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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 1.44 by gbeauche, 2004-01-21T23:14:28Z

#	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) 1997-2004 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 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		}
178
179		// Calculate effective address
#	Line 214 | Line 220 | static void powerpc_decode_instruction(i
220		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
221		#endif
222		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
223	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t *sip, void *scp
224	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sip, scp
225		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
226	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
226	>	#if (defined(sgi) || defined(__sgi))
227	>	#include <ucontext.h>
228	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
229	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)SIGSEGV_CONTEXT_REGS[CTX_EPC]
230	>	#if (defined(mips) || defined(__mips))
231	>	#define SIGSEGV_REGISTER_FILE                   SIGSEGV_CONTEXT_REGS
232	>	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
233	>	#endif
234	>	#endif
235	>	#if defined(__sun__)
236	>	#if (defined(sparc) || defined(__sparc__))
237	>	#include <sys/stack.h>
238	>	#include <sys/regset.h>
239	>	#include <sys/ucontext.h>
240	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
241	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[REG_PC]
242	>	#define SIGSEGV_SPARC_GWINDOWS                  (((ucontext_t *)scp)->uc_mcontext.gwins)
243	>	#define SIGSEGV_SPARC_RWINDOW                   (struct rwindow *)((char *)SIGSEGV_CONTEXT_REGS[REG_SP] + STACK_BIAS)
244	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)SIGSEGV_CONTEXT_REGS), SIGSEGV_SPARC_GWINDOWS, SIGSEGV_SPARC_RWINDOW
245	>	#define SIGSEGV_SKIP_INSTRUCTION                sparc_skip_instruction
246	>	#endif
247	>	#endif
248	>	#if defined(__FreeBSD__)
249		#if (defined(i386) || defined(__i386__))
250		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
251	<	#define SIGSEGV_REGISTER_FILE                   ((unsigned int *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
251	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
252		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
253		#endif
254		#endif
#	Line 227 | Line 257 | static void powerpc_decode_instruction(i
257		#include <sys/ucontext.h>
258		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
259		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
260	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)SIGSEGV_CONTEXT_REGS
260	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
261		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
262		#endif
263		#if (defined(x86_64) || defined(__x86_64__))
#	Line 235 | Line 265 | static void powerpc_decode_instruction(i
265		#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
266		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
267		#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
268	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
269		#endif
270		#if (defined(ia64) || defined(__ia64__))
271		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
#	Line 246 | Line 277 | static void powerpc_decode_instruction(i
277		#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
278		#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
279		#endif
280	+	#if (defined(hppa) || defined(__hppa__))
281	+	#undef  SIGSEGV_FAULT_ADDRESS
282	+	#define SIGSEGV_FAULT_ADDRESS                   sip->si_ptr
283	+	#endif
284	+	#if (defined(arm) || defined(__arm__))
285	+	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
286	+	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
287	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.arm_pc)
288	+	#define SIGSEGV_REGISTER_FILE                   (&SIGSEGV_CONTEXT_REGS.arm_r0)
289	+	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
290	+	#endif
291		#endif
292		#endif
293
#	Line 256 | Line 298 | static void powerpc_decode_instruction(i
298		#if (defined(i386) || defined(__i386__))
299		#include <asm/sigcontext.h>
300		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
301	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
302	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
303	<	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)(&scs)
301	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
302	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
303	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
304	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
305	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
306		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
307		#endif
308		#if (defined(sparc) || defined(__sparc__))
309		#include <asm/sigcontext.h>
310		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
311	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
312		#define SIGSEGV_FAULT_ADDRESS                   addr
313		#endif
314		#if (defined(powerpc) || defined(__powerpc__))
315		#include <asm/sigcontext.h>
316		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
317	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
318		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
319		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
320		#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
#	Line 277 | Line 323 | static void powerpc_decode_instruction(i
323		#if (defined(alpha) || defined(__alpha__))
324		#include <asm/sigcontext.h>
325		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
326	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
327		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
328		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
329	<
330	<	// From Boehm's GC 6.0alpha8
331	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
332	<	{
333	<	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
334	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
335	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
336	<	return (sigsegv_address_t)fault_address;
337	<	}
329	>	#endif
330	>	#if (defined(arm) || defined(__arm__))
331	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int r1, int r2, int r3, struct sigcontext sc
332	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
333	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &sc
334	>	#define SIGSEGV_FAULT_ADDRESS                   scp->fault_address
335	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->arm_pc
336	>	#define SIGSEGV_REGISTER_FILE                   &scp->arm_r0
337	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
338		#endif
339		#endif
340
341		// Irix 5 or 6 on MIPS
342	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
342	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
343		#include <ucontext.h>
344		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
345	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
345	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
346	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
347	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
348		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
349		#endif
350
351		// HP-UX
352		#if (defined(hpux) || defined(__hpux__))
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                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
356		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
357		#endif
#	Line 310 | Line 360 | static sigsegv_address_t get_fault_addre
360		#if defined(__osf__)
361		#include <ucontext.h>
362		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
363	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
364		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
365		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
366		#endif
#	Line 317 | Line 368 | static sigsegv_address_t get_fault_addre
368		// AIX
369		#if defined(_AIX)
370		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
371	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
372		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
373		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
374		#endif
375
376	<	// NetBSD or FreeBSD
377	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
376	>	// NetBSD
377	>	#if defined(__NetBSD__)
378		#if (defined(m68k) || defined(__m68k__))
379		#include <m68k/frame.h>
380		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
381	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
382		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
383		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
384
#	Line 349 | Line 402 | static sigsegv_address_t get_fault_addre
402		}
403		return (sigsegv_address_t)fault_addr;
404		}
405	<	#else
406	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
407	<	#define SIGSEGV_FAULT_ADDRESS                   addr
405	>	#endif
406	>	#if (defined(alpha) || defined(__alpha__))
407	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
408	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
409	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
410	>	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
411	>	#endif
412	>	#if (defined(i386) || defined(__i386__))
413	>	#error "FIXME: need to decode instruction and compute EA"
414	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
415	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
416	>	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
417	>	#endif
418	>	#endif
419	>	#if defined(__FreeBSD__)
420	>	#if (defined(i386) || defined(__i386__))
421		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
422	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
423	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
424	+	#define SIGSEGV_FAULT_ADDRESS                   addr
425	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
426	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
427	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
428	+	#endif
429	+	#if (defined(alpha) || defined(__alpha__))
430	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
431	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, char *addr, struct sigcontext *scp
432	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, addr, scp
433	+	#define SIGSEGV_FAULT_ADDRESS                   addr
434	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
435	+	#endif
436		#endif
437	+
438	+	// Extract fault address out of a sigcontext
439	+	#if (defined(alpha) || defined(__alpha__))
440	+	// From Boehm's GC 6.0alpha8
441	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
442	+	{
443	+	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
444	+	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
445	+	fault_address += (signed long)(signed short)(instruction & 0xffff);
446	+	return (sigsegv_address_t)fault_address;
447	+	}
448		#endif
449
450	<	// MacOS X
450	>
451	>	// MacOS X, not sure which version this works in. Under 10.1
452	>	// vm_protect does not appear to work from a signal handler. Under
453	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
454	>	// field is the address of the faulting instruction and not the
455	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
456	>	// case with Mach exception handlers there is a way to do what this
457	>	// was meant to do.
458	>	#ifndef HAVE_MACH_EXCEPTIONS
459		#if defined(__APPLE__) && defined(__MACH__)
460		#if (defined(ppc) || defined(__ppc__))
461		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
462	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
463		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
464		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
465		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
#	Line 379 | Line 479 | static sigsegv_address_t get_fault_addre
479		#endif
480		#endif
481		#endif
482	+	#endif
483	+
484	+	#if HAVE_MACH_EXCEPTIONS
485	+
486	+	// This can easily be extended to other Mach systems, but really who
487	+	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
488	+	// Mach 2.5/3.0?
489	+	#if defined(__APPLE__) && defined(__MACH__)
490	+
491	+	#include <sys/types.h>
492	+	#include <stdlib.h>
493	+	#include <stdio.h>
494	+	#include <pthread.h>
495	+
496	+	/*
497	+	* If you are familiar with MIG then you will understand the frustration
498	+	* that was necessary to get these embedded into C++ code by hand.
499	+	*/
500	+	extern "C" {
501	+	#include <mach/mach.h>
502	+	#include <mach/mach_error.h>
503	+
504	+	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
505	+	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
506	+	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
507	+	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
508	+	exception_type_t, exception_data_t, mach_msg_type_number_t);
509	+	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
510	+	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
511	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
512	+	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
513	+	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
514	+	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
515	+	}
516	+
517	+	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
518	+	#define HANDLER_COUNT 64
519	+
520	+	// structure to tuck away existing exception handlers
521	+	typedef struct _ExceptionPorts {
522	+	mach_msg_type_number_t maskCount;
523	+	exception_mask_t masks[HANDLER_COUNT];
524	+	exception_handler_t handlers[HANDLER_COUNT];
525	+	exception_behavior_t behaviors[HANDLER_COUNT];
526	+	thread_state_flavor_t flavors[HANDLER_COUNT];
527	+	} ExceptionPorts;
528	+
529	+	// exception handler thread
530	+	static pthread_t exc_thread;
531	+
532	+	// place where old exception handler info is stored
533	+	static ExceptionPorts ports;
534	+
535	+	// our exception port
536	+	static mach_port_t _exceptionPort = MACH_PORT_NULL;
537	+
538	+	#define MACH_CHECK_ERROR(name,ret) \
539	+	if (ret != KERN_SUCCESS) { \
540	+	mach_error(#name, ret); \
541	+	exit (1); \
542	+	}
543	+
544	+	#define SIGSEGV_FAULT_ADDRESS                   code[1]
545	+	#define SIGSEGV_FAULT_INSTRUCTION               get_fault_instruction(thread, state)
546	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
547	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
548	+	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
549	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
550	+	#define SIGSEGV_REGISTER_FILE                   &state->srr0, &state->r0
551	+
552	+	// Given a suspended thread, stuff the current instruction and
553	+	// registers into state.
554	+	//
555	+	// It would have been nice to have this be ppc/x86 independant which
556	+	// could have been done easily with a thread_state_t instead of
557	+	// ppc_thread_state_t, but because of the way this is called it is
558	+	// easier to do it this way.
559	+	#if (defined(ppc) || defined(__ppc__))
560	+	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
561	+	{
562	+	kern_return_t krc;
563	+	mach_msg_type_number_t count;
564	+
565	+	count = MACHINE_THREAD_STATE_COUNT;
566	+	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
567	+	MACH_CHECK_ERROR (thread_get_state, krc);
568	+
569	+	return (sigsegv_address_t)state->srr0;
570	+	}
571	+	#endif
572	+
573	+	// Since there can only be one exception thread running at any time
574	+	// this is not a problem.
575	+	#define MSG_SIZE 512
576	+	static char msgbuf[MSG_SIZE];
577	+	static char replybuf[MSG_SIZE];
578	+
579	+	/*
580	+	* This is the entry point for the exception handler thread. The job
581	+	* of this thread is to wait for exception messages on the exception
582	+	* port that was setup beforehand and to pass them on to exc_server.
583	+	* exc_server is a MIG generated function that is a part of Mach.
584	+	* Its job is to decide what to do with the exception message. In our
585	+	* case exc_server calls catch_exception_raise on our behalf. After
586	+	* exc_server returns, it is our responsibility to send the reply.
587	+	*/
588	+	static void *
589	+	handleExceptions(void *priv)
590	+	{
591	+	mach_msg_header_t *msg, *reply;
592	+	kern_return_t krc;
593	+
594	+	msg = (mach_msg_header_t *)msgbuf;
595	+	reply = (mach_msg_header_t *)replybuf;
596	+
597	+	for (;;) {
598	+	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
599	+	_exceptionPort, 0, MACH_PORT_NULL);
600	+	MACH_CHECK_ERROR(mach_msg, krc);
601	+
602	+	if (!exc_server(msg, reply)) {
603	+	fprintf(stderr, "exc_server hated the message\n");
604	+	exit(1);
605	+	}
606	+
607	+	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
608	+	msg->msgh_local_port, 0, MACH_PORT_NULL);
609	+	if (krc != KERN_SUCCESS) {
610	+	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
611	+	krc, mach_error_string(krc));
612	+	exit(1);
613	+	}
614	+	}
615	+	}
616	+	#endif
617	+	#endif
618
619
620		/*
#	Line 387 | Line 623 | static sigsegv_address_t get_fault_addre
623
624		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
625		// Decode and skip X86 instruction
626	<	#if (defined(i386) || defined(__i386__))
626	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
627		#if defined(__linux__)
628		enum {
629	+	#if (defined(i386) || defined(__i386__))
630		X86_REG_EIP = 14,
631		X86_REG_EAX = 11,
632		X86_REG_ECX = 10,
#	Line 399 | Line 636 | enum {
636		X86_REG_EBP = 6,
637		X86_REG_ESI = 5,
638		X86_REG_EDI = 4
639	+	#endif
640	+	#if defined(__x86_64__)
641	+	X86_REG_R8  = 0,
642	+	X86_REG_R9  = 1,
643	+	X86_REG_R10 = 2,
644	+	X86_REG_R11 = 3,
645	+	X86_REG_R12 = 4,
646	+	X86_REG_R13 = 5,
647	+	X86_REG_R14 = 6,
648	+	X86_REG_R15 = 7,
649	+	X86_REG_EDI = 8,
650	+	X86_REG_ESI = 9,
651	+	X86_REG_EBP = 10,
652	+	X86_REG_EBX = 11,
653	+	X86_REG_EDX = 12,
654	+	X86_REG_EAX = 13,
655	+	X86_REG_ECX = 14,
656	+	X86_REG_ESP = 15,
657	+	X86_REG_EIP = 16
658	+	#endif
659		};
660		#endif
661		#if defined(__NetBSD__) || defined(__FreeBSD__)
662		enum {
663	+	#if (defined(i386) || defined(__i386__))
664		X86_REG_EIP = 10,
665		X86_REG_EAX = 7,
666		X86_REG_ECX = 6,
#	Line 412 | Line 670 | enum {
670		X86_REG_EBP = 2,
671		X86_REG_ESI = 1,
672		X86_REG_EDI = 0
673	+	#endif
674		};
675		#endif
676		// FIXME: this is partly redundant with the instruction decoding phase
#	Line 448 | Line 707 | static inline int ix86_step_over_modrm(u
707		return offset;
708		}
709
710	<	static bool ix86_skip_instruction(unsigned int * regs)
710	>	static bool ix86_skip_instruction(unsigned long * regs)
711		{
712		unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
713
714		if (eip == 0)
715		return false;
716
717	<	transfer_type_t transfer_type = TYPE_UNKNOWN;
717	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
718		transfer_size_t transfer_size = SIZE_LONG;
719
720		int reg = -1;
721		int len = 0;
722	<
722	>
723	>	#if DEBUG
724	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
725	>	eip, eip[0], eip[1], eip[2], eip[3]);
726	>	#endif
727	>
728		// Operand size prefix
729		if (*eip == 0x66) {
730		eip++;
#	Line 468 | Line 732 | static bool ix86_skip_instruction(unsign
732		transfer_size = SIZE_WORD;
733		}
734
735	+	// REX prefix
736	+	#if defined(__x86_64__)
737	+	struct rex_t {
738	+	unsigned char W;
739	+	unsigned char R;
740	+	unsigned char X;
741	+	unsigned char B;
742	+	};
743	+	rex_t rex = { 0, 0, 0, 0 };
744	+	bool has_rex = false;
745	+	if ((*eip & 0xf0) == 0x40) {
746	+	has_rex = true;
747	+	const unsigned char b = *eip;
748	+	rex.W = b & (1 << 3);
749	+	rex.R = b & (1 << 2);
750	+	rex.X = b & (1 << 1);
751	+	rex.B = b & (1 << 0);
752	+	#if DEBUG
753	+	printf("REX: %c,%c,%c,%c\n",
754	+	rex.W ? 'W' : '_',
755	+	rex.R ? 'R' : '_',
756	+	rex.X ? 'X' : '_',
757	+	rex.B ? 'B' : '_');
758	+	#endif
759	+	eip++;
760	+	len++;
761	+	if (rex.W)
762	+	transfer_size = SIZE_QUAD;
763	+	}
764	+	#else
765	+	const bool has_rex = false;
766	+	#endif
767	+
768		// Decode instruction
769		switch (eip[0]) {
770		case 0x0f:
#	Line 477 | Line 774 | static bool ix86_skip_instruction(unsign
774		switch (eip[2] & 0xc0) {
775		case 0x80:
776		reg = (eip[2] >> 3) & 7;
777	<	transfer_type = TYPE_LOAD;
777	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
778		break;
779		case 0x40:
780		reg = (eip[2] >> 3) & 7;
781	<	transfer_type = TYPE_LOAD;
781	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
782		break;
783		case 0x00:
784		reg = (eip[2] >> 3) & 7;
785	<	transfer_type = TYPE_LOAD;
785	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
786		break;
787		}
788		len += 3 + ix86_step_over_modrm(eip + 2);
#	Line 498 | Line 795 | static bool ix86_skip_instruction(unsign
795		switch (eip[1] & 0xc0) {
796		case 0x80:
797		reg = (eip[1] >> 3) & 7;
798	<	transfer_type = TYPE_LOAD;
798	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
799		break;
800		case 0x40:
801		reg = (eip[1] >> 3) & 7;
802	<	transfer_type = TYPE_LOAD;
802	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
803		break;
804		case 0x00:
805		reg = (eip[1] >> 3) & 7;
806	<	transfer_type = TYPE_LOAD;
806	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
807		break;
808		}
809		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 517 | Line 814 | static bool ix86_skip_instruction(unsign
814		switch (eip[1] & 0xc0) {
815		case 0x80:
816		reg = (eip[1] >> 3) & 7;
817	<	transfer_type = TYPE_STORE;
817	>	transfer_type = SIGSEGV_TRANSFER_STORE;
818		break;
819		case 0x40:
820		reg = (eip[1] >> 3) & 7;
821	<	transfer_type = TYPE_STORE;
821	>	transfer_type = SIGSEGV_TRANSFER_STORE;
822		break;
823		case 0x00:
824		reg = (eip[1] >> 3) & 7;
825	<	transfer_type = TYPE_STORE;
825	>	transfer_type = SIGSEGV_TRANSFER_STORE;
826		break;
827		}
828		len += 2 + ix86_step_over_modrm(eip + 1);
829		break;
830		}
831
832	<	if (transfer_type == TYPE_UNKNOWN) {
832	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
833		// Unknown machine code, let it crash. Then patch the decoder
834		return false;
835		}
836
837	<	if (transfer_type == TYPE_LOAD && reg != -1) {
838	<	static const int x86_reg_map[8] = {
837	>	#if defined(__x86_64__)
838	>	if (rex.R)
839	>	reg += 8;
840	>	#endif
841	>
842	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
843	>	static const int x86_reg_map[] = {
844		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
845	<	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
845	>	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
846	>	#if defined(__x86_64__)
847	>	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
848	>	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
849	>	#endif
850		};
851
852	<	if (reg < 0 || reg >= 8)
852	>	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
853		return false;
854
855	+	// Set 0 to the relevant register part
856	+	// NOTE: this is only valid for MOV alike instructions
857		int rloc = x86_reg_map[reg];
858		switch (transfer_size) {
859		case SIZE_BYTE:
860	<	regs[rloc] = (regs[rloc] & ~0xff);
860	>	if (has_rex || reg < 4)
861	>	regs[rloc] = (regs[rloc] & ~0x00ffL);
862	>	else {
863	>	rloc = x86_reg_map[reg - 4];
864	>	regs[rloc] = (regs[rloc] & ~0xff00L);
865	>	}
866		break;
867		case SIZE_WORD:
868	<	regs[rloc] = (regs[rloc] & ~0xffff);
868	>	regs[rloc] = (regs[rloc] & ~0xffffL);
869		break;
870		case SIZE_LONG:
871	+	case SIZE_QUAD: // zero-extension
872		regs[rloc] = 0;
873		break;
874		}
#	Line 562 | Line 876 | static bool ix86_skip_instruction(unsign
876
877		#if DEBUG
878		printf("%08x: %s %s access", regs[X86_REG_EIP],
879	<	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
880	<	transfer_type == TYPE_LOAD ? "read" : "write");
879	>	transfer_size == SIZE_BYTE ? "byte" :
880	>	transfer_size == SIZE_WORD ? "word" :
881	>	transfer_size == SIZE_LONG ? "long" :
882	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
883	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
884
885		if (reg != -1) {
886	<	static const char * x86_reg_str_map[8] = {
887	<	"eax", "ecx", "edx", "ebx",
888	<	"esp", "ebp", "esi", "edi"
886	>	static const char * x86_byte_reg_str_map[] = {
887	>	"al",   "cl",   "dl",   "bl",
888	>	"spl",  "bpl",  "sil",  "dil",
889	>	"r8b",  "r9b",  "r10b", "r11b",
890	>	"r12b", "r13b", "r14b", "r15b",
891	>	"ah",   "ch",   "dh",   "bh",
892	>	};
893	>	static const char * x86_word_reg_str_map[] = {
894	>	"ax",   "cx",   "dx",   "bx",
895	>	"sp",   "bp",   "si",   "di",
896	>	"r8w",  "r9w",  "r10w", "r11w",
897	>	"r12w", "r13w", "r14w", "r15w",
898	>	};
899	>	static const char *x86_long_reg_str_map[] = {
900	>	"eax",  "ecx",  "edx",  "ebx",
901	>	"esp",  "ebp",  "esi",  "edi",
902	>	"r8d",  "r9d",  "r10d", "r11d",
903	>	"r12d", "r13d", "r14d", "r15d",
904		};
905	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
905	>	static const char *x86_quad_reg_str_map[] = {
906	>	"rax", "rcx", "rdx", "rbx",
907	>	"rsp", "rbp", "rsi", "rdi",
908	>	"r8",  "r9",  "r10", "r11",
909	>	"r12", "r13", "r14", "r15",
910	>	};
911	>	const char * reg_str = NULL;
912	>	switch (transfer_size) {
913	>	case SIZE_BYTE:
914	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
915	>	break;
916	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
917	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
918	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
919	>	}
920	>	if (reg_str)
921	>	printf(" %s register %%%s",
922	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
923	>	reg_str);
924		}
925		printf(", %d bytes instruction\n", len);
926		#endif
#	Line 587 | Line 937 | static bool powerpc_skip_instruction(uns
937		instruction_t instr;
938		powerpc_decode_instruction(&instr, *nip_p, regs);
939
940	<	if (instr.transfer_type == TYPE_UNKNOWN) {
940	>	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
941		// Unknown machine code, let it crash. Then patch the decoder
942		return false;
943		}
#	Line 595 | Line 945 | static bool powerpc_skip_instruction(uns
945		#if DEBUG
946		printf("%08x: %s %s access", *nip_p,
947		instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
948	<	instr.transfer_type == TYPE_LOAD ? "read" : "write");
948	>	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
949
950		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
951		printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
952	<	if (instr.transfer_type == TYPE_LOAD)
952	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
953		printf(" r%d (rd = 0)\n", instr.rd);
954		#endif
955
956		if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
957		regs[instr.ra] = instr.addr;
958	<	if (instr.transfer_type == TYPE_LOAD)
958	>	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
959		regs[instr.rd] = 0;
960
961		*nip_p += 4;
962		return true;
963		}
964		#endif
965	+
966	+	// Decode and skip MIPS instruction
967	+	#if (defined(mips) || defined(__mips))
968	+	enum {
969	+	#if (defined(sgi) || defined(__sgi))
970	+	MIPS_REG_EPC = 35,
971	+	#endif
972	+	};
973	+	static bool mips_skip_instruction(greg_t * regs)
974	+	{
975	+	unsigned int * epc = (unsigned int *)(unsigned long)regs[MIPS_REG_EPC];
976	+
977	+	if (epc == 0)
978	+	return false;
979	+
980	+	#if DEBUG
981	+	printf("IP: %p [%08x]\n", epc, epc[0]);
982	+	#endif
983	+
984	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
985	+	transfer_size_t transfer_size = SIZE_LONG;
986	+	int direction = 0;
987	+
988	+	const unsigned int opcode = epc[0];
989	+	switch (opcode >> 26) {
990	+	case 32: // Load Byte
991	+	case 36: // Load Byte Unsigned
992	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
993	+	transfer_size = SIZE_BYTE;
994	+	break;
995	+	case 33: // Load Halfword
996	+	case 37: // Load Halfword Unsigned
997	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
998	+	transfer_size = SIZE_WORD;
999	+	break;
1000	+	case 35: // Load Word
1001	+	case 39: // Load Word Unsigned
1002	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1003	+	transfer_size = SIZE_LONG;
1004	+	break;
1005	+	case 34: // Load Word Left
1006	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1007	+	transfer_size = SIZE_LONG;
1008	+	direction = -1;
1009	+	break;
1010	+	case 38: // Load Word Right
1011	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1012	+	transfer_size = SIZE_LONG;
1013	+	direction = 1;
1014	+	break;
1015	+	case 55: // Load Doubleword
1016	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1017	+	transfer_size = SIZE_QUAD;
1018	+	break;
1019	+	case 26: // Load Doubleword Left
1020	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1021	+	transfer_size = SIZE_QUAD;
1022	+	direction = -1;
1023	+	break;
1024	+	case 27: // Load Doubleword Right
1025	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1026	+	transfer_size = SIZE_QUAD;
1027	+	direction = 1;
1028	+	break;
1029	+	case 40: // Store Byte
1030	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1031	+	transfer_size = SIZE_BYTE;
1032	+	break;
1033	+	case 41: // Store Halfword
1034	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1035	+	transfer_size = SIZE_WORD;
1036	+	break;
1037	+	case 43: // Store Word
1038	+	case 42: // Store Word Left
1039	+	case 46: // Store Word Right
1040	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1041	+	transfer_size = SIZE_LONG;
1042	+	break;
1043	+	case 63: // Store Doubleword
1044	+	case 44: // Store Doubleword Left
1045	+	case 45: // Store Doubleword Right
1046	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1047	+	transfer_size = SIZE_QUAD;
1048	+	break;
1049	+	/* Misc instructions unlikely to be used within CPU emulators */
1050	+	case 48: // Load Linked Word
1051	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1052	+	transfer_size = SIZE_LONG;
1053	+	break;
1054	+	case 52: // Load Linked Doubleword
1055	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1056	+	transfer_size = SIZE_QUAD;
1057	+	break;
1058	+	case 56: // Store Conditional Word
1059	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1060	+	transfer_size = SIZE_LONG;
1061	+	break;
1062	+	case 60: // Store Conditional Doubleword
1063	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1064	+	transfer_size = SIZE_QUAD;
1065	+	break;
1066	+	}
1067	+
1068	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1069	+	// Unknown machine code, let it crash. Then patch the decoder
1070	+	return false;
1071	+	}
1072	+
1073	+	// Zero target register in case of a load operation
1074	+	const int reg = (opcode >> 16) & 0x1f;
1075	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
1076	+	if (direction == 0)
1077	+	regs[reg] = 0;
1078	+	else {
1079	+	// FIXME: untested code
1080	+	unsigned long ea = regs[(opcode >> 21) & 0x1f];
1081	+	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
1082	+	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
1083	+	unsigned long value;
1084	+	if (direction > 0) {
1085	+	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
1086	+	value = regs[reg] & rmask;
1087	+	}
1088	+	else {
1089	+	const unsigned long lmask = (1L << (offset * 8)) - 1;
1090	+	value = regs[reg] & lmask;
1091	+	}
1092	+	// restore most significant bits
1093	+	if (transfer_size == SIZE_LONG)
1094	+	value = (signed long)(signed int)value;
1095	+	regs[reg] = value;
1096	+	}
1097	+	}
1098	+
1099	+	#if DEBUG
1100	+	#if (defined(_ABIN32) || defined(_ABI64))
1101	+	static const char * mips_gpr_names[32] = {
1102	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1103	+	"t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
1104	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1105	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1106	+	};
1107	+	#else
1108	+	static const char * mips_gpr_names[32] = {
1109	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1110	+	"a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
1111	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1112	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1113	+	};
1114	+	#endif
1115	+	printf("%s %s register %s\n",
1116	+	transfer_size == SIZE_BYTE ? "byte" :
1117	+	transfer_size == SIZE_WORD ? "word" :
1118	+	transfer_size == SIZE_LONG ? "long" :
1119	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1120	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1121	+	mips_gpr_names[reg]);
1122		#endif
1123
1124	+	regs[MIPS_REG_EPC] += 4;
1125	+	return true;
1126	+	}
1127	+	#endif
1128	+
1129	+	// Decode and skip SPARC instruction
1130	+	#if (defined(sparc) || defined(__sparc__))
1131	+	enum {
1132	+	#if (defined(__sun__))
1133	+	SPARC_REG_G1 = REG_G1,
1134	+	SPARC_REG_O0 = REG_O0,
1135	+	SPARC_REG_PC = REG_PC,
1136	+	#endif
1137	+	};
1138	+	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
1139	+	{
1140	+	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
1141	+
1142	+	if (pc == 0)
1143	+	return false;
1144	+
1145	+	#if DEBUG
1146	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1147	+	#endif
1148	+
1149	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1150	+	transfer_size_t transfer_size = SIZE_LONG;
1151	+	bool register_pair = false;
1152	+
1153	+	const unsigned int opcode = pc[0];
1154	+	if ((opcode >> 30) != 3)
1155	+	return false;
1156	+	switch ((opcode >> 19) & 0x3f) {
1157	+	case 9: // Load Signed Byte
1158	+	case 1: // Load Unsigned Byte
1159	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1160	+	transfer_size = SIZE_BYTE;
1161	+	break;
1162	+	case 10:// Load Signed Halfword
1163	+	case 2: // Load Unsigned Word
1164	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1165	+	transfer_size = SIZE_WORD;
1166	+	break;
1167	+	case 8: // Load Word
1168	+	case 0: // Load Unsigned Word
1169	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1170	+	transfer_size = SIZE_LONG;
1171	+	break;
1172	+	case 11:// Load Extended Word
1173	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1174	+	transfer_size = SIZE_QUAD;
1175	+	break;
1176	+	case 3: // Load Doubleword
1177	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1178	+	transfer_size = SIZE_LONG;
1179	+	register_pair = true;
1180	+	break;
1181	+	case 5: // Store Byte
1182	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1183	+	transfer_size = SIZE_BYTE;
1184	+	break;
1185	+	case 6: // Store Halfword
1186	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1187	+	transfer_size = SIZE_WORD;
1188	+	break;
1189	+	case 4: // Store Word
1190	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1191	+	transfer_size = SIZE_LONG;
1192	+	break;
1193	+	case 14:// Store Extended Word
1194	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1195	+	transfer_size = SIZE_QUAD;
1196	+	break;
1197	+	case 7: // Store Doubleword
1198	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1199	+	transfer_size = SIZE_WORD;
1200	+	register_pair = true;
1201	+	break;
1202	+	}
1203	+
1204	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1205	+	// Unknown machine code, let it crash. Then patch the decoder
1206	+	return false;
1207	+	}
1208	+
1209	+	// Zero target register in case of a load operation
1210	+	const int reg = (opcode >> 25) & 0x1f;
1211	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
1212	+	// FIXME: code to handle local & input registers is not tested
1213	+	if (reg >= 1 && reg <= 7) {
1214	+	// global registers
1215	+	regs[reg - 1 + SPARC_REG_G1] = 0;
1216	+	}
1217	+	else if (reg >= 8 && reg <= 15) {
1218	+	// output registers
1219	+	regs[reg - 8 + SPARC_REG_O0] = 0;
1220	+	}
1221	+	else if (reg >= 16 && reg <= 23) {
1222	+	// local registers (in register windows)
1223	+	if (gwins)
1224	+	gwins->wbuf->rw_local[reg - 16] = 0;
1225	+	else
1226	+	rwin->rw_local[reg - 16] = 0;
1227	+	}
1228	+	else {
1229	+	// input registers (in register windows)
1230	+	if (gwins)
1231	+	gwins->wbuf->rw_in[reg - 24] = 0;
1232	+	else
1233	+	rwin->rw_in[reg - 24] = 0;
1234	+	}
1235	+	}
1236	+
1237	+	#if DEBUG
1238	+	static const char * reg_names[] = {
1239	+	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
1240	+	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
1241	+	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
1242	+	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
1243	+	};
1244	+	printf("%s %s register %s\n",
1245	+	transfer_size == SIZE_BYTE ? "byte" :
1246	+	transfer_size == SIZE_WORD ? "word" :
1247	+	transfer_size == SIZE_LONG ? "long" :
1248	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1249	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1250	+	reg_names[reg]);
1251	+	#endif
1252	+
1253	+	regs[SPARC_REG_PC] += 4;
1254	+	return true;
1255	+	}
1256	+	#endif
1257	+	#endif
1258	+
1259	+	// Decode and skip ARM instruction
1260	+	#if (defined(arm) || defined(__arm__))
1261	+	enum {
1262	+	#if (defined(__linux__))
1263	+	ARM_REG_PC = 15,
1264	+	ARM_REG_CPSR = 16
1265	+	#endif
1266	+	};
1267	+	static bool arm_skip_instruction(unsigned long * regs)
1268	+	{
1269	+	unsigned int * pc = (unsigned int *)regs[ARM_REG_PC];
1270	+
1271	+	if (pc == 0)
1272	+	return false;
1273	+
1274	+	#if DEBUG
1275	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1276	+	#endif
1277	+
1278	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1279	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
1280	+	enum { op_sdt = 1, op_sdth = 2 };
1281	+	int op = 0;
1282	+
1283	+	// Handle load/store instructions only
1284	+	const unsigned int opcode = pc[0];
1285	+	switch ((opcode >> 25) & 7) {
1286	+	case 0: // Halfword and Signed Data Transfer (LDRH, STRH, LDRSB, LDRSH)
1287	+	op = op_sdth;
1288	+	// Determine transfer size (S/H bits)
1289	+	switch ((opcode >> 5) & 3) {
1290	+	case 0: // SWP instruction
1291	+	break;
1292	+	case 1: // Unsigned halfwords
1293	+	case 3: // Signed halfwords
1294	+	transfer_size = SIZE_WORD;
1295	+	break;
1296	+	case 2: // Signed byte
1297	+	transfer_size = SIZE_BYTE;
1298	+	break;
1299	+	}
1300	+	break;
1301	+	case 2:
1302	+	case 3: // Single Data Transfer (LDR, STR)
1303	+	op = op_sdt;
1304	+	// Determine transfer size (B bit)
1305	+	if (((opcode >> 22) & 1) == 1)
1306	+	transfer_size = SIZE_BYTE;
1307	+	else
1308	+	transfer_size = SIZE_LONG;
1309	+	break;
1310	+	default:
1311	+	// FIXME: support load/store mutliple?
1312	+	return false;
1313	+	}
1314	+
1315	+	// Check for invalid transfer size (SWP instruction?)
1316	+	if (transfer_size == SIZE_UNKNOWN)
1317	+	return false;
1318	+
1319	+	// Determine transfer type (L bit)
1320	+	if (((opcode >> 20) & 1) == 1)
1321	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1322	+	else
1323	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1324	+
1325	+	// Compute offset
1326	+	int offset;
1327	+	if (((opcode >> 25) & 1) == 0) {
1328	+	if (op == op_sdt)
1329	+	offset = opcode & 0xfff;
1330	+	else if (op == op_sdth) {
1331	+	int rm = opcode & 0xf;
1332	+	if (((opcode >> 22) & 1) == 0) {
1333	+	// register offset
1334	+	offset = regs[rm];
1335	+	}
1336	+	else {
1337	+	// immediate offset
1338	+	offset = ((opcode >> 4) & 0xf0) | (opcode & 0x0f);
1339	+	}
1340	+	}
1341	+	}
1342	+	else {
1343	+	const int rm = opcode & 0xf;
1344	+	const int sh = (opcode >> 7) & 0x1f;
1345	+	if (((opcode >> 4) & 1) == 1) {
1346	+	// we expect only legal load/store instructions
1347	+	printf("FATAL: invalid shift operand\n");
1348	+	return false;
1349	+	}
1350	+	const unsigned int v = regs[rm];
1351	+	switch ((opcode >> 5) & 3) {
1352	+	case 0: // logical shift left
1353	+	offset = sh ? v << sh : v;
1354	+	break;
1355	+	case 1: // logical shift right
1356	+	offset = sh ? v >> sh : 0;
1357	+	break;
1358	+	case 2: // arithmetic shift right
1359	+	if (sh)
1360	+	offset = ((signed int)v) >> sh;
1361	+	else
1362	+	offset = (v & 0x80000000) ? 0xffffffff : 0;
1363	+	break;
1364	+	case 3: // rotate right
1365	+	if (sh)
1366	+	offset = (v >> sh) | (v << (32 - sh));
1367	+	else
1368	+	offset = (v >> 1) | ((regs[ARM_REG_CPSR] << 2) & 0x80000000);
1369	+	break;
1370	+	}
1371	+	}
1372	+	if (((opcode >> 23) & 1) == 0)
1373	+	offset = -offset;
1374	+
1375	+	int rd = (opcode >> 12) & 0xf;
1376	+	int rn = (opcode >> 16) & 0xf;
1377	+	#if DEBUG
1378	+	static const char * reg_names[] = {
1379	+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1380	+	"r9", "r9", "sl", "fp", "ip", "sp", "lr", "pc"
1381	+	};
1382	+	printf("%s %s register %s\n",
1383	+	transfer_size == SIZE_BYTE ? "byte" :
1384	+	transfer_size == SIZE_WORD ? "word" :
1385	+	transfer_size == SIZE_LONG ? "long" : "unknown",
1386	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1387	+	reg_names[rd]);
1388	+	#endif
1389	+
1390	+	unsigned int base = regs[rn];
1391	+	if (((opcode >> 24) & 1) == 1)
1392	+	base += offset;
1393	+
1394	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD)
1395	+	regs[rd] = 0;
1396	+
1397	+	if (((opcode >> 24) & 1) == 0)                // post-index addressing
1398	+	regs[rn] += offset;
1399	+	else if (((opcode >> 21) & 1) == 1)   // write-back address into base
1400	+	regs[rn] = base;
1401	+
1402	+	regs[ARM_REG_PC] += 4;
1403	+	return true;
1404	+	}
1405	+	#endif
1406	+
1407	+
1408		// Fallbacks
1409		#ifndef SIGSEGV_FAULT_INSTRUCTION
1410		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
1411		#endif
1412	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
1413	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
1414	+	#endif
1415	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
1416	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
1417	+	#endif
1418
1419		// SIGSEGV recovery supported ?
1420		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 629 | Line 1426 | static bool powerpc_skip_instruction(uns
1426		*  SIGSEGV global handler
1427		*/
1428
1429	<	#ifdef HAVE_SIGSEGV_RECOVERY
1430	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1429	>	#if defined(HAVE_SIGSEGV_RECOVERY) || defined(HAVE_MACH_EXCEPTIONS)
1430	>	// This function handles the badaccess to memory.
1431	>	// It is called from the signal handler or the exception handler.
1432	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
1433		{
1434		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
1435		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
637	–	bool fault_recovered = false;
1436
1437		// Call user's handler and reinstall the global handler, if required
1438	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
1439	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1440	<	sigsegv_do_install_handler(sig);
1438	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
1439	>	case SIGSEGV_RETURN_SUCCESS:
1440	>	return true;
1441	>
1442	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1443	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
1444	>	// Call the instruction skipper with the register file
1445	>	// available
1446	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
1447	>	#ifdef HAVE_MACH_EXCEPTIONS
1448	>	// Unlike UNIX signals where the thread state
1449	>	// is modified off of the stack, in Mach we
1450	>	// need to actually call thread_set_state to
1451	>	// have the register values updated.
1452	>	kern_return_t krc;
1453	>
1454	>	krc = thread_set_state(thread,
1455	>	MACHINE_THREAD_STATE, (thread_state_t)state,
1456	>	MACHINE_THREAD_STATE_COUNT);
1457	>	MACH_CHECK_ERROR (thread_get_state, krc);
1458		#endif
1459	<	fault_recovered = true;
1459	>	return true;
1460	>	}
1461	>	break;
1462	>	#endif
1463	>	case SIGSEGV_RETURN_FAILURE:
1464	>	return false;
1465		}
1466	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1467	<	else if (sigsegv_ignore_fault) {
1468	<	// Call the instruction skipper with the register file available
1469	<	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
1470	<	fault_recovered = true;
1466	>
1467	>	// We can't do anything with the fault_address, dump state?
1468	>	if (sigsegv_state_dumper != 0)
1469	>	sigsegv_state_dumper(fault_address, fault_instruction);
1470	>
1471	>	return false;
1472	>	}
1473	>	#endif
1474	>
1475	>
1476	>	/*
1477	>	* There are two mechanisms for handling a bad memory access,
1478	>	* Mach exceptions and UNIX signals. The implementation specific
1479	>	* code appears below. Its reponsibility is to call handle_badaccess
1480	>	* which is the routine that handles the fault in an implementation
1481	>	* agnostic manner. The implementation specific code below is then
1482	>	* reponsible for checking whether handle_badaccess was able
1483	>	* to handle the memory access error and perform any implementation
1484	>	* specific tasks necessary afterwards.
1485	>	*/
1486	>
1487	>	#ifdef HAVE_MACH_EXCEPTIONS
1488	>	/*
1489	>	* We need to forward all exceptions that we do not handle.
1490	>	* This is important, there are many exceptions that may be
1491	>	* handled by other exception handlers. For example debuggers
1492	>	* use exceptions and the exception hander is in another
1493	>	* process in such a case. (Timothy J. Wood states in his
1494	>	* message to the list that he based this code on that from
1495	>	* gdb for Darwin.)
1496	>	*/
1497	>	static inline kern_return_t
1498	>	forward_exception(mach_port_t thread_port,
1499	>	mach_port_t task_port,
1500	>	exception_type_t exception_type,
1501	>	exception_data_t exception_data,
1502	>	mach_msg_type_number_t data_count,
1503	>	ExceptionPorts *oldExceptionPorts)
1504	>	{
1505	>	kern_return_t kret;
1506	>	unsigned int portIndex;
1507	>	mach_port_t port;
1508	>	exception_behavior_t behavior;
1509	>	thread_state_flavor_t flavor;
1510	>	thread_state_t thread_state;
1511	>	mach_msg_type_number_t thread_state_count;
1512	>
1513	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1514	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1515	>	// This handler wants the exception
1516	>	break;
1517	>	}
1518	>	}
1519	>
1520	>	if (portIndex >= oldExceptionPorts->maskCount) {
1521	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1522	>	return KERN_FAILURE;
1523	>	}
1524	>
1525	>	port = oldExceptionPorts->handlers[portIndex];
1526	>	behavior = oldExceptionPorts->behaviors[portIndex];
1527	>	flavor = oldExceptionPorts->flavors[portIndex];
1528	>
1529	>	/*
1530	>	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1531	>	*/
1532	>
1533	>	if (behavior != EXCEPTION_DEFAULT) {
1534	>	thread_state_count = THREAD_STATE_MAX;
1535	>	kret = thread_get_state (thread_port, flavor, thread_state,
1536	>	&thread_state_count);
1537	>	MACH_CHECK_ERROR (thread_get_state, kret);
1538	>	}
1539	>
1540	>	switch (behavior) {
1541	>	case EXCEPTION_DEFAULT:
1542	>	// fprintf(stderr, "forwarding to exception_raise\n");
1543	>	kret = exception_raise(port, thread_port, task_port, exception_type,
1544	>	exception_data, data_count);
1545	>	MACH_CHECK_ERROR (exception_raise, kret);
1546	>	break;
1547	>	case EXCEPTION_STATE:
1548	>	// fprintf(stderr, "forwarding to exception_raise_state\n");
1549	>	kret = exception_raise_state(port, exception_type, exception_data,
1550	>	data_count, &flavor,
1551	>	thread_state, thread_state_count,
1552	>	thread_state, &thread_state_count);
1553	>	MACH_CHECK_ERROR (exception_raise_state, kret);
1554	>	break;
1555	>	case EXCEPTION_STATE_IDENTITY:
1556	>	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1557	>	kret = exception_raise_state_identity(port, thread_port, task_port,
1558	>	exception_type, exception_data,
1559	>	data_count, &flavor,
1560	>	thread_state, thread_state_count,
1561	>	thread_state, &thread_state_count);
1562	>	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1563	>	break;
1564	>	default:
1565	>	fprintf(stderr, "forward_exception got unknown behavior\n");
1566	>	break;
1567	>	}
1568	>
1569	>	if (behavior != EXCEPTION_DEFAULT) {
1570	>	kret = thread_set_state (thread_port, flavor, thread_state,
1571	>	thread_state_count);
1572	>	MACH_CHECK_ERROR (thread_set_state, kret);
1573	>	}
1574	>
1575	>	return KERN_SUCCESS;
1576	>	}
1577	>
1578	>	/*
1579	>	* This is the code that actually handles the exception.
1580	>	* It is called by exc_server. For Darwin 5 Apple changed
1581	>	* this a bit from how this family of functions worked in
1582	>	* Mach. If you are familiar with that it is a little
1583	>	* different. The main variation that concerns us here is
1584	>	* that code is an array of exception specific codes and
1585	>	* codeCount is a count of the number of codes in the code
1586	>	* array. In typical Mach all exceptions have a code
1587	>	* and sub-code. It happens to be the case that for a
1588	>	* EXC_BAD_ACCESS exception the first entry is the type of
1589	>	* bad access that occurred and the second entry is the
1590	>	* faulting address so these entries correspond exactly to
1591	>	* how the code and sub-code are used on Mach.
1592	>	*
1593	>	* This is a MIG interface. No code in Basilisk II should
1594	>	* call this directley. This has to have external C
1595	>	* linkage because that is what exc_server expects.
1596	>	*/
1597	>	kern_return_t
1598	>	catch_exception_raise(mach_port_t exception_port,
1599	>	mach_port_t thread,
1600	>	mach_port_t task,
1601	>	exception_type_t exception,
1602	>	exception_data_t code,
1603	>	mach_msg_type_number_t codeCount)
1604	>	{
1605	>	ppc_thread_state_t state;
1606	>	kern_return_t krc;
1607	>
1608	>	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
1609	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1610	>	return KERN_SUCCESS;
1611		}
1612	+
1613	+	// In Mach we do not need to remove the exception handler.
1614	+	// If we forward the exception, eventually some exception handler
1615	+	// will take care of this exception.
1616	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1617	+
1618	+	return krc;
1619	+	}
1620	+	#endif
1621	+
1622	+	#ifdef HAVE_SIGSEGV_RECOVERY
1623	+	// Handle bad memory accesses with signal handler
1624	+	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1625	+	{
1626	+	// Call handler and reinstall the global handler, if required
1627	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1628	+	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1629	+	sigsegv_do_install_handler(sig);
1630		#endif
1631	+	return;
1632	+	}
1633
1634	<	if (!fault_recovered) {
655	<	// FAIL: reinstall default handler for "safe" crash
1634	>	// Failure: reinstall default handler for "safe" crash
1635		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1636	<	SIGSEGV_ALL_SIGNALS
1636	>	SIGSEGV_ALL_SIGNALS
1637		#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	–	}
1638		}
1639		#endif
1640
#	Line 674 | Line 1648 | static bool sigsegv_do_install_handler(i
1648		{
1649		// Setup SIGSEGV handler to process writes to frame buffer
1650		#ifdef HAVE_SIGACTION
1651	<	struct sigaction vosf_sa;
1652	<	sigemptyset(&vosf_sa.sa_mask);
1653	<	vosf_sa.sa_sigaction = sigsegv_handler;
1654	<	vosf_sa.sa_flags = SA_SIGINFO;
1655	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1651	>	struct sigaction sigsegv_sa;
1652	>	sigemptyset(&sigsegv_sa.sa_mask);
1653	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1654	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1655	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1656		#else
1657		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1658		#endif
#	Line 690 | Line 1664 | static bool sigsegv_do_install_handler(i
1664		{
1665		// Setup SIGSEGV handler to process writes to frame buffer
1666		#ifdef HAVE_SIGACTION
1667	<	struct sigaction vosf_sa;
1668	<	sigemptyset(&vosf_sa.sa_mask);
1669	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1667	>	struct sigaction sigsegv_sa;
1668	>	sigemptyset(&sigsegv_sa.sa_mask);
1669	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1670	>	sigsegv_sa.sa_flags = 0;
1671		#if !EMULATED_68K && defined(__NetBSD__)
1672	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1673	<	vosf_sa.sa_flags = SA_ONSTACK;
699	<	#else
700	<	vosf_sa.sa_flags = 0;
1672	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1673	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1674		#endif
1675	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1675	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1676		#else
1677		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1678		#endif
1679		}
1680		#endif
1681
1682	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1682	>	#if defined(HAVE_MACH_EXCEPTIONS)
1683	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1684		{
1685	<	#ifdef HAVE_SIGSEGV_RECOVERY
1685	>	/*
1686	>	* Except for the exception port functions, this should be
1687	>	* pretty much stock Mach. If later you choose to support
1688	>	* other Mach's besides Darwin, just check for __MACH__
1689	>	* here and __APPLE__ where the actual differences are.
1690	>	*/
1691	>	#if defined(__APPLE__) && defined(__MACH__)
1692	>	if (sigsegv_fault_handler != NULL) {
1693	>	sigsegv_fault_handler = handler;
1694	>	return true;
1695	>	}
1696	>
1697	>	kern_return_t krc;
1698	>
1699	>	// create the the exception port
1700	>	krc = mach_port_allocate(mach_task_self(),
1701	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1702	>	if (krc != KERN_SUCCESS) {
1703	>	mach_error("mach_port_allocate", krc);
1704	>	return false;
1705	>	}
1706	>
1707	>	// add a port send right
1708	>	krc = mach_port_insert_right(mach_task_self(),
1709	>	_exceptionPort, _exceptionPort,
1710	>	MACH_MSG_TYPE_MAKE_SEND);
1711	>	if (krc != KERN_SUCCESS) {
1712	>	mach_error("mach_port_insert_right", krc);
1713	>	return false;
1714	>	}
1715	>
1716	>	// get the old exception ports
1717	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1718	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1719	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1720	>	if (krc != KERN_SUCCESS) {
1721	>	mach_error("thread_get_exception_ports", krc);
1722	>	return false;
1723	>	}
1724	>
1725	>	// set the new exception port
1726	>	//
1727	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1728	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1729	>	// message, but it turns out that in the common case this is not
1730	>	// neccessary. If we need it we can later ask for it from the
1731	>	// suspended thread.
1732	>	//
1733	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1734	>	// counter in the thread state.  The comments in the header file
1735	>	// seem to imply that you can count on the GPR's on an exception
1736	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1737	>	// you have to ask for all of the GPR's anyway just to get the
1738	>	// program counter. In any case because of update effective
1739	>	// address from immediate and update address from effective
1740	>	// addresses of ra and rb modes (as good an name as any for these
1741	>	// addressing modes) used in PPC instructions, you will need the
1742	>	// GPR state anyway.
1743	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1744	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1745	>	if (krc != KERN_SUCCESS) {
1746	>	mach_error("thread_set_exception_ports", krc);
1747	>	return false;
1748	>	}
1749	>
1750	>	// create the exception handler thread
1751	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1752	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1753	>	return false;
1754	>	}
1755	>
1756	>	// do not care about the exception thread any longer, let is run standalone
1757	>	(void)pthread_detach(exc_thread);
1758	>
1759		sigsegv_fault_handler = handler;
1760	+	return true;
1761	+	#else
1762	+	return false;
1763	+	#endif
1764	+	}
1765	+	#endif
1766	+
1767	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1768	+	{
1769	+	#if defined(HAVE_SIGSEGV_RECOVERY)
1770		bool success = true;
1771		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1772		SIGSEGV_ALL_SIGNALS
1773		#undef FAULT_HANDLER
1774	+	if (success)
1775	+	sigsegv_fault_handler = handler;
1776		return success;
1777	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1778	+	return sigsegv_do_install_handler(handler);
1779		#else
1780		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1781		return false;
#	Line 728 | Line 1789 | bool sigsegv_install_handler(sigsegv_fau
1789
1790		void sigsegv_deinstall_handler(void)
1791		{
1792	+	// We do nothing for Mach exceptions, the thread would need to be
1793	+	// suspended if not already so, and we might mess with other
1794	+	// exception handlers that came after we registered ours. There is
1795	+	// no need to remove the exception handler, in fact this function is
1796	+	// not called anywhere in Basilisk II.
1797		#ifdef HAVE_SIGSEGV_RECOVERY
1798		sigsegv_fault_handler = 0;
1799		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
#	Line 738 | Line 1804 | void sigsegv_deinstall_handler(void)
1804
1805
1806		/*
741	–	*  SIGSEGV ignore state modifier
742	–	*/
743	–
744	–	void sigsegv_set_ignore_state(bool ignore_fault)
745	–	{
746	–	sigsegv_ignore_fault = ignore_fault;
747	–	}
748	–
749	–
750	–	/*
1807		*  Set callback function when we cannot handle the fault
1808		*/
1809
#	Line 768 | Line 1824 | void sigsegv_set_dump_state(sigsegv_stat
1824		#include <sys/mman.h>
1825		#include "vm_alloc.h"
1826
1827	+	const int REF_INDEX = 123;
1828	+	const int REF_VALUE = 45;
1829	+
1830		static int page_size;
1831		static volatile char * page = 0;
1832		static volatile int handler_called = 0;
1833
1834	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1834	>	#ifdef __GNUC__
1835	>	// Code range where we expect the fault to come from
1836	>	static void *b_region, *e_region;
1837	>	#endif
1838	>
1839	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1840		{
1841	+	#if DEBUG
1842	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
1843	+	printf("expected fault at %p\n", page + REF_INDEX);
1844	+	#ifdef __GNUC__
1845	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
1846	+	#endif
1847	+	#endif
1848		handler_called++;
1849	<	if ((fault_address - 123) != page)
1850	<	exit(1);
1849	>	if ((fault_address - REF_INDEX) != page)
1850	>	exit(10);
1851	>	#ifdef __GNUC__
1852	>	// Make sure reported fault instruction address falls into
1853	>	// expected code range
1854	>	if (instruction_address != SIGSEGV_INVALID_PC
1855	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1856	>	(instruction_address >= (sigsegv_address_t)e_region)))
1857	>	exit(11);
1858	>	#endif
1859		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
1860	<	exit(1);
1861	<	return true;
1860	>	exit(12);
1861	>	return SIGSEGV_RETURN_SUCCESS;
1862		}
1863
1864		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1865	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1865	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1866		{
1867	<	return false;
1867	>	#if DEBUG
1868	>	printf("sigsegv_insn_handler(%p, %p)\n", fault_address, instruction_address);
1869	>	#endif
1870	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1871	>	#ifdef __GNUC__
1872	>	// Make sure reported fault instruction address falls into
1873	>	// expected code range
1874	>	if (instruction_address != SIGSEGV_INVALID_PC
1875	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1876	>	(instruction_address >= (sigsegv_address_t)e_region)))
1877	>	return SIGSEGV_RETURN_FAILURE;
1878	>	#endif
1879	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1880	>	}
1881	>
1882	>	return SIGSEGV_RETURN_FAILURE;
1883	>	}
1884	>
1885	>	// More sophisticated tests for instruction skipper
1886	>	static bool arch_insn_skipper_tests()
1887	>	{
1888	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
1889	>	static const unsigned char code[] = {
1890	>	0x8a, 0x00,                    // mov    (%eax),%al
1891	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
1892	>	0x88, 0x20,                    // mov    %ah,(%eax)
1893	>	0x88, 0x08,                    // mov    %cl,(%eax)
1894	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
1895	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
1896	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
1897	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
1898	>	0x8b, 0x00,                    // mov    (%eax),%eax
1899	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
1900	>	0x89, 0x00,                    // mov    %eax,(%eax)
1901	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
1902	>	#if defined(__x86_64__)
1903	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
1904	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
1905	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
1906	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
1907	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
1908	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
1909	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
1910	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
1911	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
1912	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
1913	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
1914	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
1915	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
1916	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
1917	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
1918	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
1919	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
1920	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
1921	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
1922	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
1923	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
1924	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
1925	>	#endif
1926	>	0                              // end
1927	>	};
1928	>	const int N_REGS = 20;
1929	>	unsigned long regs[N_REGS];
1930	>	for (int i = 0; i < N_REGS; i++)
1931	>	regs[i] = i;
1932	>	const unsigned long start_code = (unsigned long)&code;
1933	>	regs[X86_REG_EIP] = start_code;
1934	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
1935	>	&& ix86_skip_instruction(regs))
1936	>	; /* simply iterate */
1937	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
1938	>	#endif
1939	>	return true;
1940		}
1941		#endif
1942
#	Line 796 | Line 1947 | int main(void)
1947
1948		page_size = getpagesize();
1949		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1950	<	return 1;
1950	>	return 2;
1951
1952	+	memset((void *)page, 0, page_size);
1953		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1954	<	return 1;
1954	>	return 3;
1955
1956		if (!sigsegv_install_handler(sigsegv_test_handler))
1957	<	return 1;
806	<
807	<	page[123] = 45;
808	<	page[123] = 45;
1957	>	return 4;
1958
1959	+	#ifdef __GNUC__
1960	+	b_region = &&L_b_region1;
1961	+	e_region = &&L_e_region1;
1962	+	#endif
1963	+	L_b_region1:
1964	+	page[REF_INDEX] = REF_VALUE;
1965	+	if (page[REF_INDEX] != REF_VALUE)
1966	+	exit(20);
1967	+	page[REF_INDEX] = REF_VALUE;
1968	+	L_e_region1:
1969	+
1970		if (handler_called != 1)
1971	<	return 1;
1971	>	return 5;
1972
1973		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1974		if (!sigsegv_install_handler(sigsegv_insn_handler))
1975	<	return 1;
1975	>	return 6;
1976
1977		if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
1978	<	return 1;
1978	>	return 7;
1979
1980		for (int i = 0; i < page_size; i++)
1981		page[i] = (i + 1) % page_size;
1982
1983		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1984	<	return 1;
1984	>	return 8;
1985
826	–	sigsegv_set_ignore_state(true);
827	–
1986		#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
1987	<	const unsigned int TAG = 0x12345678;                    \
1987	>	const unsigned long TAG = 0x12345678 |                  \
1988	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
1989		TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
1990	<	volatile unsigned int effect = data + TAG;              \
1990	>	volatile unsigned long effect = data + TAG;             \
1991		if (effect != TAG)                                                              \
1992	<	return 1;                                                                       \
1992	>	return 9;                                                                       \
1993		} while (0)
1994
1995	+	#ifdef __GNUC__
1996	+	b_region = &&L_b_region2;
1997	+	e_region = &&L_e_region2;
1998	+	#endif
1999	+	L_b_region2:
2000		TEST_SKIP_INSTRUCTION(unsigned char);
2001		TEST_SKIP_INSTRUCTION(unsigned short);
2002		TEST_SKIP_INSTRUCTION(unsigned int);
2003	+	TEST_SKIP_INSTRUCTION(unsigned long);
2004	+	TEST_SKIP_INSTRUCTION(signed char);
2005	+	TEST_SKIP_INSTRUCTION(signed short);
2006	+	TEST_SKIP_INSTRUCTION(signed int);
2007	+	TEST_SKIP_INSTRUCTION(signed long);
2008	+	L_e_region2:
2009	+
2010	+	if (!arch_insn_skipper_tests())
2011	+	return 20;
2012		#endif
2013
2014		vm_exit();

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