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 if (do_sigaltstack(context_addr 689 + offsetof(struct target_ucontext_v2, tuc_stack), 690 0, get_sp_from_cpustate(env)) == -EFAULT) { 691 return 1; 692 } 693 694 #if 0 695 /* Send SIGTRAP if we're single-stepping */ 696 if (ptrace_cancel_bpt(current)) 697 send_sig(SIGTRAP, current, 1); 698 #endif 699 700 return 0; 701 } 702 703 static long do_sigreturn_v2(CPUARMState *env) 704 { 705 abi_ulong frame_addr; 706 struct sigframe_v2 *frame = NULL; 707 708 /* 709 * Since we stacked the signal on a 64-bit boundary, 710 * then 'sp' should be word aligned here. If it's 711 * not, then the user is trying to mess with us. 712 */ 713 frame_addr = env->regs[13]; 714 trace_user_do_sigreturn(env, frame_addr); 715 if (frame_addr & 7) { 716 goto badframe; 717 } 718 719 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { 720 goto badframe; 721 } 722 723 if (do_sigframe_return_v2(env, 724 frame_addr 725 + offsetof(struct sigframe_v2, uc), 726 &frame->uc)) { 727 goto badframe; 728 } 729 730 unlock_user_struct(frame, frame_addr, 0); 731 return -TARGET_QEMU_ESIGRETURN; 732 733 badframe: 734 unlock_user_struct(frame, frame_addr, 0); 735 force_sig(TARGET_SIGSEGV); 736 return -TARGET_QEMU_ESIGRETURN; 737 } 738 739 long do_sigreturn(CPUARMState *env) 740 { 741 if (get_osversion() >= 0x020612) { 742 return do_sigreturn_v2(env); 743 } else { 744 return do_sigreturn_v1(env); 745 } 746 } 747 748 static long do_rt_sigreturn_v1(CPUARMState *env) 749 { 750 abi_ulong frame_addr; 751 struct rt_sigframe_v1 *frame = NULL; 752 sigset_t host_set; 753 754 /* 755 * Since we stacked the signal on a 64-bit boundary, 756 * then 'sp' should be word aligned here. If it's 757 * not, then the user is trying to mess with us. 758 */ 759 frame_addr = env->regs[13]; 760 trace_user_do_rt_sigreturn(env, frame_addr); 761 if (frame_addr & 7) { 762 goto badframe; 763 } 764 765 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { 766 goto badframe; 767 } 768 769 target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask); 770 set_sigmask(&host_set); 771 772 if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) { 773 goto badframe; 774 } 775 776 if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe_v1, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) 777 goto badframe; 778 779 #if 0 780 /* Send SIGTRAP if we're single-stepping */ 781 if (ptrace_cancel_bpt(current)) 782 send_sig(SIGTRAP, current, 1); 783 #endif 784 unlock_user_struct(frame, frame_addr, 0); 785 return -TARGET_QEMU_ESIGRETURN; 786 787 badframe: 788 unlock_user_struct(frame, frame_addr, 0); 789 force_sig(TARGET_SIGSEGV); 790 return -TARGET_QEMU_ESIGRETURN; 791 } 792 793 static long do_rt_sigreturn_v2(CPUARMState *env) 794 { 795 abi_ulong frame_addr; 796 struct rt_sigframe_v2 *frame = NULL; 797 798 /* 799 * Since we stacked the signal on a 64-bit boundary, 800 * then 'sp' should be word aligned here. If it's 801 * not, then the user is trying to mess with us. 802 */ 803 frame_addr = env->regs[13]; 804 trace_user_do_rt_sigreturn(env, frame_addr); 805 if (frame_addr & 7) { 806 goto badframe; 807 } 808 809 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { 810 goto badframe; 811 } 812 813 if (do_sigframe_return_v2(env, 814 frame_addr 815 + offsetof(struct rt_sigframe_v2, uc), 816 &frame->uc)) { 817 goto badframe; 818 } 819 820 unlock_user_struct(frame, frame_addr, 0); 821 return -TARGET_QEMU_ESIGRETURN; 822 823 badframe: 824 unlock_user_struct(frame, frame_addr, 0); 825 force_sig(TARGET_SIGSEGV); 826 return -TARGET_QEMU_ESIGRETURN; 827 } 828 829 long do_rt_sigreturn(CPUARMState *env) 830 { 831 if (get_osversion() >= 0x020612) { 832 return do_rt_sigreturn_v2(env); 833 } else { 834 return do_rt_sigreturn_v1(env); 835 } 836 } 837