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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.11 by gbeauche, 2002-05-12T13:51:22Z vs.
Revision 1.43 by nigel, 2004-01-20T23:49:32Z

#	Line 4 | Line 4
4		*  Derived from Bruno Haible's work on his SIGSEGV library for clisp
5		*  <http://clisp.sourceforge.net/>
6		*
7	<	*  Basilisk II (C) 1997-2002 Christian Bauer
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) 1997-2004 Christian Bauer
14		*
15		*  This program is free software; you can redistribute it and/or modify
16		*  it under the terms of the GNU General Public License as published by
#	Line 29 | Line 35
35		#include "config.h"
36		#endif
37
38	+	#include <list>
39	+	#include <stdio.h>
40		#include <signal.h>
41		#include "sigsegv.h"
42
43	+	#ifndef NO_STD_NAMESPACE
44	+	using std::list;
45	+	#endif
46	+
47		// Return value type of a signal handler (standard type if not defined)
48		#ifndef RETSIGTYPE
49		#define RETSIGTYPE void
#	Line 40 | Line 52
52		// Type of the system signal handler
53		typedef RETSIGTYPE (*signal_handler)(int);
54
43	–	// Is the fault to be ignored?
44	–	static bool sigsegv_ignore_fault = false;
45	–
55		// User's SIGSEGV handler
56	<	static sigsegv_handler_t sigsegv_user_handler = 0;
56	>	static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
57
58		// Function called to dump state if we can't handle the fault
59	<	static sigsegv_handler_t sigsegv_dump_state = 0;
59	>	static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
60
61		// Actual SIGSEGV handler installer
62		static bool sigsegv_do_install_handler(int sig);
63
64
65		/*
66	+	*  Instruction decoding aids
67	+	*/
68	+
69	+	// Transfer size
70	+	enum transfer_size_t {
71	+	SIZE_UNKNOWN,
72	+	SIZE_BYTE,
73	+	SIZE_WORD, // 2 bytes
74	+	SIZE_LONG, // 4 bytes
75	+	SIZE_QUAD, // 8 bytes
76	+	};
77	+
78	+	// Transfer type
79	+	typedef sigsegv_transfer_type_t transfer_type_t;
80	+
81	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
82	+	// Addressing mode
83	+	enum addressing_mode_t {
84	+	MODE_UNKNOWN,
85	+	MODE_NORM,
86	+	MODE_U,
87	+	MODE_X,
88	+	MODE_UX
89	+	};
90	+
91	+	// Decoded instruction
92	+	struct instruction_t {
93	+	transfer_type_t         transfer_type;
94	+	transfer_size_t         transfer_size;
95	+	addressing_mode_t       addr_mode;
96	+	unsigned int            addr;
97	+	char                            ra, rd;
98	+	};
99	+
100	+	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned int * gpr)
101	+	{
102	+	// Get opcode and divide into fields
103	+	unsigned int opcode = *((unsigned int *)nip);
104	+	unsigned int primop = opcode >> 26;
105	+	unsigned int exop = (opcode >> 1) & 0x3ff;
106	+	unsigned int ra = (opcode >> 16) & 0x1f;
107	+	unsigned int rb = (opcode >> 11) & 0x1f;
108	+	unsigned int rd = (opcode >> 21) & 0x1f;
109	+	signed int imm = (signed short)(opcode & 0xffff);
110	+
111	+	// Analyze opcode
112	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
113	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
114	+	addressing_mode_t addr_mode = MODE_UNKNOWN;
115	+	switch (primop) {
116	+	case 31:
117	+	switch (exop) {
118	+	case 23:        // lwzx
119	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
120	+	case 55:        // lwzux
121	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
122	+	case 87:        // lbzx
123	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
124	+	case 119:       // lbzux
125	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
126	+	case 151:       // stwx
127	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
128	+	case 183:       // stwux
129	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
130	+	case 215:       // stbx
131	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
132	+	case 247:       // stbux
133	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
134	+	case 279:       // lhzx
135	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
136	+	case 311:       // lhzux
137	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
138	+	case 343:       // lhax
139	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
140	+	case 375:       // lhaux
141	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
142	+	case 407:       // sthx
143	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
144	+	case 439:       // sthux
145	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
146	+	}
147	+	break;
148	+
149	+	case 32:        // lwz
150	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
151	+	case 33:        // lwzu
152	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
153	+	case 34:        // lbz
154	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
155	+	case 35:        // lbzu
156	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
157	+	case 36:        // stw
158	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
159	+	case 37:        // stwu
160	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
161	+	case 38:        // stb
162	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
163	+	case 39:        // stbu
164	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
165	+	case 40:        // lhz
166	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
167	+	case 41:        // lhzu
168	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
169	+	case 42:        // lha
170	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
171	+	case 43:        // lhau
172	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
173	+	case 44:        // sth
174	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
175	+	case 45:        // sthu
176	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
177	+	}
178	+
179	+	// Calculate effective address
180	+	unsigned int addr = 0;
181	+	switch (addr_mode) {
182	+	case MODE_X:
183	+	case MODE_UX:
184	+	if (ra == 0)
185	+	addr = gpr[rb];
186	+	else
187	+	addr = gpr[ra] + gpr[rb];
188	+	break;
189	+	case MODE_NORM:
190	+	case MODE_U:
191	+	if (ra == 0)
192	+	addr = (signed int)(signed short)imm;
193	+	else
194	+	addr = gpr[ra] + (signed int)(signed short)imm;
195	+	break;
196	+	default:
197	+	break;
198	+	}
199	+
200	+	// Commit decoded instruction
201	+	instruction->addr = addr;
202	+	instruction->addr_mode = addr_mode;
203	+	instruction->transfer_type = transfer_type;
204	+	instruction->transfer_size = transfer_size;
205	+	instruction->ra = ra;
206	+	instruction->rd = rd;
207	+	}
208	+	#endif
209	+
210	+
211	+	/*
212		*  OS-dependant SIGSEGV signals support section
213		*/
214
#	Line 65 | Line 220 | static bool sigsegv_do_install_handler(i
220		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
221		#endif
222		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
223	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t *sip, void *scp
224	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sip, scp
225		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
226	+	#if (defined(sgi) || defined(__sgi))
227	+	#include <ucontext.h>
228	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
229	+	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)SIGSEGV_CONTEXT_REGS[CTX_EPC]
230	+	#if (defined(mips) || defined(__mips))
231	+	#define SIGSEGV_REGISTER_FILE                   SIGSEGV_CONTEXT_REGS
232	+	#define SIGSEGV_SKIP_INSTRUCTION                mips_skip_instruction
233	+	#endif
234	+	#endif
235	+	#if defined(__sun__)
236	+	#if (defined(sparc) || defined(__sparc__))
237	+	#include <sys/stack.h>
238	+	#include <sys/regset.h>
239	+	#include <sys/ucontext.h>
240	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
241	+	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[REG_PC]
242	+	#define SIGSEGV_SPARC_GWINDOWS                  (((ucontext_t *)scp)->uc_mcontext.gwins)
243	+	#define SIGSEGV_SPARC_RWINDOW                   (struct rwindow *)((char *)SIGSEGV_CONTEXT_REGS[REG_SP] + STACK_BIAS)
244	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)SIGSEGV_CONTEXT_REGS), SIGSEGV_SPARC_GWINDOWS, SIGSEGV_SPARC_RWINDOW
245	+	#define SIGSEGV_SKIP_INSTRUCTION                sparc_skip_instruction
246	+	#endif
247	+	#endif
248	+	#if defined(__FreeBSD__)
249	+	#if (defined(i386) || defined(__i386__))
250	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
251	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
252	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
253	+	#endif
254	+	#endif
255		#if defined(__linux__)
256		#if (defined(i386) || defined(__i386__))
257		#include <sys/ucontext.h>
258	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
259	<	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)(((ucontext_t *)scp)->uc_mcontext.gregs)
258	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
259	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
260	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
261	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
262	>	#endif
263	>	#if (defined(x86_64) || defined(__x86_64__))
264	>	#include <sys/ucontext.h>
265	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
266	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
267	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
268		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
269		#endif
270		#if (defined(ia64) || defined(__ia64__))
#	Line 78 | Line 272 | static bool sigsegv_do_install_handler(i
272		#endif
273		#if (defined(powerpc) || defined(__powerpc__))
274		#include <sys/ucontext.h>
275	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.regs->nip)
275	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
276	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
277	>	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
278	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
279	>	#endif
280	>	#if (defined(hppa) || defined(__hppa__))
281	>	#undef  SIGSEGV_FAULT_ADDRESS
282	>	#define SIGSEGV_FAULT_ADDRESS                   sip->si_ptr
283	>	#endif
284	>	#if (defined(arm) || defined(__arm__))
285	>	#include <asm/ucontext.h> /* use kernel structure, glibc may not be in sync */
286	>	#define SIGSEGV_CONTEXT_REGS                    (((struct ucontext *)scp)->uc_mcontext)
287	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS.arm_pc)
288		#endif
289		#endif
290		#endif
#	Line 90 | Line 296 | static bool sigsegv_do_install_handler(i
296		#if (defined(i386) || defined(__i386__))
297		#include <asm/sigcontext.h>
298		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
299	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
300	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
301	<	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)(&scs)
299	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
300	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
301	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
302	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
303	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)scp
304		#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
305		#endif
306		#if (defined(sparc) || defined(__sparc__))
307		#include <asm/sigcontext.h>
308		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
309	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
310		#define SIGSEGV_FAULT_ADDRESS                   addr
311		#endif
312		#if (defined(powerpc) || defined(__powerpc__))
313		#include <asm/sigcontext.h>
314		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
315	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
316		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
317		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
318	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
319	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
320		#endif
321		#if (defined(alpha) || defined(__alpha__))
322		#include <asm/sigcontext.h>
323		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
324	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
325		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
326		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
327	<
328	<	// From Boehm's GC 6.0alpha8
329	<	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
330	<	{
331	<	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
332	<	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
333	<	fault_address += (signed long)(signed short)(instruction & 0xffff);
121	<	return (sigsegv_address_t)fault_address;
122	<	}
327	>	#endif
328	>	#if (defined(arm) || defined(__arm__))
329	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int r1, int r2, int r3, struct sigcontext sc
330	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
331	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &sc
332	>	#define SIGSEGV_FAULT_ADDRESS                   scp->fault_address
333	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->arm_pc
334		#endif
335		#endif
336
337		// Irix 5 or 6 on MIPS
338	<	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
338	>	#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(_SYSTYPE_SVR4))
339		#include <ucontext.h>
340		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
341	<	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
341	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
342	>	#define SIGSEGV_FAULT_ADDRESS                   (unsigned long)scp->sc_badvaddr
343	>	#define SIGSEGV_FAULT_INSTRUCTION               (unsigned long)scp->sc_pc
344		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
345		#endif
346
347		// HP-UX
348		#if (defined(hpux) || defined(__hpux__))
349		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
350	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
351		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
352		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
353		#endif
#	Line 142 | Line 356 | static sigsegv_address_t get_fault_addre
356		#if defined(__osf__)
357		#include <ucontext.h>
358		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
359	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
360		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
361		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
362		#endif
#	Line 149 | Line 364 | static sigsegv_address_t get_fault_addre
364		// AIX
365		#if defined(_AIX)
366		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
367	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
368		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
369		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
370		#endif
371
372	<	// NetBSD or FreeBSD
373	<	#if defined(__NetBSD__) || defined(__FreeBSD__)
372	>	// NetBSD
373	>	#if defined(__NetBSD__)
374		#if (defined(m68k) || defined(__m68k__))
375		#include <m68k/frame.h>
376		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
377	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
378	<	struct sigstate {                                                                                                                                                                       \
163	<	int ss_flags;                                                                                                                                                                   \
164	<	struct frame ss_frame;                                                                                                                                                  \
165	<	};                                                                                                                                                                                                      \
166	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
167	<	char *fault_addr;                                                                                                                                                                       \
168	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
169	<	case 7:         /* 68040 access error */                                                                                                                                \
170	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
171	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
172	<	break;                                                                                                                                                                                  \
173	<	default:                                                                                                                                                                                        \
174	<	fault_addr = (char *)code;                                                                                                                                              \
175	<	break;                                                                                                                                                                                  \
176	<	}                                                                                                                                                                                                       \
177	<	fault_addr;                                                                                                                                                                                     \
178	<	})
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(SIGSEGV)
380	<	#else
381	<	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
382	<	#define SIGSEGV_FAULT_ADDRESS                   addr
380	>
381	>	// Use decoding scheme from BasiliskII/m68k native
382	>	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
383	>	{
384	>	struct sigstate {
385	>	int ss_flags;
386	>	struct frame ss_frame;
387	>	};
388	>	struct sigstate *state = (struct sigstate *)scp->sc_ap;
389	>	char *fault_addr;
390	>	switch (state->ss_frame.f_format) {
391	>	case 7:         /* 68040 access error */
392	>	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
393	>	fault_addr = state->ss_frame.f_fmt7.f_fa;
394	>	break;
395	>	default:
396	>	fault_addr = (char *)code;
397	>	break;
398	>	}
399	>	return (sigsegv_address_t)fault_addr;
400	>	}
401	>	#endif
402	>	#if (defined(alpha) || defined(__alpha__))
403	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
404	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
405	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
406	>	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
407	>	#endif
408	>	#if (defined(i386) || defined(__i386__))
409	>	#error "FIXME: need to decode instruction and compute EA"
410	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
411	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
412	>	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
413	>	#endif
414	>	#endif
415	>	#if defined(__FreeBSD__)
416	>	#if (defined(i386) || defined(__i386__))
417		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
418	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
419	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
420	+	#define SIGSEGV_FAULT_ADDRESS                   addr
421	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_eip
422	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned long *)&scp->sc_edi)
423	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
424		#endif
425	+	#if (defined(alpha) || defined(__alpha__))
426	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
427	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, char *addr, struct sigcontext *scp
428	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, addr, scp
429	+	#define SIGSEGV_FAULT_ADDRESS                   addr
430	+	#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
431	+	#endif
432	+	#endif
433	+
434	+	// Extract fault address out of a sigcontext
435	+	#if (defined(alpha) || defined(__alpha__))
436	+	// From Boehm's GC 6.0alpha8
437	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
438	+	{
439	+	unsigned int instruction = *((unsigned int *)(scp->sc_pc));
440	+	unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
441	+	fault_address += (signed long)(signed short)(instruction & 0xffff);
442	+	return (sigsegv_address_t)fault_address;
443	+	}
444		#endif
445
446	<	// MacOS X
446	>
447	>	// MacOS X, not sure which version this works in. Under 10.1
448	>	// vm_protect does not appear to work from a signal handler. Under
449	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
450	>	// field is the address of the faulting instruction and not the
451	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
452	>	// case with Mach exception handlers there is a way to do what this
453	>	// was meant to do.
454	>	#ifndef HAVE_MACH_EXCEPTIONS
455		#if defined(__APPLE__) && defined(__MACH__)
456		#if (defined(ppc) || defined(__ppc__))
457		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
458	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
459		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
460		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
461		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
462	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
463	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
464
465	<	// From Boehm's GC 6.0alpha8
196	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
197	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
198	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
199	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
200	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
201	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
202	<
465	>	// Use decoding scheme from SheepShaver
466		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
467		{
468	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
469	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
470	<	int            disp = 0, tmp;
471	<	unsigned int   baseA = 0, baseB = 0;
472	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
473	<
474	<	switch(EXTRACT_OP1(instr)) {
475	<	case 38:   /* stb */
476	<	case 39:   /* stbu */
477	<	case 54:   /* stfd */
478	<	case 55:   /* stfdu */
479	<	case 52:   /* stfs */
480	<	case 53:   /* stfsu */
481	<	case 44:   /* sth */
482	<	case 45:   /* sthu */
483	<	case 47:   /* stmw */
484	<	case 36:   /* stw */
485	<	case 37:   /* stwu */
486	<	tmp = EXTRACT_REGA(instr);
487	<	if(tmp > 0)
488	<	baseA = regs[tmp];
489	<	disp = EXTRACT_DISP(instr);
490	<	break;
491	<	case 31:
492	<	switch(EXTRACT_OP2(instr)) {
493	<	case 86:    /* dcbf */
494	<	case 54:    /* dcbst */
495	<	case 1014:  /* dcbz */
496	<	case 247:   /* stbux */
497	<	case 215:   /* stbx */
498	<	case 759:   /* stfdux */
499	<	case 727:   /* stfdx */
500	<	case 983:   /* stfiwx */
501	<	case 695:   /* stfsux */
502	<	case 663:   /* stfsx */
503	<	case 918:   /* sthbrx */
504	<	case 439:   /* sthux */
505	<	case 407:   /* sthx */
506	<	case 661:   /* stswx */
507	<	case 662:   /* stwbrx */
508	<	case 150:   /* stwcx. */
509	<	case 183:   /* stwux */
510	<	case 151:   /* stwx */
511	<	case 135:   /* stvebx */
512	<	case 167:   /* stvehx */
513	<	case 199:   /* stvewx */
514	<	case 231:   /* stvx */
515	<	case 487:   /* stvxl */
516	<	tmp = EXTRACT_REGA(instr);
517	<	if(tmp > 0)
518	<	baseA = regs[tmp];
519	<	baseB = regs[EXTRACT_REGC(instr)];
520	<	/* determine Altivec alignment mask */
521	<	switch(EXTRACT_OP2(instr)) {
522	<	case 167:   /* stvehx */
523	<	alignmask = 0xFFFFFFFE;
524	<	break;
525	<	case 199:   /* stvewx */
526	<	alignmask = 0xFFFFFFFC;
527	<	break;
528	<	case 231:   /* stvx */
529	<	alignmask = 0xFFFFFFF0;
530	<	break;
531	<	case 487:  /* stvxl */
532	<	alignmask = 0xFFFFFFF0;
533	<	break;
534	<	}
535	<	break;
536	<	case 725:   /* stswi */
537	<	tmp = EXTRACT_REGA(instr);
538	<	if(tmp > 0)
539	<	baseA = regs[tmp];
540	<	break;
541	<	default:   /* ignore instruction */
542	<	return 0;
543	<	break;
468	>	unsigned int   nip = (unsigned int) scp->sc_ir;
469	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
470	>	instruction_t  instr;
471	>
472	>	powerpc_decode_instruction(&instr, nip, gpr);
473	>	return (sigsegv_address_t)instr.addr;
474	>	}
475	>	#endif
476	>	#endif
477	>	#endif
478	>	#endif
479	>
480	>	#if HAVE_MACH_EXCEPTIONS
481	>
482	>	// This can easily be extended to other Mach systems, but really who
483	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
484	>	// Mach 2.5/3.0?
485	>	#if defined(__APPLE__) && defined(__MACH__)
486	>
487	>	#include <sys/types.h>
488	>	#include <stdlib.h>
489	>	#include <stdio.h>
490	>	#include <pthread.h>
491	>
492	>	/*
493	>	* If you are familiar with MIG then you will understand the frustration
494	>	* that was necessary to get these embedded into C++ code by hand.
495	>	*/
496	>	extern "C" {
497	>	#include <mach/mach.h>
498	>	#include <mach/mach_error.h>
499	>
500	>	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
501	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
502	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
503	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
504	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
505	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
506	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
507	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
508	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
509	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
510	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
511	>	}
512	>
513	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
514	>	#define HANDLER_COUNT 64
515	>
516	>	// structure to tuck away existing exception handlers
517	>	typedef struct _ExceptionPorts {
518	>	mach_msg_type_number_t maskCount;
519	>	exception_mask_t masks[HANDLER_COUNT];
520	>	exception_handler_t handlers[HANDLER_COUNT];
521	>	exception_behavior_t behaviors[HANDLER_COUNT];
522	>	thread_state_flavor_t flavors[HANDLER_COUNT];
523	>	} ExceptionPorts;
524	>
525	>	// exception handler thread
526	>	static pthread_t exc_thread;
527	>
528	>	// place where old exception handler info is stored
529	>	static ExceptionPorts ports;
530	>
531	>	// our exception port
532	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
533	>
534	>	#define MACH_CHECK_ERROR(name,ret) \
535	>	if (ret != KERN_SUCCESS) { \
536	>	mach_error(#name, ret); \
537	>	exit (1); \
538	>	}
539	>
540	>	#define SIGSEGV_FAULT_ADDRESS                   code[1]
541	>	#define SIGSEGV_FAULT_INSTRUCTION               get_fault_instruction(thread, state)
542	>	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  ((code[0] == KERN_PROTECTION_FAILURE) ? sigsegv_fault_handler(ADDR, IP) : SIGSEGV_RETURN_FAILURE)
543	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
544	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
545	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
546	>	#define SIGSEGV_REGISTER_FILE                   &state->srr0, &state->r0
547	>
548	>	// Given a suspended thread, stuff the current instruction and
549	>	// registers into state.
550	>	//
551	>	// It would have been nice to have this be ppc/x86 independant which
552	>	// could have been done easily with a thread_state_t instead of
553	>	// ppc_thread_state_t, but because of the way this is called it is
554	>	// easier to do it this way.
555	>	#if (defined(ppc) || defined(__ppc__))
556	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
557	>	{
558	>	kern_return_t krc;
559	>	mach_msg_type_number_t count;
560	>
561	>	count = MACHINE_THREAD_STATE_COUNT;
562	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
563	>	MACH_CHECK_ERROR (thread_get_state, krc);
564	>
565	>	return (sigsegv_address_t)state->srr0;
566	>	}
567	>	#endif
568	>
569	>	// Since there can only be one exception thread running at any time
570	>	// this is not a problem.
571	>	#define MSG_SIZE 512
572	>	static char msgbuf[MSG_SIZE];
573	>	static char replybuf[MSG_SIZE];
574	>
575	>	/*
576	>	* This is the entry point for the exception handler thread. The job
577	>	* of this thread is to wait for exception messages on the exception
578	>	* port that was setup beforehand and to pass them on to exc_server.
579	>	* exc_server is a MIG generated function that is a part of Mach.
580	>	* Its job is to decide what to do with the exception message. In our
581	>	* case exc_server calls catch_exception_raise on our behalf. After
582	>	* exc_server returns, it is our responsibility to send the reply.
583	>	*/
584	>	static void *
585	>	handleExceptions(void *priv)
586	>	{
587	>	mach_msg_header_t *msg, *reply;
588	>	kern_return_t krc;
589	>
590	>	msg = (mach_msg_header_t *)msgbuf;
591	>	reply = (mach_msg_header_t *)replybuf;
592	>
593	>	for (;;) {
594	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
595	>	_exceptionPort, 0, MACH_PORT_NULL);
596	>	MACH_CHECK_ERROR(mach_msg, krc);
597	>
598	>	if (!exc_server(msg, reply)) {
599	>	fprintf(stderr, "exc_server hated the message\n");
600	>	exit(1);
601	>	}
602	>
603	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
604	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
605	>	if (krc != KERN_SUCCESS) {
606	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
607	>	krc, mach_error_string(krc));
608	>	exit(1);
609		}
282	–	break;
283	–	default:   /* ignore instruction */
284	–	return 0;
285	–	break;
610		}
287	–
288	–	addr = (baseA + baseB) + disp;
289	–	addr &= alignmask;
290	–	return (sigsegv_address_t)addr;
611		}
612		#endif
613		#endif
614	<	#endif
614	>
615	>
616	>	/*
617	>	*  Instruction skipping
618	>	*/
619
620		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
621		// Decode and skip X86 instruction
622	<	#if (defined(i386) || defined(__i386__))
622	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
623		#if defined(__linux__)
624		enum {
625	+	#if (defined(i386) || defined(__i386__))
626		X86_REG_EIP = 14,
627		X86_REG_EAX = 11,
628		X86_REG_ECX = 10,
#	Line 307 | Line 632 | enum {
632		X86_REG_EBP = 6,
633		X86_REG_ESI = 5,
634		X86_REG_EDI = 4
635	+	#endif
636	+	#if defined(__x86_64__)
637	+	X86_REG_R8  = 0,
638	+	X86_REG_R9  = 1,
639	+	X86_REG_R10 = 2,
640	+	X86_REG_R11 = 3,
641	+	X86_REG_R12 = 4,
642	+	X86_REG_R13 = 5,
643	+	X86_REG_R14 = 6,
644	+	X86_REG_R15 = 7,
645	+	X86_REG_EDI = 8,
646	+	X86_REG_ESI = 9,
647	+	X86_REG_EBP = 10,
648	+	X86_REG_EBX = 11,
649	+	X86_REG_EDX = 12,
650	+	X86_REG_EAX = 13,
651	+	X86_REG_ECX = 14,
652	+	X86_REG_ESP = 15,
653	+	X86_REG_EIP = 16
654	+	#endif
655	+	};
656	+	#endif
657	+	#if defined(__NetBSD__) || defined(__FreeBSD__)
658	+	enum {
659	+	#if (defined(i386) || defined(__i386__))
660	+	X86_REG_EIP = 10,
661	+	X86_REG_EAX = 7,
662	+	X86_REG_ECX = 6,
663	+	X86_REG_EDX = 5,
664	+	X86_REG_EBX = 4,
665	+	X86_REG_ESP = 13,
666	+	X86_REG_EBP = 2,
667	+	X86_REG_ESI = 1,
668	+	X86_REG_EDI = 0
669	+	#endif
670		};
671		#endif
672		// FIXME: this is partly redundant with the instruction decoding phase
#	Line 343 | Line 703 | static inline int ix86_step_over_modrm(u
703		return offset;
704		}
705
706	<	static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs)
706	>	static bool ix86_skip_instruction(unsigned long * regs)
707		{
708	<	unsigned char * eip = (unsigned char *)fault_instruction;
708	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
709
710		if (eip == 0)
711		return false;
712
713	<	// Transfer type
714	<	enum {
355	<	TYPE_UNKNOWN,
356	<	TYPE_LOAD,
357	<	TYPE_STORE
358	<	} transfer_type = TYPE_UNKNOWN;
359	<
360	<	// Transfer size
361	<	enum {
362	<	SIZE_BYTE,
363	<	SIZE_WORD,
364	<	SIZE_LONG
365	<	} transfer_size = SIZE_LONG;
713	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
714	>	transfer_size_t transfer_size = SIZE_LONG;
715
716		int reg = -1;
717		int len = 0;
718	<
718	>
719	>	#if DEBUG
720	>	printf("IP: %p [%02x %02x %02x %02x...]\n",
721	>	eip, eip[0], eip[1], eip[2], eip[3]);
722	>	#endif
723	>
724		// Operand size prefix
725		if (*eip == 0x66) {
726		eip++;
#	Line 374 | Line 728 | static bool ix86_skip_instruction(sigseg
728		transfer_size = SIZE_WORD;
729		}
730
731	+	// REX prefix
732	+	#if defined(__x86_64__)
733	+	struct rex_t {
734	+	unsigned char W;
735	+	unsigned char R;
736	+	unsigned char X;
737	+	unsigned char B;
738	+	};
739	+	rex_t rex = { 0, 0, 0, 0 };
740	+	bool has_rex = false;
741	+	if ((*eip & 0xf0) == 0x40) {
742	+	has_rex = true;
743	+	const unsigned char b = *eip;
744	+	rex.W = b & (1 << 3);
745	+	rex.R = b & (1 << 2);
746	+	rex.X = b & (1 << 1);
747	+	rex.B = b & (1 << 0);
748	+	#if DEBUG
749	+	printf("REX: %c,%c,%c,%c\n",
750	+	rex.W ? 'W' : '_',
751	+	rex.R ? 'R' : '_',
752	+	rex.X ? 'X' : '_',
753	+	rex.B ? 'B' : '_');
754	+	#endif
755	+	eip++;
756	+	len++;
757	+	if (rex.W)
758	+	transfer_size = SIZE_QUAD;
759	+	}
760	+	#else
761	+	const bool has_rex = false;
762	+	#endif
763	+
764		// Decode instruction
765		switch (eip[0]) {
766	+	case 0x0f:
767	+	switch (eip[1]) {
768	+	case 0xb6: // MOVZX r32, r/m8
769	+	case 0xb7: // MOVZX r32, r/m16
770	+	switch (eip[2] & 0xc0) {
771	+	case 0x80:
772	+	reg = (eip[2] >> 3) & 7;
773	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
774	+	break;
775	+	case 0x40:
776	+	reg = (eip[2] >> 3) & 7;
777	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
778	+	break;
779	+	case 0x00:
780	+	reg = (eip[2] >> 3) & 7;
781	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
782	+	break;
783	+	}
784	+	len += 3 + ix86_step_over_modrm(eip + 2);
785	+	break;
786	+	}
787	+	break;
788		case 0x8a: // MOV r8, r/m8
789		transfer_size = SIZE_BYTE;
790		case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
791		switch (eip[1] & 0xc0) {
792		case 0x80:
793		reg = (eip[1] >> 3) & 7;
794	<	transfer_type = TYPE_LOAD;
794	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
795		break;
796		case 0x40:
797		reg = (eip[1] >> 3) & 7;
798	<	transfer_type = TYPE_LOAD;
798	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
799		break;
800		case 0x00:
801		reg = (eip[1] >> 3) & 7;
802	<	transfer_type = TYPE_LOAD;
802	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
803		break;
804		}
805		len += 2 + ix86_step_over_modrm(eip + 1);
#	Line 401 | Line 810 | static bool ix86_skip_instruction(sigseg
810		switch (eip[1] & 0xc0) {
811		case 0x80:
812		reg = (eip[1] >> 3) & 7;
813	<	transfer_type = TYPE_STORE;
813	>	transfer_type = SIGSEGV_TRANSFER_STORE;
814		break;
815		case 0x40:
816		reg = (eip[1] >> 3) & 7;
817	<	transfer_type = TYPE_STORE;
817	>	transfer_type = SIGSEGV_TRANSFER_STORE;
818		break;
819		case 0x00:
820		reg = (eip[1] >> 3) & 7;
821	<	transfer_type = TYPE_STORE;
821	>	transfer_type = SIGSEGV_TRANSFER_STORE;
822		break;
823		}
824		len += 2 + ix86_step_over_modrm(eip + 1);
825		break;
826		}
827
828	<	if (transfer_type == TYPE_UNKNOWN) {
828	>	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
829		// Unknown machine code, let it crash. Then patch the decoder
830		return false;
831		}
832
833	<	if (transfer_type == TYPE_LOAD && reg != -1) {
834	<	static const int x86_reg_map[8] = {
833	>	#if defined(__x86_64__)
834	>	if (rex.R)
835	>	reg += 8;
836	>	#endif
837	>
838	>	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
839	>	static const int x86_reg_map[] = {
840		X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
841	<	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
841	>	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI,
842	>	#if defined(__x86_64__)
843	>	X86_REG_R8,  X86_REG_R9,  X86_REG_R10, X86_REG_R11,
844	>	X86_REG_R12, X86_REG_R13, X86_REG_R14, X86_REG_R15,
845	>	#endif
846		};
847
848	<	if (reg < 0 || reg >= 8)
848	>	if (reg < 0 || reg >= (sizeof(x86_reg_map)/sizeof(x86_reg_map[0]) - 1))
849		return false;
850
851	+	// Set 0 to the relevant register part
852	+	// NOTE: this is only valid for MOV alike instructions
853		int rloc = x86_reg_map[reg];
854		switch (transfer_size) {
855		case SIZE_BYTE:
856	<	regs[rloc] = (regs[rloc] & ~0xff);
856	>	if (has_rex || reg < 4)
857	>	regs[rloc] = (regs[rloc] & ~0x00ffL);
858	>	else {
859	>	rloc = x86_reg_map[reg - 4];
860	>	regs[rloc] = (regs[rloc] & ~0xff00L);
861	>	}
862		break;
863		case SIZE_WORD:
864	<	regs[rloc] = (regs[rloc] & ~0xffff);
864	>	regs[rloc] = (regs[rloc] & ~0xffffL);
865		break;
866		case SIZE_LONG:
867	+	case SIZE_QUAD: // zero-extension
868		regs[rloc] = 0;
869		break;
870		}
#	Line 446 | Line 872 | static bool ix86_skip_instruction(sigseg
872
873		#if DEBUG
874		printf("%08x: %s %s access", regs[X86_REG_EIP],
875	<	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
876	<	transfer_type == TYPE_LOAD ? "read" : "write");
875	>	transfer_size == SIZE_BYTE ? "byte" :
876	>	transfer_size == SIZE_WORD ? "word" :
877	>	transfer_size == SIZE_LONG ? "long" :
878	>	transfer_size == SIZE_QUAD ? "quad" : "unknown",
879	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
880
881		if (reg != -1) {
882	<	static const char * x86_reg_str_map[8] = {
883	<	"eax", "ecx", "edx", "ebx",
884	<	"esp", "ebp", "esi", "edi"
882	>	static const char * x86_byte_reg_str_map[] = {
883	>	"al",   "cl",   "dl",   "bl",
884	>	"spl",  "bpl",  "sil",  "dil",
885	>	"r8b",  "r9b",  "r10b", "r11b",
886	>	"r12b", "r13b", "r14b", "r15b",
887	>	"ah",   "ch",   "dh",   "bh",
888	>	};
889	>	static const char * x86_word_reg_str_map[] = {
890	>	"ax",   "cx",   "dx",   "bx",
891	>	"sp",   "bp",   "si",   "di",
892	>	"r8w",  "r9w",  "r10w", "r11w",
893	>	"r12w", "r13w", "r14w", "r15w",
894	>	};
895	>	static const char *x86_long_reg_str_map[] = {
896	>	"eax",  "ecx",  "edx",  "ebx",
897	>	"esp",  "ebp",  "esi",  "edi",
898	>	"r8d",  "r9d",  "r10d", "r11d",
899	>	"r12d", "r13d", "r14d", "r15d",
900		};
901	<	printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]);
901	>	static const char *x86_quad_reg_str_map[] = {
902	>	"rax", "rcx", "rdx", "rbx",
903	>	"rsp", "rbp", "rsi", "rdi",
904	>	"r8",  "r9",  "r10", "r11",
905	>	"r12", "r13", "r14", "r15",
906	>	};
907	>	const char * reg_str = NULL;
908	>	switch (transfer_size) {
909	>	case SIZE_BYTE:
910	>	reg_str = x86_byte_reg_str_map[(!has_rex && reg >= 4 ? 12 : 0) + reg];
911	>	break;
912	>	case SIZE_WORD: reg_str = x86_word_reg_str_map[reg]; break;
913	>	case SIZE_LONG: reg_str = x86_long_reg_str_map[reg]; break;
914	>	case SIZE_QUAD: reg_str = x86_quad_reg_str_map[reg]; break;
915	>	}
916	>	if (reg_str)
917	>	printf(" %s register %%%s",
918	>	transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from",
919	>	reg_str);
920		}
921		printf(", %d bytes instruction\n", len);
922		#endif
#	Line 463 | Line 925 | static bool ix86_skip_instruction(sigseg
925		return true;
926		}
927		#endif
928	+
929	+	// Decode and skip PPC instruction
930	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
931	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
932	+	{
933	+	instruction_t instr;
934	+	powerpc_decode_instruction(&instr, *nip_p, regs);
935	+
936	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
937	+	// Unknown machine code, let it crash. Then patch the decoder
938	+	return false;
939	+	}
940	+
941	+	#if DEBUG
942	+	printf("%08x: %s %s access", *nip_p,
943	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
944	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
945	+
946	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
947	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
948	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
949	+	printf(" r%d (rd = 0)\n", instr.rd);
950	+	#endif
951	+
952	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
953	+	regs[instr.ra] = instr.addr;
954	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
955	+	regs[instr.rd] = 0;
956	+
957	+	*nip_p += 4;
958	+	return true;
959	+	}
960	+	#endif
961	+
962	+	// Decode and skip MIPS instruction
963	+	#if (defined(mips) || defined(__mips))
964	+	enum {
965	+	#if (defined(sgi) || defined(__sgi))
966	+	MIPS_REG_EPC = 35,
967	+	#endif
968	+	};
969	+	static bool mips_skip_instruction(greg_t * regs)
970	+	{
971	+	unsigned int * epc = (unsigned int *)(unsigned long)regs[MIPS_REG_EPC];
972	+
973	+	if (epc == 0)
974	+	return false;
975	+
976	+	#if DEBUG
977	+	printf("IP: %p [%08x]\n", epc, epc[0]);
978	+	#endif
979	+
980	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
981	+	transfer_size_t transfer_size = SIZE_LONG;
982	+	int direction = 0;
983	+
984	+	const unsigned int opcode = epc[0];
985	+	switch (opcode >> 26) {
986	+	case 32: // Load Byte
987	+	case 36: // Load Byte Unsigned
988	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
989	+	transfer_size = SIZE_BYTE;
990	+	break;
991	+	case 33: // Load Halfword
992	+	case 37: // Load Halfword Unsigned
993	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
994	+	transfer_size = SIZE_WORD;
995	+	break;
996	+	case 35: // Load Word
997	+	case 39: // Load Word Unsigned
998	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
999	+	transfer_size = SIZE_LONG;
1000	+	break;
1001	+	case 34: // Load Word Left
1002	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1003	+	transfer_size = SIZE_LONG;
1004	+	direction = -1;
1005	+	break;
1006	+	case 38: // Load Word Right
1007	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1008	+	transfer_size = SIZE_LONG;
1009	+	direction = 1;
1010	+	break;
1011	+	case 55: // Load Doubleword
1012	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1013	+	transfer_size = SIZE_QUAD;
1014	+	break;
1015	+	case 26: // Load Doubleword Left
1016	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1017	+	transfer_size = SIZE_QUAD;
1018	+	direction = -1;
1019	+	break;
1020	+	case 27: // Load Doubleword Right
1021	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1022	+	transfer_size = SIZE_QUAD;
1023	+	direction = 1;
1024	+	break;
1025	+	case 40: // Store Byte
1026	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1027	+	transfer_size = SIZE_BYTE;
1028	+	break;
1029	+	case 41: // Store Halfword
1030	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1031	+	transfer_size = SIZE_WORD;
1032	+	break;
1033	+	case 43: // Store Word
1034	+	case 42: // Store Word Left
1035	+	case 46: // Store Word Right
1036	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1037	+	transfer_size = SIZE_LONG;
1038	+	break;
1039	+	case 63: // Store Doubleword
1040	+	case 44: // Store Doubleword Left
1041	+	case 45: // Store Doubleword Right
1042	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1043	+	transfer_size = SIZE_QUAD;
1044	+	break;
1045	+	/* Misc instructions unlikely to be used within CPU emulators */
1046	+	case 48: // Load Linked Word
1047	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1048	+	transfer_size = SIZE_LONG;
1049	+	break;
1050	+	case 52: // Load Linked Doubleword
1051	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1052	+	transfer_size = SIZE_QUAD;
1053	+	break;
1054	+	case 56: // Store Conditional Word
1055	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1056	+	transfer_size = SIZE_LONG;
1057	+	break;
1058	+	case 60: // Store Conditional Doubleword
1059	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1060	+	transfer_size = SIZE_QUAD;
1061	+	break;
1062	+	}
1063	+
1064	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1065	+	// Unknown machine code, let it crash. Then patch the decoder
1066	+	return false;
1067	+	}
1068	+
1069	+	// Zero target register in case of a load operation
1070	+	const int reg = (opcode >> 16) & 0x1f;
1071	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD) {
1072	+	if (direction == 0)
1073	+	regs[reg] = 0;
1074	+	else {
1075	+	// FIXME: untested code
1076	+	unsigned long ea = regs[(opcode >> 21) & 0x1f];
1077	+	ea += (signed long)(signed int)(signed short)(opcode & 0xffff);
1078	+	const int offset = ea & (transfer_size == SIZE_LONG ? 3 : 7);
1079	+	unsigned long value;
1080	+	if (direction > 0) {
1081	+	const unsigned long rmask = ~((1L << ((offset + 1) * 8)) - 1);
1082	+	value = regs[reg] & rmask;
1083	+	}
1084	+	else {
1085	+	const unsigned long lmask = (1L << (offset * 8)) - 1;
1086	+	value = regs[reg] & lmask;
1087	+	}
1088	+	// restore most significant bits
1089	+	if (transfer_size == SIZE_LONG)
1090	+	value = (signed long)(signed int)value;
1091	+	regs[reg] = value;
1092	+	}
1093	+	}
1094	+
1095	+	#if DEBUG
1096	+	#if (defined(_ABIN32) || defined(_ABI64))
1097	+	static const char * mips_gpr_names[32] = {
1098	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1099	+	"t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7",
1100	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1101	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1102	+	};
1103	+	#else
1104	+	static const char * mips_gpr_names[32] = {
1105	+	"zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3",
1106	+	"a4",   "a5",   "a6",   "a7",   "t0",   "t1",   "t2",   "t3",
1107	+	"s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7",
1108	+	"t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "s8",   "ra"
1109	+	};
1110	+	#endif
1111	+	printf("%s %s register %s\n",
1112	+	transfer_size == SIZE_BYTE ? "byte" :
1113	+	transfer_size == SIZE_WORD ? "word" :
1114	+	transfer_size == SIZE_LONG ? "long" :
1115	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1116	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1117	+	mips_gpr_names[reg]);
1118	+	#endif
1119	+
1120	+	regs[MIPS_REG_EPC] += 4;
1121	+	return true;
1122	+	}
1123	+	#endif
1124	+
1125	+	// Decode and skip SPARC instruction
1126	+	#if (defined(sparc) || defined(__sparc__))
1127	+	enum {
1128	+	#if (defined(__sun__))
1129	+	SPARC_REG_G1 = REG_G1,
1130	+	SPARC_REG_O0 = REG_O0,
1131	+	SPARC_REG_PC = REG_PC,
1132	+	#endif
1133	+	};
1134	+	static bool sparc_skip_instruction(unsigned long * regs, gwindows_t * gwins, struct rwindow * rwin)
1135	+	{
1136	+	unsigned int * pc = (unsigned int *)regs[SPARC_REG_PC];
1137	+
1138	+	if (pc == 0)
1139	+	return false;
1140	+
1141	+	#if DEBUG
1142	+	printf("IP: %p [%08x]\n", pc, pc[0]);
1143	+	#endif
1144	+
1145	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
1146	+	transfer_size_t transfer_size = SIZE_LONG;
1147	+	bool register_pair = false;
1148	+
1149	+	const unsigned int opcode = pc[0];
1150	+	if ((opcode >> 30) != 3)
1151	+	return false;
1152	+	switch ((opcode >> 19) & 0x3f) {
1153	+	case 9: // Load Signed Byte
1154	+	case 1: // Load Unsigned Byte
1155	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1156	+	transfer_size = SIZE_BYTE;
1157	+	break;
1158	+	case 10:// Load Signed Halfword
1159	+	case 2: // Load Unsigned Word
1160	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1161	+	transfer_size = SIZE_WORD;
1162	+	break;
1163	+	case 8: // Load Word
1164	+	case 0: // Load Unsigned Word
1165	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1166	+	transfer_size = SIZE_LONG;
1167	+	break;
1168	+	case 11:// Load Extended Word
1169	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1170	+	transfer_size = SIZE_QUAD;
1171	+	break;
1172	+	case 3: // Load Doubleword
1173	+	transfer_type = SIGSEGV_TRANSFER_LOAD;
1174	+	transfer_size = SIZE_LONG;
1175	+	register_pair = true;
1176	+	break;
1177	+	case 5: // Store Byte
1178	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1179	+	transfer_size = SIZE_BYTE;
1180	+	break;
1181	+	case 6: // Store Halfword
1182	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1183	+	transfer_size = SIZE_WORD;
1184	+	break;
1185	+	case 4: // Store Word
1186	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1187	+	transfer_size = SIZE_LONG;
1188	+	break;
1189	+	case 14:// Store Extended Word
1190	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1191	+	transfer_size = SIZE_QUAD;
1192	+	break;
1193	+	case 7: // Store Doubleword
1194	+	transfer_type = SIGSEGV_TRANSFER_STORE;
1195	+	transfer_size = SIZE_WORD;
1196	+	register_pair = true;
1197	+	break;
1198	+	}
1199	+
1200	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
1201	+	// Unknown machine code, let it crash. Then patch the decoder
1202	+	return false;
1203	+	}
1204	+
1205	+	// Zero target register in case of a load operation
1206	+	const int reg = (opcode >> 25) & 0x1f;
1207	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != 0) {
1208	+	// FIXME: code to handle local & input registers is not tested
1209	+	if (reg >= 1 && reg <= 7) {
1210	+	// global registers
1211	+	regs[reg - 1 + SPARC_REG_G1] = 0;
1212	+	}
1213	+	else if (reg >= 8 && reg <= 15) {
1214	+	// output registers
1215	+	regs[reg - 8 + SPARC_REG_O0] = 0;
1216	+	}
1217	+	else if (reg >= 16 && reg <= 23) {
1218	+	// local registers (in register windows)
1219	+	if (gwins)
1220	+	gwins->wbuf->rw_local[reg - 16] = 0;
1221	+	else
1222	+	rwin->rw_local[reg - 16] = 0;
1223	+	}
1224	+	else {
1225	+	// input registers (in register windows)
1226	+	if (gwins)
1227	+	gwins->wbuf->rw_in[reg - 24] = 0;
1228	+	else
1229	+	rwin->rw_in[reg - 24] = 0;
1230	+	}
1231	+	}
1232	+
1233	+	#if DEBUG
1234	+	static const char * reg_names[] = {
1235	+	"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
1236	+	"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
1237	+	"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
1238	+	"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
1239	+	};
1240	+	printf("%s %s register %s\n",
1241	+	transfer_size == SIZE_BYTE ? "byte" :
1242	+	transfer_size == SIZE_WORD ? "word" :
1243	+	transfer_size == SIZE_LONG ? "long" :
1244	+	transfer_size == SIZE_QUAD ? "quad" : "unknown",
1245	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "load to" : "store from",
1246	+	reg_names[reg]);
1247	+	#endif
1248	+
1249	+	regs[SPARC_REG_PC] += 4;
1250	+	return true;
1251	+	}
1252	+	#endif
1253		#endif
1254
1255		// Fallbacks
1256		#ifndef SIGSEGV_FAULT_INSTRUCTION
1257		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
1258		#endif
1259	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
1260	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
1261	+	#endif
1262	+	#ifndef SIGSEGV_FAULT_HANDLER_INVOKE
1263	+	#define SIGSEGV_FAULT_HANDLER_INVOKE(ADDR, IP)  sigsegv_fault_handler(ADDR, IP)
1264	+	#endif
1265
1266		// SIGSEGV recovery supported ?
1267		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 480 | Line 1273 | static bool ix86_skip_instruction(sigseg
1273		*  SIGSEGV global handler
1274		*/
1275
1276	<	#ifdef HAVE_SIGSEGV_RECOVERY
1277	<	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1276	>	#if defined(HAVE_SIGSEGV_RECOVERY) || defined(HAVE_MACH_EXCEPTIONS)
1277	>	// This function handles the badaccess to memory.
1278	>	// It is called from the signal handler or the exception handler.
1279	>	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
1280		{
1281		sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
1282		sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
488	–	bool fault_recovered = false;
1283
1284		// Call user's handler and reinstall the global handler, if required
1285	<	if (sigsegv_user_handler(fault_address, fault_instruction)) {
1286	<	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1287	<	sigsegv_do_install_handler(sig);
1285	>	switch (SIGSEGV_FAULT_HANDLER_INVOKE(fault_address, fault_instruction)) {
1286	>	case SIGSEGV_RETURN_SUCCESS:
1287	>	return true;
1288	>
1289	>	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1290	>	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
1291	>	// Call the instruction skipper with the register file
1292	>	// available
1293	>	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
1294	>	#ifdef HAVE_MACH_EXCEPTIONS
1295	>	// Unlike UNIX signals where the thread state
1296	>	// is modified off of the stack, in Mach we
1297	>	// need to actually call thread_set_state to
1298	>	// have the register values updated.
1299	>	kern_return_t krc;
1300	>
1301	>	krc = thread_set_state(thread,
1302	>	MACHINE_THREAD_STATE, (thread_state_t)state,
1303	>	MACHINE_THREAD_STATE_COUNT);
1304	>	MACH_CHECK_ERROR (thread_get_state, krc);
1305	>	#endif
1306	>	return true;
1307	>	}
1308	>	break;
1309		#endif
1310	<	fault_recovered = true;
1310	>	case SIGSEGV_RETURN_FAILURE:
1311	>	return false;
1312		}
1313	<	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
1314	<	else if (sigsegv_ignore_fault) {
1315	<	// Call the instruction skipper with the register file available
1316	<	if (SIGSEGV_SKIP_INSTRUCTION(fault_instruction, SIGSEGV_REGISTER_FILE))
1317	<	fault_recovered = true;
1313	>
1314	>	// We can't do anything with the fault_address, dump state?
1315	>	if (sigsegv_state_dumper != 0)
1316	>	sigsegv_state_dumper(fault_address, fault_instruction);
1317	>
1318	>	return false;
1319	>	}
1320	>	#endif
1321	>
1322	>
1323	>	/*
1324	>	* There are two mechanisms for handling a bad memory access,
1325	>	* Mach exceptions and UNIX signals. The implementation specific
1326	>	* code appears below. Its reponsibility is to call handle_badaccess
1327	>	* which is the routine that handles the fault in an implementation
1328	>	* agnostic manner. The implementation specific code below is then
1329	>	* reponsible for checking whether handle_badaccess was able
1330	>	* to handle the memory access error and perform any implementation
1331	>	* specific tasks necessary afterwards.
1332	>	*/
1333	>
1334	>	#ifdef HAVE_MACH_EXCEPTIONS
1335	>	/*
1336	>	* We need to forward all exceptions that we do not handle.
1337	>	* This is important, there are many exceptions that may be
1338	>	* handled by other exception handlers. For example debuggers
1339	>	* use exceptions and the exception hander is in another
1340	>	* process in such a case. (Timothy J. Wood states in his
1341	>	* message to the list that he based this code on that from
1342	>	* gdb for Darwin.)
1343	>	*/
1344	>	static inline kern_return_t
1345	>	forward_exception(mach_port_t thread_port,
1346	>	mach_port_t task_port,
1347	>	exception_type_t exception_type,
1348	>	exception_data_t exception_data,
1349	>	mach_msg_type_number_t data_count,
1350	>	ExceptionPorts *oldExceptionPorts)
1351	>	{
1352	>	kern_return_t kret;
1353	>	unsigned int portIndex;
1354	>	mach_port_t port;
1355	>	exception_behavior_t behavior;
1356	>	thread_state_flavor_t flavor;
1357	>	thread_state_t thread_state;
1358	>	mach_msg_type_number_t thread_state_count;
1359	>
1360	>	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
1361	>	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
1362	>	// This handler wants the exception
1363	>	break;
1364	>	}
1365		}
1366	+
1367	+	if (portIndex >= oldExceptionPorts->maskCount) {
1368	+	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
1369	+	return KERN_FAILURE;
1370	+	}
1371	+
1372	+	port = oldExceptionPorts->handlers[portIndex];
1373	+	behavior = oldExceptionPorts->behaviors[portIndex];
1374	+	flavor = oldExceptionPorts->flavors[portIndex];
1375	+
1376	+	/*
1377	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
1378	+	*/
1379	+
1380	+	if (behavior != EXCEPTION_DEFAULT) {
1381	+	thread_state_count = THREAD_STATE_MAX;
1382	+	kret = thread_get_state (thread_port, flavor, thread_state,
1383	+	&thread_state_count);
1384	+	MACH_CHECK_ERROR (thread_get_state, kret);
1385	+	}
1386	+
1387	+	switch (behavior) {
1388	+	case EXCEPTION_DEFAULT:
1389	+	// fprintf(stderr, "forwarding to exception_raise\n");
1390	+	kret = exception_raise(port, thread_port, task_port, exception_type,
1391	+	exception_data, data_count);
1392	+	MACH_CHECK_ERROR (exception_raise, kret);
1393	+	break;
1394	+	case EXCEPTION_STATE:
1395	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
1396	+	kret = exception_raise_state(port, exception_type, exception_data,
1397	+	data_count, &flavor,
1398	+	thread_state, thread_state_count,
1399	+	thread_state, &thread_state_count);
1400	+	MACH_CHECK_ERROR (exception_raise_state, kret);
1401	+	break;
1402	+	case EXCEPTION_STATE_IDENTITY:
1403	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
1404	+	kret = exception_raise_state_identity(port, thread_port, task_port,
1405	+	exception_type, exception_data,
1406	+	data_count, &flavor,
1407	+	thread_state, thread_state_count,
1408	+	thread_state, &thread_state_count);
1409	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
1410	+	break;
1411	+	default:
1412	+	fprintf(stderr, "forward_exception got unknown behavior\n");
1413	+	break;
1414	+	}
1415	+
1416	+	if (behavior != EXCEPTION_DEFAULT) {
1417	+	kret = thread_set_state (thread_port, flavor, thread_state,
1418	+	thread_state_count);
1419	+	MACH_CHECK_ERROR (thread_set_state, kret);
1420	+	}
1421	+
1422	+	return KERN_SUCCESS;
1423	+	}
1424	+
1425	+	/*
1426	+	* This is the code that actually handles the exception.
1427	+	* It is called by exc_server. For Darwin 5 Apple changed
1428	+	* this a bit from how this family of functions worked in
1429	+	* Mach. If you are familiar with that it is a little
1430	+	* different. The main variation that concerns us here is
1431	+	* that code is an array of exception specific codes and
1432	+	* codeCount is a count of the number of codes in the code
1433	+	* array. In typical Mach all exceptions have a code
1434	+	* and sub-code. It happens to be the case that for a
1435	+	* EXC_BAD_ACCESS exception the first entry is the type of
1436	+	* bad access that occurred and the second entry is the
1437	+	* faulting address so these entries correspond exactly to
1438	+	* how the code and sub-code are used on Mach.
1439	+	*
1440	+	* This is a MIG interface. No code in Basilisk II should
1441	+	* call this directley. This has to have external C
1442	+	* linkage because that is what exc_server expects.
1443	+	*/
1444	+	kern_return_t
1445	+	catch_exception_raise(mach_port_t exception_port,
1446	+	mach_port_t thread,
1447	+	mach_port_t task,
1448	+	exception_type_t exception,
1449	+	exception_data_t code,
1450	+	mach_msg_type_number_t codeCount)
1451	+	{
1452	+	ppc_thread_state_t state;
1453	+	kern_return_t krc;
1454	+
1455	+	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
1456	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
1457	+	return KERN_SUCCESS;
1458	+	}
1459	+
1460	+	// In Mach we do not need to remove the exception handler.
1461	+	// If we forward the exception, eventually some exception handler
1462	+	// will take care of this exception.
1463	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
1464	+
1465	+	return krc;
1466	+	}
1467		#endif
1468
1469	<	if (!fault_recovered) {
1470	<	// FAIL: reinstall default handler for "safe" crash
1469	>	#ifdef HAVE_SIGSEGV_RECOVERY
1470	>	// Handle bad memory accesses with signal handler
1471	>	static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
1472	>	{
1473	>	// Call handler and reinstall the global handler, if required
1474	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
1475	>	#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
1476	>	sigsegv_do_install_handler(sig);
1477	>	#endif
1478	>	return;
1479	>	}
1480	>
1481	>	// Failure: reinstall default handler for "safe" crash
1482		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1483	<	SIGSEGV_ALL_SIGNALS
1483	>	SIGSEGV_ALL_SIGNALS
1484		#undef FAULT_HANDLER
510	–
511	–	// We can't do anything with the fault_address, dump state?
512	–	if (sigsegv_dump_state != 0)
513	–	sigsegv_dump_state(fault_address, fault_instruction);
514	–	}
1485		}
1486		#endif
1487
#	Line 525 | Line 1495 | static bool sigsegv_do_install_handler(i
1495		{
1496		// Setup SIGSEGV handler to process writes to frame buffer
1497		#ifdef HAVE_SIGACTION
1498	<	struct sigaction vosf_sa;
1499	<	sigemptyset(&vosf_sa.sa_mask);
1500	<	vosf_sa.sa_sigaction = sigsegv_handler;
1501	<	vosf_sa.sa_flags = SA_SIGINFO;
1502	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1498	>	struct sigaction sigsegv_sa;
1499	>	sigemptyset(&sigsegv_sa.sa_mask);
1500	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1501	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1502	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1503		#else
1504		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1505		#endif
#	Line 541 | Line 1511 | static bool sigsegv_do_install_handler(i
1511		{
1512		// Setup SIGSEGV handler to process writes to frame buffer
1513		#ifdef HAVE_SIGACTION
1514	<	struct sigaction vosf_sa;
1515	<	sigemptyset(&vosf_sa.sa_mask);
1516	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1514	>	struct sigaction sigsegv_sa;
1515	>	sigemptyset(&sigsegv_sa.sa_mask);
1516	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1517	>	sigsegv_sa.sa_flags = 0;
1518		#if !EMULATED_68K && defined(__NetBSD__)
1519	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1520	<	vosf_sa.sa_flags = SA_ONSTACK;
550	<	#else
551	<	vosf_sa.sa_flags = 0;
1519	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1520	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1521		#endif
1522	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1522	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1523		#else
1524		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1525		#endif
1526		}
1527		#endif
1528
1529	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
1529	>	#if defined(HAVE_MACH_EXCEPTIONS)
1530	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1531		{
1532	<	#ifdef HAVE_SIGSEGV_RECOVERY
1533	<	sigsegv_user_handler = handler;
1532	>	/*
1533	>	* Except for the exception port functions, this should be
1534	>	* pretty much stock Mach. If later you choose to support
1535	>	* other Mach's besides Darwin, just check for __MACH__
1536	>	* here and __APPLE__ where the actual differences are.
1537	>	*/
1538	>	#if defined(__APPLE__) && defined(__MACH__)
1539	>	if (sigsegv_fault_handler != NULL) {
1540	>	sigsegv_fault_handler = handler;
1541	>	return true;
1542	>	}
1543	>
1544	>	kern_return_t krc;
1545	>
1546	>	// create the the exception port
1547	>	krc = mach_port_allocate(mach_task_self(),
1548	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1549	>	if (krc != KERN_SUCCESS) {
1550	>	mach_error("mach_port_allocate", krc);
1551	>	return false;
1552	>	}
1553	>
1554	>	// add a port send right
1555	>	krc = mach_port_insert_right(mach_task_self(),
1556	>	_exceptionPort, _exceptionPort,
1557	>	MACH_MSG_TYPE_MAKE_SEND);
1558	>	if (krc != KERN_SUCCESS) {
1559	>	mach_error("mach_port_insert_right", krc);
1560	>	return false;
1561	>	}
1562	>
1563	>	// get the old exception ports
1564	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1565	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1566	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1567	>	if (krc != KERN_SUCCESS) {
1568	>	mach_error("thread_get_exception_ports", krc);
1569	>	return false;
1570	>	}
1571	>
1572	>	// set the new exception port
1573	>	//
1574	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1575	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1576	>	// message, but it turns out that in the common case this is not
1577	>	// neccessary. If we need it we can later ask for it from the
1578	>	// suspended thread.
1579	>	//
1580	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1581	>	// counter in the thread state.  The comments in the header file
1582	>	// seem to imply that you can count on the GPR's on an exception
1583	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1584	>	// you have to ask for all of the GPR's anyway just to get the
1585	>	// program counter. In any case because of update effective
1586	>	// address from immediate and update address from effective
1587	>	// addresses of ra and rb modes (as good an name as any for these
1588	>	// addressing modes) used in PPC instructions, you will need the
1589	>	// GPR state anyway.
1590	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1591	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1592	>	if (krc != KERN_SUCCESS) {
1593	>	mach_error("thread_set_exception_ports", krc);
1594	>	return false;
1595	>	}
1596	>
1597	>	// create the exception handler thread
1598	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1599	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1600	>	return false;
1601	>	}
1602	>
1603	>	// do not care about the exception thread any longer, let is run standalone
1604	>	(void)pthread_detach(exc_thread);
1605	>
1606	>	sigsegv_fault_handler = handler;
1607	>	return true;
1608	>	#else
1609	>	return false;
1610	>	#endif
1611	>	}
1612	>	#endif
1613	>
1614	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1615	>	{
1616	>	#if defined(HAVE_SIGSEGV_RECOVERY)
1617		bool success = true;
1618		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1619		SIGSEGV_ALL_SIGNALS
1620		#undef FAULT_HANDLER
1621	+	if (success)
1622	+	sigsegv_fault_handler = handler;
1623		return success;
1624	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1625	+	return sigsegv_do_install_handler(handler);
1626		#else
1627		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1628		return false;
#	Line 579 | Line 1636 | bool sigsegv_install_handler(sigsegv_han
1636
1637		void sigsegv_deinstall_handler(void)
1638		{
1639	+	// We do nothing for Mach exceptions, the thread would need to be
1640	+	// suspended if not already so, and we might mess with other
1641	+	// exception handlers that came after we registered ours. There is
1642	+	// no need to remove the exception handler, in fact this function is
1643	+	// not called anywhere in Basilisk II.
1644		#ifdef HAVE_SIGSEGV_RECOVERY
1645	<	sigsegv_user_handler = 0;
1645	>	sigsegv_fault_handler = 0;
1646		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1647		SIGSEGV_ALL_SIGNALS
1648		#undef FAULT_HANDLER
#	Line 589 | Line 1651 | void sigsegv_deinstall_handler(void)
1651
1652
1653		/*
592	–	*  SIGSEGV ignore state modifier
593	–	*/
594	–
595	–	void sigsegv_set_ignore_state(bool ignore_fault)
596	–	{
597	–	sigsegv_ignore_fault = ignore_fault;
598	–	}
599	–
600	–
601	–	/*
1654		*  Set callback function when we cannot handle the fault
1655		*/
1656
1657	<	void sigsegv_set_dump_state(sigsegv_handler_t handler)
1657	>	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
1658		{
1659	<	sigsegv_dump_state = handler;
1659	>	sigsegv_state_dumper = handler;
1660		}
1661
1662
#	Line 619 | Line 1671 | void sigsegv_set_dump_state(sigsegv_hand
1671		#include <sys/mman.h>
1672		#include "vm_alloc.h"
1673
1674	+	const int REF_INDEX = 123;
1675	+	const int REF_VALUE = 45;
1676	+
1677		static int page_size;
1678		static volatile char * page = 0;
1679		static volatile int handler_called = 0;
1680
1681	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1681	>	#ifdef __GNUC__
1682	>	// Code range where we expect the fault to come from
1683	>	static void *b_region, *e_region;
1684	>	#endif
1685	>
1686	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1687		{
1688	+	#if DEBUG
1689	+	printf("sigsegv_test_handler(%p, %p)\n", fault_address, instruction_address);
1690	+	printf("expected fault at %p\n", page + REF_INDEX);
1691	+	#ifdef __GNUC__
1692	+	printf("expected instruction address range: %p-%p\n", b_region, e_region);
1693	+	#endif
1694	+	#endif
1695		handler_called++;
1696	<	if ((fault_address - 123) != page)
1697	<	exit(1);
1696	>	if ((fault_address - REF_INDEX) != page)
1697	>	exit(10);
1698	>	#ifdef __GNUC__
1699	>	// Make sure reported fault instruction address falls into
1700	>	// expected code range
1701	>	if (instruction_address != SIGSEGV_INVALID_PC
1702	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1703	>	(instruction_address >= (sigsegv_address_t)e_region)))
1704	>	exit(11);
1705	>	#endif
1706		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
1707	<	exit(1);
1708	<	return true;
1707	>	exit(12);
1708	>	return SIGSEGV_RETURN_SUCCESS;
1709		}
1710
1711		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1712	<	static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1712	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1713		{
1714	<	return false;
1714	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1715	>	#ifdef __GNUC__
1716	>	// Make sure reported fault instruction address falls into
1717	>	// expected code range
1718	>	if (instruction_address != SIGSEGV_INVALID_PC
1719	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1720	>	(instruction_address >= (sigsegv_address_t)e_region)))
1721	>	return SIGSEGV_RETURN_FAILURE;
1722	>	#endif
1723	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1724	>	}
1725	>
1726	>	return SIGSEGV_RETURN_FAILURE;
1727	>	}
1728	>
1729	>	// More sophisticated tests for instruction skipper
1730	>	static bool arch_insn_skipper_tests()
1731	>	{
1732	>	#if (defined(i386) || defined(__i386__)) || defined(__x86_64__)
1733	>	static const unsigned char code[] = {
1734	>	0x8a, 0x00,                    // mov    (%eax),%al
1735	>	0x8a, 0x2c, 0x18,              // mov    (%eax,%ebx,1),%ch
1736	>	0x88, 0x20,                    // mov    %ah,(%eax)
1737	>	0x88, 0x08,                    // mov    %cl,(%eax)
1738	>	0x66, 0x8b, 0x00,              // mov    (%eax),%ax
1739	>	0x66, 0x8b, 0x0c, 0x18,        // mov    (%eax,%ebx,1),%cx
1740	>	0x66, 0x89, 0x00,              // mov    %ax,(%eax)
1741	>	0x66, 0x89, 0x0c, 0x18,        // mov    %cx,(%eax,%ebx,1)
1742	>	0x8b, 0x00,                    // mov    (%eax),%eax
1743	>	0x8b, 0x0c, 0x18,              // mov    (%eax,%ebx,1),%ecx
1744	>	0x89, 0x00,                    // mov    %eax,(%eax)
1745	>	0x89, 0x0c, 0x18,              // mov    %ecx,(%eax,%ebx,1)
1746	>	#if defined(__x86_64__)
1747	>	0x44, 0x8a, 0x00,              // mov    (%rax),%r8b
1748	>	0x44, 0x8a, 0x20,              // mov    (%rax),%r12b
1749	>	0x42, 0x8a, 0x3c, 0x10,        // mov    (%rax,%r10,1),%dil
1750	>	0x44, 0x88, 0x00,              // mov    %r8b,(%rax)
1751	>	0x44, 0x88, 0x20,              // mov    %r12b,(%rax)
1752	>	0x42, 0x88, 0x3c, 0x10,        // mov    %dil,(%rax,%r10,1)
1753	>	0x66, 0x44, 0x8b, 0x00,        // mov    (%rax),%r8w
1754	>	0x66, 0x42, 0x8b, 0x0c, 0x10,  // mov    (%rax,%r10,1),%cx
1755	>	0x66, 0x44, 0x89, 0x00,        // mov    %r8w,(%rax)
1756	>	0x66, 0x42, 0x89, 0x0c, 0x10,  // mov    %cx,(%rax,%r10,1)
1757	>	0x44, 0x8b, 0x00,              // mov    (%rax),%r8d
1758	>	0x42, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%ecx
1759	>	0x44, 0x89, 0x00,              // mov    %r8d,(%rax)
1760	>	0x42, 0x89, 0x0c, 0x10,        // mov    %ecx,(%rax,%r10,1)
1761	>	0x48, 0x8b, 0x08,              // mov    (%rax),%rcx
1762	>	0x4c, 0x8b, 0x18,              // mov    (%rax),%r11
1763	>	0x4a, 0x8b, 0x0c, 0x10,        // mov    (%rax,%r10,1),%rcx
1764	>	0x4e, 0x8b, 0x1c, 0x10,        // mov    (%rax,%r10,1),%r11
1765	>	0x48, 0x89, 0x08,              // mov    %rcx,(%rax)
1766	>	0x4c, 0x89, 0x18,              // mov    %r11,(%rax)
1767	>	0x4a, 0x89, 0x0c, 0x10,        // mov    %rcx,(%rax,%r10,1)
1768	>	0x4e, 0x89, 0x1c, 0x10,        // mov    %r11,(%rax,%r10,1)
1769	>	#endif
1770	>	0                              // end
1771	>	};
1772	>	const int N_REGS = 20;
1773	>	unsigned long regs[N_REGS];
1774	>	for (int i = 0; i < N_REGS; i++)
1775	>	regs[i] = i;
1776	>	const unsigned long start_code = (unsigned long)&code;
1777	>	regs[X86_REG_EIP] = start_code;
1778	>	while ((regs[X86_REG_EIP] - start_code) < (sizeof(code) - 1)
1779	>	&& ix86_skip_instruction(regs))
1780	>	; /* simply iterate */
1781	>	return (regs[X86_REG_EIP] - start_code) == (sizeof(code) - 1);
1782	>	#endif
1783	>	return true;
1784		}
1785		#endif
1786
#	Line 647 | Line 1791 | int main(void)
1791
1792		page_size = getpagesize();
1793		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1794	<	return 1;
1794	>	return 2;
1795
1796	+	memset((void *)page, 0, page_size);
1797		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1798	<	return 1;
1798	>	return 3;
1799
1800		if (!sigsegv_install_handler(sigsegv_test_handler))
1801	<	return 1;
657	<
658	<	page[123] = 45;
659	<	page[123] = 45;
1801	>	return 4;
1802
1803	+	#ifdef __GNUC__
1804	+	b_region = &&L_b_region1;
1805	+	e_region = &&L_e_region1;
1806	+	#endif
1807	+	L_b_region1:
1808	+	page[REF_INDEX] = REF_VALUE;
1809	+	if (page[REF_INDEX] != REF_VALUE)
1810	+	exit(20);
1811	+	page[REF_INDEX] = REF_VALUE;
1812	+	L_e_region1:
1813	+
1814		if (handler_called != 1)
1815	<	return 1;
1815	>	return 5;
1816
1817		#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1818		if (!sigsegv_install_handler(sigsegv_insn_handler))
1819	<	return 1;
1819	>	return 6;
1820
1821	<	if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0)
1822	<	return 1;
1821	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
1822	>	return 7;
1823
1824		for (int i = 0; i < page_size; i++)
1825		page[i] = (i + 1) % page_size;
1826
1827		if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1828	<	return 1;
1828	>	return 8;
1829
677	–	sigsegv_set_ignore_state(true);
678	–
1830		#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
1831	<	const unsigned int TAG = 0x12345678;                    \
1831	>	const unsigned long TAG = 0x12345678 |                  \
1832	>	(sizeof(long) == 8 ? 0x9abcdef0UL << 31 : 0);   \
1833		TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
1834	<	volatile unsigned int effect = data + TAG;              \
1834	>	volatile unsigned long effect = data + TAG;             \
1835		if (effect != TAG)                                                              \
1836	<	return 1;                                                                       \
1836	>	return 9;                                                                       \
1837		} while (0)
1838
1839	+	#ifdef __GNUC__
1840	+	b_region = &&L_b_region2;
1841	+	e_region = &&L_e_region2;
1842	+	#endif
1843	+	L_b_region2:
1844		TEST_SKIP_INSTRUCTION(unsigned char);
1845		TEST_SKIP_INSTRUCTION(unsigned short);
1846		TEST_SKIP_INSTRUCTION(unsigned int);
1847	+	TEST_SKIP_INSTRUCTION(unsigned long);
1848	+	L_e_region2:
1849	+
1850	+	if (!arch_insn_skipper_tests())
1851	+	return 20;
1852		#endif
1853
1854		vm_exit();

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