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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.10 by gbeauche, 2002-05-12T11:10:50Z vs.
Revision 1.49 by gbeauche, 2004-12-02T23:29:52Z

#	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_handler_t sigsegv_user_handler = 0;
56	>	static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
57
58		// Function called to dump state if we can't handle the fault
59	<	static sigsegv_handler_t sigsegv_dump_state = 0;
59	>	static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
60
61		// Actual SIGSEGV handler installer
62		static bool sigsegv_do_install_handler(int sig);
63
64
65		/*
66	+	*  Instruction decoding aids
67	+	*/
68	+
69	+	// Transfer size
70	+	enum transfer_size_t {
71	+	SIZE_UNKNOWN,
72	+	SIZE_BYTE,
73	+	SIZE_WORD, // 2 bytes
74	+	SIZE_LONG, // 4 bytes
75	+	SIZE_QUAD, // 8 bytes
76	+	};
77	+
78	+	// Transfer type
79	+	typedef sigsegv_transfer_type_t transfer_type_t;
80	+
81	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
82	+	// Addressing mode
83	+	enum addressing_mode_t {
84	+	MODE_UNKNOWN,
85	+	MODE_NORM,
86	+	MODE_U,
87	+	MODE_X,
88	+	MODE_UX
89	+	};
90	+
91	+	// Decoded instruction
92	+	struct instruction_t {
93	+	transfer_type_t         transfer_type;
94	+	transfer_size_t         transfer_size;
95	+	addressing_mode_t       addr_mode;
96	+	unsigned int            addr;
97	+	char                            ra, rd;
98	+	};
99	+
100	+	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned long * gpr)
101	+	{
102	+	// Get opcode and divide into fields
103	+	unsigned int opcode = *((unsigned int *)(unsigned long)nip);
104	+	unsigned int primop = opcode >> 26;
105	+	unsigned int exop = (opcode >> 1) & 0x3ff;
106	+	unsigned int ra = (opcode >> 16) & 0x1f;
107	+	unsigned int rb = (opcode >> 11) & 0x1f;
108	+	unsigned int rd = (opcode >> 21) & 0x1f;
109	+	signed int imm = (signed short)(opcode & 0xffff);
110	+
111	+	// Analyze opcode
112	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
113	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
114	+	addressing_mode_t addr_mode = MODE_UNKNOWN;
115	+	switch (primop) {
116	+	case 31:
117	+	switch (exop) {
118	+	case 23:        // lwzx
119	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
120	+	case 55:        // lwzux
121	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
122	+	case 87:        // lbzx
123	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
124	+	case 119:       // lbzux
125	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
126	+	case 151:       // stwx
127	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
128	+	case 183:       // stwux
129	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
130	+	case 215:       // stbx
131	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
132	+	case 247:       // stbux
133	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
134	+	case 279:       // lhzx
135	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
136	+	case 311:       // lhzux
137	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
138	+	case 343:       // lhax
139	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
140	+	case 375:       // lhaux
141	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
142	+	case 407:       // sthx
143	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
144	+	case 439:       // sthux
145	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
146	+	}
147	+	break;
148	+
149	+	case 32:        // lwz
150	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
151	+	case 33:        // lwzu
152	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
153	+	case 34:        // lbz
154	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
155	+	case 35:        // lbzu
156	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
157	+	case 36:        // stw
158	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
159	+	case 37:        // stwu
160	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
161	+	case 38:        // stb
162	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
163	+	case 39:        // stbu
164	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
165	+	case 40:        // lhz
166	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
167	+	case 41:        // lhzu
168	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
169	+	case 42:        // lha
170	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
171	+	case 43:        // lhau
172	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
173	+	case 44:        // sth
174	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
175	+	case 45:        // sthu
176	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
177	+	case 58:        // ld, ldu, lwa
178	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
179	+	transfer_size = SIZE_QUAD;
180	+	addr_mode = ((opcode & 3) == 1) ? MODE_U : MODE_NORM;
181	+	imm &= ~3;
182	+	break;
183	+	case 62:        // std, stdu, stq
184	+	transfer_type = SIGSEGV_TRANSFER_STORE;
185	+	transfer_size = SIZE_QUAD;
186	+	addr_mode = ((opcode & 3) == 1) ? MODE_U : MODE_NORM;
187	+	imm &= ~3;
188	+	break;
189	+	}
190	+
191	+	// Calculate effective address
192	+	unsigned int addr = 0;
193	+	switch (addr_mode) {
194	+	case MODE_X:
195	+	case MODE_UX:
196	+	if (ra == 0)
197	+	addr = gpr[rb];
198	+	else
199	+	addr = gpr[ra] + gpr[rb];
200	+	break;
201	+	case MODE_NORM:
202	+	case MODE_U:
203	+	if (ra == 0)
204	+	addr = (signed int)(signed short)imm;
205	+	else
206	+	addr = gpr[ra] + (signed int)(signed short)imm;
207	+	break;
208	+	default:
209	+	break;
210	+	}
211	+
212	+	// Commit decoded instruction
213	+	instruction->addr = addr;
214	+	instruction->addr_mode = addr_mode;
215	+	instruction->transfer_type = transfer_type;
216	+	instruction->transfer_size = transfer_size;
217	+	instruction->ra = ra;
218	+	instruction->rd = rd;
219	+	}
220	+	#endif
221	+
222	+
223	+	/*
224		*  OS-dependant SIGSEGV signals support section
225		*/
226
#	Line 65 | Line 232 | static bool sigsegv_do_install_handler(i
232		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
233		#endif
234		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
235	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t *sip, void *scp
236	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sip, scp
237		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
238	+	#if (defined(sgi) || defined(__sgi))
239	+	#include <ucontext.h>
240	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
241	+	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)SIGSEGV_CONTEXT_REGS[CTX_EPC]
242	+	#if (defined(mips) || defined(__mips))
243	+	#define SIGSEGV_REGISTER_FILE                   SIGSEGV_CONTEXT_REGS
244	+	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
245	+	#endif
246	+	#endif
247	+	#if defined(__sun__)
248	+	#if (defined(sparc) || defined(__sparc__))
249	+	#include <sys/stack.h>
250	+	#include <sys/regset.h>
251	+	#include <sys/ucontext.h>
252	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
253	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[REG_PC]
254	+	#define SIGSEGV_SPARC_GWINDOWS                  (((ucontext_t *)scp)->uc_mcontext.gwins)
255	+	#define SIGSEGV_SPARC_RWINDOW                   (struct rwindow *)((char *)SIGSEGV_CONTEXT_REGS[REG_SP] + STACK_BIAS)
256	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)SIGSEGV_CONTEXT_REGS), SIGSEGV_SPARC_GWINDOWS, SIGSEGV_SPARC_RWINDOW
257	+	#define SIGSEGV_SKIP_INSTRUCTION                sparc_skip_instruction
258	+	#endif
259	+	#endif
260	+	#if defined(__FreeBSD__)
261	+	#if (defined(i386) || defined(__i386__))
262	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
263	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
264	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
265	+	#endif
266	+	#endif
267		#if defined(__linux__)
268		#if (defined(i386) || defined(__i386__))
269		#include <sys/ucontext.h>
270	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
271	<	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)(((ucontext_t *)scp)->uc_mcontext.gregs)
270	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
271	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
272	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
273	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
274	>	#endif
275	>	#if (defined(x86_64) || defined(__x86_64__))
276	>	#include <sys/ucontext.h>
277	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
278	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
279	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
280		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
281		#endif
282		#if (defined(ia64) || defined(__ia64__))
#	Line 78 | Line 284 | static bool sigsegv_do_install_handler(i
284		#endif
285		#if (defined(powerpc) || defined(__powerpc__))
286		#include <sys/ucontext.h>
287	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.regs->nip)
287	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
288	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
289	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned long *)(SIGSEGV_CONTEXT_REGS->gpr)
290	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
291	>	#endif
292	>	#if (defined(hppa) || defined(__hppa__))
293	>	#undef  SIGSEGV_FAULT_ADDRESS
294	>	#define SIGSEGV_FAULT_ADDRESS                   sip->si_ptr
295	>	#endif
296	>	#if (defined(arm) || defined(__arm__))
297	>	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
298	>	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
299	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.arm_pc)
300	>	#define SIGSEGV_REGISTER_FILE                   (&SIGSEGV_CONTEXT_REGS.arm_r0)
301	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
302		#endif
303		#endif
304		#endif
#	Line 90 | Line 310 | static bool sigsegv_do_install_handler(i
310		#if (defined(i386) || defined(__i386__))
311		#include <asm/sigcontext.h>
312		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
313	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
314	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
315	<	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)(&scs)
313	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
314	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
315	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
316	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
317	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
318		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
319		#endif
320		#if (defined(sparc) || defined(__sparc__))
321		#include <asm/sigcontext.h>
322		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
323	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
324		#define SIGSEGV_FAULT_ADDRESS                   addr
325		#endif
326		#if (defined(powerpc) || defined(__powerpc__))
327		#include <asm/sigcontext.h>
328		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
329	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
330		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
331		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
332	+	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)&scp->regs->nip, (unsigned long *)(scp->regs->gpr)
333	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
334		#endif
335		#if (defined(alpha) || defined(__alpha__))
336		#include <asm/sigcontext.h>
337		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
338	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
339		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
340		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
341	<
342	<	// From Boehm's GC 6.0alpha8
343	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
344	<	{
345	<	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
346	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
347	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
348	<	return (sigsegv_address_t)fault_address;
349	<	}
341	>	#endif
342	>	#if (defined(arm) || defined(__arm__))
343	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int r1, int r2, int r3, struct sigcontext sc
344	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
345	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &sc
346	>	#define SIGSEGV_FAULT_ADDRESS                   scp->fault_address
347	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->arm_pc
348	>	#define SIGSEGV_REGISTER_FILE                   &scp->arm_r0
349	>	#define SIGSEGV_SKIP_INSTRUCTION                arm_skip_instruction
350		#endif
351		#endif
352
353		// Irix 5 or 6 on MIPS
354	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
354	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
355	>	#include <ucontext.h>
356		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
357	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
357	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
358	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
359	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
360		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
361		#endif
362
363	+	// HP-UX
364	+	#if (defined(hpux) || defined(__hpux__))
365	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
366	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
367	+	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
368	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
369	+	#endif
370	+
371		// OSF/1 on Alpha
372		#if defined(__osf__)
373	+	#include <ucontext.h>
374		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
375	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
376		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
377		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
378		#endif
#	Line 140 | Line 380 | static sigsegv_address_t get_fault_addre
380		// AIX
381		#if defined(_AIX)
382		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
383	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
384		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
385		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
386		#endif
387
388	<	// NetBSD or FreeBSD
389	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
388	>	// NetBSD
389	>	#if defined(__NetBSD__)
390		#if (defined(m68k) || defined(__m68k__))
391		#include <m68k/frame.h>
392		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
393	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
394	<	struct sigstate {                                                                                                                                                                       \
154	<	int ss_flags;                                                                                                                                                                   \
155	<	struct frame ss_frame;                                                                                                                                                  \
156	<	};                                                                                                                                                                                                      \
157	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
158	<	char *fault_addr;                                                                                                                                                                       \
159	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
160	<	case 7:         /* 68040 access error */                                                                                                                                \
161	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
162	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
163	<	break;                                                                                                                                                                                  \
164	<	default:                                                                                                                                                                                        \
165	<	fault_addr = (char *)code;                                                                                                                                              \
166	<	break;                                                                                                                                                                                  \
167	<	}                                                                                                                                                                                                       \
168	<	fault_addr;                                                                                                                                                                                     \
169	<	})
393	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
394	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
395		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
396	<	#else
397	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
398	<	#define SIGSEGV_FAULT_ADDRESS                   addr
396	>
397	>	// Use decoding scheme from BasiliskII/m68k native
398	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
399	>	{
400	>	struct sigstate {
401	>	int ss_flags;
402	>	struct frame ss_frame;
403	>	};
404	>	struct sigstate *state = (struct sigstate *)scp->sc_ap;
405	>	char *fault_addr;
406	>	switch (state->ss_frame.f_format) {
407	>	case 7:         /* 68040 access error */
408	>	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
409	>	fault_addr = state->ss_frame.f_fmt7.f_fa;
410	>	break;
411	>	default:
412	>	fault_addr = (char *)code;
413	>	break;
414	>	}
415	>	return (sigsegv_address_t)fault_addr;
416	>	}
417	>	#endif
418	>	#if (defined(alpha) || defined(__alpha__))
419	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
420	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
421	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
422		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
423		#endif
424	+	#if (defined(i386) || defined(__i386__))
425	+	#error "FIXME: need to decode instruction and compute EA"
426	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
427	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
428	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
429	+	#endif
430	+	#endif
431	+	#if defined(__FreeBSD__)
432	+	#if (defined(i386) || defined(__i386__))
433	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
434	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
435	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
436	+	#define SIGSEGV_FAULT_ADDRESS                   addr
437	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
438	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
439	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
440		#endif
441	+	#if (defined(alpha) || defined(__alpha__))
442	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
443	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, char *addr, struct sigcontext *scp
444	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, addr, scp
445	+	#define SIGSEGV_FAULT_ADDRESS                   addr
446	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
447	+	#endif
448	+	#endif
449	+
450	+	// Extract fault address out of a sigcontext
451	+	#if (defined(alpha) || defined(__alpha__))
452	+	// From Boehm's GC 6.0alpha8
453	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
454	+	{
455	+	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
456	+	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
457	+	fault_address += (signed long)(signed short)(instruction & 0xffff);
458	+	return (sigsegv_address_t)fault_address;
459	+	}
460	+	#endif
461	+
462
463	<	// MacOS X
463	>	// MacOS X, not sure which version this works in. Under 10.1
464	>	// vm_protect does not appear to work from a signal handler. Under
465	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
466	>	// field is the address of the faulting instruction and not the
467	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
468	>	// case with Mach exception handlers there is a way to do what this
469	>	// was meant to do.
470	>	#ifndef HAVE_MACH_EXCEPTIONS
471		#if defined(__APPLE__) && defined(__MACH__)
472		#if (defined(ppc) || defined(__ppc__))
473		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
474	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
475		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
476		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
477		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
478	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
479	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
480
481	<	// From Boehm's GC 6.0alpha8
187	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
188	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
189	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
190	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
191	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
192	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
193	<
481	>	// Use decoding scheme from SheepShaver
482		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
483		{
484	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
485	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
486	<	int            disp = 0, tmp;
487	<	unsigned int   baseA = 0, baseB = 0;
488	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
489	<
490	<	switch(EXTRACT_OP1(instr)) {
491	<	case 38:   /* stb */
492	<	case 39:   /* stbu */
493	<	case 54:   /* stfd */
494	<	case 55:   /* stfdu */
495	<	case 52:   /* stfs */
496	<	case 53:   /* stfsu */
497	<	case 44:   /* sth */
498	<	case 45:   /* sthu */
499	<	case 47:   /* stmw */
500	<	case 36:   /* stw */
501	<	case 37:   /* stwu */
502	<	tmp = EXTRACT_REGA(instr);
503	<	if(tmp > 0)
504	<	baseA = regs[tmp];
505	<	disp = EXTRACT_DISP(instr);
506	<	break;
507	<	case 31:
508	<	switch(EXTRACT_OP2(instr)) {
509	<	case 86:    /* dcbf */
510	<	case 54:    /* dcbst */
511	<	case 1014:  /* dcbz */
512	<	case 247:   /* stbux */
513	<	case 215:   /* stbx */
514	<	case 759:   /* stfdux */
515	<	case 727:   /* stfdx */
516	<	case 983:   /* stfiwx */
517	<	case 695:   /* stfsux */
518	<	case 663:   /* stfsx */
519	<	case 918:   /* sthbrx */
520	<	case 439:   /* sthux */
521	<	case 407:   /* sthx */
522	<	case 661:   /* stswx */
523	<	case 662:   /* stwbrx */
524	<	case 150:   /* stwcx. */
525	<	case 183:   /* stwux */
526	<	case 151:   /* stwx */
527	<	case 135:   /* stvebx */
528	<	case 167:   /* stvehx */
529	<	case 199:   /* stvewx */
530	<	case 231:   /* stvx */
531	<	case 487:   /* stvxl */
532	<	tmp = EXTRACT_REGA(instr);
533	<	if(tmp > 0)
534	<	baseA = regs[tmp];
535	<	baseB = regs[EXTRACT_REGC(instr)];
536	<	/* determine Altivec alignment mask */
537	<	switch(EXTRACT_OP2(instr)) {
538	<	case 167:   /* stvehx */
539	<	alignmask = 0xFFFFFFFE;
540	<	break;
541	<	case 199:   /* stvewx */
542	<	alignmask = 0xFFFFFFFC;
543	<	break;
544	<	case 231:   /* stvx */
545	<	alignmask = 0xFFFFFFF0;
546	<	break;
547	<	case 487:  /* stvxl */
548	<	alignmask = 0xFFFFFFF0;
549	<	break;
550	<	}
551	<	break;
552	<	case 725:   /* stswi */
553	<	tmp = EXTRACT_REGA(instr);
554	<	if(tmp > 0)
555	<	baseA = regs[tmp];
556	<	break;
557	<	default:   /* ignore instruction */
558	<	return 0;
559	<	break;
484	>	unsigned int   nip = (unsigned int) scp->sc_ir;
485	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
486	>	instruction_t  instr;
487	>
488	>	powerpc_decode_instruction(&instr, nip, gpr);
489	>	return (sigsegv_address_t)instr.addr;
490	>	}
491	>	#endif
492	>	#endif
493	>	#endif
494	>	#endif
495	>
496	>	#if HAVE_WIN32_EXCEPTIONS
497	>	#define WIN32_LEAN_AND_MEAN /* avoid including junk */
498	>	#include <windows.h>
499	>	#include <winerror.h>
500	>
501	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   EXCEPTION_POINTERS *ExceptionInfo
502	>	#define SIGSEGV_FAULT_HANDLER_ARGS              ExceptionInfo
503	>	#define SIGSEGV_FAULT_ADDRESS                   ExceptionInfo->ExceptionRecord->ExceptionInformation[1]
504	>	#define SIGSEGV_CONTEXT_REGS                    ExceptionInfo->ContextRecord
505	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS->Eip
506	>	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&SIGSEGV_CONTEXT_REGS->Edi)
507	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
508	>	#endif
509	>
510	>	#if HAVE_MACH_EXCEPTIONS
511	>
512	>	// This can easily be extended to other Mach systems, but really who
513	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
514	>	// Mach 2.5/3.0?
515	>	#if defined(__APPLE__) && defined(__MACH__)
516	>
517	>	#include <sys/types.h>
518	>	#include <stdlib.h>
519	>	#include <stdio.h>
520	>	#include <pthread.h>
521	>
522	>	/*
523	>	* If you are familiar with MIG then you will understand the frustration
524	>	* that was necessary to get these embedded into C++ code by hand.
525	>	*/
526	>	extern "C" {
527	>	#include <mach/mach.h>
528	>	#include <mach/mach_error.h>
529	>
530	>	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
531	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
532	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
533	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
534	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
535	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
536	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
537	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
538	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
539	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
540	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
541	>	}
542	>
543	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
544	>	#define HANDLER_COUNT 64
545	>
546	>	// structure to tuck away existing exception handlers
547	>	typedef struct _ExceptionPorts {
548	>	mach_msg_type_number_t maskCount;
549	>	exception_mask_t masks[HANDLER_COUNT];
550	>	exception_handler_t handlers[HANDLER_COUNT];
551	>	exception_behavior_t behaviors[HANDLER_COUNT];
552	>	thread_state_flavor_t flavors[HANDLER_COUNT];
553	>	} ExceptionPorts;
554	>
555	>	// exception handler thread
556	>	static pthread_t exc_thread;
557	>
558	>	// place where old exception handler info is stored
559	>	static ExceptionPorts ports;
560	>
561	>	// our exception port
562	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
563	>
564	>	#define MACH_CHECK_ERROR(name,ret) \
565	>	if (ret != KERN_SUCCESS) { \
566	>	mach_error(#name, ret); \
567	>	exit (1); \
568	>	}
569	>
570	>	#define SIGSEGV_FAULT_ADDRESS                   code[1]
571	>	#define SIGSEGV_FAULT_INSTRUCTION               get_fault_instruction(thread, state)
572	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
573	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
574	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
575	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
576	>	#define SIGSEGV_REGISTER_FILE                   &state->srr0, &state->r0
577	>
578	>	// Given a suspended thread, stuff the current instruction and
579	>	// registers into state.
580	>	//
581	>	// It would have been nice to have this be ppc/x86 independant which
582	>	// could have been done easily with a thread_state_t instead of
583	>	// ppc_thread_state_t, but because of the way this is called it is
584	>	// easier to do it this way.
585	>	#if (defined(ppc) || defined(__ppc__))
586	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
587	>	{
588	>	kern_return_t krc;
589	>	mach_msg_type_number_t count;
590	>
591	>	count = MACHINE_THREAD_STATE_COUNT;
592	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
593	>	MACH_CHECK_ERROR (thread_get_state, krc);
594	>
595	>	return (sigsegv_address_t)state->srr0;
596	>	}
597	>	#endif
598	>
599	>	// Since there can only be one exception thread running at any time
600	>	// this is not a problem.
601	>	#define MSG_SIZE 512
602	>	static char msgbuf[MSG_SIZE];
603	>	static char replybuf[MSG_SIZE];
604	>
605	>	/*
606	>	* This is the entry point for the exception handler thread. The job
607	>	* of this thread is to wait for exception messages on the exception
608	>	* port that was setup beforehand and to pass them on to exc_server.
609	>	* exc_server is a MIG generated function that is a part of Mach.
610	>	* Its job is to decide what to do with the exception message. In our
611	>	* case exc_server calls catch_exception_raise on our behalf. After
612	>	* exc_server returns, it is our responsibility to send the reply.
613	>	*/
614	>	static void *
615	>	handleExceptions(void *priv)
616	>	{
617	>	mach_msg_header_t *msg, *reply;
618	>	kern_return_t krc;
619	>
620	>	msg = (mach_msg_header_t *)msgbuf;
621	>	reply = (mach_msg_header_t *)replybuf;
622	>
623	>	for (;;) {
624	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
625	>	_exceptionPort, 0, MACH_PORT_NULL);
626	>	MACH_CHECK_ERROR(mach_msg, krc);
627	>
628	>	if (!exc_server(msg, reply)) {
629	>	fprintf(stderr, "exc_server hated the message\n");
630	>	exit(1);
631	>	}
632	>
633	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
634	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
635	>	if (krc != KERN_SUCCESS) {
636	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
637	>	krc, mach_error_string(krc));
638	>	exit(1);
639		}
273	–	break;
274	–	default:   /* ignore instruction */
275	–	return 0;
276	–	break;
640		}
278	–
279	–	addr = (baseA + baseB) + disp;
280	–	addr &= alignmask;
281	–	return (sigsegv_address_t)addr;
641		}
642		#endif
643		#endif
644	<	#endif
644	>
645	>
646	>	/*
647	>	*  Instruction skipping
648	>	*/
649
650		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
651		// Decode and skip X86 instruction
652	<	#if (defined(i386) || defined(__i386__))
652	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
653		#if defined(__linux__)
654		enum {
655	+	#if (defined(i386) || defined(__i386__))
656		X86_REG_EIP = 14,
657		X86_REG_EAX = 11,
658		X86_REG_ECX = 10,
#	Line 298 | Line 662 | enum {
662		X86_REG_EBP = 6,
663		X86_REG_ESI = 5,
664		X86_REG_EDI = 4
665	+	#endif
666	+	#if defined(__x86_64__)
667	+	X86_REG_R8  = 0,
668	+	X86_REG_R9  = 1,
669	+	X86_REG_R10 = 2,
670	+	X86_REG_R11 = 3,
671	+	X86_REG_R12 = 4,
672	+	X86_REG_R13 = 5,
673	+	X86_REG_R14 = 6,
674	+	X86_REG_R15 = 7,
675	+	X86_REG_EDI = 8,
676	+	X86_REG_ESI = 9,
677	+	X86_REG_EBP = 10,
678	+	X86_REG_EBX = 11,
679	+	X86_REG_EDX = 12,
680	+	X86_REG_EAX = 13,
681	+	X86_REG_ECX = 14,
682	+	X86_REG_ESP = 15,
683	+	X86_REG_EIP = 16
684	+	#endif
685	+	};
686	+	#endif
687	+	#if defined(__NetBSD__) || defined(__FreeBSD__)
688	+	enum {
689	+	#if (defined(i386) || defined(__i386__))
690	+	X86_REG_EIP = 10,
691	+	X86_REG_EAX = 7,
692	+	X86_REG_ECX = 6,
693	+	X86_REG_EDX = 5,
694	+	X86_REG_EBX = 4,
695	+	X86_REG_ESP = 13,
696	+	X86_REG_EBP = 2,
697	+	X86_REG_ESI = 1,
698	+	X86_REG_EDI = 0
699	+	#endif
700	+	};
701	+	#endif
702	+	#if defined(_WIN32)
703	+	enum {
704	+	#if (defined(i386) || defined(__i386__))
705	+	X86_REG_EIP = 7,
706	+	X86_REG_EAX = 5,
707	+	X86_REG_ECX = 4,
708	+	X86_REG_EDX = 3,
709	+	X86_REG_EBX = 2,
710	+	X86_REG_ESP = 10,
711	+	X86_REG_EBP = 6,
712	+	X86_REG_ESI = 1,
713	+	X86_REG_EDI = 0
714	+	#endif
715		};
716		#endif
717		// FIXME: this is partly redundant with the instruction decoding phase
#	Line 334 | Line 748 | static inline int ix86_step_over_modrm(u
748		return offset;
749		}
750
751	<	static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs)
751	>	static bool ix86_skip_instruction(unsigned long * regs)
752		{
753	<	unsigned char * eip = (unsigned char *)fault_instruction;
753	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
754
755		if (eip == 0)
756		return false;
757
758	<	// Transfer type
759	<	enum {
346	<	TYPE_UNKNOWN,
347	<	TYPE_LOAD,
348	<	TYPE_STORE
349	<	} transfer_type = TYPE_UNKNOWN;
350	<
351	<	// Transfer size
352	<	enum {
353	<	SIZE_BYTE,
354	<	SIZE_WORD,
355	<	SIZE_LONG
356	<	} transfer_size = SIZE_LONG;
758	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
759	>	transfer_size_t transfer_size = SIZE_LONG;
760
761		int reg = -1;
762		int len = 0;
763	<
763	>
764	>	#if DEBUG
765	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
766	>	eip, eip[0], eip[1], eip[2], eip[3]);
767	>	#endif
768	>
769		// Operand size prefix
770		if (*eip == 0x66) {
771		eip++;
#	Line 365 | Line 773 | static bool ix86_skip_instruction(sigseg
773		transfer_size = SIZE_WORD;
774		}
775
776	+	// REX prefix
777	+	#if defined(__x86_64__)
778	+	struct rex_t {
779	+	unsigned char W;
780	+	unsigned char R;
781	+	unsigned char X;
782	+	unsigned char B;
783	+	};
784	+	rex_t rex = { 0, 0, 0, 0 };
785	+	bool has_rex = false;
786	+	if ((*eip & 0xf0) == 0x40) {
787	+	has_rex = true;
788	+	const unsigned char b = *eip;
789	+	rex.W = b & (1 << 3);
790	+	rex.R = b & (1 << 2);
791	+	rex.X = b & (1 << 1);
792	+	rex.B = b & (1 << 0);
793	+	#if DEBUG
794	+	printf("REX: %c,%c,%c,%c\n",
795	+	rex.W ? 'W' : '_',
796	+	rex.R ? 'R' : '_',
797	+	rex.X ? 'X' : '_',
798	+	rex.B ? 'B' : '_');
799	+	#endif
800	+	eip++;
801	+	len++;
802	+	if (rex.W)
803	+	transfer_size = SIZE_QUAD;
804	+	}
805	+	#else
806	+	const bool has_rex = false;
807	+	#endif
808	+
809		// Decode instruction
810	+	int target_size = SIZE_UNKNOWN;
811		switch (eip[0]) {
812	+	case 0x0f:
813	+	target_size = transfer_size;
814	+	switch (eip[1]) {
815	+	case 0xbe: // MOVSX r32, r/m8
816	+	case 0xb6: // MOVZX r32, r/m8
817	+	transfer_size = SIZE_BYTE;
818	+	goto do_mov_extend;
819	+	case 0xbf: // MOVSX r32, r/m16
820	+	case 0xb7: // MOVZX r32, r/m16
821	+	transfer_size = SIZE_WORD;
822	+	goto do_mov_extend;
823	+	do_mov_extend:
824	+	switch (eip[2] & 0xc0) {
825	+	case 0x80:
826	+	reg = (eip[2] >> 3) & 7;
827	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
828	+	break;
829	+	case 0x40:
830	+	reg = (eip[2] >> 3) & 7;
831	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
832	+	break;
833	+	case 0x00:
834	+	reg = (eip[2] >> 3) & 7;
835	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
836	+	break;
837	+	}
838	+	len += 3 + ix86_step_over_modrm(eip + 2);
839	+	break;
840	+	}
841	+	break;
842		case 0x8a: // MOV r8, r/m8
843		transfer_size = SIZE_BYTE;
844		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
845		switch (eip[1] & 0xc0) {
846		case 0x80:
847		reg = (eip[1] >> 3) & 7;
848	<	transfer_type = TYPE_LOAD;
848	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
849		break;
850		case 0x40:
851		reg = (eip[1] >> 3) & 7;
852	<	transfer_type = TYPE_LOAD;
852	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
853		break;
854		case 0x00:
855		reg = (eip[1] >> 3) & 7;
856	<	transfer_type = TYPE_LOAD;
856	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
857		break;
858		}
859		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 392 | Line 864 | static bool ix86_skip_instruction(sigseg
864		switch (eip[1] & 0xc0) {
865		case 0x80:
866		reg = (eip[1] >> 3) & 7;
867	<	transfer_type = TYPE_STORE;
867	>	transfer_type = SIGSEGV_TRANSFER_STORE;
868		break;
869		case 0x40:
870		reg = (eip[1] >> 3) & 7;
871	<	transfer_type = TYPE_STORE;
871	>	transfer_type = SIGSEGV_TRANSFER_STORE;
872		break;
873		case 0x00:
874		reg = (eip[1] >> 3) & 7;
875	<	transfer_type = TYPE_STORE;
875	>	transfer_type = SIGSEGV_TRANSFER_STORE;
876		break;
877		}
878		len += 2 + ix86_step_over_modrm(eip + 1);
879		break;
880		}
881	+	if (target_size == SIZE_UNKNOWN)
882	+	target_size = transfer_size;
883
884	<	if (transfer_type == TYPE_UNKNOWN) {
884	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
885		// Unknown machine code, let it crash. Then patch the decoder
886		return false;
887		}
888
889	<	if (transfer_type == TYPE_LOAD && reg != -1) {
890	<	static const int x86_reg_map[8] = {
889	>	#if defined(__x86_64__)
890	>	if (rex.R)
891	>	reg += 8;
892	>	#endif
893	>
894	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
895	>	static const int x86_reg_map[] = {
896		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
897	<	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
897	>	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
898	>	#if defined(__x86_64__)
899	>	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
900	>	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
901	>	#endif
902		};
903
904	<	if (reg < 0 || reg >= 8)
904	>	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
905		return false;
906
907	+	// Set 0 to the relevant register part
908	+	// NOTE: this is only valid for MOV alike instructions
909		int rloc = x86_reg_map[reg];
910	<	switch (transfer_size) {
910	>	switch (target_size) {
911		case SIZE_BYTE:
912	<	regs[rloc] = (regs[rloc] & ~0xff);
912	>	if (has_rex || reg < 4)
913	>	regs[rloc] = (regs[rloc] & ~0x00ffL);
914	>	else {
915	>	rloc = x86_reg_map[reg - 4];
916	>	regs[rloc] = (regs[rloc] & ~0xff00L);
917	>	}
918		break;
919		case SIZE_WORD:
920	<	regs[rloc] = (regs[rloc] & ~0xffff);
920	>	regs[rloc] = (regs[rloc] & ~0xffffL);
921		break;
922		case SIZE_LONG:
923	+	case SIZE_QUAD: // zero-extension
924		regs[rloc] = 0;
925		break;
926		}
#	Line 437 | Line 928 | static bool ix86_skip_instruction(sigseg
928
929		#if DEBUG
930		printf("%08x: %s %s access", regs[X86_REG_EIP],
931	<	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
932	<	transfer_type == TYPE_LOAD ? "read" : "write");
931	>	transfer_size == SIZE_BYTE ? "byte" :
932	>	transfer_size == SIZE_WORD ? "word" :
933	>	transfer_size == SIZE_LONG ? "long" :
934	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
935	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
936
937		if (reg != -1) {
938	<	static const char * x86_reg_str_map[8] = {
939	<	"eax", "ecx", "edx", "ebx",
940	<	"esp", "ebp", "esi", "edi"
938	>	static const char * x86_byte_reg_str_map[] = {
939	>	"al",   "cl",   "dl",   "bl",
940	>	"spl",  "bpl",  "sil",  "dil",
941	>	"r8b",  "r9b",  "r10b", "r11b",
942	>	"r12b", "r13b", "r14b", "r15b",
943	>	"ah",   "ch",   "dh",   "bh",
944	>	};
945	>	static const char * x86_word_reg_str_map[] = {
946	>	"ax",   "cx",   "dx",   "bx",
947	>	"sp",   "bp",   "si",   "di",
948	>	"r8w",  "r9w",  "r10w", "r11w",
949	>	"r12w", "r13w", "r14w", "r15w",
950	>	};
951	>	static const char *x86_long_reg_str_map[] = {
952	>	"eax",  "ecx",  "edx",  "ebx",
953	>	"esp",  "ebp",  "esi",  "edi",
954	>	"r8d",  "r9d",  "r10d", "r11d",
955	>	"r12d", "r13d", "r14d", "r15d",
956		};
957	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
957	>	static const char *x86_quad_reg_str_map[] = {
958	>	"rax", "rcx", "rdx", "rbx",
959	>	"rsp", "rbp", "rsi", "rdi",
960	>	"r8",  "r9",  "r10", "r11",
961	>	"r12", "r13", "r14", "r15",
962	>	};
963	>	const char * reg_str = NULL;
964	>	switch (target_size) {
965	>	case SIZE_BYTE:
966	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
967	>	break;
968	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
969	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
970	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
971	>	}
972	>	if (reg_str)
973	>	printf(" %s register %%%s",
974	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
975	>	reg_str);
976		}
977		printf(", %d bytes instruction\n", len);
978		#endif
#	Line 454 | Line 981 | static bool ix86_skip_instruction(sigseg
981		return true;
982		}
983		#endif
984	+
985	+	// Decode and skip PPC instruction
986	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
987	+	static bool powerpc_skip_instruction(unsigned long * nip_p, unsigned long * regs)
988	+	{
989	+	instruction_t instr;
990	+	powerpc_decode_instruction(&instr, *nip_p, regs);
991	+
992	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
993	+	// Unknown machine code, let it crash. Then patch the decoder
994	+	return false;
995	+	}
996	+
997	+	#if DEBUG
998	+	printf("%08x: %s %s access", *nip_p,
999	+	instr.transfer_size == SIZE_BYTE ? "byte" :
1000	+	instr.transfer_size == SIZE_WORD ? "word" :
1001	+	instr.transfer_size == SIZE_LONG ? "long" : "quad",
1002	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
1003	+
1004	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1005	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
1006	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1007	+	printf(" r%d (rd = 0)\n", instr.rd);
1008	+	#endif
1009	+
1010	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
1011	+	regs[instr.ra] = instr.addr;
1012	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
1013	+	regs[instr.rd] = 0;
1014	+
1015	+	*nip_p += 4;
1016	+	return true;
1017	+	}
1018	+	#endif
1019	+
1020	+	// Decode and skip MIPS instruction
1021	+	#if (defined(mips) || defined(__mips))
1022	+	enum {
1023	+	#if (defined(sgi) || defined(__sgi))
1024	+	MIPS_REG_EPC = 35,
1025		#endif
1026	+	};
1027	+	static bool mips_skip_instruction(greg_t * regs)
1028	+	{
1029	+	unsigned int * epc = (unsigned int *)(unsigned long)regs[MIPS_REG_EPC];
1030	+
1031	+	if (epc == 0)
1032	+	return false;
1033	+
1034	+	#if DEBUG
1035	+	printf("IP: %p [%08x]\n", epc, epc[0]);
1036	+	#endif
1037	+
1038	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1039	+	transfer_size_t transfer_size = SIZE_LONG;
1040	+	int direction = 0;
1041	+
1042	+	const unsigned int opcode = epc[0];
1043	+	switch (opcode >> 26) {
1044	+	case 32: // Load Byte
1045	+	case 36: // Load Byte Unsigned
1046	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1047	+	transfer_size = SIZE_BYTE;
1048	+	break;
1049	+	case 33: // Load Halfword
1050	+	case 37: // Load Halfword Unsigned
1051	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1052	+	transfer_size = SIZE_WORD;
1053	+	break;
1054	+	case 35: // Load Word
1055	+	case 39: // Load Word Unsigned
1056	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1057	+	transfer_size = SIZE_LONG;
1058	+	break;
1059	+	case 34: // Load Word Left
1060	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1061	+	transfer_size = SIZE_LONG;
1062	+	direction = -1;
1063	+	break;
1064	+	case 38: // Load Word Right
1065	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1066	+	transfer_size = SIZE_LONG;
1067	+	direction = 1;
1068	+	break;
1069	+	case 55: // Load Doubleword
1070	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1071	+	transfer_size = SIZE_QUAD;
1072	+	break;
1073	+	case 26: // Load Doubleword Left
1074	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1075	+	transfer_size = SIZE_QUAD;
1076	+	direction = -1;
1077	+	break;
1078	+	case 27: // Load Doubleword Right
1079	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1080	+	transfer_size = SIZE_QUAD;
1081	+	direction = 1;
1082	+	break;
1083	+	case 40: // Store Byte
1084	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1085	+	transfer_size = SIZE_BYTE;
1086	+	break;
1087	+	case 41: // Store Halfword
1088	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1089	+	transfer_size = SIZE_WORD;
1090	+	break;
1091	+	case 43: // Store Word
1092	+	case 42: // Store Word Left
1093	+	case 46: // Store Word Right
1094	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1095	+	transfer_size = SIZE_LONG;
1096	+	break;
1097	+	case 63: // Store Doubleword
1098	+	case 44: // Store Doubleword Left
1099	+	case 45: // Store Doubleword Right
1100	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1101	+	transfer_size = SIZE_QUAD;
1102	+	break;
1103	+	/* Misc instructions unlikely to be used within CPU emulators */
1104	+	case 48: // Load Linked Word
1105	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1106	+	transfer_size = SIZE_LONG;
1107	+	break;
1108	+	case 52: // Load Linked Doubleword
1109	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1110	+	transfer_size = SIZE_QUAD;
1111	+	break;
1112	+	case 56: // Store Conditional Word
1113	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1114	+	transfer_size = SIZE_LONG;
1115	+	break;
1116	+	case 60: // Store Conditional Doubleword
1117	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1118	+	transfer_size = SIZE_QUAD;
1119	+	break;
1120	+	}
1121	+
1122	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1123	+	// Unknown machine code, let it crash. Then patch the decoder
1124	+	return false;
1125	+	}
1126	+
1127	+	// Zero target register in case of a load operation
1128	+	const int reg = (opcode >> 16) & 0x1f;
1129	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
1130	+	if (direction == 0)
1131	+	regs[reg] = 0;
1132	+	else {
1133	+	// FIXME: untested code
1134	+	unsigned long ea = regs[(opcode >> 21) & 0x1f];
1135	+	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
1136	+	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
1137	+	unsigned long value;
1138	+	if (direction > 0) {
1139	+	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
1140	+	value = regs[reg] & rmask;
1141	+	}
1142	+	else {
1143	+	const unsigned long lmask = (1L << (offset * 8)) - 1;
1144	+	value = regs[reg] & lmask;
1145	+	}
1146	+	// restore most significant bits
1147	+	if (transfer_size == SIZE_LONG)
1148	+	value = (signed long)(signed int)value;
1149	+	regs[reg] = value;
1150	+	}
1151	+	}
1152	+
1153	+	#if DEBUG
1154	+	#if (defined(_ABIN32) || defined(_ABI64))
1155	+	static const char * mips_gpr_names[32] = {
1156	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1157	+	"t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
1158	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1159	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1160	+	};
1161	+	#else
1162	+	static const char * mips_gpr_names[32] = {
1163	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1164	+	"a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
1165	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1166	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1167	+	};
1168	+	#endif
1169	+	printf("%s %s register %s\n",
1170	+	transfer_size == SIZE_BYTE ? "byte" :
1171	+	transfer_size == SIZE_WORD ? "word" :
1172	+	transfer_size == SIZE_LONG ? "long" :
1173	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1174	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1175	+	mips_gpr_names[reg]);
1176	+	#endif
1177	+
1178	+	regs[MIPS_REG_EPC] += 4;
1179	+	return true;
1180	+	}
1181	+	#endif
1182	+
1183	+	// Decode and skip SPARC instruction
1184	+	#if (defined(sparc) || defined(__sparc__))
1185	+	enum {
1186	+	#if (defined(__sun__))
1187	+	SPARC_REG_G1 = REG_G1,
1188	+	SPARC_REG_O0 = REG_O0,
1189	+	SPARC_REG_PC = REG_PC,
1190	+	#endif
1191	+	};
1192	+	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
1193	+	{
1194	+	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
1195	+
1196	+	if (pc == 0)
1197	+	return false;
1198	+
1199	+	#if DEBUG
1200	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1201	+	#endif
1202	+
1203	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1204	+	transfer_size_t transfer_size = SIZE_LONG;
1205	+	bool register_pair = false;
1206	+
1207	+	const unsigned int opcode = pc[0];
1208	+	if ((opcode >> 30) != 3)
1209	+	return false;
1210	+	switch ((opcode >> 19) & 0x3f) {
1211	+	case 9: // Load Signed Byte
1212	+	case 1: // Load Unsigned Byte
1213	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1214	+	transfer_size = SIZE_BYTE;
1215	+	break;
1216	+	case 10:// Load Signed Halfword
1217	+	case 2: // Load Unsigned Word
1218	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1219	+	transfer_size = SIZE_WORD;
1220	+	break;
1221	+	case 8: // Load Word
1222	+	case 0: // Load Unsigned Word
1223	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1224	+	transfer_size = SIZE_LONG;
1225	+	break;
1226	+	case 11:// Load Extended Word
1227	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1228	+	transfer_size = SIZE_QUAD;
1229	+	break;
1230	+	case 3: // Load Doubleword
1231	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1232	+	transfer_size = SIZE_LONG;
1233	+	register_pair = true;
1234	+	break;
1235	+	case 5: // Store Byte
1236	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1237	+	transfer_size = SIZE_BYTE;
1238	+	break;
1239	+	case 6: // Store Halfword
1240	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1241	+	transfer_size = SIZE_WORD;
1242	+	break;
1243	+	case 4: // Store Word
1244	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1245	+	transfer_size = SIZE_LONG;
1246	+	break;
1247	+	case 14:// Store Extended Word
1248	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1249	+	transfer_size = SIZE_QUAD;
1250	+	break;
1251	+	case 7: // Store Doubleword
1252	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1253	+	transfer_size = SIZE_WORD;
1254	+	register_pair = true;
1255	+	break;
1256	+	}
1257	+
1258	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1259	+	// Unknown machine code, let it crash. Then patch the decoder
1260	+	return false;
1261	+	}
1262	+
1263	+	// Zero target register in case of a load operation
1264	+	const int reg = (opcode >> 25) & 0x1f;
1265	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
1266	+	// FIXME: code to handle local & input registers is not tested
1267	+	if (reg >= 1 && reg <= 7) {
1268	+	// global registers
1269	+	regs[reg - 1 + SPARC_REG_G1] = 0;
1270	+	}
1271	+	else if (reg >= 8 && reg <= 15) {
1272	+	// output registers
1273	+	regs[reg - 8 + SPARC_REG_O0] = 0;
1274	+	}
1275	+	else if (reg >= 16 && reg <= 23) {
1276	+	// local registers (in register windows)
1277	+	if (gwins)
1278	+	gwins->wbuf->rw_local[reg - 16] = 0;
1279	+	else
1280	+	rwin->rw_local[reg - 16] = 0;
1281	+	}
1282	+	else {
1283	+	// input registers (in register windows)
1284	+	if (gwins)
1285	+	gwins->wbuf->rw_in[reg - 24] = 0;
1286	+	else
1287	+	rwin->rw_in[reg - 24] = 0;
1288	+	}
1289	+	}
1290	+
1291	+	#if DEBUG
1292	+	static const char * reg_names[] = {
1293	+	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
1294	+	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
1295	+	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
1296	+	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
1297	+	};
1298	+	printf("%s %s register %s\n",
1299	+	transfer_size == SIZE_BYTE ? "byte" :
1300	+	transfer_size == SIZE_WORD ? "word" :
1301	+	transfer_size == SIZE_LONG ? "long" :
1302	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1303	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1304	+	reg_names[reg]);
1305	+	#endif
1306	+
1307	+	regs[SPARC_REG_PC] += 4;
1308	+	return true;
1309	+	}
1310	+	#endif
1311	+	#endif
1312	+
1313	+	// Decode and skip ARM instruction
1314	+	#if (defined(arm) || defined(__arm__))
1315	+	enum {
1316	+	#if (defined(__linux__))
1317	+	ARM_REG_PC = 15,
1318	+	ARM_REG_CPSR = 16
1319	+	#endif
1320	+	};
1321	+	static bool arm_skip_instruction(unsigned long * regs)
1322	+	{
1323	+	unsigned int * pc = (unsigned int *)regs[ARM_REG_PC];
1324	+
1325	+	if (pc == 0)
1326	+	return false;
1327	+
1328	+	#if DEBUG
1329	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1330	+	#endif
1331	+
1332	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1333	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
1334	+	enum { op_sdt = 1, op_sdth = 2 };
1335	+	int op = 0;
1336	+
1337	+	// Handle load/store instructions only
1338	+	const unsigned int opcode = pc[0];
1339	+	switch ((opcode >> 25) & 7) {
1340	+	case 0: // Halfword and Signed Data Transfer (LDRH, STRH, LDRSB, LDRSH)
1341	+	op = op_sdth;
1342	+	// Determine transfer size (S/H bits)
1343	+	switch ((opcode >> 5) & 3) {
1344	+	case 0: // SWP instruction
1345	+	break;
1346	+	case 1: // Unsigned halfwords
1347	+	case 3: // Signed halfwords
1348	+	transfer_size = SIZE_WORD;
1349	+	break;
1350	+	case 2: // Signed byte
1351	+	transfer_size = SIZE_BYTE;
1352	+	break;
1353	+	}
1354	+	break;
1355	+	case 2:
1356	+	case 3: // Single Data Transfer (LDR, STR)
1357	+	op = op_sdt;
1358	+	// Determine transfer size (B bit)
1359	+	if (((opcode >> 22) & 1) == 1)
1360	+	transfer_size = SIZE_BYTE;
1361	+	else
1362	+	transfer_size = SIZE_LONG;
1363	+	break;
1364	+	default:
1365	+	// FIXME: support load/store mutliple?
1366	+	return false;
1367	+	}
1368	+
1369	+	// Check for invalid transfer size (SWP instruction?)
1370	+	if (transfer_size == SIZE_UNKNOWN)
1371	+	return false;
1372	+
1373	+	// Determine transfer type (L bit)
1374	+	if (((opcode >> 20) & 1) == 1)
1375	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1376	+	else
1377	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1378	+
1379	+	// Compute offset
1380	+	int offset;
1381	+	if (((opcode >> 25) & 1) == 0) {
1382	+	if (op == op_sdt)
1383	+	offset = opcode & 0xfff;
1384	+	else if (op == op_sdth) {
1385	+	int rm = opcode & 0xf;
1386	+	if (((opcode >> 22) & 1) == 0) {
1387	+	// register offset
1388	+	offset = regs[rm];
1389	+	}
1390	+	else {
1391	+	// immediate offset
1392	+	offset = ((opcode >> 4) & 0xf0) | (opcode & 0x0f);
1393	+	}
1394	+	}
1395	+	}
1396	+	else {
1397	+	const int rm = opcode & 0xf;
1398	+	const int sh = (opcode >> 7) & 0x1f;
1399	+	if (((opcode >> 4) & 1) == 1) {
1400	+	// we expect only legal load/store instructions
1401	+	printf("FATAL: invalid shift operand\n");
1402	+	return false;
1403	+	}
1404	+	const unsigned int v = regs[rm];
1405	+	switch ((opcode >> 5) & 3) {
1406	+	case 0: // logical shift left
1407	+	offset = sh ? v << sh : v;
1408	+	break;
1409	+	case 1: // logical shift right
1410	+	offset = sh ? v >> sh : 0;
1411	+	break;
1412	+	case 2: // arithmetic shift right
1413	+	if (sh)
1414	+	offset = ((signed int)v) >> sh;
1415	+	else
1416	+	offset = (v & 0x80000000) ? 0xffffffff : 0;
1417	+	break;
1418	+	case 3: // rotate right
1419	+	if (sh)
1420	+	offset = (v >> sh) | (v << (32 - sh));
1421	+	else
1422	+	offset = (v >> 1) | ((regs[ARM_REG_CPSR] << 2) & 0x80000000);
1423	+	break;
1424	+	}
1425	+	}
1426	+	if (((opcode >> 23) & 1) == 0)
1427	+	offset = -offset;
1428	+
1429	+	int rd = (opcode >> 12) & 0xf;
1430	+	int rn = (opcode >> 16) & 0xf;
1431	+	#if DEBUG
1432	+	static const char * reg_names[] = {
1433	+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1434	+	"r9", "r9", "sl", "fp", "ip", "sp", "lr", "pc"
1435	+	};
1436	+	printf("%s %s register %s\n",
1437	+	transfer_size == SIZE_BYTE ? "byte" :
1438	+	transfer_size == SIZE_WORD ? "word" :
1439	+	transfer_size == SIZE_LONG ? "long" : "unknown",
1440	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1441	+	reg_names[rd]);
1442	+	#endif
1443	+
1444	+	unsigned int base = regs[rn];
1445	+	if (((opcode >> 24) & 1) == 1)
1446	+	base += offset;
1447	+
1448	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD)
1449	+	regs[rd] = 0;
1450	+
1451	+	if (((opcode >> 24) & 1) == 0)                // post-index addressing
1452	+	regs[rn] += offset;
1453	+	else if (((opcode >> 21) & 1) == 1)   // write-back address into base
1454	+	regs[rn] = base;
1455	+
1456	+	regs[ARM_REG_PC] += 4;
1457	+	return true;
1458	+	}
1459	+	#endif
1460	+
1461
1462		// Fallbacks
1463		#ifndef SIGSEGV_FAULT_INSTRUCTION
1464		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
1465		#endif
1466	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
1467	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
1468	+	#endif
1469	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
1470	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
1471	+	#endif
1472
1473		// SIGSEGV recovery supported ?
1474		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 471 | Line 1480 | static bool ix86_skip_instruction(sigseg
1480		*  SIGSEGV global handler
1481		*/
1482
1483	<	#ifdef HAVE_SIGSEGV_RECOVERY
1484	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1483	>	// This function handles the badaccess to memory.
1484	>	// It is called from the signal handler or the exception handler.
1485	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
1486		{
1487		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
1488		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
479	–	bool fault_recovered = false;
1489
1490		// Call user's handler and reinstall the global handler, if required
1491	<	if (sigsegv_user_handler(fault_address, fault_instruction)) {
1492	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1493	<	sigsegv_do_install_handler(sig);
1491	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
1492	>	case SIGSEGV_RETURN_SUCCESS:
1493	>	return true;
1494	>
1495	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1496	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
1497	>	// Call the instruction skipper with the register file
1498	>	// available
1499	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
1500	>	#ifdef HAVE_MACH_EXCEPTIONS
1501	>	// Unlike UNIX signals where the thread state
1502	>	// is modified off of the stack, in Mach we
1503	>	// need to actually call thread_set_state to
1504	>	// have the register values updated.
1505	>	kern_return_t krc;
1506	>
1507	>	krc = thread_set_state(thread,
1508	>	MACHINE_THREAD_STATE, (thread_state_t)state,
1509	>	MACHINE_THREAD_STATE_COUNT);
1510	>	MACH_CHECK_ERROR (thread_get_state, krc);
1511	>	#endif
1512	>	return true;
1513	>	}
1514	>	break;
1515		#endif
1516	<	fault_recovered = true;
1516	>	case SIGSEGV_RETURN_FAILURE:
1517	>	return false;
1518		}
1519	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1520	<	else if (sigsegv_ignore_fault) {
1521	<	// Call the instruction skipper with the register file available
1522	<	if (SIGSEGV_SKIP_INSTRUCTION(fault_instruction, SIGSEGV_REGISTER_FILE))
1523	<	fault_recovered = true;
1519	>
1520	>	// We can't do anything with the fault_address, dump state?
1521	>	if (sigsegv_state_dumper != 0)
1522	>	sigsegv_state_dumper(fault_address, fault_instruction);
1523	>
1524	>	return false;
1525	>	}
1526	>
1527	>
1528	>	/*
1529	>	* There are two mechanisms for handling a bad memory access,
1530	>	* Mach exceptions and UNIX signals. The implementation specific
1531	>	* code appears below. Its reponsibility is to call handle_badaccess
1532	>	* which is the routine that handles the fault in an implementation
1533	>	* agnostic manner. The implementation specific code below is then
1534	>	* reponsible for checking whether handle_badaccess was able
1535	>	* to handle the memory access error and perform any implementation
1536	>	* specific tasks necessary afterwards.
1537	>	*/
1538	>
1539	>	#ifdef HAVE_MACH_EXCEPTIONS
1540	>	/*
1541	>	* We need to forward all exceptions that we do not handle.
1542	>	* This is important, there are many exceptions that may be
1543	>	* handled by other exception handlers. For example debuggers
1544	>	* use exceptions and the exception hander is in another
1545	>	* process in such a case. (Timothy J. Wood states in his
1546	>	* message to the list that he based this code on that from
1547	>	* gdb for Darwin.)
1548	>	*/
1549	>	static inline kern_return_t
1550	>	forward_exception(mach_port_t thread_port,
1551	>	mach_port_t task_port,
1552	>	exception_type_t exception_type,
1553	>	exception_data_t exception_data,
1554	>	mach_msg_type_number_t data_count,
1555	>	ExceptionPorts *oldExceptionPorts)
1556	>	{
1557	>	kern_return_t kret;
1558	>	unsigned int portIndex;
1559	>	mach_port_t port;
1560	>	exception_behavior_t behavior;
1561	>	thread_state_flavor_t flavor;
1562	>	thread_state_t thread_state;
1563	>	mach_msg_type_number_t thread_state_count;
1564	>
1565	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1566	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1567	>	// This handler wants the exception
1568	>	break;
1569	>	}
1570	>	}
1571	>
1572	>	if (portIndex >= oldExceptionPorts->maskCount) {
1573	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1574	>	return KERN_FAILURE;
1575	>	}
1576	>
1577	>	port = oldExceptionPorts->handlers[portIndex];
1578	>	behavior = oldExceptionPorts->behaviors[portIndex];
1579	>	flavor = oldExceptionPorts->flavors[portIndex];
1580	>
1581	>	/*
1582	>	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1583	>	*/
1584	>
1585	>	if (behavior != EXCEPTION_DEFAULT) {
1586	>	thread_state_count = THREAD_STATE_MAX;
1587	>	kret = thread_get_state (thread_port, flavor, thread_state,
1588	>	&thread_state_count);
1589	>	MACH_CHECK_ERROR (thread_get_state, kret);
1590		}
1591	+
1592	+	switch (behavior) {
1593	+	case EXCEPTION_DEFAULT:
1594	+	// fprintf(stderr, "forwarding to exception_raise\n");
1595	+	kret = exception_raise(port, thread_port, task_port, exception_type,
1596	+	exception_data, data_count);
1597	+	MACH_CHECK_ERROR (exception_raise, kret);
1598	+	break;
1599	+	case EXCEPTION_STATE:
1600	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
1601	+	kret = exception_raise_state(port, exception_type, exception_data,
1602	+	data_count, &flavor,
1603	+	thread_state, thread_state_count,
1604	+	thread_state, &thread_state_count);
1605	+	MACH_CHECK_ERROR (exception_raise_state, kret);
1606	+	break;
1607	+	case EXCEPTION_STATE_IDENTITY:
1608	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1609	+	kret = exception_raise_state_identity(port, thread_port, task_port,
1610	+	exception_type, exception_data,
1611	+	data_count, &flavor,
1612	+	thread_state, thread_state_count,
1613	+	thread_state, &thread_state_count);
1614	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1615	+	break;
1616	+	default:
1617	+	fprintf(stderr, "forward_exception got unknown behavior\n");
1618	+	break;
1619	+	}
1620	+
1621	+	if (behavior != EXCEPTION_DEFAULT) {
1622	+	kret = thread_set_state (thread_port, flavor, thread_state,
1623	+	thread_state_count);
1624	+	MACH_CHECK_ERROR (thread_set_state, kret);
1625	+	}
1626	+
1627	+	return KERN_SUCCESS;
1628	+	}
1629	+
1630	+	/*
1631	+	* This is the code that actually handles the exception.
1632	+	* It is called by exc_server. For Darwin 5 Apple changed
1633	+	* this a bit from how this family of functions worked in
1634	+	* Mach. If you are familiar with that it is a little
1635	+	* different. The main variation that concerns us here is
1636	+	* that code is an array of exception specific codes and
1637	+	* codeCount is a count of the number of codes in the code
1638	+	* array. In typical Mach all exceptions have a code
1639	+	* and sub-code. It happens to be the case that for a
1640	+	* EXC_BAD_ACCESS exception the first entry is the type of
1641	+	* bad access that occurred and the second entry is the
1642	+	* faulting address so these entries correspond exactly to
1643	+	* how the code and sub-code are used on Mach.
1644	+	*
1645	+	* This is a MIG interface. No code in Basilisk II should
1646	+	* call this directley. This has to have external C
1647	+	* linkage because that is what exc_server expects.
1648	+	*/
1649	+	kern_return_t
1650	+	catch_exception_raise(mach_port_t exception_port,
1651	+	mach_port_t thread,
1652	+	mach_port_t task,
1653	+	exception_type_t exception,
1654	+	exception_data_t code,
1655	+	mach_msg_type_number_t codeCount)
1656	+	{
1657	+	ppc_thread_state_t state;
1658	+	kern_return_t krc;
1659	+
1660	+	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
1661	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1662	+	return KERN_SUCCESS;
1663	+	}
1664	+
1665	+	// In Mach we do not need to remove the exception handler.
1666	+	// If we forward the exception, eventually some exception handler
1667	+	// will take care of this exception.
1668	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1669	+
1670	+	return krc;
1671	+	}
1672		#endif
1673
1674	<	if (!fault_recovered) {
1675	<	// FAIL: reinstall default handler for "safe" crash
1674	>	#ifdef HAVE_SIGSEGV_RECOVERY
1675	>	// Handle bad memory accesses with signal handler
1676	>	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1677	>	{
1678	>	// Call handler and reinstall the global handler, if required
1679	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1680	>	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1681	>	sigsegv_do_install_handler(sig);
1682	>	#endif
1683	>	return;
1684	>	}
1685	>
1686	>	// Failure: reinstall default handler for "safe" crash
1687		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1688	<	SIGSEGV_ALL_SIGNALS
1688	>	SIGSEGV_ALL_SIGNALS
1689		#undef FAULT_HANDLER
501	–
502	–	// We can't do anything with the fault_address, dump state?
503	–	if (sigsegv_dump_state != 0)
504	–	sigsegv_dump_state(fault_address, fault_instruction);
505	–	}
1690		}
1691		#endif
1692
#	Line 516 | Line 1700 | static bool sigsegv_do_install_handler(i
1700		{
1701		// Setup SIGSEGV handler to process writes to frame buffer
1702		#ifdef HAVE_SIGACTION
1703	<	struct sigaction vosf_sa;
1704	<	sigemptyset(&vosf_sa.sa_mask);
1705	<	vosf_sa.sa_sigaction = sigsegv_handler;
1706	<	vosf_sa.sa_flags = SA_SIGINFO;
1707	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1703	>	struct sigaction sigsegv_sa;
1704	>	sigemptyset(&sigsegv_sa.sa_mask);
1705	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1706	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1707	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1708		#else
1709		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1710		#endif
#	Line 532 | Line 1716 | static bool sigsegv_do_install_handler(i
1716		{
1717		// Setup SIGSEGV handler to process writes to frame buffer
1718		#ifdef HAVE_SIGACTION
1719	<	struct sigaction vosf_sa;
1720	<	sigemptyset(&vosf_sa.sa_mask);
1721	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1719	>	struct sigaction sigsegv_sa;
1720	>	sigemptyset(&sigsegv_sa.sa_mask);
1721	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1722	>	sigsegv_sa.sa_flags = 0;
1723		#if !EMULATED_68K && defined(__NetBSD__)
1724	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1725	<	vosf_sa.sa_flags = SA_ONSTACK;
541	<	#else
542	<	vosf_sa.sa_flags = 0;
1724	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1725	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1726		#endif
1727	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1727	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1728		#else
1729		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1730		#endif
1731		}
1732		#endif
1733
1734	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
1734	>	#if defined(HAVE_MACH_EXCEPTIONS)
1735	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1736		{
1737	<	#ifdef HAVE_SIGSEGV_RECOVERY
1738	<	sigsegv_user_handler = handler;
1737	>	/*
1738	>	* Except for the exception port functions, this should be
1739	>	* pretty much stock Mach. If later you choose to support
1740	>	* other Mach's besides Darwin, just check for __MACH__
1741	>	* here and __APPLE__ where the actual differences are.
1742	>	*/
1743	>	#if defined(__APPLE__) && defined(__MACH__)
1744	>	if (sigsegv_fault_handler != NULL) {
1745	>	sigsegv_fault_handler = handler;
1746	>	return true;
1747	>	}
1748	>
1749	>	kern_return_t krc;
1750	>
1751	>	// create the the exception port
1752	>	krc = mach_port_allocate(mach_task_self(),
1753	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1754	>	if (krc != KERN_SUCCESS) {
1755	>	mach_error("mach_port_allocate", krc);
1756	>	return false;
1757	>	}
1758	>
1759	>	// add a port send right
1760	>	krc = mach_port_insert_right(mach_task_self(),
1761	>	_exceptionPort, _exceptionPort,
1762	>	MACH_MSG_TYPE_MAKE_SEND);
1763	>	if (krc != KERN_SUCCESS) {
1764	>	mach_error("mach_port_insert_right", krc);
1765	>	return false;
1766	>	}
1767	>
1768	>	// get the old exception ports
1769	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1770	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1771	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1772	>	if (krc != KERN_SUCCESS) {
1773	>	mach_error("thread_get_exception_ports", krc);
1774	>	return false;
1775	>	}
1776	>
1777	>	// set the new exception port
1778	>	//
1779	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1780	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1781	>	// message, but it turns out that in the common case this is not
1782	>	// neccessary. If we need it we can later ask for it from the
1783	>	// suspended thread.
1784	>	//
1785	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1786	>	// counter in the thread state.  The comments in the header file
1787	>	// seem to imply that you can count on the GPR's on an exception
1788	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1789	>	// you have to ask for all of the GPR's anyway just to get the
1790	>	// program counter. In any case because of update effective
1791	>	// address from immediate and update address from effective
1792	>	// addresses of ra and rb modes (as good an name as any for these
1793	>	// addressing modes) used in PPC instructions, you will need the
1794	>	// GPR state anyway.
1795	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1796	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1797	>	if (krc != KERN_SUCCESS) {
1798	>	mach_error("thread_set_exception_ports", krc);
1799	>	return false;
1800	>	}
1801	>
1802	>	// create the exception handler thread
1803	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1804	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1805	>	return false;
1806	>	}
1807	>
1808	>	// do not care about the exception thread any longer, let is run standalone
1809	>	(void)pthread_detach(exc_thread);
1810	>
1811	>	sigsegv_fault_handler = handler;
1812	>	return true;
1813	>	#else
1814	>	return false;
1815	>	#endif
1816	>	}
1817	>	#endif
1818	>
1819	>	#ifdef HAVE_WIN32_EXCEPTIONS
1820	>	static LONG WINAPI main_exception_filter(EXCEPTION_POINTERS *ExceptionInfo)
1821	>	{
1822	>	if (sigsegv_fault_handler != NULL
1823	>	&& ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
1824	>	&& ExceptionInfo->ExceptionRecord->NumberParameters == 2
1825	>	&& handle_badaccess(ExceptionInfo))
1826	>	return EXCEPTION_CONTINUE_EXECUTION;
1827	>
1828	>	return EXCEPTION_CONTINUE_SEARCH;
1829	>	}
1830	>
1831	>	#if defined __CYGWIN__ && defined __i386__
1832	>	/* In Cygwin programs, SetUnhandledExceptionFilter has no effect because Cygwin
1833	>	installs a global exception handler.  We have to dig deep in order to install
1834	>	our main_exception_filter.  */
1835	>
1836	>	/* Data structures for the current thread's exception handler chain.
1837	>	On the x86 Windows uses register fs, offset 0 to point to the current
1838	>	exception handler; Cygwin mucks with it, so we must do the same... :-/ */
1839	>
1840	>	/* Magic taken from winsup/cygwin/include/exceptions.h.  */
1841	>
1842	>	struct exception_list {
1843	>	struct exception_list *prev;
1844	>	int (*handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
1845	>	};
1846	>	typedef struct exception_list exception_list;
1847	>
1848	>	/* Magic taken from winsup/cygwin/exceptions.cc.  */
1849	>
1850	>	__asm__ (".equ __except_list,0");
1851	>
1852	>	extern exception_list *_except_list __asm__ ("%fs:__except_list");
1853	>
1854	>	/* For debugging.  _except_list is not otherwise accessible from gdb.  */
1855	>	static exception_list *
1856	>	debug_get_except_list ()
1857	>	{
1858	>	return _except_list;
1859	>	}
1860	>
1861	>	/* Cygwin's original exception handler.  */
1862	>	static int (*cygwin_exception_handler) (EXCEPTION_RECORD *, void *, CONTEXT *, void *);
1863	>
1864	>	/* Our exception handler.  */
1865	>	static int
1866	>	libsigsegv_exception_handler (EXCEPTION_RECORD *exception, void *frame, CONTEXT *context, void *dispatch)
1867	>	{
1868	>	EXCEPTION_POINTERS ExceptionInfo;
1869	>	ExceptionInfo.ExceptionRecord = exception;
1870	>	ExceptionInfo.ContextRecord = context;
1871	>	if (main_exception_filter (&ExceptionInfo) == EXCEPTION_CONTINUE_SEARCH)
1872	>	return cygwin_exception_handler (exception, frame, context, dispatch);
1873	>	else
1874	>	return 0;
1875	>	}
1876	>
1877	>	static void
1878	>	do_install_main_exception_filter ()
1879	>	{
1880	>	/* We cannot insert any handler into the chain, because such handlers
1881	>	must lie on the stack (?).  Instead, we have to replace(!) Cygwin's
1882	>	global exception handler.  */
1883	>	cygwin_exception_handler = _except_list->handler;
1884	>	_except_list->handler = libsigsegv_exception_handler;
1885	>	}
1886	>
1887	>	#else
1888	>
1889	>	static void
1890	>	do_install_main_exception_filter ()
1891	>	{
1892	>	SetUnhandledExceptionFilter ((LPTOP_LEVEL_EXCEPTION_FILTER) &main_exception_filter);
1893	>	}
1894	>	#endif
1895	>
1896	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1897	>	{
1898	>	static bool main_exception_filter_installed = false;
1899	>	if (!main_exception_filter_installed) {
1900	>	do_install_main_exception_filter();
1901	>	main_exception_filter_installed = true;
1902	>	}
1903	>	sigsegv_fault_handler = handler;
1904	>	return true;
1905	>	}
1906	>	#endif
1907	>
1908	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1909	>	{
1910	>	#if defined(HAVE_SIGSEGV_RECOVERY)
1911		bool success = true;
1912		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1913		SIGSEGV_ALL_SIGNALS
1914		#undef FAULT_HANDLER
1915	+	if (success)
1916	+	sigsegv_fault_handler = handler;
1917		return success;
1918	+	#elif defined(HAVE_MACH_EXCEPTIONS) || defined(HAVE_WIN32_EXCEPTIONS)
1919	+	return sigsegv_do_install_handler(handler);
1920		#else
1921		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1922		return false;
#	Line 570 | Line 1930 | bool sigsegv_install_handler(sigsegv_han
1930
1931		void sigsegv_deinstall_handler(void)
1932		{
1933	+	// We do nothing for Mach exceptions, the thread would need to be
1934	+	// suspended if not already so, and we might mess with other
1935	+	// exception handlers that came after we registered ours. There is
1936	+	// no need to remove the exception handler, in fact this function is
1937	+	// not called anywhere in Basilisk II.
1938		#ifdef HAVE_SIGSEGV_RECOVERY
1939	<	sigsegv_user_handler = 0;
1939	>	sigsegv_fault_handler = 0;
1940		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1941		SIGSEGV_ALL_SIGNALS
1942		#undef FAULT_HANDLER
1943		#endif
1944	<	}
1945	<
1946	<
582	<	/*
583	<	*  SIGSEGV ignore state modifier
584	<	*/
585	<
586	<	void sigsegv_set_ignore_state(bool ignore_fault)
587	<	{
588	<	sigsegv_ignore_fault = ignore_fault;
1944	>	#ifdef HAVE_WIN32_EXCEPTIONS
1945	>	sigsegv_fault_handler = NULL;
1946	>	#endif
1947		}
1948
1949
#	Line 593 | Line 1951 | void sigsegv_set_ignore_state(bool ignor
1951		*  Set callback function when we cannot handle the fault
1952		*/
1953
1954	<	void sigsegv_set_dump_state(sigsegv_handler_t handler)
1954	>	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
1955		{
1956	<	sigsegv_dump_state = handler;
1956	>	sigsegv_state_dumper = handler;
1957		}
1958
1959
#	Line 607 | Line 1965 | void sigsegv_set_dump_state(sigsegv_hand
1965		#include <stdio.h>
1966		#include <stdlib.h>
1967		#include <fcntl.h>
1968	+	#ifdef HAVE_SYS_MMAN_H
1969		#include <sys/mman.h>
1970	+	#endif
1971		#include "vm_alloc.h"
1972
1973	+	const int REF_INDEX = 123;
1974	+	const int REF_VALUE = 45;
1975	+
1976		static int page_size;
1977		static volatile char * page = 0;
1978		static volatile int handler_called = 0;
1979
1980	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1980	>	#ifdef __GNUC__
1981	>	// Code range where we expect the fault to come from
1982	>	static void *b_region, *e_region;
1983	>	#endif
1984	>
1985	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1986		{
1987	+	#if DEBUG
1988	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
1989	+	printf("expected fault at %p\n", page + REF_INDEX);
1990	+	#ifdef __GNUC__
1991	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
1992	+	#endif
1993	+	#endif
1994		handler_called++;
1995	<	if ((fault_address - 123) != page)
1996	<	exit(1);
1995	>	if ((fault_address - REF_INDEX) != page)
1996	>	exit(10);
1997	>	#ifdef __GNUC__
1998	>	// Make sure reported fault instruction address falls into
1999	>	// expected code range
2000	>	if (instruction_address != SIGSEGV_INVALID_PC
2001	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
2002	>	(instruction_address >= (sigsegv_address_t)e_region)))
2003	>	exit(11);
2004	>	#endif
2005		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
2006	<	exit(1);
2007	<	return true;
2006	>	exit(12);
2007	>	return SIGSEGV_RETURN_SUCCESS;
2008		}
2009
2010		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2011	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2011	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
2012		{
2013	<	return false;
2013	>	#if DEBUG
2014	>	printf("sigsegv_insn_handler(%p, %p)\n", fault_address, instruction_address);
2015	>	#endif
2016	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
2017	>	#ifdef __GNUC__
2018	>	// Make sure reported fault instruction address falls into
2019	>	// expected code range
2020	>	if (instruction_address != SIGSEGV_INVALID_PC
2021	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
2022	>	(instruction_address >= (sigsegv_address_t)e_region)))
2023	>	return SIGSEGV_RETURN_FAILURE;
2024	>	#endif
2025	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
2026	>	}
2027	>
2028	>	return SIGSEGV_RETURN_FAILURE;
2029	>	}
2030	>
2031	>	// More sophisticated tests for instruction skipper
2032	>	static bool arch_insn_skipper_tests()
2033	>	{
2034	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
2035	>	static const unsigned char code[] = {
2036	>	0x8a, 0x00,                    // mov    (%eax),%al
2037	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
2038	>	0x88, 0x20,                    // mov    %ah,(%eax)
2039	>	0x88, 0x08,                    // mov    %cl,(%eax)
2040	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
2041	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
2042	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
2043	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
2044	>	0x8b, 0x00,                    // mov    (%eax),%eax
2045	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
2046	>	0x89, 0x00,                    // mov    %eax,(%eax)
2047	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
2048	>	#if defined(__x86_64__)
2049	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
2050	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
2051	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
2052	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
2053	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
2054	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
2055	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
2056	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
2057	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
2058	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
2059	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
2060	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
2061	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
2062	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
2063	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
2064	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
2065	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
2066	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
2067	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
2068	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
2069	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
2070	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
2071	>	#endif
2072	>	0                              // end
2073	>	};
2074	>	const int N_REGS = 20;
2075	>	unsigned long regs[N_REGS];
2076	>	for (int i = 0; i < N_REGS; i++)
2077	>	regs[i] = i;
2078	>	const unsigned long start_code = (unsigned long)&code;
2079	>	regs[X86_REG_EIP] = start_code;
2080	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
2081	>	&& ix86_skip_instruction(regs))
2082	>	; /* simply iterate */
2083	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
2084	>	#endif
2085	>	return true;
2086		}
2087		#endif
2088
#	Line 636 | Line 2091 | int main(void)
2091		if (vm_init() < 0)
2092		return 1;
2093
2094	+	#ifdef _WIN32
2095	+	page_size = 4096;
2096	+	#else
2097		page_size = getpagesize();
2098	+	#endif
2099		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
2100	<	return 1;
2100	>	return 2;
2101
2102	+	memset((void *)page, 0, page_size);
2103		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
2104	<	return 1;
2104	>	return 3;
2105
2106		if (!sigsegv_install_handler(sigsegv_test_handler))
2107	<	return 1;
648	<
649	<	page[123] = 45;
650	<	page[123] = 45;
2107	>	return 4;
2108
2109	+	#ifdef __GNUC__
2110	+	b_region = &&L_b_region1;
2111	+	e_region = &&L_e_region1;
2112	+	#endif
2113	+	L_b_region1:
2114	+	page[REF_INDEX] = REF_VALUE;
2115	+	if (page[REF_INDEX] != REF_VALUE)
2116	+	exit(20);
2117	+	page[REF_INDEX] = REF_VALUE;
2118	+	L_e_region1:
2119	+
2120		if (handler_called != 1)
2121	<	return 1;
2121	>	return 5;
2122
2123		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
2124		if (!sigsegv_install_handler(sigsegv_insn_handler))
2125	<	return 1;
2125	>	return 6;
2126
2127	<	if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0)
2128	<	return 1;
2127	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
2128	>	return 7;
2129
2130		for (int i = 0; i < page_size; i++)
2131		page[i] = (i + 1) % page_size;
2132
2133		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
2134	<	return 1;
2134	>	return 8;
2135
668	–	sigsegv_set_ignore_state(true);
669	–
2136		#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
2137	<	const unsigned int TAG = 0x12345678;                    \
2137	>	const unsigned long TAG = 0x12345678 |                  \
2138	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
2139		TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
2140	<	volatile unsigned int effect = data + TAG;              \
2140	>	volatile unsigned long effect = data + TAG;             \
2141		if (effect != TAG)                                                              \
2142	<	return 1;                                                                       \
2142	>	return 9;                                                                       \
2143		} while (0)
2144
2145	+	#ifdef __GNUC__
2146	+	b_region = &&L_b_region2;
2147	+	e_region = &&L_e_region2;
2148	+	#endif
2149	+	L_b_region2:
2150		TEST_SKIP_INSTRUCTION(unsigned char);
2151		TEST_SKIP_INSTRUCTION(unsigned short);
2152		TEST_SKIP_INSTRUCTION(unsigned int);
2153	+	TEST_SKIP_INSTRUCTION(unsigned long);
2154	+	TEST_SKIP_INSTRUCTION(signed char);
2155	+	TEST_SKIP_INSTRUCTION(signed short);
2156	+	TEST_SKIP_INSTRUCTION(signed int);
2157	+	TEST_SKIP_INSTRUCTION(signed long);
2158	+	L_e_region2:
2159	+
2160	+	if (!arch_insn_skipper_tests())
2161	+	return 20;
2162		#endif
2163
2164		vm_exit();

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