Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/bsd/dev/i386/unix_signal.c
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1 /* 2 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* 29 * Copyright (c) 1992 NeXT, Inc. 30 * 31 * HISTORY 32 * 13 May 1992 ? at NeXT 33 * Created. 34 */ 35 36 #include <mach/mach_types.h> 37 #include <mach/exception.h> 38 39 #include <kern/thread.h> 40 41 #include <sys/systm.h> 42 #include <sys/param.h> 43 #include <sys/proc_internal.h> 44 #include <sys/user.h> 45 #include <sys/sysproto.h> 46 #include <sys/sysent.h> 47 #include <sys/ucontext.h> 48 #include <sys/wait.h> 49 #include <mach/thread_act.h> /* for thread_abort_safely */ 50 #include <mach/thread_status.h> 51 52 #include <i386/eflags.h> 53 #include <i386/psl.h> 54 #include <i386/machine_routines.h> 55 #include <i386/seg.h> 56 57 #include <machine/pal_routines.h> 58 59 #include <sys/kdebug.h> 60 #include <sys/sdt.h> 61 62 63 /* Forward: */ 64 extern boolean_t machine_exception(int, mach_exception_code_t, 65 mach_exception_subcode_t, int *, mach_exception_subcode_t *); 66 extern kern_return_t thread_getstatus(register thread_t act, int flavor, 67 thread_state_t tstate, mach_msg_type_number_t *count); 68 extern kern_return_t thread_setstatus(thread_t thread, int flavor, 69 thread_state_t tstate, mach_msg_type_number_t count); 70 71 /* Signal handler flavors supported */ 72 /* These defns should match the Libc implmn */ 73 #define UC_TRAD 1 74 #define UC_FLAVOR 30 75 #define UC_SET_ALT_STACK 0x40000000 76 #define UC_RESET_ALT_STACK 0x80000000 77 78 #define C_32_STK_ALIGN 16 79 #define C_64_STK_ALIGN 16 80 #define C_64_REDZONE_LEN 128 81 #define TRUNC_DOWN32(a,c) ((((uint32_t)a)-(c)) & ((uint32_t)(-(c)))) 82 #define TRUNC_DOWN64(a,c) ((((uint64_t)a)-(c)) & ((uint64_t)(-(c)))) 83 84 /* 85 * Send an interrupt to process. 86 * 87 * Stack is set up to allow sigcode stored 88 * in u. to call routine, followed by chmk 89 * to sigreturn routine below. After sigreturn 90 * resets the signal mask, the stack, the frame 91 * pointer, and the argument pointer, it returns 92 * to the user specified pc, psl. 93 */ 94 struct sigframe32 { 95 int retaddr; 96 user32_addr_t catcher; /* sig_t */ 97 int sigstyle; 98 int sig; 99 user32_addr_t sinfo; /* siginfo32_t* */ 100 user32_addr_t uctx; /* struct ucontext32 */ 101 }; 102 103 /* 104 * NOTE: Source and target may *NOT* overlap! 105 * XXX: Unify with bsd/kern/kern_exit.c 106 */ 107 static void 108 siginfo_user_to_user32_x86(user_siginfo_t *in, user32_siginfo_t *out) 109 { 110 out->si_signo = in->si_signo; 111 out->si_errno = in->si_errno; 112 out->si_code = in->si_code; 113 out->si_pid = in->si_pid; 114 out->si_uid = in->si_uid; 115 out->si_status = in->si_status; 116 out->si_addr = CAST_DOWN_EXPLICIT(user32_addr_t,in->si_addr); 117 /* following cast works for sival_int because of padding */ 118 out->si_value.sival_ptr = CAST_DOWN_EXPLICIT(user32_addr_t,in->si_value.sival_ptr); 119 out->si_band = in->si_band; /* range reduction */ 120 out->__pad[0] = in->pad[0]; /* mcontext.ss.r1 */ 121 } 122 123 static void 124 siginfo_user_to_user64_x86(user_siginfo_t *in, user64_siginfo_t *out) 125 { 126 out->si_signo = in->si_signo; 127 out->si_errno = in->si_errno; 128 out->si_code = in->si_code; 129 out->si_pid = in->si_pid; 130 out->si_uid = in->si_uid; 131 out->si_status = in->si_status; 132 out->si_addr = in->si_addr; 133 out->si_value.sival_ptr = in->si_value.sival_ptr; 134 out->si_band = in->si_band; /* range reduction */ 135 out->__pad[0] = in->pad[0]; /* mcontext.ss.r1 */ 136 } 137 138 void 139 sendsig(struct proc *p, user_addr_t ua_catcher, int sig, int mask, __unused uint32_t code) 140 { 141 union { 142 struct mcontext_avx32 mctx_avx32; 143 struct mcontext_avx64 mctx_avx64; 144 } mctx_store, *mctxp = &mctx_store; 145 146 user_addr_t ua_sp; 147 user_addr_t ua_fp; 148 user_addr_t ua_cr2; 149 user_addr_t ua_sip; 150 user_addr_t ua_uctxp; 151 user_addr_t ua_mctxp; 152 user_siginfo_t sinfo64; 153 154 struct sigacts *ps = p->p_sigacts; 155 int oonstack, flavor; 156 user_addr_t trampact; 157 int sigonstack; 158 void * state; 159 mach_msg_type_number_t state_count; 160 161 thread_t thread; 162 struct uthread * ut; 163 int stack_size = 0; 164 int infostyle = UC_TRAD; 165 boolean_t sig_avx; 166 167 thread = current_thread(); 168 ut = get_bsdthread_info(thread); 169 170 if (p->p_sigacts->ps_siginfo & sigmask(sig)) 171 infostyle = UC_FLAVOR; 172 173 oonstack = ut->uu_sigstk.ss_flags & SA_ONSTACK; 174 trampact = ps->ps_trampact[sig]; 175 sigonstack = (ps->ps_sigonstack & sigmask(sig)); 176 177 /* 178 * init siginfo 179 */ 180 proc_unlock(p); 181 182 bzero((caddr_t)&sinfo64, sizeof(sinfo64)); 183 sinfo64.si_signo = sig; 184 185 bzero(mctxp, sizeof(*mctxp)); 186 sig_avx = ml_fpu_avx_enabled(); 187 188 if (proc_is64bit(p)) { 189 x86_thread_state64_t *tstate64; 190 struct user_ucontext64 uctx64; 191 192 flavor = x86_THREAD_STATE64; 193 state_count = x86_THREAD_STATE64_COUNT; 194 state = (void *)&mctxp->mctx_avx64.ss; 195 if (thread_getstatus(thread, flavor, (thread_state_t)state, &state_count) != KERN_SUCCESS) 196 goto bad; 197 198 if (sig_avx) { 199 flavor = x86_AVX_STATE64; 200 state_count = x86_AVX_STATE64_COUNT; 201 } 202 else { 203 flavor = x86_FLOAT_STATE64; 204 state_count = x86_FLOAT_STATE64_COUNT; 205 } 206 state = (void *)&mctxp->mctx_avx64.fs; 207 if (thread_getstatus(thread, flavor, (thread_state_t)state, &state_count) != KERN_SUCCESS) 208 goto bad; 209 210 flavor = x86_EXCEPTION_STATE64; 211 state_count = x86_EXCEPTION_STATE64_COUNT; 212 state = (void *)&mctxp->mctx_avx64.es; 213 if (thread_getstatus(thread, flavor, (thread_state_t)state, &state_count) != KERN_SUCCESS) 214 goto bad; 215 216 tstate64 = &mctxp->mctx_avx64.ss; 217 218 /* figure out where our new stack lives */ 219 if ((ut->uu_flag & UT_ALTSTACK) && !oonstack && 220 (sigonstack)) { 221 ua_sp = ut->uu_sigstk.ss_sp; 222 stack_size = ut->uu_sigstk.ss_size; 223 ua_sp += stack_size; 224 ut->uu_sigstk.ss_flags |= SA_ONSTACK; 225 } else { 226 ua_sp = tstate64->rsp; 227 } 228 ua_cr2 = mctxp->mctx_avx64.es.faultvaddr; 229 230 /* The x86_64 ABI defines a 128-byte red zone. */ 231 ua_sp -= C_64_REDZONE_LEN; 232 233 ua_sp -= sizeof (struct user_ucontext64); 234 ua_uctxp = ua_sp; // someone tramples the first word! 235 236 ua_sp -= sizeof (user64_siginfo_t); 237 ua_sip = ua_sp; 238 239 ua_sp -= sizeof (struct mcontext_avx64); 240 ua_mctxp = ua_sp; 241 242 /* 243 * Align the frame and stack pointers to 16 bytes for SSE. 244 * (Note that we use 'ua_fp' as the base of the stack going forward) 245 */ 246 ua_fp = TRUNC_DOWN64(ua_sp, C_64_STK_ALIGN); 247 248 /* 249 * But we need to account for the return address so the alignment is 250 * truly "correct" at _sigtramp 251 */ 252 ua_fp -= sizeof(user_addr_t); 253 254 /* 255 * Build the signal context to be used by sigreturn. 256 */ 257 bzero(&uctx64, sizeof(uctx64)); 258 259 uctx64.uc_onstack = oonstack; 260 uctx64.uc_sigmask = mask; 261 uctx64.uc_stack.ss_sp = ua_fp; 262 uctx64.uc_stack.ss_size = stack_size; 263 264 if (oonstack) 265 uctx64.uc_stack.ss_flags |= SS_ONSTACK; 266 uctx64.uc_link = 0; 267 268 uctx64.uc_mcsize = sig_avx ? sizeof(struct mcontext_avx64) : sizeof(struct mcontext64); 269 uctx64.uc_mcontext64 = ua_mctxp; 270 271 if (copyout((caddr_t)&uctx64, ua_uctxp, sizeof (uctx64))) 272 goto bad; 273 274 if (copyout((caddr_t)&mctxp->mctx_avx64, ua_mctxp, sizeof (struct mcontext_avx64))) 275 goto bad; 276 277 sinfo64.pad[0] = tstate64->rsp; 278 sinfo64.si_addr = tstate64->rip; 279 280 tstate64->rip = trampact; 281 tstate64->rsp = ua_fp; 282 tstate64->rflags = get_eflags_exportmask(); 283 /* 284 * JOE - might not need to set these 285 */ 286 tstate64->cs = USER64_CS; 287 tstate64->fs = NULL_SEG; 288 tstate64->gs = USER_CTHREAD; 289 290 /* 291 * Build the argument list for the signal handler. 292 * Handler should call sigreturn to get out of it 293 */ 294 tstate64->rdi = ua_catcher; 295 tstate64->rsi = infostyle; 296 tstate64->rdx = sig; 297 tstate64->rcx = ua_sip; 298 tstate64->r8 = ua_uctxp; 299 300 } else { 301 x86_thread_state32_t *tstate32; 302 struct user_ucontext32 uctx32; 303 struct sigframe32 frame32; 304 305 flavor = x86_THREAD_STATE32; 306 state_count = x86_THREAD_STATE32_COUNT; 307 state = (void *)&mctxp->mctx_avx32.ss; 308 if (thread_getstatus(thread, flavor, (thread_state_t)state, &state_count) != KERN_SUCCESS) 309 goto bad; 310 311 if (sig_avx) { 312 flavor = x86_AVX_STATE32; 313 state_count = x86_AVX_STATE32_COUNT; 314 } 315 else { 316 flavor = x86_FLOAT_STATE32; 317 state_count = x86_FLOAT_STATE32_COUNT; 318 } 319 320 state = (void *)&mctxp->mctx_avx32.fs; 321 if (thread_getstatus(thread, flavor, (thread_state_t)state, &state_count) != KERN_SUCCESS) 322 goto bad; 323 324 flavor = x86_EXCEPTION_STATE32; 325 state_count = x86_EXCEPTION_STATE32_COUNT; 326 state = (void *)&mctxp->mctx_avx32.es; 327 if (thread_getstatus(thread, flavor, (thread_state_t)state, &state_count) != KERN_SUCCESS) 328 goto bad; 329 330 tstate32 = &mctxp->mctx_avx32.ss; 331 332 /* figure out where our new stack lives */ 333 if ((ut->uu_flag & UT_ALTSTACK) && !oonstack && 334 (sigonstack)) { 335 ua_sp = ut->uu_sigstk.ss_sp; 336 stack_size = ut->uu_sigstk.ss_size; 337 ua_sp += stack_size; 338 ut->uu_sigstk.ss_flags |= SA_ONSTACK; 339 } else { 340 ua_sp = tstate32->esp; 341 } 342 ua_cr2 = mctxp->mctx_avx32.es.faultvaddr; 343 344 ua_sp -= sizeof (struct user_ucontext32); 345 ua_uctxp = ua_sp; // someone tramples the first word! 346 347 ua_sp -= sizeof (user32_siginfo_t); 348 ua_sip = ua_sp; 349 350 ua_sp -= sizeof (struct mcontext_avx32); 351 ua_mctxp = ua_sp; 352 353 ua_sp -= sizeof (struct sigframe32); 354 ua_fp = ua_sp; 355 356 /* 357 * Align the frame and stack pointers to 16 bytes for SSE. 358 * (Note that we use 'fp' as the base of the stack going forward) 359 */ 360 ua_fp = TRUNC_DOWN32(ua_fp, C_32_STK_ALIGN); 361 362 /* 363 * But we need to account for the return address so the alignment is 364 * truly "correct" at _sigtramp 365 */ 366 ua_fp -= sizeof(frame32.retaddr); 367 368 /* 369 * Build the argument list for the signal handler. 370 * Handler should call sigreturn to get out of it 371 */ 372 frame32.retaddr = -1; 373 frame32.sigstyle = infostyle; 374 frame32.sig = sig; 375 frame32.catcher = CAST_DOWN_EXPLICIT(user32_addr_t, ua_catcher); 376 frame32.sinfo = CAST_DOWN_EXPLICIT(user32_addr_t, ua_sip); 377 frame32.uctx = CAST_DOWN_EXPLICIT(user32_addr_t, ua_uctxp); 378 379 if (copyout((caddr_t)&frame32, ua_fp, sizeof (frame32))) 380 goto bad; 381 382 /* 383 * Build the signal context to be used by sigreturn. 384 */ 385 bzero(&uctx32, sizeof(uctx32)); 386 387 uctx32.uc_onstack = oonstack; 388 uctx32.uc_sigmask = mask; 389 uctx32.uc_stack.ss_sp = CAST_DOWN_EXPLICIT(user32_addr_t, ua_fp); 390 uctx32.uc_stack.ss_size = stack_size; 391 392 if (oonstack) 393 uctx32.uc_stack.ss_flags |= SS_ONSTACK; 394 uctx32.uc_link = 0; 395 396 uctx32.uc_mcsize = sig_avx ? sizeof(struct mcontext_avx32) : sizeof(struct mcontext32); 397 398 uctx32.uc_mcontext = CAST_DOWN_EXPLICIT(user32_addr_t, ua_mctxp); 399 400 if (copyout((caddr_t)&uctx32, ua_uctxp, sizeof (uctx32))) 401 goto bad; 402 403 if (copyout((caddr_t)&mctxp->mctx_avx32, ua_mctxp, sizeof (struct mcontext_avx32))) 404 goto bad; 405 406 sinfo64.pad[0] = tstate32->esp; 407 sinfo64.si_addr = tstate32->eip; 408 } 409 410 switch (sig) { 411 case SIGILL: 412 switch (ut->uu_code) { 413 case EXC_I386_INVOP: 414 sinfo64.si_code = ILL_ILLOPC; 415 break; 416 default: 417 sinfo64.si_code = ILL_NOOP; 418 } 419 break; 420 case SIGFPE: 421 #define FP_IE 0 /* Invalid operation */ 422 #define FP_DE 1 /* Denormalized operand */ 423 #define FP_ZE 2 /* Zero divide */ 424 #define FP_OE 3 /* overflow */ 425 #define FP_UE 4 /* underflow */ 426 #define FP_PE 5 /* precision */ 427 if (ut->uu_code == EXC_I386_DIV) { 428 sinfo64.si_code = FPE_INTDIV; 429 } 430 else if (ut->uu_code == EXC_I386_INTO) { 431 sinfo64.si_code = FPE_INTOVF; 432 } 433 else if (ut->uu_subcode & (1 << FP_ZE)) { 434 sinfo64.si_code = FPE_FLTDIV; 435 } else if (ut->uu_subcode & (1 << FP_OE)) { 436 sinfo64.si_code = FPE_FLTOVF; 437 } else if (ut->uu_subcode & (1 << FP_UE)) { 438 sinfo64.si_code = FPE_FLTUND; 439 } else if (ut->uu_subcode & (1 << FP_PE)) { 440 sinfo64.si_code = FPE_FLTRES; 441 } else if (ut->uu_subcode & (1 << FP_IE)) { 442 sinfo64.si_code = FPE_FLTINV; 443 } else { 444 sinfo64.si_code = FPE_NOOP; 445 } 446 break; 447 case SIGBUS: 448 sinfo64.si_code = BUS_ADRERR; 449 sinfo64.si_addr = ua_cr2; 450 break; 451 case SIGTRAP: 452 sinfo64.si_code = TRAP_BRKPT; 453 break; 454 case SIGSEGV: 455 sinfo64.si_addr = ua_cr2; 456 457 switch (ut->uu_code) { 458 case EXC_I386_GPFLT: 459 /* CR2 is meaningless after GP fault */ 460 /* XXX namespace clash! */ 461 sinfo64.si_addr = 0ULL; 462 sinfo64.si_code = 0; 463 break; 464 case KERN_PROTECTION_FAILURE: 465 sinfo64.si_code = SEGV_ACCERR; 466 break; 467 case KERN_INVALID_ADDRESS: 468 sinfo64.si_code = SEGV_MAPERR; 469 break; 470 default: 471 sinfo64.si_code = FPE_NOOP; 472 } 473 break; 474 default: 475 { 476 int status_and_exitcode; 477 478 /* 479 * All other signals need to fill out a minimum set of 480 * information for the siginfo structure passed into 481 * the signal handler, if SA_SIGINFO was specified. 482 * 483 * p->si_status actually contains both the status and 484 * the exit code; we save it off in its own variable 485 * for later breakdown. 486 */ 487 proc_lock(p); 488 sinfo64.si_pid = p->si_pid; 489 p->si_pid =0; 490 status_and_exitcode = p->si_status; 491 p->si_status = 0; 492 sinfo64.si_uid = p->si_uid; 493 p->si_uid =0; 494 sinfo64.si_code = p->si_code; 495 p->si_code = 0; 496 proc_unlock(p); 497 if (sinfo64.si_code == CLD_EXITED) { 498 if (WIFEXITED(status_and_exitcode)) 499 sinfo64.si_code = CLD_EXITED; 500 else if (WIFSIGNALED(status_and_exitcode)) { 501 if (WCOREDUMP(status_and_exitcode)) { 502 sinfo64.si_code = CLD_DUMPED; 503 status_and_exitcode = W_EXITCODE(status_and_exitcode,status_and_exitcode); 504 } else { 505 sinfo64.si_code = CLD_KILLED; 506 status_and_exitcode = W_EXITCODE(status_and_exitcode,status_and_exitcode); 507 } 508 } 509 } 510 /* 511 * The recorded status contains the exit code and the 512 * signal information, but the information to be passed 513 * in the siginfo to the handler is supposed to only 514 * contain the status, so we have to shift it out. 515 */ 516 sinfo64.si_status = WEXITSTATUS(status_and_exitcode); 517 break; 518 } 519 } 520 if (proc_is64bit(p)) { 521 user64_siginfo_t sinfo64_user64; 522 523 bzero((caddr_t)&sinfo64_user64, sizeof(sinfo64_user64)); 524 525 siginfo_user_to_user64_x86(&sinfo64,&sinfo64_user64); 526 527 #if CONFIG_DTRACE 528 bzero((caddr_t)&(ut->t_dtrace_siginfo), sizeof(ut->t_dtrace_siginfo)); 529 530 ut->t_dtrace_siginfo.si_signo = sinfo64.si_signo; 531 ut->t_dtrace_siginfo.si_code = sinfo64.si_code; 532 ut->t_dtrace_siginfo.si_pid = sinfo64.si_pid; 533 ut->t_dtrace_siginfo.si_uid = sinfo64.si_uid; 534 ut->t_dtrace_siginfo.si_status = sinfo64.si_status; 535 /* XXX truncates faulting address to void * on K32 */ 536 ut->t_dtrace_siginfo.si_addr = CAST_DOWN(void *, sinfo64.si_addr); 537 538 /* Fire DTrace proc:::fault probe when signal is generated by hardware. */ 539 switch (sig) { 540 case SIGILL: case SIGBUS: case SIGSEGV: case SIGFPE: case SIGTRAP: 541 DTRACE_PROC2(fault, int, (int)(ut->uu_code), siginfo_t *, &(ut->t_dtrace_siginfo)); 542 break; 543 default: 544 break; 545 } 546 547 /* XXX truncates catcher address to uintptr_t */ 548 DTRACE_PROC3(signal__handle, int, sig, siginfo_t *, &(ut->t_dtrace_siginfo), 549 void (*)(void), CAST_DOWN(sig_t, ua_catcher)); 550 #endif /* CONFIG_DTRACE */ 551 552 if (copyout((caddr_t)&sinfo64_user64, ua_sip, sizeof (sinfo64_user64))) 553 goto bad; 554 555 flavor = x86_THREAD_STATE64; 556 state_count = x86_THREAD_STATE64_COUNT; 557 state = (void *)&mctxp->mctx_avx64.ss; 558 } else { 559 x86_thread_state32_t *tstate32; 560 user32_siginfo_t sinfo32; 561 562 bzero((caddr_t)&sinfo32, sizeof(sinfo32)); 563 564 siginfo_user_to_user32_x86(&sinfo64,&sinfo32); 565 566 #if CONFIG_DTRACE 567 bzero((caddr_t)&(ut->t_dtrace_siginfo), sizeof(ut->t_dtrace_siginfo)); 568 569 ut->t_dtrace_siginfo.si_signo = sinfo32.si_signo; 570 ut->t_dtrace_siginfo.si_code = sinfo32.si_code; 571 ut->t_dtrace_siginfo.si_pid = sinfo32.si_pid; 572 ut->t_dtrace_siginfo.si_uid = sinfo32.si_uid; 573 ut->t_dtrace_siginfo.si_status = sinfo32.si_status; 574 ut->t_dtrace_siginfo.si_addr = CAST_DOWN(void *, sinfo32.si_addr); 575 576 /* Fire DTrace proc:::fault probe when signal is generated by hardware. */ 577 switch (sig) { 578 case SIGILL: case SIGBUS: case SIGSEGV: case SIGFPE: case SIGTRAP: 579 DTRACE_PROC2(fault, int, (int)(ut->uu_code), siginfo_t *, &(ut->t_dtrace_siginfo)); 580 break; 581 default: 582 break; 583 } 584 585 DTRACE_PROC3(signal__handle, int, sig, siginfo_t *, &(ut->t_dtrace_siginfo), 586 void (*)(void), CAST_DOWN(sig_t, ua_catcher)); 587 #endif /* CONFIG_DTRACE */ 588 589 if (copyout((caddr_t)&sinfo32, ua_sip, sizeof (sinfo32))) 590 goto bad; 591 592 tstate32 = &mctxp->mctx_avx32.ss; 593 594 tstate32->eip = CAST_DOWN_EXPLICIT(user32_addr_t, trampact); 595 tstate32->esp = CAST_DOWN_EXPLICIT(user32_addr_t, ua_fp); 596 597 tstate32->eflags = get_eflags_exportmask(); 598 599 tstate32->cs = USER_CS; 600 tstate32->ss = USER_DS; 601 tstate32->ds = USER_DS; 602 tstate32->es = USER_DS; 603 tstate32->fs = NULL_SEG; 604 tstate32->gs = USER_CTHREAD; 605 606 flavor = x86_THREAD_STATE32; 607 state_count = x86_THREAD_STATE32_COUNT; 608 state = (void *)tstate32; 609 } 610 if (thread_setstatus(thread, flavor, (thread_state_t)state, state_count) != KERN_SUCCESS) 611 goto bad; 612 ml_fp_setvalid(FALSE); 613 614 /* Tell the PAL layer about the signal */ 615 pal_set_signal_delivery( thread ); 616 617 proc_lock(p); 618 619 return; 620 621 bad: 622 623 proc_lock(p); 624 SIGACTION(p, SIGILL) = SIG_DFL; 625 sig = sigmask(SIGILL); 626 p->p_sigignore &= ~sig; 627 p->p_sigcatch &= ~sig; 628 ut->uu_sigmask &= ~sig; 629 /* sendsig is called with signal lock held */ 630 proc_unlock(p); 631 psignal_locked(p, SIGILL); 632 proc_lock(p); 633 return; 634 } 635 636 /* 637 * System call to cleanup state after a signal 638 * has been taken. Reset signal mask and 639 * stack state from context left by sendsig (above). 640 * Return to previous pc and psl as specified by 641 * context left by sendsig. Check carefully to 642 * make sure that the user has not modified the 643 * psl to gain improper priviledges or to cause 644 * a machine fault. 645 */ 646 647 int 648 sigreturn(struct proc *p, struct sigreturn_args *uap, __unused int *retval) 649 { 650 union { 651 struct mcontext_avx32 mctx_avx32; 652 struct mcontext_avx64 mctx_avx64; 653 } mctx_store, *mctxp = &mctx_store; 654 655 thread_t thread = current_thread(); 656 struct uthread * ut; 657 int error; 658 int onstack = 0; 659 660 mach_msg_type_number_t ts_count; 661 unsigned int ts_flavor; 662 void * ts; 663 mach_msg_type_number_t fs_count; 664 unsigned int fs_flavor; 665 void * fs; 666 int rval = EJUSTRETURN; 667 boolean_t sig_avx; 668 669 ut = (struct uthread *)get_bsdthread_info(thread); 670 671 /* 672 * If we are being asked to change the altstack flag on the thread, we 673 * just set/reset it and return (the uap->uctx is not used). 674 */ 675 if ((unsigned int)uap->infostyle == UC_SET_ALT_STACK) { 676 ut->uu_sigstk.ss_flags |= SA_ONSTACK; 677 return (0); 678 } else if ((unsigned int)uap->infostyle == UC_RESET_ALT_STACK) { 679 ut->uu_sigstk.ss_flags &= ~SA_ONSTACK; 680 return (0); 681 } 682 683 bzero(mctxp, sizeof(*mctxp)); 684 sig_avx = ml_fpu_avx_enabled(); 685 686 if (proc_is64bit(p)) { 687 struct user_ucontext64 uctx64; 688 689 if ((error = copyin(uap->uctx, (void *)&uctx64, sizeof (uctx64)))) 690 return(error); 691 692 if ((error = copyin(uctx64.uc_mcontext64, (void *)&mctxp->mctx_avx64, sizeof (struct mcontext_avx64)))) 693 return(error); 694 695 onstack = uctx64.uc_onstack & 01; 696 ut->uu_sigmask = uctx64.uc_sigmask & ~sigcantmask; 697 698 ts_flavor = x86_THREAD_STATE64; 699 ts_count = x86_THREAD_STATE64_COUNT; 700 ts = (void *)&mctxp->mctx_avx64.ss; 701 702 if (sig_avx) { 703 fs_flavor = x86_AVX_STATE64; 704 fs_count = x86_AVX_STATE64_COUNT; 705 } 706 else { 707 fs_flavor = x86_FLOAT_STATE64; 708 fs_count = x86_FLOAT_STATE64_COUNT; 709 } 710 711 fs = (void *)&mctxp->mctx_avx64.fs; 712 713 } else { 714 struct user_ucontext32 uctx32; 715 716 if ((error = copyin(uap->uctx, (void *)&uctx32, sizeof (uctx32)))) 717 return(error); 718 719 if ((error = copyin(CAST_USER_ADDR_T(uctx32.uc_mcontext), (void *)&mctxp->mctx_avx32, sizeof (struct mcontext_avx32)))) 720 return(error); 721 722 onstack = uctx32.uc_onstack & 01; 723 ut->uu_sigmask = uctx32.uc_sigmask & ~sigcantmask; 724 725 ts_flavor = x86_THREAD_STATE32; 726 ts_count = x86_THREAD_STATE32_COUNT; 727 ts = (void *)&mctxp->mctx_avx32.ss; 728 729 if (sig_avx) { 730 fs_flavor = x86_AVX_STATE32; 731 fs_count = x86_AVX_STATE32_COUNT; 732 } 733 else { 734 fs_flavor = x86_FLOAT_STATE32; 735 fs_count = x86_FLOAT_STATE32_COUNT; 736 } 737 738 fs = (void *)&mctxp->mctx_avx32.fs; 739 } 740 741 if (onstack) 742 ut->uu_sigstk.ss_flags |= SA_ONSTACK; 743 else 744 ut->uu_sigstk.ss_flags &= ~SA_ONSTACK; 745 746 if (ut->uu_siglist & ~ut->uu_sigmask) 747 signal_setast(thread); 748 /* 749 * thread_set_state() does all the needed checks for the passed in 750 * content 751 */ 752 if (thread_setstatus(thread, ts_flavor, ts, ts_count) != KERN_SUCCESS) { 753 rval = EINVAL; 754 goto error_ret; 755 } 756 757 ml_fp_setvalid(TRUE); 758 759 if (thread_setstatus(thread, fs_flavor, fs, fs_count) != KERN_SUCCESS) { 760 rval = EINVAL; 761 goto error_ret; 762 763 } 764 error_ret: 765 return rval; 766 } 767 768 769 /* 770 * machine_exception() performs MD translation 771 * of a mach exception to a unix signal and code. 772 */ 773 774 boolean_t 775 machine_exception( 776 int exception, 777 mach_exception_code_t code, 778 __unused mach_exception_subcode_t subcode, 779 int *unix_signal, 780 mach_exception_code_t *unix_code) 781 { 782 783 switch(exception) { 784 785 case EXC_BAD_ACCESS: 786 /* Map GP fault to SIGSEGV, otherwise defer to caller */ 787 if (code == EXC_I386_GPFLT) { 788 *unix_signal = SIGSEGV; 789 *unix_code = code; 790 break; 791 } 792 return(FALSE); 793 794 case EXC_BAD_INSTRUCTION: 795 *unix_signal = SIGILL; 796 *unix_code = code; 797 break; 798 799 case EXC_ARITHMETIC: 800 *unix_signal = SIGFPE; 801 *unix_code = code; 802 break; 803 804 case EXC_SOFTWARE: 805 if (code == EXC_I386_BOUND) { 806 /* 807 * Map #BR, the Bound Range Exceeded exception, to 808 * SIGTRAP. 809 */ 810 *unix_signal = SIGTRAP; 811 *unix_code = code; 812 break; 813 } 814 815 default: 816 return(FALSE); 817 } 818 819 return(TRUE); 820 } 821
Cache object: df8b30a499cf331c5d847ff96ad7ea65
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