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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.7 by cebix, 2002-01-15T14:58:37Z vs.
Revision 1.30 by gbeauche, 2003-10-13T19:56:17Z

#	Line 4 | Line 4
4		*  Derived from Bruno Haible's work on his SIGSEGV library for clisp
5		*  <http://clisp.sourceforge.net/>
6		*
7	+	*  MacOS X support derived from the post by Timothy J. Wood to the
8	+	*  omnigroup macosx-dev list:
9	+	*    Mach Exception Handlers 101 (Was Re: ptrace, gdb)
10	+	*    tjw@omnigroup.com Sun, 4 Jun 2000
11	+	*    www.omnigroup.com/mailman/archive/macosx-dev/2000-June/002030.html
12	+	*
13		*  Basilisk II (C) 1997-2002 Christian Bauer
14		*
15		*  This program is free software; you can redistribute it and/or modify
#	Line 29 | Line 35
35		#include "config.h"
36		#endif
37
38	+	#include <list>
39		#include <signal.h>
40		#include "sigsegv.h"
41
42	+	#ifndef NO_STD_NAMESPACE
43	+	using std::list;
44	+	#endif
45	+
46		// Return value type of a signal handler (standard type if not defined)
47		#ifndef RETSIGTYPE
48		#define RETSIGTYPE void
#	Line 41 | Line 52
52		typedef RETSIGTYPE (*signal_handler)(int);
53
54		// User's SIGSEGV handler
55	<	static sigsegv_handler_t sigsegv_user_handler = 0;
55	>	static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
56	>
57	>	// Function called to dump state if we can't handle the fault
58	>	static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
59
60		// Actual SIGSEGV handler installer
61		static bool sigsegv_do_install_handler(int sig);
62
63
64		/*
65	+	*  Instruction decoding aids
66	+	*/
67	+
68	+	// Transfer size
69	+	enum transfer_size_t {
70	+	SIZE_UNKNOWN,
71	+	SIZE_BYTE,
72	+	SIZE_WORD,
73	+	SIZE_LONG
74	+	};
75	+
76	+	// Transfer type
77	+	typedef sigsegv_transfer_type_t transfer_type_t;
78	+
79	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
80	+	// Addressing mode
81	+	enum addressing_mode_t {
82	+	MODE_UNKNOWN,
83	+	MODE_NORM,
84	+	MODE_U,
85	+	MODE_X,
86	+	MODE_UX
87	+	};
88	+
89	+	// Decoded instruction
90	+	struct instruction_t {
91	+	transfer_type_t         transfer_type;
92	+	transfer_size_t         transfer_size;
93	+	addressing_mode_t       addr_mode;
94	+	unsigned int            addr;
95	+	char                            ra, rd;
96	+	};
97	+
98	+	static void powerpc_decode_instruction(instruction_t *instruction, unsigned int nip, unsigned int * gpr)
99	+	{
100	+	// Get opcode and divide into fields
101	+	unsigned int opcode = *((unsigned int *)nip);
102	+	unsigned int primop = opcode >> 26;
103	+	unsigned int exop = (opcode >> 1) & 0x3ff;
104	+	unsigned int ra = (opcode >> 16) & 0x1f;
105	+	unsigned int rb = (opcode >> 11) & 0x1f;
106	+	unsigned int rd = (opcode >> 21) & 0x1f;
107	+	signed int imm = (signed short)(opcode & 0xffff);
108	+
109	+	// Analyze opcode
110	+	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
111	+	transfer_size_t transfer_size = SIZE_UNKNOWN;
112	+	addressing_mode_t addr_mode = MODE_UNKNOWN;
113	+	switch (primop) {
114	+	case 31:
115	+	switch (exop) {
116	+	case 23:        // lwzx
117	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
118	+	case 55:        // lwzux
119	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
120	+	case 87:        // lbzx
121	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
122	+	case 119:       // lbzux
123	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
124	+	case 151:       // stwx
125	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_X; break;
126	+	case 183:       // stwux
127	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_UX; break;
128	+	case 215:       // stbx
129	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_X; break;
130	+	case 247:       // stbux
131	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_UX; break;
132	+	case 279:       // lhzx
133	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
134	+	case 311:       // lhzux
135	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
136	+	case 343:       // lhax
137	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
138	+	case 375:       // lhaux
139	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
140	+	case 407:       // sthx
141	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_X; break;
142	+	case 439:       // sthux
143	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_UX; break;
144	+	}
145	+	break;
146	+
147	+	case 32:        // lwz
148	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
149	+	case 33:        // lwzu
150	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
151	+	case 34:        // lbz
152	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
153	+	case 35:        // lbzu
154	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
155	+	case 36:        // stw
156	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_NORM; break;
157	+	case 37:        // stwu
158	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_LONG; addr_mode = MODE_U; break;
159	+	case 38:        // stb
160	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_NORM; break;
161	+	case 39:        // stbu
162	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_BYTE; addr_mode = MODE_U; break;
163	+	case 40:        // lhz
164	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
165	+	case 41:        // lhzu
166	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
167	+	case 42:        // lha
168	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
169	+	case 43:        // lhau
170	+	transfer_type = SIGSEGV_TRANSFER_LOAD; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
171	+	case 44:        // sth
172	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_NORM; break;
173	+	case 45:        // sthu
174	+	transfer_type = SIGSEGV_TRANSFER_STORE; transfer_size = SIZE_WORD; addr_mode = MODE_U; break;
175	+	}
176	+
177	+	// Calculate effective address
178	+	unsigned int addr = 0;
179	+	switch (addr_mode) {
180	+	case MODE_X:
181	+	case MODE_UX:
182	+	if (ra == 0)
183	+	addr = gpr[rb];
184	+	else
185	+	addr = gpr[ra] + gpr[rb];
186	+	break;
187	+	case MODE_NORM:
188	+	case MODE_U:
189	+	if (ra == 0)
190	+	addr = (signed int)(signed short)imm;
191	+	else
192	+	addr = gpr[ra] + (signed int)(signed short)imm;
193	+	break;
194	+	default:
195	+	break;
196	+	}
197	+
198	+	// Commit decoded instruction
199	+	instruction->addr = addr;
200	+	instruction->addr_mode = addr_mode;
201	+	instruction->transfer_type = transfer_type;
202	+	instruction->transfer_size = transfer_size;
203	+	instruction->ra = ra;
204	+	instruction->rd = rd;
205	+	}
206	+	#endif
207	+
208	+
209	+	/*
210		*  OS-dependant SIGSEGV signals support section
211		*/
212
213		#if HAVE_SIGINFO_T
214		// Generic extended signal handler
215	+	#define SIGSEGV_FAULT_HANDLER                   sigsegv_fault_handler
216	+	#if defined(__NetBSD__) || defined(__FreeBSD__)
217	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
218	+	#else
219		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
220	+	#endif
221		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, siginfo_t *sip, void *scp
222	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 siginfo_t *sip, void *scp
223	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sip, scp
224		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
225	+	#if defined(__NetBSD__) || defined(__FreeBSD__)
226	+	#if (defined(i386) || defined(__i386__))
227	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
228	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned int *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
229	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
230	+	#endif
231	+	#endif
232		#if defined(__linux__)
233		#if (defined(i386) || defined(__i386__))
234		#include <sys/ucontext.h>
235	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
235	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
236	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
237	>	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)SIGSEGV_CONTEXT_REGS
238	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
239	>	#endif
240	>	#if (defined(x86_64) || defined(__x86_64__))
241	>	#include <sys/ucontext.h>
242	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
243	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
244	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
245		#endif
246		#if (defined(ia64) || defined(__ia64__))
247		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
248		#endif
249	+	#if (defined(powerpc) || defined(__powerpc__))
250	+	#include <sys/ucontext.h>
251	+	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
252	+	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
253	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
254	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
255	+	#endif
256		#endif
257		#endif
258
259		#if HAVE_SIGCONTEXT_SUBTERFUGE
260	+	#define SIGSEGV_FAULT_HANDLER                   sigsegv_fault_handler
261		// Linux kernels prior to 2.4 ?
262		#if defined(__linux__)
263		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
264		#if (defined(i386) || defined(__i386__))
265		#include <asm/sigcontext.h>
266		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
267	<	#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
268	<	#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
267	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 struct sigcontext *scp
268	>	#define SIGSEGV_FAULT_HANDLER_ARGS              &scs
269	>	#define SIGSEGV_FAULT_ADDRESS                   scp->cr2
270	>	#define SIGSEGV_FAULT_INSTRUCTION               scp->eip
271	>	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)scp
272	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
273		#endif
274		#if (defined(sparc) || defined(__sparc__))
275		#include <asm/sigcontext.h>
276		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
277	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
278		#define SIGSEGV_FAULT_ADDRESS                   addr
279		#endif
280		#if (defined(powerpc) || defined(__powerpc__))
281		#include <asm/sigcontext.h>
282		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
283	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, scp
284		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
285		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
286	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
287	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
288		#endif
289		#if (defined(alpha) || defined(__alpha__))
290		#include <asm/sigcontext.h>
291		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
292	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
293		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
294		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
295
#	Line 107 | Line 306 | static sigsegv_address_t get_fault_addre
306
307		// Irix 5 or 6 on MIPS
308		#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
309	+	#include <ucontext.h>
310		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
311	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
312		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
313		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
314		#endif
315
316	+	// HP-UX
317	+	#if (defined(hpux) || defined(__hpux__))
318	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
319	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
320	+	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
321	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
322	+	#endif
323	+
324		// OSF/1 on Alpha
325		#if defined(__osf__)
326	+	#include <ucontext.h>
327		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
328	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
329		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
330		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
331		#endif
#	Line 122 | Line 333 | static sigsegv_address_t get_fault_addre
333		// AIX
334		#if defined(_AIX)
335		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
336	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
337		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
338		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
339		#endif
#	Line 131 | Line 343 | static sigsegv_address_t get_fault_addre
343		#if (defined(m68k) || defined(__m68k__))
344		#include <m68k/frame.h>
345		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
346	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
347	<	struct sigstate {                                                                                                                                                                       \
136	<	int ss_flags;                                                                                                                                                                   \
137	<	struct frame ss_frame;                                                                                                                                                  \
138	<	};                                                                                                                                                                                                      \
139	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
140	<	char *fault_addr;                                                                                                                                                                       \
141	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
142	<	case 7:         /* 68040 access error */                                                                                                                                \
143	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
144	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
145	<	break;                                                                                                                                                                                  \
146	<	default:                                                                                                                                                                                        \
147	<	fault_addr = (char *)code;                                                                                                                                              \
148	<	break;                                                                                                                                                                                  \
149	<	}                                                                                                                                                                                                       \
150	<	fault_addr;                                                                                                                                                                                     \
151	<	})
346	>	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
347	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
348		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
349	+
350	+	// Use decoding scheme from BasiliskII/m68k native
351	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
352	+	{
353	+	struct sigstate {
354	+	int ss_flags;
355	+	struct frame ss_frame;
356	+	};
357	+	struct sigstate *state = (struct sigstate *)scp->sc_ap;
358	+	char *fault_addr;
359	+	switch (state->ss_frame.f_format) {
360	+	case 7:         /* 68040 access error */
361	+	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
362	+	fault_addr = state->ss_frame.f_fmt7.f_fa;
363	+	break;
364	+	default:
365	+	fault_addr = (char *)code;
366	+	break;
367	+	}
368	+	return (sigsegv_address_t)fault_addr;
369	+	}
370		#else
371		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
372	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp, addr
373		#define SIGSEGV_FAULT_ADDRESS                   addr
374		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
375		#endif
376		#endif
377
378	<	// MacOS X
378	>	// MacOS X, not sure which version this works in. Under 10.1
379	>	// vm_protect does not appear to work from a signal handler. Under
380	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
381	>	// field is the address of the faulting instruction and not the
382	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
383	>	// case with Mach exception handlers there is a way to do what this
384	>	// was meant to do.
385	>	#ifndef HAVE_MACH_EXCEPTIONS
386		#if defined(__APPLE__) && defined(__MACH__)
387		#if (defined(ppc) || defined(__ppc__))
388		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
389	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
390		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
391		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
392		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
393	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
394	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
395
396	<	// From Boehm's GC 6.0alpha8
169	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
170	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
171	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
172	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
173	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
174	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
175	<
396	>	// Use decoding scheme from SheepShaver
397		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
398		{
399	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
400	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
401	<	int            disp = 0, tmp;
402	<	unsigned int   baseA = 0, baseB = 0;
403	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
404	<
405	<	switch(EXTRACT_OP1(instr)) {
406	<	case 38:   /* stb */
407	<	case 39:   /* stbu */
408	<	case 54:   /* stfd */
409	<	case 55:   /* stfdu */
410	<	case 52:   /* stfs */
411	<	case 53:   /* stfsu */
412	<	case 44:   /* sth */
413	<	case 45:   /* sthu */
414	<	case 47:   /* stmw */
415	<	case 36:   /* stw */
416	<	case 37:   /* stwu */
417	<	tmp = EXTRACT_REGA(instr);
418	<	if(tmp > 0)
419	<	baseA = regs[tmp];
420	<	disp = EXTRACT_DISP(instr);
399	>	unsigned int   nip = (unsigned int) scp->sc_ir;
400	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
401	>	instruction_t  instr;
402	>
403	>	powerpc_decode_instruction(&instr, nip, gpr);
404	>	return (sigsegv_address_t)instr.addr;
405	>	}
406	>	#endif
407	>	#endif
408	>	#endif
409	>	#endif
410	>
411	>	#if HAVE_MACH_EXCEPTIONS
412	>
413	>	// This can easily be extended to other Mach systems, but really who
414	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
415	>	// Mach 2.5/3.0?
416	>	#if defined(__APPLE__) && defined(__MACH__)
417	>
418	>	#include <sys/types.h>
419	>	#include <stdlib.h>
420	>	#include <stdio.h>
421	>	#include <pthread.h>
422	>
423	>	/*
424	>	* If you are familiar with MIG then you will understand the frustration
425	>	* that was necessary to get these embedded into C++ code by hand.
426	>	*/
427	>	extern "C" {
428	>	#include <mach/mach.h>
429	>	#include <mach/mach_error.h>
430	>
431	>	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
432	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
433	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
434	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
435	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
436	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
437	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
438	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
439	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
440	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
441	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
442	>	}
443	>
444	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
445	>	#define HANDLER_COUNT 64
446	>
447	>	// structure to tuck away existing exception handlers
448	>	typedef struct _ExceptionPorts {
449	>	mach_msg_type_number_t maskCount;
450	>	exception_mask_t masks[HANDLER_COUNT];
451	>	exception_handler_t handlers[HANDLER_COUNT];
452	>	exception_behavior_t behaviors[HANDLER_COUNT];
453	>	thread_state_flavor_t flavors[HANDLER_COUNT];
454	>	} ExceptionPorts;
455	>
456	>	// exception handler thread
457	>	static pthread_t exc_thread;
458	>
459	>	// place where old exception handler info is stored
460	>	static ExceptionPorts ports;
461	>
462	>	// our exception port
463	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
464	>
465	>	#define MACH_CHECK_ERROR(name,ret) \
466	>	if (ret != KERN_SUCCESS) { \
467	>	mach_error(#name, ret); \
468	>	exit (1); \
469	>	}
470	>
471	>	#define SIGSEGV_FAULT_ADDRESS                   code[1]
472	>	#define SIGSEGV_FAULT_INSTRUCTION               get_fault_instruction(thread, state)
473	>	#define SIGSEGV_FAULT_HANDLER                   (code[0] == KERN_PROTECTION_FAILURE) && sigsegv_fault_handler
474	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
475	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
476	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
477	>	#define SIGSEGV_REGISTER_FILE                   &state->srr0, &state->r0
478	>
479	>	// Given a suspended thread, stuff the current instruction and
480	>	// registers into state.
481	>	//
482	>	// It would have been nice to have this be ppc/x86 independant which
483	>	// could have been done easily with a thread_state_t instead of
484	>	// ppc_thread_state_t, but because of the way this is called it is
485	>	// easier to do it this way.
486	>	#if (defined(ppc) || defined(__ppc__))
487	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
488	>	{
489	>	kern_return_t krc;
490	>	mach_msg_type_number_t count;
491	>
492	>	count = MACHINE_THREAD_STATE_COUNT;
493	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
494	>	MACH_CHECK_ERROR (thread_get_state, krc);
495	>
496	>	return (sigsegv_address_t)state->srr0;
497	>	}
498	>	#endif
499	>
500	>	// Since there can only be one exception thread running at any time
501	>	// this is not a problem.
502	>	#define MSG_SIZE 512
503	>	static char msgbuf[MSG_SIZE];
504	>	static char replybuf[MSG_SIZE];
505	>
506	>	/*
507	>	* This is the entry point for the exception handler thread. The job
508	>	* of this thread is to wait for exception messages on the exception
509	>	* port that was setup beforehand and to pass them on to exc_server.
510	>	* exc_server is a MIG generated function that is a part of Mach.
511	>	* Its job is to decide what to do with the exception message. In our
512	>	* case exc_server calls catch_exception_raise on our behalf. After
513	>	* exc_server returns, it is our responsibility to send the reply.
514	>	*/
515	>	static void *
516	>	handleExceptions(void *priv)
517	>	{
518	>	mach_msg_header_t *msg, *reply;
519	>	kern_return_t krc;
520	>
521	>	msg = (mach_msg_header_t *)msgbuf;
522	>	reply = (mach_msg_header_t *)replybuf;
523	>
524	>	for (;;) {
525	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
526	>	_exceptionPort, 0, MACH_PORT_NULL);
527	>	MACH_CHECK_ERROR(mach_msg, krc);
528	>
529	>	if (!exc_server(msg, reply)) {
530	>	fprintf(stderr, "exc_server hated the message\n");
531	>	exit(1);
532	>	}
533	>
534	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
535	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
536	>	if (krc != KERN_SUCCESS) {
537	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
538	>	krc, mach_error_string(krc));
539	>	exit(1);
540	>	}
541	>	}
542	>	}
543	>	#endif
544	>	#endif
545	>
546	>
547	>	/*
548	>	*  Instruction skipping
549	>	*/
550	>
551	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
552	>	// Decode and skip X86 instruction
553	>	#if (defined(i386) || defined(__i386__))
554	>	#if defined(__linux__)
555	>	enum {
556	>	X86_REG_EIP = 14,
557	>	X86_REG_EAX = 11,
558	>	X86_REG_ECX = 10,
559	>	X86_REG_EDX = 9,
560	>	X86_REG_EBX = 8,
561	>	X86_REG_ESP = 7,
562	>	X86_REG_EBP = 6,
563	>	X86_REG_ESI = 5,
564	>	X86_REG_EDI = 4
565	>	};
566	>	#endif
567	>	#if defined(__NetBSD__) || defined(__FreeBSD__)
568	>	enum {
569	>	X86_REG_EIP = 10,
570	>	X86_REG_EAX = 7,
571	>	X86_REG_ECX = 6,
572	>	X86_REG_EDX = 5,
573	>	X86_REG_EBX = 4,
574	>	X86_REG_ESP = 13,
575	>	X86_REG_EBP = 2,
576	>	X86_REG_ESI = 1,
577	>	X86_REG_EDI = 0
578	>	};
579	>	#endif
580	>	// FIXME: this is partly redundant with the instruction decoding phase
581	>	// to discover transfer type and register number
582	>	static inline int ix86_step_over_modrm(unsigned char * p)
583	>	{
584	>	int mod = (p[0] >> 6) & 3;
585	>	int rm = p[0] & 7;
586	>	int offset = 0;
587	>
588	>	// ModR/M Byte
589	>	switch (mod) {
590	>	case 0: // [reg]
591	>	if (rm == 5) return 4; // disp32
592		break;
593	<	case 31:
594	<	switch(EXTRACT_OP2(instr)) {
595	<	case 86:    /* dcbf */
596	<	case 54:    /* dcbst */
597	<	case 1014:  /* dcbz */
598	<	case 247:   /* stbux */
599	<	case 215:   /* stbx */
600	<	case 759:   /* stfdux */
601	<	case 727:   /* stfdx */
602	<	case 983:   /* stfiwx */
603	<	case 695:   /* stfsux */
604	<	case 663:   /* stfsx */
605	<	case 918:   /* sthbrx */
606	<	case 439:   /* sthux */
607	<	case 407:   /* sthx */
608	<	case 661:   /* stswx */
609	<	case 662:   /* stwbrx */
610	<	case 150:   /* stwcx. */
611	<	case 183:   /* stwux */
612	<	case 151:   /* stwx */
613	<	case 135:   /* stvebx */
614	<	case 167:   /* stvehx */
615	<	case 199:   /* stvewx */
616	<	case 231:   /* stvx */
617	<	case 487:   /* stvxl */
618	<	tmp = EXTRACT_REGA(instr);
619	<	if(tmp > 0)
620	<	baseA = regs[tmp];
621	<	baseB = regs[EXTRACT_REGC(instr)];
622	<	/* determine Altivec alignment mask */
623	<	switch(EXTRACT_OP2(instr)) {
624	<	case 167:   /* stvehx */
625	<	alignmask = 0xFFFFFFFE;
626	<	break;
627	<	case 199:   /* stvewx */
628	<	alignmask = 0xFFFFFFFC;
629	<	break;
630	<	case 231:   /* stvx */
631	<	alignmask = 0xFFFFFFF0;
632	<	break;
633	<	case 487:  /* stvxl */
634	<	alignmask = 0xFFFFFFF0;
635	<	break;
636	<	}
593	>	case 1: // disp8[reg]
594	>	offset = 1;
595	>	break;
596	>	case 2: // disp32[reg]
597	>	offset = 4;
598	>	break;
599	>	case 3: // register
600	>	return 0;
601	>	}
602	>
603	>	// SIB Byte
604	>	if (rm == 4) {
605	>	if (mod == 0 && (p[1] & 7) == 5)
606	>	offset = 5; // disp32[index]
607	>	else
608	>	offset++;
609	>	}
610	>
611	>	return offset;
612	>	}
613	>
614	>	static bool ix86_skip_instruction(unsigned int * regs)
615	>	{
616	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
617	>
618	>	if (eip == 0)
619	>	return false;
620	>
621	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
622	>	transfer_size_t transfer_size = SIZE_LONG;
623	>
624	>	int reg = -1;
625	>	int len = 0;
626	>
627	>	// Operand size prefix
628	>	if (*eip == 0x66) {
629	>	eip++;
630	>	len++;
631	>	transfer_size = SIZE_WORD;
632	>	}
633	>
634	>	// Decode instruction
635	>	switch (eip[0]) {
636	>	case 0x0f:
637	>	switch (eip[1]) {
638	>	case 0xb6: // MOVZX r32, r/m8
639	>	case 0xb7: // MOVZX r32, r/m16
640	>	switch (eip[2] & 0xc0) {
641	>	case 0x80:
642	>	reg = (eip[2] >> 3) & 7;
643	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
644	>	break;
645	>	case 0x40:
646	>	reg = (eip[2] >> 3) & 7;
647	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
648	>	break;
649	>	case 0x00:
650	>	reg = (eip[2] >> 3) & 7;
651	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
652	>	break;
653	>	}
654	>	len += 3 + ix86_step_over_modrm(eip + 2);
655	>	break;
656	>	}
657	>	break;
658	>	case 0x8a: // MOV r8, r/m8
659	>	transfer_size = SIZE_BYTE;
660	>	case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
661	>	switch (eip[1] & 0xc0) {
662	>	case 0x80:
663	>	reg = (eip[1] >> 3) & 7;
664	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
665		break;
666	<	case 725:   /* stswi */
667	<	tmp = EXTRACT_REGA(instr);
668	<	if(tmp > 0)
249	<	baseA = regs[tmp];
666	>	case 0x40:
667	>	reg = (eip[1] >> 3) & 7;
668	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
669		break;
670	<	default:   /* ignore instruction */
671	<	return 0;
670	>	case 0x00:
671	>	reg = (eip[1] >> 3) & 7;
672	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
673		break;
674		}
675	+	len += 2 + ix86_step_over_modrm(eip + 1);
676		break;
677	<	default:   /* ignore instruction */
678	<	return 0;
677	>	case 0x88: // MOV r/m8, r8
678	>	transfer_size = SIZE_BYTE;
679	>	case 0x89: // MOV r/m32, r32 (or 16-bit operation)
680	>	switch (eip[1] & 0xc0) {
681	>	case 0x80:
682	>	reg = (eip[1] >> 3) & 7;
683	>	transfer_type = SIGSEGV_TRANSFER_STORE;
684	>	break;
685	>	case 0x40:
686	>	reg = (eip[1] >> 3) & 7;
687	>	transfer_type = SIGSEGV_TRANSFER_STORE;
688	>	break;
689	>	case 0x00:
690	>	reg = (eip[1] >> 3) & 7;
691	>	transfer_type = SIGSEGV_TRANSFER_STORE;
692	>	break;
693	>	}
694	>	len += 2 + ix86_step_over_modrm(eip + 1);
695		break;
696		}
697	+
698	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
699	+	// Unknown machine code, let it crash. Then patch the decoder
700	+	return false;
701	+	}
702	+
703	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
704	+	static const int x86_reg_map[8] = {
705	+	X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
706	+	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
707	+	};
708	+
709	+	if (reg < 0 || reg >= 8)
710	+	return false;
711	+
712	+	int rloc = x86_reg_map[reg];
713	+	switch (transfer_size) {
714	+	case SIZE_BYTE:
715	+	regs[rloc] = (regs[rloc] & ~0xff);
716	+	break;
717	+	case SIZE_WORD:
718	+	regs[rloc] = (regs[rloc] & ~0xffff);
719	+	break;
720	+	case SIZE_LONG:
721	+	regs[rloc] = 0;
722	+	break;
723	+	}
724	+	}
725	+
726	+	#if DEBUG
727	+	printf("%08x: %s %s access", regs[X86_REG_EIP],
728	+	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
729	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
730	+
731	+	if (reg != -1) {
732	+	static const char * x86_reg_str_map[8] = {
733	+	"eax", "ecx", "edx", "ebx",
734	+	"esp", "ebp", "esi", "edi"
735	+	};
736	+	printf(" %s register %%%s", transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from", x86_reg_str_map[reg]);
737	+	}
738	+	printf(", %d bytes instruction\n", len);
739	+	#endif
740
741	<	addr = (baseA + baseB) + disp;
742	<	addr &= alignmask;
263	<	return (sigsegv_address_t)addr;
741	>	regs[X86_REG_EIP] += len;
742	>	return true;
743		}
744		#endif
745	+
746	+	// Decode and skip PPC instruction
747	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
748	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
749	+	{
750	+	instruction_t instr;
751	+	powerpc_decode_instruction(&instr, *nip_p, regs);
752	+
753	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
754	+	// Unknown machine code, let it crash. Then patch the decoder
755	+	return false;
756	+	}
757	+
758	+	#if DEBUG
759	+	printf("%08x: %s %s access", *nip_p,
760	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
761	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
762	+
763	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
764	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
765	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
766	+	printf(" r%d (rd = 0)\n", instr.rd);
767	+	#endif
768	+
769	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
770	+	regs[instr.ra] = instr.addr;
771	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
772	+	regs[instr.rd] = 0;
773	+
774	+	*nip_p += 4;
775	+	return true;
776	+	}
777		#endif
778		#endif
779
#	Line 270 | Line 781 | static sigsegv_address_t get_fault_addre
781		#ifndef SIGSEGV_FAULT_INSTRUCTION
782		#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_INVALID_PC
783		#endif
784	+	#ifndef SIGSEGV_FAULT_HANDLER_ARGLIST_1
785	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST_1 SIGSEGV_FAULT_HANDLER_ARGLIST
786	+	#endif
787
788		// SIGSEGV recovery supported ?
789		#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
#	Line 281 | Line 795 | static sigsegv_address_t get_fault_addre
795		*  SIGSEGV global handler
796		*/
797
798	+	#if defined(HAVE_SIGSEGV_RECOVERY) || defined(HAVE_MACH_EXCEPTIONS)
799	+	// This function handles the badaccess to memory.
800	+	// It is called from the signal handler or the exception handler.
801	+	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
802	+	{
803	+	sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
804	+	sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
805	+
806	+	// Call user's handler and reinstall the global handler, if required
807	+	switch (sigsegv_fault_handler(fault_address, fault_instruction)) {
808	+	case SIGSEGV_RETURN_SUCCESS:
809	+	return true;
810	+
811	+	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
812	+	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
813	+	// Call the instruction skipper with the register file
814	+	// available
815	+	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
816	+	#ifdef HAVE_MACH_EXCEPTIONS
817	+	// Unlike UNIX signals where the thread state
818	+	// is modified off of the stack, in Mach we
819	+	// need to actually call thread_set_state to
820	+	// have the register values updated.
821	+	kern_return_t krc;
822	+
823	+	krc = thread_set_state(thread,
824	+	MACHINE_THREAD_STATE, (thread_state_t)state,
825	+	MACHINE_THREAD_STATE_COUNT);
826	+	MACH_CHECK_ERROR (thread_get_state, krc);
827	+	#endif
828	+	return true;
829	+	}
830	+	break;
831	+	#endif
832	+	}
833	+
834	+	// We can't do anything with the fault_address, dump state?
835	+	if (sigsegv_state_dumper != 0)
836	+	sigsegv_state_dumper(fault_address, fault_instruction);
837	+
838	+	return false;
839	+	}
840	+	#endif
841	+
842	+
843	+	/*
844	+	* There are two mechanisms for handling a bad memory access,
845	+	* Mach exceptions and UNIX signals. The implementation specific
846	+	* code appears below. Its reponsibility is to call handle_badaccess
847	+	* which is the routine that handles the fault in an implementation
848	+	* agnostic manner. The implementation specific code below is then
849	+	* reponsible for checking whether handle_badaccess was able
850	+	* to handle the memory access error and perform any implementation
851	+	* specific tasks necessary afterwards.
852	+	*/
853	+
854	+	#ifdef HAVE_MACH_EXCEPTIONS
855	+	/*
856	+	* We need to forward all exceptions that we do not handle.
857	+	* This is important, there are many exceptions that may be
858	+	* handled by other exception handlers. For example debuggers
859	+	* use exceptions and the exception hander is in another
860	+	* process in such a case. (Timothy J. Wood states in his
861	+	* message to the list that he based this code on that from
862	+	* gdb for Darwin.)
863	+	*/
864	+	static inline kern_return_t
865	+	forward_exception(mach_port_t thread_port,
866	+	mach_port_t task_port,
867	+	exception_type_t exception_type,
868	+	exception_data_t exception_data,
869	+	mach_msg_type_number_t data_count,
870	+	ExceptionPorts *oldExceptionPorts)
871	+	{
872	+	kern_return_t kret;
873	+	unsigned int portIndex;
874	+	mach_port_t port;
875	+	exception_behavior_t behavior;
876	+	thread_state_flavor_t flavor;
877	+	thread_state_t thread_state;
878	+	mach_msg_type_number_t thread_state_count;
879	+
880	+	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
881	+	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
882	+	// This handler wants the exception
883	+	break;
884	+	}
885	+	}
886	+
887	+	if (portIndex >= oldExceptionPorts->maskCount) {
888	+	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
889	+	return KERN_FAILURE;
890	+	}
891	+
892	+	port = oldExceptionPorts->handlers[portIndex];
893	+	behavior = oldExceptionPorts->behaviors[portIndex];
894	+	flavor = oldExceptionPorts->flavors[portIndex];
895	+
896	+	/*
897	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
898	+	*/
899	+
900	+	if (behavior != EXCEPTION_DEFAULT) {
901	+	thread_state_count = THREAD_STATE_MAX;
902	+	kret = thread_get_state (thread_port, flavor, thread_state,
903	+	&thread_state_count);
904	+	MACH_CHECK_ERROR (thread_get_state, kret);
905	+	}
906	+
907	+	switch (behavior) {
908	+	case EXCEPTION_DEFAULT:
909	+	// fprintf(stderr, "forwarding to exception_raise\n");
910	+	kret = exception_raise(port, thread_port, task_port, exception_type,
911	+	exception_data, data_count);
912	+	MACH_CHECK_ERROR (exception_raise, kret);
913	+	break;
914	+	case EXCEPTION_STATE:
915	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
916	+	kret = exception_raise_state(port, exception_type, exception_data,
917	+	data_count, &flavor,
918	+	thread_state, thread_state_count,
919	+	thread_state, &thread_state_count);
920	+	MACH_CHECK_ERROR (exception_raise_state, kret);
921	+	break;
922	+	case EXCEPTION_STATE_IDENTITY:
923	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
924	+	kret = exception_raise_state_identity(port, thread_port, task_port,
925	+	exception_type, exception_data,
926	+	data_count, &flavor,
927	+	thread_state, thread_state_count,
928	+	thread_state, &thread_state_count);
929	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
930	+	break;
931	+	default:
932	+	fprintf(stderr, "forward_exception got unknown behavior\n");
933	+	break;
934	+	}
935	+
936	+	if (behavior != EXCEPTION_DEFAULT) {
937	+	kret = thread_set_state (thread_port, flavor, thread_state,
938	+	thread_state_count);
939	+	MACH_CHECK_ERROR (thread_set_state, kret);
940	+	}
941	+
942	+	return KERN_SUCCESS;
943	+	}
944	+
945	+	/*
946	+	* This is the code that actually handles the exception.
947	+	* It is called by exc_server. For Darwin 5 Apple changed
948	+	* this a bit from how this family of functions worked in
949	+	* Mach. If you are familiar with that it is a little
950	+	* different. The main variation that concerns us here is
951	+	* that code is an array of exception specific codes and
952	+	* codeCount is a count of the number of codes in the code
953	+	* array. In typical Mach all exceptions have a code
954	+	* and sub-code. It happens to be the case that for a
955	+	* EXC_BAD_ACCESS exception the first entry is the type of
956	+	* bad access that occurred and the second entry is the
957	+	* faulting address so these entries correspond exactly to
958	+	* how the code and sub-code are used on Mach.
959	+	*
960	+	* This is a MIG interface. No code in Basilisk II should
961	+	* call this directley. This has to have external C
962	+	* linkage because that is what exc_server expects.
963	+	*/
964	+	kern_return_t
965	+	catch_exception_raise(mach_port_t exception_port,
966	+	mach_port_t thread,
967	+	mach_port_t task,
968	+	exception_type_t exception,
969	+	exception_data_t code,
970	+	mach_msg_type_number_t codeCount)
971	+	{
972	+	ppc_thread_state_t state;
973	+	kern_return_t krc;
974	+
975	+	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
976	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
977	+	return KERN_SUCCESS;
978	+	}
979	+
980	+	// In Mach we do not need to remove the exception handler.
981	+	// If we forward the exception, eventually some exception handler
982	+	// will take care of this exception.
983	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
984	+
985	+	return krc;
986	+	}
987	+	#endif
988	+
989		#ifdef HAVE_SIGSEGV_RECOVERY
990	+	// Handle bad memory accesses with signal handler
991		static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
992		{
993	<	// Call user's handler and reinstall the global handler, if required
994	<	if (sigsegv_user_handler((sigsegv_address_t)SIGSEGV_FAULT_ADDRESS, (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION)) {
993	>	// Call handler and reinstall the global handler, if required
994	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
995		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
996		sigsegv_do_install_handler(sig);
997		#endif
998	+	return;
999		}
1000	<	else {
1001	<	// FAIL: reinstall default handler for "safe" crash
1000	>
1001	>	// Failure: reinstall default handler for "safe" crash
1002		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1003	<	SIGSEGV_ALL_SIGNALS
1003	>	SIGSEGV_ALL_SIGNALS
1004		#undef FAULT_HANDLER
298	–	}
1005		}
1006		#endif
1007
#	Line 309 | Line 1015 | static bool sigsegv_do_install_handler(i
1015		{
1016		// Setup SIGSEGV handler to process writes to frame buffer
1017		#ifdef HAVE_SIGACTION
1018	<	struct sigaction vosf_sa;
1019	<	sigemptyset(&vosf_sa.sa_mask);
1020	<	vosf_sa.sa_sigaction = sigsegv_handler;
1021	<	vosf_sa.sa_flags = SA_SIGINFO;
1022	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1018	>	struct sigaction sigsegv_sa;
1019	>	sigemptyset(&sigsegv_sa.sa_mask);
1020	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1021	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1022	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1023		#else
1024		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1025		#endif
#	Line 325 | Line 1031 | static bool sigsegv_do_install_handler(i
1031		{
1032		// Setup SIGSEGV handler to process writes to frame buffer
1033		#ifdef HAVE_SIGACTION
1034	<	struct sigaction vosf_sa;
1035	<	sigemptyset(&vosf_sa.sa_mask);
1036	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1034	>	struct sigaction sigsegv_sa;
1035	>	sigemptyset(&sigsegv_sa.sa_mask);
1036	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1037	>	sigsegv_sa.sa_flags = 0;
1038		#if !EMULATED_68K && defined(__NetBSD__)
1039	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1040	<	vosf_sa.sa_flags = SA_ONSTACK;
334	<	#else
335	<	vosf_sa.sa_flags = 0;
1039	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1040	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1041		#endif
1042	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1042	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1043		#else
1044		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1045		#endif
1046		}
1047		#endif
1048
1049	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
1049	>	#if defined(HAVE_MACH_EXCEPTIONS)
1050	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1051		{
1052	<	#ifdef HAVE_SIGSEGV_RECOVERY
1053	<	sigsegv_user_handler = handler;
1052	>	/*
1053	>	* Except for the exception port functions, this should be
1054	>	* pretty much stock Mach. If later you choose to support
1055	>	* other Mach's besides Darwin, just check for __MACH__
1056	>	* here and __APPLE__ where the actual differences are.
1057	>	*/
1058	>	#if defined(__APPLE__) && defined(__MACH__)
1059	>	if (sigsegv_fault_handler != NULL) {
1060	>	sigsegv_fault_handler = handler;
1061	>	return true;
1062	>	}
1063	>
1064	>	kern_return_t krc;
1065	>
1066	>	// create the the exception port
1067	>	krc = mach_port_allocate(mach_task_self(),
1068	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1069	>	if (krc != KERN_SUCCESS) {
1070	>	mach_error("mach_port_allocate", krc);
1071	>	return false;
1072	>	}
1073	>
1074	>	// add a port send right
1075	>	krc = mach_port_insert_right(mach_task_self(),
1076	>	_exceptionPort, _exceptionPort,
1077	>	MACH_MSG_TYPE_MAKE_SEND);
1078	>	if (krc != KERN_SUCCESS) {
1079	>	mach_error("mach_port_insert_right", krc);
1080	>	return false;
1081	>	}
1082	>
1083	>	// get the old exception ports
1084	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1085	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1086	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1087	>	if (krc != KERN_SUCCESS) {
1088	>	mach_error("thread_get_exception_ports", krc);
1089	>	return false;
1090	>	}
1091	>
1092	>	// set the new exception port
1093	>	//
1094	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1095	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1096	>	// message, but it turns out that in the common case this is not
1097	>	// neccessary. If we need it we can later ask for it from the
1098	>	// suspended thread.
1099	>	//
1100	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1101	>	// counter in the thread state.  The comments in the header file
1102	>	// seem to imply that you can count on the GPR's on an exception
1103	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1104	>	// you have to ask for all of the GPR's anyway just to get the
1105	>	// program counter. In any case because of update effective
1106	>	// address from immediate and update address from effective
1107	>	// addresses of ra and rb modes (as good an name as any for these
1108	>	// addressing modes) used in PPC instructions, you will need the
1109	>	// GPR state anyway.
1110	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1111	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1112	>	if (krc != KERN_SUCCESS) {
1113	>	mach_error("thread_set_exception_ports", krc);
1114	>	return false;
1115	>	}
1116	>
1117	>	// create the exception handler thread
1118	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1119	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1120	>	return false;
1121	>	}
1122	>
1123	>	// do not care about the exception thread any longer, let is run standalone
1124	>	(void)pthread_detach(exc_thread);
1125	>
1126	>	sigsegv_fault_handler = handler;
1127	>	return true;
1128	>	#else
1129	>	return false;
1130	>	#endif
1131	>	}
1132	>	#endif
1133	>
1134	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1135	>	{
1136	>	#if defined(HAVE_SIGSEGV_RECOVERY)
1137		bool success = true;
1138		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1139		SIGSEGV_ALL_SIGNALS
1140		#undef FAULT_HANDLER
1141	+	if (success)
1142	+	sigsegv_fault_handler = handler;
1143		return success;
1144	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1145	+	return sigsegv_do_install_handler(handler);
1146		#else
1147		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1148		return false;
#	Line 363 | Line 1156 | bool sigsegv_install_handler(sigsegv_han
1156
1157		void sigsegv_deinstall_handler(void)
1158		{
1159	+	// We do nothing for Mach exceptions, the thread would need to be
1160	+	// suspended if not already so, and we might mess with other
1161	+	// exception handlers that came after we registered ours. There is
1162	+	// no need to remove the exception handler, in fact this function is
1163	+	// not called anywhere in Basilisk II.
1164		#ifdef HAVE_SIGSEGV_RECOVERY
1165	<	sigsegv_user_handler = 0;
1165	>	sigsegv_fault_handler = 0;
1166		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1167		SIGSEGV_ALL_SIGNALS
1168		#undef FAULT_HANDLER
1169		#endif
1170		}
1171
1172	+
1173	+	/*
1174	+	*  Set callback function when we cannot handle the fault
1175	+	*/
1176	+
1177	+	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
1178	+	{
1179	+	sigsegv_state_dumper = handler;
1180	+	}
1181	+
1182	+
1183		/*
1184		*  Test program used for configure/test
1185		*/
#	Line 386 | Line 1195 | static int page_size;
1195		static volatile char * page = 0;
1196		static volatile int handler_called = 0;
1197
1198	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1198	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1199		{
1200		handler_called++;
1201		if ((fault_address - 123) != page)
1202	<	exit(1);
1202	>	exit(10);
1203		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
1204	<	exit(1);
1205	<	return true;
1204	>	exit(11);
1205	>	return SIGSEGV_RETURN_SUCCESS;
1206		}
1207
1208	+	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1209	+	#ifdef __GNUC__
1210	+	// Code range where we expect the fault to come from
1211	+	static void *b_region, *e_region;
1212	+	#endif
1213	+
1214	+	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1215	+	{
1216	+	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1217	+	#ifdef __GNUC__
1218	+	// Make sure reported fault instruction address falls into
1219	+	// expected code range
1220	+	if (instruction_address != SIGSEGV_INVALID_PC
1221	+	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1222	+	(instruction_address >= (sigsegv_address_t)e_region)))
1223	+	return SIGSEGV_RETURN_FAILURE;
1224	+	#endif
1225	+	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1226	+	}
1227	+
1228	+	return SIGSEGV_RETURN_FAILURE;
1229	+	}
1230	+	#endif
1231	+
1232		int main(void)
1233		{
1234		if (vm_init() < 0)
#	Line 403 | Line 1236 | int main(void)
1236
1237		page_size = getpagesize();
1238		if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
1239	<	return 1;
1239	>	return 2;
1240
1241		if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
1242	<	return 1;
1242	>	return 3;
1243
1244		if (!sigsegv_install_handler(sigsegv_test_handler))
1245	<	return 1;
1245	>	return 4;
1246
1247		page[123] = 45;
1248		page[123] = 45;
1249
1250		if (handler_called != 1)
1251	<	return 1;
1251	>	return 5;
1252	>
1253	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1254	>	if (!sigsegv_install_handler(sigsegv_insn_handler))
1255	>	return 6;
1256	>
1257	>	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
1258	>	return 7;
1259	>
1260	>	for (int i = 0; i < page_size; i++)
1261	>	page[i] = (i + 1) % page_size;
1262	>
1263	>	if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1264	>	return 8;
1265	>
1266	>	#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
1267	>	const unsigned int TAG = 0x12345678;                    \
1268	>	TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
1269	>	volatile unsigned int effect = data + TAG;              \
1270	>	if (effect != TAG)                                                              \
1271	>	return 9;                                                                       \
1272	>	} while (0)
1273	>
1274	>	#ifdef __GNUC__
1275	>	b_region = &&L_b_region;
1276	>	e_region = &&L_e_region;
1277	>	#endif
1278	>	L_b_region:
1279	>	TEST_SKIP_INSTRUCTION(unsigned char);
1280	>	TEST_SKIP_INSTRUCTION(unsigned short);
1281	>	TEST_SKIP_INSTRUCTION(unsigned int);
1282	>	L_e_region:
1283	>	#endif
1284
1285		vm_exit();
1286		return 0;

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