| 4 |
|
* Derived from Bruno Haible's work on his SIGSEGV library for clisp |
| 5 |
|
* <http://clisp.sourceforge.net/> |
| 6 |
|
* |
| 7 |
+ |
* MacOS X support derived from the post by Timothy J. Wood to the |
| 8 |
+ |
* omnigroup macosx-dev list: |
| 9 |
+ |
* Mach Exception Handlers 101 (Was Re: ptrace, gdb) |
| 10 |
+ |
* tjw@omnigroup.com Sun, 4 Jun 2000 |
| 11 |
+ |
* www.omnigroup.com/mailman/archive/macosx-dev/2000-June/002030.html |
| 12 |
+ |
* |
| 13 |
|
* Basilisk II (C) 1997-2002 Christian Bauer |
| 14 |
|
* |
| 15 |
|
* This program is free software; you can redistribute it and/or modify |
| 212 |
|
|
| 213 |
|
#if HAVE_SIGINFO_T |
| 214 |
|
// Generic extended signal handler |
| 215 |
+ |
#define SIGSEGV_FAULT_HANDLER sigsegv_fault_handler |
| 216 |
|
#if defined(__NetBSD__) || defined(__FreeBSD__) |
| 217 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS) |
| 218 |
|
#else |
| 219 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 220 |
|
#endif |
| 221 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, siginfo_t *sip, void *scp |
| 222 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, sip, scp |
| 223 |
|
#define SIGSEGV_FAULT_ADDRESS sip->si_addr |
| 224 |
|
#if defined(__NetBSD__) || defined(__FreeBSD__) |
| 225 |
|
#if (defined(i386) || defined(__i386__)) |
| 256 |
|
#endif |
| 257 |
|
|
| 258 |
|
#if HAVE_SIGCONTEXT_SUBTERFUGE |
| 259 |
+ |
#define SIGSEGV_FAULT_HANDLER sigsegv_fault_handler |
| 260 |
|
// Linux kernels prior to 2.4 ? |
| 261 |
|
#if defined(__linux__) |
| 262 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 263 |
|
#if (defined(i386) || defined(__i386__)) |
| 264 |
|
#include <asm/sigcontext.h> |
| 265 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext scs |
| 266 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, scs |
| 267 |
|
#define SIGSEGV_FAULT_ADDRESS scs.cr2 |
| 268 |
|
#define SIGSEGV_FAULT_INSTRUCTION scs.eip |
| 269 |
|
#define SIGSEGV_REGISTER_FILE (unsigned int *)(&scs) |
| 272 |
|
#if (defined(sparc) || defined(__sparc__)) |
| 273 |
|
#include <asm/sigcontext.h> |
| 274 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp, char *addr |
| 275 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr |
| 276 |
|
#define SIGSEGV_FAULT_ADDRESS addr |
| 277 |
|
#endif |
| 278 |
|
#if (defined(powerpc) || defined(__powerpc__)) |
| 279 |
|
#include <asm/sigcontext.h> |
| 280 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp |
| 281 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, scp |
| 282 |
|
#define SIGSEGV_FAULT_ADDRESS scp->regs->dar |
| 283 |
|
#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip |
| 284 |
|
#define SIGSEGV_REGISTER_FILE (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr) |
| 287 |
|
#if (defined(alpha) || defined(__alpha__)) |
| 288 |
|
#include <asm/sigcontext.h> |
| 289 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 290 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp |
| 291 |
|
#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp) |
| 292 |
|
#define SIGSEGV_FAULT_INSTRUCTION scp->sc_pc |
| 293 |
|
|
| 306 |
|
#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4)) |
| 307 |
|
#include <ucontext.h> |
| 308 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 309 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp |
| 310 |
|
#define SIGSEGV_FAULT_ADDRESS scp->sc_badvaddr |
| 311 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 312 |
|
#endif |
| 314 |
|
// HP-UX |
| 315 |
|
#if (defined(hpux) || defined(__hpux__)) |
| 316 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 317 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp |
| 318 |
|
#define SIGSEGV_FAULT_ADDRESS scp->sc_sl.sl_ss.ss_narrow.ss_cr21 |
| 319 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS) |
| 320 |
|
#endif |
| 323 |
|
#if defined(__osf__) |
| 324 |
|
#include <ucontext.h> |
| 325 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 326 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp |
| 327 |
|
#define SIGSEGV_FAULT_ADDRESS scp->sc_traparg_a0 |
| 328 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 329 |
|
#endif |
| 331 |
|
// AIX |
| 332 |
|
#if defined(_AIX) |
| 333 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 334 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp |
| 335 |
|
#define SIGSEGV_FAULT_ADDRESS scp->sc_jmpbuf.jmp_context.o_vaddr |
| 336 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 337 |
|
#endif |
| 341 |
|
#if (defined(m68k) || defined(__m68k__)) |
| 342 |
|
#include <m68k/frame.h> |
| 343 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 344 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp |
| 345 |
|
#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp) |
| 346 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 347 |
|
|
| 367 |
|
} |
| 368 |
|
#else |
| 369 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, void *scp, char *addr |
| 370 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr |
| 371 |
|
#define SIGSEGV_FAULT_ADDRESS addr |
| 372 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS) |
| 373 |
|
#endif |
| 374 |
|
#endif |
| 375 |
|
|
| 376 |
< |
// MacOS X |
| 376 |
> |
// MacOS X, not sure which version this works in. Under 10.1 |
| 377 |
> |
// vm_protect does not appear to work from a signal handler. Under |
| 378 |
> |
// 10.2 signal handlers get siginfo type arguments but the si_addr |
| 379 |
> |
// field is the address of the faulting instruction and not the |
| 380 |
> |
// address that caused the SIGBUS. Maybe this works in 10.0? In any |
| 381 |
> |
// case with Mach exception handlers there is a way to do what this |
| 382 |
> |
// was meant to do. |
| 383 |
> |
#ifndef HAVE_MACH_EXCEPTIONS |
| 384 |
|
#if defined(__APPLE__) && defined(__MACH__) |
| 385 |
|
#if (defined(ppc) || defined(__ppc__)) |
| 386 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 387 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp |
| 388 |
|
#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp) |
| 389 |
|
#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir |
| 390 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS) |
| 404 |
|
#endif |
| 405 |
|
#endif |
| 406 |
|
#endif |
| 407 |
+ |
#endif |
| 408 |
+ |
|
| 409 |
+ |
#if HAVE_MACH_EXCEPTIONS |
| 410 |
+ |
|
| 411 |
+ |
// This can easily be extended to other Mach systems, but really who |
| 412 |
+ |
// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU |
| 413 |
+ |
// Mach 2.5/3.0? |
| 414 |
+ |
#if defined(__APPLE__) && defined(__MACH__) |
| 415 |
+ |
|
| 416 |
+ |
#include <sys/types.h> |
| 417 |
+ |
#include <stdlib.h> |
| 418 |
+ |
#include <stdio.h> |
| 419 |
+ |
#include <pthread.h> |
| 420 |
+ |
|
| 421 |
+ |
/* |
| 422 |
+ |
* If you are familiar with MIG then you will understand the frustration |
| 423 |
+ |
* that was necessary to get these embedded into C++ code by hand. |
| 424 |
+ |
*/ |
| 425 |
+ |
extern "C" { |
| 426 |
+ |
#include <mach/mach.h> |
| 427 |
+ |
#include <mach/mach_error.h> |
| 428 |
+ |
|
| 429 |
+ |
extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *); |
| 430 |
+ |
extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t, |
| 431 |
+ |
mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t); |
| 432 |
+ |
extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t, |
| 433 |
+ |
exception_type_t, exception_data_t, mach_msg_type_number_t); |
| 434 |
+ |
extern kern_return_t exception_raise_state(mach_port_t, exception_type_t, |
| 435 |
+ |
exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *, |
| 436 |
+ |
thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *); |
| 437 |
+ |
extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t, |
| 438 |
+ |
exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *, |
| 439 |
+ |
thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *); |
| 440 |
+ |
} |
| 441 |
+ |
|
| 442 |
+ |
// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE |
| 443 |
+ |
#define HANDLER_COUNT 64 |
| 444 |
+ |
|
| 445 |
+ |
// structure to tuck away existing exception handlers |
| 446 |
+ |
typedef struct _ExceptionPorts { |
| 447 |
+ |
mach_msg_type_number_t maskCount; |
| 448 |
+ |
exception_mask_t masks[HANDLER_COUNT]; |
| 449 |
+ |
exception_handler_t handlers[HANDLER_COUNT]; |
| 450 |
+ |
exception_behavior_t behaviors[HANDLER_COUNT]; |
| 451 |
+ |
thread_state_flavor_t flavors[HANDLER_COUNT]; |
| 452 |
+ |
} ExceptionPorts; |
| 453 |
+ |
|
| 454 |
+ |
// exception handler thread |
| 455 |
+ |
static pthread_t exc_thread; |
| 456 |
+ |
|
| 457 |
+ |
// place where old exception handler info is stored |
| 458 |
+ |
static ExceptionPorts ports; |
| 459 |
+ |
|
| 460 |
+ |
// our exception port |
| 461 |
+ |
static mach_port_t _exceptionPort = MACH_PORT_NULL; |
| 462 |
+ |
|
| 463 |
+ |
#define MACH_CHECK_ERROR(name,ret) \ |
| 464 |
+ |
if (ret != KERN_SUCCESS) { \ |
| 465 |
+ |
mach_error(#name, ret); \ |
| 466 |
+ |
exit (1); \ |
| 467 |
+ |
} |
| 468 |
+ |
|
| 469 |
+ |
#define SIGSEGV_FAULT_ADDRESS code[1] |
| 470 |
+ |
#define SIGSEGV_FAULT_INSTRUCTION get_fault_instruction(thread, state) |
| 471 |
+ |
#define SIGSEGV_FAULT_HANDLER (code[0] == KERN_PROTECTION_FAILURE) && sigsegv_fault_handler |
| 472 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGLIST mach_port_t thread, exception_data_t code, ppc_thread_state_t *state |
| 473 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGS thread, code, &state |
| 474 |
+ |
#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction |
| 475 |
+ |
#define SIGSEGV_REGISTER_FILE &state->srr0, &state->r0 |
| 476 |
+ |
|
| 477 |
+ |
// Given a suspended thread, stuff the current instruction and |
| 478 |
+ |
// registers into state. |
| 479 |
+ |
// |
| 480 |
+ |
// It would have been nice to have this be ppc/x86 independant which |
| 481 |
+ |
// could have been done easily with a thread_state_t instead of |
| 482 |
+ |
// ppc_thread_state_t, but because of the way this is called it is |
| 483 |
+ |
// easier to do it this way. |
| 484 |
+ |
#if (defined(ppc) || defined(__ppc__)) |
| 485 |
+ |
static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state) |
| 486 |
+ |
{ |
| 487 |
+ |
kern_return_t krc; |
| 488 |
+ |
mach_msg_type_number_t count; |
| 489 |
+ |
|
| 490 |
+ |
count = MACHINE_THREAD_STATE_COUNT; |
| 491 |
+ |
krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count); |
| 492 |
+ |
MACH_CHECK_ERROR (thread_get_state, krc); |
| 493 |
+ |
|
| 494 |
+ |
return (sigsegv_address_t)state->srr0; |
| 495 |
+ |
} |
| 496 |
+ |
#endif |
| 497 |
+ |
|
| 498 |
+ |
// Since there can only be one exception thread running at any time |
| 499 |
+ |
// this is not a problem. |
| 500 |
+ |
#define MSG_SIZE 512 |
| 501 |
+ |
static char msgbuf[MSG_SIZE]; |
| 502 |
+ |
static char replybuf[MSG_SIZE]; |
| 503 |
+ |
|
| 504 |
+ |
/* |
| 505 |
+ |
* This is the entry point for the exception handler thread. The job |
| 506 |
+ |
* of this thread is to wait for exception messages on the exception |
| 507 |
+ |
* port that was setup beforehand and to pass them on to exc_server. |
| 508 |
+ |
* exc_server is a MIG generated function that is a part of Mach. |
| 509 |
+ |
* Its job is to decide what to do with the exception message. In our |
| 510 |
+ |
* case exc_server calls catch_exception_raise on our behalf. After |
| 511 |
+ |
* exc_server returns, it is our responsibility to send the reply. |
| 512 |
+ |
*/ |
| 513 |
+ |
static void * |
| 514 |
+ |
handleExceptions(void *priv) |
| 515 |
+ |
{ |
| 516 |
+ |
mach_msg_header_t *msg, *reply; |
| 517 |
+ |
kern_return_t krc; |
| 518 |
+ |
|
| 519 |
+ |
msg = (mach_msg_header_t *)msgbuf; |
| 520 |
+ |
reply = (mach_msg_header_t *)replybuf; |
| 521 |
+ |
|
| 522 |
+ |
for (;;) { |
| 523 |
+ |
krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE, |
| 524 |
+ |
_exceptionPort, 0, MACH_PORT_NULL); |
| 525 |
+ |
MACH_CHECK_ERROR(mach_msg, krc); |
| 526 |
+ |
|
| 527 |
+ |
if (!exc_server(msg, reply)) { |
| 528 |
+ |
fprintf(stderr, "exc_server hated the message\n"); |
| 529 |
+ |
exit(1); |
| 530 |
+ |
} |
| 531 |
+ |
|
| 532 |
+ |
krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0, |
| 533 |
+ |
msg->msgh_local_port, 0, MACH_PORT_NULL); |
| 534 |
+ |
if (krc != KERN_SUCCESS) { |
| 535 |
+ |
fprintf(stderr, "Error sending message to original reply port, krc = %d, %s", |
| 536 |
+ |
krc, mach_error_string(krc)); |
| 537 |
+ |
exit(1); |
| 538 |
+ |
} |
| 539 |
+ |
} |
| 540 |
+ |
} |
| 541 |
+ |
#endif |
| 542 |
+ |
#endif |
| 543 |
|
|
| 544 |
|
|
| 545 |
|
/* |
| 790 |
|
* SIGSEGV global handler |
| 791 |
|
*/ |
| 792 |
|
|
| 793 |
< |
#ifdef HAVE_SIGSEGV_RECOVERY |
| 794 |
< |
static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST) |
| 793 |
> |
#if defined(HAVE_SIGSEGV_RECOVERY) || defined(HAVE_MACH_EXCEPTIONS) |
| 794 |
> |
// This function handles the badaccess to memory. |
| 795 |
> |
// It is called from the signal handler or the exception handler. |
| 796 |
> |
static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST) |
| 797 |
|
{ |
| 798 |
|
sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS; |
| 799 |
|
sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION; |
| 635 |
– |
bool fault_recovered = false; |
| 800 |
|
|
| 801 |
|
// Call user's handler and reinstall the global handler, if required |
| 802 |
|
switch (sigsegv_fault_handler(fault_address, fault_instruction)) { |
| 803 |
|
case SIGSEGV_RETURN_SUCCESS: |
| 804 |
< |
#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL)) |
| 805 |
< |
sigsegv_do_install_handler(sig); |
| 642 |
< |
#endif |
| 643 |
< |
fault_recovered = true; |
| 644 |
< |
break; |
| 804 |
> |
return true; |
| 805 |
> |
|
| 806 |
|
#if HAVE_SIGSEGV_SKIP_INSTRUCTION |
| 807 |
|
case SIGSEGV_RETURN_SKIP_INSTRUCTION: |
| 808 |
< |
// Call the instruction skipper with the register file available |
| 809 |
< |
if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) |
| 810 |
< |
fault_recovered = true; |
| 808 |
> |
// Call the instruction skipper with the register file |
| 809 |
> |
// available |
| 810 |
> |
if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) { |
| 811 |
> |
#ifdef HAVE_MACH_EXCEPTIONS |
| 812 |
> |
// Unlike UNIX signals where the thread state |
| 813 |
> |
// is modified off of the stack, in Mach we |
| 814 |
> |
// need to actually call thread_set_state to |
| 815 |
> |
// have the register values updated. |
| 816 |
> |
kern_return_t krc; |
| 817 |
> |
|
| 818 |
> |
krc = thread_set_state(thread, |
| 819 |
> |
MACHINE_THREAD_STATE, (thread_state_t)state, |
| 820 |
> |
MACHINE_THREAD_STATE_COUNT); |
| 821 |
> |
MACH_CHECK_ERROR (thread_get_state, krc); |
| 822 |
> |
#endif |
| 823 |
> |
return true; |
| 824 |
> |
} |
| 825 |
|
break; |
| 826 |
|
#endif |
| 827 |
|
} |
| 828 |
+ |
|
| 829 |
+ |
// We can't do anything with the fault_address, dump state? |
| 830 |
+ |
if (sigsegv_state_dumper != 0) |
| 831 |
+ |
sigsegv_state_dumper(fault_address, fault_instruction); |
| 832 |
+ |
|
| 833 |
+ |
return false; |
| 834 |
+ |
} |
| 835 |
+ |
#endif |
| 836 |
+ |
|
| 837 |
+ |
|
| 838 |
+ |
/* |
| 839 |
+ |
* There are two mechanisms for handling a bad memory access, |
| 840 |
+ |
* Mach exceptions and UNIX signals. The implementation specific |
| 841 |
+ |
* code appears below. Its reponsibility is to call handle_badaccess |
| 842 |
+ |
* which is the routine that handles the fault in an implementation |
| 843 |
+ |
* agnostic manner. The implementation specific code below is then |
| 844 |
+ |
* reponsible for checking whether handle_badaccess was able |
| 845 |
+ |
* to handle the memory access error and perform any implementation |
| 846 |
+ |
* specific tasks necessary afterwards. |
| 847 |
+ |
*/ |
| 848 |
+ |
|
| 849 |
+ |
#ifdef HAVE_MACH_EXCEPTIONS |
| 850 |
+ |
/* |
| 851 |
+ |
* We need to forward all exceptions that we do not handle. |
| 852 |
+ |
* This is important, there are many exceptions that may be |
| 853 |
+ |
* handled by other exception handlers. For example debuggers |
| 854 |
+ |
* use exceptions and the exception hander is in another |
| 855 |
+ |
* process in such a case. (Timothy J. Wood states in his |
| 856 |
+ |
* message to the list that he based this code on that from |
| 857 |
+ |
* gdb for Darwin.) |
| 858 |
+ |
*/ |
| 859 |
+ |
static inline kern_return_t |
| 860 |
+ |
forward_exception(mach_port_t thread_port, |
| 861 |
+ |
mach_port_t task_port, |
| 862 |
+ |
exception_type_t exception_type, |
| 863 |
+ |
exception_data_t exception_data, |
| 864 |
+ |
mach_msg_type_number_t data_count, |
| 865 |
+ |
ExceptionPorts *oldExceptionPorts) |
| 866 |
+ |
{ |
| 867 |
+ |
kern_return_t kret; |
| 868 |
+ |
unsigned int portIndex; |
| 869 |
+ |
mach_port_t port; |
| 870 |
+ |
exception_behavior_t behavior; |
| 871 |
+ |
thread_state_flavor_t flavor; |
| 872 |
+ |
thread_state_t thread_state; |
| 873 |
+ |
mach_msg_type_number_t thread_state_count; |
| 874 |
+ |
|
| 875 |
+ |
for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) { |
| 876 |
+ |
if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) { |
| 877 |
+ |
// This handler wants the exception |
| 878 |
+ |
break; |
| 879 |
+ |
} |
| 880 |
+ |
} |
| 881 |
+ |
|
| 882 |
+ |
if (portIndex >= oldExceptionPorts->maskCount) { |
| 883 |
+ |
fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type); |
| 884 |
+ |
return KERN_FAILURE; |
| 885 |
+ |
} |
| 886 |
+ |
|
| 887 |
+ |
port = oldExceptionPorts->handlers[portIndex]; |
| 888 |
+ |
behavior = oldExceptionPorts->behaviors[portIndex]; |
| 889 |
+ |
flavor = oldExceptionPorts->flavors[portIndex]; |
| 890 |
+ |
|
| 891 |
+ |
/* |
| 892 |
+ |
fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor); |
| 893 |
+ |
*/ |
| 894 |
+ |
|
| 895 |
+ |
if (behavior != EXCEPTION_DEFAULT) { |
| 896 |
+ |
thread_state_count = THREAD_STATE_MAX; |
| 897 |
+ |
kret = thread_get_state (thread_port, flavor, thread_state, |
| 898 |
+ |
&thread_state_count); |
| 899 |
+ |
MACH_CHECK_ERROR (thread_get_state, kret); |
| 900 |
+ |
} |
| 901 |
+ |
|
| 902 |
+ |
switch (behavior) { |
| 903 |
+ |
case EXCEPTION_DEFAULT: |
| 904 |
+ |
// fprintf(stderr, "forwarding to exception_raise\n"); |
| 905 |
+ |
kret = exception_raise(port, thread_port, task_port, exception_type, |
| 906 |
+ |
exception_data, data_count); |
| 907 |
+ |
MACH_CHECK_ERROR (exception_raise, kret); |
| 908 |
+ |
break; |
| 909 |
+ |
case EXCEPTION_STATE: |
| 910 |
+ |
// fprintf(stderr, "forwarding to exception_raise_state\n"); |
| 911 |
+ |
kret = exception_raise_state(port, exception_type, exception_data, |
| 912 |
+ |
data_count, &flavor, |
| 913 |
+ |
thread_state, thread_state_count, |
| 914 |
+ |
thread_state, &thread_state_count); |
| 915 |
+ |
MACH_CHECK_ERROR (exception_raise_state, kret); |
| 916 |
+ |
break; |
| 917 |
+ |
case EXCEPTION_STATE_IDENTITY: |
| 918 |
+ |
// fprintf(stderr, "forwarding to exception_raise_state_identity\n"); |
| 919 |
+ |
kret = exception_raise_state_identity(port, thread_port, task_port, |
| 920 |
+ |
exception_type, exception_data, |
| 921 |
+ |
data_count, &flavor, |
| 922 |
+ |
thread_state, thread_state_count, |
| 923 |
+ |
thread_state, &thread_state_count); |
| 924 |
+ |
MACH_CHECK_ERROR (exception_raise_state_identity, kret); |
| 925 |
+ |
break; |
| 926 |
+ |
default: |
| 927 |
+ |
fprintf(stderr, "forward_exception got unknown behavior\n"); |
| 928 |
+ |
break; |
| 929 |
+ |
} |
| 930 |
+ |
|
| 931 |
+ |
if (behavior != EXCEPTION_DEFAULT) { |
| 932 |
+ |
kret = thread_set_state (thread_port, flavor, thread_state, |
| 933 |
+ |
thread_state_count); |
| 934 |
+ |
MACH_CHECK_ERROR (thread_set_state, kret); |
| 935 |
+ |
} |
| 936 |
+ |
|
| 937 |
+ |
return KERN_SUCCESS; |
| 938 |
+ |
} |
| 939 |
+ |
|
| 940 |
+ |
/* |
| 941 |
+ |
* This is the code that actually handles the exception. |
| 942 |
+ |
* It is called by exc_server. For Darwin 5 Apple changed |
| 943 |
+ |
* this a bit from how this family of functions worked in |
| 944 |
+ |
* Mach. If you are familiar with that it is a little |
| 945 |
+ |
* different. The main variation that concerns us here is |
| 946 |
+ |
* that code is an array of exception specific codes and |
| 947 |
+ |
* codeCount is a count of the number of codes in the code |
| 948 |
+ |
* array. In typical Mach all exceptions have a code |
| 949 |
+ |
* and sub-code. It happens to be the case that for a |
| 950 |
+ |
* EXC_BAD_ACCESS exception the first entry is the type of |
| 951 |
+ |
* bad access that occurred and the second entry is the |
| 952 |
+ |
* faulting address so these entries correspond exactly to |
| 953 |
+ |
* how the code and sub-code are used on Mach. |
| 954 |
+ |
* |
| 955 |
+ |
* This is a MIG interface. No code in Basilisk II should |
| 956 |
+ |
* call this directley. This has to have external C |
| 957 |
+ |
* linkage because that is what exc_server expects. |
| 958 |
+ |
*/ |
| 959 |
+ |
kern_return_t |
| 960 |
+ |
catch_exception_raise(mach_port_t exception_port, |
| 961 |
+ |
mach_port_t thread, |
| 962 |
+ |
mach_port_t task, |
| 963 |
+ |
exception_type_t exception, |
| 964 |
+ |
exception_data_t code, |
| 965 |
+ |
mach_msg_type_number_t codeCount) |
| 966 |
+ |
{ |
| 967 |
+ |
ppc_thread_state_t state; |
| 968 |
+ |
kern_return_t krc; |
| 969 |
+ |
|
| 970 |
+ |
if ((exception == EXC_BAD_ACCESS) && (codeCount >= 2)) { |
| 971 |
+ |
if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) |
| 972 |
+ |
return KERN_SUCCESS; |
| 973 |
+ |
} |
| 974 |
+ |
|
| 975 |
+ |
// In Mach we do not need to remove the exception handler. |
| 976 |
+ |
// If we forward the exception, eventually some exception handler |
| 977 |
+ |
// will take care of this exception. |
| 978 |
+ |
krc = forward_exception(thread, task, exception, code, codeCount, &ports); |
| 979 |
+ |
|
| 980 |
+ |
return krc; |
| 981 |
+ |
} |
| 982 |
+ |
#endif |
| 983 |
+ |
|
| 984 |
+ |
#ifdef HAVE_SIGSEGV_RECOVERY |
| 985 |
+ |
// Handle bad memory accesses with signal handler |
| 986 |
+ |
static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST) |
| 987 |
+ |
{ |
| 988 |
+ |
// Call handler and reinstall the global handler, if required |
| 989 |
+ |
if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) { |
| 990 |
+ |
#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL)) |
| 991 |
+ |
sigsegv_do_install_handler(sig); |
| 992 |
+ |
#endif |
| 993 |
+ |
return; |
| 994 |
+ |
} |
| 995 |
|
|
| 996 |
< |
if (!fault_recovered) { |
| 655 |
< |
// Failure: reinstall default handler for "safe" crash |
| 996 |
> |
// Failure: reinstall default handler for "safe" crash |
| 997 |
|
#define FAULT_HANDLER(sig) signal(sig, SIG_DFL); |
| 998 |
< |
SIGSEGV_ALL_SIGNALS |
| 998 |
> |
SIGSEGV_ALL_SIGNALS |
| 999 |
|
#undef FAULT_HANDLER |
| 659 |
– |
|
| 660 |
– |
// We can't do anything with the fault_address, dump state? |
| 661 |
– |
if (sigsegv_state_dumper != 0) |
| 662 |
– |
sigsegv_state_dumper(fault_address, fault_instruction); |
| 663 |
– |
} |
| 1000 |
|
} |
| 1001 |
|
#endif |
| 1002 |
|
|
| 1041 |
|
} |
| 1042 |
|
#endif |
| 1043 |
|
|
| 1044 |
< |
bool sigsegv_install_handler(sigsegv_fault_handler_t handler) |
| 1044 |
> |
#if defined(HAVE_MACH_EXCEPTIONS) |
| 1045 |
> |
static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler) |
| 1046 |
|
{ |
| 1047 |
< |
#ifdef HAVE_SIGSEGV_RECOVERY |
| 1047 |
> |
/* |
| 1048 |
> |
* Except for the exception port functions, this should be |
| 1049 |
> |
* pretty much stock Mach. If later you choose to support |
| 1050 |
> |
* other Mach's besides Darwin, just check for __MACH__ |
| 1051 |
> |
* here and __APPLE__ where the actual differences are. |
| 1052 |
> |
*/ |
| 1053 |
> |
#if defined(__APPLE__) && defined(__MACH__) |
| 1054 |
> |
if (sigsegv_fault_handler != NULL) { |
| 1055 |
> |
sigsegv_fault_handler = handler; |
| 1056 |
> |
return true; |
| 1057 |
> |
} |
| 1058 |
> |
|
| 1059 |
> |
kern_return_t krc; |
| 1060 |
> |
|
| 1061 |
> |
// create the the exception port |
| 1062 |
> |
krc = mach_port_allocate(mach_task_self(), |
| 1063 |
> |
MACH_PORT_RIGHT_RECEIVE, &_exceptionPort); |
| 1064 |
> |
if (krc != KERN_SUCCESS) { |
| 1065 |
> |
mach_error("mach_port_allocate", krc); |
| 1066 |
> |
return false; |
| 1067 |
> |
} |
| 1068 |
> |
|
| 1069 |
> |
// add a port send right |
| 1070 |
> |
krc = mach_port_insert_right(mach_task_self(), |
| 1071 |
> |
_exceptionPort, _exceptionPort, |
| 1072 |
> |
MACH_MSG_TYPE_MAKE_SEND); |
| 1073 |
> |
if (krc != KERN_SUCCESS) { |
| 1074 |
> |
mach_error("mach_port_insert_right", krc); |
| 1075 |
> |
return false; |
| 1076 |
> |
} |
| 1077 |
> |
|
| 1078 |
> |
// get the old exception ports |
| 1079 |
> |
ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]); |
| 1080 |
> |
krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks, |
| 1081 |
> |
&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors); |
| 1082 |
> |
if (krc != KERN_SUCCESS) { |
| 1083 |
> |
mach_error("thread_get_exception_ports", krc); |
| 1084 |
> |
return false; |
| 1085 |
> |
} |
| 1086 |
> |
|
| 1087 |
> |
// set the new exception port |
| 1088 |
> |
// |
| 1089 |
> |
// We could have used EXCEPTION_STATE_IDENTITY instead of |
| 1090 |
> |
// EXCEPTION_DEFAULT to get the thread state in the initial |
| 1091 |
> |
// message, but it turns out that in the common case this is not |
| 1092 |
> |
// neccessary. If we need it we can later ask for it from the |
| 1093 |
> |
// suspended thread. |
| 1094 |
> |
// |
| 1095 |
> |
// Even with THREAD_STATE_NONE, Darwin provides the program |
| 1096 |
> |
// counter in the thread state. The comments in the header file |
| 1097 |
> |
// seem to imply that you can count on the GPR's on an exception |
| 1098 |
> |
// as well but just to be safe I use MACHINE_THREAD_STATE because |
| 1099 |
> |
// you have to ask for all of the GPR's anyway just to get the |
| 1100 |
> |
// program counter. In any case because of update effective |
| 1101 |
> |
// address from immediate and update address from effective |
| 1102 |
> |
// addresses of ra and rb modes (as good an name as any for these |
| 1103 |
> |
// addressing modes) used in PPC instructions, you will need the |
| 1104 |
> |
// GPR state anyway. |
| 1105 |
> |
krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort, |
| 1106 |
> |
EXCEPTION_DEFAULT, MACHINE_THREAD_STATE); |
| 1107 |
> |
if (krc != KERN_SUCCESS) { |
| 1108 |
> |
mach_error("thread_set_exception_ports", krc); |
| 1109 |
> |
return false; |
| 1110 |
> |
} |
| 1111 |
> |
|
| 1112 |
> |
// create the exception handler thread |
| 1113 |
> |
if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) { |
| 1114 |
> |
(void)fprintf(stderr, "creation of exception thread failed\n"); |
| 1115 |
> |
return false; |
| 1116 |
> |
} |
| 1117 |
> |
|
| 1118 |
> |
// do not care about the exception thread any longer, let is run standalone |
| 1119 |
> |
(void)pthread_detach(exc_thread); |
| 1120 |
> |
|
| 1121 |
|
sigsegv_fault_handler = handler; |
| 1122 |
+ |
return true; |
| 1123 |
+ |
#else |
| 1124 |
+ |
return false; |
| 1125 |
+ |
#endif |
| 1126 |
+ |
} |
| 1127 |
+ |
#endif |
| 1128 |
+ |
|
| 1129 |
+ |
bool sigsegv_install_handler(sigsegv_fault_handler_t handler) |
| 1130 |
+ |
{ |
| 1131 |
+ |
#if defined(HAVE_SIGSEGV_RECOVERY) |
| 1132 |
|
bool success = true; |
| 1133 |
|
#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig); |
| 1134 |
|
SIGSEGV_ALL_SIGNALS |
| 1135 |
|
#undef FAULT_HANDLER |
| 1136 |
+ |
if (success) |
| 1137 |
+ |
sigsegv_fault_handler = handler; |
| 1138 |
|
return success; |
| 1139 |
+ |
#elif defined(HAVE_MACH_EXCEPTIONS) |
| 1140 |
+ |
return sigsegv_do_install_handler(handler); |
| 1141 |
|
#else |
| 1142 |
|
// FAIL: no siginfo_t nor sigcontext subterfuge is available |
| 1143 |
|
return false; |
| 1151 |
|
|
| 1152 |
|
void sigsegv_deinstall_handler(void) |
| 1153 |
|
{ |
| 1154 |
+ |
// We do nothing for Mach exceptions, the thread would need to be |
| 1155 |
+ |
// suspended if not already so, and we might mess with other |
| 1156 |
+ |
// exception handlers that came after we registered ours. There is |
| 1157 |
+ |
// no need to remove the exception handler, in fact this function is |
| 1158 |
+ |
// not called anywhere in Basilisk II. |
| 1159 |
|
#ifdef HAVE_SIGSEGV_RECOVERY |
| 1160 |
|
sigsegv_fault_handler = 0; |
| 1161 |
|
#define FAULT_HANDLER(sig) signal(sig, SIG_DFL); |
