| 4 |
|
* Derived from Bruno Haible's work on his SIGSEGV library for clisp |
| 5 |
|
* <http://clisp.sourceforge.net/> |
| 6 |
|
* |
| 7 |
< |
* Basilisk II (C) 1997-2001 Christian Bauer |
| 7 |
> |
* Basilisk II (C) 1997-2002 Christian Bauer |
| 8 |
|
* |
| 9 |
|
* This program is free software; you can redistribute it and/or modify |
| 10 |
|
* it under the terms of the GNU General Public License as published by |
| 40 |
|
// Type of the system signal handler |
| 41 |
|
typedef RETSIGTYPE (*signal_handler)(int); |
| 42 |
|
|
| 43 |
+ |
// Is the fault to be ignored? |
| 44 |
+ |
static bool sigsegv_ignore_fault = false; |
| 45 |
+ |
|
| 46 |
|
// User's SIGSEGV handler |
| 47 |
< |
static sigsegv_handler_t sigsegv_user_handler = 0; |
| 47 |
> |
static sigsegv_fault_handler_t sigsegv_fault_handler = 0; |
| 48 |
> |
|
| 49 |
> |
// Function called to dump state if we can't handle the fault |
| 50 |
> |
static sigsegv_state_dumper_t sigsegv_state_dumper = 0; |
| 51 |
|
|
| 52 |
|
// Actual SIGSEGV handler installer |
| 53 |
|
static bool sigsegv_do_install_handler(int sig); |
| 59 |
|
|
| 60 |
|
#if HAVE_SIGINFO_T |
| 61 |
|
// Generic extended signal handler |
| 62 |
+ |
#if defined(__NetBSD__) || defined(__FreeBSD__) |
| 63 |
+ |
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS) |
| 64 |
+ |
#else |
| 65 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 66 |
< |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, siginfo_t *sip, void * |
| 66 |
> |
#endif |
| 67 |
> |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, siginfo_t *sip, void *scp |
| 68 |
|
#define SIGSEGV_FAULT_ADDRESS sip->si_addr |
| 69 |
+ |
#if defined(__linux__) |
| 70 |
+ |
#if (defined(i386) || defined(__i386__)) |
| 71 |
+ |
#include <sys/ucontext.h> |
| 72 |
+ |
#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t *)scp)->uc_mcontext.gregs[14]) /* should use REG_EIP instead */ |
| 73 |
+ |
#define SIGSEGV_REGISTER_FILE (unsigned long *)(((ucontext_t *)scp)->uc_mcontext.gregs) |
| 74 |
+ |
#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction |
| 75 |
+ |
#endif |
| 76 |
+ |
#if (defined(ia64) || defined(__ia64__)) |
| 77 |
+ |
#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */ |
| 78 |
+ |
#endif |
| 79 |
+ |
#if (defined(powerpc) || defined(__powerpc__)) |
| 80 |
+ |
#include <sys/ucontext.h> |
| 81 |
+ |
#define SIGSEGV_FAULT_INSTRUCTION (((ucontext_t *)scp)->uc_mcontext.regs->nip) |
| 82 |
+ |
#endif |
| 83 |
+ |
#endif |
| 84 |
|
#endif |
| 85 |
|
|
| 86 |
|
#if HAVE_SIGCONTEXT_SUBTERFUGE |
| 92 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext scs |
| 93 |
|
#define SIGSEGV_FAULT_ADDRESS scs.cr2 |
| 94 |
|
#define SIGSEGV_FAULT_INSTRUCTION scs.eip |
| 95 |
+ |
#define SIGSEGV_REGISTER_FILE (unsigned long *)(&scs) |
| 96 |
+ |
#define SIGSEGV_SKIP_INSTRUCTION ix86_skip_instruction |
| 97 |
|
#endif |
| 98 |
|
#if (defined(sparc) || defined(__sparc__)) |
| 99 |
|
#include <asm/sigcontext.h> |
| 100 |
< |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext* scp, char* addr |
| 100 |
> |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp, char *addr |
| 101 |
|
#define SIGSEGV_FAULT_ADDRESS addr |
| 102 |
|
#endif |
| 103 |
|
#if (defined(powerpc) || defined(__powerpc__)) |
| 104 |
|
#include <asm/sigcontext.h> |
| 105 |
< |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext* scp |
| 105 |
> |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp |
| 106 |
|
#define SIGSEGV_FAULT_ADDRESS scp->regs->dar |
| 107 |
|
#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip |
| 108 |
|
#endif |
| 109 |
+ |
#if (defined(alpha) || defined(__alpha__)) |
| 110 |
+ |
#include <asm/sigcontext.h> |
| 111 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 112 |
+ |
#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp) |
| 113 |
+ |
#define SIGSEGV_FAULT_INSTRUCTION scp->sc_pc |
| 114 |
+ |
|
| 115 |
+ |
// From Boehm's GC 6.0alpha8 |
| 116 |
+ |
static sigsegv_address_t get_fault_address(struct sigcontext *scp) |
| 117 |
+ |
{ |
| 118 |
+ |
unsigned int instruction = *((unsigned int *)(scp->sc_pc)); |
| 119 |
+ |
unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f]; |
| 120 |
+ |
fault_address += (signed long)(signed short)(instruction & 0xffff); |
| 121 |
+ |
return (sigsegv_address_t)fault_address; |
| 122 |
+ |
} |
| 123 |
+ |
#endif |
| 124 |
|
#endif |
| 125 |
|
|
| 126 |
|
// Irix 5 or 6 on MIPS |
| 127 |
|
#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4)) |
| 128 |
+ |
#include <ucontext.h> |
| 129 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 130 |
|
#define SIGSEGV_FAULT_ADDRESS scp->sc_badvaddr |
| 131 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 132 |
|
#endif |
| 133 |
|
|
| 134 |
+ |
// HP-UX |
| 135 |
+ |
#if (defined(hpux) || defined(__hpux__)) |
| 136 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 137 |
+ |
#define SIGSEGV_FAULT_ADDRESS scp->sc_sl.sl_ss.ss_narrow.ss_cr21 |
| 138 |
+ |
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) FAULT_HANDLER(SIGBUS) |
| 139 |
+ |
#endif |
| 140 |
+ |
|
| 141 |
|
// OSF/1 on Alpha |
| 142 |
|
#if defined(__osf__) |
| 143 |
+ |
#include <ucontext.h> |
| 144 |
|
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 145 |
|
#define SIGSEGV_FAULT_ADDRESS scp->sc_traparg_a0 |
| 146 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV) |
| 183 |
|
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS) |
| 184 |
|
#endif |
| 185 |
|
#endif |
| 186 |
+ |
|
| 187 |
+ |
// MacOS X |
| 188 |
+ |
#if defined(__APPLE__) && defined(__MACH__) |
| 189 |
+ |
#if (defined(ppc) || defined(__ppc__)) |
| 190 |
+ |
#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp |
| 191 |
+ |
#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp) |
| 192 |
+ |
#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir |
| 193 |
+ |
#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS) |
| 194 |
+ |
|
| 195 |
+ |
// From Boehm's GC 6.0alpha8 |
| 196 |
+ |
#define EXTRACT_OP1(iw) (((iw) & 0xFC000000) >> 26) |
| 197 |
+ |
#define EXTRACT_OP2(iw) (((iw) & 0x000007FE) >> 1) |
| 198 |
+ |
#define EXTRACT_REGA(iw) (((iw) & 0x001F0000) >> 16) |
| 199 |
+ |
#define EXTRACT_REGB(iw) (((iw) & 0x03E00000) >> 21) |
| 200 |
+ |
#define EXTRACT_REGC(iw) (((iw) & 0x0000F800) >> 11) |
| 201 |
+ |
#define EXTRACT_DISP(iw) ((short *) &(iw))[1] |
| 202 |
+ |
|
| 203 |
+ |
static sigsegv_address_t get_fault_address(struct sigcontext *scp) |
| 204 |
+ |
{ |
| 205 |
+ |
unsigned int instr = *((unsigned int *) scp->sc_ir); |
| 206 |
+ |
unsigned int * regs = &((unsigned int *) scp->sc_regs)[2]; |
| 207 |
+ |
int disp = 0, tmp; |
| 208 |
+ |
unsigned int baseA = 0, baseB = 0; |
| 209 |
+ |
unsigned int addr, alignmask = 0xFFFFFFFF; |
| 210 |
+ |
|
| 211 |
+ |
switch(EXTRACT_OP1(instr)) { |
| 212 |
+ |
case 38: /* stb */ |
| 213 |
+ |
case 39: /* stbu */ |
| 214 |
+ |
case 54: /* stfd */ |
| 215 |
+ |
case 55: /* stfdu */ |
| 216 |
+ |
case 52: /* stfs */ |
| 217 |
+ |
case 53: /* stfsu */ |
| 218 |
+ |
case 44: /* sth */ |
| 219 |
+ |
case 45: /* sthu */ |
| 220 |
+ |
case 47: /* stmw */ |
| 221 |
+ |
case 36: /* stw */ |
| 222 |
+ |
case 37: /* stwu */ |
| 223 |
+ |
tmp = EXTRACT_REGA(instr); |
| 224 |
+ |
if(tmp > 0) |
| 225 |
+ |
baseA = regs[tmp]; |
| 226 |
+ |
disp = EXTRACT_DISP(instr); |
| 227 |
+ |
break; |
| 228 |
+ |
case 31: |
| 229 |
+ |
switch(EXTRACT_OP2(instr)) { |
| 230 |
+ |
case 86: /* dcbf */ |
| 231 |
+ |
case 54: /* dcbst */ |
| 232 |
+ |
case 1014: /* dcbz */ |
| 233 |
+ |
case 247: /* stbux */ |
| 234 |
+ |
case 215: /* stbx */ |
| 235 |
+ |
case 759: /* stfdux */ |
| 236 |
+ |
case 727: /* stfdx */ |
| 237 |
+ |
case 983: /* stfiwx */ |
| 238 |
+ |
case 695: /* stfsux */ |
| 239 |
+ |
case 663: /* stfsx */ |
| 240 |
+ |
case 918: /* sthbrx */ |
| 241 |
+ |
case 439: /* sthux */ |
| 242 |
+ |
case 407: /* sthx */ |
| 243 |
+ |
case 661: /* stswx */ |
| 244 |
+ |
case 662: /* stwbrx */ |
| 245 |
+ |
case 150: /* stwcx. */ |
| 246 |
+ |
case 183: /* stwux */ |
| 247 |
+ |
case 151: /* stwx */ |
| 248 |
+ |
case 135: /* stvebx */ |
| 249 |
+ |
case 167: /* stvehx */ |
| 250 |
+ |
case 199: /* stvewx */ |
| 251 |
+ |
case 231: /* stvx */ |
| 252 |
+ |
case 487: /* stvxl */ |
| 253 |
+ |
tmp = EXTRACT_REGA(instr); |
| 254 |
+ |
if(tmp > 0) |
| 255 |
+ |
baseA = regs[tmp]; |
| 256 |
+ |
baseB = regs[EXTRACT_REGC(instr)]; |
| 257 |
+ |
/* determine Altivec alignment mask */ |
| 258 |
+ |
switch(EXTRACT_OP2(instr)) { |
| 259 |
+ |
case 167: /* stvehx */ |
| 260 |
+ |
alignmask = 0xFFFFFFFE; |
| 261 |
+ |
break; |
| 262 |
+ |
case 199: /* stvewx */ |
| 263 |
+ |
alignmask = 0xFFFFFFFC; |
| 264 |
+ |
break; |
| 265 |
+ |
case 231: /* stvx */ |
| 266 |
+ |
alignmask = 0xFFFFFFF0; |
| 267 |
+ |
break; |
| 268 |
+ |
case 487: /* stvxl */ |
| 269 |
+ |
alignmask = 0xFFFFFFF0; |
| 270 |
+ |
break; |
| 271 |
+ |
} |
| 272 |
+ |
break; |
| 273 |
+ |
case 725: /* stswi */ |
| 274 |
+ |
tmp = EXTRACT_REGA(instr); |
| 275 |
+ |
if(tmp > 0) |
| 276 |
+ |
baseA = regs[tmp]; |
| 277 |
+ |
break; |
| 278 |
+ |
default: /* ignore instruction */ |
| 279 |
+ |
return 0; |
| 280 |
+ |
break; |
| 281 |
+ |
} |
| 282 |
+ |
break; |
| 283 |
+ |
default: /* ignore instruction */ |
| 284 |
+ |
return 0; |
| 285 |
+ |
break; |
| 286 |
+ |
} |
| 287 |
+ |
|
| 288 |
+ |
addr = (baseA + baseB) + disp; |
| 289 |
+ |
addr &= alignmask; |
| 290 |
+ |
return (sigsegv_address_t)addr; |
| 291 |
+ |
} |
| 292 |
+ |
#endif |
| 293 |
+ |
#endif |
| 294 |
+ |
#endif |
| 295 |
+ |
|
| 296 |
+ |
#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION |
| 297 |
+ |
// Decode and skip X86 instruction |
| 298 |
+ |
#if (defined(i386) || defined(__i386__)) |
| 299 |
+ |
#if defined(__linux__) |
| 300 |
+ |
enum { |
| 301 |
+ |
X86_REG_EIP = 14, |
| 302 |
+ |
X86_REG_EAX = 11, |
| 303 |
+ |
X86_REG_ECX = 10, |
| 304 |
+ |
X86_REG_EDX = 9, |
| 305 |
+ |
X86_REG_EBX = 8, |
| 306 |
+ |
X86_REG_ESP = 7, |
| 307 |
+ |
X86_REG_EBP = 6, |
| 308 |
+ |
X86_REG_ESI = 5, |
| 309 |
+ |
X86_REG_EDI = 4 |
| 310 |
+ |
}; |
| 311 |
+ |
#endif |
| 312 |
+ |
// FIXME: this is partly redundant with the instruction decoding phase |
| 313 |
+ |
// to discover transfer type and register number |
| 314 |
+ |
static inline int ix86_step_over_modrm(unsigned char * p) |
| 315 |
+ |
{ |
| 316 |
+ |
int mod = (p[0] >> 6) & 3; |
| 317 |
+ |
int rm = p[0] & 7; |
| 318 |
+ |
int offset = 0; |
| 319 |
+ |
|
| 320 |
+ |
// ModR/M Byte |
| 321 |
+ |
switch (mod) { |
| 322 |
+ |
case 0: // [reg] |
| 323 |
+ |
if (rm == 5) return 4; // disp32 |
| 324 |
+ |
break; |
| 325 |
+ |
case 1: // disp8[reg] |
| 326 |
+ |
offset = 1; |
| 327 |
+ |
break; |
| 328 |
+ |
case 2: // disp32[reg] |
| 329 |
+ |
offset = 4; |
| 330 |
+ |
break; |
| 331 |
+ |
case 3: // register |
| 332 |
+ |
return 0; |
| 333 |
+ |
} |
| 334 |
+ |
|
| 335 |
+ |
// SIB Byte |
| 336 |
+ |
if (rm == 4) { |
| 337 |
+ |
if (mod == 0 && (p[1] & 7) == 5) |
| 338 |
+ |
offset = 5; // disp32[index] |
| 339 |
+ |
else |
| 340 |
+ |
offset++; |
| 341 |
+ |
} |
| 342 |
+ |
|
| 343 |
+ |
return offset; |
| 344 |
+ |
} |
| 345 |
+ |
|
| 346 |
+ |
static bool ix86_skip_instruction(sigsegv_address_t fault_instruction, unsigned long * regs) |
| 347 |
+ |
{ |
| 348 |
+ |
unsigned char * eip = (unsigned char *)fault_instruction; |
| 349 |
+ |
|
| 350 |
+ |
if (eip == 0) |
| 351 |
+ |
return false; |
| 352 |
+ |
|
| 353 |
+ |
// Transfer type |
| 354 |
+ |
enum { |
| 355 |
+ |
TYPE_UNKNOWN, |
| 356 |
+ |
TYPE_LOAD, |
| 357 |
+ |
TYPE_STORE |
| 358 |
+ |
} transfer_type = TYPE_UNKNOWN; |
| 359 |
+ |
|
| 360 |
+ |
// Transfer size |
| 361 |
+ |
enum { |
| 362 |
+ |
SIZE_BYTE, |
| 363 |
+ |
SIZE_WORD, |
| 364 |
+ |
SIZE_LONG |
| 365 |
+ |
} transfer_size = SIZE_LONG; |
| 366 |
+ |
|
| 367 |
+ |
int reg = -1; |
| 368 |
+ |
int len = 0; |
| 369 |
+ |
|
| 370 |
+ |
// Operand size prefix |
| 371 |
+ |
if (*eip == 0x66) { |
| 372 |
+ |
eip++; |
| 373 |
+ |
len++; |
| 374 |
+ |
transfer_size = SIZE_WORD; |
| 375 |
+ |
} |
| 376 |
+ |
|
| 377 |
+ |
// Decode instruction |
| 378 |
+ |
switch (eip[0]) { |
| 379 |
+ |
case 0x8a: // MOV r8, r/m8 |
| 380 |
+ |
transfer_size = SIZE_BYTE; |
| 381 |
+ |
case 0x8b: // MOV r32, r/m32 (or 16-bit operation) |
| 382 |
+ |
switch (eip[1] & 0xc0) { |
| 383 |
+ |
case 0x80: |
| 384 |
+ |
reg = (eip[1] >> 3) & 7; |
| 385 |
+ |
transfer_type = TYPE_LOAD; |
| 386 |
+ |
break; |
| 387 |
+ |
case 0x40: |
| 388 |
+ |
reg = (eip[1] >> 3) & 7; |
| 389 |
+ |
transfer_type = TYPE_LOAD; |
| 390 |
+ |
break; |
| 391 |
+ |
case 0x00: |
| 392 |
+ |
reg = (eip[1] >> 3) & 7; |
| 393 |
+ |
transfer_type = TYPE_LOAD; |
| 394 |
+ |
break; |
| 395 |
+ |
} |
| 396 |
+ |
len += 2 + ix86_step_over_modrm(eip + 1); |
| 397 |
+ |
break; |
| 398 |
+ |
case 0x88: // MOV r/m8, r8 |
| 399 |
+ |
transfer_size = SIZE_BYTE; |
| 400 |
+ |
case 0x89: // MOV r/m32, r32 (or 16-bit operation) |
| 401 |
+ |
switch (eip[1] & 0xc0) { |
| 402 |
+ |
case 0x80: |
| 403 |
+ |
reg = (eip[1] >> 3) & 7; |
| 404 |
+ |
transfer_type = TYPE_STORE; |
| 405 |
+ |
break; |
| 406 |
+ |
case 0x40: |
| 407 |
+ |
reg = (eip[1] >> 3) & 7; |
| 408 |
+ |
transfer_type = TYPE_STORE; |
| 409 |
+ |
break; |
| 410 |
+ |
case 0x00: |
| 411 |
+ |
reg = (eip[1] >> 3) & 7; |
| 412 |
+ |
transfer_type = TYPE_STORE; |
| 413 |
+ |
break; |
| 414 |
+ |
} |
| 415 |
+ |
len += 2 + ix86_step_over_modrm(eip + 1); |
| 416 |
+ |
break; |
| 417 |
+ |
} |
| 418 |
+ |
|
| 419 |
+ |
if (transfer_type == TYPE_UNKNOWN) { |
| 420 |
+ |
// Unknown machine code, let it crash. Then patch the decoder |
| 421 |
+ |
return false; |
| 422 |
+ |
} |
| 423 |
+ |
|
| 424 |
+ |
if (transfer_type == TYPE_LOAD && reg != -1) { |
| 425 |
+ |
static const int x86_reg_map[8] = { |
| 426 |
+ |
X86_REG_EAX, X86_REG_ECX, X86_REG_EDX, X86_REG_EBX, |
| 427 |
+ |
X86_REG_ESP, X86_REG_EBP, X86_REG_ESI, X86_REG_EDI |
| 428 |
+ |
}; |
| 429 |
+ |
|
| 430 |
+ |
if (reg < 0 || reg >= 8) |
| 431 |
+ |
return false; |
| 432 |
+ |
|
| 433 |
+ |
int rloc = x86_reg_map[reg]; |
| 434 |
+ |
switch (transfer_size) { |
| 435 |
+ |
case SIZE_BYTE: |
| 436 |
+ |
regs[rloc] = (regs[rloc] & ~0xff); |
| 437 |
+ |
break; |
| 438 |
+ |
case SIZE_WORD: |
| 439 |
+ |
regs[rloc] = (regs[rloc] & ~0xffff); |
| 440 |
+ |
break; |
| 441 |
+ |
case SIZE_LONG: |
| 442 |
+ |
regs[rloc] = 0; |
| 443 |
+ |
break; |
| 444 |
+ |
} |
| 445 |
+ |
} |
| 446 |
+ |
|
| 447 |
+ |
#if DEBUG |
| 448 |
+ |
printf("%08x: %s %s access", regs[X86_REG_EIP], |
| 449 |
+ |
transfer_size == SIZE_BYTE ? "byte" : transfer_size == SIZE_WORD ? "word" : "long", |
| 450 |
+ |
transfer_type == TYPE_LOAD ? "read" : "write"); |
| 451 |
+ |
|
| 452 |
+ |
if (reg != -1) { |
| 453 |
+ |
static const char * x86_reg_str_map[8] = { |
| 454 |
+ |
"eax", "ecx", "edx", "ebx", |
| 455 |
+ |
"esp", "ebp", "esi", "edi" |
| 456 |
+ |
}; |
| 457 |
+ |
printf(" %s register %%%s", transfer_type == TYPE_LOAD ? "to" : "from", x86_reg_str_map[reg]); |
| 458 |
+ |
} |
| 459 |
+ |
printf(", %d bytes instruction\n", len); |
| 460 |
+ |
#endif |
| 461 |
+ |
|
| 462 |
+ |
regs[X86_REG_EIP] += len; |
| 463 |
+ |
return true; |
| 464 |
+ |
} |
| 465 |
+ |
#endif |
| 466 |
|
#endif |
| 467 |
|
|
| 468 |
|
// Fallbacks |
| 483 |
|
#ifdef HAVE_SIGSEGV_RECOVERY |
| 484 |
|
static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST) |
| 485 |
|
{ |
| 486 |
+ |
sigsegv_address_t fault_address = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS; |
| 487 |
+ |
sigsegv_address_t fault_instruction = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION; |
| 488 |
+ |
bool fault_recovered = false; |
| 489 |
+ |
|
| 490 |
|
// Call user's handler and reinstall the global handler, if required |
| 491 |
< |
if (sigsegv_user_handler((sigsegv_address_t)SIGSEGV_FAULT_ADDRESS, (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION)) { |
| 491 |
> |
if (sigsegv_fault_handler(fault_address, fault_instruction)) { |
| 492 |
|
#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL)) |
| 493 |
|
sigsegv_do_install_handler(sig); |
| 494 |
|
#endif |
| 495 |
+ |
fault_recovered = true; |
| 496 |
+ |
} |
| 497 |
+ |
#if HAVE_SIGSEGV_SKIP_INSTRUCTION |
| 498 |
+ |
else if (sigsegv_ignore_fault) { |
| 499 |
+ |
// Call the instruction skipper with the register file available |
| 500 |
+ |
if (SIGSEGV_SKIP_INSTRUCTION(fault_instruction, SIGSEGV_REGISTER_FILE)) |
| 501 |
+ |
fault_recovered = true; |
| 502 |
|
} |
| 503 |
< |
else { |
| 503 |
> |
#endif |
| 504 |
> |
|
| 505 |
> |
if (!fault_recovered) { |
| 506 |
|
// FAIL: reinstall default handler for "safe" crash |
| 507 |
|
#define FAULT_HANDLER(sig) signal(sig, SIG_DFL); |
| 508 |
|
SIGSEGV_ALL_SIGNALS |
| 509 |
|
#undef FAULT_HANDLER |
| 510 |
+ |
|
| 511 |
+ |
// We can't do anything with the fault_address, dump state? |
| 512 |
+ |
if (sigsegv_state_dumper != 0) |
| 513 |
+ |
sigsegv_state_dumper(fault_address, fault_instruction); |
| 514 |
|
} |
| 515 |
|
} |
| 516 |
|
#endif |
| 557 |
|
} |
| 558 |
|
#endif |
| 559 |
|
|
| 560 |
< |
bool sigsegv_install_handler(sigsegv_handler_t handler) |
| 560 |
> |
bool sigsegv_install_handler(sigsegv_fault_handler_t handler) |
| 561 |
|
{ |
| 562 |
|
#ifdef HAVE_SIGSEGV_RECOVERY |
| 563 |
< |
sigsegv_user_handler = handler; |
| 563 |
> |
sigsegv_fault_handler = handler; |
| 564 |
|
bool success = true; |
| 565 |
|
#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig); |
| 566 |
|
SIGSEGV_ALL_SIGNALS |
| 580 |
|
void sigsegv_deinstall_handler(void) |
| 581 |
|
{ |
| 582 |
|
#ifdef HAVE_SIGSEGV_RECOVERY |
| 583 |
< |
sigsegv_user_handler = 0; |
| 583 |
> |
sigsegv_fault_handler = 0; |
| 584 |
|
#define FAULT_HANDLER(sig) signal(sig, SIG_DFL); |
| 585 |
|
SIGSEGV_ALL_SIGNALS |
| 586 |
|
#undef FAULT_HANDLER |
| 587 |
|
#endif |
| 588 |
|
} |
| 589 |
|
|
| 590 |
+ |
|
| 591 |
+ |
/* |
| 592 |
+ |
* SIGSEGV ignore state modifier |
| 593 |
+ |
*/ |
| 594 |
+ |
|
| 595 |
+ |
void sigsegv_set_ignore_state(bool ignore_fault) |
| 596 |
+ |
{ |
| 597 |
+ |
sigsegv_ignore_fault = ignore_fault; |
| 598 |
+ |
} |
| 599 |
+ |
|
| 600 |
+ |
|
| 601 |
+ |
/* |
| 602 |
+ |
* Set callback function when we cannot handle the fault |
| 603 |
+ |
*/ |
| 604 |
+ |
|
| 605 |
+ |
void sigsegv_set_dump_state(sigsegv_state_dumper_t handler) |
| 606 |
+ |
{ |
| 607 |
+ |
sigsegv_state_dumper = handler; |
| 608 |
+ |
} |
| 609 |
+ |
|
| 610 |
+ |
|
| 611 |
|
/* |
| 612 |
|
* Test program used for configure/test |
| 613 |
|
*/ |
| 614 |
|
|
| 615 |
< |
#ifdef CONFIGURE_TEST |
| 615 |
> |
#ifdef CONFIGURE_TEST_SIGSEGV_RECOVERY |
| 616 |
|
#include <stdio.h> |
| 617 |
|
#include <stdlib.h> |
| 249 |
– |
#include <unistd.h> |
| 618 |
|
#include <fcntl.h> |
| 619 |
|
#include <sys/mman.h> |
| 620 |
+ |
#include "vm_alloc.h" |
| 621 |
|
|
| 253 |
– |
static caddr_t page = 0; |
| 622 |
|
static int page_size; |
| 623 |
< |
static int handler_called = 0; |
| 623 |
> |
static volatile char * page = 0; |
| 624 |
> |
static volatile int handler_called = 0; |
| 625 |
|
|
| 626 |
|
static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address) |
| 627 |
|
{ |
| 628 |
|
handler_called++; |
| 629 |
|
if ((fault_address - 123) != page) |
| 630 |
|
exit(1); |
| 631 |
< |
if (mprotect((caddr_t)((unsigned long)fault_address & -page_size), page_size, PROT_READ | PROT_WRITE) != 0) |
| 631 |
> |
if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0) |
| 632 |
|
exit(1); |
| 633 |
|
return true; |
| 634 |
|
} |
| 635 |
|
|
| 636 |
+ |
#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION |
| 637 |
+ |
static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address) |
| 638 |
+ |
{ |
| 639 |
+ |
return false; |
| 640 |
+ |
} |
| 641 |
+ |
#endif |
| 642 |
+ |
|
| 643 |
|
int main(void) |
| 644 |
|
{ |
| 645 |
< |
int zero_fd = open("/dev/zero", O_RDWR); |
| 270 |
< |
if (zero_fd < 0) |
| 645 |
> |
if (vm_init() < 0) |
| 646 |
|
return 1; |
| 647 |
|
|
| 648 |
|
page_size = getpagesize(); |
| 649 |
< |
page = (caddr_t)mmap(0, page_size, PROT_READ, MAP_PRIVATE, zero_fd, 0); |
| 650 |
< |
if (page == MAP_FAILED) |
| 649 |
> |
if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED) |
| 650 |
> |
return 1; |
| 651 |
> |
|
| 652 |
> |
if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0) |
| 653 |
|
return 1; |
| 654 |
|
|
| 655 |
|
if (!sigsegv_install_handler(sigsegv_test_handler)) |
| 661 |
|
if (handler_called != 1) |
| 662 |
|
return 1; |
| 663 |
|
|
| 664 |
+ |
#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION |
| 665 |
+ |
if (!sigsegv_install_handler(sigsegv_insn_handler)) |
| 666 |
+ |
return 1; |
| 667 |
+ |
|
| 668 |
+ |
if (vm_protect((char *)page, page_size, VM_PAGE_WRITE) < 0) |
| 669 |
+ |
return 1; |
| 670 |
+ |
|
| 671 |
+ |
for (int i = 0; i < page_size; i++) |
| 672 |
+ |
page[i] = (i + 1) % page_size; |
| 673 |
+ |
|
| 674 |
+ |
if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0) |
| 675 |
+ |
return 1; |
| 676 |
+ |
|
| 677 |
+ |
sigsegv_set_ignore_state(true); |
| 678 |
+ |
|
| 679 |
+ |
#define TEST_SKIP_INSTRUCTION(TYPE) do { \ |
| 680 |
+ |
const unsigned int TAG = 0x12345678; \ |
| 681 |
+ |
TYPE data = *((TYPE *)(page + sizeof(TYPE))); \ |
| 682 |
+ |
volatile unsigned int effect = data + TAG; \ |
| 683 |
+ |
if (effect != TAG) \ |
| 684 |
+ |
return 1; \ |
| 685 |
+ |
} while (0) |
| 686 |
+ |
|
| 687 |
+ |
TEST_SKIP_INSTRUCTION(unsigned char); |
| 688 |
+ |
TEST_SKIP_INSTRUCTION(unsigned short); |
| 689 |
+ |
TEST_SKIP_INSTRUCTION(unsigned int); |
| 690 |
+ |
#endif |
| 691 |
+ |
|
| 692 |
+ |
vm_exit(); |
| 693 |
|
return 0; |
| 694 |
|
} |
| 695 |
|
#endif |
