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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.16 by gbeauche, 2002-05-20T16:03:37Z vs.
Revision 1.79 by gbeauche, 2008-01-12T23:01:40Z

#	Line 4 | Line 4
4		*  Derived from Bruno Haible's work on his SIGSEGV library for clisp
5		*  <http://clisp.sourceforge.net/>
6		*
7	<	*  Basilisk II (C) 1997-2002 Christian Bauer
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) 1997-2008 Christian Bauer
14		*
15		*  This program is free software; you can redistribute it and/or modify
16		*  it under the terms of the GNU General Public License as published by
#	Line 29 | Line 35
35		#include "config.h"
36		#endif
37
38	+	#include <list>
39	+	#include <stdio.h>
40		#include <signal.h>
41		#include "sigsegv.h"
42
43	+	#ifndef NO_STD_NAMESPACE
44	+	using std::list;
45	+	#endif
46	+
47		// Return value type of a signal handler (standard type if not defined)
48		#ifndef RETSIGTYPE
49		#define RETSIGTYPE void
50		#endif
51
52	+	// Size of an unsigned integer large enough to hold all bits of a pointer
53	+	// NOTE: this can be different than SIGSEGV_REGISTER_TYPE. In
54	+	// particular, on ILP32 systems with a 64-bit kernel (HP-UX/ia64?)
55	+	#ifdef HAVE_WIN32_VM
56	+	// Windows is either ILP32 or LLP64
57	+	typedef UINT_PTR sigsegv_uintptr_t;
58	+	#else
59	+	// Other systems are sane enough to follow ILP32 or LP64 models
60	+	typedef unsigned long sigsegv_uintptr_t;
61	+	#endif
62	+
63		// Type of the system signal handler
64		typedef RETSIGTYPE (*signal_handler)(int);
65
43	–	// Is the fault to be ignored?
44	–	static bool sigsegv_ignore_fault = false;
45	–
66		// User's SIGSEGV handler
67		static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
68
#	Line 59 | Line 79 | static bool sigsegv_do_install_handler(i
79
80		// Transfer type
81		enum transfer_type_t {
82	<	TYPE_UNKNOWN,
83	<	TYPE_LOAD,
84	<	TYPE_STORE
82	>	SIGSEGV_TRANSFER_UNKNOWN        = 0,
83	>	SIGSEGV_TRANSFER_LOAD           = 1,
84	>	SIGSEGV_TRANSFER_STORE          = 2
85		};
86
87		// Transfer size
88		enum transfer_size_t {
89		SIZE_UNKNOWN,
90		SIZE_BYTE,
91	<	SIZE_WORD,
92	<	SIZE_LONG
91	>	SIZE_WORD, // 2 bytes
92	>	SIZE_LONG, // 4 bytes
93	>	SIZE_QUAD  // 8 bytes
94		};
95
96	<	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
96	>	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__) || defined(__ppc64__))
97		// Addressing mode
98		enum addressing_mode_t {
99		MODE_UNKNOWN,
#	Line 91 | Line 112 | struct instruction_t {
112		char                            ra, rd;
113		};
114
115	<	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned int * gpr)
115	>	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned long * gpr)
116		{
117		// Get opcode and divide into fields
118	<	unsigned int opcode = *((unsigned int *)nip);
118	>	unsigned int opcode = *((unsigned int *)(unsigned long)nip);
119		unsigned int primop = opcode >> 26;
120		unsigned int exop = (opcode >> 1) & 0x3ff;
121		unsigned int ra = (opcode >> 16) & 0x1f;
#	Line 103 | Line 124 | static void powerpc_decode_instruction(i
124		signed int imm = (signed short)(opcode & 0xffff);
125
126		// Analyze opcode
127	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
127	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
128		transfer_size_t transfer_size = SIZE_UNKNOWN;
129		addressing_mode_t addr_mode = MODE_UNKNOWN;
130		switch (primop) {
131		case 31:
132		switch (exop) {
133		case 23:        // lwzx
134	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
134	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
135		case 55:        // lwzux
136	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
136	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
137		case 87:        // lbzx
138	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
138	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
139		case 119:       // lbzux
140	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
140	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
141		case 151:       // stwx
142	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
142	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
143		case 183:       // stwux
144	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
144	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
145		case 215:       // stbx
146	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
146	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
147		case 247:       // stbux
148	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
148	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
149		case 279:       // lhzx
150	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
150	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
151		case 311:       // lhzux
152	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
152	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
153		case 343:       // lhax
154	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
154	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
155		case 375:       // lhaux
156	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
156	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
157		case 407:       // sthx
158	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
158	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
159		case 439:       // sthux
160	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
160	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
161		}
162		break;
163
164		case 32:        // lwz
165	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
165	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
166		case 33:        // lwzu
167	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
167	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
168		case 34:        // lbz
169	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
169	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
170		case 35:        // lbzu
171	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
171	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
172		case 36:        // stw
173	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
173	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
174		case 37:        // stwu
175	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
175	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
176		case 38:        // stb
177	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
177	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
178		case 39:        // stbu
179	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
179	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
180		case 40:        // lhz
181	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
181	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
182		case 41:        // lhzu
183	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
183	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
184		case 42:        // lha
185	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
185	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
186		case 43:        // lhau
187	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
187	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
188		case 44:        // sth
189	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
189	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
190		case 45:        // sthu
191	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
191	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
192	>	case 58:        // ld, ldu, lwa
193	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
194	>	transfer_size = SIZE_QUAD;
195	>	addr_mode = ((opcode & 3) == 1) ? MODE_U : MODE_NORM;
196	>	imm &= ~3;
197	>	break;
198	>	case 62:        // std, stdu, stq
199	>	transfer_type = SIGSEGV_TRANSFER_STORE;
200	>	transfer_size = SIZE_QUAD;
201	>	addr_mode = ((opcode & 3) == 1) ? MODE_U : MODE_NORM;
202	>	imm &= ~3;
203	>	break;
204		}
205
206		// Calculate effective address
#	Line 208 | Line 241 | static void powerpc_decode_instruction(i
241
242		#if HAVE_SIGINFO_T
243		// Generic extended signal handler
244	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
244	>	#if defined(__FreeBSD__)
245		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
246		#else
247		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
248		#endif
249		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
250	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t *sip, void *scp
251	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sip, scp
252		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
253	+	#if (defined(sgi) || defined(__sgi))
254	+	#include <ucontext.h>
255	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
256	+	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)SIGSEGV_CONTEXT_REGS[CTX_EPC]
257	+	#if (defined(mips) || defined(__mips))
258	+	#define SIGSEGV_REGISTER_FILE                   &SIGSEGV_CONTEXT_REGS[CTX_EPC], &SIGSEGV_CONTEXT_REGS[CTX_R0]
259	+	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
260	+	#endif
261	+	#endif
262	+	#if defined(__sun__)
263	+	#if (defined(sparc) || defined(__sparc__))
264	+	#include <sys/stack.h>
265	+	#include <sys/regset.h>
266	+	#include <sys/ucontext.h>
267	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
268	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[REG_PC]
269	+	#define SIGSEGV_SPARC_GWINDOWS                  (((ucontext_t *)scp)->uc_mcontext.gwins)
270	+	#define SIGSEGV_SPARC_RWINDOW                   (struct rwindow *)((char *)SIGSEGV_CONTEXT_REGS[REG_SP] + STACK_BIAS)
271	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)SIGSEGV_CONTEXT_REGS), SIGSEGV_SPARC_GWINDOWS, SIGSEGV_SPARC_RWINDOW
272	+	#define SIGSEGV_SKIP_INSTRUCTION                sparc_skip_instruction
273	+	#endif
274	+	#if defined(__i386__)
275	+	#include <sys/regset.h>
276	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
277	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[EIP]
278	+	#define SIGSEGV_REGISTER_FILE                   (SIGSEGV_REGISTER_TYPE *)SIGSEGV_CONTEXT_REGS
279	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
280	+	#endif
281	+	#endif
282	+	#if defined(__FreeBSD__) || defined(__OpenBSD__)
283	+	#if (defined(i386) || defined(__i386__))
284	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
285	+	#define SIGSEGV_REGISTER_FILE                   ((SIGSEGV_REGISTER_TYPE *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
286	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
287	+	#endif
288	+	#endif
289	+	#if defined(__NetBSD__)
290	+	#if (defined(i386) || defined(__i386__))
291	+	#include <sys/ucontext.h>
292	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.__gregs)
293	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[_REG_EIP]
294	+	#define SIGSEGV_REGISTER_FILE                   (SIGSEGV_REGISTER_TYPE *)SIGSEGV_CONTEXT_REGS
295	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
296	+	#endif
297	+	#if (defined(powerpc) || defined(__powerpc__))
298	+	#include <sys/ucontext.h>
299	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.__gregs)
300	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[_REG_PC]
301	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS[_REG_PC], (unsigned long *)&SIGSEGV_CONTEXT_REGS[_REG_R0]
302	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
303	+	#endif
304	+	#endif
305		#if defined(__linux__)
306		#if (defined(i386) || defined(__i386__))
307		#include <sys/ucontext.h>
308		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
309		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
310	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)SIGSEGV_CONTEXT_REGS
310	>	#define SIGSEGV_REGISTER_FILE                   (SIGSEGV_REGISTER_TYPE *)SIGSEGV_CONTEXT_REGS
311	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
312	>	#endif
313	>	#if (defined(x86_64) || defined(__x86_64__))
314	>	#include <sys/ucontext.h>
315	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
316	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
317	>	#define SIGSEGV_REGISTER_FILE                   (SIGSEGV_REGISTER_TYPE *)SIGSEGV_CONTEXT_REGS
318		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
319		#endif
320		#if (defined(ia64) || defined(__ia64__))
321	<	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
321	>	#define SIGSEGV_CONTEXT_REGS                    ((struct sigcontext *)scp)
322	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
323	>	#define SIGSEGV_REGISTER_FILE                   SIGSEGV_CONTEXT_REGS
324	>	#define SIGSEGV_SKIP_INSTRUCTION                ia64_skip_instruction
325		#endif
326		#if (defined(powerpc) || defined(__powerpc__))
327		#include <sys/ucontext.h>
328		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
329		#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
330	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
330	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned long *)(SIGSEGV_CONTEXT_REGS->gpr)
331		#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
332		#endif
333	+	#if (defined(hppa) || defined(__hppa__))
334	+	#undef  SIGSEGV_FAULT_ADDRESS
335	+	#define SIGSEGV_FAULT_ADDRESS                   sip->si_ptr
336	+	#endif
337	+	#if (defined(arm) || defined(__arm__))
338	+	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
339	+	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
340	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.arm_pc)
341	+	#define SIGSEGV_REGISTER_FILE                   (&SIGSEGV_CONTEXT_REGS.arm_r0)
342	+	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
343	+	#endif
344	+	#if (defined(mips) || defined(__mips__))
345	+	#include <sys/ucontext.h>
346	+	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
347	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.pc)
348	+	#define SIGSEGV_REGISTER_FILE                   &SIGSEGV_CONTEXT_REGS.pc, &SIGSEGV_CONTEXT_REGS.gregs[0]
349	+	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
350	+	#endif
351		#endif
352		#endif
353
#	Line 243 | Line 358 | static void powerpc_decode_instruction(i
358		#if (defined(i386) || defined(__i386__))
359		#include <asm/sigcontext.h>
360		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
361	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
362	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
363	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)(&scs)
361	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
362	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
363	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
364	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
365	>	#define SIGSEGV_REGISTER_FILE                   (SIGSEGV_REGISTER_TYPE *)scp
366		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
367		#endif
368		#if (defined(sparc) || defined(__sparc__))
369		#include <asm/sigcontext.h>
370		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
371	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
372		#define SIGSEGV_FAULT_ADDRESS                   addr
373		#endif
374		#if (defined(powerpc) || defined(__powerpc__))
375		#include <asm/sigcontext.h>
376		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
377	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
378		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
379		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
380	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
380	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&scp->regs->nip, (unsigned long *)(scp->regs->gpr)
381		#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
382		#endif
383		#if (defined(alpha) || defined(__alpha__))
384		#include <asm/sigcontext.h>
385		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
386	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
387		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
388		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
389	<
390	<	// From Boehm's GC 6.0alpha8
391	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
392	<	{
393	<	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
394	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
395	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
396	<	return (sigsegv_address_t)fault_address;
397	<	}
389	>	#endif
390	>	#if (defined(arm) || defined(__arm__))
391	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int r1, int r2, int r3, struct sigcontext sc
392	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
393	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &sc
394	>	#define SIGSEGV_FAULT_ADDRESS                   scp->fault_address
395	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->arm_pc
396	>	#define SIGSEGV_REGISTER_FILE                   &scp->arm_r0
397	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
398		#endif
399		#endif
400
401		// Irix 5 or 6 on MIPS
402	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
402	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
403		#include <ucontext.h>
404		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
405	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
405	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
406	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
407	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
408		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
409		#endif
410
411		// HP-UX
412		#if (defined(hpux) || defined(__hpux__))
413		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
414	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
415		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
416		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
417		#endif
#	Line 297 | Line 420 | static sigsegv_address_t get_fault_addre
420		#if defined(__osf__)
421		#include <ucontext.h>
422		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
423	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
424		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
425		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
426		#endif
#	Line 304 | Line 428 | static sigsegv_address_t get_fault_addre
428		// AIX
429		#if defined(_AIX)
430		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
431	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
432		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
433		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
434		#endif
435
436	<	// NetBSD or FreeBSD
437	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
436	>	// NetBSD
437	>	#if defined(__NetBSD__)
438		#if (defined(m68k) || defined(__m68k__))
439		#include <m68k/frame.h>
440		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
441	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
442		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
443		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
444
#	Line 336 | Line 462 | static sigsegv_address_t get_fault_addre
462		}
463		return (sigsegv_address_t)fault_addr;
464		}
465	<	#else
466	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
467	<	#define SIGSEGV_FAULT_ADDRESS                   addr
465	>	#endif
466	>	#if (defined(alpha) || defined(__alpha__))
467	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
468	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
469	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
470	>	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
471	>	#endif
472	>	#if (defined(i386) || defined(__i386__))
473	>	#error "FIXME: need to decode instruction and compute EA"
474	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
475	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
476	>	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
477	>	#endif
478	>	#endif
479	>	#if defined(__FreeBSD__)
480	>	#if (defined(i386) || defined(__i386__))
481		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
482	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
483	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
484	+	#define SIGSEGV_FAULT_ADDRESS                   addr
485	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
486	+	#define SIGSEGV_REGISTER_FILE                   ((SIGSEGV_REGISTER_TYPE *)&scp->sc_edi)
487	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
488	+	#endif
489	+	#if (defined(alpha) || defined(__alpha__))
490	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
491	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, char *addr, struct sigcontext *scp
492	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, addr, scp
493	+	#define SIGSEGV_FAULT_ADDRESS                   addr
494	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
495		#endif
496		#endif
497
498	<	// MacOS X
498	>	// Extract fault address out of a sigcontext
499	>	#if (defined(alpha) || defined(__alpha__))
500	>	// From Boehm's GC 6.0alpha8
501	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
502	>	{
503	>	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
504	>	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
505	>	fault_address += (signed long)(signed short)(instruction & 0xffff);
506	>	return (sigsegv_address_t)fault_address;
507	>	}
508	>	#endif
509	>
510	>
511	>	// MacOS X, not sure which version this works in. Under 10.1
512	>	// vm_protect does not appear to work from a signal handler. Under
513	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
514	>	// field is the address of the faulting instruction and not the
515	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
516	>	// case with Mach exception handlers there is a way to do what this
517	>	// was meant to do.
518	>	#ifndef HAVE_MACH_EXCEPTIONS
519		#if defined(__APPLE__) && defined(__MACH__)
520		#if (defined(ppc) || defined(__ppc__))
521		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
522	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
523		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
524		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
525		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
#	Line 366 | Line 539 | static sigsegv_address_t get_fault_addre
539		#endif
540		#endif
541		#endif
542	+	#endif
543	+
544	+	#if HAVE_WIN32_EXCEPTIONS
545	+	#define WIN32_LEAN_AND_MEAN /* avoid including junk */
546	+	#include <windows.h>
547	+	#include <winerror.h>
548	+
549	+	#if defined(_M_IX86)
550	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   EXCEPTION_POINTERS *ExceptionInfo
551	+	#define SIGSEGV_FAULT_HANDLER_ARGS              ExceptionInfo
552	+	#define SIGSEGV_FAULT_ADDRESS                   ExceptionInfo->ExceptionRecord->ExceptionInformation[1]
553	+	#define SIGSEGV_CONTEXT_REGS                    ExceptionInfo->ContextRecord
554	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS->Eip
555	+	#define SIGSEGV_REGISTER_FILE                   ((SIGSEGV_REGISTER_TYPE *)&SIGSEGV_CONTEXT_REGS->Edi)
556	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
557	+	#endif
558	+	#if defined(_M_X64)
559	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   EXCEPTION_POINTERS *ExceptionInfo
560	+	#define SIGSEGV_FAULT_HANDLER_ARGS              ExceptionInfo
561	+	#define SIGSEGV_FAULT_ADDRESS                   ExceptionInfo->ExceptionRecord->ExceptionInformation[1]
562	+	#define SIGSEGV_CONTEXT_REGS                    ExceptionInfo->ContextRecord
563	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS->Rip
564	+	#define SIGSEGV_REGISTER_FILE                   ((SIGSEGV_REGISTER_TYPE *)&SIGSEGV_CONTEXT_REGS->Rax)
565	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
566	+	#endif
567	+	#endif
568	+
569	+	#if HAVE_MACH_EXCEPTIONS
570	+
571	+	// This can easily be extended to other Mach systems, but really who
572	+	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
573	+	// Mach 2.5/3.0?
574	+	#if defined(__APPLE__) && defined(__MACH__)
575	+
576	+	#include <sys/types.h>
577	+	#include <stdlib.h>
578	+	#include <stdio.h>
579	+	#include <pthread.h>
580	+
581	+	/*
582	+	* If you are familiar with MIG then you will understand the frustration
583	+	* that was necessary to get these embedded into C++ code by hand.
584	+	*/
585	+	extern "C" {
586	+	#include <mach/mach.h>
587	+	#include <mach/mach_error.h>
588	+
589	+	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
590	+	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
591	+	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
592	+	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
593	+	exception_type_t, exception_data_t, mach_msg_type_number_t);
594	+	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
595	+	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
596	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
597	+	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
598	+	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
599	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
600	+	}
601	+
602	+	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
603	+	#define HANDLER_COUNT 64
604	+
605	+	// structure to tuck away existing exception handlers
606	+	typedef struct _ExceptionPorts {
607	+	mach_msg_type_number_t maskCount;
608	+	exception_mask_t masks[HANDLER_COUNT];
609	+	exception_handler_t handlers[HANDLER_COUNT];
610	+	exception_behavior_t behaviors[HANDLER_COUNT];
611	+	thread_state_flavor_t flavors[HANDLER_COUNT];
612	+	} ExceptionPorts;
613	+
614	+	// exception handler thread
615	+	static pthread_t exc_thread;
616	+
617	+	// place where old exception handler info is stored
618	+	static ExceptionPorts ports;
619	+
620	+	// our exception port
621	+	static mach_port_t _exceptionPort = MACH_PORT_NULL;
622	+
623	+	#define MACH_CHECK_ERROR(name,ret) \
624	+	if (ret != KERN_SUCCESS) { \
625	+	mach_error(#name, ret); \
626	+	exit (1); \
627	+	}
628	+
629	+	#ifdef __ppc__
630	+	#define SIGSEGV_EXCEPTION_STATE_TYPE    ppc_exception_state_t
631	+	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  PPC_EXCEPTION_STATE
632	+	#define SIGSEGV_EXCEPTION_STATE_COUNT   PPC_EXCEPTION_STATE_COUNT
633	+	#define SIGSEGV_FAULT_ADDRESS                   SIP->exc_state.dar
634	+	#define SIGSEGV_THREAD_STATE_TYPE               ppc_thread_state_t
635	+	#define SIGSEGV_THREAD_STATE_FLAVOR             PPC_THREAD_STATE
636	+	#define SIGSEGV_THREAD_STATE_COUNT              PPC_THREAD_STATE_COUNT
637	+	#define SIGSEGV_FAULT_INSTRUCTION               SIP->thr_state.srr0
638	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
639	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIP->thr_state.srr0, (unsigned long *)&SIP->thr_state.r0
640	+	#endif
641	+	#ifdef __ppc64__
642	+	#define SIGSEGV_EXCEPTION_STATE_TYPE    ppc_exception_state64_t
643	+	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  PPC_EXCEPTION_STATE64
644	+	#define SIGSEGV_EXCEPTION_STATE_COUNT   PPC_EXCEPTION_STATE64_COUNT
645	+	#define SIGSEGV_FAULT_ADDRESS                   SIP->exc_state.dar
646	+	#define SIGSEGV_THREAD_STATE_TYPE               ppc_thread_state64_t
647	+	#define SIGSEGV_THREAD_STATE_FLAVOR             PPC_THREAD_STATE64
648	+	#define SIGSEGV_THREAD_STATE_COUNT              PPC_THREAD_STATE64_COUNT
649	+	#define SIGSEGV_FAULT_INSTRUCTION               SIP->thr_state.srr0
650	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
651	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIP->thr_state.srr0, (unsigned long *)&SIP->thr_state.r0
652	+	#endif
653	+	#ifdef __i386__
654	+	#define SIGSEGV_EXCEPTION_STATE_TYPE    struct i386_exception_state
655	+	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  i386_EXCEPTION_STATE
656	+	#define SIGSEGV_EXCEPTION_STATE_COUNT   i386_EXCEPTION_STATE_COUNT
657	+	#define SIGSEGV_FAULT_ADDRESS                   SIP->exc_state.faultvaddr
658	+	#define SIGSEGV_THREAD_STATE_TYPE               struct i386_thread_state
659	+	#define SIGSEGV_THREAD_STATE_FLAVOR             i386_THREAD_STATE
660	+	#define SIGSEGV_THREAD_STATE_COUNT              i386_THREAD_STATE_COUNT
661	+	#define SIGSEGV_FAULT_INSTRUCTION               SIP->thr_state.eip
662	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
663	+	#define SIGSEGV_REGISTER_FILE                   ((SIGSEGV_REGISTER_TYPE *)&SIP->thr_state.eax) /* EAX is the first GPR we consider */
664	+	#endif
665	+	#ifdef __x86_64__
666	+	#define SIGSEGV_EXCEPTION_STATE_TYPE    struct x86_exception_state64
667	+	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  x86_EXCEPTION_STATE64
668	+	#define SIGSEGV_EXCEPTION_STATE_COUNT   x86_EXCEPTION_STATE64_COUNT
669	+	#define SIGSEGV_FAULT_ADDRESS                   SIP->exc_state.faultvaddr
670	+	#define SIGSEGV_THREAD_STATE_TYPE               struct x86_thread_state64
671	+	#define SIGSEGV_THREAD_STATE_FLAVOR             x86_THREAD_STATE64
672	+	#define SIGSEGV_THREAD_STATE_COUNT              x86_THREAD_STATE64_COUNT
673	+	#define SIGSEGV_FAULT_INSTRUCTION               SIP->thr_state.rip
674	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
675	+	#define SIGSEGV_REGISTER_FILE                   ((SIGSEGV_REGISTER_TYPE *)&SIP->thr_state.rax) /* RAX is the first GPR we consider */
676	+	#endif
677	+	#define SIGSEGV_FAULT_ADDRESS_FAST              code[1]
678	+	#define SIGSEGV_FAULT_INSTRUCTION_FAST  SIGSEGV_INVALID_ADDRESS
679	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code
680	+	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code
681	+
682	+	// Since there can only be one exception thread running at any time
683	+	// this is not a problem.
684	+	#define MSG_SIZE 512
685	+	static char msgbuf[MSG_SIZE];
686	+	static char replybuf[MSG_SIZE];
687	+
688	+	/*
689	+	* This is the entry point for the exception handler thread. The job
690	+	* of this thread is to wait for exception messages on the exception
691	+	* port that was setup beforehand and to pass them on to exc_server.
692	+	* exc_server is a MIG generated function that is a part of Mach.
693	+	* Its job is to decide what to do with the exception message. In our
694	+	* case exc_server calls catch_exception_raise on our behalf. After
695	+	* exc_server returns, it is our responsibility to send the reply.
696	+	*/
697	+	static void *
698	+	handleExceptions(void *priv)
699	+	{
700	+	mach_msg_header_t *msg, *reply;
701	+	kern_return_t krc;
702	+
703	+	msg = (mach_msg_header_t *)msgbuf;
704	+	reply = (mach_msg_header_t *)replybuf;
705	+
706	+	for (;;) {
707	+	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
708	+	_exceptionPort, 0, MACH_PORT_NULL);
709	+	MACH_CHECK_ERROR(mach_msg, krc);
710	+
711	+	if (!exc_server(msg, reply)) {
712	+	fprintf(stderr, "exc_server hated the message\n");
713	+	exit(1);
714	+	}
715	+
716	+	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
717	+	msg->msgh_local_port, 0, MACH_PORT_NULL);
718	+	if (krc != KERN_SUCCESS) {
719	+	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
720	+	krc, mach_error_string(krc));
721	+	exit(1);
722	+	}
723	+	}
724	+	}
725	+	#endif
726	+	#endif
727
728
729		/*
730		*  Instruction skipping
731		*/
732
733	+	#ifndef SIGSEGV_REGISTER_TYPE
734	+	#define SIGSEGV_REGISTER_TYPE sigsegv_uintptr_t
735	+	#endif
736	+
737		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
738		// Decode and skip X86 instruction
739	<	#if (defined(i386) || defined(__i386__))
739	>	#if (defined(i386) || defined(__i386__)) || (defined(__x86_64__) || defined(_M_X64))
740		#if defined(__linux__)
741		enum {
742	+	#if (defined(i386) || defined(__i386__))
743		X86_REG_EIP = 14,
744		X86_REG_EAX = 11,
745		X86_REG_ECX = 10,
#	Line 386 | Line 749 | enum {
749		X86_REG_EBP = 6,
750		X86_REG_ESI = 5,
751		X86_REG_EDI = 4
752	+	#endif
753	+	#if defined(__x86_64__)
754	+	X86_REG_R8  = 0,
755	+	X86_REG_R9  = 1,
756	+	X86_REG_R10 = 2,
757	+	X86_REG_R11 = 3,
758	+	X86_REG_R12 = 4,
759	+	X86_REG_R13 = 5,
760	+	X86_REG_R14 = 6,
761	+	X86_REG_R15 = 7,
762	+	X86_REG_EDI = 8,
763	+	X86_REG_ESI = 9,
764	+	X86_REG_EBP = 10,
765	+	X86_REG_EBX = 11,
766	+	X86_REG_EDX = 12,
767	+	X86_REG_EAX = 13,
768	+	X86_REG_ECX = 14,
769	+	X86_REG_ESP = 15,
770	+	X86_REG_EIP = 16
771	+	#endif
772	+	};
773	+	#endif
774	+	#if defined(__NetBSD__)
775	+	enum {
776	+	#if (defined(i386) || defined(__i386__))
777	+	X86_REG_EIP = _REG_EIP,
778	+	X86_REG_EAX = _REG_EAX,
779	+	X86_REG_ECX = _REG_ECX,
780	+	X86_REG_EDX = _REG_EDX,
781	+	X86_REG_EBX = _REG_EBX,
782	+	X86_REG_ESP = _REG_ESP,
783	+	X86_REG_EBP = _REG_EBP,
784	+	X86_REG_ESI = _REG_ESI,
785	+	X86_REG_EDI = _REG_EDI
786	+	#endif
787	+	};
788	+	#endif
789	+	#if defined(__FreeBSD__)
790	+	enum {
791	+	#if (defined(i386) || defined(__i386__))
792	+	X86_REG_EIP = 10,
793	+	X86_REG_EAX = 7,
794	+	X86_REG_ECX = 6,
795	+	X86_REG_EDX = 5,
796	+	X86_REG_EBX = 4,
797	+	X86_REG_ESP = 13,
798	+	X86_REG_EBP = 2,
799	+	X86_REG_ESI = 1,
800	+	X86_REG_EDI = 0
801	+	#endif
802	+	};
803	+	#endif
804	+	#if defined(__OpenBSD__)
805	+	enum {
806	+	#if defined(__i386__)
807	+	// EDI is the first register we consider
808	+	#define OREG(REG) offsetof(struct sigcontext, sc_##REG)
809	+	#define DREG(REG) ((OREG(REG) - OREG(edi)) / 4)
810	+	X86_REG_EIP = DREG(eip), // 7
811	+	X86_REG_EAX = DREG(eax), // 6
812	+	X86_REG_ECX = DREG(ecx), // 5
813	+	X86_REG_EDX = DREG(edx), // 4
814	+	X86_REG_EBX = DREG(ebx), // 3
815	+	X86_REG_ESP = DREG(esp), // 10
816	+	X86_REG_EBP = DREG(ebp), // 2
817	+	X86_REG_ESI = DREG(esi), // 1
818	+	X86_REG_EDI = DREG(edi)  // 0
819	+	#undef DREG
820	+	#undef OREG
821	+	#endif
822	+	};
823	+	#endif
824	+	#if defined(__sun__)
825	+	// Same as for Linux, need to check for x86-64
826	+	enum {
827	+	#if defined(__i386__)
828	+	X86_REG_EIP = EIP,
829	+	X86_REG_EAX = EAX,
830	+	X86_REG_ECX = ECX,
831	+	X86_REG_EDX = EDX,
832	+	X86_REG_EBX = EBX,
833	+	X86_REG_ESP = ESP,
834	+	X86_REG_EBP = EBP,
835	+	X86_REG_ESI = ESI,
836	+	X86_REG_EDI = EDI
837	+	#endif
838	+	};
839	+	#endif
840	+	#if defined(__APPLE__) && defined(__MACH__)
841	+	enum {
842	+	#if (defined(i386) || defined(__i386__))
843	+	#ifdef i386_SAVED_STATE
844	+	// same as FreeBSD (in Open Darwin 8.0.1)
845	+	X86_REG_EIP = 10,
846	+	X86_REG_EAX = 7,
847	+	X86_REG_ECX = 6,
848	+	X86_REG_EDX = 5,
849	+	X86_REG_EBX = 4,
850	+	X86_REG_ESP = 13,
851	+	X86_REG_EBP = 2,
852	+	X86_REG_ESI = 1,
853	+	X86_REG_EDI = 0
854	+	#else
855	+	// new layout (MacOS X 10.4.4 for x86)
856	+	X86_REG_EIP = 10,
857	+	X86_REG_EAX = 0,
858	+	X86_REG_ECX = 2,
859	+	X86_REG_EDX = 3,
860	+	X86_REG_EBX = 1,
861	+	X86_REG_ESP = 7,
862	+	X86_REG_EBP = 6,
863	+	X86_REG_ESI = 5,
864	+	X86_REG_EDI = 4
865	+	#endif
866	+	#endif
867	+	#if defined(__x86_64__)
868	+	X86_REG_R8  = 8,
869	+	X86_REG_R9  = 9,
870	+	X86_REG_R10 = 10,
871	+	X86_REG_R11 = 11,
872	+	X86_REG_R12 = 12,
873	+	X86_REG_R13 = 13,
874	+	X86_REG_R14 = 14,
875	+	X86_REG_R15 = 15,
876	+	X86_REG_EDI = 4,
877	+	X86_REG_ESI = 5,
878	+	X86_REG_EBP = 6,
879	+	X86_REG_EBX = 1,
880	+	X86_REG_EDX = 3,
881	+	X86_REG_EAX = 0,
882	+	X86_REG_ECX = 2,
883	+	X86_REG_ESP = 7,
884	+	X86_REG_EIP = 16
885	+	#endif
886	+	};
887	+	#endif
888	+	#if defined(_WIN32)
889	+	enum {
890	+	#if defined(_M_IX86)
891	+	X86_REG_EIP = 7,
892	+	X86_REG_EAX = 5,
893	+	X86_REG_ECX = 4,
894	+	X86_REG_EDX = 3,
895	+	X86_REG_EBX = 2,
896	+	X86_REG_ESP = 10,
897	+	X86_REG_EBP = 6,
898	+	X86_REG_ESI = 1,
899	+	X86_REG_EDI = 0
900	+	#endif
901	+	#if defined(_M_X64)
902	+	X86_REG_EAX = 0,
903	+	X86_REG_ECX = 1,
904	+	X86_REG_EDX = 2,
905	+	X86_REG_EBX = 3,
906	+	X86_REG_ESP = 4,
907	+	X86_REG_EBP = 5,
908	+	X86_REG_ESI = 6,
909	+	X86_REG_EDI = 7,
910	+	X86_REG_R8  = 8,
911	+	X86_REG_R9  = 9,
912	+	X86_REG_R10 = 10,
913	+	X86_REG_R11 = 11,
914	+	X86_REG_R12 = 12,
915	+	X86_REG_R13 = 13,
916	+	X86_REG_R14 = 14,
917	+	X86_REG_R15 = 15,
918	+	X86_REG_EIP = 16
919	+	#endif
920		};
921		#endif
922		// FIXME: this is partly redundant with the instruction decoding phase
#	Line 422 | Line 953 | static inline int ix86_step_over_modrm(u
953		return offset;
954		}
955
956	<	static bool ix86_skip_instruction(unsigned int * regs)
956	>	static bool ix86_skip_instruction(SIGSEGV_REGISTER_TYPE * regs)
957		{
958		unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
959
960		if (eip == 0)
961		return false;
962	+	#ifdef _WIN32
963	+	if (IsBadCodePtr((FARPROC)eip))
964	+	return false;
965	+	#endif
966
967	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
967	>	enum instruction_type_t {
968	>	i_MOV,
969	>	i_ADD
970	>	};
971	>
972	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
973		transfer_size_t transfer_size = SIZE_LONG;
974	+	instruction_type_t instruction_type = i_MOV;
975
976		int reg = -1;
977		int len = 0;
978	<
978	>
979	>	#if DEBUG
980	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
981	>	eip, eip[0], eip[1], eip[2], eip[3]);
982	>	#endif
983	>
984		// Operand size prefix
985		if (*eip == 0x66) {
986		eip++;
#	Line 442 | Line 988 | static bool ix86_skip_instruction(unsign
988		transfer_size = SIZE_WORD;
989		}
990
991	+	// REX prefix
992	+	#if defined(__x86_64__) || defined(_M_X64)
993	+	struct rex_t {
994	+	unsigned char W;
995	+	unsigned char R;
996	+	unsigned char X;
997	+	unsigned char B;
998	+	};
999	+	rex_t rex = { 0, 0, 0, 0 };
1000	+	bool has_rex = false;
1001	+	if ((*eip & 0xf0) == 0x40) {
1002	+	has_rex = true;
1003	+	const unsigned char b = *eip;
1004	+	rex.W = b & (1 << 3);
1005	+	rex.R = b & (1 << 2);
1006	+	rex.X = b & (1 << 1);
1007	+	rex.B = b & (1 << 0);
1008	+	#if DEBUG
1009	+	printf("REX: %c,%c,%c,%c\n",
1010	+	rex.W ? 'W' : '_',
1011	+	rex.R ? 'R' : '_',
1012	+	rex.X ? 'X' : '_',
1013	+	rex.B ? 'B' : '_');
1014	+	#endif
1015	+	eip++;
1016	+	len++;
1017	+	if (rex.W)
1018	+	transfer_size = SIZE_QUAD;
1019	+	}
1020	+	#else
1021	+	const bool has_rex = false;
1022	+	#endif
1023	+
1024		// Decode instruction
1025	+	int op_len = 1;
1026	+	int target_size = SIZE_UNKNOWN;
1027		switch (eip[0]) {
1028	+	case 0x0f:
1029	+	target_size = transfer_size;
1030	+	switch (eip[1]) {
1031	+	case 0xbe: // MOVSX r32, r/m8
1032	+	case 0xb6: // MOVZX r32, r/m8
1033	+	transfer_size = SIZE_BYTE;
1034	+	goto do_mov_extend;
1035	+	case 0xbf: // MOVSX r32, r/m16
1036	+	case 0xb7: // MOVZX r32, r/m16
1037	+	transfer_size = SIZE_WORD;
1038	+	goto do_mov_extend;
1039	+	do_mov_extend:
1040	+	op_len = 2;
1041	+	goto do_transfer_load;
1042	+	}
1043	+	break;
1044	+	#if defined(__x86_64__) || defined(_M_X64)
1045	+	case 0x63: // MOVSXD r64, r/m32
1046	+	if (has_rex && rex.W) {
1047	+	transfer_size = SIZE_LONG;
1048	+	target_size = SIZE_QUAD;
1049	+	}
1050	+	else if (transfer_size != SIZE_WORD) {
1051	+	transfer_size = SIZE_LONG;
1052	+	target_size = SIZE_QUAD;
1053	+	}
1054	+	goto do_transfer_load;
1055	+	#endif
1056	+	case 0x02: // ADD r8, r/m8
1057	+	transfer_size = SIZE_BYTE;
1058	+	case 0x03: // ADD r32, r/m32
1059	+	instruction_type = i_ADD;
1060	+	goto do_transfer_load;
1061		case 0x8a: // MOV r8, r/m8
1062		transfer_size = SIZE_BYTE;
1063		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
1064	<	switch (eip[1] & 0xc0) {
1064	>	do_transfer_load:
1065	>	switch (eip[op_len] & 0xc0) {
1066		case 0x80:
1067	<	reg = (eip[1] >> 3) & 7;
1068	<	transfer_type = TYPE_LOAD;
1067	>	reg = (eip[op_len] >> 3) & 7;
1068	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1069		break;
1070		case 0x40:
1071	<	reg = (eip[1] >> 3) & 7;
1072	<	transfer_type = TYPE_LOAD;
1071	>	reg = (eip[op_len] >> 3) & 7;
1072	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1073		break;
1074		case 0x00:
1075	<	reg = (eip[1] >> 3) & 7;
1076	<	transfer_type = TYPE_LOAD;
1075	>	reg = (eip[op_len] >> 3) & 7;
1076	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1077		break;
1078		}
1079	<	len += 2 + ix86_step_over_modrm(eip + 1);
1079	>	len += 1 + op_len + ix86_step_over_modrm(eip + op_len);
1080		break;
1081	+	case 0x00: // ADD r/m8, r8
1082	+	transfer_size = SIZE_BYTE;
1083	+	case 0x01: // ADD r/m32, r32
1084	+	instruction_type = i_ADD;
1085	+	goto do_transfer_store;
1086		case 0x88: // MOV r/m8, r8
1087		transfer_size = SIZE_BYTE;
1088		case 0x89: // MOV r/m32, r32 (or 16-bit operation)
1089	<	switch (eip[1] & 0xc0) {
1089	>	do_transfer_store:
1090	>	switch (eip[op_len] & 0xc0) {
1091		case 0x80:
1092	<	reg = (eip[1] >> 3) & 7;
1093	<	transfer_type = TYPE_STORE;
1092	>	reg = (eip[op_len] >> 3) & 7;
1093	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1094		break;
1095		case 0x40:
1096	<	reg = (eip[1] >> 3) & 7;
1097	<	transfer_type = TYPE_STORE;
1096	>	reg = (eip[op_len] >> 3) & 7;
1097	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1098		break;
1099		case 0x00:
1100	<	reg = (eip[1] >> 3) & 7;
1101	<	transfer_type = TYPE_STORE;
1100	>	reg = (eip[op_len] >> 3) & 7;
1101	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1102		break;
1103		}
1104	<	len += 2 + ix86_step_over_modrm(eip + 1);
1104	>	len += 1 + op_len + ix86_step_over_modrm(eip + op_len);
1105		break;
1106		}
1107	+	if (target_size == SIZE_UNKNOWN)
1108	+	target_size = transfer_size;
1109
1110	<	if (transfer_type == TYPE_UNKNOWN) {
1110	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1111		// Unknown machine code, let it crash. Then patch the decoder
1112		return false;
1113		}
1114
1115	<	if (transfer_type == TYPE_LOAD && reg != -1) {
1116	<	static const int x86_reg_map[8] = {
1115	>	#if defined(__x86_64__) || defined(_M_X64)
1116	>	if (rex.R)
1117	>	reg += 8;
1118	>	#endif
1119	>
1120	>	if (instruction_type == i_MOV && transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
1121	>	static const int x86_reg_map[] = {
1122		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
1123	<	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
1123	>	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
1124	>	#if defined(__x86_64__) || defined(_M_X64)
1125	>	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
1126	>	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
1127	>	#endif
1128		};
1129
1130	<	if (reg < 0 || reg >= 8)
1130	>	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
1131		return false;
1132
1133	+	// Set 0 to the relevant register part
1134	+	// NOTE: this is only valid for MOV alike instructions
1135		int rloc = x86_reg_map[reg];
1136	<	switch (transfer_size) {
1136	>	switch (target_size) {
1137		case SIZE_BYTE:
1138	<	regs[rloc] = (regs[rloc] & ~0xff);
1138	>	if (has_rex || reg < 4)
1139	>	regs[rloc] = (regs[rloc] & ~0x00ffL);
1140	>	else {
1141	>	rloc = x86_reg_map[reg - 4];
1142	>	regs[rloc] = (regs[rloc] & ~0xff00L);
1143	>	}
1144		break;
1145		case SIZE_WORD:
1146	<	regs[rloc] = (regs[rloc] & ~0xffff);
1146	>	regs[rloc] = (regs[rloc] & ~0xffffL);
1147		break;
1148		case SIZE_LONG:
1149	+	case SIZE_QUAD: // zero-extension
1150		regs[rloc] = 0;
1151		break;
1152		}
1153		}
1154
1155		#if DEBUG
1156	<	printf("%08x: %s %s access", regs[X86_REG_EIP],
1157	<	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
1158	<	transfer_type == TYPE_LOAD ? "read" : "write");
1156	>	printf("%p: %s %s access", (void *)regs[X86_REG_EIP],
1157	>	transfer_size == SIZE_BYTE ? "byte" :
1158	>	transfer_size == SIZE_WORD ? "word" :
1159	>	transfer_size == SIZE_LONG ? "long" :
1160	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1161	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1162
1163		if (reg != -1) {
1164	<	static const char * x86_reg_str_map[8] = {
1165	<	"eax", "ecx", "edx", "ebx",
1166	<	"esp", "ebp", "esi", "edi"
1164	>	static const char * x86_byte_reg_str_map[] = {
1165	>	"al",   "cl",   "dl",   "bl",
1166	>	"spl",  "bpl",  "sil",  "dil",
1167	>	"r8b",  "r9b",  "r10b", "r11b",
1168	>	"r12b", "r13b", "r14b", "r15b",
1169	>	"ah",   "ch",   "dh",   "bh",
1170	>	};
1171	>	static const char * x86_word_reg_str_map[] = {
1172	>	"ax",   "cx",   "dx",   "bx",
1173	>	"sp",   "bp",   "si",   "di",
1174	>	"r8w",  "r9w",  "r10w", "r11w",
1175	>	"r12w", "r13w", "r14w", "r15w",
1176	>	};
1177	>	static const char *x86_long_reg_str_map[] = {
1178	>	"eax",  "ecx",  "edx",  "ebx",
1179	>	"esp",  "ebp",  "esi",  "edi",
1180	>	"r8d",  "r9d",  "r10d", "r11d",
1181	>	"r12d", "r13d", "r14d", "r15d",
1182		};
1183	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
1183	>	static const char *x86_quad_reg_str_map[] = {
1184	>	"rax", "rcx", "rdx", "rbx",
1185	>	"rsp", "rbp", "rsi", "rdi",
1186	>	"r8",  "r9",  "r10", "r11",
1187	>	"r12", "r13", "r14", "r15",
1188	>	};
1189	>	const char * reg_str = NULL;
1190	>	switch (target_size) {
1191	>	case SIZE_BYTE:
1192	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
1193	>	break;
1194	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
1195	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
1196	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
1197	>	}
1198	>	if (reg_str)
1199	>	printf(" %s register %%%s",
1200	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
1201	>	reg_str);
1202		}
1203		printf(", %d bytes instruction\n", len);
1204		#endif
#	Line 532 | Line 1208 | static bool ix86_skip_instruction(unsign
1208		}
1209		#endif
1210
1211	+	// Decode and skip IA-64 instruction
1212	+	#if defined(__ia64__)
1213	+	#if defined(__linux__)
1214	+	// We can directly patch the slot number
1215	+	#define IA64_CAN_PATCH_IP_SLOT 1
1216	+	// Helper macros to access the machine context
1217	+	#define IA64_CONTEXT_TYPE               struct sigcontext *
1218	+	#define IA64_CONTEXT                    scp
1219	+	#define IA64_GET_IP()                   (IA64_CONTEXT->sc_ip)
1220	+	#define IA64_SET_IP(V)                  (IA64_CONTEXT->sc_ip = (V))
1221	+	#define IA64_GET_PR(P)                  ((IA64_CONTEXT->sc_pr >> (P)) & 1)
1222	+	#define IA64_GET_NAT(I)                 ((IA64_CONTEXT->sc_nat >> (I)) & 1)
1223	+	#define IA64_SET_NAT(I,V)               (IA64_CONTEXT->sc_nat= (IA64_CONTEXT->sc_nat & ~(1ul << (I))) | (((unsigned long)!!(V)) << (I)))
1224	+	#define IA64_GET_GR(R)                  (IA64_CONTEXT->sc_gr[(R)])
1225	+	#define IA64_SET_GR(R,V)                (IA64_CONTEXT->sc_gr[(R)] = (V))
1226	+	#endif
1227	+
1228	+	// Instruction operations
1229	+	enum {
1230	+	IA64_INST_UNKNOWN = 0,
1231	+	IA64_INST_LD1,                          // ld1 op0=[op1]
1232	+	IA64_INST_LD1_UPDATE,           // ld1 op0=[op1],op2
1233	+	IA64_INST_LD2,                          // ld2 op0=[op1]
1234	+	IA64_INST_LD2_UPDATE,           // ld2 op0=[op1],op2
1235	+	IA64_INST_LD4,                          // ld4 op0=[op1]
1236	+	IA64_INST_LD4_UPDATE,           // ld4 op0=[op1],op2
1237	+	IA64_INST_LD8,                          // ld8 op0=[op1]
1238	+	IA64_INST_LD8_UPDATE,           // ld8 op0=[op1],op2
1239	+	IA64_INST_ST1,                          // st1 [op0]=op1
1240	+	IA64_INST_ST1_UPDATE,           // st1 [op0]=op1,op2
1241	+	IA64_INST_ST2,                          // st2 [op0]=op1
1242	+	IA64_INST_ST2_UPDATE,           // st2 [op0]=op1,op2
1243	+	IA64_INST_ST4,                          // st4 [op0]=op1
1244	+	IA64_INST_ST4_UPDATE,           // st4 [op0]=op1,op2
1245	+	IA64_INST_ST8,                          // st8 [op0]=op1
1246	+	IA64_INST_ST8_UPDATE,           // st8 [op0]=op1,op2
1247	+	IA64_INST_ADD,                          // add op0=op1,op2,op3
1248	+	IA64_INST_SUB,                          // sub op0=op1,op2,op3
1249	+	IA64_INST_SHLADD,                       // shladd op0=op1,op3,op2
1250	+	IA64_INST_AND,                          // and op0=op1,op2
1251	+	IA64_INST_ANDCM,                        // andcm op0=op1,op2
1252	+	IA64_INST_OR,                           // or op0=op1,op2
1253	+	IA64_INST_XOR,                          // xor op0=op1,op2
1254	+	IA64_INST_SXT1,                         // sxt1 op0=op1
1255	+	IA64_INST_SXT2,                         // sxt2 op0=op1
1256	+	IA64_INST_SXT4,                         // sxt4 op0=op1
1257	+	IA64_INST_ZXT1,                         // zxt1 op0=op1
1258	+	IA64_INST_ZXT2,                         // zxt2 op0=op1
1259	+	IA64_INST_ZXT4,                         // zxt4 op0=op1
1260	+	IA64_INST_NOP                           // nop op0
1261	+	};
1262	+
1263	+	const int IA64_N_OPERANDS = 4;
1264	+
1265	+	// Decoded operand type
1266	+	struct ia64_operand_t {
1267	+	unsigned char commit;           // commit result of operation to register file?
1268	+	unsigned char valid;            // XXX: not really used, can be removed (debug)
1269	+	signed char index;                      // index of GPR, or -1 if immediate value
1270	+	unsigned char nat;                      // NaT state before operation
1271	+	unsigned long value;            // register contents or immediate value
1272	+	};
1273	+
1274	+	// Decoded instruction type
1275	+	struct ia64_instruction_t {
1276	+	unsigned char mnemo;            // operation to perform
1277	+	unsigned char pred;                     // predicate register to check
1278	+	unsigned char no_memory;        // used to emulated main fault instruction
1279	+	unsigned long inst;                     // the raw instruction bits (41-bit wide)
1280	+	ia64_operand_t operands[IA64_N_OPERANDS];
1281	+	};
1282	+
1283	+	// Get immediate sign-bit
1284	+	static inline int ia64_inst_get_sbit(unsigned long inst)
1285	+	{
1286	+	return (inst >> 36) & 1;
1287	+	}
1288	+
1289	+	// Get 8-bit immediate value (A3, A8, I27, M30)
1290	+	static inline unsigned long ia64_inst_get_imm8(unsigned long inst)
1291	+	{
1292	+	unsigned long value = (inst >> 13) & 0x7ful;
1293	+	if (ia64_inst_get_sbit(inst))
1294	+	value |= ~0x7ful;
1295	+	return value;
1296	+	}
1297	+
1298	+	// Get 9-bit immediate value (M3)
1299	+	static inline unsigned long ia64_inst_get_imm9b(unsigned long inst)
1300	+	{
1301	+	unsigned long value = (((inst >> 27) & 1) << 7) | ((inst >> 13) & 0x7f);
1302	+	if (ia64_inst_get_sbit(inst))
1303	+	value |= ~0xfful;
1304	+	return value;
1305	+	}
1306	+
1307	+	// Get 9-bit immediate value (M5)
1308	+	static inline unsigned long ia64_inst_get_imm9a(unsigned long inst)
1309	+	{
1310	+	unsigned long value = (((inst >> 27) & 1) << 7) | ((inst >> 6) & 0x7f);
1311	+	if (ia64_inst_get_sbit(inst))
1312	+	value |= ~0xfful;
1313	+	return value;
1314	+	}
1315	+
1316	+	// Get 14-bit immediate value (A4)
1317	+	static inline unsigned long ia64_inst_get_imm14(unsigned long inst)
1318	+	{
1319	+	unsigned long value = (((inst >> 27) & 0x3f) << 7) | (inst & 0x7f);
1320	+	if (ia64_inst_get_sbit(inst))
1321	+	value |= ~0x1fful;
1322	+	return value;
1323	+	}
1324	+
1325	+	// Get 22-bit immediate value (A5)
1326	+	static inline unsigned long ia64_inst_get_imm22(unsigned long inst)
1327	+	{
1328	+	unsigned long value = ((((inst >> 22) & 0x1f) << 16) |
1329	+	(((inst >> 27) & 0x1ff) << 7) |
1330	+	(inst & 0x7f));
1331	+	if (ia64_inst_get_sbit(inst))
1332	+	value |= ~0x1ffffful;
1333	+	return value;
1334	+	}
1335	+
1336	+	// Get 21-bit immediate value (I19)
1337	+	static inline unsigned long ia64_inst_get_imm21(unsigned long inst)
1338	+	{
1339	+	return (((inst >> 36) & 1) << 20) | ((inst >> 6) & 0xfffff);
1340	+	}
1341	+
1342	+	// Get 2-bit count value (A2)
1343	+	static inline int ia64_inst_get_count2(unsigned long inst)
1344	+	{
1345	+	return (inst >> 27) & 0x3;
1346	+	}
1347	+
1348	+	// Get bundle template
1349	+	static inline unsigned int ia64_get_template(unsigned long raw_ip)
1350	+	{
1351	+	unsigned long *ip = (unsigned long *)(raw_ip & ~3ul);
1352	+	return ip[0] & 0x1f;
1353	+	}
1354	+
1355	+	// Get specified instruction in bundle
1356	+	static unsigned long ia64_get_instruction(unsigned long raw_ip, int slot)
1357	+	{
1358	+	unsigned long inst;
1359	+	unsigned long *ip = (unsigned long *)(raw_ip & ~3ul);
1360	+	#if DEBUG
1361	+	printf("Bundle: %016lx%016lx\n", ip[1], ip[0]);
1362	+	#endif
1363	+
1364	+	switch (slot) {
1365	+	case 0:
1366	+	inst = (ip[0] >> 5) & 0x1fffffffffful;
1367	+	break;
1368	+	case 1:
1369	+	inst = ((ip[1] & 0x7ffffful) << 18) | ((ip[0] >> 46) & 0x3fffful);
1370	+	break;
1371	+	case 2:
1372	+	inst = (ip[1] >> 23) & 0x1fffffffffful;
1373	+	break;
1374	+	case 3:
1375	+	fprintf(stderr, "ERROR: ia64_get_instruction(), invalid slot number %d\n", slot);
1376	+	abort();
1377	+	break;
1378	+	}
1379	+
1380	+	#if DEBUG
1381	+	printf(" Instruction %d: 0x%016lx\n", slot, inst);
1382	+	#endif
1383	+	return inst;
1384	+	}
1385	+
1386	+	// Decode group 0 instructions
1387	+	static bool ia64_decode_instruction_0(ia64_instruction_t *inst, IA64_CONTEXT_TYPE IA64_CONTEXT)
1388	+	{
1389	+	const int r1 = (inst->inst >>  6) & 0x7f;
1390	+	const int r3 = (inst->inst >> 20) & 0x7f;
1391	+
1392	+	const int x3 = (inst->inst >> 33) & 0x07;
1393	+	const int x6 = (inst->inst >> 27) & 0x3f;
1394	+	const int x2 = (inst->inst >> 31) & 0x03;
1395	+	const int x4 = (inst->inst >> 27) & 0x0f;
1396	+
1397	+	if (x3 == 0) {
1398	+	switch (x6) {
1399	+	case 0x01:                                              // nop.i (I19)
1400	+	inst->mnemo = IA64_INST_NOP;
1401	+	inst->operands[0].valid = true;
1402	+	inst->operands[0].index = -1;
1403	+	inst->operands[0].value = ia64_inst_get_imm21(inst->inst);
1404	+	return true;
1405	+	case 0x14:                                              // sxt1 (I29)
1406	+	case 0x15:                                              // sxt2 (I29)
1407	+	case 0x16:                                              // sxt4 (I29)
1408	+	case 0x10:                                              // zxt1 (I29)
1409	+	case 0x11:                                              // zxt2 (I29)
1410	+	case 0x12:                                              // zxt4 (I29)
1411	+	switch (x6) {
1412	+	case 0x14: inst->mnemo = IA64_INST_SXT1; break;
1413	+	case 0x15: inst->mnemo = IA64_INST_SXT2; break;
1414	+	case 0x16: inst->mnemo = IA64_INST_SXT4; break;
1415	+	case 0x10: inst->mnemo = IA64_INST_ZXT1; break;
1416	+	case 0x11: inst->mnemo = IA64_INST_ZXT2; break;
1417	+	case 0x12: inst->mnemo = IA64_INST_ZXT4; break;
1418	+	default: abort();
1419	+	}
1420	+	inst->operands[0].valid = true;
1421	+	inst->operands[0].index = r1;
1422	+	inst->operands[1].valid = true;
1423	+	inst->operands[1].index = r3;
1424	+	inst->operands[1].value = IA64_GET_GR(r3);
1425	+	inst->operands[1].nat   = IA64_GET_NAT(r3);
1426	+	return true;
1427	+	}
1428	+	}
1429	+	return false;
1430	+	}
1431	+
1432	+	// Decode group 4 instructions (load/store instructions)
1433	+	static bool ia64_decode_instruction_4(ia64_instruction_t *inst, IA64_CONTEXT_TYPE IA64_CONTEXT)
1434	+	{
1435	+	const int r1 = (inst->inst >> 6) & 0x7f;
1436	+	const int r2 = (inst->inst >> 13) & 0x7f;
1437	+	const int r3 = (inst->inst >> 20) & 0x7f;
1438	+
1439	+	const int m  = (inst->inst >> 36) & 1;
1440	+	const int x  = (inst->inst >> 27) & 1;
1441	+	const int x6 = (inst->inst >> 30) & 0x3f;
1442	+
1443	+	switch (x6) {
1444	+	case 0x00:
1445	+	case 0x01:
1446	+	case 0x02:
1447	+	case 0x03:
1448	+	if (x == 0) {
1449	+	inst->operands[0].valid = true;
1450	+	inst->operands[0].index = r1;
1451	+	inst->operands[1].valid = true;
1452	+	inst->operands[1].index = r3;
1453	+	inst->operands[1].value = IA64_GET_GR(r3);
1454	+	inst->operands[1].nat   = IA64_GET_NAT(r3);
1455	+	if (m == 0) {
1456	+	switch (x6) {
1457	+	case 0x00: inst->mnemo = IA64_INST_LD1; break;
1458	+	case 0x01: inst->mnemo = IA64_INST_LD2; break;
1459	+	case 0x02: inst->mnemo = IA64_INST_LD4; break;
1460	+	case 0x03: inst->mnemo = IA64_INST_LD8; break;
1461	+	}
1462	+	}
1463	+	else {
1464	+	inst->operands[2].valid = true;
1465	+	inst->operands[2].index = r2;
1466	+	inst->operands[2].value = IA64_GET_GR(r2);
1467	+	inst->operands[2].nat   = IA64_GET_NAT(r2);
1468	+	switch (x6) {
1469	+	case 0x00: inst->mnemo = IA64_INST_LD1_UPDATE; break;
1470	+	case 0x01: inst->mnemo = IA64_INST_LD2_UPDATE; break;
1471	+	case 0x02: inst->mnemo = IA64_INST_LD4_UPDATE; break;
1472	+	case 0x03: inst->mnemo = IA64_INST_LD8_UPDATE; break;
1473	+	}
1474	+	}
1475	+	return true;
1476	+	}
1477	+	break;
1478	+	case 0x30:
1479	+	case 0x31:
1480	+	case 0x32:
1481	+	case 0x33:
1482	+	if (m == 0 && x == 0) {
1483	+	inst->operands[0].valid = true;
1484	+	inst->operands[0].index = r3;
1485	+	inst->operands[0].value = IA64_GET_GR(r3);
1486	+	inst->operands[0].nat   = IA64_GET_NAT(r3);
1487	+	inst->operands[1].valid = true;
1488	+	inst->operands[1].index = r2;
1489	+	inst->operands[1].value = IA64_GET_GR(r2);
1490	+	inst->operands[1].nat   = IA64_GET_NAT(r2);
1491	+	switch (x6) {
1492	+	case 0x30: inst->mnemo = IA64_INST_ST1; break;
1493	+	case 0x31: inst->mnemo = IA64_INST_ST2; break;
1494	+	case 0x32: inst->mnemo = IA64_INST_ST4; break;
1495	+	case 0x33: inst->mnemo = IA64_INST_ST8; break;
1496	+	}
1497	+	return true;
1498	+	}
1499	+	break;
1500	+	}
1501	+	return false;
1502	+	}
1503	+
1504	+	// Decode group 5 instructions (load/store instructions)
1505	+	static bool ia64_decode_instruction_5(ia64_instruction_t *inst, IA64_CONTEXT_TYPE IA64_CONTEXT)
1506	+	{
1507	+	const int r1 = (inst->inst >> 6) & 0x7f;
1508	+	const int r2 = (inst->inst >> 13) & 0x7f;
1509	+	const int r3 = (inst->inst >> 20) & 0x7f;
1510	+
1511	+	const int x6 = (inst->inst >> 30) & 0x3f;
1512	+
1513	+	switch (x6) {
1514	+	case 0x00:
1515	+	case 0x01:
1516	+	case 0x02:
1517	+	case 0x03:
1518	+	inst->operands[0].valid = true;
1519	+	inst->operands[0].index = r1;
1520	+	inst->operands[1].valid = true;
1521	+	inst->operands[1].index = r3;
1522	+	inst->operands[1].value = IA64_GET_GR(r3);
1523	+	inst->operands[1].nat   = IA64_GET_NAT(r3);
1524	+	inst->operands[2].valid = true;
1525	+	inst->operands[2].index = -1;
1526	+	inst->operands[2].value = ia64_inst_get_imm9b(inst->inst);
1527	+	inst->operands[2].nat   = 0;
1528	+	switch (x6) {
1529	+	case 0x00: inst->mnemo = IA64_INST_LD1_UPDATE; break;
1530	+	case 0x01: inst->mnemo = IA64_INST_LD2_UPDATE; break;
1531	+	case 0x02: inst->mnemo = IA64_INST_LD4_UPDATE; break;
1532	+	case 0x03: inst->mnemo = IA64_INST_LD8_UPDATE; break;
1533	+	}
1534	+	return true;
1535	+	case 0x30:
1536	+	case 0x31:
1537	+	case 0x32:
1538	+	case 0x33:
1539	+	inst->operands[0].valid = true;
1540	+	inst->operands[0].index = r3;
1541	+	inst->operands[0].value = IA64_GET_GR(r3);
1542	+	inst->operands[0].nat   = IA64_GET_NAT(r3);
1543	+	inst->operands[1].valid = true;
1544	+	inst->operands[1].index = r2;
1545	+	inst->operands[1].value = IA64_GET_GR(r2);
1546	+	inst->operands[1].nat   = IA64_GET_NAT(r2);
1547	+	inst->operands[2].valid = true;
1548	+	inst->operands[2].index = -1;
1549	+	inst->operands[2].value = ia64_inst_get_imm9a(inst->inst);
1550	+	inst->operands[2].nat   = 0;
1551	+	switch (x6) {
1552	+	case 0x30: inst->mnemo = IA64_INST_ST1_UPDATE; break;
1553	+	case 0x31: inst->mnemo = IA64_INST_ST2_UPDATE; break;
1554	+	case 0x32: inst->mnemo = IA64_INST_ST4_UPDATE; break;
1555	+	case 0x33: inst->mnemo = IA64_INST_ST8_UPDATE; break;
1556	+	}
1557	+	return true;
1558	+	}
1559	+	return false;
1560	+	}
1561	+
1562	+	// Decode group 8 instructions (ALU integer)
1563	+	static bool ia64_decode_instruction_8(ia64_instruction_t *inst, IA64_CONTEXT_TYPE IA64_CONTEXT)
1564	+	{
1565	+	const int r1  = (inst->inst >> 6) & 0x7f;
1566	+	const int r2  = (inst->inst >> 13) & 0x7f;
1567	+	const int r3  = (inst->inst >> 20) & 0x7f;
1568	+
1569	+	const int x2a = (inst->inst >> 34) & 0x3;
1570	+	const int x2b = (inst->inst >> 27) & 0x3;
1571	+	const int x4  = (inst->inst >> 29) & 0xf;
1572	+	const int ve  = (inst->inst >> 33) & 0x1;
1573	+
1574	+	// destination register (r1) is always valid in this group
1575	+	inst->operands[0].valid = true;
1576	+	inst->operands[0].index = r1;
1577	+
1578	+	// source register (r3) is always valid in this group
1579	+	inst->operands[2].valid = true;
1580	+	inst->operands[2].index = r3;
1581	+	inst->operands[2].value = IA64_GET_GR(r3);
1582	+	inst->operands[2].nat   = IA64_GET_NAT(r3);
1583	+
1584	+	if (x2a == 0 && ve == 0) {
1585	+	inst->operands[1].valid = true;
1586	+	inst->operands[1].index = r2;
1587	+	inst->operands[1].value = IA64_GET_GR(r2);
1588	+	inst->operands[1].nat   = IA64_GET_NAT(r2);
1589	+	switch (x4) {
1590	+	case 0x0:                               // add (A1)
1591	+	inst->mnemo = IA64_INST_ADD;
1592	+	inst->operands[3].valid = true;
1593	+	inst->operands[3].index = -1;
1594	+	inst->operands[3].value = x2b == 1;
1595	+	return true;
1596	+	case 0x1:                               // add (A1)
1597	+	inst->mnemo = IA64_INST_SUB;
1598	+	inst->operands[3].valid = true;
1599	+	inst->operands[3].index = -1;
1600	+	inst->operands[3].value = x2b == 0;
1601	+	return true;
1602	+	case 0x4:                               // shladd (A2)
1603	+	inst->mnemo = IA64_INST_SHLADD;
1604	+	inst->operands[3].valid = true;
1605	+	inst->operands[3].index = -1;
1606	+	inst->operands[3].value = ia64_inst_get_count2(inst->inst);
1607	+	return true;
1608	+	case 0x9:
1609	+	if (x2b == 1) {
1610	+	inst->mnemo = IA64_INST_SUB;
1611	+	inst->operands[1].index = -1;
1612	+	inst->operands[1].value = ia64_inst_get_imm8(inst->inst);
1613	+	inst->operands[1].nat   = 0;
1614	+	return true;
1615	+	}
1616	+	break;
1617	+	case 0xb:
1618	+	inst->operands[1].index = -1;
1619	+	inst->operands[1].value = ia64_inst_get_imm8(inst->inst);
1620	+	inst->operands[1].nat   = 0;
1621	+	// fall-through
1622	+	case 0x3:
1623	+	switch (x2b) {
1624	+	case 0: inst->mnemo = IA64_INST_AND;   break;
1625	+	case 1: inst->mnemo = IA64_INST_ANDCM; break;
1626	+	case 2: inst->mnemo = IA64_INST_OR;    break;
1627	+	case 3: inst->mnemo = IA64_INST_XOR;   break;
1628	+	}
1629	+	return true;
1630	+	}
1631	+	}
1632	+	return false;
1633	+	}
1634	+
1635	+	// Decode instruction
1636	+	static bool ia64_decode_instruction(ia64_instruction_t *inst, IA64_CONTEXT_TYPE IA64_CONTEXT)
1637	+	{
1638	+	const int major = (inst->inst >> 37) & 0xf;
1639	+
1640	+	inst->mnemo = IA64_INST_UNKNOWN;
1641	+	inst->pred  = inst->inst & 0x3f;
1642	+	memset(&inst->operands[0], 0, sizeof(inst->operands));
1643	+
1644	+	switch (major) {
1645	+	case 0x0: return ia64_decode_instruction_0(inst, IA64_CONTEXT);
1646	+	case 0x4: return ia64_decode_instruction_4(inst, IA64_CONTEXT);
1647	+	case 0x5: return ia64_decode_instruction_5(inst, IA64_CONTEXT);
1648	+	case 0x8: return ia64_decode_instruction_8(inst, IA64_CONTEXT);
1649	+	}
1650	+	return false;
1651	+	}
1652	+
1653	+	static bool ia64_emulate_instruction(ia64_instruction_t *inst, IA64_CONTEXT_TYPE IA64_CONTEXT)
1654	+	{
1655	+	// XXX: handle Register NaT Consumption fault?
1656	+	// XXX: this simple emulator assumes instructions in a bundle
1657	+	// don't depend on effects of other instructions in the same
1658	+	// bundle. It probably would be simpler to JIT-generate code to be
1659	+	// executed natively but probably more costly (inject/extract CPU state)
1660	+	if (inst->mnemo == IA64_INST_UNKNOWN)
1661	+	return false;
1662	+	if (inst->pred && !IA64_GET_PR(inst->pred))
1663	+	return true;
1664	+
1665	+	unsigned char nat, nat2;
1666	+	unsigned long dst, dst2, src1, src2, src3;
1667	+
1668	+	switch (inst->mnemo) {
1669	+	case IA64_INST_NOP:
1670	+	break;
1671	+	case IA64_INST_ADD:
1672	+	case IA64_INST_SUB:
1673	+	case IA64_INST_SHLADD:
1674	+	src3 = inst->operands[3].value;
1675	+	// fall-through
1676	+	case IA64_INST_AND:
1677	+	case IA64_INST_ANDCM:
1678	+	case IA64_INST_OR:
1679	+	case IA64_INST_XOR:
1680	+	src1 = inst->operands[1].value;
1681	+	src2 = inst->operands[2].value;
1682	+	switch (inst->mnemo) {
1683	+	case IA64_INST_ADD:   dst = src1 + src2 + src3; break;
1684	+	case IA64_INST_SUB:   dst = src1 - src2 - src3; break;
1685	+	case IA64_INST_SHLADD: dst = (src1 << src3) + src2; break;
1686	+	case IA64_INST_AND:   dst = src1 & src2;                break;
1687	+	case IA64_INST_ANDCM: dst = src1 &~ src2;               break;
1688	+	case IA64_INST_OR:    dst = src1 | src2;                break;
1689	+	case IA64_INST_XOR:   dst = src1 ^ src2;                break;
1690	+	}
1691	+	inst->operands[0].commit = true;
1692	+	inst->operands[0].value  = dst;
1693	+	inst->operands[0].nat    = inst->operands[1].nat | inst->operands[2].nat;
1694	+	break;
1695	+	case IA64_INST_SXT1:
1696	+	case IA64_INST_SXT2:
1697	+	case IA64_INST_SXT4:
1698	+	case IA64_INST_ZXT1:
1699	+	case IA64_INST_ZXT2:
1700	+	case IA64_INST_ZXT4:
1701	+	src1 = inst->operands[1].value;
1702	+	switch (inst->mnemo) {
1703	+	case IA64_INST_SXT1: dst = (signed long)(signed char)src1;              break;
1704	+	case IA64_INST_SXT2: dst = (signed long)(signed short)src1;             break;
1705	+	case IA64_INST_SXT4: dst = (signed long)(signed int)src1;               break;
1706	+	case IA64_INST_ZXT1: dst = (unsigned char)src1;                                 break;
1707	+	case IA64_INST_ZXT2: dst = (unsigned short)src1;                                break;
1708	+	case IA64_INST_ZXT4: dst = (unsigned int)src1;                                  break;
1709	+	}
1710	+	inst->operands[0].commit = true;
1711	+	inst->operands[0].value  = dst;
1712	+	inst->operands[0].nat    = inst->operands[1].nat;
1713	+	break;
1714	+	case IA64_INST_LD1_UPDATE:
1715	+	case IA64_INST_LD2_UPDATE:
1716	+	case IA64_INST_LD4_UPDATE:
1717	+	case IA64_INST_LD8_UPDATE:
1718	+	inst->operands[1].commit = true;
1719	+	dst2 = inst->operands[1].value + inst->operands[2].value;
1720	+	nat2 = inst->operands[2].nat ? inst->operands[2].nat : 0;
1721	+	// fall-through
1722	+	case IA64_INST_LD1:
1723	+	case IA64_INST_LD2:
1724	+	case IA64_INST_LD4:
1725	+	case IA64_INST_LD8:
1726	+	src1 = inst->operands[1].value;
1727	+	if (inst->no_memory)
1728	+	dst = 0;
1729	+	else {
1730	+	switch (inst->mnemo) {
1731	+	case IA64_INST_LD1: case IA64_INST_LD1_UPDATE: dst = *((unsigned char *)src1);  break;
1732	+	case IA64_INST_LD2: case IA64_INST_LD2_UPDATE: dst = *((unsigned short *)src1); break;
1733	+	case IA64_INST_LD4: case IA64_INST_LD4_UPDATE: dst = *((unsigned int *)src1);   break;
1734	+	case IA64_INST_LD8: case IA64_INST_LD8_UPDATE: dst = *((unsigned long *)src1);  break;
1735	+	}
1736	+	}
1737	+	inst->operands[0].commit = true;
1738	+	inst->operands[0].value  = dst;
1739	+	inst->operands[0].nat    = 0;
1740	+	inst->operands[1].value  = dst2;
1741	+	inst->operands[1].nat    = nat2;
1742	+	break;
1743	+	case IA64_INST_ST1_UPDATE:
1744	+	case IA64_INST_ST2_UPDATE:
1745	+	case IA64_INST_ST4_UPDATE:
1746	+	case IA64_INST_ST8_UPDATE:
1747	+	inst->operands[0].commit = 0;
1748	+	dst2 = inst->operands[0].value + inst->operands[2].value;
1749	+	nat2 = inst->operands[2].nat ? inst->operands[2].nat : 0;
1750	+	// fall-through
1751	+	case IA64_INST_ST1:
1752	+	case IA64_INST_ST2:
1753	+	case IA64_INST_ST4:
1754	+	case IA64_INST_ST8:
1755	+	dst  = inst->operands[0].value;
1756	+	src1 = inst->operands[1].value;
1757	+	if (!inst->no_memory) {
1758	+	switch (inst->mnemo) {
1759	+	case IA64_INST_ST1: case IA64_INST_ST1_UPDATE: *((unsigned char *)dst) = src1;  break;
1760	+	case IA64_INST_ST2: case IA64_INST_ST2_UPDATE: *((unsigned short *)dst) = src1; break;
1761	+	case IA64_INST_ST4: case IA64_INST_ST4_UPDATE: *((unsigned int *)dst) = src1;   break;
1762	+	case IA64_INST_ST8: case IA64_INST_ST8_UPDATE: *((unsigned long *)dst) = src1;  break;
1763	+	}
1764	+	}
1765	+	inst->operands[0].value  = dst2;
1766	+	inst->operands[0].nat    = nat2;
1767	+	break;
1768	+	default:
1769	+	return false;
1770	+	}
1771	+
1772	+	for (int i = 0; i < IA64_N_OPERANDS; i++) {
1773	+	ia64_operand_t const & op = inst->operands[i];
1774	+	if (!op.commit)
1775	+	continue;
1776	+	if (op.index == -1)
1777	+	return false; // XXX: internal error
1778	+	IA64_SET_GR(op.index, op.value);
1779	+	IA64_SET_NAT(op.index, op.nat);
1780	+	}
1781	+	return true;
1782	+	}
1783	+
1784	+	static bool ia64_emulate_instruction(unsigned long raw_inst, IA64_CONTEXT_TYPE IA64_CONTEXT)
1785	+	{
1786	+	ia64_instruction_t inst;
1787	+	memset(&inst, 0, sizeof(inst));
1788	+	inst.inst = raw_inst;
1789	+	if (!ia64_decode_instruction(&inst, IA64_CONTEXT))
1790	+	return false;
1791	+	return ia64_emulate_instruction(&inst, IA64_CONTEXT);
1792	+	}
1793	+
1794	+	static bool ia64_skip_instruction(IA64_CONTEXT_TYPE IA64_CONTEXT)
1795	+	{
1796	+	unsigned long ip = IA64_GET_IP();
1797	+	#if DEBUG
1798	+	printf("IP: 0x%016lx\n", ip);
1799	+	#if 0
1800	+	printf(" Template 0x%02x\n", ia64_get_template(ip));
1801	+	ia64_get_instruction(ip, 0);
1802	+	ia64_get_instruction(ip, 1);
1803	+	ia64_get_instruction(ip, 2);
1804	+	#endif
1805	+	#endif
1806	+
1807	+	// Select which decode switch to use
1808	+	ia64_instruction_t inst;
1809	+	inst.inst = ia64_get_instruction(ip, ip & 3);
1810	+	if (!ia64_decode_instruction(&inst, IA64_CONTEXT)) {
1811	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): could not decode instruction\n");
1812	+	return false;
1813	+	}
1814	+
1815	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1816	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
1817	+
1818	+	switch (inst.mnemo) {
1819	+	case IA64_INST_LD1:
1820	+	case IA64_INST_LD2:
1821	+	case IA64_INST_LD4:
1822	+	case IA64_INST_LD8:
1823	+	case IA64_INST_LD1_UPDATE:
1824	+	case IA64_INST_LD2_UPDATE:
1825	+	case IA64_INST_LD4_UPDATE:
1826	+	case IA64_INST_LD8_UPDATE:
1827	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1828	+	break;
1829	+	case IA64_INST_ST1:
1830	+	case IA64_INST_ST2:
1831	+	case IA64_INST_ST4:
1832	+	case IA64_INST_ST8:
1833	+	case IA64_INST_ST1_UPDATE:
1834	+	case IA64_INST_ST2_UPDATE:
1835	+	case IA64_INST_ST4_UPDATE:
1836	+	case IA64_INST_ST8_UPDATE:
1837	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1838	+	break;
1839	+	}
1840	+
1841	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1842	+	// Unknown machine code, let it crash. Then patch the decoder
1843	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): not a load/store instruction\n");
1844	+	return false;
1845	+	}
1846	+
1847	+	switch (inst.mnemo) {
1848	+	case IA64_INST_LD1:
1849	+	case IA64_INST_LD1_UPDATE:
1850	+	case IA64_INST_ST1:
1851	+	case IA64_INST_ST1_UPDATE:
1852	+	transfer_size = SIZE_BYTE;
1853	+	break;
1854	+	case IA64_INST_LD2:
1855	+	case IA64_INST_LD2_UPDATE:
1856	+	case IA64_INST_ST2:
1857	+	case IA64_INST_ST2_UPDATE:
1858	+	transfer_size = SIZE_WORD;
1859	+	break;
1860	+	case IA64_INST_LD4:
1861	+	case IA64_INST_LD4_UPDATE:
1862	+	case IA64_INST_ST4:
1863	+	case IA64_INST_ST4_UPDATE:
1864	+	transfer_size = SIZE_LONG;
1865	+	break;
1866	+	case IA64_INST_LD8:
1867	+	case IA64_INST_LD8_UPDATE:
1868	+	case IA64_INST_ST8:
1869	+	case IA64_INST_ST8_UPDATE:
1870	+	transfer_size = SIZE_QUAD;
1871	+	break;
1872	+	}
1873	+
1874	+	if (transfer_size == SIZE_UNKNOWN) {
1875	+	// Unknown machine code, let it crash. Then patch the decoder
1876	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): unknown transfer size\n");
1877	+	return false;
1878	+	}
1879	+
1880	+	inst.no_memory = true;
1881	+	if (!ia64_emulate_instruction(&inst, IA64_CONTEXT)) {
1882	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): could not emulate fault instruction\n");
1883	+	return false;
1884	+	}
1885	+
1886	+	int slot = ip & 3;
1887	+	bool emulate_next = false;
1888	+	switch (slot) {
1889	+	case 0:
1890	+	switch (ia64_get_template(ip)) {
1891	+	case 0x2: // MI;I
1892	+	case 0x3: // MI;I;
1893	+	emulate_next = true;
1894	+	slot = 2;
1895	+	break;
1896	+	case 0xa: // M;MI
1897	+	case 0xb: // M;MI;
1898	+	emulate_next = true;
1899	+	slot = 1;
1900	+	break;
1901	+	}
1902	+	break;
1903	+	}
1904	+	if (emulate_next && !IA64_CAN_PATCH_IP_SLOT) {
1905	+	while (slot < 3) {
1906	+	if (!ia64_emulate_instruction(ia64_get_instruction(ip, slot), IA64_CONTEXT)) {
1907	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): could not emulate instruction\n");
1908	+	return false;
1909	+	}
1910	+	++slot;
1911	+	}
1912	+	}
1913	+
1914	+	#if IA64_CAN_PATCH_IP_SLOT
1915	+	if ((slot = ip & 3) < 2)
1916	+	IA64_SET_IP((ip & ~3ul) + (slot + 1));
1917	+	else
1918	+	#endif
1919	+	IA64_SET_IP((ip & ~3ul) + 16);
1920	+	#if DEBUG
1921	+	printf("IP: 0x%016lx\n", IA64_GET_IP());
1922	+	#endif
1923	+	return true;
1924	+	}
1925	+	#endif
1926	+
1927		// Decode and skip PPC instruction
1928	<	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
1929	<	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
1928	>	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__) || defined(__ppc64__))
1929	>	static bool powerpc_skip_instruction(unsigned long * nip_p, unsigned long * regs)
1930		{
1931		instruction_t instr;
1932		powerpc_decode_instruction(&instr, *nip_p, regs);
1933
1934	<	if (instr.transfer_type == TYPE_UNKNOWN) {
1934	>	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1935		// Unknown machine code, let it crash. Then patch the decoder
1936		return false;
1937		}
1938
1939		#if DEBUG
1940		printf("%08x: %s %s access", *nip_p,
1941	<	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
1942	<	instr.transfer_type == TYPE_LOAD ? "read" : "write");
1941	>	instr.transfer_size == SIZE_BYTE ? "byte" :
1942	>	instr.transfer_size == SIZE_WORD ? "word" :
1943	>	instr.transfer_size == SIZE_LONG ? "long" : "quad",
1944	>	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1945
1946		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1947		printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
1948	<	if (instr.transfer_type == TYPE_LOAD)
1948	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1949		printf(" r%d (rd = 0)\n", instr.rd);
1950		#endif
1951
1952		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1953		regs[instr.ra] = instr.addr;
1954	<	if (instr.transfer_type == TYPE_LOAD)
1954	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1955		regs[instr.rd] = 0;
1956
1957		*nip_p += 4;
1958		return true;
1959		}
1960		#endif
1961	+
1962	+	// Decode and skip MIPS instruction
1963	+	#if (defined(mips) || defined(__mips))
1964	+	static bool mips_skip_instruction(greg_t * pc_p, greg_t * regs)
1965	+	{
1966	+	unsigned int * epc = (unsigned int *)(unsigned long)*pc_p;
1967	+
1968	+	if (epc == 0)
1969	+	return false;
1970	+
1971	+	#if DEBUG
1972	+	printf("IP: %p [%08x]\n", epc, epc[0]);
1973	+	#endif
1974	+
1975	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1976	+	transfer_size_t transfer_size = SIZE_LONG;
1977	+	int direction = 0;
1978	+
1979	+	const unsigned int opcode = epc[0];
1980	+	switch (opcode >> 26) {
1981	+	case 32: // Load Byte
1982	+	case 36: // Load Byte Unsigned
1983	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1984	+	transfer_size = SIZE_BYTE;
1985	+	break;
1986	+	case 33: // Load Halfword
1987	+	case 37: // Load Halfword Unsigned
1988	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1989	+	transfer_size = SIZE_WORD;
1990	+	break;
1991	+	case 35: // Load Word
1992	+	case 39: // Load Word Unsigned
1993	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1994	+	transfer_size = SIZE_LONG;
1995	+	break;
1996	+	case 34: // Load Word Left
1997	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1998	+	transfer_size = SIZE_LONG;
1999	+	direction = -1;
2000	+	break;
2001	+	case 38: // Load Word Right
2002	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2003	+	transfer_size = SIZE_LONG;
2004	+	direction = 1;
2005	+	break;
2006	+	case 55: // Load Doubleword
2007	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2008	+	transfer_size = SIZE_QUAD;
2009	+	break;
2010	+	case 26: // Load Doubleword Left
2011	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2012	+	transfer_size = SIZE_QUAD;
2013	+	direction = -1;
2014	+	break;
2015	+	case 27: // Load Doubleword Right
2016	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2017	+	transfer_size = SIZE_QUAD;
2018	+	direction = 1;
2019	+	break;
2020	+	case 40: // Store Byte
2021	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2022	+	transfer_size = SIZE_BYTE;
2023	+	break;
2024	+	case 41: // Store Halfword
2025	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2026	+	transfer_size = SIZE_WORD;
2027	+	break;
2028	+	case 43: // Store Word
2029	+	case 42: // Store Word Left
2030	+	case 46: // Store Word Right
2031	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2032	+	transfer_size = SIZE_LONG;
2033	+	break;
2034	+	case 63: // Store Doubleword
2035	+	case 44: // Store Doubleword Left
2036	+	case 45: // Store Doubleword Right
2037	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2038	+	transfer_size = SIZE_QUAD;
2039	+	break;
2040	+	/* Misc instructions unlikely to be used within CPU emulators */
2041	+	case 48: // Load Linked Word
2042	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2043	+	transfer_size = SIZE_LONG;
2044	+	break;
2045	+	case 52: // Load Linked Doubleword
2046	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2047	+	transfer_size = SIZE_QUAD;
2048	+	break;
2049	+	case 56: // Store Conditional Word
2050	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2051	+	transfer_size = SIZE_LONG;
2052	+	break;
2053	+	case 60: // Store Conditional Doubleword
2054	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2055	+	transfer_size = SIZE_QUAD;
2056	+	break;
2057	+	}
2058	+
2059	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
2060	+	// Unknown machine code, let it crash. Then patch the decoder
2061	+	return false;
2062	+	}
2063	+
2064	+	// Zero target register in case of a load operation
2065	+	const int reg = (opcode >> 16) & 0x1f;
2066	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
2067	+	if (direction == 0)
2068	+	regs[reg] = 0;
2069	+	else {
2070	+	// FIXME: untested code
2071	+	unsigned long ea = regs[(opcode >> 21) & 0x1f];
2072	+	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
2073	+	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
2074	+	unsigned long value;
2075	+	if (direction > 0) {
2076	+	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
2077	+	value = regs[reg] & rmask;
2078	+	}
2079	+	else {
2080	+	const unsigned long lmask = (1L << (offset * 8)) - 1;
2081	+	value = regs[reg] & lmask;
2082	+	}
2083	+	// restore most significant bits
2084	+	if (transfer_size == SIZE_LONG)
2085	+	value = (signed long)(signed int)value;
2086	+	regs[reg] = value;
2087	+	}
2088	+	}
2089	+
2090	+	#if DEBUG
2091	+	#if (defined(_ABIN32) || defined(_ABI64))
2092	+	static const char * mips_gpr_names[32] = {
2093	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
2094	+	"t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
2095	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
2096	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
2097	+	};
2098	+	#else
2099	+	static const char * mips_gpr_names[32] = {
2100	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
2101	+	"a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
2102	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
2103	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
2104	+	};
2105	+	#endif
2106	+	printf("%s %s register %s\n",
2107	+	transfer_size == SIZE_BYTE ? "byte" :
2108	+	transfer_size == SIZE_WORD ? "word" :
2109	+	transfer_size == SIZE_LONG ? "long" :
2110	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
2111	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
2112	+	mips_gpr_names[reg]);
2113	+	#endif
2114	+
2115	+	*pc_p += 4;
2116	+	return true;
2117	+	}
2118	+	#endif
2119	+
2120	+	// Decode and skip SPARC instruction
2121	+	#if (defined(sparc) || defined(__sparc__))
2122	+	enum {
2123	+	#if (defined(__sun__))
2124	+	SPARC_REG_G1 = REG_G1,
2125	+	SPARC_REG_O0 = REG_O0,
2126	+	SPARC_REG_PC = REG_PC,
2127	+	SPARC_REG_nPC = REG_nPC
2128	+	#endif
2129	+	};
2130	+	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
2131	+	{
2132	+	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
2133	+
2134	+	if (pc == 0)
2135	+	return false;
2136	+
2137	+	#if DEBUG
2138	+	printf("IP: %p [%08x]\n", pc, pc[0]);
2139		#endif
2140
2141	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
2142	+	transfer_size_t transfer_size = SIZE_LONG;
2143	+	bool register_pair = false;
2144	+
2145	+	const unsigned int opcode = pc[0];
2146	+	if ((opcode >> 30) != 3)
2147	+	return false;
2148	+	switch ((opcode >> 19) & 0x3f) {
2149	+	case 9: // Load Signed Byte
2150	+	case 1: // Load Unsigned Byte
2151	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2152	+	transfer_size = SIZE_BYTE;
2153	+	break;
2154	+	case 10:// Load Signed Halfword
2155	+	case 2: // Load Unsigned Word
2156	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2157	+	transfer_size = SIZE_WORD;
2158	+	break;
2159	+	case 8: // Load Word
2160	+	case 0: // Load Unsigned Word
2161	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2162	+	transfer_size = SIZE_LONG;
2163	+	break;
2164	+	case 11:// Load Extended Word
2165	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2166	+	transfer_size = SIZE_QUAD;
2167	+	break;
2168	+	case 3: // Load Doubleword
2169	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2170	+	transfer_size = SIZE_LONG;
2171	+	register_pair = true;
2172	+	break;
2173	+	case 5: // Store Byte
2174	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2175	+	transfer_size = SIZE_BYTE;
2176	+	break;
2177	+	case 6: // Store Halfword
2178	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2179	+	transfer_size = SIZE_WORD;
2180	+	break;
2181	+	case 4: // Store Word
2182	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2183	+	transfer_size = SIZE_LONG;
2184	+	break;
2185	+	case 14:// Store Extended Word
2186	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2187	+	transfer_size = SIZE_QUAD;
2188	+	break;
2189	+	case 7: // Store Doubleword
2190	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2191	+	transfer_size = SIZE_LONG;
2192	+	register_pair = true;
2193	+	break;
2194	+	}
2195	+
2196	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
2197	+	// Unknown machine code, let it crash. Then patch the decoder
2198	+	return false;
2199	+	}
2200	+
2201	+	const int reg = (opcode >> 25) & 0x1f;
2202	+
2203	+	#if DEBUG
2204	+	static const char * reg_names[] = {
2205	+	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
2206	+	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
2207	+	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
2208	+	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
2209	+	};
2210	+	printf("%s %s register %s\n",
2211	+	transfer_size == SIZE_BYTE ? "byte" :
2212	+	transfer_size == SIZE_WORD ? "word" :
2213	+	transfer_size == SIZE_LONG ? "long" :
2214	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
2215	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
2216	+	reg_names[reg]);
2217	+	#endif
2218	+
2219	+	// Zero target register in case of a load operation
2220	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
2221	+	// FIXME: code to handle local & input registers is not tested
2222	+	if (reg >= 1 && reg < 8) {
2223	+	// global registers
2224	+	regs[reg - 1 + SPARC_REG_G1] = 0;
2225	+	}
2226	+	else if (reg >= 8 && reg < 16) {
2227	+	// output registers
2228	+	regs[reg - 8 + SPARC_REG_O0] = 0;
2229	+	}
2230	+	else if (reg >= 16 && reg < 24) {
2231	+	// local registers (in register windows)
2232	+	if (gwins)
2233	+	gwins->wbuf->rw_local[reg - 16] = 0;
2234	+	else
2235	+	rwin->rw_local[reg - 16] = 0;
2236	+	}
2237	+	else {
2238	+	// input registers (in register windows)
2239	+	if (gwins)
2240	+	gwins->wbuf->rw_in[reg - 24] = 0;
2241	+	else
2242	+	rwin->rw_in[reg - 24] = 0;
2243	+	}
2244	+	}
2245	+
2246	+	regs[SPARC_REG_PC] += 4;
2247	+	regs[SPARC_REG_nPC] += 4;
2248	+	return true;
2249	+	}
2250	+	#endif
2251	+	#endif
2252	+
2253	+	// Decode and skip ARM instruction
2254	+	#if (defined(arm) || defined(__arm__))
2255	+	enum {
2256	+	#if (defined(__linux__))
2257	+	ARM_REG_PC = 15,
2258	+	ARM_REG_CPSR = 16
2259	+	#endif
2260	+	};
2261	+	static bool arm_skip_instruction(unsigned long * regs)
2262	+	{
2263	+	unsigned int * pc = (unsigned int *)regs[ARM_REG_PC];
2264	+
2265	+	if (pc == 0)
2266	+	return false;
2267	+
2268	+	#if DEBUG
2269	+	printf("IP: %p [%08x]\n", pc, pc[0]);
2270	+	#endif
2271	+
2272	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
2273	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
2274	+	enum { op_sdt = 1, op_sdth = 2 };
2275	+	int op = 0;
2276	+
2277	+	// Handle load/store instructions only
2278	+	const unsigned int opcode = pc[0];
2279	+	switch ((opcode >> 25) & 7) {
2280	+	case 0: // Halfword and Signed Data Transfer (LDRH, STRH, LDRSB, LDRSH)
2281	+	op = op_sdth;
2282	+	// Determine transfer size (S/H bits)
2283	+	switch ((opcode >> 5) & 3) {
2284	+	case 0: // SWP instruction
2285	+	break;
2286	+	case 1: // Unsigned halfwords
2287	+	case 3: // Signed halfwords
2288	+	transfer_size = SIZE_WORD;
2289	+	break;
2290	+	case 2: // Signed byte
2291	+	transfer_size = SIZE_BYTE;
2292	+	break;
2293	+	}
2294	+	break;
2295	+	case 2:
2296	+	case 3: // Single Data Transfer (LDR, STR)
2297	+	op = op_sdt;
2298	+	// Determine transfer size (B bit)
2299	+	if (((opcode >> 22) & 1) == 1)
2300	+	transfer_size = SIZE_BYTE;
2301	+	else
2302	+	transfer_size = SIZE_LONG;
2303	+	break;
2304	+	default:
2305	+	// FIXME: support load/store mutliple?
2306	+	return false;
2307	+	}
2308	+
2309	+	// Check for invalid transfer size (SWP instruction?)
2310	+	if (transfer_size == SIZE_UNKNOWN)
2311	+	return false;
2312	+
2313	+	// Determine transfer type (L bit)
2314	+	if (((opcode >> 20) & 1) == 1)
2315	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2316	+	else
2317	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2318	+
2319	+	// Compute offset
2320	+	int offset;
2321	+	if (((opcode >> 25) & 1) == 0) {
2322	+	if (op == op_sdt)
2323	+	offset = opcode & 0xfff;
2324	+	else if (op == op_sdth) {
2325	+	int rm = opcode & 0xf;
2326	+	if (((opcode >> 22) & 1) == 0) {
2327	+	// register offset
2328	+	offset = regs[rm];
2329	+	}
2330	+	else {
2331	+	// immediate offset
2332	+	offset = ((opcode >> 4) & 0xf0) | (opcode & 0x0f);
2333	+	}
2334	+	}
2335	+	}
2336	+	else {
2337	+	const int rm = opcode & 0xf;
2338	+	const int sh = (opcode >> 7) & 0x1f;
2339	+	if (((opcode >> 4) & 1) == 1) {
2340	+	// we expect only legal load/store instructions
2341	+	printf("FATAL: invalid shift operand\n");
2342	+	return false;
2343	+	}
2344	+	const unsigned int v = regs[rm];
2345	+	switch ((opcode >> 5) & 3) {
2346	+	case 0: // logical shift left
2347	+	offset = sh ? v << sh : v;
2348	+	break;
2349	+	case 1: // logical shift right
2350	+	offset = sh ? v >> sh : 0;
2351	+	break;
2352	+	case 2: // arithmetic shift right
2353	+	if (sh)
2354	+	offset = ((signed int)v) >> sh;
2355	+	else
2356	+	offset = (v & 0x80000000) ? 0xffffffff : 0;
2357	+	break;
2358	+	case 3: // rotate right
2359	+	if (sh)
2360	+	offset = (v >> sh) | (v << (32 - sh));
2361	+	else
2362	+	offset = (v >> 1) | ((regs[ARM_REG_CPSR] << 2) & 0x80000000);
2363	+	break;
2364	+	}
2365	+	}
2366	+	if (((opcode >> 23) & 1) == 0)
2367	+	offset = -offset;
2368	+
2369	+	int rd = (opcode >> 12) & 0xf;
2370	+	int rn = (opcode >> 16) & 0xf;
2371	+	#if DEBUG
2372	+	static const char * reg_names[] = {
2373	+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
2374	+	"r9", "r9", "sl", "fp", "ip", "sp", "lr", "pc"
2375	+	};
2376	+	printf("%s %s register %s\n",
2377	+	transfer_size == SIZE_BYTE ? "byte" :
2378	+	transfer_size == SIZE_WORD ? "word" :
2379	+	transfer_size == SIZE_LONG ? "long" : "unknown",
2380	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
2381	+	reg_names[rd]);
2382	+	#endif
2383	+
2384	+	unsigned int base = regs[rn];
2385	+	if (((opcode >> 24) & 1) == 1)
2386	+	base += offset;
2387	+
2388	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD)
2389	+	regs[rd] = 0;
2390	+
2391	+	if (((opcode >> 24) & 1) == 0)                // post-index addressing
2392	+	regs[rn] += offset;
2393	+	else if (((opcode >> 21) & 1) == 1)   // write-back address into base
2394	+	regs[rn] = base;
2395	+
2396	+	regs[ARM_REG_PC] += 4;
2397	+	return true;
2398	+	}
2399	+	#endif
2400	+
2401	+
2402		// Fallbacks
2403	+	#ifndef SIGSEGV_FAULT_ADDRESS_FAST
2404	+	#define SIGSEGV_FAULT_ADDRESS_FAST              SIGSEGV_FAULT_ADDRESS
2405	+	#endif
2406	+	#ifndef SIGSEGV_FAULT_INSTRUCTION_FAST
2407	+	#define SIGSEGV_FAULT_INSTRUCTION_FAST  SIGSEGV_FAULT_INSTRUCTION
2408	+	#endif
2409		#ifndef SIGSEGV_FAULT_INSTRUCTION
2410	<	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
2410	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_ADDRESS
2411	>	#endif
2412	>	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
2413	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
2414	>	#endif
2415	>	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
2416	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(P) sigsegv_fault_handler(P)
2417		#endif
2418
2419		// SIGSEGV recovery supported ?
#	Line 581 | Line 2426 | static bool powerpc_skip_instruction(uns
2426		*  SIGSEGV global handler
2427		*/
2428
2429	+	struct sigsegv_info_t {
2430	+	sigsegv_address_t addr;
2431	+	sigsegv_address_t pc;
2432	+	#ifdef HAVE_MACH_EXCEPTIONS
2433	+	mach_port_t thread;
2434	+	bool has_exc_state;
2435	+	SIGSEGV_EXCEPTION_STATE_TYPE exc_state;
2436	+	mach_msg_type_number_t exc_state_count;
2437	+	bool has_thr_state;
2438	+	SIGSEGV_THREAD_STATE_TYPE thr_state;
2439	+	mach_msg_type_number_t thr_state_count;
2440	+	#endif
2441	+	};
2442	+
2443	+	#ifdef HAVE_MACH_EXCEPTIONS
2444	+	static void mach_get_exception_state(sigsegv_info_t *SIP)
2445	+	{
2446	+	SIP->exc_state_count = SIGSEGV_EXCEPTION_STATE_COUNT;
2447	+	kern_return_t krc = thread_get_state(SIP->thread,
2448	+	SIGSEGV_EXCEPTION_STATE_FLAVOR,
2449	+	(natural_t *)&SIP->exc_state,
2450	+	&SIP->exc_state_count);
2451	+	MACH_CHECK_ERROR(thread_get_state, krc);
2452	+	SIP->has_exc_state = true;
2453	+	}
2454	+
2455	+	static void mach_get_thread_state(sigsegv_info_t *SIP)
2456	+	{
2457	+	SIP->thr_state_count = SIGSEGV_THREAD_STATE_COUNT;
2458	+	kern_return_t krc = thread_get_state(SIP->thread,
2459	+	SIGSEGV_THREAD_STATE_FLAVOR,
2460	+	(natural_t *)&SIP->thr_state,
2461	+	&SIP->thr_state_count);
2462	+	MACH_CHECK_ERROR(thread_get_state, krc);
2463	+	SIP->has_thr_state = true;
2464	+	}
2465	+
2466	+	static void mach_set_thread_state(sigsegv_info_t *SIP)
2467	+	{
2468	+	kern_return_t krc = thread_set_state(SIP->thread,
2469	+	SIGSEGV_THREAD_STATE_FLAVOR,
2470	+	(natural_t *)&SIP->thr_state,
2471	+	SIP->thr_state_count);
2472	+	MACH_CHECK_ERROR(thread_set_state, krc);
2473	+	}
2474	+	#endif
2475	+
2476	+	// Return the address of the invalid memory reference
2477	+	sigsegv_address_t sigsegv_get_fault_address(sigsegv_info_t *SIP)
2478	+	{
2479	+	#ifdef HAVE_MACH_EXCEPTIONS
2480	+	static int use_fast_path = -1;
2481	+	if (use_fast_path != 1 && !SIP->has_exc_state) {
2482	+	mach_get_exception_state(SIP);
2483	+
2484	+	sigsegv_address_t addr = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
2485	+	if (use_fast_path < 0) {
2486	+	const char *machfault = getenv("SIGSEGV_MACH_FAULT");
2487	+	if (machfault) {
2488	+	if (strcmp(machfault, "fast") == 0)
2489	+	use_fast_path = 1;
2490	+	else if (strcmp(machfault, "slow") == 0)
2491	+	use_fast_path = 0;
2492	+	}
2493	+	if (use_fast_path < 0)
2494	+	use_fast_path = addr == SIP->addr;
2495	+	}
2496	+	SIP->addr = addr;
2497	+	}
2498	+	#endif
2499	+	return SIP->addr;
2500	+	}
2501	+
2502	+	// Return the address of the instruction that caused the fault, or
2503	+	// SIGSEGV_INVALID_ADDRESS if we could not retrieve this information
2504	+	sigsegv_address_t sigsegv_get_fault_instruction_address(sigsegv_info_t *SIP)
2505	+	{
2506	+	#ifdef HAVE_MACH_EXCEPTIONS
2507	+	if (!SIP->has_thr_state) {
2508	+	mach_get_thread_state(SIP);
2509	+
2510	+	SIP->pc = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
2511	+	}
2512	+	#endif
2513	+	return SIP->pc;
2514	+	}
2515	+
2516	+	// This function handles the badaccess to memory.
2517	+	// It is called from the signal handler or the exception handler.
2518	+	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
2519	+	{
2520	+	sigsegv_info_t SI;
2521	+	SI.addr = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS_FAST;
2522	+	SI.pc = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION_FAST;
2523	+	#ifdef HAVE_MACH_EXCEPTIONS
2524	+	SI.thread = thread;
2525	+	SI.has_exc_state = false;
2526	+	SI.has_thr_state = false;
2527	+	#endif
2528	+	sigsegv_info_t * const SIP = &SI;
2529	+
2530	+	// Call user's handler and reinstall the global handler, if required
2531	+	switch (SIGSEGV_FAULT_HANDLER_INVOKE(SIP)) {
2532	+	case SIGSEGV_RETURN_SUCCESS:
2533	+	return true;
2534	+
2535	+	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
2536	+	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
2537	+	// Call the instruction skipper with the register file
2538	+	// available
2539	+	#ifdef HAVE_MACH_EXCEPTIONS
2540	+	if (!SIP->has_thr_state)
2541	+	mach_get_thread_state(SIP);
2542	+	#endif
2543	+	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
2544	+	#ifdef HAVE_MACH_EXCEPTIONS
2545	+	// Unlike UNIX signals where the thread state
2546	+	// is modified off of the stack, in Mach we
2547	+	// need to actually call thread_set_state to
2548	+	// have the register values updated.
2549	+	mach_set_thread_state(SIP);
2550	+	#endif
2551	+	return true;
2552	+	}
2553	+	break;
2554	+	#endif
2555	+	case SIGSEGV_RETURN_FAILURE:
2556	+	// We can't do anything with the fault_address, dump state?
2557	+	if (sigsegv_state_dumper != 0)
2558	+	sigsegv_state_dumper(SIP);
2559	+	break;
2560	+	}
2561	+
2562	+	return false;
2563	+	}
2564	+
2565	+
2566	+	/*
2567	+	* There are two mechanisms for handling a bad memory access,
2568	+	* Mach exceptions and UNIX signals. The implementation specific
2569	+	* code appears below. Its reponsibility is to call handle_badaccess
2570	+	* which is the routine that handles the fault in an implementation
2571	+	* agnostic manner. The implementation specific code below is then
2572	+	* reponsible for checking whether handle_badaccess was able
2573	+	* to handle the memory access error and perform any implementation
2574	+	* specific tasks necessary afterwards.
2575	+	*/
2576	+
2577	+	#ifdef HAVE_MACH_EXCEPTIONS
2578	+	/*
2579	+	* We need to forward all exceptions that we do not handle.
2580	+	* This is important, there are many exceptions that may be
2581	+	* handled by other exception handlers. For example debuggers
2582	+	* use exceptions and the exception hander is in another
2583	+	* process in such a case. (Timothy J. Wood states in his
2584	+	* message to the list that he based this code on that from
2585	+	* gdb for Darwin.)
2586	+	*/
2587	+	static inline kern_return_t
2588	+	forward_exception(mach_port_t thread_port,
2589	+	mach_port_t task_port,
2590	+	exception_type_t exception_type,
2591	+	exception_data_t exception_data,
2592	+	mach_msg_type_number_t data_count,
2593	+	ExceptionPorts *oldExceptionPorts)
2594	+	{
2595	+	kern_return_t kret;
2596	+	unsigned int portIndex;
2597	+	mach_port_t port;
2598	+	exception_behavior_t behavior;
2599	+	thread_state_flavor_t flavor;
2600	+	thread_state_data_t thread_state;
2601	+	mach_msg_type_number_t thread_state_count;
2602	+
2603	+	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
2604	+	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
2605	+	// This handler wants the exception
2606	+	break;
2607	+	}
2608	+	}
2609	+
2610	+	if (portIndex >= oldExceptionPorts->maskCount) {
2611	+	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
2612	+	return KERN_FAILURE;
2613	+	}
2614	+
2615	+	port = oldExceptionPorts->handlers[portIndex];
2616	+	behavior = oldExceptionPorts->behaviors[portIndex];
2617	+	flavor = oldExceptionPorts->flavors[portIndex];
2618	+
2619	+	if (!VALID_THREAD_STATE_FLAVOR(flavor)) {
2620	+	fprintf(stderr, "Invalid thread_state flavor = %d. Not forwarding\n", flavor);
2621	+	return KERN_FAILURE;
2622	+	}
2623	+
2624	+	/*
2625	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
2626	+	*/
2627	+
2628	+	if (behavior != EXCEPTION_DEFAULT) {
2629	+	thread_state_count = THREAD_STATE_MAX;
2630	+	kret = thread_get_state (thread_port, flavor, (natural_t *)&thread_state,
2631	+	&thread_state_count);
2632	+	MACH_CHECK_ERROR (thread_get_state, kret);
2633	+	}
2634	+
2635	+	switch (behavior) {
2636	+	case EXCEPTION_DEFAULT:
2637	+	// fprintf(stderr, "forwarding to exception_raise\n");
2638	+	kret = exception_raise(port, thread_port, task_port, exception_type,
2639	+	exception_data, data_count);
2640	+	MACH_CHECK_ERROR (exception_raise, kret);
2641	+	break;
2642	+	case EXCEPTION_STATE:
2643	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
2644	+	kret = exception_raise_state(port, exception_type, exception_data,
2645	+	data_count, &flavor,
2646	+	(natural_t *)&thread_state, thread_state_count,
2647	+	(natural_t *)&thread_state, &thread_state_count);
2648	+	MACH_CHECK_ERROR (exception_raise_state, kret);
2649	+	break;
2650	+	case EXCEPTION_STATE_IDENTITY:
2651	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
2652	+	kret = exception_raise_state_identity(port, thread_port, task_port,
2653	+	exception_type, exception_data,
2654	+	data_count, &flavor,
2655	+	(natural_t *)&thread_state, thread_state_count,
2656	+	(natural_t *)&thread_state, &thread_state_count);
2657	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
2658	+	break;
2659	+	default:
2660	+	fprintf(stderr, "forward_exception got unknown behavior\n");
2661	+	kret = KERN_FAILURE;
2662	+	break;
2663	+	}
2664	+
2665	+	if (behavior != EXCEPTION_DEFAULT) {
2666	+	kret = thread_set_state (thread_port, flavor, (natural_t *)&thread_state,
2667	+	thread_state_count);
2668	+	MACH_CHECK_ERROR (thread_set_state, kret);
2669	+	}
2670	+
2671	+	return kret;
2672	+	}
2673	+
2674	+	/*
2675	+	* This is the code that actually handles the exception.
2676	+	* It is called by exc_server. For Darwin 5 Apple changed
2677	+	* this a bit from how this family of functions worked in
2678	+	* Mach. If you are familiar with that it is a little
2679	+	* different. The main variation that concerns us here is
2680	+	* that code is an array of exception specific codes and
2681	+	* codeCount is a count of the number of codes in the code
2682	+	* array. In typical Mach all exceptions have a code
2683	+	* and sub-code. It happens to be the case that for a
2684	+	* EXC_BAD_ACCESS exception the first entry is the type of
2685	+	* bad access that occurred and the second entry is the
2686	+	* faulting address so these entries correspond exactly to
2687	+	* how the code and sub-code are used on Mach.
2688	+	*
2689	+	* This is a MIG interface. No code in Basilisk II should
2690	+	* call this directley. This has to have external C
2691	+	* linkage because that is what exc_server expects.
2692	+	*/
2693	+	kern_return_t
2694	+	catch_exception_raise(mach_port_t exception_port,
2695	+	mach_port_t thread,
2696	+	mach_port_t task,
2697	+	exception_type_t exception,
2698	+	exception_data_t code,
2699	+	mach_msg_type_number_t code_count)
2700	+	{
2701	+	kern_return_t krc;
2702	+
2703	+	if (exception == EXC_BAD_ACCESS) {
2704	+	switch (code[0]) {
2705	+	case KERN_PROTECTION_FAILURE:
2706	+	case KERN_INVALID_ADDRESS:
2707	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
2708	+	return KERN_SUCCESS;
2709	+	break;
2710	+	}
2711	+	}
2712	+
2713	+	// In Mach we do not need to remove the exception handler.
2714	+	// If we forward the exception, eventually some exception handler
2715	+	// will take care of this exception.
2716	+	krc = forward_exception(thread, task, exception, code, code_count, &ports);
2717	+
2718	+	return krc;
2719	+	}
2720	+	#endif
2721	+
2722		#ifdef HAVE_SIGSEGV_RECOVERY
2723	+	// Handle bad memory accesses with signal handler
2724		static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
2725		{
2726	<	sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
2727	<	sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
589	<	bool fault_recovered = false;
590	<
591	<	// Call user's handler and reinstall the global handler, if required
592	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
2726	>	// Call handler and reinstall the global handler, if required
2727	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
2728		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
2729		sigsegv_do_install_handler(sig);
2730		#endif
2731	<	fault_recovered = true;
597	<	}
598	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
599	<	else if (sigsegv_ignore_fault) {
600	<	// Call the instruction skipper with the register file available
601	<	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
602	<	fault_recovered = true;
2731	>	return;
2732		}
604	–	#endif
2733
2734	<	if (!fault_recovered) {
607	<	// FAIL: reinstall default handler for "safe" crash
2734	>	// Failure: reinstall default handler for "safe" crash
2735		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
2736	<	SIGSEGV_ALL_SIGNALS
2736	>	SIGSEGV_ALL_SIGNALS
2737		#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	–	}
2738		}
2739		#endif
2740
#	Line 626 | Line 2748 | static bool sigsegv_do_install_handler(i
2748		{
2749		// Setup SIGSEGV handler to process writes to frame buffer
2750		#ifdef HAVE_SIGACTION
2751	<	struct sigaction vosf_sa;
2752	<	sigemptyset(&vosf_sa.sa_mask);
2753	<	vosf_sa.sa_sigaction = sigsegv_handler;
2754	<	vosf_sa.sa_flags = SA_SIGINFO;
2755	<	return (sigaction(sig, &vosf_sa, 0) == 0);
2751	>	struct sigaction sigsegv_sa;
2752	>	sigemptyset(&sigsegv_sa.sa_mask);
2753	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
2754	>	sigsegv_sa.sa_flags = SA_SIGINFO;
2755	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
2756		#else
2757		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
2758		#endif
#	Line 642 | Line 2764 | static bool sigsegv_do_install_handler(i
2764		{
2765		// Setup SIGSEGV handler to process writes to frame buffer
2766		#ifdef HAVE_SIGACTION
2767	<	struct sigaction vosf_sa;
2768	<	sigemptyset(&vosf_sa.sa_mask);
2769	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
2767	>	struct sigaction sigsegv_sa;
2768	>	sigemptyset(&sigsegv_sa.sa_mask);
2769	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
2770	>	sigsegv_sa.sa_flags = 0;
2771		#if !EMULATED_68K && defined(__NetBSD__)
2772	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
2773	<	vosf_sa.sa_flags = SA_ONSTACK;
651	<	#else
652	<	vosf_sa.sa_flags = 0;
2772	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
2773	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
2774		#endif
2775	<	return (sigaction(sig, &vosf_sa, 0) == 0);
2775	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
2776		#else
2777		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
2778		#endif
2779		}
2780		#endif
2781
2782	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
2782	>	#if defined(HAVE_MACH_EXCEPTIONS)
2783	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
2784		{
2785	<	#ifdef HAVE_SIGSEGV_RECOVERY
2785	>	/*
2786	>	* Except for the exception port functions, this should be
2787	>	* pretty much stock Mach. If later you choose to support
2788	>	* other Mach's besides Darwin, just check for __MACH__
2789	>	* here and __APPLE__ where the actual differences are.
2790	>	*/
2791	>	#if defined(__APPLE__) && defined(__MACH__)
2792	>	if (sigsegv_fault_handler != NULL) {
2793	>	sigsegv_fault_handler = handler;
2794	>	return true;
2795	>	}
2796	>
2797	>	kern_return_t krc;
2798	>
2799	>	// create the the exception port
2800	>	krc = mach_port_allocate(mach_task_self(),
2801	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
2802	>	if (krc != KERN_SUCCESS) {
2803	>	mach_error("mach_port_allocate", krc);
2804	>	return false;
2805	>	}
2806	>
2807	>	// add a port send right
2808	>	krc = mach_port_insert_right(mach_task_self(),
2809	>	_exceptionPort, _exceptionPort,
2810	>	MACH_MSG_TYPE_MAKE_SEND);
2811	>	if (krc != KERN_SUCCESS) {
2812	>	mach_error("mach_port_insert_right", krc);
2813	>	return false;
2814	>	}
2815	>
2816	>	// get the old exception ports
2817	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
2818	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
2819	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
2820	>	if (krc != KERN_SUCCESS) {
2821	>	mach_error("thread_get_exception_ports", krc);
2822	>	return false;
2823	>	}
2824	>
2825	>	// set the new exception port
2826	>	//
2827	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
2828	>	// EXCEPTION_DEFAULT to get the thread state in the initial
2829	>	// message, but it turns out that in the common case this is not
2830	>	// neccessary. If we need it we can later ask for it from the
2831	>	// suspended thread.
2832	>	//
2833	>	// Even with THREAD_STATE_NONE, Darwin provides the program
2834	>	// counter in the thread state.  The comments in the header file
2835	>	// seem to imply that you can count on the GPR's on an exception
2836	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
2837	>	// you have to ask for all of the GPR's anyway just to get the
2838	>	// program counter. In any case because of update effective
2839	>	// address from immediate and update address from effective
2840	>	// addresses of ra and rb modes (as good an name as any for these
2841	>	// addressing modes) used in PPC instructions, you will need the
2842	>	// GPR state anyway.
2843	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
2844	>	EXCEPTION_DEFAULT, SIGSEGV_THREAD_STATE_FLAVOR);
2845	>	if (krc != KERN_SUCCESS) {
2846	>	mach_error("thread_set_exception_ports", krc);
2847	>	return false;
2848	>	}
2849	>
2850	>	// create the exception handler thread
2851	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
2852	>	(void)fprintf(stderr, "creation of exception thread failed\n");
2853	>	return false;
2854	>	}
2855	>
2856	>	// do not care about the exception thread any longer, let is run standalone
2857	>	(void)pthread_detach(exc_thread);
2858	>
2859	>	sigsegv_fault_handler = handler;
2860	>	return true;
2861	>	#else
2862	>	return false;
2863	>	#endif
2864	>	}
2865	>	#endif
2866	>
2867	>	#ifdef HAVE_WIN32_EXCEPTIONS
2868	>	static LONG WINAPI main_exception_filter(EXCEPTION_POINTERS *ExceptionInfo)
2869	>	{
2870	>	if (sigsegv_fault_handler != NULL
2871	>	&& ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
2872	>	&& ExceptionInfo->ExceptionRecord->NumberParameters == 2
2873	>	&& handle_badaccess(ExceptionInfo))
2874	>	return EXCEPTION_CONTINUE_EXECUTION;
2875	>
2876	>	return EXCEPTION_CONTINUE_SEARCH;
2877	>	}
2878	>
2879	>	#if defined __CYGWIN__ && defined __i386__
2880	>	/* In Cygwin programs, SetUnhandledExceptionFilter has no effect because Cygwin
2881	>	installs a global exception handler.  We have to dig deep in order to install
2882	>	our main_exception_filter.  */
2883	>
2884	>	/* Data structures for the current thread's exception handler chain.
2885	>	On the x86 Windows uses register fs, offset 0 to point to the current
2886	>	exception handler; Cygwin mucks with it, so we must do the same... :-/ */
2887	>
2888	>	/* Magic taken from winsup/cygwin/include/exceptions.h.  */
2889	>
2890	>	struct exception_list {
2891	>	struct exception_list *prev;
2892	>	int (*handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
2893	>	};
2894	>	typedef struct exception_list exception_list;
2895	>
2896	>	/* Magic taken from winsup/cygwin/exceptions.cc.  */
2897	>
2898	>	__asm__ (".equ __except_list,0");
2899	>
2900	>	extern exception_list *_except_list __asm__ ("%fs:__except_list");
2901	>
2902	>	/* For debugging.  _except_list is not otherwise accessible from gdb.  */
2903	>	static exception_list *
2904	>	debug_get_except_list ()
2905	>	{
2906	>	return _except_list;
2907	>	}
2908	>
2909	>	/* Cygwin's original exception handler.  */
2910	>	static int (*cygwin_exception_handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
2911	>
2912	>	/* Our exception handler.  */
2913	>	static int
2914	>	libsigsegv_exception_handler (EXCEPTION_RECORD *exception, void *frame, CONTEXT *context, void *dispatch)
2915	>	{
2916	>	EXCEPTION_POINTERS ExceptionInfo;
2917	>	ExceptionInfo.ExceptionRecord = exception;
2918	>	ExceptionInfo.ContextRecord = context;
2919	>	if (main_exception_filter (&ExceptionInfo) == EXCEPTION_CONTINUE_SEARCH)
2920	>	return cygwin_exception_handler (exception, frame, context, dispatch);
2921	>	else
2922	>	return 0;
2923	>	}
2924	>
2925	>	static void
2926	>	do_install_main_exception_filter ()
2927	>	{
2928	>	/* We cannot insert any handler into the chain, because such handlers
2929	>	must lie on the stack (?).  Instead, we have to replace(!) Cygwin's
2930	>	global exception handler.  */
2931	>	cygwin_exception_handler = _except_list->handler;
2932	>	_except_list->handler = libsigsegv_exception_handler;
2933	>	}
2934	>
2935	>	#else
2936	>
2937	>	static void
2938	>	do_install_main_exception_filter ()
2939	>	{
2940	>	SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) &main_exception_filter);
2941	>	}
2942	>	#endif
2943	>
2944	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
2945	>	{
2946	>	static bool main_exception_filter_installed = false;
2947	>	if (!main_exception_filter_installed) {
2948	>	do_install_main_exception_filter();
2949	>	main_exception_filter_installed = true;
2950	>	}
2951		sigsegv_fault_handler = handler;
2952	+	return true;
2953	+	}
2954	+	#endif
2955	+
2956	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
2957	+	{
2958	+	#if defined(HAVE_SIGSEGV_RECOVERY)
2959		bool success = true;
2960		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
2961		SIGSEGV_ALL_SIGNALS
2962		#undef FAULT_HANDLER
2963	+	if (success)
2964	+	sigsegv_fault_handler = handler;
2965		return success;
2966	+	#elif defined(HAVE_MACH_EXCEPTIONS) || defined(HAVE_WIN32_EXCEPTIONS)
2967	+	return sigsegv_do_install_handler(handler);
2968		#else
2969		// FAIL: no siginfo_t nor sigcontext subterfuge is available
2970		return false;
#	Line 680 | Line 2978 | bool sigsegv_install_handler(sigsegv_fau
2978
2979		void sigsegv_deinstall_handler(void)
2980		{
2981	+	// We do nothing for Mach exceptions, the thread would need to be
2982	+	// suspended if not already so, and we might mess with other
2983	+	// exception handlers that came after we registered ours. There is
2984	+	// no need to remove the exception handler, in fact this function is
2985	+	// not called anywhere in Basilisk II.
2986		#ifdef HAVE_SIGSEGV_RECOVERY
2987		sigsegv_fault_handler = 0;
2988		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
2989		SIGSEGV_ALL_SIGNALS
2990		#undef FAULT_HANDLER
2991		#endif
2992	<	}
2993	<
2994	<
692	<	/*
693	<	*  SIGSEGV ignore state modifier
694	<	*/
695	<
696	<	void sigsegv_set_ignore_state(bool ignore_fault)
697	<	{
698	<	sigsegv_ignore_fault = ignore_fault;
2992	>	#ifdef HAVE_WIN32_EXCEPTIONS
2993	>	sigsegv_fault_handler = NULL;
2994	>	#endif
2995		}
2996
2997
#	Line 717 | Line 3013 | void sigsegv_set_dump_state(sigsegv_stat
3013		#include <stdio.h>
3014		#include <stdlib.h>
3015		#include <fcntl.h>
3016	+	#ifdef HAVE_SYS_MMAN_H
3017		#include <sys/mman.h>
3018	+	#endif
3019		#include "vm_alloc.h"
3020
3021	<	static int page_size;
3021	>	const int REF_INDEX = 123;
3022	>	const int REF_VALUE = 45;
3023	>
3024	>	static sigsegv_uintptr_t page_size;
3025		static volatile char * page = 0;
3026		static volatile int handler_called = 0;
3027
3028	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
3028	>	/* Barriers */
3029	>	#ifdef __GNUC__
3030	>	#define BARRIER() asm volatile ("" : : : "memory")
3031	>	#else
3032	>	#define BARRIER() /* nothing */
3033	>	#endif
3034	>
3035	>	#ifdef __GNUC__
3036	>	// Code range where we expect the fault to come from
3037	>	static void *b_region, *e_region;
3038	>	#endif
3039	>
3040	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_info_t *sip)
3041		{
3042	+	const sigsegv_address_t fault_address = sigsegv_get_fault_address(sip);
3043	+	const sigsegv_address_t instruction_address = sigsegv_get_fault_instruction_address(sip);
3044	+	#if DEBUG
3045	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
3046	+	printf("expected fault at %p\n", page + REF_INDEX);
3047	+	#ifdef __GNUC__
3048	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
3049	+	#endif
3050	+	#endif
3051		handler_called++;
3052	<	if ((fault_address - 123) != page)
3053	<	exit(1);
3054	<	if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
3055	<	exit(1);
3056	<	return true;
3052	>	if ((fault_address - REF_INDEX) != page)
3053	>	exit(10);
3054	>	#ifdef __GNUC__
3055	>	// Make sure reported fault instruction address falls into
3056	>	// expected code range
3057	>	if (instruction_address != SIGSEGV_INVALID_ADDRESS
3058	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
3059	>	(instruction_address >= (sigsegv_address_t)e_region)))
3060	>	exit(11);
3061	>	#endif
3062	>	if (vm_protect((char *)((sigsegv_uintptr_t)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
3063	>	exit(12);
3064	>	return SIGSEGV_RETURN_SUCCESS;
3065		}
3066
3067		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
3068	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
3068	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_info_t *sip)
3069		{
3070	<	return false;
3070	>	const sigsegv_address_t fault_address = sigsegv_get_fault_address(sip);
3071	>	const sigsegv_address_t instruction_address = sigsegv_get_fault_instruction_address(sip);
3072	>	#if DEBUG
3073	>	printf("sigsegv_insn_handler(%p, %p)\n", fault_address, instruction_address);
3074	>	#endif
3075	>	if (((sigsegv_uintptr_t)fault_address - (sigsegv_uintptr_t)page) < page_size) {
3076	>	#ifdef __GNUC__
3077	>	// Make sure reported fault instruction address falls into
3078	>	// expected code range
3079	>	if (instruction_address != SIGSEGV_INVALID_ADDRESS
3080	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
3081	>	(instruction_address >= (sigsegv_address_t)e_region)))
3082	>	return SIGSEGV_RETURN_FAILURE;
3083	>	#endif
3084	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
3085	>	}
3086	>
3087	>	return SIGSEGV_RETURN_FAILURE;
3088	>	}
3089	>
3090	>	// More sophisticated tests for instruction skipper
3091	>	static bool arch_insn_skipper_tests()
3092	>	{
3093	>	#if (defined(i386) || defined(__i386__)) || (defined(__x86_64__) || defined(_M_X64))
3094	>	static const unsigned char code[] = {
3095	>	0x8a, 0x00,                    // mov    (%eax),%al
3096	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
3097	>	0x88, 0x20,                    // mov    %ah,(%eax)
3098	>	0x88, 0x08,                    // mov    %cl,(%eax)
3099	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
3100	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
3101	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
3102	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
3103	>	0x8b, 0x00,                    // mov    (%eax),%eax
3104	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
3105	>	0x89, 0x00,                    // mov    %eax,(%eax)
3106	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
3107	>	#if defined(__x86_64__) || defined(_M_X64)
3108	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
3109	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
3110	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
3111	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
3112	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
3113	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
3114	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
3115	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
3116	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
3117	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
3118	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
3119	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
3120	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
3121	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
3122	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
3123	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
3124	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
3125	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
3126	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
3127	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
3128	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
3129	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
3130	>	0x63, 0x47, 0x04,              // movslq 4(%rdi),%eax
3131	>	0x48, 0x63, 0x47, 0x04,        // movslq 4(%rdi),%rax
3132	>	#endif
3133	>	0                              // end
3134	>	};
3135	>	const int N_REGS = 20;
3136	>	SIGSEGV_REGISTER_TYPE regs[N_REGS];
3137	>	for (int i = 0; i < N_REGS; i++)
3138	>	regs[i] = i;
3139	>	const sigsegv_uintptr_t start_code = (sigsegv_uintptr_t)&code;
3140	>	regs[X86_REG_EIP] = start_code;
3141	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
3142	>	&& ix86_skip_instruction(regs))
3143	>	; /* simply iterate */
3144	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
3145	>	#endif
3146	>	return true;
3147		}
3148		#endif
3149
#	Line 746 | Line 3152 | int main(void)
3152		if (vm_init() < 0)
3153		return 1;
3154
3155	<	page_size = getpagesize();
3155	>	page_size = vm_get_page_size();
3156		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
3157	<	return 1;
3157	>	return 2;
3158
3159	+	memset((void *)page, 0, page_size);
3160		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
3161	<	return 1;
3161	>	return 3;
3162
3163		if (!sigsegv_install_handler(sigsegv_test_handler))
3164	<	return 1;
3165	<
3166	<	page[123] = 45;
3167	<	page[123] = 45;
3168	<
3164	>	return 4;
3165	>
3166	>	#ifdef __GNUC__
3167	>	b_region = &&L_b_region1;
3168	>	e_region = &&L_e_region1;
3169	>	#endif
3170	>	/* This is a really awful hack but otherwise gcc is smart enough
3171	>	* (or bug'ous enough?) to optimize the labels and place them
3172	>	* e.g. at the "main" entry point, which is wrong.
3173	>	*/
3174	>	volatile int label_hack = 1;
3175	>	switch (label_hack) {
3176	>	case 1:
3177	>	L_b_region1:
3178	>	page[REF_INDEX] = REF_VALUE;
3179	>	if (page[REF_INDEX] != REF_VALUE)
3180	>	exit(20);
3181	>	page[REF_INDEX] = REF_VALUE;
3182	>	BARRIER();
3183	>	// fall-through
3184	>	case 2:
3185	>	L_e_region1:
3186	>	BARRIER();
3187	>	break;
3188	>	}
3189	>
3190		if (handler_called != 1)
3191	<	return 1;
3191	>	return 5;
3192
3193		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
3194		if (!sigsegv_install_handler(sigsegv_insn_handler))
3195	<	return 1;
3195	>	return 6;
3196
3197	<	if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0)
3198	<	return 1;
3197	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
3198	>	return 7;
3199
3200		for (int i = 0; i < page_size; i++)
3201		page[i] = (i + 1) % page_size;
3202
3203		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
3204	<	return 1;
3204	>	return 8;
3205
778	–	sigsegv_set_ignore_state(true);
779	–
3206		#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
3207	<	const unsigned int TAG = 0x12345678;                    \
3207	>	const unsigned long TAG = 0x12345678 |                  \
3208	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
3209		TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
3210	<	volatile unsigned int effect = data + TAG;              \
3210	>	volatile unsigned long effect = data + TAG;             \
3211		if (effect != TAG)                                                              \
3212	<	return 1;                                                                       \
3212	>	return 9;                                                                       \
3213		} while (0)
3214
3215	<	TEST_SKIP_INSTRUCTION(unsigned char);
3216	<	TEST_SKIP_INSTRUCTION(unsigned short);
3217	<	TEST_SKIP_INSTRUCTION(unsigned int);
3215	>	#ifdef __GNUC__
3216	>	b_region = &&L_b_region2;
3217	>	e_region = &&L_e_region2;
3218	>	#endif
3219	>	switch (label_hack) {
3220	>	case 1:
3221	>	L_b_region2:
3222	>	TEST_SKIP_INSTRUCTION(unsigned char);
3223	>	TEST_SKIP_INSTRUCTION(unsigned short);
3224	>	TEST_SKIP_INSTRUCTION(unsigned int);
3225	>	TEST_SKIP_INSTRUCTION(unsigned long);
3226	>	TEST_SKIP_INSTRUCTION(signed char);
3227	>	TEST_SKIP_INSTRUCTION(signed short);
3228	>	TEST_SKIP_INSTRUCTION(signed int);
3229	>	TEST_SKIP_INSTRUCTION(signed long);
3230	>	BARRIER();
3231	>	// fall-through
3232	>	case 2:
3233	>	L_e_region2:
3234	>	BARRIER();
3235	>	break;
3236	>	}
3237	>	if (!arch_insn_skipper_tests())
3238	>	return 20;
3239		#endif
3240
3241		vm_exit();

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