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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.9 by gbeauche, 2002-03-16T21:36:12Z vs.
Revision 1.66 by gbeauche, 2007-06-16T06:21:57Z

#	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) 1997-2005 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 41 | Line 53
53		typedef RETSIGTYPE (*signal_handler)(int);
54
55		// User's SIGSEGV handler
56	<	static sigsegv_handler_t sigsegv_user_handler = 0;
56	>	static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
57	>
58	>	// Function called to dump state if we can't handle the fault
59	>	static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
60
61		// Actual SIGSEGV handler installer
62		static bool sigsegv_do_install_handler(int sig);
63
64
65		/*
66	+	*  Instruction decoding aids
67	+	*/
68	+
69	+	// Transfer type
70	+	enum transfer_type_t {
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, // 2 bytes
81	+	SIZE_LONG, // 4 bytes
82	+	SIZE_QUAD, // 8 bytes
83	+	};
84	+
85	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
86	+	// Addressing mode
87	+	enum addressing_mode_t {
88	+	MODE_UNKNOWN,
89	+	MODE_NORM,
90	+	MODE_U,
91	+	MODE_X,
92	+	MODE_UX
93	+	};
94	+
95	+	// Decoded instruction
96	+	struct instruction_t {
97	+	transfer_type_t         transfer_type;
98	+	transfer_size_t         transfer_size;
99	+	addressing_mode_t       addr_mode;
100	+	unsigned int            addr;
101	+	char                            ra, rd;
102	+	};
103	+
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 *)(unsigned long)nip);
108	+	unsigned int primop = opcode >> 26;
109	+	unsigned int exop = (opcode >> 1) & 0x3ff;
110	+	unsigned int ra = (opcode >> 16) & 0x1f;
111	+	unsigned int rb = (opcode >> 11) & 0x1f;
112	+	unsigned int rd = (opcode >> 21) & 0x1f;
113	+	signed int imm = (signed short)(opcode & 0xffff);
114	+
115	+	// Analyze opcode
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 = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
124	+	case 55:        // lwzux
125	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
126	+	case 87:        // lbzx
127	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
128	+	case 119:       // lbzux
129	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
130	+	case 151:       // stwx
131	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
132	+	case 183:       // stwux
133	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
134	+	case 215:       // stbx
135	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
136	+	case 247:       // stbux
137	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
138	+	case 279:       // lhzx
139	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
140	+	case 311:       // lhzux
141	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
142	+	case 343:       // lhax
143	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
144	+	case 375:       // lhaux
145	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
146	+	case 407:       // sthx
147	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
148	+	case 439:       // sthux
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 = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
155	+	case 33:        // lwzu
156	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
157	+	case 34:        // lbz
158	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
159	+	case 35:        // lbzu
160	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
161	+	case 36:        // stw
162	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
163	+	case 37:        // stwu
164	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
165	+	case 38:        // stb
166	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
167	+	case 39:        // stbu
168	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
169	+	case 40:        // lhz
170	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
171	+	case 41:        // lhzu
172	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
173	+	case 42:        // lha
174	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
175	+	case 43:        // lhau
176	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
177	+	case 44:        // sth
178	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
179	+	case 45:        // sthu
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
196	+	unsigned int addr = 0;
197	+	switch (addr_mode) {
198	+	case MODE_X:
199	+	case MODE_UX:
200	+	if (ra == 0)
201	+	addr = gpr[rb];
202	+	else
203	+	addr = gpr[ra] + gpr[rb];
204	+	break;
205	+	case MODE_NORM:
206	+	case MODE_U:
207	+	if (ra == 0)
208	+	addr = (signed int)(signed short)imm;
209	+	else
210	+	addr = gpr[ra] + (signed int)(signed short)imm;
211	+	break;
212	+	default:
213	+	break;
214	+	}
215	+
216	+	// Commit decoded instruction
217	+	instruction->addr = addr;
218	+	instruction->addr_mode = addr_mode;
219	+	instruction->transfer_type = transfer_type;
220	+	instruction->transfer_size = transfer_size;
221	+	instruction->ra = ra;
222	+	instruction->rd = rd;
223	+	}
224	+	#endif
225	+
226	+
227	+	/*
228		*  OS-dependant SIGSEGV signals support section
229		*/
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(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 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_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
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 long *)SIGSEGV_CONTEXT_REGS
300	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
301	>	#endif
302	>	#if (defined(x86_64) || defined(__x86_64__))
303	>	#include <sys/ucontext.h>
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 */
311		#endif
312		#if (defined(powerpc) || defined(__powerpc__))
313		#include <sys/ucontext.h>
314	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.regs->nip)
314	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
315	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
316	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned long *)(SIGSEGV_CONTEXT_REGS->gpr)
317	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
318	>	#endif
319	>	#if (defined(hppa) || defined(__hppa__))
320	>	#undef  SIGSEGV_FAULT_ADDRESS
321	>	#define SIGSEGV_FAULT_ADDRESS                   sip->si_ptr
322	>	#endif
323	>	#if (defined(arm) || defined(__arm__))
324	>	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
325	>	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
326	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.arm_pc)
327	>	#define SIGSEGV_REGISTER_FILE                   (&SIGSEGV_CONTEXT_REGS.arm_r0)
328	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
329	>	#endif
330	>	#if (defined(mips) || defined(__mips__))
331	>	#include <sys/ucontext.h>
332	>	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
333	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.pc)
334	>	#define SIGSEGV_REGISTER_FILE                   &SIGSEGV_CONTEXT_REGS.pc, &SIGSEGV_CONTEXT_REGS.gregs[0]
335	>	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
336		#endif
337		#endif
338		#endif
#	Line 82 | Line 344 | static bool sigsegv_do_install_handler(i
344		#if (defined(i386) || defined(__i386__))
345		#include <asm/sigcontext.h>
346		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
347	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
348	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
347	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
348	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
349	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
350	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
351	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
352	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
353		#endif
354		#if (defined(sparc) || defined(__sparc__))
355		#include <asm/sigcontext.h>
356		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
357	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
358		#define SIGSEGV_FAULT_ADDRESS                   addr
359		#endif
360		#if (defined(powerpc) || defined(__powerpc__))
361		#include <asm/sigcontext.h>
362		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
363	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
364		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
365		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
366	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&scp->regs->nip, (unsigned long *)(scp->regs->gpr)
367	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
368		#endif
369		#if (defined(alpha) || defined(__alpha__))
370		#include <asm/sigcontext.h>
371		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
372	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
373		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
374		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
375	<
376	<	// From Boehm's GC 6.0alpha8
377	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
378	<	{
379	<	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
380	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
381	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
382	<	return (sigsegv_address_t)fault_address;
383	<	}
375	>	#endif
376	>	#if (defined(arm) || defined(__arm__))
377	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int r1, int r2, int r3, struct sigcontext sc
378	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
379	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &sc
380	>	#define SIGSEGV_FAULT_ADDRESS                   scp->fault_address
381	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->arm_pc
382	>	#define SIGSEGV_REGISTER_FILE                   &scp->arm_r0
383	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
384		#endif
385		#endif
386
387		// Irix 5 or 6 on MIPS
388	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
388	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
389	>	#include <ucontext.h>
390		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
391	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
391	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
392	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
393	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
394		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
395		#endif
396
397	+	// HP-UX
398	+	#if (defined(hpux) || defined(__hpux__))
399	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
400	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
401	+	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
402	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
403	+	#endif
404	+
405		// OSF/1 on Alpha
406		#if defined(__osf__)
407	+	#include <ucontext.h>
408		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
409	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
410		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
411		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
412		#endif
#	Line 130 | Line 414 | static sigsegv_address_t get_fault_addre
414		// AIX
415		#if defined(_AIX)
416		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
417	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
418		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
419		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
420		#endif
421
422	<	// NetBSD or FreeBSD
423	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
422	>	// NetBSD
423	>	#if defined(__NetBSD__)
424		#if (defined(m68k) || defined(__m68k__))
425		#include <m68k/frame.h>
426		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
427	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
428	<	struct sigstate {                                                                                                                                                                       \
144	<	int ss_flags;                                                                                                                                                                   \
145	<	struct frame ss_frame;                                                                                                                                                  \
146	<	};                                                                                                                                                                                                      \
147	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
148	<	char *fault_addr;                                                                                                                                                                       \
149	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
150	<	case 7:         /* 68040 access error */                                                                                                                                \
151	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
152	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
153	<	break;                                                                                                                                                                                  \
154	<	default:                                                                                                                                                                                        \
155	<	fault_addr = (char *)code;                                                                                                                                              \
156	<	break;                                                                                                                                                                                  \
157	<	}                                                                                                                                                                                                       \
158	<	fault_addr;                                                                                                                                                                                     \
159	<	})
427	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
428	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
429		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
430	<	#else
431	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
432	<	#define SIGSEGV_FAULT_ADDRESS                   addr
430	>
431	>	// Use decoding scheme from BasiliskII/m68k native
432	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
433	>	{
434	>	struct sigstate {
435	>	int ss_flags;
436	>	struct frame ss_frame;
437	>	};
438	>	struct sigstate *state = (struct sigstate *)scp->sc_ap;
439	>	char *fault_addr;
440	>	switch (state->ss_frame.f_format) {
441	>	case 7:         /* 68040 access error */
442	>	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
443	>	fault_addr = state->ss_frame.f_fmt7.f_fa;
444	>	break;
445	>	default:
446	>	fault_addr = (char *)code;
447	>	break;
448	>	}
449	>	return (sigsegv_address_t)fault_addr;
450	>	}
451	>	#endif
452	>	#if (defined(alpha) || defined(__alpha__))
453	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
454	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
455	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
456	>	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
457	>	#endif
458	>	#if (defined(i386) || defined(__i386__))
459	>	#error "FIXME: need to decode instruction and compute EA"
460	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
461	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
462	>	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
463	>	#endif
464	>	#endif
465	>	#if defined(__FreeBSD__)
466	>	#if (defined(i386) || defined(__i386__))
467		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
468	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
469	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
470	+	#define SIGSEGV_FAULT_ADDRESS                   addr
471	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
472	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
473	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
474		#endif
475	+	#if (defined(alpha) || defined(__alpha__))
476	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
477	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, char *addr, struct sigcontext *scp
478	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, addr, scp
479	+	#define SIGSEGV_FAULT_ADDRESS                   addr
480	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
481	+	#endif
482	+	#endif
483	+
484	+	// Extract fault address out of a sigcontext
485	+	#if (defined(alpha) || defined(__alpha__))
486	+	// From Boehm's GC 6.0alpha8
487	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
488	+	{
489	+	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
490	+	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
491	+	fault_address += (signed long)(signed short)(instruction & 0xffff);
492	+	return (sigsegv_address_t)fault_address;
493	+	}
494		#endif
495
496	<	// MacOS X
496	>
497	>	// MacOS X, not sure which version this works in. Under 10.1
498	>	// vm_protect does not appear to work from a signal handler. Under
499	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
500	>	// field is the address of the faulting instruction and not the
501	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
502	>	// case with Mach exception handlers there is a way to do what this
503	>	// was meant to do.
504	>	#ifndef HAVE_MACH_EXCEPTIONS
505		#if defined(__APPLE__) && defined(__MACH__)
506		#if (defined(ppc) || defined(__ppc__))
507		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
508	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
509		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
510		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
511		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
512	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
513	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
514
515	<	// From Boehm's GC 6.0alpha8
177	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
178	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
179	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
180	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
181	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
182	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
183	<
515	>	// Use decoding scheme from SheepShaver
516		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
517		{
518	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
519	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
520	<	int            disp = 0, tmp;
521	<	unsigned int   baseA = 0, baseB = 0;
522	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
523	<
524	<	switch(EXTRACT_OP1(instr)) {
525	<	case 38:   /* stb */
526	<	case 39:   /* stbu */
527	<	case 54:   /* stfd */
528	<	case 55:   /* stfdu */
529	<	case 52:   /* stfs */
530	<	case 53:   /* stfsu */
531	<	case 44:   /* sth */
532	<	case 45:   /* sthu */
533	<	case 47:   /* stmw */
534	<	case 36:   /* stw */
535	<	case 37:   /* stwu */
536	<	tmp = EXTRACT_REGA(instr);
537	<	if(tmp > 0)
538	<	baseA = regs[tmp];
539	<	disp = EXTRACT_DISP(instr);
518	>	unsigned int   nip = (unsigned int) scp->sc_ir;
519	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
520	>	instruction_t  instr;
521	>
522	>	powerpc_decode_instruction(&instr, nip, gpr);
523	>	return (sigsegv_address_t)instr.addr;
524	>	}
525	>	#endif
526	>	#endif
527	>	#endif
528	>	#endif
529	>
530	>	#if HAVE_WIN32_EXCEPTIONS
531	>	#define WIN32_LEAN_AND_MEAN /* avoid including junk */
532	>	#include <windows.h>
533	>	#include <winerror.h>
534	>
535	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   EXCEPTION_POINTERS *ExceptionInfo
536	>	#define SIGSEGV_FAULT_HANDLER_ARGS              ExceptionInfo
537	>	#define SIGSEGV_FAULT_ADDRESS                   ExceptionInfo->ExceptionRecord->ExceptionInformation[1]
538	>	#define SIGSEGV_CONTEXT_REGS                    ExceptionInfo->ContextRecord
539	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS->Eip
540	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&SIGSEGV_CONTEXT_REGS->Edi)
541	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
542	>	#endif
543	>
544	>	#if HAVE_MACH_EXCEPTIONS
545	>
546	>	// This can easily be extended to other Mach systems, but really who
547	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
548	>	// Mach 2.5/3.0?
549	>	#if defined(__APPLE__) && defined(__MACH__)
550	>
551	>	#include <sys/types.h>
552	>	#include <stdlib.h>
553	>	#include <stdio.h>
554	>	#include <pthread.h>
555	>
556	>	/*
557	>	* If you are familiar with MIG then you will understand the frustration
558	>	* that was necessary to get these embedded into C++ code by hand.
559	>	*/
560	>	extern "C" {
561	>	#include <mach/mach.h>
562	>	#include <mach/mach_error.h>
563	>
564	>	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
565	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
566	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
567	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
568	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
569	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
570	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
571	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
572	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
573	>	exception_type_t, 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	>	}
576	>
577	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
578	>	#define HANDLER_COUNT 64
579	>
580	>	// structure to tuck away existing exception handlers
581	>	typedef struct _ExceptionPorts {
582	>	mach_msg_type_number_t maskCount;
583	>	exception_mask_t masks[HANDLER_COUNT];
584	>	exception_handler_t handlers[HANDLER_COUNT];
585	>	exception_behavior_t behaviors[HANDLER_COUNT];
586	>	thread_state_flavor_t flavors[HANDLER_COUNT];
587	>	} ExceptionPorts;
588	>
589	>	// exception handler thread
590	>	static pthread_t exc_thread;
591	>
592	>	// place where old exception handler info is stored
593	>	static ExceptionPorts ports;
594	>
595	>	// our exception port
596	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
597	>
598	>	#define MACH_CHECK_ERROR(name,ret) \
599	>	if (ret != KERN_SUCCESS) { \
600	>	mach_error(#name, ret); \
601	>	exit (1); \
602	>	}
603	>
604	>	#ifdef __ppc__
605	>	#define SIGSEGV_EXCEPTION_STATE_TYPE    ppc_exception_state_t
606	>	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  PPC_EXCEPTION_STATE
607	>	#define SIGSEGV_EXCEPTION_STATE_COUNT   PPC_EXCEPTION_STATE_COUNT
608	>	#define SIGSEGV_FAULT_ADDRESS                   exc_state->dar
609	>	#define SIGSEGV_THREAD_STATE_TYPE               ppc_thread_state_t
610	>	#define SIGSEGV_THREAD_STATE_FLAVOR             PPC_THREAD_STATE
611	>	#define SIGSEGV_THREAD_STATE_COUNT              PPC_THREAD_STATE_COUNT
612	>	#define SIGSEGV_FAULT_INSTRUCTION               state.srr0
613	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
614	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&state.srr0, (unsigned long *)&state.r0
615	>	#endif
616	>	#ifdef __i386__
617	>	#ifdef i386_SAVED_STATE
618	>	#define SIGSEGV_THREAD_STATE_TYPE               struct i386_saved_state
619	>	#define SIGSEGV_THREAD_STATE_FLAVOR             i386_SAVED_STATE
620	>	#define SIGSEGV_THREAD_STATE_COUNT              i386_SAVED_STATE_COUNT
621	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&state.edi) /* EDI is the first GPR we consider */
622	>	#else
623	>	#define SIGSEGV_EXCEPTION_STATE_TYPE    struct i386_exception_state
624	>	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  i386_EXCEPTION_STATE
625	>	#define SIGSEGV_EXCEPTION_STATE_COUNT   i386_EXCEPTION_STATE_COUNT
626	>	#define SIGSEGV_FAULT_ADDRESS                   exc_state->faultvaddr
627	>	#define SIGSEGV_THREAD_STATE_TYPE               struct i386_thread_state
628	>	#define SIGSEGV_THREAD_STATE_FLAVOR             i386_THREAD_STATE
629	>	#define SIGSEGV_THREAD_STATE_COUNT              i386_THREAD_STATE_COUNT
630	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&state.eax) /* EAX is the first GPR we consider */
631	>	#endif
632	>	#define SIGSEGV_FAULT_INSTRUCTION               state.eip
633	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
634	>	#endif
635	>	#ifdef __x86_64__
636	>	#define SIGSEGV_EXCEPTION_STATE_TYPE    struct x86_exception_state64
637	>	#define SIGSEGV_EXCEPTION_STATE_FLAVOR  x86_EXCEPTION_STATE64
638	>	#define SIGSEGV_EXCEPTION_STATE_COUNT   x86_EXCEPTION_STATE64_COUNT
639	>	#define SIGSEGV_FAULT_ADDRESS                   exc_state->faultvaddr
640	>	#define SIGSEGV_THREAD_STATE_TYPE               struct x86_thread_state64
641	>	#define SIGSEGV_THREAD_STATE_FLAVOR             x86_THREAD_STATE64
642	>	#define SIGSEGV_THREAD_STATE_COUNT              x86_THREAD_STATE64_COUNT
643	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&state.rax) /* RAX is the first GPR we consider */
644	>	#define SIGSEGV_FAULT_INSTRUCTION               state.rip
645	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
646	>	#endif
647	>	#ifdef SIGSEGV_EXCEPTION_STATE_TYPE
648	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, SIGSEGV_EXCEPTION_STATE_TYPE *exc_state
649	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, &exc_state
650	>	#else
651	>	#define SIGSEGV_FAULT_ADDRESS                   code[1]
652	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code
653	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code
654	>	#endif
655	>
656	>	// Since there can only be one exception thread running at any time
657	>	// this is not a problem.
658	>	#define MSG_SIZE 512
659	>	static char msgbuf[MSG_SIZE];
660	>	static char replybuf[MSG_SIZE];
661	>
662	>	/*
663	>	* This is the entry point for the exception handler thread. The job
664	>	* of this thread is to wait for exception messages on the exception
665	>	* port that was setup beforehand and to pass them on to exc_server.
666	>	* exc_server is a MIG generated function that is a part of Mach.
667	>	* Its job is to decide what to do with the exception message. In our
668	>	* case exc_server calls catch_exception_raise on our behalf. After
669	>	* exc_server returns, it is our responsibility to send the reply.
670	>	*/
671	>	static void *
672	>	handleExceptions(void *priv)
673	>	{
674	>	mach_msg_header_t *msg, *reply;
675	>	kern_return_t krc;
676	>
677	>	msg = (mach_msg_header_t *)msgbuf;
678	>	reply = (mach_msg_header_t *)replybuf;
679	>
680	>	for (;;) {
681	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
682	>	_exceptionPort, 0, MACH_PORT_NULL);
683	>	MACH_CHECK_ERROR(mach_msg, krc);
684	>
685	>	if (!exc_server(msg, reply)) {
686	>	fprintf(stderr, "exc_server hated the message\n");
687	>	exit(1);
688	>	}
689	>
690	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
691	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
692	>	if (krc != KERN_SUCCESS) {
693	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
694	>	krc, mach_error_string(krc));
695	>	exit(1);
696	>	}
697	>	}
698	>	}
699	>	#endif
700	>	#endif
701	>
702	>
703	>	/*
704	>	*  Instruction skipping
705	>	*/
706	>
707	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
708	>	// Decode and skip X86 instruction
709	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
710	>	#if defined(__linux__)
711	>	enum {
712	>	#if (defined(i386) || defined(__i386__))
713	>	X86_REG_EIP = 14,
714	>	X86_REG_EAX = 11,
715	>	X86_REG_ECX = 10,
716	>	X86_REG_EDX = 9,
717	>	X86_REG_EBX = 8,
718	>	X86_REG_ESP = 7,
719	>	X86_REG_EBP = 6,
720	>	X86_REG_ESI = 5,
721	>	X86_REG_EDI = 4
722	>	#endif
723	>	#if defined(__x86_64__)
724	>	X86_REG_R8  = 0,
725	>	X86_REG_R9  = 1,
726	>	X86_REG_R10 = 2,
727	>	X86_REG_R11 = 3,
728	>	X86_REG_R12 = 4,
729	>	X86_REG_R13 = 5,
730	>	X86_REG_R14 = 6,
731	>	X86_REG_R15 = 7,
732	>	X86_REG_EDI = 8,
733	>	X86_REG_ESI = 9,
734	>	X86_REG_EBP = 10,
735	>	X86_REG_EBX = 11,
736	>	X86_REG_EDX = 12,
737	>	X86_REG_EAX = 13,
738	>	X86_REG_ECX = 14,
739	>	X86_REG_ESP = 15,
740	>	X86_REG_EIP = 16
741	>	#endif
742	>	};
743	>	#endif
744	>	#if defined(__NetBSD__)
745	>	enum {
746	>	#if (defined(i386) || defined(__i386__))
747	>	X86_REG_EIP = _REG_EIP,
748	>	X86_REG_EAX = _REG_EAX,
749	>	X86_REG_ECX = _REG_ECX,
750	>	X86_REG_EDX = _REG_EDX,
751	>	X86_REG_EBX = _REG_EBX,
752	>	X86_REG_ESP = _REG_ESP,
753	>	X86_REG_EBP = _REG_EBP,
754	>	X86_REG_ESI = _REG_ESI,
755	>	X86_REG_EDI = _REG_EDI
756	>	#endif
757	>	};
758	>	#endif
759	>	#if defined(__FreeBSD__)
760	>	enum {
761	>	#if (defined(i386) || defined(__i386__))
762	>	X86_REG_EIP = 10,
763	>	X86_REG_EAX = 7,
764	>	X86_REG_ECX = 6,
765	>	X86_REG_EDX = 5,
766	>	X86_REG_EBX = 4,
767	>	X86_REG_ESP = 13,
768	>	X86_REG_EBP = 2,
769	>	X86_REG_ESI = 1,
770	>	X86_REG_EDI = 0
771	>	#endif
772	>	};
773	>	#endif
774	>	#if defined(__OpenBSD__)
775	>	enum {
776	>	#if defined(__i386__)
777	>	// EDI is the first register we consider
778	>	#define OREG(REG) offsetof(struct sigcontext, sc_##REG)
779	>	#define DREG(REG) ((OREG(REG) - OREG(edi)) / 4)
780	>	X86_REG_EIP = DREG(eip), // 7
781	>	X86_REG_EAX = DREG(eax), // 6
782	>	X86_REG_ECX = DREG(ecx), // 5
783	>	X86_REG_EDX = DREG(edx), // 4
784	>	X86_REG_EBX = DREG(ebx), // 3
785	>	X86_REG_ESP = DREG(esp), // 10
786	>	X86_REG_EBP = DREG(ebp), // 2
787	>	X86_REG_ESI = DREG(esi), // 1
788	>	X86_REG_EDI = DREG(edi)  // 0
789	>	#undef DREG
790	>	#undef OREG
791	>	#endif
792	>	};
793	>	#endif
794	>	#if defined(__sun__)
795	>	// Same as for Linux, need to check for x86-64
796	>	enum {
797	>	#if defined(__i386__)
798	>	X86_REG_EIP = EIP,
799	>	X86_REG_EAX = EAX,
800	>	X86_REG_ECX = ECX,
801	>	X86_REG_EDX = EDX,
802	>	X86_REG_EBX = EBX,
803	>	X86_REG_ESP = ESP,
804	>	X86_REG_EBP = EBP,
805	>	X86_REG_ESI = ESI,
806	>	X86_REG_EDI = EDI
807	>	#endif
808	>	};
809	>	#endif
810	>	#if defined(__APPLE__) && defined(__MACH__)
811	>	enum {
812	>	#if (defined(i386) || defined(__i386__))
813	>	#ifdef i386_SAVED_STATE
814	>	// same as FreeBSD (in Open Darwin 8.0.1)
815	>	X86_REG_EIP = 10,
816	>	X86_REG_EAX = 7,
817	>	X86_REG_ECX = 6,
818	>	X86_REG_EDX = 5,
819	>	X86_REG_EBX = 4,
820	>	X86_REG_ESP = 13,
821	>	X86_REG_EBP = 2,
822	>	X86_REG_ESI = 1,
823	>	X86_REG_EDI = 0
824	>	#else
825	>	// new layout (MacOS X 10.4.4 for x86)
826	>	X86_REG_EIP = 10,
827	>	X86_REG_EAX = 0,
828	>	X86_REG_ECX = 2,
829	>	X86_REG_EDX = 3,
830	>	X86_REG_EBX = 1,
831	>	X86_REG_ESP = 7,
832	>	X86_REG_EBP = 6,
833	>	X86_REG_ESI = 5,
834	>	X86_REG_EDI = 4
835	>	#endif
836	>	#endif
837	>	#if defined(__x86_64__)
838	>	X86_REG_R8  = 8,
839	>	X86_REG_R9  = 9,
840	>	X86_REG_R10 = 10,
841	>	X86_REG_R11 = 11,
842	>	X86_REG_R12 = 12,
843	>	X86_REG_R13 = 13,
844	>	X86_REG_R14 = 14,
845	>	X86_REG_R15 = 15,
846	>	X86_REG_EDI = 4,
847	>	X86_REG_ESI = 5,
848	>	X86_REG_EBP = 6,
849	>	X86_REG_EBX = 1,
850	>	X86_REG_EDX = 3,
851	>	X86_REG_EAX = 0,
852	>	X86_REG_ECX = 2,
853	>	X86_REG_ESP = 7,
854	>	X86_REG_EIP = 16
855	>	#endif
856	>	};
857	>	#endif
858	>	#if defined(_WIN32)
859	>	enum {
860	>	#if (defined(i386) || defined(__i386__))
861	>	X86_REG_EIP = 7,
862	>	X86_REG_EAX = 5,
863	>	X86_REG_ECX = 4,
864	>	X86_REG_EDX = 3,
865	>	X86_REG_EBX = 2,
866	>	X86_REG_ESP = 10,
867	>	X86_REG_EBP = 6,
868	>	X86_REG_ESI = 1,
869	>	X86_REG_EDI = 0
870	>	#endif
871	>	};
872	>	#endif
873	>	// FIXME: this is partly redundant with the instruction decoding phase
874	>	// to discover transfer type and register number
875	>	static inline int ix86_step_over_modrm(unsigned char * p)
876	>	{
877	>	int mod = (p[0] >> 6) & 3;
878	>	int rm = p[0] & 7;
879	>	int offset = 0;
880	>
881	>	// ModR/M Byte
882	>	switch (mod) {
883	>	case 0: // [reg]
884	>	if (rm == 5) return 4; // disp32
885		break;
886	<	case 31:
887	<	switch(EXTRACT_OP2(instr)) {
888	<	case 86:    /* dcbf */
889	<	case 54:    /* dcbst */
890	<	case 1014:  /* dcbz */
891	<	case 247:   /* stbux */
892	<	case 215:   /* stbx */
893	<	case 759:   /* stfdux */
894	<	case 727:   /* stfdx */
895	<	case 983:   /* stfiwx */
896	<	case 695:   /* stfsux */
897	<	case 663:   /* stfsx */
898	<	case 918:   /* sthbrx */
899	<	case 439:   /* sthux */
900	<	case 407:   /* sthx */
901	<	case 661:   /* stswx */
902	<	case 662:   /* stwbrx */
903	<	case 150:   /* stwcx. */
904	<	case 183:   /* stwux */
905	<	case 151:   /* stwx */
906	<	case 135:   /* stvebx */
907	<	case 167:   /* stvehx */
908	<	case 199:   /* stvewx */
909	<	case 231:   /* stvx */
910	<	case 487:   /* stvxl */
911	<	tmp = EXTRACT_REGA(instr);
912	<	if(tmp > 0)
913	<	baseA = regs[tmp];
914	<	baseB = regs[EXTRACT_REGC(instr)];
915	<	/* determine Altivec alignment mask */
916	<	switch(EXTRACT_OP2(instr)) {
917	<	case 167:   /* stvehx */
918	<	alignmask = 0xFFFFFFFE;
919	<	break;
920	<	case 199:   /* stvewx */
921	<	alignmask = 0xFFFFFFFC;
922	<	break;
923	<	case 231:   /* stvx */
924	<	alignmask = 0xFFFFFFF0;
925	<	break;
926	<	case 487:  /* stvxl */
927	<	alignmask = 0xFFFFFFF0;
928	<	break;
929	<	}
886	>	case 1: // disp8[reg]
887	>	offset = 1;
888	>	break;
889	>	case 2: // disp32[reg]
890	>	offset = 4;
891	>	break;
892	>	case 3: // register
893	>	return 0;
894	>	}
895	>
896	>	// SIB Byte
897	>	if (rm == 4) {
898	>	if (mod == 0 && (p[1] & 7) == 5)
899	>	offset = 5; // disp32[index]
900	>	else
901	>	offset++;
902	>	}
903	>
904	>	return offset;
905	>	}
906	>
907	>	static bool ix86_skip_instruction(unsigned long * regs)
908	>	{
909	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
910	>
911	>	if (eip == 0)
912	>	return false;
913	>	#ifdef _WIN32
914	>	if (IsBadCodePtr((FARPROC)eip))
915	>	return false;
916	>	#endif
917	>
918	>	enum instruction_type_t {
919	>	i_MOV,
920	>	i_ADD
921	>	};
922	>
923	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
924	>	transfer_size_t transfer_size = SIZE_LONG;
925	>	instruction_type_t instruction_type = i_MOV;
926	>
927	>	int reg = -1;
928	>	int len = 0;
929	>
930	>	#if DEBUG
931	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
932	>	eip, eip[0], eip[1], eip[2], eip[3]);
933	>	#endif
934	>
935	>	// Operand size prefix
936	>	if (*eip == 0x66) {
937	>	eip++;
938	>	len++;
939	>	transfer_size = SIZE_WORD;
940	>	}
941	>
942	>	// REX prefix
943	>	#if defined(__x86_64__)
944	>	struct rex_t {
945	>	unsigned char W;
946	>	unsigned char R;
947	>	unsigned char X;
948	>	unsigned char B;
949	>	};
950	>	rex_t rex = { 0, 0, 0, 0 };
951	>	bool has_rex = false;
952	>	if ((*eip & 0xf0) == 0x40) {
953	>	has_rex = true;
954	>	const unsigned char b = *eip;
955	>	rex.W = b & (1 << 3);
956	>	rex.R = b & (1 << 2);
957	>	rex.X = b & (1 << 1);
958	>	rex.B = b & (1 << 0);
959	>	#if DEBUG
960	>	printf("REX: %c,%c,%c,%c\n",
961	>	rex.W ? 'W' : '_',
962	>	rex.R ? 'R' : '_',
963	>	rex.X ? 'X' : '_',
964	>	rex.B ? 'B' : '_');
965	>	#endif
966	>	eip++;
967	>	len++;
968	>	if (rex.W)
969	>	transfer_size = SIZE_QUAD;
970	>	}
971	>	#else
972	>	const bool has_rex = false;
973	>	#endif
974	>
975	>	// Decode instruction
976	>	int op_len = 1;
977	>	int target_size = SIZE_UNKNOWN;
978	>	switch (eip[0]) {
979	>	case 0x0f:
980	>	target_size = transfer_size;
981	>	switch (eip[1]) {
982	>	case 0xbe: // MOVSX r32, r/m8
983	>	case 0xb6: // MOVZX r32, r/m8
984	>	transfer_size = SIZE_BYTE;
985	>	goto do_mov_extend;
986	>	case 0xbf: // MOVSX r32, r/m16
987	>	case 0xb7: // MOVZX r32, r/m16
988	>	transfer_size = SIZE_WORD;
989	>	goto do_mov_extend;
990	>	do_mov_extend:
991	>	op_len = 2;
992	>	goto do_transfer_load;
993	>	}
994	>	break;
995	>	#if defined(__x86_64__)
996	>	case 0x63: // MOVSXD r64, r/m32
997	>	if (has_rex && rex.W) {
998	>	transfer_size = SIZE_LONG;
999	>	target_size = SIZE_QUAD;
1000	>	}
1001	>	else if (transfer_size != SIZE_WORD) {
1002	>	transfer_size = SIZE_LONG;
1003	>	target_size = SIZE_QUAD;
1004	>	}
1005	>	goto do_transfer_load;
1006	>	#endif
1007	>	case 0x02: // ADD r8, r/m8
1008	>	transfer_size = SIZE_BYTE;
1009	>	case 0x03: // ADD r32, r/m32
1010	>	instruction_type = i_ADD;
1011	>	goto do_transfer_load;
1012	>	case 0x8a: // MOV r8, r/m8
1013	>	transfer_size = SIZE_BYTE;
1014	>	case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
1015	>	do_transfer_load:
1016	>	switch (eip[op_len] & 0xc0) {
1017	>	case 0x80:
1018	>	reg = (eip[op_len] >> 3) & 7;
1019	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1020		break;
1021	<	case 725:   /* stswi */
1022	<	tmp = EXTRACT_REGA(instr);
1023	<	if(tmp > 0)
257	<	baseA = regs[tmp];
1021	>	case 0x40:
1022	>	reg = (eip[op_len] >> 3) & 7;
1023	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1024		break;
1025	<	default:   /* ignore instruction */
1026	<	return 0;
1025	>	case 0x00:
1026	>	reg = (eip[op_len] >> 3) & 7;
1027	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1028		break;
1029		}
1030	+	len += 1 + op_len + ix86_step_over_modrm(eip + op_len);
1031		break;
1032	<	default:   /* ignore instruction */
1033	<	return 0;
1032	>	case 0x00: // ADD r/m8, r8
1033	>	transfer_size = SIZE_BYTE;
1034	>	case 0x01: // ADD r/m32, r32
1035	>	instruction_type = i_ADD;
1036	>	goto do_transfer_store;
1037	>	case 0x88: // MOV r/m8, r8
1038	>	transfer_size = SIZE_BYTE;
1039	>	case 0x89: // MOV r/m32, r32 (or 16-bit operation)
1040	>	do_transfer_store:
1041	>	switch (eip[op_len] & 0xc0) {
1042	>	case 0x80:
1043	>	reg = (eip[op_len] >> 3) & 7;
1044	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1045	>	break;
1046	>	case 0x40:
1047	>	reg = (eip[op_len] >> 3) & 7;
1048	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1049	>	break;
1050	>	case 0x00:
1051	>	reg = (eip[op_len] >> 3) & 7;
1052	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1053	>	break;
1054	>	}
1055	>	len += 1 + op_len + ix86_step_over_modrm(eip + op_len);
1056		break;
1057		}
1058	+	if (target_size == SIZE_UNKNOWN)
1059	+	target_size = transfer_size;
1060	+
1061	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1062	+	// Unknown machine code, let it crash. Then patch the decoder
1063	+	return false;
1064	+	}
1065	+
1066	+	#if defined(__x86_64__)
1067	+	if (rex.R)
1068	+	reg += 8;
1069	+	#endif
1070	+
1071	+	if (instruction_type == i_MOV && transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
1072	+	static const int x86_reg_map[] = {
1073	+	X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
1074	+	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
1075	+	#if defined(__x86_64__)
1076	+	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
1077	+	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
1078	+	#endif
1079	+	};
1080	+
1081	+	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
1082	+	return false;
1083	+
1084	+	// Set 0 to the relevant register part
1085	+	// NOTE: this is only valid for MOV alike instructions
1086	+	int rloc = x86_reg_map[reg];
1087	+	switch (target_size) {
1088	+	case SIZE_BYTE:
1089	+	if (has_rex || reg < 4)
1090	+	regs[rloc] = (regs[rloc] & ~0x00ffL);
1091	+	else {
1092	+	rloc = x86_reg_map[reg - 4];
1093	+	regs[rloc] = (regs[rloc] & ~0xff00L);
1094	+	}
1095	+	break;
1096	+	case SIZE_WORD:
1097	+	regs[rloc] = (regs[rloc] & ~0xffffL);
1098	+	break;
1099	+	case SIZE_LONG:
1100	+	case SIZE_QUAD: // zero-extension
1101	+	regs[rloc] = 0;
1102	+	break;
1103	+	}
1104	+	}
1105	+
1106	+	#if DEBUG
1107	+	printf("%p: %s %s access", (void *)regs[X86_REG_EIP],
1108	+	transfer_size == SIZE_BYTE ? "byte" :
1109	+	transfer_size == SIZE_WORD ? "word" :
1110	+	transfer_size == SIZE_LONG ? "long" :
1111	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1112	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1113	+
1114	+	if (reg != -1) {
1115	+	static const char * x86_byte_reg_str_map[] = {
1116	+	"al",   "cl",   "dl",   "bl",
1117	+	"spl",  "bpl",  "sil",  "dil",
1118	+	"r8b",  "r9b",  "r10b", "r11b",
1119	+	"r12b", "r13b", "r14b", "r15b",
1120	+	"ah",   "ch",   "dh",   "bh",
1121	+	};
1122	+	static const char * x86_word_reg_str_map[] = {
1123	+	"ax",   "cx",   "dx",   "bx",
1124	+	"sp",   "bp",   "si",   "di",
1125	+	"r8w",  "r9w",  "r10w", "r11w",
1126	+	"r12w", "r13w", "r14w", "r15w",
1127	+	};
1128	+	static const char *x86_long_reg_str_map[] = {
1129	+	"eax",  "ecx",  "edx",  "ebx",
1130	+	"esp",  "ebp",  "esi",  "edi",
1131	+	"r8d",  "r9d",  "r10d", "r11d",
1132	+	"r12d", "r13d", "r14d", "r15d",
1133	+	};
1134	+	static const char *x86_quad_reg_str_map[] = {
1135	+	"rax", "rcx", "rdx", "rbx",
1136	+	"rsp", "rbp", "rsi", "rdi",
1137	+	"r8",  "r9",  "r10", "r11",
1138	+	"r12", "r13", "r14", "r15",
1139	+	};
1140	+	const char * reg_str = NULL;
1141	+	switch (target_size) {
1142	+	case SIZE_BYTE:
1143	+	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
1144	+	break;
1145	+	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
1146	+	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
1147	+	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
1148	+	}
1149	+	if (reg_str)
1150	+	printf(" %s register %%%s",
1151	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
1152	+	reg_str);
1153	+	}
1154	+	printf(", %d bytes instruction\n", len);
1155	+	#endif
1156	+
1157	+	regs[X86_REG_EIP] += len;
1158	+	return true;
1159	+	}
1160	+	#endif
1161	+
1162	+	// Decode and skip PPC instruction
1163	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
1164	+	static bool powerpc_skip_instruction(unsigned long * nip_p, unsigned long * regs)
1165	+	{
1166	+	instruction_t instr;
1167	+	powerpc_decode_instruction(&instr, *nip_p, regs);
1168	+
1169	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1170	+	// Unknown machine code, let it crash. Then patch the decoder
1171	+	return false;
1172	+	}
1173	+
1174	+	#if DEBUG
1175	+	printf("%08x: %s %s access", *nip_p,
1176	+	instr.transfer_size == SIZE_BYTE ? "byte" :
1177	+	instr.transfer_size == SIZE_WORD ? "word" :
1178	+	instr.transfer_size == SIZE_LONG ? "long" : "quad",
1179	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1180	+
1181	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1182	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
1183	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1184	+	printf(" r%d (rd = 0)\n", instr.rd);
1185	+	#endif
1186	+
1187	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1188	+	regs[instr.ra] = instr.addr;
1189	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1190	+	regs[instr.rd] = 0;
1191
1192	<	addr = (baseA + baseB) + disp;
1193	<	addr &= alignmask;
1194	<	return (sigsegv_address_t)addr;
1192	>	*nip_p += 4;
1193	>	return true;
1194	>	}
1195	>	#endif
1196	>
1197	>	// Decode and skip MIPS instruction
1198	>	#if (defined(mips) || defined(__mips))
1199	>	static bool mips_skip_instruction(greg_t * pc_p, greg_t * regs)
1200	>	{
1201	>	unsigned int * epc = (unsigned int *)(unsigned long)*pc_p;
1202	>
1203	>	if (epc == 0)
1204	>	return false;
1205	>
1206	>	#if DEBUG
1207	>	printf("IP: %p [%08x]\n", epc, epc[0]);
1208	>	#endif
1209	>
1210	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1211	>	transfer_size_t transfer_size = SIZE_LONG;
1212	>	int direction = 0;
1213	>
1214	>	const unsigned int opcode = epc[0];
1215	>	switch (opcode >> 26) {
1216	>	case 32: // Load Byte
1217	>	case 36: // Load Byte Unsigned
1218	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1219	>	transfer_size = SIZE_BYTE;
1220	>	break;
1221	>	case 33: // Load Halfword
1222	>	case 37: // Load Halfword Unsigned
1223	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1224	>	transfer_size = SIZE_WORD;
1225	>	break;
1226	>	case 35: // Load Word
1227	>	case 39: // Load Word Unsigned
1228	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1229	>	transfer_size = SIZE_LONG;
1230	>	break;
1231	>	case 34: // Load Word Left
1232	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1233	>	transfer_size = SIZE_LONG;
1234	>	direction = -1;
1235	>	break;
1236	>	case 38: // Load Word Right
1237	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1238	>	transfer_size = SIZE_LONG;
1239	>	direction = 1;
1240	>	break;
1241	>	case 55: // Load Doubleword
1242	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1243	>	transfer_size = SIZE_QUAD;
1244	>	break;
1245	>	case 26: // Load Doubleword Left
1246	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1247	>	transfer_size = SIZE_QUAD;
1248	>	direction = -1;
1249	>	break;
1250	>	case 27: // Load Doubleword Right
1251	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1252	>	transfer_size = SIZE_QUAD;
1253	>	direction = 1;
1254	>	break;
1255	>	case 40: // Store Byte
1256	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1257	>	transfer_size = SIZE_BYTE;
1258	>	break;
1259	>	case 41: // Store Halfword
1260	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1261	>	transfer_size = SIZE_WORD;
1262	>	break;
1263	>	case 43: // Store Word
1264	>	case 42: // Store Word Left
1265	>	case 46: // Store Word Right
1266	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1267	>	transfer_size = SIZE_LONG;
1268	>	break;
1269	>	case 63: // Store Doubleword
1270	>	case 44: // Store Doubleword Left
1271	>	case 45: // Store Doubleword Right
1272	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1273	>	transfer_size = SIZE_QUAD;
1274	>	break;
1275	>	/* Misc instructions unlikely to be used within CPU emulators */
1276	>	case 48: // Load Linked Word
1277	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1278	>	transfer_size = SIZE_LONG;
1279	>	break;
1280	>	case 52: // Load Linked Doubleword
1281	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1282	>	transfer_size = SIZE_QUAD;
1283	>	break;
1284	>	case 56: // Store Conditional Word
1285	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1286	>	transfer_size = SIZE_LONG;
1287	>	break;
1288	>	case 60: // Store Conditional Doubleword
1289	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1290	>	transfer_size = SIZE_QUAD;
1291	>	break;
1292	>	}
1293	>
1294	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1295	>	// Unknown machine code, let it crash. Then patch the decoder
1296	>	return false;
1297	>	}
1298	>
1299	>	// Zero target register in case of a load operation
1300	>	const int reg = (opcode >> 16) & 0x1f;
1301	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
1302	>	if (direction == 0)
1303	>	regs[reg] = 0;
1304	>	else {
1305	>	// FIXME: untested code
1306	>	unsigned long ea = regs[(opcode >> 21) & 0x1f];
1307	>	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
1308	>	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
1309	>	unsigned long value;
1310	>	if (direction > 0) {
1311	>	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
1312	>	value = regs[reg] & rmask;
1313	>	}
1314	>	else {
1315	>	const unsigned long lmask = (1L << (offset * 8)) - 1;
1316	>	value = regs[reg] & lmask;
1317	>	}
1318	>	// restore most significant bits
1319	>	if (transfer_size == SIZE_LONG)
1320	>	value = (signed long)(signed int)value;
1321	>	regs[reg] = value;
1322	>	}
1323	>	}
1324	>
1325	>	#if DEBUG
1326	>	#if (defined(_ABIN32) || defined(_ABI64))
1327	>	static const char * mips_gpr_names[32] = {
1328	>	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1329	>	"t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
1330	>	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1331	>	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1332	>	};
1333	>	#else
1334	>	static const char * mips_gpr_names[32] = {
1335	>	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1336	>	"a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
1337	>	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1338	>	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1339	>	};
1340	>	#endif
1341	>	printf("%s %s register %s\n",
1342	>	transfer_size == SIZE_BYTE ? "byte" :
1343	>	transfer_size == SIZE_WORD ? "word" :
1344	>	transfer_size == SIZE_LONG ? "long" :
1345	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1346	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1347	>	mips_gpr_names[reg]);
1348	>	#endif
1349	>
1350	>	*pc_p += 4;
1351	>	return true;
1352	>	}
1353	>	#endif
1354	>
1355	>	// Decode and skip SPARC instruction
1356	>	#if (defined(sparc) || defined(__sparc__))
1357	>	enum {
1358	>	#if (defined(__sun__))
1359	>	SPARC_REG_G1 = REG_G1,
1360	>	SPARC_REG_O0 = REG_O0,
1361	>	SPARC_REG_PC = REG_PC,
1362	>	SPARC_REG_nPC = REG_nPC
1363	>	#endif
1364	>	};
1365	>	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
1366	>	{
1367	>	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
1368	>
1369	>	if (pc == 0)
1370	>	return false;
1371	>
1372	>	#if DEBUG
1373	>	printf("IP: %p [%08x]\n", pc, pc[0]);
1374	>	#endif
1375	>
1376	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1377	>	transfer_size_t transfer_size = SIZE_LONG;
1378	>	bool register_pair = false;
1379	>
1380	>	const unsigned int opcode = pc[0];
1381	>	if ((opcode >> 30) != 3)
1382	>	return false;
1383	>	switch ((opcode >> 19) & 0x3f) {
1384	>	case 9: // Load Signed Byte
1385	>	case 1: // Load Unsigned Byte
1386	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1387	>	transfer_size = SIZE_BYTE;
1388	>	break;
1389	>	case 10:// Load Signed Halfword
1390	>	case 2: // Load Unsigned Word
1391	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1392	>	transfer_size = SIZE_WORD;
1393	>	break;
1394	>	case 8: // Load Word
1395	>	case 0: // Load Unsigned Word
1396	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1397	>	transfer_size = SIZE_LONG;
1398	>	break;
1399	>	case 11:// Load Extended Word
1400	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1401	>	transfer_size = SIZE_QUAD;
1402	>	break;
1403	>	case 3: // Load Doubleword
1404	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1405	>	transfer_size = SIZE_LONG;
1406	>	register_pair = true;
1407	>	break;
1408	>	case 5: // Store Byte
1409	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1410	>	transfer_size = SIZE_BYTE;
1411	>	break;
1412	>	case 6: // Store Halfword
1413	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1414	>	transfer_size = SIZE_WORD;
1415	>	break;
1416	>	case 4: // Store Word
1417	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1418	>	transfer_size = SIZE_LONG;
1419	>	break;
1420	>	case 14:// Store Extended Word
1421	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1422	>	transfer_size = SIZE_QUAD;
1423	>	break;
1424	>	case 7: // Store Doubleword
1425	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1426	>	transfer_size = SIZE_LONG;
1427	>	register_pair = true;
1428	>	break;
1429	>	}
1430	>
1431	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1432	>	// Unknown machine code, let it crash. Then patch the decoder
1433	>	return false;
1434	>	}
1435	>
1436	>	const int reg = (opcode >> 25) & 0x1f;
1437	>
1438	>	#if DEBUG
1439	>	static const char * reg_names[] = {
1440	>	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
1441	>	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
1442	>	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
1443	>	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
1444	>	};
1445	>	printf("%s %s register %s\n",
1446	>	transfer_size == SIZE_BYTE ? "byte" :
1447	>	transfer_size == SIZE_WORD ? "word" :
1448	>	transfer_size == SIZE_LONG ? "long" :
1449	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1450	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1451	>	reg_names[reg]);
1452	>	#endif
1453	>
1454	>	// Zero target register in case of a load operation
1455	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
1456	>	// FIXME: code to handle local & input registers is not tested
1457	>	if (reg >= 1 && reg < 8) {
1458	>	// global registers
1459	>	regs[reg - 1 + SPARC_REG_G1] = 0;
1460	>	}
1461	>	else if (reg >= 8 && reg < 16) {
1462	>	// output registers
1463	>	regs[reg - 8 + SPARC_REG_O0] = 0;
1464	>	}
1465	>	else if (reg >= 16 && reg < 24) {
1466	>	// local registers (in register windows)
1467	>	if (gwins)
1468	>	gwins->wbuf->rw_local[reg - 16] = 0;
1469	>	else
1470	>	rwin->rw_local[reg - 16] = 0;
1471	>	}
1472	>	else {
1473	>	// input registers (in register windows)
1474	>	if (gwins)
1475	>	gwins->wbuf->rw_in[reg - 24] = 0;
1476	>	else
1477	>	rwin->rw_in[reg - 24] = 0;
1478	>	}
1479	>	}
1480	>
1481	>	regs[SPARC_REG_PC] += 4;
1482	>	regs[SPARC_REG_nPC] += 4;
1483	>	return true;
1484		}
1485		#endif
1486		#endif
1487	+
1488	+	// Decode and skip ARM instruction
1489	+	#if (defined(arm) || defined(__arm__))
1490	+	enum {
1491	+	#if (defined(__linux__))
1492	+	ARM_REG_PC = 15,
1493	+	ARM_REG_CPSR = 16
1494	+	#endif
1495	+	};
1496	+	static bool arm_skip_instruction(unsigned long * regs)
1497	+	{
1498	+	unsigned int * pc = (unsigned int *)regs[ARM_REG_PC];
1499	+
1500	+	if (pc == 0)
1501	+	return false;
1502	+
1503	+	#if DEBUG
1504	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1505	+	#endif
1506	+
1507	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1508	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
1509	+	enum { op_sdt = 1, op_sdth = 2 };
1510	+	int op = 0;
1511	+
1512	+	// Handle load/store instructions only
1513	+	const unsigned int opcode = pc[0];
1514	+	switch ((opcode >> 25) & 7) {
1515	+	case 0: // Halfword and Signed Data Transfer (LDRH, STRH, LDRSB, LDRSH)
1516	+	op = op_sdth;
1517	+	// Determine transfer size (S/H bits)
1518	+	switch ((opcode >> 5) & 3) {
1519	+	case 0: // SWP instruction
1520	+	break;
1521	+	case 1: // Unsigned halfwords
1522	+	case 3: // Signed halfwords
1523	+	transfer_size = SIZE_WORD;
1524	+	break;
1525	+	case 2: // Signed byte
1526	+	transfer_size = SIZE_BYTE;
1527	+	break;
1528	+	}
1529	+	break;
1530	+	case 2:
1531	+	case 3: // Single Data Transfer (LDR, STR)
1532	+	op = op_sdt;
1533	+	// Determine transfer size (B bit)
1534	+	if (((opcode >> 22) & 1) == 1)
1535	+	transfer_size = SIZE_BYTE;
1536	+	else
1537	+	transfer_size = SIZE_LONG;
1538	+	break;
1539	+	default:
1540	+	// FIXME: support load/store mutliple?
1541	+	return false;
1542	+	}
1543	+
1544	+	// Check for invalid transfer size (SWP instruction?)
1545	+	if (transfer_size == SIZE_UNKNOWN)
1546	+	return false;
1547	+
1548	+	// Determine transfer type (L bit)
1549	+	if (((opcode >> 20) & 1) == 1)
1550	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1551	+	else
1552	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1553	+
1554	+	// Compute offset
1555	+	int offset;
1556	+	if (((opcode >> 25) & 1) == 0) {
1557	+	if (op == op_sdt)
1558	+	offset = opcode & 0xfff;
1559	+	else if (op == op_sdth) {
1560	+	int rm = opcode & 0xf;
1561	+	if (((opcode >> 22) & 1) == 0) {
1562	+	// register offset
1563	+	offset = regs[rm];
1564	+	}
1565	+	else {
1566	+	// immediate offset
1567	+	offset = ((opcode >> 4) & 0xf0) | (opcode & 0x0f);
1568	+	}
1569	+	}
1570	+	}
1571	+	else {
1572	+	const int rm = opcode & 0xf;
1573	+	const int sh = (opcode >> 7) & 0x1f;
1574	+	if (((opcode >> 4) & 1) == 1) {
1575	+	// we expect only legal load/store instructions
1576	+	printf("FATAL: invalid shift operand\n");
1577	+	return false;
1578	+	}
1579	+	const unsigned int v = regs[rm];
1580	+	switch ((opcode >> 5) & 3) {
1581	+	case 0: // logical shift left
1582	+	offset = sh ? v << sh : v;
1583	+	break;
1584	+	case 1: // logical shift right
1585	+	offset = sh ? v >> sh : 0;
1586	+	break;
1587	+	case 2: // arithmetic shift right
1588	+	if (sh)
1589	+	offset = ((signed int)v) >> sh;
1590	+	else
1591	+	offset = (v & 0x80000000) ? 0xffffffff : 0;
1592	+	break;
1593	+	case 3: // rotate right
1594	+	if (sh)
1595	+	offset = (v >> sh) | (v << (32 - sh));
1596	+	else
1597	+	offset = (v >> 1) | ((regs[ARM_REG_CPSR] << 2) & 0x80000000);
1598	+	break;
1599	+	}
1600	+	}
1601	+	if (((opcode >> 23) & 1) == 0)
1602	+	offset = -offset;
1603	+
1604	+	int rd = (opcode >> 12) & 0xf;
1605	+	int rn = (opcode >> 16) & 0xf;
1606	+	#if DEBUG
1607	+	static const char * reg_names[] = {
1608	+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1609	+	"r9", "r9", "sl", "fp", "ip", "sp", "lr", "pc"
1610	+	};
1611	+	printf("%s %s register %s\n",
1612	+	transfer_size == SIZE_BYTE ? "byte" :
1613	+	transfer_size == SIZE_WORD ? "word" :
1614	+	transfer_size == SIZE_LONG ? "long" : "unknown",
1615	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1616	+	reg_names[rd]);
1617	+	#endif
1618	+
1619	+	unsigned int base = regs[rn];
1620	+	if (((opcode >> 24) & 1) == 1)
1621	+	base += offset;
1622	+
1623	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD)
1624	+	regs[rd] = 0;
1625	+
1626	+	if (((opcode >> 24) & 1) == 0)                // post-index addressing
1627	+	regs[rn] += offset;
1628	+	else if (((opcode >> 21) & 1) == 1)   // write-back address into base
1629	+	regs[rn] = base;
1630	+
1631	+	regs[ARM_REG_PC] += 4;
1632	+	return true;
1633	+	}
1634		#endif
1635
1636	+
1637		// Fallbacks
1638		#ifndef SIGSEGV_FAULT_INSTRUCTION
1639		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
1640		#endif
1641	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
1642	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
1643	+	#endif
1644	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
1645	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
1646	+	#endif
1647
1648		// SIGSEGV recovery supported ?
1649		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 289 | Line 1655 | static sigsegv_address_t get_fault_addre
1655		*  SIGSEGV global handler
1656		*/
1657
1658	+	// This function handles the badaccess to memory.
1659	+	// It is called from the signal handler or the exception handler.
1660	+	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
1661	+	{
1662	+	#ifdef HAVE_MACH_EXCEPTIONS
1663	+	// We must match the initial count when writing back the CPU state registers
1664	+	kern_return_t krc;
1665	+	mach_msg_type_number_t count;
1666	+	SIGSEGV_THREAD_STATE_TYPE state;
1667	+
1668	+	count = SIGSEGV_THREAD_STATE_COUNT;
1669	+	krc = thread_get_state(thread, SIGSEGV_THREAD_STATE_FLAVOR, (thread_state_t)&state, &count);
1670	+	MACH_CHECK_ERROR (thread_get_state, krc);
1671	+	#endif
1672	+
1673	+	sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
1674	+	sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
1675	+
1676	+	// Call user's handler and reinstall the global handler, if required
1677	+	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
1678	+	case SIGSEGV_RETURN_SUCCESS:
1679	+	return true;
1680	+
1681	+	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1682	+	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
1683	+	// Call the instruction skipper with the register file
1684	+	// available
1685	+	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
1686	+	#ifdef HAVE_MACH_EXCEPTIONS
1687	+	// Unlike UNIX signals where the thread state
1688	+	// is modified off of the stack, in Mach we
1689	+	// need to actually call thread_set_state to
1690	+	// have the register values updated.
1691	+	krc = thread_set_state(thread,
1692	+	SIGSEGV_THREAD_STATE_FLAVOR, (thread_state_t)&state,
1693	+	count);
1694	+	MACH_CHECK_ERROR (thread_set_state, krc);
1695	+	#endif
1696	+	return true;
1697	+	}
1698	+	break;
1699	+	#endif
1700	+	case SIGSEGV_RETURN_FAILURE:
1701	+	// We can't do anything with the fault_address, dump state?
1702	+	if (sigsegv_state_dumper != 0)
1703	+	sigsegv_state_dumper(fault_address, fault_instruction);
1704	+	break;
1705	+	}
1706	+
1707	+	return false;
1708	+	}
1709	+
1710	+
1711	+	/*
1712	+	* There are two mechanisms for handling a bad memory access,
1713	+	* Mach exceptions and UNIX signals. The implementation specific
1714	+	* code appears below. Its reponsibility is to call handle_badaccess
1715	+	* which is the routine that handles the fault in an implementation
1716	+	* agnostic manner. The implementation specific code below is then
1717	+	* reponsible for checking whether handle_badaccess was able
1718	+	* to handle the memory access error and perform any implementation
1719	+	* specific tasks necessary afterwards.
1720	+	*/
1721	+
1722	+	#ifdef HAVE_MACH_EXCEPTIONS
1723	+	/*
1724	+	* We need to forward all exceptions that we do not handle.
1725	+	* This is important, there are many exceptions that may be
1726	+	* handled by other exception handlers. For example debuggers
1727	+	* use exceptions and the exception hander is in another
1728	+	* process in such a case. (Timothy J. Wood states in his
1729	+	* message to the list that he based this code on that from
1730	+	* gdb for Darwin.)
1731	+	*/
1732	+	static inline kern_return_t
1733	+	forward_exception(mach_port_t thread_port,
1734	+	mach_port_t task_port,
1735	+	exception_type_t exception_type,
1736	+	exception_data_t exception_data,
1737	+	mach_msg_type_number_t data_count,
1738	+	ExceptionPorts *oldExceptionPorts)
1739	+	{
1740	+	kern_return_t kret;
1741	+	unsigned int portIndex;
1742	+	mach_port_t port;
1743	+	exception_behavior_t behavior;
1744	+	thread_state_flavor_t flavor;
1745	+	thread_state_data_t thread_state;
1746	+	mach_msg_type_number_t thread_state_count;
1747	+
1748	+	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1749	+	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1750	+	// This handler wants the exception
1751	+	break;
1752	+	}
1753	+	}
1754	+
1755	+	if (portIndex >= oldExceptionPorts->maskCount) {
1756	+	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1757	+	return KERN_FAILURE;
1758	+	}
1759	+
1760	+	port = oldExceptionPorts->handlers[portIndex];
1761	+	behavior = oldExceptionPorts->behaviors[portIndex];
1762	+	flavor = oldExceptionPorts->flavors[portIndex];
1763	+
1764	+	if (!VALID_THREAD_STATE_FLAVOR(flavor)) {
1765	+	fprintf(stderr, "Invalid thread_state flavor = %d. Not forwarding\n", flavor);
1766	+	return KERN_FAILURE;
1767	+	}
1768	+
1769	+	/*
1770	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1771	+	*/
1772	+
1773	+	if (behavior != EXCEPTION_DEFAULT) {
1774	+	thread_state_count = THREAD_STATE_MAX;
1775	+	kret = thread_get_state (thread_port, flavor, (natural_t *)&thread_state,
1776	+	&thread_state_count);
1777	+	MACH_CHECK_ERROR (thread_get_state, kret);
1778	+	}
1779	+
1780	+	switch (behavior) {
1781	+	case EXCEPTION_DEFAULT:
1782	+	// fprintf(stderr, "forwarding to exception_raise\n");
1783	+	kret = exception_raise(port, thread_port, task_port, exception_type,
1784	+	exception_data, data_count);
1785	+	MACH_CHECK_ERROR (exception_raise, kret);
1786	+	break;
1787	+	case EXCEPTION_STATE:
1788	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
1789	+	kret = exception_raise_state(port, exception_type, exception_data,
1790	+	data_count, &flavor,
1791	+	(natural_t *)&thread_state, thread_state_count,
1792	+	(natural_t *)&thread_state, &thread_state_count);
1793	+	MACH_CHECK_ERROR (exception_raise_state, kret);
1794	+	break;
1795	+	case EXCEPTION_STATE_IDENTITY:
1796	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1797	+	kret = exception_raise_state_identity(port, thread_port, task_port,
1798	+	exception_type, exception_data,
1799	+	data_count, &flavor,
1800	+	(natural_t *)&thread_state, thread_state_count,
1801	+	(natural_t *)&thread_state, &thread_state_count);
1802	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1803	+	break;
1804	+	default:
1805	+	fprintf(stderr, "forward_exception got unknown behavior\n");
1806	+	kret = KERN_FAILURE;
1807	+	break;
1808	+	}
1809	+
1810	+	if (behavior != EXCEPTION_DEFAULT) {
1811	+	kret = thread_set_state (thread_port, flavor, (natural_t *)&thread_state,
1812	+	thread_state_count);
1813	+	MACH_CHECK_ERROR (thread_set_state, kret);
1814	+	}
1815	+
1816	+	return kret;
1817	+	}
1818	+
1819	+	/*
1820	+	* This is the code that actually handles the exception.
1821	+	* It is called by exc_server. For Darwin 5 Apple changed
1822	+	* this a bit from how this family of functions worked in
1823	+	* Mach. If you are familiar with that it is a little
1824	+	* different. The main variation that concerns us here is
1825	+	* that code is an array of exception specific codes and
1826	+	* codeCount is a count of the number of codes in the code
1827	+	* array. In typical Mach all exceptions have a code
1828	+	* and sub-code. It happens to be the case that for a
1829	+	* EXC_BAD_ACCESS exception the first entry is the type of
1830	+	* bad access that occurred and the second entry is the
1831	+	* faulting address so these entries correspond exactly to
1832	+	* how the code and sub-code are used on Mach.
1833	+	*
1834	+	* This is a MIG interface. No code in Basilisk II should
1835	+	* call this directley. This has to have external C
1836	+	* linkage because that is what exc_server expects.
1837	+	*/
1838	+	kern_return_t
1839	+	catch_exception_raise(mach_port_t exception_port,
1840	+	mach_port_t thread,
1841	+	mach_port_t task,
1842	+	exception_type_t exception,
1843	+	exception_data_t code,
1844	+	mach_msg_type_number_t code_count)
1845	+	{
1846	+	kern_return_t krc;
1847	+
1848	+	if (exception == EXC_BAD_ACCESS) {
1849	+	switch (code[0]) {
1850	+	case KERN_PROTECTION_FAILURE:
1851	+	case KERN_INVALID_ADDRESS:
1852	+	{
1853	+	#ifdef SIGSEGV_EXCEPTION_STATE_TYPE
1854	+	SIGSEGV_EXCEPTION_STATE_TYPE exc_state;
1855	+	mach_msg_type_number_t exc_state_count;
1856	+	exc_state_count = SIGSEGV_EXCEPTION_STATE_COUNT;
1857	+	krc = thread_get_state(thread, SIGSEGV_EXCEPTION_STATE_FLAVOR, (natural_t *)&exc_state, &exc_state_count);
1858	+	MACH_CHECK_ERROR (thread_get_state, krc);
1859	+	#endif
1860	+
1861	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1862	+	return KERN_SUCCESS;
1863	+	break;
1864	+	}
1865	+	}
1866	+	}
1867	+
1868	+	// In Mach we do not need to remove the exception handler.
1869	+	// If we forward the exception, eventually some exception handler
1870	+	// will take care of this exception.
1871	+	krc = forward_exception(thread, task, exception, code, code_count, &ports);
1872	+
1873	+	return krc;
1874	+	}
1875	+	#endif
1876	+
1877		#ifdef HAVE_SIGSEGV_RECOVERY
1878	+	// Handle bad memory accesses with signal handler
1879		static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1880		{
1881	<	// Call user's handler and reinstall the global handler, if required
1882	<	if (sigsegv_user_handler((sigsegv_address_t)SIGSEGV_FAULT_ADDRESS, (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION)) {
1881	>	// Call handler and reinstall the global handler, if required
1882	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1883		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1884		sigsegv_do_install_handler(sig);
1885		#endif
1886	+	return;
1887		}
1888	<	else {
1889	<	// FAIL: reinstall default handler for "safe" crash
1888	>
1889	>	// Failure: reinstall default handler for "safe" crash
1890		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1891	<	SIGSEGV_ALL_SIGNALS
1891	>	SIGSEGV_ALL_SIGNALS
1892		#undef FAULT_HANDLER
306	–	}
1893		}
1894		#endif
1895
#	Line 317 | Line 1903 | static bool sigsegv_do_install_handler(i
1903		{
1904		// Setup SIGSEGV handler to process writes to frame buffer
1905		#ifdef HAVE_SIGACTION
1906	<	struct sigaction vosf_sa;
1907	<	sigemptyset(&vosf_sa.sa_mask);
1908	<	vosf_sa.sa_sigaction = sigsegv_handler;
1909	<	vosf_sa.sa_flags = SA_SIGINFO;
1910	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1906	>	struct sigaction sigsegv_sa;
1907	>	sigemptyset(&sigsegv_sa.sa_mask);
1908	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1909	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1910	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1911		#else
1912		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1913		#endif
#	Line 333 | Line 1919 | static bool sigsegv_do_install_handler(i
1919		{
1920		// Setup SIGSEGV handler to process writes to frame buffer
1921		#ifdef HAVE_SIGACTION
1922	<	struct sigaction vosf_sa;
1923	<	sigemptyset(&vosf_sa.sa_mask);
1924	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1922	>	struct sigaction sigsegv_sa;
1923	>	sigemptyset(&sigsegv_sa.sa_mask);
1924	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1925	>	sigsegv_sa.sa_flags = 0;
1926		#if !EMULATED_68K && defined(__NetBSD__)
1927	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1928	<	vosf_sa.sa_flags = SA_ONSTACK;
342	<	#else
343	<	vosf_sa.sa_flags = 0;
1927	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1928	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1929		#endif
1930	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1930	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1931		#else
1932		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1933		#endif
1934		}
1935		#endif
1936
1937	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
1937	>	#if defined(HAVE_MACH_EXCEPTIONS)
1938	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1939		{
1940	<	#ifdef HAVE_SIGSEGV_RECOVERY
1941	<	sigsegv_user_handler = handler;
1940	>	/*
1941	>	* Except for the exception port functions, this should be
1942	>	* pretty much stock Mach. If later you choose to support
1943	>	* other Mach's besides Darwin, just check for __MACH__
1944	>	* here and __APPLE__ where the actual differences are.
1945	>	*/
1946	>	#if defined(__APPLE__) && defined(__MACH__)
1947	>	if (sigsegv_fault_handler != NULL) {
1948	>	sigsegv_fault_handler = handler;
1949	>	return true;
1950	>	}
1951	>
1952	>	kern_return_t krc;
1953	>
1954	>	// create the the exception port
1955	>	krc = mach_port_allocate(mach_task_self(),
1956	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1957	>	if (krc != KERN_SUCCESS) {
1958	>	mach_error("mach_port_allocate", krc);
1959	>	return false;
1960	>	}
1961	>
1962	>	// add a port send right
1963	>	krc = mach_port_insert_right(mach_task_self(),
1964	>	_exceptionPort, _exceptionPort,
1965	>	MACH_MSG_TYPE_MAKE_SEND);
1966	>	if (krc != KERN_SUCCESS) {
1967	>	mach_error("mach_port_insert_right", krc);
1968	>	return false;
1969	>	}
1970	>
1971	>	// get the old exception ports
1972	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1973	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1974	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1975	>	if (krc != KERN_SUCCESS) {
1976	>	mach_error("thread_get_exception_ports", krc);
1977	>	return false;
1978	>	}
1979	>
1980	>	// set the new exception port
1981	>	//
1982	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1983	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1984	>	// message, but it turns out that in the common case this is not
1985	>	// neccessary. If we need it we can later ask for it from the
1986	>	// suspended thread.
1987	>	//
1988	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1989	>	// counter in the thread state.  The comments in the header file
1990	>	// seem to imply that you can count on the GPR's on an exception
1991	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1992	>	// you have to ask for all of the GPR's anyway just to get the
1993	>	// program counter. In any case because of update effective
1994	>	// address from immediate and update address from effective
1995	>	// addresses of ra and rb modes (as good an name as any for these
1996	>	// addressing modes) used in PPC instructions, you will need the
1997	>	// GPR state anyway.
1998	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1999	>	EXCEPTION_DEFAULT, SIGSEGV_THREAD_STATE_FLAVOR);
2000	>	if (krc != KERN_SUCCESS) {
2001	>	mach_error("thread_set_exception_ports", krc);
2002	>	return false;
2003	>	}
2004	>
2005	>	// create the exception handler thread
2006	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
2007	>	(void)fprintf(stderr, "creation of exception thread failed\n");
2008	>	return false;
2009	>	}
2010	>
2011	>	// do not care about the exception thread any longer, let is run standalone
2012	>	(void)pthread_detach(exc_thread);
2013	>
2014	>	sigsegv_fault_handler = handler;
2015	>	return true;
2016	>	#else
2017	>	return false;
2018	>	#endif
2019	>	}
2020	>	#endif
2021	>
2022	>	#ifdef HAVE_WIN32_EXCEPTIONS
2023	>	static LONG WINAPI main_exception_filter(EXCEPTION_POINTERS *ExceptionInfo)
2024	>	{
2025	>	if (sigsegv_fault_handler != NULL
2026	>	&& ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
2027	>	&& ExceptionInfo->ExceptionRecord->NumberParameters == 2
2028	>	&& handle_badaccess(ExceptionInfo))
2029	>	return EXCEPTION_CONTINUE_EXECUTION;
2030	>
2031	>	return EXCEPTION_CONTINUE_SEARCH;
2032	>	}
2033	>
2034	>	#if defined __CYGWIN__ && defined __i386__
2035	>	/* In Cygwin programs, SetUnhandledExceptionFilter has no effect because Cygwin
2036	>	installs a global exception handler.  We have to dig deep in order to install
2037	>	our main_exception_filter.  */
2038	>
2039	>	/* Data structures for the current thread's exception handler chain.
2040	>	On the x86 Windows uses register fs, offset 0 to point to the current
2041	>	exception handler; Cygwin mucks with it, so we must do the same... :-/ */
2042	>
2043	>	/* Magic taken from winsup/cygwin/include/exceptions.h.  */
2044	>
2045	>	struct exception_list {
2046	>	struct exception_list *prev;
2047	>	int (*handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
2048	>	};
2049	>	typedef struct exception_list exception_list;
2050	>
2051	>	/* Magic taken from winsup/cygwin/exceptions.cc.  */
2052	>
2053	>	__asm__ (".equ __except_list,0");
2054	>
2055	>	extern exception_list *_except_list __asm__ ("%fs:__except_list");
2056	>
2057	>	/* For debugging.  _except_list is not otherwise accessible from gdb.  */
2058	>	static exception_list *
2059	>	debug_get_except_list ()
2060	>	{
2061	>	return _except_list;
2062	>	}
2063	>
2064	>	/* Cygwin's original exception handler.  */
2065	>	static int (*cygwin_exception_handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
2066	>
2067	>	/* Our exception handler.  */
2068	>	static int
2069	>	libsigsegv_exception_handler (EXCEPTION_RECORD *exception, void *frame, CONTEXT *context, void *dispatch)
2070	>	{
2071	>	EXCEPTION_POINTERS ExceptionInfo;
2072	>	ExceptionInfo.ExceptionRecord = exception;
2073	>	ExceptionInfo.ContextRecord = context;
2074	>	if (main_exception_filter (&ExceptionInfo) == EXCEPTION_CONTINUE_SEARCH)
2075	>	return cygwin_exception_handler (exception, frame, context, dispatch);
2076	>	else
2077	>	return 0;
2078	>	}
2079	>
2080	>	static void
2081	>	do_install_main_exception_filter ()
2082	>	{
2083	>	/* We cannot insert any handler into the chain, because such handlers
2084	>	must lie on the stack (?).  Instead, we have to replace(!) Cygwin's
2085	>	global exception handler.  */
2086	>	cygwin_exception_handler = _except_list->handler;
2087	>	_except_list->handler = libsigsegv_exception_handler;
2088	>	}
2089	>
2090	>	#else
2091	>
2092	>	static void
2093	>	do_install_main_exception_filter ()
2094	>	{
2095	>	SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) &main_exception_filter);
2096	>	}
2097	>	#endif
2098	>
2099	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
2100	>	{
2101	>	static bool main_exception_filter_installed = false;
2102	>	if (!main_exception_filter_installed) {
2103	>	do_install_main_exception_filter();
2104	>	main_exception_filter_installed = true;
2105	>	}
2106	>	sigsegv_fault_handler = handler;
2107	>	return true;
2108	>	}
2109	>	#endif
2110	>
2111	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
2112	>	{
2113	>	#if defined(HAVE_SIGSEGV_RECOVERY)
2114		bool success = true;
2115		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
2116		SIGSEGV_ALL_SIGNALS
2117		#undef FAULT_HANDLER
2118	+	if (success)
2119	+	sigsegv_fault_handler = handler;
2120		return success;
2121	+	#elif defined(HAVE_MACH_EXCEPTIONS) || defined(HAVE_WIN32_EXCEPTIONS)
2122	+	return sigsegv_do_install_handler(handler);
2123		#else
2124		// FAIL: no siginfo_t nor sigcontext subterfuge is available
2125		return false;
#	Line 371 | Line 2133 | bool sigsegv_install_handler(sigsegv_han
2133
2134		void sigsegv_deinstall_handler(void)
2135		{
2136	+	// We do nothing for Mach exceptions, the thread would need to be
2137	+	// suspended if not already so, and we might mess with other
2138	+	// exception handlers that came after we registered ours. There is
2139	+	// no need to remove the exception handler, in fact this function is
2140	+	// not called anywhere in Basilisk II.
2141		#ifdef HAVE_SIGSEGV_RECOVERY
2142	<	sigsegv_user_handler = 0;
2142	>	sigsegv_fault_handler = 0;
2143		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
2144		SIGSEGV_ALL_SIGNALS
2145		#undef FAULT_HANDLER
2146		#endif
2147	+	#ifdef HAVE_WIN32_EXCEPTIONS
2148	+	sigsegv_fault_handler = NULL;
2149	+	#endif
2150	+	}
2151	+
2152	+
2153	+	/*
2154	+	*  Set callback function when we cannot handle the fault
2155	+	*/
2156	+
2157	+	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
2158	+	{
2159	+	sigsegv_state_dumper = handler;
2160		}
2161
2162	+
2163		/*
2164		*  Test program used for configure/test
2165		*/
#	Line 387 | Line 2168 | void sigsegv_deinstall_handler(void)
2168		#include <stdio.h>
2169		#include <stdlib.h>
2170		#include <fcntl.h>
2171	+	#ifdef HAVE_SYS_MMAN_H
2172		#include <sys/mman.h>
2173	+	#endif
2174		#include "vm_alloc.h"
2175
2176	+	const int REF_INDEX = 123;
2177	+	const int REF_VALUE = 45;
2178	+
2179		static int page_size;
2180		static volatile char * page = 0;
2181		static volatile int handler_called = 0;
2182
2183	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2183	>	/* Barriers */
2184	>	#ifdef __GNUC__
2185	>	#define BARRIER() asm volatile ("" : : : "memory")
2186	>	#else
2187	>	#define BARRIER() /* nothing */
2188	>	#endif
2189	>
2190	>	#ifdef __GNUC__
2191	>	// Code range where we expect the fault to come from
2192	>	static void *b_region, *e_region;
2193	>	#endif
2194	>
2195	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2196		{
2197	+	#if DEBUG
2198	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
2199	+	printf("expected fault at %p\n", page + REF_INDEX);
2200	+	#ifdef __GNUC__
2201	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
2202	+	#endif
2203	+	#endif
2204		handler_called++;
2205	<	if ((fault_address - 123) != page)
2206	<	exit(1);
2205	>	if ((fault_address - REF_INDEX) != page)
2206	>	exit(10);
2207	>	#ifdef __GNUC__
2208	>	// Make sure reported fault instruction address falls into
2209	>	// expected code range
2210	>	if (instruction_address != SIGSEGV_INVALID_PC
2211	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
2212	>	(instruction_address >= (sigsegv_address_t)e_region)))
2213	>	exit(11);
2214	>	#endif
2215		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
2216	<	exit(1);
2216	>	exit(12);
2217	>	return SIGSEGV_RETURN_SUCCESS;
2218	>	}
2219	>
2220	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2221	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2222	>	{
2223	>	#if DEBUG
2224	>	printf("sigsegv_insn_handler(%p, %p)\n", fault_address, instruction_address);
2225	>	#endif
2226	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
2227	>	#ifdef __GNUC__
2228	>	// Make sure reported fault instruction address falls into
2229	>	// expected code range
2230	>	if (instruction_address != SIGSEGV_INVALID_PC
2231	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
2232	>	(instruction_address >= (sigsegv_address_t)e_region)))
2233	>	return SIGSEGV_RETURN_FAILURE;
2234	>	#endif
2235	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
2236	>	}
2237	>
2238	>	return SIGSEGV_RETURN_FAILURE;
2239	>	}
2240	>
2241	>	// More sophisticated tests for instruction skipper
2242	>	static bool arch_insn_skipper_tests()
2243	>	{
2244	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
2245	>	static const unsigned char code[] = {
2246	>	0x8a, 0x00,                    // mov    (%eax),%al
2247	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
2248	>	0x88, 0x20,                    // mov    %ah,(%eax)
2249	>	0x88, 0x08,                    // mov    %cl,(%eax)
2250	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
2251	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
2252	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
2253	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
2254	>	0x8b, 0x00,                    // mov    (%eax),%eax
2255	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
2256	>	0x89, 0x00,                    // mov    %eax,(%eax)
2257	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
2258	>	#if defined(__x86_64__)
2259	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
2260	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
2261	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
2262	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
2263	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
2264	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
2265	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
2266	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
2267	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
2268	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
2269	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
2270	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
2271	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
2272	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
2273	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
2274	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
2275	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
2276	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
2277	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
2278	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
2279	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
2280	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
2281	>	0x63, 0x47, 0x04,              // movslq 4(%rdi),%eax
2282	>	0x48, 0x63, 0x47, 0x04,        // movslq 4(%rdi),%rax
2283	>	#endif
2284	>	0                              // end
2285	>	};
2286	>	const int N_REGS = 20;
2287	>	unsigned long regs[N_REGS];
2288	>	for (int i = 0; i < N_REGS; i++)
2289	>	regs[i] = i;
2290	>	const unsigned long start_code = (unsigned long)&code;
2291	>	regs[X86_REG_EIP] = start_code;
2292	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
2293	>	&& ix86_skip_instruction(regs))
2294	>	; /* simply iterate */
2295	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
2296	>	#endif
2297		return true;
2298		}
2299	+	#endif
2300
2301		int main(void)
2302		{
2303		if (vm_init() < 0)
2304		return 1;
2305
2306	<	page_size = getpagesize();
2306	>	page_size = vm_get_page_size();
2307		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
2308	<	return 1;
2308	>	return 2;
2309
2310	+	memset((void *)page, 0, page_size);
2311		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
2312	<	return 1;
2312	>	return 3;
2313
2314		if (!sigsegv_install_handler(sigsegv_test_handler))
2315	<	return 1;
421	<
422	<	page[123] = 45;
423	<	page[123] = 45;
2315	>	return 4;
2316
2317	+	#ifdef __GNUC__
2318	+	b_region = &&L_b_region1;
2319	+	e_region = &&L_e_region1;
2320	+	#endif
2321	+	L_b_region1:
2322	+	page[REF_INDEX] = REF_VALUE;
2323	+	if (page[REF_INDEX] != REF_VALUE)
2324	+	exit(20);
2325	+	page[REF_INDEX] = REF_VALUE;
2326	+	BARRIER();
2327	+	L_e_region1:
2328	+
2329		if (handler_called != 1)
2330	<	return 1;
2330	>	return 5;
2331	>
2332	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2333	>	if (!sigsegv_install_handler(sigsegv_insn_handler))
2334	>	return 6;
2335	>
2336	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
2337	>	return 7;
2338	>
2339	>	for (int i = 0; i < page_size; i++)
2340	>	page[i] = (i + 1) % page_size;
2341	>
2342	>	if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
2343	>	return 8;
2344	>
2345	>	#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
2346	>	const unsigned long TAG = 0x12345678 |                  \
2347	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
2348	>	TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
2349	>	volatile unsigned long effect = data + TAG;             \
2350	>	if (effect != TAG)                                                              \
2351	>	return 9;                                                                       \
2352	>	} while (0)
2353	>
2354	>	#ifdef __GNUC__
2355	>	b_region = &&L_b_region2;
2356	>	e_region = &&L_e_region2;
2357	>	#endif
2358	>	L_b_region2:
2359	>	TEST_SKIP_INSTRUCTION(unsigned char);
2360	>	TEST_SKIP_INSTRUCTION(unsigned short);
2361	>	TEST_SKIP_INSTRUCTION(unsigned int);
2362	>	TEST_SKIP_INSTRUCTION(unsigned long);
2363	>	TEST_SKIP_INSTRUCTION(signed char);
2364	>	TEST_SKIP_INSTRUCTION(signed short);
2365	>	TEST_SKIP_INSTRUCTION(signed int);
2366	>	TEST_SKIP_INSTRUCTION(signed long);
2367	>	BARRIER();
2368	>	L_e_region2:
2369	>
2370	>	if (!arch_insn_skipper_tests())
2371	>	return 20;
2372	>	#endif
2373
2374		vm_exit();
2375		return 0;

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