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

Comparing BasiliskII/src/Unix/sigsegv.cpp (file contents):
Revision 1.9 by gbeauche, 2002-03-16T21:36:12Z vs.
Revision 1.28 by gbeauche, 2003-10-12T21:41:19Z

#	Line 4 | Line 4
4		*  Derived from Bruno Haible's work on his SIGSEGV library for clisp
5		*  <http://clisp.sourceforge.net/>
6		*
7	+	*  MacOS X support derived from the post by Timothy J. Wood to the
8	+	*  omnigroup macosx-dev list:
9	+	*    Mach Exception Handlers 101 (Was Re: ptrace, gdb)
10	+	*    tjw@omnigroup.com Sun, 4 Jun 2000
11	+	*    www.omnigroup.com/mailman/archive/macosx-dev/2000-June/002030.html
12	+	*
13		*  Basilisk II (C) 1997-2002 Christian Bauer
14		*
15		*  This program is free software; you can redistribute it and/or modify
#	Line 29 | Line 35
35		#include "config.h"
36		#endif
37
38	+	#include <list>
39		#include <signal.h>
40		#include "sigsegv.h"
41
42	+	#ifndef NO_STD_NAMESPACE
43	+	using std::list;
44	+	#endif
45	+
46		// Return value type of a signal handler (standard type if not defined)
47		#ifndef RETSIGTYPE
48		#define RETSIGTYPE void
#	Line 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_ARGS      sig, sip, scp
223		#define SIGSEGV_FAULT_ADDRESS                   sip->si_addr
224	+	#if defined(__NetBSD__) || defined(__FreeBSD__)
225	+	#if (defined(i386) || defined(__i386__))
226	+	#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_eip)
227	+	#define SIGSEGV_REGISTER_FILE                   ((unsigned int *)&(((struct sigcontext *)scp)->sc_edi)) /* EDI is the first GPR (even below EIP) in sigcontext */
228	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
229	+	#endif
230	+	#endif
231		#if defined(__linux__)
232		#if (defined(i386) || defined(__i386__))
233		#include <sys/ucontext.h>
234	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */
234	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
235	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[14] /* should use REG_EIP instead */
236	>	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)SIGSEGV_CONTEXT_REGS
237	>	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
238	>	#endif
239	>	#if (defined(x86_64) || defined(__x86_64__))
240	>	#include <sys/ucontext.h>
241	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.gregs)
242	>	#define SIGSEGV_FAULT_INSTRUCTION               SIGSEGV_CONTEXT_REGS[16] /* should use REG_RIP instead */
243	>	#define SIGSEGV_REGISTER_FILE                   (unsigned long *)SIGSEGV_CONTEXT_REGS
244		#endif
245		#if (defined(ia64) || defined(__ia64__))
246		#define SIGSEGV_FAULT_INSTRUCTION               (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
247		#endif
248		#if (defined(powerpc) || defined(__powerpc__))
249		#include <sys/ucontext.h>
250	<	#define SIGSEGV_FAULT_INSTRUCTION               (((ucontext_t *)scp)->uc_mcontext.regs->nip)
250	>	#define SIGSEGV_CONTEXT_REGS                    (((ucontext_t *)scp)->uc_mcontext.regs)
251	>	#define SIGSEGV_FAULT_INSTRUCTION               (SIGSEGV_CONTEXT_REGS->nip)
252	>	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&SIGSEGV_CONTEXT_REGS->nip, (unsigned int *)(SIGSEGV_CONTEXT_REGS->gpr)
253	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
254		#endif
255		#endif
256		#endif
257
258		#if HAVE_SIGCONTEXT_SUBTERFUGE
259	+	#define SIGSEGV_FAULT_HANDLER                   sigsegv_fault_handler
260		// Linux kernels prior to 2.4 ?
261		#if defined(__linux__)
262		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
263		#if (defined(i386) || defined(__i386__))
264		#include <asm/sigcontext.h>
265		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext scs
266	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, scs
267		#define SIGSEGV_FAULT_ADDRESS                   scs.cr2
268		#define SIGSEGV_FAULT_INSTRUCTION               scs.eip
269	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)(&scs)
270	+	#define SIGSEGV_SKIP_INSTRUCTION                ix86_skip_instruction
271		#endif
272		#if (defined(sparc) || defined(__sparc__))
273		#include <asm/sigcontext.h>
274		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp, char *addr
275	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, code, scp, addr
276		#define SIGSEGV_FAULT_ADDRESS                   addr
277		#endif
278		#if (defined(powerpc) || defined(__powerpc__))
279		#include <asm/sigcontext.h>
280		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, struct sigcontext *scp
281	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, scp
282		#define SIGSEGV_FAULT_ADDRESS                   scp->regs->dar
283		#define SIGSEGV_FAULT_INSTRUCTION               scp->regs->nip
284	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->regs->nip, (unsigned int *)(scp->regs->gpr)
285	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
286		#endif
287		#if (defined(alpha) || defined(__alpha__))
288		#include <asm/sigcontext.h>
289		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
290	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, code, scp
291		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
292		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_pc
293
#	Line 115 | Line 304 | static sigsegv_address_t get_fault_addre
304
305		// Irix 5 or 6 on MIPS
306		#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
307	+	#include <ucontext.h>
308		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
309	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, code, scp
310		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_badvaddr
311		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
312		#endif
313
314	+	// HP-UX
315	+	#if (defined(hpux) || defined(__hpux__))
316	+	#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
317	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, code, scp
318	+	#define SIGSEGV_FAULT_ADDRESS                   scp->sc_sl.sl_ss.ss_narrow.ss_cr21
319	+	#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS)
320	+	#endif
321	+
322		// OSF/1 on Alpha
323		#if defined(__osf__)
324	+	#include <ucontext.h>
325		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
326	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, code, scp
327		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_traparg_a0
328		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
329		#endif
#	Line 130 | Line 331 | static sigsegv_address_t get_fault_addre
331		// AIX
332		#if defined(_AIX)
333		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
334	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, code, scp
335		#define SIGSEGV_FAULT_ADDRESS                   scp->sc_jmpbuf.jmp_context.o_vaddr
336		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
337		#endif
#	Line 139 | Line 341 | static sigsegv_address_t get_fault_addre
341		#if (defined(m68k) || defined(__m68k__))
342		#include <m68k/frame.h>
343		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
344	<	#define SIGSEGV_FAULT_ADDRESS                   ({                                                                                                                              \
345	<	struct sigstate {                                                                                                                                                                       \
144	<	int ss_flags;                                                                                                                                                                   \
145	<	struct frame ss_frame;                                                                                                                                                  \
146	<	};                                                                                                                                                                                                      \
147	<	struct sigstate *state = (struct sigstate *)scp->sc_ap;                                                                                         \
148	<	char *fault_addr;                                                                                                                                                                       \
149	<	switch (state->ss_frame.f_format) {                                                                                                                                     \
150	<	case 7:         /* 68040 access error */                                                                                                                                \
151	<	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */    \
152	<	fault_addr = state->ss_frame.f_fmt7.f_fa;                                                                                                               \
153	<	break;                                                                                                                                                                                  \
154	<	default:                                                                                                                                                                                        \
155	<	fault_addr = (char *)code;                                                                                                                                              \
156	<	break;                                                                                                                                                                                  \
157	<	}                                                                                                                                                                                                       \
158	<	fault_addr;                                                                                                                                                                                     \
159	<	})
344	>	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, code, scp
345	>	#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
346		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGSEGV)
347	+
348	+	// Use decoding scheme from BasiliskII/m68k native
349	+	static sigsegv_address_t get_fault_address(struct sigcontext *scp)
350	+	{
351	+	struct sigstate {
352	+	int ss_flags;
353	+	struct frame ss_frame;
354	+	};
355	+	struct sigstate *state = (struct sigstate *)scp->sc_ap;
356	+	char *fault_addr;
357	+	switch (state->ss_frame.f_format) {
358	+	case 7:         /* 68040 access error */
359	+	/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */
360	+	fault_addr = state->ss_frame.f_fmt7.f_fa;
361	+	break;
362	+	default:
363	+	fault_addr = (char *)code;
364	+	break;
365	+	}
366	+	return (sigsegv_address_t)fault_addr;
367	+	}
368		#else
369		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, void *scp, char *addr
370	+	#define SIGSEGV_FAULT_HANDLER_ARGS      sig, code, scp, addr
371		#define SIGSEGV_FAULT_ADDRESS                   addr
372		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
373		#endif
374		#endif
375
376	<	// MacOS X
376	>	// MacOS X, not sure which version this works in. Under 10.1
377	>	// vm_protect does not appear to work from a signal handler. Under
378	>	// 10.2 signal handlers get siginfo type arguments but the si_addr
379	>	// field is the address of the faulting instruction and not the
380	>	// address that caused the SIGBUS. Maybe this works in 10.0? In any
381	>	// case with Mach exception handlers there is a way to do what this
382	>	// was meant to do.
383	>	#ifndef HAVE_MACH_EXCEPTIONS
384		#if defined(__APPLE__) && defined(__MACH__)
385		#if (defined(ppc) || defined(__ppc__))
386		#define SIGSEGV_FAULT_HANDLER_ARGLIST   int sig, int code, struct sigcontext *scp
387	+	#define SIGSEGV_FAULT_HANDLER_ARGS              sig, code, scp
388		#define SIGSEGV_FAULT_ADDRESS                   get_fault_address(scp)
389		#define SIGSEGV_FAULT_INSTRUCTION               scp->sc_ir
390		#define SIGSEGV_ALL_SIGNALS                             FAULT_HANDLER(SIGBUS)
391	+	#define SIGSEGV_REGISTER_FILE                   (unsigned int *)&scp->sc_ir, &((unsigned int *) scp->sc_regs)[2]
392	+	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
393
394	<	// From Boehm's GC 6.0alpha8
177	<	#define EXTRACT_OP1(iw)     (((iw) & 0xFC000000) >> 26)
178	<	#define EXTRACT_OP2(iw)     (((iw) & 0x000007FE) >> 1)
179	<	#define EXTRACT_REGA(iw)    (((iw) & 0x001F0000) >> 16)
180	<	#define EXTRACT_REGB(iw)    (((iw) & 0x03E00000) >> 21)
181	<	#define EXTRACT_REGC(iw)    (((iw) & 0x0000F800) >> 11)
182	<	#define EXTRACT_DISP(iw)    ((short *) &(iw))[1]
183	<
394	>	// Use decoding scheme from SheepShaver
395		static sigsegv_address_t get_fault_address(struct sigcontext *scp)
396		{
397	<	unsigned int   instr = *((unsigned int *) scp->sc_ir);
398	<	unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
399	<	int            disp = 0, tmp;
400	<	unsigned int   baseA = 0, baseB = 0;
401	<	unsigned int   addr, alignmask = 0xFFFFFFFF;
402	<
403	<	switch(EXTRACT_OP1(instr)) {
404	<	case 38:   /* stb */
405	<	case 39:   /* stbu */
406	<	case 54:   /* stfd */
407	<	case 55:   /* stfdu */
408	<	case 52:   /* stfs */
409	<	case 53:   /* stfsu */
410	<	case 44:   /* sth */
411	<	case 45:   /* sthu */
412	<	case 47:   /* stmw */
413	<	case 36:   /* stw */
414	<	case 37:   /* stwu */
415	<	tmp = EXTRACT_REGA(instr);
416	<	if(tmp > 0)
417	<	baseA = regs[tmp];
418	<	disp = EXTRACT_DISP(instr);
397	>	unsigned int   nip = (unsigned int) scp->sc_ir;
398	>	unsigned int * gpr = &((unsigned int *) scp->sc_regs)[2];
399	>	instruction_t  instr;
400	>
401	>	powerpc_decode_instruction(&instr, nip, gpr);
402	>	return (sigsegv_address_t)instr.addr;
403	>	}
404	>	#endif
405	>	#endif
406	>	#endif
407	>	#endif
408	>
409	>	#if HAVE_MACH_EXCEPTIONS
410	>
411	>	// This can easily be extended to other Mach systems, but really who
412	>	// uses HURD (oops GNU/HURD), Darwin/x86, NextStep, Rhapsody, or CMU
413	>	// Mach 2.5/3.0?
414	>	#if defined(__APPLE__) && defined(__MACH__)
415	>
416	>	#include <sys/types.h>
417	>	#include <stdlib.h>
418	>	#include <stdio.h>
419	>	#include <pthread.h>
420	>
421	>	/*
422	>	* If you are familiar with MIG then you will understand the frustration
423	>	* that was necessary to get these embedded into C++ code by hand.
424	>	*/
425	>	extern "C" {
426	>	#include <mach/mach.h>
427	>	#include <mach/mach_error.h>
428	>
429	>	extern boolean_t exc_server(mach_msg_header_t *, mach_msg_header_t *);
430	>	extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t,
431	>	mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
432	>	extern kern_return_t exception_raise(mach_port_t, mach_port_t, mach_port_t,
433	>	exception_type_t, exception_data_t, mach_msg_type_number_t);
434	>	extern kern_return_t exception_raise_state(mach_port_t, exception_type_t,
435	>	exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
436	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
437	>	extern kern_return_t exception_raise_state_identity(mach_port_t, mach_port_t, mach_port_t,
438	>	exception_type_t, exception_data_t, mach_msg_type_number_t, thread_state_flavor_t *,
439	>	thread_state_t, mach_msg_type_number_t, thread_state_t, mach_msg_type_number_t *);
440	>	}
441	>
442	>	// Could make this dynamic by looking for a result of MIG_ARRAY_TOO_LARGE
443	>	#define HANDLER_COUNT 64
444	>
445	>	// structure to tuck away existing exception handlers
446	>	typedef struct _ExceptionPorts {
447	>	mach_msg_type_number_t maskCount;
448	>	exception_mask_t masks[HANDLER_COUNT];
449	>	exception_handler_t handlers[HANDLER_COUNT];
450	>	exception_behavior_t behaviors[HANDLER_COUNT];
451	>	thread_state_flavor_t flavors[HANDLER_COUNT];
452	>	} ExceptionPorts;
453	>
454	>	// exception handler thread
455	>	static pthread_t exc_thread;
456	>
457	>	// place where old exception handler info is stored
458	>	static ExceptionPorts ports;
459	>
460	>	// our exception port
461	>	static mach_port_t _exceptionPort = MACH_PORT_NULL;
462	>
463	>	#define MACH_CHECK_ERROR(name,ret) \
464	>	if (ret != KERN_SUCCESS) { \
465	>	mach_error(#name, ret); \
466	>	exit (1); \
467	>	}
468	>
469	>	#define SIGSEGV_FAULT_ADDRESS                   code[1]
470	>	#define SIGSEGV_FAULT_INSTRUCTION               get_fault_instruction(thread, state)
471	>	#define SIGSEGV_FAULT_HANDLER                   (code[0] == KERN_PROTECTION_FAILURE) && sigsegv_fault_handler
472	>	#define SIGSEGV_FAULT_HANDLER_ARGLIST   mach_port_t thread, exception_data_t code, ppc_thread_state_t *state
473	>	#define SIGSEGV_FAULT_HANDLER_ARGS              thread, code, &state
474	>	#define SIGSEGV_SKIP_INSTRUCTION                powerpc_skip_instruction
475	>	#define SIGSEGV_REGISTER_FILE                   &state->srr0, &state->r0
476	>
477	>	// Given a suspended thread, stuff the current instruction and
478	>	// registers into state.
479	>	//
480	>	// It would have been nice to have this be ppc/x86 independant which
481	>	// could have been done easily with a thread_state_t instead of
482	>	// ppc_thread_state_t, but because of the way this is called it is
483	>	// easier to do it this way.
484	>	#if (defined(ppc) || defined(__ppc__))
485	>	static inline sigsegv_address_t get_fault_instruction(mach_port_t thread, ppc_thread_state_t *state)
486	>	{
487	>	kern_return_t krc;
488	>	mach_msg_type_number_t count;
489	>
490	>	count = MACHINE_THREAD_STATE_COUNT;
491	>	krc = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)state, &count);
492	>	MACH_CHECK_ERROR (thread_get_state, krc);
493	>
494	>	return (sigsegv_address_t)state->srr0;
495	>	}
496	>	#endif
497	>
498	>	// Since there can only be one exception thread running at any time
499	>	// this is not a problem.
500	>	#define MSG_SIZE 512
501	>	static char msgbuf[MSG_SIZE];
502	>	static char replybuf[MSG_SIZE];
503	>
504	>	/*
505	>	* This is the entry point for the exception handler thread. The job
506	>	* of this thread is to wait for exception messages on the exception
507	>	* port that was setup beforehand and to pass them on to exc_server.
508	>	* exc_server is a MIG generated function that is a part of Mach.
509	>	* Its job is to decide what to do with the exception message. In our
510	>	* case exc_server calls catch_exception_raise on our behalf. After
511	>	* exc_server returns, it is our responsibility to send the reply.
512	>	*/
513	>	static void *
514	>	handleExceptions(void *priv)
515	>	{
516	>	mach_msg_header_t *msg, *reply;
517	>	kern_return_t krc;
518	>
519	>	msg = (mach_msg_header_t *)msgbuf;
520	>	reply = (mach_msg_header_t *)replybuf;
521	>
522	>	for (;;) {
523	>	krc = mach_msg(msg, MACH_RCV_MSG, MSG_SIZE, MSG_SIZE,
524	>	_exceptionPort, 0, MACH_PORT_NULL);
525	>	MACH_CHECK_ERROR(mach_msg, krc);
526	>
527	>	if (!exc_server(msg, reply)) {
528	>	fprintf(stderr, "exc_server hated the message\n");
529	>	exit(1);
530	>	}
531	>
532	>	krc = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0,
533	>	msg->msgh_local_port, 0, MACH_PORT_NULL);
534	>	if (krc != KERN_SUCCESS) {
535	>	fprintf(stderr, "Error sending message to original reply port, krc = %d, %s",
536	>	krc, mach_error_string(krc));
537	>	exit(1);
538	>	}
539	>	}
540	>	}
541	>	#endif
542	>	#endif
543	>
544	>
545	>	/*
546	>	*  Instruction skipping
547	>	*/
548	>
549	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
550	>	// Decode and skip X86 instruction
551	>	#if (defined(i386) || defined(__i386__))
552	>	#if defined(__linux__)
553	>	enum {
554	>	X86_REG_EIP = 14,
555	>	X86_REG_EAX = 11,
556	>	X86_REG_ECX = 10,
557	>	X86_REG_EDX = 9,
558	>	X86_REG_EBX = 8,
559	>	X86_REG_ESP = 7,
560	>	X86_REG_EBP = 6,
561	>	X86_REG_ESI = 5,
562	>	X86_REG_EDI = 4
563	>	};
564	>	#endif
565	>	#if defined(__NetBSD__) || defined(__FreeBSD__)
566	>	enum {
567	>	X86_REG_EIP = 10,
568	>	X86_REG_EAX = 7,
569	>	X86_REG_ECX = 6,
570	>	X86_REG_EDX = 5,
571	>	X86_REG_EBX = 4,
572	>	X86_REG_ESP = 13,
573	>	X86_REG_EBP = 2,
574	>	X86_REG_ESI = 1,
575	>	X86_REG_EDI = 0
576	>	};
577	>	#endif
578	>	// FIXME: this is partly redundant with the instruction decoding phase
579	>	// to discover transfer type and register number
580	>	static inline int ix86_step_over_modrm(unsigned char * p)
581	>	{
582	>	int mod = (p[0] >> 6) & 3;
583	>	int rm = p[0] & 7;
584	>	int offset = 0;
585	>
586	>	// ModR/M Byte
587	>	switch (mod) {
588	>	case 0: // [reg]
589	>	if (rm == 5) return 4; // disp32
590		break;
591	<	case 31:
592	<	switch(EXTRACT_OP2(instr)) {
593	<	case 86:    /* dcbf */
594	<	case 54:    /* dcbst */
595	<	case 1014:  /* dcbz */
596	<	case 247:   /* stbux */
597	<	case 215:   /* stbx */
598	<	case 759:   /* stfdux */
599	<	case 727:   /* stfdx */
600	<	case 983:   /* stfiwx */
601	<	case 695:   /* stfsux */
602	<	case 663:   /* stfsx */
603	<	case 918:   /* sthbrx */
604	<	case 439:   /* sthux */
605	<	case 407:   /* sthx */
606	<	case 661:   /* stswx */
607	<	case 662:   /* stwbrx */
608	<	case 150:   /* stwcx. */
609	<	case 183:   /* stwux */
610	<	case 151:   /* stwx */
611	<	case 135:   /* stvebx */
612	<	case 167:   /* stvehx */
613	<	case 199:   /* stvewx */
614	<	case 231:   /* stvx */
615	<	case 487:   /* stvxl */
616	<	tmp = EXTRACT_REGA(instr);
617	<	if(tmp > 0)
618	<	baseA = regs[tmp];
619	<	baseB = regs[EXTRACT_REGC(instr)];
620	<	/* determine Altivec alignment mask */
621	<	switch(EXTRACT_OP2(instr)) {
622	<	case 167:   /* stvehx */
623	<	alignmask = 0xFFFFFFFE;
624	<	break;
625	<	case 199:   /* stvewx */
626	<	alignmask = 0xFFFFFFFC;
627	<	break;
628	<	case 231:   /* stvx */
629	<	alignmask = 0xFFFFFFF0;
630	<	break;
631	<	case 487:  /* stvxl */
632	<	alignmask = 0xFFFFFFF0;
633	<	break;
634	<	}
591	>	case 1: // disp8[reg]
592	>	offset = 1;
593	>	break;
594	>	case 2: // disp32[reg]
595	>	offset = 4;
596	>	break;
597	>	case 3: // register
598	>	return 0;
599	>	}
600	>
601	>	// SIB Byte
602	>	if (rm == 4) {
603	>	if (mod == 0 && (p[1] & 7) == 5)
604	>	offset = 5; // disp32[index]
605	>	else
606	>	offset++;
607	>	}
608	>
609	>	return offset;
610	>	}
611	>
612	>	static bool ix86_skip_instruction(unsigned int * regs)
613	>	{
614	>	unsigned char * eip = (unsigned char *)regs[X86_REG_EIP];
615	>
616	>	if (eip == 0)
617	>	return false;
618	>
619	>	transfer_type_t transfer_type = SIGSEGV_TRANSFER_UNKNOWN;
620	>	transfer_size_t transfer_size = SIZE_LONG;
621	>
622	>	int reg = -1;
623	>	int len = 0;
624	>
625	>	// Operand size prefix
626	>	if (*eip == 0x66) {
627	>	eip++;
628	>	len++;
629	>	transfer_size = SIZE_WORD;
630	>	}
631	>
632	>	// Decode instruction
633	>	switch (eip[0]) {
634	>	case 0x0f:
635	>	switch (eip[1]) {
636	>	case 0xb6: // MOVZX r32, r/m8
637	>	case 0xb7: // MOVZX r32, r/m16
638	>	switch (eip[2] & 0xc0) {
639	>	case 0x80:
640	>	reg = (eip[2] >> 3) & 7;
641	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
642	>	break;
643	>	case 0x40:
644	>	reg = (eip[2] >> 3) & 7;
645	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
646	>	break;
647	>	case 0x00:
648	>	reg = (eip[2] >> 3) & 7;
649	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
650	>	break;
651	>	}
652	>	len += 3 + ix86_step_over_modrm(eip + 2);
653	>	break;
654	>	}
655	>	break;
656	>	case 0x8a: // MOV r8, r/m8
657	>	transfer_size = SIZE_BYTE;
658	>	case 0x8b: // MOV r32, r/m32 (or 16-bit operation)
659	>	switch (eip[1] & 0xc0) {
660	>	case 0x80:
661	>	reg = (eip[1] >> 3) & 7;
662	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
663		break;
664	<	case 725:   /* stswi */
665	<	tmp = EXTRACT_REGA(instr);
666	<	if(tmp > 0)
257	<	baseA = regs[tmp];
664	>	case 0x40:
665	>	reg = (eip[1] >> 3) & 7;
666	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
667		break;
668	<	default:   /* ignore instruction */
669	<	return 0;
668	>	case 0x00:
669	>	reg = (eip[1] >> 3) & 7;
670	>	transfer_type = SIGSEGV_TRANSFER_LOAD;
671		break;
672		}
673	+	len += 2 + ix86_step_over_modrm(eip + 1);
674		break;
675	<	default:   /* ignore instruction */
676	<	return 0;
675	>	case 0x88: // MOV r/m8, r8
676	>	transfer_size = SIZE_BYTE;
677	>	case 0x89: // MOV r/m32, r32 (or 16-bit operation)
678	>	switch (eip[1] & 0xc0) {
679	>	case 0x80:
680	>	reg = (eip[1] >> 3) & 7;
681	>	transfer_type = SIGSEGV_TRANSFER_STORE;
682	>	break;
683	>	case 0x40:
684	>	reg = (eip[1] >> 3) & 7;
685	>	transfer_type = SIGSEGV_TRANSFER_STORE;
686	>	break;
687	>	case 0x00:
688	>	reg = (eip[1] >> 3) & 7;
689	>	transfer_type = SIGSEGV_TRANSFER_STORE;
690	>	break;
691	>	}
692	>	len += 2 + ix86_step_over_modrm(eip + 1);
693		break;
694		}
695	+
696	+	if (transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
697	+	// Unknown machine code, let it crash. Then patch the decoder
698	+	return false;
699	+	}
700	+
701	+	if (transfer_type == SIGSEGV_TRANSFER_LOAD && reg != -1) {
702	+	static const int x86_reg_map[8] = {
703	+	X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX,
704	+	X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI
705	+	};
706	+
707	+	if (reg < 0 || reg >= 8)
708	+	return false;
709	+
710	+	int rloc = x86_reg_map[reg];
711	+	switch (transfer_size) {
712	+	case SIZE_BYTE:
713	+	regs[rloc] = (regs[rloc] & ~0xff);
714	+	break;
715	+	case SIZE_WORD:
716	+	regs[rloc] = (regs[rloc] & ~0xffff);
717	+	break;
718	+	case SIZE_LONG:
719	+	regs[rloc] = 0;
720	+	break;
721	+	}
722	+	}
723	+
724	+	#if DEBUG
725	+	printf("%08x: %s %s access", regs[X86_REG_EIP],
726	+	transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long",
727	+	transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
728	+
729	+	if (reg != -1) {
730	+	static const char * x86_reg_str_map[8] = {
731	+	"eax", "ecx", "edx", "ebx",
732	+	"esp", "ebp", "esi", "edi"
733	+	};
734	+	printf(" %s register %%%s", transfer_type == SIGSEGV_TRANSFER_LOAD ? "to" : "from", x86_reg_str_map[reg]);
735	+	}
736	+	printf(", %d bytes instruction\n", len);
737	+	#endif
738
739	<	addr = (baseA + baseB) + disp;
740	<	addr &= alignmask;
271	<	return (sigsegv_address_t)addr;
739	>	regs[X86_REG_EIP] += len;
740	>	return true;
741		}
742		#endif
743	+
744	+	// Decode and skip PPC instruction
745	+	#if (defined(powerpc) || defined(__powerpc__) || defined(__ppc__))
746	+	static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
747	+	{
748	+	instruction_t instr;
749	+	powerpc_decode_instruction(&instr, *nip_p, regs);
750	+
751	+	if (instr.transfer_type == SIGSEGV_TRANSFER_UNKNOWN) {
752	+	// Unknown machine code, let it crash. Then patch the decoder
753	+	return false;
754	+	}
755	+
756	+	#if DEBUG
757	+	printf("%08x: %s %s access", *nip_p,
758	+	instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
759	+	instr.transfer_type == SIGSEGV_TRANSFER_LOAD ? "read" : "write");
760	+
761	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
762	+	printf(" r%d (ra = %08x)\n", instr.ra, instr.addr);
763	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
764	+	printf(" r%d (rd = 0)\n", instr.rd);
765	+	#endif
766	+
767	+	if (instr.addr_mode == MODE_U || instr.addr_mode == MODE_UX)
768	+	regs[instr.ra] = instr.addr;
769	+	if (instr.transfer_type == SIGSEGV_TRANSFER_LOAD)
770	+	regs[instr.rd] = 0;
771	+
772	+	*nip_p += 4;
773	+	return true;
774	+	}
775		#endif
776		#endif
777
#	Line 289 | Line 790 | static sigsegv_address_t get_fault_addre
790		*  SIGSEGV global handler
791		*/
792
793	+	#if defined(HAVE_SIGSEGV_RECOVERY) || defined(HAVE_MACH_EXCEPTIONS)
794	+	// This function handles the badaccess to memory.
795	+	// It is called from the signal handler or the exception handler.
796	+	static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST)
797	+	{
798	+	sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
799	+	sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
800	+
801	+	// Call user's handler and reinstall the global handler, if required
802	+	switch (sigsegv_fault_handler(fault_address, fault_instruction)) {
803	+	case SIGSEGV_RETURN_SUCCESS:
804	+	return true;
805	+
806	+	#if HAVE_SIGSEGV_SKIP_INSTRUCTION
807	+	case SIGSEGV_RETURN_SKIP_INSTRUCTION:
808	+	// Call the instruction skipper with the register file
809	+	// available
810	+	if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
811	+	#ifdef HAVE_MACH_EXCEPTIONS
812	+	// Unlike UNIX signals where the thread state
813	+	// is modified off of the stack, in Mach we
814	+	// need to actually call thread_set_state to
815	+	// have the register values updated.
816	+	kern_return_t krc;
817	+
818	+	krc = thread_set_state(thread,
819	+	MACHINE_THREAD_STATE, (thread_state_t)state,
820	+	MACHINE_THREAD_STATE_COUNT);
821	+	MACH_CHECK_ERROR (thread_get_state, krc);
822	+	#endif
823	+	return true;
824	+	}
825	+	break;
826	+	#endif
827	+	}
828	+
829	+	// We can't do anything with the fault_address, dump state?
830	+	if (sigsegv_state_dumper != 0)
831	+	sigsegv_state_dumper(fault_address, fault_instruction);
832	+
833	+	return false;
834	+	}
835	+	#endif
836	+
837	+
838	+	/*
839	+	* There are two mechanisms for handling a bad memory access,
840	+	* Mach exceptions and UNIX signals. The implementation specific
841	+	* code appears below. Its reponsibility is to call handle_badaccess
842	+	* which is the routine that handles the fault in an implementation
843	+	* agnostic manner. The implementation specific code below is then
844	+	* reponsible for checking whether handle_badaccess was able
845	+	* to handle the memory access error and perform any implementation
846	+	* specific tasks necessary afterwards.
847	+	*/
848	+
849	+	#ifdef HAVE_MACH_EXCEPTIONS
850	+	/*
851	+	* We need to forward all exceptions that we do not handle.
852	+	* This is important, there are many exceptions that may be
853	+	* handled by other exception handlers. For example debuggers
854	+	* use exceptions and the exception hander is in another
855	+	* process in such a case. (Timothy J. Wood states in his
856	+	* message to the list that he based this code on that from
857	+	* gdb for Darwin.)
858	+	*/
859	+	static inline kern_return_t
860	+	forward_exception(mach_port_t thread_port,
861	+	mach_port_t task_port,
862	+	exception_type_t exception_type,
863	+	exception_data_t exception_data,
864	+	mach_msg_type_number_t data_count,
865	+	ExceptionPorts *oldExceptionPorts)
866	+	{
867	+	kern_return_t kret;
868	+	unsigned int portIndex;
869	+	mach_port_t port;
870	+	exception_behavior_t behavior;
871	+	thread_state_flavor_t flavor;
872	+	thread_state_t thread_state;
873	+	mach_msg_type_number_t thread_state_count;
874	+
875	+	for (portIndex = 0; portIndex < oldExceptionPorts->maskCount; portIndex++) {
876	+	if (oldExceptionPorts->masks[portIndex] & (1 << exception_type)) {
877	+	// This handler wants the exception
878	+	break;
879	+	}
880	+	}
881	+
882	+	if (portIndex >= oldExceptionPorts->maskCount) {
883	+	fprintf(stderr, "No handler for exception_type = %d. Not fowarding\n", exception_type);
884	+	return KERN_FAILURE;
885	+	}
886	+
887	+	port = oldExceptionPorts->handlers[portIndex];
888	+	behavior = oldExceptionPorts->behaviors[portIndex];
889	+	flavor = oldExceptionPorts->flavors[portIndex];
890	+
891	+	/*
892	+	fprintf(stderr, "forwarding exception, port = 0x%x, behaviour = %d, flavor = %d\n", port, behavior, flavor);
893	+	*/
894	+
895	+	if (behavior != EXCEPTION_DEFAULT) {
896	+	thread_state_count = THREAD_STATE_MAX;
897	+	kret = thread_get_state (thread_port, flavor, thread_state,
898	+	&thread_state_count);
899	+	MACH_CHECK_ERROR (thread_get_state, kret);
900	+	}
901	+
902	+	switch (behavior) {
903	+	case EXCEPTION_DEFAULT:
904	+	// fprintf(stderr, "forwarding to exception_raise\n");
905	+	kret = exception_raise(port, thread_port, task_port, exception_type,
906	+	exception_data, data_count);
907	+	MACH_CHECK_ERROR (exception_raise, kret);
908	+	break;
909	+	case EXCEPTION_STATE:
910	+	// fprintf(stderr, "forwarding to exception_raise_state\n");
911	+	kret = exception_raise_state(port, exception_type, exception_data,
912	+	data_count, &flavor,
913	+	thread_state, thread_state_count,
914	+	thread_state, &thread_state_count);
915	+	MACH_CHECK_ERROR (exception_raise_state, kret);
916	+	break;
917	+	case EXCEPTION_STATE_IDENTITY:
918	+	// fprintf(stderr, "forwarding to exception_raise_state_identity\n");
919	+	kret = exception_raise_state_identity(port, thread_port, task_port,
920	+	exception_type, exception_data,
921	+	data_count, &flavor,
922	+	thread_state, thread_state_count,
923	+	thread_state, &thread_state_count);
924	+	MACH_CHECK_ERROR (exception_raise_state_identity, kret);
925	+	break;
926	+	default:
927	+	fprintf(stderr, "forward_exception got unknown behavior\n");
928	+	break;
929	+	}
930	+
931	+	if (behavior != EXCEPTION_DEFAULT) {
932	+	kret = thread_set_state (thread_port, flavor, thread_state,
933	+	thread_state_count);
934	+	MACH_CHECK_ERROR (thread_set_state, kret);
935	+	}
936	+
937	+	return KERN_SUCCESS;
938	+	}
939	+
940	+	/*
941	+	* This is the code that actually handles the exception.
942	+	* It is called by exc_server. For Darwin 5 Apple changed
943	+	* this a bit from how this family of functions worked in
944	+	* Mach. If you are familiar with that it is a little
945	+	* different. The main variation that concerns us here is
946	+	* that code is an array of exception specific codes and
947	+	* codeCount is a count of the number of codes in the code
948	+	* array. In typical Mach all exceptions have a code
949	+	* and sub-code. It happens to be the case that for a
950	+	* EXC_BAD_ACCESS exception the first entry is the type of
951	+	* bad access that occurred and the second entry is the
952	+	* faulting address so these entries correspond exactly to
953	+	* how the code and sub-code are used on Mach.
954	+	*
955	+	* This is a MIG interface. No code in Basilisk II should
956	+	* call this directley. This has to have external C
957	+	* linkage because that is what exc_server expects.
958	+	*/
959	+	kern_return_t
960	+	catch_exception_raise(mach_port_t exception_port,
961	+	mach_port_t thread,
962	+	mach_port_t task,
963	+	exception_type_t exception,
964	+	exception_data_t code,
965	+	mach_msg_type_number_t codeCount)
966	+	{
967	+	ppc_thread_state_t state;
968	+	kern_return_t krc;
969	+
970	+	if ((exception == EXC_BAD_ACCESS)  && (codeCount >= 2)) {
971	+	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS))
972	+	return KERN_SUCCESS;
973	+	}
974	+
975	+	// In Mach we do not need to remove the exception handler.
976	+	// If we forward the exception, eventually some exception handler
977	+	// will take care of this exception.
978	+	krc = forward_exception(thread, task, exception, code, codeCount, &ports);
979	+
980	+	return krc;
981	+	}
982	+	#endif
983	+
984		#ifdef HAVE_SIGSEGV_RECOVERY
985	+	// Handle bad memory accesses with signal handler
986		static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
987		{
988	<	// Call user's handler and reinstall the global handler, if required
989	<	if (sigsegv_user_handler((sigsegv_address_t)SIGSEGV_FAULT_ADDRESS, (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION)) {
988	>	// Call handler and reinstall the global handler, if required
989	>	if (handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGS)) {
990		#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
991		sigsegv_do_install_handler(sig);
992		#endif
993	+	return;
994		}
995	<	else {
996	<	// FAIL: reinstall default handler for "safe" crash
995	>
996	>	// Failure: reinstall default handler for "safe" crash
997		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
998	<	SIGSEGV_ALL_SIGNALS
998	>	SIGSEGV_ALL_SIGNALS
999		#undef FAULT_HANDLER
306	–	}
1000		}
1001		#endif
1002
#	Line 317 | Line 1010 | static bool sigsegv_do_install_handler(i
1010		{
1011		// Setup SIGSEGV handler to process writes to frame buffer
1012		#ifdef HAVE_SIGACTION
1013	<	struct sigaction vosf_sa;
1014	<	sigemptyset(&vosf_sa.sa_mask);
1015	<	vosf_sa.sa_sigaction = sigsegv_handler;
1016	<	vosf_sa.sa_flags = SA_SIGINFO;
1017	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1013	>	struct sigaction sigsegv_sa;
1014	>	sigemptyset(&sigsegv_sa.sa_mask);
1015	>	sigsegv_sa.sa_sigaction = sigsegv_handler;
1016	>	sigsegv_sa.sa_flags = SA_SIGINFO;
1017	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1018		#else
1019		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1020		#endif
#	Line 333 | Line 1026 | static bool sigsegv_do_install_handler(i
1026		{
1027		// Setup SIGSEGV handler to process writes to frame buffer
1028		#ifdef HAVE_SIGACTION
1029	<	struct sigaction vosf_sa;
1030	<	sigemptyset(&vosf_sa.sa_mask);
1031	<	vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
1029	>	struct sigaction sigsegv_sa;
1030	>	sigemptyset(&sigsegv_sa.sa_mask);
1031	>	sigsegv_sa.sa_handler = (signal_handler)sigsegv_handler;
1032	>	sigsegv_sa.sa_flags = 0;
1033		#if !EMULATED_68K && defined(__NetBSD__)
1034	<	sigaddset(&vosf_sa.sa_mask, SIGALRM);
1035	<	vosf_sa.sa_flags = SA_ONSTACK;
342	<	#else
343	<	vosf_sa.sa_flags = 0;
1034	>	sigaddset(&sigsegv_sa.sa_mask, SIGALRM);
1035	>	sigsegv_sa.sa_flags |= SA_ONSTACK;
1036		#endif
1037	<	return (sigaction(sig, &vosf_sa, 0) == 0);
1037	>	return (sigaction(sig, &sigsegv_sa, 0) == 0);
1038		#else
1039		return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
1040		#endif
1041		}
1042		#endif
1043
1044	<	bool sigsegv_install_handler(sigsegv_handler_t handler)
1044	>	#if defined(HAVE_MACH_EXCEPTIONS)
1045	>	static bool sigsegv_do_install_handler(sigsegv_fault_handler_t handler)
1046		{
1047	<	#ifdef HAVE_SIGSEGV_RECOVERY
1048	<	sigsegv_user_handler = handler;
1047	>	/*
1048	>	* Except for the exception port functions, this should be
1049	>	* pretty much stock Mach. If later you choose to support
1050	>	* other Mach's besides Darwin, just check for __MACH__
1051	>	* here and __APPLE__ where the actual differences are.
1052	>	*/
1053	>	#if defined(__APPLE__) && defined(__MACH__)
1054	>	if (sigsegv_fault_handler != NULL) {
1055	>	sigsegv_fault_handler = handler;
1056	>	return true;
1057	>	}
1058	>
1059	>	kern_return_t krc;
1060	>
1061	>	// create the the exception port
1062	>	krc = mach_port_allocate(mach_task_self(),
1063	>	MACH_PORT_RIGHT_RECEIVE, &_exceptionPort);
1064	>	if (krc != KERN_SUCCESS) {
1065	>	mach_error("mach_port_allocate", krc);
1066	>	return false;
1067	>	}
1068	>
1069	>	// add a port send right
1070	>	krc = mach_port_insert_right(mach_task_self(),
1071	>	_exceptionPort, _exceptionPort,
1072	>	MACH_MSG_TYPE_MAKE_SEND);
1073	>	if (krc != KERN_SUCCESS) {
1074	>	mach_error("mach_port_insert_right", krc);
1075	>	return false;
1076	>	}
1077	>
1078	>	// get the old exception ports
1079	>	ports.maskCount = sizeof (ports.masks) / sizeof (ports.masks[0]);
1080	>	krc = thread_get_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, ports.masks,
1081	>	&ports.maskCount, ports.handlers, ports.behaviors, ports.flavors);
1082	>	if (krc != KERN_SUCCESS) {
1083	>	mach_error("thread_get_exception_ports", krc);
1084	>	return false;
1085	>	}
1086	>
1087	>	// set the new exception port
1088	>	//
1089	>	// We could have used EXCEPTION_STATE_IDENTITY instead of
1090	>	// EXCEPTION_DEFAULT to get the thread state in the initial
1091	>	// message, but it turns out that in the common case this is not
1092	>	// neccessary. If we need it we can later ask for it from the
1093	>	// suspended thread.
1094	>	//
1095	>	// Even with THREAD_STATE_NONE, Darwin provides the program
1096	>	// counter in the thread state.  The comments in the header file
1097	>	// seem to imply that you can count on the GPR's on an exception
1098	>	// as well but just to be safe I use MACHINE_THREAD_STATE because
1099	>	// you have to ask for all of the GPR's anyway just to get the
1100	>	// program counter. In any case because of update effective
1101	>	// address from immediate and update address from effective
1102	>	// addresses of ra and rb modes (as good an name as any for these
1103	>	// addressing modes) used in PPC instructions, you will need the
1104	>	// GPR state anyway.
1105	>	krc = thread_set_exception_ports(mach_thread_self(), EXC_MASK_BAD_ACCESS, _exceptionPort,
1106	>	EXCEPTION_DEFAULT, MACHINE_THREAD_STATE);
1107	>	if (krc != KERN_SUCCESS) {
1108	>	mach_error("thread_set_exception_ports", krc);
1109	>	return false;
1110	>	}
1111	>
1112	>	// create the exception handler thread
1113	>	if (pthread_create(&exc_thread, NULL, &handleExceptions, NULL) != 0) {
1114	>	(void)fprintf(stderr, "creation of exception thread failed\n");
1115	>	return false;
1116	>	}
1117	>
1118	>	// do not care about the exception thread any longer, let is run standalone
1119	>	(void)pthread_detach(exc_thread);
1120	>
1121	>	sigsegv_fault_handler = handler;
1122	>	return true;
1123	>	#else
1124	>	return false;
1125	>	#endif
1126	>	}
1127	>	#endif
1128	>
1129	>	bool sigsegv_install_handler(sigsegv_fault_handler_t handler)
1130	>	{
1131	>	#if defined(HAVE_SIGSEGV_RECOVERY)
1132		bool success = true;
1133		#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
1134		SIGSEGV_ALL_SIGNALS
1135		#undef FAULT_HANDLER
1136	+	if (success)
1137	+	sigsegv_fault_handler = handler;
1138		return success;
1139	+	#elif defined(HAVE_MACH_EXCEPTIONS)
1140	+	return sigsegv_do_install_handler(handler);
1141		#else
1142		// FAIL: no siginfo_t nor sigcontext subterfuge is available
1143		return false;
#	Line 371 | Line 1151 | bool sigsegv_install_handler(sigsegv_han
1151
1152		void sigsegv_deinstall_handler(void)
1153		{
1154	+	// We do nothing for Mach exceptions, the thread would need to be
1155	+	// suspended if not already so, and we might mess with other
1156	+	// exception handlers that came after we registered ours. There is
1157	+	// no need to remove the exception handler, in fact this function is
1158	+	// not called anywhere in Basilisk II.
1159		#ifdef HAVE_SIGSEGV_RECOVERY
1160	<	sigsegv_user_handler = 0;
1160	>	sigsegv_fault_handler = 0;
1161		#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
1162		SIGSEGV_ALL_SIGNALS
1163		#undef FAULT_HANDLER
1164		#endif
1165		}
1166
1167	+
1168	+	/*
1169	+	*  Set callback function when we cannot handle the fault
1170	+	*/
1171	+
1172	+	void sigsegv_set_dump_state(sigsegv_state_dumper_t handler)
1173	+	{
1174	+	sigsegv_state_dumper = handler;
1175	+	}
1176	+
1177	+
1178		/*
1179		*  Test program used for configure/test
1180		*/
#	Line 394 | Line 1190 | static int page_size;
1190		static volatile char * page = 0;
1191		static volatile int handler_called = 0;
1192
1193	<	static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1193	>	static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1194		{
1195		handler_called++;
1196		if ((fault_address - 123) != page)
1197		exit(1);
1198		if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
1199		exit(1);
1200	<	return true;
1200	>	return SIGSEGV_RETURN_SUCCESS;
1201	>	}
1202	>
1203	>	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1204	>	#ifdef __GNUC__
1205	>	// Code range where we expect the fault to come from
1206	>	static void *b_region, *e_region;
1207	>	#endif
1208	>
1209	>	static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
1210	>	{
1211	>	if (((unsigned long)fault_address - (unsigned long)page) < page_size) {
1212	>	#ifdef __GNUC__
1213	>	// Make sure reported fault instruction address falls into
1214	>	// expected code range
1215	>	if (instruction_address != SIGSEGV_INVALID_PC
1216	>	&& ((instruction_address <  (sigsegv_address_t)b_region) ||
1217	>	(instruction_address >= (sigsegv_address_t)e_region)))
1218	>	return SIGSEGV_RETURN_FAILURE;
1219	>	#endif
1220	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
1221	>	}
1222	>
1223	>	return SIGSEGV_RETURN_FAILURE;
1224		}
1225	+	#endif
1226
1227		int main(void)
1228		{
#	Line 425 | Line 1245 | int main(void)
1245		if (handler_called != 1)
1246		return 1;
1247
1248	+	#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
1249	+	if (!sigsegv_install_handler(sigsegv_insn_handler))
1250	+	return 1;
1251	+
1252	+	if (vm_protect((char *)page, page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
1253	+	return 1;
1254	+
1255	+	for (int i = 0; i < page_size; i++)
1256	+	page[i] = (i + 1) % page_size;
1257	+
1258	+	if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
1259	+	return 1;
1260	+
1261	+	#define TEST_SKIP_INSTRUCTION(TYPE) do {                                \
1262	+	const unsigned int TAG = 0x12345678;                    \
1263	+	TYPE data = *((TYPE *)(page + sizeof(TYPE)));   \
1264	+	volatile unsigned int effect = data + TAG;              \
1265	+	if (effect != TAG)                                                              \
1266	+	return 1;                                                                       \
1267	+	} while (0)
1268	+
1269	+	#ifdef __GNUC__
1270	+	b_region = &&L_b_region;
1271	+	e_region = &&L_e_region;
1272	+	#endif
1273	+	L_b_region:
1274	+	TEST_SKIP_INSTRUCTION(unsigned char);
1275	+	TEST_SKIP_INSTRUCTION(unsigned short);
1276	+	TEST_SKIP_INSTRUCTION(unsigned int);
1277	+	L_e_region:
1278	+	#endif
1279	+
1280		vm_exit();
1281		return 0;
1282		}

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