[ViewVC] Diff of: cebix/BasiliskII/src/Unix/sigsegv.cpp

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.15 by gbeauche, 2002-05-20T16:00:07Z vs.
Revision 1.32 by gbeauche, 2003-10-21T21:59:41Z

#	Line 4 \| Line 4
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
#	Line 29 \| Line 35
35		#include "config.h"
36		#endif
37
38	+	#include <list>
39		#include <signal.h>
40		#include "sigsegv.h"
41
42	+	#ifndef NO_STD_NAMESPACE
43	+	using std::list;
44	+	#endif
45	+
46		// Return value type of a signal handler (standard type if not defined)
47		#ifndef RETSIGTYPE
48		#define RETSIGTYPE void
#	Line 40 \| Line 51
51		// Type of the system signal handler
52		typedef RETSIGTYPE (*signal_handler)(int);
53
43	–	// Is the fault to be ignored?
44	–	static bool sigsegv_ignore_fault = false;
45	–
54		// User's SIGSEGV handler
55		static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
56
#	Line 57 \| Line 65 \| static bool sigsegv_do_install_handler(i
65		* Instruction decoding aids
66		*/
67
60	–	// Transfer type
61	–	enum transfer_type_t {
62	–	TYPE_UNKNOWN,
63	–	TYPE_LOAD,
64	–	TYPE_STORE
65	–	};
66	–
68		// Transfer size
69		enum transfer_size_t {
70		SIZE_UNKNOWN,
#	Line 72 \| Line 73 \| enum transfer_size_t {
73		SIZE_LONG
74		};
75
76	+	// Transfer type
77	+	typedef sigsegv_transfer_type_t transfer_type_t;
78	+
79		#if (defined(powerpc) \|\| defined(__powerpc__) \|\| defined(__ppc__))
80		// Addressing mode
81		enum addressing_mode_t {
#	Line 103 \| Line 107 \| static void powerpc_decode_instruction(i
107		signed int imm = (signed short)(opcode & 0xffff);
108
109		// Analyze opcode
110	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
110	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
111		transfer_size_t transfer_size = SIZE_UNKNOWN;
112		addressing_mode_t addr_mode = MODE_UNKNOWN;
113		switch (primop) {
114		case 31:
115		switch (exop) {
116		case 23: // lwzx
117	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
117	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
118		case 55: // lwzux
119	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
119	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
120		case 87: // lbzx
121	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
121	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
122		case 119: // lbzux
123	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
123	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
124		case 151: // stwx
125	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
125	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
126		case 183: // stwux
127	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
127	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
128		case 215: // stbx
129	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
129	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
130		case 247: // stbux
131	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
131	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
132		case 279: // lhzx
133	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
133	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
134		case 311: // lhzux
135	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
135	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
136		case 343: // lhax
137	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
137	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
138		case 375: // lhaux
139	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
139	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
140		case 407: // sthx
141	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
141	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
142		case 439: // sthux
143	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
143	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
144		}
145		break;
146
147		case 32: // lwz
148	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
148	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
149		case 33: // lwzu
150	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
150	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
151		case 34: // lbz
152	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
152	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
153		case 35: // lbzu
154	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
154	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
155		case 36: // stw
156	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
156	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
157		case 37: // stwu
158	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
158	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
159		case 38: // stb
160	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
160	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
161		case 39: // stbu
162	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
162	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
163		case 40: // lhz
164	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
164	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
165		case 41: // lhzu
166	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
166	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
167		case 42: // lha
168	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
168	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
169		case 43: // lhau
170	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
170	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
171		case 44: // sth
172	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
172	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
173		case 45: // sthu
174	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
174	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
175		}
176
177		// Calculate effective address
#	Line 214 \| Line 218 \| static void powerpc_decode_instruction(i
218		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
219		#endif
220		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, siginfo_t sip, void scp
221	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t sip, void scp
222	+	#define SIGSEGV_FAULT_HANDLER_ARGS sip, scp
223		#define SIGSEGV_FAULT_ADDRESS sip->si_addr
224	+	#if defined(__sun__)
225	+	#if (defined(sparc) \|\| defined(__sparc__))
226	+	#include <sys/ucontext.h>
227	+	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
228	+	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[REG_PC]
229	+	#endif
230	+	#endif
231	+	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
232	+	#if (defined(i386) \|\| defined(__i386__))
233	+	#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext *)scp)->sc_eip)
234	+	#define SIGSEGV_REGISTER_FILE ((unsigned int )&(((struct sigcontext )scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
235	+	#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
236	+	#endif
237	+	#endif
238		#if defined(__linux__)
239		#if (defined(i386) \|\| defined(__i386__))
240		#include <sys/ucontext.h>
#	Line 223 \| Line 243 \| static void powerpc_decode_instruction(i
243		#define SIGSEGV_REGISTER_FILE (unsigned int *)SIGSEGV_CONTEXT_REGS
244		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
245		#endif
246	+	#if (defined(x86_64) \|\| defined(__x86_64__))
247	+	#include <sys/ucontext.h>
248	+	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
249	+	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
250	+	#define SIGSEGV_REGISTER_FILE (unsigned long *)SIGSEGV_CONTEXT_REGS
251	+	#endif
252		#if (defined(ia64) \|\| defined(__ia64__))
253		#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext )scp)->sc_ip & ~0x3ULL) / slot number is in bits 0 and 1 */
254		#endif
#	Line 243 \| Line 269 \| static void powerpc_decode_instruction(i
269		#if (defined(i386) \|\| defined(__i386__))
270		#include <asm/sigcontext.h>
271		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext scs
272	<	#define SIGSEGV_FAULT_ADDRESS scs.cr2
273	<	#define SIGSEGV_FAULT_INSTRUCTION scs.eip
274	<	#define SIGSEGV_REGISTER_FILE (unsigned long *)(&scs)
272	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
273	>	#define SIGSEGV_FAULT_HANDLER_ARGS &scs
274	>	#define SIGSEGV_FAULT_ADDRESS scp->cr2
275	>	#define SIGSEGV_FAULT_INSTRUCTION scp->eip
276	>	#define SIGSEGV_REGISTER_FILE (unsigned int *)scp
277		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
278		#endif
279		#if (defined(sparc) \|\| defined(__sparc__))
280		#include <asm/sigcontext.h>
281		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext scp, char addr
282	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr
283		#define SIGSEGV_FAULT_ADDRESS addr
284		#endif
285		#if (defined(powerpc) \|\| defined(__powerpc__))
286		#include <asm/sigcontext.h>
287		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp
288	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, scp
289		#define SIGSEGV_FAULT_ADDRESS scp->regs->dar
290		#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip
291		#define SIGSEGV_REGISTER_FILE (unsigned int )&scp->regs->nip, (unsigned int )(scp->regs->gpr)
#	Line 264 \| Line 294 \| static void powerpc_decode_instruction(i
294		#if (defined(alpha) \|\| defined(__alpha__))
295		#include <asm/sigcontext.h>
296		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
297	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
298		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
299		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_pc
300
#	Line 282 \| Line 313 \| static sigsegv_address_t get_fault_addre
313		#if (defined(sgi) \|\| defined(__sgi)) && (defined(SYSTYPE_SVR4) \|\| defined(__SYSTYPE_SVR4))
314		#include <ucontext.h>
315		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
316	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
317		#define SIGSEGV_FAULT_ADDRESS scp->sc_badvaddr
318		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
319		#endif
#	Line 289 \| Line 321 \| static sigsegv_address_t get_fault_addre
321		// HP-UX
322		#if (defined(hpux) \|\| defined(__hpux__))
323		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
324	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
325		#define SIGSEGV_FAULT_ADDRESS scp->sc_sl.sl_ss.ss_narrow.ss_cr21
326		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
327		#endif
#	Line 297 \| Line 330 \| static sigsegv_address_t get_fault_addre
330		#if defined(__osf__)
331		#include <ucontext.h>
332		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
333	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
334		#define SIGSEGV_FAULT_ADDRESS scp->sc_traparg_a0
335		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
336		#endif
#	Line 304 \| Line 338 \| static sigsegv_address_t get_fault_addre
338		// AIX
339		#if defined(_AIX)
340		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
341	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
342		#define SIGSEGV_FAULT_ADDRESS scp->sc_jmpbuf.jmp_context.o_vaddr
343		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
344		#endif
#	Line 313 \| Line 348 \| static sigsegv_address_t get_fault_addre
348		#if (defined(m68k) \|\| defined(__m68k__))
349		#include <m68k/frame.h>
350		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
351	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
352		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
353		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
354
#	Line 338 \| Line 374 \| static sigsegv_address_t get_fault_addre
374		}
375		#else
376		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, void scp, char addr
377	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr
378		#define SIGSEGV_FAULT_ADDRESS addr
379		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
380		#endif
381		#endif
382
383	<	// MacOS X
383	>	// MacOS X, not sure which version this works in. Under 10.1
384	>	// vm_protect does not appear to work from a signal handler. Under
385	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
386	>	// field is the address of the faulting instruction and not the
387	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
388	>	// case with Mach exception handlers there is a way to do what this
389	>	// was meant to do.
390	>	#ifndef HAVE_MACH_EXCEPTIONS
391		#if defined(__APPLE__) && defined(__MACH__)
392		#if (defined(ppc) \|\| defined(__ppc__))
393		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
394	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
395		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
396		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir
397		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
#	Line 366 \| Line 411 \| static sigsegv_address_t get_fault_addre
411		#endif
412		#endif
413		#endif
414	+	#endif
415	+
416	+	#if HAVE_MACH_EXCEPTIONS
417	+
418	+	// This can easily be extended to other Mach systems, but really who
419	+	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
420	+	// Mach 2.5/3.0?
421	+	#if defined(__APPLE__) && defined(__MACH__)
422	+
423	+	#include <sys/types.h>
424	+	#include <stdlib.h>
425	+	#include <stdio.h>
426	+	#include <pthread.h>
427	+
428	+	/*
429	+	* If you are familiar with MIG then you will understand the frustration
430	+	* that was necessary to get these embedded into C++ code by hand.
431	+	*/
432	+	extern "C" {
433	+	#include <mach/mach.h>
434	+	#include <mach/mach_error.h>
435	+
436	+	extern boolean_t exc_server(mach_msg_header_t , mach_msg_header_t );
437	+	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
438	+	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
439	+	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
440	+	exception_type_t, exception_data_t, mach_msg_type_number_t);
441	+	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
442	+	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
443	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
444	+	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
445	+	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
446	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
447	+	}
448	+
449	+	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
450	+	#define HANDLER_COUNT 64
451	+
452	+	// structure to tuck away existing exception handlers
453	+	typedef struct _ExceptionPorts {
454	+	mach_msg_type_number_t maskCount;
455	+	exception_mask_t masks[HANDLER_COUNT];
456	+	exception_handler_t handlers[HANDLER_COUNT];
457	+	exception_behavior_t behaviors[HANDLER_COUNT];
458	+	thread_state_flavor_t flavors[HANDLER_COUNT];
459	+	} ExceptionPorts;
460	+
461	+	// exception handler thread
462	+	static pthread_t exc_thread;
463	+
464	+	// place where old exception handler info is stored
465	+	static ExceptionPorts ports;
466	+
467	+	// our exception port
468	+	static mach_port_t _exceptionPort = MACH_PORT_NULL;
469	+
470	+	#define MACH_CHECK_ERROR(name,ret) \
471	+	if (ret != KERN_SUCCESS) { \
472	+	mach_error(#name, ret); \
473	+	exit (1); \
474	+	}
475	+
476	+	#define SIGSEGV_FAULT_ADDRESS code[1]
477	+	#define SIGSEGV_FAULT_INSTRUCTION get_fault_instruction(thread, state)
478	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP) ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
479	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
480	+	#define SIGSEGV_FAULT_HANDLER_ARGS thread, code, &state
481	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
482	+	#define SIGSEGV_REGISTER_FILE &state->srr0, &state->r0
483	+
484	+	// Given a suspended thread, stuff the current instruction and
485	+	// registers into state.
486	+	//
487	+	// It would have been nice to have this be ppc/x86 independant which
488	+	// could have been done easily with a thread_state_t instead of
489	+	// ppc_thread_state_t, but because of the way this is called it is
490	+	// easier to do it this way.
491	+	#if (defined(ppc) \|\| defined(__ppc__))
492	+	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
493	+	{
494	+	kern_return_t krc;
495	+	mach_msg_type_number_t count;
496	+
497	+	count = MACHINE_THREAD_STATE_COUNT;
498	+	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
499	+	MACH_CHECK_ERROR (thread_get_state, krc);
500	+
501	+	return (sigsegv_address_t)state->srr0;
502	+	}
503	+	#endif
504	+
505	+	// Since there can only be one exception thread running at any time
506	+	// this is not a problem.
507	+	#define MSG_SIZE 512
508	+	static char msgbuf[MSG_SIZE];
509	+	static char replybuf[MSG_SIZE];
510	+
511	+	/*
512	+	* This is the entry point for the exception handler thread. The job
513	+	* of this thread is to wait for exception messages on the exception
514	+	* port that was setup beforehand and to pass them on to exc_server.
515	+	* exc_server is a MIG generated function that is a part of Mach.
516	+	* Its job is to decide what to do with the exception message. In our
517	+	* case exc_server calls catch_exception_raise on our behalf. After
518	+	* exc_server returns, it is our responsibility to send the reply.
519	+	*/
520	+	static void *
521	+	handleExceptions(void *priv)
522	+	{
523	+	mach_msg_header_t msg, reply;
524	+	kern_return_t krc;
525	+
526	+	msg = (mach_msg_header_t *)msgbuf;
527	+	reply = (mach_msg_header_t *)replybuf;
528	+
529	+	for (;;) {
530	+	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
531	+	_exceptionPort, 0, MACH_PORT_NULL);
532	+	MACH_CHECK_ERROR(mach_msg, krc);
533	+
534	+	if (!exc_server(msg, reply)) {
535	+	fprintf(stderr, "exc_server hated the message\n");
536	+	exit(1);
537	+	}
538	+
539	+	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
540	+	msg->msgh_local_port, 0, MACH_PORT_NULL);
541	+	if (krc != KERN_SUCCESS) {
542	+	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
543	+	krc, mach_error_string(krc));
544	+	exit(1);
545	+	}
546	+	}
547	+	}
548	+	#endif
549	+	#endif
550
551
552		/*
#	Line 388 \| Line 569 \| enum {
569		X86_REG_EDI = 4
570		};
571		#endif
572	+	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
573	+	enum {
574	+	X86_REG_EIP = 10,
575	+	X86_REG_EAX = 7,
576	+	X86_REG_ECX = 6,
577	+	X86_REG_EDX = 5,
578	+	X86_REG_EBX = 4,
579	+	X86_REG_ESP = 13,
580	+	X86_REG_EBP = 2,
581	+	X86_REG_ESI = 1,
582	+	X86_REG_EDI = 0
583	+	};
584	+	#endif
585		// FIXME: this is partly redundant with the instruction decoding phase
586		// to discover transfer type and register number
587		static inline int ix86_step_over_modrm(unsigned char * p)
#	Line 429 \| Line 623 \| static bool ix86_skip_instruction(unsign
623		if (eip == 0)
624		return false;
625
626	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
626	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
627		transfer_size_t transfer_size = SIZE_LONG;
628
629		int reg = -1;
#	Line 444 \| Line 638 \| static bool ix86_skip_instruction(unsign
638
639		// Decode instruction
640		switch (eip[0]) {
641	+	case 0x0f:
642	+	switch (eip[1]) {
643	+	case 0xb6: // MOVZX r32, r/m8
644	+	case 0xb7: // MOVZX r32, r/m16
645	+	switch (eip[2] & 0xc0) {
646	+	case 0x80:
647	+	reg = (eip[2] >> 3) & 7;
648	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
649	+	break;
650	+	case 0x40:
651	+	reg = (eip[2] >> 3) & 7;
652	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
653	+	break;
654	+	case 0x00:
655	+	reg = (eip[2] >> 3) & 7;
656	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
657	+	break;
658	+	}
659	+	len += 3 + ix86_step_over_modrm(eip + 2);
660	+	break;
661	+	}
662	+	break;
663		case 0x8a: // MOV r8, r/m8
664		transfer_size = SIZE_BYTE;
665		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
666		switch (eip[1] & 0xc0) {
667		case 0x80:
668		reg = (eip[1] >> 3) & 7;
669	<	transfer_type = TYPE_LOAD;
669	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
670		break;
671		case 0x40:
672		reg = (eip[1] >> 3) & 7;
673	<	transfer_type = TYPE_LOAD;
673	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
674		break;
675		case 0x00:
676		reg = (eip[1] >> 3) & 7;
677	<	transfer_type = TYPE_LOAD;
677	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
678		break;
679		}
680		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 469 \| Line 685 \| static bool ix86_skip_instruction(unsign
685		switch (eip[1] & 0xc0) {
686		case 0x80:
687		reg = (eip[1] >> 3) & 7;
688	<	transfer_type = TYPE_STORE;
688	>	transfer_type = SIGSEGV_TRANSFER_STORE;
689		break;
690		case 0x40:
691		reg = (eip[1] >> 3) & 7;
692	<	transfer_type = TYPE_STORE;
692	>	transfer_type = SIGSEGV_TRANSFER_STORE;
693		break;
694		case 0x00:
695		reg = (eip[1] >> 3) & 7;
696	<	transfer_type = TYPE_STORE;
696	>	transfer_type = SIGSEGV_TRANSFER_STORE;
697		break;
698		}
699		len += 2 + ix86_step_over_modrm(eip + 1);
700		break;
701		}
702
703	<	if (transfer_type == TYPE_UNKNOWN) {
703	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
704		// Unknown machine code, let it crash. Then patch the decoder
705		return false;
706		}
707
708	<	if (transfer_type == TYPE_LOAD && reg != -1) {
708	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
709		static const int x86_reg_map[8] = {
710		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
711		X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
#	Line 515 \| Line 731 \| static bool ix86_skip_instruction(unsign
731		#if DEBUG
732		printf("%08x: %s %s access", regs[X86_REG_EIP],
733		transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
734	<	transfer_type == TYPE_LOAD ? "read" : "write");
734	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
735
736		if (reg != -1) {
737		static const char * x86_reg_str_map[8] = {
738		"eax", "ecx", "edx", "ebx",
739		"esp", "ebp", "esi", "edi"
740		};
741	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
741	>	printf(" %s register %%%s", transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from", x86_reg_str_map[reg]);
742		}
743		printf(", %d bytes instruction\n", len);
744		#endif
#	Line 539 \| Line 755 \| static bool powerpc_skip_instruction(uns
755		instruction_t instr;
756		powerpc_decode_instruction(&instr, *nip_p, regs);
757
758	<	if (instr.transfer_type == TYPE_UNKNOWN) {
758	>	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
759		// Unknown machine code, let it crash. Then patch the decoder
760		return false;
761		}
#	Line 547 \| Line 763 \| static bool powerpc_skip_instruction(uns
763		#if DEBUG
764		printf("%08x: %s %s access", *nip_p,
765		instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
766	<	instr.transfer_type == TYPE_LOAD ? "read" : "write");
766	>	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
767
768		if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
769		printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
770	<	if (instr.transfer_type == TYPE_LOAD)
770	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
771		printf(" r%d (rd = 0)\n", instr.rd);
772		#endif
773
774		if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
775		regs[instr.ra] = instr.addr;
776	<	if (instr.transfer_type == TYPE_LOAD)
776	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
777		regs[instr.rd] = 0;
778
779		*nip_p += 4;
#	Line 570 \| Line 786 \| static bool powerpc_skip_instruction(uns
786		#ifndef SIGSEGV_FAULT_INSTRUCTION
787		#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_INVALID_PC
788		#endif
789	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
790	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
791	+	#endif
792	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
793	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP) sigsegv_fault_handler(ADDR, IP)
794	+	#endif
795
796		// SIGSEGV recovery supported ?
797		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 581 \| Line 803 \| static bool powerpc_skip_instruction(uns
803		* SIGSEGV global handler
804		*/
805
806	<	#ifdef HAVE_SIGSEGV_RECOVERY
807	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
806	>	#if defined(HAVE_SIGSEGV_RECOVERY) \|\| defined(HAVE_MACH_EXCEPTIONS)
807	>	// This function handles the badaccess to memory.
808	>	// It is called from the signal handler or the exception handler.
809	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
810		{
811		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
812		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
589	–	bool fault_recovered = false;
813
814		// Call user's handler and reinstall the global handler, if required
815	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
816	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
817	<	sigsegv_do_install_handler(sig);
815	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
816	>	case SIGSEGV_RETURN_SUCCESS:
817	>	return true;
818	>
819	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
820	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
821	>	// Call the instruction skipper with the register file
822	>	// available
823	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
824	>	#ifdef HAVE_MACH_EXCEPTIONS
825	>	// Unlike UNIX signals where the thread state
826	>	// is modified off of the stack, in Mach we
827	>	// need to actually call thread_set_state to
828	>	// have the register values updated.
829	>	kern_return_t krc;
830	>
831	>	krc = thread_set_state(thread,
832	>	MACHINE_THREAD_STATE, (thread_state_t)state,
833	>	MACHINE_THREAD_STATE_COUNT);
834	>	MACH_CHECK_ERROR (thread_get_state, krc);
835	>	#endif
836	>	return true;
837	>	}
838	>	break;
839		#endif
596	–	fault_recovered = true;
840		}
841	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
842	<	else if (sigsegv_ignore_fault) {
843	<	// Call the instruction skipper with the register file available
844	<	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
845	<	fault_recovered = true;
841	>
842	>	// We can't do anything with the fault_address, dump state?
843	>	if (sigsegv_state_dumper != 0)
844	>	sigsegv_state_dumper(fault_address, fault_instruction);
845	>
846	>	return false;
847	>	}
848	>	#endif
849	>
850	>
851	>	/*
852	>	* There are two mechanisms for handling a bad memory access,
853	>	* Mach exceptions and UNIX signals. The implementation specific
854	>	* code appears below. Its reponsibility is to call handle_badaccess
855	>	* which is the routine that handles the fault in an implementation
856	>	* agnostic manner. The implementation specific code below is then
857	>	* reponsible for checking whether handle_badaccess was able
858	>	* to handle the memory access error and perform any implementation
859	>	* specific tasks necessary afterwards.
860	>	*/
861	>
862	>	#ifdef HAVE_MACH_EXCEPTIONS
863	>	/*
864	>	* We need to forward all exceptions that we do not handle.
865	>	* This is important, there are many exceptions that may be
866	>	* handled by other exception handlers. For example debuggers
867	>	* use exceptions and the exception hander is in another
868	>	* process in such a case. (Timothy J. Wood states in his
869	>	* message to the list that he based this code on that from
870	>	* gdb for Darwin.)
871	>	*/
872	>	static inline kern_return_t
873	>	forward_exception(mach_port_t thread_port,
874	>	mach_port_t task_port,
875	>	exception_type_t exception_type,
876	>	exception_data_t exception_data,
877	>	mach_msg_type_number_t data_count,
878	>	ExceptionPorts *oldExceptionPorts)
879	>	{
880	>	kern_return_t kret;
881	>	unsigned int portIndex;
882	>	mach_port_t port;
883	>	exception_behavior_t behavior;
884	>	thread_state_flavor_t flavor;
885	>	thread_state_t thread_state;
886	>	mach_msg_type_number_t thread_state_count;
887	>
888	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
889	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
890	>	// This handler wants the exception
891	>	break;
892	>	}
893	>	}
894	>
895	>	if (portIndex >= oldExceptionPorts->maskCount) {
896	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
897	>	return KERN_FAILURE;
898	>	}
899	>
900	>	port = oldExceptionPorts->handlers[portIndex];
901	>	behavior = oldExceptionPorts->behaviors[portIndex];
902	>	flavor = oldExceptionPorts->flavors[portIndex];
903	>
904	>	/*
905	>	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
906	>	*/
907	>
908	>	if (behavior != EXCEPTION_DEFAULT) {
909	>	thread_state_count = THREAD_STATE_MAX;
910	>	kret = thread_get_state (thread_port, flavor, thread_state,
911	>	&thread_state_count);
912	>	MACH_CHECK_ERROR (thread_get_state, kret);
913		}
914	+
915	+	switch (behavior) {
916	+	case EXCEPTION_DEFAULT:
917	+	// fprintf(stderr, "forwarding to exception_raise\n");
918	+	kret = exception_raise(port, thread_port, task_port, exception_type,
919	+	exception_data, data_count);
920	+	MACH_CHECK_ERROR (exception_raise, kret);
921	+	break;
922	+	case EXCEPTION_STATE:
923	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
924	+	kret = exception_raise_state(port, exception_type, exception_data,
925	+	data_count, &flavor,
926	+	thread_state, thread_state_count,
927	+	thread_state, &thread_state_count);
928	+	MACH_CHECK_ERROR (exception_raise_state, kret);
929	+	break;
930	+	case EXCEPTION_STATE_IDENTITY:
931	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
932	+	kret = exception_raise_state_identity(port, thread_port, task_port,
933	+	exception_type, exception_data,
934	+	data_count, &flavor,
935	+	thread_state, thread_state_count,
936	+	thread_state, &thread_state_count);
937	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
938	+	break;
939	+	default:
940	+	fprintf(stderr, "forward_exception got unknown behavior\n");
941	+	break;
942	+	}
943	+
944	+	if (behavior != EXCEPTION_DEFAULT) {
945	+	kret = thread_set_state (thread_port, flavor, thread_state,
946	+	thread_state_count);
947	+	MACH_CHECK_ERROR (thread_set_state, kret);
948	+	}
949	+
950	+	return KERN_SUCCESS;
951	+	}
952	+
953	+	/*
954	+	* This is the code that actually handles the exception.
955	+	* It is called by exc_server. For Darwin 5 Apple changed
956	+	* this a bit from how this family of functions worked in
957	+	* Mach. If you are familiar with that it is a little
958	+	* different. The main variation that concerns us here is
959	+	* that code is an array of exception specific codes and
960	+	* codeCount is a count of the number of codes in the code
961	+	* array. In typical Mach all exceptions have a code
962	+	* and sub-code. It happens to be the case that for a
963	+	* EXC_BAD_ACCESS exception the first entry is the type of
964	+	* bad access that occurred and the second entry is the
965	+	* faulting address so these entries correspond exactly to
966	+	* how the code and sub-code are used on Mach.
967	+	*
968	+	* This is a MIG interface. No code in Basilisk II should
969	+	* call this directley. This has to have external C
970	+	* linkage because that is what exc_server expects.
971	+	*/
972	+	kern_return_t
973	+	catch_exception_raise(mach_port_t exception_port,
974	+	mach_port_t thread,
975	+	mach_port_t task,
976	+	exception_type_t exception,
977	+	exception_data_t code,
978	+	mach_msg_type_number_t codeCount)
979	+	{
980	+	ppc_thread_state_t state;
981	+	kern_return_t krc;
982	+
983	+	if ((exception == EXC_BAD_ACCESS) && (codeCount >= 2)) {
984	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
985	+	return KERN_SUCCESS;
986	+	}
987	+
988	+	// In Mach we do not need to remove the exception handler.
989	+	// If we forward the exception, eventually some exception handler
990	+	// will take care of this exception.
991	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
992	+
993	+	return krc;
994	+	}
995	+	#endif
996	+
997	+	#ifdef HAVE_SIGSEGV_RECOVERY
998	+	// Handle bad memory accesses with signal handler
999	+	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1000	+	{
1001	+	// Call handler and reinstall the global handler, if required
1002	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1003	+	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1004	+	sigsegv_do_install_handler(sig);
1005		#endif
1006	+	return;
1007	+	}
1008
1009	<	if (!fault_recovered) {
607	<	// FAIL: reinstall default handler for "safe" crash
1009	>	// Failure: reinstall default handler for "safe" crash
1010		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1011	<	SIGSEGV_ALL_SIGNALS
1011	>	SIGSEGV_ALL_SIGNALS
1012		#undef FAULT_HANDLER
611	–
612	–	// We can't do anything with the fault_address, dump state?
613	–	if (sigsegv_state_dumper != 0)
614	–	sigsegv_state_dumper(fault_address, fault_instruction);
615	–	}
1013		}
1014		#endif
1015
#	Line 626 \| Line 1023 \| static bool sigsegv_do_install_handler(i
1023		{
1024		// Setup SIGSEGV handler to process writes to frame buffer
1025		#ifdef HAVE_SIGACTION
1026	<	struct sigaction vosf_sa;
1027	<	sigemptyset(&vosf_sa.sa_mask);
1028	<	vosf_sa.sa_sigaction = sigsegv_handler;
1029	<	vosf_sa.sa_flags = SA_SIGINFO;
1030	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1026	>	struct sigaction sigsegv_sa;
1027	>	sigemptyset(&sigsegv_sa.sa_mask);
1028	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1029	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1030	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1031		#else
1032		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1033		#endif
#	Line 642 \| Line 1039 \| static bool sigsegv_do_install_handler(i
1039		{
1040		// Setup SIGSEGV handler to process writes to frame buffer
1041		#ifdef HAVE_SIGACTION
1042	<	struct sigaction vosf_sa;
1043	<	sigemptyset(&vosf_sa.sa_mask);
1044	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1042	>	struct sigaction sigsegv_sa;
1043	>	sigemptyset(&sigsegv_sa.sa_mask);
1044	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1045	>	sigsegv_sa.sa_flags = 0;
1046		#if !EMULATED_68K && defined(__NetBSD__)
1047	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1048	<	vosf_sa.sa_flags = SA_ONSTACK;
651	<	#else
652	<	vosf_sa.sa_flags = 0;
1047	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1048	>	sigsegv_sa.sa_flags \|= SA_ONSTACK;
1049		#endif
1050	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1050	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1051		#else
1052		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1053		#endif
1054		}
1055		#endif
1056
1057	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1057	>	#if defined(HAVE_MACH_EXCEPTIONS)
1058	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1059		{
1060	<	#ifdef HAVE_SIGSEGV_RECOVERY
1060	>	/*
1061	>	* Except for the exception port functions, this should be
1062	>	* pretty much stock Mach. If later you choose to support
1063	>	* other Mach's besides Darwin, just check for __MACH__
1064	>	* here and __APPLE__ where the actual differences are.
1065	>	*/
1066	>	#if defined(__APPLE__) && defined(__MACH__)
1067	>	if (sigsegv_fault_handler != NULL) {
1068	>	sigsegv_fault_handler = handler;
1069	>	return true;
1070	>	}
1071	>
1072	>	kern_return_t krc;
1073	>
1074	>	// create the the exception port
1075	>	krc = mach_port_allocate(mach_task_self(),
1076	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1077	>	if (krc != KERN_SUCCESS) {
1078	>	mach_error("mach_port_allocate", krc);
1079	>	return false;
1080	>	}
1081	>
1082	>	// add a port send right
1083	>	krc = mach_port_insert_right(mach_task_self(),
1084	>	_exceptionPort, _exceptionPort,
1085	>	MACH_MSG_TYPE_MAKE_SEND);
1086	>	if (krc != KERN_SUCCESS) {
1087	>	mach_error("mach_port_insert_right", krc);
1088	>	return false;
1089	>	}
1090	>
1091	>	// get the old exception ports
1092	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1093	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1094	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1095	>	if (krc != KERN_SUCCESS) {
1096	>	mach_error("thread_get_exception_ports", krc);
1097	>	return false;
1098	>	}
1099	>
1100	>	// set the new exception port
1101	>	//
1102	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1103	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1104	>	// message, but it turns out that in the common case this is not
1105	>	// neccessary. If we need it we can later ask for it from the
1106	>	// suspended thread.
1107	>	//
1108	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1109	>	// counter in the thread state. The comments in the header file
1110	>	// seem to imply that you can count on the GPR's on an exception
1111	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1112	>	// you have to ask for all of the GPR's anyway just to get the
1113	>	// program counter. In any case because of update effective
1114	>	// address from immediate and update address from effective
1115	>	// addresses of ra and rb modes (as good an name as any for these
1116	>	// addressing modes) used in PPC instructions, you will need the
1117	>	// GPR state anyway.
1118	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1119	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1120	>	if (krc != KERN_SUCCESS) {
1121	>	mach_error("thread_set_exception_ports", krc);
1122	>	return false;
1123	>	}
1124	>
1125	>	// create the exception handler thread
1126	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1127	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1128	>	return false;
1129	>	}
1130	>
1131	>	// do not care about the exception thread any longer, let is run standalone
1132	>	(void)pthread_detach(exc_thread);
1133	>
1134		sigsegv_fault_handler = handler;
1135	+	return true;
1136	+	#else
1137	+	return false;
1138	+	#endif
1139	+	}
1140	+	#endif
1141	+
1142	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1143	+	{
1144	+	#if defined(HAVE_SIGSEGV_RECOVERY)
1145		bool success = true;
1146		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1147		SIGSEGV_ALL_SIGNALS
1148		#undef FAULT_HANDLER
1149	+	if (success)
1150	+	sigsegv_fault_handler = handler;
1151		return success;
1152	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1153	+	return sigsegv_do_install_handler(handler);
1154		#else
1155		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1156		return false;
#	Line 680 \| Line 1164 \| bool sigsegv_install_handler(sigsegv_fau
1164
1165		void sigsegv_deinstall_handler(void)
1166		{
1167	+	// We do nothing for Mach exceptions, the thread would need to be
1168	+	// suspended if not already so, and we might mess with other
1169	+	// exception handlers that came after we registered ours. There is
1170	+	// no need to remove the exception handler, in fact this function is
1171	+	// not called anywhere in Basilisk II.
1172		#ifdef HAVE_SIGSEGV_RECOVERY
1173		sigsegv_fault_handler = 0;
1174		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
#	Line 690 \| Line 1179 \| void sigsegv_deinstall_handler(void)
1179
1180
1181		/*
693	–	* SIGSEGV ignore state modifier
694	–	*/
695	–
696	–	void sigsegv_set_ignore_state(bool ignore_fault)
697	–	{
698	–	sigsegv_ignore_fault = ignore_fault;
699	–	}
700	–
701	–
702	–	/*
1182		* Set callback function when we cannot handle the fault
1183		*/
1184
#	Line 720 \| Line 1199 \| void sigsegv_set_dump_state(sigsegv_stat
1199		#include <sys/mman.h>
1200		#include "vm_alloc.h"
1201
1202	+	const int REF_INDEX = 123;
1203	+	const int REF_VALUE = 45;
1204	+
1205		static int page_size;
1206		static volatile char * page = 0;
1207		static volatile int handler_called = 0;
1208
1209	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1209	>	#ifdef __GNUC__
1210	>	// Code range where we expect the fault to come from
1211	>	static void b_region, e_region;
1212	>	#endif
1213	>
1214	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1215		{
1216		handler_called++;
1217	<	if ((fault_address - 123) != page)
1218	<	exit(1);
1217	>	if ((fault_address - REF_INDEX) != page)
1218	>	exit(10);
1219	>	#ifdef __GNUC__
1220	>	// Make sure reported fault instruction address falls into
1221	>	// expected code range
1222	>	if (instruction_address != SIGSEGV_INVALID_PC
1223	>	&& ((instruction_address < (sigsegv_address_t)b_region) \|\|
1224	>	(instruction_address >= (sigsegv_address_t)e_region)))
1225	>	exit(11);
1226	>	#endif
1227		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ \| VM_PAGE_WRITE) != 0)
1228	<	exit(1);
1229	<	return true;
1228	>	exit(12);
1229	>	return SIGSEGV_RETURN_SUCCESS;
1230		}
1231
1232		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1233	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1233	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1234		{
1235	<	return false;
1235	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1236	>	#ifdef __GNUC__
1237	>	// Make sure reported fault instruction address falls into
1238	>	// expected code range
1239	>	if (instruction_address != SIGSEGV_INVALID_PC
1240	>	&& ((instruction_address < (sigsegv_address_t)b_region) \|\|
1241	>	(instruction_address >= (sigsegv_address_t)e_region)))
1242	>	return SIGSEGV_RETURN_FAILURE;
1243	>	#endif
1244	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1245	>	}
1246	>
1247	>	return SIGSEGV_RETURN_FAILURE;
1248		}
1249		#endif
1250
#	Line 748 \| Line 1255 \| int main(void)
1255
1256		page_size = getpagesize();
1257		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1258	<	return 1;
1258	>	return 2;
1259
1260	+	memset((void *)page, 0, page_size);
1261		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1262	<	return 1;
1262	>	return 3;
1263
1264		if (!sigsegv_install_handler(sigsegv_test_handler))
1265	<	return 1;
758	<
759	<	page[123] = 45;
760	<	page[123] = 45;
1265	>	return 4;
1266
1267	+	#ifdef __GNUC__
1268	+	b_region = &&L_b_region1;
1269	+	e_region = &&L_e_region1;
1270	+	#endif
1271	+	L_b_region1:
1272	+	page[REF_INDEX] = REF_VALUE;
1273	+	if (page[REF_INDEX] != REF_VALUE)
1274	+	exit(20);
1275	+	page[REF_INDEX] = REF_VALUE;
1276	+	L_e_region1:
1277	+
1278		if (handler_called != 1)
1279	<	return 1;
1279	>	return 5;
1280
1281		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1282		if (!sigsegv_install_handler(sigsegv_insn_handler))
1283	<	return 1;
1283	>	return 6;
1284
1285	<	if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0)
1286	<	return 1;
1285	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ \| VM_PAGE_WRITE) < 0)
1286	>	return 7;
1287
1288		for (int i = 0; i < page_size; i++)
1289		page[i] = (i + 1) % page_size;
1290
1291		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1292	<	return 1;
1292	>	return 8;
1293
778	–	sigsegv_set_ignore_state(true);
779	–
1294		#define TEST_SKIP_INSTRUCTION(TYPE) do { \
1295		const unsigned int TAG = 0x12345678; \
1296		TYPE data = ((TYPE )(page + sizeof(TYPE))); \
1297		volatile unsigned int effect = data + TAG; \
1298		if (effect != TAG) \
1299	<	return 1; \
1299	>	return 9; \
1300		} while (0)
1301
1302	+	#ifdef __GNUC__
1303	+	b_region = &&L_b_region2;
1304	+	e_region = &&L_e_region2;
1305	+	#endif
1306	+	L_b_region2:
1307		TEST_SKIP_INSTRUCTION(unsigned char);
1308		TEST_SKIP_INSTRUCTION(unsigned short);
1309		TEST_SKIP_INSTRUCTION(unsigned int);
1310	+	L_e_region2:
1311		#endif
1312
1313		vm_exit();
1314		return 0;
1315		}
1316		#endif
1317	+
1318	+
1319	+
1320	+
1321	+
1322	+
1323	+
1324	+
1325	+
1326	+
1327	+
1328	+
1329	+
1330	+
1331	+

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Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents): Revision 1.15 by gbeauche, 2002-05-20T16:00:07Z vs. Revision 1.32 by gbeauche, 2003-10-21T21:59:41Z

Diff Legend

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.15 by gbeauche, 2002-05-20T16:00:07Z vs.
Revision 1.32 by gbeauche, 2003-10-21T21:59:41Z