[ViewVC] Diff of: cebix/BasiliskII/src/Unix/sigsegv.cpp

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.21 by gbeauche, 2002-10-03T15:49:14Z vs.
Revision 1.53 by gbeauche, 2005-02-20T11:39:12Z

#	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 40 \| Line 52
52		// Type of the system signal handler
53		typedef RETSIGTYPE (*signal_handler)(int);
54
43	–	// Is the fault to be ignored?
44	–	static bool sigsegv_ignore_fault = false;
45	–
55		// User's SIGSEGV handler
56		static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
57
#	Line 57 \| Line 66 \| static bool sigsegv_do_install_handler(i
66		* Instruction decoding aids
67		*/
68
60	–	// Transfer type
61	–	enum transfer_type_t {
62	–	TYPE_UNKNOWN,
63	–	TYPE_LOAD,
64	–	TYPE_STORE
65	–	};
66	–
69		// Transfer size
70		enum transfer_size_t {
71		SIZE_UNKNOWN,
72		SIZE_BYTE,
73	<	SIZE_WORD,
74	<	SIZE_LONG
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 {
#	Line 91 \| Line 97 \| struct instruction_t {
97		char ra, rd;
98		};
99
100	<	static void powerpc_decode_instruction(instruction_t instruction, unsigned int nip, unsigned int gpr)
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 )nip);
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;
#	Line 103 \| Line 109 \| static void powerpc_decode_instruction(i
109		signed int imm = (signed short)(opcode & 0xffff);
110
111		// Analyze opcode
112	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
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 = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
119	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
120		case 55: // lwzux
121	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
121	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
122		case 87: // lbzx
123	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
123	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
124		case 119: // lbzux
125	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
125	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
126		case 151: // stwx
127	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
127	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
128		case 183: // stwux
129	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
129	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
130		case 215: // stbx
131	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
131	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
132		case 247: // stbux
133	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
133	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
134		case 279: // lhzx
135	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
135	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
136		case 311: // lhzux
137	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
137	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
138		case 343: // lhax
139	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
139	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
140		case 375: // lhaux
141	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
141	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
142		case 407: // sthx
143	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
143	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
144		case 439: // sthux
145	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
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 = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
150	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
151		case 33: // lwzu
152	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
152	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
153		case 34: // lbz
154	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
154	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
155		case 35: // lbzu
156	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
156	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
157		case 36: // stw
158	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
158	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
159		case 37: // stwu
160	<	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
160	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
161		case 38: // stb
162	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
162	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
163		case 39: // stbu
164	<	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
164	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
165		case 40: // lhz
166	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
166	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
167		case 41: // lhzu
168	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
168	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
169		case 42: // lha
170	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
170	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
171		case 43: // lhau
172	<	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
172	>	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
173		case 44: // sth
174	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
174	>	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
175		case 45: // sthu
176	<	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
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
#	Line 208 \| Line 226 \| static void powerpc_decode_instruction(i
226
227		#if HAVE_SIGINFO_T
228		// Generic extended signal handler
229	<	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
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(__NetBSD__) \|\| defined(__FreeBSD__)
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 int )&(((struct sigcontext )scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
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	+	#if (defined(powerpc) \|\| defined(__powerpc__))
276	+	#include <sys/ucontext.h>
277	+	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.__gregs)
278	+	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[_REG_PC]
279	+	#define SIGSEGV_REGISTER_FILE (unsigned long )&SIGSEGV_CONTEXT_REGS[_REG_PC], (unsigned long )&SIGSEGV_CONTEXT_REGS[_REG_R0]
280	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
281	+	#endif
282	+	#endif
283		#if defined(__linux__)
284		#if (defined(i386) \|\| defined(__i386__))
285		#include <sys/ucontext.h>
286		#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
287		#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
288	<	#define SIGSEGV_REGISTER_FILE (unsigned int *)SIGSEGV_CONTEXT_REGS
288	>	#define SIGSEGV_REGISTER_FILE (unsigned long *)SIGSEGV_CONTEXT_REGS
289		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
290		#endif
291		#if (defined(x86_64) \|\| defined(__x86_64__))
#	Line 235 \| Line 293 \| static void powerpc_decode_instruction(i
293		#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
294		#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
295		#define SIGSEGV_REGISTER_FILE (unsigned long *)SIGSEGV_CONTEXT_REGS
296	+	#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
297		#endif
298		#if (defined(ia64) \|\| defined(__ia64__))
299		#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext )scp)->sc_ip & ~0x3ULL) / slot number is in bits 0 and 1 */
#	Line 243 \| Line 302 \| static void powerpc_decode_instruction(i
302		#include <sys/ucontext.h>
303		#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.regs)
304		#define SIGSEGV_FAULT_INSTRUCTION (SIGSEGV_CONTEXT_REGS->nip)
305	<	#define SIGSEGV_REGISTER_FILE (unsigned int )&SIGSEGV_CONTEXT_REGS->nip, (unsigned int )(SIGSEGV_CONTEXT_REGS->gpr)
305	>	#define SIGSEGV_REGISTER_FILE (unsigned long )&SIGSEGV_CONTEXT_REGS->nip, (unsigned long )(SIGSEGV_CONTEXT_REGS->gpr)
306		#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
307		#endif
308	+	#if (defined(hppa) \|\| defined(__hppa__))
309	+	#undef SIGSEGV_FAULT_ADDRESS
310	+	#define SIGSEGV_FAULT_ADDRESS sip->si_ptr
311	+	#endif
312	+	#if (defined(arm) \|\| defined(__arm__))
313	+	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
314	+	#define SIGSEGV_CONTEXT_REGS (((struct ucontext *)scp)->uc_mcontext)
315	+	#define SIGSEGV_FAULT_INSTRUCTION (SIGSEGV_CONTEXT_REGS.arm_pc)
316	+	#define SIGSEGV_REGISTER_FILE (&SIGSEGV_CONTEXT_REGS.arm_r0)
317	+	#define SIGSEGV_SKIP_INSTRUCTION arm_skip_instruction
318	+	#endif
319		#endif
320		#endif
321
#	Line 256 \| Line 326 \| static void powerpc_decode_instruction(i
326		#if (defined(i386) \|\| defined(__i386__))
327		#include <asm/sigcontext.h>
328		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext scs
329	<	#define SIGSEGV_FAULT_ADDRESS scs.cr2
330	<	#define SIGSEGV_FAULT_INSTRUCTION scs.eip
331	<	#define SIGSEGV_REGISTER_FILE (unsigned int *)(&scs)
329	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
330	>	#define SIGSEGV_FAULT_HANDLER_ARGS &scs
331	>	#define SIGSEGV_FAULT_ADDRESS scp->cr2
332	>	#define SIGSEGV_FAULT_INSTRUCTION scp->eip
333	>	#define SIGSEGV_REGISTER_FILE (unsigned long *)scp
334		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
335		#endif
336		#if (defined(sparc) \|\| defined(__sparc__))
337		#include <asm/sigcontext.h>
338		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext scp, char addr
339	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr
340		#define SIGSEGV_FAULT_ADDRESS addr
341		#endif
342		#if (defined(powerpc) \|\| defined(__powerpc__))
343		#include <asm/sigcontext.h>
344		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp
345	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, scp
346		#define SIGSEGV_FAULT_ADDRESS scp->regs->dar
347		#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip
348	<	#define SIGSEGV_REGISTER_FILE (unsigned int )&scp->regs->nip, (unsigned int )(scp->regs->gpr)
348	>	#define SIGSEGV_REGISTER_FILE (unsigned long )&scp->regs->nip, (unsigned long )(scp->regs->gpr)
349		#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
350		#endif
351		#if (defined(alpha) \|\| defined(__alpha__))
352		#include <asm/sigcontext.h>
353		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
354	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
355		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
356		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_pc
357	<
358	<	// From Boehm's GC 6.0alpha8
359	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
360	<	{
361	<	unsigned int instruction = ((unsigned int )(scp->sc_pc));
362	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
363	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
364	<	return (sigsegv_address_t)fault_address;
365	<	}
357	>	#endif
358	>	#if (defined(arm) \|\| defined(__arm__))
359	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int r1, int r2, int r3, struct sigcontext sc
360	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
361	>	#define SIGSEGV_FAULT_HANDLER_ARGS &sc
362	>	#define SIGSEGV_FAULT_ADDRESS scp->fault_address
363	>	#define SIGSEGV_FAULT_INSTRUCTION scp->arm_pc
364	>	#define SIGSEGV_REGISTER_FILE &scp->arm_r0
365	>	#define SIGSEGV_SKIP_INSTRUCTION arm_skip_instruction
366		#endif
367		#endif
368
369		// Irix 5 or 6 on MIPS
370	<	#if (defined(sgi) \|\| defined(__sgi)) && (defined(SYSTYPE_SVR4) \|\| defined(__SYSTYPE_SVR4))
370	>	#if (defined(sgi) \|\| defined(__sgi)) && (defined(SYSTYPE_SVR4) \|\| defined(_SYSTYPE_SVR4))
371		#include <ucontext.h>
372		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
373	<	#define SIGSEGV_FAULT_ADDRESS scp->sc_badvaddr
373	>	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
374	>	#define SIGSEGV_FAULT_ADDRESS (unsigned long)scp->sc_badvaddr
375	>	#define SIGSEGV_FAULT_INSTRUCTION (unsigned long)scp->sc_pc
376		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
377		#endif
378
379		// HP-UX
380		#if (defined(hpux) \|\| defined(__hpux__))
381		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
382	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
383		#define SIGSEGV_FAULT_ADDRESS scp->sc_sl.sl_ss.ss_narrow.ss_cr21
384		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
385		#endif
#	Line 310 \| Line 388 \| static sigsegv_address_t get_fault_addre
388		#if defined(__osf__)
389		#include <ucontext.h>
390		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
391	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
392		#define SIGSEGV_FAULT_ADDRESS scp->sc_traparg_a0
393		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
394		#endif
#	Line 317 \| Line 396 \| static sigsegv_address_t get_fault_addre
396		// AIX
397		#if defined(_AIX)
398		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
399	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
400		#define SIGSEGV_FAULT_ADDRESS scp->sc_jmpbuf.jmp_context.o_vaddr
401		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
402		#endif
403
404	<	// NetBSD or FreeBSD
405	<	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
404	>	// NetBSD
405	>	#if defined(__NetBSD__)
406		#if (defined(m68k) \|\| defined(__m68k__))
407		#include <m68k/frame.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 get_fault_address(scp)
411		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
412
#	Line 349 \| Line 430 \| static sigsegv_address_t get_fault_addre
430		}
431		return (sigsegv_address_t)fault_addr;
432		}
433	<	#else
434	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, void scp, char addr
435	<	#define SIGSEGV_FAULT_ADDRESS addr
433	>	#endif
434	>	#if (defined(alpha) \|\| defined(__alpha__))
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_FAULT_ADDRESS get_fault_address(scp)
438	>	#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
439	>	#endif
440	>	#if (defined(i386) \|\| defined(__i386__))
441	>	#error "FIXME: need to decode instruction and compute EA"
442	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
443	>	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
444	>	#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
445	>	#endif
446	>	#endif
447	>	#if defined(__FreeBSD__)
448	>	#if (defined(i386) \|\| defined(__i386__))
449		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
450	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext scp, char addr
451	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr
452	+	#define SIGSEGV_FAULT_ADDRESS addr
453	+	#define SIGSEGV_FAULT_INSTRUCTION scp->sc_eip
454	+	#define SIGSEGV_REGISTER_FILE ((unsigned long *)&scp->sc_edi)
455	+	#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
456	+	#endif
457	+	#if (defined(alpha) \|\| defined(__alpha__))
458	+	#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
459	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, char addr, struct sigcontext scp
460	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, addr, scp
461	+	#define SIGSEGV_FAULT_ADDRESS addr
462	+	#define SIGSEGV_FAULT_INSTRUCTION scp->sc_pc
463		#endif
464		#endif
465
466	<	// MacOS X
466	>	// Extract fault address out of a sigcontext
467	>	#if (defined(alpha) \|\| defined(__alpha__))
468	>	// From Boehm's GC 6.0alpha8
469	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
470	>	{
471	>	unsigned int instruction = ((unsigned int )(scp->sc_pc));
472	>	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
473	>	fault_address += (signed long)(signed short)(instruction & 0xffff);
474	>	return (sigsegv_address_t)fault_address;
475	>	}
476	>	#endif
477	>
478	>
479	>	// MacOS X, not sure which version this works in. Under 10.1
480	>	// vm_protect does not appear to work from a signal handler. Under
481	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
482	>	// field is the address of the faulting instruction and not the
483	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
484	>	// case with Mach exception handlers there is a way to do what this
485	>	// was meant to do.
486	>	#ifndef HAVE_MACH_EXCEPTIONS
487		#if defined(__APPLE__) && defined(__MACH__)
488		#if (defined(ppc) \|\| defined(__ppc__))
489		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
490	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
491		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
492		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir
493		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
#	Line 379 \| Line 507 \| static sigsegv_address_t get_fault_addre
507		#endif
508		#endif
509		#endif
510	+	#endif
511	+
512	+	#if HAVE_WIN32_EXCEPTIONS
513	+	#define WIN32_LEAN_AND_MEAN /* avoid including junk */
514	+	#include <windows.h>
515	+	#include <winerror.h>
516	+
517	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST EXCEPTION_POINTERS *ExceptionInfo
518	+	#define SIGSEGV_FAULT_HANDLER_ARGS ExceptionInfo
519	+	#define SIGSEGV_FAULT_ADDRESS ExceptionInfo->ExceptionRecord->ExceptionInformation[1]
520	+	#define SIGSEGV_CONTEXT_REGS ExceptionInfo->ContextRecord
521	+	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS->Eip
522	+	#define SIGSEGV_REGISTER_FILE ((unsigned long *)&SIGSEGV_CONTEXT_REGS->Edi)
523	+	#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
524	+	#endif
525	+
526	+	#if HAVE_MACH_EXCEPTIONS
527	+
528	+	// This can easily be extended to other Mach systems, but really who
529	+	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
530	+	// Mach 2.5/3.0?
531	+	#if defined(__APPLE__) && defined(__MACH__)
532	+
533	+	#include <sys/types.h>
534	+	#include <stdlib.h>
535	+	#include <stdio.h>
536	+	#include <pthread.h>
537	+
538	+	/*
539	+	* If you are familiar with MIG then you will understand the frustration
540	+	* that was necessary to get these embedded into C++ code by hand.
541	+	*/
542	+	extern "C" {
543	+	#include <mach/mach.h>
544	+	#include <mach/mach_error.h>
545	+
546	+	extern boolean_t exc_server(mach_msg_header_t , mach_msg_header_t );
547	+	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
548	+	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
549	+	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
550	+	exception_type_t, exception_data_t, mach_msg_type_number_t);
551	+	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
552	+	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
553	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
554	+	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
555	+	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
556	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
557	+	}
558	+
559	+	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
560	+	#define HANDLER_COUNT 64
561	+
562	+	// structure to tuck away existing exception handlers
563	+	typedef struct _ExceptionPorts {
564	+	mach_msg_type_number_t maskCount;
565	+	exception_mask_t masks[HANDLER_COUNT];
566	+	exception_handler_t handlers[HANDLER_COUNT];
567	+	exception_behavior_t behaviors[HANDLER_COUNT];
568	+	thread_state_flavor_t flavors[HANDLER_COUNT];
569	+	} ExceptionPorts;
570	+
571	+	// exception handler thread
572	+	static pthread_t exc_thread;
573	+
574	+	// place where old exception handler info is stored
575	+	static ExceptionPorts ports;
576	+
577	+	// our exception port
578	+	static mach_port_t _exceptionPort = MACH_PORT_NULL;
579	+
580	+	#define MACH_CHECK_ERROR(name,ret) \
581	+	if (ret != KERN_SUCCESS) { \
582	+	mach_error(#name, ret); \
583	+	exit (1); \
584	+	}
585	+
586	+	#define SIGSEGV_FAULT_ADDRESS code[1]
587	+	#define SIGSEGV_FAULT_INSTRUCTION get_fault_instruction(thread, state)
588	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP) ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
589	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
590	+	#define SIGSEGV_FAULT_HANDLER_ARGS thread, code, &state
591	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
592	+	#define SIGSEGV_REGISTER_FILE &state->srr0, &state->r0
593	+
594	+	// Given a suspended thread, stuff the current instruction and
595	+	// registers into state.
596	+	//
597	+	// It would have been nice to have this be ppc/x86 independant which
598	+	// could have been done easily with a thread_state_t instead of
599	+	// ppc_thread_state_t, but because of the way this is called it is
600	+	// easier to do it this way.
601	+	#if (defined(ppc) \|\| defined(__ppc__))
602	+	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
603	+	{
604	+	kern_return_t krc;
605	+	mach_msg_type_number_t count;
606	+
607	+	count = MACHINE_THREAD_STATE_COUNT;
608	+	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
609	+	MACH_CHECK_ERROR (thread_get_state, krc);
610	+
611	+	return (sigsegv_address_t)state->srr0;
612	+	}
613	+	#endif
614	+
615	+	// Since there can only be one exception thread running at any time
616	+	// this is not a problem.
617	+	#define MSG_SIZE 512
618	+	static char msgbuf[MSG_SIZE];
619	+	static char replybuf[MSG_SIZE];
620	+
621	+	/*
622	+	* This is the entry point for the exception handler thread. The job
623	+	* of this thread is to wait for exception messages on the exception
624	+	* port that was setup beforehand and to pass them on to exc_server.
625	+	* exc_server is a MIG generated function that is a part of Mach.
626	+	* Its job is to decide what to do with the exception message. In our
627	+	* case exc_server calls catch_exception_raise on our behalf. After
628	+	* exc_server returns, it is our responsibility to send the reply.
629	+	*/
630	+	static void *
631	+	handleExceptions(void *priv)
632	+	{
633	+	mach_msg_header_t msg, reply;
634	+	kern_return_t krc;
635	+
636	+	msg = (mach_msg_header_t *)msgbuf;
637	+	reply = (mach_msg_header_t *)replybuf;
638	+
639	+	for (;;) {
640	+	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
641	+	_exceptionPort, 0, MACH_PORT_NULL);
642	+	MACH_CHECK_ERROR(mach_msg, krc);
643	+
644	+	if (!exc_server(msg, reply)) {
645	+	fprintf(stderr, "exc_server hated the message\n");
646	+	exit(1);
647	+	}
648	+
649	+	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
650	+	msg->msgh_local_port, 0, MACH_PORT_NULL);
651	+	if (krc != KERN_SUCCESS) {
652	+	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
653	+	krc, mach_error_string(krc));
654	+	exit(1);
655	+	}
656	+	}
657	+	}
658	+	#endif
659	+	#endif
660
661
662		/*
#	Line 387 \| Line 665 \| static sigsegv_address_t get_fault_addre
665
666		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
667		// Decode and skip X86 instruction
668	<	#if (defined(i386) \|\| defined(__i386__))
668	>	#if (defined(i386) \|\| defined(__i386__)) \|\| defined(__x86_64__)
669		#if defined(__linux__)
670		enum {
671	+	#if (defined(i386) \|\| defined(__i386__))
672		X86_REG_EIP = 14,
673		X86_REG_EAX = 11,
674		X86_REG_ECX = 10,
#	Line 399 \| Line 678 \| enum {
678		X86_REG_EBP = 6,
679		X86_REG_ESI = 5,
680		X86_REG_EDI = 4
681	+	#endif
682	+	#if defined(__x86_64__)
683	+	X86_REG_R8 = 0,
684	+	X86_REG_R9 = 1,
685	+	X86_REG_R10 = 2,
686	+	X86_REG_R11 = 3,
687	+	X86_REG_R12 = 4,
688	+	X86_REG_R13 = 5,
689	+	X86_REG_R14 = 6,
690	+	X86_REG_R15 = 7,
691	+	X86_REG_EDI = 8,
692	+	X86_REG_ESI = 9,
693	+	X86_REG_EBP = 10,
694	+	X86_REG_EBX = 11,
695	+	X86_REG_EDX = 12,
696	+	X86_REG_EAX = 13,
697	+	X86_REG_ECX = 14,
698	+	X86_REG_ESP = 15,
699	+	X86_REG_EIP = 16
700	+	#endif
701	+	};
702	+	#endif
703	+	#if defined(__NetBSD__)
704	+	enum {
705	+	#if (defined(i386) \|\| defined(__i386__))
706	+	X86_REG_EIP = _REG_EIP,
707	+	X86_REG_EAX = _REG_EAX,
708	+	X86_REG_ECX = _REG_ECX,
709	+	X86_REG_EDX = _REG_EDX,
710	+	X86_REG_EBX = _REG_EBX,
711	+	X86_REG_ESP = _REG_ESP,
712	+	X86_REG_EBP = _REG_EBP,
713	+	X86_REG_ESI = _REG_ESI,
714	+	X86_REG_EDI = _REG_EDI
715	+	#endif
716		};
717		#endif
718	<	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
718	>	#if defined(__FreeBSD__)
719		enum {
720	+	#if (defined(i386) \|\| defined(__i386__))
721		X86_REG_EIP = 10,
722		X86_REG_EAX = 7,
723		X86_REG_ECX = 6,
#	Line 412 \| Line 727 \| enum {
727		X86_REG_EBP = 2,
728		X86_REG_ESI = 1,
729		X86_REG_EDI = 0
730	+	#endif
731	+	};
732	+	#endif
733	+	#if defined(_WIN32)
734	+	enum {
735	+	#if (defined(i386) \|\| defined(__i386__))
736	+	X86_REG_EIP = 7,
737	+	X86_REG_EAX = 5,
738	+	X86_REG_ECX = 4,
739	+	X86_REG_EDX = 3,
740	+	X86_REG_EBX = 2,
741	+	X86_REG_ESP = 10,
742	+	X86_REG_EBP = 6,
743	+	X86_REG_ESI = 1,
744	+	X86_REG_EDI = 0
745	+	#endif
746		};
747		#endif
748		// FIXME: this is partly redundant with the instruction decoding phase
#	Line 448 \| Line 779 \| static inline int ix86_step_over_modrm(u
779		return offset;
780		}
781
782	<	static bool ix86_skip_instruction(unsigned int * regs)
782	>	static bool ix86_skip_instruction(unsigned long * regs)
783		{
784		unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
785
786		if (eip == 0)
787		return false;
788	+	#ifdef _WIN32
789	+	if (IsBadCodePtr((FARPROC)eip))
790	+	return false;
791	+	#endif
792
793	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
793	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
794		transfer_size_t transfer_size = SIZE_LONG;
795
796		int reg = -1;
797		int len = 0;
798	<
798	>
799	>	#if DEBUG
800	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
801	>	eip, eip[0], eip[1], eip[2], eip[3]);
802	>	#endif
803	>
804		// Operand size prefix
805		if (*eip == 0x66) {
806		eip++;
#	Line 468 \| Line 808 \| static bool ix86_skip_instruction(unsign
808		transfer_size = SIZE_WORD;
809		}
810
811	+	// REX prefix
812	+	#if defined(__x86_64__)
813	+	struct rex_t {
814	+	unsigned char W;
815	+	unsigned char R;
816	+	unsigned char X;
817	+	unsigned char B;
818	+	};
819	+	rex_t rex = { 0, 0, 0, 0 };
820	+	bool has_rex = false;
821	+	if ((*eip & 0xf0) == 0x40) {
822	+	has_rex = true;
823	+	const unsigned char b = *eip;
824	+	rex.W = b & (1 << 3);
825	+	rex.R = b & (1 << 2);
826	+	rex.X = b & (1 << 1);
827	+	rex.B = b & (1 << 0);
828	+	#if DEBUG
829	+	printf("REX: %c,%c,%c,%c\n",
830	+	rex.W ? 'W' : '_',
831	+	rex.R ? 'R' : '_',
832	+	rex.X ? 'X' : '_',
833	+	rex.B ? 'B' : '_');
834	+	#endif
835	+	eip++;
836	+	len++;
837	+	if (rex.W)
838	+	transfer_size = SIZE_QUAD;
839	+	}
840	+	#else
841	+	const bool has_rex = false;
842	+	#endif
843	+
844		// Decode instruction
845	+	int target_size = SIZE_UNKNOWN;
846		switch (eip[0]) {
847		case 0x0f:
848	+	target_size = transfer_size;
849		switch (eip[1]) {
850	+	case 0xbe: // MOVSX r32, r/m8
851		case 0xb6: // MOVZX r32, r/m8
852	+	transfer_size = SIZE_BYTE;
853	+	goto do_mov_extend;
854	+	case 0xbf: // MOVSX r32, r/m16
855		case 0xb7: // MOVZX r32, r/m16
856	<	switch (eip[2] & 0xc0) {
857	<	case 0x80:
858	<	reg = (eip[2] >> 3) & 7;
859	<	transfer_type = TYPE_LOAD;
860	<	break;
861	<	case 0x40:
862	<	reg = (eip[2] >> 3) & 7;
863	<	transfer_type = TYPE_LOAD;
864	<	break;
865	<	case 0x00:
866	<	reg = (eip[2] >> 3) & 7;
867	<	transfer_type = TYPE_LOAD;
868	<	break;
869	<	}
870	<	len += 3 + ix86_step_over_modrm(eip + 2);
871	<	break;
856	>	transfer_size = SIZE_WORD;
857	>	goto do_mov_extend;
858	>	do_mov_extend:
859	>	switch (eip[2] & 0xc0) {
860	>	case 0x80:
861	>	reg = (eip[2] >> 3) & 7;
862	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
863	>	break;
864	>	case 0x40:
865	>	reg = (eip[2] >> 3) & 7;
866	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
867	>	break;
868	>	case 0x00:
869	>	reg = (eip[2] >> 3) & 7;
870	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
871	>	break;
872	>	}
873	>	len += 3 + ix86_step_over_modrm(eip + 2);
874	>	break;
875		}
876		break;
877		case 0x8a: // MOV r8, r/m8
#	Line 498 \| Line 880 \| static bool ix86_skip_instruction(unsign
880		switch (eip[1] & 0xc0) {
881		case 0x80:
882		reg = (eip[1] >> 3) & 7;
883	<	transfer_type = TYPE_LOAD;
883	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
884		break;
885		case 0x40:
886		reg = (eip[1] >> 3) & 7;
887	<	transfer_type = TYPE_LOAD;
887	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
888		break;
889		case 0x00:
890		reg = (eip[1] >> 3) & 7;
891	<	transfer_type = TYPE_LOAD;
891	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
892		break;
893		}
894		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 517 \| Line 899 \| static bool ix86_skip_instruction(unsign
899		switch (eip[1] & 0xc0) {
900		case 0x80:
901		reg = (eip[1] >> 3) & 7;
902	<	transfer_type = TYPE_STORE;
902	>	transfer_type = SIGSEGV_TRANSFER_STORE;
903		break;
904		case 0x40:
905		reg = (eip[1] >> 3) & 7;
906	<	transfer_type = TYPE_STORE;
906	>	transfer_type = SIGSEGV_TRANSFER_STORE;
907		break;
908		case 0x00:
909		reg = (eip[1] >> 3) & 7;
910	<	transfer_type = TYPE_STORE;
910	>	transfer_type = SIGSEGV_TRANSFER_STORE;
911		break;
912		}
913		len += 2 + ix86_step_over_modrm(eip + 1);
914		break;
915		}
916	+	if (target_size == SIZE_UNKNOWN)
917	+	target_size = transfer_size;
918
919	<	if (transfer_type == TYPE_UNKNOWN) {
919	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
920		// Unknown machine code, let it crash. Then patch the decoder
921		return false;
922		}
923
924	<	if (transfer_type == TYPE_LOAD && reg != -1) {
925	<	static const int x86_reg_map[8] = {
924	>	#if defined(__x86_64__)
925	>	if (rex.R)
926	>	reg += 8;
927	>	#endif
928	>
929	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
930	>	static const int x86_reg_map[] = {
931		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
932	<	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
932	>	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
933	>	#if defined(__x86_64__)
934	>	X86_REG_R8, X86_REG_R9, X86_REG_R10, X86_REG_R11,
935	>	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
936	>	#endif
937		};
938
939	<	if (reg < 0 \|\| reg >= 8)
939	>	if (reg < 0 \|\| reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
940		return false;
941
942	+	// Set 0 to the relevant register part
943	+	// NOTE: this is only valid for MOV alike instructions
944		int rloc = x86_reg_map[reg];
945	<	switch (transfer_size) {
945	>	switch (target_size) {
946		case SIZE_BYTE:
947	<	regs[rloc] = (regs[rloc] & ~0xff);
947	>	if (has_rex \|\| reg < 4)
948	>	regs[rloc] = (regs[rloc] & ~0x00ffL);
949	>	else {
950	>	rloc = x86_reg_map[reg - 4];
951	>	regs[rloc] = (regs[rloc] & ~0xff00L);
952	>	}
953		break;
954		case SIZE_WORD:
955	<	regs[rloc] = (regs[rloc] & ~0xffff);
955	>	regs[rloc] = (regs[rloc] & ~0xffffL);
956		break;
957		case SIZE_LONG:
958	+	case SIZE_QUAD: // zero-extension
959		regs[rloc] = 0;
960		break;
961		}
#	Line 562 \| Line 963 \| static bool ix86_skip_instruction(unsign
963
964		#if DEBUG
965		printf("%08x: %s %s access", regs[X86_REG_EIP],
966	<	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
967	<	transfer_type == TYPE_LOAD ? "read" : "write");
966	>	transfer_size == SIZE_BYTE ? "byte" :
967	>	transfer_size == SIZE_WORD ? "word" :
968	>	transfer_size == SIZE_LONG ? "long" :
969	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
970	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
971
972		if (reg != -1) {
973	<	static const char * x86_reg_str_map[8] = {
974	<	"eax", "ecx", "edx", "ebx",
975	<	"esp", "ebp", "esi", "edi"
973	>	static const char * x86_byte_reg_str_map[] = {
974	>	"al", "cl", "dl", "bl",
975	>	"spl", "bpl", "sil", "dil",
976	>	"r8b", "r9b", "r10b", "r11b",
977	>	"r12b", "r13b", "r14b", "r15b",
978	>	"ah", "ch", "dh", "bh",
979	>	};
980	>	static const char * x86_word_reg_str_map[] = {
981	>	"ax", "cx", "dx", "bx",
982	>	"sp", "bp", "si", "di",
983	>	"r8w", "r9w", "r10w", "r11w",
984	>	"r12w", "r13w", "r14w", "r15w",
985		};
986	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
986	>	static const char *x86_long_reg_str_map[] = {
987	>	"eax", "ecx", "edx", "ebx",
988	>	"esp", "ebp", "esi", "edi",
989	>	"r8d", "r9d", "r10d", "r11d",
990	>	"r12d", "r13d", "r14d", "r15d",
991	>	};
992	>	static const char *x86_quad_reg_str_map[] = {
993	>	"rax", "rcx", "rdx", "rbx",
994	>	"rsp", "rbp", "rsi", "rdi",
995	>	"r8", "r9", "r10", "r11",
996	>	"r12", "r13", "r14", "r15",
997	>	};
998	>	const char * reg_str = NULL;
999	>	switch (target_size) {
1000	>	case SIZE_BYTE:
1001	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
1002	>	break;
1003	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
1004	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
1005	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
1006	>	}
1007	>	if (reg_str)
1008	>	printf(" %s register %%%s",
1009	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
1010	>	reg_str);
1011		}
1012		printf(", %d bytes instruction\n", len);
1013		#endif
#	Line 582 \| Line 1019 \| static bool ix86_skip_instruction(unsign
1019
1020		// Decode and skip PPC instruction
1021		#if (defined(powerpc) \|\| defined(__powerpc__) \|\| defined(__ppc__))
1022	<	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
1022	>	static bool powerpc_skip_instruction(unsigned long * nip_p, unsigned long * regs)
1023		{
1024		instruction_t instr;
1025		powerpc_decode_instruction(&instr, *nip_p, regs);
1026
1027	<	if (instr.transfer_type == TYPE_UNKNOWN) {
1027	>	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1028		// Unknown machine code, let it crash. Then patch the decoder
1029		return false;
1030		}
1031
1032		#if DEBUG
1033		printf("%08x: %s %s access", *nip_p,
1034	<	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
1035	<	instr.transfer_type == TYPE_LOAD ? "read" : "write");
1034	>	instr.transfer_size == SIZE_BYTE ? "byte" :
1035	>	instr.transfer_size == SIZE_WORD ? "word" :
1036	>	instr.transfer_size == SIZE_LONG ? "long" : "quad",
1037	>	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1038
1039		if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
1040		printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
1041	<	if (instr.transfer_type == TYPE_LOAD)
1041	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1042		printf(" r%d (rd = 0)\n", instr.rd);
1043		#endif
1044
1045		if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
1046		regs[instr.ra] = instr.addr;
1047	<	if (instr.transfer_type == TYPE_LOAD)
1047	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1048		regs[instr.rd] = 0;
1049
1050		*nip_p += 4;
1051		return true;
1052		}
1053		#endif
1054	+
1055	+	// Decode and skip MIPS instruction
1056	+	#if (defined(mips) \|\| defined(__mips))
1057	+	enum {
1058	+	#if (defined(sgi) \|\| defined(__sgi))
1059	+	MIPS_REG_EPC = 35,
1060	+	#endif
1061	+	};
1062	+	static bool mips_skip_instruction(greg_t * regs)
1063	+	{
1064	+	unsigned int * epc = (unsigned int *)(unsigned long)regs[MIPS_REG_EPC];
1065	+
1066	+	if (epc == 0)
1067	+	return false;
1068	+
1069	+	#if DEBUG
1070	+	printf("IP: %p [%08x]\n", epc, epc[0]);
1071	+	#endif
1072	+
1073	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1074	+	transfer_size_t transfer_size = SIZE_LONG;
1075	+	int direction = 0;
1076	+
1077	+	const unsigned int opcode = epc[0];
1078	+	switch (opcode >> 26) {
1079	+	case 32: // Load Byte
1080	+	case 36: // Load Byte Unsigned
1081	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1082	+	transfer_size = SIZE_BYTE;
1083	+	break;
1084	+	case 33: // Load Halfword
1085	+	case 37: // Load Halfword Unsigned
1086	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1087	+	transfer_size = SIZE_WORD;
1088	+	break;
1089	+	case 35: // Load Word
1090	+	case 39: // Load Word Unsigned
1091	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1092	+	transfer_size = SIZE_LONG;
1093	+	break;
1094	+	case 34: // Load Word Left
1095	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1096	+	transfer_size = SIZE_LONG;
1097	+	direction = -1;
1098	+	break;
1099	+	case 38: // Load Word Right
1100	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1101	+	transfer_size = SIZE_LONG;
1102	+	direction = 1;
1103	+	break;
1104	+	case 55: // Load Doubleword
1105	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1106	+	transfer_size = SIZE_QUAD;
1107	+	break;
1108	+	case 26: // Load Doubleword Left
1109	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1110	+	transfer_size = SIZE_QUAD;
1111	+	direction = -1;
1112	+	break;
1113	+	case 27: // Load Doubleword Right
1114	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1115	+	transfer_size = SIZE_QUAD;
1116	+	direction = 1;
1117	+	break;
1118	+	case 40: // Store Byte
1119	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1120	+	transfer_size = SIZE_BYTE;
1121	+	break;
1122	+	case 41: // Store Halfword
1123	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1124	+	transfer_size = SIZE_WORD;
1125	+	break;
1126	+	case 43: // Store Word
1127	+	case 42: // Store Word Left
1128	+	case 46: // Store Word Right
1129	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1130	+	transfer_size = SIZE_LONG;
1131	+	break;
1132	+	case 63: // Store Doubleword
1133	+	case 44: // Store Doubleword Left
1134	+	case 45: // Store Doubleword Right
1135	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1136	+	transfer_size = SIZE_QUAD;
1137	+	break;
1138	+	/* Misc instructions unlikely to be used within CPU emulators */
1139	+	case 48: // Load Linked Word
1140	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1141	+	transfer_size = SIZE_LONG;
1142	+	break;
1143	+	case 52: // Load Linked Doubleword
1144	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1145	+	transfer_size = SIZE_QUAD;
1146	+	break;
1147	+	case 56: // Store Conditional Word
1148	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1149	+	transfer_size = SIZE_LONG;
1150	+	break;
1151	+	case 60: // Store Conditional Doubleword
1152	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1153	+	transfer_size = SIZE_QUAD;
1154	+	break;
1155	+	}
1156	+
1157	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1158	+	// Unknown machine code, let it crash. Then patch the decoder
1159	+	return false;
1160	+	}
1161	+
1162	+	// Zero target register in case of a load operation
1163	+	const int reg = (opcode >> 16) & 0x1f;
1164	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
1165	+	if (direction == 0)
1166	+	regs[reg] = 0;
1167	+	else {
1168	+	// FIXME: untested code
1169	+	unsigned long ea = regs[(opcode >> 21) & 0x1f];
1170	+	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
1171	+	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
1172	+	unsigned long value;
1173	+	if (direction > 0) {
1174	+	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
1175	+	value = regs[reg] & rmask;
1176	+	}
1177	+	else {
1178	+	const unsigned long lmask = (1L << (offset * 8)) - 1;
1179	+	value = regs[reg] & lmask;
1180	+	}
1181	+	// restore most significant bits
1182	+	if (transfer_size == SIZE_LONG)
1183	+	value = (signed long)(signed int)value;
1184	+	regs[reg] = value;
1185	+	}
1186	+	}
1187	+
1188	+	#if DEBUG
1189	+	#if (defined(_ABIN32) \|\| defined(_ABI64))
1190	+	static const char * mips_gpr_names[32] = {
1191	+	"zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
1192	+	"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
1193	+	"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
1194	+	"t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra"
1195	+	};
1196	+	#else
1197	+	static const char * mips_gpr_names[32] = {
1198	+	"zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
1199	+	"a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3",
1200	+	"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
1201	+	"t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra"
1202	+	};
1203	+	#endif
1204	+	printf("%s %s register %s\n",
1205	+	transfer_size == SIZE_BYTE ? "byte" :
1206	+	transfer_size == SIZE_WORD ? "word" :
1207	+	transfer_size == SIZE_LONG ? "long" :
1208	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1209	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1210	+	mips_gpr_names[reg]);
1211	+	#endif
1212	+
1213	+	regs[MIPS_REG_EPC] += 4;
1214	+	return true;
1215	+	}
1216	+	#endif
1217	+
1218	+	// Decode and skip SPARC instruction
1219	+	#if (defined(sparc) \|\| defined(__sparc__))
1220	+	enum {
1221	+	#if (defined(__sun__))
1222	+	SPARC_REG_G1 = REG_G1,
1223	+	SPARC_REG_O0 = REG_O0,
1224	+	SPARC_REG_PC = REG_PC,
1225	+	#endif
1226	+	};
1227	+	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
1228	+	{
1229	+	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
1230	+
1231	+	if (pc == 0)
1232	+	return false;
1233	+
1234	+	#if DEBUG
1235	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1236	+	#endif
1237	+
1238	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1239	+	transfer_size_t transfer_size = SIZE_LONG;
1240	+	bool register_pair = false;
1241	+
1242	+	const unsigned int opcode = pc[0];
1243	+	if ((opcode >> 30) != 3)
1244	+	return false;
1245	+	switch ((opcode >> 19) & 0x3f) {
1246	+	case 9: // Load Signed Byte
1247	+	case 1: // Load Unsigned Byte
1248	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1249	+	transfer_size = SIZE_BYTE;
1250	+	break;
1251	+	case 10:// Load Signed Halfword
1252	+	case 2: // Load Unsigned Word
1253	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1254	+	transfer_size = SIZE_WORD;
1255	+	break;
1256	+	case 8: // Load Word
1257	+	case 0: // Load Unsigned Word
1258	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1259	+	transfer_size = SIZE_LONG;
1260	+	break;
1261	+	case 11:// Load Extended Word
1262	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1263	+	transfer_size = SIZE_QUAD;
1264	+	break;
1265	+	case 3: // Load Doubleword
1266	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1267	+	transfer_size = SIZE_LONG;
1268	+	register_pair = true;
1269	+	break;
1270	+	case 5: // Store Byte
1271	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1272	+	transfer_size = SIZE_BYTE;
1273	+	break;
1274	+	case 6: // Store Halfword
1275	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1276	+	transfer_size = SIZE_WORD;
1277	+	break;
1278	+	case 4: // Store Word
1279	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1280	+	transfer_size = SIZE_LONG;
1281	+	break;
1282	+	case 14:// Store Extended Word
1283	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1284	+	transfer_size = SIZE_QUAD;
1285	+	break;
1286	+	case 7: // Store Doubleword
1287	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1288	+	transfer_size = SIZE_WORD;
1289	+	register_pair = true;
1290	+	break;
1291	+	}
1292	+
1293	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1294	+	// Unknown machine code, let it crash. Then patch the decoder
1295	+	return false;
1296	+	}
1297	+
1298	+	// Zero target register in case of a load operation
1299	+	const int reg = (opcode >> 25) & 0x1f;
1300	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
1301	+	// FIXME: code to handle local & input registers is not tested
1302	+	if (reg >= 1 && reg <= 7) {
1303	+	// global registers
1304	+	regs[reg - 1 + SPARC_REG_G1] = 0;
1305	+	}
1306	+	else if (reg >= 8 && reg <= 15) {
1307	+	// output registers
1308	+	regs[reg - 8 + SPARC_REG_O0] = 0;
1309	+	}
1310	+	else if (reg >= 16 && reg <= 23) {
1311	+	// local registers (in register windows)
1312	+	if (gwins)
1313	+	gwins->wbuf->rw_local[reg - 16] = 0;
1314	+	else
1315	+	rwin->rw_local[reg - 16] = 0;
1316	+	}
1317	+	else {
1318	+	// input registers (in register windows)
1319	+	if (gwins)
1320	+	gwins->wbuf->rw_in[reg - 24] = 0;
1321	+	else
1322	+	rwin->rw_in[reg - 24] = 0;
1323	+	}
1324	+	}
1325	+
1326	+	#if DEBUG
1327	+	static const char * reg_names[] = {
1328	+	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
1329	+	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
1330	+	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
1331	+	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
1332	+	};
1333	+	printf("%s %s register %s\n",
1334	+	transfer_size == SIZE_BYTE ? "byte" :
1335	+	transfer_size == SIZE_WORD ? "word" :
1336	+	transfer_size == SIZE_LONG ? "long" :
1337	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1338	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1339	+	reg_names[reg]);
1340	+	#endif
1341	+
1342	+	regs[SPARC_REG_PC] += 4;
1343	+	return true;
1344	+	}
1345	+	#endif
1346	+	#endif
1347	+
1348	+	// Decode and skip ARM instruction
1349	+	#if (defined(arm) \|\| defined(__arm__))
1350	+	enum {
1351	+	#if (defined(__linux__))
1352	+	ARM_REG_PC = 15,
1353	+	ARM_REG_CPSR = 16
1354		#endif
1355	+	};
1356	+	static bool arm_skip_instruction(unsigned long * regs)
1357	+	{
1358	+	unsigned int * pc = (unsigned int *)regs[ARM_REG_PC];
1359	+
1360	+	if (pc == 0)
1361	+	return false;
1362	+
1363	+	#if DEBUG
1364	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1365	+	#endif
1366	+
1367	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1368	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
1369	+	enum { op_sdt = 1, op_sdth = 2 };
1370	+	int op = 0;
1371	+
1372	+	// Handle load/store instructions only
1373	+	const unsigned int opcode = pc[0];
1374	+	switch ((opcode >> 25) & 7) {
1375	+	case 0: // Halfword and Signed Data Transfer (LDRH, STRH, LDRSB, LDRSH)
1376	+	op = op_sdth;
1377	+	// Determine transfer size (S/H bits)
1378	+	switch ((opcode >> 5) & 3) {
1379	+	case 0: // SWP instruction
1380	+	break;
1381	+	case 1: // Unsigned halfwords
1382	+	case 3: // Signed halfwords
1383	+	transfer_size = SIZE_WORD;
1384	+	break;
1385	+	case 2: // Signed byte
1386	+	transfer_size = SIZE_BYTE;
1387	+	break;
1388	+	}
1389	+	break;
1390	+	case 2:
1391	+	case 3: // Single Data Transfer (LDR, STR)
1392	+	op = op_sdt;
1393	+	// Determine transfer size (B bit)
1394	+	if (((opcode >> 22) & 1) == 1)
1395	+	transfer_size = SIZE_BYTE;
1396	+	else
1397	+	transfer_size = SIZE_LONG;
1398	+	break;
1399	+	default:
1400	+	// FIXME: support load/store mutliple?
1401	+	return false;
1402	+	}
1403	+
1404	+	// Check for invalid transfer size (SWP instruction?)
1405	+	if (transfer_size == SIZE_UNKNOWN)
1406	+	return false;
1407	+
1408	+	// Determine transfer type (L bit)
1409	+	if (((opcode >> 20) & 1) == 1)
1410	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1411	+	else
1412	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1413	+
1414	+	// Compute offset
1415	+	int offset;
1416	+	if (((opcode >> 25) & 1) == 0) {
1417	+	if (op == op_sdt)
1418	+	offset = opcode & 0xfff;
1419	+	else if (op == op_sdth) {
1420	+	int rm = opcode & 0xf;
1421	+	if (((opcode >> 22) & 1) == 0) {
1422	+	// register offset
1423	+	offset = regs[rm];
1424	+	}
1425	+	else {
1426	+	// immediate offset
1427	+	offset = ((opcode >> 4) & 0xf0) \| (opcode & 0x0f);
1428	+	}
1429	+	}
1430	+	}
1431	+	else {
1432	+	const int rm = opcode & 0xf;
1433	+	const int sh = (opcode >> 7) & 0x1f;
1434	+	if (((opcode >> 4) & 1) == 1) {
1435	+	// we expect only legal load/store instructions
1436	+	printf("FATAL: invalid shift operand\n");
1437	+	return false;
1438	+	}
1439	+	const unsigned int v = regs[rm];
1440	+	switch ((opcode >> 5) & 3) {
1441	+	case 0: // logical shift left
1442	+	offset = sh ? v << sh : v;
1443	+	break;
1444	+	case 1: // logical shift right
1445	+	offset = sh ? v >> sh : 0;
1446	+	break;
1447	+	case 2: // arithmetic shift right
1448	+	if (sh)
1449	+	offset = ((signed int)v) >> sh;
1450	+	else
1451	+	offset = (v & 0x80000000) ? 0xffffffff : 0;
1452	+	break;
1453	+	case 3: // rotate right
1454	+	if (sh)
1455	+	offset = (v >> sh) \| (v << (32 - sh));
1456	+	else
1457	+	offset = (v >> 1) \| ((regs[ARM_REG_CPSR] << 2) & 0x80000000);
1458	+	break;
1459	+	}
1460	+	}
1461	+	if (((opcode >> 23) & 1) == 0)
1462	+	offset = -offset;
1463	+
1464	+	int rd = (opcode >> 12) & 0xf;
1465	+	int rn = (opcode >> 16) & 0xf;
1466	+	#if DEBUG
1467	+	static const char * reg_names[] = {
1468	+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1469	+	"r9", "r9", "sl", "fp", "ip", "sp", "lr", "pc"
1470	+	};
1471	+	printf("%s %s register %s\n",
1472	+	transfer_size == SIZE_BYTE ? "byte" :
1473	+	transfer_size == SIZE_WORD ? "word" :
1474	+	transfer_size == SIZE_LONG ? "long" : "unknown",
1475	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1476	+	reg_names[rd]);
1477	+	#endif
1478	+
1479	+	unsigned int base = regs[rn];
1480	+	if (((opcode >> 24) & 1) == 1)
1481	+	base += offset;
1482	+
1483	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD)
1484	+	regs[rd] = 0;
1485	+
1486	+	if (((opcode >> 24) & 1) == 0) // post-index addressing
1487	+	regs[rn] += offset;
1488	+	else if (((opcode >> 21) & 1) == 1) // write-back address into base
1489	+	regs[rn] = base;
1490	+
1491	+	regs[ARM_REG_PC] += 4;
1492	+	return true;
1493	+	}
1494	+	#endif
1495	+
1496
1497		// Fallbacks
1498		#ifndef SIGSEGV_FAULT_INSTRUCTION
1499		#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_INVALID_PC
1500		#endif
1501	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
1502	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
1503	+	#endif
1504	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
1505	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP) sigsegv_fault_handler(ADDR, IP)
1506	+	#endif
1507
1508		// SIGSEGV recovery supported ?
1509		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 629 \| Line 1515 \| static bool powerpc_skip_instruction(uns
1515		* SIGSEGV global handler
1516		*/
1517
1518	<	#ifdef HAVE_SIGSEGV_RECOVERY
1519	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1518	>	// This function handles the badaccess to memory.
1519	>	// It is called from the signal handler or the exception handler.
1520	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
1521		{
1522		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
1523		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
637	–	bool fault_recovered = false;
1524
1525		// Call user's handler and reinstall the global handler, if required
1526	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
1527	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1528	<	sigsegv_do_install_handler(sig);
1526	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
1527	>	case SIGSEGV_RETURN_SUCCESS:
1528	>	return true;
1529	>
1530	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1531	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
1532	>	// Call the instruction skipper with the register file
1533	>	// available
1534	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
1535	>	#ifdef HAVE_MACH_EXCEPTIONS
1536	>	// Unlike UNIX signals where the thread state
1537	>	// is modified off of the stack, in Mach we
1538	>	// need to actually call thread_set_state to
1539	>	// have the register values updated.
1540	>	kern_return_t krc;
1541	>
1542	>	krc = thread_set_state(thread,
1543	>	MACHINE_THREAD_STATE, (thread_state_t)state,
1544	>	MACHINE_THREAD_STATE_COUNT);
1545	>	MACH_CHECK_ERROR (thread_get_state, krc);
1546		#endif
1547	<	fault_recovered = true;
1547	>	return true;
1548	>	}
1549	>	break;
1550	>	#endif
1551	>	case SIGSEGV_RETURN_FAILURE:
1552	>	// We can't do anything with the fault_address, dump state?
1553	>	if (sigsegv_state_dumper != 0)
1554	>	sigsegv_state_dumper(fault_address, fault_instruction);
1555	>	break;
1556		}
1557	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1558	<	else if (sigsegv_ignore_fault) {
1559	<	// Call the instruction skipper with the register file available
1560	<	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
1561	<	fault_recovered = true;
1557	>
1558	>	return false;
1559	>	}
1560	>
1561	>
1562	>	/*
1563	>	* There are two mechanisms for handling a bad memory access,
1564	>	* Mach exceptions and UNIX signals. The implementation specific
1565	>	* code appears below. Its reponsibility is to call handle_badaccess
1566	>	* which is the routine that handles the fault in an implementation
1567	>	* agnostic manner. The implementation specific code below is then
1568	>	* reponsible for checking whether handle_badaccess was able
1569	>	* to handle the memory access error and perform any implementation
1570	>	* specific tasks necessary afterwards.
1571	>	*/
1572	>
1573	>	#ifdef HAVE_MACH_EXCEPTIONS
1574	>	/*
1575	>	* We need to forward all exceptions that we do not handle.
1576	>	* This is important, there are many exceptions that may be
1577	>	* handled by other exception handlers. For example debuggers
1578	>	* use exceptions and the exception hander is in another
1579	>	* process in such a case. (Timothy J. Wood states in his
1580	>	* message to the list that he based this code on that from
1581	>	* gdb for Darwin.)
1582	>	*/
1583	>	static inline kern_return_t
1584	>	forward_exception(mach_port_t thread_port,
1585	>	mach_port_t task_port,
1586	>	exception_type_t exception_type,
1587	>	exception_data_t exception_data,
1588	>	mach_msg_type_number_t data_count,
1589	>	ExceptionPorts *oldExceptionPorts)
1590	>	{
1591	>	kern_return_t kret;
1592	>	unsigned int portIndex;
1593	>	mach_port_t port;
1594	>	exception_behavior_t behavior;
1595	>	thread_state_flavor_t flavor;
1596	>	thread_state_t thread_state;
1597	>	mach_msg_type_number_t thread_state_count;
1598	>
1599	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1600	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1601	>	// This handler wants the exception
1602	>	break;
1603	>	}
1604	>	}
1605	>
1606	>	if (portIndex >= oldExceptionPorts->maskCount) {
1607	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1608	>	return KERN_FAILURE;
1609	>	}
1610	>
1611	>	port = oldExceptionPorts->handlers[portIndex];
1612	>	behavior = oldExceptionPorts->behaviors[portIndex];
1613	>	flavor = oldExceptionPorts->flavors[portIndex];
1614	>
1615	>	/*
1616	>	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1617	>	*/
1618	>
1619	>	if (behavior != EXCEPTION_DEFAULT) {
1620	>	thread_state_count = THREAD_STATE_MAX;
1621	>	kret = thread_get_state (thread_port, flavor, thread_state,
1622	>	&thread_state_count);
1623	>	MACH_CHECK_ERROR (thread_get_state, kret);
1624	>	}
1625	>
1626	>	switch (behavior) {
1627	>	case EXCEPTION_DEFAULT:
1628	>	// fprintf(stderr, "forwarding to exception_raise\n");
1629	>	kret = exception_raise(port, thread_port, task_port, exception_type,
1630	>	exception_data, data_count);
1631	>	MACH_CHECK_ERROR (exception_raise, kret);
1632	>	break;
1633	>	case EXCEPTION_STATE:
1634	>	// fprintf(stderr, "forwarding to exception_raise_state\n");
1635	>	kret = exception_raise_state(port, exception_type, exception_data,
1636	>	data_count, &flavor,
1637	>	thread_state, thread_state_count,
1638	>	thread_state, &thread_state_count);
1639	>	MACH_CHECK_ERROR (exception_raise_state, kret);
1640	>	break;
1641	>	case EXCEPTION_STATE_IDENTITY:
1642	>	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1643	>	kret = exception_raise_state_identity(port, thread_port, task_port,
1644	>	exception_type, exception_data,
1645	>	data_count, &flavor,
1646	>	thread_state, thread_state_count,
1647	>	thread_state, &thread_state_count);
1648	>	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1649	>	break;
1650	>	default:
1651	>	fprintf(stderr, "forward_exception got unknown behavior\n");
1652	>	break;
1653	>	}
1654	>
1655	>	if (behavior != EXCEPTION_DEFAULT) {
1656	>	kret = thread_set_state (thread_port, flavor, thread_state,
1657	>	thread_state_count);
1658	>	MACH_CHECK_ERROR (thread_set_state, kret);
1659		}
1660	+
1661	+	return KERN_SUCCESS;
1662	+	}
1663	+
1664	+	/*
1665	+	* This is the code that actually handles the exception.
1666	+	* It is called by exc_server. For Darwin 5 Apple changed
1667	+	* this a bit from how this family of functions worked in
1668	+	* Mach. If you are familiar with that it is a little
1669	+	* different. The main variation that concerns us here is
1670	+	* that code is an array of exception specific codes and
1671	+	* codeCount is a count of the number of codes in the code
1672	+	* array. In typical Mach all exceptions have a code
1673	+	* and sub-code. It happens to be the case that for a
1674	+	* EXC_BAD_ACCESS exception the first entry is the type of
1675	+	* bad access that occurred and the second entry is the
1676	+	* faulting address so these entries correspond exactly to
1677	+	* how the code and sub-code are used on Mach.
1678	+	*
1679	+	* This is a MIG interface. No code in Basilisk II should
1680	+	* call this directley. This has to have external C
1681	+	* linkage because that is what exc_server expects.
1682	+	*/
1683	+	kern_return_t
1684	+	catch_exception_raise(mach_port_t exception_port,
1685	+	mach_port_t thread,
1686	+	mach_port_t task,
1687	+	exception_type_t exception,
1688	+	exception_data_t code,
1689	+	mach_msg_type_number_t codeCount)
1690	+	{
1691	+	ppc_thread_state_t state;
1692	+	kern_return_t krc;
1693	+
1694	+	if ((exception == EXC_BAD_ACCESS) && (codeCount >= 2)) {
1695	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1696	+	return KERN_SUCCESS;
1697	+	}
1698	+
1699	+	// In Mach we do not need to remove the exception handler.
1700	+	// If we forward the exception, eventually some exception handler
1701	+	// will take care of this exception.
1702	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1703	+
1704	+	return krc;
1705	+	}
1706	+	#endif
1707	+
1708	+	#ifdef HAVE_SIGSEGV_RECOVERY
1709	+	// Handle bad memory accesses with signal handler
1710	+	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1711	+	{
1712	+	// Call handler and reinstall the global handler, if required
1713	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1714	+	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1715	+	sigsegv_do_install_handler(sig);
1716		#endif
1717	+	return;
1718	+	}
1719
1720	<	if (!fault_recovered) {
655	<	// FAIL: reinstall default handler for "safe" crash
1720	>	// Failure: reinstall default handler for "safe" crash
1721		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1722	<	SIGSEGV_ALL_SIGNALS
1722	>	SIGSEGV_ALL_SIGNALS
1723		#undef FAULT_HANDLER
659	–
660	–	// We can't do anything with the fault_address, dump state?
661	–	if (sigsegv_state_dumper != 0)
662	–	sigsegv_state_dumper(fault_address, fault_instruction);
663	–	}
1724		}
1725		#endif
1726
#	Line 674 \| Line 1734 \| static bool sigsegv_do_install_handler(i
1734		{
1735		// Setup SIGSEGV handler to process writes to frame buffer
1736		#ifdef HAVE_SIGACTION
1737	<	struct sigaction vosf_sa;
1738	<	sigemptyset(&vosf_sa.sa_mask);
1739	<	vosf_sa.sa_sigaction = sigsegv_handler;
1740	<	vosf_sa.sa_flags = SA_SIGINFO;
1741	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1737	>	struct sigaction sigsegv_sa;
1738	>	sigemptyset(&sigsegv_sa.sa_mask);
1739	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1740	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1741	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1742		#else
1743		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1744		#endif
#	Line 690 \| Line 1750 \| static bool sigsegv_do_install_handler(i
1750		{
1751		// Setup SIGSEGV handler to process writes to frame buffer
1752		#ifdef HAVE_SIGACTION
1753	<	struct sigaction vosf_sa;
1754	<	sigemptyset(&vosf_sa.sa_mask);
1755	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1753	>	struct sigaction sigsegv_sa;
1754	>	sigemptyset(&sigsegv_sa.sa_mask);
1755	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1756	>	sigsegv_sa.sa_flags = 0;
1757		#if !EMULATED_68K && defined(__NetBSD__)
1758	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1759	<	vosf_sa.sa_flags = SA_ONSTACK;
699	<	#else
700	<	vosf_sa.sa_flags = 0;
1758	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1759	>	sigsegv_sa.sa_flags \|= SA_ONSTACK;
1760		#endif
1761	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1761	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1762		#else
1763		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1764		#endif
1765		}
1766		#endif
1767
1768	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1768	>	#if defined(HAVE_MACH_EXCEPTIONS)
1769	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1770		{
1771	<	#ifdef HAVE_SIGSEGV_RECOVERY
1771	>	/*
1772	>	* Except for the exception port functions, this should be
1773	>	* pretty much stock Mach. If later you choose to support
1774	>	* other Mach's besides Darwin, just check for __MACH__
1775	>	* here and __APPLE__ where the actual differences are.
1776	>	*/
1777	>	#if defined(__APPLE__) && defined(__MACH__)
1778	>	if (sigsegv_fault_handler != NULL) {
1779	>	sigsegv_fault_handler = handler;
1780	>	return true;
1781	>	}
1782	>
1783	>	kern_return_t krc;
1784	>
1785	>	// create the the exception port
1786	>	krc = mach_port_allocate(mach_task_self(),
1787	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1788	>	if (krc != KERN_SUCCESS) {
1789	>	mach_error("mach_port_allocate", krc);
1790	>	return false;
1791	>	}
1792	>
1793	>	// add a port send right
1794	>	krc = mach_port_insert_right(mach_task_self(),
1795	>	_exceptionPort, _exceptionPort,
1796	>	MACH_MSG_TYPE_MAKE_SEND);
1797	>	if (krc != KERN_SUCCESS) {
1798	>	mach_error("mach_port_insert_right", krc);
1799	>	return false;
1800	>	}
1801	>
1802	>	// get the old exception ports
1803	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1804	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1805	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1806	>	if (krc != KERN_SUCCESS) {
1807	>	mach_error("thread_get_exception_ports", krc);
1808	>	return false;
1809	>	}
1810	>
1811	>	// set the new exception port
1812	>	//
1813	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1814	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1815	>	// message, but it turns out that in the common case this is not
1816	>	// neccessary. If we need it we can later ask for it from the
1817	>	// suspended thread.
1818	>	//
1819	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1820	>	// counter in the thread state. The comments in the header file
1821	>	// seem to imply that you can count on the GPR's on an exception
1822	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1823	>	// you have to ask for all of the GPR's anyway just to get the
1824	>	// program counter. In any case because of update effective
1825	>	// address from immediate and update address from effective
1826	>	// addresses of ra and rb modes (as good an name as any for these
1827	>	// addressing modes) used in PPC instructions, you will need the
1828	>	// GPR state anyway.
1829	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1830	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1831	>	if (krc != KERN_SUCCESS) {
1832	>	mach_error("thread_set_exception_ports", krc);
1833	>	return false;
1834	>	}
1835	>
1836	>	// create the exception handler thread
1837	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1838	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1839	>	return false;
1840	>	}
1841	>
1842	>	// do not care about the exception thread any longer, let is run standalone
1843	>	(void)pthread_detach(exc_thread);
1844	>
1845		sigsegv_fault_handler = handler;
1846	+	return true;
1847	+	#else
1848	+	return false;
1849	+	#endif
1850	+	}
1851	+	#endif
1852	+
1853	+	#ifdef HAVE_WIN32_EXCEPTIONS
1854	+	static LONG WINAPI main_exception_filter(EXCEPTION_POINTERS *ExceptionInfo)
1855	+	{
1856	+	if (sigsegv_fault_handler != NULL
1857	+	&& ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
1858	+	&& ExceptionInfo->ExceptionRecord->NumberParameters == 2
1859	+	&& handle_badaccess(ExceptionInfo))
1860	+	return EXCEPTION_CONTINUE_EXECUTION;
1861	+
1862	+	return EXCEPTION_CONTINUE_SEARCH;
1863	+	}
1864	+
1865	+	#if defined __CYGWIN__ && defined __i386__
1866	+	/* In Cygwin programs, SetUnhandledExceptionFilter has no effect because Cygwin
1867	+	installs a global exception handler. We have to dig deep in order to install
1868	+	our main_exception_filter. */
1869	+
1870	+	/* Data structures for the current thread's exception handler chain.
1871	+	On the x86 Windows uses register fs, offset 0 to point to the current
1872	+	exception handler; Cygwin mucks with it, so we must do the same... :-/ */
1873	+
1874	+	/* Magic taken from winsup/cygwin/include/exceptions.h. */
1875	+
1876	+	struct exception_list {
1877	+	struct exception_list *prev;
1878	+	int (handler) (EXCEPTION_RECORD , void , CONTEXT , void *);
1879	+	};
1880	+	typedef struct exception_list exception_list;
1881	+
1882	+	/* Magic taken from winsup/cygwin/exceptions.cc. */
1883	+
1884	+	__asm__ (".equ __except_list,0");
1885	+
1886	+	extern exception_list *_except_list __asm__ ("%fs:__except_list");
1887	+
1888	+	/* For debugging. _except_list is not otherwise accessible from gdb. */
1889	+	static exception_list *
1890	+	debug_get_except_list ()
1891	+	{
1892	+	return _except_list;
1893	+	}
1894	+
1895	+	/* Cygwin's original exception handler. */
1896	+	static int (cygwin_exception_handler) (EXCEPTION_RECORD , void , CONTEXT , void *);
1897	+
1898	+	/* Our exception handler. */
1899	+	static int
1900	+	libsigsegv_exception_handler (EXCEPTION_RECORD exception, void frame, CONTEXT context, void dispatch)
1901	+	{
1902	+	EXCEPTION_POINTERS ExceptionInfo;
1903	+	ExceptionInfo.ExceptionRecord = exception;
1904	+	ExceptionInfo.ContextRecord = context;
1905	+	if (main_exception_filter (&ExceptionInfo) == EXCEPTION_CONTINUE_SEARCH)
1906	+	return cygwin_exception_handler (exception, frame, context, dispatch);
1907	+	else
1908	+	return 0;
1909	+	}
1910	+
1911	+	static void
1912	+	do_install_main_exception_filter ()
1913	+	{
1914	+	/* We cannot insert any handler into the chain, because such handlers
1915	+	must lie on the stack (?). Instead, we have to replace(!) Cygwin's
1916	+	global exception handler. */
1917	+	cygwin_exception_handler = _except_list->handler;
1918	+	_except_list->handler = libsigsegv_exception_handler;
1919	+	}
1920	+
1921	+	#else
1922	+
1923	+	static void
1924	+	do_install_main_exception_filter ()
1925	+	{
1926	+	SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) &main_exception_filter);
1927	+	}
1928	+	#endif
1929	+
1930	+	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1931	+	{
1932	+	static bool main_exception_filter_installed = false;
1933	+	if (!main_exception_filter_installed) {
1934	+	do_install_main_exception_filter();
1935	+	main_exception_filter_installed = true;
1936	+	}
1937	+	sigsegv_fault_handler = handler;
1938	+	return true;
1939	+	}
1940	+	#endif
1941	+
1942	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1943	+	{
1944	+	#if defined(HAVE_SIGSEGV_RECOVERY)
1945		bool success = true;
1946		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1947		SIGSEGV_ALL_SIGNALS
1948		#undef FAULT_HANDLER
1949	+	if (success)
1950	+	sigsegv_fault_handler = handler;
1951		return success;
1952	+	#elif defined(HAVE_MACH_EXCEPTIONS) \|\| defined(HAVE_WIN32_EXCEPTIONS)
1953	+	return sigsegv_do_install_handler(handler);
1954		#else
1955		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1956		return false;
#	Line 728 \| Line 1964 \| bool sigsegv_install_handler(sigsegv_fau
1964
1965		void sigsegv_deinstall_handler(void)
1966		{
1967	+	// We do nothing for Mach exceptions, the thread would need to be
1968	+	// suspended if not already so, and we might mess with other
1969	+	// exception handlers that came after we registered ours. There is
1970	+	// no need to remove the exception handler, in fact this function is
1971	+	// not called anywhere in Basilisk II.
1972		#ifdef HAVE_SIGSEGV_RECOVERY
1973		sigsegv_fault_handler = 0;
1974		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1975		SIGSEGV_ALL_SIGNALS
1976		#undef FAULT_HANDLER
1977		#endif
1978	<	}
1979	<
1980	<
740	<	/*
741	<	* SIGSEGV ignore state modifier
742	<	*/
743	<
744	<	void sigsegv_set_ignore_state(bool ignore_fault)
745	<	{
746	<	sigsegv_ignore_fault = ignore_fault;
1978	>	#ifdef HAVE_WIN32_EXCEPTIONS
1979	>	sigsegv_fault_handler = NULL;
1980	>	#endif
1981		}
1982
1983
#	Line 765 \| Line 1999 \| void sigsegv_set_dump_state(sigsegv_stat
1999		#include <stdio.h>
2000		#include <stdlib.h>
2001		#include <fcntl.h>
2002	+	#ifdef HAVE_SYS_MMAN_H
2003		#include <sys/mman.h>
2004	+	#endif
2005		#include "vm_alloc.h"
2006
2007	+	const int REF_INDEX = 123;
2008	+	const int REF_VALUE = 45;
2009	+
2010		static int page_size;
2011		static volatile char * page = 0;
2012		static volatile int handler_called = 0;
2013
2014	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2014	>	#ifdef __GNUC__
2015	>	// Code range where we expect the fault to come from
2016	>	static void b_region, e_region;
2017	>	#endif
2018	>
2019	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2020		{
2021	+	#if DEBUG
2022	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
2023	+	printf("expected fault at %p\n", page + REF_INDEX);
2024	+	#ifdef __GNUC__
2025	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
2026	+	#endif
2027	+	#endif
2028		handler_called++;
2029	<	if ((fault_address - 123) != page)
2030	<	exit(1);
2029	>	if ((fault_address - REF_INDEX) != page)
2030	>	exit(10);
2031	>	#ifdef __GNUC__
2032	>	// Make sure reported fault instruction address falls into
2033	>	// expected code range
2034	>	if (instruction_address != SIGSEGV_INVALID_PC
2035	>	&& ((instruction_address < (sigsegv_address_t)b_region) \|\|
2036	>	(instruction_address >= (sigsegv_address_t)e_region)))
2037	>	exit(11);
2038	>	#endif
2039		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ \| VM_PAGE_WRITE) != 0)
2040	<	exit(1);
2041	<	return true;
2040	>	exit(12);
2041	>	return SIGSEGV_RETURN_SUCCESS;
2042		}
2043
2044		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2045	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2045	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2046		{
2047	<	return false;
2047	>	#if DEBUG
2048	>	printf("sigsegv_insn_handler(%p, %p)\n", fault_address, instruction_address);
2049	>	#endif
2050	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
2051	>	#ifdef __GNUC__
2052	>	// Make sure reported fault instruction address falls into
2053	>	// expected code range
2054	>	if (instruction_address != SIGSEGV_INVALID_PC
2055	>	&& ((instruction_address < (sigsegv_address_t)b_region) \|\|
2056	>	(instruction_address >= (sigsegv_address_t)e_region)))
2057	>	return SIGSEGV_RETURN_FAILURE;
2058	>	#endif
2059	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
2060	>	}
2061	>
2062	>	return SIGSEGV_RETURN_FAILURE;
2063	>	}
2064	>
2065	>	// More sophisticated tests for instruction skipper
2066	>	static bool arch_insn_skipper_tests()
2067	>	{
2068	>	#if (defined(i386) \|\| defined(__i386__)) \|\| defined(__x86_64__)
2069	>	static const unsigned char code[] = {
2070	>	0x8a, 0x00, // mov (%eax),%al
2071	>	0x8a, 0x2c, 0x18, // mov (%eax,%ebx,1),%ch
2072	>	0x88, 0x20, // mov %ah,(%eax)
2073	>	0x88, 0x08, // mov %cl,(%eax)
2074	>	0x66, 0x8b, 0x00, // mov (%eax),%ax
2075	>	0x66, 0x8b, 0x0c, 0x18, // mov (%eax,%ebx,1),%cx
2076	>	0x66, 0x89, 0x00, // mov %ax,(%eax)
2077	>	0x66, 0x89, 0x0c, 0x18, // mov %cx,(%eax,%ebx,1)
2078	>	0x8b, 0x00, // mov (%eax),%eax
2079	>	0x8b, 0x0c, 0x18, // mov (%eax,%ebx,1),%ecx
2080	>	0x89, 0x00, // mov %eax,(%eax)
2081	>	0x89, 0x0c, 0x18, // mov %ecx,(%eax,%ebx,1)
2082	>	#if defined(__x86_64__)
2083	>	0x44, 0x8a, 0x00, // mov (%rax),%r8b
2084	>	0x44, 0x8a, 0x20, // mov (%rax),%r12b
2085	>	0x42, 0x8a, 0x3c, 0x10, // mov (%rax,%r10,1),%dil
2086	>	0x44, 0x88, 0x00, // mov %r8b,(%rax)
2087	>	0x44, 0x88, 0x20, // mov %r12b,(%rax)
2088	>	0x42, 0x88, 0x3c, 0x10, // mov %dil,(%rax,%r10,1)
2089	>	0x66, 0x44, 0x8b, 0x00, // mov (%rax),%r8w
2090	>	0x66, 0x42, 0x8b, 0x0c, 0x10, // mov (%rax,%r10,1),%cx
2091	>	0x66, 0x44, 0x89, 0x00, // mov %r8w,(%rax)
2092	>	0x66, 0x42, 0x89, 0x0c, 0x10, // mov %cx,(%rax,%r10,1)
2093	>	0x44, 0x8b, 0x00, // mov (%rax),%r8d
2094	>	0x42, 0x8b, 0x0c, 0x10, // mov (%rax,%r10,1),%ecx
2095	>	0x44, 0x89, 0x00, // mov %r8d,(%rax)
2096	>	0x42, 0x89, 0x0c, 0x10, // mov %ecx,(%rax,%r10,1)
2097	>	0x48, 0x8b, 0x08, // mov (%rax),%rcx
2098	>	0x4c, 0x8b, 0x18, // mov (%rax),%r11
2099	>	0x4a, 0x8b, 0x0c, 0x10, // mov (%rax,%r10,1),%rcx
2100	>	0x4e, 0x8b, 0x1c, 0x10, // mov (%rax,%r10,1),%r11
2101	>	0x48, 0x89, 0x08, // mov %rcx,(%rax)
2102	>	0x4c, 0x89, 0x18, // mov %r11,(%rax)
2103	>	0x4a, 0x89, 0x0c, 0x10, // mov %rcx,(%rax,%r10,1)
2104	>	0x4e, 0x89, 0x1c, 0x10, // mov %r11,(%rax,%r10,1)
2105	>	#endif
2106	>	0 // end
2107	>	};
2108	>	const int N_REGS = 20;
2109	>	unsigned long regs[N_REGS];
2110	>	for (int i = 0; i < N_REGS; i++)
2111	>	regs[i] = i;
2112	>	const unsigned long start_code = (unsigned long)&code;
2113	>	regs[X86_REG_EIP] = start_code;
2114	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
2115	>	&& ix86_skip_instruction(regs))
2116	>	; /* simply iterate */
2117	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
2118	>	#endif
2119	>	return true;
2120		}
2121		#endif
2122
#	Line 794 \| Line 2125 \| int main(void)
2125		if (vm_init() < 0)
2126		return 1;
2127
2128	+	#ifdef _WIN32
2129	+	page_size = 4096;
2130	+	#else
2131		page_size = getpagesize();
2132	+	#endif
2133		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
2134	<	return 1;
2134	>	return 2;
2135
2136	+	memset((void *)page, 0, page_size);
2137		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
2138	<	return 1;
2138	>	return 3;
2139
2140		if (!sigsegv_install_handler(sigsegv_test_handler))
2141	<	return 1;
806	<
807	<	page[123] = 45;
808	<	page[123] = 45;
2141	>	return 4;
2142
2143	+	#ifdef __GNUC__
2144	+	b_region = &&L_b_region1;
2145	+	e_region = &&L_e_region1;
2146	+	#endif
2147	+	L_b_region1:
2148	+	page[REF_INDEX] = REF_VALUE;
2149	+	if (page[REF_INDEX] != REF_VALUE)
2150	+	exit(20);
2151	+	page[REF_INDEX] = REF_VALUE;
2152	+	L_e_region1:
2153	+
2154		if (handler_called != 1)
2155	<	return 1;
2155	>	return 5;
2156
2157		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2158		if (!sigsegv_install_handler(sigsegv_insn_handler))
2159	<	return 1;
2159	>	return 6;
2160
2161		if (vm_protect((char *)page, page_size, VM_PAGE_READ \| VM_PAGE_WRITE) < 0)
2162	<	return 1;
2162	>	return 7;
2163
2164		for (int i = 0; i < page_size; i++)
2165		page[i] = (i + 1) % page_size;
2166
2167		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
2168	<	return 1;
2168	>	return 8;
2169
826	–	sigsegv_set_ignore_state(true);
827	–
2170		#define TEST_SKIP_INSTRUCTION(TYPE) do { \
2171	<	const unsigned int TAG = 0x12345678; \
2171	>	const unsigned long TAG = 0x12345678 \| \
2172	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0); \
2173		TYPE data = ((TYPE )(page + sizeof(TYPE))); \
2174	<	volatile unsigned int effect = data + TAG; \
2174	>	volatile unsigned long effect = data + TAG; \
2175		if (effect != TAG) \
2176	<	return 1; \
2176	>	return 9; \
2177		} while (0)
2178
2179	+	#ifdef __GNUC__
2180	+	b_region = &&L_b_region2;
2181	+	e_region = &&L_e_region2;
2182	+	#endif
2183	+	L_b_region2:
2184		TEST_SKIP_INSTRUCTION(unsigned char);
2185		TEST_SKIP_INSTRUCTION(unsigned short);
2186		TEST_SKIP_INSTRUCTION(unsigned int);
2187	+	TEST_SKIP_INSTRUCTION(unsigned long);
2188	+	TEST_SKIP_INSTRUCTION(signed char);
2189	+	TEST_SKIP_INSTRUCTION(signed short);
2190	+	TEST_SKIP_INSTRUCTION(signed int);
2191	+	TEST_SKIP_INSTRUCTION(signed long);
2192	+	L_e_region2:
2193	+
2194	+	if (!arch_insn_skipper_tests())
2195	+	return 20;
2196		#endif
2197
2198		vm_exit();

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Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents): Revision 1.21 by gbeauche, 2002-10-03T15:49:14Z vs. Revision 1.53 by gbeauche, 2005-02-20T11:39:12Z

Diff Legend

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.21 by gbeauche, 2002-10-03T15:49:14Z vs.
Revision 1.53 by gbeauche, 2005-02-20T11:39:12Z