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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.12 by gbeauche, 2002-05-16T15:48:06Z vs.
Revision 1.31 by gbeauche, 2003-10-13T20:15:41Z

#	Line 4 \| Line 4
4		* Derived from Bruno Haible's work on his SIGSEGV library for clisp
5		* <http://clisp.sourceforge.net/>
6		*
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) 1997-2002 Christian Bauer
14		*
15		* This program is free software; you can redistribute it and/or modify
#	Line 29 \| Line 35
35		#include "config.h"
36		#endif
37
38	+	#include <list>
39		#include <signal.h>
40		#include "sigsegv.h"
41
42	+	#ifndef NO_STD_NAMESPACE
43	+	using std::list;
44	+	#endif
45	+
46		// Return value type of a signal handler (standard type if not defined)
47		#ifndef RETSIGTYPE
48		#define RETSIGTYPE void
#	Line 40 \| Line 51
51		// Type of the system signal handler
52		typedef RETSIGTYPE (*signal_handler)(int);
53
43	–	// Is the fault to be ignored?
44	–	static bool sigsegv_ignore_fault = false;
45	–
54		// User's SIGSEGV handler
55		static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
56
#	Line 54 \| Line 62 \| static bool sigsegv_do_install_handler(i
62
63
64		/*
65	+	* Instruction decoding aids
66	+	*/
67	+
68	+	// Transfer size
69	+	enum transfer_size_t {
70	+	SIZE_UNKNOWN,
71	+	SIZE_BYTE,
72	+	SIZE_WORD,
73	+	SIZE_LONG
74	+	};
75	+
76	+	// Transfer type
77	+	typedef sigsegv_transfer_type_t transfer_type_t;
78	+
79	+	#if (defined(powerpc) \|\| defined(__powerpc__) \|\| defined(__ppc__))
80	+	// Addressing mode
81	+	enum addressing_mode_t {
82	+	MODE_UNKNOWN,
83	+	MODE_NORM,
84	+	MODE_U,
85	+	MODE_X,
86	+	MODE_UX
87	+	};
88	+
89	+	// Decoded instruction
90	+	struct instruction_t {
91	+	transfer_type_t transfer_type;
92	+	transfer_size_t transfer_size;
93	+	addressing_mode_t addr_mode;
94	+	unsigned int addr;
95	+	char ra, rd;
96	+	};
97	+
98	+	static void powerpc_decode_instruction(instruction_t instruction, unsigned int nip, unsigned int gpr)
99	+	{
100	+	// Get opcode and divide into fields
101	+	unsigned int opcode = ((unsigned int )nip);
102	+	unsigned int primop = opcode >> 26;
103	+	unsigned int exop = (opcode >> 1) & 0x3ff;
104	+	unsigned int ra = (opcode >> 16) & 0x1f;
105	+	unsigned int rb = (opcode >> 11) & 0x1f;
106	+	unsigned int rd = (opcode >> 21) & 0x1f;
107	+	signed int imm = (signed short)(opcode & 0xffff);
108	+
109	+	// Analyze opcode
110	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
111	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
112	+	addressing_mode_t addr_mode = MODE_UNKNOWN;
113	+	switch (primop) {
114	+	case 31:
115	+	switch (exop) {
116	+	case 23: // lwzx
117	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
118	+	case 55: // lwzux
119	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
120	+	case 87: // lbzx
121	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
122	+	case 119: // lbzux
123	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
124	+	case 151: // stwx
125	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
126	+	case 183: // stwux
127	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
128	+	case 215: // stbx
129	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
130	+	case 247: // stbux
131	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
132	+	case 279: // lhzx
133	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
134	+	case 311: // lhzux
135	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
136	+	case 343: // lhax
137	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
138	+	case 375: // lhaux
139	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
140	+	case 407: // sthx
141	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
142	+	case 439: // sthux
143	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
144	+	}
145	+	break;
146	+
147	+	case 32: // lwz
148	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
149	+	case 33: // lwzu
150	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
151	+	case 34: // lbz
152	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
153	+	case 35: // lbzu
154	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
155	+	case 36: // stw
156	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
157	+	case 37: // stwu
158	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
159	+	case 38: // stb
160	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
161	+	case 39: // stbu
162	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
163	+	case 40: // lhz
164	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
165	+	case 41: // lhzu
166	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
167	+	case 42: // lha
168	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
169	+	case 43: // lhau
170	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
171	+	case 44: // sth
172	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
173	+	case 45: // sthu
174	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
175	+	}
176	+
177	+	// Calculate effective address
178	+	unsigned int addr = 0;
179	+	switch (addr_mode) {
180	+	case MODE_X:
181	+	case MODE_UX:
182	+	if (ra == 0)
183	+	addr = gpr[rb];
184	+	else
185	+	addr = gpr[ra] + gpr[rb];
186	+	break;
187	+	case MODE_NORM:
188	+	case MODE_U:
189	+	if (ra == 0)
190	+	addr = (signed int)(signed short)imm;
191	+	else
192	+	addr = gpr[ra] + (signed int)(signed short)imm;
193	+	break;
194	+	default:
195	+	break;
196	+	}
197	+
198	+	// Commit decoded instruction
199	+	instruction->addr = addr;
200	+	instruction->addr_mode = addr_mode;
201	+	instruction->transfer_type = transfer_type;
202	+	instruction->transfer_size = transfer_size;
203	+	instruction->ra = ra;
204	+	instruction->rd = rd;
205	+	}
206	+	#endif
207	+
208	+
209	+	/*
210		* OS-dependant SIGSEGV signals support section
211		*/
212
#	Line 65 \| Line 218 \| static bool sigsegv_do_install_handler(i
218		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
219		#endif
220		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, siginfo_t sip, void scp
221	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t sip, void scp
222	+	#define SIGSEGV_FAULT_HANDLER_ARGS sip, scp
223		#define SIGSEGV_FAULT_ADDRESS sip->si_addr
224	+	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
225	+	#if (defined(i386) \|\| defined(__i386__))
226	+	#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext *)scp)->sc_eip)
227	+	#define SIGSEGV_REGISTER_FILE ((unsigned int )&(((struct sigcontext )scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
228	+	#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
229	+	#endif
230	+	#endif
231		#if defined(__linux__)
232		#if (defined(i386) \|\| defined(__i386__))
233		#include <sys/ucontext.h>
234	<	#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t )scp)->uc_mcontext.gregs[14]) / should use REG_EIP instead */
235	<	#define SIGSEGV_REGISTER_FILE (unsigned long )(((ucontext_t )scp)->uc_mcontext.gregs)
234	>	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
235	>	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
236	>	#define SIGSEGV_REGISTER_FILE (unsigned int *)SIGSEGV_CONTEXT_REGS
237		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
238		#endif
239	+	#if (defined(x86_64) \|\| defined(__x86_64__))
240	+	#include <sys/ucontext.h>
241	+	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
242	+	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
243	+	#define SIGSEGV_REGISTER_FILE (unsigned long *)SIGSEGV_CONTEXT_REGS
244	+	#endif
245		#if (defined(ia64) \|\| defined(__ia64__))
246		#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext )scp)->sc_ip & ~0x3ULL) / slot number is in bits 0 and 1 */
247		#endif
248		#if (defined(powerpc) \|\| defined(__powerpc__))
249		#include <sys/ucontext.h>
250	<	#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t *)scp)->uc_mcontext.regs->nip)
250	>	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.regs)
251	>	#define SIGSEGV_FAULT_INSTRUCTION (SIGSEGV_CONTEXT_REGS->nip)
252	>	#define SIGSEGV_REGISTER_FILE (unsigned int )&SIGSEGV_CONTEXT_REGS->nip, (unsigned int )(SIGSEGV_CONTEXT_REGS->gpr)
253	>	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
254		#endif
255		#endif
256		#endif
#	Line 90 \| Line 262 \| static bool sigsegv_do_install_handler(i
262		#if (defined(i386) \|\| defined(__i386__))
263		#include <asm/sigcontext.h>
264		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext scs
265	<	#define SIGSEGV_FAULT_ADDRESS scs.cr2
266	<	#define SIGSEGV_FAULT_INSTRUCTION scs.eip
267	<	#define SIGSEGV_REGISTER_FILE (unsigned long *)(&scs)
265	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
266	>	#define SIGSEGV_FAULT_HANDLER_ARGS &scs
267	>	#define SIGSEGV_FAULT_ADDRESS scp->cr2
268	>	#define SIGSEGV_FAULT_INSTRUCTION scp->eip
269	>	#define SIGSEGV_REGISTER_FILE (unsigned int *)scp
270		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
271		#endif
272		#if (defined(sparc) \|\| defined(__sparc__))
273		#include <asm/sigcontext.h>
274		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext scp, char addr
275	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr
276		#define SIGSEGV_FAULT_ADDRESS addr
277		#endif
278		#if (defined(powerpc) \|\| defined(__powerpc__))
279		#include <asm/sigcontext.h>
280		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp
281	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, scp
282		#define SIGSEGV_FAULT_ADDRESS scp->regs->dar
283		#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip
284	+	#define SIGSEGV_REGISTER_FILE (unsigned int )&scp->regs->nip, (unsigned int )(scp->regs->gpr)
285	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
286		#endif
287		#if (defined(alpha) \|\| defined(__alpha__))
288		#include <asm/sigcontext.h>
289		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
290	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
291		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
292		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_pc
293
#	Line 127 \| Line 306 \| static sigsegv_address_t get_fault_addre
306		#if (defined(sgi) \|\| defined(__sgi)) && (defined(SYSTYPE_SVR4) \|\| defined(__SYSTYPE_SVR4))
307		#include <ucontext.h>
308		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
309	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
310		#define SIGSEGV_FAULT_ADDRESS scp->sc_badvaddr
311		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
312		#endif
#	Line 134 \| Line 314 \| static sigsegv_address_t get_fault_addre
314		// HP-UX
315		#if (defined(hpux) \|\| defined(__hpux__))
316		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
317	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
318		#define SIGSEGV_FAULT_ADDRESS scp->sc_sl.sl_ss.ss_narrow.ss_cr21
319		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
320		#endif
#	Line 142 \| Line 323 \| static sigsegv_address_t get_fault_addre
323		#if defined(__osf__)
324		#include <ucontext.h>
325		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
326	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
327		#define SIGSEGV_FAULT_ADDRESS scp->sc_traparg_a0
328		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
329		#endif
#	Line 149 \| Line 331 \| static sigsegv_address_t get_fault_addre
331		// AIX
332		#if defined(_AIX)
333		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
334	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
335		#define SIGSEGV_FAULT_ADDRESS scp->sc_jmpbuf.jmp_context.o_vaddr
336		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
337		#endif
#	Line 158 \| Line 341 \| static sigsegv_address_t get_fault_addre
341		#if (defined(m68k) \|\| defined(__m68k__))
342		#include <m68k/frame.h>
343		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
344	<	#define SIGSEGV_FAULT_ADDRESS ({ \
345	<	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	<	})
344	>	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
345	>	#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
346		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
347	+
348	+	// Use decoding scheme from BasiliskII/m68k native
349	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
350	+	{
351	+	struct sigstate {
352	+	int ss_flags;
353	+	struct frame ss_frame;
354	+	};
355	+	struct sigstate state = (struct sigstate )scp->sc_ap;
356	+	char *fault_addr;
357	+	switch (state->ss_frame.f_format) {
358	+	case 7: /* 68040 access error */
359	+	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
360	+	fault_addr = state->ss_frame.f_fmt7.f_fa;
361	+	break;
362	+	default:
363	+	fault_addr = (char *)code;
364	+	break;
365	+	}
366	+	return (sigsegv_address_t)fault_addr;
367	+	}
368		#else
369		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, void scp, char addr
370	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr
371		#define SIGSEGV_FAULT_ADDRESS addr
372		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
373		#endif
374		#endif
375
376	<	// MacOS X
376	>	// MacOS X, not sure which version this works in. Under 10.1
377	>	// vm_protect does not appear to work from a signal handler. Under
378	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
379	>	// field is the address of the faulting instruction and not the
380	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
381	>	// case with Mach exception handlers there is a way to do what this
382	>	// was meant to do.
383	>	#ifndef HAVE_MACH_EXCEPTIONS
384		#if defined(__APPLE__) && defined(__MACH__)
385		#if (defined(ppc) \|\| defined(__ppc__))
386		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
387	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
388		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
389		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir
390		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
391	+	#define SIGSEGV_REGISTER_FILE (unsigned int )&scp->sc_ir, &((unsigned int ) scp->sc_regs)[2]
392	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
393
394	<	// 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	<
394	>	// Use decoding scheme from SheepShaver
395		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
396		{
397	<	unsigned int instr = ((unsigned int ) scp->sc_ir);
398	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
399	<	int disp = 0, tmp;
400	<	unsigned int baseA = 0, baseB = 0;
401	<	unsigned int addr, alignmask = 0xFFFFFFFF;
402	<
403	<	switch(EXTRACT_OP1(instr)) {
404	<	case 38: /* stb */
405	<	case 39: /* stbu */
406	<	case 54: /* stfd */
407	<	case 55: /* stfdu */
408	<	case 52: /* stfs */
409	<	case 53: /* stfsu */
410	<	case 44: /* sth */
411	<	case 45: /* sthu */
412	<	case 47: /* stmw */
413	<	case 36: /* stw */
414	<	case 37: /* stwu */
415	<	tmp = EXTRACT_REGA(instr);
416	<	if(tmp > 0)
417	<	baseA = regs[tmp];
418	<	disp = EXTRACT_DISP(instr);
419	<	break;
420	<	case 31:
421	<	switch(EXTRACT_OP2(instr)) {
422	<	case 86: /* dcbf */
423	<	case 54: /* dcbst */
424	<	case 1014: /* dcbz */
425	<	case 247: /* stbux */
426	<	case 215: /* stbx */
427	<	case 759: /* stfdux */
428	<	case 727: /* stfdx */
429	<	case 983: /* stfiwx */
430	<	case 695: /* stfsux */
431	<	case 663: /* stfsx */
432	<	case 918: /* sthbrx */
433	<	case 439: /* sthux */
434	<	case 407: /* sthx */
435	<	case 661: /* stswx */
436	<	case 662: /* stwbrx */
437	<	case 150: /* stwcx. */
438	<	case 183: /* stwux */
439	<	case 151: /* stwx */
440	<	case 135: /* stvebx */
441	<	case 167: /* stvehx */
442	<	case 199: /* stvewx */
443	<	case 231: /* stvx */
444	<	case 487: /* stvxl */
445	<	tmp = EXTRACT_REGA(instr);
446	<	if(tmp > 0)
447	<	baseA = regs[tmp];
448	<	baseB = regs[EXTRACT_REGC(instr)];
449	<	/* determine Altivec alignment mask */
450	<	switch(EXTRACT_OP2(instr)) {
451	<	case 167: /* stvehx */
452	<	alignmask = 0xFFFFFFFE;
453	<	break;
454	<	case 199: /* stvewx */
455	<	alignmask = 0xFFFFFFFC;
456	<	break;
457	<	case 231: /* stvx */
458	<	alignmask = 0xFFFFFFF0;
459	<	break;
460	<	case 487: /* stvxl */
461	<	alignmask = 0xFFFFFFF0;
462	<	break;
463	<	}
464	<	break;
465	<	case 725: /* stswi */
466	<	tmp = EXTRACT_REGA(instr);
467	<	if(tmp > 0)
468	<	baseA = regs[tmp];
469	<	break;
470	<	default: /* ignore instruction */
471	<	return 0;
472	<	break;
397	>	unsigned int nip = (unsigned int) scp->sc_ir;
398	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
399	>	instruction_t instr;
400	>
401	>	powerpc_decode_instruction(&instr, nip, gpr);
402	>	return (sigsegv_address_t)instr.addr;
403	>	}
404	>	#endif
405	>	#endif
406	>	#endif
407	>	#endif
408	>
409	>	#if HAVE_MACH_EXCEPTIONS
410	>
411	>	// This can easily be extended to other Mach systems, but really who
412	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
413	>	// Mach 2.5/3.0?
414	>	#if defined(__APPLE__) && defined(__MACH__)
415	>
416	>	#include <sys/types.h>
417	>	#include <stdlib.h>
418	>	#include <stdio.h>
419	>	#include <pthread.h>
420	>
421	>	/*
422	>	* If you are familiar with MIG then you will understand the frustration
423	>	* that was necessary to get these embedded into C++ code by hand.
424	>	*/
425	>	extern "C" {
426	>	#include <mach/mach.h>
427	>	#include <mach/mach_error.h>
428	>
429	>	extern boolean_t exc_server(mach_msg_header_t , mach_msg_header_t );
430	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
431	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
432	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
433	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
434	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
435	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
436	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
437	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
438	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
439	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
440	>	}
441	>
442	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
443	>	#define HANDLER_COUNT 64
444	>
445	>	// structure to tuck away existing exception handlers
446	>	typedef struct _ExceptionPorts {
447	>	mach_msg_type_number_t maskCount;
448	>	exception_mask_t masks[HANDLER_COUNT];
449	>	exception_handler_t handlers[HANDLER_COUNT];
450	>	exception_behavior_t behaviors[HANDLER_COUNT];
451	>	thread_state_flavor_t flavors[HANDLER_COUNT];
452	>	} ExceptionPorts;
453	>
454	>	// exception handler thread
455	>	static pthread_t exc_thread;
456	>
457	>	// place where old exception handler info is stored
458	>	static ExceptionPorts ports;
459	>
460	>	// our exception port
461	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
462	>
463	>	#define MACH_CHECK_ERROR(name,ret) \
464	>	if (ret != KERN_SUCCESS) { \
465	>	mach_error(#name, ret); \
466	>	exit (1); \
467	>	}
468	>
469	>	#define SIGSEGV_FAULT_ADDRESS code[1]
470	>	#define SIGSEGV_FAULT_INSTRUCTION get_fault_instruction(thread, state)
471	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP) ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
472	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
473	>	#define SIGSEGV_FAULT_HANDLER_ARGS thread, code, &state
474	>	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
475	>	#define SIGSEGV_REGISTER_FILE &state->srr0, &state->r0
476	>
477	>	// Given a suspended thread, stuff the current instruction and
478	>	// registers into state.
479	>	//
480	>	// It would have been nice to have this be ppc/x86 independant which
481	>	// could have been done easily with a thread_state_t instead of
482	>	// ppc_thread_state_t, but because of the way this is called it is
483	>	// easier to do it this way.
484	>	#if (defined(ppc) \|\| defined(__ppc__))
485	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
486	>	{
487	>	kern_return_t krc;
488	>	mach_msg_type_number_t count;
489	>
490	>	count = MACHINE_THREAD_STATE_COUNT;
491	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
492	>	MACH_CHECK_ERROR (thread_get_state, krc);
493	>
494	>	return (sigsegv_address_t)state->srr0;
495	>	}
496	>	#endif
497	>
498	>	// Since there can only be one exception thread running at any time
499	>	// this is not a problem.
500	>	#define MSG_SIZE 512
501	>	static char msgbuf[MSG_SIZE];
502	>	static char replybuf[MSG_SIZE];
503	>
504	>	/*
505	>	* This is the entry point for the exception handler thread. The job
506	>	* of this thread is to wait for exception messages on the exception
507	>	* port that was setup beforehand and to pass them on to exc_server.
508	>	* exc_server is a MIG generated function that is a part of Mach.
509	>	* Its job is to decide what to do with the exception message. In our
510	>	* case exc_server calls catch_exception_raise on our behalf. After
511	>	* exc_server returns, it is our responsibility to send the reply.
512	>	*/
513	>	static void *
514	>	handleExceptions(void *priv)
515	>	{
516	>	mach_msg_header_t msg, reply;
517	>	kern_return_t krc;
518	>
519	>	msg = (mach_msg_header_t *)msgbuf;
520	>	reply = (mach_msg_header_t *)replybuf;
521	>
522	>	for (;;) {
523	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
524	>	_exceptionPort, 0, MACH_PORT_NULL);
525	>	MACH_CHECK_ERROR(mach_msg, krc);
526	>
527	>	if (!exc_server(msg, reply)) {
528	>	fprintf(stderr, "exc_server hated the message\n");
529	>	exit(1);
530	>	}
531	>
532	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
533	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
534	>	if (krc != KERN_SUCCESS) {
535	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
536	>	krc, mach_error_string(krc));
537	>	exit(1);
538		}
282	–	break;
283	–	default: /* ignore instruction */
284	–	return 0;
285	–	break;
539		}
287	–
288	–	addr = (baseA + baseB) + disp;
289	–	addr &= alignmask;
290	–	return (sigsegv_address_t)addr;
540		}
541		#endif
542		#endif
543	<	#endif
543	>
544	>
545	>	/*
546	>	* Instruction skipping
547	>	*/
548
549		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
550		// Decode and skip X86 instruction
#	Line 309 \| Line 562 \| enum {
562		X86_REG_EDI = 4
563		};
564		#endif
565	+	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
566	+	enum {
567	+	X86_REG_EIP = 10,
568	+	X86_REG_EAX = 7,
569	+	X86_REG_ECX = 6,
570	+	X86_REG_EDX = 5,
571	+	X86_REG_EBX = 4,
572	+	X86_REG_ESP = 13,
573	+	X86_REG_EBP = 2,
574	+	X86_REG_ESI = 1,
575	+	X86_REG_EDI = 0
576	+	};
577	+	#endif
578		// FIXME: this is partly redundant with the instruction decoding phase
579		// to discover transfer type and register number
580		static inline int ix86_step_over_modrm(unsigned char * p)
#	Line 343 \| Line 609 \| static inline int ix86_step_over_modrm(u
609		return offset;
610		}
611
612	<	static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs)
612	>	static bool ix86_skip_instruction(unsigned int * regs)
613		{
614	<	unsigned char * eip = (unsigned char *)fault_instruction;
614	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
615
616		if (eip == 0)
617		return false;
618
619	<	// Transfer type
620	<	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;
619	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
620	>	transfer_size_t transfer_size = SIZE_LONG;
621
622		int reg = -1;
623		int len = 0;
#	Line 376 \| Line 631 \| static bool ix86_skip_instruction(sigseg
631
632		// Decode instruction
633		switch (eip[0]) {
634	+	case 0x0f:
635	+	switch (eip[1]) {
636	+	case 0xb6: // MOVZX r32, r/m8
637	+	case 0xb7: // MOVZX r32, r/m16
638	+	switch (eip[2] & 0xc0) {
639	+	case 0x80:
640	+	reg = (eip[2] >> 3) & 7;
641	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
642	+	break;
643	+	case 0x40:
644	+	reg = (eip[2] >> 3) & 7;
645	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
646	+	break;
647	+	case 0x00:
648	+	reg = (eip[2] >> 3) & 7;
649	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
650	+	break;
651	+	}
652	+	len += 3 + ix86_step_over_modrm(eip + 2);
653	+	break;
654	+	}
655	+	break;
656		case 0x8a: // MOV r8, r/m8
657		transfer_size = SIZE_BYTE;
658		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
659		switch (eip[1] & 0xc0) {
660		case 0x80:
661		reg = (eip[1] >> 3) & 7;
662	<	transfer_type = TYPE_LOAD;
662	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
663		break;
664		case 0x40:
665		reg = (eip[1] >> 3) & 7;
666	<	transfer_type = TYPE_LOAD;
666	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
667		break;
668		case 0x00:
669		reg = (eip[1] >> 3) & 7;
670	<	transfer_type = TYPE_LOAD;
670	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
671		break;
672		}
673		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 401 \| Line 678 \| static bool ix86_skip_instruction(sigseg
678		switch (eip[1] & 0xc0) {
679		case 0x80:
680		reg = (eip[1] >> 3) & 7;
681	<	transfer_type = TYPE_STORE;
681	>	transfer_type = SIGSEGV_TRANSFER_STORE;
682		break;
683		case 0x40:
684		reg = (eip[1] >> 3) & 7;
685	<	transfer_type = TYPE_STORE;
685	>	transfer_type = SIGSEGV_TRANSFER_STORE;
686		break;
687		case 0x00:
688		reg = (eip[1] >> 3) & 7;
689	<	transfer_type = TYPE_STORE;
689	>	transfer_type = SIGSEGV_TRANSFER_STORE;
690		break;
691		}
692		len += 2 + ix86_step_over_modrm(eip + 1);
693		break;
694		}
695
696	<	if (transfer_type == TYPE_UNKNOWN) {
696	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
697		// Unknown machine code, let it crash. Then patch the decoder
698		return false;
699		}
700
701	<	if (transfer_type == TYPE_LOAD && reg != -1) {
701	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
702		static const int x86_reg_map[8] = {
703		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
704		X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
#	Line 447 \| Line 724 \| static bool ix86_skip_instruction(sigseg
724		#if DEBUG
725		printf("%08x: %s %s access", regs[X86_REG_EIP],
726		transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
727	<	transfer_type == TYPE_LOAD ? "read" : "write");
727	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
728
729		if (reg != -1) {
730		static const char * x86_reg_str_map[8] = {
731		"eax", "ecx", "edx", "ebx",
732		"esp", "ebp", "esi", "edi"
733		};
734	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
734	>	printf(" %s register %%%s", transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from", x86_reg_str_map[reg]);
735		}
736		printf(", %d bytes instruction\n", len);
737		#endif
#	Line 463 \| Line 740 \| static bool ix86_skip_instruction(sigseg
740		return true;
741		}
742		#endif
743	+
744	+	// Decode and skip PPC instruction
745	+	#if (defined(powerpc) \|\| defined(__powerpc__) \|\| defined(__ppc__))
746	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
747	+	{
748	+	instruction_t instr;
749	+	powerpc_decode_instruction(&instr, *nip_p, regs);
750	+
751	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
752	+	// Unknown machine code, let it crash. Then patch the decoder
753	+	return false;
754	+	}
755	+
756	+	#if DEBUG
757	+	printf("%08x: %s %s access", *nip_p,
758	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
759	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
760	+
761	+	if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
762	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
763	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
764	+	printf(" r%d (rd = 0)\n", instr.rd);
765	+	#endif
766	+
767	+	if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
768	+	regs[instr.ra] = instr.addr;
769	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
770	+	regs[instr.rd] = 0;
771	+
772	+	*nip_p += 4;
773	+	return true;
774	+	}
775	+	#endif
776		#endif
777
778		// Fallbacks
779		#ifndef SIGSEGV_FAULT_INSTRUCTION
780		#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_INVALID_PC
781		#endif
782	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
783	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
784	+	#endif
785	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
786	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP) sigsegv_fault_handler(ADDR, IP)
787	+	#endif
788
789		// SIGSEGV recovery supported ?
790		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 480 \| Line 796 \| static bool ix86_skip_instruction(sigseg
796		* SIGSEGV global handler
797		*/
798
799	<	#ifdef HAVE_SIGSEGV_RECOVERY
800	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
799	>	#if defined(HAVE_SIGSEGV_RECOVERY) \|\| defined(HAVE_MACH_EXCEPTIONS)
800	>	// This function handles the badaccess to memory.
801	>	// It is called from the signal handler or the exception handler.
802	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
803		{
804		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
805		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
488	–	bool fault_recovered = false;
806
807		// Call user's handler and reinstall the global handler, if required
808	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
809	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
810	<	sigsegv_do_install_handler(sig);
808	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
809	>	case SIGSEGV_RETURN_SUCCESS:
810	>	return true;
811	>
812	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
813	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
814	>	// Call the instruction skipper with the register file
815	>	// available
816	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
817	>	#ifdef HAVE_MACH_EXCEPTIONS
818	>	// Unlike UNIX signals where the thread state
819	>	// is modified off of the stack, in Mach we
820	>	// need to actually call thread_set_state to
821	>	// have the register values updated.
822	>	kern_return_t krc;
823	>
824	>	krc = thread_set_state(thread,
825	>	MACHINE_THREAD_STATE, (thread_state_t)state,
826	>	MACHINE_THREAD_STATE_COUNT);
827	>	MACH_CHECK_ERROR (thread_get_state, krc);
828	>	#endif
829	>	return true;
830	>	}
831	>	break;
832		#endif
495	–	fault_recovered = true;
833		}
834	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
835	<	else if (sigsegv_ignore_fault) {
836	<	// Call the instruction skipper with the register file available
837	<	if (SIGSEGV_SKIP_INSTRUCTION(fault_instruction, SIGSEGV_REGISTER_FILE))
838	<	fault_recovered = true;
834	>
835	>	// We can't do anything with the fault_address, dump state?
836	>	if (sigsegv_state_dumper != 0)
837	>	sigsegv_state_dumper(fault_address, fault_instruction);
838	>
839	>	return false;
840	>	}
841	>	#endif
842	>
843	>
844	>	/*
845	>	* There are two mechanisms for handling a bad memory access,
846	>	* Mach exceptions and UNIX signals. The implementation specific
847	>	* code appears below. Its reponsibility is to call handle_badaccess
848	>	* which is the routine that handles the fault in an implementation
849	>	* agnostic manner. The implementation specific code below is then
850	>	* reponsible for checking whether handle_badaccess was able
851	>	* to handle the memory access error and perform any implementation
852	>	* specific tasks necessary afterwards.
853	>	*/
854	>
855	>	#ifdef HAVE_MACH_EXCEPTIONS
856	>	/*
857	>	* We need to forward all exceptions that we do not handle.
858	>	* This is important, there are many exceptions that may be
859	>	* handled by other exception handlers. For example debuggers
860	>	* use exceptions and the exception hander is in another
861	>	* process in such a case. (Timothy J. Wood states in his
862	>	* message to the list that he based this code on that from
863	>	* gdb for Darwin.)
864	>	*/
865	>	static inline kern_return_t
866	>	forward_exception(mach_port_t thread_port,
867	>	mach_port_t task_port,
868	>	exception_type_t exception_type,
869	>	exception_data_t exception_data,
870	>	mach_msg_type_number_t data_count,
871	>	ExceptionPorts *oldExceptionPorts)
872	>	{
873	>	kern_return_t kret;
874	>	unsigned int portIndex;
875	>	mach_port_t port;
876	>	exception_behavior_t behavior;
877	>	thread_state_flavor_t flavor;
878	>	thread_state_t thread_state;
879	>	mach_msg_type_number_t thread_state_count;
880	>
881	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
882	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
883	>	// This handler wants the exception
884	>	break;
885	>	}
886	>	}
887	>
888	>	if (portIndex >= oldExceptionPorts->maskCount) {
889	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
890	>	return KERN_FAILURE;
891	>	}
892	>
893	>	port = oldExceptionPorts->handlers[portIndex];
894	>	behavior = oldExceptionPorts->behaviors[portIndex];
895	>	flavor = oldExceptionPorts->flavors[portIndex];
896	>
897	>	/*
898	>	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
899	>	*/
900	>
901	>	if (behavior != EXCEPTION_DEFAULT) {
902	>	thread_state_count = THREAD_STATE_MAX;
903	>	kret = thread_get_state (thread_port, flavor, thread_state,
904	>	&thread_state_count);
905	>	MACH_CHECK_ERROR (thread_get_state, kret);
906		}
907	+
908	+	switch (behavior) {
909	+	case EXCEPTION_DEFAULT:
910	+	// fprintf(stderr, "forwarding to exception_raise\n");
911	+	kret = exception_raise(port, thread_port, task_port, exception_type,
912	+	exception_data, data_count);
913	+	MACH_CHECK_ERROR (exception_raise, kret);
914	+	break;
915	+	case EXCEPTION_STATE:
916	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
917	+	kret = exception_raise_state(port, exception_type, exception_data,
918	+	data_count, &flavor,
919	+	thread_state, thread_state_count,
920	+	thread_state, &thread_state_count);
921	+	MACH_CHECK_ERROR (exception_raise_state, kret);
922	+	break;
923	+	case EXCEPTION_STATE_IDENTITY:
924	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
925	+	kret = exception_raise_state_identity(port, thread_port, task_port,
926	+	exception_type, exception_data,
927	+	data_count, &flavor,
928	+	thread_state, thread_state_count,
929	+	thread_state, &thread_state_count);
930	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
931	+	break;
932	+	default:
933	+	fprintf(stderr, "forward_exception got unknown behavior\n");
934	+	break;
935	+	}
936	+
937	+	if (behavior != EXCEPTION_DEFAULT) {
938	+	kret = thread_set_state (thread_port, flavor, thread_state,
939	+	thread_state_count);
940	+	MACH_CHECK_ERROR (thread_set_state, kret);
941	+	}
942	+
943	+	return KERN_SUCCESS;
944	+	}
945	+
946	+	/*
947	+	* This is the code that actually handles the exception.
948	+	* It is called by exc_server. For Darwin 5 Apple changed
949	+	* this a bit from how this family of functions worked in
950	+	* Mach. If you are familiar with that it is a little
951	+	* different. The main variation that concerns us here is
952	+	* that code is an array of exception specific codes and
953	+	* codeCount is a count of the number of codes in the code
954	+	* array. In typical Mach all exceptions have a code
955	+	* and sub-code. It happens to be the case that for a
956	+	* EXC_BAD_ACCESS exception the first entry is the type of
957	+	* bad access that occurred and the second entry is the
958	+	* faulting address so these entries correspond exactly to
959	+	* how the code and sub-code are used on Mach.
960	+	*
961	+	* This is a MIG interface. No code in Basilisk II should
962	+	* call this directley. This has to have external C
963	+	* linkage because that is what exc_server expects.
964	+	*/
965	+	kern_return_t
966	+	catch_exception_raise(mach_port_t exception_port,
967	+	mach_port_t thread,
968	+	mach_port_t task,
969	+	exception_type_t exception,
970	+	exception_data_t code,
971	+	mach_msg_type_number_t codeCount)
972	+	{
973	+	ppc_thread_state_t state;
974	+	kern_return_t krc;
975	+
976	+	if ((exception == EXC_BAD_ACCESS) && (codeCount >= 2)) {
977	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
978	+	return KERN_SUCCESS;
979	+	}
980	+
981	+	// In Mach we do not need to remove the exception handler.
982	+	// If we forward the exception, eventually some exception handler
983	+	// will take care of this exception.
984	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
985	+
986	+	return krc;
987	+	}
988		#endif
989
990	<	if (!fault_recovered) {
991	<	// FAIL: reinstall default handler for "safe" crash
990	>	#ifdef HAVE_SIGSEGV_RECOVERY
991	>	// Handle bad memory accesses with signal handler
992	>	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
993	>	{
994	>	// Call handler and reinstall the global handler, if required
995	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
996	>	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
997	>	sigsegv_do_install_handler(sig);
998	>	#endif
999	>	return;
1000	>	}
1001	>
1002	>	// Failure: reinstall default handler for "safe" crash
1003		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1004	<	SIGSEGV_ALL_SIGNALS
1004	>	SIGSEGV_ALL_SIGNALS
1005		#undef FAULT_HANDLER
510	–
511	–	// We can't do anything with the fault_address, dump state?
512	–	if (sigsegv_state_dumper != 0)
513	–	sigsegv_state_dumper(fault_address, fault_instruction);
514	–	}
1006		}
1007		#endif
1008
#	Line 525 \| Line 1016 \| static bool sigsegv_do_install_handler(i
1016		{
1017		// Setup SIGSEGV handler to process writes to frame buffer
1018		#ifdef HAVE_SIGACTION
1019	<	struct sigaction vosf_sa;
1020	<	sigemptyset(&vosf_sa.sa_mask);
1021	<	vosf_sa.sa_sigaction = sigsegv_handler;
1022	<	vosf_sa.sa_flags = SA_SIGINFO;
1023	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1019	>	struct sigaction sigsegv_sa;
1020	>	sigemptyset(&sigsegv_sa.sa_mask);
1021	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1022	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1023	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1024		#else
1025		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1026		#endif
#	Line 541 \| Line 1032 \| static bool sigsegv_do_install_handler(i
1032		{
1033		// Setup SIGSEGV handler to process writes to frame buffer
1034		#ifdef HAVE_SIGACTION
1035	<	struct sigaction vosf_sa;
1036	<	sigemptyset(&vosf_sa.sa_mask);
1037	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1035	>	struct sigaction sigsegv_sa;
1036	>	sigemptyset(&sigsegv_sa.sa_mask);
1037	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1038	>	sigsegv_sa.sa_flags = 0;
1039		#if !EMULATED_68K && defined(__NetBSD__)
1040	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1041	<	vosf_sa.sa_flags = SA_ONSTACK;
550	<	#else
551	<	vosf_sa.sa_flags = 0;
1040	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1041	>	sigsegv_sa.sa_flags \|= SA_ONSTACK;
1042		#endif
1043	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1043	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1044		#else
1045		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1046		#endif
1047		}
1048		#endif
1049
1050	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1050	>	#if defined(HAVE_MACH_EXCEPTIONS)
1051	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1052		{
1053	<	#ifdef HAVE_SIGSEGV_RECOVERY
1053	>	/*
1054	>	* Except for the exception port functions, this should be
1055	>	* pretty much stock Mach. If later you choose to support
1056	>	* other Mach's besides Darwin, just check for __MACH__
1057	>	* here and __APPLE__ where the actual differences are.
1058	>	*/
1059	>	#if defined(__APPLE__) && defined(__MACH__)
1060	>	if (sigsegv_fault_handler != NULL) {
1061	>	sigsegv_fault_handler = handler;
1062	>	return true;
1063	>	}
1064	>
1065	>	kern_return_t krc;
1066	>
1067	>	// create the the exception port
1068	>	krc = mach_port_allocate(mach_task_self(),
1069	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1070	>	if (krc != KERN_SUCCESS) {
1071	>	mach_error("mach_port_allocate", krc);
1072	>	return false;
1073	>	}
1074	>
1075	>	// add a port send right
1076	>	krc = mach_port_insert_right(mach_task_self(),
1077	>	_exceptionPort, _exceptionPort,
1078	>	MACH_MSG_TYPE_MAKE_SEND);
1079	>	if (krc != KERN_SUCCESS) {
1080	>	mach_error("mach_port_insert_right", krc);
1081	>	return false;
1082	>	}
1083	>
1084	>	// get the old exception ports
1085	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1086	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1087	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1088	>	if (krc != KERN_SUCCESS) {
1089	>	mach_error("thread_get_exception_ports", krc);
1090	>	return false;
1091	>	}
1092	>
1093	>	// set the new exception port
1094	>	//
1095	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1096	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1097	>	// message, but it turns out that in the common case this is not
1098	>	// neccessary. If we need it we can later ask for it from the
1099	>	// suspended thread.
1100	>	//
1101	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1102	>	// counter in the thread state. The comments in the header file
1103	>	// seem to imply that you can count on the GPR's on an exception
1104	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1105	>	// you have to ask for all of the GPR's anyway just to get the
1106	>	// program counter. In any case because of update effective
1107	>	// address from immediate and update address from effective
1108	>	// addresses of ra and rb modes (as good an name as any for these
1109	>	// addressing modes) used in PPC instructions, you will need the
1110	>	// GPR state anyway.
1111	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1112	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1113	>	if (krc != KERN_SUCCESS) {
1114	>	mach_error("thread_set_exception_ports", krc);
1115	>	return false;
1116	>	}
1117	>
1118	>	// create the exception handler thread
1119	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1120	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1121	>	return false;
1122	>	}
1123	>
1124	>	// do not care about the exception thread any longer, let is run standalone
1125	>	(void)pthread_detach(exc_thread);
1126	>
1127		sigsegv_fault_handler = handler;
1128	+	return true;
1129	+	#else
1130	+	return false;
1131	+	#endif
1132	+	}
1133	+	#endif
1134	+
1135	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1136	+	{
1137	+	#if defined(HAVE_SIGSEGV_RECOVERY)
1138		bool success = true;
1139		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1140		SIGSEGV_ALL_SIGNALS
1141		#undef FAULT_HANDLER
1142	+	if (success)
1143	+	sigsegv_fault_handler = handler;
1144		return success;
1145	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1146	+	return sigsegv_do_install_handler(handler);
1147		#else
1148		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1149		return false;
#	Line 579 \| Line 1157 \| bool sigsegv_install_handler(sigsegv_fau
1157
1158		void sigsegv_deinstall_handler(void)
1159		{
1160	+	// We do nothing for Mach exceptions, the thread would need to be
1161	+	// suspended if not already so, and we might mess with other
1162	+	// exception handlers that came after we registered ours. There is
1163	+	// no need to remove the exception handler, in fact this function is
1164	+	// not called anywhere in Basilisk II.
1165		#ifdef HAVE_SIGSEGV_RECOVERY
1166		sigsegv_fault_handler = 0;
1167		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
#	Line 589 \| Line 1172 \| void sigsegv_deinstall_handler(void)
1172
1173
1174		/*
592	–	* SIGSEGV ignore state modifier
593	–	*/
594	–
595	–	void sigsegv_set_ignore_state(bool ignore_fault)
596	–	{
597	–	sigsegv_ignore_fault = ignore_fault;
598	–	}
599	–
600	–
601	–	/*
1175		* Set callback function when we cannot handle the fault
1176		*/
1177
#	Line 623 \| Line 1196 \| static int page_size;
1196		static volatile char * page = 0;
1197		static volatile int handler_called = 0;
1198
1199	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1199	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1200		{
1201		handler_called++;
1202		if ((fault_address - 123) != page)
1203	<	exit(1);
1203	>	exit(10);
1204		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ \| VM_PAGE_WRITE) != 0)
1205	<	exit(1);
1206	<	return true;
1205	>	exit(11);
1206	>	return SIGSEGV_RETURN_SUCCESS;
1207		}
1208
1209		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1210	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1210	>	#ifdef __GNUC__
1211	>	// Code range where we expect the fault to come from
1212	>	static void b_region, e_region;
1213	>	#endif
1214	>
1215	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1216		{
1217	<	return false;
1217	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1218	>	#ifdef __GNUC__
1219	>	// Make sure reported fault instruction address falls into
1220	>	// expected code range
1221	>	if (instruction_address != SIGSEGV_INVALID_PC
1222	>	&& ((instruction_address < (sigsegv_address_t)b_region) \|\|
1223	>	(instruction_address >= (sigsegv_address_t)e_region)))
1224	>	return SIGSEGV_RETURN_FAILURE;
1225	>	#endif
1226	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1227	>	}
1228	>
1229	>	return SIGSEGV_RETURN_FAILURE;
1230		}
1231		#endif
1232
#	Line 647 \| Line 1237 \| int main(void)
1237
1238		page_size = getpagesize();
1239		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1240	<	return 1;
1240	>	return 2;
1241
1242		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1243	<	return 1;
1243	>	return 3;
1244
1245		if (!sigsegv_install_handler(sigsegv_test_handler))
1246	<	return 1;
1246	>	return 4;
1247
1248		page[123] = 45;
1249		page[123] = 45;
1250
1251		if (handler_called != 1)
1252	<	return 1;
1252	>	return 5;
1253
1254		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1255		if (!sigsegv_install_handler(sigsegv_insn_handler))
1256	<	return 1;
1256	>	return 6;
1257
1258	<	if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0)
1259	<	return 1;
1258	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ \| VM_PAGE_WRITE) < 0)
1259	>	return 7;
1260
1261		for (int i = 0; i < page_size; i++)
1262		page[i] = (i + 1) % page_size;
1263
1264		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1265	<	return 1;
1265	>	return 8;
1266
677	–	sigsegv_set_ignore_state(true);
678	–
1267		#define TEST_SKIP_INSTRUCTION(TYPE) do { \
1268		const unsigned int TAG = 0x12345678; \
1269		TYPE data = ((TYPE )(page + sizeof(TYPE))); \
1270		volatile unsigned int effect = data + TAG; \
1271		if (effect != TAG) \
1272	<	return 1; \
1272	>	return 9; \
1273		} while (0)
1274
1275	+	#ifdef __GNUC__
1276	+	b_region = &&L_b_region;
1277	+	e_region = &&L_e_region;
1278	+	#endif
1279	+	L_b_region:
1280		TEST_SKIP_INSTRUCTION(unsigned char);
1281		TEST_SKIP_INSTRUCTION(unsigned short);
1282		TEST_SKIP_INSTRUCTION(unsigned int);
1283	+	L_e_region:
1284		#endif
1285
1286		vm_exit();

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+Removed lines
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Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents): Revision 1.12 by gbeauche, 2002-05-16T15:48:06Z vs. Revision 1.31 by gbeauche, 2003-10-13T20:15:41Z

Diff Legend

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.12 by gbeauche, 2002-05-16T15:48:06Z vs.
Revision 1.31 by gbeauche, 2003-10-13T20:15:41Z