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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.7 by cebix, 2002-01-15T14:58:37Z vs.
Revision 1.18 by gbeauche, 2002-05-20T18:12:01Z

#	Line 40 | Line 40
40		// Type of the system signal handler
41		typedef RETSIGTYPE (*signal_handler)(int);
42
43	+	// Is the fault to be ignored?
44	+	static bool sigsegv_ignore_fault = false;
45	+
46		// User's SIGSEGV handler
47	<	static sigsegv_handler_t sigsegv_user_handler = 0;
47	>	static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
48	>
49	>	// Function called to dump state if we can't handle the fault
50	>	static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
51
52		// Actual SIGSEGV handler installer
53		static bool sigsegv_do_install_handler(int sig);
54
55
56		/*
57	+	*  Instruction decoding aids
58	+	*/
59	+
60	+	// Transfer type
61	+	enum transfer_type_t {
62	+	TYPE_UNKNOWN,
63	+	TYPE_LOAD,
64	+	TYPE_STORE
65	+	};
66	+
67	+	// Transfer size
68	+	enum transfer_size_t {
69	+	SIZE_UNKNOWN,
70	+	SIZE_BYTE,
71	+	SIZE_WORD,
72	+	SIZE_LONG
73	+	};
74	+
75	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
76	+	// Addressing mode
77	+	enum addressing_mode_t {
78	+	MODE_UNKNOWN,
79	+	MODE_NORM,
80	+	MODE_U,
81	+	MODE_X,
82	+	MODE_UX
83	+	};
84	+
85	+	// Decoded instruction
86	+	struct instruction_t {
87	+	transfer_type_t         transfer_type;
88	+	transfer_size_t         transfer_size;
89	+	addressing_mode_t       addr_mode;
90	+	unsigned int            addr;
91	+	char                            ra, rd;
92	+	};
93	+
94	+	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned int * gpr)
95	+	{
96	+	// Get opcode and divide into fields
97	+	unsigned int opcode = *((unsigned int *)nip);
98	+	unsigned int primop = opcode >> 26;
99	+	unsigned int exop = (opcode >> 1) & 0x3ff;
100	+	unsigned int ra = (opcode >> 16) & 0x1f;
101	+	unsigned int rb = (opcode >> 11) & 0x1f;
102	+	unsigned int rd = (opcode >> 21) & 0x1f;
103	+	signed int imm = (signed short)(opcode & 0xffff);
104	+
105	+	// Analyze opcode
106	+	transfer_type_t transfer_type = TYPE_UNKNOWN;
107	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
108	+	addressing_mode_t addr_mode = MODE_UNKNOWN;
109	+	switch (primop) {
110	+	case 31:
111	+	switch (exop) {
112	+	case 23:        // lwzx
113	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
114	+	case 55:        // lwzux
115	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
116	+	case 87:        // lbzx
117	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
118	+	case 119:       // lbzux
119	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
120	+	case 151:       // stwx
121	+	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
122	+	case 183:       // stwux
123	+	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
124	+	case 215:       // stbx
125	+	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
126	+	case 247:       // stbux
127	+	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
128	+	case 279:       // lhzx
129	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
130	+	case 311:       // lhzux
131	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
132	+	case 343:       // lhax
133	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
134	+	case 375:       // lhaux
135	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
136	+	case 407:       // sthx
137	+	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
138	+	case 439:       // sthux
139	+	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
140	+	}
141	+	break;
142	+
143	+	case 32:        // lwz
144	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
145	+	case 33:        // lwzu
146	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
147	+	case 34:        // lbz
148	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
149	+	case 35:        // lbzu
150	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
151	+	case 36:        // stw
152	+	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
153	+	case 37:        // stwu
154	+	transfer_type = TYPE_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
155	+	case 38:        // stb
156	+	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
157	+	case 39:        // stbu
158	+	transfer_type = TYPE_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
159	+	case 40:        // lhz
160	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
161	+	case 41:        // lhzu
162	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
163	+	case 42:        // lha
164	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
165	+	case 43:        // lhau
166	+	transfer_type = TYPE_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
167	+	case 44:        // sth
168	+	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
169	+	case 45:        // sthu
170	+	transfer_type = TYPE_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
171	+	}
172	+
173	+	// Calculate effective address
174	+	unsigned int addr = 0;
175	+	switch (addr_mode) {
176	+	case MODE_X:
177	+	case MODE_UX:
178	+	if (ra == 0)
179	+	addr = gpr[rb];
180	+	else
181	+	addr = gpr[ra] + gpr[rb];
182	+	break;
183	+	case MODE_NORM:
184	+	case MODE_U:
185	+	if (ra == 0)
186	+	addr = (signed int)(signed short)imm;
187	+	else
188	+	addr = gpr[ra] + (signed int)(signed short)imm;
189	+	break;
190	+	default:
191	+	break;
192	+	}
193	+
194	+	// Commit decoded instruction
195	+	instruction->addr = addr;
196	+	instruction->addr_mode = addr_mode;
197	+	instruction->transfer_type = transfer_type;
198	+	instruction->transfer_size = transfer_size;
199	+	instruction->ra = ra;
200	+	instruction->rd = rd;
201	+	}
202	+	#endif
203	+
204	+
205	+	/*
206		*  OS-dependant SIGSEGV signals support section
207		*/
208
209		#if HAVE_SIGINFO_T
210		// Generic extended signal handler
211	+	#if defined(__NetBSD__) || defined(__FreeBSD__)
212	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
213	+	#else
214		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
215	+	#endif
216		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
217		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
218	+	#if (defined(i386) || defined(__i386__))
219	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
220	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned int *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
221	+	/* (gb) Disable because this would hang configure script for some reason
222	+	* though standalone testing gets it right. Any idea why?
223	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
224	+	*/
225	+	#endif
226		#if defined(__linux__)
227		#if (defined(i386) || defined(__i386__))
228		#include <sys/ucontext.h>
229	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
229	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
230	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
231	>	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)SIGSEGV_CONTEXT_REGS
232	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
233		#endif
234		#if (defined(ia64) || defined(__ia64__))
235		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
236		#endif
237	+	#if (defined(powerpc) || defined(__powerpc__))
238	+	#include <sys/ucontext.h>
239	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
240	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
241	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
242	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
243	+	#endif
244		#endif
245		#endif
246
#	Line 76 | Line 253 | static bool sigsegv_do_install_handler(i
253		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
254		#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
255		#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
256	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)(&scs)
257	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
258		#endif
259		#if (defined(sparc) || defined(__sparc__))
260		#include <asm/sigcontext.h>
#	Line 87 | Line 266 | static bool sigsegv_do_install_handler(i
266		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
267		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
268		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
269	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
270	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
271		#endif
272		#if (defined(alpha) || defined(__alpha__))
273		#include <asm/sigcontext.h>
#	Line 107 | Line 288 | static sigsegv_address_t get_fault_addre
288
289		// Irix 5 or 6 on MIPS
290		#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
291	+	#include <ucontext.h>
292		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
293		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
294		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
295		#endif
296
297	+	// HP-UX
298	+	#if (defined(hpux) || defined(__hpux__))
299	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
300	+	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
301	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
302	+	#endif
303	+
304		// OSF/1 on Alpha
305		#if defined(__osf__)
306	+	#include <ucontext.h>
307		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
308		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
309		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
#	Line 131 | Line 321 | static sigsegv_address_t get_fault_addre
321		#if (defined(m68k) || defined(__m68k__))
322		#include <m68k/frame.h>
323		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
324	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
135	<	struct sigstate {                                                                                                                                                                       \
136	<	int ss_flags;                                                                                                                                                                   \
137	<	struct frame ss_frame;                                                                                                                                                  \
138	<	};                                                                                                                                                                                                      \
139	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
140	<	char *fault_addr;                                                                                                                                                                       \
141	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
142	<	case 7:         /* 68040 access error */                                                                                                                                \
143	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
144	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
145	<	break;                                                                                                                                                                                  \
146	<	default:                                                                                                                                                                                        \
147	<	fault_addr = (char *)code;                                                                                                                                              \
148	<	break;                                                                                                                                                                                  \
149	<	}                                                                                                                                                                                                       \
150	<	fault_addr;                                                                                                                                                                                     \
151	<	})
324	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
325		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
326	+
327	+	// Use decoding scheme from BasiliskII/m68k native
328	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
329	+	{
330	+	struct sigstate {
331	+	int ss_flags;
332	+	struct frame ss_frame;
333	+	};
334	+	struct sigstate *state = (struct sigstate *)scp->sc_ap;
335	+	char *fault_addr;
336	+	switch (state->ss_frame.f_format) {
337	+	case 7:         /* 68040 access error */
338	+	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
339	+	fault_addr = state->ss_frame.f_fmt7.f_fa;
340	+	break;
341	+	default:
342	+	fault_addr = (char *)code;
343	+	break;
344	+	}
345	+	return (sigsegv_address_t)fault_addr;
346	+	}
347		#else
348		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
349		#define SIGSEGV_FAULT_ADDRESS                   addr
#	Line 164 | Line 358 | static sigsegv_address_t get_fault_addre
358		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
359		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
360		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
361	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
362	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
363
364	<	// From Boehm's GC 6.0alpha8
169	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
170	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
171	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
172	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
173	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
174	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
175	<
364	>	// Use decoding scheme from SheepShaver
365		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
366		{
367	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
368	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
369	<	int            disp = 0, tmp;
370	<	unsigned int   baseA = 0, baseB = 0;
371	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
372	<
373	<	switch(EXTRACT_OP1(instr)) {
374	<	case 38:   /* stb */
375	<	case 39:   /* stbu */
376	<	case 54:   /* stfd */
377	<	case 55:   /* stfdu */
378	<	case 52:   /* stfs */
379	<	case 53:   /* stfsu */
380	<	case 44:   /* sth */
381	<	case 45:   /* sthu */
382	<	case 47:   /* stmw */
383	<	case 36:   /* stw */
384	<	case 37:   /* stwu */
385	<	tmp = EXTRACT_REGA(instr);
386	<	if(tmp > 0)
387	<	baseA = regs[tmp];
388	<	disp = EXTRACT_DISP(instr);
367	>	unsigned int   nip = (unsigned int) scp->sc_ir;
368	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
369	>	instruction_t  instr;
370	>
371	>	powerpc_decode_instruction(&instr, nip, gpr);
372	>	return (sigsegv_address_t)instr.addr;
373	>	}
374	>	#endif
375	>	#endif
376	>	#endif
377	>
378	>
379	>	/*
380	>	*  Instruction skipping
381	>	*/
382	>
383	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
384	>	// Decode and skip X86 instruction
385	>	#if (defined(i386) || defined(__i386__))
386	>	#if defined(__linux__)
387	>	enum {
388	>	X86_REG_EIP = 14,
389	>	X86_REG_EAX = 11,
390	>	X86_REG_ECX = 10,
391	>	X86_REG_EDX = 9,
392	>	X86_REG_EBX = 8,
393	>	X86_REG_ESP = 7,
394	>	X86_REG_EBP = 6,
395	>	X86_REG_ESI = 5,
396	>	X86_REG_EDI = 4
397	>	};
398	>	#endif
399	>	#if defined(__NetBSD__) || defined(__FreeBSD__)
400	>	enum {
401	>	X86_REG_EIP = 10,
402	>	X86_REG_EAX = 7,
403	>	X86_REG_ECX = 6,
404	>	X86_REG_EDX = 5,
405	>	X86_REG_EBX = 4,
406	>	X86_REG_ESP = 13,
407	>	X86_REG_EBP = 2,
408	>	X86_REG_ESI = 1,
409	>	X86_REG_EDI = 0
410	>	};
411	>	#endif
412	>	// FIXME: this is partly redundant with the instruction decoding phase
413	>	// to discover transfer type and register number
414	>	static inline int ix86_step_over_modrm(unsigned char * p)
415	>	{
416	>	int mod = (p[0] >> 6) & 3;
417	>	int rm = p[0] & 7;
418	>	int offset = 0;
419	>
420	>	// ModR/M Byte
421	>	switch (mod) {
422	>	case 0: // [reg]
423	>	if (rm == 5) return 4; // disp32
424		break;
425	<	case 31:
426	<	switch(EXTRACT_OP2(instr)) {
427	<	case 86:    /* dcbf */
428	<	case 54:    /* dcbst */
429	<	case 1014:  /* dcbz */
430	<	case 247:   /* stbux */
431	<	case 215:   /* stbx */
432	<	case 759:   /* stfdux */
433	<	case 727:   /* stfdx */
434	<	case 983:   /* stfiwx */
435	<	case 695:   /* stfsux */
436	<	case 663:   /* stfsx */
437	<	case 918:   /* sthbrx */
438	<	case 439:   /* sthux */
439	<	case 407:   /* sthx */
440	<	case 661:   /* stswx */
441	<	case 662:   /* stwbrx */
442	<	case 150:   /* stwcx. */
443	<	case 183:   /* stwux */
444	<	case 151:   /* stwx */
445	<	case 135:   /* stvebx */
446	<	case 167:   /* stvehx */
447	<	case 199:   /* stvewx */
448	<	case 231:   /* stvx */
449	<	case 487:   /* stvxl */
450	<	tmp = EXTRACT_REGA(instr);
451	<	if(tmp > 0)
452	<	baseA = regs[tmp];
453	<	baseB = regs[EXTRACT_REGC(instr)];
454	<	/* determine Altivec alignment mask */
455	<	switch(EXTRACT_OP2(instr)) {
456	<	case 167:   /* stvehx */
457	<	alignmask = 0xFFFFFFFE;
458	<	break;
459	<	case 199:   /* stvewx */
460	<	alignmask = 0xFFFFFFFC;
461	<	break;
462	<	case 231:   /* stvx */
463	<	alignmask = 0xFFFFFFF0;
464	<	break;
465	<	case 487:  /* stvxl */
466	<	alignmask = 0xFFFFFFF0;
467	<	break;
468	<	}
425	>	case 1: // disp8[reg]
426	>	offset = 1;
427	>	break;
428	>	case 2: // disp32[reg]
429	>	offset = 4;
430	>	break;
431	>	case 3: // register
432	>	return 0;
433	>	}
434	>
435	>	// SIB Byte
436	>	if (rm == 4) {
437	>	if (mod == 0 && (p[1] & 7) == 5)
438	>	offset = 5; // disp32[index]
439	>	else
440	>	offset++;
441	>	}
442	>
443	>	return offset;
444	>	}
445	>
446	>	static bool ix86_skip_instruction(unsigned int * regs)
447	>	{
448	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
449	>
450	>	if (eip == 0)
451	>	return false;
452	>
453	>	transfer_type_t transfer_type = TYPE_UNKNOWN;
454	>	transfer_size_t transfer_size = SIZE_LONG;
455	>
456	>	int reg = -1;
457	>	int len = 0;
458	>
459	>	// Operand size prefix
460	>	if (*eip == 0x66) {
461	>	eip++;
462	>	len++;
463	>	transfer_size = SIZE_WORD;
464	>	}
465	>
466	>	// Decode instruction
467	>	switch (eip[0]) {
468	>	case 0x0f:
469	>	switch (eip[1]) {
470	>	case 0xb6: // MOVZX r32, r/m8
471	>	case 0xb7: // MOVZX r32, r/m16
472	>	switch (eip[2] & 0xc0) {
473	>	case 0x80:
474	>	reg = (eip[2] >> 3) & 7;
475	>	transfer_type = TYPE_LOAD;
476	>	break;
477	>	case 0x40:
478	>	reg = (eip[2] >> 3) & 7;
479	>	transfer_type = TYPE_LOAD;
480	>	break;
481	>	case 0x00:
482	>	reg = (eip[2] >> 3) & 7;
483	>	transfer_type = TYPE_LOAD;
484	>	break;
485	>	}
486	>	len += 3 + ix86_step_over_modrm(eip + 2);
487	>	break;
488	>	}
489	>	break;
490	>	case 0x8a: // MOV r8, r/m8
491	>	transfer_size = SIZE_BYTE;
492	>	case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
493	>	switch (eip[1] & 0xc0) {
494	>	case 0x80:
495	>	reg = (eip[1] >> 3) & 7;
496	>	transfer_type = TYPE_LOAD;
497		break;
498	<	case 725:   /* stswi */
499	<	tmp = EXTRACT_REGA(instr);
500	<	if(tmp > 0)
249	<	baseA = regs[tmp];
498	>	case 0x40:
499	>	reg = (eip[1] >> 3) & 7;
500	>	transfer_type = TYPE_LOAD;
501		break;
502	<	default:   /* ignore instruction */
503	<	return 0;
502	>	case 0x00:
503	>	reg = (eip[1] >> 3) & 7;
504	>	transfer_type = TYPE_LOAD;
505		break;
506		}
507	+	len += 2 + ix86_step_over_modrm(eip + 1);
508		break;
509	<	default:   /* ignore instruction */
510	<	return 0;
509	>	case 0x88: // MOV r/m8, r8
510	>	transfer_size = SIZE_BYTE;
511	>	case 0x89: // MOV r/m32, r32 (or 16-bit operation)
512	>	switch (eip[1] & 0xc0) {
513	>	case 0x80:
514	>	reg = (eip[1] >> 3) & 7;
515	>	transfer_type = TYPE_STORE;
516	>	break;
517	>	case 0x40:
518	>	reg = (eip[1] >> 3) & 7;
519	>	transfer_type = TYPE_STORE;
520	>	break;
521	>	case 0x00:
522	>	reg = (eip[1] >> 3) & 7;
523	>	transfer_type = TYPE_STORE;
524	>	break;
525	>	}
526	>	len += 2 + ix86_step_over_modrm(eip + 1);
527		break;
528		}
529	+
530	+	if (transfer_type == TYPE_UNKNOWN) {
531	+	// Unknown machine code, let it crash. Then patch the decoder
532	+	return false;
533	+	}
534	+
535	+	if (transfer_type == TYPE_LOAD && reg != -1) {
536	+	static const int x86_reg_map[8] = {
537	+	X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
538	+	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
539	+	};
540	+
541	+	if (reg < 0 || reg >= 8)
542	+	return false;
543	+
544	+	int rloc = x86_reg_map[reg];
545	+	switch (transfer_size) {
546	+	case SIZE_BYTE:
547	+	regs[rloc] = (regs[rloc] & ~0xff);
548	+	break;
549	+	case SIZE_WORD:
550	+	regs[rloc] = (regs[rloc] & ~0xffff);
551	+	break;
552	+	case SIZE_LONG:
553	+	regs[rloc] = 0;
554	+	break;
555	+	}
556	+	}
557	+
558	+	#if DEBUG
559	+	printf("%08x: %s %s access", regs[X86_REG_EIP],
560	+	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
561	+	transfer_type == TYPE_LOAD ? "read" : "write");
562
563	<	addr = (baseA + baseB) + disp;
564	<	addr &= alignmask;
565	<	return (sigsegv_address_t)addr;
563	>	if (reg != -1) {
564	>	static const char * x86_reg_str_map[8] = {
565	>	"eax", "ecx", "edx", "ebx",
566	>	"esp", "ebp", "esi", "edi"
567	>	};
568	>	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
569	>	}
570	>	printf(", %d bytes instruction\n", len);
571	>	#endif
572	>
573	>	regs[X86_REG_EIP] += len;
574	>	return true;
575		}
576		#endif
577	+
578	+	// Decode and skip PPC instruction
579	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
580	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
581	+	{
582	+	instruction_t instr;
583	+	powerpc_decode_instruction(&instr, *nip_p, regs);
584	+
585	+	if (instr.transfer_type == TYPE_UNKNOWN) {
586	+	// Unknown machine code, let it crash. Then patch the decoder
587	+	return false;
588	+	}
589	+
590	+	#if DEBUG
591	+	printf("%08x: %s %s access", *nip_p,
592	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
593	+	instr.transfer_type == TYPE_LOAD ? "read" : "write");
594	+
595	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
596	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
597	+	if (instr.transfer_type == TYPE_LOAD)
598	+	printf(" r%d (rd = 0)\n", instr.rd);
599	+	#endif
600	+
601	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
602	+	regs[instr.ra] = instr.addr;
603	+	if (instr.transfer_type == TYPE_LOAD)
604	+	regs[instr.rd] = 0;
605	+
606	+	*nip_p += 4;
607	+	return true;
608	+	}
609		#endif
610		#endif
611
#	Line 284 | Line 627 | static sigsegv_address_t get_fault_addre
627		#ifdef HAVE_SIGSEGV_RECOVERY
628		static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
629		{
630	+	sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
631	+	sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
632	+	bool fault_recovered = false;
633	+
634		// Call user's handler and reinstall the global handler, if required
635	<	if (sigsegv_user_handler((sigsegv_address_t)SIGSEGV_FAULT_ADDRESS, (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION)) {
635	>	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
636		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
637		sigsegv_do_install_handler(sig);
638		#endif
639	+	fault_recovered = true;
640	+	}
641	+	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
642	+	else if (sigsegv_ignore_fault) {
643	+	// Call the instruction skipper with the register file available
644	+	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
645	+	fault_recovered = true;
646		}
647	<	else {
647	>	#endif
648	>
649	>	if (!fault_recovered) {
650		// FAIL: reinstall default handler for "safe" crash
651		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
652		SIGSEGV_ALL_SIGNALS
653		#undef FAULT_HANDLER
654	+
655	+	// We can't do anything with the fault_address, dump state?
656	+	if (sigsegv_state_dumper != 0)
657	+	sigsegv_state_dumper(fault_address, fault_instruction);
658		}
659		}
660		#endif
#	Line 341 | Line 701 | static bool sigsegv_do_install_handler(i
701		}
702		#endif
703
704	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
704	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
705		{
706		#ifdef HAVE_SIGSEGV_RECOVERY
707	<	sigsegv_user_handler = handler;
707	>	sigsegv_fault_handler = handler;
708		bool success = true;
709		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
710		SIGSEGV_ALL_SIGNALS
#	Line 364 | Line 724 | bool sigsegv_install_handler(sigsegv_han
724		void sigsegv_deinstall_handler(void)
725		{
726		#ifdef HAVE_SIGSEGV_RECOVERY
727	<	sigsegv_user_handler = 0;
727	>	sigsegv_fault_handler = 0;
728		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
729		SIGSEGV_ALL_SIGNALS
730		#undef FAULT_HANDLER
731		#endif
732		}
733
734	+
735	+	/*
736	+	*  SIGSEGV ignore state modifier
737	+	*/
738	+
739	+	void sigsegv_set_ignore_state(bool ignore_fault)
740	+	{
741	+	sigsegv_ignore_fault = ignore_fault;
742	+	}
743	+
744	+
745	+	/*
746	+	*  Set callback function when we cannot handle the fault
747	+	*/
748	+
749	+	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
750	+	{
751	+	sigsegv_state_dumper = handler;
752	+	}
753	+
754	+
755		/*
756		*  Test program used for configure/test
757		*/
#	Line 396 | Line 777 | static bool sigsegv_test_handler(sigsegv
777		return true;
778		}
779
780	+	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
781	+	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
782	+	{
783	+	return false;
784	+	}
785	+	#endif
786	+
787		int main(void)
788		{
789		if (vm_init() < 0)
#	Line 417 | Line 805 | int main(void)
805		if (handler_called != 1)
806		return 1;
807
808	+	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
809	+	if (!sigsegv_install_handler(sigsegv_insn_handler))
810	+	return 1;
811	+
812	+	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
813	+	return 1;
814	+
815	+	for (int i = 0; i < page_size; i++)
816	+	page[i] = (i + 1) % page_size;
817	+
818	+	if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
819	+	return 1;
820	+
821	+	sigsegv_set_ignore_state(true);
822	+
823	+	#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
824	+	const unsigned int TAG = 0x12345678;                    \
825	+	TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
826	+	volatile unsigned int effect = data + TAG;              \
827	+	if (effect != TAG)                                                              \
828	+	return 1;                                                                       \
829	+	} while (0)
830	+
831	+	TEST_SKIP_INSTRUCTION(unsigned char);
832	+	TEST_SKIP_INSTRUCTION(unsigned short);
833	+	TEST_SKIP_INSTRUCTION(unsigned int);
834	+	#endif
835	+
836		vm_exit();
837		return 0;
838		}

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