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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.11 by gbeauche, 2002-05-12T13:51:22Z vs.
Revision 1.23 by gbeauche, 2003-08-17T10:52:52Z

#	Line 29 \| Line 29
29		#include "config.h"
30		#endif
31
32	+	#include <list>
33		#include <signal.h>
34		#include "sigsegv.h"
35
36	+	#ifndef NO_STD_NAMESPACE
37	+	using std::list;
38	+	#endif
39	+
40		// Return value type of a signal handler (standard type if not defined)
41		#ifndef RETSIGTYPE
42		#define RETSIGTYPE void
#	Line 40 \| Line 45
45		// Type of the system signal handler
46		typedef RETSIGTYPE (*signal_handler)(int);
47
48	<	// Is the fault to be ignored?
49	<	static bool sigsegv_ignore_fault = false;
48	>	// Ignore range chain
49	>	struct ignore_range_t {
50	>	sigsegv_address_t start;
51	>	unsigned long length;
52	>	int transfer_type;
53	>	};
54	>
55	>	typedef list<ignore_range_t> ignore_range_list_t;
56	>	ignore_range_list_t sigsegv_ignore_ranges;
57
58		// User's SIGSEGV handler
59	<	static sigsegv_handler_t sigsegv_user_handler = 0;
59	>	static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
60
61		// Function called to dump state if we can't handle the fault
62	<	static sigsegv_handler_t sigsegv_dump_state = 0;
62	>	static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
63
64		// Actual SIGSEGV handler installer
65		static bool sigsegv_do_install_handler(int sig);
66
67	+	// Find ignore range matching address
68	+	static inline ignore_range_list_t::iterator sigsegv_find_ignore_range(sigsegv_address_t address)
69	+	{
70	+	ignore_range_list_t::iterator it;
71	+	for (it = sigsegv_ignore_ranges.begin(); it != sigsegv_ignore_ranges.end(); it++)
72	+	if (address >= it->start && address < it->start + it->length)
73	+	break;
74	+	return it;
75	+	}
76	+
77	+
78	+	/*
79	+	* Instruction decoding aids
80	+	*/
81	+
82	+	// Transfer size
83	+	enum transfer_size_t {
84	+	SIZE_UNKNOWN,
85	+	SIZE_BYTE,
86	+	SIZE_WORD,
87	+	SIZE_LONG
88	+	};
89	+
90	+	// Transfer type
91	+	typedef sigsegv_transfer_type_t transfer_type_t;
92	+
93	+	#if (defined(powerpc) \|\| defined(__powerpc__) \|\| defined(__ppc__))
94	+	// Addressing mode
95	+	enum addressing_mode_t {
96	+	MODE_UNKNOWN,
97	+	MODE_NORM,
98	+	MODE_U,
99	+	MODE_X,
100	+	MODE_UX
101	+	};
102	+
103	+	// Decoded instruction
104	+	struct instruction_t {
105	+	transfer_type_t transfer_type;
106	+	transfer_size_t transfer_size;
107	+	addressing_mode_t addr_mode;
108	+	unsigned int addr;
109	+	char ra, rd;
110	+	};
111	+
112	+	static void powerpc_decode_instruction(instruction_t instruction, unsigned int nip, unsigned int gpr)
113	+	{
114	+	// Get opcode and divide into fields
115	+	unsigned int opcode = ((unsigned int )nip);
116	+	unsigned int primop = opcode >> 26;
117	+	unsigned int exop = (opcode >> 1) & 0x3ff;
118	+	unsigned int ra = (opcode >> 16) & 0x1f;
119	+	unsigned int rb = (opcode >> 11) & 0x1f;
120	+	unsigned int rd = (opcode >> 21) & 0x1f;
121	+	signed int imm = (signed short)(opcode & 0xffff);
122	+
123	+	// Analyze opcode
124	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
125	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
126	+	addressing_mode_t addr_mode = MODE_UNKNOWN;
127	+	switch (primop) {
128	+	case 31:
129	+	switch (exop) {
130	+	case 23: // lwzx
131	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
132	+	case 55: // lwzux
133	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
134	+	case 87: // lbzx
135	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
136	+	case 119: // lbzux
137	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
138	+	case 151: // stwx
139	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
140	+	case 183: // stwux
141	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
142	+	case 215: // stbx
143	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
144	+	case 247: // stbux
145	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
146	+	case 279: // lhzx
147	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
148	+	case 311: // lhzux
149	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
150	+	case 343: // lhax
151	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
152	+	case 375: // lhaux
153	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
154	+	case 407: // sthx
155	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
156	+	case 439: // sthux
157	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
158	+	}
159	+	break;
160	+
161	+	case 32: // lwz
162	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
163	+	case 33: // lwzu
164	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
165	+	case 34: // lbz
166	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
167	+	case 35: // lbzu
168	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
169	+	case 36: // stw
170	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
171	+	case 37: // stwu
172	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
173	+	case 38: // stb
174	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
175	+	case 39: // stbu
176	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
177	+	case 40: // lhz
178	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
179	+	case 41: // lhzu
180	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
181	+	case 42: // lha
182	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
183	+	case 43: // lhau
184	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
185	+	case 44: // sth
186	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
187	+	case 45: // sthu
188	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; 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
#	Line 66 \| Line 233 \| static bool sigsegv_do_install_handler(i
233		#endif
234		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, siginfo_t sip, void scp
235		#define SIGSEGV_FAULT_ADDRESS sip->si_addr
236	+	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
237	+	#if (defined(i386) \|\| defined(__i386__))
238	+	#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext *)scp)->sc_eip)
239	+	#define SIGSEGV_REGISTER_FILE ((unsigned int )&(((struct sigcontext )scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
240	+	#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
241	+	#endif
242	+	#endif
243		#if defined(__linux__)
244		#if (defined(i386) \|\| defined(__i386__))
245		#include <sys/ucontext.h>
246	<	#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t )scp)->uc_mcontext.gregs[14]) / should use REG_EIP instead */
247	<	#define SIGSEGV_REGISTER_FILE (unsigned long )(((ucontext_t )scp)->uc_mcontext.gregs)
246	>	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
247	>	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
248	>	#define SIGSEGV_REGISTER_FILE (unsigned int *)SIGSEGV_CONTEXT_REGS
249		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
250		#endif
251	+	#if (defined(x86_64) \|\| defined(__x86_64__))
252	+	#include <sys/ucontext.h>
253	+	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
254	+	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
255	+	#define SIGSEGV_REGISTER_FILE (unsigned long *)SIGSEGV_CONTEXT_REGS
256	+	#endif
257		#if (defined(ia64) \|\| defined(__ia64__))
258		#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext )scp)->sc_ip & ~0x3ULL) / slot number is in bits 0 and 1 */
259		#endif
260		#if (defined(powerpc) \|\| defined(__powerpc__))
261		#include <sys/ucontext.h>
262	<	#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t *)scp)->uc_mcontext.regs->nip)
262	>	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.regs)
263	>	#define SIGSEGV_FAULT_INSTRUCTION (SIGSEGV_CONTEXT_REGS->nip)
264	>	#define SIGSEGV_REGISTER_FILE (unsigned int )&SIGSEGV_CONTEXT_REGS->nip, (unsigned int )(SIGSEGV_CONTEXT_REGS->gpr)
265	>	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
266		#endif
267		#endif
268		#endif
#	Line 92 \| Line 276 \| static bool sigsegv_do_install_handler(i
276		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext scs
277		#define SIGSEGV_FAULT_ADDRESS scs.cr2
278		#define SIGSEGV_FAULT_INSTRUCTION scs.eip
279	<	#define SIGSEGV_REGISTER_FILE (unsigned long *)(&scs)
279	>	#define SIGSEGV_REGISTER_FILE (unsigned int *)(&scs)
280		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
281		#endif
282		#if (defined(sparc) \|\| defined(__sparc__))
#	Line 105 \| Line 289 \| static bool sigsegv_do_install_handler(i
289		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp
290		#define SIGSEGV_FAULT_ADDRESS scp->regs->dar
291		#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip
292	+	#define SIGSEGV_REGISTER_FILE (unsigned int )&scp->regs->nip, (unsigned int )(scp->regs->gpr)
293	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
294		#endif
295		#if (defined(alpha) \|\| defined(__alpha__))
296		#include <asm/sigcontext.h>
#	Line 158 \| Line 344 \| static sigsegv_address_t get_fault_addre
344		#if (defined(m68k) \|\| defined(__m68k__))
345		#include <m68k/frame.h>
346		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
347	<	#define SIGSEGV_FAULT_ADDRESS ({ \
162	<	struct sigstate { \
163	<	int ss_flags; \
164	<	struct frame ss_frame; \
165	<	}; \
166	<	struct sigstate state = (struct sigstate )scp->sc_ap; \
167	<	char *fault_addr; \
168	<	switch (state->ss_frame.f_format) { \
169	<	case 7: /* 68040 access error */ \
170	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */ \
171	<	fault_addr = state->ss_frame.f_fmt7.f_fa; \
172	<	break; \
173	<	default: \
174	<	fault_addr = (char *)code; \
175	<	break; \
176	<	} \
177	<	fault_addr; \
178	<	})
347	>	#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
348		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
349	+
350	+	// Use decoding scheme from BasiliskII/m68k native
351	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
352	+	{
353	+	struct sigstate {
354	+	int ss_flags;
355	+	struct frame ss_frame;
356	+	};
357	+	struct sigstate state = (struct sigstate )scp->sc_ap;
358	+	char *fault_addr;
359	+	switch (state->ss_frame.f_format) {
360	+	case 7: /* 68040 access error */
361	+	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
362	+	fault_addr = state->ss_frame.f_fmt7.f_fa;
363	+	break;
364	+	default:
365	+	fault_addr = (char *)code;
366	+	break;
367	+	}
368	+	return (sigsegv_address_t)fault_addr;
369	+	}
370		#else
371		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, void scp, char addr
372		#define SIGSEGV_FAULT_ADDRESS addr
#	Line 191 \| Line 381 \| static sigsegv_address_t get_fault_addre
381		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
382		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir
383		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
384	+	#define SIGSEGV_REGISTER_FILE (unsigned int )&scp->sc_ir, &((unsigned int ) scp->sc_regs)[2]
385	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
386
387	<	// From Boehm's GC 6.0alpha8
196	<	#define EXTRACT_OP1(iw) (((iw) & 0xFC000000) >> 26)
197	<	#define EXTRACT_OP2(iw) (((iw) & 0x000007FE) >> 1)
198	<	#define EXTRACT_REGA(iw) (((iw) & 0x001F0000) >> 16)
199	<	#define EXTRACT_REGB(iw) (((iw) & 0x03E00000) >> 21)
200	<	#define EXTRACT_REGC(iw) (((iw) & 0x0000F800) >> 11)
201	<	#define EXTRACT_DISP(iw) ((short *) &(iw))[1]
202	<
387	>	// Use decoding scheme from SheepShaver
388		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
389		{
390	<	unsigned int instr = ((unsigned int ) scp->sc_ir);
391	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
392	<	int disp = 0, tmp;
393	<	unsigned int baseA = 0, baseB = 0;
394	<	unsigned int addr, alignmask = 0xFFFFFFFF;
395	<
211	<	switch(EXTRACT_OP1(instr)) {
212	<	case 38: /* stb */
213	<	case 39: /* stbu */
214	<	case 54: /* stfd */
215	<	case 55: /* stfdu */
216	<	case 52: /* stfs */
217	<	case 53: /* stfsu */
218	<	case 44: /* sth */
219	<	case 45: /* sthu */
220	<	case 47: /* stmw */
221	<	case 36: /* stw */
222	<	case 37: /* stwu */
223	<	tmp = EXTRACT_REGA(instr);
224	<	if(tmp > 0)
225	<	baseA = regs[tmp];
226	<	disp = EXTRACT_DISP(instr);
227	<	break;
228	<	case 31:
229	<	switch(EXTRACT_OP2(instr)) {
230	<	case 86: /* dcbf */
231	<	case 54: /* dcbst */
232	<	case 1014: /* dcbz */
233	<	case 247: /* stbux */
234	<	case 215: /* stbx */
235	<	case 759: /* stfdux */
236	<	case 727: /* stfdx */
237	<	case 983: /* stfiwx */
238	<	case 695: /* stfsux */
239	<	case 663: /* stfsx */
240	<	case 918: /* sthbrx */
241	<	case 439: /* sthux */
242	<	case 407: /* sthx */
243	<	case 661: /* stswx */
244	<	case 662: /* stwbrx */
245	<	case 150: /* stwcx. */
246	<	case 183: /* stwux */
247	<	case 151: /* stwx */
248	<	case 135: /* stvebx */
249	<	case 167: /* stvehx */
250	<	case 199: /* stvewx */
251	<	case 231: /* stvx */
252	<	case 487: /* stvxl */
253	<	tmp = EXTRACT_REGA(instr);
254	<	if(tmp > 0)
255	<	baseA = regs[tmp];
256	<	baseB = regs[EXTRACT_REGC(instr)];
257	<	/* determine Altivec alignment mask */
258	<	switch(EXTRACT_OP2(instr)) {
259	<	case 167: /* stvehx */
260	<	alignmask = 0xFFFFFFFE;
261	<	break;
262	<	case 199: /* stvewx */
263	<	alignmask = 0xFFFFFFFC;
264	<	break;
265	<	case 231: /* stvx */
266	<	alignmask = 0xFFFFFFF0;
267	<	break;
268	<	case 487: /* stvxl */
269	<	alignmask = 0xFFFFFFF0;
270	<	break;
271	<	}
272	<	break;
273	<	case 725: /* stswi */
274	<	tmp = EXTRACT_REGA(instr);
275	<	if(tmp > 0)
276	<	baseA = regs[tmp];
277	<	break;
278	<	default: /* ignore instruction */
279	<	return 0;
280	<	break;
281	<	}
282	<	break;
283	<	default: /* ignore instruction */
284	<	return 0;
285	<	break;
286	<	}
287	<
288	<	addr = (baseA + baseB) + disp;
289	<	addr &= alignmask;
290	<	return (sigsegv_address_t)addr;
390	>	unsigned int nip = (unsigned int) scp->sc_ir;
391	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
392	>	instruction_t instr;
393	>
394	>	powerpc_decode_instruction(&instr, nip, gpr);
395	>	return (sigsegv_address_t)instr.addr;
396		}
397		#endif
398		#endif
399		#endif
400
401	+
402	+	/*
403	+	* Instruction skipping
404	+	*/
405	+
406		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
407		// Decode and skip X86 instruction
408		#if (defined(i386) \|\| defined(__i386__))
#	Line 309 \| Line 419 \| enum {
419		X86_REG_EDI = 4
420		};
421		#endif
422	+	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
423	+	enum {
424	+	X86_REG_EIP = 10,
425	+	X86_REG_EAX = 7,
426	+	X86_REG_ECX = 6,
427	+	X86_REG_EDX = 5,
428	+	X86_REG_EBX = 4,
429	+	X86_REG_ESP = 13,
430	+	X86_REG_EBP = 2,
431	+	X86_REG_ESI = 1,
432	+	X86_REG_EDI = 0
433	+	};
434	+	#endif
435		// FIXME: this is partly redundant with the instruction decoding phase
436		// to discover transfer type and register number
437		static inline int ix86_step_over_modrm(unsigned char * p)
#	Line 343 \| Line 466 \| static inline int ix86_step_over_modrm(u
466		return offset;
467		}
468
469	<	static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs)
469	>	static bool ix86_skip_instruction(unsigned int * regs)
470		{
471	<	unsigned char * eip = (unsigned char *)fault_instruction;
471	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
472
473		if (eip == 0)
474		return false;
475
476	<	// Transfer type
477	<	enum {
355	<	TYPE_UNKNOWN,
356	<	TYPE_LOAD,
357	<	TYPE_STORE
358	<	} transfer_type = TYPE_UNKNOWN;
359	<
360	<	// Transfer size
361	<	enum {
362	<	SIZE_BYTE,
363	<	SIZE_WORD,
364	<	SIZE_LONG
365	<	} transfer_size = SIZE_LONG;
476	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
477	>	transfer_size_t transfer_size = SIZE_LONG;
478
479		int reg = -1;
480		int len = 0;
#	Line 376 \| Line 488 \| static bool ix86_skip_instruction(sigseg
488
489		// Decode instruction
490		switch (eip[0]) {
491	+	case 0x0f:
492	+	switch (eip[1]) {
493	+	case 0xb6: // MOVZX r32, r/m8
494	+	case 0xb7: // MOVZX r32, r/m16
495	+	switch (eip[2] & 0xc0) {
496	+	case 0x80:
497	+	reg = (eip[2] >> 3) & 7;
498	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
499	+	break;
500	+	case 0x40:
501	+	reg = (eip[2] >> 3) & 7;
502	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
503	+	break;
504	+	case 0x00:
505	+	reg = (eip[2] >> 3) & 7;
506	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
507	+	break;
508	+	}
509	+	len += 3 + ix86_step_over_modrm(eip + 2);
510	+	break;
511	+	}
512	+	break;
513		case 0x8a: // MOV r8, r/m8
514		transfer_size = SIZE_BYTE;
515		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
516		switch (eip[1] & 0xc0) {
517		case 0x80:
518		reg = (eip[1] >> 3) & 7;
519	<	transfer_type = TYPE_LOAD;
519	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
520		break;
521		case 0x40:
522		reg = (eip[1] >> 3) & 7;
523	<	transfer_type = TYPE_LOAD;
523	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
524		break;
525		case 0x00:
526		reg = (eip[1] >> 3) & 7;
527	<	transfer_type = TYPE_LOAD;
527	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
528		break;
529		}
530		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 401 \| Line 535 \| static bool ix86_skip_instruction(sigseg
535		switch (eip[1] & 0xc0) {
536		case 0x80:
537		reg = (eip[1] >> 3) & 7;
538	<	transfer_type = TYPE_STORE;
538	>	transfer_type = SIGSEGV_TRANSFER_STORE;
539		break;
540		case 0x40:
541		reg = (eip[1] >> 3) & 7;
542	<	transfer_type = TYPE_STORE;
542	>	transfer_type = SIGSEGV_TRANSFER_STORE;
543		break;
544		case 0x00:
545		reg = (eip[1] >> 3) & 7;
546	<	transfer_type = TYPE_STORE;
546	>	transfer_type = SIGSEGV_TRANSFER_STORE;
547		break;
548		}
549		len += 2 + ix86_step_over_modrm(eip + 1);
550		break;
551		}
552
553	<	if (transfer_type == TYPE_UNKNOWN) {
553	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
554		// Unknown machine code, let it crash. Then patch the decoder
555		return false;
556		}
557
558	<	if (transfer_type == TYPE_LOAD && reg != -1) {
558	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
559		static const int x86_reg_map[8] = {
560		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
561		X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
#	Line 447 \| Line 581 \| static bool ix86_skip_instruction(sigseg
581		#if DEBUG
582		printf("%08x: %s %s access", regs[X86_REG_EIP],
583		transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
584	<	transfer_type == TYPE_LOAD ? "read" : "write");
584	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
585
586		if (reg != -1) {
587		static const char * x86_reg_str_map[8] = {
588		"eax", "ecx", "edx", "ebx",
589		"esp", "ebp", "esi", "edi"
590		};
591	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
591	>	printf(" %s register %%%s", transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from", x86_reg_str_map[reg]);
592		}
593		printf(", %d bytes instruction\n", len);
594		#endif
#	Line 463 \| Line 597 \| static bool ix86_skip_instruction(sigseg
597		return true;
598		}
599		#endif
600	+
601	+	// Decode and skip PPC instruction
602	+	#if (defined(powerpc) \|\| defined(__powerpc__) \|\| defined(__ppc__))
603	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
604	+	{
605	+	instruction_t instr;
606	+	powerpc_decode_instruction(&instr, *nip_p, regs);
607	+
608	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
609	+	// Unknown machine code, let it crash. Then patch the decoder
610	+	return false;
611	+	}
612	+
613	+	ignore_range_list_t::iterator it = sigsegv_find_ignore_range((sigsegv_address_t)instr.addr);
614	+	if (it == sigsegv_ignore_ranges.end() \|\| ((it->transfer_type & instr.transfer_type) != instr.transfer_type)) {
615	+	// Address doesn't fall into ignore ranges list, let it crash.
616	+	return false;
617	+	}
618	+
619	+	#if DEBUG
620	+	printf("%08x: %s %s access", *nip_p,
621	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
622	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
623	+
624	+	if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
625	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
626	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
627	+	printf(" r%d (rd = 0)\n", instr.rd);
628	+	#endif
629	+
630	+	if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
631	+	regs[instr.ra] = instr.addr;
632	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
633	+	regs[instr.rd] = 0;
634	+
635	+	*nip_p += 4;
636	+	return true;
637	+	}
638	+	#endif
639		#endif
640
641		// Fallbacks
#	Line 488 \| Line 661 \| static void sigsegv_handler(SIGSEGV_FAUL
661		bool fault_recovered = false;
662
663		// Call user's handler and reinstall the global handler, if required
664	<	if (sigsegv_user_handler(fault_address, fault_instruction)) {
664	>	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
665		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
666		sigsegv_do_install_handler(sig);
667		#endif
668		fault_recovered = true;
669		}
670		#if HAVE_SIGSEGV_SKIP_INSTRUCTION
671	<	else if (sigsegv_ignore_fault) {
671	>	else if (sigsegv_ignore_ranges.size() > 0) {
672		// Call the instruction skipper with the register file available
673	<	if (SIGSEGV_SKIP_INSTRUCTION(fault_instruction, SIGSEGV_REGISTER_FILE))
673	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
674		fault_recovered = true;
675		}
676		#endif
#	Line 509 \| Line 682 \| static void sigsegv_handler(SIGSEGV_FAUL
682		#undef FAULT_HANDLER
683
684		// We can't do anything with the fault_address, dump state?
685	<	if (sigsegv_dump_state != 0)
686	<	sigsegv_dump_state(fault_address, fault_instruction);
685	>	if (sigsegv_state_dumper != 0)
686	>	sigsegv_state_dumper(fault_address, fault_instruction);
687		}
688		}
689		#endif
#	Line 525 \| Line 698 \| static bool sigsegv_do_install_handler(i
698		{
699		// Setup SIGSEGV handler to process writes to frame buffer
700		#ifdef HAVE_SIGACTION
701	<	struct sigaction vosf_sa;
702	<	sigemptyset(&vosf_sa.sa_mask);
703	<	vosf_sa.sa_sigaction = sigsegv_handler;
704	<	vosf_sa.sa_flags = SA_SIGINFO;
705	<	return (sigaction(sig, &vosf_sa, 0) == 0);
701	>	struct sigaction sigsegv_sa;
702	>	sigemptyset(&sigsegv_sa.sa_mask);
703	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
704	>	sigsegv_sa.sa_flags = SA_SIGINFO;
705	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
706		#else
707		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
708		#endif
#	Line 541 \| Line 714 \| static bool sigsegv_do_install_handler(i
714		{
715		// Setup SIGSEGV handler to process writes to frame buffer
716		#ifdef HAVE_SIGACTION
717	<	struct sigaction vosf_sa;
718	<	sigemptyset(&vosf_sa.sa_mask);
719	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
717	>	struct sigaction sigsegv_sa;
718	>	sigemptyset(&sigsegv_sa.sa_mask);
719	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
720	>	sigsegv_sa.sa_flags = 0;
721		#if !EMULATED_68K && defined(__NetBSD__)
722	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
723	<	vosf_sa.sa_flags = SA_ONSTACK;
550	<	#else
551	<	vosf_sa.sa_flags = 0;
722	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
723	>	sigsegv_sa.sa_flags \|= SA_ONSTACK;
724		#endif
725	<	return (sigaction(sig, &vosf_sa, 0) == 0);
725	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
726		#else
727		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
728		#endif
729		}
730		#endif
731
732	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
732	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
733		{
734		#ifdef HAVE_SIGSEGV_RECOVERY
735	<	sigsegv_user_handler = handler;
735	>	sigsegv_fault_handler = handler;
736		bool success = true;
737		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
738		SIGSEGV_ALL_SIGNALS
#	Line 580 \| Line 752 \| bool sigsegv_install_handler(sigsegv_han
752		void sigsegv_deinstall_handler(void)
753		{
754		#ifdef HAVE_SIGSEGV_RECOVERY
755	<	sigsegv_user_handler = 0;
755	>	sigsegv_fault_handler = 0;
756		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
757		SIGSEGV_ALL_SIGNALS
758		#undef FAULT_HANDLER
#	Line 589 \| Line 761 \| void sigsegv_deinstall_handler(void)
761
762
763		/*
764	<	* SIGSEGV ignore state modifier
764	>	* Add SIGSEGV ignore range
765		*/
766
767	<	void sigsegv_set_ignore_state(bool ignore_fault)
767	>	void sigsegv_add_ignore_range(sigsegv_address_t address, unsigned long length, int transfer_type)
768		{
769	<	sigsegv_ignore_fault = ignore_fault;
769	>	ignore_range_t ignore_range;
770	>	ignore_range.start = address;
771	>	ignore_range.length = length;
772	>	ignore_range.transfer_type = transfer_type;
773	>	sigsegv_ignore_ranges.push_front(ignore_range);
774	>	}
775	>
776	>
777	>	/*
778	>	* Remove SIGSEGV ignore range. Range must match installed one, otherwise FALSE is returned.
779	>	*/
780	>
781	>	bool sigsegv_remove_ignore_range(sigsegv_address_t address, unsigned long length, int transfer_type)
782	>	{
783	>	ignore_range_list_t::iterator it;
784	>	for (it = sigsegv_ignore_ranges.begin(); it != sigsegv_ignore_ranges.end(); it++)
785	>	if (it->start == address && it->length == length && ((it->transfer_type & transfer_type) == transfer_type))
786	>	break;
787	>
788	>	if (it != sigsegv_ignore_ranges.end()) {
789	>	if (it->transfer_type != transfer_type)
790	>	it->transfer_type &= ~transfer_type;
791	>	else
792	>	sigsegv_ignore_ranges.erase(it);
793	>	return true;
794	>	}
795	>
796	>	return false;
797		}
798
799
#	Line 602 \| Line 801 \| void sigsegv_set_ignore_state(bool ignor
801		* Set callback function when we cannot handle the fault
802		*/
803
804	<	void sigsegv_set_dump_state(sigsegv_handler_t handler)
804	>	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
805		{
806	<	sigsegv_dump_state = handler;
806	>	sigsegv_state_dumper = handler;
807		}
808
809
#	Line 665 \| Line 864 \| int main(void)
864		if (!sigsegv_install_handler(sigsegv_insn_handler))
865		return 1;
866
867	<	if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0)
867	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ \| VM_PAGE_WRITE) < 0)
868		return 1;
869
870		for (int i = 0; i < page_size; i++)
#	Line 674 \| Line 873 \| int main(void)
873		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
874		return 1;
875
876	<	sigsegv_set_ignore_state(true);
876	>	sigsegv_add_ignore_range((char *)page, page_size, SIGSEGV_TRANSFER_LOAD \| SIGSEGV_TRANSFER_STORE);
877
878		#define TEST_SKIP_INSTRUCTION(TYPE) do { \
879		const unsigned int TAG = 0x12345678; \

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Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents): Revision 1.11 by gbeauche, 2002-05-12T13:51:22Z vs. Revision 1.23 by gbeauche, 2003-08-17T10:52:52Z

Diff Legend

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.11 by gbeauche, 2002-05-12T13:51:22Z vs.
Revision 1.23 by gbeauche, 2003-08-17T10:52:52Z