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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.7 by cebix, 2002-01-15T14:58:37Z vs.
Revision 1.37 by gbeauche, 2003-12-20T07:43:56Z

#	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 41 | Line 52
52		typedef RETSIGTYPE (*signal_handler)(int);
53
54		// User's SIGSEGV handler
55	<	static sigsegv_handler_t sigsegv_user_handler = 0;
55	>	static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
56	>
57	>	// Function called to dump state if we can't handle the fault
58	>	static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
59
60		// Actual SIGSEGV handler installer
61		static bool sigsegv_do_install_handler(int sig);
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, // 2 bytes
73	+	SIZE_LONG, // 4 bytes
74	+	SIZE_QUAD, // 8 bytes
75	+	};
76	+
77	+	// Transfer type
78	+	typedef sigsegv_transfer_type_t transfer_type_t;
79	+
80	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
81	+	// Addressing mode
82	+	enum addressing_mode_t {
83	+	MODE_UNKNOWN,
84	+	MODE_NORM,
85	+	MODE_U,
86	+	MODE_X,
87	+	MODE_UX
88	+	};
89	+
90	+	// Decoded instruction
91	+	struct instruction_t {
92	+	transfer_type_t         transfer_type;
93	+	transfer_size_t         transfer_size;
94	+	addressing_mode_t       addr_mode;
95	+	unsigned int            addr;
96	+	char                            ra, rd;
97	+	};
98	+
99	+	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned int * gpr)
100	+	{
101	+	// Get opcode and divide into fields
102	+	unsigned int opcode = *((unsigned int *)nip);
103	+	unsigned int primop = opcode >> 26;
104	+	unsigned int exop = (opcode >> 1) & 0x3ff;
105	+	unsigned int ra = (opcode >> 16) & 0x1f;
106	+	unsigned int rb = (opcode >> 11) & 0x1f;
107	+	unsigned int rd = (opcode >> 21) & 0x1f;
108	+	signed int imm = (signed short)(opcode & 0xffff);
109	+
110	+	// Analyze opcode
111	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
112	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
113	+	addressing_mode_t addr_mode = MODE_UNKNOWN;
114	+	switch (primop) {
115	+	case 31:
116	+	switch (exop) {
117	+	case 23:        // lwzx
118	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
119	+	case 55:        // lwzux
120	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
121	+	case 87:        // lbzx
122	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
123	+	case 119:       // lbzux
124	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
125	+	case 151:       // stwx
126	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
127	+	case 183:       // stwux
128	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
129	+	case 215:       // stbx
130	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
131	+	case 247:       // stbux
132	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
133	+	case 279:       // lhzx
134	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
135	+	case 311:       // lhzux
136	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
137	+	case 343:       // lhax
138	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
139	+	case 375:       // lhaux
140	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
141	+	case 407:       // sthx
142	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
143	+	case 439:       // sthux
144	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
145	+	}
146	+	break;
147	+
148	+	case 32:        // lwz
149	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
150	+	case 33:        // lwzu
151	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
152	+	case 34:        // lbz
153	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
154	+	case 35:        // lbzu
155	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
156	+	case 36:        // stw
157	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
158	+	case 37:        // stwu
159	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
160	+	case 38:        // stb
161	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
162	+	case 39:        // stbu
163	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
164	+	case 40:        // lhz
165	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
166	+	case 41:        // lhzu
167	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
168	+	case 42:        // lha
169	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
170	+	case 43:        // lhau
171	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
172	+	case 44:        // sth
173	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
174	+	case 45:        // sthu
175	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
176	+	}
177	+
178	+	// Calculate effective address
179	+	unsigned int addr = 0;
180	+	switch (addr_mode) {
181	+	case MODE_X:
182	+	case MODE_UX:
183	+	if (ra == 0)
184	+	addr = gpr[rb];
185	+	else
186	+	addr = gpr[ra] + gpr[rb];
187	+	break;
188	+	case MODE_NORM:
189	+	case MODE_U:
190	+	if (ra == 0)
191	+	addr = (signed int)(signed short)imm;
192	+	else
193	+	addr = gpr[ra] + (signed int)(signed short)imm;
194	+	break;
195	+	default:
196	+	break;
197	+	}
198	+
199	+	// Commit decoded instruction
200	+	instruction->addr = addr;
201	+	instruction->addr_mode = addr_mode;
202	+	instruction->transfer_type = transfer_type;
203	+	instruction->transfer_size = transfer_size;
204	+	instruction->ra = ra;
205	+	instruction->rd = rd;
206	+	}
207	+	#endif
208	+
209	+
210	+	/*
211		*  OS-dependant SIGSEGV signals support section
212		*/
213
214		#if HAVE_SIGINFO_T
215		// Generic extended signal handler
216	+	#if defined(__NetBSD__) || defined(__FreeBSD__)
217	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
218	+	#else
219		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
220	+	#endif
221		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
222	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t *sip, void *scp
223	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sip, scp
224		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
225	+	#if (defined(sgi) || defined(__sgi))
226	+	#include <ucontext.h>
227	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
228	+	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)SIGSEGV_CONTEXT_REGS[CTX_EPC]
229	+	#endif
230	+	#if defined(__sun__)
231	+	#if (defined(sparc) || defined(__sparc__))
232	+	#include <sys/ucontext.h>
233	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
234	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[REG_PC]
235	+	#endif
236	+	#endif
237	+	#if defined(__FreeBSD__)
238	+	#if (defined(i386) || defined(__i386__))
239	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
240	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
241	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
242	+	#endif
243	+	#endif
244		#if defined(__linux__)
245		#if (defined(i386) || defined(__i386__))
246		#include <sys/ucontext.h>
247	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
247	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
248	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
249	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
250	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
251	>	#endif
252	>	#if (defined(x86_64) || defined(__x86_64__))
253	>	#include <sys/ucontext.h>
254	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
255	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
256	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
257	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
258		#endif
259		#if (defined(ia64) || defined(__ia64__))
260		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
261		#endif
262	+	#if (defined(powerpc) || defined(__powerpc__))
263	+	#include <sys/ucontext.h>
264	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
265	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
266	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
267	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
268	+	#endif
269		#endif
270		#endif
271
#	Line 74 | Line 276 | static bool sigsegv_do_install_handler(i
276		#if (defined(i386) || defined(__i386__))
277		#include <asm/sigcontext.h>
278		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
279	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
280	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
279	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
280	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
281	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
282	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
283	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
284	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
285		#endif
286		#if (defined(sparc) || defined(__sparc__))
287		#include <asm/sigcontext.h>
288		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
289	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
290		#define SIGSEGV_FAULT_ADDRESS                   addr
291		#endif
292		#if (defined(powerpc) || defined(__powerpc__))
293		#include <asm/sigcontext.h>
294		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
295	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
296		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
297		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
298	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
299	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
300		#endif
301		#if (defined(alpha) || defined(__alpha__))
302		#include <asm/sigcontext.h>
303		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
304	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
305		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
306		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
96	–
97	–	// From Boehm's GC 6.0alpha8
98	–	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
99	–	{
100	–	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
101	–	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
102	–	fault_address += (signed long)(signed short)(instruction & 0xffff);
103	–	return (sigsegv_address_t)fault_address;
104	–	}
307		#endif
308		#endif
309
310		// Irix 5 or 6 on MIPS
311	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
311	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
312	>	#include <ucontext.h>
313		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
314	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
314	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
315	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
316	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
317		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
318		#endif
319
320	+	// HP-UX
321	+	#if (defined(hpux) || defined(__hpux__))
322	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
323	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
324	+	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
325	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
326	+	#endif
327	+
328		// OSF/1 on Alpha
329		#if defined(__osf__)
330	+	#include <ucontext.h>
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_traparg_a0
334		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
335		#endif
#	Line 122 | Line 337 | static sigsegv_address_t get_fault_addre
337		// AIX
338		#if defined(_AIX)
339		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
340	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
341		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
342		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
343		#endif
344
345	<	// NetBSD or FreeBSD
346	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
345	>	// NetBSD
346	>	#if defined(__NetBSD__)
347		#if (defined(m68k) || defined(__m68k__))
348		#include <m68k/frame.h>
349		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
350	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
351	<	struct sigstate {                                                                                                                                                                       \
136	<	int ss_flags;                                                                                                                                                                   \
137	<	struct frame ss_frame;                                                                                                                                                  \
138	<	};                                                                                                                                                                                                      \
139	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
140	<	char *fault_addr;                                                                                                                                                                       \
141	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
142	<	case 7:         /* 68040 access error */                                                                                                                                \
143	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
144	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
145	<	break;                                                                                                                                                                                  \
146	<	default:                                                                                                                                                                                        \
147	<	fault_addr = (char *)code;                                                                                                                                              \
148	<	break;                                                                                                                                                                                  \
149	<	}                                                                                                                                                                                                       \
150	<	fault_addr;                                                                                                                                                                                     \
151	<	})
350	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
351	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
352		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
353	<	#else
354	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
355	<	#define SIGSEGV_FAULT_ADDRESS                   addr
353	>
354	>	// Use decoding scheme from BasiliskII/m68k native
355	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
356	>	{
357	>	struct sigstate {
358	>	int ss_flags;
359	>	struct frame ss_frame;
360	>	};
361	>	struct sigstate *state = (struct sigstate *)scp->sc_ap;
362	>	char *fault_addr;
363	>	switch (state->ss_frame.f_format) {
364	>	case 7:         /* 68040 access error */
365	>	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
366	>	fault_addr = state->ss_frame.f_fmt7.f_fa;
367	>	break;
368	>	default:
369	>	fault_addr = (char *)code;
370	>	break;
371	>	}
372	>	return (sigsegv_address_t)fault_addr;
373	>	}
374	>	#endif
375	>	#if (defined(alpha) || defined(__alpha__))
376	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
377	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
378	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
379		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
380		#endif
381	+	#if (defined(i386) || defined(__i386__))
382	+	#error "FIXME: need to decode instruction and compute EA"
383	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
384	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
385	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
386	+	#endif
387	+	#endif
388	+	#if defined(__FreeBSD__)
389	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
390	+	#if (defined(i386) || defined(__i386__))
391	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
392	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
393	+	#define SIGSEGV_FAULT_ADDRESS                   addr
394	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
395	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
396	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
397	+	#endif
398		#endif
399
400	<	// MacOS X
400	>	// Extract fault address out of a sigcontext
401	>	#if (defined(alpha) || defined(__alpha__))
402	>	// From Boehm's GC 6.0alpha8
403	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
404	>	{
405	>	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
406	>	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
407	>	fault_address += (signed long)(signed short)(instruction & 0xffff);
408	>	return (sigsegv_address_t)fault_address;
409	>	}
410	>	#endif
411	>
412	>
413	>	// MacOS X, not sure which version this works in. Under 10.1
414	>	// vm_protect does not appear to work from a signal handler. Under
415	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
416	>	// field is the address of the faulting instruction and not the
417	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
418	>	// case with Mach exception handlers there is a way to do what this
419	>	// was meant to do.
420	>	#ifndef HAVE_MACH_EXCEPTIONS
421		#if defined(__APPLE__) && defined(__MACH__)
422		#if (defined(ppc) || defined(__ppc__))
423		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
424	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
425		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
426		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
427		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
428	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
429	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
430
431	<	// From Boehm's GC 6.0alpha8
169	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
170	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
171	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
172	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
173	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
174	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
175	<
431	>	// Use decoding scheme from SheepShaver
432		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
433		{
434	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
435	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
436	<	int            disp = 0, tmp;
437	<	unsigned int   baseA = 0, baseB = 0;
438	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
439	<
440	<	switch(EXTRACT_OP1(instr)) {
441	<	case 38:   /* stb */
442	<	case 39:   /* stbu */
443	<	case 54:   /* stfd */
444	<	case 55:   /* stfdu */
445	<	case 52:   /* stfs */
446	<	case 53:   /* stfsu */
447	<	case 44:   /* sth */
448	<	case 45:   /* sthu */
449	<	case 47:   /* stmw */
450	<	case 36:   /* stw */
451	<	case 37:   /* stwu */
452	<	tmp = EXTRACT_REGA(instr);
453	<	if(tmp > 0)
454	<	baseA = regs[tmp];
455	<	disp = EXTRACT_DISP(instr);
434	>	unsigned int   nip = (unsigned int) scp->sc_ir;
435	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
436	>	instruction_t  instr;
437	>
438	>	powerpc_decode_instruction(&instr, nip, gpr);
439	>	return (sigsegv_address_t)instr.addr;
440	>	}
441	>	#endif
442	>	#endif
443	>	#endif
444	>	#endif
445	>
446	>	#if HAVE_MACH_EXCEPTIONS
447	>
448	>	// This can easily be extended to other Mach systems, but really who
449	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
450	>	// Mach 2.5/3.0?
451	>	#if defined(__APPLE__) && defined(__MACH__)
452	>
453	>	#include <sys/types.h>
454	>	#include <stdlib.h>
455	>	#include <stdio.h>
456	>	#include <pthread.h>
457	>
458	>	/*
459	>	* If you are familiar with MIG then you will understand the frustration
460	>	* that was necessary to get these embedded into C++ code by hand.
461	>	*/
462	>	extern "C" {
463	>	#include <mach/mach.h>
464	>	#include <mach/mach_error.h>
465	>
466	>	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
467	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
468	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
469	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
470	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
471	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
472	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
473	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
474	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
475	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
476	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
477	>	}
478	>
479	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
480	>	#define HANDLER_COUNT 64
481	>
482	>	// structure to tuck away existing exception handlers
483	>	typedef struct _ExceptionPorts {
484	>	mach_msg_type_number_t maskCount;
485	>	exception_mask_t masks[HANDLER_COUNT];
486	>	exception_handler_t handlers[HANDLER_COUNT];
487	>	exception_behavior_t behaviors[HANDLER_COUNT];
488	>	thread_state_flavor_t flavors[HANDLER_COUNT];
489	>	} ExceptionPorts;
490	>
491	>	// exception handler thread
492	>	static pthread_t exc_thread;
493	>
494	>	// place where old exception handler info is stored
495	>	static ExceptionPorts ports;
496	>
497	>	// our exception port
498	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
499	>
500	>	#define MACH_CHECK_ERROR(name,ret) \
501	>	if (ret != KERN_SUCCESS) { \
502	>	mach_error(#name, ret); \
503	>	exit (1); \
504	>	}
505	>
506	>	#define SIGSEGV_FAULT_ADDRESS                   code[1]
507	>	#define SIGSEGV_FAULT_INSTRUCTION               get_fault_instruction(thread, state)
508	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
509	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
510	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
511	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
512	>	#define SIGSEGV_REGISTER_FILE                   &state->srr0, &state->r0
513	>
514	>	// Given a suspended thread, stuff the current instruction and
515	>	// registers into state.
516	>	//
517	>	// It would have been nice to have this be ppc/x86 independant which
518	>	// could have been done easily with a thread_state_t instead of
519	>	// ppc_thread_state_t, but because of the way this is called it is
520	>	// easier to do it this way.
521	>	#if (defined(ppc) || defined(__ppc__))
522	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
523	>	{
524	>	kern_return_t krc;
525	>	mach_msg_type_number_t count;
526	>
527	>	count = MACHINE_THREAD_STATE_COUNT;
528	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
529	>	MACH_CHECK_ERROR (thread_get_state, krc);
530	>
531	>	return (sigsegv_address_t)state->srr0;
532	>	}
533	>	#endif
534	>
535	>	// Since there can only be one exception thread running at any time
536	>	// this is not a problem.
537	>	#define MSG_SIZE 512
538	>	static char msgbuf[MSG_SIZE];
539	>	static char replybuf[MSG_SIZE];
540	>
541	>	/*
542	>	* This is the entry point for the exception handler thread. The job
543	>	* of this thread is to wait for exception messages on the exception
544	>	* port that was setup beforehand and to pass them on to exc_server.
545	>	* exc_server is a MIG generated function that is a part of Mach.
546	>	* Its job is to decide what to do with the exception message. In our
547	>	* case exc_server calls catch_exception_raise on our behalf. After
548	>	* exc_server returns, it is our responsibility to send the reply.
549	>	*/
550	>	static void *
551	>	handleExceptions(void *priv)
552	>	{
553	>	mach_msg_header_t *msg, *reply;
554	>	kern_return_t krc;
555	>
556	>	msg = (mach_msg_header_t *)msgbuf;
557	>	reply = (mach_msg_header_t *)replybuf;
558	>
559	>	for (;;) {
560	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
561	>	_exceptionPort, 0, MACH_PORT_NULL);
562	>	MACH_CHECK_ERROR(mach_msg, krc);
563	>
564	>	if (!exc_server(msg, reply)) {
565	>	fprintf(stderr, "exc_server hated the message\n");
566	>	exit(1);
567	>	}
568	>
569	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
570	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
571	>	if (krc != KERN_SUCCESS) {
572	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
573	>	krc, mach_error_string(krc));
574	>	exit(1);
575	>	}
576	>	}
577	>	}
578	>	#endif
579	>	#endif
580	>
581	>
582	>	/*
583	>	*  Instruction skipping
584	>	*/
585	>
586	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
587	>	// Decode and skip X86 instruction
588	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
589	>	#if defined(__linux__)
590	>	enum {
591	>	#if (defined(i386) || defined(__i386__))
592	>	X86_REG_EIP = 14,
593	>	X86_REG_EAX = 11,
594	>	X86_REG_ECX = 10,
595	>	X86_REG_EDX = 9,
596	>	X86_REG_EBX = 8,
597	>	X86_REG_ESP = 7,
598	>	X86_REG_EBP = 6,
599	>	X86_REG_ESI = 5,
600	>	X86_REG_EDI = 4
601	>	#endif
602	>	#if defined(__x86_64__)
603	>	X86_REG_R8  = 0,
604	>	X86_REG_R9  = 1,
605	>	X86_REG_R10 = 2,
606	>	X86_REG_R11 = 3,
607	>	X86_REG_R12 = 4,
608	>	X86_REG_R13 = 5,
609	>	X86_REG_R14 = 6,
610	>	X86_REG_R15 = 7,
611	>	X86_REG_EDI = 8,
612	>	X86_REG_ESI = 9,
613	>	X86_REG_EBP = 10,
614	>	X86_REG_EBX = 11,
615	>	X86_REG_EDX = 12,
616	>	X86_REG_EAX = 13,
617	>	X86_REG_ECX = 14,
618	>	X86_REG_ESP = 15,
619	>	X86_REG_EIP = 16
620	>	#endif
621	>	};
622	>	#endif
623	>	#if defined(__NetBSD__) || defined(__FreeBSD__)
624	>	enum {
625	>	#if (defined(i386) || defined(__i386__))
626	>	X86_REG_EIP = 10,
627	>	X86_REG_EAX = 7,
628	>	X86_REG_ECX = 6,
629	>	X86_REG_EDX = 5,
630	>	X86_REG_EBX = 4,
631	>	X86_REG_ESP = 13,
632	>	X86_REG_EBP = 2,
633	>	X86_REG_ESI = 1,
634	>	X86_REG_EDI = 0
635	>	#endif
636	>	};
637	>	#endif
638	>	// FIXME: this is partly redundant with the instruction decoding phase
639	>	// to discover transfer type and register number
640	>	static inline int ix86_step_over_modrm(unsigned char * p)
641	>	{
642	>	int mod = (p[0] >> 6) & 3;
643	>	int rm = p[0] & 7;
644	>	int offset = 0;
645	>
646	>	// ModR/M Byte
647	>	switch (mod) {
648	>	case 0: // [reg]
649	>	if (rm == 5) return 4; // disp32
650		break;
651	<	case 31:
652	<	switch(EXTRACT_OP2(instr)) {
653	<	case 86:    /* dcbf */
654	<	case 54:    /* dcbst */
655	<	case 1014:  /* dcbz */
656	<	case 247:   /* stbux */
657	<	case 215:   /* stbx */
658	<	case 759:   /* stfdux */
659	<	case 727:   /* stfdx */
660	<	case 983:   /* stfiwx */
661	<	case 695:   /* stfsux */
662	<	case 663:   /* stfsx */
663	<	case 918:   /* sthbrx */
664	<	case 439:   /* sthux */
665	<	case 407:   /* sthx */
666	<	case 661:   /* stswx */
667	<	case 662:   /* stwbrx */
668	<	case 150:   /* stwcx. */
669	<	case 183:   /* stwux */
670	<	case 151:   /* stwx */
671	<	case 135:   /* stvebx */
672	<	case 167:   /* stvehx */
673	<	case 199:   /* stvewx */
674	<	case 231:   /* stvx */
675	<	case 487:   /* stvxl */
676	<	tmp = EXTRACT_REGA(instr);
677	<	if(tmp > 0)
678	<	baseA = regs[tmp];
679	<	baseB = regs[EXTRACT_REGC(instr)];
680	<	/* determine Altivec alignment mask */
681	<	switch(EXTRACT_OP2(instr)) {
682	<	case 167:   /* stvehx */
683	<	alignmask = 0xFFFFFFFE;
684	<	break;
685	<	case 199:   /* stvewx */
686	<	alignmask = 0xFFFFFFFC;
687	<	break;
688	<	case 231:   /* stvx */
689	<	alignmask = 0xFFFFFFF0;
690	<	break;
691	<	case 487:  /* stvxl */
692	<	alignmask = 0xFFFFFFF0;
693	<	break;
694	<	}
651	>	case 1: // disp8[reg]
652	>	offset = 1;
653	>	break;
654	>	case 2: // disp32[reg]
655	>	offset = 4;
656	>	break;
657	>	case 3: // register
658	>	return 0;
659	>	}
660	>
661	>	// SIB Byte
662	>	if (rm == 4) {
663	>	if (mod == 0 && (p[1] & 7) == 5)
664	>	offset = 5; // disp32[index]
665	>	else
666	>	offset++;
667	>	}
668	>
669	>	return offset;
670	>	}
671	>
672	>	static bool ix86_skip_instruction(unsigned long * regs)
673	>	{
674	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
675	>
676	>	if (eip == 0)
677	>	return false;
678	>
679	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
680	>	transfer_size_t transfer_size = SIZE_LONG;
681	>
682	>	int reg = -1;
683	>	int len = 0;
684	>
685	>	#if DEBUG
686	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
687	>	eip, eip[0], eip[1], eip[2], eip[3]);
688	>	#endif
689	>
690	>	// Operand size prefix
691	>	if (*eip == 0x66) {
692	>	eip++;
693	>	len++;
694	>	transfer_size = SIZE_WORD;
695	>	}
696	>
697	>	// REX prefix
698	>	#if defined(__x86_64__)
699	>	struct rex_t {
700	>	unsigned char W;
701	>	unsigned char R;
702	>	unsigned char X;
703	>	unsigned char B;
704	>	};
705	>	rex_t rex = { 0, 0, 0, 0 };
706	>	bool has_rex = false;
707	>	if ((*eip & 0xf0) == 0x40) {
708	>	has_rex = true;
709	>	const unsigned char b = *eip;
710	>	rex.W = b & (1 << 3);
711	>	rex.R = b & (1 << 2);
712	>	rex.X = b & (1 << 1);
713	>	rex.B = b & (1 << 0);
714	>	#if DEBUG
715	>	printf("REX: %c,%c,%c,%c\n",
716	>	rex.W ? 'W' : '_',
717	>	rex.R ? 'R' : '_',
718	>	rex.X ? 'X' : '_',
719	>	rex.B ? 'B' : '_');
720	>	#endif
721	>	eip++;
722	>	len++;
723	>	if (rex.W)
724	>	transfer_size = SIZE_QUAD;
725	>	}
726	>	#else
727	>	const bool has_rex = false;
728	>	#endif
729	>
730	>	// Decode instruction
731	>	switch (eip[0]) {
732	>	case 0x0f:
733	>	switch (eip[1]) {
734	>	case 0xb6: // MOVZX r32, r/m8
735	>	case 0xb7: // MOVZX r32, r/m16
736	>	switch (eip[2] & 0xc0) {
737	>	case 0x80:
738	>	reg = (eip[2] >> 3) & 7;
739	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
740	>	break;
741	>	case 0x40:
742	>	reg = (eip[2] >> 3) & 7;
743	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
744	>	break;
745	>	case 0x00:
746	>	reg = (eip[2] >> 3) & 7;
747	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
748	>	break;
749	>	}
750	>	len += 3 + ix86_step_over_modrm(eip + 2);
751	>	break;
752	>	}
753	>	break;
754	>	case 0x8a: // MOV r8, r/m8
755	>	transfer_size = SIZE_BYTE;
756	>	case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
757	>	switch (eip[1] & 0xc0) {
758	>	case 0x80:
759	>	reg = (eip[1] >> 3) & 7;
760	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
761		break;
762	<	case 725:   /* stswi */
763	<	tmp = EXTRACT_REGA(instr);
764	<	if(tmp > 0)
249	<	baseA = regs[tmp];
762	>	case 0x40:
763	>	reg = (eip[1] >> 3) & 7;
764	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
765		break;
766	<	default:   /* ignore instruction */
767	<	return 0;
766	>	case 0x00:
767	>	reg = (eip[1] >> 3) & 7;
768	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
769		break;
770		}
771	+	len += 2 + ix86_step_over_modrm(eip + 1);
772		break;
773	<	default:   /* ignore instruction */
774	<	return 0;
773	>	case 0x88: // MOV r/m8, r8
774	>	transfer_size = SIZE_BYTE;
775	>	case 0x89: // MOV r/m32, r32 (or 16-bit operation)
776	>	switch (eip[1] & 0xc0) {
777	>	case 0x80:
778	>	reg = (eip[1] >> 3) & 7;
779	>	transfer_type = SIGSEGV_TRANSFER_STORE;
780	>	break;
781	>	case 0x40:
782	>	reg = (eip[1] >> 3) & 7;
783	>	transfer_type = SIGSEGV_TRANSFER_STORE;
784	>	break;
785	>	case 0x00:
786	>	reg = (eip[1] >> 3) & 7;
787	>	transfer_type = SIGSEGV_TRANSFER_STORE;
788	>	break;
789	>	}
790	>	len += 2 + ix86_step_over_modrm(eip + 1);
791		break;
792		}
793	+
794	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
795	+	// Unknown machine code, let it crash. Then patch the decoder
796	+	return false;
797	+	}
798	+
799	+	#if defined(__x86_64__)
800	+	if (rex.R)
801	+	reg += 8;
802	+	#endif
803	+
804	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
805	+	static const int x86_reg_map[] = {
806	+	X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
807	+	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
808	+	#if defined(__x86_64__)
809	+	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
810	+	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
811	+	#endif
812	+	};
813	+
814	+	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
815	+	return false;
816	+
817	+	// Set 0 to the relevant register part
818	+	// NOTE: this is only valid for MOV alike instructions
819	+	int rloc = x86_reg_map[reg];
820	+	switch (transfer_size) {
821	+	case SIZE_BYTE:
822	+	if (has_rex || reg < 4)
823	+	regs[rloc] = (regs[rloc] & ~0x00ffL);
824	+	else {
825	+	rloc = x86_reg_map[reg - 4];
826	+	regs[rloc] = (regs[rloc] & ~0xff00L);
827	+	}
828	+	break;
829	+	case SIZE_WORD:
830	+	regs[rloc] = (regs[rloc] & ~0xffffL);
831	+	break;
832	+	case SIZE_LONG:
833	+	case SIZE_QUAD: // zero-extension
834	+	regs[rloc] = 0;
835	+	break;
836	+	}
837	+	}
838	+
839	+	#if DEBUG
840	+	printf("%08x: %s %s access", regs[X86_REG_EIP],
841	+	transfer_size == SIZE_BYTE ? "byte" :
842	+	transfer_size == SIZE_WORD ? "word" :
843	+	transfer_size == SIZE_LONG ? "long" :
844	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
845	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
846
847	<	addr = (baseA + baseB) + disp;
848	<	addr &= alignmask;
849	<	return (sigsegv_address_t)addr;
847	>	if (reg != -1) {
848	>	static const char * x86_byte_reg_str_map[] = {
849	>	"al",   "cl",   "dl",   "bl",
850	>	"spl",  "bpl",  "sil",  "dil",
851	>	"r8b",  "r9b",  "r10b", "r11b",
852	>	"r12b", "r13b", "r14b", "r15b",
853	>	"ah",   "ch",   "dh",   "bh",
854	>	};
855	>	static const char * x86_word_reg_str_map[] = {
856	>	"ax",   "cx",   "dx",   "bx",
857	>	"sp",   "bp",   "si",   "di",
858	>	"r8w",  "r9w",  "r10w", "r11w",
859	>	"r12w", "r13w", "r14w", "r15w",
860	>	};
861	>	static const char *x86_long_reg_str_map[] = {
862	>	"eax",  "ecx",  "edx",  "ebx",
863	>	"esp",  "ebp",  "esi",  "edi",
864	>	"r8d",  "r9d",  "r10d", "r11d",
865	>	"r12d", "r13d", "r14d", "r15d",
866	>	};
867	>	static const char *x86_quad_reg_str_map[] = {
868	>	"rax", "rcx", "rdx", "rbx",
869	>	"rsp", "rbp", "rsi", "rdi",
870	>	"r8",  "r9",  "r10", "r11",
871	>	"r12", "r13", "r14", "r15",
872	>	};
873	>	const char * reg_str = NULL;
874	>	switch (transfer_size) {
875	>	case SIZE_BYTE:
876	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
877	>	break;
878	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
879	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
880	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
881	>	}
882	>	if (reg_str)
883	>	printf(" %s register %%%s",
884	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
885	>	reg_str);
886	>	}
887	>	printf(", %d bytes instruction\n", len);
888	>	#endif
889	>
890	>	regs[X86_REG_EIP] += len;
891	>	return true;
892		}
893		#endif
894	+
895	+	// Decode and skip PPC instruction
896	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
897	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
898	+	{
899	+	instruction_t instr;
900	+	powerpc_decode_instruction(&instr, *nip_p, regs);
901	+
902	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
903	+	// Unknown machine code, let it crash. Then patch the decoder
904	+	return false;
905	+	}
906	+
907	+	#if DEBUG
908	+	printf("%08x: %s %s access", *nip_p,
909	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
910	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
911	+
912	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
913	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
914	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
915	+	printf(" r%d (rd = 0)\n", instr.rd);
916	+	#endif
917	+
918	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
919	+	regs[instr.ra] = instr.addr;
920	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
921	+	regs[instr.rd] = 0;
922	+
923	+	*nip_p += 4;
924	+	return true;
925	+	}
926		#endif
927		#endif
928
#	Line 270 | Line 930 | static sigsegv_address_t get_fault_addre
930		#ifndef SIGSEGV_FAULT_INSTRUCTION
931		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
932		#endif
933	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
934	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
935	+	#endif
936	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
937	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
938	+	#endif
939
940		// SIGSEGV recovery supported ?
941		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 281 | Line 947 | static sigsegv_address_t get_fault_addre
947		*  SIGSEGV global handler
948		*/
949
950	+	#if defined(HAVE_SIGSEGV_RECOVERY) || defined(HAVE_MACH_EXCEPTIONS)
951	+	// This function handles the badaccess to memory.
952	+	// It is called from the signal handler or the exception handler.
953	+	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
954	+	{
955	+	sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
956	+	sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
957	+
958	+	// Call user's handler and reinstall the global handler, if required
959	+	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
960	+	case SIGSEGV_RETURN_SUCCESS:
961	+	return true;
962	+
963	+	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
964	+	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
965	+	// Call the instruction skipper with the register file
966	+	// available
967	+	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
968	+	#ifdef HAVE_MACH_EXCEPTIONS
969	+	// Unlike UNIX signals where the thread state
970	+	// is modified off of the stack, in Mach we
971	+	// need to actually call thread_set_state to
972	+	// have the register values updated.
973	+	kern_return_t krc;
974	+
975	+	krc = thread_set_state(thread,
976	+	MACHINE_THREAD_STATE, (thread_state_t)state,
977	+	MACHINE_THREAD_STATE_COUNT);
978	+	MACH_CHECK_ERROR (thread_get_state, krc);
979	+	#endif
980	+	return true;
981	+	}
982	+	break;
983	+	#endif
984	+	}
985	+
986	+	// We can't do anything with the fault_address, dump state?
987	+	if (sigsegv_state_dumper != 0)
988	+	sigsegv_state_dumper(fault_address, fault_instruction);
989	+
990	+	return false;
991	+	}
992	+	#endif
993	+
994	+
995	+	/*
996	+	* There are two mechanisms for handling a bad memory access,
997	+	* Mach exceptions and UNIX signals. The implementation specific
998	+	* code appears below. Its reponsibility is to call handle_badaccess
999	+	* which is the routine that handles the fault in an implementation
1000	+	* agnostic manner. The implementation specific code below is then
1001	+	* reponsible for checking whether handle_badaccess was able
1002	+	* to handle the memory access error and perform any implementation
1003	+	* specific tasks necessary afterwards.
1004	+	*/
1005	+
1006	+	#ifdef HAVE_MACH_EXCEPTIONS
1007	+	/*
1008	+	* We need to forward all exceptions that we do not handle.
1009	+	* This is important, there are many exceptions that may be
1010	+	* handled by other exception handlers. For example debuggers
1011	+	* use exceptions and the exception hander is in another
1012	+	* process in such a case. (Timothy J. Wood states in his
1013	+	* message to the list that he based this code on that from
1014	+	* gdb for Darwin.)
1015	+	*/
1016	+	static inline kern_return_t
1017	+	forward_exception(mach_port_t thread_port,
1018	+	mach_port_t task_port,
1019	+	exception_type_t exception_type,
1020	+	exception_data_t exception_data,
1021	+	mach_msg_type_number_t data_count,
1022	+	ExceptionPorts *oldExceptionPorts)
1023	+	{
1024	+	kern_return_t kret;
1025	+	unsigned int portIndex;
1026	+	mach_port_t port;
1027	+	exception_behavior_t behavior;
1028	+	thread_state_flavor_t flavor;
1029	+	thread_state_t thread_state;
1030	+	mach_msg_type_number_t thread_state_count;
1031	+
1032	+	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1033	+	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1034	+	// This handler wants the exception
1035	+	break;
1036	+	}
1037	+	}
1038	+
1039	+	if (portIndex >= oldExceptionPorts->maskCount) {
1040	+	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1041	+	return KERN_FAILURE;
1042	+	}
1043	+
1044	+	port = oldExceptionPorts->handlers[portIndex];
1045	+	behavior = oldExceptionPorts->behaviors[portIndex];
1046	+	flavor = oldExceptionPorts->flavors[portIndex];
1047	+
1048	+	/*
1049	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1050	+	*/
1051	+
1052	+	if (behavior != EXCEPTION_DEFAULT) {
1053	+	thread_state_count = THREAD_STATE_MAX;
1054	+	kret = thread_get_state (thread_port, flavor, thread_state,
1055	+	&thread_state_count);
1056	+	MACH_CHECK_ERROR (thread_get_state, kret);
1057	+	}
1058	+
1059	+	switch (behavior) {
1060	+	case EXCEPTION_DEFAULT:
1061	+	// fprintf(stderr, "forwarding to exception_raise\n");
1062	+	kret = exception_raise(port, thread_port, task_port, exception_type,
1063	+	exception_data, data_count);
1064	+	MACH_CHECK_ERROR (exception_raise, kret);
1065	+	break;
1066	+	case EXCEPTION_STATE:
1067	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
1068	+	kret = exception_raise_state(port, exception_type, exception_data,
1069	+	data_count, &flavor,
1070	+	thread_state, thread_state_count,
1071	+	thread_state, &thread_state_count);
1072	+	MACH_CHECK_ERROR (exception_raise_state, kret);
1073	+	break;
1074	+	case EXCEPTION_STATE_IDENTITY:
1075	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1076	+	kret = exception_raise_state_identity(port, thread_port, task_port,
1077	+	exception_type, exception_data,
1078	+	data_count, &flavor,
1079	+	thread_state, thread_state_count,
1080	+	thread_state, &thread_state_count);
1081	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1082	+	break;
1083	+	default:
1084	+	fprintf(stderr, "forward_exception got unknown behavior\n");
1085	+	break;
1086	+	}
1087	+
1088	+	if (behavior != EXCEPTION_DEFAULT) {
1089	+	kret = thread_set_state (thread_port, flavor, thread_state,
1090	+	thread_state_count);
1091	+	MACH_CHECK_ERROR (thread_set_state, kret);
1092	+	}
1093	+
1094	+	return KERN_SUCCESS;
1095	+	}
1096	+
1097	+	/*
1098	+	* This is the code that actually handles the exception.
1099	+	* It is called by exc_server. For Darwin 5 Apple changed
1100	+	* this a bit from how this family of functions worked in
1101	+	* Mach. If you are familiar with that it is a little
1102	+	* different. The main variation that concerns us here is
1103	+	* that code is an array of exception specific codes and
1104	+	* codeCount is a count of the number of codes in the code
1105	+	* array. In typical Mach all exceptions have a code
1106	+	* and sub-code. It happens to be the case that for a
1107	+	* EXC_BAD_ACCESS exception the first entry is the type of
1108	+	* bad access that occurred and the second entry is the
1109	+	* faulting address so these entries correspond exactly to
1110	+	* how the code and sub-code are used on Mach.
1111	+	*
1112	+	* This is a MIG interface. No code in Basilisk II should
1113	+	* call this directley. This has to have external C
1114	+	* linkage because that is what exc_server expects.
1115	+	*/
1116	+	kern_return_t
1117	+	catch_exception_raise(mach_port_t exception_port,
1118	+	mach_port_t thread,
1119	+	mach_port_t task,
1120	+	exception_type_t exception,
1121	+	exception_data_t code,
1122	+	mach_msg_type_number_t codeCount)
1123	+	{
1124	+	ppc_thread_state_t state;
1125	+	kern_return_t krc;
1126	+
1127	+	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
1128	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1129	+	return KERN_SUCCESS;
1130	+	}
1131	+
1132	+	// In Mach we do not need to remove the exception handler.
1133	+	// If we forward the exception, eventually some exception handler
1134	+	// will take care of this exception.
1135	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1136	+
1137	+	return krc;
1138	+	}
1139	+	#endif
1140	+
1141		#ifdef HAVE_SIGSEGV_RECOVERY
1142	+	// Handle bad memory accesses with signal handler
1143		static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1144		{
1145	<	// Call user's handler and reinstall the global handler, if required
1146	<	if (sigsegv_user_handler((sigsegv_address_t)SIGSEGV_FAULT_ADDRESS, (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION)) {
1145	>	// Call handler and reinstall the global handler, if required
1146	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1147		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1148		sigsegv_do_install_handler(sig);
1149		#endif
1150	+	return;
1151		}
1152	<	else {
1153	<	// FAIL: reinstall default handler for "safe" crash
1152	>
1153	>	// Failure: reinstall default handler for "safe" crash
1154		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1155	<	SIGSEGV_ALL_SIGNALS
1155	>	SIGSEGV_ALL_SIGNALS
1156		#undef FAULT_HANDLER
298	–	}
1157		}
1158		#endif
1159
#	Line 309 | Line 1167 | static bool sigsegv_do_install_handler(i
1167		{
1168		// Setup SIGSEGV handler to process writes to frame buffer
1169		#ifdef HAVE_SIGACTION
1170	<	struct sigaction vosf_sa;
1171	<	sigemptyset(&vosf_sa.sa_mask);
1172	<	vosf_sa.sa_sigaction = sigsegv_handler;
1173	<	vosf_sa.sa_flags = SA_SIGINFO;
1174	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1170	>	struct sigaction sigsegv_sa;
1171	>	sigemptyset(&sigsegv_sa.sa_mask);
1172	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1173	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1174	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1175		#else
1176		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1177		#endif
#	Line 325 | Line 1183 | static bool sigsegv_do_install_handler(i
1183		{
1184		// Setup SIGSEGV handler to process writes to frame buffer
1185		#ifdef HAVE_SIGACTION
1186	<	struct sigaction vosf_sa;
1187	<	sigemptyset(&vosf_sa.sa_mask);
1188	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1186	>	struct sigaction sigsegv_sa;
1187	>	sigemptyset(&sigsegv_sa.sa_mask);
1188	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1189	>	sigsegv_sa.sa_flags = 0;
1190		#if !EMULATED_68K && defined(__NetBSD__)
1191	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1192	<	vosf_sa.sa_flags = SA_ONSTACK;
334	<	#else
335	<	vosf_sa.sa_flags = 0;
1191	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1192	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1193		#endif
1194	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1194	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1195		#else
1196		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1197		#endif
1198		}
1199		#endif
1200
1201	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
1201	>	#if defined(HAVE_MACH_EXCEPTIONS)
1202	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1203		{
1204	<	#ifdef HAVE_SIGSEGV_RECOVERY
1205	<	sigsegv_user_handler = handler;
1204	>	/*
1205	>	* Except for the exception port functions, this should be
1206	>	* pretty much stock Mach. If later you choose to support
1207	>	* other Mach's besides Darwin, just check for __MACH__
1208	>	* here and __APPLE__ where the actual differences are.
1209	>	*/
1210	>	#if defined(__APPLE__) && defined(__MACH__)
1211	>	if (sigsegv_fault_handler != NULL) {
1212	>	sigsegv_fault_handler = handler;
1213	>	return true;
1214	>	}
1215	>
1216	>	kern_return_t krc;
1217	>
1218	>	// create the the exception port
1219	>	krc = mach_port_allocate(mach_task_self(),
1220	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1221	>	if (krc != KERN_SUCCESS) {
1222	>	mach_error("mach_port_allocate", krc);
1223	>	return false;
1224	>	}
1225	>
1226	>	// add a port send right
1227	>	krc = mach_port_insert_right(mach_task_self(),
1228	>	_exceptionPort, _exceptionPort,
1229	>	MACH_MSG_TYPE_MAKE_SEND);
1230	>	if (krc != KERN_SUCCESS) {
1231	>	mach_error("mach_port_insert_right", krc);
1232	>	return false;
1233	>	}
1234	>
1235	>	// get the old exception ports
1236	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1237	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1238	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1239	>	if (krc != KERN_SUCCESS) {
1240	>	mach_error("thread_get_exception_ports", krc);
1241	>	return false;
1242	>	}
1243	>
1244	>	// set the new exception port
1245	>	//
1246	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1247	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1248	>	// message, but it turns out that in the common case this is not
1249	>	// neccessary. If we need it we can later ask for it from the
1250	>	// suspended thread.
1251	>	//
1252	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1253	>	// counter in the thread state.  The comments in the header file
1254	>	// seem to imply that you can count on the GPR's on an exception
1255	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1256	>	// you have to ask for all of the GPR's anyway just to get the
1257	>	// program counter. In any case because of update effective
1258	>	// address from immediate and update address from effective
1259	>	// addresses of ra and rb modes (as good an name as any for these
1260	>	// addressing modes) used in PPC instructions, you will need the
1261	>	// GPR state anyway.
1262	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1263	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1264	>	if (krc != KERN_SUCCESS) {
1265	>	mach_error("thread_set_exception_ports", krc);
1266	>	return false;
1267	>	}
1268	>
1269	>	// create the exception handler thread
1270	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1271	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1272	>	return false;
1273	>	}
1274	>
1275	>	// do not care about the exception thread any longer, let is run standalone
1276	>	(void)pthread_detach(exc_thread);
1277	>
1278	>	sigsegv_fault_handler = handler;
1279	>	return true;
1280	>	#else
1281	>	return false;
1282	>	#endif
1283	>	}
1284	>	#endif
1285	>
1286	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1287	>	{
1288	>	#if defined(HAVE_SIGSEGV_RECOVERY)
1289		bool success = true;
1290		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1291		SIGSEGV_ALL_SIGNALS
1292		#undef FAULT_HANDLER
1293	+	if (success)
1294	+	sigsegv_fault_handler = handler;
1295		return success;
1296	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1297	+	return sigsegv_do_install_handler(handler);
1298		#else
1299		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1300		return false;
#	Line 363 | Line 1308 | bool sigsegv_install_handler(sigsegv_han
1308
1309		void sigsegv_deinstall_handler(void)
1310		{
1311	+	// We do nothing for Mach exceptions, the thread would need to be
1312	+	// suspended if not already so, and we might mess with other
1313	+	// exception handlers that came after we registered ours. There is
1314	+	// no need to remove the exception handler, in fact this function is
1315	+	// not called anywhere in Basilisk II.
1316		#ifdef HAVE_SIGSEGV_RECOVERY
1317	<	sigsegv_user_handler = 0;
1317	>	sigsegv_fault_handler = 0;
1318		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1319		SIGSEGV_ALL_SIGNALS
1320		#undef FAULT_HANDLER
1321		#endif
1322		}
1323
1324	+
1325	+	/*
1326	+	*  Set callback function when we cannot handle the fault
1327	+	*/
1328	+
1329	+	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
1330	+	{
1331	+	sigsegv_state_dumper = handler;
1332	+	}
1333	+
1334	+
1335		/*
1336		*  Test program used for configure/test
1337		*/
#	Line 382 | Line 1343 | void sigsegv_deinstall_handler(void)
1343		#include <sys/mman.h>
1344		#include "vm_alloc.h"
1345
1346	+	const int REF_INDEX = 123;
1347	+	const int REF_VALUE = 45;
1348	+
1349		static int page_size;
1350		static volatile char * page = 0;
1351		static volatile int handler_called = 0;
1352
1353	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1353	>	#ifdef __GNUC__
1354	>	// Code range where we expect the fault to come from
1355	>	static void *b_region, *e_region;
1356	>	#endif
1357	>
1358	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1359		{
1360		handler_called++;
1361	<	if ((fault_address - 123) != page)
1362	<	exit(1);
1361	>	if ((fault_address - REF_INDEX) != page)
1362	>	exit(10);
1363	>	#ifdef __GNUC__
1364	>	// Make sure reported fault instruction address falls into
1365	>	// expected code range
1366	>	if (instruction_address != SIGSEGV_INVALID_PC
1367	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1368	>	(instruction_address >= (sigsegv_address_t)e_region)))
1369	>	exit(11);
1370	>	#endif
1371		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
1372	<	exit(1);
1372	>	exit(12);
1373	>	return SIGSEGV_RETURN_SUCCESS;
1374	>	}
1375	>
1376	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1377	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1378	>	{
1379	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1380	>	#ifdef __GNUC__
1381	>	// Make sure reported fault instruction address falls into
1382	>	// expected code range
1383	>	if (instruction_address != SIGSEGV_INVALID_PC
1384	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1385	>	(instruction_address >= (sigsegv_address_t)e_region)))
1386	>	return SIGSEGV_RETURN_FAILURE;
1387	>	#endif
1388	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1389	>	}
1390	>
1391	>	return SIGSEGV_RETURN_FAILURE;
1392	>	}
1393	>
1394	>	// More sophisticated tests for instruction skipper
1395	>	static bool arch_insn_skipper_tests()
1396	>	{
1397	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
1398	>	static const unsigned char code[] = {
1399	>	0x8a, 0x00,                    // mov    (%eax),%al
1400	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
1401	>	0x88, 0x20,                    // mov    %ah,(%eax)
1402	>	0x88, 0x08,                    // mov    %cl,(%eax)
1403	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
1404	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
1405	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
1406	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
1407	>	0x8b, 0x00,                    // mov    (%eax),%eax
1408	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
1409	>	0x89, 0x00,                    // mov    %eax,(%eax)
1410	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
1411	>	#if defined(__x86_64__)
1412	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
1413	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
1414	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
1415	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
1416	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
1417	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
1418	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
1419	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
1420	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
1421	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
1422	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
1423	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
1424	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
1425	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
1426	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
1427	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
1428	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
1429	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
1430	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
1431	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
1432	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
1433	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
1434	>	#endif
1435	>	0                              // end
1436	>	};
1437	>	const int N_REGS = 20;
1438	>	unsigned long regs[N_REGS];
1439	>	for (int i = 0; i < N_REGS; i++)
1440	>	regs[i] = i;
1441	>	const unsigned long start_code = (unsigned long)&code;
1442	>	regs[X86_REG_EIP] = start_code;
1443	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
1444	>	&& ix86_skip_instruction(regs))
1445	>	; /* simply iterate */
1446	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
1447	>	#endif
1448		return true;
1449		}
1450	+	#endif
1451
1452		int main(void)
1453		{
#	Line 403 | Line 1456 | int main(void)
1456
1457		page_size = getpagesize();
1458		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1459	<	return 1;
1459	>	return 2;
1460
1461	+	memset((void *)page, 0, page_size);
1462		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1463	<	return 1;
1463	>	return 3;
1464
1465		if (!sigsegv_install_handler(sigsegv_test_handler))
1466	<	return 1;
413	<
414	<	page[123] = 45;
415	<	page[123] = 45;
1466	>	return 4;
1467
1468	+	#ifdef __GNUC__
1469	+	b_region = &&L_b_region1;
1470	+	e_region = &&L_e_region1;
1471	+	#endif
1472	+	L_b_region1:
1473	+	page[REF_INDEX] = REF_VALUE;
1474	+	if (page[REF_INDEX] != REF_VALUE)
1475	+	exit(20);
1476	+	page[REF_INDEX] = REF_VALUE;
1477	+	L_e_region1:
1478	+
1479		if (handler_called != 1)
1480	<	return 1;
1480	>	return 5;
1481	>
1482	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1483	>	if (!sigsegv_install_handler(sigsegv_insn_handler))
1484	>	return 6;
1485	>
1486	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
1487	>	return 7;
1488	>
1489	>	for (int i = 0; i < page_size; i++)
1490	>	page[i] = (i + 1) % page_size;
1491	>
1492	>	if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1493	>	return 8;
1494	>
1495	>	#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
1496	>	const unsigned long TAG = 0x12345678 |                  \
1497	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
1498	>	TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
1499	>	volatile unsigned long effect = data + TAG;             \
1500	>	if (effect != TAG)                                                              \
1501	>	return 9;                                                                       \
1502	>	} while (0)
1503	>
1504	>	#ifdef __GNUC__
1505	>	b_region = &&L_b_region2;
1506	>	e_region = &&L_e_region2;
1507	>	#endif
1508	>	L_b_region2:
1509	>	TEST_SKIP_INSTRUCTION(unsigned char);
1510	>	TEST_SKIP_INSTRUCTION(unsigned short);
1511	>	TEST_SKIP_INSTRUCTION(unsigned int);
1512	>	TEST_SKIP_INSTRUCTION(unsigned long);
1513	>	L_e_region2:
1514	>
1515	>	if (!arch_insn_skipper_tests())
1516	>	return 20;
1517	>	#endif
1518
1519		vm_exit();
1520		return 0;

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