[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 1.33 by gbeauche, 2003-10-21T23:10:19Z

#	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(__sun__)
225	+	#if (defined(sparc) \|\| defined(__sparc__))
226	+	#include <sys/ucontext.h>
227	+	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
228	+	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[REG_PC]
229	+	#endif
230	+	#endif
231	+	#if defined(__FreeBSD__)
232	+	#if (defined(i386) \|\| defined(__i386__))
233	+	#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext *)scp)->sc_eip)
234	+	#define SIGSEGV_REGISTER_FILE ((unsigned int )&(((struct sigcontext )scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
235	+	#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
236	+	#endif
237	+	#endif
238		#if defined(__linux__)
239		#if (defined(i386) \|\| defined(__i386__))
240		#include <sys/ucontext.h>
241	<	#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t )scp)->uc_mcontext.gregs[14]) / should use REG_EIP instead */
242	<	#define SIGSEGV_REGISTER_FILE (unsigned long )(((ucontext_t )scp)->uc_mcontext.gregs)
241	>	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
242	>	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
243	>	#define SIGSEGV_REGISTER_FILE (unsigned int *)SIGSEGV_CONTEXT_REGS
244		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
245		#endif
246	+	#if (defined(x86_64) \|\| defined(__x86_64__))
247	+	#include <sys/ucontext.h>
248	+	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.gregs)
249	+	#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
250	+	#define SIGSEGV_REGISTER_FILE (unsigned long *)SIGSEGV_CONTEXT_REGS
251	+	#endif
252		#if (defined(ia64) \|\| defined(__ia64__))
253		#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext )scp)->sc_ip & ~0x3ULL) / slot number is in bits 0 and 1 */
254		#endif
255		#if (defined(powerpc) \|\| defined(__powerpc__))
256		#include <sys/ucontext.h>
257	<	#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t *)scp)->uc_mcontext.regs->nip)
257	>	#define SIGSEGV_CONTEXT_REGS (((ucontext_t *)scp)->uc_mcontext.regs)
258	>	#define SIGSEGV_FAULT_INSTRUCTION (SIGSEGV_CONTEXT_REGS->nip)
259	>	#define SIGSEGV_REGISTER_FILE (unsigned int )&SIGSEGV_CONTEXT_REGS->nip, (unsigned int )(SIGSEGV_CONTEXT_REGS->gpr)
260	>	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
261		#endif
262		#endif
263		#endif
#	Line 90 \| Line 269 \| static bool sigsegv_do_install_handler(i
269		#if (defined(i386) \|\| defined(__i386__))
270		#include <asm/sigcontext.h>
271		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext scs
272	<	#define SIGSEGV_FAULT_ADDRESS scs.cr2
273	<	#define SIGSEGV_FAULT_INSTRUCTION scs.eip
274	<	#define SIGSEGV_REGISTER_FILE (unsigned long *)(&scs)
272	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
273	>	#define SIGSEGV_FAULT_HANDLER_ARGS &scs
274	>	#define SIGSEGV_FAULT_ADDRESS scp->cr2
275	>	#define SIGSEGV_FAULT_INSTRUCTION scp->eip
276	>	#define SIGSEGV_REGISTER_FILE (unsigned int *)scp
277		#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
278		#endif
279		#if (defined(sparc) \|\| defined(__sparc__))
280		#include <asm/sigcontext.h>
281		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext scp, char addr
282	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr
283		#define SIGSEGV_FAULT_ADDRESS addr
284		#endif
285		#if (defined(powerpc) \|\| defined(__powerpc__))
286		#include <asm/sigcontext.h>
287		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp
288	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, scp
289		#define SIGSEGV_FAULT_ADDRESS scp->regs->dar
290		#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip
291	+	#define SIGSEGV_REGISTER_FILE (unsigned int )&scp->regs->nip, (unsigned int )(scp->regs->gpr)
292	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
293		#endif
294		#if (defined(alpha) \|\| defined(__alpha__))
295		#include <asm/sigcontext.h>
296		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
297	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
298		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
299		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_pc
114	–
115	–	// From Boehm's GC 6.0alpha8
116	–	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
117	–	{
118	–	unsigned int instruction = ((unsigned int )(scp->sc_pc));
119	–	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
120	–	fault_address += (signed long)(signed short)(instruction & 0xffff);
121	–	return (sigsegv_address_t)fault_address;
122	–	}
300		#endif
301		#endif
302
#	Line 127 \| Line 304 \| static sigsegv_address_t get_fault_addre
304		#if (defined(sgi) \|\| defined(__sgi)) && (defined(SYSTYPE_SVR4) \|\| defined(__SYSTYPE_SVR4))
305		#include <ucontext.h>
306		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
307	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
308		#define SIGSEGV_FAULT_ADDRESS scp->sc_badvaddr
309		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
310		#endif
#	Line 134 \| Line 312 \| static sigsegv_address_t get_fault_addre
312		// HP-UX
313		#if (defined(hpux) \|\| defined(__hpux__))
314		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
315	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
316		#define SIGSEGV_FAULT_ADDRESS scp->sc_sl.sl_ss.ss_narrow.ss_cr21
317		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
318		#endif
#	Line 142 \| Line 321 \| static sigsegv_address_t get_fault_addre
321		#if defined(__osf__)
322		#include <ucontext.h>
323		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
324	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
325		#define SIGSEGV_FAULT_ADDRESS scp->sc_traparg_a0
326		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
327		#endif
#	Line 149 \| Line 329 \| static sigsegv_address_t get_fault_addre
329		// AIX
330		#if defined(_AIX)
331		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
332	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
333		#define SIGSEGV_FAULT_ADDRESS scp->sc_jmpbuf.jmp_context.o_vaddr
334		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
335		#endif
336
337	<	// NetBSD or FreeBSD
338	<	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
337	>	// NetBSD
338	>	#if defined(__NetBSD__)
339		#if (defined(m68k) \|\| defined(__m68k__))
340		#include <m68k/frame.h>
341		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
342	<	#define SIGSEGV_FAULT_ADDRESS ({ \
343	<	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	<	})
342	>	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
343	>	#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
344		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
345	<	#else
346	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, void scp, char addr
347	<	#define SIGSEGV_FAULT_ADDRESS addr
345	>
346	>	// Use decoding scheme from BasiliskII/m68k native
347	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
348	>	{
349	>	struct sigstate {
350	>	int ss_flags;
351	>	struct frame ss_frame;
352	>	};
353	>	struct sigstate state = (struct sigstate )scp->sc_ap;
354	>	char *fault_addr;
355	>	switch (state->ss_frame.f_format) {
356	>	case 7: /* 68040 access error */
357	>	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
358	>	fault_addr = state->ss_frame.f_fmt7.f_fa;
359	>	break;
360	>	default:
361	>	fault_addr = (char *)code;
362	>	break;
363	>	}
364	>	return (sigsegv_address_t)fault_addr;
365	>	}
366	>	#endif
367	>	#if (defined(alpha) \|\| defined(__alpha__))
368	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
369	>	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
370	>	#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
371	>	#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
372	>	#endif
373	>	#if (defined(i386) \|\| defined(__i386__))
374	>	#error "FIXME: need to decode instruction and compute EA"
375	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
376	>	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
377	>	#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
378	>	#endif
379	>	#endif
380	>	#if defined(__FreeBSD__)
381		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
382	+	#if (defined(i386) \|\| defined(__i386__))
383	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext scp, char addr
384	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp, addr
385	+	#define SIGSEGV_FAULT_ADDRESS addr
386	+	#define SIGSEGV_FAULT_INSTRUCTION scp->sc_eip
387	+	#define SIGSEGV_REGISTER_FILE ((unsigned int *)&scp->sc_edi)
388	+	#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction
389		#endif
390		#endif
391
392	<	// MacOS X
392	>	// Extract fault address out of a sigcontext
393	>	#if (defined(alpha) \|\| defined(__alpha__))
394	>	// From Boehm's GC 6.0alpha8
395	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
396	>	{
397	>	unsigned int instruction = ((unsigned int )(scp->sc_pc));
398	>	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
399	>	fault_address += (signed long)(signed short)(instruction & 0xffff);
400	>	return (sigsegv_address_t)fault_address;
401	>	}
402	>	#endif
403	>
404	>
405	>	// MacOS X, not sure which version this works in. Under 10.1
406	>	// vm_protect does not appear to work from a signal handler. Under
407	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
408	>	// field is the address of the faulting instruction and not the
409	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
410	>	// case with Mach exception handlers there is a way to do what this
411	>	// was meant to do.
412	>	#ifndef HAVE_MACH_EXCEPTIONS
413		#if defined(__APPLE__) && defined(__MACH__)
414		#if (defined(ppc) \|\| defined(__ppc__))
415		#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
416	+	#define SIGSEGV_FAULT_HANDLER_ARGS sig, code, scp
417		#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
418		#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir
419		#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
420	+	#define SIGSEGV_REGISTER_FILE (unsigned int )&scp->sc_ir, &((unsigned int ) scp->sc_regs)[2]
421	+	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
422
423	<	// 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	<
423	>	// Use decoding scheme from SheepShaver
424		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
425		{
426	<	unsigned int instr = ((unsigned int ) scp->sc_ir);
427	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
428	<	int disp = 0, tmp;
429	<	unsigned int baseA = 0, baseB = 0;
430	<	unsigned int addr, alignmask = 0xFFFFFFFF;
431	<
432	<	switch(EXTRACT_OP1(instr)) {
433	<	case 38: /* stb */
434	<	case 39: /* stbu */
435	<	case 54: /* stfd */
436	<	case 55: /* stfdu */
437	<	case 52: /* stfs */
438	<	case 53: /* stfsu */
439	<	case 44: /* sth */
440	<	case 45: /* sthu */
441	<	case 47: /* stmw */
442	<	case 36: /* stw */
443	<	case 37: /* stwu */
444	<	tmp = EXTRACT_REGA(instr);
445	<	if(tmp > 0)
446	<	baseA = regs[tmp];
447	<	disp = EXTRACT_DISP(instr);
448	<	break;
449	<	case 31:
450	<	switch(EXTRACT_OP2(instr)) {
451	<	case 86: /* dcbf */
452	<	case 54: /* dcbst */
453	<	case 1014: /* dcbz */
454	<	case 247: /* stbux */
455	<	case 215: /* stbx */
456	<	case 759: /* stfdux */
457	<	case 727: /* stfdx */
458	<	case 983: /* stfiwx */
459	<	case 695: /* stfsux */
460	<	case 663: /* stfsx */
461	<	case 918: /* sthbrx */
462	<	case 439: /* sthux */
463	<	case 407: /* sthx */
464	<	case 661: /* stswx */
465	<	case 662: /* stwbrx */
466	<	case 150: /* stwcx. */
467	<	case 183: /* stwux */
468	<	case 151: /* stwx */
469	<	case 135: /* stvebx */
470	<	case 167: /* stvehx */
471	<	case 199: /* stvewx */
472	<	case 231: /* stvx */
473	<	case 487: /* stvxl */
474	<	tmp = EXTRACT_REGA(instr);
475	<	if(tmp > 0)
476	<	baseA = regs[tmp];
477	<	baseB = regs[EXTRACT_REGC(instr)];
478	<	/* determine Altivec alignment mask */
479	<	switch(EXTRACT_OP2(instr)) {
480	<	case 167: /* stvehx */
481	<	alignmask = 0xFFFFFFFE;
482	<	break;
483	<	case 199: /* stvewx */
484	<	alignmask = 0xFFFFFFFC;
485	<	break;
486	<	case 231: /* stvx */
487	<	alignmask = 0xFFFFFFF0;
488	<	break;
489	<	case 487: /* stvxl */
490	<	alignmask = 0xFFFFFFF0;
491	<	break;
492	<	}
493	<	break;
494	<	case 725: /* stswi */
495	<	tmp = EXTRACT_REGA(instr);
496	<	if(tmp > 0)
497	<	baseA = regs[tmp];
498	<	break;
499	<	default: /* ignore instruction */
500	<	return 0;
501	<	break;
426	>	unsigned int nip = (unsigned int) scp->sc_ir;
427	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
428	>	instruction_t instr;
429	>
430	>	powerpc_decode_instruction(&instr, nip, gpr);
431	>	return (sigsegv_address_t)instr.addr;
432	>	}
433	>	#endif
434	>	#endif
435	>	#endif
436	>	#endif
437	>
438	>	#if HAVE_MACH_EXCEPTIONS
439	>
440	>	// This can easily be extended to other Mach systems, but really who
441	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
442	>	// Mach 2.5/3.0?
443	>	#if defined(__APPLE__) && defined(__MACH__)
444	>
445	>	#include <sys/types.h>
446	>	#include <stdlib.h>
447	>	#include <stdio.h>
448	>	#include <pthread.h>
449	>
450	>	/*
451	>	* If you are familiar with MIG then you will understand the frustration
452	>	* that was necessary to get these embedded into C++ code by hand.
453	>	*/
454	>	extern "C" {
455	>	#include <mach/mach.h>
456	>	#include <mach/mach_error.h>
457	>
458	>	extern boolean_t exc_server(mach_msg_header_t , mach_msg_header_t );
459	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
460	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
461	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
462	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
463	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
464	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
465	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
466	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
467	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
468	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
469	>	}
470	>
471	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
472	>	#define HANDLER_COUNT 64
473	>
474	>	// structure to tuck away existing exception handlers
475	>	typedef struct _ExceptionPorts {
476	>	mach_msg_type_number_t maskCount;
477	>	exception_mask_t masks[HANDLER_COUNT];
478	>	exception_handler_t handlers[HANDLER_COUNT];
479	>	exception_behavior_t behaviors[HANDLER_COUNT];
480	>	thread_state_flavor_t flavors[HANDLER_COUNT];
481	>	} ExceptionPorts;
482	>
483	>	// exception handler thread
484	>	static pthread_t exc_thread;
485	>
486	>	// place where old exception handler info is stored
487	>	static ExceptionPorts ports;
488	>
489	>	// our exception port
490	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
491	>
492	>	#define MACH_CHECK_ERROR(name,ret) \
493	>	if (ret != KERN_SUCCESS) { \
494	>	mach_error(#name, ret); \
495	>	exit (1); \
496	>	}
497	>
498	>	#define SIGSEGV_FAULT_ADDRESS code[1]
499	>	#define SIGSEGV_FAULT_INSTRUCTION get_fault_instruction(thread, state)
500	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP) ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
501	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
502	>	#define SIGSEGV_FAULT_HANDLER_ARGS thread, code, &state
503	>	#define SIGSEGV_SKIP_INSTRUCTION powerpc_skip_instruction
504	>	#define SIGSEGV_REGISTER_FILE &state->srr0, &state->r0
505	>
506	>	// Given a suspended thread, stuff the current instruction and
507	>	// registers into state.
508	>	//
509	>	// It would have been nice to have this be ppc/x86 independant which
510	>	// could have been done easily with a thread_state_t instead of
511	>	// ppc_thread_state_t, but because of the way this is called it is
512	>	// easier to do it this way.
513	>	#if (defined(ppc) \|\| defined(__ppc__))
514	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
515	>	{
516	>	kern_return_t krc;
517	>	mach_msg_type_number_t count;
518	>
519	>	count = MACHINE_THREAD_STATE_COUNT;
520	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
521	>	MACH_CHECK_ERROR (thread_get_state, krc);
522	>
523	>	return (sigsegv_address_t)state->srr0;
524	>	}
525	>	#endif
526	>
527	>	// Since there can only be one exception thread running at any time
528	>	// this is not a problem.
529	>	#define MSG_SIZE 512
530	>	static char msgbuf[MSG_SIZE];
531	>	static char replybuf[MSG_SIZE];
532	>
533	>	/*
534	>	* This is the entry point for the exception handler thread. The job
535	>	* of this thread is to wait for exception messages on the exception
536	>	* port that was setup beforehand and to pass them on to exc_server.
537	>	* exc_server is a MIG generated function that is a part of Mach.
538	>	* Its job is to decide what to do with the exception message. In our
539	>	* case exc_server calls catch_exception_raise on our behalf. After
540	>	* exc_server returns, it is our responsibility to send the reply.
541	>	*/
542	>	static void *
543	>	handleExceptions(void *priv)
544	>	{
545	>	mach_msg_header_t msg, reply;
546	>	kern_return_t krc;
547	>
548	>	msg = (mach_msg_header_t *)msgbuf;
549	>	reply = (mach_msg_header_t *)replybuf;
550	>
551	>	for (;;) {
552	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
553	>	_exceptionPort, 0, MACH_PORT_NULL);
554	>	MACH_CHECK_ERROR(mach_msg, krc);
555	>
556	>	if (!exc_server(msg, reply)) {
557	>	fprintf(stderr, "exc_server hated the message\n");
558	>	exit(1);
559	>	}
560	>
561	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
562	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
563	>	if (krc != KERN_SUCCESS) {
564	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
565	>	krc, mach_error_string(krc));
566	>	exit(1);
567		}
282	–	break;
283	–	default: /* ignore instruction */
284	–	return 0;
285	–	break;
568		}
287	–
288	–	addr = (baseA + baseB) + disp;
289	–	addr &= alignmask;
290	–	return (sigsegv_address_t)addr;
569		}
570		#endif
571		#endif
572	<	#endif
572	>
573	>
574	>	/*
575	>	* Instruction skipping
576	>	*/
577
578		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
579		// Decode and skip X86 instruction
#	Line 309 \| Line 591 \| enum {
591		X86_REG_EDI = 4
592		};
593		#endif
594	+	#if defined(__NetBSD__) \|\| defined(__FreeBSD__)
595	+	enum {
596	+	X86_REG_EIP = 10,
597	+	X86_REG_EAX = 7,
598	+	X86_REG_ECX = 6,
599	+	X86_REG_EDX = 5,
600	+	X86_REG_EBX = 4,
601	+	X86_REG_ESP = 13,
602	+	X86_REG_EBP = 2,
603	+	X86_REG_ESI = 1,
604	+	X86_REG_EDI = 0
605	+	};
606	+	#endif
607		// FIXME: this is partly redundant with the instruction decoding phase
608		// to discover transfer type and register number
609		static inline int ix86_step_over_modrm(unsigned char * p)
#	Line 343 \| Line 638 \| static inline int ix86_step_over_modrm(u
638		return offset;
639		}
640
641	<	static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs)
641	>	static bool ix86_skip_instruction(unsigned int * regs)
642		{
643	<	unsigned char * eip = (unsigned char *)fault_instruction;
643	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
644
645		if (eip == 0)
646		return false;
647
648	<	// Transfer type
649	<	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;
648	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
649	>	transfer_size_t transfer_size = SIZE_LONG;
650
651		int reg = -1;
652		int len = 0;
#	Line 376 \| Line 660 \| static bool ix86_skip_instruction(sigseg
660
661		// Decode instruction
662		switch (eip[0]) {
663	+	case 0x0f:
664	+	switch (eip[1]) {
665	+	case 0xb6: // MOVZX r32, r/m8
666	+	case 0xb7: // MOVZX r32, r/m16
667	+	switch (eip[2] & 0xc0) {
668	+	case 0x80:
669	+	reg = (eip[2] >> 3) & 7;
670	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
671	+	break;
672	+	case 0x40:
673	+	reg = (eip[2] >> 3) & 7;
674	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
675	+	break;
676	+	case 0x00:
677	+	reg = (eip[2] >> 3) & 7;
678	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
679	+	break;
680	+	}
681	+	len += 3 + ix86_step_over_modrm(eip + 2);
682	+	break;
683	+	}
684	+	break;
685		case 0x8a: // MOV r8, r/m8
686		transfer_size = SIZE_BYTE;
687		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
688		switch (eip[1] & 0xc0) {
689		case 0x80:
690		reg = (eip[1] >> 3) & 7;
691	<	transfer_type = TYPE_LOAD;
691	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
692		break;
693		case 0x40:
694		reg = (eip[1] >> 3) & 7;
695	<	transfer_type = TYPE_LOAD;
695	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
696		break;
697		case 0x00:
698		reg = (eip[1] >> 3) & 7;
699	<	transfer_type = TYPE_LOAD;
699	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
700		break;
701		}
702		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 401 \| Line 707 \| static bool ix86_skip_instruction(sigseg
707		switch (eip[1] & 0xc0) {
708		case 0x80:
709		reg = (eip[1] >> 3) & 7;
710	<	transfer_type = TYPE_STORE;
710	>	transfer_type = SIGSEGV_TRANSFER_STORE;
711		break;
712		case 0x40:
713		reg = (eip[1] >> 3) & 7;
714	<	transfer_type = TYPE_STORE;
714	>	transfer_type = SIGSEGV_TRANSFER_STORE;
715		break;
716		case 0x00:
717		reg = (eip[1] >> 3) & 7;
718	<	transfer_type = TYPE_STORE;
718	>	transfer_type = SIGSEGV_TRANSFER_STORE;
719		break;
720		}
721		len += 2 + ix86_step_over_modrm(eip + 1);
722		break;
723		}
724
725	<	if (transfer_type == TYPE_UNKNOWN) {
725	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
726		// Unknown machine code, let it crash. Then patch the decoder
727		return false;
728		}
729
730	<	if (transfer_type == TYPE_LOAD && reg != -1) {
730	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
731		static const int x86_reg_map[8] = {
732		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
733		X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
#	Line 447 \| Line 753 \| static bool ix86_skip_instruction(sigseg
753		#if DEBUG
754		printf("%08x: %s %s access", regs[X86_REG_EIP],
755		transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
756	<	transfer_type == TYPE_LOAD ? "read" : "write");
756	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
757
758		if (reg != -1) {
759		static const char * x86_reg_str_map[8] = {
760		"eax", "ecx", "edx", "ebx",
761		"esp", "ebp", "esi", "edi"
762		};
763	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
763	>	printf(" %s register %%%s", transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from", x86_reg_str_map[reg]);
764		}
765		printf(", %d bytes instruction\n", len);
766		#endif
#	Line 463 \| Line 769 \| static bool ix86_skip_instruction(sigseg
769		return true;
770		}
771		#endif
772	+
773	+	// Decode and skip PPC instruction
774	+	#if (defined(powerpc) \|\| defined(__powerpc__) \|\| defined(__ppc__))
775	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
776	+	{
777	+	instruction_t instr;
778	+	powerpc_decode_instruction(&instr, *nip_p, regs);
779	+
780	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
781	+	// Unknown machine code, let it crash. Then patch the decoder
782	+	return false;
783	+	}
784	+
785	+	#if DEBUG
786	+	printf("%08x: %s %s access", *nip_p,
787	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
788	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
789	+
790	+	if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
791	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
792	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
793	+	printf(" r%d (rd = 0)\n", instr.rd);
794	+	#endif
795	+
796	+	if (instr.addr_mode == MODE_U \|\| instr.addr_mode == MODE_UX)
797	+	regs[instr.ra] = instr.addr;
798	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
799	+	regs[instr.rd] = 0;
800	+
801	+	*nip_p += 4;
802	+	return true;
803	+	}
804	+	#endif
805		#endif
806
807		// Fallbacks
808		#ifndef SIGSEGV_FAULT_INSTRUCTION
809		#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_INVALID_PC
810		#endif
811	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
812	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
813	+	#endif
814	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
815	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP) sigsegv_fault_handler(ADDR, IP)
816	+	#endif
817
818		// SIGSEGV recovery supported ?
819		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 480 \| Line 825 \| static bool ix86_skip_instruction(sigseg
825		* SIGSEGV global handler
826		*/
827
828	<	#ifdef HAVE_SIGSEGV_RECOVERY
829	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
828	>	#if defined(HAVE_SIGSEGV_RECOVERY) \|\| defined(HAVE_MACH_EXCEPTIONS)
829	>	// This function handles the badaccess to memory.
830	>	// It is called from the signal handler or the exception handler.
831	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
832		{
833		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
834		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
488	–	bool fault_recovered = false;
835
836		// Call user's handler and reinstall the global handler, if required
837	<	if (sigsegv_fault_handler(fault_address, fault_instruction)) {
838	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
839	<	sigsegv_do_install_handler(sig);
837	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
838	>	case SIGSEGV_RETURN_SUCCESS:
839	>	return true;
840	>
841	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
842	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
843	>	// Call the instruction skipper with the register file
844	>	// available
845	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
846	>	#ifdef HAVE_MACH_EXCEPTIONS
847	>	// Unlike UNIX signals where the thread state
848	>	// is modified off of the stack, in Mach we
849	>	// need to actually call thread_set_state to
850	>	// have the register values updated.
851	>	kern_return_t krc;
852	>
853	>	krc = thread_set_state(thread,
854	>	MACHINE_THREAD_STATE, (thread_state_t)state,
855	>	MACHINE_THREAD_STATE_COUNT);
856	>	MACH_CHECK_ERROR (thread_get_state, krc);
857	>	#endif
858	>	return true;
859	>	}
860	>	break;
861		#endif
495	–	fault_recovered = true;
862		}
863	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
864	<	else if (sigsegv_ignore_fault) {
865	<	// Call the instruction skipper with the register file available
866	<	if (SIGSEGV_SKIP_INSTRUCTION(fault_instruction, SIGSEGV_REGISTER_FILE))
867	<	fault_recovered = true;
863	>
864	>	// We can't do anything with the fault_address, dump state?
865	>	if (sigsegv_state_dumper != 0)
866	>	sigsegv_state_dumper(fault_address, fault_instruction);
867	>
868	>	return false;
869	>	}
870	>	#endif
871	>
872	>
873	>	/*
874	>	* There are two mechanisms for handling a bad memory access,
875	>	* Mach exceptions and UNIX signals. The implementation specific
876	>	* code appears below. Its reponsibility is to call handle_badaccess
877	>	* which is the routine that handles the fault in an implementation
878	>	* agnostic manner. The implementation specific code below is then
879	>	* reponsible for checking whether handle_badaccess was able
880	>	* to handle the memory access error and perform any implementation
881	>	* specific tasks necessary afterwards.
882	>	*/
883	>
884	>	#ifdef HAVE_MACH_EXCEPTIONS
885	>	/*
886	>	* We need to forward all exceptions that we do not handle.
887	>	* This is important, there are many exceptions that may be
888	>	* handled by other exception handlers. For example debuggers
889	>	* use exceptions and the exception hander is in another
890	>	* process in such a case. (Timothy J. Wood states in his
891	>	* message to the list that he based this code on that from
892	>	* gdb for Darwin.)
893	>	*/
894	>	static inline kern_return_t
895	>	forward_exception(mach_port_t thread_port,
896	>	mach_port_t task_port,
897	>	exception_type_t exception_type,
898	>	exception_data_t exception_data,
899	>	mach_msg_type_number_t data_count,
900	>	ExceptionPorts *oldExceptionPorts)
901	>	{
902	>	kern_return_t kret;
903	>	unsigned int portIndex;
904	>	mach_port_t port;
905	>	exception_behavior_t behavior;
906	>	thread_state_flavor_t flavor;
907	>	thread_state_t thread_state;
908	>	mach_msg_type_number_t thread_state_count;
909	>
910	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
911	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
912	>	// This handler wants the exception
913	>	break;
914	>	}
915	>	}
916	>
917	>	if (portIndex >= oldExceptionPorts->maskCount) {
918	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
919	>	return KERN_FAILURE;
920	>	}
921	>
922	>	port = oldExceptionPorts->handlers[portIndex];
923	>	behavior = oldExceptionPorts->behaviors[portIndex];
924	>	flavor = oldExceptionPorts->flavors[portIndex];
925	>
926	>	/*
927	>	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
928	>	*/
929	>
930	>	if (behavior != EXCEPTION_DEFAULT) {
931	>	thread_state_count = THREAD_STATE_MAX;
932	>	kret = thread_get_state (thread_port, flavor, thread_state,
933	>	&thread_state_count);
934	>	MACH_CHECK_ERROR (thread_get_state, kret);
935	>	}
936	>
937	>	switch (behavior) {
938	>	case EXCEPTION_DEFAULT:
939	>	// fprintf(stderr, "forwarding to exception_raise\n");
940	>	kret = exception_raise(port, thread_port, task_port, exception_type,
941	>	exception_data, data_count);
942	>	MACH_CHECK_ERROR (exception_raise, kret);
943	>	break;
944	>	case EXCEPTION_STATE:
945	>	// fprintf(stderr, "forwarding to exception_raise_state\n");
946	>	kret = exception_raise_state(port, exception_type, exception_data,
947	>	data_count, &flavor,
948	>	thread_state, thread_state_count,
949	>	thread_state, &thread_state_count);
950	>	MACH_CHECK_ERROR (exception_raise_state, kret);
951	>	break;
952	>	case EXCEPTION_STATE_IDENTITY:
953	>	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
954	>	kret = exception_raise_state_identity(port, thread_port, task_port,
955	>	exception_type, exception_data,
956	>	data_count, &flavor,
957	>	thread_state, thread_state_count,
958	>	thread_state, &thread_state_count);
959	>	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
960	>	break;
961	>	default:
962	>	fprintf(stderr, "forward_exception got unknown behavior\n");
963	>	break;
964	>	}
965	>
966	>	if (behavior != EXCEPTION_DEFAULT) {
967	>	kret = thread_set_state (thread_port, flavor, thread_state,
968	>	thread_state_count);
969	>	MACH_CHECK_ERROR (thread_set_state, kret);
970	>	}
971	>
972	>	return KERN_SUCCESS;
973	>	}
974	>
975	>	/*
976	>	* This is the code that actually handles the exception.
977	>	* It is called by exc_server. For Darwin 5 Apple changed
978	>	* this a bit from how this family of functions worked in
979	>	* Mach. If you are familiar with that it is a little
980	>	* different. The main variation that concerns us here is
981	>	* that code is an array of exception specific codes and
982	>	* codeCount is a count of the number of codes in the code
983	>	* array. In typical Mach all exceptions have a code
984	>	* and sub-code. It happens to be the case that for a
985	>	* EXC_BAD_ACCESS exception the first entry is the type of
986	>	* bad access that occurred and the second entry is the
987	>	* faulting address so these entries correspond exactly to
988	>	* how the code and sub-code are used on Mach.
989	>	*
990	>	* This is a MIG interface. No code in Basilisk II should
991	>	* call this directley. This has to have external C
992	>	* linkage because that is what exc_server expects.
993	>	*/
994	>	kern_return_t
995	>	catch_exception_raise(mach_port_t exception_port,
996	>	mach_port_t thread,
997	>	mach_port_t task,
998	>	exception_type_t exception,
999	>	exception_data_t code,
1000	>	mach_msg_type_number_t codeCount)
1001	>	{
1002	>	ppc_thread_state_t state;
1003	>	kern_return_t krc;
1004	>
1005	>	if ((exception == EXC_BAD_ACCESS) && (codeCount >= 2)) {
1006	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1007	>	return KERN_SUCCESS;
1008		}
1009	+
1010	+	// In Mach we do not need to remove the exception handler.
1011	+	// If we forward the exception, eventually some exception handler
1012	+	// will take care of this exception.
1013	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1014	+
1015	+	return krc;
1016	+	}
1017		#endif
1018
1019	<	if (!fault_recovered) {
1020	<	// FAIL: reinstall default handler for "safe" crash
1019	>	#ifdef HAVE_SIGSEGV_RECOVERY
1020	>	// Handle bad memory accesses with signal handler
1021	>	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1022	>	{
1023	>	// Call handler and reinstall the global handler, if required
1024	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1025	>	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1026	>	sigsegv_do_install_handler(sig);
1027	>	#endif
1028	>	return;
1029	>	}
1030	>
1031	>	// Failure: reinstall default handler for "safe" crash
1032		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1033	<	SIGSEGV_ALL_SIGNALS
1033	>	SIGSEGV_ALL_SIGNALS
1034		#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	–	}
1035		}
1036		#endif
1037
#	Line 525 \| Line 1045 \| static bool sigsegv_do_install_handler(i
1045		{
1046		// Setup SIGSEGV handler to process writes to frame buffer
1047		#ifdef HAVE_SIGACTION
1048	<	struct sigaction vosf_sa;
1049	<	sigemptyset(&vosf_sa.sa_mask);
1050	<	vosf_sa.sa_sigaction = sigsegv_handler;
1051	<	vosf_sa.sa_flags = SA_SIGINFO;
1052	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1048	>	struct sigaction sigsegv_sa;
1049	>	sigemptyset(&sigsegv_sa.sa_mask);
1050	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1051	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1052	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1053		#else
1054		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1055		#endif
#	Line 541 \| Line 1061 \| static bool sigsegv_do_install_handler(i
1061		{
1062		// Setup SIGSEGV handler to process writes to frame buffer
1063		#ifdef HAVE_SIGACTION
1064	<	struct sigaction vosf_sa;
1065	<	sigemptyset(&vosf_sa.sa_mask);
1066	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1064	>	struct sigaction sigsegv_sa;
1065	>	sigemptyset(&sigsegv_sa.sa_mask);
1066	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1067	>	sigsegv_sa.sa_flags = 0;
1068		#if !EMULATED_68K && defined(__NetBSD__)
1069	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1070	<	vosf_sa.sa_flags = SA_ONSTACK;
550	<	#else
551	<	vosf_sa.sa_flags = 0;
1069	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1070	>	sigsegv_sa.sa_flags \|= SA_ONSTACK;
1071		#endif
1072	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1072	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1073		#else
1074		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1075		#endif
1076		}
1077		#endif
1078
1079	<	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1079	>	#if defined(HAVE_MACH_EXCEPTIONS)
1080	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1081		{
1082	<	#ifdef HAVE_SIGSEGV_RECOVERY
1082	>	/*
1083	>	* Except for the exception port functions, this should be
1084	>	* pretty much stock Mach. If later you choose to support
1085	>	* other Mach's besides Darwin, just check for __MACH__
1086	>	* here and __APPLE__ where the actual differences are.
1087	>	*/
1088	>	#if defined(__APPLE__) && defined(__MACH__)
1089	>	if (sigsegv_fault_handler != NULL) {
1090	>	sigsegv_fault_handler = handler;
1091	>	return true;
1092	>	}
1093	>
1094	>	kern_return_t krc;
1095	>
1096	>	// create the the exception port
1097	>	krc = mach_port_allocate(mach_task_self(),
1098	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1099	>	if (krc != KERN_SUCCESS) {
1100	>	mach_error("mach_port_allocate", krc);
1101	>	return false;
1102	>	}
1103	>
1104	>	// add a port send right
1105	>	krc = mach_port_insert_right(mach_task_self(),
1106	>	_exceptionPort, _exceptionPort,
1107	>	MACH_MSG_TYPE_MAKE_SEND);
1108	>	if (krc != KERN_SUCCESS) {
1109	>	mach_error("mach_port_insert_right", krc);
1110	>	return false;
1111	>	}
1112	>
1113	>	// get the old exception ports
1114	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1115	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1116	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1117	>	if (krc != KERN_SUCCESS) {
1118	>	mach_error("thread_get_exception_ports", krc);
1119	>	return false;
1120	>	}
1121	>
1122	>	// set the new exception port
1123	>	//
1124	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1125	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1126	>	// message, but it turns out that in the common case this is not
1127	>	// neccessary. If we need it we can later ask for it from the
1128	>	// suspended thread.
1129	>	//
1130	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1131	>	// counter in the thread state. The comments in the header file
1132	>	// seem to imply that you can count on the GPR's on an exception
1133	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1134	>	// you have to ask for all of the GPR's anyway just to get the
1135	>	// program counter. In any case because of update effective
1136	>	// address from immediate and update address from effective
1137	>	// addresses of ra and rb modes (as good an name as any for these
1138	>	// addressing modes) used in PPC instructions, you will need the
1139	>	// GPR state anyway.
1140	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1141	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1142	>	if (krc != KERN_SUCCESS) {
1143	>	mach_error("thread_set_exception_ports", krc);
1144	>	return false;
1145	>	}
1146	>
1147	>	// create the exception handler thread
1148	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1149	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1150	>	return false;
1151	>	}
1152	>
1153	>	// do not care about the exception thread any longer, let is run standalone
1154	>	(void)pthread_detach(exc_thread);
1155	>
1156		sigsegv_fault_handler = handler;
1157	+	return true;
1158	+	#else
1159	+	return false;
1160	+	#endif
1161	+	}
1162	+	#endif
1163	+
1164	+	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1165	+	{
1166	+	#if defined(HAVE_SIGSEGV_RECOVERY)
1167		bool success = true;
1168		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1169		SIGSEGV_ALL_SIGNALS
1170		#undef FAULT_HANDLER
1171	+	if (success)
1172	+	sigsegv_fault_handler = handler;
1173		return success;
1174	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1175	+	return sigsegv_do_install_handler(handler);
1176		#else
1177		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1178		return false;
#	Line 579 \| Line 1186 \| bool sigsegv_install_handler(sigsegv_fau
1186
1187		void sigsegv_deinstall_handler(void)
1188		{
1189	+	// We do nothing for Mach exceptions, the thread would need to be
1190	+	// suspended if not already so, and we might mess with other
1191	+	// exception handlers that came after we registered ours. There is
1192	+	// no need to remove the exception handler, in fact this function is
1193	+	// not called anywhere in Basilisk II.
1194		#ifdef HAVE_SIGSEGV_RECOVERY
1195		sigsegv_fault_handler = 0;
1196		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
#	Line 589 \| Line 1201 \| void sigsegv_deinstall_handler(void)
1201
1202
1203		/*
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	–	/*
1204		* Set callback function when we cannot handle the fault
1205		*/
1206
#	Line 619 \| Line 1221 \| void sigsegv_set_dump_state(sigsegv_stat
1221		#include <sys/mman.h>
1222		#include "vm_alloc.h"
1223
1224	+	const int REF_INDEX = 123;
1225	+	const int REF_VALUE = 45;
1226	+
1227		static int page_size;
1228		static volatile char * page = 0;
1229		static volatile int handler_called = 0;
1230
1231	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1231	>	#ifdef __GNUC__
1232	>	// Code range where we expect the fault to come from
1233	>	static void b_region, e_region;
1234	>	#endif
1235	>
1236	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1237		{
1238		handler_called++;
1239	<	if ((fault_address - 123) != page)
1240	<	exit(1);
1239	>	if ((fault_address - REF_INDEX) != page)
1240	>	exit(10);
1241	>	#ifdef __GNUC__
1242	>	// Make sure reported fault instruction address falls into
1243	>	// expected code range
1244	>	if (instruction_address != SIGSEGV_INVALID_PC
1245	>	&& ((instruction_address < (sigsegv_address_t)b_region) \|\|
1246	>	(instruction_address >= (sigsegv_address_t)e_region)))
1247	>	exit(11);
1248	>	#endif
1249		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ \| VM_PAGE_WRITE) != 0)
1250	<	exit(1);
1251	<	return true;
1250	>	exit(12);
1251	>	return SIGSEGV_RETURN_SUCCESS;
1252		}
1253
1254		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1255	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1255	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1256		{
1257	<	return false;
1257	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1258	>	#ifdef __GNUC__
1259	>	// Make sure reported fault instruction address falls into
1260	>	// expected code range
1261	>	if (instruction_address != SIGSEGV_INVALID_PC
1262	>	&& ((instruction_address < (sigsegv_address_t)b_region) \|\|
1263	>	(instruction_address >= (sigsegv_address_t)e_region)))
1264	>	return SIGSEGV_RETURN_FAILURE;
1265	>	#endif
1266	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1267	>	}
1268	>
1269	>	return SIGSEGV_RETURN_FAILURE;
1270		}
1271		#endif
1272
#	Line 647 \| Line 1277 \| int main(void)
1277
1278		page_size = getpagesize();
1279		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1280	<	return 1;
1280	>	return 2;
1281
1282	+	memset((void *)page, 0, page_size);
1283		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1284	<	return 1;
1284	>	return 3;
1285
1286		if (!sigsegv_install_handler(sigsegv_test_handler))
1287	<	return 1;
657	<
658	<	page[123] = 45;
659	<	page[123] = 45;
1287	>	return 4;
1288
1289	+	#ifdef __GNUC__
1290	+	b_region = &&L_b_region1;
1291	+	e_region = &&L_e_region1;
1292	+	#endif
1293	+	L_b_region1:
1294	+	page[REF_INDEX] = REF_VALUE;
1295	+	if (page[REF_INDEX] != REF_VALUE)
1296	+	exit(20);
1297	+	page[REF_INDEX] = REF_VALUE;
1298	+	L_e_region1:
1299	+
1300		if (handler_called != 1)
1301	<	return 1;
1301	>	return 5;
1302
1303		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1304		if (!sigsegv_install_handler(sigsegv_insn_handler))
1305	<	return 1;
1305	>	return 6;
1306
1307	<	if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0)
1308	<	return 1;
1307	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ \| VM_PAGE_WRITE) < 0)
1308	>	return 7;
1309
1310		for (int i = 0; i < page_size; i++)
1311		page[i] = (i + 1) % page_size;
1312
1313		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1314	<	return 1;
1314	>	return 8;
1315
677	–	sigsegv_set_ignore_state(true);
678	–
1316		#define TEST_SKIP_INSTRUCTION(TYPE) do { \
1317		const unsigned int TAG = 0x12345678; \
1318		TYPE data = ((TYPE )(page + sizeof(TYPE))); \
1319		volatile unsigned int effect = data + TAG; \
1320		if (effect != TAG) \
1321	<	return 1; \
1321	>	return 9; \
1322		} while (0)
1323
1324	+	#ifdef __GNUC__
1325	+	b_region = &&L_b_region2;
1326	+	e_region = &&L_e_region2;
1327	+	#endif
1328	+	L_b_region2:
1329		TEST_SKIP_INSTRUCTION(unsigned char);
1330		TEST_SKIP_INSTRUCTION(unsigned short);
1331		TEST_SKIP_INSTRUCTION(unsigned int);
1332	+	L_e_region2:
1333		#endif
1334
1335		vm_exit();
1336		return 0;
1337		}
1338		#endif
1339	+
1340	+
1341	+
1342	+
1343	+
1344	+
1345	+
1346	+
1347	+
1348	+
1349	+
1350	+
1351	+
1352	+
1353	+

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+Removed lines
-+
+Added lines
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+Changed lines
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+Changed lines

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents): Revision 1.12 by gbeauche, 2002-05-16T15:48:06Z vs. Revision 1.33 by gbeauche, 2003-10-21T23:10:19Z

Diff Legend

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.12 by gbeauche, 2002-05-16T15:48:06Z vs.
Revision 1.33 by gbeauche, 2003-10-21T23:10:19Z