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root/cebix/BasiliskII/src/Unix/sigsegv.cpp

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.18 by gbeauche, 2002-05-20T18:12:01Z vs.
Revision 1.31 by gbeauche, 2003-10-13T20:15:41Z

#	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(__NetBSD__) || defined(__FreeBSD__)
225		#if (defined(i386) || defined(__i386__))
226		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
227		#define SIGSEGV_REGISTER_FILE                   ((unsigned int *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
221	–	/* (gb) Disable because this would hang configure script for some reason
222	–	* though standalone testing gets it right. Any idea why?
228		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
229	<	*/
229	>	#endif
230		#endif
231		#if defined(__linux__)
232		#if (defined(i386) || defined(__i386__))
#	Line 231 | Line 236 | static void powerpc_decode_instruction(i
236		#define SIGSEGV_REGISTER_FILE                   (unsigned int *)SIGSEGV_CONTEXT_REGS
237		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
238		#endif
239	+	#if (defined(x86_64) || defined(__x86_64__))
240	+	#include <sys/ucontext.h>
241	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
242	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
243	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
244	+	#endif
245		#if (defined(ia64) || defined(__ia64__))
246		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
247		#endif
#	Line 251 | Line 262 | static void powerpc_decode_instruction(i
262		#if (defined(i386) || defined(__i386__))
263		#include <asm/sigcontext.h>
264		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
265	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
266	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
267	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)(&scs)
265	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
266	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
267	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
268	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
269	>	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)scp
270		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
271		#endif
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)
#	Line 272 | Line 287 | static void powerpc_decode_instruction(i
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
#	Line 290 | Line 306 | static sigsegv_address_t get_fault_addre
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
#	Line 297 | Line 314 | static sigsegv_address_t get_fault_addre
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
#	Line 305 | Line 323 | static sigsegv_address_t get_fault_addre
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
#	Line 312 | Line 331 | static sigsegv_address_t get_fault_addre
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
#	Line 321 | Line 341 | static sigsegv_address_t get_fault_addre
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
#	Line 346 | Line 367 | static sigsegv_address_t get_fault_addre
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)
#	Line 374 | Line 404 | static sigsegv_address_t get_fault_addre
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_INVOKE(ADDR, IP)  ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
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		/*
#	Line 450 | Line 616 | static bool ix86_skip_instruction(unsign
616		if (eip == 0)
617		return false;
618
619	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
619	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
620		transfer_size_t transfer_size = SIZE_LONG;
621
622		int reg = -1;
#	Line 472 | Line 638 | static bool ix86_skip_instruction(unsign
638		switch (eip[2] & 0xc0) {
639		case 0x80:
640		reg = (eip[2] >> 3) & 7;
641	<	transfer_type = TYPE_LOAD;
641	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
642		break;
643		case 0x40:
644		reg = (eip[2] >> 3) & 7;
645	<	transfer_type = TYPE_LOAD;
645	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
646		break;
647		case 0x00:
648		reg = (eip[2] >> 3) & 7;
649	<	transfer_type = TYPE_LOAD;
649	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
650		break;
651		}
652		len += 3 + ix86_step_over_modrm(eip + 2);
#	Line 493 | Line 659 | static bool ix86_skip_instruction(unsign
659		switch (eip[1] & 0xc0) {
660		case 0x80:
661		reg = (eip[1] >> 3) & 7;
662	<	transfer_type = TYPE_LOAD;
662	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
663		break;
664		case 0x40:
665		reg = (eip[1] >> 3) & 7;
666	<	transfer_type = TYPE_LOAD;
666	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
667		break;
668		case 0x00:
669		reg = (eip[1] >> 3) & 7;
670	<	transfer_type = TYPE_LOAD;
670	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
671		break;
672		}
673		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 512 | Line 678 | static bool ix86_skip_instruction(unsign
678		switch (eip[1] & 0xc0) {
679		case 0x80:
680		reg = (eip[1] >> 3) & 7;
681	<	transfer_type = TYPE_STORE;
681	>	transfer_type = SIGSEGV_TRANSFER_STORE;
682		break;
683		case 0x40:
684		reg = (eip[1] >> 3) & 7;
685	<	transfer_type = TYPE_STORE;
685	>	transfer_type = SIGSEGV_TRANSFER_STORE;
686		break;
687		case 0x00:
688		reg = (eip[1] >> 3) & 7;
689	<	transfer_type = TYPE_STORE;
689	>	transfer_type = SIGSEGV_TRANSFER_STORE;
690		break;
691		}
692		len += 2 + ix86_step_over_modrm(eip + 1);
693		break;
694		}
695
696	<	if (transfer_type == TYPE_UNKNOWN) {
696	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
697		// Unknown machine code, let it crash. Then patch the decoder
698		return false;
699		}
700
701	<	if (transfer_type == TYPE_LOAD && reg != -1) {
701	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
702		static const int x86_reg_map[8] = {
703		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
704		X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
#	Line 558 | Line 724 | static bool ix86_skip_instruction(unsign
724		#if DEBUG
725		printf("%08x: %s %s access", regs[X86_REG_EIP],
726		transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
727	<	transfer_type == TYPE_LOAD ? "read" : "write");
727	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
728
729		if (reg != -1) {
730		static const char * x86_reg_str_map[8] = {
731		"eax", "ecx", "edx", "ebx",
732		"esp", "ebp", "esi", "edi"
733		};
734	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
734	>	printf(" %s register %%%s", transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from", x86_reg_str_map[reg]);
735		}
736		printf(", %d bytes instruction\n", len);
737		#endif
#	Line 582 | Line 748 | static bool powerpc_skip_instruction(uns
748		instruction_t instr;
749		powerpc_decode_instruction(&instr, *nip_p, regs);
750
751	<	if (instr.transfer_type == TYPE_UNKNOWN) {
751	>	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
752		// Unknown machine code, let it crash. Then patch the decoder
753		return false;
754		}
#	Line 590 | Line 756 | static bool powerpc_skip_instruction(uns
756		#if DEBUG
757		printf("%08x: %s %s access", *nip_p,
758		instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
759	<	instr.transfer_type == TYPE_LOAD ? "read" : "write");
759	>	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
760
761		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
762		printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
763	<	if (instr.transfer_type == TYPE_LOAD)
763	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
764		printf(" r%d (rd = 0)\n", instr.rd);
765		#endif
766
767		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
768		regs[instr.ra] = instr.addr;
769	<	if (instr.transfer_type == TYPE_LOAD)
769	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
770		regs[instr.rd] = 0;
771
772		*nip_p += 4;
#	Line 613 | Line 779 | static bool powerpc_skip_instruction(uns
779		#ifndef SIGSEGV_FAULT_INSTRUCTION
780		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
781		#endif
782	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
783	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
784	+	#endif
785	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
786	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
787	+	#endif
788
789		// SIGSEGV recovery supported ?
790		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 624 | Line 796 | static bool powerpc_skip_instruction(uns
796		*  SIGSEGV global handler
797		*/
798
799	<	#ifdef HAVE_SIGSEGV_RECOVERY
800	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
799	>	#if defined(HAVE_SIGSEGV_RECOVERY) || defined(HAVE_MACH_EXCEPTIONS)
800	>	// This function handles the badaccess to memory.
801	>	// It is called from the signal handler or the exception handler.
802	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
803		{
804		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
805		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
632	–	bool fault_recovered = false;
806
807		// Call user's handler and reinstall the global handler, if required
808	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
809	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
810	<	sigsegv_do_install_handler(sig);
808	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
809	>	case SIGSEGV_RETURN_SUCCESS:
810	>	return true;
811	>
812	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
813	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
814	>	// Call the instruction skipper with the register file
815	>	// available
816	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
817	>	#ifdef HAVE_MACH_EXCEPTIONS
818	>	// Unlike UNIX signals where the thread state
819	>	// is modified off of the stack, in Mach we
820	>	// need to actually call thread_set_state to
821	>	// have the register values updated.
822	>	kern_return_t krc;
823	>
824	>	krc = thread_set_state(thread,
825	>	MACHINE_THREAD_STATE, (thread_state_t)state,
826	>	MACHINE_THREAD_STATE_COUNT);
827	>	MACH_CHECK_ERROR (thread_get_state, krc);
828	>	#endif
829	>	return true;
830	>	}
831	>	break;
832		#endif
639	–	fault_recovered = true;
833		}
834	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
835	<	else if (sigsegv_ignore_fault) {
836	<	// Call the instruction skipper with the register file available
837	<	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
838	<	fault_recovered = true;
834	>
835	>	// We can't do anything with the fault_address, dump state?
836	>	if (sigsegv_state_dumper != 0)
837	>	sigsegv_state_dumper(fault_address, fault_instruction);
838	>
839	>	return false;
840	>	}
841	>	#endif
842	>
843	>
844	>	/*
845	>	* There are two mechanisms for handling a bad memory access,
846	>	* Mach exceptions and UNIX signals. The implementation specific
847	>	* code appears below. Its reponsibility is to call handle_badaccess
848	>	* which is the routine that handles the fault in an implementation
849	>	* agnostic manner. The implementation specific code below is then
850	>	* reponsible for checking whether handle_badaccess was able
851	>	* to handle the memory access error and perform any implementation
852	>	* specific tasks necessary afterwards.
853	>	*/
854	>
855	>	#ifdef HAVE_MACH_EXCEPTIONS
856	>	/*
857	>	* We need to forward all exceptions that we do not handle.
858	>	* This is important, there are many exceptions that may be
859	>	* handled by other exception handlers. For example debuggers
860	>	* use exceptions and the exception hander is in another
861	>	* process in such a case. (Timothy J. Wood states in his
862	>	* message to the list that he based this code on that from
863	>	* gdb for Darwin.)
864	>	*/
865	>	static inline kern_return_t
866	>	forward_exception(mach_port_t thread_port,
867	>	mach_port_t task_port,
868	>	exception_type_t exception_type,
869	>	exception_data_t exception_data,
870	>	mach_msg_type_number_t data_count,
871	>	ExceptionPorts *oldExceptionPorts)
872	>	{
873	>	kern_return_t kret;
874	>	unsigned int portIndex;
875	>	mach_port_t port;
876	>	exception_behavior_t behavior;
877	>	thread_state_flavor_t flavor;
878	>	thread_state_t thread_state;
879	>	mach_msg_type_number_t thread_state_count;
880	>
881	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
882	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
883	>	// This handler wants the exception
884	>	break;
885	>	}
886	>	}
887	>
888	>	if (portIndex >= oldExceptionPorts->maskCount) {
889	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
890	>	return KERN_FAILURE;
891	>	}
892	>
893	>	port = oldExceptionPorts->handlers[portIndex];
894	>	behavior = oldExceptionPorts->behaviors[portIndex];
895	>	flavor = oldExceptionPorts->flavors[portIndex];
896	>
897	>	/*
898	>	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
899	>	*/
900	>
901	>	if (behavior != EXCEPTION_DEFAULT) {
902	>	thread_state_count = THREAD_STATE_MAX;
903	>	kret = thread_get_state (thread_port, flavor, thread_state,
904	>	&thread_state_count);
905	>	MACH_CHECK_ERROR (thread_get_state, kret);
906	>	}
907	>
908	>	switch (behavior) {
909	>	case EXCEPTION_DEFAULT:
910	>	// fprintf(stderr, "forwarding to exception_raise\n");
911	>	kret = exception_raise(port, thread_port, task_port, exception_type,
912	>	exception_data, data_count);
913	>	MACH_CHECK_ERROR (exception_raise, kret);
914	>	break;
915	>	case EXCEPTION_STATE:
916	>	// fprintf(stderr, "forwarding to exception_raise_state\n");
917	>	kret = exception_raise_state(port, exception_type, exception_data,
918	>	data_count, &flavor,
919	>	thread_state, thread_state_count,
920	>	thread_state, &thread_state_count);
921	>	MACH_CHECK_ERROR (exception_raise_state, kret);
922	>	break;
923	>	case EXCEPTION_STATE_IDENTITY:
924	>	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
925	>	kret = exception_raise_state_identity(port, thread_port, task_port,
926	>	exception_type, exception_data,
927	>	data_count, &flavor,
928	>	thread_state, thread_state_count,
929	>	thread_state, &thread_state_count);
930	>	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
931	>	break;
932	>	default:
933	>	fprintf(stderr, "forward_exception got unknown behavior\n");
934	>	break;
935		}
936	+
937	+	if (behavior != EXCEPTION_DEFAULT) {
938	+	kret = thread_set_state (thread_port, flavor, thread_state,
939	+	thread_state_count);
940	+	MACH_CHECK_ERROR (thread_set_state, kret);
941	+	}
942	+
943	+	return KERN_SUCCESS;
944	+	}
945	+
946	+	/*
947	+	* This is the code that actually handles the exception.
948	+	* It is called by exc_server. For Darwin 5 Apple changed
949	+	* this a bit from how this family of functions worked in
950	+	* Mach. If you are familiar with that it is a little
951	+	* different. The main variation that concerns us here is
952	+	* that code is an array of exception specific codes and
953	+	* codeCount is a count of the number of codes in the code
954	+	* array. In typical Mach all exceptions have a code
955	+	* and sub-code. It happens to be the case that for a
956	+	* EXC_BAD_ACCESS exception the first entry is the type of
957	+	* bad access that occurred and the second entry is the
958	+	* faulting address so these entries correspond exactly to
959	+	* how the code and sub-code are used on Mach.
960	+	*
961	+	* This is a MIG interface. No code in Basilisk II should
962	+	* call this directley. This has to have external C
963	+	* linkage because that is what exc_server expects.
964	+	*/
965	+	kern_return_t
966	+	catch_exception_raise(mach_port_t exception_port,
967	+	mach_port_t thread,
968	+	mach_port_t task,
969	+	exception_type_t exception,
970	+	exception_data_t code,
971	+	mach_msg_type_number_t codeCount)
972	+	{
973	+	ppc_thread_state_t state;
974	+	kern_return_t krc;
975	+
976	+	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
977	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
978	+	return KERN_SUCCESS;
979	+	}
980	+
981	+	// In Mach we do not need to remove the exception handler.
982	+	// If we forward the exception, eventually some exception handler
983	+	// will take care of this exception.
984	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
985	+
986	+	return krc;
987	+	}
988	+	#endif
989	+
990	+	#ifdef HAVE_SIGSEGV_RECOVERY
991	+	// Handle bad memory accesses with signal handler
992	+	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
993	+	{
994	+	// Call handler and reinstall the global handler, if required
995	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
996	+	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
997	+	sigsegv_do_install_handler(sig);
998		#endif
999	+	return;
1000	+	}
1001
1002	<	if (!fault_recovered) {
650	<	// FAIL: reinstall default handler for "safe" crash
1002	>	// Failure: reinstall default handler for "safe" crash
1003		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1004	<	SIGSEGV_ALL_SIGNALS
1004	>	SIGSEGV_ALL_SIGNALS
1005		#undef FAULT_HANDLER
654	–
655	–	// We can't do anything with the fault_address, dump state?
656	–	if (sigsegv_state_dumper != 0)
657	–	sigsegv_state_dumper(fault_address, fault_instruction);
658	–	}
1006		}
1007		#endif
1008
#	Line 669 | Line 1016 | static bool sigsegv_do_install_handler(i
1016		{
1017		// Setup SIGSEGV handler to process writes to frame buffer
1018		#ifdef HAVE_SIGACTION
1019	<	struct sigaction vosf_sa;
1020	<	sigemptyset(&vosf_sa.sa_mask);
1021	<	vosf_sa.sa_sigaction = sigsegv_handler;
1022	<	vosf_sa.sa_flags = SA_SIGINFO;
1023	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1019	>	struct sigaction sigsegv_sa;
1020	>	sigemptyset(&sigsegv_sa.sa_mask);
1021	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1022	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1023	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1024		#else
1025		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1026		#endif
#	Line 685 | Line 1032 | static bool sigsegv_do_install_handler(i
1032		{
1033		// Setup SIGSEGV handler to process writes to frame buffer
1034		#ifdef HAVE_SIGACTION
1035	<	struct sigaction vosf_sa;
1036	<	sigemptyset(&vosf_sa.sa_mask);
1037	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1035	>	struct sigaction sigsegv_sa;
1036	>	sigemptyset(&sigsegv_sa.sa_mask);
1037	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1038	>	sigsegv_sa.sa_flags = 0;
1039		#if !EMULATED_68K && defined(__NetBSD__)
1040	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1041	<	vosf_sa.sa_flags = SA_ONSTACK;
694	<	#else
695	<	vosf_sa.sa_flags = 0;
1040	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1041	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1042		#endif
1043	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1043	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1044		#else
1045		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1046		#endif
1047		}
1048		#endif
1049
1050	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1050	>	#if defined(HAVE_MACH_EXCEPTIONS)
1051	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1052		{
1053	<	#ifdef HAVE_SIGSEGV_RECOVERY
1053	>	/*
1054	>	* Except for the exception port functions, this should be
1055	>	* pretty much stock Mach. If later you choose to support
1056	>	* other Mach's besides Darwin, just check for __MACH__
1057	>	* here and __APPLE__ where the actual differences are.
1058	>	*/
1059	>	#if defined(__APPLE__) && defined(__MACH__)
1060	>	if (sigsegv_fault_handler != NULL) {
1061	>	sigsegv_fault_handler = handler;
1062	>	return true;
1063	>	}
1064	>
1065	>	kern_return_t krc;
1066	>
1067	>	// create the the exception port
1068	>	krc = mach_port_allocate(mach_task_self(),
1069	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1070	>	if (krc != KERN_SUCCESS) {
1071	>	mach_error("mach_port_allocate", krc);
1072	>	return false;
1073	>	}
1074	>
1075	>	// add a port send right
1076	>	krc = mach_port_insert_right(mach_task_self(),
1077	>	_exceptionPort, _exceptionPort,
1078	>	MACH_MSG_TYPE_MAKE_SEND);
1079	>	if (krc != KERN_SUCCESS) {
1080	>	mach_error("mach_port_insert_right", krc);
1081	>	return false;
1082	>	}
1083	>
1084	>	// get the old exception ports
1085	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1086	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1087	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1088	>	if (krc != KERN_SUCCESS) {
1089	>	mach_error("thread_get_exception_ports", krc);
1090	>	return false;
1091	>	}
1092	>
1093	>	// set the new exception port
1094	>	//
1095	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1096	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1097	>	// message, but it turns out that in the common case this is not
1098	>	// neccessary. If we need it we can later ask for it from the
1099	>	// suspended thread.
1100	>	//
1101	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1102	>	// counter in the thread state.  The comments in the header file
1103	>	// seem to imply that you can count on the GPR's on an exception
1104	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1105	>	// you have to ask for all of the GPR's anyway just to get the
1106	>	// program counter. In any case because of update effective
1107	>	// address from immediate and update address from effective
1108	>	// addresses of ra and rb modes (as good an name as any for these
1109	>	// addressing modes) used in PPC instructions, you will need the
1110	>	// GPR state anyway.
1111	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1112	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1113	>	if (krc != KERN_SUCCESS) {
1114	>	mach_error("thread_set_exception_ports", krc);
1115	>	return false;
1116	>	}
1117	>
1118	>	// create the exception handler thread
1119	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1120	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1121	>	return false;
1122	>	}
1123	>
1124	>	// do not care about the exception thread any longer, let is run standalone
1125	>	(void)pthread_detach(exc_thread);
1126	>
1127		sigsegv_fault_handler = handler;
1128	+	return true;
1129	+	#else
1130	+	return false;
1131	+	#endif
1132	+	}
1133	+	#endif
1134	+
1135	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1136	+	{
1137	+	#if defined(HAVE_SIGSEGV_RECOVERY)
1138		bool success = true;
1139		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1140		SIGSEGV_ALL_SIGNALS
1141		#undef FAULT_HANDLER
1142	+	if (success)
1143	+	sigsegv_fault_handler = handler;
1144		return success;
1145	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1146	+	return sigsegv_do_install_handler(handler);
1147		#else
1148		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1149		return false;
#	Line 723 | Line 1157 | bool sigsegv_install_handler(sigsegv_fau
1157
1158		void sigsegv_deinstall_handler(void)
1159		{
1160	+	// We do nothing for Mach exceptions, the thread would need to be
1161	+	// suspended if not already so, and we might mess with other
1162	+	// exception handlers that came after we registered ours. There is
1163	+	// no need to remove the exception handler, in fact this function is
1164	+	// not called anywhere in Basilisk II.
1165		#ifdef HAVE_SIGSEGV_RECOVERY
1166		sigsegv_fault_handler = 0;
1167		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
#	Line 733 | Line 1172 | void sigsegv_deinstall_handler(void)
1172
1173
1174		/*
736	–	*  SIGSEGV ignore state modifier
737	–	*/
738	–
739	–	void sigsegv_set_ignore_state(bool ignore_fault)
740	–	{
741	–	sigsegv_ignore_fault = ignore_fault;
742	–	}
743	–
744	–
745	–	/*
1175		*  Set callback function when we cannot handle the fault
1176		*/
1177
#	Line 767 | Line 1196 | static int page_size;
1196		static volatile char * page = 0;
1197		static volatile int handler_called = 0;
1198
1199	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1199	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1200		{
1201		handler_called++;
1202		if ((fault_address - 123) != page)
1203	<	exit(1);
1203	>	exit(10);
1204		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
1205	<	exit(1);
1206	<	return true;
1205	>	exit(11);
1206	>	return SIGSEGV_RETURN_SUCCESS;
1207		}
1208
1209		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1210	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1210	>	#ifdef __GNUC__
1211	>	// Code range where we expect the fault to come from
1212	>	static void *b_region, *e_region;
1213	>	#endif
1214	>
1215	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1216		{
1217	<	return false;
1217	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1218	>	#ifdef __GNUC__
1219	>	// Make sure reported fault instruction address falls into
1220	>	// expected code range
1221	>	if (instruction_address != SIGSEGV_INVALID_PC
1222	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1223	>	(instruction_address >= (sigsegv_address_t)e_region)))
1224	>	return SIGSEGV_RETURN_FAILURE;
1225	>	#endif
1226	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1227	>	}
1228	>
1229	>	return SIGSEGV_RETURN_FAILURE;
1230		}
1231		#endif
1232
#	Line 791 | Line 1237 | int main(void)
1237
1238		page_size = getpagesize();
1239		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1240	<	return 1;
1240	>	return 2;
1241
1242		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1243	<	return 1;
1243	>	return 3;
1244
1245		if (!sigsegv_install_handler(sigsegv_test_handler))
1246	<	return 1;
1246	>	return 4;
1247
1248		page[123] = 45;
1249		page[123] = 45;
1250
1251		if (handler_called != 1)
1252	<	return 1;
1252	>	return 5;
1253
1254		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1255		if (!sigsegv_install_handler(sigsegv_insn_handler))
1256	<	return 1;
1256	>	return 6;
1257
1258		if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
1259	<	return 1;
1259	>	return 7;
1260
1261		for (int i = 0; i < page_size; i++)
1262		page[i] = (i + 1) % page_size;
1263
1264		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1265	<	return 1;
1265	>	return 8;
1266
821	–	sigsegv_set_ignore_state(true);
822	–
1267		#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
1268		const unsigned int TAG = 0x12345678;                    \
1269		TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
1270		volatile unsigned int effect = data + TAG;              \
1271		if (effect != TAG)                                                              \
1272	<	return 1;                                                                       \
1272	>	return 9;                                                                       \
1273		} while (0)
1274
1275	+	#ifdef __GNUC__
1276	+	b_region = &&L_b_region;
1277	+	e_region = &&L_e_region;
1278	+	#endif
1279	+	L_b_region:
1280		TEST_SKIP_INSTRUCTION(unsigned char);
1281		TEST_SKIP_INSTRUCTION(unsigned short);
1282		TEST_SKIP_INSTRUCTION(unsigned int);
1283	+	L_e_region:
1284		#endif
1285
1286		vm_exit();

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