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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.5 by gbeauche, 2001-07-07T09:12:15Z vs.
Revision 1.52 by gbeauche, 2005-01-30T21:42:14Z

#	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) 1997-2001 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 size
70	+	enum transfer_size_t {
71	+	SIZE_UNKNOWN,
72	+	SIZE_BYTE,
73	+	SIZE_WORD, // 2 bytes
74	+	SIZE_LONG, // 4 bytes
75	+	SIZE_QUAD, // 8 bytes
76	+	};
77	+
78	+	// Transfer type
79	+	typedef sigsegv_transfer_type_t transfer_type_t;
80	+
81	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
82	+	// Addressing mode
83	+	enum addressing_mode_t {
84	+	MODE_UNKNOWN,
85	+	MODE_NORM,
86	+	MODE_U,
87	+	MODE_X,
88	+	MODE_UX
89	+	};
90	+
91	+	// Decoded instruction
92	+	struct instruction_t {
93	+	transfer_type_t         transfer_type;
94	+	transfer_size_t         transfer_size;
95	+	addressing_mode_t       addr_mode;
96	+	unsigned int            addr;
97	+	char                            ra, rd;
98	+	};
99	+
100	+	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned long * gpr)
101	+	{
102	+	// Get opcode and divide into fields
103	+	unsigned int opcode = *((unsigned int *)(unsigned long)nip);
104	+	unsigned int primop = opcode >> 26;
105	+	unsigned int exop = (opcode >> 1) & 0x3ff;
106	+	unsigned int ra = (opcode >> 16) & 0x1f;
107	+	unsigned int rb = (opcode >> 11) & 0x1f;
108	+	unsigned int rd = (opcode >> 21) & 0x1f;
109	+	signed int imm = (signed short)(opcode & 0xffff);
110	+
111	+	// Analyze opcode
112	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
113	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
114	+	addressing_mode_t addr_mode = MODE_UNKNOWN;
115	+	switch (primop) {
116	+	case 31:
117	+	switch (exop) {
118	+	case 23:        // lwzx
119	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
120	+	case 55:        // lwzux
121	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
122	+	case 87:        // lbzx
123	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
124	+	case 119:       // lbzux
125	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
126	+	case 151:       // stwx
127	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
128	+	case 183:       // stwux
129	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
130	+	case 215:       // stbx
131	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
132	+	case 247:       // stbux
133	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
134	+	case 279:       // lhzx
135	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
136	+	case 311:       // lhzux
137	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
138	+	case 343:       // lhax
139	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
140	+	case 375:       // lhaux
141	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
142	+	case 407:       // sthx
143	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
144	+	case 439:       // sthux
145	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
146	+	}
147	+	break;
148	+
149	+	case 32:        // lwz
150	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
151	+	case 33:        // lwzu
152	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
153	+	case 34:        // lbz
154	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
155	+	case 35:        // lbzu
156	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
157	+	case 36:        // stw
158	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
159	+	case 37:        // stwu
160	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
161	+	case 38:        // stb
162	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
163	+	case 39:        // stbu
164	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
165	+	case 40:        // lhz
166	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
167	+	case 41:        // lhzu
168	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
169	+	case 42:        // lha
170	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
171	+	case 43:        // lhau
172	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
173	+	case 44:        // sth
174	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
175	+	case 45:        // sthu
176	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
177	+	case 58:        // ld, ldu, lwa
178	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
179	+	transfer_size = SIZE_QUAD;
180	+	addr_mode = ((opcode & 3) == 1) ? MODE_U : MODE_NORM;
181	+	imm &= ~3;
182	+	break;
183	+	case 62:        // std, stdu, stq
184	+	transfer_type = SIGSEGV_TRANSFER_STORE;
185	+	transfer_size = SIZE_QUAD;
186	+	addr_mode = ((opcode & 3) == 1) ? MODE_U : MODE_NORM;
187	+	imm &= ~3;
188	+	break;
189	+	}
190	+
191	+	// Calculate effective address
192	+	unsigned int addr = 0;
193	+	switch (addr_mode) {
194	+	case MODE_X:
195	+	case MODE_UX:
196	+	if (ra == 0)
197	+	addr = gpr[rb];
198	+	else
199	+	addr = gpr[ra] + gpr[rb];
200	+	break;
201	+	case MODE_NORM:
202	+	case MODE_U:
203	+	if (ra == 0)
204	+	addr = (signed int)(signed short)imm;
205	+	else
206	+	addr = gpr[ra] + (signed int)(signed short)imm;
207	+	break;
208	+	default:
209	+	break;
210	+	}
211	+
212	+	// Commit decoded instruction
213	+	instruction->addr = addr;
214	+	instruction->addr_mode = addr_mode;
215	+	instruction->transfer_type = transfer_type;
216	+	instruction->transfer_size = transfer_size;
217	+	instruction->ra = ra;
218	+	instruction->rd = rd;
219	+	}
220	+	#endif
221	+
222	+
223	+	/*
224		*  OS-dependant SIGSEGV signals support section
225		*/
226
227		#if HAVE_SIGINFO_T
228		// Generic extended signal handler
229	+	#if defined(__FreeBSD__)
230	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
231	+	#else
232		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
233	+	#endif
234		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
235	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t *sip, void *scp
236	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sip, scp
237		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
238	+	#if (defined(sgi) || defined(__sgi))
239	+	#include <ucontext.h>
240	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
241	+	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)SIGSEGV_CONTEXT_REGS[CTX_EPC]
242	+	#if (defined(mips) || defined(__mips))
243	+	#define SIGSEGV_REGISTER_FILE                   SIGSEGV_CONTEXT_REGS
244	+	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
245	+	#endif
246	+	#endif
247	+	#if defined(__sun__)
248	+	#if (defined(sparc) || defined(__sparc__))
249	+	#include <sys/stack.h>
250	+	#include <sys/regset.h>
251	+	#include <sys/ucontext.h>
252	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
253	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[REG_PC]
254	+	#define SIGSEGV_SPARC_GWINDOWS                  (((ucontext_t *)scp)->uc_mcontext.gwins)
255	+	#define SIGSEGV_SPARC_RWINDOW                   (struct rwindow *)((char *)SIGSEGV_CONTEXT_REGS[REG_SP] + STACK_BIAS)
256	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)SIGSEGV_CONTEXT_REGS), SIGSEGV_SPARC_GWINDOWS, SIGSEGV_SPARC_RWINDOW
257	+	#define SIGSEGV_SKIP_INSTRUCTION                sparc_skip_instruction
258	+	#endif
259	+	#endif
260	+	#if defined(__FreeBSD__)
261	+	#if (defined(i386) || defined(__i386__))
262	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
263	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
264	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
265	+	#endif
266	+	#endif
267	+	#if defined(__NetBSD__)
268	+	#if (defined(i386) || defined(__i386__))
269	+	#include <sys/ucontext.h>
270	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.__gregs)
271	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[_REG_EIP]
272	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
273	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
274	+	#endif
275	+	#endif
276		#if defined(__linux__)
277	+	#if (defined(i386) || defined(__i386__))
278	+	#include <sys/ucontext.h>
279	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
280	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
281	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
282	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
283	+	#endif
284	+	#if (defined(x86_64) || defined(__x86_64__))
285	+	#include <sys/ucontext.h>
286	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
287	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
288	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
289	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
290	+	#endif
291		#if (defined(ia64) || defined(__ia64__))
292		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
293		#endif
294	+	#if (defined(powerpc) || defined(__powerpc__))
295	+	#include <sys/ucontext.h>
296	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
297	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
298	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned long *)(SIGSEGV_CONTEXT_REGS->gpr)
299	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
300	+	#endif
301	+	#if (defined(hppa) || defined(__hppa__))
302	+	#undef  SIGSEGV_FAULT_ADDRESS
303	+	#define SIGSEGV_FAULT_ADDRESS                   sip->si_ptr
304	+	#endif
305	+	#if (defined(arm) || defined(__arm__))
306	+	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
307	+	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
308	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.arm_pc)
309	+	#define SIGSEGV_REGISTER_FILE                   (&SIGSEGV_CONTEXT_REGS.arm_r0)
310	+	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
311	+	#endif
312		#endif
313		#endif
314
#	Line 70 | Line 319 | static bool sigsegv_do_install_handler(i
319		#if (defined(i386) || defined(__i386__))
320		#include <asm/sigcontext.h>
321		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
322	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
323	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
322	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
323	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
324	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
325	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
326	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
327	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
328		#endif
329		#if (defined(sparc) || defined(__sparc__))
330		#include <asm/sigcontext.h>
331		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
332	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
333		#define SIGSEGV_FAULT_ADDRESS                   addr
334		#endif
335		#if (defined(powerpc) || defined(__powerpc__))
336		#include <asm/sigcontext.h>
337		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
338	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
339		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
340		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
341	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&scp->regs->nip, (unsigned long *)(scp->regs->gpr)
342	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
343		#endif
344		#if (defined(alpha) || defined(__alpha__))
345		#include <asm/sigcontext.h>
346		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
347	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
348		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
349		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
350	<
351	<	// From Boehm's GC 6.0alpha8
352	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
353	<	{
354	<	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
355	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
356	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
357	<	return (sigsegv_address_t)fault_address;
358	<	}
350	>	#endif
351	>	#if (defined(arm) || defined(__arm__))
352	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int r1, int r2, int r3, struct sigcontext sc
353	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
354	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &sc
355	>	#define SIGSEGV_FAULT_ADDRESS                   scp->fault_address
356	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->arm_pc
357	>	#define SIGSEGV_REGISTER_FILE                   &scp->arm_r0
358	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
359		#endif
360		#endif
361
362		// Irix 5 or 6 on MIPS
363	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
363	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
364	>	#include <ucontext.h>
365		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
366	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
366	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
367	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
368	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
369		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
370		#endif
371
372	+	// HP-UX
373	+	#if (defined(hpux) || defined(__hpux__))
374	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
375	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
376	+	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
377	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
378	+	#endif
379	+
380		// OSF/1 on Alpha
381		#if defined(__osf__)
382	+	#include <ucontext.h>
383		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
384	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
385		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
386		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
387		#endif
#	Line 118 | Line 389 | static sigsegv_address_t get_fault_addre
389		// AIX
390		#if defined(_AIX)
391		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
392	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
393		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
394		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
395		#endif
396
397	<	// NetBSD or FreeBSD
398	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
397	>	// NetBSD
398	>	#if defined(__NetBSD__)
399		#if (defined(m68k) || defined(__m68k__))
400		#include <m68k/frame.h>
401		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
402	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
403	<	struct sigstate {                                                                                                                                                                       \
132	<	int ss_flags;                                                                                                                                                                   \
133	<	struct frame ss_frame;                                                                                                                                                  \
134	<	};                                                                                                                                                                                                      \
135	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
136	<	char *fault_addr;                                                                                                                                                                       \
137	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
138	<	case 7:         /* 68040 access error */                                                                                                                                \
139	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
140	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
141	<	break;                                                                                                                                                                                  \
142	<	default:                                                                                                                                                                                        \
143	<	fault_addr = (char *)code;                                                                                                                                              \
144	<	break;                                                                                                                                                                                  \
145	<	}                                                                                                                                                                                                       \
146	<	fault_addr;                                                                                                                                                                                     \
147	<	})
402	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
403	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
404		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
405	<	#else
406	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
407	<	#define SIGSEGV_FAULT_ADDRESS                   addr
405	>
406	>	// Use decoding scheme from BasiliskII/m68k native
407	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
408	>	{
409	>	struct sigstate {
410	>	int ss_flags;
411	>	struct frame ss_frame;
412	>	};
413	>	struct sigstate *state = (struct sigstate *)scp->sc_ap;
414	>	char *fault_addr;
415	>	switch (state->ss_frame.f_format) {
416	>	case 7:         /* 68040 access error */
417	>	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
418	>	fault_addr = state->ss_frame.f_fmt7.f_fa;
419	>	break;
420	>	default:
421	>	fault_addr = (char *)code;
422	>	break;
423	>	}
424	>	return (sigsegv_address_t)fault_addr;
425	>	}
426	>	#endif
427	>	#if (defined(alpha) || defined(__alpha__))
428	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
429	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
430	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
431		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
432		#endif
433	+	#if (defined(i386) || defined(__i386__))
434	+	#error "FIXME: need to decode instruction and compute EA"
435	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
436	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
437	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
438	+	#endif
439	+	#endif
440	+	#if defined(__FreeBSD__)
441	+	#if (defined(i386) || defined(__i386__))
442	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
443	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
444	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
445	+	#define SIGSEGV_FAULT_ADDRESS                   addr
446	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
447	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
448	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
449	+	#endif
450	+	#if (defined(alpha) || defined(__alpha__))
451	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
452	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, char *addr, struct sigcontext *scp
453	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, addr, scp
454	+	#define SIGSEGV_FAULT_ADDRESS                   addr
455	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
456	+	#endif
457		#endif
458
459	<	// MacOS X
459	>	// Extract fault address out of a sigcontext
460	>	#if (defined(alpha) || defined(__alpha__))
461	>	// From Boehm's GC 6.0alpha8
462	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
463	>	{
464	>	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
465	>	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
466	>	fault_address += (signed long)(signed short)(instruction & 0xffff);
467	>	return (sigsegv_address_t)fault_address;
468	>	}
469	>	#endif
470	>
471	>
472	>	// MacOS X, not sure which version this works in. Under 10.1
473	>	// vm_protect does not appear to work from a signal handler. Under
474	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
475	>	// field is the address of the faulting instruction and not the
476	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
477	>	// case with Mach exception handlers there is a way to do what this
478	>	// was meant to do.
479	>	#ifndef HAVE_MACH_EXCEPTIONS
480		#if defined(__APPLE__) && defined(__MACH__)
481		#if (defined(ppc) || defined(__ppc__))
482		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
483	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
484		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
485		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
486		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
487	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
488	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
489
490	<	// From Boehm's GC 6.0alpha8
165	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
166	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
167	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
168	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
169	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
170	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
171	<
490	>	// Use decoding scheme from SheepShaver
491		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
492		{
493	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
494	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
495	<	int            disp = 0, tmp;
496	<	unsigned int   baseA = 0, baseB = 0;
497	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
498	<
499	<	switch(EXTRACT_OP1(instr)) {
500	<	case 38:   /* stb */
501	<	case 39:   /* stbu */
502	<	case 54:   /* stfd */
503	<	case 55:   /* stfdu */
504	<	case 52:   /* stfs */
505	<	case 53:   /* stfsu */
506	<	case 44:   /* sth */
507	<	case 45:   /* sthu */
508	<	case 47:   /* stmw */
509	<	case 36:   /* stw */
510	<	case 37:   /* stwu */
511	<	tmp = EXTRACT_REGA(instr);
512	<	if(tmp > 0)
513	<	baseA = regs[tmp];
514	<	disp = EXTRACT_DISP(instr);
493	>	unsigned int   nip = (unsigned int) scp->sc_ir;
494	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
495	>	instruction_t  instr;
496	>
497	>	powerpc_decode_instruction(&instr, nip, gpr);
498	>	return (sigsegv_address_t)instr.addr;
499	>	}
500	>	#endif
501	>	#endif
502	>	#endif
503	>	#endif
504	>
505	>	#if HAVE_WIN32_EXCEPTIONS
506	>	#define WIN32_LEAN_AND_MEAN /* avoid including junk */
507	>	#include <windows.h>
508	>	#include <winerror.h>
509	>
510	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   EXCEPTION_POINTERS *ExceptionInfo
511	>	#define SIGSEGV_FAULT_HANDLER_ARGS              ExceptionInfo
512	>	#define SIGSEGV_FAULT_ADDRESS                   ExceptionInfo->ExceptionRecord->ExceptionInformation[1]
513	>	#define SIGSEGV_CONTEXT_REGS                    ExceptionInfo->ContextRecord
514	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS->Eip
515	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&SIGSEGV_CONTEXT_REGS->Edi)
516	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
517	>	#endif
518	>
519	>	#if HAVE_MACH_EXCEPTIONS
520	>
521	>	// This can easily be extended to other Mach systems, but really who
522	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
523	>	// Mach 2.5/3.0?
524	>	#if defined(__APPLE__) && defined(__MACH__)
525	>
526	>	#include <sys/types.h>
527	>	#include <stdlib.h>
528	>	#include <stdio.h>
529	>	#include <pthread.h>
530	>
531	>	/*
532	>	* If you are familiar with MIG then you will understand the frustration
533	>	* that was necessary to get these embedded into C++ code by hand.
534	>	*/
535	>	extern "C" {
536	>	#include <mach/mach.h>
537	>	#include <mach/mach_error.h>
538	>
539	>	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
540	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
541	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
542	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
543	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
544	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
545	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
546	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
547	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
548	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
549	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
550	>	}
551	>
552	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
553	>	#define HANDLER_COUNT 64
554	>
555	>	// structure to tuck away existing exception handlers
556	>	typedef struct _ExceptionPorts {
557	>	mach_msg_type_number_t maskCount;
558	>	exception_mask_t masks[HANDLER_COUNT];
559	>	exception_handler_t handlers[HANDLER_COUNT];
560	>	exception_behavior_t behaviors[HANDLER_COUNT];
561	>	thread_state_flavor_t flavors[HANDLER_COUNT];
562	>	} ExceptionPorts;
563	>
564	>	// exception handler thread
565	>	static pthread_t exc_thread;
566	>
567	>	// place where old exception handler info is stored
568	>	static ExceptionPorts ports;
569	>
570	>	// our exception port
571	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
572	>
573	>	#define MACH_CHECK_ERROR(name,ret) \
574	>	if (ret != KERN_SUCCESS) { \
575	>	mach_error(#name, ret); \
576	>	exit (1); \
577	>	}
578	>
579	>	#define SIGSEGV_FAULT_ADDRESS                   code[1]
580	>	#define SIGSEGV_FAULT_INSTRUCTION               get_fault_instruction(thread, state)
581	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
582	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
583	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
584	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
585	>	#define SIGSEGV_REGISTER_FILE                   &state->srr0, &state->r0
586	>
587	>	// Given a suspended thread, stuff the current instruction and
588	>	// registers into state.
589	>	//
590	>	// It would have been nice to have this be ppc/x86 independant which
591	>	// could have been done easily with a thread_state_t instead of
592	>	// ppc_thread_state_t, but because of the way this is called it is
593	>	// easier to do it this way.
594	>	#if (defined(ppc) || defined(__ppc__))
595	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
596	>	{
597	>	kern_return_t krc;
598	>	mach_msg_type_number_t count;
599	>
600	>	count = MACHINE_THREAD_STATE_COUNT;
601	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
602	>	MACH_CHECK_ERROR (thread_get_state, krc);
603	>
604	>	return (sigsegv_address_t)state->srr0;
605	>	}
606	>	#endif
607	>
608	>	// Since there can only be one exception thread running at any time
609	>	// this is not a problem.
610	>	#define MSG_SIZE 512
611	>	static char msgbuf[MSG_SIZE];
612	>	static char replybuf[MSG_SIZE];
613	>
614	>	/*
615	>	* This is the entry point for the exception handler thread. The job
616	>	* of this thread is to wait for exception messages on the exception
617	>	* port that was setup beforehand and to pass them on to exc_server.
618	>	* exc_server is a MIG generated function that is a part of Mach.
619	>	* Its job is to decide what to do with the exception message. In our
620	>	* case exc_server calls catch_exception_raise on our behalf. After
621	>	* exc_server returns, it is our responsibility to send the reply.
622	>	*/
623	>	static void *
624	>	handleExceptions(void *priv)
625	>	{
626	>	mach_msg_header_t *msg, *reply;
627	>	kern_return_t krc;
628	>
629	>	msg = (mach_msg_header_t *)msgbuf;
630	>	reply = (mach_msg_header_t *)replybuf;
631	>
632	>	for (;;) {
633	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
634	>	_exceptionPort, 0, MACH_PORT_NULL);
635	>	MACH_CHECK_ERROR(mach_msg, krc);
636	>
637	>	if (!exc_server(msg, reply)) {
638	>	fprintf(stderr, "exc_server hated the message\n");
639	>	exit(1);
640	>	}
641	>
642	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
643	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
644	>	if (krc != KERN_SUCCESS) {
645	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
646	>	krc, mach_error_string(krc));
647	>	exit(1);
648	>	}
649	>	}
650	>	}
651	>	#endif
652	>	#endif
653	>
654	>
655	>	/*
656	>	*  Instruction skipping
657	>	*/
658	>
659	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
660	>	// Decode and skip X86 instruction
661	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
662	>	#if defined(__linux__)
663	>	enum {
664	>	#if (defined(i386) || defined(__i386__))
665	>	X86_REG_EIP = 14,
666	>	X86_REG_EAX = 11,
667	>	X86_REG_ECX = 10,
668	>	X86_REG_EDX = 9,
669	>	X86_REG_EBX = 8,
670	>	X86_REG_ESP = 7,
671	>	X86_REG_EBP = 6,
672	>	X86_REG_ESI = 5,
673	>	X86_REG_EDI = 4
674	>	#endif
675	>	#if defined(__x86_64__)
676	>	X86_REG_R8  = 0,
677	>	X86_REG_R9  = 1,
678	>	X86_REG_R10 = 2,
679	>	X86_REG_R11 = 3,
680	>	X86_REG_R12 = 4,
681	>	X86_REG_R13 = 5,
682	>	X86_REG_R14 = 6,
683	>	X86_REG_R15 = 7,
684	>	X86_REG_EDI = 8,
685	>	X86_REG_ESI = 9,
686	>	X86_REG_EBP = 10,
687	>	X86_REG_EBX = 11,
688	>	X86_REG_EDX = 12,
689	>	X86_REG_EAX = 13,
690	>	X86_REG_ECX = 14,
691	>	X86_REG_ESP = 15,
692	>	X86_REG_EIP = 16
693	>	#endif
694	>	};
695	>	#endif
696	>	#if defined(__NetBSD__)
697	>	enum {
698	>	#if (defined(i386) || defined(__i386__))
699	>	X86_REG_EIP = _REG_EIP,
700	>	X86_REG_EAX = _REG_EAX,
701	>	X86_REG_ECX = _REG_ECX,
702	>	X86_REG_EDX = _REG_EDX,
703	>	X86_REG_EBX = _REG_EBX,
704	>	X86_REG_ESP = _REG_ESP,
705	>	X86_REG_EBP = _REG_EBP,
706	>	X86_REG_ESI = _REG_ESI,
707	>	X86_REG_EDI = _REG_EDI
708	>	#endif
709	>	};
710	>	#endif
711	>	#if defined(__FreeBSD__)
712	>	enum {
713	>	#if (defined(i386) || defined(__i386__))
714	>	X86_REG_EIP = 10,
715	>	X86_REG_EAX = 7,
716	>	X86_REG_ECX = 6,
717	>	X86_REG_EDX = 5,
718	>	X86_REG_EBX = 4,
719	>	X86_REG_ESP = 13,
720	>	X86_REG_EBP = 2,
721	>	X86_REG_ESI = 1,
722	>	X86_REG_EDI = 0
723	>	#endif
724	>	};
725	>	#endif
726	>	#if defined(_WIN32)
727	>	enum {
728	>	#if (defined(i386) || defined(__i386__))
729	>	X86_REG_EIP = 7,
730	>	X86_REG_EAX = 5,
731	>	X86_REG_ECX = 4,
732	>	X86_REG_EDX = 3,
733	>	X86_REG_EBX = 2,
734	>	X86_REG_ESP = 10,
735	>	X86_REG_EBP = 6,
736	>	X86_REG_ESI = 1,
737	>	X86_REG_EDI = 0
738	>	#endif
739	>	};
740	>	#endif
741	>	// FIXME: this is partly redundant with the instruction decoding phase
742	>	// to discover transfer type and register number
743	>	static inline int ix86_step_over_modrm(unsigned char * p)
744	>	{
745	>	int mod = (p[0] >> 6) & 3;
746	>	int rm = p[0] & 7;
747	>	int offset = 0;
748	>
749	>	// ModR/M Byte
750	>	switch (mod) {
751	>	case 0: // [reg]
752	>	if (rm == 5) return 4; // disp32
753		break;
754	<	case 31:
755	<	switch(EXTRACT_OP2(instr)) {
756	<	case 86:    /* dcbf */
757	<	case 54:    /* dcbst */
758	<	case 1014:  /* dcbz */
759	<	case 247:   /* stbux */
760	<	case 215:   /* stbx */
761	<	case 759:   /* stfdux */
762	<	case 727:   /* stfdx */
763	<	case 983:   /* stfiwx */
764	<	case 695:   /* stfsux */
765	<	case 663:   /* stfsx */
766	<	case 918:   /* sthbrx */
767	<	case 439:   /* sthux */
768	<	case 407:   /* sthx */
769	<	case 661:   /* stswx */
770	<	case 662:   /* stwbrx */
771	<	case 150:   /* stwcx. */
772	<	case 183:   /* stwux */
773	<	case 151:   /* stwx */
774	<	case 135:   /* stvebx */
775	<	case 167:   /* stvehx */
776	<	case 199:   /* stvewx */
777	<	case 231:   /* stvx */
778	<	case 487:   /* stvxl */
779	<	tmp = EXTRACT_REGA(instr);
780	<	if(tmp > 0)
781	<	baseA = regs[tmp];
782	<	baseB = regs[EXTRACT_REGC(instr)];
783	<	/* determine Altivec alignment mask */
784	<	switch(EXTRACT_OP2(instr)) {
785	<	case 167:   /* stvehx */
786	<	alignmask = 0xFFFFFFFE;
787	<	break;
788	<	case 199:   /* stvewx */
789	<	alignmask = 0xFFFFFFFC;
754	>	case 1: // disp8[reg]
755	>	offset = 1;
756	>	break;
757	>	case 2: // disp32[reg]
758	>	offset = 4;
759	>	break;
760	>	case 3: // register
761	>	return 0;
762	>	}
763	>
764	>	// SIB Byte
765	>	if (rm == 4) {
766	>	if (mod == 0 && (p[1] & 7) == 5)
767	>	offset = 5; // disp32[index]
768	>	else
769	>	offset++;
770	>	}
771	>
772	>	return offset;
773	>	}
774	>
775	>	static bool ix86_skip_instruction(unsigned long * regs)
776	>	{
777	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
778	>
779	>	if (eip == 0)
780	>	return false;
781	>	#ifdef _WIN32
782	>	if (IsBadCodePtr((FARPROC)eip))
783	>	return false;
784	>	#endif
785	>
786	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
787	>	transfer_size_t transfer_size = SIZE_LONG;
788	>
789	>	int reg = -1;
790	>	int len = 0;
791	>
792	>	#if DEBUG
793	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
794	>	eip, eip[0], eip[1], eip[2], eip[3]);
795	>	#endif
796	>
797	>	// Operand size prefix
798	>	if (*eip == 0x66) {
799	>	eip++;
800	>	len++;
801	>	transfer_size = SIZE_WORD;
802	>	}
803	>
804	>	// REX prefix
805	>	#if defined(__x86_64__)
806	>	struct rex_t {
807	>	unsigned char W;
808	>	unsigned char R;
809	>	unsigned char X;
810	>	unsigned char B;
811	>	};
812	>	rex_t rex = { 0, 0, 0, 0 };
813	>	bool has_rex = false;
814	>	if ((*eip & 0xf0) == 0x40) {
815	>	has_rex = true;
816	>	const unsigned char b = *eip;
817	>	rex.W = b & (1 << 3);
818	>	rex.R = b & (1 << 2);
819	>	rex.X = b & (1 << 1);
820	>	rex.B = b & (1 << 0);
821	>	#if DEBUG
822	>	printf("REX: %c,%c,%c,%c\n",
823	>	rex.W ? 'W' : '_',
824	>	rex.R ? 'R' : '_',
825	>	rex.X ? 'X' : '_',
826	>	rex.B ? 'B' : '_');
827	>	#endif
828	>	eip++;
829	>	len++;
830	>	if (rex.W)
831	>	transfer_size = SIZE_QUAD;
832	>	}
833	>	#else
834	>	const bool has_rex = false;
835	>	#endif
836	>
837	>	// Decode instruction
838	>	int target_size = SIZE_UNKNOWN;
839	>	switch (eip[0]) {
840	>	case 0x0f:
841	>	target_size = transfer_size;
842	>	switch (eip[1]) {
843	>	case 0xbe: // MOVSX r32, r/m8
844	>	case 0xb6: // MOVZX r32, r/m8
845	>	transfer_size = SIZE_BYTE;
846	>	goto do_mov_extend;
847	>	case 0xbf: // MOVSX r32, r/m16
848	>	case 0xb7: // MOVZX r32, r/m16
849	>	transfer_size = SIZE_WORD;
850	>	goto do_mov_extend;
851	>	do_mov_extend:
852	>	switch (eip[2] & 0xc0) {
853	>	case 0x80:
854	>	reg = (eip[2] >> 3) & 7;
855	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
856		break;
857	<	case 231:   /* stvx */
858	<	alignmask = 0xFFFFFFF0;
857	>	case 0x40:
858	>	reg = (eip[2] >> 3) & 7;
859	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
860		break;
861	<	case 487:  /* stvxl */
862	<	alignmask = 0xFFFFFFF0;
861	>	case 0x00:
862	>	reg = (eip[2] >> 3) & 7;
863	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
864		break;
865		}
866	+	len += 3 + ix86_step_over_modrm(eip + 2);
867	+	break;
868	+	}
869	+	break;
870	+	case 0x8a: // MOV r8, r/m8
871	+	transfer_size = SIZE_BYTE;
872	+	case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
873	+	switch (eip[1] & 0xc0) {
874	+	case 0x80:
875	+	reg = (eip[1] >> 3) & 7;
876	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
877		break;
878	<	case 725:   /* stswi */
879	<	tmp = EXTRACT_REGA(instr);
880	<	if(tmp > 0)
245	<	baseA = regs[tmp];
878	>	case 0x40:
879	>	reg = (eip[1] >> 3) & 7;
880	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
881		break;
882	<	default:   /* ignore instruction */
883	<	return 0;
882	>	case 0x00:
883	>	reg = (eip[1] >> 3) & 7;
884	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
885		break;
886		}
887	+	len += 2 + ix86_step_over_modrm(eip + 1);
888		break;
889	<	default:   /* ignore instruction */
890	<	return 0;
889	>	case 0x88: // MOV r/m8, r8
890	>	transfer_size = SIZE_BYTE;
891	>	case 0x89: // MOV r/m32, r32 (or 16-bit operation)
892	>	switch (eip[1] & 0xc0) {
893	>	case 0x80:
894	>	reg = (eip[1] >> 3) & 7;
895	>	transfer_type = SIGSEGV_TRANSFER_STORE;
896	>	break;
897	>	case 0x40:
898	>	reg = (eip[1] >> 3) & 7;
899	>	transfer_type = SIGSEGV_TRANSFER_STORE;
900	>	break;
901	>	case 0x00:
902	>	reg = (eip[1] >> 3) & 7;
903	>	transfer_type = SIGSEGV_TRANSFER_STORE;
904	>	break;
905	>	}
906	>	len += 2 + ix86_step_over_modrm(eip + 1);
907		break;
908		}
909	+	if (target_size == SIZE_UNKNOWN)
910	+	target_size = transfer_size;
911	+
912	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
913	+	// Unknown machine code, let it crash. Then patch the decoder
914	+	return false;
915	+	}
916	+
917	+	#if defined(__x86_64__)
918	+	if (rex.R)
919	+	reg += 8;
920	+	#endif
921	+
922	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
923	+	static const int x86_reg_map[] = {
924	+	X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
925	+	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
926	+	#if defined(__x86_64__)
927	+	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
928	+	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
929	+	#endif
930	+	};
931	+
932	+	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
933	+	return false;
934	+
935	+	// Set 0 to the relevant register part
936	+	// NOTE: this is only valid for MOV alike instructions
937	+	int rloc = x86_reg_map[reg];
938	+	switch (target_size) {
939	+	case SIZE_BYTE:
940	+	if (has_rex || reg < 4)
941	+	regs[rloc] = (regs[rloc] & ~0x00ffL);
942	+	else {
943	+	rloc = x86_reg_map[reg - 4];
944	+	regs[rloc] = (regs[rloc] & ~0xff00L);
945	+	}
946	+	break;
947	+	case SIZE_WORD:
948	+	regs[rloc] = (regs[rloc] & ~0xffffL);
949	+	break;
950	+	case SIZE_LONG:
951	+	case SIZE_QUAD: // zero-extension
952	+	regs[rloc] = 0;
953	+	break;
954	+	}
955	+	}
956	+
957	+	#if DEBUG
958	+	printf("%08x: %s %s access", regs[X86_REG_EIP],
959	+	transfer_size == SIZE_BYTE ? "byte" :
960	+	transfer_size == SIZE_WORD ? "word" :
961	+	transfer_size == SIZE_LONG ? "long" :
962	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
963	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
964	+
965	+	if (reg != -1) {
966	+	static const char * x86_byte_reg_str_map[] = {
967	+	"al",   "cl",   "dl",   "bl",
968	+	"spl",  "bpl",  "sil",  "dil",
969	+	"r8b",  "r9b",  "r10b", "r11b",
970	+	"r12b", "r13b", "r14b", "r15b",
971	+	"ah",   "ch",   "dh",   "bh",
972	+	};
973	+	static const char * x86_word_reg_str_map[] = {
974	+	"ax",   "cx",   "dx",   "bx",
975	+	"sp",   "bp",   "si",   "di",
976	+	"r8w",  "r9w",  "r10w", "r11w",
977	+	"r12w", "r13w", "r14w", "r15w",
978	+	};
979	+	static const char *x86_long_reg_str_map[] = {
980	+	"eax",  "ecx",  "edx",  "ebx",
981	+	"esp",  "ebp",  "esi",  "edi",
982	+	"r8d",  "r9d",  "r10d", "r11d",
983	+	"r12d", "r13d", "r14d", "r15d",
984	+	};
985	+	static const char *x86_quad_reg_str_map[] = {
986	+	"rax", "rcx", "rdx", "rbx",
987	+	"rsp", "rbp", "rsi", "rdi",
988	+	"r8",  "r9",  "r10", "r11",
989	+	"r12", "r13", "r14", "r15",
990	+	};
991	+	const char * reg_str = NULL;
992	+	switch (target_size) {
993	+	case SIZE_BYTE:
994	+	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
995	+	break;
996	+	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
997	+	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
998	+	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
999	+	}
1000	+	if (reg_str)
1001	+	printf(" %s register %%%s",
1002	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
1003	+	reg_str);
1004	+	}
1005	+	printf(", %d bytes instruction\n", len);
1006	+	#endif
1007	+
1008	+	regs[X86_REG_EIP] += len;
1009	+	return true;
1010	+	}
1011	+	#endif
1012	+
1013	+	// Decode and skip PPC instruction
1014	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
1015	+	static bool powerpc_skip_instruction(unsigned long * nip_p, unsigned long * regs)
1016	+	{
1017	+	instruction_t instr;
1018	+	powerpc_decode_instruction(&instr, *nip_p, regs);
1019	+
1020	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1021	+	// Unknown machine code, let it crash. Then patch the decoder
1022	+	return false;
1023	+	}
1024	+
1025	+	#if DEBUG
1026	+	printf("%08x: %s %s access", *nip_p,
1027	+	instr.transfer_size == SIZE_BYTE ? "byte" :
1028	+	instr.transfer_size == SIZE_WORD ? "word" :
1029	+	instr.transfer_size == SIZE_LONG ? "long" : "quad",
1030	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1031	+
1032	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1033	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
1034	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1035	+	printf(" r%d (rd = 0)\n", instr.rd);
1036	+	#endif
1037	+
1038	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1039	+	regs[instr.ra] = instr.addr;
1040	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1041	+	regs[instr.rd] = 0;
1042
1043	<	addr = (baseA + baseB) + disp;
1044	<	addr &= alignmask;
1045	<	return (sigsegv_address_t)addr;
1043	>	*nip_p += 4;
1044	>	return true;
1045	>	}
1046	>	#endif
1047	>
1048	>	// Decode and skip MIPS instruction
1049	>	#if (defined(mips) || defined(__mips))
1050	>	enum {
1051	>	#if (defined(sgi) || defined(__sgi))
1052	>	MIPS_REG_EPC = 35,
1053	>	#endif
1054	>	};
1055	>	static bool mips_skip_instruction(greg_t * regs)
1056	>	{
1057	>	unsigned int * epc = (unsigned int *)(unsigned long)regs[MIPS_REG_EPC];
1058	>
1059	>	if (epc == 0)
1060	>	return false;
1061	>
1062	>	#if DEBUG
1063	>	printf("IP: %p [%08x]\n", epc, epc[0]);
1064	>	#endif
1065	>
1066	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1067	>	transfer_size_t transfer_size = SIZE_LONG;
1068	>	int direction = 0;
1069	>
1070	>	const unsigned int opcode = epc[0];
1071	>	switch (opcode >> 26) {
1072	>	case 32: // Load Byte
1073	>	case 36: // Load Byte Unsigned
1074	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1075	>	transfer_size = SIZE_BYTE;
1076	>	break;
1077	>	case 33: // Load Halfword
1078	>	case 37: // Load Halfword Unsigned
1079	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1080	>	transfer_size = SIZE_WORD;
1081	>	break;
1082	>	case 35: // Load Word
1083	>	case 39: // Load Word Unsigned
1084	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1085	>	transfer_size = SIZE_LONG;
1086	>	break;
1087	>	case 34: // Load Word Left
1088	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1089	>	transfer_size = SIZE_LONG;
1090	>	direction = -1;
1091	>	break;
1092	>	case 38: // Load Word Right
1093	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1094	>	transfer_size = SIZE_LONG;
1095	>	direction = 1;
1096	>	break;
1097	>	case 55: // Load Doubleword
1098	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1099	>	transfer_size = SIZE_QUAD;
1100	>	break;
1101	>	case 26: // Load Doubleword Left
1102	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1103	>	transfer_size = SIZE_QUAD;
1104	>	direction = -1;
1105	>	break;
1106	>	case 27: // Load Doubleword Right
1107	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1108	>	transfer_size = SIZE_QUAD;
1109	>	direction = 1;
1110	>	break;
1111	>	case 40: // Store Byte
1112	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1113	>	transfer_size = SIZE_BYTE;
1114	>	break;
1115	>	case 41: // Store Halfword
1116	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1117	>	transfer_size = SIZE_WORD;
1118	>	break;
1119	>	case 43: // Store Word
1120	>	case 42: // Store Word Left
1121	>	case 46: // Store Word Right
1122	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1123	>	transfer_size = SIZE_LONG;
1124	>	break;
1125	>	case 63: // Store Doubleword
1126	>	case 44: // Store Doubleword Left
1127	>	case 45: // Store Doubleword Right
1128	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1129	>	transfer_size = SIZE_QUAD;
1130	>	break;
1131	>	/* Misc instructions unlikely to be used within CPU emulators */
1132	>	case 48: // Load Linked Word
1133	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1134	>	transfer_size = SIZE_LONG;
1135	>	break;
1136	>	case 52: // Load Linked Doubleword
1137	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1138	>	transfer_size = SIZE_QUAD;
1139	>	break;
1140	>	case 56: // Store Conditional Word
1141	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1142	>	transfer_size = SIZE_LONG;
1143	>	break;
1144	>	case 60: // Store Conditional Doubleword
1145	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1146	>	transfer_size = SIZE_QUAD;
1147	>	break;
1148	>	}
1149	>
1150	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1151	>	// Unknown machine code, let it crash. Then patch the decoder
1152	>	return false;
1153	>	}
1154	>
1155	>	// Zero target register in case of a load operation
1156	>	const int reg = (opcode >> 16) & 0x1f;
1157	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
1158	>	if (direction == 0)
1159	>	regs[reg] = 0;
1160	>	else {
1161	>	// FIXME: untested code
1162	>	unsigned long ea = regs[(opcode >> 21) & 0x1f];
1163	>	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
1164	>	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
1165	>	unsigned long value;
1166	>	if (direction > 0) {
1167	>	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
1168	>	value = regs[reg] & rmask;
1169	>	}
1170	>	else {
1171	>	const unsigned long lmask = (1L << (offset * 8)) - 1;
1172	>	value = regs[reg] & lmask;
1173	>	}
1174	>	// restore most significant bits
1175	>	if (transfer_size == SIZE_LONG)
1176	>	value = (signed long)(signed int)value;
1177	>	regs[reg] = value;
1178	>	}
1179	>	}
1180	>
1181	>	#if DEBUG
1182	>	#if (defined(_ABIN32) || defined(_ABI64))
1183	>	static const char * mips_gpr_names[32] = {
1184	>	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1185	>	"t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
1186	>	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1187	>	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1188	>	};
1189	>	#else
1190	>	static const char * mips_gpr_names[32] = {
1191	>	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1192	>	"a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
1193	>	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1194	>	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1195	>	};
1196	>	#endif
1197	>	printf("%s %s register %s\n",
1198	>	transfer_size == SIZE_BYTE ? "byte" :
1199	>	transfer_size == SIZE_WORD ? "word" :
1200	>	transfer_size == SIZE_LONG ? "long" :
1201	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1202	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1203	>	mips_gpr_names[reg]);
1204	>	#endif
1205	>
1206	>	regs[MIPS_REG_EPC] += 4;
1207	>	return true;
1208	>	}
1209	>	#endif
1210	>
1211	>	// Decode and skip SPARC instruction
1212	>	#if (defined(sparc) || defined(__sparc__))
1213	>	enum {
1214	>	#if (defined(__sun__))
1215	>	SPARC_REG_G1 = REG_G1,
1216	>	SPARC_REG_O0 = REG_O0,
1217	>	SPARC_REG_PC = REG_PC,
1218	>	#endif
1219	>	};
1220	>	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
1221	>	{
1222	>	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
1223	>
1224	>	if (pc == 0)
1225	>	return false;
1226	>
1227	>	#if DEBUG
1228	>	printf("IP: %p [%08x]\n", pc, pc[0]);
1229	>	#endif
1230	>
1231	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1232	>	transfer_size_t transfer_size = SIZE_LONG;
1233	>	bool register_pair = false;
1234	>
1235	>	const unsigned int opcode = pc[0];
1236	>	if ((opcode >> 30) != 3)
1237	>	return false;
1238	>	switch ((opcode >> 19) & 0x3f) {
1239	>	case 9: // Load Signed Byte
1240	>	case 1: // Load Unsigned Byte
1241	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1242	>	transfer_size = SIZE_BYTE;
1243	>	break;
1244	>	case 10:// Load Signed Halfword
1245	>	case 2: // Load Unsigned Word
1246	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1247	>	transfer_size = SIZE_WORD;
1248	>	break;
1249	>	case 8: // Load Word
1250	>	case 0: // Load Unsigned Word
1251	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1252	>	transfer_size = SIZE_LONG;
1253	>	break;
1254	>	case 11:// Load Extended Word
1255	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1256	>	transfer_size = SIZE_QUAD;
1257	>	break;
1258	>	case 3: // Load Doubleword
1259	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
1260	>	transfer_size = SIZE_LONG;
1261	>	register_pair = true;
1262	>	break;
1263	>	case 5: // Store Byte
1264	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1265	>	transfer_size = SIZE_BYTE;
1266	>	break;
1267	>	case 6: // Store Halfword
1268	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1269	>	transfer_size = SIZE_WORD;
1270	>	break;
1271	>	case 4: // Store Word
1272	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1273	>	transfer_size = SIZE_LONG;
1274	>	break;
1275	>	case 14:// Store Extended Word
1276	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1277	>	transfer_size = SIZE_QUAD;
1278	>	break;
1279	>	case 7: // Store Doubleword
1280	>	transfer_type = SIGSEGV_TRANSFER_STORE;
1281	>	transfer_size = SIZE_WORD;
1282	>	register_pair = true;
1283	>	break;
1284	>	}
1285	>
1286	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1287	>	// Unknown machine code, let it crash. Then patch the decoder
1288	>	return false;
1289	>	}
1290	>
1291	>	// Zero target register in case of a load operation
1292	>	const int reg = (opcode >> 25) & 0x1f;
1293	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
1294	>	// FIXME: code to handle local & input registers is not tested
1295	>	if (reg >= 1 && reg <= 7) {
1296	>	// global registers
1297	>	regs[reg - 1 + SPARC_REG_G1] = 0;
1298	>	}
1299	>	else if (reg >= 8 && reg <= 15) {
1300	>	// output registers
1301	>	regs[reg - 8 + SPARC_REG_O0] = 0;
1302	>	}
1303	>	else if (reg >= 16 && reg <= 23) {
1304	>	// local registers (in register windows)
1305	>	if (gwins)
1306	>	gwins->wbuf->rw_local[reg - 16] = 0;
1307	>	else
1308	>	rwin->rw_local[reg - 16] = 0;
1309	>	}
1310	>	else {
1311	>	// input registers (in register windows)
1312	>	if (gwins)
1313	>	gwins->wbuf->rw_in[reg - 24] = 0;
1314	>	else
1315	>	rwin->rw_in[reg - 24] = 0;
1316	>	}
1317	>	}
1318	>
1319	>	#if DEBUG
1320	>	static const char * reg_names[] = {
1321	>	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
1322	>	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
1323	>	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
1324	>	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
1325	>	};
1326	>	printf("%s %s register %s\n",
1327	>	transfer_size == SIZE_BYTE ? "byte" :
1328	>	transfer_size == SIZE_WORD ? "word" :
1329	>	transfer_size == SIZE_LONG ? "long" :
1330	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1331	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1332	>	reg_names[reg]);
1333	>	#endif
1334	>
1335	>	regs[SPARC_REG_PC] += 4;
1336	>	return true;
1337		}
1338		#endif
1339		#endif
1340	+
1341	+	// Decode and skip ARM instruction
1342	+	#if (defined(arm) || defined(__arm__))
1343	+	enum {
1344	+	#if (defined(__linux__))
1345	+	ARM_REG_PC = 15,
1346	+	ARM_REG_CPSR = 16
1347	+	#endif
1348	+	};
1349	+	static bool arm_skip_instruction(unsigned long * regs)
1350	+	{
1351	+	unsigned int * pc = (unsigned int *)regs[ARM_REG_PC];
1352	+
1353	+	if (pc == 0)
1354	+	return false;
1355	+
1356	+	#if DEBUG
1357	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1358	+	#endif
1359	+
1360	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1361	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
1362	+	enum { op_sdt = 1, op_sdth = 2 };
1363	+	int op = 0;
1364	+
1365	+	// Handle load/store instructions only
1366	+	const unsigned int opcode = pc[0];
1367	+	switch ((opcode >> 25) & 7) {
1368	+	case 0: // Halfword and Signed Data Transfer (LDRH, STRH, LDRSB, LDRSH)
1369	+	op = op_sdth;
1370	+	// Determine transfer size (S/H bits)
1371	+	switch ((opcode >> 5) & 3) {
1372	+	case 0: // SWP instruction
1373	+	break;
1374	+	case 1: // Unsigned halfwords
1375	+	case 3: // Signed halfwords
1376	+	transfer_size = SIZE_WORD;
1377	+	break;
1378	+	case 2: // Signed byte
1379	+	transfer_size = SIZE_BYTE;
1380	+	break;
1381	+	}
1382	+	break;
1383	+	case 2:
1384	+	case 3: // Single Data Transfer (LDR, STR)
1385	+	op = op_sdt;
1386	+	// Determine transfer size (B bit)
1387	+	if (((opcode >> 22) & 1) == 1)
1388	+	transfer_size = SIZE_BYTE;
1389	+	else
1390	+	transfer_size = SIZE_LONG;
1391	+	break;
1392	+	default:
1393	+	// FIXME: support load/store mutliple?
1394	+	return false;
1395	+	}
1396	+
1397	+	// Check for invalid transfer size (SWP instruction?)
1398	+	if (transfer_size == SIZE_UNKNOWN)
1399	+	return false;
1400	+
1401	+	// Determine transfer type (L bit)
1402	+	if (((opcode >> 20) & 1) == 1)
1403	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1404	+	else
1405	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1406	+
1407	+	// Compute offset
1408	+	int offset;
1409	+	if (((opcode >> 25) & 1) == 0) {
1410	+	if (op == op_sdt)
1411	+	offset = opcode & 0xfff;
1412	+	else if (op == op_sdth) {
1413	+	int rm = opcode & 0xf;
1414	+	if (((opcode >> 22) & 1) == 0) {
1415	+	// register offset
1416	+	offset = regs[rm];
1417	+	}
1418	+	else {
1419	+	// immediate offset
1420	+	offset = ((opcode >> 4) & 0xf0) | (opcode & 0x0f);
1421	+	}
1422	+	}
1423	+	}
1424	+	else {
1425	+	const int rm = opcode & 0xf;
1426	+	const int sh = (opcode >> 7) & 0x1f;
1427	+	if (((opcode >> 4) & 1) == 1) {
1428	+	// we expect only legal load/store instructions
1429	+	printf("FATAL: invalid shift operand\n");
1430	+	return false;
1431	+	}
1432	+	const unsigned int v = regs[rm];
1433	+	switch ((opcode >> 5) & 3) {
1434	+	case 0: // logical shift left
1435	+	offset = sh ? v << sh : v;
1436	+	break;
1437	+	case 1: // logical shift right
1438	+	offset = sh ? v >> sh : 0;
1439	+	break;
1440	+	case 2: // arithmetic shift right
1441	+	if (sh)
1442	+	offset = ((signed int)v) >> sh;
1443	+	else
1444	+	offset = (v & 0x80000000) ? 0xffffffff : 0;
1445	+	break;
1446	+	case 3: // rotate right
1447	+	if (sh)
1448	+	offset = (v >> sh) | (v << (32 - sh));
1449	+	else
1450	+	offset = (v >> 1) | ((regs[ARM_REG_CPSR] << 2) & 0x80000000);
1451	+	break;
1452	+	}
1453	+	}
1454	+	if (((opcode >> 23) & 1) == 0)
1455	+	offset = -offset;
1456	+
1457	+	int rd = (opcode >> 12) & 0xf;
1458	+	int rn = (opcode >> 16) & 0xf;
1459	+	#if DEBUG
1460	+	static const char * reg_names[] = {
1461	+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1462	+	"r9", "r9", "sl", "fp", "ip", "sp", "lr", "pc"
1463	+	};
1464	+	printf("%s %s register %s\n",
1465	+	transfer_size == SIZE_BYTE ? "byte" :
1466	+	transfer_size == SIZE_WORD ? "word" :
1467	+	transfer_size == SIZE_LONG ? "long" : "unknown",
1468	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1469	+	reg_names[rd]);
1470	+	#endif
1471	+
1472	+	unsigned int base = regs[rn];
1473	+	if (((opcode >> 24) & 1) == 1)
1474	+	base += offset;
1475	+
1476	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD)
1477	+	regs[rd] = 0;
1478	+
1479	+	if (((opcode >> 24) & 1) == 0)                // post-index addressing
1480	+	regs[rn] += offset;
1481	+	else if (((opcode >> 21) & 1) == 1)   // write-back address into base
1482	+	regs[rn] = base;
1483	+
1484	+	regs[ARM_REG_PC] += 4;
1485	+	return true;
1486	+	}
1487		#endif
1488
1489	+
1490		// Fallbacks
1491		#ifndef SIGSEGV_FAULT_INSTRUCTION
1492		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
1493		#endif
1494	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
1495	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
1496	+	#endif
1497	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
1498	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
1499	+	#endif
1500
1501		// SIGSEGV recovery supported ?
1502		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 277 | Line 1508 | static sigsegv_address_t get_fault_addre
1508		*  SIGSEGV global handler
1509		*/
1510
1511	+	// This function handles the badaccess to memory.
1512	+	// It is called from the signal handler or the exception handler.
1513	+	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
1514	+	{
1515	+	sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
1516	+	sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
1517	+
1518	+	// Call user's handler and reinstall the global handler, if required
1519	+	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
1520	+	case SIGSEGV_RETURN_SUCCESS:
1521	+	return true;
1522	+
1523	+	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1524	+	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
1525	+	// Call the instruction skipper with the register file
1526	+	// available
1527	+	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
1528	+	#ifdef HAVE_MACH_EXCEPTIONS
1529	+	// Unlike UNIX signals where the thread state
1530	+	// is modified off of the stack, in Mach we
1531	+	// need to actually call thread_set_state to
1532	+	// have the register values updated.
1533	+	kern_return_t krc;
1534	+
1535	+	krc = thread_set_state(thread,
1536	+	MACHINE_THREAD_STATE, (thread_state_t)state,
1537	+	MACHINE_THREAD_STATE_COUNT);
1538	+	MACH_CHECK_ERROR (thread_get_state, krc);
1539	+	#endif
1540	+	return true;
1541	+	}
1542	+	break;
1543	+	#endif
1544	+	case SIGSEGV_RETURN_FAILURE:
1545	+	// We can't do anything with the fault_address, dump state?
1546	+	if (sigsegv_state_dumper != 0)
1547	+	sigsegv_state_dumper(fault_address, fault_instruction);
1548	+	break;
1549	+	}
1550	+
1551	+	return false;
1552	+	}
1553	+
1554	+
1555	+	/*
1556	+	* There are two mechanisms for handling a bad memory access,
1557	+	* Mach exceptions and UNIX signals. The implementation specific
1558	+	* code appears below. Its reponsibility is to call handle_badaccess
1559	+	* which is the routine that handles the fault in an implementation
1560	+	* agnostic manner. The implementation specific code below is then
1561	+	* reponsible for checking whether handle_badaccess was able
1562	+	* to handle the memory access error and perform any implementation
1563	+	* specific tasks necessary afterwards.
1564	+	*/
1565	+
1566	+	#ifdef HAVE_MACH_EXCEPTIONS
1567	+	/*
1568	+	* We need to forward all exceptions that we do not handle.
1569	+	* This is important, there are many exceptions that may be
1570	+	* handled by other exception handlers. For example debuggers
1571	+	* use exceptions and the exception hander is in another
1572	+	* process in such a case. (Timothy J. Wood states in his
1573	+	* message to the list that he based this code on that from
1574	+	* gdb for Darwin.)
1575	+	*/
1576	+	static inline kern_return_t
1577	+	forward_exception(mach_port_t thread_port,
1578	+	mach_port_t task_port,
1579	+	exception_type_t exception_type,
1580	+	exception_data_t exception_data,
1581	+	mach_msg_type_number_t data_count,
1582	+	ExceptionPorts *oldExceptionPorts)
1583	+	{
1584	+	kern_return_t kret;
1585	+	unsigned int portIndex;
1586	+	mach_port_t port;
1587	+	exception_behavior_t behavior;
1588	+	thread_state_flavor_t flavor;
1589	+	thread_state_t thread_state;
1590	+	mach_msg_type_number_t thread_state_count;
1591	+
1592	+	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1593	+	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1594	+	// This handler wants the exception
1595	+	break;
1596	+	}
1597	+	}
1598	+
1599	+	if (portIndex >= oldExceptionPorts->maskCount) {
1600	+	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1601	+	return KERN_FAILURE;
1602	+	}
1603	+
1604	+	port = oldExceptionPorts->handlers[portIndex];
1605	+	behavior = oldExceptionPorts->behaviors[portIndex];
1606	+	flavor = oldExceptionPorts->flavors[portIndex];
1607	+
1608	+	/*
1609	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1610	+	*/
1611	+
1612	+	if (behavior != EXCEPTION_DEFAULT) {
1613	+	thread_state_count = THREAD_STATE_MAX;
1614	+	kret = thread_get_state (thread_port, flavor, thread_state,
1615	+	&thread_state_count);
1616	+	MACH_CHECK_ERROR (thread_get_state, kret);
1617	+	}
1618	+
1619	+	switch (behavior) {
1620	+	case EXCEPTION_DEFAULT:
1621	+	// fprintf(stderr, "forwarding to exception_raise\n");
1622	+	kret = exception_raise(port, thread_port, task_port, exception_type,
1623	+	exception_data, data_count);
1624	+	MACH_CHECK_ERROR (exception_raise, kret);
1625	+	break;
1626	+	case EXCEPTION_STATE:
1627	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
1628	+	kret = exception_raise_state(port, exception_type, exception_data,
1629	+	data_count, &flavor,
1630	+	thread_state, thread_state_count,
1631	+	thread_state, &thread_state_count);
1632	+	MACH_CHECK_ERROR (exception_raise_state, kret);
1633	+	break;
1634	+	case EXCEPTION_STATE_IDENTITY:
1635	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1636	+	kret = exception_raise_state_identity(port, thread_port, task_port,
1637	+	exception_type, exception_data,
1638	+	data_count, &flavor,
1639	+	thread_state, thread_state_count,
1640	+	thread_state, &thread_state_count);
1641	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1642	+	break;
1643	+	default:
1644	+	fprintf(stderr, "forward_exception got unknown behavior\n");
1645	+	break;
1646	+	}
1647	+
1648	+	if (behavior != EXCEPTION_DEFAULT) {
1649	+	kret = thread_set_state (thread_port, flavor, thread_state,
1650	+	thread_state_count);
1651	+	MACH_CHECK_ERROR (thread_set_state, kret);
1652	+	}
1653	+
1654	+	return KERN_SUCCESS;
1655	+	}
1656	+
1657	+	/*
1658	+	* This is the code that actually handles the exception.
1659	+	* It is called by exc_server. For Darwin 5 Apple changed
1660	+	* this a bit from how this family of functions worked in
1661	+	* Mach. If you are familiar with that it is a little
1662	+	* different. The main variation that concerns us here is
1663	+	* that code is an array of exception specific codes and
1664	+	* codeCount is a count of the number of codes in the code
1665	+	* array. In typical Mach all exceptions have a code
1666	+	* and sub-code. It happens to be the case that for a
1667	+	* EXC_BAD_ACCESS exception the first entry is the type of
1668	+	* bad access that occurred and the second entry is the
1669	+	* faulting address so these entries correspond exactly to
1670	+	* how the code and sub-code are used on Mach.
1671	+	*
1672	+	* This is a MIG interface. No code in Basilisk II should
1673	+	* call this directley. This has to have external C
1674	+	* linkage because that is what exc_server expects.
1675	+	*/
1676	+	kern_return_t
1677	+	catch_exception_raise(mach_port_t exception_port,
1678	+	mach_port_t thread,
1679	+	mach_port_t task,
1680	+	exception_type_t exception,
1681	+	exception_data_t code,
1682	+	mach_msg_type_number_t codeCount)
1683	+	{
1684	+	ppc_thread_state_t state;
1685	+	kern_return_t krc;
1686	+
1687	+	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
1688	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1689	+	return KERN_SUCCESS;
1690	+	}
1691	+
1692	+	// In Mach we do not need to remove the exception handler.
1693	+	// If we forward the exception, eventually some exception handler
1694	+	// will take care of this exception.
1695	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1696	+
1697	+	return krc;
1698	+	}
1699	+	#endif
1700	+
1701		#ifdef HAVE_SIGSEGV_RECOVERY
1702	+	// Handle bad memory accesses with signal handler
1703		static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1704		{
1705	<	// Call user's handler and reinstall the global handler, if required
1706	<	if (sigsegv_user_handler((sigsegv_address_t)SIGSEGV_FAULT_ADDRESS, (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION)) {
1705	>	// Call handler and reinstall the global handler, if required
1706	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1707		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1708		sigsegv_do_install_handler(sig);
1709		#endif
1710	+	return;
1711		}
1712	<	else {
1713	<	// FAIL: reinstall default handler for "safe" crash
1712	>
1713	>	// Failure: reinstall default handler for "safe" crash
1714		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1715	<	SIGSEGV_ALL_SIGNALS
1715	>	SIGSEGV_ALL_SIGNALS
1716		#undef FAULT_HANDLER
294	–	}
1717		}
1718		#endif
1719
#	Line 305 | Line 1727 | static bool sigsegv_do_install_handler(i
1727		{
1728		// Setup SIGSEGV handler to process writes to frame buffer
1729		#ifdef HAVE_SIGACTION
1730	<	struct sigaction vosf_sa;
1731	<	sigemptyset(&vosf_sa.sa_mask);
1732	<	vosf_sa.sa_sigaction = sigsegv_handler;
1733	<	vosf_sa.sa_flags = SA_SIGINFO;
1734	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1730	>	struct sigaction sigsegv_sa;
1731	>	sigemptyset(&sigsegv_sa.sa_mask);
1732	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1733	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1734	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1735		#else
1736		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1737		#endif
#	Line 321 | Line 1743 | static bool sigsegv_do_install_handler(i
1743		{
1744		// Setup SIGSEGV handler to process writes to frame buffer
1745		#ifdef HAVE_SIGACTION
1746	<	struct sigaction vosf_sa;
1747	<	sigemptyset(&vosf_sa.sa_mask);
1748	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1746	>	struct sigaction sigsegv_sa;
1747	>	sigemptyset(&sigsegv_sa.sa_mask);
1748	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1749	>	sigsegv_sa.sa_flags = 0;
1750		#if !EMULATED_68K && defined(__NetBSD__)
1751	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1752	<	vosf_sa.sa_flags = SA_ONSTACK;
330	<	#else
331	<	vosf_sa.sa_flags = 0;
1751	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1752	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1753		#endif
1754	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1754	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1755		#else
1756		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1757		#endif
1758		}
1759		#endif
1760
1761	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
1761	>	#if defined(HAVE_MACH_EXCEPTIONS)
1762	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1763		{
1764	<	#ifdef HAVE_SIGSEGV_RECOVERY
1765	<	sigsegv_user_handler = handler;
1764	>	/*
1765	>	* Except for the exception port functions, this should be
1766	>	* pretty much stock Mach. If later you choose to support
1767	>	* other Mach's besides Darwin, just check for __MACH__
1768	>	* here and __APPLE__ where the actual differences are.
1769	>	*/
1770	>	#if defined(__APPLE__) && defined(__MACH__)
1771	>	if (sigsegv_fault_handler != NULL) {
1772	>	sigsegv_fault_handler = handler;
1773	>	return true;
1774	>	}
1775	>
1776	>	kern_return_t krc;
1777	>
1778	>	// create the the exception port
1779	>	krc = mach_port_allocate(mach_task_self(),
1780	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1781	>	if (krc != KERN_SUCCESS) {
1782	>	mach_error("mach_port_allocate", krc);
1783	>	return false;
1784	>	}
1785	>
1786	>	// add a port send right
1787	>	krc = mach_port_insert_right(mach_task_self(),
1788	>	_exceptionPort, _exceptionPort,
1789	>	MACH_MSG_TYPE_MAKE_SEND);
1790	>	if (krc != KERN_SUCCESS) {
1791	>	mach_error("mach_port_insert_right", krc);
1792	>	return false;
1793	>	}
1794	>
1795	>	// get the old exception ports
1796	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1797	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1798	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1799	>	if (krc != KERN_SUCCESS) {
1800	>	mach_error("thread_get_exception_ports", krc);
1801	>	return false;
1802	>	}
1803	>
1804	>	// set the new exception port
1805	>	//
1806	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1807	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1808	>	// message, but it turns out that in the common case this is not
1809	>	// neccessary. If we need it we can later ask for it from the
1810	>	// suspended thread.
1811	>	//
1812	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1813	>	// counter in the thread state.  The comments in the header file
1814	>	// seem to imply that you can count on the GPR's on an exception
1815	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1816	>	// you have to ask for all of the GPR's anyway just to get the
1817	>	// program counter. In any case because of update effective
1818	>	// address from immediate and update address from effective
1819	>	// addresses of ra and rb modes (as good an name as any for these
1820	>	// addressing modes) used in PPC instructions, you will need the
1821	>	// GPR state anyway.
1822	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1823	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1824	>	if (krc != KERN_SUCCESS) {
1825	>	mach_error("thread_set_exception_ports", krc);
1826	>	return false;
1827	>	}
1828	>
1829	>	// create the exception handler thread
1830	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1831	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1832	>	return false;
1833	>	}
1834	>
1835	>	// do not care about the exception thread any longer, let is run standalone
1836	>	(void)pthread_detach(exc_thread);
1837	>
1838	>	sigsegv_fault_handler = handler;
1839	>	return true;
1840	>	#else
1841	>	return false;
1842	>	#endif
1843	>	}
1844	>	#endif
1845	>
1846	>	#ifdef HAVE_WIN32_EXCEPTIONS
1847	>	static LONG WINAPI main_exception_filter(EXCEPTION_POINTERS *ExceptionInfo)
1848	>	{
1849	>	if (sigsegv_fault_handler != NULL
1850	>	&& ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
1851	>	&& ExceptionInfo->ExceptionRecord->NumberParameters == 2
1852	>	&& handle_badaccess(ExceptionInfo))
1853	>	return EXCEPTION_CONTINUE_EXECUTION;
1854	>
1855	>	return EXCEPTION_CONTINUE_SEARCH;
1856	>	}
1857	>
1858	>	#if defined __CYGWIN__ && defined __i386__
1859	>	/* In Cygwin programs, SetUnhandledExceptionFilter has no effect because Cygwin
1860	>	installs a global exception handler.  We have to dig deep in order to install
1861	>	our main_exception_filter.  */
1862	>
1863	>	/* Data structures for the current thread's exception handler chain.
1864	>	On the x86 Windows uses register fs, offset 0 to point to the current
1865	>	exception handler; Cygwin mucks with it, so we must do the same... :-/ */
1866	>
1867	>	/* Magic taken from winsup/cygwin/include/exceptions.h.  */
1868	>
1869	>	struct exception_list {
1870	>	struct exception_list *prev;
1871	>	int (*handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
1872	>	};
1873	>	typedef struct exception_list exception_list;
1874	>
1875	>	/* Magic taken from winsup/cygwin/exceptions.cc.  */
1876	>
1877	>	__asm__ (".equ __except_list,0");
1878	>
1879	>	extern exception_list *_except_list __asm__ ("%fs:__except_list");
1880	>
1881	>	/* For debugging.  _except_list is not otherwise accessible from gdb.  */
1882	>	static exception_list *
1883	>	debug_get_except_list ()
1884	>	{
1885	>	return _except_list;
1886	>	}
1887	>
1888	>	/* Cygwin's original exception handler.  */
1889	>	static int (*cygwin_exception_handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
1890	>
1891	>	/* Our exception handler.  */
1892	>	static int
1893	>	libsigsegv_exception_handler (EXCEPTION_RECORD *exception, void *frame, CONTEXT *context, void *dispatch)
1894	>	{
1895	>	EXCEPTION_POINTERS ExceptionInfo;
1896	>	ExceptionInfo.ExceptionRecord = exception;
1897	>	ExceptionInfo.ContextRecord = context;
1898	>	if (main_exception_filter (&ExceptionInfo) == EXCEPTION_CONTINUE_SEARCH)
1899	>	return cygwin_exception_handler (exception, frame, context, dispatch);
1900	>	else
1901	>	return 0;
1902	>	}
1903	>
1904	>	static void
1905	>	do_install_main_exception_filter ()
1906	>	{
1907	>	/* We cannot insert any handler into the chain, because such handlers
1908	>	must lie on the stack (?).  Instead, we have to replace(!) Cygwin's
1909	>	global exception handler.  */
1910	>	cygwin_exception_handler = _except_list->handler;
1911	>	_except_list->handler = libsigsegv_exception_handler;
1912	>	}
1913	>
1914	>	#else
1915	>
1916	>	static void
1917	>	do_install_main_exception_filter ()
1918	>	{
1919	>	SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) &main_exception_filter);
1920	>	}
1921	>	#endif
1922	>
1923	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1924	>	{
1925	>	static bool main_exception_filter_installed = false;
1926	>	if (!main_exception_filter_installed) {
1927	>	do_install_main_exception_filter();
1928	>	main_exception_filter_installed = true;
1929	>	}
1930	>	sigsegv_fault_handler = handler;
1931	>	return true;
1932	>	}
1933	>	#endif
1934	>
1935	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1936	>	{
1937	>	#if defined(HAVE_SIGSEGV_RECOVERY)
1938		bool success = true;
1939		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1940		SIGSEGV_ALL_SIGNALS
1941		#undef FAULT_HANDLER
1942	+	if (success)
1943	+	sigsegv_fault_handler = handler;
1944		return success;
1945	+	#elif defined(HAVE_MACH_EXCEPTIONS) || defined(HAVE_WIN32_EXCEPTIONS)
1946	+	return sigsegv_do_install_handler(handler);
1947		#else
1948		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1949		return false;
#	Line 359 | Line 1957 | bool sigsegv_install_handler(sigsegv_han
1957
1958		void sigsegv_deinstall_handler(void)
1959		{
1960	+	// We do nothing for Mach exceptions, the thread would need to be
1961	+	// suspended if not already so, and we might mess with other
1962	+	// exception handlers that came after we registered ours. There is
1963	+	// no need to remove the exception handler, in fact this function is
1964	+	// not called anywhere in Basilisk II.
1965		#ifdef HAVE_SIGSEGV_RECOVERY
1966	<	sigsegv_user_handler = 0;
1966	>	sigsegv_fault_handler = 0;
1967		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1968		SIGSEGV_ALL_SIGNALS
1969		#undef FAULT_HANDLER
1970		#endif
1971	+	#ifdef HAVE_WIN32_EXCEPTIONS
1972	+	sigsegv_fault_handler = NULL;
1973	+	#endif
1974		}
1975
1976	+
1977	+	/*
1978	+	*  Set callback function when we cannot handle the fault
1979	+	*/
1980	+
1981	+	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
1982	+	{
1983	+	sigsegv_state_dumper = handler;
1984	+	}
1985	+
1986	+
1987		/*
1988		*  Test program used for configure/test
1989		*/
#	Line 375 | Line 1992 | void sigsegv_deinstall_handler(void)
1992		#include <stdio.h>
1993		#include <stdlib.h>
1994		#include <fcntl.h>
1995	+	#ifdef HAVE_SYS_MMAN_H
1996		#include <sys/mman.h>
1997	+	#endif
1998		#include "vm_alloc.h"
1999
2000	+	const int REF_INDEX = 123;
2001	+	const int REF_VALUE = 45;
2002	+
2003		static int page_size;
2004		static volatile char * page = 0;
2005		static volatile int handler_called = 0;
2006
2007	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2007	>	#ifdef __GNUC__
2008	>	// Code range where we expect the fault to come from
2009	>	static void *b_region, *e_region;
2010	>	#endif
2011	>
2012	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2013		{
2014	+	#if DEBUG
2015	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
2016	+	printf("expected fault at %p\n", page + REF_INDEX);
2017	+	#ifdef __GNUC__
2018	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
2019	+	#endif
2020	+	#endif
2021		handler_called++;
2022	<	if ((fault_address - 123) != page)
2023	<	exit(1);
2022	>	if ((fault_address - REF_INDEX) != page)
2023	>	exit(10);
2024	>	#ifdef __GNUC__
2025	>	// Make sure reported fault instruction address falls into
2026	>	// expected code range
2027	>	if (instruction_address != SIGSEGV_INVALID_PC
2028	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
2029	>	(instruction_address >= (sigsegv_address_t)e_region)))
2030	>	exit(11);
2031	>	#endif
2032		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
2033	<	exit(1);
2033	>	exit(12);
2034	>	return SIGSEGV_RETURN_SUCCESS;
2035	>	}
2036	>
2037	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2038	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2039	>	{
2040	>	#if DEBUG
2041	>	printf("sigsegv_insn_handler(%p, %p)\n", fault_address, instruction_address);
2042	>	#endif
2043	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
2044	>	#ifdef __GNUC__
2045	>	// Make sure reported fault instruction address falls into
2046	>	// expected code range
2047	>	if (instruction_address != SIGSEGV_INVALID_PC
2048	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
2049	>	(instruction_address >= (sigsegv_address_t)e_region)))
2050	>	return SIGSEGV_RETURN_FAILURE;
2051	>	#endif
2052	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
2053	>	}
2054	>
2055	>	return SIGSEGV_RETURN_FAILURE;
2056	>	}
2057	>
2058	>	// More sophisticated tests for instruction skipper
2059	>	static bool arch_insn_skipper_tests()
2060	>	{
2061	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
2062	>	static const unsigned char code[] = {
2063	>	0x8a, 0x00,                    // mov    (%eax),%al
2064	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
2065	>	0x88, 0x20,                    // mov    %ah,(%eax)
2066	>	0x88, 0x08,                    // mov    %cl,(%eax)
2067	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
2068	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
2069	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
2070	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
2071	>	0x8b, 0x00,                    // mov    (%eax),%eax
2072	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
2073	>	0x89, 0x00,                    // mov    %eax,(%eax)
2074	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
2075	>	#if defined(__x86_64__)
2076	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
2077	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
2078	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
2079	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
2080	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
2081	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
2082	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
2083	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
2084	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
2085	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
2086	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
2087	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
2088	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
2089	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
2090	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
2091	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
2092	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
2093	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
2094	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
2095	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
2096	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
2097	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
2098	>	#endif
2099	>	0                              // end
2100	>	};
2101	>	const int N_REGS = 20;
2102	>	unsigned long regs[N_REGS];
2103	>	for (int i = 0; i < N_REGS; i++)
2104	>	regs[i] = i;
2105	>	const unsigned long start_code = (unsigned long)&code;
2106	>	regs[X86_REG_EIP] = start_code;
2107	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
2108	>	&& ix86_skip_instruction(regs))
2109	>	; /* simply iterate */
2110	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
2111	>	#endif
2112		return true;
2113		}
2114	+	#endif
2115
2116		int main(void)
2117		{
2118		if (vm_init() < 0)
2119		return 1;
2120
2121	+	#ifdef _WIN32
2122	+	page_size = 4096;
2123	+	#else
2124		page_size = getpagesize();
2125	+	#endif
2126		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
2127	<	return 1;
2127	>	return 2;
2128
2129	+	memset((void *)page, 0, page_size);
2130		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
2131	<	return 1;
2131	>	return 3;
2132
2133		if (!sigsegv_install_handler(sigsegv_test_handler))
2134	<	return 1;
409	<
410	<	page[123] = 45;
411	<	page[123] = 45;
2134	>	return 4;
2135
2136	+	#ifdef __GNUC__
2137	+	b_region = &&L_b_region1;
2138	+	e_region = &&L_e_region1;
2139	+	#endif
2140	+	L_b_region1:
2141	+	page[REF_INDEX] = REF_VALUE;
2142	+	if (page[REF_INDEX] != REF_VALUE)
2143	+	exit(20);
2144	+	page[REF_INDEX] = REF_VALUE;
2145	+	L_e_region1:
2146	+
2147		if (handler_called != 1)
2148	<	return 1;
2148	>	return 5;
2149	>
2150	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2151	>	if (!sigsegv_install_handler(sigsegv_insn_handler))
2152	>	return 6;
2153	>
2154	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
2155	>	return 7;
2156	>
2157	>	for (int i = 0; i < page_size; i++)
2158	>	page[i] = (i + 1) % page_size;
2159	>
2160	>	if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
2161	>	return 8;
2162	>
2163	>	#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
2164	>	const unsigned long TAG = 0x12345678 |                  \
2165	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
2166	>	TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
2167	>	volatile unsigned long effect = data + TAG;             \
2168	>	if (effect != TAG)                                                              \
2169	>	return 9;                                                                       \
2170	>	} while (0)
2171	>
2172	>	#ifdef __GNUC__
2173	>	b_region = &&L_b_region2;
2174	>	e_region = &&L_e_region2;
2175	>	#endif
2176	>	L_b_region2:
2177	>	TEST_SKIP_INSTRUCTION(unsigned char);
2178	>	TEST_SKIP_INSTRUCTION(unsigned short);
2179	>	TEST_SKIP_INSTRUCTION(unsigned int);
2180	>	TEST_SKIP_INSTRUCTION(unsigned long);
2181	>	TEST_SKIP_INSTRUCTION(signed char);
2182	>	TEST_SKIP_INSTRUCTION(signed short);
2183	>	TEST_SKIP_INSTRUCTION(signed int);
2184	>	TEST_SKIP_INSTRUCTION(signed long);
2185	>	L_e_region2:
2186	>
2187	>	if (!arch_insn_skipper_tests())
2188	>	return 20;
2189	>	#endif
2190
2191		vm_exit();
2192		return 0;

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