signal.c (21351B)
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. */ 35struct 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. */ 77struct 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. */ 93enum { 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 144struct 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. */ 165struct 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 175struct 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 189struct 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 199struct target_func_ptr { 200 target_ulong entry; 201 target_ulong toc; 202}; 203 204#endif 205 206/* See arch/powerpc/kernel/signal.c. */ 207static 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 ((defined(TARGET_WORDS_BIGENDIAN) && defined(HOST_WORDS_BIGENDIAN)) || \ 219 (!defined(HOST_WORDS_BIGENDIAN) && !defined(TARGET_WORDS_BIGENDIAN))) 220#define PPC_VEC_HI 0 221#define PPC_VEC_LO 1 222#else 223#define PPC_VEC_HI 1 224#define PPC_VEC_LO 0 225#endif 226 227 228static void save_user_regs(CPUPPCState *env, struct target_mcontext *frame) 229{ 230 target_ulong msr = env->msr; 231 int i; 232 target_ulong ccr = 0; 233 234 /* In general, the kernel attempts to be intelligent about what it 235 needs to save for Altivec/FP/SPE registers. We don't care that 236 much, so we just go ahead and save everything. */ 237 238 /* Save general registers. */ 239 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) { 240 __put_user(env->gpr[i], &frame->mc_gregs[i]); 241 } 242 __put_user(env->nip, &frame->mc_gregs[TARGET_PT_NIP]); 243 __put_user(env->ctr, &frame->mc_gregs[TARGET_PT_CTR]); 244 __put_user(env->lr, &frame->mc_gregs[TARGET_PT_LNK]); 245 __put_user(env->xer, &frame->mc_gregs[TARGET_PT_XER]); 246 247 for (i = 0; i < ARRAY_SIZE(env->crf); i++) { 248 ccr |= env->crf[i] << (32 - ((i + 1) * 4)); 249 } 250 __put_user(ccr, &frame->mc_gregs[TARGET_PT_CCR]); 251 252 /* Save Altivec registers if necessary. */ 253 if (env->insns_flags & PPC_ALTIVEC) { 254 uint32_t *vrsave; 255 for (i = 0; i < 32; i++) { 256 ppc_avr_t *avr = cpu_avr_ptr(env, i); 257 ppc_avr_t *vreg = (ppc_avr_t *)&frame->mc_vregs.altivec[i]; 258 259 __put_user(avr->u64[PPC_VEC_HI], &vreg->u64[0]); 260 __put_user(avr->u64[PPC_VEC_LO], &vreg->u64[1]); 261 } 262#if defined(TARGET_PPC64) 263 vrsave = (uint32_t *)&frame->mc_vregs.altivec[33]; 264 /* 64-bit needs to put a pointer to the vectors in the frame */ 265 __put_user(h2g(frame->mc_vregs.altivec), &frame->v_regs); 266#else 267 vrsave = (uint32_t *)&frame->mc_vregs.altivec[32]; 268#endif 269 __put_user((uint32_t)env->spr[SPR_VRSAVE], vrsave); 270 } 271 272#if defined(TARGET_PPC64) 273 /* Save VSX second halves */ 274 if (env->insns_flags2 & PPC2_VSX) { 275 uint64_t *vsregs = (uint64_t *)&frame->mc_vregs.altivec[34]; 276 for (i = 0; i < 32; i++) { 277 uint64_t *vsrl = cpu_vsrl_ptr(env, i); 278 __put_user(*vsrl, &vsregs[i]); 279 } 280 } 281#endif 282 283 /* Save floating point registers. */ 284 if (env->insns_flags & PPC_FLOAT) { 285 for (i = 0; i < 32; i++) { 286 uint64_t *fpr = cpu_fpr_ptr(env, i); 287 __put_user(*fpr, &frame->mc_fregs[i]); 288 } 289 __put_user((uint64_t) env->fpscr, &frame->mc_fregs[32]); 290 } 291 292#if !defined(TARGET_PPC64) 293 /* Save SPE registers. The kernel only saves the high half. */ 294 if (env->insns_flags & PPC_SPE) { 295 for (i = 0; i < ARRAY_SIZE(env->gprh); i++) { 296 __put_user(env->gprh[i], &frame->mc_vregs.spe[i]); 297 } 298 __put_user(env->spe_fscr, &frame->mc_vregs.spe[32]); 299 } 300#endif 301 302 /* Store MSR. */ 303 __put_user(msr, &frame->mc_gregs[TARGET_PT_MSR]); 304} 305 306static void encode_trampoline(int sigret, uint32_t *tramp) 307{ 308 /* Set up the sigreturn trampoline: li r0,sigret; sc. */ 309 __put_user(0x38000000 | sigret, &tramp[0]); 310 __put_user(0x44000002, &tramp[1]); 311} 312 313static void restore_user_regs(CPUPPCState *env, 314 struct target_mcontext *frame, int sig) 315{ 316 target_ulong save_r2 = 0; 317 target_ulong msr; 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 __get_user(env->xer, &frame->mc_gregs[TARGET_PT_XER]); 334 __get_user(ccr, &frame->mc_gregs[TARGET_PT_CCR]); 335 336 for (i = 0; i < ARRAY_SIZE(env->crf); i++) { 337 env->crf[i] = (ccr >> (32 - ((i + 1) * 4))) & 0xf; 338 } 339 340 if (!sig) { 341 env->gpr[2] = save_r2; 342 } 343 /* Restore MSR. */ 344 __get_user(msr, &frame->mc_gregs[TARGET_PT_MSR]); 345 346 /* If doing signal return, restore the previous little-endian mode. */ 347 if (sig) { 348 ppc_store_msr(env, ((env->msr & ~(1ull << MSR_LE)) | 349 (msr & (1ull << MSR_LE)))); 350 } 351 352 /* Restore Altivec registers if necessary. */ 353 if (env->insns_flags & PPC_ALTIVEC) { 354 ppc_avr_t *v_regs; 355 uint32_t *vrsave; 356#if defined(TARGET_PPC64) 357 uint64_t v_addr; 358 /* 64-bit needs to recover the pointer to the vectors from the frame */ 359 __get_user(v_addr, &frame->v_regs); 360 v_regs = g2h(env_cpu(env), v_addr); 361#else 362 v_regs = (ppc_avr_t *)frame->mc_vregs.altivec; 363#endif 364 for (i = 0; i < 32; i++) { 365 ppc_avr_t *avr = cpu_avr_ptr(env, i); 366 ppc_avr_t *vreg = &v_regs[i]; 367 368 __get_user(avr->u64[PPC_VEC_HI], &vreg->u64[0]); 369 __get_user(avr->u64[PPC_VEC_LO], &vreg->u64[1]); 370 } 371#if defined(TARGET_PPC64) 372 vrsave = (uint32_t *)&v_regs[33]; 373#else 374 vrsave = (uint32_t *)&v_regs[32]; 375#endif 376 __get_user(env->spr[SPR_VRSAVE], vrsave); 377 } 378 379#if defined(TARGET_PPC64) 380 /* Restore VSX second halves */ 381 if (env->insns_flags2 & PPC2_VSX) { 382 uint64_t *vsregs = (uint64_t *)&frame->mc_vregs.altivec[34]; 383 for (i = 0; i < 32; i++) { 384 uint64_t *vsrl = cpu_vsrl_ptr(env, i); 385 __get_user(*vsrl, &vsregs[i]); 386 } 387 } 388#endif 389 390 /* Restore floating point registers. */ 391 if (env->insns_flags & PPC_FLOAT) { 392 uint64_t fpscr; 393 for (i = 0; i < 32; i++) { 394 uint64_t *fpr = cpu_fpr_ptr(env, i); 395 __get_user(*fpr, &frame->mc_fregs[i]); 396 } 397 __get_user(fpscr, &frame->mc_fregs[32]); 398 env->fpscr = (uint32_t) fpscr; 399 } 400 401#if !defined(TARGET_PPC64) 402 /* Save SPE registers. The kernel only saves the high half. */ 403 if (env->insns_flags & PPC_SPE) { 404 for (i = 0; i < ARRAY_SIZE(env->gprh); i++) { 405 __get_user(env->gprh[i], &frame->mc_vregs.spe[i]); 406 } 407 __get_user(env->spe_fscr, &frame->mc_vregs.spe[32]); 408 } 409#endif 410} 411 412#if !defined(TARGET_PPC64) 413void setup_frame(int sig, struct target_sigaction *ka, 414 target_sigset_t *set, CPUPPCState *env) 415{ 416 struct target_sigframe *frame; 417 struct target_sigcontext *sc; 418 target_ulong frame_addr, newsp; 419 int err = 0; 420 421 frame_addr = get_sigframe(ka, env, sizeof(*frame)); 422 trace_user_setup_frame(env, frame_addr); 423 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1)) 424 goto sigsegv; 425 sc = &frame->sctx; 426 427 __put_user(ka->_sa_handler, &sc->handler); 428 __put_user(set->sig[0], &sc->oldmask); 429 __put_user(set->sig[1], &sc->_unused[3]); 430 __put_user(h2g(&frame->mctx), &sc->regs); 431 __put_user(sig, &sc->signal); 432 433 /* Save user regs. */ 434 save_user_regs(env, &frame->mctx); 435 436 env->lr = default_sigreturn; 437 438 /* Turn off all fp exceptions. */ 439 env->fpscr = 0; 440 441 /* Create a stack frame for the caller of the handler. */ 442 newsp = frame_addr - SIGNAL_FRAMESIZE; 443 err |= put_user(env->gpr[1], newsp, target_ulong); 444 445 if (err) 446 goto sigsegv; 447 448 /* Set up registers for signal handler. */ 449 env->gpr[1] = newsp; 450 env->gpr[3] = sig; 451 env->gpr[4] = frame_addr + offsetof(struct target_sigframe, sctx); 452 453 env->nip = (target_ulong) ka->_sa_handler; 454 455 /* Signal handlers are entered in big-endian mode. */ 456 ppc_store_msr(env, env->msr & ~(1ull << MSR_LE)); 457 458 unlock_user_struct(frame, frame_addr, 1); 459 return; 460 461sigsegv: 462 unlock_user_struct(frame, frame_addr, 1); 463 force_sigsegv(sig); 464} 465#endif /* !defined(TARGET_PPC64) */ 466 467void setup_rt_frame(int sig, struct target_sigaction *ka, 468 target_siginfo_t *info, 469 target_sigset_t *set, CPUPPCState *env) 470{ 471 struct target_rt_sigframe *rt_sf; 472 struct target_mcontext *mctx = 0; 473 target_ulong rt_sf_addr, newsp = 0; 474 int i, err = 0; 475#if defined(TARGET_PPC64) 476 struct target_sigcontext *sc = 0; 477#if !defined(TARGET_ABI32) 478 struct image_info *image = ((TaskState *)thread_cpu->opaque)->info; 479#endif 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) && !defined(TARGET_ABI32) 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#ifdef TARGET_WORDS_BIGENDIAN 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 556sigsegv: 557 unlock_user_struct(rt_sf, rt_sf_addr, 1); 558 force_sigsegv(sig); 559 560} 561 562#if !defined(TARGET_PPC64) || defined(TARGET_ABI32) 563long 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#if defined(TARGET_PPC64) 576 set.sig[0] = sc->oldmask + ((uint64_t)(sc->_unused[3]) << 32); 577#else 578 __get_user(set.sig[0], &sc->oldmask); 579 __get_user(set.sig[1], &sc->_unused[3]); 580#endif 581 target_to_host_sigset_internal(&blocked, &set); 582 set_sigmask(&blocked); 583 584 __get_user(sr_addr, &sc->regs); 585 if (!lock_user_struct(VERIFY_READ, sr, sr_addr, 1)) 586 goto sigsegv; 587 restore_user_regs(env, sr, 1); 588 589 unlock_user_struct(sr, sr_addr, 1); 590 unlock_user_struct(sc, sc_addr, 1); 591 return -TARGET_QEMU_ESIGRETURN; 592 593sigsegv: 594 unlock_user_struct(sr, sr_addr, 1); 595 unlock_user_struct(sc, sc_addr, 1); 596 force_sig(TARGET_SIGSEGV); 597 return -TARGET_QEMU_ESIGRETURN; 598} 599#endif /* !defined(TARGET_PPC64) */ 600 601/* See arch/powerpc/kernel/signal_32.c. */ 602static int do_setcontext(struct target_ucontext *ucp, CPUPPCState *env, int sig) 603{ 604 struct target_mcontext *mcp; 605 target_ulong mcp_addr; 606 sigset_t blocked; 607 target_sigset_t set; 608 609 if (copy_from_user(&set, h2g(ucp) + offsetof(struct target_ucontext, tuc_sigmask), 610 sizeof (set))) 611 return 1; 612 613#if defined(TARGET_PPC64) 614 mcp_addr = h2g(ucp) + 615 offsetof(struct target_ucontext, tuc_sigcontext.mcontext); 616#else 617 __get_user(mcp_addr, &ucp->tuc_regs); 618#endif 619 620 if (!lock_user_struct(VERIFY_READ, mcp, mcp_addr, 1)) 621 return 1; 622 623 target_to_host_sigset_internal(&blocked, &set); 624 set_sigmask(&blocked); 625 restore_user_regs(env, mcp, sig); 626 627 unlock_user_struct(mcp, mcp_addr, 1); 628 return 0; 629} 630 631long do_rt_sigreturn(CPUPPCState *env) 632{ 633 struct target_rt_sigframe *rt_sf = NULL; 634 target_ulong rt_sf_addr; 635 636 rt_sf_addr = env->gpr[1] + SIGNAL_FRAMESIZE + 16; 637 if (!lock_user_struct(VERIFY_READ, rt_sf, rt_sf_addr, 1)) 638 goto sigsegv; 639 640 if (do_setcontext(&rt_sf->uc, env, 1)) 641 goto sigsegv; 642 643 target_restore_altstack(&rt_sf->uc.tuc_stack, env); 644 645 unlock_user_struct(rt_sf, rt_sf_addr, 1); 646 return -TARGET_QEMU_ESIGRETURN; 647 648sigsegv: 649 unlock_user_struct(rt_sf, rt_sf_addr, 1); 650 force_sig(TARGET_SIGSEGV); 651 return -TARGET_QEMU_ESIGRETURN; 652} 653 654/* This syscall implements {get,set,swap}context for userland. */ 655abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, 656 abi_ulong unew_ctx, abi_long ctx_size) 657{ 658 struct target_ucontext *uctx; 659 struct target_mcontext *mctx; 660 661 /* For ppc32, ctx_size is "reserved for future use". 662 * For ppc64, we do not yet support the VSX extension. 663 */ 664 if (ctx_size < sizeof(struct target_ucontext)) { 665 return -TARGET_EINVAL; 666 } 667 668 if (uold_ctx) { 669 TaskState *ts = (TaskState *)thread_cpu->opaque; 670 671 if (!lock_user_struct(VERIFY_WRITE, uctx, uold_ctx, 1)) { 672 return -TARGET_EFAULT; 673 } 674 675#ifdef TARGET_PPC64 676 mctx = &uctx->tuc_sigcontext.mcontext; 677#else 678 /* ??? The kernel aligns the pointer down here into padding, but 679 * in setup_rt_frame we don't. Be self-compatible for now. 680 */ 681 mctx = &uctx->tuc_mcontext; 682 __put_user(h2g(mctx), &uctx->tuc_regs); 683#endif 684 685 save_user_regs(env, mctx); 686 host_to_target_sigset(&uctx->tuc_sigmask, &ts->signal_mask); 687 688 unlock_user_struct(uctx, uold_ctx, 1); 689 } 690 691 if (unew_ctx) { 692 int err; 693 694 if (!lock_user_struct(VERIFY_READ, uctx, unew_ctx, 1)) { 695 return -TARGET_EFAULT; 696 } 697 err = do_setcontext(uctx, env, 0); 698 unlock_user_struct(uctx, unew_ctx, 1); 699 700 if (err) { 701 /* We cannot return to a partially updated context. */ 702 force_sig(TARGET_SIGSEGV); 703 } 704 return -TARGET_QEMU_ESIGRETURN; 705 } 706 707 return 0; 708} 709 710void setup_sigtramp(abi_ulong sigtramp_page) 711{ 712 uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 2 * 8, 0); 713 assert(tramp != NULL); 714 715#ifdef TARGET_ARCH_HAS_SETUP_FRAME 716 default_sigreturn = sigtramp_page; 717 encode_trampoline(TARGET_NR_sigreturn, tramp + 0); 718#endif 719 720 default_rt_sigreturn = sigtramp_page + 8; 721 encode_trampoline(TARGET_NR_rt_sigreturn, tramp + 2); 722 723 unlock_user(tramp, sigtramp_page, 2 * 8); 724}