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