Annotation of OpenXM_contrib/gc/os_dep.c, Revision 1.1
1.1 ! maekawa 1: /*
! 2: * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
! 3: * Copyright (c) 1996-1997 by Silicon Graphics. All rights reserved.
! 4: *
! 5: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
! 6: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
! 7: *
! 8: * Permission is hereby granted to use or copy this program
! 9: * for any purpose, provided the above notices are retained on all copies.
! 10: * Permission to modify the code and to distribute modified code is granted,
! 11: * provided the above notices are retained, and a notice that the code was
! 12: * modified is included with the above copyright notice.
! 13: */
! 14:
! 15: # include "gc_priv.h"
! 16:
! 17: # if defined(LINUX) && !defined(POWERPC)
! 18: # include <linux/version.h>
! 19: # if (LINUX_VERSION_CODE <= 0x10400)
! 20: /* Ugly hack to get struct sigcontext_struct definition. Required */
! 21: /* for some early 1.3.X releases. Will hopefully go away soon. */
! 22: /* in some later Linux releases, asm/sigcontext.h may have to */
! 23: /* be included instead. */
! 24: # define __KERNEL__
! 25: # include <asm/signal.h>
! 26: # undef __KERNEL__
! 27: # else
! 28: /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
! 29: /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
! 30: /* prototypes, so we have to include the top-level sigcontext.h to */
! 31: /* make sure the former gets defined to be the latter if appropriate. */
! 32: # include <features.h>
! 33: # if 2 <= __GLIBC__
! 34: # if 0 == __GLIBC_MINOR__
! 35: /* glibc 2.1 no longer has sigcontext.h. But signal.h */
! 36: /* has the right declaration for glibc 2.1. */
! 37: # include <sigcontext.h>
! 38: # endif /* 0 == __GLIBC_MINOR__ */
! 39: # else /* not 2 <= __GLIBC__ */
! 40: /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
! 41: /* one. Check LINUX_VERSION_CODE to see which we should reference. */
! 42: # include <asm/sigcontext.h>
! 43: # endif /* 2 <= __GLIBC__ */
! 44: # endif
! 45: # endif
! 46: # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
! 47: # include <sys/types.h>
! 48: # if !defined(MSWIN32) && !defined(SUNOS4)
! 49: # include <unistd.h>
! 50: # endif
! 51: # endif
! 52:
! 53: # include <stdio.h>
! 54: # include <signal.h>
! 55:
! 56: /* Blatantly OS dependent routines, except for those that are related */
! 57: /* dynamic loading. */
! 58:
! 59: # if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
! 60: # define NEED_FIND_LIMIT
! 61: # endif
! 62:
! 63: # if defined(IRIX_THREADS)
! 64: # define NEED_FIND_LIMIT
! 65: # endif
! 66:
! 67: # if (defined(SUNOS4) & defined(DYNAMIC_LOADING)) && !defined(PCR)
! 68: # define NEED_FIND_LIMIT
! 69: # endif
! 70:
! 71: # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
! 72: # define NEED_FIND_LIMIT
! 73: # endif
! 74:
! 75: # if defined(LINUX) && (defined(POWERPC) || defined(SPARC))
! 76: # define NEED_FIND_LIMIT
! 77: # endif
! 78:
! 79: #ifdef NEED_FIND_LIMIT
! 80: # include <setjmp.h>
! 81: #endif
! 82:
! 83: #ifdef FREEBSD
! 84: # include <machine/trap.h>
! 85: #endif
! 86:
! 87: #ifdef AMIGA
! 88: # include <proto/exec.h>
! 89: # include <proto/dos.h>
! 90: # include <dos/dosextens.h>
! 91: # include <workbench/startup.h>
! 92: #endif
! 93:
! 94: #ifdef MSWIN32
! 95: # define WIN32_LEAN_AND_MEAN
! 96: # define NOSERVICE
! 97: # include <windows.h>
! 98: #endif
! 99:
! 100: #ifdef MACOS
! 101: # include <Processes.h>
! 102: #endif
! 103:
! 104: #ifdef IRIX5
! 105: # include <sys/uio.h>
! 106: # include <malloc.h> /* for locking */
! 107: #endif
! 108: #ifdef USE_MMAP
! 109: # include <sys/types.h>
! 110: # include <sys/mman.h>
! 111: # include <sys/stat.h>
! 112: # include <fcntl.h>
! 113: #endif
! 114:
! 115: #ifdef SUNOS5SIGS
! 116: # include <sys/siginfo.h>
! 117: # undef setjmp
! 118: # undef longjmp
! 119: # define setjmp(env) sigsetjmp(env, 1)
! 120: # define longjmp(env, val) siglongjmp(env, val)
! 121: # define jmp_buf sigjmp_buf
! 122: #endif
! 123:
! 124: #ifdef DJGPP
! 125: /* Apparently necessary for djgpp 2.01. May casuse problems with */
! 126: /* other versions. */
! 127: typedef long unsigned int caddr_t;
! 128: #endif
! 129:
! 130: #ifdef PCR
! 131: # include "il/PCR_IL.h"
! 132: # include "th/PCR_ThCtl.h"
! 133: # include "mm/PCR_MM.h"
! 134: #endif
! 135:
! 136: #if !defined(NO_EXECUTE_PERMISSION)
! 137: # define OPT_PROT_EXEC PROT_EXEC
! 138: #else
! 139: # define OPT_PROT_EXEC 0
! 140: #endif
! 141:
! 142: #if defined(LINUX) && defined(POWERPC)
! 143: ptr_t GC_data_start;
! 144:
! 145: void GC_init_linuxppc()
! 146: {
! 147: extern ptr_t GC_find_limit();
! 148: extern char **_environ;
! 149: /* This may need to be environ, without the underscore, for */
! 150: /* some versions. */
! 151: GC_data_start = GC_find_limit((ptr_t)&_environ, FALSE);
! 152: }
! 153: #endif
! 154:
! 155: #if defined(LINUX) && defined(SPARC)
! 156: ptr_t GC_data_start;
! 157:
! 158: void GC_init_linuxsparc()
! 159: {
! 160: extern ptr_t GC_find_limit();
! 161: extern char **_environ;
! 162: /* This may need to be environ, without the underscore, for */
! 163: /* some versions. */
! 164: GC_data_start = GC_find_limit((ptr_t)&_environ, FALSE);
! 165: }
! 166: #endif
! 167:
! 168: # ifdef OS2
! 169:
! 170: # include <stddef.h>
! 171:
! 172: # if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
! 173:
! 174: struct exe_hdr {
! 175: unsigned short magic_number;
! 176: unsigned short padding[29];
! 177: long new_exe_offset;
! 178: };
! 179:
! 180: #define E_MAGIC(x) (x).magic_number
! 181: #define EMAGIC 0x5A4D
! 182: #define E_LFANEW(x) (x).new_exe_offset
! 183:
! 184: struct e32_exe {
! 185: unsigned char magic_number[2];
! 186: unsigned char byte_order;
! 187: unsigned char word_order;
! 188: unsigned long exe_format_level;
! 189: unsigned short cpu;
! 190: unsigned short os;
! 191: unsigned long padding1[13];
! 192: unsigned long object_table_offset;
! 193: unsigned long object_count;
! 194: unsigned long padding2[31];
! 195: };
! 196:
! 197: #define E32_MAGIC1(x) (x).magic_number[0]
! 198: #define E32MAGIC1 'L'
! 199: #define E32_MAGIC2(x) (x).magic_number[1]
! 200: #define E32MAGIC2 'X'
! 201: #define E32_BORDER(x) (x).byte_order
! 202: #define E32LEBO 0
! 203: #define E32_WORDER(x) (x).word_order
! 204: #define E32LEWO 0
! 205: #define E32_CPU(x) (x).cpu
! 206: #define E32CPU286 1
! 207: #define E32_OBJTAB(x) (x).object_table_offset
! 208: #define E32_OBJCNT(x) (x).object_count
! 209:
! 210: struct o32_obj {
! 211: unsigned long size;
! 212: unsigned long base;
! 213: unsigned long flags;
! 214: unsigned long pagemap;
! 215: unsigned long mapsize;
! 216: unsigned long reserved;
! 217: };
! 218:
! 219: #define O32_FLAGS(x) (x).flags
! 220: #define OBJREAD 0x0001L
! 221: #define OBJWRITE 0x0002L
! 222: #define OBJINVALID 0x0080L
! 223: #define O32_SIZE(x) (x).size
! 224: #define O32_BASE(x) (x).base
! 225:
! 226: # else /* IBM's compiler */
! 227:
! 228: /* A kludge to get around what appears to be a header file bug */
! 229: # ifndef WORD
! 230: # define WORD unsigned short
! 231: # endif
! 232: # ifndef DWORD
! 233: # define DWORD unsigned long
! 234: # endif
! 235:
! 236: # define EXE386 1
! 237: # include <newexe.h>
! 238: # include <exe386.h>
! 239:
! 240: # endif /* __IBMC__ */
! 241:
! 242: # define INCL_DOSEXCEPTIONS
! 243: # define INCL_DOSPROCESS
! 244: # define INCL_DOSERRORS
! 245: # define INCL_DOSMODULEMGR
! 246: # define INCL_DOSMEMMGR
! 247: # include <os2.h>
! 248:
! 249:
! 250: /* Disable and enable signals during nontrivial allocations */
! 251:
! 252: void GC_disable_signals(void)
! 253: {
! 254: ULONG nest;
! 255:
! 256: DosEnterMustComplete(&nest);
! 257: if (nest != 1) ABORT("nested GC_disable_signals");
! 258: }
! 259:
! 260: void GC_enable_signals(void)
! 261: {
! 262: ULONG nest;
! 263:
! 264: DosExitMustComplete(&nest);
! 265: if (nest != 0) ABORT("GC_enable_signals");
! 266: }
! 267:
! 268:
! 269: # else
! 270:
! 271: # if !defined(PCR) && !defined(AMIGA) && !defined(MSWIN32) \
! 272: && !defined(MACOS) && !defined(DJGPP) && !defined(DOS4GW)
! 273:
! 274: # if defined(sigmask) && !defined(UTS4)
! 275: /* Use the traditional BSD interface */
! 276: # define SIGSET_T int
! 277: # define SIG_DEL(set, signal) (set) &= ~(sigmask(signal))
! 278: # define SIG_FILL(set) (set) = 0x7fffffff
! 279: /* Setting the leading bit appears to provoke a bug in some */
! 280: /* longjmp implementations. Most systems appear not to have */
! 281: /* a signal 32. */
! 282: # define SIGSETMASK(old, new) (old) = sigsetmask(new)
! 283: # else
! 284: /* Use POSIX/SYSV interface */
! 285: # define SIGSET_T sigset_t
! 286: # define SIG_DEL(set, signal) sigdelset(&(set), (signal))
! 287: # define SIG_FILL(set) sigfillset(&set)
! 288: # define SIGSETMASK(old, new) sigprocmask(SIG_SETMASK, &(new), &(old))
! 289: # endif
! 290:
! 291: static GC_bool mask_initialized = FALSE;
! 292:
! 293: static SIGSET_T new_mask;
! 294:
! 295: static SIGSET_T old_mask;
! 296:
! 297: static SIGSET_T dummy;
! 298:
! 299: #if defined(PRINTSTATS) && !defined(THREADS)
! 300: # define CHECK_SIGNALS
! 301: int GC_sig_disabled = 0;
! 302: #endif
! 303:
! 304: void GC_disable_signals()
! 305: {
! 306: if (!mask_initialized) {
! 307: SIG_FILL(new_mask);
! 308:
! 309: SIG_DEL(new_mask, SIGSEGV);
! 310: SIG_DEL(new_mask, SIGILL);
! 311: SIG_DEL(new_mask, SIGQUIT);
! 312: # ifdef SIGBUS
! 313: SIG_DEL(new_mask, SIGBUS);
! 314: # endif
! 315: # ifdef SIGIOT
! 316: SIG_DEL(new_mask, SIGIOT);
! 317: # endif
! 318: # ifdef SIGEMT
! 319: SIG_DEL(new_mask, SIGEMT);
! 320: # endif
! 321: # ifdef SIGTRAP
! 322: SIG_DEL(new_mask, SIGTRAP);
! 323: # endif
! 324: mask_initialized = TRUE;
! 325: }
! 326: # ifdef CHECK_SIGNALS
! 327: if (GC_sig_disabled != 0) ABORT("Nested disables");
! 328: GC_sig_disabled++;
! 329: # endif
! 330: SIGSETMASK(old_mask,new_mask);
! 331: }
! 332:
! 333: void GC_enable_signals()
! 334: {
! 335: # ifdef CHECK_SIGNALS
! 336: if (GC_sig_disabled != 1) ABORT("Unmatched enable");
! 337: GC_sig_disabled--;
! 338: # endif
! 339: SIGSETMASK(dummy,old_mask);
! 340: }
! 341:
! 342: # endif /* !PCR */
! 343:
! 344: # endif /*!OS/2 */
! 345:
! 346: /* Ivan Demakov: simplest way (to me) */
! 347: #ifdef DOS4GW
! 348: void GC_disable_signals() { }
! 349: void GC_enable_signals() { }
! 350: #endif
! 351:
! 352: /* Find the page size */
! 353: word GC_page_size;
! 354:
! 355: # ifdef MSWIN32
! 356: void GC_setpagesize()
! 357: {
! 358: SYSTEM_INFO sysinfo;
! 359:
! 360: GetSystemInfo(&sysinfo);
! 361: GC_page_size = sysinfo.dwPageSize;
! 362: }
! 363:
! 364: # else
! 365: # if defined(MPROTECT_VDB) || defined(PROC_VDB) || defined(USE_MMAP)
! 366: void GC_setpagesize()
! 367: {
! 368: GC_page_size = GETPAGESIZE();
! 369: }
! 370: # else
! 371: /* It's acceptable to fake it. */
! 372: void GC_setpagesize()
! 373: {
! 374: GC_page_size = HBLKSIZE;
! 375: }
! 376: # endif
! 377: # endif
! 378:
! 379: /*
! 380: * Find the base of the stack.
! 381: * Used only in single-threaded environment.
! 382: * With threads, GC_mark_roots needs to know how to do this.
! 383: * Called with allocator lock held.
! 384: */
! 385: # ifdef MSWIN32
! 386: # define is_writable(prot) ((prot) == PAGE_READWRITE \
! 387: || (prot) == PAGE_WRITECOPY \
! 388: || (prot) == PAGE_EXECUTE_READWRITE \
! 389: || (prot) == PAGE_EXECUTE_WRITECOPY)
! 390: /* Return the number of bytes that are writable starting at p. */
! 391: /* The pointer p is assumed to be page aligned. */
! 392: /* If base is not 0, *base becomes the beginning of the */
! 393: /* allocation region containing p. */
! 394: word GC_get_writable_length(ptr_t p, ptr_t *base)
! 395: {
! 396: MEMORY_BASIC_INFORMATION buf;
! 397: word result;
! 398: word protect;
! 399:
! 400: result = VirtualQuery(p, &buf, sizeof(buf));
! 401: if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
! 402: if (base != 0) *base = (ptr_t)(buf.AllocationBase);
! 403: protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
! 404: if (!is_writable(protect)) {
! 405: return(0);
! 406: }
! 407: if (buf.State != MEM_COMMIT) return(0);
! 408: return(buf.RegionSize);
! 409: }
! 410:
! 411: ptr_t GC_get_stack_base()
! 412: {
! 413: int dummy;
! 414: ptr_t sp = (ptr_t)(&dummy);
! 415: ptr_t trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
! 416: word size = GC_get_writable_length(trunc_sp, 0);
! 417:
! 418: return(trunc_sp + size);
! 419: }
! 420:
! 421:
! 422: # else
! 423:
! 424: # ifdef OS2
! 425:
! 426: ptr_t GC_get_stack_base()
! 427: {
! 428: PTIB ptib;
! 429: PPIB ppib;
! 430:
! 431: if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
! 432: GC_err_printf0("DosGetInfoBlocks failed\n");
! 433: ABORT("DosGetInfoBlocks failed\n");
! 434: }
! 435: return((ptr_t)(ptib -> tib_pstacklimit));
! 436: }
! 437:
! 438: # else
! 439:
! 440: # ifdef AMIGA
! 441:
! 442: ptr_t GC_get_stack_base()
! 443: {
! 444: extern struct WBStartup *_WBenchMsg;
! 445: extern long __base;
! 446: extern long __stack;
! 447: struct Task *task;
! 448: struct Process *proc;
! 449: struct CommandLineInterface *cli;
! 450: long size;
! 451:
! 452: if ((task = FindTask(0)) == 0) {
! 453: GC_err_puts("Cannot find own task structure\n");
! 454: ABORT("task missing");
! 455: }
! 456: proc = (struct Process *)task;
! 457: cli = BADDR(proc->pr_CLI);
! 458:
! 459: if (_WBenchMsg != 0 || cli == 0) {
! 460: size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
! 461: } else {
! 462: size = cli->cli_DefaultStack * 4;
! 463: }
! 464: return (ptr_t)(__base + GC_max(size, __stack));
! 465: }
! 466:
! 467: # else
! 468:
! 469:
! 470:
! 471: # ifdef NEED_FIND_LIMIT
! 472: /* Some tools to implement HEURISTIC2 */
! 473: # define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
! 474: /* static */ jmp_buf GC_jmp_buf;
! 475:
! 476: /*ARGSUSED*/
! 477: void GC_fault_handler(sig)
! 478: int sig;
! 479: {
! 480: longjmp(GC_jmp_buf, 1);
! 481: }
! 482:
! 483: # ifdef __STDC__
! 484: typedef void (*handler)(int);
! 485: # else
! 486: typedef void (*handler)();
! 487: # endif
! 488:
! 489: # if defined(SUNOS5SIGS) || defined(IRIX5)
! 490: static struct sigaction old_segv_act;
! 491: # if defined(_sigargs) /* !Irix6.x */
! 492: static struct sigaction old_bus_act;
! 493: # endif
! 494: # else
! 495: static handler old_segv_handler, old_bus_handler;
! 496: # endif
! 497:
! 498: void GC_setup_temporary_fault_handler()
! 499: {
! 500: # if defined(SUNOS5SIGS) || defined(IRIX5)
! 501: struct sigaction act;
! 502:
! 503: act.sa_handler = GC_fault_handler;
! 504: act.sa_flags = SA_RESTART | SA_NODEFER;
! 505: /* The presence of SA_NODEFER represents yet another gross */
! 506: /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
! 507: /* interact correctly with -lthread. We hide the confusion */
! 508: /* by making sure that signal handling doesn't affect the */
! 509: /* signal mask. */
! 510:
! 511: (void) sigemptyset(&act.sa_mask);
! 512: # ifdef IRIX_THREADS
! 513: /* Older versions have a bug related to retrieving and */
! 514: /* and setting a handler at the same time. */
! 515: (void) sigaction(SIGSEGV, 0, &old_segv_act);
! 516: (void) sigaction(SIGSEGV, &act, 0);
! 517: # else
! 518: (void) sigaction(SIGSEGV, &act, &old_segv_act);
! 519: # ifdef _sigargs /* Irix 5.x, not 6.x */
! 520: /* Under 5.x, we may get SIGBUS. */
! 521: /* Pthreads doesn't exist under 5.x, so we don't */
! 522: /* have to worry in the threads case. */
! 523: (void) sigaction(SIGBUS, &act, &old_bus_act);
! 524: # endif
! 525: # endif /* IRIX_THREADS */
! 526: # else
! 527: old_segv_handler = signal(SIGSEGV, GC_fault_handler);
! 528: # ifdef SIGBUS
! 529: old_bus_handler = signal(SIGBUS, GC_fault_handler);
! 530: # endif
! 531: # endif
! 532: }
! 533:
! 534: void GC_reset_fault_handler()
! 535: {
! 536: # if defined(SUNOS5SIGS) || defined(IRIX5)
! 537: (void) sigaction(SIGSEGV, &old_segv_act, 0);
! 538: # ifdef _sigargs /* Irix 5.x, not 6.x */
! 539: (void) sigaction(SIGBUS, &old_bus_act, 0);
! 540: # endif
! 541: # else
! 542: (void) signal(SIGSEGV, old_segv_handler);
! 543: # ifdef SIGBUS
! 544: (void) signal(SIGBUS, old_bus_handler);
! 545: # endif
! 546: # endif
! 547: }
! 548:
! 549: /* Return the first nonaddressible location > p (up) or */
! 550: /* the smallest location q s.t. [q,p] is addressible (!up). */
! 551: ptr_t GC_find_limit(p, up)
! 552: ptr_t p;
! 553: GC_bool up;
! 554: {
! 555: static VOLATILE ptr_t result;
! 556: /* Needs to be static, since otherwise it may not be */
! 557: /* preserved across the longjmp. Can safely be */
! 558: /* static since it's only called once, with the */
! 559: /* allocation lock held. */
! 560:
! 561:
! 562: GC_setup_temporary_fault_handler();
! 563: if (setjmp(GC_jmp_buf) == 0) {
! 564: result = (ptr_t)(((word)(p))
! 565: & ~(MIN_PAGE_SIZE-1));
! 566: for (;;) {
! 567: if (up) {
! 568: result += MIN_PAGE_SIZE;
! 569: } else {
! 570: result -= MIN_PAGE_SIZE;
! 571: }
! 572: GC_noop1((word)(*result));
! 573: }
! 574: }
! 575: GC_reset_fault_handler();
! 576: if (!up) {
! 577: result += MIN_PAGE_SIZE;
! 578: }
! 579: return(result);
! 580: }
! 581: # endif
! 582:
! 583:
! 584: ptr_t GC_get_stack_base()
! 585: {
! 586: word dummy;
! 587: ptr_t result;
! 588:
! 589: # define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
! 590:
! 591: # ifdef STACKBOTTOM
! 592: return(STACKBOTTOM);
! 593: # else
! 594: # ifdef HEURISTIC1
! 595: # ifdef STACK_GROWS_DOWN
! 596: result = (ptr_t)((((word)(&dummy))
! 597: + STACKBOTTOM_ALIGNMENT_M1)
! 598: & ~STACKBOTTOM_ALIGNMENT_M1);
! 599: # else
! 600: result = (ptr_t)(((word)(&dummy))
! 601: & ~STACKBOTTOM_ALIGNMENT_M1);
! 602: # endif
! 603: # endif /* HEURISTIC1 */
! 604: # ifdef HEURISTIC2
! 605: # ifdef STACK_GROWS_DOWN
! 606: result = GC_find_limit((ptr_t)(&dummy), TRUE);
! 607: # ifdef HEURISTIC2_LIMIT
! 608: if (result > HEURISTIC2_LIMIT
! 609: && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
! 610: result = HEURISTIC2_LIMIT;
! 611: }
! 612: # endif
! 613: # else
! 614: result = GC_find_limit((ptr_t)(&dummy), FALSE);
! 615: # ifdef HEURISTIC2_LIMIT
! 616: if (result < HEURISTIC2_LIMIT
! 617: && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
! 618: result = HEURISTIC2_LIMIT;
! 619: }
! 620: # endif
! 621: # endif
! 622:
! 623: # endif /* HEURISTIC2 */
! 624: # ifdef STACK_GROWS_DOWN
! 625: if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
! 626: # endif
! 627: return(result);
! 628: # endif /* STACKBOTTOM */
! 629: }
! 630:
! 631: # endif /* ! AMIGA */
! 632: # endif /* ! OS2 */
! 633: # endif /* ! MSWIN32 */
! 634:
! 635: /*
! 636: * Register static data segment(s) as roots.
! 637: * If more data segments are added later then they need to be registered
! 638: * add that point (as we do with SunOS dynamic loading),
! 639: * or GC_mark_roots needs to check for them (as we do with PCR).
! 640: * Called with allocator lock held.
! 641: */
! 642:
! 643: # ifdef OS2
! 644:
! 645: void GC_register_data_segments()
! 646: {
! 647: PTIB ptib;
! 648: PPIB ppib;
! 649: HMODULE module_handle;
! 650: # define PBUFSIZ 512
! 651: UCHAR path[PBUFSIZ];
! 652: FILE * myexefile;
! 653: struct exe_hdr hdrdos; /* MSDOS header. */
! 654: struct e32_exe hdr386; /* Real header for my executable */
! 655: struct o32_obj seg; /* Currrent segment */
! 656: int nsegs;
! 657:
! 658:
! 659: if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
! 660: GC_err_printf0("DosGetInfoBlocks failed\n");
! 661: ABORT("DosGetInfoBlocks failed\n");
! 662: }
! 663: module_handle = ppib -> pib_hmte;
! 664: if (DosQueryModuleName(module_handle, PBUFSIZ, path) != NO_ERROR) {
! 665: GC_err_printf0("DosQueryModuleName failed\n");
! 666: ABORT("DosGetInfoBlocks failed\n");
! 667: }
! 668: myexefile = fopen(path, "rb");
! 669: if (myexefile == 0) {
! 670: GC_err_puts("Couldn't open executable ");
! 671: GC_err_puts(path); GC_err_puts("\n");
! 672: ABORT("Failed to open executable\n");
! 673: }
! 674: if (fread((char *)(&hdrdos), 1, sizeof hdrdos, myexefile) < sizeof hdrdos) {
! 675: GC_err_puts("Couldn't read MSDOS header from ");
! 676: GC_err_puts(path); GC_err_puts("\n");
! 677: ABORT("Couldn't read MSDOS header");
! 678: }
! 679: if (E_MAGIC(hdrdos) != EMAGIC) {
! 680: GC_err_puts("Executable has wrong DOS magic number: ");
! 681: GC_err_puts(path); GC_err_puts("\n");
! 682: ABORT("Bad DOS magic number");
! 683: }
! 684: if (fseek(myexefile, E_LFANEW(hdrdos), SEEK_SET) != 0) {
! 685: GC_err_puts("Seek to new header failed in ");
! 686: GC_err_puts(path); GC_err_puts("\n");
! 687: ABORT("Bad DOS magic number");
! 688: }
! 689: if (fread((char *)(&hdr386), 1, sizeof hdr386, myexefile) < sizeof hdr386) {
! 690: GC_err_puts("Couldn't read MSDOS header from ");
! 691: GC_err_puts(path); GC_err_puts("\n");
! 692: ABORT("Couldn't read OS/2 header");
! 693: }
! 694: if (E32_MAGIC1(hdr386) != E32MAGIC1 || E32_MAGIC2(hdr386) != E32MAGIC2) {
! 695: GC_err_puts("Executable has wrong OS/2 magic number:");
! 696: GC_err_puts(path); GC_err_puts("\n");
! 697: ABORT("Bad OS/2 magic number");
! 698: }
! 699: if ( E32_BORDER(hdr386) != E32LEBO || E32_WORDER(hdr386) != E32LEWO) {
! 700: GC_err_puts("Executable %s has wrong byte order: ");
! 701: GC_err_puts(path); GC_err_puts("\n");
! 702: ABORT("Bad byte order");
! 703: }
! 704: if ( E32_CPU(hdr386) == E32CPU286) {
! 705: GC_err_puts("GC can't handle 80286 executables: ");
! 706: GC_err_puts(path); GC_err_puts("\n");
! 707: EXIT();
! 708: }
! 709: if (fseek(myexefile, E_LFANEW(hdrdos) + E32_OBJTAB(hdr386),
! 710: SEEK_SET) != 0) {
! 711: GC_err_puts("Seek to object table failed: ");
! 712: GC_err_puts(path); GC_err_puts("\n");
! 713: ABORT("Seek to object table failed");
! 714: }
! 715: for (nsegs = E32_OBJCNT(hdr386); nsegs > 0; nsegs--) {
! 716: int flags;
! 717: if (fread((char *)(&seg), 1, sizeof seg, myexefile) < sizeof seg) {
! 718: GC_err_puts("Couldn't read obj table entry from ");
! 719: GC_err_puts(path); GC_err_puts("\n");
! 720: ABORT("Couldn't read obj table entry");
! 721: }
! 722: flags = O32_FLAGS(seg);
! 723: if (!(flags & OBJWRITE)) continue;
! 724: if (!(flags & OBJREAD)) continue;
! 725: if (flags & OBJINVALID) {
! 726: GC_err_printf0("Object with invalid pages?\n");
! 727: continue;
! 728: }
! 729: GC_add_roots_inner(O32_BASE(seg), O32_BASE(seg)+O32_SIZE(seg), FALSE);
! 730: }
! 731: }
! 732:
! 733: # else
! 734:
! 735: # ifdef MSWIN32
! 736: /* Unfortunately, we have to handle win32s very differently from NT, */
! 737: /* Since VirtualQuery has very different semantics. In particular, */
! 738: /* under win32s a VirtualQuery call on an unmapped page returns an */
! 739: /* invalid result. Under GC_register_data_segments is a noop and */
! 740: /* all real work is done by GC_register_dynamic_libraries. Under */
! 741: /* win32s, we cannot find the data segments associated with dll's. */
! 742: /* We rgister the main data segment here. */
! 743: GC_bool GC_win32s = FALSE; /* We're running under win32s. */
! 744:
! 745: GC_bool GC_is_win32s()
! 746: {
! 747: DWORD v = GetVersion();
! 748:
! 749: /* Check that this is not NT, and Windows major version <= 3 */
! 750: return ((v & 0x80000000) && (v & 0xff) <= 3);
! 751: }
! 752:
! 753: void GC_init_win32()
! 754: {
! 755: GC_win32s = GC_is_win32s();
! 756: }
! 757:
! 758: /* Return the smallest address a such that VirtualQuery */
! 759: /* returns correct results for all addresses between a and start. */
! 760: /* Assumes VirtualQuery returns correct information for start. */
! 761: ptr_t GC_least_described_address(ptr_t start)
! 762: {
! 763: MEMORY_BASIC_INFORMATION buf;
! 764: SYSTEM_INFO sysinfo;
! 765: DWORD result;
! 766: LPVOID limit;
! 767: ptr_t p;
! 768: LPVOID q;
! 769:
! 770: GetSystemInfo(&sysinfo);
! 771: limit = sysinfo.lpMinimumApplicationAddress;
! 772: p = (ptr_t)((word)start & ~(GC_page_size - 1));
! 773: for (;;) {
! 774: q = (LPVOID)(p - GC_page_size);
! 775: if ((ptr_t)q > (ptr_t)p /* underflow */ || q < limit) break;
! 776: result = VirtualQuery(q, &buf, sizeof(buf));
! 777: if (result != sizeof(buf) || buf.AllocationBase == 0) break;
! 778: p = (ptr_t)(buf.AllocationBase);
! 779: }
! 780: return(p);
! 781: }
! 782:
! 783: /* Is p the start of either the malloc heap, or of one of our */
! 784: /* heap sections? */
! 785: GC_bool GC_is_heap_base (ptr_t p)
! 786: {
! 787:
! 788: register unsigned i;
! 789:
! 790: # ifndef REDIRECT_MALLOC
! 791: static ptr_t malloc_heap_pointer = 0;
! 792:
! 793: if (0 == malloc_heap_pointer) {
! 794: MEMORY_BASIC_INFORMATION buf;
! 795: register DWORD result = VirtualQuery(malloc(1), &buf, sizeof(buf));
! 796:
! 797: if (result != sizeof(buf)) {
! 798: ABORT("Weird VirtualQuery result");
! 799: }
! 800: malloc_heap_pointer = (ptr_t)(buf.AllocationBase);
! 801: }
! 802: if (p == malloc_heap_pointer) return(TRUE);
! 803: # endif
! 804: for (i = 0; i < GC_n_heap_bases; i++) {
! 805: if (GC_heap_bases[i] == p) return(TRUE);
! 806: }
! 807: return(FALSE);
! 808: }
! 809:
! 810: void GC_register_root_section(ptr_t static_root)
! 811: {
! 812: MEMORY_BASIC_INFORMATION buf;
! 813: SYSTEM_INFO sysinfo;
! 814: DWORD result;
! 815: DWORD protect;
! 816: LPVOID p;
! 817: char * base;
! 818: char * limit, * new_limit;
! 819:
! 820: if (!GC_win32s) return;
! 821: p = base = limit = GC_least_described_address(static_root);
! 822: GetSystemInfo(&sysinfo);
! 823: while (p < sysinfo.lpMaximumApplicationAddress) {
! 824: result = VirtualQuery(p, &buf, sizeof(buf));
! 825: if (result != sizeof(buf) || buf.AllocationBase == 0
! 826: || GC_is_heap_base(buf.AllocationBase)) break;
! 827: new_limit = (char *)p + buf.RegionSize;
! 828: protect = buf.Protect;
! 829: if (buf.State == MEM_COMMIT
! 830: && is_writable(protect)) {
! 831: if ((char *)p == limit) {
! 832: limit = new_limit;
! 833: } else {
! 834: if (base != limit) GC_add_roots_inner(base, limit, FALSE);
! 835: base = p;
! 836: limit = new_limit;
! 837: }
! 838: }
! 839: if (p > (LPVOID)new_limit /* overflow */) break;
! 840: p = (LPVOID)new_limit;
! 841: }
! 842: if (base != limit) GC_add_roots_inner(base, limit, FALSE);
! 843: }
! 844:
! 845: void GC_register_data_segments()
! 846: {
! 847: static char dummy;
! 848:
! 849: GC_register_root_section((ptr_t)(&dummy));
! 850: }
! 851: # else
! 852: # ifdef AMIGA
! 853:
! 854: void GC_register_data_segments()
! 855: {
! 856: extern struct WBStartup *_WBenchMsg;
! 857: struct Process *proc;
! 858: struct CommandLineInterface *cli;
! 859: BPTR myseglist;
! 860: ULONG *data;
! 861:
! 862: if ( _WBenchMsg != 0 ) {
! 863: if ((myseglist = _WBenchMsg->sm_Segment) == 0) {
! 864: GC_err_puts("No seglist from workbench\n");
! 865: return;
! 866: }
! 867: } else {
! 868: if ((proc = (struct Process *)FindTask(0)) == 0) {
! 869: GC_err_puts("Cannot find process structure\n");
! 870: return;
! 871: }
! 872: if ((cli = BADDR(proc->pr_CLI)) == 0) {
! 873: GC_err_puts("No CLI\n");
! 874: return;
! 875: }
! 876: if ((myseglist = cli->cli_Module) == 0) {
! 877: GC_err_puts("No seglist from CLI\n");
! 878: return;
! 879: }
! 880: }
! 881:
! 882: for (data = (ULONG *)BADDR(myseglist); data != 0;
! 883: data = (ULONG *)BADDR(data[0])) {
! 884: # ifdef AMIGA_SKIP_SEG
! 885: if (((ULONG) GC_register_data_segments < (ULONG) &data[1]) ||
! 886: ((ULONG) GC_register_data_segments > (ULONG) &data[1] + data[-1])) {
! 887: # else
! 888: {
! 889: # endif /* AMIGA_SKIP_SEG */
! 890: GC_add_roots_inner((char *)&data[1],
! 891: ((char *)&data[1]) + data[-1], FALSE);
! 892: }
! 893: }
! 894: }
! 895:
! 896:
! 897: # else
! 898:
! 899: # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
! 900: char * GC_SysVGetDataStart(max_page_size, etext_addr)
! 901: int max_page_size;
! 902: int * etext_addr;
! 903: {
! 904: word text_end = ((word)(etext_addr) + sizeof(word) - 1)
! 905: & ~(sizeof(word) - 1);
! 906: /* etext rounded to word boundary */
! 907: word next_page = ((text_end + (word)max_page_size - 1)
! 908: & ~((word)max_page_size - 1));
! 909: word page_offset = (text_end & ((word)max_page_size - 1));
! 910: VOLATILE char * result = (char *)(next_page + page_offset);
! 911: /* Note that this isnt equivalent to just adding */
! 912: /* max_page_size to &etext if &etext is at a page boundary */
! 913:
! 914: GC_setup_temporary_fault_handler();
! 915: if (setjmp(GC_jmp_buf) == 0) {
! 916: /* Try writing to the address. */
! 917: *result = *result;
! 918: GC_reset_fault_handler();
! 919: } else {
! 920: GC_reset_fault_handler();
! 921: /* We got here via a longjmp. The address is not readable. */
! 922: /* This is known to happen under Solaris 2.4 + gcc, which place */
! 923: /* string constants in the text segment, but after etext. */
! 924: /* Use plan B. Note that we now know there is a gap between */
! 925: /* text and data segments, so plan A bought us something. */
! 926: result = (char *)GC_find_limit((ptr_t)(DATAEND) - MIN_PAGE_SIZE, FALSE);
! 927: }
! 928: return((char *)result);
! 929: }
! 930: # endif
! 931:
! 932:
! 933: void GC_register_data_segments()
! 934: {
! 935: # if !defined(PCR) && !defined(SRC_M3) && !defined(NEXT) && !defined(MACOS)
! 936: # if defined(REDIRECT_MALLOC) && defined(SOLARIS_THREADS)
! 937: /* As of Solaris 2.3, the Solaris threads implementation */
! 938: /* allocates the data structure for the initial thread with */
! 939: /* sbrk at process startup. It needs to be scanned, so that */
! 940: /* we don't lose some malloc allocated data structures */
! 941: /* hanging from it. We're on thin ice here ... */
! 942: extern caddr_t sbrk();
! 943:
! 944: GC_add_roots_inner(DATASTART, (char *)sbrk(0), FALSE);
! 945: # else
! 946: GC_add_roots_inner(DATASTART, (char *)(DATAEND), FALSE);
! 947: # endif
! 948: # endif
! 949: # if !defined(PCR) && defined(NEXT)
! 950: GC_add_roots_inner(DATASTART, (char *) get_end(), FALSE);
! 951: # endif
! 952: # if defined(MACOS)
! 953: {
! 954: # if defined(THINK_C)
! 955: extern void* GC_MacGetDataStart(void);
! 956: /* globals begin above stack and end at a5. */
! 957: GC_add_roots_inner((ptr_t)GC_MacGetDataStart(),
! 958: (ptr_t)LMGetCurrentA5(), FALSE);
! 959: # else
! 960: # if defined(__MWERKS__)
! 961: # if !__POWERPC__
! 962: extern void* GC_MacGetDataStart(void);
! 963: /* MATTHEW: Function to handle Far Globals (CW Pro 3) */
! 964: # if __option(far_data)
! 965: extern void* GC_MacGetDataEnd(void);
! 966: # endif
! 967: /* globals begin above stack and end at a5. */
! 968: GC_add_roots_inner((ptr_t)GC_MacGetDataStart(),
! 969: (ptr_t)LMGetCurrentA5(), FALSE);
! 970: /* MATTHEW: Handle Far Globals */
! 971: # if __option(far_data)
! 972: /* Far globals follow he QD globals: */
! 973: GC_add_roots_inner((ptr_t)LMGetCurrentA5(),
! 974: (ptr_t)GC_MacGetDataEnd(), FALSE);
! 975: # endif
! 976: # else
! 977: extern char __data_start__[], __data_end__[];
! 978: GC_add_roots_inner((ptr_t)&__data_start__,
! 979: (ptr_t)&__data_end__, FALSE);
! 980: # endif /* __POWERPC__ */
! 981: # endif /* __MWERKS__ */
! 982: # endif /* !THINK_C */
! 983: }
! 984: # endif /* MACOS */
! 985:
! 986: /* Dynamic libraries are added at every collection, since they may */
! 987: /* change. */
! 988: }
! 989:
! 990: # endif /* ! AMIGA */
! 991: # endif /* ! MSWIN32 */
! 992: # endif /* ! OS2 */
! 993:
! 994: /*
! 995: * Auxiliary routines for obtaining memory from OS.
! 996: */
! 997:
! 998: # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) \
! 999: && !defined(MSWIN32) && !defined(MACOS) && !defined(DOS4GW)
! 1000:
! 1001: # ifdef SUNOS4
! 1002: extern caddr_t sbrk();
! 1003: # endif
! 1004: # ifdef __STDC__
! 1005: # define SBRK_ARG_T ptrdiff_t
! 1006: # else
! 1007: # define SBRK_ARG_T int
! 1008: # endif
! 1009:
! 1010: # ifdef RS6000
! 1011: /* The compiler seems to generate speculative reads one past the end of */
! 1012: /* an allocated object. Hence we need to make sure that the page */
! 1013: /* following the last heap page is also mapped. */
! 1014: ptr_t GC_unix_get_mem(bytes)
! 1015: word bytes;
! 1016: {
! 1017: caddr_t cur_brk = (caddr_t)sbrk(0);
! 1018: caddr_t result;
! 1019: SBRK_ARG_T lsbs = (word)cur_brk & (GC_page_size-1);
! 1020: static caddr_t my_brk_val = 0;
! 1021:
! 1022: if ((SBRK_ARG_T)bytes < 0) return(0); /* too big */
! 1023: if (lsbs != 0) {
! 1024: if((caddr_t)(sbrk(GC_page_size - lsbs)) == (caddr_t)(-1)) return(0);
! 1025: }
! 1026: if (cur_brk == my_brk_val) {
! 1027: /* Use the extra block we allocated last time. */
! 1028: result = (ptr_t)sbrk((SBRK_ARG_T)bytes);
! 1029: if (result == (caddr_t)(-1)) return(0);
! 1030: result -= GC_page_size;
! 1031: } else {
! 1032: result = (ptr_t)sbrk(GC_page_size + (SBRK_ARG_T)bytes);
! 1033: if (result == (caddr_t)(-1)) return(0);
! 1034: }
! 1035: my_brk_val = result + bytes + GC_page_size; /* Always page aligned */
! 1036: return((ptr_t)result);
! 1037: }
! 1038:
! 1039: #else /* Not RS6000 */
! 1040:
! 1041: #if defined(USE_MMAP)
! 1042: /* Tested only under IRIX5 and Solaris 2 */
! 1043:
! 1044: #ifdef USE_MMAP_FIXED
! 1045: # define GC_MMAP_FLAGS MAP_FIXED | MAP_PRIVATE
! 1046: /* Seems to yield better performance on Solaris 2, but can */
! 1047: /* be unreliable if something is already mapped at the address. */
! 1048: #else
! 1049: # define GC_MMAP_FLAGS MAP_PRIVATE
! 1050: #endif
! 1051:
! 1052: ptr_t GC_unix_get_mem(bytes)
! 1053: word bytes;
! 1054: {
! 1055: static GC_bool initialized = FALSE;
! 1056: static int fd;
! 1057: void *result;
! 1058: static ptr_t last_addr = HEAP_START;
! 1059:
! 1060: if (!initialized) {
! 1061: fd = open("/dev/zero", O_RDONLY);
! 1062: initialized = TRUE;
! 1063: }
! 1064: if (bytes & (GC_page_size -1)) ABORT("Bad GET_MEM arg");
! 1065: result = mmap(last_addr, bytes, PROT_READ | PROT_WRITE | OPT_PROT_EXEC,
! 1066: GC_MMAP_FLAGS, fd, 0/* offset */);
! 1067: if (result == MAP_FAILED) return(0);
! 1068: last_addr = (ptr_t)result + bytes + GC_page_size - 1;
! 1069: last_addr = (ptr_t)((word)last_addr & ~(GC_page_size - 1));
! 1070: return((ptr_t)result);
! 1071: }
! 1072:
! 1073: #else /* Not RS6000, not USE_MMAP */
! 1074: ptr_t GC_unix_get_mem(bytes)
! 1075: word bytes;
! 1076: {
! 1077: ptr_t result;
! 1078: # ifdef IRIX5
! 1079: /* Bare sbrk isn't thread safe. Play by malloc rules. */
! 1080: /* The equivalent may be needed on other systems as well. */
! 1081: __LOCK_MALLOC();
! 1082: # endif
! 1083: {
! 1084: ptr_t cur_brk = (ptr_t)sbrk(0);
! 1085: SBRK_ARG_T lsbs = (word)cur_brk & (GC_page_size-1);
! 1086:
! 1087: if ((SBRK_ARG_T)bytes < 0) return(0); /* too big */
! 1088: if (lsbs != 0) {
! 1089: if((ptr_t)sbrk(GC_page_size - lsbs) == (ptr_t)(-1)) return(0);
! 1090: }
! 1091: result = (ptr_t)sbrk((SBRK_ARG_T)bytes);
! 1092: if (result == (ptr_t)(-1)) result = 0;
! 1093: }
! 1094: # ifdef IRIX5
! 1095: __UNLOCK_MALLOC();
! 1096: # endif
! 1097: return(result);
! 1098: }
! 1099:
! 1100: #endif /* Not USE_MMAP */
! 1101: #endif /* Not RS6000 */
! 1102:
! 1103: # endif /* UN*X */
! 1104:
! 1105: # ifdef OS2
! 1106:
! 1107: void * os2_alloc(size_t bytes)
! 1108: {
! 1109: void * result;
! 1110:
! 1111: if (DosAllocMem(&result, bytes, PAG_EXECUTE | PAG_READ |
! 1112: PAG_WRITE | PAG_COMMIT)
! 1113: != NO_ERROR) {
! 1114: return(0);
! 1115: }
! 1116: if (result == 0) return(os2_alloc(bytes));
! 1117: return(result);
! 1118: }
! 1119:
! 1120: # endif /* OS2 */
! 1121:
! 1122:
! 1123: # ifdef MSWIN32
! 1124: word GC_n_heap_bases = 0;
! 1125:
! 1126: ptr_t GC_win32_get_mem(bytes)
! 1127: word bytes;
! 1128: {
! 1129: ptr_t result;
! 1130:
! 1131: if (GC_win32s) {
! 1132: /* VirtualAlloc doesn't like PAGE_EXECUTE_READWRITE. */
! 1133: /* There are also unconfirmed rumors of other */
! 1134: /* problems, so we dodge the issue. */
! 1135: result = (ptr_t) GlobalAlloc(0, bytes + HBLKSIZE);
! 1136: result = (ptr_t)(((word)result + HBLKSIZE) & ~(HBLKSIZE-1));
! 1137: } else {
! 1138: result = (ptr_t) VirtualAlloc(NULL, bytes,
! 1139: MEM_COMMIT | MEM_RESERVE,
! 1140: PAGE_EXECUTE_READWRITE);
! 1141: }
! 1142: if (HBLKDISPL(result) != 0) ABORT("Bad VirtualAlloc result");
! 1143: /* If I read the documentation correctly, this can */
! 1144: /* only happen if HBLKSIZE > 64k or not a power of 2. */
! 1145: if (GC_n_heap_bases >= MAX_HEAP_SECTS) ABORT("Too many heap sections");
! 1146: GC_heap_bases[GC_n_heap_bases++] = result;
! 1147: return(result);
! 1148: }
! 1149:
! 1150: void GC_win32_free_heap ()
! 1151: {
! 1152: if (GC_win32s) {
! 1153: while (GC_n_heap_bases > 0) {
! 1154: GlobalFree (GC_heap_bases[--GC_n_heap_bases]);
! 1155: GC_heap_bases[GC_n_heap_bases] = 0;
! 1156: }
! 1157: }
! 1158: }
! 1159:
! 1160:
! 1161: # endif
! 1162:
! 1163: /* Routine for pushing any additional roots. In THREADS */
! 1164: /* environment, this is also responsible for marking from */
! 1165: /* thread stacks. In the SRC_M3 case, it also handles */
! 1166: /* global variables. */
! 1167: #ifndef THREADS
! 1168: void (*GC_push_other_roots)() = 0;
! 1169: #else /* THREADS */
! 1170:
! 1171: # ifdef PCR
! 1172: PCR_ERes GC_push_thread_stack(PCR_Th_T *t, PCR_Any dummy)
! 1173: {
! 1174: struct PCR_ThCtl_TInfoRep info;
! 1175: PCR_ERes result;
! 1176:
! 1177: info.ti_stkLow = info.ti_stkHi = 0;
! 1178: result = PCR_ThCtl_GetInfo(t, &info);
! 1179: GC_push_all_stack((ptr_t)(info.ti_stkLow), (ptr_t)(info.ti_stkHi));
! 1180: return(result);
! 1181: }
! 1182:
! 1183: /* Push the contents of an old object. We treat this as stack */
! 1184: /* data only becasue that makes it robust against mark stack */
! 1185: /* overflow. */
! 1186: PCR_ERes GC_push_old_obj(void *p, size_t size, PCR_Any data)
! 1187: {
! 1188: GC_push_all_stack((ptr_t)p, (ptr_t)p + size);
! 1189: return(PCR_ERes_okay);
! 1190: }
! 1191:
! 1192:
! 1193: void GC_default_push_other_roots()
! 1194: {
! 1195: /* Traverse data allocated by previous memory managers. */
! 1196: {
! 1197: extern struct PCR_MM_ProcsRep * GC_old_allocator;
! 1198:
! 1199: if ((*(GC_old_allocator->mmp_enumerate))(PCR_Bool_false,
! 1200: GC_push_old_obj, 0)
! 1201: != PCR_ERes_okay) {
! 1202: ABORT("Old object enumeration failed");
! 1203: }
! 1204: }
! 1205: /* Traverse all thread stacks. */
! 1206: if (PCR_ERes_IsErr(
! 1207: PCR_ThCtl_ApplyToAllOtherThreads(GC_push_thread_stack,0))
! 1208: || PCR_ERes_IsErr(GC_push_thread_stack(PCR_Th_CurrThread(), 0))) {
! 1209: ABORT("Thread stack marking failed\n");
! 1210: }
! 1211: }
! 1212:
! 1213: # endif /* PCR */
! 1214:
! 1215: # ifdef SRC_M3
! 1216:
! 1217: # ifdef ALL_INTERIOR_POINTERS
! 1218: --> misconfigured
! 1219: # endif
! 1220:
! 1221:
! 1222: extern void ThreadF__ProcessStacks();
! 1223:
! 1224: void GC_push_thread_stack(start, stop)
! 1225: word start, stop;
! 1226: {
! 1227: GC_push_all_stack((ptr_t)start, (ptr_t)stop + sizeof(word));
! 1228: }
! 1229:
! 1230: /* Push routine with M3 specific calling convention. */
! 1231: GC_m3_push_root(dummy1, p, dummy2, dummy3)
! 1232: word *p;
! 1233: ptr_t dummy1, dummy2;
! 1234: int dummy3;
! 1235: {
! 1236: word q = *p;
! 1237:
! 1238: if ((ptr_t)(q) >= GC_least_plausible_heap_addr
! 1239: && (ptr_t)(q) < GC_greatest_plausible_heap_addr) {
! 1240: GC_push_one_checked(q,FALSE);
! 1241: }
! 1242: }
! 1243:
! 1244: /* M3 set equivalent to RTHeap.TracedRefTypes */
! 1245: typedef struct { int elts[1]; } RefTypeSet;
! 1246: RefTypeSet GC_TracedRefTypes = {{0x1}};
! 1247:
! 1248: /* From finalize.c */
! 1249: extern void GC_push_finalizer_structures();
! 1250:
! 1251: /* From stubborn.c: */
! 1252: # ifdef STUBBORN_ALLOC
! 1253: extern GC_PTR * GC_changing_list_start;
! 1254: # endif
! 1255:
! 1256:
! 1257: void GC_default_push_other_roots()
! 1258: {
! 1259: /* Use the M3 provided routine for finding static roots. */
! 1260: /* This is a bit dubious, since it presumes no C roots. */
! 1261: /* We handle the collector roots explicitly. */
! 1262: {
! 1263: # ifdef STUBBORN_ALLOC
! 1264: GC_push_one(GC_changing_list_start);
! 1265: # endif
! 1266: GC_push_finalizer_structures();
! 1267: RTMain__GlobalMapProc(GC_m3_push_root, 0, GC_TracedRefTypes);
! 1268: }
! 1269: if (GC_words_allocd > 0) {
! 1270: ThreadF__ProcessStacks(GC_push_thread_stack);
! 1271: }
! 1272: /* Otherwise this isn't absolutely necessary, and we have */
! 1273: /* startup ordering problems. */
! 1274: }
! 1275:
! 1276: # endif /* SRC_M3 */
! 1277:
! 1278: # if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
! 1279: || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
! 1280: || defined(IRIX_PCR_THREADS)
! 1281:
! 1282: extern void GC_push_all_stacks();
! 1283:
! 1284: void GC_default_push_other_roots()
! 1285: {
! 1286: GC_push_all_stacks();
! 1287: }
! 1288:
! 1289: # endif /* SOLARIS_THREADS || ... */
! 1290:
! 1291: void (*GC_push_other_roots)() = GC_default_push_other_roots;
! 1292:
! 1293: #endif
! 1294:
! 1295: /*
! 1296: * Routines for accessing dirty bits on virtual pages.
! 1297: * We plan to eventaually implement four strategies for doing so:
! 1298: * DEFAULT_VDB: A simple dummy implementation that treats every page
! 1299: * as possibly dirty. This makes incremental collection
! 1300: * useless, but the implementation is still correct.
! 1301: * PCR_VDB: Use PPCRs virtual dirty bit facility.
! 1302: * PROC_VDB: Use the /proc facility for reading dirty bits. Only
! 1303: * works under some SVR4 variants. Even then, it may be
! 1304: * too slow to be entirely satisfactory. Requires reading
! 1305: * dirty bits for entire address space. Implementations tend
! 1306: * to assume that the client is a (slow) debugger.
! 1307: * MPROTECT_VDB:Protect pages and then catch the faults to keep track of
! 1308: * dirtied pages. The implementation (and implementability)
! 1309: * is highly system dependent. This usually fails when system
! 1310: * calls write to a protected page. We prevent the read system
! 1311: * call from doing so. It is the clients responsibility to
! 1312: * make sure that other system calls are similarly protected
! 1313: * or write only to the stack.
! 1314: */
! 1315:
! 1316: GC_bool GC_dirty_maintained = FALSE;
! 1317:
! 1318: # ifdef DEFAULT_VDB
! 1319:
! 1320: /* All of the following assume the allocation lock is held, and */
! 1321: /* signals are disabled. */
! 1322:
! 1323: /* The client asserts that unallocated pages in the heap are never */
! 1324: /* written. */
! 1325:
! 1326: /* Initialize virtual dirty bit implementation. */
! 1327: void GC_dirty_init()
! 1328: {
! 1329: GC_dirty_maintained = TRUE;
! 1330: }
! 1331:
! 1332: /* Retrieve system dirty bits for heap to a local buffer. */
! 1333: /* Restore the systems notion of which pages are dirty. */
! 1334: void GC_read_dirty()
! 1335: {}
! 1336:
! 1337: /* Is the HBLKSIZE sized page at h marked dirty in the local buffer? */
! 1338: /* If the actual page size is different, this returns TRUE if any */
! 1339: /* of the pages overlapping h are dirty. This routine may err on the */
! 1340: /* side of labelling pages as dirty (and this implementation does). */
! 1341: /*ARGSUSED*/
! 1342: GC_bool GC_page_was_dirty(h)
! 1343: struct hblk *h;
! 1344: {
! 1345: return(TRUE);
! 1346: }
! 1347:
! 1348: /*
! 1349: * The following two routines are typically less crucial. They matter
! 1350: * most with large dynamic libraries, or if we can't accurately identify
! 1351: * stacks, e.g. under Solaris 2.X. Otherwise the following default
! 1352: * versions are adequate.
! 1353: */
! 1354:
! 1355: /* Could any valid GC heap pointer ever have been written to this page? */
! 1356: /*ARGSUSED*/
! 1357: GC_bool GC_page_was_ever_dirty(h)
! 1358: struct hblk *h;
! 1359: {
! 1360: return(TRUE);
! 1361: }
! 1362:
! 1363: /* Reset the n pages starting at h to "was never dirty" status. */
! 1364: void GC_is_fresh(h, n)
! 1365: struct hblk *h;
! 1366: word n;
! 1367: {
! 1368: }
! 1369:
! 1370: /* A call hints that h is about to be written. */
! 1371: /* May speed up some dirty bit implementations. */
! 1372: /*ARGSUSED*/
! 1373: void GC_write_hint(h)
! 1374: struct hblk *h;
! 1375: {
! 1376: }
! 1377:
! 1378: # endif /* DEFAULT_VDB */
! 1379:
! 1380:
! 1381: # ifdef MPROTECT_VDB
! 1382:
! 1383: /*
! 1384: * See DEFAULT_VDB for interface descriptions.
! 1385: */
! 1386:
! 1387: /*
! 1388: * This implementation maintains dirty bits itself by catching write
! 1389: * faults and keeping track of them. We assume nobody else catches
! 1390: * SIGBUS or SIGSEGV. We assume no write faults occur in system calls
! 1391: * except as a result of a read system call. This means clients must
! 1392: * either ensure that system calls do not touch the heap, or must
! 1393: * provide their own wrappers analogous to the one for read.
! 1394: * We assume the page size is a multiple of HBLKSIZE.
! 1395: * This implementation is currently SunOS 4.X and IRIX 5.X specific, though we
! 1396: * tried to use portable code where easily possible. It is known
! 1397: * not to work under a number of other systems.
! 1398: */
! 1399:
! 1400: # ifndef MSWIN32
! 1401:
! 1402: # include <sys/mman.h>
! 1403: # include <signal.h>
! 1404: # include <sys/syscall.h>
! 1405:
! 1406: # define PROTECT(addr, len) \
! 1407: if (mprotect((caddr_t)(addr), (int)(len), \
! 1408: PROT_READ | OPT_PROT_EXEC) < 0) { \
! 1409: ABORT("mprotect failed"); \
! 1410: }
! 1411: # define UNPROTECT(addr, len) \
! 1412: if (mprotect((caddr_t)(addr), (int)(len), \
! 1413: PROT_WRITE | PROT_READ | OPT_PROT_EXEC ) < 0) { \
! 1414: ABORT("un-mprotect failed"); \
! 1415: }
! 1416:
! 1417: # else
! 1418:
! 1419: # include <signal.h>
! 1420:
! 1421: static DWORD protect_junk;
! 1422: # define PROTECT(addr, len) \
! 1423: if (!VirtualProtect((addr), (len), PAGE_EXECUTE_READ, \
! 1424: &protect_junk)) { \
! 1425: DWORD last_error = GetLastError(); \
! 1426: GC_printf1("Last error code: %lx\n", last_error); \
! 1427: ABORT("VirtualProtect failed"); \
! 1428: }
! 1429: # define UNPROTECT(addr, len) \
! 1430: if (!VirtualProtect((addr), (len), PAGE_EXECUTE_READWRITE, \
! 1431: &protect_junk)) { \
! 1432: ABORT("un-VirtualProtect failed"); \
! 1433: }
! 1434:
! 1435: # endif
! 1436:
! 1437: #if defined(SUNOS4) || defined(FREEBSD)
! 1438: typedef void (* SIG_PF)();
! 1439: #endif
! 1440: #if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX)
! 1441: typedef void (* SIG_PF)(int);
! 1442: #endif
! 1443: #if defined(MSWIN32)
! 1444: typedef LPTOP_LEVEL_EXCEPTION_FILTER SIG_PF;
! 1445: # undef SIG_DFL
! 1446: # define SIG_DFL (LPTOP_LEVEL_EXCEPTION_FILTER) (-1)
! 1447: #endif
! 1448:
! 1449: #if defined(IRIX5) || defined(OSF1)
! 1450: typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *);
! 1451: #endif
! 1452: #if defined(SUNOS5SIGS)
! 1453: typedef void (* REAL_SIG_PF)(int, struct siginfo *, void *);
! 1454: #endif
! 1455: #if defined(LINUX)
! 1456: # include <linux/version.h>
! 1457: # if (LINUX_VERSION_CODE >= 0x20100) && !defined(M68K) || defined(ALPHA)
! 1458: typedef struct sigcontext s_c;
! 1459: # else
! 1460: typedef struct sigcontext_struct s_c;
! 1461: # endif
! 1462: # ifdef ALPHA
! 1463: typedef void (* REAL_SIG_PF)(int, int, s_c *);
! 1464: /* Retrieve fault address from sigcontext structure by decoding */
! 1465: /* instruction. */
! 1466: char * get_fault_addr(s_c *sc) {
! 1467: unsigned instr;
! 1468: word faultaddr;
! 1469:
! 1470: instr = *((unsigned *)(sc->sc_pc));
! 1471: faultaddr = sc->sc_regs[(instr >> 16) & 0x1f];
! 1472: faultaddr += (word) (((int)instr << 16) >> 16);
! 1473: return (char *)faultaddr;
! 1474: }
! 1475: # else /* !ALPHA */
! 1476: typedef void (* REAL_SIG_PF)(int, s_c);
! 1477: # endif /* !ALPHA */
! 1478: # endif
! 1479:
! 1480: SIG_PF GC_old_bus_handler;
! 1481: SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */
! 1482:
! 1483: /*ARGSUSED*/
! 1484: # if defined (SUNOS4) || defined(FREEBSD)
! 1485: void GC_write_fault_handler(sig, code, scp, addr)
! 1486: int sig, code;
! 1487: struct sigcontext *scp;
! 1488: char * addr;
! 1489: # ifdef SUNOS4
! 1490: # define SIG_OK (sig == SIGSEGV || sig == SIGBUS)
! 1491: # define CODE_OK (FC_CODE(code) == FC_PROT \
! 1492: || (FC_CODE(code) == FC_OBJERR \
! 1493: && FC_ERRNO(code) == FC_PROT))
! 1494: # endif
! 1495: # ifdef FREEBSD
! 1496: # define SIG_OK (sig == SIGBUS)
! 1497: # define CODE_OK (code == BUS_PAGE_FAULT)
! 1498: # endif
! 1499: # endif
! 1500: # if defined(IRIX5) || defined(OSF1)
! 1501: # include <errno.h>
! 1502: void GC_write_fault_handler(int sig, int code, struct sigcontext *scp)
! 1503: # define SIG_OK (sig == SIGSEGV)
! 1504: # ifdef OSF1
! 1505: # define CODE_OK (code == 2 /* experimentally determined */)
! 1506: # endif
! 1507: # ifdef IRIX5
! 1508: # define CODE_OK (code == EACCES)
! 1509: # endif
! 1510: # endif
! 1511: # if defined(LINUX)
! 1512: # ifdef ALPHA
! 1513: void GC_write_fault_handler(int sig, int code, s_c * sc)
! 1514: # else
! 1515: void GC_write_fault_handler(int sig, s_c sc)
! 1516: # endif
! 1517: # define SIG_OK (sig == SIGSEGV)
! 1518: # define CODE_OK TRUE
! 1519: /* Empirically c.trapno == 14, but is that useful? */
! 1520: /* We assume Intel architecture, so alignment */
! 1521: /* faults are not possible. */
! 1522: # endif
! 1523: # if defined(SUNOS5SIGS)
! 1524: void GC_write_fault_handler(int sig, struct siginfo *scp, void * context)
! 1525: # define SIG_OK (sig == SIGSEGV)
! 1526: # define CODE_OK (scp -> si_code == SEGV_ACCERR)
! 1527: # endif
! 1528: # if defined(MSWIN32)
! 1529: LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info)
! 1530: # define SIG_OK (exc_info -> ExceptionRecord -> ExceptionCode == \
! 1531: EXCEPTION_ACCESS_VIOLATION)
! 1532: # define CODE_OK (exc_info -> ExceptionRecord -> ExceptionInformation[0] == 1)
! 1533: /* Write fault */
! 1534: # endif
! 1535: {
! 1536: register unsigned i;
! 1537: # ifdef IRIX5
! 1538: char * addr = (char *) (size_t) (scp -> sc_badvaddr);
! 1539: # endif
! 1540: # if defined(OSF1) && defined(ALPHA)
! 1541: char * addr = (char *) (scp -> sc_traparg_a0);
! 1542: # endif
! 1543: # ifdef SUNOS5SIGS
! 1544: char * addr = (char *) (scp -> si_addr);
! 1545: # endif
! 1546: # ifdef LINUX
! 1547: # ifdef I386
! 1548: char * addr = (char *) (sc.cr2);
! 1549: # else
! 1550: # if defined(M68K)
! 1551: char * addr = NULL;
! 1552:
! 1553: struct sigcontext *scp = (struct sigcontext *)(&sc);
! 1554:
! 1555: int format = (scp->sc_formatvec >> 12) & 0xf;
! 1556: unsigned long *framedata = (unsigned long *)(scp + 1);
! 1557: unsigned long ea;
! 1558:
! 1559: if (format == 0xa || format == 0xb) {
! 1560: /* 68020/030 */
! 1561: ea = framedata[2];
! 1562: } else if (format == 7) {
! 1563: /* 68040 */
! 1564: ea = framedata[3];
! 1565: } else if (format == 4) {
! 1566: /* 68060 */
! 1567: ea = framedata[0];
! 1568: if (framedata[1] & 0x08000000) {
! 1569: /* correct addr on misaligned access */
! 1570: ea = (ea+4095)&(~4095);
! 1571: }
! 1572: }
! 1573: addr = (char *)ea;
! 1574: # else
! 1575: # ifdef ALPHA
! 1576: char * addr = get_fault_addr(sc);
! 1577: # else
! 1578: --> architecture not supported
! 1579: # endif
! 1580: # endif
! 1581: # endif
! 1582: # endif
! 1583: # if defined(MSWIN32)
! 1584: char * addr = (char *) (exc_info -> ExceptionRecord
! 1585: -> ExceptionInformation[1]);
! 1586: # define sig SIGSEGV
! 1587: # endif
! 1588:
! 1589: if (SIG_OK && CODE_OK) {
! 1590: register struct hblk * h =
! 1591: (struct hblk *)((word)addr & ~(GC_page_size-1));
! 1592: GC_bool in_allocd_block;
! 1593:
! 1594: # ifdef SUNOS5SIGS
! 1595: /* Address is only within the correct physical page. */
! 1596: in_allocd_block = FALSE;
! 1597: for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
! 1598: if (HDR(h+i) != 0) {
! 1599: in_allocd_block = TRUE;
! 1600: }
! 1601: }
! 1602: # else
! 1603: in_allocd_block = (HDR(addr) != 0);
! 1604: # endif
! 1605: if (!in_allocd_block) {
! 1606: /* Heap blocks now begin and end on page boundaries */
! 1607: SIG_PF old_handler;
! 1608:
! 1609: if (sig == SIGSEGV) {
! 1610: old_handler = GC_old_segv_handler;
! 1611: } else {
! 1612: old_handler = GC_old_bus_handler;
! 1613: }
! 1614: if (old_handler == SIG_DFL) {
! 1615: # ifndef MSWIN32
! 1616: GC_err_printf1("Segfault at 0x%lx\n", addr);
! 1617: ABORT("Unexpected bus error or segmentation fault");
! 1618: # else
! 1619: return(EXCEPTION_CONTINUE_SEARCH);
! 1620: # endif
! 1621: } else {
! 1622: # if defined (SUNOS4) || defined(FREEBSD)
! 1623: (*old_handler) (sig, code, scp, addr);
! 1624: return;
! 1625: # endif
! 1626: # if defined (SUNOS5SIGS)
! 1627: (*(REAL_SIG_PF)old_handler) (sig, scp, context);
! 1628: return;
! 1629: # endif
! 1630: # if defined (LINUX)
! 1631: # ifdef ALPHA
! 1632: (*(REAL_SIG_PF)old_handler) (sig, code, sc);
! 1633: # else
! 1634: (*(REAL_SIG_PF)old_handler) (sig, sc);
! 1635: # endif
! 1636: return;
! 1637: # endif
! 1638: # if defined (IRIX5) || defined(OSF1)
! 1639: (*(REAL_SIG_PF)old_handler) (sig, code, scp);
! 1640: return;
! 1641: # endif
! 1642: # ifdef MSWIN32
! 1643: return((*old_handler)(exc_info));
! 1644: # endif
! 1645: }
! 1646: }
! 1647: for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
! 1648: register int index = PHT_HASH(h+i);
! 1649:
! 1650: set_pht_entry_from_index(GC_dirty_pages, index);
! 1651: }
! 1652: UNPROTECT(h, GC_page_size);
! 1653: # if defined(OSF1) || defined(LINUX)
! 1654: /* These reset the signal handler each time by default. */
! 1655: signal(SIGSEGV, (SIG_PF) GC_write_fault_handler);
! 1656: # endif
! 1657: /* The write may not take place before dirty bits are read. */
! 1658: /* But then we'll fault again ... */
! 1659: # ifdef MSWIN32
! 1660: return(EXCEPTION_CONTINUE_EXECUTION);
! 1661: # else
! 1662: return;
! 1663: # endif
! 1664: }
! 1665: #ifdef MSWIN32
! 1666: return EXCEPTION_CONTINUE_SEARCH;
! 1667: #else
! 1668: GC_err_printf1("Segfault at 0x%lx\n", addr);
! 1669: ABORT("Unexpected bus error or segmentation fault");
! 1670: #endif
! 1671: }
! 1672:
! 1673: /*
! 1674: * We hold the allocation lock. We expect block h to be written
! 1675: * shortly.
! 1676: */
! 1677: void GC_write_hint(h)
! 1678: struct hblk *h;
! 1679: {
! 1680: register struct hblk * h_trunc;
! 1681: register unsigned i;
! 1682: register GC_bool found_clean;
! 1683:
! 1684: if (!GC_dirty_maintained) return;
! 1685: h_trunc = (struct hblk *)((word)h & ~(GC_page_size-1));
! 1686: found_clean = FALSE;
! 1687: for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
! 1688: register int index = PHT_HASH(h_trunc+i);
! 1689:
! 1690: if (!get_pht_entry_from_index(GC_dirty_pages, index)) {
! 1691: found_clean = TRUE;
! 1692: set_pht_entry_from_index(GC_dirty_pages, index);
! 1693: }
! 1694: }
! 1695: if (found_clean) {
! 1696: UNPROTECT(h_trunc, GC_page_size);
! 1697: }
! 1698: }
! 1699:
! 1700: void GC_dirty_init()
! 1701: {
! 1702: #if defined(SUNOS5SIGS) || defined(IRIX5)
! 1703: struct sigaction act, oldact;
! 1704: # ifdef IRIX5
! 1705: act.sa_flags = SA_RESTART;
! 1706: act.sa_handler = GC_write_fault_handler;
! 1707: # else
! 1708: act.sa_flags = SA_RESTART | SA_SIGINFO;
! 1709: act.sa_sigaction = GC_write_fault_handler;
! 1710: # endif
! 1711: (void)sigemptyset(&act.sa_mask);
! 1712: #endif
! 1713: # ifdef PRINTSTATS
! 1714: GC_printf0("Inititalizing mprotect virtual dirty bit implementation\n");
! 1715: # endif
! 1716: GC_dirty_maintained = TRUE;
! 1717: if (GC_page_size % HBLKSIZE != 0) {
! 1718: GC_err_printf0("Page size not multiple of HBLKSIZE\n");
! 1719: ABORT("Page size not multiple of HBLKSIZE");
! 1720: }
! 1721: # if defined(SUNOS4) || defined(FREEBSD)
! 1722: GC_old_bus_handler = signal(SIGBUS, GC_write_fault_handler);
! 1723: if (GC_old_bus_handler == SIG_IGN) {
! 1724: GC_err_printf0("Previously ignored bus error!?");
! 1725: GC_old_bus_handler = SIG_DFL;
! 1726: }
! 1727: if (GC_old_bus_handler != SIG_DFL) {
! 1728: # ifdef PRINTSTATS
! 1729: GC_err_printf0("Replaced other SIGBUS handler\n");
! 1730: # endif
! 1731: }
! 1732: # endif
! 1733: # if defined(OSF1) || defined(SUNOS4) || defined(LINUX)
! 1734: GC_old_segv_handler = signal(SIGSEGV, (SIG_PF)GC_write_fault_handler);
! 1735: if (GC_old_segv_handler == SIG_IGN) {
! 1736: GC_err_printf0("Previously ignored segmentation violation!?");
! 1737: GC_old_segv_handler = SIG_DFL;
! 1738: }
! 1739: if (GC_old_segv_handler != SIG_DFL) {
! 1740: # ifdef PRINTSTATS
! 1741: GC_err_printf0("Replaced other SIGSEGV handler\n");
! 1742: # endif
! 1743: }
! 1744: # endif
! 1745: # if defined(SUNOS5SIGS) || defined(IRIX5)
! 1746: # if defined(IRIX_THREADS) || defined(IRIX_PCR_THREADS)
! 1747: sigaction(SIGSEGV, 0, &oldact);
! 1748: sigaction(SIGSEGV, &act, 0);
! 1749: # else
! 1750: sigaction(SIGSEGV, &act, &oldact);
! 1751: # endif
! 1752: # if defined(_sigargs)
! 1753: /* This is Irix 5.x, not 6.x. Irix 5.x does not have */
! 1754: /* sa_sigaction. */
! 1755: GC_old_segv_handler = oldact.sa_handler;
! 1756: # else /* Irix 6.x or SUNOS5SIGS */
! 1757: if (oldact.sa_flags & SA_SIGINFO) {
! 1758: GC_old_segv_handler = (SIG_PF)(oldact.sa_sigaction);
! 1759: } else {
! 1760: GC_old_segv_handler = oldact.sa_handler;
! 1761: }
! 1762: # endif
! 1763: if (GC_old_segv_handler == SIG_IGN) {
! 1764: GC_err_printf0("Previously ignored segmentation violation!?");
! 1765: GC_old_segv_handler = SIG_DFL;
! 1766: }
! 1767: if (GC_old_segv_handler != SIG_DFL) {
! 1768: # ifdef PRINTSTATS
! 1769: GC_err_printf0("Replaced other SIGSEGV handler\n");
! 1770: # endif
! 1771: }
! 1772: # endif
! 1773: # if defined(MSWIN32)
! 1774: GC_old_segv_handler = SetUnhandledExceptionFilter(GC_write_fault_handler);
! 1775: if (GC_old_segv_handler != NULL) {
! 1776: # ifdef PRINTSTATS
! 1777: GC_err_printf0("Replaced other UnhandledExceptionFilter\n");
! 1778: # endif
! 1779: } else {
! 1780: GC_old_segv_handler = SIG_DFL;
! 1781: }
! 1782: # endif
! 1783: }
! 1784:
! 1785:
! 1786:
! 1787: void GC_protect_heap()
! 1788: {
! 1789: ptr_t start;
! 1790: word len;
! 1791: unsigned i;
! 1792:
! 1793: for (i = 0; i < GC_n_heap_sects; i++) {
! 1794: start = GC_heap_sects[i].hs_start;
! 1795: len = GC_heap_sects[i].hs_bytes;
! 1796: PROTECT(start, len);
! 1797: }
! 1798: }
! 1799:
! 1800: /* We assume that either the world is stopped or its OK to lose dirty */
! 1801: /* bits while this is happenning (as in GC_enable_incremental). */
! 1802: void GC_read_dirty()
! 1803: {
! 1804: BCOPY((word *)GC_dirty_pages, GC_grungy_pages,
! 1805: (sizeof GC_dirty_pages));
! 1806: BZERO((word *)GC_dirty_pages, (sizeof GC_dirty_pages));
! 1807: GC_protect_heap();
! 1808: }
! 1809:
! 1810: GC_bool GC_page_was_dirty(h)
! 1811: struct hblk * h;
! 1812: {
! 1813: register word index = PHT_HASH(h);
! 1814:
! 1815: return(HDR(h) == 0 || get_pht_entry_from_index(GC_grungy_pages, index));
! 1816: }
! 1817:
! 1818: /*
! 1819: * Acquiring the allocation lock here is dangerous, since this
! 1820: * can be called from within GC_call_with_alloc_lock, and the cord
! 1821: * package does so. On systems that allow nested lock acquisition, this
! 1822: * happens to work.
! 1823: * On other systems, SET_LOCK_HOLDER and friends must be suitably defined.
! 1824: */
! 1825:
! 1826: void GC_begin_syscall()
! 1827: {
! 1828: if (!I_HOLD_LOCK()) LOCK();
! 1829: }
! 1830:
! 1831: void GC_end_syscall()
! 1832: {
! 1833: if (!I_HOLD_LOCK()) UNLOCK();
! 1834: }
! 1835:
! 1836: void GC_unprotect_range(addr, len)
! 1837: ptr_t addr;
! 1838: word len;
! 1839: {
! 1840: struct hblk * start_block;
! 1841: struct hblk * end_block;
! 1842: register struct hblk *h;
! 1843: ptr_t obj_start;
! 1844:
! 1845: if (!GC_incremental) return;
! 1846: obj_start = GC_base(addr);
! 1847: if (obj_start == 0) return;
! 1848: if (GC_base(addr + len - 1) != obj_start) {
! 1849: ABORT("GC_unprotect_range(range bigger than object)");
! 1850: }
! 1851: start_block = (struct hblk *)((word)addr & ~(GC_page_size - 1));
! 1852: end_block = (struct hblk *)((word)(addr + len - 1) & ~(GC_page_size - 1));
! 1853: end_block += GC_page_size/HBLKSIZE - 1;
! 1854: for (h = start_block; h <= end_block; h++) {
! 1855: register word index = PHT_HASH(h);
! 1856:
! 1857: set_pht_entry_from_index(GC_dirty_pages, index);
! 1858: }
! 1859: UNPROTECT(start_block,
! 1860: ((ptr_t)end_block - (ptr_t)start_block) + HBLKSIZE);
! 1861: }
! 1862:
! 1863: #ifndef MSWIN32
! 1864: /* Replacement for UNIX system call. */
! 1865: /* Other calls that write to the heap */
! 1866: /* should be handled similarly. */
! 1867: # if defined(__STDC__) && !defined(SUNOS4)
! 1868: # include <unistd.h>
! 1869: ssize_t read(int fd, void *buf, size_t nbyte)
! 1870: # else
! 1871: # ifndef LINT
! 1872: int read(fd, buf, nbyte)
! 1873: # else
! 1874: int GC_read(fd, buf, nbyte)
! 1875: # endif
! 1876: int fd;
! 1877: char *buf;
! 1878: int nbyte;
! 1879: # endif
! 1880: {
! 1881: int result;
! 1882:
! 1883: GC_begin_syscall();
! 1884: GC_unprotect_range(buf, (word)nbyte);
! 1885: # ifdef IRIX5
! 1886: /* Indirect system call may not always be easily available. */
! 1887: /* We could call _read, but that would interfere with the */
! 1888: /* libpthread interception of read. */
! 1889: {
! 1890: struct iovec iov;
! 1891:
! 1892: iov.iov_base = buf;
! 1893: iov.iov_len = nbyte;
! 1894: result = readv(fd, &iov, 1);
! 1895: }
! 1896: # else
! 1897: result = syscall(SYS_read, fd, buf, nbyte);
! 1898: # endif
! 1899: GC_end_syscall();
! 1900: return(result);
! 1901: }
! 1902: #endif /* !MSWIN32 */
! 1903:
! 1904: /*ARGSUSED*/
! 1905: GC_bool GC_page_was_ever_dirty(h)
! 1906: struct hblk *h;
! 1907: {
! 1908: return(TRUE);
! 1909: }
! 1910:
! 1911: /* Reset the n pages starting at h to "was never dirty" status. */
! 1912: /*ARGSUSED*/
! 1913: void GC_is_fresh(h, n)
! 1914: struct hblk *h;
! 1915: word n;
! 1916: {
! 1917: }
! 1918:
! 1919: # endif /* MPROTECT_VDB */
! 1920:
! 1921: # ifdef PROC_VDB
! 1922:
! 1923: /*
! 1924: * See DEFAULT_VDB for interface descriptions.
! 1925: */
! 1926:
! 1927: /*
! 1928: * This implementaion assumes a Solaris 2.X like /proc pseudo-file-system
! 1929: * from which we can read page modified bits. This facility is far from
! 1930: * optimal (e.g. we would like to get the info for only some of the
! 1931: * address space), but it avoids intercepting system calls.
! 1932: */
! 1933:
! 1934: #include <errno.h>
! 1935: #include <sys/types.h>
! 1936: #include <sys/signal.h>
! 1937: #include <sys/fault.h>
! 1938: #include <sys/syscall.h>
! 1939: #include <sys/procfs.h>
! 1940: #include <sys/stat.h>
! 1941: #include <fcntl.h>
! 1942:
! 1943: #define INITIAL_BUF_SZ 4096
! 1944: word GC_proc_buf_size = INITIAL_BUF_SZ;
! 1945: char *GC_proc_buf;
! 1946:
! 1947: #ifdef SOLARIS_THREADS
! 1948: /* We don't have exact sp values for threads. So we count on */
! 1949: /* occasionally declaring stack pages to be fresh. Thus we */
! 1950: /* need a real implementation of GC_is_fresh. We can't clear */
! 1951: /* entries in GC_written_pages, since that would declare all */
! 1952: /* pages with the given hash address to be fresh. */
! 1953: # define MAX_FRESH_PAGES 8*1024 /* Must be power of 2 */
! 1954: struct hblk ** GC_fresh_pages; /* A direct mapped cache. */
! 1955: /* Collisions are dropped. */
! 1956:
! 1957: # define FRESH_PAGE_SLOT(h) (divHBLKSZ((word)(h)) & (MAX_FRESH_PAGES-1))
! 1958: # define ADD_FRESH_PAGE(h) \
! 1959: GC_fresh_pages[FRESH_PAGE_SLOT(h)] = (h)
! 1960: # define PAGE_IS_FRESH(h) \
! 1961: (GC_fresh_pages[FRESH_PAGE_SLOT(h)] == (h) && (h) != 0)
! 1962: #endif
! 1963:
! 1964: /* Add all pages in pht2 to pht1 */
! 1965: void GC_or_pages(pht1, pht2)
! 1966: page_hash_table pht1, pht2;
! 1967: {
! 1968: register int i;
! 1969:
! 1970: for (i = 0; i < PHT_SIZE; i++) pht1[i] |= pht2[i];
! 1971: }
! 1972:
! 1973: int GC_proc_fd;
! 1974:
! 1975: void GC_dirty_init()
! 1976: {
! 1977: int fd;
! 1978: char buf[30];
! 1979:
! 1980: GC_dirty_maintained = TRUE;
! 1981: if (GC_words_allocd != 0 || GC_words_allocd_before_gc != 0) {
! 1982: register int i;
! 1983:
! 1984: for (i = 0; i < PHT_SIZE; i++) GC_written_pages[i] = (word)(-1);
! 1985: # ifdef PRINTSTATS
! 1986: GC_printf1("Allocated words:%lu:all pages may have been written\n",
! 1987: (unsigned long)
! 1988: (GC_words_allocd + GC_words_allocd_before_gc));
! 1989: # endif
! 1990: }
! 1991: sprintf(buf, "/proc/%d", getpid());
! 1992: fd = open(buf, O_RDONLY);
! 1993: if (fd < 0) {
! 1994: ABORT("/proc open failed");
! 1995: }
! 1996: GC_proc_fd = syscall(SYS_ioctl, fd, PIOCOPENPD, 0);
! 1997: close(fd);
! 1998: if (GC_proc_fd < 0) {
! 1999: ABORT("/proc ioctl failed");
! 2000: }
! 2001: GC_proc_buf = GC_scratch_alloc(GC_proc_buf_size);
! 2002: # ifdef SOLARIS_THREADS
! 2003: GC_fresh_pages = (struct hblk **)
! 2004: GC_scratch_alloc(MAX_FRESH_PAGES * sizeof (struct hblk *));
! 2005: if (GC_fresh_pages == 0) {
! 2006: GC_err_printf0("No space for fresh pages\n");
! 2007: EXIT();
! 2008: }
! 2009: BZERO(GC_fresh_pages, MAX_FRESH_PAGES * sizeof (struct hblk *));
! 2010: # endif
! 2011: }
! 2012:
! 2013: /* Ignore write hints. They don't help us here. */
! 2014: /*ARGSUSED*/
! 2015: void GC_write_hint(h)
! 2016: struct hblk *h;
! 2017: {
! 2018: }
! 2019:
! 2020: #ifdef SOLARIS_THREADS
! 2021: # define READ(fd,buf,nbytes) syscall(SYS_read, fd, buf, nbytes)
! 2022: #else
! 2023: # define READ(fd,buf,nbytes) read(fd, buf, nbytes)
! 2024: #endif
! 2025:
! 2026: void GC_read_dirty()
! 2027: {
! 2028: unsigned long ps, np;
! 2029: int nmaps;
! 2030: ptr_t vaddr;
! 2031: struct prasmap * map;
! 2032: char * bufp;
! 2033: ptr_t current_addr, limit;
! 2034: int i;
! 2035: int dummy;
! 2036:
! 2037: BZERO(GC_grungy_pages, (sizeof GC_grungy_pages));
! 2038:
! 2039: bufp = GC_proc_buf;
! 2040: if (READ(GC_proc_fd, bufp, GC_proc_buf_size) <= 0) {
! 2041: # ifdef PRINTSTATS
! 2042: GC_printf1("/proc read failed: GC_proc_buf_size = %lu\n",
! 2043: GC_proc_buf_size);
! 2044: # endif
! 2045: {
! 2046: /* Retry with larger buffer. */
! 2047: word new_size = 2 * GC_proc_buf_size;
! 2048: char * new_buf = GC_scratch_alloc(new_size);
! 2049:
! 2050: if (new_buf != 0) {
! 2051: GC_proc_buf = bufp = new_buf;
! 2052: GC_proc_buf_size = new_size;
! 2053: }
! 2054: if (syscall(SYS_read, GC_proc_fd, bufp, GC_proc_buf_size) <= 0) {
! 2055: WARN("Insufficient space for /proc read\n", 0);
! 2056: /* Punt: */
! 2057: memset(GC_grungy_pages, 0xff, sizeof (page_hash_table));
! 2058: memset(GC_written_pages, 0xff, sizeof(page_hash_table));
! 2059: # ifdef SOLARIS_THREADS
! 2060: BZERO(GC_fresh_pages,
! 2061: MAX_FRESH_PAGES * sizeof (struct hblk *));
! 2062: # endif
! 2063: return;
! 2064: }
! 2065: }
! 2066: }
! 2067: /* Copy dirty bits into GC_grungy_pages */
! 2068: nmaps = ((struct prpageheader *)bufp) -> pr_nmap;
! 2069: /* printf( "nmaps = %d, PG_REFERENCED = %d, PG_MODIFIED = %d\n",
! 2070: nmaps, PG_REFERENCED, PG_MODIFIED); */
! 2071: bufp = bufp + sizeof(struct prpageheader);
! 2072: for (i = 0; i < nmaps; i++) {
! 2073: map = (struct prasmap *)bufp;
! 2074: vaddr = (ptr_t)(map -> pr_vaddr);
! 2075: ps = map -> pr_pagesize;
! 2076: np = map -> pr_npage;
! 2077: /* printf("vaddr = 0x%X, ps = 0x%X, np = 0x%X\n", vaddr, ps, np); */
! 2078: limit = vaddr + ps * np;
! 2079: bufp += sizeof (struct prasmap);
! 2080: for (current_addr = vaddr;
! 2081: current_addr < limit; current_addr += ps){
! 2082: if ((*bufp++) & PG_MODIFIED) {
! 2083: register struct hblk * h = (struct hblk *) current_addr;
! 2084:
! 2085: while ((ptr_t)h < current_addr + ps) {
! 2086: register word index = PHT_HASH(h);
! 2087:
! 2088: set_pht_entry_from_index(GC_grungy_pages, index);
! 2089: # ifdef SOLARIS_THREADS
! 2090: {
! 2091: register int slot = FRESH_PAGE_SLOT(h);
! 2092:
! 2093: if (GC_fresh_pages[slot] == h) {
! 2094: GC_fresh_pages[slot] = 0;
! 2095: }
! 2096: }
! 2097: # endif
! 2098: h++;
! 2099: }
! 2100: }
! 2101: }
! 2102: bufp += sizeof(long) - 1;
! 2103: bufp = (char *)((unsigned long)bufp & ~(sizeof(long)-1));
! 2104: }
! 2105: /* Update GC_written_pages. */
! 2106: GC_or_pages(GC_written_pages, GC_grungy_pages);
! 2107: # ifdef SOLARIS_THREADS
! 2108: /* Make sure that old stacks are considered completely clean */
! 2109: /* unless written again. */
! 2110: GC_old_stacks_are_fresh();
! 2111: # endif
! 2112: }
! 2113:
! 2114: #undef READ
! 2115:
! 2116: GC_bool GC_page_was_dirty(h)
! 2117: struct hblk *h;
! 2118: {
! 2119: register word index = PHT_HASH(h);
! 2120: register GC_bool result;
! 2121:
! 2122: result = get_pht_entry_from_index(GC_grungy_pages, index);
! 2123: # ifdef SOLARIS_THREADS
! 2124: if (result && PAGE_IS_FRESH(h)) result = FALSE;
! 2125: /* This happens only if page was declared fresh since */
! 2126: /* the read_dirty call, e.g. because it's in an unused */
! 2127: /* thread stack. It's OK to treat it as clean, in */
! 2128: /* that case. And it's consistent with */
! 2129: /* GC_page_was_ever_dirty. */
! 2130: # endif
! 2131: return(result);
! 2132: }
! 2133:
! 2134: GC_bool GC_page_was_ever_dirty(h)
! 2135: struct hblk *h;
! 2136: {
! 2137: register word index = PHT_HASH(h);
! 2138: register GC_bool result;
! 2139:
! 2140: result = get_pht_entry_from_index(GC_written_pages, index);
! 2141: # ifdef SOLARIS_THREADS
! 2142: if (result && PAGE_IS_FRESH(h)) result = FALSE;
! 2143: # endif
! 2144: return(result);
! 2145: }
! 2146:
! 2147: /* Caller holds allocation lock. */
! 2148: void GC_is_fresh(h, n)
! 2149: struct hblk *h;
! 2150: word n;
! 2151: {
! 2152:
! 2153: register word index;
! 2154:
! 2155: # ifdef SOLARIS_THREADS
! 2156: register word i;
! 2157:
! 2158: if (GC_fresh_pages != 0) {
! 2159: for (i = 0; i < n; i++) {
! 2160: ADD_FRESH_PAGE(h + i);
! 2161: }
! 2162: }
! 2163: # endif
! 2164: }
! 2165:
! 2166: # endif /* PROC_VDB */
! 2167:
! 2168:
! 2169: # ifdef PCR_VDB
! 2170:
! 2171: # include "vd/PCR_VD.h"
! 2172:
! 2173: # define NPAGES (32*1024) /* 128 MB */
! 2174:
! 2175: PCR_VD_DB GC_grungy_bits[NPAGES];
! 2176:
! 2177: ptr_t GC_vd_base; /* Address corresponding to GC_grungy_bits[0] */
! 2178: /* HBLKSIZE aligned. */
! 2179:
! 2180: void GC_dirty_init()
! 2181: {
! 2182: GC_dirty_maintained = TRUE;
! 2183: /* For the time being, we assume the heap generally grows up */
! 2184: GC_vd_base = GC_heap_sects[0].hs_start;
! 2185: if (GC_vd_base == 0) {
! 2186: ABORT("Bad initial heap segment");
! 2187: }
! 2188: if (PCR_VD_Start(HBLKSIZE, GC_vd_base, NPAGES*HBLKSIZE)
! 2189: != PCR_ERes_okay) {
! 2190: ABORT("dirty bit initialization failed");
! 2191: }
! 2192: }
! 2193:
! 2194: void GC_read_dirty()
! 2195: {
! 2196: /* lazily enable dirty bits on newly added heap sects */
! 2197: {
! 2198: static int onhs = 0;
! 2199: int nhs = GC_n_heap_sects;
! 2200: for( ; onhs < nhs; onhs++ ) {
! 2201: PCR_VD_WriteProtectEnable(
! 2202: GC_heap_sects[onhs].hs_start,
! 2203: GC_heap_sects[onhs].hs_bytes );
! 2204: }
! 2205: }
! 2206:
! 2207:
! 2208: if (PCR_VD_Clear(GC_vd_base, NPAGES*HBLKSIZE, GC_grungy_bits)
! 2209: != PCR_ERes_okay) {
! 2210: ABORT("dirty bit read failed");
! 2211: }
! 2212: }
! 2213:
! 2214: GC_bool GC_page_was_dirty(h)
! 2215: struct hblk *h;
! 2216: {
! 2217: if((ptr_t)h < GC_vd_base || (ptr_t)h >= GC_vd_base + NPAGES*HBLKSIZE) {
! 2218: return(TRUE);
! 2219: }
! 2220: return(GC_grungy_bits[h - (struct hblk *)GC_vd_base] & PCR_VD_DB_dirtyBit);
! 2221: }
! 2222:
! 2223: /*ARGSUSED*/
! 2224: void GC_write_hint(h)
! 2225: struct hblk *h;
! 2226: {
! 2227: PCR_VD_WriteProtectDisable(h, HBLKSIZE);
! 2228: PCR_VD_WriteProtectEnable(h, HBLKSIZE);
! 2229: }
! 2230:
! 2231: # endif /* PCR_VDB */
! 2232:
! 2233: /*
! 2234: * Call stack save code for debugging.
! 2235: * Should probably be in mach_dep.c, but that requires reorganization.
! 2236: */
! 2237: #if defined(SPARC) && !defined(LINUX)
! 2238: # if defined(SUNOS4)
! 2239: # include <machine/frame.h>
! 2240: # else
! 2241: # if defined (DRSNX)
! 2242: # include <sys/sparc/frame.h>
! 2243: # else
! 2244: # include <sys/frame.h>
! 2245: # endif
! 2246: # endif
! 2247: # if NARGS > 6
! 2248: --> We only know how to to get the first 6 arguments
! 2249: # endif
! 2250:
! 2251: #ifdef SAVE_CALL_CHAIN
! 2252: /* Fill in the pc and argument information for up to NFRAMES of my */
! 2253: /* callers. Ignore my frame and my callers frame. */
! 2254: void GC_save_callers (info)
! 2255: struct callinfo info[NFRAMES];
! 2256: {
! 2257: struct frame *frame;
! 2258: struct frame *fp;
! 2259: int nframes = 0;
! 2260: word GC_save_regs_in_stack();
! 2261:
! 2262: frame = (struct frame *) GC_save_regs_in_stack ();
! 2263:
! 2264: for (fp = frame -> fr_savfp; fp != 0 && nframes < NFRAMES;
! 2265: fp = fp -> fr_savfp, nframes++) {
! 2266: register int i;
! 2267:
! 2268: info[nframes].ci_pc = fp->fr_savpc;
! 2269: for (i = 0; i < NARGS; i++) {
! 2270: info[nframes].ci_arg[i] = ~(fp->fr_arg[i]);
! 2271: }
! 2272: }
! 2273: if (nframes < NFRAMES) info[nframes].ci_pc = 0;
! 2274: }
! 2275:
! 2276: #endif /* SAVE_CALL_CHAIN */
! 2277: #endif /* SPARC */
! 2278:
! 2279:
! 2280:
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