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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.21 by gbeauche, 2002-10-03T15:49:14Z vs.
Revision 1.57 by gbeauche, 2006-01-22T00:05:05Z

#	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	>	#if defined(__i386__)
260	>	#include <sys/regset.h>
261	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
262	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[EIP]
263	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
264	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
265	>	#endif
266	>	#endif
267	>	#if defined(__FreeBSD__) || defined(__OpenBSD__)
268		#if (defined(i386) || defined(__i386__))
269		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
270	<	#define SIGSEGV_REGISTER_FILE                   ((unsigned int *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
270	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
271		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
272		#endif
273		#endif
274	+	#if defined(__NetBSD__)
275	+	#if (defined(i386) || defined(__i386__))
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_EIP]
279	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
280	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
281	+	#endif
282	+	#if (defined(powerpc) || defined(__powerpc__))
283	+	#include <sys/ucontext.h>
284	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.__gregs)
285	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[_REG_PC]
286	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS[_REG_PC], (unsigned long *)&SIGSEGV_CONTEXT_REGS[_REG_R0]
287	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
288	+	#endif
289	+	#endif
290		#if defined(__linux__)
291		#if (defined(i386) || defined(__i386__))
292		#include <sys/ucontext.h>
293		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
294		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
295	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)SIGSEGV_CONTEXT_REGS
295	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
296		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
297		#endif
298		#if (defined(x86_64) || defined(__x86_64__))
#	Line 235 | Line 300 | static void powerpc_decode_instruction(i
300		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
301		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
302		#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
303	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
304		#endif
305		#if (defined(ia64) || defined(__ia64__))
306		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
#	Line 243 | Line 309 | static void powerpc_decode_instruction(i
309		#include <sys/ucontext.h>
310		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
311		#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
312	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
312	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned long *)(SIGSEGV_CONTEXT_REGS->gpr)
313		#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
314		#endif
315	+	#if (defined(hppa) || defined(__hppa__))
316	+	#undef  SIGSEGV_FAULT_ADDRESS
317	+	#define SIGSEGV_FAULT_ADDRESS                   sip->si_ptr
318	+	#endif
319	+	#if (defined(arm) || defined(__arm__))
320	+	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
321	+	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
322	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.arm_pc)
323	+	#define SIGSEGV_REGISTER_FILE                   (&SIGSEGV_CONTEXT_REGS.arm_r0)
324	+	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
325	+	#endif
326		#endif
327		#endif
328
#	Line 256 | Line 333 | static void powerpc_decode_instruction(i
333		#if (defined(i386) || defined(__i386__))
334		#include <asm/sigcontext.h>
335		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
336	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
337	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
338	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)(&scs)
336	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
337	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
338	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
339	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
340	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
341		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
342		#endif
343		#if (defined(sparc) || defined(__sparc__))
344		#include <asm/sigcontext.h>
345		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
346	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
347		#define SIGSEGV_FAULT_ADDRESS                   addr
348		#endif
349		#if (defined(powerpc) || defined(__powerpc__))
350		#include <asm/sigcontext.h>
351		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
352	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
353		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
354		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
355	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
355	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&scp->regs->nip, (unsigned long *)(scp->regs->gpr)
356		#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
357		#endif
358		#if (defined(alpha) || defined(__alpha__))
359		#include <asm/sigcontext.h>
360		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
361	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
362		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
363		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
364	<
365	<	// From Boehm's GC 6.0alpha8
366	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
367	<	{
368	<	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
369	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
370	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
371	<	return (sigsegv_address_t)fault_address;
372	<	}
364	>	#endif
365	>	#if (defined(arm) || defined(__arm__))
366	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int r1, int r2, int r3, struct sigcontext sc
367	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
368	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &sc
369	>	#define SIGSEGV_FAULT_ADDRESS                   scp->fault_address
370	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->arm_pc
371	>	#define SIGSEGV_REGISTER_FILE                   &scp->arm_r0
372	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
373		#endif
374		#endif
375
376		// Irix 5 or 6 on MIPS
377	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
377	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
378		#include <ucontext.h>
379		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
380	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
380	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
381	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
382	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
383		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
384		#endif
385
386		// HP-UX
387		#if (defined(hpux) || defined(__hpux__))
388		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
389	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
390		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
391		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
392		#endif
#	Line 310 | Line 395 | static sigsegv_address_t get_fault_addre
395		#if defined(__osf__)
396		#include <ucontext.h>
397		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
398	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
399		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
400		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
401		#endif
#	Line 317 | Line 403 | static sigsegv_address_t get_fault_addre
403		// AIX
404		#if defined(_AIX)
405		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
406	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
407		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
408		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
409		#endif
410
411	<	// NetBSD or FreeBSD
412	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
411	>	// NetBSD
412	>	#if defined(__NetBSD__)
413		#if (defined(m68k) || defined(__m68k__))
414		#include <m68k/frame.h>
415		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
416	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
417		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
418		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
419
#	Line 349 | Line 437 | static sigsegv_address_t get_fault_addre
437		}
438		return (sigsegv_address_t)fault_addr;
439		}
440	<	#else
441	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
442	<	#define SIGSEGV_FAULT_ADDRESS                   addr
440	>	#endif
441	>	#if (defined(alpha) || defined(__alpha__))
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_FAULT_ADDRESS                   get_fault_address(scp)
445		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
446		#endif
447	+	#if (defined(i386) || defined(__i386__))
448	+	#error "FIXME: need to decode instruction and compute EA"
449	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
450	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
451	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
452		#endif
453	+	#endif
454	+	#if defined(__FreeBSD__)
455	+	#if (defined(i386) || defined(__i386__))
456	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
457	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
458	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
459	+	#define SIGSEGV_FAULT_ADDRESS                   addr
460	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
461	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
462	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
463	+	#endif
464	+	#if (defined(alpha) || defined(__alpha__))
465	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
466	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, char *addr, struct sigcontext *scp
467	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, addr, scp
468	+	#define SIGSEGV_FAULT_ADDRESS                   addr
469	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
470	+	#endif
471	+	#endif
472	+
473	+	// Extract fault address out of a sigcontext
474	+	#if (defined(alpha) || defined(__alpha__))
475	+	// From Boehm's GC 6.0alpha8
476	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
477	+	{
478	+	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
479	+	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
480	+	fault_address += (signed long)(signed short)(instruction & 0xffff);
481	+	return (sigsegv_address_t)fault_address;
482	+	}
483	+	#endif
484	+
485
486	<	// MacOS X
486	>	// MacOS X, not sure which version this works in. Under 10.1
487	>	// vm_protect does not appear to work from a signal handler. Under
488	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
489	>	// field is the address of the faulting instruction and not the
490	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
491	>	// case with Mach exception handlers there is a way to do what this
492	>	// was meant to do.
493	>	#ifndef HAVE_MACH_EXCEPTIONS
494		#if defined(__APPLE__) && defined(__MACH__)
495		#if (defined(ppc) || defined(__ppc__))
496		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
497	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
498		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
499		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
500		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
#	Line 379 | Line 514 | static sigsegv_address_t get_fault_addre
514		#endif
515		#endif
516		#endif
517	+	#endif
518	+
519	+	#if HAVE_WIN32_EXCEPTIONS
520	+	#define WIN32_LEAN_AND_MEAN /* avoid including junk */
521	+	#include <windows.h>
522	+	#include <winerror.h>
523	+
524	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   EXCEPTION_POINTERS *ExceptionInfo
525	+	#define SIGSEGV_FAULT_HANDLER_ARGS              ExceptionInfo
526	+	#define SIGSEGV_FAULT_ADDRESS                   ExceptionInfo->ExceptionRecord->ExceptionInformation[1]
527	+	#define SIGSEGV_CONTEXT_REGS                    ExceptionInfo->ContextRecord
528	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS->Eip
529	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&SIGSEGV_CONTEXT_REGS->Edi)
530	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
531	+	#endif
532	+
533	+	#if HAVE_MACH_EXCEPTIONS
534	+
535	+	// This can easily be extended to other Mach systems, but really who
536	+	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
537	+	// Mach 2.5/3.0?
538	+	#if defined(__APPLE__) && defined(__MACH__)
539	+
540	+	#include <sys/types.h>
541	+	#include <stdlib.h>
542	+	#include <stdio.h>
543	+	#include <pthread.h>
544	+
545	+	/*
546	+	* If you are familiar with MIG then you will understand the frustration
547	+	* that was necessary to get these embedded into C++ code by hand.
548	+	*/
549	+	extern "C" {
550	+	#include <mach/mach.h>
551	+	#include <mach/mach_error.h>
552	+
553	+	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
554	+	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
555	+	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
556	+	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
557	+	exception_type_t, exception_data_t, mach_msg_type_number_t);
558	+	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
559	+	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
560	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
561	+	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
562	+	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
563	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
564	+	}
565	+
566	+	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
567	+	#define HANDLER_COUNT 64
568	+
569	+	// structure to tuck away existing exception handlers
570	+	typedef struct _ExceptionPorts {
571	+	mach_msg_type_number_t maskCount;
572	+	exception_mask_t masks[HANDLER_COUNT];
573	+	exception_handler_t handlers[HANDLER_COUNT];
574	+	exception_behavior_t behaviors[HANDLER_COUNT];
575	+	thread_state_flavor_t flavors[HANDLER_COUNT];
576	+	} ExceptionPorts;
577	+
578	+	// exception handler thread
579	+	static pthread_t exc_thread;
580	+
581	+	// place where old exception handler info is stored
582	+	static ExceptionPorts ports;
583	+
584	+	// our exception port
585	+	static mach_port_t _exceptionPort = MACH_PORT_NULL;
586	+
587	+	#define MACH_CHECK_ERROR(name,ret) \
588	+	if (ret != KERN_SUCCESS) { \
589	+	mach_error(#name, ret); \
590	+	exit (1); \
591	+	}
592	+
593	+	#ifdef __ppc__
594	+	#define SIGSEGV_THREAD_STATE_TYPE               ppc_thread_state_t
595	+	#define SIGSEGV_THREAD_STATE_FLAVOR             PPC_THREAD_STATE
596	+	#define SIGSEGV_THREAD_STATE_COUNT              PPC_THREAD_STATE_COUNT
597	+	#define SIGSEGV_FAULT_INSTRUCTION               state->srr0
598	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
599	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&state->srr0, (unsigned long *)&state->r0
600	+	#endif
601	+	#ifdef __i386__
602	+	#ifdef i386_SAVED_STATE
603	+	#define SIGSEGV_THREAD_STATE_TYPE               struct i386_saved_state
604	+	#define SIGSEGV_THREAD_STATE_FLAVOR             i386_SAVED_STATE
605	+	#define SIGSEGV_THREAD_STATE_COUNT              i386_SAVED_STATE_COUNT
606	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&state->edi) /* EDI is the first GPR we consider */
607	+	#else
608	+	#define SIGSEGV_THREAD_STATE_TYPE               struct i386_thread_state
609	+	#define SIGSEGV_THREAD_STATE_FLAVOR             i386_THREAD_STATE
610	+	#define SIGSEGV_THREAD_STATE_COUNT              i386_THREAD_STATE_COUNT
611	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&state->eax) /* EAX is the first GPR we consider */
612	+	#endif
613	+	#define SIGSEGV_FAULT_INSTRUCTION               state->eip
614	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
615	+	#endif
616	+	#define SIGSEGV_FAULT_ADDRESS                   code[1]
617	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
618	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, SIGSEGV_THREAD_STATE_TYPE *state
619	+	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
620	+
621	+	// Since there can only be one exception thread running at any time
622	+	// this is not a problem.
623	+	#define MSG_SIZE 512
624	+	static char msgbuf[MSG_SIZE];
625	+	static char replybuf[MSG_SIZE];
626	+
627	+	/*
628	+	* This is the entry point for the exception handler thread. The job
629	+	* of this thread is to wait for exception messages on the exception
630	+	* port that was setup beforehand and to pass them on to exc_server.
631	+	* exc_server is a MIG generated function that is a part of Mach.
632	+	* Its job is to decide what to do with the exception message. In our
633	+	* case exc_server calls catch_exception_raise on our behalf. After
634	+	* exc_server returns, it is our responsibility to send the reply.
635	+	*/
636	+	static void *
637	+	handleExceptions(void *priv)
638	+	{
639	+	mach_msg_header_t *msg, *reply;
640	+	kern_return_t krc;
641	+
642	+	msg = (mach_msg_header_t *)msgbuf;
643	+	reply = (mach_msg_header_t *)replybuf;
644	+
645	+	for (;;) {
646	+	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
647	+	_exceptionPort, 0, MACH_PORT_NULL);
648	+	MACH_CHECK_ERROR(mach_msg, krc);
649	+
650	+	if (!exc_server(msg, reply)) {
651	+	fprintf(stderr, "exc_server hated the message\n");
652	+	exit(1);
653	+	}
654	+
655	+	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
656	+	msg->msgh_local_port, 0, MACH_PORT_NULL);
657	+	if (krc != KERN_SUCCESS) {
658	+	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
659	+	krc, mach_error_string(krc));
660	+	exit(1);
661	+	}
662	+	}
663	+	}
664	+	#endif
665	+	#endif
666
667
668		/*
#	Line 387 | Line 671 | static sigsegv_address_t get_fault_addre
671
672		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
673		// Decode and skip X86 instruction
674	<	#if (defined(i386) || defined(__i386__))
674	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
675		#if defined(__linux__)
676		enum {
677	+	#if (defined(i386) || defined(__i386__))
678		X86_REG_EIP = 14,
679		X86_REG_EAX = 11,
680		X86_REG_ECX = 10,
#	Line 399 | Line 684 | enum {
684		X86_REG_EBP = 6,
685		X86_REG_ESI = 5,
686		X86_REG_EDI = 4
687	+	#endif
688	+	#if defined(__x86_64__)
689	+	X86_REG_R8  = 0,
690	+	X86_REG_R9  = 1,
691	+	X86_REG_R10 = 2,
692	+	X86_REG_R11 = 3,
693	+	X86_REG_R12 = 4,
694	+	X86_REG_R13 = 5,
695	+	X86_REG_R14 = 6,
696	+	X86_REG_R15 = 7,
697	+	X86_REG_EDI = 8,
698	+	X86_REG_ESI = 9,
699	+	X86_REG_EBP = 10,
700	+	X86_REG_EBX = 11,
701	+	X86_REG_EDX = 12,
702	+	X86_REG_EAX = 13,
703	+	X86_REG_ECX = 14,
704	+	X86_REG_ESP = 15,
705	+	X86_REG_EIP = 16
706	+	#endif
707	+	};
708	+	#endif
709	+	#if defined(__NetBSD__)
710	+	enum {
711	+	#if (defined(i386) || defined(__i386__))
712	+	X86_REG_EIP = _REG_EIP,
713	+	X86_REG_EAX = _REG_EAX,
714	+	X86_REG_ECX = _REG_ECX,
715	+	X86_REG_EDX = _REG_EDX,
716	+	X86_REG_EBX = _REG_EBX,
717	+	X86_REG_ESP = _REG_ESP,
718	+	X86_REG_EBP = _REG_EBP,
719	+	X86_REG_ESI = _REG_ESI,
720	+	X86_REG_EDI = _REG_EDI
721	+	#endif
722		};
723		#endif
724	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
724	>	#if defined(__FreeBSD__)
725		enum {
726	+	#if (defined(i386) || defined(__i386__))
727		X86_REG_EIP = 10,
728		X86_REG_EAX = 7,
729		X86_REG_ECX = 6,
#	Line 412 | Line 733 | enum {
733		X86_REG_EBP = 2,
734		X86_REG_ESI = 1,
735		X86_REG_EDI = 0
736	+	#endif
737	+	};
738	+	#endif
739	+	#if defined(__OpenBSD__)
740	+	enum {
741	+	#if defined(__i386__)
742	+	// EDI is the first register we consider
743	+	#define OREG(REG) offsetof(struct sigcontext, sc_##REG)
744	+	#define DREG(REG) ((OREG(REG) - OREG(edi)) / 4)
745	+	X86_REG_EIP = DREG(eip), // 7
746	+	X86_REG_EAX = DREG(eax), // 6
747	+	X86_REG_ECX = DREG(ecx), // 5
748	+	X86_REG_EDX = DREG(edx), // 4
749	+	X86_REG_EBX = DREG(ebx), // 3
750	+	X86_REG_ESP = DREG(esp), // 10
751	+	X86_REG_EBP = DREG(ebp), // 2
752	+	X86_REG_ESI = DREG(esi), // 1
753	+	X86_REG_EDI = DREG(edi)  // 0
754	+	#undef DREG
755	+	#undef OREG
756	+	#endif
757	+	};
758	+	#endif
759	+	#if defined(__sun__)
760	+	// Same as for Linux, need to check for x86-64
761	+	enum {
762	+	#if defined(__i386__)
763	+	X86_REG_EIP = EIP,
764	+	X86_REG_EAX = EAX,
765	+	X86_REG_ECX = ECX,
766	+	X86_REG_EDX = EDX,
767	+	X86_REG_EBX = EBX,
768	+	X86_REG_ESP = ESP,
769	+	X86_REG_EBP = EBP,
770	+	X86_REG_ESI = ESI,
771	+	X86_REG_EDI = EDI
772	+	#endif
773	+	};
774	+	#endif
775	+	#if defined(__APPLE__) && defined(__MACH__)
776	+	enum {
777	+	#ifdef i386_SAVED_STATE
778	+	// same as FreeBSD (in Open Darwin 8.0.1)
779	+	X86_REG_EIP = 10,
780	+	X86_REG_EAX = 7,
781	+	X86_REG_ECX = 6,
782	+	X86_REG_EDX = 5,
783	+	X86_REG_EBX = 4,
784	+	X86_REG_ESP = 13,
785	+	X86_REG_EBP = 2,
786	+	X86_REG_ESI = 1,
787	+	X86_REG_EDI = 0
788	+	#else
789	+	// new layout (MacOS X 10.4.4 for x86)
790	+	X86_REG_EIP = 10,
791	+	X86_REG_EAX = 0,
792	+	X86_REG_ECX = 2,
793	+	X86_REG_EDX = 4,
794	+	X86_REG_EBX = 1,
795	+	X86_REG_ESP = 7,
796	+	X86_REG_EBP = 6,
797	+	X86_REG_ESI = 5,
798	+	X86_REG_EDI = 4
799	+	#endif
800	+	};
801	+	#endif
802	+	#if defined(_WIN32)
803	+	enum {
804	+	#if (defined(i386) || defined(__i386__))
805	+	X86_REG_EIP = 7,
806	+	X86_REG_EAX = 5,
807	+	X86_REG_ECX = 4,
808	+	X86_REG_EDX = 3,
809	+	X86_REG_EBX = 2,
810	+	X86_REG_ESP = 10,
811	+	X86_REG_EBP = 6,
812	+	X86_REG_ESI = 1,
813	+	X86_REG_EDI = 0
814	+	#endif
815		};
816		#endif
817		// FIXME: this is partly redundant with the instruction decoding phase
#	Line 448 | Line 848 | static inline int ix86_step_over_modrm(u
848		return offset;
849		}
850
851	<	static bool ix86_skip_instruction(unsigned int * regs)
851	>	static bool ix86_skip_instruction(unsigned long * regs)
852		{
853		unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
854
855		if (eip == 0)
856		return false;
857	+	#ifdef _WIN32
858	+	if (IsBadCodePtr((FARPROC)eip))
859	+	return false;
860	+	#endif
861
862	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
862	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
863		transfer_size_t transfer_size = SIZE_LONG;
864
865		int reg = -1;
866		int len = 0;
867	<
867	>
868	>	#if DEBUG
869	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
870	>	eip, eip[0], eip[1], eip[2], eip[3]);
871	>	#endif
872	>
873		// Operand size prefix
874		if (*eip == 0x66) {
875		eip++;
#	Line 468 | Line 877 | static bool ix86_skip_instruction(unsign
877		transfer_size = SIZE_WORD;
878		}
879
880	+	// REX prefix
881	+	#if defined(__x86_64__)
882	+	struct rex_t {
883	+	unsigned char W;
884	+	unsigned char R;
885	+	unsigned char X;
886	+	unsigned char B;
887	+	};
888	+	rex_t rex = { 0, 0, 0, 0 };
889	+	bool has_rex = false;
890	+	if ((*eip & 0xf0) == 0x40) {
891	+	has_rex = true;
892	+	const unsigned char b = *eip;
893	+	rex.W = b & (1 << 3);
894	+	rex.R = b & (1 << 2);
895	+	rex.X = b & (1 << 1);
896	+	rex.B = b & (1 << 0);
897	+	#if DEBUG
898	+	printf("REX: %c,%c,%c,%c\n",
899	+	rex.W ? 'W' : '_',
900	+	rex.R ? 'R' : '_',
901	+	rex.X ? 'X' : '_',
902	+	rex.B ? 'B' : '_');
903	+	#endif
904	+	eip++;
905	+	len++;
906	+	if (rex.W)
907	+	transfer_size = SIZE_QUAD;
908	+	}
909	+	#else
910	+	const bool has_rex = false;
911	+	#endif
912	+
913		// Decode instruction
914	+	int target_size = SIZE_UNKNOWN;
915		switch (eip[0]) {
916		case 0x0f:
917	+	target_size = transfer_size;
918		switch (eip[1]) {
919	+	case 0xbe: // MOVSX r32, r/m8
920		case 0xb6: // MOVZX r32, r/m8
921	+	transfer_size = SIZE_BYTE;
922	+	goto do_mov_extend;
923	+	case 0xbf: // MOVSX r32, r/m16
924		case 0xb7: // MOVZX r32, r/m16
925	<	switch (eip[2] & 0xc0) {
926	<	case 0x80:
927	<	reg = (eip[2] >> 3) & 7;
928	<	transfer_type = TYPE_LOAD;
929	<	break;
930	<	case 0x40:
931	<	reg = (eip[2] >> 3) & 7;
932	<	transfer_type = TYPE_LOAD;
933	<	break;
934	<	case 0x00:
935	<	reg = (eip[2] >> 3) & 7;
936	<	transfer_type = TYPE_LOAD;
937	<	break;
938	<	}
939	<	len += 3 + ix86_step_over_modrm(eip + 2);
940	<	break;
925	>	transfer_size = SIZE_WORD;
926	>	goto do_mov_extend;
927	>	do_mov_extend:
928	>	switch (eip[2] & 0xc0) {
929	>	case 0x80:
930	>	reg = (eip[2] >> 3) & 7;
931	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
932	>	break;
933	>	case 0x40:
934	>	reg = (eip[2] >> 3) & 7;
935	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
936	>	break;
937	>	case 0x00:
938	>	reg = (eip[2] >> 3) & 7;
939	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
940	>	break;
941	>	}
942	>	len += 3 + ix86_step_over_modrm(eip + 2);
943	>	break;
944		}
945		break;
946		case 0x8a: // MOV r8, r/m8
#	Line 498 | Line 949 | static bool ix86_skip_instruction(unsign
949		switch (eip[1] & 0xc0) {
950		case 0x80:
951		reg = (eip[1] >> 3) & 7;
952	<	transfer_type = TYPE_LOAD;
952	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
953		break;
954		case 0x40:
955		reg = (eip[1] >> 3) & 7;
956	<	transfer_type = TYPE_LOAD;
956	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
957		break;
958		case 0x00:
959		reg = (eip[1] >> 3) & 7;
960	<	transfer_type = TYPE_LOAD;
960	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
961		break;
962		}
963		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 517 | Line 968 | static bool ix86_skip_instruction(unsign
968		switch (eip[1] & 0xc0) {
969		case 0x80:
970		reg = (eip[1] >> 3) & 7;
971	<	transfer_type = TYPE_STORE;
971	>	transfer_type = SIGSEGV_TRANSFER_STORE;
972		break;
973		case 0x40:
974		reg = (eip[1] >> 3) & 7;
975	<	transfer_type = TYPE_STORE;
975	>	transfer_type = SIGSEGV_TRANSFER_STORE;
976		break;
977		case 0x00:
978		reg = (eip[1] >> 3) & 7;
979	<	transfer_type = TYPE_STORE;
979	>	transfer_type = SIGSEGV_TRANSFER_STORE;
980		break;
981		}
982		len += 2 + ix86_step_over_modrm(eip + 1);
983		break;
984		}
985	+	if (target_size == SIZE_UNKNOWN)
986	+	target_size = transfer_size;
987
988	<	if (transfer_type == TYPE_UNKNOWN) {
988	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
989		// Unknown machine code, let it crash. Then patch the decoder
990		return false;
991		}
992
993	<	if (transfer_type == TYPE_LOAD && reg != -1) {
994	<	static const int x86_reg_map[8] = {
993	>	#if defined(__x86_64__)
994	>	if (rex.R)
995	>	reg += 8;
996	>	#endif
997	>
998	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
999	>	static const int x86_reg_map[] = {
1000		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
1001	<	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
1001	>	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
1002	>	#if defined(__x86_64__)
1003	>	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
1004	>	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
1005	>	#endif
1006		};
1007
1008	<	if (reg < 0 || reg >= 8)
1008	>	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
1009		return false;
1010
1011	+	// Set 0 to the relevant register part
1012	+	// NOTE: this is only valid for MOV alike instructions
1013		int rloc = x86_reg_map[reg];
1014	<	switch (transfer_size) {
1014	>	switch (target_size) {
1015		case SIZE_BYTE:
1016	<	regs[rloc] = (regs[rloc] & ~0xff);
1016	>	if (has_rex || reg < 4)
1017	>	regs[rloc] = (regs[rloc] & ~0x00ffL);
1018	>	else {
1019	>	rloc = x86_reg_map[reg - 4];
1020	>	regs[rloc] = (regs[rloc] & ~0xff00L);
1021	>	}
1022		break;
1023		case SIZE_WORD:
1024	<	regs[rloc] = (regs[rloc] & ~0xffff);
1024	>	regs[rloc] = (regs[rloc] & ~0xffffL);
1025		break;
1026		case SIZE_LONG:
1027	+	case SIZE_QUAD: // zero-extension
1028		regs[rloc] = 0;
1029		break;
1030		}
#	Line 562 | Line 1032 | static bool ix86_skip_instruction(unsign
1032
1033		#if DEBUG
1034		printf("%08x: %s %s access", regs[X86_REG_EIP],
1035	<	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
1036	<	transfer_type == TYPE_LOAD ? "read" : "write");
1035	>	transfer_size == SIZE_BYTE ? "byte" :
1036	>	transfer_size == SIZE_WORD ? "word" :
1037	>	transfer_size == SIZE_LONG ? "long" :
1038	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1039	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1040
1041		if (reg != -1) {
1042	<	static const char * x86_reg_str_map[8] = {
1043	<	"eax", "ecx", "edx", "ebx",
1044	<	"esp", "ebp", "esi", "edi"
1042	>	static const char * x86_byte_reg_str_map[] = {
1043	>	"al",   "cl",   "dl",   "bl",
1044	>	"spl",  "bpl",  "sil",  "dil",
1045	>	"r8b",  "r9b",  "r10b", "r11b",
1046	>	"r12b", "r13b", "r14b", "r15b",
1047	>	"ah",   "ch",   "dh",   "bh",
1048		};
1049	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
1049	>	static const char * x86_word_reg_str_map[] = {
1050	>	"ax",   "cx",   "dx",   "bx",
1051	>	"sp",   "bp",   "si",   "di",
1052	>	"r8w",  "r9w",  "r10w", "r11w",
1053	>	"r12w", "r13w", "r14w", "r15w",
1054	>	};
1055	>	static const char *x86_long_reg_str_map[] = {
1056	>	"eax",  "ecx",  "edx",  "ebx",
1057	>	"esp",  "ebp",  "esi",  "edi",
1058	>	"r8d",  "r9d",  "r10d", "r11d",
1059	>	"r12d", "r13d", "r14d", "r15d",
1060	>	};
1061	>	static const char *x86_quad_reg_str_map[] = {
1062	>	"rax", "rcx", "rdx", "rbx",
1063	>	"rsp", "rbp", "rsi", "rdi",
1064	>	"r8",  "r9",  "r10", "r11",
1065	>	"r12", "r13", "r14", "r15",
1066	>	};
1067	>	const char * reg_str = NULL;
1068	>	switch (target_size) {
1069	>	case SIZE_BYTE:
1070	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
1071	>	break;
1072	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
1073	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
1074	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
1075	>	}
1076	>	if (reg_str)
1077	>	printf(" %s register %%%s",
1078	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
1079	>	reg_str);
1080		}
1081		printf(", %d bytes instruction\n", len);
1082		#endif
#	Line 582 | Line 1088 | static bool ix86_skip_instruction(unsign
1088
1089		// Decode and skip PPC instruction
1090		#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
1091	<	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
1091	>	static bool powerpc_skip_instruction(unsigned long * nip_p, unsigned long * regs)
1092		{
1093		instruction_t instr;
1094		powerpc_decode_instruction(&instr, *nip_p, regs);
1095
1096	<	if (instr.transfer_type == TYPE_UNKNOWN) {
1096	>	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1097		// Unknown machine code, let it crash. Then patch the decoder
1098		return false;
1099		}
1100
1101		#if DEBUG
1102		printf("%08x: %s %s access", *nip_p,
1103	<	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
1104	<	instr.transfer_type == TYPE_LOAD ? "read" : "write");
1103	>	instr.transfer_size == SIZE_BYTE ? "byte" :
1104	>	instr.transfer_size == SIZE_WORD ? "word" :
1105	>	instr.transfer_size == SIZE_LONG ? "long" : "quad",
1106	>	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1107
1108		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1109		printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
1110	<	if (instr.transfer_type == TYPE_LOAD)
1110	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1111		printf(" r%d (rd = 0)\n", instr.rd);
1112		#endif
1113
1114		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1115		regs[instr.ra] = instr.addr;
1116	<	if (instr.transfer_type == TYPE_LOAD)
1116	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1117		regs[instr.rd] = 0;
1118
1119		*nip_p += 4;
1120		return true;
1121		}
1122		#endif
1123	+
1124	+	// Decode and skip MIPS instruction
1125	+	#if (defined(mips) || defined(__mips))
1126	+	enum {
1127	+	#if (defined(sgi) || defined(__sgi))
1128	+	MIPS_REG_EPC = 35,
1129	+	#endif
1130	+	};
1131	+	static bool mips_skip_instruction(greg_t * regs)
1132	+	{
1133	+	unsigned int * epc = (unsigned int *)(unsigned long)regs[MIPS_REG_EPC];
1134	+
1135	+	if (epc == 0)
1136	+	return false;
1137	+
1138	+	#if DEBUG
1139	+	printf("IP: %p [%08x]\n", epc, epc[0]);
1140	+	#endif
1141	+
1142	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1143	+	transfer_size_t transfer_size = SIZE_LONG;
1144	+	int direction = 0;
1145	+
1146	+	const unsigned int opcode = epc[0];
1147	+	switch (opcode >> 26) {
1148	+	case 32: // Load Byte
1149	+	case 36: // Load Byte Unsigned
1150	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1151	+	transfer_size = SIZE_BYTE;
1152	+	break;
1153	+	case 33: // Load Halfword
1154	+	case 37: // Load Halfword Unsigned
1155	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1156	+	transfer_size = SIZE_WORD;
1157	+	break;
1158	+	case 35: // Load Word
1159	+	case 39: // Load Word Unsigned
1160	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1161	+	transfer_size = SIZE_LONG;
1162	+	break;
1163	+	case 34: // Load Word Left
1164	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1165	+	transfer_size = SIZE_LONG;
1166	+	direction = -1;
1167	+	break;
1168	+	case 38: // Load Word Right
1169	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1170	+	transfer_size = SIZE_LONG;
1171	+	direction = 1;
1172	+	break;
1173	+	case 55: // Load Doubleword
1174	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1175	+	transfer_size = SIZE_QUAD;
1176	+	break;
1177	+	case 26: // Load Doubleword Left
1178	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1179	+	transfer_size = SIZE_QUAD;
1180	+	direction = -1;
1181	+	break;
1182	+	case 27: // Load Doubleword Right
1183	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1184	+	transfer_size = SIZE_QUAD;
1185	+	direction = 1;
1186	+	break;
1187	+	case 40: // Store Byte
1188	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1189	+	transfer_size = SIZE_BYTE;
1190	+	break;
1191	+	case 41: // Store Halfword
1192	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1193	+	transfer_size = SIZE_WORD;
1194	+	break;
1195	+	case 43: // Store Word
1196	+	case 42: // Store Word Left
1197	+	case 46: // Store Word Right
1198	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1199	+	transfer_size = SIZE_LONG;
1200	+	break;
1201	+	case 63: // Store Doubleword
1202	+	case 44: // Store Doubleword Left
1203	+	case 45: // Store Doubleword Right
1204	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1205	+	transfer_size = SIZE_QUAD;
1206	+	break;
1207	+	/* Misc instructions unlikely to be used within CPU emulators */
1208	+	case 48: // Load Linked Word
1209	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1210	+	transfer_size = SIZE_LONG;
1211	+	break;
1212	+	case 52: // Load Linked Doubleword
1213	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1214	+	transfer_size = SIZE_QUAD;
1215	+	break;
1216	+	case 56: // Store Conditional Word
1217	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1218	+	transfer_size = SIZE_LONG;
1219	+	break;
1220	+	case 60: // Store Conditional Doubleword
1221	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1222	+	transfer_size = SIZE_QUAD;
1223	+	break;
1224	+	}
1225	+
1226	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1227	+	// Unknown machine code, let it crash. Then patch the decoder
1228	+	return false;
1229	+	}
1230	+
1231	+	// Zero target register in case of a load operation
1232	+	const int reg = (opcode >> 16) & 0x1f;
1233	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
1234	+	if (direction == 0)
1235	+	regs[reg] = 0;
1236	+	else {
1237	+	// FIXME: untested code
1238	+	unsigned long ea = regs[(opcode >> 21) & 0x1f];
1239	+	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
1240	+	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
1241	+	unsigned long value;
1242	+	if (direction > 0) {
1243	+	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
1244	+	value = regs[reg] & rmask;
1245	+	}
1246	+	else {
1247	+	const unsigned long lmask = (1L << (offset * 8)) - 1;
1248	+	value = regs[reg] & lmask;
1249	+	}
1250	+	// restore most significant bits
1251	+	if (transfer_size == SIZE_LONG)
1252	+	value = (signed long)(signed int)value;
1253	+	regs[reg] = value;
1254	+	}
1255	+	}
1256	+
1257	+	#if DEBUG
1258	+	#if (defined(_ABIN32) || defined(_ABI64))
1259	+	static const char * mips_gpr_names[32] = {
1260	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1261	+	"t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
1262	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1263	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1264	+	};
1265	+	#else
1266	+	static const char * mips_gpr_names[32] = {
1267	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1268	+	"a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
1269	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1270	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1271	+	};
1272	+	#endif
1273	+	printf("%s %s register %s\n",
1274	+	transfer_size == SIZE_BYTE ? "byte" :
1275	+	transfer_size == SIZE_WORD ? "word" :
1276	+	transfer_size == SIZE_LONG ? "long" :
1277	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1278	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1279	+	mips_gpr_names[reg]);
1280	+	#endif
1281	+
1282	+	regs[MIPS_REG_EPC] += 4;
1283	+	return true;
1284	+	}
1285	+	#endif
1286	+
1287	+	// Decode and skip SPARC instruction
1288	+	#if (defined(sparc) || defined(__sparc__))
1289	+	enum {
1290	+	#if (defined(__sun__))
1291	+	SPARC_REG_G1 = REG_G1,
1292	+	SPARC_REG_O0 = REG_O0,
1293	+	SPARC_REG_PC = REG_PC,
1294		#endif
1295	+	};
1296	+	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
1297	+	{
1298	+	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
1299	+
1300	+	if (pc == 0)
1301	+	return false;
1302	+
1303	+	#if DEBUG
1304	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1305	+	#endif
1306	+
1307	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1308	+	transfer_size_t transfer_size = SIZE_LONG;
1309	+	bool register_pair = false;
1310	+
1311	+	const unsigned int opcode = pc[0];
1312	+	if ((opcode >> 30) != 3)
1313	+	return false;
1314	+	switch ((opcode >> 19) & 0x3f) {
1315	+	case 9: // Load Signed Byte
1316	+	case 1: // Load Unsigned Byte
1317	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1318	+	transfer_size = SIZE_BYTE;
1319	+	break;
1320	+	case 10:// Load Signed Halfword
1321	+	case 2: // Load Unsigned Word
1322	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1323	+	transfer_size = SIZE_WORD;
1324	+	break;
1325	+	case 8: // Load Word
1326	+	case 0: // Load Unsigned Word
1327	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1328	+	transfer_size = SIZE_LONG;
1329	+	break;
1330	+	case 11:// Load Extended Word
1331	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1332	+	transfer_size = SIZE_QUAD;
1333	+	break;
1334	+	case 3: // Load Doubleword
1335	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1336	+	transfer_size = SIZE_LONG;
1337	+	register_pair = true;
1338	+	break;
1339	+	case 5: // Store Byte
1340	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1341	+	transfer_size = SIZE_BYTE;
1342	+	break;
1343	+	case 6: // Store Halfword
1344	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1345	+	transfer_size = SIZE_WORD;
1346	+	break;
1347	+	case 4: // Store Word
1348	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1349	+	transfer_size = SIZE_LONG;
1350	+	break;
1351	+	case 14:// Store Extended Word
1352	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1353	+	transfer_size = SIZE_QUAD;
1354	+	break;
1355	+	case 7: // Store Doubleword
1356	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1357	+	transfer_size = SIZE_WORD;
1358	+	register_pair = true;
1359	+	break;
1360	+	}
1361	+
1362	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1363	+	// Unknown machine code, let it crash. Then patch the decoder
1364	+	return false;
1365	+	}
1366	+
1367	+	// Zero target register in case of a load operation
1368	+	const int reg = (opcode >> 25) & 0x1f;
1369	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
1370	+	// FIXME: code to handle local & input registers is not tested
1371	+	if (reg >= 1 && reg <= 7) {
1372	+	// global registers
1373	+	regs[reg - 1 + SPARC_REG_G1] = 0;
1374	+	}
1375	+	else if (reg >= 8 && reg <= 15) {
1376	+	// output registers
1377	+	regs[reg - 8 + SPARC_REG_O0] = 0;
1378	+	}
1379	+	else if (reg >= 16 && reg <= 23) {
1380	+	// local registers (in register windows)
1381	+	if (gwins)
1382	+	gwins->wbuf->rw_local[reg - 16] = 0;
1383	+	else
1384	+	rwin->rw_local[reg - 16] = 0;
1385	+	}
1386	+	else {
1387	+	// input registers (in register windows)
1388	+	if (gwins)
1389	+	gwins->wbuf->rw_in[reg - 24] = 0;
1390	+	else
1391	+	rwin->rw_in[reg - 24] = 0;
1392	+	}
1393	+	}
1394	+
1395	+	#if DEBUG
1396	+	static const char * reg_names[] = {
1397	+	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
1398	+	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
1399	+	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
1400	+	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
1401	+	};
1402	+	printf("%s %s register %s\n",
1403	+	transfer_size == SIZE_BYTE ? "byte" :
1404	+	transfer_size == SIZE_WORD ? "word" :
1405	+	transfer_size == SIZE_LONG ? "long" :
1406	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1407	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1408	+	reg_names[reg]);
1409	+	#endif
1410	+
1411	+	regs[SPARC_REG_PC] += 4;
1412	+	return true;
1413	+	}
1414	+	#endif
1415	+	#endif
1416	+
1417	+	// Decode and skip ARM instruction
1418	+	#if (defined(arm) || defined(__arm__))
1419	+	enum {
1420	+	#if (defined(__linux__))
1421	+	ARM_REG_PC = 15,
1422	+	ARM_REG_CPSR = 16
1423	+	#endif
1424	+	};
1425	+	static bool arm_skip_instruction(unsigned long * regs)
1426	+	{
1427	+	unsigned int * pc = (unsigned int *)regs[ARM_REG_PC];
1428	+
1429	+	if (pc == 0)
1430	+	return false;
1431	+
1432	+	#if DEBUG
1433	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1434	+	#endif
1435	+
1436	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1437	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
1438	+	enum { op_sdt = 1, op_sdth = 2 };
1439	+	int op = 0;
1440	+
1441	+	// Handle load/store instructions only
1442	+	const unsigned int opcode = pc[0];
1443	+	switch ((opcode >> 25) & 7) {
1444	+	case 0: // Halfword and Signed Data Transfer (LDRH, STRH, LDRSB, LDRSH)
1445	+	op = op_sdth;
1446	+	// Determine transfer size (S/H bits)
1447	+	switch ((opcode >> 5) & 3) {
1448	+	case 0: // SWP instruction
1449	+	break;
1450	+	case 1: // Unsigned halfwords
1451	+	case 3: // Signed halfwords
1452	+	transfer_size = SIZE_WORD;
1453	+	break;
1454	+	case 2: // Signed byte
1455	+	transfer_size = SIZE_BYTE;
1456	+	break;
1457	+	}
1458	+	break;
1459	+	case 2:
1460	+	case 3: // Single Data Transfer (LDR, STR)
1461	+	op = op_sdt;
1462	+	// Determine transfer size (B bit)
1463	+	if (((opcode >> 22) & 1) == 1)
1464	+	transfer_size = SIZE_BYTE;
1465	+	else
1466	+	transfer_size = SIZE_LONG;
1467	+	break;
1468	+	default:
1469	+	// FIXME: support load/store mutliple?
1470	+	return false;
1471	+	}
1472	+
1473	+	// Check for invalid transfer size (SWP instruction?)
1474	+	if (transfer_size == SIZE_UNKNOWN)
1475	+	return false;
1476	+
1477	+	// Determine transfer type (L bit)
1478	+	if (((opcode >> 20) & 1) == 1)
1479	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1480	+	else
1481	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1482	+
1483	+	// Compute offset
1484	+	int offset;
1485	+	if (((opcode >> 25) & 1) == 0) {
1486	+	if (op == op_sdt)
1487	+	offset = opcode & 0xfff;
1488	+	else if (op == op_sdth) {
1489	+	int rm = opcode & 0xf;
1490	+	if (((opcode >> 22) & 1) == 0) {
1491	+	// register offset
1492	+	offset = regs[rm];
1493	+	}
1494	+	else {
1495	+	// immediate offset
1496	+	offset = ((opcode >> 4) & 0xf0) | (opcode & 0x0f);
1497	+	}
1498	+	}
1499	+	}
1500	+	else {
1501	+	const int rm = opcode & 0xf;
1502	+	const int sh = (opcode >> 7) & 0x1f;
1503	+	if (((opcode >> 4) & 1) == 1) {
1504	+	// we expect only legal load/store instructions
1505	+	printf("FATAL: invalid shift operand\n");
1506	+	return false;
1507	+	}
1508	+	const unsigned int v = regs[rm];
1509	+	switch ((opcode >> 5) & 3) {
1510	+	case 0: // logical shift left
1511	+	offset = sh ? v << sh : v;
1512	+	break;
1513	+	case 1: // logical shift right
1514	+	offset = sh ? v >> sh : 0;
1515	+	break;
1516	+	case 2: // arithmetic shift right
1517	+	if (sh)
1518	+	offset = ((signed int)v) >> sh;
1519	+	else
1520	+	offset = (v & 0x80000000) ? 0xffffffff : 0;
1521	+	break;
1522	+	case 3: // rotate right
1523	+	if (sh)
1524	+	offset = (v >> sh) | (v << (32 - sh));
1525	+	else
1526	+	offset = (v >> 1) | ((regs[ARM_REG_CPSR] << 2) & 0x80000000);
1527	+	break;
1528	+	}
1529	+	}
1530	+	if (((opcode >> 23) & 1) == 0)
1531	+	offset = -offset;
1532	+
1533	+	int rd = (opcode >> 12) & 0xf;
1534	+	int rn = (opcode >> 16) & 0xf;
1535	+	#if DEBUG
1536	+	static const char * reg_names[] = {
1537	+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1538	+	"r9", "r9", "sl", "fp", "ip", "sp", "lr", "pc"
1539	+	};
1540	+	printf("%s %s register %s\n",
1541	+	transfer_size == SIZE_BYTE ? "byte" :
1542	+	transfer_size == SIZE_WORD ? "word" :
1543	+	transfer_size == SIZE_LONG ? "long" : "unknown",
1544	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1545	+	reg_names[rd]);
1546	+	#endif
1547	+
1548	+	unsigned int base = regs[rn];
1549	+	if (((opcode >> 24) & 1) == 1)
1550	+	base += offset;
1551	+
1552	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD)
1553	+	regs[rd] = 0;
1554	+
1555	+	if (((opcode >> 24) & 1) == 0)                // post-index addressing
1556	+	regs[rn] += offset;
1557	+	else if (((opcode >> 21) & 1) == 1)   // write-back address into base
1558	+	regs[rn] = base;
1559	+
1560	+	regs[ARM_REG_PC] += 4;
1561	+	return true;
1562	+	}
1563	+	#endif
1564	+
1565
1566		// Fallbacks
1567		#ifndef SIGSEGV_FAULT_INSTRUCTION
1568		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
1569		#endif
1570	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
1571	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
1572	+	#endif
1573	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
1574	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
1575	+	#endif
1576
1577		// SIGSEGV recovery supported ?
1578		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 629 | Line 1584 | static bool powerpc_skip_instruction(uns
1584		*  SIGSEGV global handler
1585		*/
1586
1587	<	#ifdef HAVE_SIGSEGV_RECOVERY
1588	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1587	>	// This function handles the badaccess to memory.
1588	>	// It is called from the signal handler or the exception handler.
1589	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
1590		{
1591	+	#ifdef HAVE_MACH_EXCEPTIONS
1592	+	// We must match the initial count when writing back the CPU state registers
1593	+	kern_return_t krc;
1594	+	mach_msg_type_number_t count;
1595	+
1596	+	count = SIGSEGV_THREAD_STATE_COUNT;
1597	+	krc = thread_get_state(thread, SIGSEGV_THREAD_STATE_FLAVOR, (thread_state_t)state, &count);
1598	+	MACH_CHECK_ERROR (thread_get_state, krc);
1599	+	#endif
1600	+
1601		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
1602		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
637	–	bool fault_recovered = false;
1603
1604		// Call user's handler and reinstall the global handler, if required
1605	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
1606	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1607	<	sigsegv_do_install_handler(sig);
1605	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
1606	>	case SIGSEGV_RETURN_SUCCESS:
1607	>	return true;
1608	>
1609	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1610	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
1611	>	// Call the instruction skipper with the register file
1612	>	// available
1613	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
1614	>	#ifdef HAVE_MACH_EXCEPTIONS
1615	>	// Unlike UNIX signals where the thread state
1616	>	// is modified off of the stack, in Mach we
1617	>	// need to actually call thread_set_state to
1618	>	// have the register values updated.
1619	>	krc = thread_set_state(thread,
1620	>	SIGSEGV_THREAD_STATE_FLAVOR, (thread_state_t)state,
1621	>	count);
1622	>	MACH_CHECK_ERROR (thread_set_state, krc);
1623	>	#endif
1624	>	return true;
1625	>	}
1626	>	break;
1627		#endif
1628	<	fault_recovered = true;
1628	>	case SIGSEGV_RETURN_FAILURE:
1629	>	// We can't do anything with the fault_address, dump state?
1630	>	if (sigsegv_state_dumper != 0)
1631	>	sigsegv_state_dumper(fault_address, fault_instruction);
1632	>	break;
1633		}
1634	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1635	<	else if (sigsegv_ignore_fault) {
1636	<	// Call the instruction skipper with the register file available
1637	<	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
1638	<	fault_recovered = true;
1634	>
1635	>	return false;
1636	>	}
1637	>
1638	>
1639	>	/*
1640	>	* There are two mechanisms for handling a bad memory access,
1641	>	* Mach exceptions and UNIX signals. The implementation specific
1642	>	* code appears below. Its reponsibility is to call handle_badaccess
1643	>	* which is the routine that handles the fault in an implementation
1644	>	* agnostic manner. The implementation specific code below is then
1645	>	* reponsible for checking whether handle_badaccess was able
1646	>	* to handle the memory access error and perform any implementation
1647	>	* specific tasks necessary afterwards.
1648	>	*/
1649	>
1650	>	#ifdef HAVE_MACH_EXCEPTIONS
1651	>	/*
1652	>	* We need to forward all exceptions that we do not handle.
1653	>	* This is important, there are many exceptions that may be
1654	>	* handled by other exception handlers. For example debuggers
1655	>	* use exceptions and the exception hander is in another
1656	>	* process in such a case. (Timothy J. Wood states in his
1657	>	* message to the list that he based this code on that from
1658	>	* gdb for Darwin.)
1659	>	*/
1660	>	static inline kern_return_t
1661	>	forward_exception(mach_port_t thread_port,
1662	>	mach_port_t task_port,
1663	>	exception_type_t exception_type,
1664	>	exception_data_t exception_data,
1665	>	mach_msg_type_number_t data_count,
1666	>	ExceptionPorts *oldExceptionPorts)
1667	>	{
1668	>	kern_return_t kret;
1669	>	unsigned int portIndex;
1670	>	mach_port_t port;
1671	>	exception_behavior_t behavior;
1672	>	thread_state_flavor_t flavor;
1673	>	thread_state_data_t thread_state;
1674	>	mach_msg_type_number_t thread_state_count;
1675	>
1676	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1677	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1678	>	// This handler wants the exception
1679	>	break;
1680	>	}
1681	>	}
1682	>
1683	>	if (portIndex >= oldExceptionPorts->maskCount) {
1684	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1685	>	return KERN_FAILURE;
1686		}
1687	+
1688	+	port = oldExceptionPorts->handlers[portIndex];
1689	+	behavior = oldExceptionPorts->behaviors[portIndex];
1690	+	flavor = oldExceptionPorts->flavors[portIndex];
1691	+
1692	+	/*
1693	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1694	+	*/
1695	+
1696	+	if (behavior != EXCEPTION_DEFAULT) {
1697	+	thread_state_count = THREAD_STATE_MAX;
1698	+	kret = thread_get_state (thread_port, flavor, thread_state,
1699	+	&thread_state_count);
1700	+	MACH_CHECK_ERROR (thread_get_state, kret);
1701	+	}
1702	+
1703	+	switch (behavior) {
1704	+	case EXCEPTION_DEFAULT:
1705	+	// fprintf(stderr, "forwarding to exception_raise\n");
1706	+	kret = exception_raise(port, thread_port, task_port, exception_type,
1707	+	exception_data, data_count);
1708	+	MACH_CHECK_ERROR (exception_raise, kret);
1709	+	break;
1710	+	case EXCEPTION_STATE:
1711	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
1712	+	kret = exception_raise_state(port, exception_type, exception_data,
1713	+	data_count, &flavor,
1714	+	thread_state, thread_state_count,
1715	+	thread_state, &thread_state_count);
1716	+	MACH_CHECK_ERROR (exception_raise_state, kret);
1717	+	break;
1718	+	case EXCEPTION_STATE_IDENTITY:
1719	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1720	+	kret = exception_raise_state_identity(port, thread_port, task_port,
1721	+	exception_type, exception_data,
1722	+	data_count, &flavor,
1723	+	thread_state, thread_state_count,
1724	+	thread_state, &thread_state_count);
1725	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1726	+	break;
1727	+	default:
1728	+	fprintf(stderr, "forward_exception got unknown behavior\n");
1729	+	break;
1730	+	}
1731	+
1732	+	if (behavior != EXCEPTION_DEFAULT) {
1733	+	kret = thread_set_state (thread_port, flavor, thread_state,
1734	+	thread_state_count);
1735	+	MACH_CHECK_ERROR (thread_set_state, kret);
1736	+	}
1737	+
1738	+	return KERN_SUCCESS;
1739	+	}
1740	+
1741	+	/*
1742	+	* This is the code that actually handles the exception.
1743	+	* It is called by exc_server. For Darwin 5 Apple changed
1744	+	* this a bit from how this family of functions worked in
1745	+	* Mach. If you are familiar with that it is a little
1746	+	* different. The main variation that concerns us here is
1747	+	* that code is an array of exception specific codes and
1748	+	* codeCount is a count of the number of codes in the code
1749	+	* array. In typical Mach all exceptions have a code
1750	+	* and sub-code. It happens to be the case that for a
1751	+	* EXC_BAD_ACCESS exception the first entry is the type of
1752	+	* bad access that occurred and the second entry is the
1753	+	* faulting address so these entries correspond exactly to
1754	+	* how the code and sub-code are used on Mach.
1755	+	*
1756	+	* This is a MIG interface. No code in Basilisk II should
1757	+	* call this directley. This has to have external C
1758	+	* linkage because that is what exc_server expects.
1759	+	*/
1760	+	kern_return_t
1761	+	catch_exception_raise(mach_port_t exception_port,
1762	+	mach_port_t thread,
1763	+	mach_port_t task,
1764	+	exception_type_t exception,
1765	+	exception_data_t code,
1766	+	mach_msg_type_number_t codeCount)
1767	+	{
1768	+	SIGSEGV_THREAD_STATE_TYPE state;
1769	+	kern_return_t krc;
1770	+
1771	+	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
1772	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1773	+	return KERN_SUCCESS;
1774	+	}
1775	+
1776	+	// In Mach we do not need to remove the exception handler.
1777	+	// If we forward the exception, eventually some exception handler
1778	+	// will take care of this exception.
1779	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1780	+
1781	+	return krc;
1782	+	}
1783		#endif
1784
1785	<	if (!fault_recovered) {
1786	<	// FAIL: reinstall default handler for "safe" crash
1785	>	#ifdef HAVE_SIGSEGV_RECOVERY
1786	>	// Handle bad memory accesses with signal handler
1787	>	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1788	>	{
1789	>	// Call handler and reinstall the global handler, if required
1790	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1791	>	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1792	>	sigsegv_do_install_handler(sig);
1793	>	#endif
1794	>	return;
1795	>	}
1796	>
1797	>	// Failure: reinstall default handler for "safe" crash
1798		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1799	<	SIGSEGV_ALL_SIGNALS
1799	>	SIGSEGV_ALL_SIGNALS
1800		#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	–	}
1801		}
1802		#endif
1803
#	Line 674 | Line 1811 | static bool sigsegv_do_install_handler(i
1811		{
1812		// Setup SIGSEGV handler to process writes to frame buffer
1813		#ifdef HAVE_SIGACTION
1814	<	struct sigaction vosf_sa;
1815	<	sigemptyset(&vosf_sa.sa_mask);
1816	<	vosf_sa.sa_sigaction = sigsegv_handler;
1817	<	vosf_sa.sa_flags = SA_SIGINFO;
1818	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1814	>	struct sigaction sigsegv_sa;
1815	>	sigemptyset(&sigsegv_sa.sa_mask);
1816	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1817	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1818	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1819		#else
1820		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1821		#endif
#	Line 690 | Line 1827 | static bool sigsegv_do_install_handler(i
1827		{
1828		// Setup SIGSEGV handler to process writes to frame buffer
1829		#ifdef HAVE_SIGACTION
1830	<	struct sigaction vosf_sa;
1831	<	sigemptyset(&vosf_sa.sa_mask);
1832	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1830	>	struct sigaction sigsegv_sa;
1831	>	sigemptyset(&sigsegv_sa.sa_mask);
1832	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1833	>	sigsegv_sa.sa_flags = 0;
1834		#if !EMULATED_68K && defined(__NetBSD__)
1835	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1836	<	vosf_sa.sa_flags = SA_ONSTACK;
699	<	#else
700	<	vosf_sa.sa_flags = 0;
1835	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1836	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1837		#endif
1838	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1838	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1839		#else
1840		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1841		#endif
1842		}
1843		#endif
1844
1845	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1845	>	#if defined(HAVE_MACH_EXCEPTIONS)
1846	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1847		{
1848	<	#ifdef HAVE_SIGSEGV_RECOVERY
1848	>	/*
1849	>	* Except for the exception port functions, this should be
1850	>	* pretty much stock Mach. If later you choose to support
1851	>	* other Mach's besides Darwin, just check for __MACH__
1852	>	* here and __APPLE__ where the actual differences are.
1853	>	*/
1854	>	#if defined(__APPLE__) && defined(__MACH__)
1855	>	if (sigsegv_fault_handler != NULL) {
1856	>	sigsegv_fault_handler = handler;
1857	>	return true;
1858	>	}
1859	>
1860	>	kern_return_t krc;
1861	>
1862	>	// create the the exception port
1863	>	krc = mach_port_allocate(mach_task_self(),
1864	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1865	>	if (krc != KERN_SUCCESS) {
1866	>	mach_error("mach_port_allocate", krc);
1867	>	return false;
1868	>	}
1869	>
1870	>	// add a port send right
1871	>	krc = mach_port_insert_right(mach_task_self(),
1872	>	_exceptionPort, _exceptionPort,
1873	>	MACH_MSG_TYPE_MAKE_SEND);
1874	>	if (krc != KERN_SUCCESS) {
1875	>	mach_error("mach_port_insert_right", krc);
1876	>	return false;
1877	>	}
1878	>
1879	>	// get the old exception ports
1880	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1881	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1882	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1883	>	if (krc != KERN_SUCCESS) {
1884	>	mach_error("thread_get_exception_ports", krc);
1885	>	return false;
1886	>	}
1887	>
1888	>	// set the new exception port
1889	>	//
1890	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1891	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1892	>	// message, but it turns out that in the common case this is not
1893	>	// neccessary. If we need it we can later ask for it from the
1894	>	// suspended thread.
1895	>	//
1896	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1897	>	// counter in the thread state.  The comments in the header file
1898	>	// seem to imply that you can count on the GPR's on an exception
1899	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1900	>	// you have to ask for all of the GPR's anyway just to get the
1901	>	// program counter. In any case because of update effective
1902	>	// address from immediate and update address from effective
1903	>	// addresses of ra and rb modes (as good an name as any for these
1904	>	// addressing modes) used in PPC instructions, you will need the
1905	>	// GPR state anyway.
1906	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1907	>	EXCEPTION_DEFAULT, SIGSEGV_THREAD_STATE_FLAVOR);
1908	>	if (krc != KERN_SUCCESS) {
1909	>	mach_error("thread_set_exception_ports", krc);
1910	>	return false;
1911	>	}
1912	>
1913	>	// create the exception handler thread
1914	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1915	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1916	>	return false;
1917	>	}
1918	>
1919	>	// do not care about the exception thread any longer, let is run standalone
1920	>	(void)pthread_detach(exc_thread);
1921	>
1922	>	sigsegv_fault_handler = handler;
1923	>	return true;
1924	>	#else
1925	>	return false;
1926	>	#endif
1927	>	}
1928	>	#endif
1929	>
1930	>	#ifdef HAVE_WIN32_EXCEPTIONS
1931	>	static LONG WINAPI main_exception_filter(EXCEPTION_POINTERS *ExceptionInfo)
1932	>	{
1933	>	if (sigsegv_fault_handler != NULL
1934	>	&& ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
1935	>	&& ExceptionInfo->ExceptionRecord->NumberParameters == 2
1936	>	&& handle_badaccess(ExceptionInfo))
1937	>	return EXCEPTION_CONTINUE_EXECUTION;
1938	>
1939	>	return EXCEPTION_CONTINUE_SEARCH;
1940	>	}
1941	>
1942	>	#if defined __CYGWIN__ && defined __i386__
1943	>	/* In Cygwin programs, SetUnhandledExceptionFilter has no effect because Cygwin
1944	>	installs a global exception handler.  We have to dig deep in order to install
1945	>	our main_exception_filter.  */
1946	>
1947	>	/* Data structures for the current thread's exception handler chain.
1948	>	On the x86 Windows uses register fs, offset 0 to point to the current
1949	>	exception handler; Cygwin mucks with it, so we must do the same... :-/ */
1950	>
1951	>	/* Magic taken from winsup/cygwin/include/exceptions.h.  */
1952	>
1953	>	struct exception_list {
1954	>	struct exception_list *prev;
1955	>	int (*handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
1956	>	};
1957	>	typedef struct exception_list exception_list;
1958	>
1959	>	/* Magic taken from winsup/cygwin/exceptions.cc.  */
1960	>
1961	>	__asm__ (".equ __except_list,0");
1962	>
1963	>	extern exception_list *_except_list __asm__ ("%fs:__except_list");
1964	>
1965	>	/* For debugging.  _except_list is not otherwise accessible from gdb.  */
1966	>	static exception_list *
1967	>	debug_get_except_list ()
1968	>	{
1969	>	return _except_list;
1970	>	}
1971	>
1972	>	/* Cygwin's original exception handler.  */
1973	>	static int (*cygwin_exception_handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
1974	>
1975	>	/* Our exception handler.  */
1976	>	static int
1977	>	libsigsegv_exception_handler (EXCEPTION_RECORD *exception, void *frame, CONTEXT *context, void *dispatch)
1978	>	{
1979	>	EXCEPTION_POINTERS ExceptionInfo;
1980	>	ExceptionInfo.ExceptionRecord = exception;
1981	>	ExceptionInfo.ContextRecord = context;
1982	>	if (main_exception_filter (&ExceptionInfo) == EXCEPTION_CONTINUE_SEARCH)
1983	>	return cygwin_exception_handler (exception, frame, context, dispatch);
1984	>	else
1985	>	return 0;
1986	>	}
1987	>
1988	>	static void
1989	>	do_install_main_exception_filter ()
1990	>	{
1991	>	/* We cannot insert any handler into the chain, because such handlers
1992	>	must lie on the stack (?).  Instead, we have to replace(!) Cygwin's
1993	>	global exception handler.  */
1994	>	cygwin_exception_handler = _except_list->handler;
1995	>	_except_list->handler = libsigsegv_exception_handler;
1996	>	}
1997	>
1998	>	#else
1999	>
2000	>	static void
2001	>	do_install_main_exception_filter ()
2002	>	{
2003	>	SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) &main_exception_filter);
2004	>	}
2005	>	#endif
2006	>
2007	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
2008	>	{
2009	>	static bool main_exception_filter_installed = false;
2010	>	if (!main_exception_filter_installed) {
2011	>	do_install_main_exception_filter();
2012	>	main_exception_filter_installed = true;
2013	>	}
2014		sigsegv_fault_handler = handler;
2015	+	return true;
2016	+	}
2017	+	#endif
2018	+
2019	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
2020	+	{
2021	+	#if defined(HAVE_SIGSEGV_RECOVERY)
2022		bool success = true;
2023		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
2024		SIGSEGV_ALL_SIGNALS
2025		#undef FAULT_HANDLER
2026	+	if (success)
2027	+	sigsegv_fault_handler = handler;
2028		return success;
2029	+	#elif defined(HAVE_MACH_EXCEPTIONS) || defined(HAVE_WIN32_EXCEPTIONS)
2030	+	return sigsegv_do_install_handler(handler);
2031		#else
2032		// FAIL: no siginfo_t nor sigcontext subterfuge is available
2033		return false;
#	Line 728 | Line 2041 | bool sigsegv_install_handler(sigsegv_fau
2041
2042		void sigsegv_deinstall_handler(void)
2043		{
2044	+	// We do nothing for Mach exceptions, the thread would need to be
2045	+	// suspended if not already so, and we might mess with other
2046	+	// exception handlers that came after we registered ours. There is
2047	+	// no need to remove the exception handler, in fact this function is
2048	+	// not called anywhere in Basilisk II.
2049		#ifdef HAVE_SIGSEGV_RECOVERY
2050		sigsegv_fault_handler = 0;
2051		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
2052		SIGSEGV_ALL_SIGNALS
2053		#undef FAULT_HANDLER
2054		#endif
2055	<	}
2056	<
2057	<
740	<	/*
741	<	*  SIGSEGV ignore state modifier
742	<	*/
743	<
744	<	void sigsegv_set_ignore_state(bool ignore_fault)
745	<	{
746	<	sigsegv_ignore_fault = ignore_fault;
2055	>	#ifdef HAVE_WIN32_EXCEPTIONS
2056	>	sigsegv_fault_handler = NULL;
2057	>	#endif
2058		}
2059
2060
#	Line 765 | Line 2076 | void sigsegv_set_dump_state(sigsegv_stat
2076		#include <stdio.h>
2077		#include <stdlib.h>
2078		#include <fcntl.h>
2079	+	#ifdef HAVE_SYS_MMAN_H
2080		#include <sys/mman.h>
2081	+	#endif
2082		#include "vm_alloc.h"
2083
2084	+	const int REF_INDEX = 123;
2085	+	const int REF_VALUE = 45;
2086	+
2087		static int page_size;
2088		static volatile char * page = 0;
2089		static volatile int handler_called = 0;
2090
2091	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2091	>	#ifdef __GNUC__
2092	>	// Code range where we expect the fault to come from
2093	>	static void *b_region, *e_region;
2094	>	#endif
2095	>
2096	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2097		{
2098	+	#if DEBUG
2099	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
2100	+	printf("expected fault at %p\n", page + REF_INDEX);
2101	+	#ifdef __GNUC__
2102	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
2103	+	#endif
2104	+	#endif
2105		handler_called++;
2106	<	if ((fault_address - 123) != page)
2107	<	exit(1);
2106	>	if ((fault_address - REF_INDEX) != page)
2107	>	exit(10);
2108	>	#ifdef __GNUC__
2109	>	// Make sure reported fault instruction address falls into
2110	>	// expected code range
2111	>	if (instruction_address != SIGSEGV_INVALID_PC
2112	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
2113	>	(instruction_address >= (sigsegv_address_t)e_region)))
2114	>	exit(11);
2115	>	#endif
2116		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
2117	<	exit(1);
2118	<	return true;
2117	>	exit(12);
2118	>	return SIGSEGV_RETURN_SUCCESS;
2119		}
2120
2121		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2122	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2122	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2123		{
2124	<	return false;
2124	>	#if DEBUG
2125	>	printf("sigsegv_insn_handler(%p, %p)\n", fault_address, instruction_address);
2126	>	#endif
2127	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
2128	>	#ifdef __GNUC__
2129	>	// Make sure reported fault instruction address falls into
2130	>	// expected code range
2131	>	if (instruction_address != SIGSEGV_INVALID_PC
2132	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
2133	>	(instruction_address >= (sigsegv_address_t)e_region)))
2134	>	return SIGSEGV_RETURN_FAILURE;
2135	>	#endif
2136	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
2137	>	}
2138	>
2139	>	return SIGSEGV_RETURN_FAILURE;
2140	>	}
2141	>
2142	>	// More sophisticated tests for instruction skipper
2143	>	static bool arch_insn_skipper_tests()
2144	>	{
2145	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
2146	>	static const unsigned char code[] = {
2147	>	0x8a, 0x00,                    // mov    (%eax),%al
2148	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
2149	>	0x88, 0x20,                    // mov    %ah,(%eax)
2150	>	0x88, 0x08,                    // mov    %cl,(%eax)
2151	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
2152	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
2153	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
2154	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
2155	>	0x8b, 0x00,                    // mov    (%eax),%eax
2156	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
2157	>	0x89, 0x00,                    // mov    %eax,(%eax)
2158	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
2159	>	#if defined(__x86_64__)
2160	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
2161	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
2162	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
2163	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
2164	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
2165	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
2166	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
2167	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
2168	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
2169	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
2170	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
2171	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
2172	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
2173	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
2174	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
2175	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
2176	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
2177	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
2178	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
2179	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
2180	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
2181	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
2182	>	#endif
2183	>	0                              // end
2184	>	};
2185	>	const int N_REGS = 20;
2186	>	unsigned long regs[N_REGS];
2187	>	for (int i = 0; i < N_REGS; i++)
2188	>	regs[i] = i;
2189	>	const unsigned long start_code = (unsigned long)&code;
2190	>	regs[X86_REG_EIP] = start_code;
2191	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
2192	>	&& ix86_skip_instruction(regs))
2193	>	; /* simply iterate */
2194	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
2195	>	#endif
2196	>	return true;
2197		}
2198		#endif
2199
#	Line 794 | Line 2202 | int main(void)
2202		if (vm_init() < 0)
2203		return 1;
2204
2205	<	page_size = getpagesize();
2205	>	page_size = vm_get_page_size();
2206		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
2207	<	return 1;
2207	>	return 2;
2208
2209	+	memset((void *)page, 0, page_size);
2210		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
2211	<	return 1;
2211	>	return 3;
2212
2213		if (!sigsegv_install_handler(sigsegv_test_handler))
2214	<	return 1;
806	<
807	<	page[123] = 45;
808	<	page[123] = 45;
2214	>	return 4;
2215
2216	+	#ifdef __GNUC__
2217	+	b_region = &&L_b_region1;
2218	+	e_region = &&L_e_region1;
2219	+	#endif
2220	+	L_b_region1:
2221	+	page[REF_INDEX] = REF_VALUE;
2222	+	if (page[REF_INDEX] != REF_VALUE)
2223	+	exit(20);
2224	+	page[REF_INDEX] = REF_VALUE;
2225	+	L_e_region1:
2226	+
2227		if (handler_called != 1)
2228	<	return 1;
2228	>	return 5;
2229
2230		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2231		if (!sigsegv_install_handler(sigsegv_insn_handler))
2232	<	return 1;
2232	>	return 6;
2233
2234		if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
2235	<	return 1;
2235	>	return 7;
2236
2237		for (int i = 0; i < page_size; i++)
2238		page[i] = (i + 1) % page_size;
2239
2240		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
2241	<	return 1;
2241	>	return 8;
2242
826	–	sigsegv_set_ignore_state(true);
827	–
2243		#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
2244	<	const unsigned int TAG = 0x12345678;                    \
2244	>	const unsigned long TAG = 0x12345678 |                  \
2245	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
2246		TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
2247	<	volatile unsigned int effect = data + TAG;              \
2247	>	volatile unsigned long effect = data + TAG;             \
2248		if (effect != TAG)                                                              \
2249	<	return 1;                                                                       \
2249	>	return 9;                                                                       \
2250		} while (0)
2251
2252	+	#ifdef __GNUC__
2253	+	b_region = &&L_b_region2;
2254	+	e_region = &&L_e_region2;
2255	+	#endif
2256	+	L_b_region2:
2257		TEST_SKIP_INSTRUCTION(unsigned char);
2258		TEST_SKIP_INSTRUCTION(unsigned short);
2259		TEST_SKIP_INSTRUCTION(unsigned int);
2260	+	TEST_SKIP_INSTRUCTION(unsigned long);
2261	+	TEST_SKIP_INSTRUCTION(signed char);
2262	+	TEST_SKIP_INSTRUCTION(signed short);
2263	+	TEST_SKIP_INSTRUCTION(signed int);
2264	+	TEST_SKIP_INSTRUCTION(signed long);
2265	+	L_e_region2:
2266	+
2267	+	if (!arch_insn_skipper_tests())
2268	+	return 20;
2269		#endif
2270
2271		vm_exit();

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