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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.10 by gbeauche, 2002-05-12T11:10:50Z vs.
Revision 1.34 by gbeauche, 2003-11-10T23:47:39Z

#	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_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_handler_t sigsegv_dump_state = 0;
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
#	Line 65 | Line 219 | static bool sigsegv_do_install_handler(i
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(__sun__)
226	+	#if (defined(sparc) || defined(__sparc__))
227	+	#include <sys/ucontext.h>
228	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
229	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[REG_PC]
230	+	#endif
231	+	#endif
232	+	#if defined(__FreeBSD__)
233	+	#if (defined(i386) || defined(__i386__))
234	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
235	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
236	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
237	+	#endif
238	+	#endif
239		#if defined(__linux__)
240		#if (defined(i386) || defined(__i386__))
241		#include <sys/ucontext.h>
242	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
243	<	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)(((ucontext_t *)scp)->uc_mcontext.gregs)
242	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
243	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
244	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
245	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
246	>	#endif
247	>	#if (defined(x86_64) || defined(__x86_64__))
248	>	#include <sys/ucontext.h>
249	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
250	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
251	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
252		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
253		#endif
254		#if (defined(ia64) || defined(__ia64__))
#	Line 78 | Line 256 | static bool sigsegv_do_install_handler(i
256		#endif
257		#if (defined(powerpc) || defined(__powerpc__))
258		#include <sys/ucontext.h>
259	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.regs->nip)
259	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
260	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
261	>	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
262	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
263		#endif
264		#endif
265		#endif
#	Line 90 | Line 271 | static bool sigsegv_do_install_handler(i
271		#if (defined(i386) || defined(__i386__))
272		#include <asm/sigcontext.h>
273		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
274	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
275	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
276	<	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)(&scs)
274	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
275	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
276	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
277	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
278	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
279		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
280		#endif
281		#if (defined(sparc) || defined(__sparc__))
282		#include <asm/sigcontext.h>
283		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
284	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
285		#define SIGSEGV_FAULT_ADDRESS                   addr
286		#endif
287		#if (defined(powerpc) || defined(__powerpc__))
288		#include <asm/sigcontext.h>
289		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
290	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
291		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
292		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
293	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
294	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
295		#endif
296		#if (defined(alpha) || defined(__alpha__))
297		#include <asm/sigcontext.h>
298		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
299	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
300		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
301		#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	–	}
302		#endif
303		#endif
304
305		// Irix 5 or 6 on MIPS
306		#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
307	+	#include <ucontext.h>
308		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
309	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
310		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
311		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
312		#endif
313
314	+	// HP-UX
315	+	#if (defined(hpux) || defined(__hpux__))
316	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
317	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
318	+	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
319	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
320	+	#endif
321	+
322		// OSF/1 on Alpha
323		#if defined(__osf__)
324	+	#include <ucontext.h>
325		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
326	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
327		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
328		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
329		#endif
#	Line 140 | Line 331 | static sigsegv_address_t get_fault_addre
331		// AIX
332		#if defined(_AIX)
333		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
334	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
335		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
336		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
337		#endif
338
339	<	// NetBSD or FreeBSD
340	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
339	>	// NetBSD
340	>	#if defined(__NetBSD__)
341		#if (defined(m68k) || defined(__m68k__))
342		#include <m68k/frame.h>
343		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
344	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
345	<	struct sigstate {                                                                                                                                                                       \
154	<	int ss_flags;                                                                                                                                                                   \
155	<	struct frame ss_frame;                                                                                                                                                  \
156	<	};                                                                                                                                                                                                      \
157	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
158	<	char *fault_addr;                                                                                                                                                                       \
159	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
160	<	case 7:         /* 68040 access error */                                                                                                                                \
161	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
162	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
163	<	break;                                                                                                                                                                                  \
164	<	default:                                                                                                                                                                                        \
165	<	fault_addr = (char *)code;                                                                                                                                              \
166	<	break;                                                                                                                                                                                  \
167	<	}                                                                                                                                                                                                       \
168	<	fault_addr;                                                                                                                                                                                     \
169	<	})
344	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
345	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
346		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
347	<	#else
348	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
349	<	#define SIGSEGV_FAULT_ADDRESS                   addr
347	>
348	>	// Use decoding scheme from BasiliskII/m68k native
349	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
350	>	{
351	>	struct sigstate {
352	>	int ss_flags;
353	>	struct frame ss_frame;
354	>	};
355	>	struct sigstate *state = (struct sigstate *)scp->sc_ap;
356	>	char *fault_addr;
357	>	switch (state->ss_frame.f_format) {
358	>	case 7:         /* 68040 access error */
359	>	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
360	>	fault_addr = state->ss_frame.f_fmt7.f_fa;
361	>	break;
362	>	default:
363	>	fault_addr = (char *)code;
364	>	break;
365	>	}
366	>	return (sigsegv_address_t)fault_addr;
367	>	}
368	>	#endif
369	>	#if (defined(alpha) || defined(__alpha__))
370	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
371	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
372	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
373		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
374		#endif
375	+	#if (defined(i386) || defined(__i386__))
376	+	#error "FIXME: need to decode instruction and compute EA"
377	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
378	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
379	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
380	+	#endif
381	+	#endif
382	+	#if defined(__FreeBSD__)
383	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
384	+	#if (defined(i386) || defined(__i386__))
385	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
386	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
387	+	#define SIGSEGV_FAULT_ADDRESS                   addr
388	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
389	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
390	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
391	+	#endif
392	+	#endif
393	+
394	+	// Extract fault address out of a sigcontext
395	+	#if (defined(alpha) || defined(__alpha__))
396	+	// From Boehm's GC 6.0alpha8
397	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
398	+	{
399	+	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
400	+	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
401	+	fault_address += (signed long)(signed short)(instruction & 0xffff);
402	+	return (sigsegv_address_t)fault_address;
403	+	}
404		#endif
405
406	<	// MacOS X
406	>
407	>	// MacOS X, not sure which version this works in. Under 10.1
408	>	// vm_protect does not appear to work from a signal handler. Under
409	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
410	>	// field is the address of the faulting instruction and not the
411	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
412	>	// case with Mach exception handlers there is a way to do what this
413	>	// was meant to do.
414	>	#ifndef HAVE_MACH_EXCEPTIONS
415		#if defined(__APPLE__) && defined(__MACH__)
416		#if (defined(ppc) || defined(__ppc__))
417		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
418	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
419		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
420		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
421		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
422	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
423	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
424
425	<	// From Boehm's GC 6.0alpha8
187	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
188	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
189	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
190	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
191	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
192	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
193	<
425	>	// Use decoding scheme from SheepShaver
426		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
427		{
428	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
429	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
430	<	int            disp = 0, tmp;
431	<	unsigned int   baseA = 0, baseB = 0;
432	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
433	<
434	<	switch(EXTRACT_OP1(instr)) {
435	<	case 38:   /* stb */
436	<	case 39:   /* stbu */
437	<	case 54:   /* stfd */
438	<	case 55:   /* stfdu */
439	<	case 52:   /* stfs */
440	<	case 53:   /* stfsu */
441	<	case 44:   /* sth */
442	<	case 45:   /* sthu */
443	<	case 47:   /* stmw */
444	<	case 36:   /* stw */
445	<	case 37:   /* stwu */
446	<	tmp = EXTRACT_REGA(instr);
447	<	if(tmp > 0)
448	<	baseA = regs[tmp];
449	<	disp = EXTRACT_DISP(instr);
450	<	break;
451	<	case 31:
452	<	switch(EXTRACT_OP2(instr)) {
453	<	case 86:    /* dcbf */
454	<	case 54:    /* dcbst */
455	<	case 1014:  /* dcbz */
456	<	case 247:   /* stbux */
457	<	case 215:   /* stbx */
458	<	case 759:   /* stfdux */
459	<	case 727:   /* stfdx */
460	<	case 983:   /* stfiwx */
461	<	case 695:   /* stfsux */
462	<	case 663:   /* stfsx */
463	<	case 918:   /* sthbrx */
464	<	case 439:   /* sthux */
465	<	case 407:   /* sthx */
466	<	case 661:   /* stswx */
467	<	case 662:   /* stwbrx */
468	<	case 150:   /* stwcx. */
469	<	case 183:   /* stwux */
470	<	case 151:   /* stwx */
471	<	case 135:   /* stvebx */
472	<	case 167:   /* stvehx */
473	<	case 199:   /* stvewx */
474	<	case 231:   /* stvx */
475	<	case 487:   /* stvxl */
476	<	tmp = EXTRACT_REGA(instr);
477	<	if(tmp > 0)
478	<	baseA = regs[tmp];
479	<	baseB = regs[EXTRACT_REGC(instr)];
480	<	/* determine Altivec alignment mask */
481	<	switch(EXTRACT_OP2(instr)) {
482	<	case 167:   /* stvehx */
483	<	alignmask = 0xFFFFFFFE;
484	<	break;
485	<	case 199:   /* stvewx */
486	<	alignmask = 0xFFFFFFFC;
487	<	break;
488	<	case 231:   /* stvx */
489	<	alignmask = 0xFFFFFFF0;
490	<	break;
491	<	case 487:  /* stvxl */
492	<	alignmask = 0xFFFFFFF0;
493	<	break;
494	<	}
495	<	break;
496	<	case 725:   /* stswi */
497	<	tmp = EXTRACT_REGA(instr);
498	<	if(tmp > 0)
499	<	baseA = regs[tmp];
500	<	break;
501	<	default:   /* ignore instruction */
502	<	return 0;
503	<	break;
428	>	unsigned int   nip = (unsigned int) scp->sc_ir;
429	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
430	>	instruction_t  instr;
431	>
432	>	powerpc_decode_instruction(&instr, nip, gpr);
433	>	return (sigsegv_address_t)instr.addr;
434	>	}
435	>	#endif
436	>	#endif
437	>	#endif
438	>	#endif
439	>
440	>	#if HAVE_MACH_EXCEPTIONS
441	>
442	>	// This can easily be extended to other Mach systems, but really who
443	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
444	>	// Mach 2.5/3.0?
445	>	#if defined(__APPLE__) && defined(__MACH__)
446	>
447	>	#include <sys/types.h>
448	>	#include <stdlib.h>
449	>	#include <stdio.h>
450	>	#include <pthread.h>
451	>
452	>	/*
453	>	* If you are familiar with MIG then you will understand the frustration
454	>	* that was necessary to get these embedded into C++ code by hand.
455	>	*/
456	>	extern "C" {
457	>	#include <mach/mach.h>
458	>	#include <mach/mach_error.h>
459	>
460	>	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
461	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
462	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
463	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
464	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
465	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
466	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
467	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
468	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
469	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
470	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
471	>	}
472	>
473	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
474	>	#define HANDLER_COUNT 64
475	>
476	>	// structure to tuck away existing exception handlers
477	>	typedef struct _ExceptionPorts {
478	>	mach_msg_type_number_t maskCount;
479	>	exception_mask_t masks[HANDLER_COUNT];
480	>	exception_handler_t handlers[HANDLER_COUNT];
481	>	exception_behavior_t behaviors[HANDLER_COUNT];
482	>	thread_state_flavor_t flavors[HANDLER_COUNT];
483	>	} ExceptionPorts;
484	>
485	>	// exception handler thread
486	>	static pthread_t exc_thread;
487	>
488	>	// place where old exception handler info is stored
489	>	static ExceptionPorts ports;
490	>
491	>	// our exception port
492	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
493	>
494	>	#define MACH_CHECK_ERROR(name,ret) \
495	>	if (ret != KERN_SUCCESS) { \
496	>	mach_error(#name, ret); \
497	>	exit (1); \
498	>	}
499	>
500	>	#define SIGSEGV_FAULT_ADDRESS                   code[1]
501	>	#define SIGSEGV_FAULT_INSTRUCTION               get_fault_instruction(thread, state)
502	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
503	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
504	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
505	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
506	>	#define SIGSEGV_REGISTER_FILE                   &state->srr0, &state->r0
507	>
508	>	// Given a suspended thread, stuff the current instruction and
509	>	// registers into state.
510	>	//
511	>	// It would have been nice to have this be ppc/x86 independant which
512	>	// could have been done easily with a thread_state_t instead of
513	>	// ppc_thread_state_t, but because of the way this is called it is
514	>	// easier to do it this way.
515	>	#if (defined(ppc) || defined(__ppc__))
516	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
517	>	{
518	>	kern_return_t krc;
519	>	mach_msg_type_number_t count;
520	>
521	>	count = MACHINE_THREAD_STATE_COUNT;
522	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
523	>	MACH_CHECK_ERROR (thread_get_state, krc);
524	>
525	>	return (sigsegv_address_t)state->srr0;
526	>	}
527	>	#endif
528	>
529	>	// Since there can only be one exception thread running at any time
530	>	// this is not a problem.
531	>	#define MSG_SIZE 512
532	>	static char msgbuf[MSG_SIZE];
533	>	static char replybuf[MSG_SIZE];
534	>
535	>	/*
536	>	* This is the entry point for the exception handler thread. The job
537	>	* of this thread is to wait for exception messages on the exception
538	>	* port that was setup beforehand and to pass them on to exc_server.
539	>	* exc_server is a MIG generated function that is a part of Mach.
540	>	* Its job is to decide what to do with the exception message. In our
541	>	* case exc_server calls catch_exception_raise on our behalf. After
542	>	* exc_server returns, it is our responsibility to send the reply.
543	>	*/
544	>	static void *
545	>	handleExceptions(void *priv)
546	>	{
547	>	mach_msg_header_t *msg, *reply;
548	>	kern_return_t krc;
549	>
550	>	msg = (mach_msg_header_t *)msgbuf;
551	>	reply = (mach_msg_header_t *)replybuf;
552	>
553	>	for (;;) {
554	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
555	>	_exceptionPort, 0, MACH_PORT_NULL);
556	>	MACH_CHECK_ERROR(mach_msg, krc);
557	>
558	>	if (!exc_server(msg, reply)) {
559	>	fprintf(stderr, "exc_server hated the message\n");
560	>	exit(1);
561	>	}
562	>
563	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
564	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
565	>	if (krc != KERN_SUCCESS) {
566	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
567	>	krc, mach_error_string(krc));
568	>	exit(1);
569		}
273	–	break;
274	–	default:   /* ignore instruction */
275	–	return 0;
276	–	break;
570		}
278	–
279	–	addr = (baseA + baseB) + disp;
280	–	addr &= alignmask;
281	–	return (sigsegv_address_t)addr;
571		}
572		#endif
573		#endif
574	<	#endif
574	>
575	>
576	>	/*
577	>	*  Instruction skipping
578	>	*/
579
580		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
581		// Decode and skip X86 instruction
582	<	#if (defined(i386) || defined(__i386__))
582	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
583		#if defined(__linux__)
584		enum {
585	+	#if (defined(i386) || defined(__i386__))
586		X86_REG_EIP = 14,
587		X86_REG_EAX = 11,
588		X86_REG_ECX = 10,
#	Line 298 | Line 592 | enum {
592		X86_REG_EBP = 6,
593		X86_REG_ESI = 5,
594		X86_REG_EDI = 4
595	+	#endif
596	+	#if defined(__x86_64__)
597	+	X86_REG_R8  = 0,
598	+	X86_REG_R9  = 1,
599	+	X86_REG_R10 = 2,
600	+	X86_REG_R11 = 3,
601	+	X86_REG_R12 = 4,
602	+	X86_REG_R13 = 5,
603	+	X86_REG_R14 = 6,
604	+	X86_REG_R15 = 7,
605	+	X86_REG_EDI = 8,
606	+	X86_REG_ESI = 9,
607	+	X86_REG_EBP = 10,
608	+	X86_REG_EBX = 11,
609	+	X86_REG_EDX = 12,
610	+	X86_REG_EAX = 13,
611	+	X86_REG_ECX = 14,
612	+	X86_REG_ESP = 15,
613	+	X86_REG_EIP = 16
614	+	#endif
615	+	};
616	+	#endif
617	+	#if defined(__NetBSD__) || defined(__FreeBSD__)
618	+	enum {
619	+	#if (defined(i386) || defined(__i386__))
620	+	X86_REG_EIP = 10,
621	+	X86_REG_EAX = 7,
622	+	X86_REG_ECX = 6,
623	+	X86_REG_EDX = 5,
624	+	X86_REG_EBX = 4,
625	+	X86_REG_ESP = 13,
626	+	X86_REG_EBP = 2,
627	+	X86_REG_ESI = 1,
628	+	X86_REG_EDI = 0
629	+	#endif
630		};
631		#endif
632		// FIXME: this is partly redundant with the instruction decoding phase
#	Line 334 | Line 663 | static inline int ix86_step_over_modrm(u
663		return offset;
664		}
665
666	<	static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs)
666	>	static bool ix86_skip_instruction(unsigned long * regs)
667		{
668	<	unsigned char * eip = (unsigned char *)fault_instruction;
668	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
669
670		if (eip == 0)
671		return false;
672
673	<	// Transfer type
674	<	enum {
346	<	TYPE_UNKNOWN,
347	<	TYPE_LOAD,
348	<	TYPE_STORE
349	<	} transfer_type = TYPE_UNKNOWN;
350	<
351	<	// Transfer size
352	<	enum {
353	<	SIZE_BYTE,
354	<	SIZE_WORD,
355	<	SIZE_LONG
356	<	} transfer_size = SIZE_LONG;
673	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
674	>	transfer_size_t transfer_size = SIZE_LONG;
675
676		int reg = -1;
677		int len = 0;
678	<
678	>
679	>	#if DEBUG
680	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
681	>	eip, eip[0], eip[1], eip[2], eip[3]);
682	>	#endif
683	>
684		// Operand size prefix
685		if (*eip == 0x66) {
686		eip++;
#	Line 365 | Line 688 | static bool ix86_skip_instruction(sigseg
688		transfer_size = SIZE_WORD;
689		}
690
691	+	// REX prefix
692	+	#if defined(__x86_64__)
693	+	struct rex_t {
694	+	unsigned char W;
695	+	unsigned char R;
696	+	unsigned char X;
697	+	unsigned char B;
698	+	};
699	+	rex_t rex = { 0, 0, 0, 0 };
700	+	bool has_rex = false;
701	+	if ((*eip & 0xf0) == 0x40) {
702	+	has_rex = true;
703	+	const unsigned char b = *eip;
704	+	rex.W = b & (1 << 3);
705	+	rex.R = b & (1 << 2);
706	+	rex.X = b & (1 << 1);
707	+	rex.B = b & (1 << 0);
708	+	#if DEBUG
709	+	printf("REX: %c,%c,%c,%c\n",
710	+	rex.W ? 'W' : '_',
711	+	rex.R ? 'R' : '_',
712	+	rex.X ? 'X' : '_',
713	+	rex.B ? 'B' : '_');
714	+	#endif
715	+	eip++;
716	+	len++;
717	+	if (rex.W)
718	+	transfer_size = SIZE_QUAD;
719	+	}
720	+	#else
721	+	const bool has_rex = false;
722	+	#endif
723	+
724		// Decode instruction
725		switch (eip[0]) {
726	+	case 0x0f:
727	+	switch (eip[1]) {
728	+	case 0xb6: // MOVZX r32, r/m8
729	+	case 0xb7: // MOVZX r32, r/m16
730	+	switch (eip[2] & 0xc0) {
731	+	case 0x80:
732	+	reg = (eip[2] >> 3) & 7;
733	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
734	+	break;
735	+	case 0x40:
736	+	reg = (eip[2] >> 3) & 7;
737	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
738	+	break;
739	+	case 0x00:
740	+	reg = (eip[2] >> 3) & 7;
741	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
742	+	break;
743	+	}
744	+	len += 3 + ix86_step_over_modrm(eip + 2);
745	+	break;
746	+	}
747	+	break;
748		case 0x8a: // MOV r8, r/m8
749		transfer_size = SIZE_BYTE;
750		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
751		switch (eip[1] & 0xc0) {
752		case 0x80:
753		reg = (eip[1] >> 3) & 7;
754	<	transfer_type = TYPE_LOAD;
754	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
755		break;
756		case 0x40:
757		reg = (eip[1] >> 3) & 7;
758	<	transfer_type = TYPE_LOAD;
758	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
759		break;
760		case 0x00:
761		reg = (eip[1] >> 3) & 7;
762	<	transfer_type = TYPE_LOAD;
762	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
763		break;
764		}
765		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 392 | Line 770 | static bool ix86_skip_instruction(sigseg
770		switch (eip[1] & 0xc0) {
771		case 0x80:
772		reg = (eip[1] >> 3) & 7;
773	<	transfer_type = TYPE_STORE;
773	>	transfer_type = SIGSEGV_TRANSFER_STORE;
774		break;
775		case 0x40:
776		reg = (eip[1] >> 3) & 7;
777	<	transfer_type = TYPE_STORE;
777	>	transfer_type = SIGSEGV_TRANSFER_STORE;
778		break;
779		case 0x00:
780		reg = (eip[1] >> 3) & 7;
781	<	transfer_type = TYPE_STORE;
781	>	transfer_type = SIGSEGV_TRANSFER_STORE;
782		break;
783		}
784		len += 2 + ix86_step_over_modrm(eip + 1);
785		break;
786		}
787
788	<	if (transfer_type == TYPE_UNKNOWN) {
788	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
789		// Unknown machine code, let it crash. Then patch the decoder
790		return false;
791		}
792
793	<	if (transfer_type == TYPE_LOAD && reg != -1) {
794	<	static const int x86_reg_map[8] = {
793	>	#if defined(__x86_64__)
794	>	if (rex.R)
795	>	reg += 8;
796	>	#endif
797	>
798	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
799	>	static const int x86_reg_map[] = {
800		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
801	<	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
801	>	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
802	>	#if defined(__x86_64__)
803	>	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
804	>	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
805	>	#endif
806		};
807
808	<	if (reg < 0 || reg >= 8)
808	>	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
809		return false;
810
811	+	// Set 0 to the relevant register part
812	+	// NOTE: this is only valid for MOV alike instructions
813		int rloc = x86_reg_map[reg];
814		switch (transfer_size) {
815		case SIZE_BYTE:
816	<	regs[rloc] = (regs[rloc] & ~0xff);
816	>	if (!has_rex && reg >= 4)
817	>	regs[rloc - 4] = (regs[rloc - 4] & ~0xff00L);
818	>	else
819	>	regs[rloc] = (regs[rloc] & ~0xffL);
820		break;
821		case SIZE_WORD:
822	<	regs[rloc] = (regs[rloc] & ~0xffff);
822	>	regs[rloc] = (regs[rloc] & ~0xffffL);
823		break;
824		case SIZE_LONG:
825	+	case SIZE_QUAD: // zero-extension
826		regs[rloc] = 0;
827		break;
828		}
#	Line 437 | Line 830 | static bool ix86_skip_instruction(sigseg
830
831		#if DEBUG
832		printf("%08x: %s %s access", regs[X86_REG_EIP],
833	<	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
834	<	transfer_type == TYPE_LOAD ? "read" : "write");
833	>	transfer_size == SIZE_BYTE ? "byte" :
834	>	transfer_size == SIZE_WORD ? "word" :
835	>	transfer_size == SIZE_LONG ? "long" :
836	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
837	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
838
839		if (reg != -1) {
840	<	static const char * x86_reg_str_map[8] = {
841	<	"eax", "ecx", "edx", "ebx",
842	<	"esp", "ebp", "esi", "edi"
840	>	static const char * x86_byte_reg_str_map[] = {
841	>	"al",   "cl",   "dl",   "bl",
842	>	"spl",  "bpl",  "sil",  "dil",
843	>	"r8b",  "r9b",  "r10b", "r11b",
844	>	"r12b", "r13b", "r14b", "r15b",
845	>	"ah",   "ch",   "dh",   "bh",
846	>	};
847	>	static const char * x86_word_reg_str_map[] = {
848	>	"ax",   "cx",   "dx",   "bx",
849	>	"sp",   "bp",   "si",   "di",
850	>	"r8w",  "r9w",  "r10w", "r11w",
851	>	"r12w", "r13w", "r14w", "r15w",
852	>	};
853	>	static const char *x86_long_reg_str_map[] = {
854	>	"eax",  "ecx",  "edx",  "ebx",
855	>	"esp",  "ebp",  "esi",  "edi",
856	>	"r8d",  "r9d",  "r10d", "r11d",
857	>	"r12d", "r13d", "r14d", "r15d",
858	>	};
859	>	static const char *x86_quad_reg_str_map[] = {
860	>	"rax", "rcx", "rdx", "rbx",
861	>	"rsp", "rbp", "rsi", "rdi",
862	>	"r8",  "r9",  "r10", "r11",
863	>	"r12", "r13", "r14", "r15",
864		};
865	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
865	>	const char * reg_str = NULL;
866	>	switch (transfer_size) {
867	>	case SIZE_BYTE:
868	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
869	>	break;
870	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
871	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
872	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
873	>	}
874	>	if (reg_str)
875	>	printf(" %s register %%%s",
876	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
877	>	reg_str);
878		}
879		printf(", %d bytes instruction\n", len);
880		#endif
#	Line 454 | Line 883 | static bool ix86_skip_instruction(sigseg
883		return true;
884		}
885		#endif
886	+
887	+	// Decode and skip PPC instruction
888	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
889	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
890	+	{
891	+	instruction_t instr;
892	+	powerpc_decode_instruction(&instr, *nip_p, regs);
893	+
894	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
895	+	// Unknown machine code, let it crash. Then patch the decoder
896	+	return false;
897	+	}
898	+
899	+	#if DEBUG
900	+	printf("%08x: %s %s access", *nip_p,
901	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
902	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
903	+
904	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
905	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
906	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
907	+	printf(" r%d (rd = 0)\n", instr.rd);
908	+	#endif
909	+
910	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
911	+	regs[instr.ra] = instr.addr;
912	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
913	+	regs[instr.rd] = 0;
914	+
915	+	*nip_p += 4;
916	+	return true;
917	+	}
918	+	#endif
919		#endif
920
921		// Fallbacks
922		#ifndef SIGSEGV_FAULT_INSTRUCTION
923		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
924		#endif
925	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
926	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
927	+	#endif
928	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
929	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
930	+	#endif
931
932		// SIGSEGV recovery supported ?
933		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 471 | Line 939 | static bool ix86_skip_instruction(sigseg
939		*  SIGSEGV global handler
940		*/
941
942	<	#ifdef HAVE_SIGSEGV_RECOVERY
943	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
942	>	#if defined(HAVE_SIGSEGV_RECOVERY) || defined(HAVE_MACH_EXCEPTIONS)
943	>	// This function handles the badaccess to memory.
944	>	// It is called from the signal handler or the exception handler.
945	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
946		{
947		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
948		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
479	–	bool fault_recovered = false;
949
950		// Call user's handler and reinstall the global handler, if required
951	<	if (sigsegv_user_handler(fault_address, fault_instruction)) {
952	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
953	<	sigsegv_do_install_handler(sig);
951	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
952	>	case SIGSEGV_RETURN_SUCCESS:
953	>	return true;
954	>
955	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
956	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
957	>	// Call the instruction skipper with the register file
958	>	// available
959	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
960	>	#ifdef HAVE_MACH_EXCEPTIONS
961	>	// Unlike UNIX signals where the thread state
962	>	// is modified off of the stack, in Mach we
963	>	// need to actually call thread_set_state to
964	>	// have the register values updated.
965	>	kern_return_t krc;
966	>
967	>	krc = thread_set_state(thread,
968	>	MACHINE_THREAD_STATE, (thread_state_t)state,
969	>	MACHINE_THREAD_STATE_COUNT);
970	>	MACH_CHECK_ERROR (thread_get_state, krc);
971	>	#endif
972	>	return true;
973	>	}
974	>	break;
975		#endif
486	–	fault_recovered = true;
976		}
977	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
978	<	else if (sigsegv_ignore_fault) {
979	<	// Call the instruction skipper with the register file available
980	<	if (SIGSEGV_SKIP_INSTRUCTION(fault_instruction, SIGSEGV_REGISTER_FILE))
981	<	fault_recovered = true;
977	>
978	>	// We can't do anything with the fault_address, dump state?
979	>	if (sigsegv_state_dumper != 0)
980	>	sigsegv_state_dumper(fault_address, fault_instruction);
981	>
982	>	return false;
983	>	}
984	>	#endif
985	>
986	>
987	>	/*
988	>	* There are two mechanisms for handling a bad memory access,
989	>	* Mach exceptions and UNIX signals. The implementation specific
990	>	* code appears below. Its reponsibility is to call handle_badaccess
991	>	* which is the routine that handles the fault in an implementation
992	>	* agnostic manner. The implementation specific code below is then
993	>	* reponsible for checking whether handle_badaccess was able
994	>	* to handle the memory access error and perform any implementation
995	>	* specific tasks necessary afterwards.
996	>	*/
997	>
998	>	#ifdef HAVE_MACH_EXCEPTIONS
999	>	/*
1000	>	* We need to forward all exceptions that we do not handle.
1001	>	* This is important, there are many exceptions that may be
1002	>	* handled by other exception handlers. For example debuggers
1003	>	* use exceptions and the exception hander is in another
1004	>	* process in such a case. (Timothy J. Wood states in his
1005	>	* message to the list that he based this code on that from
1006	>	* gdb for Darwin.)
1007	>	*/
1008	>	static inline kern_return_t
1009	>	forward_exception(mach_port_t thread_port,
1010	>	mach_port_t task_port,
1011	>	exception_type_t exception_type,
1012	>	exception_data_t exception_data,
1013	>	mach_msg_type_number_t data_count,
1014	>	ExceptionPorts *oldExceptionPorts)
1015	>	{
1016	>	kern_return_t kret;
1017	>	unsigned int portIndex;
1018	>	mach_port_t port;
1019	>	exception_behavior_t behavior;
1020	>	thread_state_flavor_t flavor;
1021	>	thread_state_t thread_state;
1022	>	mach_msg_type_number_t thread_state_count;
1023	>
1024	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1025	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1026	>	// This handler wants the exception
1027	>	break;
1028	>	}
1029	>	}
1030	>
1031	>	if (portIndex >= oldExceptionPorts->maskCount) {
1032	>	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1033	>	return KERN_FAILURE;
1034	>	}
1035	>
1036	>	port = oldExceptionPorts->handlers[portIndex];
1037	>	behavior = oldExceptionPorts->behaviors[portIndex];
1038	>	flavor = oldExceptionPorts->flavors[portIndex];
1039	>
1040	>	/*
1041	>	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1042	>	*/
1043	>
1044	>	if (behavior != EXCEPTION_DEFAULT) {
1045	>	thread_state_count = THREAD_STATE_MAX;
1046	>	kret = thread_get_state (thread_port, flavor, thread_state,
1047	>	&thread_state_count);
1048	>	MACH_CHECK_ERROR (thread_get_state, kret);
1049	>	}
1050	>
1051	>	switch (behavior) {
1052	>	case EXCEPTION_DEFAULT:
1053	>	// fprintf(stderr, "forwarding to exception_raise\n");
1054	>	kret = exception_raise(port, thread_port, task_port, exception_type,
1055	>	exception_data, data_count);
1056	>	MACH_CHECK_ERROR (exception_raise, kret);
1057	>	break;
1058	>	case EXCEPTION_STATE:
1059	>	// fprintf(stderr, "forwarding to exception_raise_state\n");
1060	>	kret = exception_raise_state(port, exception_type, exception_data,
1061	>	data_count, &flavor,
1062	>	thread_state, thread_state_count,
1063	>	thread_state, &thread_state_count);
1064	>	MACH_CHECK_ERROR (exception_raise_state, kret);
1065	>	break;
1066	>	case EXCEPTION_STATE_IDENTITY:
1067	>	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1068	>	kret = exception_raise_state_identity(port, thread_port, task_port,
1069	>	exception_type, exception_data,
1070	>	data_count, &flavor,
1071	>	thread_state, thread_state_count,
1072	>	thread_state, &thread_state_count);
1073	>	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1074	>	break;
1075	>	default:
1076	>	fprintf(stderr, "forward_exception got unknown behavior\n");
1077	>	break;
1078	>	}
1079	>
1080	>	if (behavior != EXCEPTION_DEFAULT) {
1081	>	kret = thread_set_state (thread_port, flavor, thread_state,
1082	>	thread_state_count);
1083	>	MACH_CHECK_ERROR (thread_set_state, kret);
1084	>	}
1085	>
1086	>	return KERN_SUCCESS;
1087	>	}
1088	>
1089	>	/*
1090	>	* This is the code that actually handles the exception.
1091	>	* It is called by exc_server. For Darwin 5 Apple changed
1092	>	* this a bit from how this family of functions worked in
1093	>	* Mach. If you are familiar with that it is a little
1094	>	* different. The main variation that concerns us here is
1095	>	* that code is an array of exception specific codes and
1096	>	* codeCount is a count of the number of codes in the code
1097	>	* array. In typical Mach all exceptions have a code
1098	>	* and sub-code. It happens to be the case that for a
1099	>	* EXC_BAD_ACCESS exception the first entry is the type of
1100	>	* bad access that occurred and the second entry is the
1101	>	* faulting address so these entries correspond exactly to
1102	>	* how the code and sub-code are used on Mach.
1103	>	*
1104	>	* This is a MIG interface. No code in Basilisk II should
1105	>	* call this directley. This has to have external C
1106	>	* linkage because that is what exc_server expects.
1107	>	*/
1108	>	kern_return_t
1109	>	catch_exception_raise(mach_port_t exception_port,
1110	>	mach_port_t thread,
1111	>	mach_port_t task,
1112	>	exception_type_t exception,
1113	>	exception_data_t code,
1114	>	mach_msg_type_number_t codeCount)
1115	>	{
1116	>	ppc_thread_state_t state;
1117	>	kern_return_t krc;
1118	>
1119	>	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
1120	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1121	>	return KERN_SUCCESS;
1122		}
1123	+
1124	+	// In Mach we do not need to remove the exception handler.
1125	+	// If we forward the exception, eventually some exception handler
1126	+	// will take care of this exception.
1127	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1128	+
1129	+	return krc;
1130	+	}
1131	+	#endif
1132	+
1133	+	#ifdef HAVE_SIGSEGV_RECOVERY
1134	+	// Handle bad memory accesses with signal handler
1135	+	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1136	+	{
1137	+	// Call handler and reinstall the global handler, if required
1138	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1139	+	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1140	+	sigsegv_do_install_handler(sig);
1141		#endif
1142	+	return;
1143	+	}
1144
1145	<	if (!fault_recovered) {
497	<	// FAIL: reinstall default handler for "safe" crash
1145	>	// Failure: reinstall default handler for "safe" crash
1146		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1147	<	SIGSEGV_ALL_SIGNALS
1147	>	SIGSEGV_ALL_SIGNALS
1148		#undef FAULT_HANDLER
501	–
502	–	// We can't do anything with the fault_address, dump state?
503	–	if (sigsegv_dump_state != 0)
504	–	sigsegv_dump_state(fault_address, fault_instruction);
505	–	}
1149		}
1150		#endif
1151
#	Line 516 | Line 1159 | static bool sigsegv_do_install_handler(i
1159		{
1160		// Setup SIGSEGV handler to process writes to frame buffer
1161		#ifdef HAVE_SIGACTION
1162	<	struct sigaction vosf_sa;
1163	<	sigemptyset(&vosf_sa.sa_mask);
1164	<	vosf_sa.sa_sigaction = sigsegv_handler;
1165	<	vosf_sa.sa_flags = SA_SIGINFO;
1166	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1162	>	struct sigaction sigsegv_sa;
1163	>	sigemptyset(&sigsegv_sa.sa_mask);
1164	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1165	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1166	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1167		#else
1168		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1169		#endif
#	Line 532 | Line 1175 | static bool sigsegv_do_install_handler(i
1175		{
1176		// Setup SIGSEGV handler to process writes to frame buffer
1177		#ifdef HAVE_SIGACTION
1178	<	struct sigaction vosf_sa;
1179	<	sigemptyset(&vosf_sa.sa_mask);
1180	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1178	>	struct sigaction sigsegv_sa;
1179	>	sigemptyset(&sigsegv_sa.sa_mask);
1180	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1181	>	sigsegv_sa.sa_flags = 0;
1182		#if !EMULATED_68K && defined(__NetBSD__)
1183	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1184	<	vosf_sa.sa_flags = SA_ONSTACK;
541	<	#else
542	<	vosf_sa.sa_flags = 0;
1183	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1184	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1185		#endif
1186	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1186	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1187		#else
1188		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1189		#endif
1190		}
1191		#endif
1192
1193	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
1193	>	#if defined(HAVE_MACH_EXCEPTIONS)
1194	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1195		{
1196	<	#ifdef HAVE_SIGSEGV_RECOVERY
1197	<	sigsegv_user_handler = handler;
1196	>	/*
1197	>	* Except for the exception port functions, this should be
1198	>	* pretty much stock Mach. If later you choose to support
1199	>	* other Mach's besides Darwin, just check for __MACH__
1200	>	* here and __APPLE__ where the actual differences are.
1201	>	*/
1202	>	#if defined(__APPLE__) && defined(__MACH__)
1203	>	if (sigsegv_fault_handler != NULL) {
1204	>	sigsegv_fault_handler = handler;
1205	>	return true;
1206	>	}
1207	>
1208	>	kern_return_t krc;
1209	>
1210	>	// create the the exception port
1211	>	krc = mach_port_allocate(mach_task_self(),
1212	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1213	>	if (krc != KERN_SUCCESS) {
1214	>	mach_error("mach_port_allocate", krc);
1215	>	return false;
1216	>	}
1217	>
1218	>	// add a port send right
1219	>	krc = mach_port_insert_right(mach_task_self(),
1220	>	_exceptionPort, _exceptionPort,
1221	>	MACH_MSG_TYPE_MAKE_SEND);
1222	>	if (krc != KERN_SUCCESS) {
1223	>	mach_error("mach_port_insert_right", krc);
1224	>	return false;
1225	>	}
1226	>
1227	>	// get the old exception ports
1228	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1229	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1230	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1231	>	if (krc != KERN_SUCCESS) {
1232	>	mach_error("thread_get_exception_ports", krc);
1233	>	return false;
1234	>	}
1235	>
1236	>	// set the new exception port
1237	>	//
1238	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1239	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1240	>	// message, but it turns out that in the common case this is not
1241	>	// neccessary. If we need it we can later ask for it from the
1242	>	// suspended thread.
1243	>	//
1244	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1245	>	// counter in the thread state.  The comments in the header file
1246	>	// seem to imply that you can count on the GPR's on an exception
1247	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1248	>	// you have to ask for all of the GPR's anyway just to get the
1249	>	// program counter. In any case because of update effective
1250	>	// address from immediate and update address from effective
1251	>	// addresses of ra and rb modes (as good an name as any for these
1252	>	// addressing modes) used in PPC instructions, you will need the
1253	>	// GPR state anyway.
1254	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1255	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1256	>	if (krc != KERN_SUCCESS) {
1257	>	mach_error("thread_set_exception_ports", krc);
1258	>	return false;
1259	>	}
1260	>
1261	>	// create the exception handler thread
1262	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1263	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1264	>	return false;
1265	>	}
1266	>
1267	>	// do not care about the exception thread any longer, let is run standalone
1268	>	(void)pthread_detach(exc_thread);
1269	>
1270	>	sigsegv_fault_handler = handler;
1271	>	return true;
1272	>	#else
1273	>	return false;
1274	>	#endif
1275	>	}
1276	>	#endif
1277	>
1278	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1279	>	{
1280	>	#if defined(HAVE_SIGSEGV_RECOVERY)
1281		bool success = true;
1282		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1283		SIGSEGV_ALL_SIGNALS
1284		#undef FAULT_HANDLER
1285	+	if (success)
1286	+	sigsegv_fault_handler = handler;
1287		return success;
1288	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1289	+	return sigsegv_do_install_handler(handler);
1290		#else
1291		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1292		return false;
#	Line 570 | Line 1300 | bool sigsegv_install_handler(sigsegv_han
1300
1301		void sigsegv_deinstall_handler(void)
1302		{
1303	+	// We do nothing for Mach exceptions, the thread would need to be
1304	+	// suspended if not already so, and we might mess with other
1305	+	// exception handlers that came after we registered ours. There is
1306	+	// no need to remove the exception handler, in fact this function is
1307	+	// not called anywhere in Basilisk II.
1308		#ifdef HAVE_SIGSEGV_RECOVERY
1309	<	sigsegv_user_handler = 0;
1309	>	sigsegv_fault_handler = 0;
1310		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1311		SIGSEGV_ALL_SIGNALS
1312		#undef FAULT_HANDLER
#	Line 580 | Line 1315 | void sigsegv_deinstall_handler(void)
1315
1316
1317		/*
583	–	*  SIGSEGV ignore state modifier
584	–	*/
585	–
586	–	void sigsegv_set_ignore_state(bool ignore_fault)
587	–	{
588	–	sigsegv_ignore_fault = ignore_fault;
589	–	}
590	–
591	–
592	–	/*
1318		*  Set callback function when we cannot handle the fault
1319		*/
1320
1321	<	void sigsegv_set_dump_state(sigsegv_handler_t handler)
1321	>	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
1322		{
1323	<	sigsegv_dump_state = handler;
1323	>	sigsegv_state_dumper = handler;
1324		}
1325
1326
#	Line 610 | Line 1335 | void sigsegv_set_dump_state(sigsegv_hand
1335		#include <sys/mman.h>
1336		#include "vm_alloc.h"
1337
1338	+	const int REF_INDEX = 123;
1339	+	const int REF_VALUE = 45;
1340	+
1341		static int page_size;
1342		static volatile char * page = 0;
1343		static volatile int handler_called = 0;
1344
1345	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1345	>	#ifdef __GNUC__
1346	>	// Code range where we expect the fault to come from
1347	>	static void *b_region, *e_region;
1348	>	#endif
1349	>
1350	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1351		{
1352		handler_called++;
1353	<	if ((fault_address - 123) != page)
1354	<	exit(1);
1353	>	if ((fault_address - REF_INDEX) != page)
1354	>	exit(10);
1355	>	#ifdef __GNUC__
1356	>	// Make sure reported fault instruction address falls into
1357	>	// expected code range
1358	>	if (instruction_address != SIGSEGV_INVALID_PC
1359	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1360	>	(instruction_address >= (sigsegv_address_t)e_region)))
1361	>	exit(11);
1362	>	#endif
1363		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
1364	<	exit(1);
1365	<	return true;
1364	>	exit(12);
1365	>	return SIGSEGV_RETURN_SUCCESS;
1366		}
1367
1368		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1369	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1369	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1370		{
1371	<	return false;
1371	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1372	>	#ifdef __GNUC__
1373	>	// Make sure reported fault instruction address falls into
1374	>	// expected code range
1375	>	if (instruction_address != SIGSEGV_INVALID_PC
1376	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1377	>	(instruction_address >= (sigsegv_address_t)e_region)))
1378	>	return SIGSEGV_RETURN_FAILURE;
1379	>	#endif
1380	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1381	>	}
1382	>
1383	>	return SIGSEGV_RETURN_FAILURE;
1384	>	}
1385	>
1386	>	// More sophisticated tests for instruction skipper
1387	>	static bool arch_insn_skipper_tests()
1388	>	{
1389	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
1390	>	static const unsigned char code[] = {
1391	>	0x8a, 0x00,                    // mov    (%eax),%al
1392	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
1393	>	0x88, 0x20,                    // mov    %ah,(%eax)
1394	>	0x88, 0x08,                    // mov    %cl,(%eax)
1395	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
1396	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
1397	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
1398	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
1399	>	0x8b, 0x00,                    // mov    (%eax),%eax
1400	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
1401	>	0x89, 0x00,                    // mov    %eax,(%eax)
1402	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
1403	>	#if defined(__x86_64__)
1404	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
1405	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
1406	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
1407	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
1408	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
1409	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
1410	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
1411	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
1412	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
1413	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
1414	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
1415	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
1416	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
1417	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
1418	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
1419	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
1420	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
1421	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
1422	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
1423	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
1424	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
1425	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
1426	>	#endif
1427	>	0                              // end
1428	>	};
1429	>	const int N_REGS = 20;
1430	>	unsigned long regs[N_REGS];
1431	>	for (int i = 0; i < N_REGS; i++)
1432	>	regs[i] = i;
1433	>	const unsigned long start_code = (unsigned long)&code;
1434	>	regs[X86_REG_EIP] = start_code;
1435	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
1436	>	&& ix86_skip_instruction(regs))
1437	>	; /* simply iterate */
1438	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
1439	>	#endif
1440	>	return true;
1441		}
1442		#endif
1443
#	Line 638 | Line 1448 | int main(void)
1448
1449		page_size = getpagesize();
1450		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1451	<	return 1;
1451	>	return 2;
1452
1453	+	memset((void *)page, 0, page_size);
1454		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1455	<	return 1;
1455	>	return 3;
1456
1457		if (!sigsegv_install_handler(sigsegv_test_handler))
1458	<	return 1;
648	<
649	<	page[123] = 45;
650	<	page[123] = 45;
1458	>	return 4;
1459
1460	+	#ifdef __GNUC__
1461	+	b_region = &&L_b_region1;
1462	+	e_region = &&L_e_region1;
1463	+	#endif
1464	+	L_b_region1:
1465	+	page[REF_INDEX] = REF_VALUE;
1466	+	if (page[REF_INDEX] != REF_VALUE)
1467	+	exit(20);
1468	+	page[REF_INDEX] = REF_VALUE;
1469	+	L_e_region1:
1470	+
1471		if (handler_called != 1)
1472	<	return 1;
1472	>	return 5;
1473
1474		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1475		if (!sigsegv_install_handler(sigsegv_insn_handler))
1476	<	return 1;
1476	>	return 6;
1477
1478	<	if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0)
1479	<	return 1;
1478	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
1479	>	return 7;
1480
1481		for (int i = 0; i < page_size; i++)
1482		page[i] = (i + 1) % page_size;
1483
1484		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1485	<	return 1;
1485	>	return 8;
1486
668	–	sigsegv_set_ignore_state(true);
669	–
1487		#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
1488	<	const unsigned int TAG = 0x12345678;                    \
1488	>	const unsigned long TAG = 0x12345678 |                  \
1489	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
1490		TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
1491	<	volatile unsigned int effect = data + TAG;              \
1491	>	volatile unsigned long effect = data + TAG;             \
1492		if (effect != TAG)                                                              \
1493	<	return 1;                                                                       \
1493	>	return 9;                                                                       \
1494		} while (0)
1495
1496	+	#ifdef __GNUC__
1497	+	b_region = &&L_b_region2;
1498	+	e_region = &&L_e_region2;
1499	+	#endif
1500	+	L_b_region2:
1501		TEST_SKIP_INSTRUCTION(unsigned char);
1502		TEST_SKIP_INSTRUCTION(unsigned short);
1503		TEST_SKIP_INSTRUCTION(unsigned int);
1504	+	TEST_SKIP_INSTRUCTION(unsigned long);
1505	+	L_e_region2:
1506		#endif
1507
1508	+	if (!arch_insn_skipper_tests())
1509	+	return 20;
1510	+
1511		vm_exit();
1512		return 0;
1513		}

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