifdef TARGET_CONFIG_CPU_32
 191     __put_user(cpsr_read(env), &sc->arm_cpsr);
 192 #endif
 193
 194     __put_user(/* current->thread.trap_no */ 0, &sc->trap_no);
 195     __put_user(/* current->thread.error_code */ 0, &sc->error_code);
 196     __put_user(/* current->thread.address */ 0, &sc->fault_address);
 197     __put_user(mask, &sc->oldmask);
 198 }
 199
 200 static inline abi_ulong
 201 get_sigframe(struct target_sigaction *ka, CPUARMState *regs, int framesize)
 202 {
 203     unsigned long sp;
 204
 205     sp = target_sigsp(get_sp_from_cpustate(regs), ka);
 206     /*
 207      * ATPCS B01 mandates 8-byte alignment
 208      */
 209     return (sp - framesize) & ~7;
 210 }
 211
 212 static int
 213 setup_return(CPUARMState *env, struct target_sigaction *ka,
 214              abi_ulong *rc, abi_ulong frame_addr, int usig, abi_ulong rc_addr)
 215 {
 216     abi_ulong handler = 0;
 217     abi_ulong handler_fdpic_GOT = 0;
 218     abi_ulong retcode;
 219
 220     int thumb;
 221     int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
 222
 223     if (is_fdpic) {
 224         /* In FDPIC mode, ka->_sa_handler points to a function
 225          * descriptor (FD). The first word contains the address of the
 226          * handler. The second word contains the value of the PIC
 227          * register (r9).  */
 228         abi_ulong funcdesc_ptr = ka->_sa_handler;
 229         if (get_user_ual(handler, funcdesc_ptr)
 230             || get_user_ual(handler_fdpic_GOT, funcdesc_ptr + 4)) {
 231             return 1;
 232         }
 233     } else {
 234         handler = ka->_sa_handler;
 235     }
 236
 237     thumb = handler & 1;
 238
 239     uint32_t cpsr = cpsr_read(env);
 240
 241     cpsr &= ~CPSR_IT;
 242     if (thumb) {
 243         cpsr |= CPSR_T;
 244     } else {
 245         cpsr &= ~CPSR_T;
 246     }
 247
 248     if (ka->sa_flags & TARGET_SA_RESTORER) {
 249         if (is_fdpic) {
 250             /* For FDPIC we ensure that the restorer is called with a
 251              * correct r9 value.  For that we need to write code on
 252              * the stack that sets r9 and jumps back to restorer
 253              * value.
 254              */
 255             if (thumb) {
 256                 __put_user(sigreturn_fdpic_thumb_codes[0], rc);
 257                 __put_user(sigreturn_fdpic_thumb_codes[1], rc + 1);
 258                 __put_user(sigreturn_fdpic_thumb_codes[2], rc + 2);
 259                 __put_user((abi_ulong)ka->sa_restorer, rc + 3);
 260             } else {
 261                 __put_user(sigreturn_fdpic_codes[0], rc);
 262                 __put_user(sigreturn_fdpic_codes[1], rc + 1);
 263                 __put_user(sigreturn_fdpic_codes[2], rc + 2);
 264                 __put_user((abi_ulong)ka->sa_restorer, rc + 3);
 265             }
 266
 267             retcode = rc_addr + thumb;
 268         } else {
 269             retcode = ka->sa_restorer;
 270         }
 271     } else {
 272         unsigned int idx = thumb;
 273
 274         if (ka->sa_flags & TARGET_SA_SIGINFO) {
 275             idx += 2;
 276         }
 277
 278         __put_user(retcodes[idx], rc);
 279
 280         retcode = rc_addr + thumb;
 281     }
 282
 283     env->regs[0] = usig;
 284     if (is_fdpic) {
 285         env->regs[9] = handler_fdpic_GOT;
 286     }
 287     env->regs[13] = frame_addr;
 288     env->regs[14] = retcode;
 289     env->regs[15] = handler & (thumb ? ~1 : ~3);
 290     cpsr_write(env, cpsr, CPSR_IT | CPSR_T, CPSRWriteByInstr);
 291
 292     return 0;
 293 }
 294
 295 static abi_ulong *setup_sigframe_v2_vfp(abi_ulong *regspace, CPUARMState *env)
 296 {
 297     int i;
 298     struct target_vfp_sigframe *vfpframe;
 299     vfpframe = (struct target_vfp_sigframe *)regspace;
 300     __put_user(TARGET_VFP_MAGIC, &vfpframe->magic);
 301     __put_user(sizeof(*vfpframe), &vfpframe->size);
 302     for (i = 0; i < 32; i++) {
 303         __put_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
 304     }
 305     __put_user(vfp_get_fpscr(env), &vfpframe->ufp.fpscr);
 306     __put_user(env->vfp.xregs[ARM_VFP_FPEXC], &vfpframe->ufp_exc.fpexc);
 307     __put_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
 308     __put_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
 309     return (abi_ulong*)(vfpframe+1);
 310 }
 311
 312 static abi_ulong *setup_sigframe_v2_iwmmxt(abi_ulong *regspace,
 313                                            CPUARMState *env)
 314 {
 315     int i;
 316     struct target_iwmmxt_sigframe *iwmmxtframe;
 317     iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
 318     __put_user(TARGET_IWMMXT_MAGIC, &iwmmxtframe->magic);
 319     __put_user(sizeof(*iwmmxtframe), &iwmmxtframe->size);
 320     for (i = 0; i < 16; i++) {
 321         __put_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
 322     }
 323     __put_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
 324     __put_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
 325     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
 326     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
 327     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
 328     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
 329     return (abi_ulong*)(iwmmxtframe+1);
 330 }
 331
 332 static void setup_sigframe_v2(struct target_ucontext_v2 *uc,
 333                               target_sigset_t *set, CPUARMState *env)
 334 {
 335     struct target_sigaltstack stack;
 336     int i;
 337     abi_ulong *regspace;
 338
 339     /* Clear all the bits of the ucontext we don't use.  */
 340     memset(uc, 0, offsetof(struct target_ucontext_v2, tuc_mcontext));
 341
 342     memset(&stack, 0, sizeof(stack));
 343     target_save_altstack(&stack, env);
 344     memcpy(&uc->tuc_stack, &stack, sizeof(stack));
 345
 346     setup_sigcontext(&uc->tuc_mcontext, env, set->sig[0]);
 347     /* Save coprocessor signal frame.  */
 348     regspace = uc->tuc_regspace;
 349     if (arm_feature(env, ARM_FEATURE_VFP)) {
 350         regspace = setup_sigframe_v2_vfp(regspace, env);
 351     }
 352     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
 353         regspace = setup_sigframe_v2_iwmmxt(regspace, env);
 354     }
 355
 356     /* Write terminating magic word */
 357     __put_user(0, regspace);
 358
 359     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
 360         __put_user(set->sig[i], &uc->tuc_sigmask.sig[i]);
 361     }
 362 }
 363
 364 /* compare linux/arch/arm/kernel/signal.c:setup_frame() */
 365 static void setup_frame_v1(int usig, struct target_sigaction *ka,
 366                            target_sigset_t *set, CPUARMState *regs)
 367 {
 368     struct sigframe_v1 *frame;
 369     abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
 370     int i;
 371
 372     trace_user_setup_frame(regs, frame_addr);
 373     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 374         goto sigsegv;
 375     }
 376
 377     setup_sigcontext(&frame->sc, regs, set->sig[0]);
 378
 379     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 380         __put_user(set->sig[i], &frame->extramask[i - 1]);
 381     }
 382
 383     if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
 384                      frame_addr + offsetof(struct sigframe_v1, retcode))) {
 385         goto sigsegv;
 386     }
 387
 388     unlock_user_struct(frame, frame_addr, 1);
 389     return;
 390 sigsegv:
 391     unlock_user_struct(frame, frame_addr, 1);
 392     force_sigsegv(usig);
 393 }
 394
 395 static void setup_frame_v2(int usig, struct target_sigaction *ka,
 396                            target_sigset_t *set, CPUARMState *regs)
 397 {
 398     struct sigframe_v2 *frame;
 399     abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
 400
 401     trace_user_setup_frame(regs, frame_addr);
 402     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 403         goto sigsegv;
 404     }
 405
 406     setup_sigframe_v2(&frame->uc, set, regs);
 407
 408     if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
 409                      frame_addr + offsetof(struct sigframe_v2, retcode))) {
 410         goto sigsegv;
 411     }
 412
 413     unlock_user_struct(frame, frame_addr, 1);
 414     return;
 415 sigsegv:
 416     unlock_user_struct(frame, frame_addr, 1);
 417     force_sigsegv(usig);
 418 }
 419
 420 void setup_frame(int usig, struct target_sigaction *ka,
 421                  target_sigset_t *set, CPUARMState *regs)
 422 {
 423     if (get_osversion() >= 0x020612) {
 424         setup_frame_v2(usig, ka, set, regs);
 425     } else {
 426         setup_frame_v1(usig, ka, set, regs);
 427     }
 428 }
 429
 430 /* compare linux/arch/arm/kernel/signal.c:setup_rt_frame() */
 431 static void setup_rt_frame_v1(int usig, struct target_sigaction *ka,
 432                               target_siginfo_t *info,
 433                               target_sigset_t *set, CPUARMState *env)
 434 {
 435     struct rt_sigframe_v1 *frame;
 436     abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
 437     struct target_sigaltstack stack;
 438     int i;
 439     abi_ulong info_addr, uc_addr;
 440
 441     trace_user_setup_rt_frame(env, frame_addr);
 442     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 443         goto sigsegv;
 444     }
 445
 446     info_addr = frame_addr + offsetof(struct rt_sigframe_v1, info);
 447     __put_user(info_addr, &frame->pinfo);
 448     uc_addr = frame_addr + offsetof(struct rt_sigframe_v1, uc);
 449     __put_user(uc_addr, &frame->puc);
 450     tswap_siginfo(&frame->info, info);
 451
 452     /* Clear all the bits of the ucontext we don't use.  */
 453     memset(&frame->uc, 0, offsetof(struct target_ucontext_v1, tuc_mcontext));
 454
 455     memset(&stack, 0, sizeof(stack));
 456     target_save_altstack(&stack, env);
 457     memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack));
 458
 459     setup_sigcontext(&frame->uc.tuc_mcontext, env, set->sig[0]);
 460     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
 461         __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
 462     }
 463
 464     if (setup_return(env, ka, frame->retcode, frame_addr, usig,
 465                      frame_addr + offsetof(struct rt_sigframe_v1, retcode))) {
 466         goto sigsegv;
 467     }
 468
 469     env->regs[1] = info_addr;
 470     env->regs[2] = uc_addr;
 471
 472     unlock_user_struct(frame, frame_addr, 1);
 473     return;
 474 sigsegv:
 475     unlock_user_struct(frame, frame_addr, 1);
 476     force_sigsegv(usig);
 477 }
 478
 479 static void setup_rt_frame_v2(int usig, struct target_sigaction *ka,
 480                               target_siginfo_t *info,
 481                               target_sigset_t *set, CPUARMState *env)
 482 {
 483     struct rt_sigframe_v2 *frame;
 484     abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
 485     abi_ulong info_addr, uc_addr;
 486
 487     trace_user_setup_rt_frame(env, frame_addr);
 488     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 489         goto sigsegv;
 490     }
 491
 492     info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info);
 493     uc_addr = frame_addr + offsetof(struct rt_sigframe_v2, uc);
 494     tswap_siginfo(&frame->info, info);
 495
 496     setup_sigframe_v2(&frame->uc, set, env);
 497
 498     if (setup_return(env, ka, frame->retcode, frame_addr, usig,
 499                      frame_addr + offsetof(struct rt_sigframe_v2, retcode))) {
 500         goto sigsegv;
 501     }
 502
 503     env->regs[1] = info_addr;
 504     env->regs[2] = uc_addr;
 505
 506     unlock_user_struct(frame, frame_addr, 1);
 507     return;
 508 sigsegv:
 509     unlock_user_struct(frame, frame_addr, 1);
 510     force_sigsegv(usig);
 511 }
 512
 513 void setup_rt_frame(int usig, struct target_sigaction *ka,
 514                     target_siginfo_t *info,
 515                     target_sigset_t *set, CPUARMState *env)
 516 {
 517     if (get_osversion() >= 0x020612) {
 518         setup_rt_frame_v2(usig, ka, info, set, env);
 519     } else {
 520         setup_rt_frame_v1(usig, ka, info, set, env);
 521     }
 522 }
 523
 524 static int
 525 restore_sigcontext(CPUARMState *env, struct target_sigcontext *sc)
 526 {
 527     int err = 0;
 528     uint32_t cpsr;
 529
 530     __get_user(env->regs[0], &sc->arm_r0);
 531     __get_user(env->regs[1], &sc->arm_r1);
 532     __get_user(env->regs[2], &sc->arm_r2);
 533     __get_user(env->regs[3], &sc->arm_r3);
 534     __get_user(env->regs[4], &sc->arm_r4);
 535     __get_user(env->regs[5], &sc->arm_r5);
 536     __get_user(env->regs[6], &sc->arm_r6);
 537     __get_user(env->regs[7], &sc->arm_r7);
 538     __get_user(env->regs[8], &sc->arm_r8);
 539     __get_user(env->regs[9], &sc->arm_r9);
 540     __get_user(env->regs[10], &sc->arm_r10);
 541     __get_user(env->regs[11], &sc->arm_fp);
 542     __get_user(env->regs[12], &sc->arm_ip);
 543     __get_user(env->regs[13], &sc->arm_sp);
 544     __get_user(env->regs[14], &sc->arm_lr);
 545     __get_user(env->regs[15], &sc->arm_pc);
 546 #ifdef TARGET_CONFIG_CPU_32
 547     __get_user(cpsr, &sc->arm_cpsr);
 548     cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr);
 549 #endif
 550
 551     err |= !valid_user_regs(env);
 552
 553     return err;
 554 }
 555
 556 static long do_sigreturn_v1(CPUARMState *env)
 557 {
 558     abi_ulong frame_addr;
 559     struct sigframe_v1 *frame = NULL;
 560     target_sigset_t set;
 561     sigset_t host_set;
 562     int i;
 563
 564     /*
 565      * Since we stacked the signal on a 64-bit boundary,
 566      * then 'sp' should be word aligned here.  If it's
 567      * not, then the user is trying to mess with us.
 568      */
 569     frame_addr = env->regs[13];
 570     trace_user_do_sigreturn(env, frame_addr);
 571     if (frame_addr & 7) {
 572         goto badframe;
 573     }
 574
 575     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 576         goto badframe;
 577     }
 578
 579     __get_user(set.sig[0], &frame->sc.oldmask);
 580     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 581         __get_user(set.sig[i], &frame->extramask[i - 1]);
 582     }
 583
 584     target_to_host_sigset_internal(&host_set, &set);
 585     set_sigmask(&host_set);
 586
 587     if (restore_sigcontext(env, &frame->sc)) {
 588         goto badframe;
 589     }
 590
 591 #if 0
 592     /* Send SIGTRAP if we're single-stepping */
 593     if (ptrace_cancel_bpt(current))
 594         send_sig(SIGTRAP, current, 1);
 595 #endif
 596     unlock_user_struct(frame, frame_addr, 0);
 597     return -TARGET_QEMU_ESIGRETURN;
 598
 599 badframe:
 600     force_sig(TARGET_SIGSEGV);
 601     return -TARGET_QEMU_ESIGRETURN;
 602 }
 603
 604 static abi_ulong *restore_sigframe_v2_vfp(CPUARMState *env, abi_ulong *regspace)
 605 {
 606     int i;
 607     abi_ulong magic, sz;
 608     uint32_t fpscr, fpexc;
 609     struct target_vfp_sigframe *vfpframe;
 610     vfpframe = (struct target_vfp_sigframe *)regspace;
 611
 612     __get_user(magic, &vfpframe->magic);
 613     __get_user(sz, &vfpframe->size);
 614     if (magic != TARGET_VFP_MAGIC || sz != sizeof(*vfpframe)) {
 615         return 0;
 616     }
 617     for (i = 0; i < 32; i++) {
 618         __get_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
 619     }
 620     __get_user(fpscr, &vfpframe->ufp.fpscr);
 621     vfp_set_fpscr(env, fpscr);
 622     __get_user(fpexc, &vfpframe->ufp_exc.fpexc);
 623     /* Sanitise FPEXC: ensure VFP is enabled, FPINST2 is invalid
 624      * and the exception flag is cleared
 625      */
 626     fpexc |= (1 << 30);
 627     fpexc &= ~((1 << 31) | (1 << 28));
 628     env->vfp.xregs[ARM_VFP_FPEXC] = fpexc;
 629     __get_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
 630     __get_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
 631     return (abi_ulong*)(vfpframe + 1);
 632 }
 633
 634 static abi_ulong *restore_sigframe_v2_iwmmxt(CPUARMState *env,
 635                                              abi_ulong *regspace)
 636 {
 637     int i;
 638     abi_ulong magic, sz;
 639     struct target_iwmmxt_sigframe *iwmmxtframe;
 640     iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
 641
 642     __get_user(magic, &iwmmxtframe->magic);
 643     __get_user(sz, &iwmmxtframe->size);
 644     if (magic != TARGET_IWMMXT_MAGIC || sz != sizeof(*iwmmxtframe)) {
 645         return 0;
 646     }
 647     for (i = 0; i < 16; i++) {
 648         __get_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
 649     }
 650     __get_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
 651     __get_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
 652     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
 653     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
 654     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
 655     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
 656     return (abi_ulong*)(iwmmxtframe + 1);
 657 }
 658
 659 static int do_sigframe_return_v2(CPUARMState *env,
 660                                  target_ulong context_addr,
 661                                  struct target_ucontext_v2 *uc)
 662 {
 663     sigset_t host_set;
 664     abi_ulong *regspace;
 665
 666     target_to_host_sigset(&host_set, &uc->tuc_sigmask);
 667     set_sigmask(&host_set);
 668
 669     if (restore_sigcontext(env, &uc->tuc_mcontext))
 670         return 1;
 671
 672     /* Restore coprocessor signal frame */
 673     regspace = uc->tuc_regspace;
 674     if (arm_feature(env, ARM_FEATURE_VFP)) {
 675         regspace = restore_sigframe_v2_vfp(env, regspace);
 676         if (!regspace) {
 677             return 1;
 678         }
 679     }
 680     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
 681         regspace = restore_sigframe_v2_iwmmxt(env, regspace);
 682         if (!regspace) {
 683             return 1;
 684         }
 685     }
 686
 687     if (do_sigaltstack(context_addr
 688                        + offsetof(struct target_ucontext_v2, tuc_stack),
 689                        0, get_sp_from_cpustate(env)) == -EFAULT) {
 690         return 1;
 691     }
 692
 693 #if 0
 694     /* Send SIGTRAP if we're single-stepping */
 695     if (ptrace_cancel_bpt(current))
 696         send_sig(SIGTRAP, current, 1);
 697 #endif
 698
 699     return 0;
 700 }
 701
 702 static long do_sigreturn_v2(CPUARMState *env)
 703 {
 704     abi_ulong frame_addr;
 705     struct sigframe_v2 *frame = NULL;
 706
 707     /*
 708      * Since we stacked the signal on a 64-bit boundary,
 709      * then 'sp' should be word aligned here.  If it's
 710      * not, then the user is trying to mess with us.
 711      */
 712     frame_addr = env->regs[13];
 713     trace_user_do_sigreturn(env, frame_addr);
 714     if (frame_addr & 7) {
 715         goto badframe;
 716     }
 717
 718     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 719         goto badframe;
 720     }
 721
 722     if (do_sigframe_return_v2(env,
 723                               frame_addr
 724                               + offsetof(struct sigframe_v2, uc),
 725                               &frame->uc)) {
 726         goto badframe;
 727     }
 728
 729     unlock_user_struct(frame, frame_addr, 0);
 730     return -TARGET_QEMU_ESIGRETURN;
 731
 732 badframe:
 733     unlock_user_struct(frame, frame_addr, 0);
 734     force_sig(TARGET_SIGSEGV);
 735     return -TARGET_QEMU_ESIGRETURN;
 736 }
 737
 738 long do_sigreturn(CPUARMState *env)
 739 {
 740     if (get_osversion() >= 0x020612) {
 741         return do_sigreturn_v2(env);
 742     } else {
 743         return do_sigreturn_v1(env);
 744     }
 745 }
 746
 747 static long do_rt_sigreturn_v1(CPUARMState *env)
 748 {
 749     abi_ulong frame_addr;
 750     struct rt_sigframe_v1 *frame = NULL;
 751     sigset_t host_set;
 752
 753     /*
 754      * Since we stacked the signal on a 64-bit boundary,
 755      * then 'sp' should be word aligned here.  If it's
 756      * not, then the user is trying to mess with us.
 757      */
 758     frame_addr = env->regs[13];
 759     trace_user_do_rt_sigreturn(env, frame_addr);
 760     if (frame_addr & 7) {
 761         goto badframe;
 762     }
 763
 764     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 765         goto badframe;
 766     }
 767
 768     target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
 769     set_sigmask(&host_set);
 770
 771     if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) {
 772         goto badframe;
 773     }
 774
 775     if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe_v1, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT)
 776         goto badframe;
 777
 778 #if 0
 779     /* Send SIGTRAP if we're single-stepping */
 780     if (ptrace_cancel_bpt(current))
 781         send_sig(SIGTRAP, current, 1);
 782 #endif
 783     unlock_user_struct(frame, frame_addr, 0);
 784     return -TARGET_QEMU_ESIGRETURN;
 785
 786 badframe:
 787     unlock_user_struct(frame, frame_addr, 0);
 788     force_sig(TARGET_SIGSEGV);
 789     return -TARGET_QEMU_ESIGRETURN;
 790 }
 791
 792 static long do_rt_sigreturn_v2(CPUARMState *env)
 793 {
 794     abi_ulong frame_addr;
 795     struct rt_sigframe_v2 *frame = NULL;
 796
 797     /*
 798      * Since we stacked the signal on a 64-bit boundary,
 799      * then 'sp' should be word aligned here.  If it's
 800      * not, then the user is trying to mess with us.
 801      */
 802     frame_addr = env->regs[13];
 803     trace_user_do_rt_sigreturn(env, frame_addr);
 804     if (frame_addr & 7) {
 805         goto badframe;
 806     }
 807
 808     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 809         goto badframe;
 810     }
 811
 812     if (do_sigframe_return_v2(env,
 813                               frame_addr
 814                               + offsetof(struct rt_sigframe_v2, uc),
 815                               &frame->uc)) {
 816         goto badframe;
 817     }
 818
 819     unlock_user_struct(frame, frame_addr, 0);
 820     return -TARGET_QEMU_ESIGRETURN;
 821
 822 badframe:
 823     unlock_user_struct(frame, frame_addr, 0);
 824     force_sig(TARGET_SIGSEGV);
 825     return -TARGET_QEMU_ESIGRETURN;
 826 }
 827
 828 long do_rt_sigreturn(CPUARMState *env)
 829 {
 830     if (get_osversion() >= 0x020612) {
 831         return do_rt_sigreturn_v2(env);
 832     } else {
 833         return do_rt_sigreturn_v1(env);
 834     }
 835 }