Annotation of OpenXM_contrib2/asir2000/gc/os_dep.c, Revision 1.1
1.1 ! noro 1: int ox_usr1_sent, ox_int_received, critical_when_signal;
! 2: static int inside_critical_section;
! 3:
! 4: /*
! 5: * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
! 6: * Copyright (c) 1996-1997 by Silicon Graphics. All rights reserved.
! 7: *
! 8: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
! 9: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
! 10: *
! 11: * Permission is hereby granted to use or copy this program
! 12: * for any purpose, provided the above notices are retained on all copies.
! 13: * Permission to modify the code and to distribute modified code is granted,
! 14: * provided the above notices are retained, and a notice that the code was
! 15: * modified is included with the above copyright notice.
! 16: */
! 17:
! 18: # include "gc_priv.h"
! 19:
! 20: # if defined(LINUX) && !defined(POWERPC)
! 21: # include <linux/version.h>
! 22: # if (LINUX_VERSION_CODE <= 0x10400)
! 23: /* Ugly hack to get struct sigcontext_struct definition. Required */
! 24: /* for some early 1.3.X releases. Will hopefully go away soon. */
! 25: /* in some later Linux releases, asm/sigcontext.h may have to */
! 26: /* be included instead. */
! 27: # define __KERNEL__
! 28: # include <asm/signal.h>
! 29: # undef __KERNEL__
! 30: # else
! 31: /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
! 32: /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
! 33: /* prototypes, so we have to include the top-level sigcontext.h to */
! 34: /* make sure the former gets defined to be the latter if appropriate. */
! 35: # include <features.h>
! 36: # if 2 <= __GLIBC__
! 37: # if 0 == __GLIBC_MINOR__
! 38: /* glibc 2.1 no longer has sigcontext.h. But signal.h */
! 39: /* has the right declaration for glibc 2.1. */
! 40: # include <sigcontext.h>
! 41: # endif /* 0 == __GLIBC_MINOR__ */
! 42: # else /* not 2 <= __GLIBC__ */
! 43: /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
! 44: /* one. Check LINUX_VERSION_CODE to see which we should reference. */
! 45: # include <asm/sigcontext.h>
! 46: # endif /* 2 <= __GLIBC__ */
! 47: # endif
! 48: # endif
! 49: # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
! 50: # include <sys/types.h>
! 51: # if !defined(MSWIN32) && !defined(SUNOS4)
! 52: # include <unistd.h>
! 53: # endif
! 54: # endif
! 55:
! 56: # include <stdio.h>
! 57: # include <signal.h>
! 58:
! 59: /* Blatantly OS dependent routines, except for those that are related */
! 60: /* dynamic loading. */
! 61:
! 62: # if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
! 63: # define NEED_FIND_LIMIT
! 64: # endif
! 65:
! 66: # if defined(IRIX_THREADS)
! 67: # define NEED_FIND_LIMIT
! 68: # endif
! 69:
! 70: # if (defined(SUNOS4) & defined(DYNAMIC_LOADING)) && !defined(PCR)
! 71: # define NEED_FIND_LIMIT
! 72: # endif
! 73:
! 74: # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
! 75: # define NEED_FIND_LIMIT
! 76: # endif
! 77:
! 78: # if defined(LINUX) && (defined(POWERPC) || defined(SPARC) || defined(ALPHA))
! 79: # define NEED_FIND_LIMIT
! 80: # endif
! 81:
! 82: #ifdef NEED_FIND_LIMIT
! 83: # include <setjmp.h>
! 84: #endif
! 85:
! 86: #ifdef FREEBSD
! 87: # include <machine/trap.h>
! 88: #endif
! 89:
! 90: #ifdef AMIGA
! 91: # include <proto/exec.h>
! 92: # include <proto/dos.h>
! 93: # include <dos/dosextens.h>
! 94: # include <workbench/startup.h>
! 95: #endif
! 96:
! 97: #ifdef MSWIN32
! 98: # define WIN32_LEAN_AND_MEAN
! 99: # define NOSERVICE
! 100: # include <windows.h>
! 101: #endif
! 102:
! 103: #ifdef MACOS
! 104: # include <Processes.h>
! 105: #endif
! 106:
! 107: #ifdef IRIX5
! 108: # include <sys/uio.h>
! 109: # include <malloc.h> /* for locking */
! 110: #endif
! 111: #ifdef USE_MMAP
! 112: # include <sys/types.h>
! 113: # include <sys/mman.h>
! 114: # include <sys/stat.h>
! 115: # include <fcntl.h>
! 116: #endif
! 117:
! 118: #ifdef SUNOS5SIGS
! 119: # include <sys/siginfo.h>
! 120: # undef setjmp
! 121: # undef longjmp
! 122: # define setjmp(env) sigsetjmp(env, 1)
! 123: # define longjmp(env, val) siglongjmp(env, val)
! 124: # define jmp_buf sigjmp_buf
! 125: #endif
! 126:
! 127: #ifdef DJGPP
! 128: /* Apparently necessary for djgpp 2.01. May casuse problems with */
! 129: /* other versions. */
! 130: typedef long unsigned int caddr_t;
! 131: #endif
! 132:
! 133: #ifdef PCR
! 134: # include "il/PCR_IL.h"
! 135: # include "th/PCR_ThCtl.h"
! 136: # include "mm/PCR_MM.h"
! 137: #endif
! 138:
! 139: #if !defined(NO_EXECUTE_PERMISSION)
! 140: # define OPT_PROT_EXEC PROT_EXEC
! 141: #else
! 142: # define OPT_PROT_EXEC 0
! 143: #endif
! 144:
! 145: #if defined(LINUX) && (defined(POWERPC) || defined(SPARC) || defined(ALPHA))
! 146: /* The I386 case can be handled without a search. The Alpha case */
! 147: /* used to be handled differently as well, but the rules changed */
! 148: /* for recent Linux versions. This seems to be the easiest way to */
! 149: /* cover all versions. */
! 150: ptr_t GC_data_start;
! 151:
! 152: extern char * GC_copyright[]; /* Any data symbol would do. */
! 153:
! 154: void GC_init_linux_data_start()
! 155: {
! 156: extern ptr_t GC_find_limit();
! 157:
! 158: GC_data_start = GC_find_limit((ptr_t)GC_copyright, FALSE);
! 159: }
! 160: #endif
! 161:
! 162: # ifdef OS2
! 163:
! 164: # include <stddef.h>
! 165:
! 166: # if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
! 167:
! 168: struct exe_hdr {
! 169: unsigned short magic_number;
! 170: unsigned short padding[29];
! 171: long new_exe_offset;
! 172: };
! 173:
! 174: #define E_MAGIC(x) (x).magic_number
! 175: #define EMAGIC 0x5A4D
! 176: #define E_LFANEW(x) (x).new_exe_offset
! 177:
! 178: struct e32_exe {
! 179: unsigned char magic_number[2];
! 180: unsigned char byte_order;
! 181: unsigned char word_order;
! 182: unsigned long exe_format_level;
! 183: unsigned short cpu;
! 184: unsigned short os;
! 185: unsigned long padding1[13];
! 186: unsigned long object_table_offset;
! 187: unsigned long object_count;
! 188: unsigned long padding2[31];
! 189: };
! 190:
! 191: #define E32_MAGIC1(x) (x).magic_number[0]
! 192: #define E32MAGIC1 'L'
! 193: #define E32_MAGIC2(x) (x).magic_number[1]
! 194: #define E32MAGIC2 'X'
! 195: #define E32_BORDER(x) (x).byte_order
! 196: #define E32LEBO 0
! 197: #define E32_WORDER(x) (x).word_order
! 198: #define E32LEWO 0
! 199: #define E32_CPU(x) (x).cpu
! 200: #define E32CPU286 1
! 201: #define E32_OBJTAB(x) (x).object_table_offset
! 202: #define E32_OBJCNT(x) (x).object_count
! 203:
! 204: struct o32_obj {
! 205: unsigned long size;
! 206: unsigned long base;
! 207: unsigned long flags;
! 208: unsigned long pagemap;
! 209: unsigned long mapsize;
! 210: unsigned long reserved;
! 211: };
! 212:
! 213: #define O32_FLAGS(x) (x).flags
! 214: #define OBJREAD 0x0001L
! 215: #define OBJWRITE 0x0002L
! 216: #define OBJINVALID 0x0080L
! 217: #define O32_SIZE(x) (x).size
! 218: #define O32_BASE(x) (x).base
! 219:
! 220: # else /* IBM's compiler */
! 221:
! 222: /* A kludge to get around what appears to be a header file bug */
! 223: # ifndef WORD
! 224: # define WORD unsigned short
! 225: # endif
! 226: # ifndef DWORD
! 227: # define DWORD unsigned long
! 228: # endif
! 229:
! 230: # define EXE386 1
! 231: # include <newexe.h>
! 232: # include <exe386.h>
! 233:
! 234: # endif /* __IBMC__ */
! 235:
! 236: # define INCL_DOSEXCEPTIONS
! 237: # define INCL_DOSPROCESS
! 238: # define INCL_DOSERRORS
! 239: # define INCL_DOSMODULEMGR
! 240: # define INCL_DOSMEMMGR
! 241: # include <os2.h>
! 242:
! 243:
! 244: /* Disable and enable signals during nontrivial allocations */
! 245:
! 246: void GC_disable_signals(void)
! 247: {
! 248: ULONG nest;
! 249:
! 250: DosEnterMustComplete(&nest);
! 251: if (nest != 1) ABORT("nested GC_disable_signals");
! 252: }
! 253:
! 254: void GC_enable_signals(void)
! 255: {
! 256: ULONG nest;
! 257:
! 258: DosExitMustComplete(&nest);
! 259: if (nest != 0) ABORT("GC_enable_signals");
! 260: }
! 261:
! 262:
! 263: # else
! 264:
! 265: # if !defined(PCR) && !defined(AMIGA) && !defined(MSWIN32) \
! 266: && !defined(MACOS) && !defined(DJGPP) && !defined(DOS4GW)
! 267:
! 268: # if defined(sigmask) && !defined(UTS4)
! 269: /* Use the traditional BSD interface */
! 270: # define SIGSET_T int
! 271: # define SIG_DEL(set, signal) (set) &= ~(sigmask(signal))
! 272: # define SIG_FILL(set) (set) = 0x7fffffff
! 273: /* Setting the leading bit appears to provoke a bug in some */
! 274: /* longjmp implementations. Most systems appear not to have */
! 275: /* a signal 32. */
! 276: # define SIGSETMASK(old, new) (old) = sigsetmask(new)
! 277: # else
! 278: /* Use POSIX/SYSV interface */
! 279: # define SIGSET_T sigset_t
! 280: # define SIG_DEL(set, signal) sigdelset(&(set), (signal))
! 281: # define SIG_FILL(set) sigfillset(&set)
! 282: # define SIGSETMASK(old, new) sigprocmask(SIG_SETMASK, &(new), &(old))
! 283: # endif
! 284:
! 285: static GC_bool mask_initialized = FALSE;
! 286:
! 287: static SIGSET_T new_mask;
! 288:
! 289: static SIGSET_T old_mask;
! 290:
! 291: static SIGSET_T dummy;
! 292:
! 293: #if defined(PRINTSTATS) && !defined(THREADS)
! 294: # define CHECK_SIGNALS
! 295: int GC_sig_disabled = 0;
! 296: #endif
! 297:
! 298: void GC_disable_signals()
! 299: {
! 300: if (!mask_initialized) {
! 301: SIG_FILL(new_mask);
! 302:
! 303: SIG_DEL(new_mask, SIGSEGV);
! 304: SIG_DEL(new_mask, SIGILL);
! 305: SIG_DEL(new_mask, SIGQUIT);
! 306: # ifdef SIGBUS
! 307: SIG_DEL(new_mask, SIGBUS);
! 308: # endif
! 309: # ifdef SIGIOT
! 310: SIG_DEL(new_mask, SIGIOT);
! 311: # endif
! 312: # ifdef SIGEMT
! 313: SIG_DEL(new_mask, SIGEMT);
! 314: # endif
! 315: # ifdef SIGTRAP
! 316: SIG_DEL(new_mask, SIGTRAP);
! 317: # endif
! 318: mask_initialized = TRUE;
! 319: }
! 320: # ifdef CHECK_SIGNALS
! 321: if (GC_sig_disabled != 0) ABORT("Nested disables");
! 322: GC_sig_disabled++;
! 323: # endif
! 324: SIGSETMASK(old_mask,new_mask);
! 325: if ( critical_when_signal )
! 326: inside_critical_section = 1;
! 327: else {
! 328: inside_critical_section = 0;
! 329: critical_when_signal = 1;
! 330: }
! 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: if ( !inside_critical_section ) {
! 341: critical_when_signal = 0;
! 342: if ( ox_usr1_sent ) {
! 343: ox_usr1_sent = 0; ox_usr1_handler();
! 344: }
! 345: if ( ox_int_received ) {
! 346: ox_int_received = 0; int_handler();
! 347: }
! 348: } else
! 349: inside_critical_section = 0;
! 350: }
! 351:
! 352: # endif /* !PCR */
! 353:
! 354: # endif /*!OS/2 */
! 355:
! 356: /* Ivan Demakov: simplest way (to me) */
! 357: #ifdef DOS4GW
! 358: void GC_disable_signals() { }
! 359: void GC_enable_signals() { }
! 360: #endif
! 361:
! 362: /* Find the page size */
! 363: word GC_page_size;
! 364:
! 365: # ifdef MSWIN32
! 366: void GC_setpagesize()
! 367: {
! 368: SYSTEM_INFO sysinfo;
! 369:
! 370: GetSystemInfo(&sysinfo);
! 371: GC_page_size = sysinfo.dwPageSize;
! 372: }
! 373:
! 374: # else
! 375: # if defined(MPROTECT_VDB) || defined(PROC_VDB) || defined(USE_MMAP) \
! 376: || defined(USE_MUNMAP)
! 377: void GC_setpagesize()
! 378: {
! 379: GC_page_size = GETPAGESIZE();
! 380: }
! 381: # else
! 382: /* It's acceptable to fake it. */
! 383: void GC_setpagesize()
! 384: {
! 385: GC_page_size = HBLKSIZE;
! 386: }
! 387: # endif
! 388: # endif
! 389:
! 390: /*
! 391: * Find the base of the stack.
! 392: * Used only in single-threaded environment.
! 393: * With threads, GC_mark_roots needs to know how to do this.
! 394: * Called with allocator lock held.
! 395: */
! 396: # ifdef MSWIN32
! 397: # define is_writable(prot) ((prot) == PAGE_READWRITE \
! 398: || (prot) == PAGE_WRITECOPY \
! 399: || (prot) == PAGE_EXECUTE_READWRITE \
! 400: || (prot) == PAGE_EXECUTE_WRITECOPY)
! 401: /* Return the number of bytes that are writable starting at p. */
! 402: /* The pointer p is assumed to be page aligned. */
! 403: /* If base is not 0, *base becomes the beginning of the */
! 404: /* allocation region containing p. */
! 405: word GC_get_writable_length(ptr_t p, ptr_t *base)
! 406: {
! 407: MEMORY_BASIC_INFORMATION buf;
! 408: word result;
! 409: word protect;
! 410:
! 411: result = VirtualQuery(p, &buf, sizeof(buf));
! 412: if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
! 413: if (base != 0) *base = (ptr_t)(buf.AllocationBase);
! 414: protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
! 415: if (!is_writable(protect)) {
! 416: return(0);
! 417: }
! 418: if (buf.State != MEM_COMMIT) return(0);
! 419: return(buf.RegionSize);
! 420: }
! 421:
! 422: ptr_t GC_get_stack_base()
! 423: {
! 424: int dummy;
! 425: ptr_t sp = (ptr_t)(&dummy);
! 426: ptr_t trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
! 427: word size = GC_get_writable_length(trunc_sp, 0);
! 428:
! 429: return(trunc_sp + size);
! 430: }
! 431:
! 432:
! 433: # else
! 434:
! 435: # ifdef OS2
! 436:
! 437: ptr_t GC_get_stack_base()
! 438: {
! 439: PTIB ptib;
! 440: PPIB ppib;
! 441:
! 442: if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
! 443: GC_err_printf0("DosGetInfoBlocks failed\n");
! 444: ABORT("DosGetInfoBlocks failed\n");
! 445: }
! 446: return((ptr_t)(ptib -> tib_pstacklimit));
! 447: }
! 448:
! 449: # else
! 450:
! 451: # ifdef AMIGA
! 452:
! 453: ptr_t GC_get_stack_base()
! 454: {
! 455: struct Process *proc = (struct Process*)SysBase->ThisTask;
! 456:
! 457: /* Reference: Amiga Guru Book Pages: 42,567,574 */
! 458: if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS
! 459: && proc->pr_CLI != NULL) {
! 460: /* first ULONG is StackSize */
! 461: /*longPtr = proc->pr_ReturnAddr;
! 462: size = longPtr[0];*/
! 463:
! 464: return (char *)proc->pr_ReturnAddr + sizeof(ULONG);
! 465: } else {
! 466: return (char *)proc->pr_Task.tc_SPUpper;
! 467: }
! 468: }
! 469:
! 470: #if 0 /* old version */
! 471: ptr_t GC_get_stack_base()
! 472: {
! 473: extern struct WBStartup *_WBenchMsg;
! 474: extern long __base;
! 475: extern long __stack;
! 476: struct Task *task;
! 477: struct Process *proc;
! 478: struct CommandLineInterface *cli;
! 479: long size;
! 480:
! 481: if ((task = FindTask(0)) == 0) {
! 482: GC_err_puts("Cannot find own task structure\n");
! 483: ABORT("task missing");
! 484: }
! 485: proc = (struct Process *)task;
! 486: cli = BADDR(proc->pr_CLI);
! 487:
! 488: if (_WBenchMsg != 0 || cli == 0) {
! 489: size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
! 490: } else {
! 491: size = cli->cli_DefaultStack * 4;
! 492: }
! 493: return (ptr_t)(__base + GC_max(size, __stack));
! 494: }
! 495: #endif /* 0 */
! 496:
! 497: # else /* !AMIGA, !OS2, ... */
! 498:
! 499: # ifdef NEED_FIND_LIMIT
! 500: /* Some tools to implement HEURISTIC2 */
! 501: # define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
! 502: /* static */ jmp_buf GC_jmp_buf;
! 503:
! 504: /*ARGSUSED*/
! 505: void GC_fault_handler(sig)
! 506: int sig;
! 507: {
! 508: longjmp(GC_jmp_buf, 1);
! 509: }
! 510:
! 511: # ifdef __STDC__
! 512: typedef void (*handler)(int);
! 513: # else
! 514: typedef void (*handler)();
! 515: # endif
! 516:
! 517: # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
! 518: static struct sigaction old_segv_act;
! 519: # if defined(_sigargs) /* !Irix6.x */
! 520: static struct sigaction old_bus_act;
! 521: # endif
! 522: # else
! 523: static handler old_segv_handler, old_bus_handler;
! 524: # endif
! 525:
! 526: void GC_setup_temporary_fault_handler()
! 527: {
! 528: # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
! 529: struct sigaction act;
! 530:
! 531: act.sa_handler = GC_fault_handler;
! 532: act.sa_flags = SA_RESTART | SA_NODEFER;
! 533: /* The presence of SA_NODEFER represents yet another gross */
! 534: /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
! 535: /* interact correctly with -lthread. We hide the confusion */
! 536: /* by making sure that signal handling doesn't affect the */
! 537: /* signal mask. */
! 538:
! 539: (void) sigemptyset(&act.sa_mask);
! 540: # ifdef IRIX_THREADS
! 541: /* Older versions have a bug related to retrieving and */
! 542: /* and setting a handler at the same time. */
! 543: (void) sigaction(SIGSEGV, 0, &old_segv_act);
! 544: (void) sigaction(SIGSEGV, &act, 0);
! 545: # else
! 546: (void) sigaction(SIGSEGV, &act, &old_segv_act);
! 547: # ifdef _sigargs /* Irix 5.x, not 6.x */
! 548: /* Under 5.x, we may get SIGBUS. */
! 549: /* Pthreads doesn't exist under 5.x, so we don't */
! 550: /* have to worry in the threads case. */
! 551: (void) sigaction(SIGBUS, &act, &old_bus_act);
! 552: # endif
! 553: # endif /* IRIX_THREADS */
! 554: # else
! 555: old_segv_handler = signal(SIGSEGV, GC_fault_handler);
! 556: # ifdef SIGBUS
! 557: old_bus_handler = signal(SIGBUS, GC_fault_handler);
! 558: # endif
! 559: # endif
! 560: }
! 561:
! 562: void GC_reset_fault_handler()
! 563: {
! 564: # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
! 565: (void) sigaction(SIGSEGV, &old_segv_act, 0);
! 566: # ifdef _sigargs /* Irix 5.x, not 6.x */
! 567: (void) sigaction(SIGBUS, &old_bus_act, 0);
! 568: # endif
! 569: # else
! 570: (void) signal(SIGSEGV, old_segv_handler);
! 571: # ifdef SIGBUS
! 572: (void) signal(SIGBUS, old_bus_handler);
! 573: # endif
! 574: # endif
! 575: }
! 576:
! 577: /* Return the first nonaddressible location > p (up) or */
! 578: /* the smallest location q s.t. [q,p] is addressible (!up). */
! 579: ptr_t GC_find_limit(p, up)
! 580: ptr_t p;
! 581: GC_bool up;
! 582: {
! 583: static VOLATILE ptr_t result;
! 584: /* Needs to be static, since otherwise it may not be */
! 585: /* preserved across the longjmp. Can safely be */
! 586: /* static since it's only called once, with the */
! 587: /* allocation lock held. */
! 588:
! 589:
! 590: GC_setup_temporary_fault_handler();
! 591: if (setjmp(GC_jmp_buf) == 0) {
! 592: result = (ptr_t)(((word)(p))
! 593: & ~(MIN_PAGE_SIZE-1));
! 594: for (;;) {
! 595: if (up) {
! 596: result += MIN_PAGE_SIZE;
! 597: } else {
! 598: result -= MIN_PAGE_SIZE;
! 599: }
! 600: GC_noop1((word)(*result));
! 601: }
! 602: }
! 603: GC_reset_fault_handler();
! 604: if (!up) {
! 605: result += MIN_PAGE_SIZE;
! 606: }
! 607: return(result);
! 608: }
! 609: # endif
! 610:
! 611:
! 612: ptr_t GC_get_stack_base()
! 613: {
! 614: word dummy;
! 615: ptr_t result;
! 616:
! 617: # define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
! 618:
! 619: # ifdef STACKBOTTOM
! 620: return(STACKBOTTOM);
! 621: # else
! 622: # ifdef HEURISTIC1
! 623: # ifdef STACK_GROWS_DOWN
! 624: result = (ptr_t)((((word)(&dummy))
! 625: + STACKBOTTOM_ALIGNMENT_M1)
! 626: & ~STACKBOTTOM_ALIGNMENT_M1);
! 627: # else
! 628: result = (ptr_t)(((word)(&dummy))
! 629: & ~STACKBOTTOM_ALIGNMENT_M1);
! 630: # endif
! 631: # endif /* HEURISTIC1 */
! 632: # ifdef HEURISTIC2
! 633: # ifdef STACK_GROWS_DOWN
! 634: result = GC_find_limit((ptr_t)(&dummy), TRUE);
! 635: # ifdef HEURISTIC2_LIMIT
! 636: if (result > HEURISTIC2_LIMIT
! 637: && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
! 638: result = HEURISTIC2_LIMIT;
! 639: }
! 640: # endif
! 641: # else
! 642: result = GC_find_limit((ptr_t)(&dummy), FALSE);
! 643: # ifdef HEURISTIC2_LIMIT
! 644: if (result < HEURISTIC2_LIMIT
! 645: && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
! 646: result = HEURISTIC2_LIMIT;
! 647: }
! 648: # endif
! 649: # endif
! 650:
! 651: # endif /* HEURISTIC2 */
! 652: # ifdef STACK_GROWS_DOWN
! 653: if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
! 654: # endif
! 655: return(result);
! 656: # endif /* STACKBOTTOM */
! 657: }
! 658:
! 659: # endif /* ! AMIGA */
! 660: # endif /* ! OS2 */
! 661: # endif /* ! MSWIN32 */
! 662:
! 663: /*
! 664: * Register static data segment(s) as roots.
! 665: * If more data segments are added later then they need to be registered
! 666: * add that point (as we do with SunOS dynamic loading),
! 667: * or GC_mark_roots needs to check for them (as we do with PCR).
! 668: * Called with allocator lock held.
! 669: */
! 670:
! 671: # ifdef OS2
! 672:
! 673: void GC_register_data_segments()
! 674: {
! 675: PTIB ptib;
! 676: PPIB ppib;
! 677: HMODULE module_handle;
! 678: # define PBUFSIZ 512
! 679: UCHAR path[PBUFSIZ];
! 680: FILE * myexefile;
! 681: struct exe_hdr hdrdos; /* MSDOS header. */
! 682: struct e32_exe hdr386; /* Real header for my executable */
! 683: struct o32_obj seg; /* Currrent segment */
! 684: int nsegs;
! 685:
! 686:
! 687: if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
! 688: GC_err_printf0("DosGetInfoBlocks failed\n");
! 689: ABORT("DosGetInfoBlocks failed\n");
! 690: }
! 691: module_handle = ppib -> pib_hmte;
! 692: if (DosQueryModuleName(module_handle, PBUFSIZ, path) != NO_ERROR) {
! 693: GC_err_printf0("DosQueryModuleName failed\n");
! 694: ABORT("DosGetInfoBlocks failed\n");
! 695: }
! 696: myexefile = fopen(path, "rb");
! 697: if (myexefile == 0) {
! 698: GC_err_puts("Couldn't open executable ");
! 699: GC_err_puts(path); GC_err_puts("\n");
! 700: ABORT("Failed to open executable\n");
! 701: }
! 702: if (fread((char *)(&hdrdos), 1, sizeof hdrdos, myexefile) < sizeof hdrdos) {
! 703: GC_err_puts("Couldn't read MSDOS header from ");
! 704: GC_err_puts(path); GC_err_puts("\n");
! 705: ABORT("Couldn't read MSDOS header");
! 706: }
! 707: if (E_MAGIC(hdrdos) != EMAGIC) {
! 708: GC_err_puts("Executable has wrong DOS magic number: ");
! 709: GC_err_puts(path); GC_err_puts("\n");
! 710: ABORT("Bad DOS magic number");
! 711: }
! 712: if (fseek(myexefile, E_LFANEW(hdrdos), SEEK_SET) != 0) {
! 713: GC_err_puts("Seek to new header failed in ");
! 714: GC_err_puts(path); GC_err_puts("\n");
! 715: ABORT("Bad DOS magic number");
! 716: }
! 717: if (fread((char *)(&hdr386), 1, sizeof hdr386, myexefile) < sizeof hdr386) {
! 718: GC_err_puts("Couldn't read MSDOS header from ");
! 719: GC_err_puts(path); GC_err_puts("\n");
! 720: ABORT("Couldn't read OS/2 header");
! 721: }
! 722: if (E32_MAGIC1(hdr386) != E32MAGIC1 || E32_MAGIC2(hdr386) != E32MAGIC2) {
! 723: GC_err_puts("Executable has wrong OS/2 magic number:");
! 724: GC_err_puts(path); GC_err_puts("\n");
! 725: ABORT("Bad OS/2 magic number");
! 726: }
! 727: if ( E32_BORDER(hdr386) != E32LEBO || E32_WORDER(hdr386) != E32LEWO) {
! 728: GC_err_puts("Executable %s has wrong byte order: ");
! 729: GC_err_puts(path); GC_err_puts("\n");
! 730: ABORT("Bad byte order");
! 731: }
! 732: if ( E32_CPU(hdr386) == E32CPU286) {
! 733: GC_err_puts("GC can't handle 80286 executables: ");
! 734: GC_err_puts(path); GC_err_puts("\n");
! 735: EXIT();
! 736: }
! 737: if (fseek(myexefile, E_LFANEW(hdrdos) + E32_OBJTAB(hdr386),
! 738: SEEK_SET) != 0) {
! 739: GC_err_puts("Seek to object table failed: ");
! 740: GC_err_puts(path); GC_err_puts("\n");
! 741: ABORT("Seek to object table failed");
! 742: }
! 743: for (nsegs = E32_OBJCNT(hdr386); nsegs > 0; nsegs--) {
! 744: int flags;
! 745: if (fread((char *)(&seg), 1, sizeof seg, myexefile) < sizeof seg) {
! 746: GC_err_puts("Couldn't read obj table entry from ");
! 747: GC_err_puts(path); GC_err_puts("\n");
! 748: ABORT("Couldn't read obj table entry");
! 749: }
! 750: flags = O32_FLAGS(seg);
! 751: if (!(flags & OBJWRITE)) continue;
! 752: if (!(flags & OBJREAD)) continue;
! 753: if (flags & OBJINVALID) {
! 754: GC_err_printf0("Object with invalid pages?\n");
! 755: continue;
! 756: }
! 757: GC_add_roots_inner(O32_BASE(seg), O32_BASE(seg)+O32_SIZE(seg), FALSE);
! 758: }
! 759: }
! 760:
! 761: # else
! 762:
! 763: # ifdef MSWIN32
! 764: /* Unfortunately, we have to handle win32s very differently from NT, */
! 765: /* Since VirtualQuery has very different semantics. In particular, */
! 766: /* under win32s a VirtualQuery call on an unmapped page returns an */
! 767: /* invalid result. Under GC_register_data_segments is a noop and */
! 768: /* all real work is done by GC_register_dynamic_libraries. Under */
! 769: /* win32s, we cannot find the data segments associated with dll's. */
! 770: /* We rgister the main data segment here. */
! 771: GC_bool GC_win32s = FALSE; /* We're running under win32s. */
! 772:
! 773: GC_bool GC_is_win32s()
! 774: {
! 775: DWORD v = GetVersion();
! 776:
! 777: /* Check that this is not NT, and Windows major version <= 3 */
! 778: return ((v & 0x80000000) && (v & 0xff) <= 3);
! 779: }
! 780:
! 781: void GC_init_win32()
! 782: {
! 783: GC_win32s = GC_is_win32s();
! 784: }
! 785:
! 786: /* Return the smallest address a such that VirtualQuery */
! 787: /* returns correct results for all addresses between a and start. */
! 788: /* Assumes VirtualQuery returns correct information for start. */
! 789: ptr_t GC_least_described_address(ptr_t start)
! 790: {
! 791: MEMORY_BASIC_INFORMATION buf;
! 792: SYSTEM_INFO sysinfo;
! 793: DWORD result;
! 794: LPVOID limit;
! 795: ptr_t p;
! 796: LPVOID q;
! 797:
! 798: GetSystemInfo(&sysinfo);
! 799: limit = sysinfo.lpMinimumApplicationAddress;
! 800: p = (ptr_t)((word)start & ~(GC_page_size - 1));
! 801: for (;;) {
! 802: q = (LPVOID)(p - GC_page_size);
! 803: if ((ptr_t)q > (ptr_t)p /* underflow */ || q < limit) break;
! 804: result = VirtualQuery(q, &buf, sizeof(buf));
! 805: if (result != sizeof(buf) || buf.AllocationBase == 0) break;
! 806: p = (ptr_t)(buf.AllocationBase);
! 807: }
! 808: return(p);
! 809: }
! 810:
! 811: /* Is p the start of either the malloc heap, or of one of our */
! 812: /* heap sections? */
! 813: GC_bool GC_is_heap_base (ptr_t p)
! 814: {
! 815:
! 816: register unsigned i;
! 817:
! 818: # ifndef REDIRECT_MALLOC
! 819: static ptr_t malloc_heap_pointer = 0;
! 820:
! 821: if (0 == malloc_heap_pointer) {
! 822: MEMORY_BASIC_INFORMATION buf;
! 823: register DWORD result = VirtualQuery(malloc(1), &buf, sizeof(buf));
! 824:
! 825: if (result != sizeof(buf)) {
! 826: ABORT("Weird VirtualQuery result");
! 827: }
! 828: malloc_heap_pointer = (ptr_t)(buf.AllocationBase);
! 829: }
! 830: if (p == malloc_heap_pointer) return(TRUE);
! 831: # endif
! 832: for (i = 0; i < GC_n_heap_bases; i++) {
! 833: if (GC_heap_bases[i] == p) return(TRUE);
! 834: }
! 835: return(FALSE);
! 836: }
! 837:
! 838: void GC_register_root_section(ptr_t static_root)
! 839: {
! 840: MEMORY_BASIC_INFORMATION buf;
! 841: SYSTEM_INFO sysinfo;
! 842: DWORD result;
! 843: DWORD protect;
! 844: LPVOID p;
! 845: char * base;
! 846: char * limit, * new_limit;
! 847:
! 848: if (!GC_win32s) return;
! 849: p = base = limit = GC_least_described_address(static_root);
! 850: GetSystemInfo(&sysinfo);
! 851: while (p < sysinfo.lpMaximumApplicationAddress) {
! 852: result = VirtualQuery(p, &buf, sizeof(buf));
! 853: if (result != sizeof(buf) || buf.AllocationBase == 0
! 854: || GC_is_heap_base(buf.AllocationBase)) break;
! 855: new_limit = (char *)p + buf.RegionSize;
! 856: protect = buf.Protect;
! 857: if (buf.State == MEM_COMMIT
! 858: && is_writable(protect)) {
! 859: if ((char *)p == limit) {
! 860: limit = new_limit;
! 861: } else {
! 862: if (base != limit) GC_add_roots_inner(base, limit, FALSE);
! 863: base = p;
! 864: limit = new_limit;
! 865: }
! 866: }
! 867: if (p > (LPVOID)new_limit /* overflow */) break;
! 868: p = (LPVOID)new_limit;
! 869: }
! 870: if (base != limit) GC_add_roots_inner(base, limit, FALSE);
! 871: }
! 872:
! 873: void GC_register_data_segments()
! 874: {
! 875: static char dummy;
! 876:
! 877: GC_register_root_section((ptr_t)(&dummy));
! 878: }
! 879: # else
! 880: # ifdef AMIGA
! 881:
! 882: void GC_register_data_segments()
! 883: {
! 884: struct Process *proc;
! 885: struct CommandLineInterface *cli;
! 886: BPTR myseglist;
! 887: ULONG *data;
! 888:
! 889: int num;
! 890:
! 891:
! 892: # ifdef __GNUC__
! 893: ULONG dataSegSize;
! 894: GC_bool found_segment = FALSE;
! 895: extern char __data_size[];
! 896:
! 897: dataSegSize=__data_size+8;
! 898: /* Can`t find the Location of __data_size, because
! 899: it`s possible that is it, inside the segment. */
! 900:
! 901: # endif
! 902:
! 903: proc= (struct Process*)SysBase->ThisTask;
! 904:
! 905: /* Reference: Amiga Guru Book Pages: 538ff,565,573
! 906: and XOper.asm */
! 907: if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS) {
! 908: if (proc->pr_CLI == NULL) {
! 909: myseglist = proc->pr_SegList;
! 910: } else {
! 911: /* ProcLoaded 'Loaded as a command: '*/
! 912: cli = BADDR(proc->pr_CLI);
! 913: myseglist = cli->cli_Module;
! 914: }
! 915: } else {
! 916: ABORT("Not a Process.");
! 917: }
! 918:
! 919: if (myseglist == NULL) {
! 920: ABORT("Arrrgh.. can't find segments, aborting");
! 921: }
! 922:
! 923: /* xoper hunks Shell Process */
! 924:
! 925: num=0;
! 926: for (data = (ULONG *)BADDR(myseglist); data != NULL;
! 927: data = (ULONG *)BADDR(data[0])) {
! 928: if (((ULONG) GC_register_data_segments < (ULONG) &data[1]) ||
! 929: ((ULONG) GC_register_data_segments > (ULONG) &data[1] + data[-1])) {
! 930: # ifdef __GNUC__
! 931: if (dataSegSize == data[-1]) {
! 932: found_segment = TRUE;
! 933: }
! 934: # endif
! 935: GC_add_roots_inner((char *)&data[1],
! 936: ((char *)&data[1]) + data[-1], FALSE);
! 937: }
! 938: ++num;
! 939: } /* for */
! 940: # ifdef __GNUC__
! 941: if (!found_segment) {
! 942: ABORT("Can`t find correct Segments.\nSolution: Use an newer version of ixemul.library");
! 943: }
! 944: # endif
! 945: }
! 946:
! 947: #if 0 /* old version */
! 948: void GC_register_data_segments()
! 949: {
! 950: extern struct WBStartup *_WBenchMsg;
! 951: struct Process *proc;
! 952: struct CommandLineInterface *cli;
! 953: BPTR myseglist;
! 954: ULONG *data;
! 955:
! 956: if ( _WBenchMsg != 0 ) {
! 957: if ((myseglist = _WBenchMsg->sm_Segment) == 0) {
! 958: GC_err_puts("No seglist from workbench\n");
! 959: return;
! 960: }
! 961: } else {
! 962: if ((proc = (struct Process *)FindTask(0)) == 0) {
! 963: GC_err_puts("Cannot find process structure\n");
! 964: return;
! 965: }
! 966: if ((cli = BADDR(proc->pr_CLI)) == 0) {
! 967: GC_err_puts("No CLI\n");
! 968: return;
! 969: }
! 970: if ((myseglist = cli->cli_Module) == 0) {
! 971: GC_err_puts("No seglist from CLI\n");
! 972: return;
! 973: }
! 974: }
! 975:
! 976: for (data = (ULONG *)BADDR(myseglist); data != 0;
! 977: data = (ULONG *)BADDR(data[0])) {
! 978: # ifdef AMIGA_SKIP_SEG
! 979: if (((ULONG) GC_register_data_segments < (ULONG) &data[1]) ||
! 980: ((ULONG) GC_register_data_segments > (ULONG) &data[1] + data[-1])) {
! 981: # else
! 982: {
! 983: # endif /* AMIGA_SKIP_SEG */
! 984: GC_add_roots_inner((char *)&data[1],
! 985: ((char *)&data[1]) + data[-1], FALSE);
! 986: }
! 987: }
! 988: }
! 989: #endif /* old version */
! 990:
! 991:
! 992: # else
! 993:
! 994: # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
! 995: char * GC_SysVGetDataStart(max_page_size, etext_addr)
! 996: int max_page_size;
! 997: int * etext_addr;
! 998: {
! 999: word text_end = ((word)(etext_addr) + sizeof(word) - 1)
! 1000: & ~(sizeof(word) - 1);
! 1001: /* etext rounded to word boundary */
! 1002: word next_page = ((text_end + (word)max_page_size - 1)
! 1003: & ~((word)max_page_size - 1));
! 1004: word page_offset = (text_end & ((word)max_page_size - 1));
! 1005: VOLATILE char * result = (char *)(next_page + page_offset);
! 1006: /* Note that this isnt equivalent to just adding */
! 1007: /* max_page_size to &etext if &etext is at a page boundary */
! 1008:
! 1009: GC_setup_temporary_fault_handler();
! 1010: if (setjmp(GC_jmp_buf) == 0) {
! 1011: /* Try writing to the address. */
! 1012: *result = *result;
! 1013: GC_reset_fault_handler();
! 1014: } else {
! 1015: GC_reset_fault_handler();
! 1016: /* We got here via a longjmp. The address is not readable. */
! 1017: /* This is known to happen under Solaris 2.4 + gcc, which place */
! 1018: /* string constants in the text segment, but after etext. */
! 1019: /* Use plan B. Note that we now know there is a gap between */
! 1020: /* text and data segments, so plan A bought us something. */
! 1021: result = (char *)GC_find_limit((ptr_t)(DATAEND) - MIN_PAGE_SIZE, FALSE);
! 1022: }
! 1023: return((char *)result);
! 1024: }
! 1025: # endif
! 1026:
! 1027:
! 1028: void GC_register_data_segments()
! 1029: {
! 1030: # if !defined(PCR) && !defined(SRC_M3) && !defined(NEXT) && !defined(MACOS) \
! 1031: && !defined(MACOSX)
! 1032: # if defined(REDIRECT_MALLOC) && defined(SOLARIS_THREADS)
! 1033: /* As of Solaris 2.3, the Solaris threads implementation */
! 1034: /* allocates the data structure for the initial thread with */
! 1035: /* sbrk at process startup. It needs to be scanned, so that */
! 1036: /* we don't lose some malloc allocated data structures */
! 1037: /* hanging from it. We're on thin ice here ... */
! 1038: extern caddr_t sbrk();
! 1039:
! 1040: GC_add_roots_inner(DATASTART, (char *)sbrk(0), FALSE);
! 1041: # else
! 1042: GC_add_roots_inner(DATASTART, (char *)(DATAEND), FALSE);
! 1043: # endif
! 1044: # endif
! 1045: # if !defined(PCR) && (defined(NEXT) || defined(MACOSX))
! 1046: GC_add_roots_inner(DATASTART, (char *) get_end(), FALSE);
! 1047: # endif
! 1048: # if defined(MACOS)
! 1049: {
! 1050: # if defined(THINK_C)
! 1051: extern void* GC_MacGetDataStart(void);
! 1052: /* globals begin above stack and end at a5. */
! 1053: GC_add_roots_inner((ptr_t)GC_MacGetDataStart(),
! 1054: (ptr_t)LMGetCurrentA5(), FALSE);
! 1055: # else
! 1056: # if defined(__MWERKS__)
! 1057: # if !__POWERPC__
! 1058: extern void* GC_MacGetDataStart(void);
! 1059: /* MATTHEW: Function to handle Far Globals (CW Pro 3) */
! 1060: # if __option(far_data)
! 1061: extern void* GC_MacGetDataEnd(void);
! 1062: # endif
! 1063: /* globals begin above stack and end at a5. */
! 1064: GC_add_roots_inner((ptr_t)GC_MacGetDataStart(),
! 1065: (ptr_t)LMGetCurrentA5(), FALSE);
! 1066: /* MATTHEW: Handle Far Globals */
! 1067: # if __option(far_data)
! 1068: /* Far globals follow he QD globals: */
! 1069: GC_add_roots_inner((ptr_t)LMGetCurrentA5(),
! 1070: (ptr_t)GC_MacGetDataEnd(), FALSE);
! 1071: # endif
! 1072: # else
! 1073: extern char __data_start__[], __data_end__[];
! 1074: GC_add_roots_inner((ptr_t)&__data_start__,
! 1075: (ptr_t)&__data_end__, FALSE);
! 1076: # endif /* __POWERPC__ */
! 1077: # endif /* __MWERKS__ */
! 1078: # endif /* !THINK_C */
! 1079: }
! 1080: # endif /* MACOS */
! 1081:
! 1082: /* Dynamic libraries are added at every collection, since they may */
! 1083: /* change. */
! 1084: }
! 1085:
! 1086: # endif /* ! AMIGA */
! 1087: # endif /* ! MSWIN32 */
! 1088: # endif /* ! OS2 */
! 1089:
! 1090: /*
! 1091: * Auxiliary routines for obtaining memory from OS.
! 1092: */
! 1093:
! 1094: # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) \
! 1095: && !defined(MSWIN32) && !defined(MACOS) && !defined(DOS4GW)
! 1096:
! 1097: # ifdef SUNOS4
! 1098: extern caddr_t sbrk();
! 1099: # endif
! 1100: # ifdef __STDC__
! 1101: # define SBRK_ARG_T ptrdiff_t
! 1102: # else
! 1103: # define SBRK_ARG_T int
! 1104: # endif
! 1105:
! 1106: # ifdef RS6000
! 1107: /* The compiler seems to generate speculative reads one past the end of */
! 1108: /* an allocated object. Hence we need to make sure that the page */
! 1109: /* following the last heap page is also mapped. */
! 1110: ptr_t GC_unix_get_mem(bytes)
! 1111: word bytes;
! 1112: {
! 1113: caddr_t cur_brk = (caddr_t)sbrk(0);
! 1114: caddr_t result;
! 1115: SBRK_ARG_T lsbs = (word)cur_brk & (GC_page_size-1);
! 1116: static caddr_t my_brk_val = 0;
! 1117:
! 1118: if ((SBRK_ARG_T)bytes < 0) return(0); /* too big */
! 1119: if (lsbs != 0) {
! 1120: if((caddr_t)(sbrk(GC_page_size - lsbs)) == (caddr_t)(-1)) return(0);
! 1121: }
! 1122: if (cur_brk == my_brk_val) {
! 1123: /* Use the extra block we allocated last time. */
! 1124: result = (ptr_t)sbrk((SBRK_ARG_T)bytes);
! 1125: if (result == (caddr_t)(-1)) return(0);
! 1126: result -= GC_page_size;
! 1127: } else {
! 1128: result = (ptr_t)sbrk(GC_page_size + (SBRK_ARG_T)bytes);
! 1129: if (result == (caddr_t)(-1)) return(0);
! 1130: }
! 1131: my_brk_val = result + bytes + GC_page_size; /* Always page aligned */
! 1132: return((ptr_t)result);
! 1133: }
! 1134:
! 1135: #else /* Not RS6000 */
! 1136:
! 1137: #if defined(USE_MMAP)
! 1138: /* Tested only under IRIX5 and Solaris 2 */
! 1139:
! 1140: #ifdef USE_MMAP_FIXED
! 1141: # define GC_MMAP_FLAGS MAP_FIXED | MAP_PRIVATE
! 1142: /* Seems to yield better performance on Solaris 2, but can */
! 1143: /* be unreliable if something is already mapped at the address. */
! 1144: #else
! 1145: # define GC_MMAP_FLAGS MAP_PRIVATE
! 1146: #endif
! 1147:
! 1148: ptr_t GC_unix_get_mem(bytes)
! 1149: word bytes;
! 1150: {
! 1151: static GC_bool initialized = FALSE;
! 1152: static int fd;
! 1153: void *result;
! 1154: static ptr_t last_addr = HEAP_START;
! 1155:
! 1156: if (!initialized) {
! 1157: fd = open("/dev/zero", O_RDONLY);
! 1158: initialized = TRUE;
! 1159: }
! 1160: if (bytes & (GC_page_size -1)) ABORT("Bad GET_MEM arg");
! 1161: result = mmap(last_addr, bytes, PROT_READ | PROT_WRITE | OPT_PROT_EXEC,
! 1162: GC_MMAP_FLAGS, fd, 0/* offset */);
! 1163: if (result == MAP_FAILED) return(0);
! 1164: last_addr = (ptr_t)result + bytes + GC_page_size - 1;
! 1165: last_addr = (ptr_t)((word)last_addr & ~(GC_page_size - 1));
! 1166: return((ptr_t)result);
! 1167: }
! 1168:
! 1169: #else /* Not RS6000, not USE_MMAP */
! 1170: ptr_t GC_unix_get_mem(bytes)
! 1171: word bytes;
! 1172: {
! 1173: ptr_t result;
! 1174: # ifdef IRIX5
! 1175: /* Bare sbrk isn't thread safe. Play by malloc rules. */
! 1176: /* The equivalent may be needed on other systems as well. */
! 1177: __LOCK_MALLOC();
! 1178: # endif
! 1179: {
! 1180: ptr_t cur_brk = (ptr_t)sbrk(0);
! 1181: SBRK_ARG_T lsbs = (word)cur_brk & (GC_page_size-1);
! 1182:
! 1183: if ((SBRK_ARG_T)bytes < 0) return(0); /* too big */
! 1184: if (lsbs != 0) {
! 1185: if((ptr_t)sbrk(GC_page_size - lsbs) == (ptr_t)(-1)) return(0);
! 1186: }
! 1187: result = (ptr_t)sbrk((SBRK_ARG_T)bytes);
! 1188: if (result == (ptr_t)(-1)) result = 0;
! 1189: }
! 1190: # ifdef IRIX5
! 1191: __UNLOCK_MALLOC();
! 1192: # endif
! 1193: return(result);
! 1194: }
! 1195:
! 1196: #endif /* Not USE_MMAP */
! 1197: #endif /* Not RS6000 */
! 1198:
! 1199: # endif /* UN*X */
! 1200:
! 1201: # ifdef OS2
! 1202:
! 1203: void * os2_alloc(size_t bytes)
! 1204: {
! 1205: void * result;
! 1206:
! 1207: if (DosAllocMem(&result, bytes, PAG_EXECUTE | PAG_READ |
! 1208: PAG_WRITE | PAG_COMMIT)
! 1209: != NO_ERROR) {
! 1210: return(0);
! 1211: }
! 1212: if (result == 0) return(os2_alloc(bytes));
! 1213: return(result);
! 1214: }
! 1215:
! 1216: # endif /* OS2 */
! 1217:
! 1218:
! 1219: # ifdef MSWIN32
! 1220: word GC_n_heap_bases = 0;
! 1221:
! 1222: ptr_t GC_win32_get_mem(bytes)
! 1223: word bytes;
! 1224: {
! 1225: ptr_t result;
! 1226:
! 1227: if (GC_win32s) {
! 1228: /* VirtualAlloc doesn't like PAGE_EXECUTE_READWRITE. */
! 1229: /* There are also unconfirmed rumors of other */
! 1230: /* problems, so we dodge the issue. */
! 1231: result = (ptr_t) GlobalAlloc(0, bytes + HBLKSIZE);
! 1232: result = (ptr_t)(((word)result + HBLKSIZE) & ~(HBLKSIZE-1));
! 1233: } else {
! 1234: result = (ptr_t) VirtualAlloc(NULL, bytes,
! 1235: MEM_COMMIT | MEM_RESERVE,
! 1236: PAGE_EXECUTE_READWRITE);
! 1237: }
! 1238: if (HBLKDISPL(result) != 0) ABORT("Bad VirtualAlloc result");
! 1239: /* If I read the documentation correctly, this can */
! 1240: /* only happen if HBLKSIZE > 64k or not a power of 2. */
! 1241: if (GC_n_heap_bases >= MAX_HEAP_SECTS) ABORT("Too many heap sections");
! 1242: GC_heap_bases[GC_n_heap_bases++] = result;
! 1243: return(result);
! 1244: }
! 1245:
! 1246: void GC_win32_free_heap ()
! 1247: {
! 1248: if (GC_win32s) {
! 1249: while (GC_n_heap_bases > 0) {
! 1250: GlobalFree (GC_heap_bases[--GC_n_heap_bases]);
! 1251: GC_heap_bases[GC_n_heap_bases] = 0;
! 1252: }
! 1253: }
! 1254: }
! 1255:
! 1256:
! 1257: # endif
! 1258:
! 1259: #ifdef USE_MUNMAP
! 1260:
! 1261: /* For now, this only works on some Unix-like systems. If you */
! 1262: /* have something else, don't define USE_MUNMAP. */
! 1263: /* We assume ANSI C to support this feature. */
! 1264: #include <unistd.h>
! 1265: #include <sys/mman.h>
! 1266: #include <sys/stat.h>
! 1267: #include <sys/types.h>
! 1268: #include <fcntl.h>
! 1269:
! 1270: /* Compute a page aligned starting address for the unmap */
! 1271: /* operation on a block of size bytes starting at start. */
! 1272: /* Return 0 if the block is too small to make this feasible. */
! 1273: ptr_t GC_unmap_start(ptr_t start, word bytes)
! 1274: {
! 1275: ptr_t result = start;
! 1276: /* Round start to next page boundary. */
! 1277: result += GC_page_size - 1;
! 1278: result = (ptr_t)((word)result & ~(GC_page_size - 1));
! 1279: if (result + GC_page_size > start + bytes) return 0;
! 1280: return result;
! 1281: }
! 1282:
! 1283: /* Compute end address for an unmap operation on the indicated */
! 1284: /* block. */
! 1285: ptr_t GC_unmap_end(ptr_t start, word bytes)
! 1286: {
! 1287: ptr_t end_addr = start + bytes;
! 1288: end_addr = (ptr_t)((word)end_addr & ~(GC_page_size - 1));
! 1289: return end_addr;
! 1290: }
! 1291:
! 1292: /* We assume that GC_remap is called on exactly the same range */
! 1293: /* as a previous call to GC_unmap. It is safe to consistently */
! 1294: /* round the endpoints in both places. */
! 1295: void GC_unmap(ptr_t start, word bytes)
! 1296: {
! 1297: ptr_t start_addr = GC_unmap_start(start, bytes);
! 1298: ptr_t end_addr = GC_unmap_end(start, bytes);
! 1299: word len = end_addr - start_addr;
! 1300: if (0 == start_addr) return;
! 1301: if (munmap(start_addr, len) != 0) ABORT("munmap failed");
! 1302: GC_unmapped_bytes += len;
! 1303: }
! 1304:
! 1305:
! 1306: void GC_remap(ptr_t start, word bytes)
! 1307: {
! 1308: static int zero_descr = -1;
! 1309: ptr_t start_addr = GC_unmap_start(start, bytes);
! 1310: ptr_t end_addr = GC_unmap_end(start, bytes);
! 1311: word len = end_addr - start_addr;
! 1312: ptr_t result;
! 1313:
! 1314: if (-1 == zero_descr) zero_descr = open("/dev/zero", O_RDWR);
! 1315: if (0 == start_addr) return;
! 1316: result = mmap(start_addr, len, PROT_READ | PROT_WRITE | OPT_PROT_EXEC,
! 1317: MAP_FIXED | MAP_PRIVATE, zero_descr, 0);
! 1318: if (result != start_addr) {
! 1319: ABORT("mmap remapping failed");
! 1320: }
! 1321: GC_unmapped_bytes -= len;
! 1322: }
! 1323:
! 1324: /* Two adjacent blocks have already been unmapped and are about to */
! 1325: /* be merged. Unmap the whole block. This typically requires */
! 1326: /* that we unmap a small section in the middle that was not previously */
! 1327: /* unmapped due to alignment constraints. */
! 1328: void GC_unmap_gap(ptr_t start1, word bytes1, ptr_t start2, word bytes2)
! 1329: {
! 1330: ptr_t start1_addr = GC_unmap_start(start1, bytes1);
! 1331: ptr_t end1_addr = GC_unmap_end(start1, bytes1);
! 1332: ptr_t start2_addr = GC_unmap_start(start2, bytes2);
! 1333: ptr_t end2_addr = GC_unmap_end(start2, bytes2);
! 1334: ptr_t start_addr = end1_addr;
! 1335: ptr_t end_addr = start2_addr;
! 1336: word len;
! 1337: GC_ASSERT(start1 + bytes1 == start2);
! 1338: if (0 == start1_addr) start_addr = GC_unmap_start(start1, bytes1 + bytes2);
! 1339: if (0 == start2_addr) end_addr = GC_unmap_end(start1, bytes1 + bytes2);
! 1340: if (0 == start_addr) return;
! 1341: len = end_addr - start_addr;
! 1342: if (len != 0 && munmap(start_addr, len) != 0) ABORT("munmap failed");
! 1343: GC_unmapped_bytes += len;
! 1344: }
! 1345:
! 1346: #endif /* USE_MUNMAP */
! 1347:
! 1348: /* Routine for pushing any additional roots. In THREADS */
! 1349: /* environment, this is also responsible for marking from */
! 1350: /* thread stacks. In the SRC_M3 case, it also handles */
! 1351: /* global variables. */
! 1352: #ifndef THREADS
! 1353: void (*GC_push_other_roots)() = 0;
! 1354: #else /* THREADS */
! 1355:
! 1356: # ifdef PCR
! 1357: PCR_ERes GC_push_thread_stack(PCR_Th_T *t, PCR_Any dummy)
! 1358: {
! 1359: struct PCR_ThCtl_TInfoRep info;
! 1360: PCR_ERes result;
! 1361:
! 1362: info.ti_stkLow = info.ti_stkHi = 0;
! 1363: result = PCR_ThCtl_GetInfo(t, &info);
! 1364: GC_push_all_stack((ptr_t)(info.ti_stkLow), (ptr_t)(info.ti_stkHi));
! 1365: return(result);
! 1366: }
! 1367:
! 1368: /* Push the contents of an old object. We treat this as stack */
! 1369: /* data only becasue that makes it robust against mark stack */
! 1370: /* overflow. */
! 1371: PCR_ERes GC_push_old_obj(void *p, size_t size, PCR_Any data)
! 1372: {
! 1373: GC_push_all_stack((ptr_t)p, (ptr_t)p + size);
! 1374: return(PCR_ERes_okay);
! 1375: }
! 1376:
! 1377:
! 1378: void GC_default_push_other_roots()
! 1379: {
! 1380: /* Traverse data allocated by previous memory managers. */
! 1381: {
! 1382: extern struct PCR_MM_ProcsRep * GC_old_allocator;
! 1383:
! 1384: if ((*(GC_old_allocator->mmp_enumerate))(PCR_Bool_false,
! 1385: GC_push_old_obj, 0)
! 1386: != PCR_ERes_okay) {
! 1387: ABORT("Old object enumeration failed");
! 1388: }
! 1389: }
! 1390: /* Traverse all thread stacks. */
! 1391: if (PCR_ERes_IsErr(
! 1392: PCR_ThCtl_ApplyToAllOtherThreads(GC_push_thread_stack,0))
! 1393: || PCR_ERes_IsErr(GC_push_thread_stack(PCR_Th_CurrThread(), 0))) {
! 1394: ABORT("Thread stack marking failed\n");
! 1395: }
! 1396: }
! 1397:
! 1398: # endif /* PCR */
! 1399:
! 1400: # ifdef SRC_M3
! 1401:
! 1402: # ifdef ALL_INTERIOR_POINTERS
! 1403: --> misconfigured
! 1404: # endif
! 1405:
! 1406:
! 1407: extern void ThreadF__ProcessStacks();
! 1408:
! 1409: void GC_push_thread_stack(start, stop)
! 1410: word start, stop;
! 1411: {
! 1412: GC_push_all_stack((ptr_t)start, (ptr_t)stop + sizeof(word));
! 1413: }
! 1414:
! 1415: /* Push routine with M3 specific calling convention. */
! 1416: GC_m3_push_root(dummy1, p, dummy2, dummy3)
! 1417: word *p;
! 1418: ptr_t dummy1, dummy2;
! 1419: int dummy3;
! 1420: {
! 1421: word q = *p;
! 1422:
! 1423: if ((ptr_t)(q) >= GC_least_plausible_heap_addr
! 1424: && (ptr_t)(q) < GC_greatest_plausible_heap_addr) {
! 1425: GC_push_one_checked(q,FALSE);
! 1426: }
! 1427: }
! 1428:
! 1429: /* M3 set equivalent to RTHeap.TracedRefTypes */
! 1430: typedef struct { int elts[1]; } RefTypeSet;
! 1431: RefTypeSet GC_TracedRefTypes = {{0x1}};
! 1432:
! 1433: /* From finalize.c */
! 1434: extern void GC_push_finalizer_structures();
! 1435:
! 1436: /* From stubborn.c: */
! 1437: # ifdef STUBBORN_ALLOC
! 1438: extern GC_PTR * GC_changing_list_start;
! 1439: # endif
! 1440:
! 1441:
! 1442: void GC_default_push_other_roots()
! 1443: {
! 1444: /* Use the M3 provided routine for finding static roots. */
! 1445: /* This is a bit dubious, since it presumes no C roots. */
! 1446: /* We handle the collector roots explicitly. */
! 1447: {
! 1448: # ifdef STUBBORN_ALLOC
! 1449: GC_push_one(GC_changing_list_start);
! 1450: # endif
! 1451: GC_push_finalizer_structures();
! 1452: RTMain__GlobalMapProc(GC_m3_push_root, 0, GC_TracedRefTypes);
! 1453: }
! 1454: if (GC_words_allocd > 0) {
! 1455: ThreadF__ProcessStacks(GC_push_thread_stack);
! 1456: }
! 1457: /* Otherwise this isn't absolutely necessary, and we have */
! 1458: /* startup ordering problems. */
! 1459: }
! 1460:
! 1461: # endif /* SRC_M3 */
! 1462:
! 1463: # if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
! 1464: || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
! 1465: || defined(IRIX_PCR_THREADS)
! 1466:
! 1467: extern void GC_push_all_stacks();
! 1468:
! 1469: void GC_default_push_other_roots()
! 1470: {
! 1471: GC_push_all_stacks();
! 1472: }
! 1473:
! 1474: # endif /* SOLARIS_THREADS || ... */
! 1475:
! 1476: void (*GC_push_other_roots)() = GC_default_push_other_roots;
! 1477:
! 1478: #endif
! 1479:
! 1480: /*
! 1481: * Routines for accessing dirty bits on virtual pages.
! 1482: * We plan to eventaually implement four strategies for doing so:
! 1483: * DEFAULT_VDB: A simple dummy implementation that treats every page
! 1484: * as possibly dirty. This makes incremental collection
! 1485: * useless, but the implementation is still correct.
! 1486: * PCR_VDB: Use PPCRs virtual dirty bit facility.
! 1487: * PROC_VDB: Use the /proc facility for reading dirty bits. Only
! 1488: * works under some SVR4 variants. Even then, it may be
! 1489: * too slow to be entirely satisfactory. Requires reading
! 1490: * dirty bits for entire address space. Implementations tend
! 1491: * to assume that the client is a (slow) debugger.
! 1492: * MPROTECT_VDB:Protect pages and then catch the faults to keep track of
! 1493: * dirtied pages. The implementation (and implementability)
! 1494: * is highly system dependent. This usually fails when system
! 1495: * calls write to a protected page. We prevent the read system
! 1496: * call from doing so. It is the clients responsibility to
! 1497: * make sure that other system calls are similarly protected
! 1498: * or write only to the stack.
! 1499: */
! 1500:
! 1501: GC_bool GC_dirty_maintained = FALSE;
! 1502:
! 1503: # ifdef DEFAULT_VDB
! 1504:
! 1505: /* All of the following assume the allocation lock is held, and */
! 1506: /* signals are disabled. */
! 1507:
! 1508: /* The client asserts that unallocated pages in the heap are never */
! 1509: /* written. */
! 1510:
! 1511: /* Initialize virtual dirty bit implementation. */
! 1512: void GC_dirty_init()
! 1513: {
! 1514: GC_dirty_maintained = TRUE;
! 1515: }
! 1516:
! 1517: /* Retrieve system dirty bits for heap to a local buffer. */
! 1518: /* Restore the systems notion of which pages are dirty. */
! 1519: void GC_read_dirty()
! 1520: {}
! 1521:
! 1522: /* Is the HBLKSIZE sized page at h marked dirty in the local buffer? */
! 1523: /* If the actual page size is different, this returns TRUE if any */
! 1524: /* of the pages overlapping h are dirty. This routine may err on the */
! 1525: /* side of labelling pages as dirty (and this implementation does). */
! 1526: /*ARGSUSED*/
! 1527: GC_bool GC_page_was_dirty(h)
! 1528: struct hblk *h;
! 1529: {
! 1530: return(TRUE);
! 1531: }
! 1532:
! 1533: /*
! 1534: * The following two routines are typically less crucial. They matter
! 1535: * most with large dynamic libraries, or if we can't accurately identify
! 1536: * stacks, e.g. under Solaris 2.X. Otherwise the following default
! 1537: * versions are adequate.
! 1538: */
! 1539:
! 1540: /* Could any valid GC heap pointer ever have been written to this page? */
! 1541: /*ARGSUSED*/
! 1542: GC_bool GC_page_was_ever_dirty(h)
! 1543: struct hblk *h;
! 1544: {
! 1545: return(TRUE);
! 1546: }
! 1547:
! 1548: /* Reset the n pages starting at h to "was never dirty" status. */
! 1549: void GC_is_fresh(h, n)
! 1550: struct hblk *h;
! 1551: word n;
! 1552: {
! 1553: }
! 1554:
! 1555: /* A call hints that h is about to be written. */
! 1556: /* May speed up some dirty bit implementations. */
! 1557: /*ARGSUSED*/
! 1558: void GC_write_hint(h)
! 1559: struct hblk *h;
! 1560: {
! 1561: }
! 1562:
! 1563: # endif /* DEFAULT_VDB */
! 1564:
! 1565:
! 1566: # ifdef MPROTECT_VDB
! 1567:
! 1568: /*
! 1569: * See DEFAULT_VDB for interface descriptions.
! 1570: */
! 1571:
! 1572: /*
! 1573: * This implementation maintains dirty bits itself by catching write
! 1574: * faults and keeping track of them. We assume nobody else catches
! 1575: * SIGBUS or SIGSEGV. We assume no write faults occur in system calls
! 1576: * except as a result of a read system call. This means clients must
! 1577: * either ensure that system calls do not touch the heap, or must
! 1578: * provide their own wrappers analogous to the one for read.
! 1579: * We assume the page size is a multiple of HBLKSIZE.
! 1580: * This implementation is currently SunOS 4.X and IRIX 5.X specific, though we
! 1581: * tried to use portable code where easily possible. It is known
! 1582: * not to work under a number of other systems.
! 1583: */
! 1584:
! 1585: # ifndef MSWIN32
! 1586:
! 1587: # include <sys/mman.h>
! 1588: # include <signal.h>
! 1589: # include <sys/syscall.h>
! 1590:
! 1591: # define PROTECT(addr, len) \
! 1592: if (mprotect((caddr_t)(addr), (int)(len), \
! 1593: PROT_READ | OPT_PROT_EXEC) < 0) { \
! 1594: ABORT("mprotect failed"); \
! 1595: }
! 1596: # define UNPROTECT(addr, len) \
! 1597: if (mprotect((caddr_t)(addr), (int)(len), \
! 1598: PROT_WRITE | PROT_READ | OPT_PROT_EXEC ) < 0) { \
! 1599: ABORT("un-mprotect failed"); \
! 1600: }
! 1601:
! 1602: # else
! 1603:
! 1604: # include <signal.h>
! 1605:
! 1606: static DWORD protect_junk;
! 1607: # define PROTECT(addr, len) \
! 1608: if (!VirtualProtect((addr), (len), PAGE_EXECUTE_READ, \
! 1609: &protect_junk)) { \
! 1610: DWORD last_error = GetLastError(); \
! 1611: GC_printf1("Last error code: %lx\n", last_error); \
! 1612: ABORT("VirtualProtect failed"); \
! 1613: }
! 1614: # define UNPROTECT(addr, len) \
! 1615: if (!VirtualProtect((addr), (len), PAGE_EXECUTE_READWRITE, \
! 1616: &protect_junk)) { \
! 1617: ABORT("un-VirtualProtect failed"); \
! 1618: }
! 1619:
! 1620: # endif
! 1621:
! 1622: #if defined(SUNOS4) || defined(FREEBSD)
! 1623: typedef void (* SIG_PF)();
! 1624: #endif
! 1625: #if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX)
! 1626: typedef void (* SIG_PF)(int);
! 1627: #endif
! 1628: #if defined(MSWIN32)
! 1629: typedef LPTOP_LEVEL_EXCEPTION_FILTER SIG_PF;
! 1630: # undef SIG_DFL
! 1631: # define SIG_DFL (LPTOP_LEVEL_EXCEPTION_FILTER) (-1)
! 1632: #endif
! 1633:
! 1634: #if defined(IRIX5) || defined(OSF1)
! 1635: typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *);
! 1636: #endif
! 1637: #if defined(SUNOS5SIGS)
! 1638: typedef void (* REAL_SIG_PF)(int, struct siginfo *, void *);
! 1639: #endif
! 1640: #if defined(LINUX)
! 1641: # include <linux/version.h>
! 1642: # if (LINUX_VERSION_CODE >= 0x20100) && !defined(M68K) || defined(ALPHA)
! 1643: typedef struct sigcontext s_c;
! 1644: # else
! 1645: typedef struct sigcontext_struct s_c;
! 1646: # endif
! 1647: # ifdef ALPHA
! 1648: typedef void (* REAL_SIG_PF)(int, int, s_c *);
! 1649: /* Retrieve fault address from sigcontext structure by decoding */
! 1650: /* instruction. */
! 1651: char * get_fault_addr(s_c *sc) {
! 1652: unsigned instr;
! 1653: word faultaddr;
! 1654:
! 1655: instr = *((unsigned *)(sc->sc_pc));
! 1656: faultaddr = sc->sc_regs[(instr >> 16) & 0x1f];
! 1657: faultaddr += (word) (((int)instr << 16) >> 16);
! 1658: return (char *)faultaddr;
! 1659: }
! 1660: # else /* !ALPHA */
! 1661: typedef void (* REAL_SIG_PF)(int, s_c);
! 1662: # endif /* !ALPHA */
! 1663: # endif
! 1664:
! 1665: SIG_PF GC_old_bus_handler;
! 1666: SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */
! 1667:
! 1668: /*ARGSUSED*/
! 1669: # if defined (SUNOS4) || defined(FREEBSD)
! 1670: void GC_write_fault_handler(sig, code, scp, addr)
! 1671: int sig, code;
! 1672: struct sigcontext *scp;
! 1673: char * addr;
! 1674: # ifdef SUNOS4
! 1675: # define SIG_OK (sig == SIGSEGV || sig == SIGBUS)
! 1676: # define CODE_OK (FC_CODE(code) == FC_PROT \
! 1677: || (FC_CODE(code) == FC_OBJERR \
! 1678: && FC_ERRNO(code) == FC_PROT))
! 1679: # endif
! 1680: # ifdef FREEBSD
! 1681: # define SIG_OK (sig == SIGBUS)
! 1682: # define CODE_OK (code == BUS_PAGE_FAULT)
! 1683: # endif
! 1684: # endif
! 1685: # if defined(IRIX5) || defined(OSF1)
! 1686: # include <errno.h>
! 1687: void GC_write_fault_handler(int sig, int code, struct sigcontext *scp)
! 1688: # define SIG_OK (sig == SIGSEGV)
! 1689: # ifdef OSF1
! 1690: # define CODE_OK (code == 2 /* experimentally determined */)
! 1691: # endif
! 1692: # ifdef IRIX5
! 1693: # define CODE_OK (code == EACCES)
! 1694: # endif
! 1695: # endif
! 1696: # if defined(LINUX)
! 1697: # ifdef ALPHA
! 1698: void GC_write_fault_handler(int sig, int code, s_c * sc)
! 1699: # else
! 1700: void GC_write_fault_handler(int sig, s_c sc)
! 1701: # endif
! 1702: # define SIG_OK (sig == SIGSEGV)
! 1703: # define CODE_OK TRUE
! 1704: /* Empirically c.trapno == 14, but is that useful? */
! 1705: /* We assume Intel architecture, so alignment */
! 1706: /* faults are not possible. */
! 1707: # endif
! 1708: # if defined(SUNOS5SIGS)
! 1709: void GC_write_fault_handler(int sig, struct siginfo *scp, void * context)
! 1710: # define SIG_OK (sig == SIGSEGV)
! 1711: # define CODE_OK (scp -> si_code == SEGV_ACCERR)
! 1712: # endif
! 1713: # if defined(MSWIN32)
! 1714: LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info)
! 1715: # define SIG_OK (exc_info -> ExceptionRecord -> ExceptionCode == \
! 1716: EXCEPTION_ACCESS_VIOLATION)
! 1717: # define CODE_OK (exc_info -> ExceptionRecord -> ExceptionInformation[0] == 1)
! 1718: /* Write fault */
! 1719: # endif
! 1720: {
! 1721: register unsigned i;
! 1722: # ifdef IRIX5
! 1723: char * addr = (char *) (size_t) (scp -> sc_badvaddr);
! 1724: # endif
! 1725: # if defined(OSF1) && defined(ALPHA)
! 1726: char * addr = (char *) (scp -> sc_traparg_a0);
! 1727: # endif
! 1728: # ifdef SUNOS5SIGS
! 1729: char * addr = (char *) (scp -> si_addr);
! 1730: # endif
! 1731: # ifdef LINUX
! 1732: # ifdef I386
! 1733: char * addr = (char *) (sc.cr2);
! 1734: # else
! 1735: # if defined(M68K)
! 1736: char * addr = NULL;
! 1737:
! 1738: struct sigcontext *scp = (struct sigcontext *)(&sc);
! 1739:
! 1740: int format = (scp->sc_formatvec >> 12) & 0xf;
! 1741: unsigned long *framedata = (unsigned long *)(scp + 1);
! 1742: unsigned long ea;
! 1743:
! 1744: if (format == 0xa || format == 0xb) {
! 1745: /* 68020/030 */
! 1746: ea = framedata[2];
! 1747: } else if (format == 7) {
! 1748: /* 68040 */
! 1749: ea = framedata[3];
! 1750: } else if (format == 4) {
! 1751: /* 68060 */
! 1752: ea = framedata[0];
! 1753: if (framedata[1] & 0x08000000) {
! 1754: /* correct addr on misaligned access */
! 1755: ea = (ea+4095)&(~4095);
! 1756: }
! 1757: }
! 1758: addr = (char *)ea;
! 1759: # else
! 1760: # ifdef ALPHA
! 1761: char * addr = get_fault_addr(sc);
! 1762: # else
! 1763: --> architecture not supported
! 1764: # endif
! 1765: # endif
! 1766: # endif
! 1767: # endif
! 1768: # if defined(MSWIN32)
! 1769: char * addr = (char *) (exc_info -> ExceptionRecord
! 1770: -> ExceptionInformation[1]);
! 1771: # define sig SIGSEGV
! 1772: # endif
! 1773:
! 1774: if (SIG_OK && CODE_OK) {
! 1775: register struct hblk * h =
! 1776: (struct hblk *)((word)addr & ~(GC_page_size-1));
! 1777: GC_bool in_allocd_block;
! 1778:
! 1779: # ifdef SUNOS5SIGS
! 1780: /* Address is only within the correct physical page. */
! 1781: in_allocd_block = FALSE;
! 1782: for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
! 1783: if (HDR(h+i) != 0) {
! 1784: in_allocd_block = TRUE;
! 1785: }
! 1786: }
! 1787: # else
! 1788: in_allocd_block = (HDR(addr) != 0);
! 1789: # endif
! 1790: if (!in_allocd_block) {
! 1791: /* Heap blocks now begin and end on page boundaries */
! 1792: SIG_PF old_handler;
! 1793:
! 1794: if (sig == SIGSEGV) {
! 1795: old_handler = GC_old_segv_handler;
! 1796: } else {
! 1797: old_handler = GC_old_bus_handler;
! 1798: }
! 1799: if (old_handler == SIG_DFL) {
! 1800: # ifndef MSWIN32
! 1801: GC_err_printf1("Segfault at 0x%lx\n", addr);
! 1802: ABORT("Unexpected bus error or segmentation fault");
! 1803: # else
! 1804: return(EXCEPTION_CONTINUE_SEARCH);
! 1805: # endif
! 1806: } else {
! 1807: # if defined (SUNOS4) || defined(FREEBSD)
! 1808: (*old_handler) (sig, code, scp, addr);
! 1809: return;
! 1810: # endif
! 1811: # if defined (SUNOS5SIGS)
! 1812: (*(REAL_SIG_PF)old_handler) (sig, scp, context);
! 1813: return;
! 1814: # endif
! 1815: # if defined (LINUX)
! 1816: # ifdef ALPHA
! 1817: (*(REAL_SIG_PF)old_handler) (sig, code, sc);
! 1818: # else
! 1819: (*(REAL_SIG_PF)old_handler) (sig, sc);
! 1820: # endif
! 1821: return;
! 1822: # endif
! 1823: # if defined (IRIX5) || defined(OSF1)
! 1824: (*(REAL_SIG_PF)old_handler) (sig, code, scp);
! 1825: return;
! 1826: # endif
! 1827: # ifdef MSWIN32
! 1828: return((*old_handler)(exc_info));
! 1829: # endif
! 1830: }
! 1831: }
! 1832: for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
! 1833: register int index = PHT_HASH(h+i);
! 1834:
! 1835: set_pht_entry_from_index(GC_dirty_pages, index);
! 1836: }
! 1837: UNPROTECT(h, GC_page_size);
! 1838: # if defined(OSF1) || defined(LINUX)
! 1839: /* These reset the signal handler each time by default. */
! 1840: signal(SIGSEGV, (SIG_PF) GC_write_fault_handler);
! 1841: # endif
! 1842: /* The write may not take place before dirty bits are read. */
! 1843: /* But then we'll fault again ... */
! 1844: # ifdef MSWIN32
! 1845: return(EXCEPTION_CONTINUE_EXECUTION);
! 1846: # else
! 1847: return;
! 1848: # endif
! 1849: }
! 1850: #ifdef MSWIN32
! 1851: return EXCEPTION_CONTINUE_SEARCH;
! 1852: #else
! 1853: GC_err_printf1("Segfault at 0x%lx\n", addr);
! 1854: ABORT("Unexpected bus error or segmentation fault");
! 1855: #endif
! 1856: }
! 1857:
! 1858: /*
! 1859: * We hold the allocation lock. We expect block h to be written
! 1860: * shortly.
! 1861: */
! 1862: void GC_write_hint(h)
! 1863: struct hblk *h;
! 1864: {
! 1865: register struct hblk * h_trunc;
! 1866: register unsigned i;
! 1867: register GC_bool found_clean;
! 1868:
! 1869: if (!GC_dirty_maintained) return;
! 1870: h_trunc = (struct hblk *)((word)h & ~(GC_page_size-1));
! 1871: found_clean = FALSE;
! 1872: for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
! 1873: register int index = PHT_HASH(h_trunc+i);
! 1874:
! 1875: if (!get_pht_entry_from_index(GC_dirty_pages, index)) {
! 1876: found_clean = TRUE;
! 1877: set_pht_entry_from_index(GC_dirty_pages, index);
! 1878: }
! 1879: }
! 1880: if (found_clean) {
! 1881: UNPROTECT(h_trunc, GC_page_size);
! 1882: }
! 1883: }
! 1884:
! 1885: void GC_dirty_init()
! 1886: {
! 1887: #if defined(SUNOS5SIGS) || defined(IRIX5) /* || defined(OSF1) */
! 1888: struct sigaction act, oldact;
! 1889: # ifdef IRIX5
! 1890: act.sa_flags = SA_RESTART;
! 1891: act.sa_handler = GC_write_fault_handler;
! 1892: # else
! 1893: act.sa_flags = SA_RESTART | SA_SIGINFO;
! 1894: act.sa_sigaction = GC_write_fault_handler;
! 1895: # endif
! 1896: (void)sigemptyset(&act.sa_mask);
! 1897: #endif
! 1898: # ifdef PRINTSTATS
! 1899: GC_printf0("Inititalizing mprotect virtual dirty bit implementation\n");
! 1900: # endif
! 1901: GC_dirty_maintained = TRUE;
! 1902: if (GC_page_size % HBLKSIZE != 0) {
! 1903: GC_err_printf0("Page size not multiple of HBLKSIZE\n");
! 1904: ABORT("Page size not multiple of HBLKSIZE");
! 1905: }
! 1906: # if defined(SUNOS4) || defined(FREEBSD)
! 1907: GC_old_bus_handler = signal(SIGBUS, GC_write_fault_handler);
! 1908: if (GC_old_bus_handler == SIG_IGN) {
! 1909: GC_err_printf0("Previously ignored bus error!?");
! 1910: GC_old_bus_handler = SIG_DFL;
! 1911: }
! 1912: if (GC_old_bus_handler != SIG_DFL) {
! 1913: # ifdef PRINTSTATS
! 1914: GC_err_printf0("Replaced other SIGBUS handler\n");
! 1915: # endif
! 1916: }
! 1917: # endif
! 1918: # if defined(OSF1) || defined(SUNOS4) || defined(LINUX)
! 1919: GC_old_segv_handler = signal(SIGSEGV, (SIG_PF)GC_write_fault_handler);
! 1920: if (GC_old_segv_handler == SIG_IGN) {
! 1921: GC_err_printf0("Previously ignored segmentation violation!?");
! 1922: GC_old_segv_handler = SIG_DFL;
! 1923: }
! 1924: if (GC_old_segv_handler != SIG_DFL) {
! 1925: # ifdef PRINTSTATS
! 1926: GC_err_printf0("Replaced other SIGSEGV handler\n");
! 1927: # endif
! 1928: }
! 1929: # endif
! 1930: # if defined(SUNOS5SIGS) || defined(IRIX5)
! 1931: # if defined(IRIX_THREADS) || defined(IRIX_PCR_THREADS)
! 1932: sigaction(SIGSEGV, 0, &oldact);
! 1933: sigaction(SIGSEGV, &act, 0);
! 1934: # else
! 1935: sigaction(SIGSEGV, &act, &oldact);
! 1936: # endif
! 1937: # if defined(_sigargs)
! 1938: /* This is Irix 5.x, not 6.x. Irix 5.x does not have */
! 1939: /* sa_sigaction. */
! 1940: GC_old_segv_handler = oldact.sa_handler;
! 1941: # else /* Irix 6.x or SUNOS5SIGS */
! 1942: if (oldact.sa_flags & SA_SIGINFO) {
! 1943: GC_old_segv_handler = (SIG_PF)(oldact.sa_sigaction);
! 1944: } else {
! 1945: GC_old_segv_handler = oldact.sa_handler;
! 1946: }
! 1947: # endif
! 1948: if (GC_old_segv_handler == SIG_IGN) {
! 1949: GC_err_printf0("Previously ignored segmentation violation!?");
! 1950: GC_old_segv_handler = SIG_DFL;
! 1951: }
! 1952: if (GC_old_segv_handler != SIG_DFL) {
! 1953: # ifdef PRINTSTATS
! 1954: GC_err_printf0("Replaced other SIGSEGV handler\n");
! 1955: # endif
! 1956: }
! 1957: # endif
! 1958: # if defined(MSWIN32)
! 1959: GC_old_segv_handler = SetUnhandledExceptionFilter(GC_write_fault_handler);
! 1960: if (GC_old_segv_handler != NULL) {
! 1961: # ifdef PRINTSTATS
! 1962: GC_err_printf0("Replaced other UnhandledExceptionFilter\n");
! 1963: # endif
! 1964: } else {
! 1965: GC_old_segv_handler = SIG_DFL;
! 1966: }
! 1967: # endif
! 1968: }
! 1969:
! 1970:
! 1971:
! 1972: void GC_protect_heap()
! 1973: {
! 1974: ptr_t start;
! 1975: word len;
! 1976: unsigned i;
! 1977:
! 1978: for (i = 0; i < GC_n_heap_sects; i++) {
! 1979: start = GC_heap_sects[i].hs_start;
! 1980: len = GC_heap_sects[i].hs_bytes;
! 1981: PROTECT(start, len);
! 1982: }
! 1983: }
! 1984:
! 1985: /* We assume that either the world is stopped or its OK to lose dirty */
! 1986: /* bits while this is happenning (as in GC_enable_incremental). */
! 1987: void GC_read_dirty()
! 1988: {
! 1989: BCOPY((word *)GC_dirty_pages, GC_grungy_pages,
! 1990: (sizeof GC_dirty_pages));
! 1991: BZERO((word *)GC_dirty_pages, (sizeof GC_dirty_pages));
! 1992: GC_protect_heap();
! 1993: }
! 1994:
! 1995: GC_bool GC_page_was_dirty(h)
! 1996: struct hblk * h;
! 1997: {
! 1998: register word index = PHT_HASH(h);
! 1999:
! 2000: return(HDR(h) == 0 || get_pht_entry_from_index(GC_grungy_pages, index));
! 2001: }
! 2002:
! 2003: /*
! 2004: * Acquiring the allocation lock here is dangerous, since this
! 2005: * can be called from within GC_call_with_alloc_lock, and the cord
! 2006: * package does so. On systems that allow nested lock acquisition, this
! 2007: * happens to work.
! 2008: * On other systems, SET_LOCK_HOLDER and friends must be suitably defined.
! 2009: */
! 2010:
! 2011: void GC_begin_syscall()
! 2012: {
! 2013: if (!I_HOLD_LOCK()) LOCK();
! 2014: }
! 2015:
! 2016: void GC_end_syscall()
! 2017: {
! 2018: if (!I_HOLD_LOCK()) UNLOCK();
! 2019: }
! 2020:
! 2021: void GC_unprotect_range(addr, len)
! 2022: ptr_t addr;
! 2023: word len;
! 2024: {
! 2025: struct hblk * start_block;
! 2026: struct hblk * end_block;
! 2027: register struct hblk *h;
! 2028: ptr_t obj_start;
! 2029:
! 2030: if (!GC_incremental) return;
! 2031: obj_start = GC_base(addr);
! 2032: if (obj_start == 0) return;
! 2033: if (GC_base(addr + len - 1) != obj_start) {
! 2034: ABORT("GC_unprotect_range(range bigger than object)");
! 2035: }
! 2036: start_block = (struct hblk *)((word)addr & ~(GC_page_size - 1));
! 2037: end_block = (struct hblk *)((word)(addr + len - 1) & ~(GC_page_size - 1));
! 2038: end_block += GC_page_size/HBLKSIZE - 1;
! 2039: for (h = start_block; h <= end_block; h++) {
! 2040: register word index = PHT_HASH(h);
! 2041:
! 2042: set_pht_entry_from_index(GC_dirty_pages, index);
! 2043: }
! 2044: UNPROTECT(start_block,
! 2045: ((ptr_t)end_block - (ptr_t)start_block) + HBLKSIZE);
! 2046: }
! 2047:
! 2048: #ifndef MSWIN32
! 2049: /* Replacement for UNIX system call. */
! 2050: /* Other calls that write to the heap */
! 2051: /* should be handled similarly. */
! 2052: # if defined(__STDC__) && !defined(SUNOS4)
! 2053: # include <unistd.h>
! 2054: ssize_t read(int fd, void *buf, size_t nbyte)
! 2055: # else
! 2056: # ifndef LINT
! 2057: int read(fd, buf, nbyte)
! 2058: # else
! 2059: int GC_read(fd, buf, nbyte)
! 2060: # endif
! 2061: int fd;
! 2062: char *buf;
! 2063: int nbyte;
! 2064: # endif
! 2065: {
! 2066: int result;
! 2067:
! 2068: GC_begin_syscall();
! 2069: GC_unprotect_range(buf, (word)nbyte);
! 2070: # ifdef IRIX5
! 2071: /* Indirect system call may not always be easily available. */
! 2072: /* We could call _read, but that would interfere with the */
! 2073: /* libpthread interception of read. */
! 2074: {
! 2075: struct iovec iov;
! 2076:
! 2077: iov.iov_base = buf;
! 2078: iov.iov_len = nbyte;
! 2079: result = readv(fd, &iov, 1);
! 2080: }
! 2081: # else
! 2082: result = syscall(SYS_read, fd, buf, nbyte);
! 2083: # endif
! 2084: GC_end_syscall();
! 2085: return(result);
! 2086: }
! 2087: #endif /* !MSWIN32 */
! 2088:
! 2089: /*ARGSUSED*/
! 2090: GC_bool GC_page_was_ever_dirty(h)
! 2091: struct hblk *h;
! 2092: {
! 2093: return(TRUE);
! 2094: }
! 2095:
! 2096: /* Reset the n pages starting at h to "was never dirty" status. */
! 2097: /*ARGSUSED*/
! 2098: void GC_is_fresh(h, n)
! 2099: struct hblk *h;
! 2100: word n;
! 2101: {
! 2102: }
! 2103:
! 2104: # endif /* MPROTECT_VDB */
! 2105:
! 2106: # ifdef PROC_VDB
! 2107:
! 2108: /*
! 2109: * See DEFAULT_VDB for interface descriptions.
! 2110: */
! 2111:
! 2112: /*
! 2113: * This implementaion assumes a Solaris 2.X like /proc pseudo-file-system
! 2114: * from which we can read page modified bits. This facility is far from
! 2115: * optimal (e.g. we would like to get the info for only some of the
! 2116: * address space), but it avoids intercepting system calls.
! 2117: */
! 2118:
! 2119: #include <errno.h>
! 2120: #include <sys/types.h>
! 2121: #include <sys/signal.h>
! 2122: #include <sys/fault.h>
! 2123: #include <sys/syscall.h>
! 2124: #include <sys/procfs.h>
! 2125: #include <sys/stat.h>
! 2126: #include <fcntl.h>
! 2127:
! 2128: #define INITIAL_BUF_SZ 4096
! 2129: word GC_proc_buf_size = INITIAL_BUF_SZ;
! 2130: char *GC_proc_buf;
! 2131:
! 2132: #ifdef SOLARIS_THREADS
! 2133: /* We don't have exact sp values for threads. So we count on */
! 2134: /* occasionally declaring stack pages to be fresh. Thus we */
! 2135: /* need a real implementation of GC_is_fresh. We can't clear */
! 2136: /* entries in GC_written_pages, since that would declare all */
! 2137: /* pages with the given hash address to be fresh. */
! 2138: # define MAX_FRESH_PAGES 8*1024 /* Must be power of 2 */
! 2139: struct hblk ** GC_fresh_pages; /* A direct mapped cache. */
! 2140: /* Collisions are dropped. */
! 2141:
! 2142: # define FRESH_PAGE_SLOT(h) (divHBLKSZ((word)(h)) & (MAX_FRESH_PAGES-1))
! 2143: # define ADD_FRESH_PAGE(h) \
! 2144: GC_fresh_pages[FRESH_PAGE_SLOT(h)] = (h)
! 2145: # define PAGE_IS_FRESH(h) \
! 2146: (GC_fresh_pages[FRESH_PAGE_SLOT(h)] == (h) && (h) != 0)
! 2147: #endif
! 2148:
! 2149: /* Add all pages in pht2 to pht1 */
! 2150: void GC_or_pages(pht1, pht2)
! 2151: page_hash_table pht1, pht2;
! 2152: {
! 2153: register int i;
! 2154:
! 2155: for (i = 0; i < PHT_SIZE; i++) pht1[i] |= pht2[i];
! 2156: }
! 2157:
! 2158: int GC_proc_fd;
! 2159:
! 2160: void GC_dirty_init()
! 2161: {
! 2162: int fd;
! 2163: char buf[30];
! 2164:
! 2165: GC_dirty_maintained = TRUE;
! 2166: if (GC_words_allocd != 0 || GC_words_allocd_before_gc != 0) {
! 2167: register int i;
! 2168:
! 2169: for (i = 0; i < PHT_SIZE; i++) GC_written_pages[i] = (word)(-1);
! 2170: # ifdef PRINTSTATS
! 2171: GC_printf1("Allocated words:%lu:all pages may have been written\n",
! 2172: (unsigned long)
! 2173: (GC_words_allocd + GC_words_allocd_before_gc));
! 2174: # endif
! 2175: }
! 2176: sprintf(buf, "/proc/%d", getpid());
! 2177: fd = open(buf, O_RDONLY);
! 2178: if (fd < 0) {
! 2179: ABORT("/proc open failed");
! 2180: }
! 2181: GC_proc_fd = syscall(SYS_ioctl, fd, PIOCOPENPD, 0);
! 2182: close(fd);
! 2183: if (GC_proc_fd < 0) {
! 2184: ABORT("/proc ioctl failed");
! 2185: }
! 2186: GC_proc_buf = GC_scratch_alloc(GC_proc_buf_size);
! 2187: # ifdef SOLARIS_THREADS
! 2188: GC_fresh_pages = (struct hblk **)
! 2189: GC_scratch_alloc(MAX_FRESH_PAGES * sizeof (struct hblk *));
! 2190: if (GC_fresh_pages == 0) {
! 2191: GC_err_printf0("No space for fresh pages\n");
! 2192: EXIT();
! 2193: }
! 2194: BZERO(GC_fresh_pages, MAX_FRESH_PAGES * sizeof (struct hblk *));
! 2195: # endif
! 2196: }
! 2197:
! 2198: /* Ignore write hints. They don't help us here. */
! 2199: /*ARGSUSED*/
! 2200: void GC_write_hint(h)
! 2201: struct hblk *h;
! 2202: {
! 2203: }
! 2204:
! 2205: #ifdef SOLARIS_THREADS
! 2206: # define READ(fd,buf,nbytes) syscall(SYS_read, fd, buf, nbytes)
! 2207: #else
! 2208: # define READ(fd,buf,nbytes) read(fd, buf, nbytes)
! 2209: #endif
! 2210:
! 2211: void GC_read_dirty()
! 2212: {
! 2213: unsigned long ps, np;
! 2214: int nmaps;
! 2215: ptr_t vaddr;
! 2216: struct prasmap * map;
! 2217: char * bufp;
! 2218: ptr_t current_addr, limit;
! 2219: int i;
! 2220: int dummy;
! 2221:
! 2222: BZERO(GC_grungy_pages, (sizeof GC_grungy_pages));
! 2223:
! 2224: bufp = GC_proc_buf;
! 2225: if (READ(GC_proc_fd, bufp, GC_proc_buf_size) <= 0) {
! 2226: # ifdef PRINTSTATS
! 2227: GC_printf1("/proc read failed: GC_proc_buf_size = %lu\n",
! 2228: GC_proc_buf_size);
! 2229: # endif
! 2230: {
! 2231: /* Retry with larger buffer. */
! 2232: word new_size = 2 * GC_proc_buf_size;
! 2233: char * new_buf = GC_scratch_alloc(new_size);
! 2234:
! 2235: if (new_buf != 0) {
! 2236: GC_proc_buf = bufp = new_buf;
! 2237: GC_proc_buf_size = new_size;
! 2238: }
! 2239: if (syscall(SYS_read, GC_proc_fd, bufp, GC_proc_buf_size) <= 0) {
! 2240: WARN("Insufficient space for /proc read\n", 0);
! 2241: /* Punt: */
! 2242: memset(GC_grungy_pages, 0xff, sizeof (page_hash_table));
! 2243: memset(GC_written_pages, 0xff, sizeof(page_hash_table));
! 2244: # ifdef SOLARIS_THREADS
! 2245: BZERO(GC_fresh_pages,
! 2246: MAX_FRESH_PAGES * sizeof (struct hblk *));
! 2247: # endif
! 2248: return;
! 2249: }
! 2250: }
! 2251: }
! 2252: /* Copy dirty bits into GC_grungy_pages */
! 2253: nmaps = ((struct prpageheader *)bufp) -> pr_nmap;
! 2254: /* printf( "nmaps = %d, PG_REFERENCED = %d, PG_MODIFIED = %d\n",
! 2255: nmaps, PG_REFERENCED, PG_MODIFIED); */
! 2256: bufp = bufp + sizeof(struct prpageheader);
! 2257: for (i = 0; i < nmaps; i++) {
! 2258: map = (struct prasmap *)bufp;
! 2259: vaddr = (ptr_t)(map -> pr_vaddr);
! 2260: ps = map -> pr_pagesize;
! 2261: np = map -> pr_npage;
! 2262: /* printf("vaddr = 0x%X, ps = 0x%X, np = 0x%X\n", vaddr, ps, np); */
! 2263: limit = vaddr + ps * np;
! 2264: bufp += sizeof (struct prasmap);
! 2265: for (current_addr = vaddr;
! 2266: current_addr < limit; current_addr += ps){
! 2267: if ((*bufp++) & PG_MODIFIED) {
! 2268: register struct hblk * h = (struct hblk *) current_addr;
! 2269:
! 2270: while ((ptr_t)h < current_addr + ps) {
! 2271: register word index = PHT_HASH(h);
! 2272:
! 2273: set_pht_entry_from_index(GC_grungy_pages, index);
! 2274: # ifdef SOLARIS_THREADS
! 2275: {
! 2276: register int slot = FRESH_PAGE_SLOT(h);
! 2277:
! 2278: if (GC_fresh_pages[slot] == h) {
! 2279: GC_fresh_pages[slot] = 0;
! 2280: }
! 2281: }
! 2282: # endif
! 2283: h++;
! 2284: }
! 2285: }
! 2286: }
! 2287: bufp += sizeof(long) - 1;
! 2288: bufp = (char *)((unsigned long)bufp & ~(sizeof(long)-1));
! 2289: }
! 2290: /* Update GC_written_pages. */
! 2291: GC_or_pages(GC_written_pages, GC_grungy_pages);
! 2292: # ifdef SOLARIS_THREADS
! 2293: /* Make sure that old stacks are considered completely clean */
! 2294: /* unless written again. */
! 2295: GC_old_stacks_are_fresh();
! 2296: # endif
! 2297: }
! 2298:
! 2299: #undef READ
! 2300:
! 2301: GC_bool GC_page_was_dirty(h)
! 2302: struct hblk *h;
! 2303: {
! 2304: register word index = PHT_HASH(h);
! 2305: register GC_bool result;
! 2306:
! 2307: result = get_pht_entry_from_index(GC_grungy_pages, index);
! 2308: # ifdef SOLARIS_THREADS
! 2309: if (result && PAGE_IS_FRESH(h)) result = FALSE;
! 2310: /* This happens only if page was declared fresh since */
! 2311: /* the read_dirty call, e.g. because it's in an unused */
! 2312: /* thread stack. It's OK to treat it as clean, in */
! 2313: /* that case. And it's consistent with */
! 2314: /* GC_page_was_ever_dirty. */
! 2315: # endif
! 2316: return(result);
! 2317: }
! 2318:
! 2319: GC_bool GC_page_was_ever_dirty(h)
! 2320: struct hblk *h;
! 2321: {
! 2322: register word index = PHT_HASH(h);
! 2323: register GC_bool result;
! 2324:
! 2325: result = get_pht_entry_from_index(GC_written_pages, index);
! 2326: # ifdef SOLARIS_THREADS
! 2327: if (result && PAGE_IS_FRESH(h)) result = FALSE;
! 2328: # endif
! 2329: return(result);
! 2330: }
! 2331:
! 2332: /* Caller holds allocation lock. */
! 2333: void GC_is_fresh(h, n)
! 2334: struct hblk *h;
! 2335: word n;
! 2336: {
! 2337:
! 2338: register word index;
! 2339:
! 2340: # ifdef SOLARIS_THREADS
! 2341: register word i;
! 2342:
! 2343: if (GC_fresh_pages != 0) {
! 2344: for (i = 0; i < n; i++) {
! 2345: ADD_FRESH_PAGE(h + i);
! 2346: }
! 2347: }
! 2348: # endif
! 2349: }
! 2350:
! 2351: # endif /* PROC_VDB */
! 2352:
! 2353:
! 2354: # ifdef PCR_VDB
! 2355:
! 2356: # include "vd/PCR_VD.h"
! 2357:
! 2358: # define NPAGES (32*1024) /* 128 MB */
! 2359:
! 2360: PCR_VD_DB GC_grungy_bits[NPAGES];
! 2361:
! 2362: ptr_t GC_vd_base; /* Address corresponding to GC_grungy_bits[0] */
! 2363: /* HBLKSIZE aligned. */
! 2364:
! 2365: void GC_dirty_init()
! 2366: {
! 2367: GC_dirty_maintained = TRUE;
! 2368: /* For the time being, we assume the heap generally grows up */
! 2369: GC_vd_base = GC_heap_sects[0].hs_start;
! 2370: if (GC_vd_base == 0) {
! 2371: ABORT("Bad initial heap segment");
! 2372: }
! 2373: if (PCR_VD_Start(HBLKSIZE, GC_vd_base, NPAGES*HBLKSIZE)
! 2374: != PCR_ERes_okay) {
! 2375: ABORT("dirty bit initialization failed");
! 2376: }
! 2377: }
! 2378:
! 2379: void GC_read_dirty()
! 2380: {
! 2381: /* lazily enable dirty bits on newly added heap sects */
! 2382: {
! 2383: static int onhs = 0;
! 2384: int nhs = GC_n_heap_sects;
! 2385: for( ; onhs < nhs; onhs++ ) {
! 2386: PCR_VD_WriteProtectEnable(
! 2387: GC_heap_sects[onhs].hs_start,
! 2388: GC_heap_sects[onhs].hs_bytes );
! 2389: }
! 2390: }
! 2391:
! 2392:
! 2393: if (PCR_VD_Clear(GC_vd_base, NPAGES*HBLKSIZE, GC_grungy_bits)
! 2394: != PCR_ERes_okay) {
! 2395: ABORT("dirty bit read failed");
! 2396: }
! 2397: }
! 2398:
! 2399: GC_bool GC_page_was_dirty(h)
! 2400: struct hblk *h;
! 2401: {
! 2402: if((ptr_t)h < GC_vd_base || (ptr_t)h >= GC_vd_base + NPAGES*HBLKSIZE) {
! 2403: return(TRUE);
! 2404: }
! 2405: return(GC_grungy_bits[h - (struct hblk *)GC_vd_base] & PCR_VD_DB_dirtyBit);
! 2406: }
! 2407:
! 2408: /*ARGSUSED*/
! 2409: void GC_write_hint(h)
! 2410: struct hblk *h;
! 2411: {
! 2412: PCR_VD_WriteProtectDisable(h, HBLKSIZE);
! 2413: PCR_VD_WriteProtectEnable(h, HBLKSIZE);
! 2414: }
! 2415:
! 2416: # endif /* PCR_VDB */
! 2417:
! 2418: /*
! 2419: * Call stack save code for debugging.
! 2420: * Should probably be in mach_dep.c, but that requires reorganization.
! 2421: */
! 2422: #if defined(SPARC) && !defined(LINUX)
! 2423: # if defined(SUNOS4)
! 2424: # include <machine/frame.h>
! 2425: # else
! 2426: # if defined (DRSNX)
! 2427: # include <sys/sparc/frame.h>
! 2428: # else
! 2429: # if defined(OPENBSD)
! 2430: # include <frame.h>
! 2431: # else
! 2432: # include <sys/frame.h>
! 2433: # endif
! 2434: # endif
! 2435: # endif
! 2436: # if NARGS > 6
! 2437: --> We only know how to to get the first 6 arguments
! 2438: # endif
! 2439:
! 2440: #ifdef SAVE_CALL_CHAIN
! 2441: /* Fill in the pc and argument information for up to NFRAMES of my */
! 2442: /* callers. Ignore my frame and my callers frame. */
! 2443:
! 2444: #ifdef OPENBSD
! 2445: # define FR_SAVFP fr_fp
! 2446: # define FR_SAVPC fr_pc
! 2447: #else
! 2448: # define FR_SAVFP fr_savfp
! 2449: # define FR_SAVPC fr_savpc
! 2450: #endif
! 2451:
! 2452: void GC_save_callers (info)
! 2453: struct callinfo info[NFRAMES];
! 2454: {
! 2455: struct frame *frame;
! 2456: struct frame *fp;
! 2457: int nframes = 0;
! 2458: word GC_save_regs_in_stack();
! 2459:
! 2460: frame = (struct frame *) GC_save_regs_in_stack ();
! 2461:
! 2462: for (fp = frame -> FR_SAVFP; fp != 0 && nframes < NFRAMES;
! 2463: fp = fp -> FR_SAVFP, nframes++) {
! 2464: register int i;
! 2465:
! 2466: info[nframes].ci_pc = fp->FR_SAVPC;
! 2467: for (i = 0; i < NARGS; i++) {
! 2468: info[nframes].ci_arg[i] = ~(fp->fr_arg[i]);
! 2469: }
! 2470: }
! 2471: if (nframes < NFRAMES) info[nframes].ci_pc = 0;
! 2472: }
! 2473:
! 2474: #endif /* SAVE_CALL_CHAIN */
! 2475: #endif /* SPARC */
! 2476:
! 2477:
! 2478:
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