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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.21 by gbeauche, 2002-10-03T15:49:14Z vs.
Revision 1.75 by gbeauche, 2008-01-06T16:25:03Z

#	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
#	Line 40 | Line 52
52		// Type of the system signal handler
53		typedef RETSIGTYPE (*signal_handler)(int);
54
43	–	// Is the fault to be ignored?
44	–	static bool sigsegv_ignore_fault = false;
45	–
55		// User's SIGSEGV handler
56		static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
57
#	Line 59 | Line 68 | static bool sigsegv_do_install_handler(i
68
69		// Transfer type
70		enum transfer_type_t {
71	<	TYPE_UNKNOWN,
72	<	TYPE_LOAD,
73	<	TYPE_STORE
71	>	SIGSEGV_TRANSFER_UNKNOWN        = 0,
72	>	SIGSEGV_TRANSFER_LOAD           = 1,
73	>	SIGSEGV_TRANSFER_STORE          = 2
74		};
75
76		// Transfer size
77		enum transfer_size_t {
78		SIZE_UNKNOWN,
79		SIZE_BYTE,
80	<	SIZE_WORD,
81	<	SIZE_LONG
80	>	SIZE_WORD, // 2 bytes
81	>	SIZE_LONG, // 4 bytes
82	>	SIZE_QUAD  // 8 bytes
83		};
84
85	<	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
85	>	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__) || defined(__ppc64__))
86		// Addressing mode
87		enum addressing_mode_t {
88		MODE_UNKNOWN,
#	Line 91 | Line 101 | struct instruction_t {
101		char                            ra, rd;
102		};
103
104	<	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned int * gpr)
104	>	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned long * gpr)
105		{
106		// Get opcode and divide into fields
107	<	unsigned int opcode = *((unsigned int *)nip);
107	>	unsigned int opcode = *((unsigned int *)(unsigned long)nip);
108		unsigned int primop = opcode >> 26;
109		unsigned int exop = (opcode >> 1) & 0x3ff;
110		unsigned int ra = (opcode >> 16) & 0x1f;
#	Line 103 | Line 113 | static void powerpc_decode_instruction(i
113		signed int imm = (signed short)(opcode & 0xffff);
114
115		// Analyze opcode
116	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
116	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
117		transfer_size_t transfer_size = SIZE_UNKNOWN;
118		addressing_mode_t addr_mode = MODE_UNKNOWN;
119		switch (primop) {
120		case 31:
121		switch (exop) {
122		case 23:        // lwzx
123	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
123	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
124		case 55:        // lwzux
125	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
125	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
126		case 87:        // lbzx
127	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
127	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
128		case 119:       // lbzux
129	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
129	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
130		case 151:       // stwx
131	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
131	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
132		case 183:       // stwux
133	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
133	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
134		case 215:       // stbx
135	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
135	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
136		case 247:       // stbux
137	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
137	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
138		case 279:       // lhzx
139	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
139	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
140		case 311:       // lhzux
141	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
141	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
142		case 343:       // lhax
143	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
143	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
144		case 375:       // lhaux
145	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
145	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
146		case 407:       // sthx
147	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
147	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
148		case 439:       // sthux
149	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
149	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
150		}
151		break;
152
153		case 32:        // lwz
154	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
154	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
155		case 33:        // lwzu
156	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
156	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
157		case 34:        // lbz
158	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
158	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
159		case 35:        // lbzu
160	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
160	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
161		case 36:        // stw
162	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
162	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
163		case 37:        // stwu
164	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
164	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
165		case 38:        // stb
166	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
166	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
167		case 39:        // stbu
168	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
168	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
169		case 40:        // lhz
170	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
170	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
171		case 41:        // lhzu
172	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
172	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
173		case 42:        // lha
174	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
174	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
175		case 43:        // lhau
176	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
176	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
177		case 44:        // sth
178	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
178	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
179		case 45:        // sthu
180	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
180	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
181	>	case 58:        // ld, ldu, lwa
182	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
183	>	transfer_size = SIZE_QUAD;
184	>	addr_mode = ((opcode & 3) == 1) ? MODE_U : MODE_NORM;
185	>	imm &= ~3;
186	>	break;
187	>	case 62:        // std, stdu, stq
188	>	transfer_type = SIGSEGV_TRANSFER_STORE;
189	>	transfer_size = SIZE_QUAD;
190	>	addr_mode = ((opcode & 3) == 1) ? MODE_U : MODE_NORM;
191	>	imm &= ~3;
192	>	break;
193		}
194
195		// Calculate effective address
#	Line 208 | Line 230 | static void powerpc_decode_instruction(i
230
231		#if HAVE_SIGINFO_T
232		// Generic extended signal handler
233	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
233	>	#if defined(__FreeBSD__)
234		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
235		#else
236		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
237		#endif
238		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
239	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t *sip, void *scp
240	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sip, scp
241		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
242	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
242	>	#if (defined(sgi) || defined(__sgi))
243	>	#include <ucontext.h>
244	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
245	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)SIGSEGV_CONTEXT_REGS[CTX_EPC]
246	>	#if (defined(mips) || defined(__mips))
247	>	#define SIGSEGV_REGISTER_FILE                   &SIGSEGV_CONTEXT_REGS[CTX_EPC], &SIGSEGV_CONTEXT_REGS[CTX_R0]
248	>	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
249	>	#endif
250	>	#endif
251	>	#if defined(__sun__)
252	>	#if (defined(sparc) || defined(__sparc__))
253	>	#include <sys/stack.h>
254	>	#include <sys/regset.h>
255	>	#include <sys/ucontext.h>
256	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
257	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[REG_PC]
258	>	#define SIGSEGV_SPARC_GWINDOWS                  (((ucontext_t *)scp)->uc_mcontext.gwins)
259	>	#define SIGSEGV_SPARC_RWINDOW                   (struct rwindow *)((char *)SIGSEGV_CONTEXT_REGS[REG_SP] + STACK_BIAS)
260	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)SIGSEGV_CONTEXT_REGS), SIGSEGV_SPARC_GWINDOWS, SIGSEGV_SPARC_RWINDOW
261	>	#define SIGSEGV_SKIP_INSTRUCTION                sparc_skip_instruction
262	>	#endif
263	>	#if defined(__i386__)
264	>	#include <sys/regset.h>
265	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
266	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[EIP]
267	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
268	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
269	>	#endif
270	>	#endif
271	>	#if defined(__FreeBSD__) || defined(__OpenBSD__)
272		#if (defined(i386) || defined(__i386__))
273		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
274	<	#define SIGSEGV_REGISTER_FILE                   ((unsigned int *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
274	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
275		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
276		#endif
277		#endif
278	+	#if defined(__NetBSD__)
279	+	#if (defined(i386) || defined(__i386__))
280	+	#include <sys/ucontext.h>
281	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.__gregs)
282	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[_REG_EIP]
283	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
284	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
285	+	#endif
286	+	#if (defined(powerpc) || defined(__powerpc__))
287	+	#include <sys/ucontext.h>
288	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.__gregs)
289	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[_REG_PC]
290	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS[_REG_PC], (unsigned long *)&SIGSEGV_CONTEXT_REGS[_REG_R0]
291	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
292	+	#endif
293	+	#endif
294		#if defined(__linux__)
295		#if (defined(i386) || defined(__i386__))
296		#include <sys/ucontext.h>
297		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
298		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
299	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)SIGSEGV_CONTEXT_REGS
299	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
300		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
301		#endif
302		#if (defined(x86_64) || defined(__x86_64__))
#	Line 235 | Line 304 | static void powerpc_decode_instruction(i
304		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
305		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
306		#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
307	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
308		#endif
309		#if (defined(ia64) || defined(__ia64__))
310	<	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
310	>	#define SIGSEGV_CONTEXT_REGS                    ((struct sigcontext *)scp)
311	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
312	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
313	>	#define SIGSEGV_SKIP_INSTRUCTION                ia64_skip_instruction
314		#endif
315		#if (defined(powerpc) || defined(__powerpc__))
316		#include <sys/ucontext.h>
317		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
318		#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
319	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
319	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned long *)(SIGSEGV_CONTEXT_REGS->gpr)
320		#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
321		#endif
322	+	#if (defined(hppa) || defined(__hppa__))
323	+	#undef  SIGSEGV_FAULT_ADDRESS
324	+	#define SIGSEGV_FAULT_ADDRESS                   sip->si_ptr
325	+	#endif
326	+	#if (defined(arm) || defined(__arm__))
327	+	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
328	+	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
329	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.arm_pc)
330	+	#define SIGSEGV_REGISTER_FILE                   (&SIGSEGV_CONTEXT_REGS.arm_r0)
331	+	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
332	+	#endif
333	+	#if (defined(mips) || defined(__mips__))
334	+	#include <sys/ucontext.h>
335	+	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
336	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.pc)
337	+	#define SIGSEGV_REGISTER_FILE                   &SIGSEGV_CONTEXT_REGS.pc, &SIGSEGV_CONTEXT_REGS.gregs[0]
338	+	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
339	+	#endif
340		#endif
341		#endif
342
#	Line 256 | Line 347 | static void powerpc_decode_instruction(i
347		#if (defined(i386) || defined(__i386__))
348		#include <asm/sigcontext.h>
349		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
350	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
351	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
352	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)(&scs)
350	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
351	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
352	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
353	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
354	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
355		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
356		#endif
357		#if (defined(sparc) || defined(__sparc__))
358		#include <asm/sigcontext.h>
359		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
360	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
361		#define SIGSEGV_FAULT_ADDRESS                   addr
362		#endif
363		#if (defined(powerpc) || defined(__powerpc__))
364		#include <asm/sigcontext.h>
365		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
366	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
367		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
368		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
369	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
369	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&scp->regs->nip, (unsigned long *)(scp->regs->gpr)
370		#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
371		#endif
372		#if (defined(alpha) || defined(__alpha__))
373		#include <asm/sigcontext.h>
374		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
375	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
376		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
377		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
378	<
379	<	// From Boehm's GC 6.0alpha8
380	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
381	<	{
382	<	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
383	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
384	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
385	<	return (sigsegv_address_t)fault_address;
386	<	}
378	>	#endif
379	>	#if (defined(arm) || defined(__arm__))
380	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int r1, int r2, int r3, struct sigcontext sc
381	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
382	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &sc
383	>	#define SIGSEGV_FAULT_ADDRESS                   scp->fault_address
384	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->arm_pc
385	>	#define SIGSEGV_REGISTER_FILE                   &scp->arm_r0
386	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
387		#endif
388		#endif
389
390		// Irix 5 or 6 on MIPS
391	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
391	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
392		#include <ucontext.h>
393		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
394	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
394	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
395	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
396	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
397		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
398		#endif
399
400		// HP-UX
401		#if (defined(hpux) || defined(__hpux__))
402		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
403	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
404		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
405		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
406		#endif
#	Line 310 | Line 409 | static sigsegv_address_t get_fault_addre
409		#if defined(__osf__)
410		#include <ucontext.h>
411		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
412	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
413		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
414		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
415		#endif
#	Line 317 | Line 417 | static sigsegv_address_t get_fault_addre
417		// AIX
418		#if defined(_AIX)
419		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
420	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
421		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
422		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
423		#endif
424
425	<	// NetBSD or FreeBSD
426	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
425	>	// NetBSD
426	>	#if defined(__NetBSD__)
427		#if (defined(m68k) || defined(__m68k__))
428		#include <m68k/frame.h>
429		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
430	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
431		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
432		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
433
#	Line 349 | Line 451 | static sigsegv_address_t get_fault_addre
451		}
452		return (sigsegv_address_t)fault_addr;
453		}
454	<	#else
455	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
456	<	#define SIGSEGV_FAULT_ADDRESS                   addr
454	>	#endif
455	>	#if (defined(alpha) || defined(__alpha__))
456	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
457	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
458	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
459		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
460		#endif
461	+	#if (defined(i386) || defined(__i386__))
462	+	#error "FIXME: need to decode instruction and compute EA"
463	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
464	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
465	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
466	+	#endif
467	+	#endif
468	+	#if defined(__FreeBSD__)
469	+	#if (defined(i386) || defined(__i386__))
470	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
471	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
472	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
473	+	#define SIGSEGV_FAULT_ADDRESS                   addr
474	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
475	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
476	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
477		#endif
478	+	#if (defined(alpha) || defined(__alpha__))
479	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
480	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, char *addr, struct sigcontext *scp
481	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, addr, scp
482	+	#define SIGSEGV_FAULT_ADDRESS                   addr
483	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
484	+	#endif
485	+	#endif
486	+
487	+	// Extract fault address out of a sigcontext
488	+	#if (defined(alpha) || defined(__alpha__))
489	+	// From Boehm's GC 6.0alpha8
490	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
491	+	{
492	+	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
493	+	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
494	+	fault_address += (signed long)(signed short)(instruction & 0xffff);
495	+	return (sigsegv_address_t)fault_address;
496	+	}
497	+	#endif
498	+
499
500	<	// MacOS X
500	>	// MacOS X, not sure which version this works in. Under 10.1
501	>	// vm_protect does not appear to work from a signal handler. Under
502	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
503	>	// field is the address of the faulting instruction and not the
504	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
505	>	// case with Mach exception handlers there is a way to do what this
506	>	// was meant to do.
507	>	#ifndef HAVE_MACH_EXCEPTIONS
508		#if defined(__APPLE__) && defined(__MACH__)
509		#if (defined(ppc) || defined(__ppc__))
510		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
511	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
512		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
513		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
514		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
#	Line 379 | Line 528 | static sigsegv_address_t get_fault_addre
528		#endif
529		#endif
530		#endif
531	+	#endif
532	+
533	+	#if HAVE_WIN32_EXCEPTIONS
534	+	#define WIN32_LEAN_AND_MEAN /* avoid including junk */
535	+	#include <windows.h>
536	+	#include <winerror.h>
537	+
538	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   EXCEPTION_POINTERS *ExceptionInfo
539	+	#define SIGSEGV_FAULT_HANDLER_ARGS              ExceptionInfo
540	+	#define SIGSEGV_FAULT_ADDRESS                   ExceptionInfo->ExceptionRecord->ExceptionInformation[1]
541	+	#define SIGSEGV_CONTEXT_REGS                    ExceptionInfo->ContextRecord
542	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS->Eip
543	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&SIGSEGV_CONTEXT_REGS->Edi)
544	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
545	+	#endif
546	+
547	+	#if HAVE_MACH_EXCEPTIONS
548	+
549	+	// This can easily be extended to other Mach systems, but really who
550	+	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
551	+	// Mach 2.5/3.0?
552	+	#if defined(__APPLE__) && defined(__MACH__)
553	+
554	+	#include <sys/types.h>
555	+	#include <stdlib.h>
556	+	#include <stdio.h>
557	+	#include <pthread.h>
558	+
559	+	/*
560	+	* If you are familiar with MIG then you will understand the frustration
561	+	* that was necessary to get these embedded into C++ code by hand.
562	+	*/
563	+	extern "C" {
564	+	#include <mach/mach.h>
565	+	#include <mach/mach_error.h>
566	+
567	+	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
568	+	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
569	+	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
570	+	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
571	+	exception_type_t, exception_data_t, mach_msg_type_number_t);
572	+	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
573	+	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
574	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
575	+	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
576	+	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
577	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
578	+	}
579	+
580	+	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
581	+	#define HANDLER_COUNT 64
582	+
583	+	// structure to tuck away existing exception handlers
584	+	typedef struct _ExceptionPorts {
585	+	mach_msg_type_number_t maskCount;
586	+	exception_mask_t masks[HANDLER_COUNT];
587	+	exception_handler_t handlers[HANDLER_COUNT];
588	+	exception_behavior_t behaviors[HANDLER_COUNT];
589	+	thread_state_flavor_t flavors[HANDLER_COUNT];
590	+	} ExceptionPorts;
591	+
592	+	// exception handler thread
593	+	static pthread_t exc_thread;
594	+
595	+	// place where old exception handler info is stored
596	+	static ExceptionPorts ports;
597	+
598	+	// our exception port
599	+	static mach_port_t _exceptionPort = MACH_PORT_NULL;
600	+
601	+	#define MACH_CHECK_ERROR(name,ret) \
602	+	if (ret != KERN_SUCCESS) { \
603	+	mach_error(#name, ret); \
604	+	exit (1); \
605	+	}
606	+
607	+	#ifdef __ppc__
608	+	#define SIGSEGV_EXCEPTION_STATE_TYPE    ppc_exception_state_t
609	+	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  PPC_EXCEPTION_STATE
610	+	#define SIGSEGV_EXCEPTION_STATE_COUNT   PPC_EXCEPTION_STATE_COUNT
611	+	#define SIGSEGV_FAULT_ADDRESS                   SIP->exc_state.dar
612	+	#define SIGSEGV_THREAD_STATE_TYPE               ppc_thread_state_t
613	+	#define SIGSEGV_THREAD_STATE_FLAVOR             PPC_THREAD_STATE
614	+	#define SIGSEGV_THREAD_STATE_COUNT              PPC_THREAD_STATE_COUNT
615	+	#define SIGSEGV_FAULT_INSTRUCTION               SIP->thr_state.srr0
616	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
617	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIP->thr_state.srr0, (unsigned long *)&SIP->thr_state.r0
618	+	#endif
619	+	#ifdef __ppc64__
620	+	#define SIGSEGV_EXCEPTION_STATE_TYPE    ppc_exception_state64_t
621	+	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  PPC_EXCEPTION_STATE64
622	+	#define SIGSEGV_EXCEPTION_STATE_COUNT   PPC_EXCEPTION_STATE64_COUNT
623	+	#define SIGSEGV_FAULT_ADDRESS                   SIP->exc_state.dar
624	+	#define SIGSEGV_THREAD_STATE_TYPE               ppc_thread_state64_t
625	+	#define SIGSEGV_THREAD_STATE_FLAVOR             PPC_THREAD_STATE64
626	+	#define SIGSEGV_THREAD_STATE_COUNT              PPC_THREAD_STATE64_COUNT
627	+	#define SIGSEGV_FAULT_INSTRUCTION               SIP->thr_state.srr0
628	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
629	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIP->thr_state.srr0, (unsigned long *)&SIP->thr_state.r0
630	+	#endif
631	+	#ifdef __i386__
632	+	#define SIGSEGV_EXCEPTION_STATE_TYPE    struct i386_exception_state
633	+	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  i386_EXCEPTION_STATE
634	+	#define SIGSEGV_EXCEPTION_STATE_COUNT   i386_EXCEPTION_STATE_COUNT
635	+	#define SIGSEGV_FAULT_ADDRESS                   SIP->exc_state.faultvaddr
636	+	#define SIGSEGV_THREAD_STATE_TYPE               struct i386_thread_state
637	+	#define SIGSEGV_THREAD_STATE_FLAVOR             i386_THREAD_STATE
638	+	#define SIGSEGV_THREAD_STATE_COUNT              i386_THREAD_STATE_COUNT
639	+	#define SIGSEGV_FAULT_INSTRUCTION               SIP->thr_state.eip
640	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
641	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&SIP->thr_state.eax) /* EAX is the first GPR we consider */
642	+	#endif
643	+	#ifdef __x86_64__
644	+	#define SIGSEGV_EXCEPTION_STATE_TYPE    struct x86_exception_state64
645	+	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  x86_EXCEPTION_STATE64
646	+	#define SIGSEGV_EXCEPTION_STATE_COUNT   x86_EXCEPTION_STATE64_COUNT
647	+	#define SIGSEGV_FAULT_ADDRESS                   SIP->exc_state.faultvaddr
648	+	#define SIGSEGV_THREAD_STATE_TYPE               struct x86_thread_state64
649	+	#define SIGSEGV_THREAD_STATE_FLAVOR             x86_THREAD_STATE64
650	+	#define SIGSEGV_THREAD_STATE_COUNT              x86_THREAD_STATE64_COUNT
651	+	#define SIGSEGV_FAULT_INSTRUCTION               SIP->thr_state.rip
652	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
653	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&SIP->thr_state.rax) /* RAX is the first GPR we consider */
654	+	#endif
655	+	#define SIGSEGV_FAULT_ADDRESS_FAST              code[1]
656	+	#define SIGSEGV_FAULT_INSTRUCTION_FAST  SIGSEGV_INVALID_ADDRESS
657	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code
658	+	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code
659	+
660	+	// Since there can only be one exception thread running at any time
661	+	// this is not a problem.
662	+	#define MSG_SIZE 512
663	+	static char msgbuf[MSG_SIZE];
664	+	static char replybuf[MSG_SIZE];
665	+
666	+	/*
667	+	* This is the entry point for the exception handler thread. The job
668	+	* of this thread is to wait for exception messages on the exception
669	+	* port that was setup beforehand and to pass them on to exc_server.
670	+	* exc_server is a MIG generated function that is a part of Mach.
671	+	* Its job is to decide what to do with the exception message. In our
672	+	* case exc_server calls catch_exception_raise on our behalf. After
673	+	* exc_server returns, it is our responsibility to send the reply.
674	+	*/
675	+	static void *
676	+	handleExceptions(void *priv)
677	+	{
678	+	mach_msg_header_t *msg, *reply;
679	+	kern_return_t krc;
680	+
681	+	msg = (mach_msg_header_t *)msgbuf;
682	+	reply = (mach_msg_header_t *)replybuf;
683	+
684	+	for (;;) {
685	+	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
686	+	_exceptionPort, 0, MACH_PORT_NULL);
687	+	MACH_CHECK_ERROR(mach_msg, krc);
688	+
689	+	if (!exc_server(msg, reply)) {
690	+	fprintf(stderr, "exc_server hated the message\n");
691	+	exit(1);
692	+	}
693	+
694	+	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
695	+	msg->msgh_local_port, 0, MACH_PORT_NULL);
696	+	if (krc != KERN_SUCCESS) {
697	+	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
698	+	krc, mach_error_string(krc));
699	+	exit(1);
700	+	}
701	+	}
702	+	}
703	+	#endif
704	+	#endif
705
706
707		/*
#	Line 387 | Line 710 | static sigsegv_address_t get_fault_addre
710
711		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
712		// Decode and skip X86 instruction
713	<	#if (defined(i386) || defined(__i386__))
713	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
714		#if defined(__linux__)
715		enum {
716	+	#if (defined(i386) || defined(__i386__))
717		X86_REG_EIP = 14,
718		X86_REG_EAX = 11,
719		X86_REG_ECX = 10,
#	Line 399 | Line 723 | enum {
723		X86_REG_EBP = 6,
724		X86_REG_ESI = 5,
725		X86_REG_EDI = 4
726	+	#endif
727	+	#if defined(__x86_64__)
728	+	X86_REG_R8  = 0,
729	+	X86_REG_R9  = 1,
730	+	X86_REG_R10 = 2,
731	+	X86_REG_R11 = 3,
732	+	X86_REG_R12 = 4,
733	+	X86_REG_R13 = 5,
734	+	X86_REG_R14 = 6,
735	+	X86_REG_R15 = 7,
736	+	X86_REG_EDI = 8,
737	+	X86_REG_ESI = 9,
738	+	X86_REG_EBP = 10,
739	+	X86_REG_EBX = 11,
740	+	X86_REG_EDX = 12,
741	+	X86_REG_EAX = 13,
742	+	X86_REG_ECX = 14,
743	+	X86_REG_ESP = 15,
744	+	X86_REG_EIP = 16
745	+	#endif
746		};
747		#endif
748	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
748	>	#if defined(__NetBSD__)
749		enum {
750	+	#if (defined(i386) || defined(__i386__))
751	+	X86_REG_EIP = _REG_EIP,
752	+	X86_REG_EAX = _REG_EAX,
753	+	X86_REG_ECX = _REG_ECX,
754	+	X86_REG_EDX = _REG_EDX,
755	+	X86_REG_EBX = _REG_EBX,
756	+	X86_REG_ESP = _REG_ESP,
757	+	X86_REG_EBP = _REG_EBP,
758	+	X86_REG_ESI = _REG_ESI,
759	+	X86_REG_EDI = _REG_EDI
760	+	#endif
761	+	};
762	+	#endif
763	+	#if defined(__FreeBSD__)
764	+	enum {
765	+	#if (defined(i386) || defined(__i386__))
766		X86_REG_EIP = 10,
767		X86_REG_EAX = 7,
768		X86_REG_ECX = 6,
#	Line 412 | Line 772 | enum {
772		X86_REG_EBP = 2,
773		X86_REG_ESI = 1,
774		X86_REG_EDI = 0
775	+	#endif
776	+	};
777	+	#endif
778	+	#if defined(__OpenBSD__)
779	+	enum {
780	+	#if defined(__i386__)
781	+	// EDI is the first register we consider
782	+	#define OREG(REG) offsetof(struct sigcontext, sc_##REG)
783	+	#define DREG(REG) ((OREG(REG) - OREG(edi)) / 4)
784	+	X86_REG_EIP = DREG(eip), // 7
785	+	X86_REG_EAX = DREG(eax), // 6
786	+	X86_REG_ECX = DREG(ecx), // 5
787	+	X86_REG_EDX = DREG(edx), // 4
788	+	X86_REG_EBX = DREG(ebx), // 3
789	+	X86_REG_ESP = DREG(esp), // 10
790	+	X86_REG_EBP = DREG(ebp), // 2
791	+	X86_REG_ESI = DREG(esi), // 1
792	+	X86_REG_EDI = DREG(edi)  // 0
793	+	#undef DREG
794	+	#undef OREG
795	+	#endif
796	+	};
797	+	#endif
798	+	#if defined(__sun__)
799	+	// Same as for Linux, need to check for x86-64
800	+	enum {
801	+	#if defined(__i386__)
802	+	X86_REG_EIP = EIP,
803	+	X86_REG_EAX = EAX,
804	+	X86_REG_ECX = ECX,
805	+	X86_REG_EDX = EDX,
806	+	X86_REG_EBX = EBX,
807	+	X86_REG_ESP = ESP,
808	+	X86_REG_EBP = EBP,
809	+	X86_REG_ESI = ESI,
810	+	X86_REG_EDI = EDI
811	+	#endif
812	+	};
813	+	#endif
814	+	#if defined(__APPLE__) && defined(__MACH__)
815	+	enum {
816	+	#if (defined(i386) || defined(__i386__))
817	+	#ifdef i386_SAVED_STATE
818	+	// same as FreeBSD (in Open Darwin 8.0.1)
819	+	X86_REG_EIP = 10,
820	+	X86_REG_EAX = 7,
821	+	X86_REG_ECX = 6,
822	+	X86_REG_EDX = 5,
823	+	X86_REG_EBX = 4,
824	+	X86_REG_ESP = 13,
825	+	X86_REG_EBP = 2,
826	+	X86_REG_ESI = 1,
827	+	X86_REG_EDI = 0
828	+	#else
829	+	// new layout (MacOS X 10.4.4 for x86)
830	+	X86_REG_EIP = 10,
831	+	X86_REG_EAX = 0,
832	+	X86_REG_ECX = 2,
833	+	X86_REG_EDX = 3,
834	+	X86_REG_EBX = 1,
835	+	X86_REG_ESP = 7,
836	+	X86_REG_EBP = 6,
837	+	X86_REG_ESI = 5,
838	+	X86_REG_EDI = 4
839	+	#endif
840	+	#endif
841	+	#if defined(__x86_64__)
842	+	X86_REG_R8  = 8,
843	+	X86_REG_R9  = 9,
844	+	X86_REG_R10 = 10,
845	+	X86_REG_R11 = 11,
846	+	X86_REG_R12 = 12,
847	+	X86_REG_R13 = 13,
848	+	X86_REG_R14 = 14,
849	+	X86_REG_R15 = 15,
850	+	X86_REG_EDI = 4,
851	+	X86_REG_ESI = 5,
852	+	X86_REG_EBP = 6,
853	+	X86_REG_EBX = 1,
854	+	X86_REG_EDX = 3,
855	+	X86_REG_EAX = 0,
856	+	X86_REG_ECX = 2,
857	+	X86_REG_ESP = 7,
858	+	X86_REG_EIP = 16
859	+	#endif
860	+	};
861	+	#endif
862	+	#if defined(_WIN32)
863	+	enum {
864	+	#if (defined(i386) || defined(__i386__))
865	+	X86_REG_EIP = 7,
866	+	X86_REG_EAX = 5,
867	+	X86_REG_ECX = 4,
868	+	X86_REG_EDX = 3,
869	+	X86_REG_EBX = 2,
870	+	X86_REG_ESP = 10,
871	+	X86_REG_EBP = 6,
872	+	X86_REG_ESI = 1,
873	+	X86_REG_EDI = 0
874	+	#endif
875		};
876		#endif
877		// FIXME: this is partly redundant with the instruction decoding phase
#	Line 448 | Line 908 | static inline int ix86_step_over_modrm(u
908		return offset;
909		}
910
911	<	static bool ix86_skip_instruction(unsigned int * regs)
911	>	static bool ix86_skip_instruction(unsigned long * regs)
912		{
913		unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
914
915		if (eip == 0)
916		return false;
917	+	#ifdef _WIN32
918	+	if (IsBadCodePtr((FARPROC)eip))
919	+	return false;
920	+	#endif
921
922	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
922	>	enum instruction_type_t {
923	>	i_MOV,
924	>	i_ADD
925	>	};
926	>
927	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
928		transfer_size_t transfer_size = SIZE_LONG;
929	+	instruction_type_t instruction_type = i_MOV;
930
931		int reg = -1;
932		int len = 0;
933	<
933	>
934	>	#if DEBUG
935	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
936	>	eip, eip[0], eip[1], eip[2], eip[3]);
937	>	#endif
938	>
939		// Operand size prefix
940		if (*eip == 0x66) {
941		eip++;
#	Line 468 | Line 943 | static bool ix86_skip_instruction(unsign
943		transfer_size = SIZE_WORD;
944		}
945
946	+	// REX prefix
947	+	#if defined(__x86_64__)
948	+	struct rex_t {
949	+	unsigned char W;
950	+	unsigned char R;
951	+	unsigned char X;
952	+	unsigned char B;
953	+	};
954	+	rex_t rex = { 0, 0, 0, 0 };
955	+	bool has_rex = false;
956	+	if ((*eip & 0xf0) == 0x40) {
957	+	has_rex = true;
958	+	const unsigned char b = *eip;
959	+	rex.W = b & (1 << 3);
960	+	rex.R = b & (1 << 2);
961	+	rex.X = b & (1 << 1);
962	+	rex.B = b & (1 << 0);
963	+	#if DEBUG
964	+	printf("REX: %c,%c,%c,%c\n",
965	+	rex.W ? 'W' : '_',
966	+	rex.R ? 'R' : '_',
967	+	rex.X ? 'X' : '_',
968	+	rex.B ? 'B' : '_');
969	+	#endif
970	+	eip++;
971	+	len++;
972	+	if (rex.W)
973	+	transfer_size = SIZE_QUAD;
974	+	}
975	+	#else
976	+	const bool has_rex = false;
977	+	#endif
978	+
979		// Decode instruction
980	+	int op_len = 1;
981	+	int target_size = SIZE_UNKNOWN;
982		switch (eip[0]) {
983		case 0x0f:
984	+	target_size = transfer_size;
985		switch (eip[1]) {
986	+	case 0xbe: // MOVSX r32, r/m8
987		case 0xb6: // MOVZX r32, r/m8
988	+	transfer_size = SIZE_BYTE;
989	+	goto do_mov_extend;
990	+	case 0xbf: // MOVSX r32, r/m16
991		case 0xb7: // MOVZX r32, r/m16
992	<	switch (eip[2] & 0xc0) {
993	<	case 0x80:
994	<	reg = (eip[2] >> 3) & 7;
995	<	transfer_type = TYPE_LOAD;
996	<	break;
482	<	case 0x40:
483	<	reg = (eip[2] >> 3) & 7;
484	<	transfer_type = TYPE_LOAD;
485	<	break;
486	<	case 0x00:
487	<	reg = (eip[2] >> 3) & 7;
488	<	transfer_type = TYPE_LOAD;
489	<	break;
992	>	transfer_size = SIZE_WORD;
993	>	goto do_mov_extend;
994	>	do_mov_extend:
995	>	op_len = 2;
996	>	goto do_transfer_load;
997		}
491	–	len += 3 + ix86_step_over_modrm(eip + 2);
998		break;
999	<	}
1000	<	break;
999	>	#if defined(__x86_64__)
1000	>	case 0x63: // MOVSXD r64, r/m32
1001	>	if (has_rex && rex.W) {
1002	>	transfer_size = SIZE_LONG;
1003	>	target_size = SIZE_QUAD;
1004	>	}
1005	>	else if (transfer_size != SIZE_WORD) {
1006	>	transfer_size = SIZE_LONG;
1007	>	target_size = SIZE_QUAD;
1008	>	}
1009	>	goto do_transfer_load;
1010	>	#endif
1011	>	case 0x02: // ADD r8, r/m8
1012	>	transfer_size = SIZE_BYTE;
1013	>	case 0x03: // ADD r32, r/m32
1014	>	instruction_type = i_ADD;
1015	>	goto do_transfer_load;
1016		case 0x8a: // MOV r8, r/m8
1017		transfer_size = SIZE_BYTE;
1018		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
1019	<	switch (eip[1] & 0xc0) {
1019	>	do_transfer_load:
1020	>	switch (eip[op_len] & 0xc0) {
1021		case 0x80:
1022	<	reg = (eip[1] >> 3) & 7;
1023	<	transfer_type = TYPE_LOAD;
1022	>	reg = (eip[op_len] >> 3) & 7;
1023	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1024		break;
1025		case 0x40:
1026	<	reg = (eip[1] >> 3) & 7;
1027	<	transfer_type = TYPE_LOAD;
1026	>	reg = (eip[op_len] >> 3) & 7;
1027	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1028		break;
1029		case 0x00:
1030	<	reg = (eip[1] >> 3) & 7;
1031	<	transfer_type = TYPE_LOAD;
1030	>	reg = (eip[op_len] >> 3) & 7;
1031	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1032		break;
1033		}
1034	<	len += 2 + ix86_step_over_modrm(eip + 1);
1034	>	len += 1 + op_len + ix86_step_over_modrm(eip + op_len);
1035		break;
1036	+	case 0x00: // ADD r/m8, r8
1037	+	transfer_size = SIZE_BYTE;
1038	+	case 0x01: // ADD r/m32, r32
1039	+	instruction_type = i_ADD;
1040	+	goto do_transfer_store;
1041		case 0x88: // MOV r/m8, r8
1042		transfer_size = SIZE_BYTE;
1043		case 0x89: // MOV r/m32, r32 (or 16-bit operation)
1044	<	switch (eip[1] & 0xc0) {
1044	>	do_transfer_store:
1045	>	switch (eip[op_len] & 0xc0) {
1046		case 0x80:
1047	<	reg = (eip[1] >> 3) & 7;
1048	<	transfer_type = TYPE_STORE;
1047	>	reg = (eip[op_len] >> 3) & 7;
1048	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1049		break;
1050		case 0x40:
1051	<	reg = (eip[1] >> 3) & 7;
1052	<	transfer_type = TYPE_STORE;
1051	>	reg = (eip[op_len] >> 3) & 7;
1052	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1053		break;
1054		case 0x00:
1055	<	reg = (eip[1] >> 3) & 7;
1056	<	transfer_type = TYPE_STORE;
1055	>	reg = (eip[op_len] >> 3) & 7;
1056	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1057		break;
1058		}
1059	<	len += 2 + ix86_step_over_modrm(eip + 1);
1059	>	len += 1 + op_len + ix86_step_over_modrm(eip + op_len);
1060		break;
1061		}
1062	+	if (target_size == SIZE_UNKNOWN)
1063	+	target_size = transfer_size;
1064
1065	<	if (transfer_type == TYPE_UNKNOWN) {
1065	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1066		// Unknown machine code, let it crash. Then patch the decoder
1067		return false;
1068		}
1069
1070	<	if (transfer_type == TYPE_LOAD && reg != -1) {
1071	<	static const int x86_reg_map[8] = {
1070	>	#if defined(__x86_64__)
1071	>	if (rex.R)
1072	>	reg += 8;
1073	>	#endif
1074	>
1075	>	if (instruction_type == i_MOV && transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
1076	>	static const int x86_reg_map[] = {
1077		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
1078	<	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
1078	>	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
1079	>	#if defined(__x86_64__)
1080	>	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
1081	>	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
1082	>	#endif
1083		};
1084
1085	<	if (reg < 0 || reg >= 8)
1085	>	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
1086		return false;
1087
1088	+	// Set 0 to the relevant register part
1089	+	// NOTE: this is only valid for MOV alike instructions
1090		int rloc = x86_reg_map[reg];
1091	<	switch (transfer_size) {
1091	>	switch (target_size) {
1092		case SIZE_BYTE:
1093	<	regs[rloc] = (regs[rloc] & ~0xff);
1093	>	if (has_rex || reg < 4)
1094	>	regs[rloc] = (regs[rloc] & ~0x00ffL);
1095	>	else {
1096	>	rloc = x86_reg_map[reg - 4];
1097	>	regs[rloc] = (regs[rloc] & ~0xff00L);
1098	>	}
1099		break;
1100		case SIZE_WORD:
1101	<	regs[rloc] = (regs[rloc] & ~0xffff);
1101	>	regs[rloc] = (regs[rloc] & ~0xffffL);
1102		break;
1103		case SIZE_LONG:
1104	+	case SIZE_QUAD: // zero-extension
1105		regs[rloc] = 0;
1106		break;
1107		}
1108		}
1109
1110		#if DEBUG
1111	<	printf("%08x: %s %s access", regs[X86_REG_EIP],
1112	<	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
1113	<	transfer_type == TYPE_LOAD ? "read" : "write");
1111	>	printf("%p: %s %s access", (void *)regs[X86_REG_EIP],
1112	>	transfer_size == SIZE_BYTE ? "byte" :
1113	>	transfer_size == SIZE_WORD ? "word" :
1114	>	transfer_size == SIZE_LONG ? "long" :
1115	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1116	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1117
1118		if (reg != -1) {
1119	<	static const char * x86_reg_str_map[8] = {
1120	<	"eax", "ecx", "edx", "ebx",
1121	<	"esp", "ebp", "esi", "edi"
1119	>	static const char * x86_byte_reg_str_map[] = {
1120	>	"al",   "cl",   "dl",   "bl",
1121	>	"spl",  "bpl",  "sil",  "dil",
1122	>	"r8b",  "r9b",  "r10b", "r11b",
1123	>	"r12b", "r13b", "r14b", "r15b",
1124	>	"ah",   "ch",   "dh",   "bh",
1125	>	};
1126	>	static const char * x86_word_reg_str_map[] = {
1127	>	"ax",   "cx",   "dx",   "bx",
1128	>	"sp",   "bp",   "si",   "di",
1129	>	"r8w",  "r9w",  "r10w", "r11w",
1130	>	"r12w", "r13w", "r14w", "r15w",
1131	>	};
1132	>	static const char *x86_long_reg_str_map[] = {
1133	>	"eax",  "ecx",  "edx",  "ebx",
1134	>	"esp",  "ebp",  "esi",  "edi",
1135	>	"r8d",  "r9d",  "r10d", "r11d",
1136	>	"r12d", "r13d", "r14d", "r15d",
1137	>	};
1138	>	static const char *x86_quad_reg_str_map[] = {
1139	>	"rax", "rcx", "rdx", "rbx",
1140	>	"rsp", "rbp", "rsi", "rdi",
1141	>	"r8",  "r9",  "r10", "r11",
1142	>	"r12", "r13", "r14", "r15",
1143		};
1144	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
1144	>	const char * reg_str = NULL;
1145	>	switch (target_size) {
1146	>	case SIZE_BYTE:
1147	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
1148	>	break;
1149	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
1150	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
1151	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
1152	>	}
1153	>	if (reg_str)
1154	>	printf(" %s register %%%s",
1155	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
1156	>	reg_str);
1157		}
1158		printf(", %d bytes instruction\n", len);
1159		#endif
#	Line 580 | Line 1163 | static bool ix86_skip_instruction(unsign
1163		}
1164		#endif
1165
1166	+	// Decode and skip IA-64 instruction
1167	+	#if defined(__ia64__)
1168	+	#if defined(__linux__)
1169	+	// XXX: we assume everything is 8-byte aligned
1170	+	#define OREG(REG) offsetof(struct sigcontext, sc_##REG)
1171	+	#define IREG(REG) ((OREG(REG) - OREG(flags)) / 8)
1172	+	enum {
1173	+	IA64_REG_IP  = IREG(ip),
1174	+	IA64_REG_NAT = IREG(nat),
1175	+	IA64_REG_PR  = IREG(pr),
1176	+	IA64_REG_GR  = IREG(gr)
1177	+	};
1178	+	#undef IREG
1179	+	#undef OREG
1180	+	#endif
1181	+
1182	+	// Helper macros to access the machine context
1183	+	#define IA64_CONTEXT                    (ctx)
1184	+	#define IA64_GET_PR(P)                  ((IA64_CONTEXT[IA64_REG_PR] >> (P)) & 1)
1185	+	#define IA64_GET_NAT(I)                 ((IA64_CONTEXT[IA64_REG_NAT] >> (I)) & 1)
1186	+	#define IA64_SET_NAT(I,V)               (IA64_CONTEXT[IA64_REG_NAT] = (IA64_CONTEXT[IA64_REG_NAT] & ~(1ul << (I))) | (((unsigned long)!!(V)) << (I)))
1187	+	#define IA64_GET_GR(R)                  (IA64_CONTEXT[IA64_REG_GR + (R)])
1188	+	#define IA64_SET_GR(R,V)                (IA64_CONTEXT[IA64_REG_GR + (R)] = (V))
1189	+
1190	+	// Instruction operations
1191	+	enum {
1192	+	IA64_INST_UNKNOWN = 0,
1193	+	IA64_INST_LD1,                          // ld1 op0=[op1]
1194	+	IA64_INST_LD1_UPDATE,           // ld1 op0=[op1],op2
1195	+	IA64_INST_LD2,                          // ld2 op0=[op1]
1196	+	IA64_INST_LD2_UPDATE,           // ld2 op0=[op1],op2
1197	+	IA64_INST_LD4,                          // ld4 op0=[op1]
1198	+	IA64_INST_LD4_UPDATE,           // ld4 op0=[op1],op2
1199	+	IA64_INST_LD8,                          // ld8 op0=[op1]
1200	+	IA64_INST_LD8_UPDATE,           // ld8 op0=[op1],op2
1201	+	IA64_INST_ST1,                          // st1 [op0]=op1
1202	+	IA64_INST_ST1_UPDATE,           // st1 [op0]=op1,op2
1203	+	IA64_INST_ST2,                          // st2 [op0]=op1
1204	+	IA64_INST_ST2_UPDATE,           // st2 [op0]=op1,op2
1205	+	IA64_INST_ST4,                          // st4 [op0]=op1
1206	+	IA64_INST_ST4_UPDATE,           // st4 [op0]=op1,op2
1207	+	IA64_INST_ST8,                          // st8 [op0]=op1
1208	+	IA64_INST_ST8_UPDATE,           // st8 [op0]=op1,op2
1209	+	IA64_INST_ADD,                          // add op0=op1,op2,op3
1210	+	IA64_INST_SUB,                          // sub op0=op1,op2,op3
1211	+	IA64_INST_SHLADD,                       // shladd op0=op1,op3,op2
1212	+	IA64_INST_AND,                          // and op0=op1,op2
1213	+	IA64_INST_ANDCM,                        // andcm op0=op1,op2
1214	+	IA64_INST_OR,                           // or op0=op1,op2
1215	+	IA64_INST_XOR,                          // xor op0=op1,op2
1216	+	IA64_INST_SXT1,                         // sxt1 op0=op1
1217	+	IA64_INST_SXT2,                         // sxt2 op0=op1
1218	+	IA64_INST_SXT4,                         // sxt4 op0=op1
1219	+	IA64_INST_ZXT1,                         // zxt1 op0=op1
1220	+	IA64_INST_ZXT2,                         // zxt2 op0=op1
1221	+	IA64_INST_ZXT4,                         // zxt4 op0=op1
1222	+	IA64_INST_NOP                           // nop op0
1223	+	};
1224	+
1225	+	const int IA64_N_OPERANDS = 4;
1226	+
1227	+	// Decoded operand type
1228	+	struct ia64_operand_t {
1229	+	unsigned char commit;
1230	+	unsigned char valid;
1231	+	signed char index;
1232	+	unsigned char nat;
1233	+	unsigned long value;
1234	+	};
1235	+
1236	+	// Decoded instruction type
1237	+	struct ia64_instruction_t {
1238	+	unsigned char mnemo;
1239	+	unsigned char pred;
1240	+	unsigned char no_memory;
1241	+	unsigned long inst;
1242	+	ia64_operand_t operands[IA64_N_OPERANDS];
1243	+	};
1244	+
1245	+	// Get immediate sign-bit
1246	+	static inline int ia64_inst_get_sbit(unsigned long inst)
1247	+	{
1248	+	return (inst >> 36) & 1;
1249	+	}
1250	+
1251	+	// Get 8-bit immediate value (A3, A8, I27, M30)
1252	+	static inline unsigned long ia64_inst_get_imm8(unsigned long inst)
1253	+	{
1254	+	unsigned long value = (inst >> 13) & 0x7ful;
1255	+	if (ia64_inst_get_sbit(inst))
1256	+	value |= ~0x7ful;
1257	+	return value;
1258	+	}
1259	+
1260	+	// Get 9-bit immediate value (M3)
1261	+	static inline unsigned long ia64_inst_get_imm9b(unsigned long inst)
1262	+	{
1263	+	unsigned long value = (((inst >> 27) & 1) << 7) | ((inst >> 13) & 0x7f);
1264	+	if (ia64_inst_get_sbit(inst))
1265	+	value |= ~0xfful;
1266	+	return value;
1267	+	}
1268	+
1269	+	// Get 9-bit immediate value (M5)
1270	+	static inline unsigned long ia64_inst_get_imm9a(unsigned long inst)
1271	+	{
1272	+	unsigned long value = (((inst >> 27) & 1) << 7) | ((inst >> 6) & 0x7f);
1273	+	if (ia64_inst_get_sbit(inst))
1274	+	value |= ~0xfful;
1275	+	return value;
1276	+	}
1277	+
1278	+	// Get 14-bit immediate value (A4)
1279	+	static inline unsigned long ia64_inst_get_imm14(unsigned long inst)
1280	+	{
1281	+	unsigned long value = (((inst >> 27) & 0x3f) << 7) | (inst & 0x7f);
1282	+	if (ia64_inst_get_sbit(inst))
1283	+	value |= ~0x1fful;
1284	+	return value;
1285	+	}
1286	+
1287	+	// Get 22-bit immediate value (A5)
1288	+	static inline unsigned long ia64_inst_get_imm22(unsigned long inst)
1289	+	{
1290	+	unsigned long value = ((((inst >> 22) & 0x1f) << 16) |
1291	+	(((inst >> 27) & 0x1ff) << 7) |
1292	+	(inst & 0x7f));
1293	+	if (ia64_inst_get_sbit(inst))
1294	+	value |= ~0x1ffffful;
1295	+	return value;
1296	+	}
1297	+
1298	+	// Get 21-bit immediate value (I19)
1299	+	static inline unsigned long ia64_inst_get_imm21(unsigned long inst)
1300	+	{
1301	+	return (((inst >> 36) & 1) << 20) | ((inst >> 6) & 0xfffff);
1302	+	}
1303	+
1304	+	// Get 2-bit count value (A2)
1305	+	static inline int ia64_inst_get_count2(unsigned long inst)
1306	+	{
1307	+	return (inst >> 27) & 0x3;
1308	+	}
1309	+
1310	+	// Get bundle template
1311	+	static inline unsigned int ia64_get_template(unsigned long raw_ip)
1312	+	{
1313	+	unsigned long *ip = (unsigned long *)(raw_ip & ~3ul);
1314	+	return ip[0] & 0x1f;
1315	+	}
1316	+
1317	+	// Get specified instruction in bundle
1318	+	static unsigned long ia64_get_instruction(unsigned long raw_ip, int slot)
1319	+	{
1320	+	unsigned long inst;
1321	+	unsigned long *ip = (unsigned long *)(raw_ip & ~3ul);
1322	+	#if DEBUG
1323	+	printf("Bundle: %016lx%016lx\n", ip[1], ip[0]);
1324	+	#endif
1325	+
1326	+	switch (slot) {
1327	+	case 0:
1328	+	inst = (ip[0] >> 5) & 0x1fffffffffful;
1329	+	break;
1330	+	case 1:
1331	+	inst = ((ip[1] & 0x7ffffful) << 18) | ((ip[0] >> 46) & 0x3fffful);
1332	+	break;
1333	+	case 2:
1334	+	inst = (ip[1] >> 23) & 0x1fffffffffful;
1335	+	break;
1336	+	case 3:
1337	+	fprintf(stderr, "ERROR: ia64_get_instruction(), invalid slot number %d\n", slot);
1338	+	abort();
1339	+	break;
1340	+	}
1341	+
1342	+	#if DEBUG
1343	+	printf(" Instruction %d: 0x%016lx\n", slot, inst);
1344	+	#endif
1345	+	return inst;
1346	+	}
1347	+
1348	+	// Decode group 0 instructions
1349	+	static bool ia64_decode_instruction_0(ia64_instruction_t *inst, unsigned long *ctx)
1350	+	{
1351	+	const int r1 = (inst->inst >>  6) & 0x7f;
1352	+	const int r3 = (inst->inst >> 20) & 0x7f;
1353	+
1354	+	const int x3 = (inst->inst >> 33) & 0x07;
1355	+	const int x6 = (inst->inst >> 27) & 0x3f;
1356	+	const int x2 = (inst->inst >> 31) & 0x03;
1357	+	const int x4 = (inst->inst >> 27) & 0x0f;
1358	+
1359	+	if (x3 == 0) {
1360	+	switch (x6) {
1361	+	case 0x01:                                              // nop.i (I19)
1362	+	inst->mnemo = IA64_INST_NOP;
1363	+	inst->operands[0].valid = true;
1364	+	inst->operands[0].index = -1;
1365	+	inst->operands[0].value = ia64_inst_get_imm21(inst->inst);
1366	+	return true;
1367	+	case 0x14:                                              // sxt1 (I29)
1368	+	case 0x15:                                              // sxt2 (I29)
1369	+	case 0x16:                                              // sxt4 (I29)
1370	+	case 0x10:                                              // zxt1 (I29)
1371	+	case 0x11:                                              // zxt2 (I29)
1372	+	case 0x12:                                              // zxt4 (I29)
1373	+	switch (x6) {
1374	+	case 0x14: inst->mnemo = IA64_INST_SXT1; break;
1375	+	case 0x15: inst->mnemo = IA64_INST_SXT2; break;
1376	+	case 0x16: inst->mnemo = IA64_INST_SXT4; break;
1377	+	case 0x10: inst->mnemo = IA64_INST_ZXT1; break;
1378	+	case 0x11: inst->mnemo = IA64_INST_ZXT2; break;
1379	+	case 0x12: inst->mnemo = IA64_INST_ZXT4; break;
1380	+	default: abort();
1381	+	}
1382	+	inst->operands[0].valid = true;
1383	+	inst->operands[0].index = r1;
1384	+	inst->operands[1].valid = true;
1385	+	inst->operands[1].index = r3;
1386	+	inst->operands[1].value = IA64_GET_GR(r3);
1387	+	inst->operands[1].nat   = IA64_GET_NAT(r3);
1388	+	return true;
1389	+	}
1390	+	}
1391	+	return false;
1392	+	}
1393	+
1394	+	// Decode group 4 instructions (load/store instructions)
1395	+	static bool ia64_decode_instruction_4(ia64_instruction_t *inst, unsigned long *ctx)
1396	+	{
1397	+	const int r1 = (inst->inst >> 6) & 0x7f;
1398	+	const int r2 = (inst->inst >> 13) & 0x7f;
1399	+	const int r3 = (inst->inst >> 20) & 0x7f;
1400	+
1401	+	const int m  = (inst->inst >> 36) & 1;
1402	+	const int x  = (inst->inst >> 27) & 1;
1403	+	const int x6 = (inst->inst >> 30) & 0x3f;
1404	+
1405	+	switch (x6) {
1406	+	case 0x00:
1407	+	case 0x01:
1408	+	case 0x02:
1409	+	case 0x03:
1410	+	if (x == 0) {
1411	+	inst->operands[0].valid = true;
1412	+	inst->operands[0].index = r1;
1413	+	inst->operands[1].valid = true;
1414	+	inst->operands[1].index = r3;
1415	+	inst->operands[1].value = IA64_GET_GR(r3);
1416	+	inst->operands[1].nat   = IA64_GET_NAT(r3);
1417	+	if (m == 0) {
1418	+	switch (x6) {
1419	+	case 0x00: inst->mnemo = IA64_INST_LD1; break;
1420	+	case 0x01: inst->mnemo = IA64_INST_LD2; break;
1421	+	case 0x02: inst->mnemo = IA64_INST_LD4; break;
1422	+	case 0x03: inst->mnemo = IA64_INST_LD8; break;
1423	+	}
1424	+	}
1425	+	else {
1426	+	inst->operands[2].valid = true;
1427	+	inst->operands[2].index = r2;
1428	+	inst->operands[2].value = IA64_GET_GR(r2);
1429	+	inst->operands[2].nat   = IA64_GET_NAT(r2);
1430	+	switch (x6) {
1431	+	case 0x00: inst->mnemo = IA64_INST_LD1_UPDATE; break;
1432	+	case 0x01: inst->mnemo = IA64_INST_LD2_UPDATE; break;
1433	+	case 0x02: inst->mnemo = IA64_INST_LD4_UPDATE; break;
1434	+	case 0x03: inst->mnemo = IA64_INST_LD8_UPDATE; break;
1435	+	}
1436	+	}
1437	+	return true;
1438	+	}
1439	+	break;
1440	+	case 0x30:
1441	+	case 0x31:
1442	+	case 0x32:
1443	+	case 0x33:
1444	+	if (m == 0 && x == 0) {
1445	+	inst->operands[0].valid = true;
1446	+	inst->operands[0].index = r3;
1447	+	inst->operands[0].value = IA64_GET_GR(r3);
1448	+	inst->operands[0].nat   = IA64_GET_NAT(r3);
1449	+	inst->operands[1].valid = true;
1450	+	inst->operands[1].index = r2;
1451	+	inst->operands[1].value = IA64_GET_GR(r2);
1452	+	inst->operands[1].nat   = IA64_GET_NAT(r2);
1453	+	switch (x6) {
1454	+	case 0x30: inst->mnemo = IA64_INST_ST1; break;
1455	+	case 0x31: inst->mnemo = IA64_INST_ST2; break;
1456	+	case 0x32: inst->mnemo = IA64_INST_ST4; break;
1457	+	case 0x33: inst->mnemo = IA64_INST_ST8; break;
1458	+	}
1459	+	return true;
1460	+	}
1461	+	break;
1462	+	}
1463	+	return false;
1464	+	}
1465	+
1466	+	// Decode group 5 instructions (load/store instructions)
1467	+	static bool ia64_decode_instruction_5(ia64_instruction_t *inst, unsigned long *ctx)
1468	+	{
1469	+	const int r1 = (inst->inst >> 6) & 0x7f;
1470	+	const int r2 = (inst->inst >> 13) & 0x7f;
1471	+	const int r3 = (inst->inst >> 20) & 0x7f;
1472	+
1473	+	const int x6 = (inst->inst >> 30) & 0x3f;
1474	+
1475	+	switch (x6) {
1476	+	case 0x00:
1477	+	case 0x01:
1478	+	case 0x02:
1479	+	case 0x03:
1480	+	inst->operands[0].valid = true;
1481	+	inst->operands[0].index = r1;
1482	+	inst->operands[1].valid = true;
1483	+	inst->operands[1].index = r3;
1484	+	inst->operands[1].value = IA64_GET_GR(r3);
1485	+	inst->operands[1].nat   = IA64_GET_NAT(r3);
1486	+	inst->operands[2].valid = true;
1487	+	inst->operands[2].index = -1;
1488	+	inst->operands[2].value = ia64_inst_get_imm9b(inst->inst);
1489	+	inst->operands[2].nat   = 0;
1490	+	switch (x6) {
1491	+	case 0x00: inst->mnemo = IA64_INST_LD1_UPDATE; break;
1492	+	case 0x01: inst->mnemo = IA64_INST_LD2_UPDATE; break;
1493	+	case 0x02: inst->mnemo = IA64_INST_LD4_UPDATE; break;
1494	+	case 0x03: inst->mnemo = IA64_INST_LD8_UPDATE; break;
1495	+	}
1496	+	return true;
1497	+	case 0x30:
1498	+	case 0x31:
1499	+	case 0x32:
1500	+	case 0x33:
1501	+	inst->operands[0].valid = true;
1502	+	inst->operands[0].index = r3;
1503	+	inst->operands[0].value = IA64_GET_GR(r3);
1504	+	inst->operands[0].nat   = IA64_GET_NAT(r3);
1505	+	inst->operands[1].valid = true;
1506	+	inst->operands[1].index = r2;
1507	+	inst->operands[1].value = IA64_GET_GR(r2);
1508	+	inst->operands[1].nat   = IA64_GET_NAT(r2);
1509	+	inst->operands[2].valid = true;
1510	+	inst->operands[2].index = -1;
1511	+	inst->operands[2].value = ia64_inst_get_imm9a(inst->inst);
1512	+	inst->operands[2].nat   = 0;
1513	+	switch (x6) {
1514	+	case 0x30: inst->mnemo = IA64_INST_ST1_UPDATE; break;
1515	+	case 0x31: inst->mnemo = IA64_INST_ST2_UPDATE; break;
1516	+	case 0x32: inst->mnemo = IA64_INST_ST4_UPDATE; break;
1517	+	case 0x33: inst->mnemo = IA64_INST_ST8_UPDATE; break;
1518	+	}
1519	+	return true;
1520	+	}
1521	+	return false;
1522	+	}
1523	+
1524	+	// Decode group 8 instructions (ALU integer)
1525	+	static bool ia64_decode_instruction_8(ia64_instruction_t *inst, unsigned long *ctx)
1526	+	{
1527	+	const int r1  = (inst->inst >> 6) & 0x7f;
1528	+	const int r2  = (inst->inst >> 13) & 0x7f;
1529	+	const int r3  = (inst->inst >> 20) & 0x7f;
1530	+
1531	+	const int x2a = (inst->inst >> 34) & 0x3;
1532	+	const int x2b = (inst->inst >> 27) & 0x3;
1533	+	const int x4  = (inst->inst >> 29) & 0xf;
1534	+	const int ve  = (inst->inst >> 33) & 0x1;
1535	+
1536	+	// destination register (r1) is always valid in this group
1537	+	inst->operands[0].valid = true;
1538	+	inst->operands[0].index = r1;
1539	+
1540	+	// source register (r3) is always valid in this group
1541	+	inst->operands[2].valid = true;
1542	+	inst->operands[2].index = r3;
1543	+	inst->operands[2].value = IA64_GET_GR(r3);
1544	+	inst->operands[2].nat   = IA64_GET_NAT(r3);
1545	+
1546	+	if (x2a == 0 && ve == 0) {
1547	+	inst->operands[1].valid = true;
1548	+	inst->operands[1].index = r2;
1549	+	inst->operands[1].value = IA64_GET_GR(r2);
1550	+	inst->operands[1].nat   = IA64_GET_NAT(r2);
1551	+	switch (x4) {
1552	+	case 0x0:                               // add (A1)
1553	+	inst->mnemo = IA64_INST_ADD;
1554	+	inst->operands[3].valid = true;
1555	+	inst->operands[3].index = -1;
1556	+	inst->operands[3].value = x2b == 1;
1557	+	return true;
1558	+	case 0x1:                               // add (A1)
1559	+	inst->mnemo = IA64_INST_SUB;
1560	+	inst->operands[3].valid = true;
1561	+	inst->operands[3].index = -1;
1562	+	inst->operands[3].value = x2b == 0;
1563	+	return true;
1564	+	case 0x4:                               // shladd (A2)
1565	+	inst->mnemo = IA64_INST_SHLADD;
1566	+	inst->operands[3].valid = true;
1567	+	inst->operands[3].index = -1;
1568	+	inst->operands[3].value = ia64_inst_get_count2(inst->inst);
1569	+	return true;
1570	+	case 0x9:
1571	+	if (x2b == 1) {
1572	+	inst->mnemo = IA64_INST_SUB;
1573	+	inst->operands[1].index = -1;
1574	+	inst->operands[1].value = ia64_inst_get_imm8(inst->inst);
1575	+	inst->operands[1].nat   = 0;
1576	+	return true;
1577	+	}
1578	+	break;
1579	+	case 0xb:
1580	+	inst->operands[1].index = -1;
1581	+	inst->operands[1].value = ia64_inst_get_imm8(inst->inst);
1582	+	inst->operands[1].nat   = 0;
1583	+	// fall-through
1584	+	case 0x3:
1585	+	switch (x2b) {
1586	+	case 0: inst->mnemo = IA64_INST_AND;   break;
1587	+	case 1: inst->mnemo = IA64_INST_ANDCM; break;
1588	+	case 2: inst->mnemo = IA64_INST_OR;    break;
1589	+	case 3: inst->mnemo = IA64_INST_XOR;   break;
1590	+	}
1591	+	return true;
1592	+	}
1593	+	}
1594	+	return false;
1595	+	}
1596	+
1597	+	// Decode instruction
1598	+	static bool ia64_decode_instruction(ia64_instruction_t *inst, unsigned long *ctx)
1599	+	{
1600	+	const int major = (inst->inst >> 37) & 0xf;
1601	+
1602	+	inst->mnemo = IA64_INST_UNKNOWN;
1603	+	inst->pred  = inst->inst & 0x3f;
1604	+	memset(&inst->operands[0], 0, sizeof(inst->operands));
1605	+
1606	+	switch (major) {
1607	+	case 0x0: return ia64_decode_instruction_0(inst, ctx);
1608	+	case 0x4: return ia64_decode_instruction_4(inst, ctx);
1609	+	case 0x5: return ia64_decode_instruction_5(inst, ctx);
1610	+	case 0x8: return ia64_decode_instruction_8(inst, ctx);
1611	+	}
1612	+	return false;
1613	+	}
1614	+
1615	+	static bool ia64_emulate_instruction(ia64_instruction_t *inst, unsigned long *ctx)
1616	+	{
1617	+	if (inst->mnemo == IA64_INST_UNKNOWN)
1618	+	return false;
1619	+	if (inst->pred && !IA64_GET_PR(inst->pred))
1620	+	return true;
1621	+
1622	+	unsigned char nat, nat2;
1623	+	unsigned long dst, dst2, src1, src2, src3;
1624	+
1625	+	switch (inst->mnemo) {
1626	+	case IA64_INST_NOP:
1627	+	break;
1628	+	case IA64_INST_ADD:
1629	+	case IA64_INST_SUB:
1630	+	case IA64_INST_SHLADD:
1631	+	src3 = inst->operands[3].value;
1632	+	// fall-through
1633	+	case IA64_INST_AND:
1634	+	case IA64_INST_ANDCM:
1635	+	case IA64_INST_OR:
1636	+	case IA64_INST_XOR:
1637	+	src1 = inst->operands[1].value;
1638	+	src2 = inst->operands[2].value;
1639	+	switch (inst->mnemo) {
1640	+	case IA64_INST_ADD:   dst = src1 + src2 + src3; break;
1641	+	case IA64_INST_SUB:   dst = src1 - src2 - src3; break;
1642	+	case IA64_INST_SHLADD: dst = (src1 << src3) + src2; break;
1643	+	case IA64_INST_AND:   dst = src1 & src2;                break;
1644	+	case IA64_INST_ANDCM: dst = src1 &~ src2;               break;
1645	+	case IA64_INST_OR:    dst = src1 | src2;                break;
1646	+	case IA64_INST_XOR:   dst = src1 ^ src2;                break;
1647	+	}
1648	+	inst->operands[0].commit = true;
1649	+	inst->operands[0].value  = dst;
1650	+	inst->operands[0].nat    = inst->operands[1].nat | inst->operands[2].nat;
1651	+	break;
1652	+	case IA64_INST_SXT1:
1653	+	case IA64_INST_SXT2:
1654	+	case IA64_INST_SXT4:
1655	+	case IA64_INST_ZXT1:
1656	+	case IA64_INST_ZXT2:
1657	+	case IA64_INST_ZXT4:
1658	+	src1 = inst->operands[1].value;
1659	+	switch (inst->mnemo) {
1660	+	case IA64_INST_SXT1: dst = (signed long)(signed char)src1;              break;
1661	+	case IA64_INST_SXT2: dst = (signed long)(signed short)src1;             break;
1662	+	case IA64_INST_SXT4: dst = (signed long)(signed int)src1;               break;
1663	+	case IA64_INST_ZXT1: dst = (unsigned char)src1;                                 break;
1664	+	case IA64_INST_ZXT2: dst = (unsigned short)src1;                                break;
1665	+	case IA64_INST_ZXT4: dst = (unsigned int)src1;                                  break;
1666	+	}
1667	+	inst->operands[0].commit = true;
1668	+	inst->operands[0].value  = dst;
1669	+	inst->operands[0].nat    = inst->operands[1].nat;
1670	+	break;
1671	+	case IA64_INST_LD1_UPDATE:
1672	+	case IA64_INST_LD2_UPDATE:
1673	+	case IA64_INST_LD4_UPDATE:
1674	+	case IA64_INST_LD8_UPDATE:
1675	+	inst->operands[1].commit = true;
1676	+	dst2 = inst->operands[1].value + inst->operands[2].value;
1677	+	nat2 = inst->operands[2].nat ? inst->operands[2].nat : 0;
1678	+	// fall-through
1679	+	case IA64_INST_LD1:
1680	+	case IA64_INST_LD2:
1681	+	case IA64_INST_LD4:
1682	+	case IA64_INST_LD8:
1683	+	src1 = inst->operands[1].value;
1684	+	if (inst->no_memory)
1685	+	dst = 0;
1686	+	else {
1687	+	switch (inst->mnemo) {
1688	+	case IA64_INST_LD1: case IA64_INST_LD1_UPDATE: dst = *((unsigned char *)src1);  break;
1689	+	case IA64_INST_LD2: case IA64_INST_LD2_UPDATE: dst = *((unsigned short *)src1); break;
1690	+	case IA64_INST_LD4: case IA64_INST_LD4_UPDATE: dst = *((unsigned int *)src1);   break;
1691	+	case IA64_INST_LD8: case IA64_INST_LD8_UPDATE: dst = *((unsigned long *)src1);  break;
1692	+	}
1693	+	}
1694	+	inst->operands[0].commit = true;
1695	+	inst->operands[0].value  = dst;
1696	+	inst->operands[0].nat    = 0;
1697	+	inst->operands[1].value  = dst2;
1698	+	inst->operands[1].nat    = nat2;
1699	+	break;
1700	+	case IA64_INST_ST1_UPDATE:
1701	+	case IA64_INST_ST2_UPDATE:
1702	+	case IA64_INST_ST4_UPDATE:
1703	+	case IA64_INST_ST8_UPDATE:
1704	+	inst->operands[0].commit = 0;
1705	+	dst2 = inst->operands[0].value + inst->operands[2].value;
1706	+	nat2 = inst->operands[2].nat ? inst->operands[2].nat : 0;
1707	+	// fall-through
1708	+	case IA64_INST_ST1:
1709	+	case IA64_INST_ST2:
1710	+	case IA64_INST_ST4:
1711	+	case IA64_INST_ST8:
1712	+	dst  = inst->operands[0].value;
1713	+	src1 = inst->operands[1].value;
1714	+	if (!inst->no_memory) {
1715	+	switch (inst->mnemo) {
1716	+	case IA64_INST_ST1: case IA64_INST_ST1_UPDATE: *((unsigned char *)dst) = src1;  break;
1717	+	case IA64_INST_ST2: case IA64_INST_ST2_UPDATE: *((unsigned short *)dst) = src1; break;
1718	+	case IA64_INST_ST4: case IA64_INST_ST4_UPDATE: *((unsigned int *)dst) = src1;   break;
1719	+	case IA64_INST_ST8: case IA64_INST_ST8_UPDATE: *((unsigned long *)dst) = src1;  break;
1720	+	}
1721	+	}
1722	+	inst->operands[0].value  = dst2;
1723	+	inst->operands[0].nat    = nat2;
1724	+	break;
1725	+	default:
1726	+	return false;
1727	+	}
1728	+
1729	+	for (int i = 0; i < IA64_N_OPERANDS; i++) {
1730	+	ia64_operand_t const & op = inst->operands[i];
1731	+	if (!op.commit)
1732	+	continue;
1733	+	if (op.index == -1)
1734	+	return false; // XXX: internal error
1735	+	IA64_SET_GR(op.index, op.value);
1736	+	IA64_SET_NAT(op.index, op.nat);
1737	+	}
1738	+	return true;
1739	+	}
1740	+
1741	+	static bool ia64_emulate_instruction(unsigned long raw_inst, unsigned long *ctx)
1742	+	{
1743	+	ia64_instruction_t inst;
1744	+	memset(&inst, 0, sizeof(inst));
1745	+	inst.inst = raw_inst;
1746	+	if (!ia64_decode_instruction(&inst, ctx))
1747	+	return false;
1748	+	return ia64_emulate_instruction(&inst, ctx);
1749	+	}
1750	+
1751	+	static bool ia64_skip_instruction(unsigned long *ctx)
1752	+	{
1753	+	unsigned long ip = ctx[IA64_REG_IP];
1754	+	#if DEBUG
1755	+	printf("IP: 0x%016lx\n", ip);
1756	+	#if 0
1757	+	printf(" Template 0x%02x\n", ia64_get_template(ip));
1758	+	ia64_get_instruction(ip, 0);
1759	+	ia64_get_instruction(ip, 1);
1760	+	ia64_get_instruction(ip, 2);
1761	+	#endif
1762	+	#endif
1763	+
1764	+	// Select which decode switch to use
1765	+	ia64_instruction_t inst;
1766	+	inst.inst = ia64_get_instruction(ip, ip & 3);
1767	+	if (!ia64_decode_instruction(&inst, ctx)) {
1768	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): could not decode instruction\n");
1769	+	return false;
1770	+	}
1771	+
1772	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1773	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
1774	+
1775	+	switch (inst.mnemo) {
1776	+	case IA64_INST_LD1:
1777	+	case IA64_INST_LD2:
1778	+	case IA64_INST_LD4:
1779	+	case IA64_INST_LD8:
1780	+	case IA64_INST_LD1_UPDATE:
1781	+	case IA64_INST_LD2_UPDATE:
1782	+	case IA64_INST_LD4_UPDATE:
1783	+	case IA64_INST_LD8_UPDATE:
1784	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1785	+	break;
1786	+	case IA64_INST_ST1:
1787	+	case IA64_INST_ST2:
1788	+	case IA64_INST_ST4:
1789	+	case IA64_INST_ST8:
1790	+	case IA64_INST_ST1_UPDATE:
1791	+	case IA64_INST_ST2_UPDATE:
1792	+	case IA64_INST_ST4_UPDATE:
1793	+	case IA64_INST_ST8_UPDATE:
1794	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1795	+	break;
1796	+	}
1797	+
1798	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1799	+	// Unknown machine code, let it crash. Then patch the decoder
1800	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): not a load/store instruction\n");
1801	+	return false;
1802	+	}
1803	+
1804	+	switch (inst.mnemo) {
1805	+	case IA64_INST_LD1:
1806	+	case IA64_INST_LD1_UPDATE:
1807	+	case IA64_INST_ST1:
1808	+	case IA64_INST_ST1_UPDATE:
1809	+	transfer_size = SIZE_BYTE;
1810	+	break;
1811	+	case IA64_INST_LD2:
1812	+	case IA64_INST_LD2_UPDATE:
1813	+	case IA64_INST_ST2:
1814	+	case IA64_INST_ST2_UPDATE:
1815	+	transfer_size = SIZE_WORD;
1816	+	break;
1817	+	case IA64_INST_LD4:
1818	+	case IA64_INST_LD4_UPDATE:
1819	+	case IA64_INST_ST4:
1820	+	case IA64_INST_ST4_UPDATE:
1821	+	transfer_size = SIZE_LONG;
1822	+	break;
1823	+	case IA64_INST_LD8:
1824	+	case IA64_INST_LD8_UPDATE:
1825	+	case IA64_INST_ST8:
1826	+	case IA64_INST_ST8_UPDATE:
1827	+	transfer_size = SIZE_QUAD;
1828	+	break;
1829	+	}
1830	+
1831	+	if (transfer_size == SIZE_UNKNOWN) {
1832	+	// Unknown machine code, let it crash. Then patch the decoder
1833	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): unknown transfer size\n");
1834	+	return false;
1835	+	}
1836	+
1837	+	inst.no_memory = true;
1838	+	if (!ia64_emulate_instruction(&inst, ctx)) {
1839	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): could not emulate fault instruction\n");
1840	+	return false;
1841	+	}
1842	+
1843	+	int slot = ip & 3;
1844	+	bool emulate_next = false;
1845	+	switch (slot) {
1846	+	case 0:
1847	+	switch (ia64_get_template(ip)) {
1848	+	case 0x2: // MI;I
1849	+	case 0x3: // MI;I;
1850	+	emulate_next = true;
1851	+	slot = 2;
1852	+	break;
1853	+	case 0xa: // M;MI
1854	+	case 0xb: // M;MI;
1855	+	emulate_next = true;
1856	+	slot = 1;
1857	+	break;
1858	+	}
1859	+	break;
1860	+	}
1861	+	if (emulate_next) {
1862	+	while (slot < 3) {
1863	+	if (!ia64_emulate_instruction(ia64_get_instruction(ip, slot), ctx)) {
1864	+	fprintf(stderr, "ERROR: ia64_skip_instruction(): could not emulate instruction\n");
1865	+	return false;
1866	+	}
1867	+	++slot;
1868	+	}
1869	+	}
1870	+
1871	+	ctx[IA64_REG_IP] = (ip & ~3ul) + 16;
1872	+	#if DEBUG
1873	+	printf("IP: 0x%016lx\n", ctx[IA64_REG_IP]);
1874	+	#endif
1875	+	return true;
1876	+	}
1877	+	#endif
1878	+
1879		// Decode and skip PPC instruction
1880	<	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
1881	<	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
1880	>	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__) || defined(__ppc64__))
1881	>	static bool powerpc_skip_instruction(unsigned long * nip_p, unsigned long * regs)
1882		{
1883		instruction_t instr;
1884		powerpc_decode_instruction(&instr, *nip_p, regs);
1885
1886	<	if (instr.transfer_type == TYPE_UNKNOWN) {
1886	>	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1887		// Unknown machine code, let it crash. Then patch the decoder
1888		return false;
1889		}
1890
1891		#if DEBUG
1892		printf("%08x: %s %s access", *nip_p,
1893	<	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
1894	<	instr.transfer_type == TYPE_LOAD ? "read" : "write");
1893	>	instr.transfer_size == SIZE_BYTE ? "byte" :
1894	>	instr.transfer_size == SIZE_WORD ? "word" :
1895	>	instr.transfer_size == SIZE_LONG ? "long" : "quad",
1896	>	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1897
1898		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1899		printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
1900	<	if (instr.transfer_type == TYPE_LOAD)
1900	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1901		printf(" r%d (rd = 0)\n", instr.rd);
1902		#endif
1903
1904		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1905		regs[instr.ra] = instr.addr;
1906	<	if (instr.transfer_type == TYPE_LOAD)
1906	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1907		regs[instr.rd] = 0;
1908
1909		*nip_p += 4;
1910		return true;
1911		}
1912		#endif
1913	+
1914	+	// Decode and skip MIPS instruction
1915	+	#if (defined(mips) || defined(__mips))
1916	+	static bool mips_skip_instruction(greg_t * pc_p, greg_t * regs)
1917	+	{
1918	+	unsigned int * epc = (unsigned int *)(unsigned long)*pc_p;
1919	+
1920	+	if (epc == 0)
1921	+	return false;
1922	+
1923	+	#if DEBUG
1924	+	printf("IP: %p [%08x]\n", epc, epc[0]);
1925	+	#endif
1926	+
1927	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1928	+	transfer_size_t transfer_size = SIZE_LONG;
1929	+	int direction = 0;
1930	+
1931	+	const unsigned int opcode = epc[0];
1932	+	switch (opcode >> 26) {
1933	+	case 32: // Load Byte
1934	+	case 36: // Load Byte Unsigned
1935	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1936	+	transfer_size = SIZE_BYTE;
1937	+	break;
1938	+	case 33: // Load Halfword
1939	+	case 37: // Load Halfword Unsigned
1940	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1941	+	transfer_size = SIZE_WORD;
1942	+	break;
1943	+	case 35: // Load Word
1944	+	case 39: // Load Word Unsigned
1945	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1946	+	transfer_size = SIZE_LONG;
1947	+	break;
1948	+	case 34: // Load Word Left
1949	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1950	+	transfer_size = SIZE_LONG;
1951	+	direction = -1;
1952	+	break;
1953	+	case 38: // Load Word Right
1954	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1955	+	transfer_size = SIZE_LONG;
1956	+	direction = 1;
1957	+	break;
1958	+	case 55: // Load Doubleword
1959	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1960	+	transfer_size = SIZE_QUAD;
1961	+	break;
1962	+	case 26: // Load Doubleword Left
1963	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1964	+	transfer_size = SIZE_QUAD;
1965	+	direction = -1;
1966	+	break;
1967	+	case 27: // Load Doubleword Right
1968	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1969	+	transfer_size = SIZE_QUAD;
1970	+	direction = 1;
1971	+	break;
1972	+	case 40: // Store Byte
1973	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1974	+	transfer_size = SIZE_BYTE;
1975	+	break;
1976	+	case 41: // Store Halfword
1977	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1978	+	transfer_size = SIZE_WORD;
1979	+	break;
1980	+	case 43: // Store Word
1981	+	case 42: // Store Word Left
1982	+	case 46: // Store Word Right
1983	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1984	+	transfer_size = SIZE_LONG;
1985	+	break;
1986	+	case 63: // Store Doubleword
1987	+	case 44: // Store Doubleword Left
1988	+	case 45: // Store Doubleword Right
1989	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1990	+	transfer_size = SIZE_QUAD;
1991	+	break;
1992	+	/* Misc instructions unlikely to be used within CPU emulators */
1993	+	case 48: // Load Linked Word
1994	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1995	+	transfer_size = SIZE_LONG;
1996	+	break;
1997	+	case 52: // Load Linked Doubleword
1998	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1999	+	transfer_size = SIZE_QUAD;
2000	+	break;
2001	+	case 56: // Store Conditional Word
2002	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2003	+	transfer_size = SIZE_LONG;
2004	+	break;
2005	+	case 60: // Store Conditional Doubleword
2006	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2007	+	transfer_size = SIZE_QUAD;
2008	+	break;
2009	+	}
2010	+
2011	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
2012	+	// Unknown machine code, let it crash. Then patch the decoder
2013	+	return false;
2014	+	}
2015	+
2016	+	// Zero target register in case of a load operation
2017	+	const int reg = (opcode >> 16) & 0x1f;
2018	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
2019	+	if (direction == 0)
2020	+	regs[reg] = 0;
2021	+	else {
2022	+	// FIXME: untested code
2023	+	unsigned long ea = regs[(opcode >> 21) & 0x1f];
2024	+	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
2025	+	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
2026	+	unsigned long value;
2027	+	if (direction > 0) {
2028	+	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
2029	+	value = regs[reg] & rmask;
2030	+	}
2031	+	else {
2032	+	const unsigned long lmask = (1L << (offset * 8)) - 1;
2033	+	value = regs[reg] & lmask;
2034	+	}
2035	+	// restore most significant bits
2036	+	if (transfer_size == SIZE_LONG)
2037	+	value = (signed long)(signed int)value;
2038	+	regs[reg] = value;
2039	+	}
2040	+	}
2041	+
2042	+	#if DEBUG
2043	+	#if (defined(_ABIN32) || defined(_ABI64))
2044	+	static const char * mips_gpr_names[32] = {
2045	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
2046	+	"t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
2047	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
2048	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
2049	+	};
2050	+	#else
2051	+	static const char * mips_gpr_names[32] = {
2052	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
2053	+	"a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
2054	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
2055	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
2056	+	};
2057	+	#endif
2058	+	printf("%s %s register %s\n",
2059	+	transfer_size == SIZE_BYTE ? "byte" :
2060	+	transfer_size == SIZE_WORD ? "word" :
2061	+	transfer_size == SIZE_LONG ? "long" :
2062	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
2063	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
2064	+	mips_gpr_names[reg]);
2065	+	#endif
2066	+
2067	+	*pc_p += 4;
2068	+	return true;
2069	+	}
2070	+	#endif
2071	+
2072	+	// Decode and skip SPARC instruction
2073	+	#if (defined(sparc) || defined(__sparc__))
2074	+	enum {
2075	+	#if (defined(__sun__))
2076	+	SPARC_REG_G1 = REG_G1,
2077	+	SPARC_REG_O0 = REG_O0,
2078	+	SPARC_REG_PC = REG_PC,
2079	+	SPARC_REG_nPC = REG_nPC
2080	+	#endif
2081	+	};
2082	+	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
2083	+	{
2084	+	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
2085	+
2086	+	if (pc == 0)
2087	+	return false;
2088	+
2089	+	#if DEBUG
2090	+	printf("IP: %p [%08x]\n", pc, pc[0]);
2091	+	#endif
2092	+
2093	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
2094	+	transfer_size_t transfer_size = SIZE_LONG;
2095	+	bool register_pair = false;
2096	+
2097	+	const unsigned int opcode = pc[0];
2098	+	if ((opcode >> 30) != 3)
2099	+	return false;
2100	+	switch ((opcode >> 19) & 0x3f) {
2101	+	case 9: // Load Signed Byte
2102	+	case 1: // Load Unsigned Byte
2103	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2104	+	transfer_size = SIZE_BYTE;
2105	+	break;
2106	+	case 10:// Load Signed Halfword
2107	+	case 2: // Load Unsigned Word
2108	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2109	+	transfer_size = SIZE_WORD;
2110	+	break;
2111	+	case 8: // Load Word
2112	+	case 0: // Load Unsigned Word
2113	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2114	+	transfer_size = SIZE_LONG;
2115	+	break;
2116	+	case 11:// Load Extended Word
2117	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2118	+	transfer_size = SIZE_QUAD;
2119	+	break;
2120	+	case 3: // Load Doubleword
2121	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2122	+	transfer_size = SIZE_LONG;
2123	+	register_pair = true;
2124	+	break;
2125	+	case 5: // Store Byte
2126	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2127	+	transfer_size = SIZE_BYTE;
2128	+	break;
2129	+	case 6: // Store Halfword
2130	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2131	+	transfer_size = SIZE_WORD;
2132	+	break;
2133	+	case 4: // Store Word
2134	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2135	+	transfer_size = SIZE_LONG;
2136	+	break;
2137	+	case 14:// Store Extended Word
2138	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2139	+	transfer_size = SIZE_QUAD;
2140	+	break;
2141	+	case 7: // Store Doubleword
2142	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2143	+	transfer_size = SIZE_LONG;
2144	+	register_pair = true;
2145	+	break;
2146	+	}
2147	+
2148	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
2149	+	// Unknown machine code, let it crash. Then patch the decoder
2150	+	return false;
2151	+	}
2152	+
2153	+	const int reg = (opcode >> 25) & 0x1f;
2154	+
2155	+	#if DEBUG
2156	+	static const char * reg_names[] = {
2157	+	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
2158	+	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
2159	+	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
2160	+	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
2161	+	};
2162	+	printf("%s %s register %s\n",
2163	+	transfer_size == SIZE_BYTE ? "byte" :
2164	+	transfer_size == SIZE_WORD ? "word" :
2165	+	transfer_size == SIZE_LONG ? "long" :
2166	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
2167	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
2168	+	reg_names[reg]);
2169	+	#endif
2170	+
2171	+	// Zero target register in case of a load operation
2172	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
2173	+	// FIXME: code to handle local & input registers is not tested
2174	+	if (reg >= 1 && reg < 8) {
2175	+	// global registers
2176	+	regs[reg - 1 + SPARC_REG_G1] = 0;
2177	+	}
2178	+	else if (reg >= 8 && reg < 16) {
2179	+	// output registers
2180	+	regs[reg - 8 + SPARC_REG_O0] = 0;
2181	+	}
2182	+	else if (reg >= 16 && reg < 24) {
2183	+	// local registers (in register windows)
2184	+	if (gwins)
2185	+	gwins->wbuf->rw_local[reg - 16] = 0;
2186	+	else
2187	+	rwin->rw_local[reg - 16] = 0;
2188	+	}
2189	+	else {
2190	+	// input registers (in register windows)
2191	+	if (gwins)
2192	+	gwins->wbuf->rw_in[reg - 24] = 0;
2193	+	else
2194	+	rwin->rw_in[reg - 24] = 0;
2195	+	}
2196	+	}
2197	+
2198	+	regs[SPARC_REG_PC] += 4;
2199	+	regs[SPARC_REG_nPC] += 4;
2200	+	return true;
2201	+	}
2202	+	#endif
2203		#endif
2204
2205	+	// Decode and skip ARM instruction
2206	+	#if (defined(arm) || defined(__arm__))
2207	+	enum {
2208	+	#if (defined(__linux__))
2209	+	ARM_REG_PC = 15,
2210	+	ARM_REG_CPSR = 16
2211	+	#endif
2212	+	};
2213	+	static bool arm_skip_instruction(unsigned long * regs)
2214	+	{
2215	+	unsigned int * pc = (unsigned int *)regs[ARM_REG_PC];
2216	+
2217	+	if (pc == 0)
2218	+	return false;
2219	+
2220	+	#if DEBUG
2221	+	printf("IP: %p [%08x]\n", pc, pc[0]);
2222	+	#endif
2223	+
2224	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
2225	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
2226	+	enum { op_sdt = 1, op_sdth = 2 };
2227	+	int op = 0;
2228	+
2229	+	// Handle load/store instructions only
2230	+	const unsigned int opcode = pc[0];
2231	+	switch ((opcode >> 25) & 7) {
2232	+	case 0: // Halfword and Signed Data Transfer (LDRH, STRH, LDRSB, LDRSH)
2233	+	op = op_sdth;
2234	+	// Determine transfer size (S/H bits)
2235	+	switch ((opcode >> 5) & 3) {
2236	+	case 0: // SWP instruction
2237	+	break;
2238	+	case 1: // Unsigned halfwords
2239	+	case 3: // Signed halfwords
2240	+	transfer_size = SIZE_WORD;
2241	+	break;
2242	+	case 2: // Signed byte
2243	+	transfer_size = SIZE_BYTE;
2244	+	break;
2245	+	}
2246	+	break;
2247	+	case 2:
2248	+	case 3: // Single Data Transfer (LDR, STR)
2249	+	op = op_sdt;
2250	+	// Determine transfer size (B bit)
2251	+	if (((opcode >> 22) & 1) == 1)
2252	+	transfer_size = SIZE_BYTE;
2253	+	else
2254	+	transfer_size = SIZE_LONG;
2255	+	break;
2256	+	default:
2257	+	// FIXME: support load/store mutliple?
2258	+	return false;
2259	+	}
2260	+
2261	+	// Check for invalid transfer size (SWP instruction?)
2262	+	if (transfer_size == SIZE_UNKNOWN)
2263	+	return false;
2264	+
2265	+	// Determine transfer type (L bit)
2266	+	if (((opcode >> 20) & 1) == 1)
2267	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
2268	+	else
2269	+	transfer_type = SIGSEGV_TRANSFER_STORE;
2270	+
2271	+	// Compute offset
2272	+	int offset;
2273	+	if (((opcode >> 25) & 1) == 0) {
2274	+	if (op == op_sdt)
2275	+	offset = opcode & 0xfff;
2276	+	else if (op == op_sdth) {
2277	+	int rm = opcode & 0xf;
2278	+	if (((opcode >> 22) & 1) == 0) {
2279	+	// register offset
2280	+	offset = regs[rm];
2281	+	}
2282	+	else {
2283	+	// immediate offset
2284	+	offset = ((opcode >> 4) & 0xf0) | (opcode & 0x0f);
2285	+	}
2286	+	}
2287	+	}
2288	+	else {
2289	+	const int rm = opcode & 0xf;
2290	+	const int sh = (opcode >> 7) & 0x1f;
2291	+	if (((opcode >> 4) & 1) == 1) {
2292	+	// we expect only legal load/store instructions
2293	+	printf("FATAL: invalid shift operand\n");
2294	+	return false;
2295	+	}
2296	+	const unsigned int v = regs[rm];
2297	+	switch ((opcode >> 5) & 3) {
2298	+	case 0: // logical shift left
2299	+	offset = sh ? v << sh : v;
2300	+	break;
2301	+	case 1: // logical shift right
2302	+	offset = sh ? v >> sh : 0;
2303	+	break;
2304	+	case 2: // arithmetic shift right
2305	+	if (sh)
2306	+	offset = ((signed int)v) >> sh;
2307	+	else
2308	+	offset = (v & 0x80000000) ? 0xffffffff : 0;
2309	+	break;
2310	+	case 3: // rotate right
2311	+	if (sh)
2312	+	offset = (v >> sh) | (v << (32 - sh));
2313	+	else
2314	+	offset = (v >> 1) | ((regs[ARM_REG_CPSR] << 2) & 0x80000000);
2315	+	break;
2316	+	}
2317	+	}
2318	+	if (((opcode >> 23) & 1) == 0)
2319	+	offset = -offset;
2320	+
2321	+	int rd = (opcode >> 12) & 0xf;
2322	+	int rn = (opcode >> 16) & 0xf;
2323	+	#if DEBUG
2324	+	static const char * reg_names[] = {
2325	+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
2326	+	"r9", "r9", "sl", "fp", "ip", "sp", "lr", "pc"
2327	+	};
2328	+	printf("%s %s register %s\n",
2329	+	transfer_size == SIZE_BYTE ? "byte" :
2330	+	transfer_size == SIZE_WORD ? "word" :
2331	+	transfer_size == SIZE_LONG ? "long" : "unknown",
2332	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
2333	+	reg_names[rd]);
2334	+	#endif
2335	+
2336	+	unsigned int base = regs[rn];
2337	+	if (((opcode >> 24) & 1) == 1)
2338	+	base += offset;
2339	+
2340	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD)
2341	+	regs[rd] = 0;
2342	+
2343	+	if (((opcode >> 24) & 1) == 0)                // post-index addressing
2344	+	regs[rn] += offset;
2345	+	else if (((opcode >> 21) & 1) == 1)   // write-back address into base
2346	+	regs[rn] = base;
2347	+
2348	+	regs[ARM_REG_PC] += 4;
2349	+	return true;
2350	+	}
2351	+	#endif
2352	+
2353	+
2354		// Fallbacks
2355	+	#ifndef SIGSEGV_FAULT_ADDRESS_FAST
2356	+	#define SIGSEGV_FAULT_ADDRESS_FAST              SIGSEGV_FAULT_ADDRESS
2357	+	#endif
2358	+	#ifndef SIGSEGV_FAULT_INSTRUCTION_FAST
2359	+	#define SIGSEGV_FAULT_INSTRUCTION_FAST  SIGSEGV_FAULT_INSTRUCTION
2360	+	#endif
2361		#ifndef SIGSEGV_FAULT_INSTRUCTION
2362	<	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
2362	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_ADDRESS
2363	>	#endif
2364	>	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
2365	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
2366	>	#endif
2367	>	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
2368	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(P) sigsegv_fault_handler(P)
2369		#endif
2370
2371		// SIGSEGV recovery supported ?
#	Line 629 | Line 2378 | static bool powerpc_skip_instruction(uns
2378		*  SIGSEGV global handler
2379		*/
2380
2381	+	struct sigsegv_info_t {
2382	+	sigsegv_address_t addr;
2383	+	sigsegv_address_t pc;
2384	+	#ifdef HAVE_MACH_EXCEPTIONS
2385	+	mach_port_t thread;
2386	+	bool has_exc_state;
2387	+	SIGSEGV_EXCEPTION_STATE_TYPE exc_state;
2388	+	mach_msg_type_number_t exc_state_count;
2389	+	bool has_thr_state;
2390	+	SIGSEGV_THREAD_STATE_TYPE thr_state;
2391	+	mach_msg_type_number_t thr_state_count;
2392	+	#endif
2393	+	};
2394	+
2395	+	#ifdef HAVE_MACH_EXCEPTIONS
2396	+	static void mach_get_exception_state(sigsegv_info_t *SIP)
2397	+	{
2398	+	SIP->exc_state_count = SIGSEGV_EXCEPTION_STATE_COUNT;
2399	+	kern_return_t krc = thread_get_state(SIP->thread,
2400	+	SIGSEGV_EXCEPTION_STATE_FLAVOR,
2401	+	(natural_t *)&SIP->exc_state,
2402	+	&SIP->exc_state_count);
2403	+	MACH_CHECK_ERROR(thread_get_state, krc);
2404	+	SIP->has_exc_state = true;
2405	+	}
2406	+
2407	+	static void mach_get_thread_state(sigsegv_info_t *SIP)
2408	+	{
2409	+	SIP->thr_state_count = SIGSEGV_THREAD_STATE_COUNT;
2410	+	kern_return_t krc = thread_get_state(SIP->thread,
2411	+	SIGSEGV_THREAD_STATE_FLAVOR,
2412	+	(natural_t *)&SIP->thr_state,
2413	+	&SIP->thr_state_count);
2414	+	MACH_CHECK_ERROR(thread_get_state, krc);
2415	+	SIP->has_thr_state = true;
2416	+	}
2417	+
2418	+	static void mach_set_thread_state(sigsegv_info_t *SIP)
2419	+	{
2420	+	kern_return_t krc = thread_set_state(SIP->thread,
2421	+	SIGSEGV_THREAD_STATE_FLAVOR,
2422	+	(natural_t *)&SIP->thr_state,
2423	+	SIP->thr_state_count);
2424	+	MACH_CHECK_ERROR(thread_set_state, krc);
2425	+	}
2426	+	#endif
2427	+
2428	+	// Return the address of the invalid memory reference
2429	+	sigsegv_address_t sigsegv_get_fault_address(sigsegv_info_t *SIP)
2430	+	{
2431	+	#ifdef HAVE_MACH_EXCEPTIONS
2432	+	static int use_fast_path = -1;
2433	+	if (use_fast_path != 1 && !SIP->has_exc_state) {
2434	+	mach_get_exception_state(SIP);
2435	+
2436	+	sigsegv_address_t addr = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
2437	+	if (use_fast_path < 0)
2438	+	use_fast_path = addr == SIP->addr;
2439	+	SIP->addr = addr;
2440	+	}
2441	+	#endif
2442	+	return SIP->addr;
2443	+	}
2444	+
2445	+	// Return the address of the instruction that caused the fault, or
2446	+	// SIGSEGV_INVALID_ADDRESS if we could not retrieve this information
2447	+	sigsegv_address_t sigsegv_get_fault_instruction_address(sigsegv_info_t *SIP)
2448	+	{
2449	+	#ifdef HAVE_MACH_EXCEPTIONS
2450	+	if (!SIP->has_thr_state) {
2451	+	mach_get_thread_state(SIP);
2452	+
2453	+	SIP->pc = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
2454	+	}
2455	+	#endif
2456	+	return SIP->pc;
2457	+	}
2458	+
2459	+	// This function handles the badaccess to memory.
2460	+	// It is called from the signal handler or the exception handler.
2461	+	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
2462	+	{
2463	+	sigsegv_info_t SI;
2464	+	SI.addr = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS_FAST;
2465	+	SI.pc = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION_FAST;
2466	+	#ifdef HAVE_MACH_EXCEPTIONS
2467	+	SI.thread = thread;
2468	+	SI.has_exc_state = false;
2469	+	SI.has_thr_state = false;
2470	+	#endif
2471	+	sigsegv_info_t * const SIP = &SI;
2472	+
2473	+	// Call user's handler and reinstall the global handler, if required
2474	+	switch (SIGSEGV_FAULT_HANDLER_INVOKE(SIP)) {
2475	+	case SIGSEGV_RETURN_SUCCESS:
2476	+	return true;
2477	+
2478	+	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
2479	+	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
2480	+	// Call the instruction skipper with the register file
2481	+	// available
2482	+	#ifdef HAVE_MACH_EXCEPTIONS
2483	+	if (!SIP->has_thr_state)
2484	+	mach_get_thread_state(SIP);
2485	+	#endif
2486	+	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
2487	+	#ifdef HAVE_MACH_EXCEPTIONS
2488	+	// Unlike UNIX signals where the thread state
2489	+	// is modified off of the stack, in Mach we
2490	+	// need to actually call thread_set_state to
2491	+	// have the register values updated.
2492	+	mach_set_thread_state(SIP);
2493	+	#endif
2494	+	return true;
2495	+	}
2496	+	break;
2497	+	#endif
2498	+	case SIGSEGV_RETURN_FAILURE:
2499	+	// We can't do anything with the fault_address, dump state?
2500	+	if (sigsegv_state_dumper != 0)
2501	+	sigsegv_state_dumper(SIP);
2502	+	break;
2503	+	}
2504	+
2505	+	return false;
2506	+	}
2507	+
2508	+
2509	+	/*
2510	+	* There are two mechanisms for handling a bad memory access,
2511	+	* Mach exceptions and UNIX signals. The implementation specific
2512	+	* code appears below. Its reponsibility is to call handle_badaccess
2513	+	* which is the routine that handles the fault in an implementation
2514	+	* agnostic manner. The implementation specific code below is then
2515	+	* reponsible for checking whether handle_badaccess was able
2516	+	* to handle the memory access error and perform any implementation
2517	+	* specific tasks necessary afterwards.
2518	+	*/
2519	+
2520	+	#ifdef HAVE_MACH_EXCEPTIONS
2521	+	/*
2522	+	* We need to forward all exceptions that we do not handle.
2523	+	* This is important, there are many exceptions that may be
2524	+	* handled by other exception handlers. For example debuggers
2525	+	* use exceptions and the exception hander is in another
2526	+	* process in such a case. (Timothy J. Wood states in his
2527	+	* message to the list that he based this code on that from
2528	+	* gdb for Darwin.)
2529	+	*/
2530	+	static inline kern_return_t
2531	+	forward_exception(mach_port_t thread_port,
2532	+	mach_port_t task_port,
2533	+	exception_type_t exception_type,
2534	+	exception_data_t exception_data,
2535	+	mach_msg_type_number_t data_count,
2536	+	ExceptionPorts *oldExceptionPorts)
2537	+	{
2538	+	kern_return_t kret;
2539	+	unsigned int portIndex;
2540	+	mach_port_t port;
2541	+	exception_behavior_t behavior;
2542	+	thread_state_flavor_t flavor;
2543	+	thread_state_data_t thread_state;
2544	+	mach_msg_type_number_t thread_state_count;
2545	+
2546	+	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
2547	+	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
2548	+	// This handler wants the exception
2549	+	break;
2550	+	}
2551	+	}
2552	+
2553	+	if (portIndex >= oldExceptionPorts->maskCount) {
2554	+	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
2555	+	return KERN_FAILURE;
2556	+	}
2557	+
2558	+	port = oldExceptionPorts->handlers[portIndex];
2559	+	behavior = oldExceptionPorts->behaviors[portIndex];
2560	+	flavor = oldExceptionPorts->flavors[portIndex];
2561	+
2562	+	if (!VALID_THREAD_STATE_FLAVOR(flavor)) {
2563	+	fprintf(stderr, "Invalid thread_state flavor = %d. Not forwarding\n", flavor);
2564	+	return KERN_FAILURE;
2565	+	}
2566	+
2567	+	/*
2568	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
2569	+	*/
2570	+
2571	+	if (behavior != EXCEPTION_DEFAULT) {
2572	+	thread_state_count = THREAD_STATE_MAX;
2573	+	kret = thread_get_state (thread_port, flavor, (natural_t *)&thread_state,
2574	+	&thread_state_count);
2575	+	MACH_CHECK_ERROR (thread_get_state, kret);
2576	+	}
2577	+
2578	+	switch (behavior) {
2579	+	case EXCEPTION_DEFAULT:
2580	+	// fprintf(stderr, "forwarding to exception_raise\n");
2581	+	kret = exception_raise(port, thread_port, task_port, exception_type,
2582	+	exception_data, data_count);
2583	+	MACH_CHECK_ERROR (exception_raise, kret);
2584	+	break;
2585	+	case EXCEPTION_STATE:
2586	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
2587	+	kret = exception_raise_state(port, exception_type, exception_data,
2588	+	data_count, &flavor,
2589	+	(natural_t *)&thread_state, thread_state_count,
2590	+	(natural_t *)&thread_state, &thread_state_count);
2591	+	MACH_CHECK_ERROR (exception_raise_state, kret);
2592	+	break;
2593	+	case EXCEPTION_STATE_IDENTITY:
2594	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
2595	+	kret = exception_raise_state_identity(port, thread_port, task_port,
2596	+	exception_type, exception_data,
2597	+	data_count, &flavor,
2598	+	(natural_t *)&thread_state, thread_state_count,
2599	+	(natural_t *)&thread_state, &thread_state_count);
2600	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
2601	+	break;
2602	+	default:
2603	+	fprintf(stderr, "forward_exception got unknown behavior\n");
2604	+	kret = KERN_FAILURE;
2605	+	break;
2606	+	}
2607	+
2608	+	if (behavior != EXCEPTION_DEFAULT) {
2609	+	kret = thread_set_state (thread_port, flavor, (natural_t *)&thread_state,
2610	+	thread_state_count);
2611	+	MACH_CHECK_ERROR (thread_set_state, kret);
2612	+	}
2613	+
2614	+	return kret;
2615	+	}
2616	+
2617	+	/*
2618	+	* This is the code that actually handles the exception.
2619	+	* It is called by exc_server. For Darwin 5 Apple changed
2620	+	* this a bit from how this family of functions worked in
2621	+	* Mach. If you are familiar with that it is a little
2622	+	* different. The main variation that concerns us here is
2623	+	* that code is an array of exception specific codes and
2624	+	* codeCount is a count of the number of codes in the code
2625	+	* array. In typical Mach all exceptions have a code
2626	+	* and sub-code. It happens to be the case that for a
2627	+	* EXC_BAD_ACCESS exception the first entry is the type of
2628	+	* bad access that occurred and the second entry is the
2629	+	* faulting address so these entries correspond exactly to
2630	+	* how the code and sub-code are used on Mach.
2631	+	*
2632	+	* This is a MIG interface. No code in Basilisk II should
2633	+	* call this directley. This has to have external C
2634	+	* linkage because that is what exc_server expects.
2635	+	*/
2636	+	kern_return_t
2637	+	catch_exception_raise(mach_port_t exception_port,
2638	+	mach_port_t thread,
2639	+	mach_port_t task,
2640	+	exception_type_t exception,
2641	+	exception_data_t code,
2642	+	mach_msg_type_number_t code_count)
2643	+	{
2644	+	kern_return_t krc;
2645	+
2646	+	if (exception == EXC_BAD_ACCESS) {
2647	+	switch (code[0]) {
2648	+	case KERN_PROTECTION_FAILURE:
2649	+	case KERN_INVALID_ADDRESS:
2650	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
2651	+	return KERN_SUCCESS;
2652	+	break;
2653	+	}
2654	+	}
2655	+
2656	+	// In Mach we do not need to remove the exception handler.
2657	+	// If we forward the exception, eventually some exception handler
2658	+	// will take care of this exception.
2659	+	krc = forward_exception(thread, task, exception, code, code_count, &ports);
2660	+
2661	+	return krc;
2662	+	}
2663	+	#endif
2664	+
2665		#ifdef HAVE_SIGSEGV_RECOVERY
2666	+	// Handle bad memory accesses with signal handler
2667		static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
2668		{
2669	<	sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
2670	<	sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
637	<	bool fault_recovered = false;
638	<
639	<	// Call user's handler and reinstall the global handler, if required
640	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
2669	>	// Call handler and reinstall the global handler, if required
2670	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
2671		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
2672		sigsegv_do_install_handler(sig);
2673		#endif
2674	<	fault_recovered = true;
645	<	}
646	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
647	<	else if (sigsegv_ignore_fault) {
648	<	// Call the instruction skipper with the register file available
649	<	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
650	<	fault_recovered = true;
2674	>	return;
2675		}
652	–	#endif
2676
2677	<	if (!fault_recovered) {
655	<	// FAIL: reinstall default handler for "safe" crash
2677	>	// Failure: reinstall default handler for "safe" crash
2678		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
2679	<	SIGSEGV_ALL_SIGNALS
2679	>	SIGSEGV_ALL_SIGNALS
2680		#undef FAULT_HANDLER
659	–
660	–	// We can't do anything with the fault_address, dump state?
661	–	if (sigsegv_state_dumper != 0)
662	–	sigsegv_state_dumper(fault_address, fault_instruction);
663	–	}
2681		}
2682		#endif
2683
#	Line 674 | Line 2691 | static bool sigsegv_do_install_handler(i
2691		{
2692		// Setup SIGSEGV handler to process writes to frame buffer
2693		#ifdef HAVE_SIGACTION
2694	<	struct sigaction vosf_sa;
2695	<	sigemptyset(&vosf_sa.sa_mask);
2696	<	vosf_sa.sa_sigaction = sigsegv_handler;
2697	<	vosf_sa.sa_flags = SA_SIGINFO;
2698	<	return (sigaction(sig, &vosf_sa, 0) == 0);
2694	>	struct sigaction sigsegv_sa;
2695	>	sigemptyset(&sigsegv_sa.sa_mask);
2696	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
2697	>	sigsegv_sa.sa_flags = SA_SIGINFO;
2698	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
2699		#else
2700		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
2701		#endif
#	Line 690 | Line 2707 | static bool sigsegv_do_install_handler(i
2707		{
2708		// Setup SIGSEGV handler to process writes to frame buffer
2709		#ifdef HAVE_SIGACTION
2710	<	struct sigaction vosf_sa;
2711	<	sigemptyset(&vosf_sa.sa_mask);
2712	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
2710	>	struct sigaction sigsegv_sa;
2711	>	sigemptyset(&sigsegv_sa.sa_mask);
2712	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
2713	>	sigsegv_sa.sa_flags = 0;
2714		#if !EMULATED_68K && defined(__NetBSD__)
2715	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
2716	<	vosf_sa.sa_flags = SA_ONSTACK;
699	<	#else
700	<	vosf_sa.sa_flags = 0;
2715	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
2716	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
2717		#endif
2718	<	return (sigaction(sig, &vosf_sa, 0) == 0);
2718	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
2719		#else
2720		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
2721		#endif
2722		}
2723		#endif
2724
2725	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
2725	>	#if defined(HAVE_MACH_EXCEPTIONS)
2726	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
2727		{
2728	<	#ifdef HAVE_SIGSEGV_RECOVERY
2728	>	/*
2729	>	* Except for the exception port functions, this should be
2730	>	* pretty much stock Mach. If later you choose to support
2731	>	* other Mach's besides Darwin, just check for __MACH__
2732	>	* here and __APPLE__ where the actual differences are.
2733	>	*/
2734	>	#if defined(__APPLE__) && defined(__MACH__)
2735	>	if (sigsegv_fault_handler != NULL) {
2736	>	sigsegv_fault_handler = handler;
2737	>	return true;
2738	>	}
2739	>
2740	>	kern_return_t krc;
2741	>
2742	>	// create the the exception port
2743	>	krc = mach_port_allocate(mach_task_self(),
2744	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
2745	>	if (krc != KERN_SUCCESS) {
2746	>	mach_error("mach_port_allocate", krc);
2747	>	return false;
2748	>	}
2749	>
2750	>	// add a port send right
2751	>	krc = mach_port_insert_right(mach_task_self(),
2752	>	_exceptionPort, _exceptionPort,
2753	>	MACH_MSG_TYPE_MAKE_SEND);
2754	>	if (krc != KERN_SUCCESS) {
2755	>	mach_error("mach_port_insert_right", krc);
2756	>	return false;
2757	>	}
2758	>
2759	>	// get the old exception ports
2760	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
2761	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
2762	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
2763	>	if (krc != KERN_SUCCESS) {
2764	>	mach_error("thread_get_exception_ports", krc);
2765	>	return false;
2766	>	}
2767	>
2768	>	// set the new exception port
2769	>	//
2770	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
2771	>	// EXCEPTION_DEFAULT to get the thread state in the initial
2772	>	// message, but it turns out that in the common case this is not
2773	>	// neccessary. If we need it we can later ask for it from the
2774	>	// suspended thread.
2775	>	//
2776	>	// Even with THREAD_STATE_NONE, Darwin provides the program
2777	>	// counter in the thread state.  The comments in the header file
2778	>	// seem to imply that you can count on the GPR's on an exception
2779	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
2780	>	// you have to ask for all of the GPR's anyway just to get the
2781	>	// program counter. In any case because of update effective
2782	>	// address from immediate and update address from effective
2783	>	// addresses of ra and rb modes (as good an name as any for these
2784	>	// addressing modes) used in PPC instructions, you will need the
2785	>	// GPR state anyway.
2786	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
2787	>	EXCEPTION_DEFAULT, SIGSEGV_THREAD_STATE_FLAVOR);
2788	>	if (krc != KERN_SUCCESS) {
2789	>	mach_error("thread_set_exception_ports", krc);
2790	>	return false;
2791	>	}
2792	>
2793	>	// create the exception handler thread
2794	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
2795	>	(void)fprintf(stderr, "creation of exception thread failed\n");
2796	>	return false;
2797	>	}
2798	>
2799	>	// do not care about the exception thread any longer, let is run standalone
2800	>	(void)pthread_detach(exc_thread);
2801	>
2802		sigsegv_fault_handler = handler;
2803	+	return true;
2804	+	#else
2805	+	return false;
2806	+	#endif
2807	+	}
2808	+	#endif
2809	+
2810	+	#ifdef HAVE_WIN32_EXCEPTIONS
2811	+	static LONG WINAPI main_exception_filter(EXCEPTION_POINTERS *ExceptionInfo)
2812	+	{
2813	+	if (sigsegv_fault_handler != NULL
2814	+	&& ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
2815	+	&& ExceptionInfo->ExceptionRecord->NumberParameters == 2
2816	+	&& handle_badaccess(ExceptionInfo))
2817	+	return EXCEPTION_CONTINUE_EXECUTION;
2818	+
2819	+	return EXCEPTION_CONTINUE_SEARCH;
2820	+	}
2821	+
2822	+	#if defined __CYGWIN__ && defined __i386__
2823	+	/* In Cygwin programs, SetUnhandledExceptionFilter has no effect because Cygwin
2824	+	installs a global exception handler.  We have to dig deep in order to install
2825	+	our main_exception_filter.  */
2826	+
2827	+	/* Data structures for the current thread's exception handler chain.
2828	+	On the x86 Windows uses register fs, offset 0 to point to the current
2829	+	exception handler; Cygwin mucks with it, so we must do the same... :-/ */
2830	+
2831	+	/* Magic taken from winsup/cygwin/include/exceptions.h.  */
2832	+
2833	+	struct exception_list {
2834	+	struct exception_list *prev;
2835	+	int (*handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
2836	+	};
2837	+	typedef struct exception_list exception_list;
2838	+
2839	+	/* Magic taken from winsup/cygwin/exceptions.cc.  */
2840	+
2841	+	__asm__ (".equ __except_list,0");
2842	+
2843	+	extern exception_list *_except_list __asm__ ("%fs:__except_list");
2844	+
2845	+	/* For debugging.  _except_list is not otherwise accessible from gdb.  */
2846	+	static exception_list *
2847	+	debug_get_except_list ()
2848	+	{
2849	+	return _except_list;
2850	+	}
2851	+
2852	+	/* Cygwin's original exception handler.  */
2853	+	static int (*cygwin_exception_handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
2854	+
2855	+	/* Our exception handler.  */
2856	+	static int
2857	+	libsigsegv_exception_handler (EXCEPTION_RECORD *exception, void *frame, CONTEXT *context, void *dispatch)
2858	+	{
2859	+	EXCEPTION_POINTERS ExceptionInfo;
2860	+	ExceptionInfo.ExceptionRecord = exception;
2861	+	ExceptionInfo.ContextRecord = context;
2862	+	if (main_exception_filter (&ExceptionInfo) == EXCEPTION_CONTINUE_SEARCH)
2863	+	return cygwin_exception_handler (exception, frame, context, dispatch);
2864	+	else
2865	+	return 0;
2866	+	}
2867	+
2868	+	static void
2869	+	do_install_main_exception_filter ()
2870	+	{
2871	+	/* We cannot insert any handler into the chain, because such handlers
2872	+	must lie on the stack (?).  Instead, we have to replace(!) Cygwin's
2873	+	global exception handler.  */
2874	+	cygwin_exception_handler = _except_list->handler;
2875	+	_except_list->handler = libsigsegv_exception_handler;
2876	+	}
2877	+
2878	+	#else
2879	+
2880	+	static void
2881	+	do_install_main_exception_filter ()
2882	+	{
2883	+	SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) &main_exception_filter);
2884	+	}
2885	+	#endif
2886	+
2887	+	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
2888	+	{
2889	+	static bool main_exception_filter_installed = false;
2890	+	if (!main_exception_filter_installed) {
2891	+	do_install_main_exception_filter();
2892	+	main_exception_filter_installed = true;
2893	+	}
2894	+	sigsegv_fault_handler = handler;
2895	+	return true;
2896	+	}
2897	+	#endif
2898	+
2899	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
2900	+	{
2901	+	#if defined(HAVE_SIGSEGV_RECOVERY)
2902		bool success = true;
2903		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
2904		SIGSEGV_ALL_SIGNALS
2905		#undef FAULT_HANDLER
2906	+	if (success)
2907	+	sigsegv_fault_handler = handler;
2908		return success;
2909	+	#elif defined(HAVE_MACH_EXCEPTIONS) || defined(HAVE_WIN32_EXCEPTIONS)
2910	+	return sigsegv_do_install_handler(handler);
2911		#else
2912		// FAIL: no siginfo_t nor sigcontext subterfuge is available
2913		return false;
#	Line 728 | Line 2921 | bool sigsegv_install_handler(sigsegv_fau
2921
2922		void sigsegv_deinstall_handler(void)
2923		{
2924	+	// We do nothing for Mach exceptions, the thread would need to be
2925	+	// suspended if not already so, and we might mess with other
2926	+	// exception handlers that came after we registered ours. There is
2927	+	// no need to remove the exception handler, in fact this function is
2928	+	// not called anywhere in Basilisk II.
2929		#ifdef HAVE_SIGSEGV_RECOVERY
2930		sigsegv_fault_handler = 0;
2931		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
2932		SIGSEGV_ALL_SIGNALS
2933		#undef FAULT_HANDLER
2934		#endif
2935	<	}
2936	<
2937	<
740	<	/*
741	<	*  SIGSEGV ignore state modifier
742	<	*/
743	<
744	<	void sigsegv_set_ignore_state(bool ignore_fault)
745	<	{
746	<	sigsegv_ignore_fault = ignore_fault;
2935	>	#ifdef HAVE_WIN32_EXCEPTIONS
2936	>	sigsegv_fault_handler = NULL;
2937	>	#endif
2938		}
2939
2940
#	Line 765 | Line 2956 | void sigsegv_set_dump_state(sigsegv_stat
2956		#include <stdio.h>
2957		#include <stdlib.h>
2958		#include <fcntl.h>
2959	+	#ifdef HAVE_SYS_MMAN_H
2960		#include <sys/mman.h>
2961	+	#endif
2962		#include "vm_alloc.h"
2963
2964	+	const int REF_INDEX = 123;
2965	+	const int REF_VALUE = 45;
2966	+
2967		static int page_size;
2968		static volatile char * page = 0;
2969		static volatile int handler_called = 0;
2970
2971	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2971	>	/* Barriers */
2972	>	#ifdef __GNUC__
2973	>	#define BARRIER() asm volatile ("" : : : "memory")
2974	>	#else
2975	>	#define BARRIER() /* nothing */
2976	>	#endif
2977	>
2978	>	#ifdef __GNUC__
2979	>	// Code range where we expect the fault to come from
2980	>	static void *b_region, *e_region;
2981	>	#endif
2982	>
2983	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_info_t *sip)
2984		{
2985	+	const sigsegv_address_t fault_address = sigsegv_get_fault_address(sip);
2986	+	const sigsegv_address_t instruction_address = sigsegv_get_fault_instruction_address(sip);
2987	+	#if DEBUG
2988	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
2989	+	printf("expected fault at %p\n", page + REF_INDEX);
2990	+	#ifdef __GNUC__
2991	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
2992	+	#endif
2993	+	#endif
2994		handler_called++;
2995	<	if ((fault_address - 123) != page)
2996	<	exit(1);
2995	>	if ((fault_address - REF_INDEX) != page)
2996	>	exit(10);
2997	>	#ifdef __GNUC__
2998	>	// Make sure reported fault instruction address falls into
2999	>	// expected code range
3000	>	if (instruction_address != SIGSEGV_INVALID_ADDRESS
3001	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
3002	>	(instruction_address >= (sigsegv_address_t)e_region)))
3003	>	exit(11);
3004	>	#endif
3005		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
3006	<	exit(1);
3007	<	return true;
3006	>	exit(12);
3007	>	return SIGSEGV_RETURN_SUCCESS;
3008		}
3009
3010		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
3011	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
3011	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_info_t *sip)
3012		{
3013	<	return false;
3013	>	const sigsegv_address_t fault_address = sigsegv_get_fault_address(sip);
3014	>	const sigsegv_address_t instruction_address = sigsegv_get_fault_instruction_address(sip);
3015	>	#if DEBUG
3016	>	printf("sigsegv_insn_handler(%p, %p)\n", fault_address, instruction_address);
3017	>	#endif
3018	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
3019	>	#ifdef __GNUC__
3020	>	// Make sure reported fault instruction address falls into
3021	>	// expected code range
3022	>	if (instruction_address != SIGSEGV_INVALID_ADDRESS
3023	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
3024	>	(instruction_address >= (sigsegv_address_t)e_region)))
3025	>	return SIGSEGV_RETURN_FAILURE;
3026	>	#endif
3027	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
3028	>	}
3029	>
3030	>	return SIGSEGV_RETURN_FAILURE;
3031	>	}
3032	>
3033	>	// More sophisticated tests for instruction skipper
3034	>	static bool arch_insn_skipper_tests()
3035	>	{
3036	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
3037	>	static const unsigned char code[] = {
3038	>	0x8a, 0x00,                    // mov    (%eax),%al
3039	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
3040	>	0x88, 0x20,                    // mov    %ah,(%eax)
3041	>	0x88, 0x08,                    // mov    %cl,(%eax)
3042	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
3043	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
3044	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
3045	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
3046	>	0x8b, 0x00,                    // mov    (%eax),%eax
3047	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
3048	>	0x89, 0x00,                    // mov    %eax,(%eax)
3049	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
3050	>	#if defined(__x86_64__)
3051	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
3052	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
3053	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
3054	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
3055	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
3056	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
3057	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
3058	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
3059	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
3060	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
3061	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
3062	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
3063	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
3064	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
3065	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
3066	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
3067	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
3068	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
3069	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
3070	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
3071	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
3072	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
3073	>	0x63, 0x47, 0x04,              // movslq 4(%rdi),%eax
3074	>	0x48, 0x63, 0x47, 0x04,        // movslq 4(%rdi),%rax
3075	>	#endif
3076	>	0                              // end
3077	>	};
3078	>	const int N_REGS = 20;
3079	>	unsigned long regs[N_REGS];
3080	>	for (int i = 0; i < N_REGS; i++)
3081	>	regs[i] = i;
3082	>	const unsigned long start_code = (unsigned long)&code;
3083	>	regs[X86_REG_EIP] = start_code;
3084	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
3085	>	&& ix86_skip_instruction(regs))
3086	>	; /* simply iterate */
3087	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
3088	>	#endif
3089	>	return true;
3090		}
3091		#endif
3092
#	Line 794 | Line 3095 | int main(void)
3095		if (vm_init() < 0)
3096		return 1;
3097
3098	<	page_size = getpagesize();
3098	>	page_size = vm_get_page_size();
3099		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
3100	<	return 1;
3100	>	return 2;
3101
3102	+	memset((void *)page, 0, page_size);
3103		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
3104	<	return 1;
3104	>	return 3;
3105
3106		if (!sigsegv_install_handler(sigsegv_test_handler))
3107	<	return 1;
3108	<
3109	<	page[123] = 45;
3110	<	page[123] = 45;
3111	<
3107	>	return 4;
3108	>
3109	>	#ifdef __GNUC__
3110	>	b_region = &&L_b_region1;
3111	>	e_region = &&L_e_region1;
3112	>	#endif
3113	>	/* This is a really awful hack but otherwise gcc is smart enough
3114	>	* (or bug'ous enough?) to optimize the labels and place them
3115	>	* e.g. at the "main" entry point, which is wrong.
3116	>	*/
3117	>	volatile int label_hack = 1;
3118	>	switch (label_hack) {
3119	>	case 1:
3120	>	L_b_region1:
3121	>	page[REF_INDEX] = REF_VALUE;
3122	>	if (page[REF_INDEX] != REF_VALUE)
3123	>	exit(20);
3124	>	page[REF_INDEX] = REF_VALUE;
3125	>	BARRIER();
3126	>	// fall-through
3127	>	case 2:
3128	>	L_e_region1:
3129	>	BARRIER();
3130	>	break;
3131	>	}
3132	>
3133		if (handler_called != 1)
3134	<	return 1;
3134	>	return 5;
3135
3136		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
3137		if (!sigsegv_install_handler(sigsegv_insn_handler))
3138	<	return 1;
3138	>	return 6;
3139
3140		if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
3141	<	return 1;
3141	>	return 7;
3142
3143		for (int i = 0; i < page_size; i++)
3144		page[i] = (i + 1) % page_size;
3145
3146		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
3147	<	return 1;
3147	>	return 8;
3148
826	–	sigsegv_set_ignore_state(true);
827	–
3149		#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
3150	<	const unsigned int TAG = 0x12345678;                    \
3150	>	const unsigned long TAG = 0x12345678 |                  \
3151	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
3152		TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
3153	<	volatile unsigned int effect = data + TAG;              \
3153	>	volatile unsigned long effect = data + TAG;             \
3154		if (effect != TAG)                                                              \
3155	<	return 1;                                                                       \
3155	>	return 9;                                                                       \
3156		} while (0)
3157
3158	<	TEST_SKIP_INSTRUCTION(unsigned char);
3159	<	TEST_SKIP_INSTRUCTION(unsigned short);
3160	<	TEST_SKIP_INSTRUCTION(unsigned int);
3158	>	#ifdef __GNUC__
3159	>	b_region = &&L_b_region2;
3160	>	e_region = &&L_e_region2;
3161	>	#endif
3162	>	switch (label_hack) {
3163	>	case 1:
3164	>	L_b_region2:
3165	>	TEST_SKIP_INSTRUCTION(unsigned char);
3166	>	TEST_SKIP_INSTRUCTION(unsigned short);
3167	>	TEST_SKIP_INSTRUCTION(unsigned int);
3168	>	TEST_SKIP_INSTRUCTION(unsigned long);
3169	>	TEST_SKIP_INSTRUCTION(signed char);
3170	>	TEST_SKIP_INSTRUCTION(signed short);
3171	>	TEST_SKIP_INSTRUCTION(signed int);
3172	>	TEST_SKIP_INSTRUCTION(signed long);
3173	>	BARRIER();
3174	>	// fall-through
3175	>	case 2:
3176	>	L_e_region2:
3177	>	BARRIER();
3178	>	break;
3179	>	}
3180	>	if (!arch_insn_skipper_tests())
3181	>	return 20;
3182		#endif
3183
3184		vm_exit();

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