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 /* Size of dummy stack frame allocated when calling signal handler. 25 See arch/powerpc/include/asm/ptrace.h. */ 26 #if defined(TARGET_PPC64) 27 #define SIGNAL_FRAMESIZE 128 28 #else 29 #define SIGNAL_FRAMESIZE 64 30 #endif 31 32 /* See arch/powerpc/include/asm/ucontext.h. Only used for 32-bit PPC; 33 on 64-bit PPC, sigcontext and mcontext are one and the same. */ 34 struct target_mcontext { 35 target_ulong mc_gregs[48]; 36 /* Includes fpscr. */ 37 uint64_t mc_fregs[33]; 38 39 #if defined(TARGET_PPC64) 40 /* Pointer to the vector regs */ 41 target_ulong v_regs; 42 /* 43 * On ppc64, this mcontext structure is naturally *unaligned*, 44 * or rather it is aligned on a 8 bytes boundary but not on 45 * a 16 byte boundary. This pad fixes it up. This is why we 46 * cannot use ppc_avr_t, which would force alignment. This is 47 * also why the vector regs are referenced in the ABI by the 48 * v_regs pointer above so any amount of padding can be added here. 49 */ 50 target_ulong pad; 51 /* VSCR and VRSAVE are saved separately. Also reserve space for VSX. */ 52 struct { 53 uint64_t altivec[34 + 16][2]; 54 } mc_vregs; 55 #else 56 target_ulong mc_pad[2]; 57 58 /* We need to handle Altivec and SPE at the same time, which no 59 kernel needs to do. Fortunately, the kernel defines this bit to 60 be Altivec-register-large all the time, rather than trying to 61 twiddle it based on the specific platform. */ 62 union { 63 /* SPE vector registers. One extra for SPEFSCR. */ 64 uint32_t spe[33]; 65 /* 66 * Altivec vector registers. One extra for VRSAVE. 67 * On ppc32, we are already aligned to 16 bytes. We could 68 * use ppc_avr_t, but choose to share the same type as ppc64. 69 */ 70 uint64_t altivec[33][2]; 71 } mc_vregs; 72 #endif 73 }; 74 75 /* See arch/powerpc/include/asm/sigcontext.h. */ 76 struct target_sigcontext { 77 target_ulong _unused[4]; 78 int32_t signal; 79 #if defined(TARGET_PPC64) 80 int32_t pad0; 81 #endif 82 target_ulong handler; 83 target_ulong oldmask; 84 target_ulong regs; /* struct pt_regs __user * */ 85 #if defined(TARGET_PPC64) 86 struct target_mcontext mcontext; 87 #endif 88 }; 89 90 /* Indices for target_mcontext.mc_gregs, below. 91 See arch/powerpc/include/asm/ptrace.h for details. */ 92 enum { 93 TARGET_PT_R0 = 0, 94 TARGET_PT_R1 = 1, 95 TARGET_PT_R2 = 2, 96 TARGET_PT_R3 = 3, 97 TARGET_PT_R4 = 4, 98 TARGET_PT_R5 = 5, 99 TARGET_PT_R6 = 6, 100 TARGET_PT_R7 = 7, 101 TARGET_PT_R8 = 8, 102 TARGET_PT_R9 = 9, 103 TARGET_PT_R10 = 10, 104 TARGET_PT_R11 = 11, 105 TARGET_PT_R12 = 12, 106 TARGET_PT_R13 = 13, 107 TARGET_PT_R14 = 14, 108 TARGET_PT_R15 = 15, 109 TARGET_PT_R16 = 16, 110 TARGET_PT_R17 = 17, 111 TARGET_PT_R18 = 18, 112 TARGET_PT_R19 = 19, 113 TARGET_PT_R20 = 20, 114 TARGET_PT_R21 = 21, 115 TARGET_PT_R22 = 22, 116 TARGET_PT_R23 = 23, 117 TARGET_PT_R24 = 24, 118 TARGET_PT_R25 = 25, 119 TARGET_PT_R26 = 26, 120 TARGET_PT_R27 = 27, 121 TARGET_PT_R28 = 28, 122 TARGET_PT_R29 = 29, 123 TARGET_PT_R30 = 30, 124 TARGET_PT_R31 = 31, 125 TARGET_PT_NIP = 32, 126 TARGET_PT_MSR = 33, 127 TARGET_PT_ORIG_R3 = 34, 128 TARGET_PT_CTR = 35, 129 TARGET_PT_LNK = 36, 130 TARGET_PT_XER = 37, 131 TARGET_PT_CCR = 38, 132 /* Yes, there are two registers with #39. One is 64-bit only. */ 133 TARGET_PT_MQ = 39, 134 TARGET_PT_SOFTE = 39, 135 TARGET_PT_TRAP = 40, 136 TARGET_PT_DAR = 41, 137 TARGET_PT_DSISR = 42, 138 TARGET_PT_RESULT = 43, 139 TARGET_PT_REGS_COUNT = 44 140 }; 141 142 143 struct target_ucontext { 144 target_ulong tuc_flags; 145 target_ulong tuc_link; /* ucontext_t __user * */ 146 struct target_sigaltstack tuc_stack; 147 #if !defined(TARGET_PPC64) 148 int32_t tuc_pad[7]; 149 target_ulong tuc_regs; /* struct mcontext __user * 150 points to uc_mcontext field */ 151 #endif 152 target_sigset_t tuc_sigmask; 153 #if defined(TARGET_PPC64) 154 target_sigset_t unused[15]; /* Allow for uc_sigmask growth */ 155 struct target_sigcontext tuc_sigcontext; 156 #else 157 int32_t tuc_maskext[30]; 158 int32_t tuc_pad2[3]; 159 struct target_mcontext tuc_mcontext; 160 #endif 161 }; 162 163 /* See arch/powerpc/kernel/signal_32.c. */ 164 struct target_sigframe { 165 struct target_sigcontext sctx; 166 struct target_mcontext mctx; 167 int32_t abigap[56]; 168 }; 169 170 #if defined(TARGET_PPC64) 171 172 #define TARGET_TRAMP_SIZE 6 173 174 struct target_rt_sigframe { 175 /* sys_rt_sigreturn requires the ucontext be the first field */ 176 struct target_ucontext uc; 177 target_ulong _unused[2]; 178 uint32_t trampoline[TARGET_TRAMP_SIZE]; 179 target_ulong pinfo; /* struct siginfo __user * */ 180 target_ulong puc; /* void __user * */ 181 struct target_siginfo info; 182 /* 64 bit ABI allows for 288 bytes below sp before decrementing it. */ 183 char abigap[288]; 184 } __attribute__((aligned(16))); 185 186 #else 187 188 struct target_rt_sigframe { 189 struct target_siginfo info; 190 struct target_ucontext uc; 191 int32_t abigap[56]; 192 }; 193 194 #endif 195 196 #if defined(TARGET_PPC64) 197 198 struct target_func_ptr { 199 target_ulong entry; 200 target_ulong toc; 201 }; 202 203 #endif 204 205 /* We use the mc_pad field for the signal return trampoline. */ 206 #define tramp mc_pad 207 208 /* See arch/powerpc/kernel/signal.c. */ 209 static target_ulong get_sigframe(struct target_sigaction *ka, 210 CPUPPCState *env, 211 int frame_size) 212 { 213 target_ulong oldsp; 214 215 oldsp = target_sigsp(get_sp_from_cpustate(env), ka); 216 217 return (oldsp - frame_size) & ~0xFUL; 218 } 219 220 #if ((defined(TARGET_WORDS_BIGENDIAN) && defined(HOST_WORDS_BIGENDIAN)) || \ 221 (!defined(HOST_WORDS_BIGENDIAN) && !defined(TARGET_WORDS_BIGENDIAN))) 222 #define PPC_VEC_HI 0 223 #define PPC_VEC_LO 1 224 #else 225 #define PPC_VEC_HI 1 226 #define PPC_VEC_LO 0 227 #endif 228 229 230 static void save_user_regs(CPUPPCState *env, struct target_mcontext *frame) 231 { 232 target_ulong msr = env->msr; 233 int i; 234 target_ulong ccr = 0; 235 236 /* In general, the kernel attempts to be intelligent about what it 237 needs to save for Altivec/FP/SPE registers. We don't care that 238 much, so we just go ahead and save everything. */ 239 240 /* Save general registers. */ 241 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) { 242 __put_user(env->gpr[i], &frame->mc_gregs[i]); 243 } 244 __put_user(env->nip, &frame->mc_gregs[TARGET_PT_NIP]); 245 __put_user(env->ctr, &frame->mc_gregs[TARGET_PT_CTR]); 246 __put_user(env->lr, &frame->mc_gregs[TARGET_PT_LNK]); 247 __put_user(env->xer, &frame->mc_gregs[TARGET_PT_XER]); 248 249 for (i = 0; i < ARRAY_SIZE(env->crf); i++) { 250 ccr |= env->crf[i] << (32 - ((i + 1) * 4)); 251 } 252 __put_user(ccr, &frame->mc_gregs[TARGET_PT_CCR]); 253 254 /* Save Altivec registers if necessary. */ 255 if (env->insns_flags & PPC_ALTIVEC) { 256 uint32_t *vrsave; 257 for (i = 0; i < 32; i++) { 258 ppc_avr_t *avr = cpu_avr_ptr(env, i); 259 ppc_avr_t *vreg = (ppc_avr_t *)&frame->mc_vregs.altivec[i]; 260 261 __put_user(avr->u64[PPC_VEC_HI], &vreg->u64[0]); 262 __put_user(avr->u64[PPC_VEC_LO], &vreg->u64[1]); 263 } 264 /* Set MSR_VR in the saved MSR value to indicate that 265 frame->mc_vregs contains valid data. */ 266 msr |= MSR_VR; 267 #if defined(TARGET_PPC64) 268 vrsave = (uint32_t *)&frame->mc_vregs.altivec[33]; 269 /* 64-bit needs to put a pointer to the vectors in the frame */ 270 __put_user(h2g(frame->mc_vregs.altivec), &frame->v_regs); 271 #else 272 vrsave = (uint32_t *)&frame->mc_vregs.altivec[32]; 273 #endif 274 __put_user((uint32_t)env->spr[SPR_VRSAVE], vrsave); 275 } 276 277 #if defined(TARGET_PPC64) 278 /* Save VSX second halves */ 279 if (env->insns_flags2 & PPC2_VSX) { 280 uint64_t *vsregs = (uint64_t *)&frame->mc_vregs.altivec[34]; 281 for (i = 0; i < 32; i++) { 282 uint64_t *vsrl = cpu_vsrl_ptr(env, i); 283 __put_user(*vsrl, &vsregs[i]); 284 } 285 } 286 #endif 287 288 /* Save floating point registers. */ 289 if (env->insns_flags & PPC_FLOAT) { 290 for (i = 0; i < 32; i++) { 291 uint64_t *fpr = cpu_fpr_ptr(env, i); 292 __put_user(*fpr, &frame->mc_fregs[i]); 293 } 294 __put_user((uint64_t) env->fpscr, &frame->mc_fregs[32]); 295 } 296 297 #if !defined(TARGET_PPC64) 298 /* Save SPE registers. The kernel only saves the high half. */ 299 if (env->insns_flags & PPC_SPE) { 300 for (i = 0; i < ARRAY_SIZE(env->gprh); i++) { 301 __put_user(env->gprh[i], &frame->mc_vregs.spe[i]); 302 } 303 /* Set MSR_SPE in the saved MSR value to indicate that 304 frame->mc_vregs contains valid data. */ 305 msr |= MSR_SPE; 306 __put_user(env->spe_fscr, &frame->mc_vregs.spe[32]); 307 } 308 #endif 309 310 /* Store MSR. */ 311 __put_user(msr, &frame->mc_gregs[TARGET_PT_MSR]); 312 } 313 314 static void encode_trampoline(int sigret, uint32_t *tramp) 315 { 316 /* Set up the sigreturn trampoline: li r0,sigret; sc. */ 317 if (sigret) { 318 __put_user(0x38000000 | sigret, &tramp[0]); 319 __put_user(0x44000002, &tramp[1]); 320 } 321 } 322 323 static void restore_user_regs(CPUPPCState *env, 324 struct target_mcontext *frame, int sig) 325 { 326 target_ulong save_r2 = 0; 327 target_ulong msr; 328 target_ulong ccr; 329 330 int i; 331 332 if (!sig) { 333 save_r2 = env->gpr[2]; 334 } 335 336 /* Restore general registers. */ 337 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) { 338 __get_user(env->gpr[i], &frame->mc_gregs[i]); 339 } 340 __get_user(env->nip, &frame->mc_gregs[TARGET_PT_NIP]); 341 __get_user(env->ctr, &frame->mc_gregs[TARGET_PT_CTR]); 342 __get_user(env->lr, &frame->mc_gregs[TARGET_PT_LNK]); 343 __get_user(env->xer, &frame->mc_gregs[TARGET_PT_XER]); 344 __get_user(ccr, &frame->mc_gregs[TARGET_PT_CCR]); 345 346 for (i = 0; i < ARRAY_SIZE(env->crf); i++) { 347 env->crf[i] = (ccr >> (32 - ((i + 1) * 4))) & 0xf; 348 } 349 350 if (!sig) { 351 env->gpr[2] = save_r2; 352 } 353 /* Restore MSR. */ 354 __get_user(msr, &frame->mc_gregs[TARGET_PT_MSR]); 355 356 /* If doing signal return, restore the previous little-endian mode. */ 357 if (sig) 358 env->msr = (env->msr & ~(1ull << MSR_LE)) | (msr & (1ull << MSR_LE)); 359 360 /* Restore Altivec registers if necessary. */ 361 if (env->insns_flags & PPC_ALTIVEC) { 362 ppc_avr_t *v_regs; 363 uint32_t *vrsave; 364 #if defined(TARGET_PPC64) 365 uint64_t v_addr; 366 /* 64-bit needs to recover the pointer to the vectors from the frame */ 367 __get_user(v_addr, &frame->v_regs); 368 v_regs = g2h(v_addr); 369 #else 370 v_regs = (ppc_avr_t *)frame->mc_vregs.altivec; 371 #endif 372 for (i = 0; i < 32; i++) { 373 ppc_avr_t *avr = cpu_avr_ptr(env, i); 374 ppc_avr_t *vreg = &v_regs[i]; 375 376 __get_user(avr->u64[PPC_VEC_HI], &vreg->u64[0]); 377 __get_user(avr->u64[PPC_VEC_LO], &vreg->u64[1]); 378 } 379 /* Set MSR_VEC in the saved MSR value to indicate that 380 frame->mc_vregs contains valid data. */ 381 #if defined(TARGET_PPC64) 382 vrsave = (uint32_t *)&v_regs[33]; 383 #else 384 vrsave = (uint32_t *)&v_regs[32]; 385 #endif 386 __get_user(env->spr[SPR_VRSAVE], vrsave); 387 } 388 389 #if defined(TARGET_PPC64) 390 /* Restore VSX second halves */ 391 if (env->insns_flags2 & PPC2_VSX) { 392 uint64_t *vsregs = (uint64_t *)&frame->mc_vregs.altivec[34]; 393 for (i = 0; i < 32; i++) { 394 uint64_t *vsrl = cpu_vsrl_ptr(env, i); 395 __get_user(*vsrl, &vsregs[i]); 396 } 397 } 398 #endif 399 400 /* Restore floating point registers. */ 401 if (env->insns_flags & PPC_FLOAT) { 402 uint64_t fpscr; 403 for (i = 0; i < 32; i++) { 404 uint64_t *fpr = cpu_fpr_ptr(env, i); 405 __get_user(*fpr, &frame->mc_fregs[i]); 406 } 407 __get_user(fpscr, &frame->mc_fregs[32]); 408 env->fpscr = (uint32_t) fpscr; 409 } 410 411 #if !defined(TARGET_PPC64) 412 /* Save SPE registers. The kernel only saves the high half. */ 413 if (env->insns_flags & PPC_SPE) { 414 for (i = 0; i < ARRAY_SIZE(env->gprh); i++) { 415 __get_user(env->gprh[i], &frame->mc_vregs.spe[i]); 416 } 417 __get_user(env->spe_fscr, &frame->mc_vregs.spe[32]); 418 } 419 #endif 420 } 421 422 #if !defined(TARGET_PPC64) 423 void setup_frame(int sig, struct target_sigaction *ka, 424 target_sigset_t *set, CPUPPCState *env) 425 { 426 struct target_sigframe *frame; 427 struct target_sigcontext *sc; 428 target_ulong frame_addr, newsp; 429 int err = 0; 430 431 frame_addr = get_sigframe(ka, env, sizeof(*frame)); 432 trace_user_setup_frame(env, frame_addr); 433 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1)) 434 goto sigsegv; 435 sc = &frame->sctx; 436 437 __put_user(ka->_sa_handler, &sc->handler); 438 __put_user(set->sig[0], &sc->oldmask); 439 __put_user(set->sig[1], &sc->_unused[3]); 440 __put_user(h2g(&frame->mctx), &sc->regs); 441 __put_user(sig, &sc->signal); 442 443 /* Save user regs. */ 444 save_user_regs(env, &frame->mctx); 445 446 /* Construct the trampoline code on the stack. */ 447 encode_trampoline(TARGET_NR_sigreturn, (uint32_t *)&frame->mctx.tramp); 448 449 /* The kernel checks for the presence of a VDSO here. We don't 450 emulate a vdso, so use a sigreturn system call. */ 451 env->lr = (target_ulong) h2g(frame->mctx.tramp); 452 453 /* Turn off all fp exceptions. */ 454 env->fpscr = 0; 455 456 /* Create a stack frame for the caller of the handler. */ 457 newsp = frame_addr - SIGNAL_FRAMESIZE; 458 err |= put_user(env->gpr[1], newsp, target_ulong); 459 460 if (err) 461 goto sigsegv; 462 463 /* Set up registers for signal handler. */ 464 env->gpr[1] = newsp; 465 env->gpr[3] = sig; 466 env->gpr[4] = frame_addr + offsetof(struct target_sigframe, sctx); 467 468 env->nip = (target_ulong) ka->_sa_handler; 469 470 /* Signal handlers are entered in big-endian mode. */ 471 env->msr &= ~(1ull << MSR_LE); 472 473 unlock_user_struct(frame, frame_addr, 1); 474 return; 475 476 sigsegv: 477 unlock_user_struct(frame, frame_addr, 1); 478 force_sigsegv(sig); 479 } 480 #endif /* !defined(TARGET_PPC64) */ 481 482 void setup_rt_frame(int sig, struct target_sigaction *ka, 483 target_siginfo_t *info, 484 target_sigset_t *set, CPUPPCState *env) 485 { 486 struct target_rt_sigframe *rt_sf; 487 uint32_t *trampptr = 0; 488 struct target_mcontext *mctx = 0; 489 target_ulong rt_sf_addr, newsp = 0; 490 int i, err = 0; 491 #if defined(TARGET_PPC64) 492 struct target_sigcontext *sc = 0; 493 #if !defined(TARGET_ABI32) 494 struct image_info *image = ((TaskState *)thread_cpu->opaque)->info; 495 #endif 496 #endif 497 498 rt_sf_addr = get_sigframe(ka, env, sizeof(*rt_sf)); 499 if (!lock_user_struct(VERIFY_WRITE, rt_sf, rt_sf_addr, 1)) 500 goto sigsegv; 501 502 tswap_siginfo(&rt_sf->info, info); 503 504 __put_user(0, &rt_sf->uc.tuc_flags); 505 __put_user(0, &rt_sf->uc.tuc_link); 506 target_save_altstack(&rt_sf->uc.tuc_stack, env); 507 #if !defined(TARGET_PPC64) 508 __put_user(h2g (&rt_sf->uc.tuc_mcontext), 509 &rt_sf->uc.tuc_regs); 510 #endif 511 for(i = 0; i < TARGET_NSIG_WORDS; i++) { 512 __put_user(set->sig[i], &rt_sf->uc.tuc_sigmask.sig[i]); 513 } 514 515 #if defined(TARGET_PPC64) 516 mctx = &rt_sf->uc.tuc_sigcontext.mcontext; 517 trampptr = &rt_sf->trampoline[0]; 518 519 sc = &rt_sf->uc.tuc_sigcontext; 520 __put_user(h2g(mctx), &sc->regs); 521 __put_user(sig, &sc->signal); 522 #else 523 mctx = &rt_sf->uc.tuc_mcontext; 524 trampptr = (uint32_t *)&rt_sf->uc.tuc_mcontext.tramp; 525 #endif 526 527 save_user_regs(env, mctx); 528 encode_trampoline(TARGET_NR_rt_sigreturn, trampptr); 529 530 /* The kernel checks for the presence of a VDSO here. We don't 531 emulate a vdso, so use a sigreturn system call. */ 532 env->lr = (target_ulong) h2g(trampptr); 533 534 /* Turn off all fp exceptions. */ 535 env->fpscr = 0; 536 537 /* Create a stack frame for the caller of the handler. */ 538 newsp = rt_sf_addr - (SIGNAL_FRAMESIZE + 16); 539 err |= put_user(env->gpr[1], newsp, target_ulong); 540 541 if (err) 542 goto sigsegv; 543 544 /* Set up registers for signal handler. */ 545 env->gpr[1] = newsp; 546 env->gpr[3] = (target_ulong) sig; 547 env->gpr[4] = (target_ulong) h2g(&rt_sf->info); 548 env->gpr[5] = (target_ulong) h2g(&rt_sf->uc); 549 env->gpr[6] = (target_ulong) h2g(rt_sf); 550 551 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) 552 if (get_ppc64_abi(image) < 2) { 553 /* ELFv1 PPC64 function pointers are pointers to OPD entries. */ 554 struct target_func_ptr *handler = 555 (struct target_func_ptr *)g2h(ka->_sa_handler); 556 env->nip = tswapl(handler->entry); 557 env->gpr[2] = tswapl(handler->toc); 558 } else { 559 /* ELFv2 PPC64 function pointers are entry points. R12 must also be set. */ 560 env->gpr[12] = env->nip = ka->_sa_handler; 561 } 562 #else 563 env->nip = (target_ulong) ka->_sa_handler; 564 #endif 565 566 /* Signal handlers are entered in big-endian mode. */ 567 env->msr &= ~(1ull << MSR_LE); 568 569 unlock_user_struct(rt_sf, rt_sf_addr, 1); 570 return; 571 572 sigsegv: 573 unlock_user_struct(rt_sf, rt_sf_addr, 1); 574 force_sigsegv(sig); 575 576 } 577 578 #if !defined(TARGET_PPC64) || defined(TARGET_ABI32) 579 long do_sigreturn(CPUPPCState *env) 580 { 581 struct target_sigcontext *sc = NULL; 582 struct target_mcontext *sr = NULL; 583 target_ulong sr_addr = 0, sc_addr; 584 sigset_t blocked; 585 target_sigset_t set; 586 587 sc_addr = env->gpr[1] + SIGNAL_FRAMESIZE; 588 if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1)) 589 goto sigsegv; 590 591 #if defined(TARGET_PPC64) 592 set.sig[0] = sc->oldmask + ((uint64_t)(sc->_unused[3]) << 32); 593 #else 594 __get_user(set.sig[0], &sc->oldmask); 595 __get_user(set.sig[1], &sc->_unused[3]); 596 #endif 597 target_to_host_sigset_internal(&blocked, &set); 598 set_sigmask(&blocked); 599 600 __get_user(sr_addr, &sc->regs); 601 if (!lock_user_struct(VERIFY_READ, sr, sr_addr, 1)) 602 goto sigsegv; 603 restore_user_regs(env, sr, 1); 604 605 unlock_user_struct(sr, sr_addr, 1); 606 unlock_user_struct(sc, sc_addr, 1); 607 return -TARGET_QEMU_ESIGRETURN; 608 609 sigsegv: 610 unlock_user_struct(sr, sr_addr, 1); 611 unlock_user_struct(sc, sc_addr, 1); 612 force_sig(TARGET_SIGSEGV); 613 return -TARGET_QEMU_ESIGRETURN; 614 } 615 #endif /* !defined(TARGET_PPC64) */ 616 617 /* See arch/powerpc/kernel/signal_32.c. */ 618 static int do_setcontext(struct target_ucontext *ucp, CPUPPCState *env, int sig) 619 { 620 struct target_mcontext *mcp; 621 target_ulong mcp_addr; 622 sigset_t blocked; 623 target_sigset_t set; 624 625 if (copy_from_user(&set, h2g(ucp) + offsetof(struct target_ucontext, tuc_sigmask), 626 sizeof (set))) 627 return 1; 628 629 #if defined(TARGET_PPC64) 630 mcp_addr = h2g(ucp) + 631 offsetof(struct target_ucontext, tuc_sigcontext.mcontext); 632 #else 633 __get_user(mcp_addr, &ucp->tuc_regs); 634 #endif 635 636 if (!lock_user_struct(VERIFY_READ, mcp, mcp_addr, 1)) 637 return 1; 638 639 target_to_host_sigset_internal(&blocked, &set); 640 set_sigmask(&blocked); 641 restore_user_regs(env, mcp, sig); 642 643 unlock_user_struct(mcp, mcp_addr, 1); 644 return 0; 645 } 646 647 long do_rt_sigreturn(CPUPPCState *env) 648 { 649 struct target_rt_sigframe *rt_sf = NULL; 650 target_ulong rt_sf_addr; 651 652 rt_sf_addr = env->gpr[1] + SIGNAL_FRAMESIZE + 16; 653 if (!lock_user_struct(VERIFY_READ, rt_sf, rt_sf_addr, 1)) 654 goto sigsegv; 655 656 if (do_setcontext(&rt_sf->uc, env, 1)) 657 goto sigsegv; 658 659 do_sigaltstack(rt_sf_addr 660 + offsetof(struct target_rt_sigframe, uc.tuc_stack), 661 0, env->gpr[1]); 662 663 unlock_user_struct(rt_sf, rt_sf_addr, 1); 664 return -TARGET_QEMU_ESIGRETURN; 665 666 sigsegv: 667 unlock_user_struct(rt_sf, rt_sf_addr, 1); 668 force_sig(TARGET_SIGSEGV); 669 return -TARGET_QEMU_ESIGRETURN; 670 } 671 672 /* This syscall implements {get,set,swap}context for userland. */ 673 abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, 674 abi_ulong unew_ctx, abi_long ctx_size) 675 { 676 struct target_ucontext *uctx; 677 struct target_mcontext *mctx; 678 679 /* For ppc32, ctx_size is "reserved for future use". 680 * For ppc64, we do not yet support the VSX extension. 681 */ 682 if (ctx_size < sizeof(struct target_ucontext)) { 683 return -TARGET_EINVAL; 684 } 685 686 if (uold_ctx) { 687 TaskState *ts = (TaskState *)thread_cpu->opaque; 688 689 if (!lock_user_struct(VERIFY_WRITE, uctx, uold_ctx, 1)) { 690 return -TARGET_EFAULT; 691 } 692 693 #ifdef TARGET_PPC64 694 mctx = &uctx->tuc_sigcontext.mcontext; 695 #else 696 /* ??? The kernel aligns the pointer down here into padding, but 697 * in setup_rt_frame we don't. Be self-compatible for now. 698 */ 699 mctx = &uctx->tuc_mcontext; 700 __put_user(h2g(mctx), &uctx->tuc_regs); 701 #endif 702 703 save_user_regs(env, mctx); 704 host_to_target_sigset(&uctx->tuc_sigmask, &ts->signal_mask); 705 706 unlock_user_struct(uctx, uold_ctx, 1); 707 } 708 709 if (unew_ctx) { 710 int err; 711 712 if (!lock_user_struct(VERIFY_READ, uctx, unew_ctx, 1)) { 713 return -TARGET_EFAULT; 714 } 715 err = do_setcontext(uctx, env, 0); 716 unlock_user_struct(uctx, unew_ctx, 1); 717 718 if (err) { 719 /* We cannot return to a partially updated context. */ 720 force_sig(TARGET_SIGSEGV); 721 } 722 return -TARGET_QEMU_ESIGRETURN; 723 } 724 725 return 0; 726 } 727