boehm-gc/dyn_load.c

   1 /*
   2  * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
   3  * Copyright (c) 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  * Original author: Bill Janssen
  15  * Heavily modified by Hans Boehm and others
  16  */
  17
  18 /*
  19  * This is incredibly OS specific code for tracking down data sections in
  20  * dynamic libraries.  There appears to be no way of doing this quickly
  21  * without groveling through undocumented data structures.  We would argue
  22  * that this is a bug in the design of the dlopen interface.  THIS CODE
  23  * MAY BREAK IN FUTURE OS RELEASES.  If this matters to you, don't hesitate
  24  * to let your vendor know ...
  25  *
  26  * None of this is safe with dlclose and incremental collection.
  27  * But then not much of anything is safe in the presence of dlclose.
  28  */
  29 #ifndef MACOS
  30 #  include <sys/types.h>
  31 #endif
  32 #include "gc_priv.h"
  33
  34 /* BTL: avoid circular redefinition of dlopen if SOLARIS_THREADS defined */
  35 # if (defined(LINUX_THREADS) || defined(SOLARIS_THREADS) \
  36       || defined(HPUX_THREADS) || defined(IRIX_THREADS)) && defined(dlopen) \
  37      && !defined(USE_LD_WRAP)
  38     /* To support threads in Solaris, gc.h interposes on dlopen by       */
  39     /* defining "dlopen" to be "GC_dlopen", which is implemented below.  */
  40     /* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the   */
  41     /* real system dlopen() in their implementation. We first remove     */
  42     /* gc.h's dlopen definition and restore it later, after GC_dlopen(). */
  43 #   undef dlopen
  44 #   define GC_must_restore_redefined_dlopen
  45 # else
  46 #   undef GC_must_restore_redefined_dlopen
  47 # endif
  48
  49 #if (defined(DYNAMIC_LOADING) || defined(MSWIN32)) && !defined(PCR)
  50 #if !defined(SUNOS4) && !defined(SUNOS5DL) && !defined(IRIX5) && \
  51     !defined(MSWIN32) && !(defined(ALPHA) && defined(OSF1)) && \
  52     !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \
  53     !defined(RS6000) && !defined(SCO_ELF)
  54  --> We only know how to find data segments of dynamic libraries for the
  55  --> above.  Additional SVR4 variants might not be too
  56  --> hard to add.
  57 #endif
  58
  59 #include <stdio.h>
  60 #ifdef SUNOS5DL
  61 #   include <sys/elf.h>
  62 #   include <dlfcn.h>
  63 #   include <link.h>
  64 #endif
  65 #ifdef SUNOS4
  66 #   include <dlfcn.h>
  67 #   include <link.h>
  68 #   include <a.out.h>
  69   /* struct link_map field overrides */
  70 #   define l_next       lm_next
  71 #   define l_addr       lm_addr
  72 #   define l_name       lm_name
  73 #endif
  74
  75
  76 #if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES)
  77
  78 #ifdef LINT
  79     Elf32_Dyn _DYNAMIC;
  80 #endif
  81
  82 static struct link_map *
  83 GC_FirstDLOpenedLinkMap()
  84 {
  85     extern Elf32_Dyn _DYNAMIC;
  86     Elf32_Dyn *dp;
  87     struct r_debug *r;
  88     static struct link_map * cachedResult = 0;
  89     static Elf32_Dyn *dynStructureAddr = 0;
  90                         /* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */
  91
  92 #   ifdef SUNOS53_SHARED_LIB
  93         /* BTL: Avoid the Solaris 5.3 bug that _DYNAMIC isn't being set */
  94         /* up properly in dynamically linked .so's. This means we have  */
  95         /* to use its value in the set of original object files loaded  */
  96         /* at program startup.                                          */
  97         if( dynStructureAddr == 0 ) {
  98           void* startupSyms = dlopen(0, RTLD_LAZY);
  99           dynStructureAddr = (Elf32_Dyn*)dlsym(startupSyms, "_DYNAMIC");
 100                 }
 101 #   else
 102         dynStructureAddr = &_DYNAMIC;
 103 #   endif
 104
 105     if( dynStructureAddr == 0) {
 106         return(0);
 107     }
 108     if( cachedResult == 0 ) {
 109         int tag;
 110         for( dp = ((Elf32_Dyn *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) {
 111             if( tag == DT_DEBUG ) {
 112                 struct link_map *lm
 113                         = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
 114                 if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
 115                 break;
 116             }
 117         }
 118     }
 119     return cachedResult;
 120 }
 121
 122 #endif /* SUNOS5DL ... */
 123
 124 #if defined(SUNOS4) && !defined(USE_PROC_FOR_LIBRARIES)
 125
 126 #ifdef LINT
 127     struct link_dynamic _DYNAMIC;
 128 #endif
 129
 130 static struct link_map *
 131 GC_FirstDLOpenedLinkMap()
 132 {
 133     extern struct link_dynamic _DYNAMIC;
 134
 135     if( &_DYNAMIC == 0) {
 136         return(0);
 137     }
 138     return(_DYNAMIC.ld_un.ld_1->ld_loaded);
 139 }
 140
 141 /* Return the address of the ld.so allocated common symbol      */
 142 /* with the least address, or 0 if none.                        */
 143 static ptr_t GC_first_common()
 144 {
 145     ptr_t result = 0;
 146     extern struct link_dynamic _DYNAMIC;
 147     struct rtc_symb * curr_symbol;
 148
 149     if( &_DYNAMIC == 0) {
 150         return(0);
 151     }
 152     curr_symbol = _DYNAMIC.ldd -> ldd_cp;
 153     for (; curr_symbol != 0; curr_symbol = curr_symbol -> rtc_next) {
 154         if (result == 0
 155             || (ptr_t)(curr_symbol -> rtc_sp -> n_value) < result) {
 156             result = (ptr_t)(curr_symbol -> rtc_sp -> n_value);
 157         }
 158     }
 159     return(result);
 160 }
 161
 162 #endif  /* SUNOS4 ... */
 163
 164 # if defined(LINUX_THREADS) || defined(SOLARIS_THREADS) \
 165      || defined(HPUX_THREADS) || defined(IRIX_THREADS)
 166   /* Make sure we're not in the middle of a collection, and make        */
 167   /* sure we don't start any.   Returns previous value of GC_dont_gc.   */
 168   /* This is invoked prior to a dlopen call to avoid synchronization    */
 169   /* issues.  We can't just acquire the allocation lock, since startup  */
 170   /* code in dlopen may try to allocate.                                */
 171   /* This solution risks heap growth in the presence of many dlopen     */
 172   /* calls in either a multithreaded environment, or if the library     */
 173   /* initialization code allocates substantial amounts of GC'ed memory. */
 174   /* But I don't know of a better solution.                             */
 175   /* This can still deadlock if the client explicitly starts a GC       */
 176   /* during the dlopen.  He shouldn't do that.                          */
 177   static GC_bool disable_gc_for_dlopen()
 178   {
 179     GC_bool result;
 180     LOCK();
 181     result = GC_dont_gc;
 182     while (GC_incremental && GC_collection_in_progress()) {
 183         GC_collect_a_little_inner(1000);
 184     }
 185     GC_dont_gc = TRUE;
 186     UNLOCK();
 187     return(result);
 188   }
 189
 190   /* Redefine dlopen to guarantee mutual exclusion with */
 191   /* GC_register_dynamic_libraries.                     */
 192   /* Should probably happen for other operating systems, too. */
 193
 194 #include <dlfcn.h>
 195
 196 #ifdef USE_LD_WRAP
 197   void * __wrap_dlopen(const char *path, int mode)
 198 #else
 199   void * GC_dlopen(path, mode)
 200   GC_CONST char * path;
 201   int mode;
 202 #endif
 203 {
 204     void * result;
 205     GC_bool dont_gc_save;
 206
 207 #   ifndef USE_PROC_FOR_LIBRARIES
 208       dont_gc_save = disable_gc_for_dlopen();
 209 #   endif
 210 #   ifdef USE_LD_WRAP
 211       result = __real_dlopen(path, mode);
 212 #   else
 213       result = dlopen(path, mode);
 214 #   endif
 215 #   ifndef USE_PROC_FOR_LIBRARIES
 216       GC_dont_gc = dont_gc_save;
 217 #   endif
 218     return(result);
 219 }
 220 # endif  /* SOLARIS_THREADS */
 221
 222 /* BTL: added to fix circular dlopen definition if SOLARIS_THREADS defined */
 223 # if defined(GC_must_restore_redefined_dlopen)
 224 #   define dlopen GC_dlopen
 225 # endif
 226
 227 # if defined(SUNOS4) || defined(SUNOS5DL)
 228 /* Add dynamic library data sections to the root set.           */
 229 # if !defined(PCR) && !defined(SOLARIS_THREADS) && defined(THREADS)
 230 #   ifndef SRC_M3
 231         --> fix mutual exclusion with dlopen
 232 #   endif  /* We assume M3 programs don't call dlopen for now */
 233 # endif
 234
 235 # ifndef USE_PROC_FOR_LIBRARIES
 236 void GC_register_dynamic_libraries()
 237 {
 238   struct link_map *lm = GC_FirstDLOpenedLinkMap();
 239
 240
 241   for (lm = GC_FirstDLOpenedLinkMap();
 242        lm != (struct link_map *) 0;  lm = lm->l_next)
 243     {
 244 #     ifdef SUNOS4
 245         struct exec *e;
 246
 247         e = (struct exec *) lm->lm_addr;
 248         GC_add_roots_inner(
 249                     ((char *) (N_DATOFF(*e) + lm->lm_addr)),
 250                     ((char *) (N_BSSADDR(*e) + e->a_bss + lm->lm_addr)),
 251                     TRUE);
 252 #     endif
 253 #     ifdef SUNOS5DL
 254         Elf32_Ehdr * e;
 255         Elf32_Phdr * p;
 256         unsigned long offset;
 257         char * start;
 258         register int i;
 259
 260         e = (Elf32_Ehdr *) lm->l_addr;
 261         p = ((Elf32_Phdr *)(((char *)(e)) + e->e_phoff));
 262         offset = ((unsigned long)(lm->l_addr));
 263         for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
 264           switch( p->p_type ) {
 265             case PT_LOAD:
 266               {
 267                 if( !(p->p_flags & PF_W) ) break;
 268                 start = ((char *)(p->p_vaddr)) + offset;
 269                 GC_add_roots_inner(
 270                   start,
 271                   start + p->p_memsz,
 272                   TRUE
 273                 );
 274               }
 275               break;
 276             default:
 277               break;
 278           }
 279         }
 280 #     endif
 281     }
 282 #   ifdef SUNOS4
 283       {
 284         static ptr_t common_start = 0;
 285         ptr_t common_end;
 286         extern ptr_t GC_find_limit();
 287
 288         if (common_start == 0) common_start = GC_first_common();
 289         if (common_start != 0) {
 290             common_end = GC_find_limit(common_start, TRUE);
 291             GC_add_roots_inner((char *)common_start, (char *)common_end, TRUE);
 292         }
 293       }
 294 #   endif
 295 }
 296
 297 # endif /* !USE_PROC ... */
 298 # endif /* SUNOS */
 299
 300 #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF)
 301
 302 /* Dynamic loading code for Linux running ELF. Somewhat tested on
 303  * Linux/x86, untested but hopefully should work on Linux/Alpha.
 304  * This code was derived from the Solaris/ELF support. Thanks to
 305  * whatever kind soul wrote that.  - Patrick Bridges */
 306
 307 #include <elf.h>
 308 #include <link.h>
 309
 310 /* Newer versions of Linux/Alpha and Linux/x86 define this macro.  We
 311  * define it for those older versions that don't.  */
 312 #  ifndef ElfW
 313 #    if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32
 314 #      define ElfW(type) Elf32_##type
 315 #    else
 316 #      define ElfW(type) Elf64_##type
 317 #    endif
 318 #  endif
 319
 320 static struct link_map *
 321 GC_FirstDLOpenedLinkMap()
 322 {
 323 #   ifdef __GNUC__
 324 #     pragma weak _DYNAMIC
 325 #   endif
 326     extern ElfW(Dyn) _DYNAMIC[];
 327     ElfW(Dyn) *dp;
 328     struct r_debug *r;
 329     static struct link_map *cachedResult = 0;
 330
 331     if( _DYNAMIC == 0) {
 332         return(0);
 333     }
 334     if( cachedResult == 0 ) {
 335         int tag;
 336         for( dp = _DYNAMIC; (tag = dp->d_tag) != 0; dp++ ) {
 337             if( tag == DT_DEBUG ) {
 338                 struct link_map *lm
 339                         = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
 340                 if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
 341                 break;
 342             }
 343         }
 344     }
 345     return cachedResult;
 346 }
 347
 348
 349 void GC_register_dynamic_libraries()
 350 {
 351   struct link_map *lm = GC_FirstDLOpenedLinkMap();
 352
 353
 354   for (lm = GC_FirstDLOpenedLinkMap();
 355        lm != (struct link_map *) 0;  lm = lm->l_next)
 356     {
 357         ElfW(Ehdr) * e;
 358         ElfW(Phdr) * p;
 359         unsigned long offset;
 360         char * start;
 361         register int i;
 362
 363         e = (ElfW(Ehdr) *) lm->l_addr;
 364         p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
 365         offset = ((unsigned long)(lm->l_addr));
 366         for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
 367           switch( p->p_type ) {
 368             case PT_LOAD:
 369               {
 370                 if( !(p->p_flags & PF_W) ) break;
 371                 start = ((char *)(p->p_vaddr)) + offset;
 372                 GC_add_roots_inner(start, start + p->p_memsz, TRUE);
 373               }
 374               break;
 375             default:
 376               break;
 377           }
 378         }
 379     }
 380 }
 381
 382 #endif
 383
 384 #if defined(IRIX5) || defined(USE_PROC_FOR_LIBRARIES)
 385
 386 #include <sys/procfs.h>
 387 #include <sys/stat.h>
 388 #include <fcntl.h>
 389 #include <elf.h>
 390 #include <errno.h>
 391
 392 extern void * GC_roots_present();
 393         /* The type is a lie, since the real type doesn't make sense here, */
 394         /* and we only test for NULL.                                      */
 395
 396 #ifndef GC_scratch_last_end_ptr
 397 extern ptr_t GC_scratch_last_end_ptr; /* End of GC_scratch_alloc arena  */
 398 #endif
 399
 400 /* We use /proc to track down all parts of the address space that are   */
 401 /* mapped by the process, and throw out regions we know we shouldn't    */
 402 /* worry about.  This may also work under other SVR4 variants.          */
 403 void GC_register_dynamic_libraries()
 404 {
 405     static int fd = -1;
 406     char buf[30];
 407     static prmap_t * addr_map = 0;
 408     static int current_sz = 0;  /* Number of records currently in addr_map */
 409     static int needed_sz;       /* Required size of addr_map            */
 410     register int i;
 411     register long flags;
 412     register ptr_t start;
 413     register ptr_t limit;
 414     ptr_t heap_start = (ptr_t)HEAP_START;
 415     ptr_t heap_end = heap_start;
 416
 417 #   ifdef SUNOS5DL
 418 #     define MA_PHYS 0
 419 #   endif /* SUNOS5DL */
 420
 421     if (fd < 0) {
 422       sprintf(buf, "/proc/%d", getpid());
 423         /* The above generates a lint complaint, since pid_t varies.    */
 424         /* It's unclear how to improve this.                            */
 425       fd = open(buf, O_RDONLY);
 426       if (fd < 0) {
 427         ABORT("/proc open failed");
 428       }
 429     }
 430     if (ioctl(fd, PIOCNMAP, &needed_sz) < 0) {
 431         GC_err_printf2("fd = %d, errno = %d\n", fd, errno);
 432         ABORT("/proc PIOCNMAP ioctl failed");
 433     }
 434     if (needed_sz >= current_sz) {
 435         current_sz = needed_sz * 2 + 1;
 436                         /* Expansion, plus room for 0 record */
 437         addr_map = (prmap_t *)GC_scratch_alloc((word)
 438                                                 (current_sz * sizeof(prmap_t)));
 439     }
 440     if (ioctl(fd, PIOCMAP, addr_map) < 0) {
 441         GC_err_printf4("fd = %d, errno = %d, needed_sz = %d, addr_map = 0x%X\n",
 442                         fd, errno, needed_sz, addr_map);
 443         ABORT("/proc PIOCMAP ioctl failed");
 444     };
 445     if (GC_n_heap_sects > 0) {
 446         heap_end = GC_heap_sects[GC_n_heap_sects-1].hs_start
 447                         + GC_heap_sects[GC_n_heap_sects-1].hs_bytes;
 448         if (heap_end < GC_scratch_last_end_ptr) heap_end = GC_scratch_last_end_ptr;
 449     }
 450     for (i = 0; i < needed_sz; i++) {
 451         flags = addr_map[i].pr_mflags;
 452         if ((flags & (MA_BREAK | MA_STACK | MA_PHYS)) != 0) goto irrelevant;
 453         if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE))
 454             goto irrelevant;
 455           /* The latter test is empirically useless.  Other than the    */
 456           /* main data and stack segments, everything appears to be     */
 457           /* mapped readable, writable, executable, and shared(!!).     */
 458           /* This makes no sense to me. - HB                            */
 459         start = (ptr_t)(addr_map[i].pr_vaddr);
 460         if (GC_roots_present(start)) goto irrelevant;
 461         if (start < heap_end && start >= heap_start)
 462                 goto irrelevant;
 463 #       ifdef MMAP_STACKS
 464           if (GC_is_thread_stack(start)) goto irrelevant;
 465 #       endif /* MMAP_STACKS */
 466
 467         limit = start + addr_map[i].pr_size;
 468         if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) {
 469             /* Discard text segments, i.e. 0-offset mappings against    */
 470             /* executable files which appear to have ELF headers.       */
 471             caddr_t arg;
 472             int obj;
 473 #           define MAP_IRR_SZ 10
 474             static ptr_t map_irr[MAP_IRR_SZ];
 475                                         /* Known irrelevant map entries */
 476             static int n_irr = 0;
 477             struct stat buf;
 478             register int i;
 479
 480             for (i = 0; i < n_irr; i++) {
 481                 if (map_irr[i] == start) goto irrelevant;
 482             }
 483             arg = (caddr_t)start;
 484             obj = ioctl(fd, PIOCOPENM, &arg);
 485             if (obj >= 0) {
 486                 fstat(obj, &buf);
 487                 close(obj);
 488                 if ((buf.st_mode & 0111) != 0) {
 489                     if (n_irr < MAP_IRR_SZ) {
 490                         map_irr[n_irr++] = start;
 491                     }
 492                     goto irrelevant;
 493                 }
 494             }
 495         }
 496         GC_add_roots_inner(start, limit, TRUE);
 497       irrelevant: ;
 498     }
 499     /* Dont keep cached descriptor, for now.  Some kernels don't like us */
 500     /* to keep a /proc file descriptor around during kill -9.            */
 501         if (close(fd) < 0) ABORT("Couldnt close /proc file");
 502         fd = -1;
 503 }
 504
 505 # endif /* USE_PROC || IRIX5 */
 506
 507 # ifdef MSWIN32
 508
 509 # define WIN32_LEAN_AND_MEAN
 510 # define NOSERVICE
 511 # include <windows.h>
 512 # include <stdlib.h>
 513
 514   /* We traverse the entire address space and register all segments     */
 515   /* that could possibly have been written to.                          */
 516   DWORD GC_allocation_granularity;
 517
 518   extern GC_bool GC_is_heap_base (ptr_t p);
 519
 520 # ifdef WIN32_THREADS
 521     extern void GC_get_next_stack(char *start, char **lo, char **hi);
 522 # endif
 523
 524   void GC_cond_add_roots(char *base, char * limit)
 525   {
 526     char dummy;
 527     char * stack_top
 528            = (char *) ((word)(&dummy) & ~(GC_allocation_granularity-1));
 529     if (base == limit) return;
 530 #   ifdef WIN32_THREADS
 531     {
 532         char * curr_base = base;
 533         char * next_stack_lo;
 534         char * next_stack_hi;
 535
 536         for(;;) {
 537             GC_get_next_stack(curr_base, &next_stack_lo, &next_stack_hi);
 538             if (next_stack_lo >= limit) break;
 539             GC_add_roots_inner(curr_base, next_stack_lo, TRUE);
 540             curr_base = next_stack_hi;
 541         }
 542         if (curr_base < limit) GC_add_roots_inner(curr_base, limit, TRUE);
 543     }
 544 #   else
 545         if (limit > stack_top && base < GC_stackbottom) {
 546             /* Part of the stack; ignore it. */
 547             return;
 548         }
 549         GC_add_roots_inner(base, limit, TRUE);
 550 #   endif
 551   }
 552
 553   extern GC_bool GC_win32s;
 554
 555   void GC_register_dynamic_libraries()
 556   {
 557     MEMORY_BASIC_INFORMATION buf;
 558     SYSTEM_INFO sysinfo;
 559     DWORD result;
 560     DWORD protect;
 561     LPVOID p;
 562     char * base;
 563     char * limit, * new_limit;
 564
 565     if (GC_win32s) return;
 566     GetSystemInfo(&sysinfo);
 567     base = limit = p = sysinfo.lpMinimumApplicationAddress;
 568     GC_allocation_granularity = sysinfo.dwAllocationGranularity;
 569     while (p < sysinfo.lpMaximumApplicationAddress) {
 570         result = VirtualQuery(p, &buf, sizeof(buf));
 571         if (result != sizeof(buf)) {
 572             ABORT("Weird VirtualQuery result");
 573         }
 574         new_limit = (char *)p + buf.RegionSize;
 575         protect = buf.Protect;
 576         if (buf.State == MEM_COMMIT
 577             && (protect == PAGE_EXECUTE_READWRITE
 578                 || protect == PAGE_READWRITE)
 579             && !GC_is_heap_base(buf.AllocationBase)) {
 580             if ((char *)p == limit) {
 581                 limit = new_limit;
 582             } else {
 583                 GC_cond_add_roots(base, limit);
 584                 base = p;
 585                 limit = new_limit;
 586             }
 587         }
 588         if (p > (LPVOID)new_limit /* overflow */) break;
 589         p = (LPVOID)new_limit;
 590     }
 591     GC_cond_add_roots(base, limit);
 592   }
 593
 594 #endif /* MSWIN32 */
 595
 596 #if defined(ALPHA) && defined(OSF1)
 597
 598 #include <loader.h>
 599
 600 void GC_register_dynamic_libraries()
 601 {
 602   int status;
 603   ldr_process_t mypid;
 604
 605   /* module */
 606     ldr_module_t moduleid = LDR_NULL_MODULE;
 607     ldr_module_info_t moduleinfo;
 608     size_t moduleinfosize = sizeof(moduleinfo);
 609     size_t modulereturnsize;
 610
 611   /* region */
 612     ldr_region_t region;
 613     ldr_region_info_t regioninfo;
 614     size_t regioninfosize = sizeof(regioninfo);
 615     size_t regionreturnsize;
 616
 617   /* Obtain id of this process */
 618     mypid = ldr_my_process();
 619
 620   /* For each module */
 621     while (TRUE) {
 622
 623       /* Get the next (first) module */
 624         status = ldr_next_module(mypid, &moduleid);
 625
 626       /* Any more modules? */
 627         if (moduleid == LDR_NULL_MODULE)
 628             break;    /* No more modules */
 629
 630       /* Check status AFTER checking moduleid because */
 631       /* of a bug in the non-shared ldr_next_module stub */
 632         if (status != 0 ) {
 633             GC_printf1("dynamic_load: status = %ld\n", (long)status);
 634             {
 635                 extern char *sys_errlist[];
 636                 extern int sys_nerr;
 637                 extern int errno;
 638                 if (errno <= sys_nerr) {
 639                     GC_printf1("dynamic_load: %s\n", (long)sys_errlist[errno]);
 640                } else {
 641                     GC_printf1("dynamic_load: %d\n", (long)errno);
 642                 }
 643         }
 644             ABORT("ldr_next_module failed");
 645          }
 646
 647       /* Get the module information */
 648         status = ldr_inq_module(mypid, moduleid, &moduleinfo,
 649                                 moduleinfosize, &modulereturnsize);
 650         if (status != 0 )
 651             ABORT("ldr_inq_module failed");
 652
 653       /* is module for the main program (i.e. nonshared portion)? */
 654           if (moduleinfo.lmi_flags & LDR_MAIN)
 655               continue;    /* skip the main module */
 656
 657 #     ifdef VERBOSE
 658           GC_printf("---Module---\n");
 659           GC_printf("Module ID            = %16ld\n", moduleinfo.lmi_modid);
 660           GC_printf("Count of regions     = %16d\n", moduleinfo.lmi_nregion);
 661           GC_printf("flags for module     = %16lx\n", moduleinfo.lmi_flags);
 662           GC_printf("pathname of module   = \"%s\"\n", moduleinfo.lmi_name);
 663 #     endif
 664
 665       /* For each region in this module */
 666         for (region = 0; region < moduleinfo.lmi_nregion; region++) {
 667
 668           /* Get the region information */
 669             status = ldr_inq_region(mypid, moduleid, region, &regioninfo,
 670                                     regioninfosize, &regionreturnsize);
 671             if (status != 0 )
 672                 ABORT("ldr_inq_region failed");
 673
 674           /* only process writable (data) regions */
 675             if (! (regioninfo.lri_prot & LDR_W))
 676                 continue;
 677
 678 #         ifdef VERBOSE
 679               GC_printf("--- Region ---\n");
 680               GC_printf("Region number    = %16ld\n",
 681                         regioninfo.lri_region_no);
 682               GC_printf("Protection flags = %016x\n",  regioninfo.lri_prot);
 683               GC_printf("Virtual address  = %16p\n",   regioninfo.lri_vaddr);
 684               GC_printf("Mapped address   = %16p\n",   regioninfo.lri_mapaddr);
 685               GC_printf("Region size      = %16ld\n",  regioninfo.lri_size);
 686               GC_printf("Region name      = \"%s\"\n", regioninfo.lri_name);
 687 #         endif
 688
 689           /* register region as a garbage collection root */
 690             GC_add_roots_inner (
 691                 (char *)regioninfo.lri_mapaddr,
 692                 (char *)regioninfo.lri_mapaddr + regioninfo.lri_size,
 693                 TRUE);
 694
 695         }
 696     }
 697 }
 698 #endif
 699
 700 #if defined(HPUX)
 701
 702 #include <errno.h>
 703 #include <dl.h>
 704
 705 extern int errno;
 706 extern char *sys_errlist[];
 707 extern int sys_nerr;
 708
 709 void GC_register_dynamic_libraries()
 710 {
 711   int status;
 712   int index = 1; /* Ordinal position in shared library search list */
 713   struct shl_descriptor *shl_desc; /* Shared library info, see dl.h */
 714
 715   /* For each dynamic library loaded */
 716     while (TRUE) {
 717
 718       /* Get info about next shared library */
 719         status = shl_get(index, &shl_desc);
 720
 721       /* Check if this is the end of the list or if some error occured */
 722         if (status != 0) {
 723 #        ifdef HPUX_THREADS
 724            /* I've seen errno values of 0.  The man page is not clear   */
 725            /* as to whether errno should get set on a -1 return.        */
 726            break;
 727 #        else
 728           if (errno == EINVAL) {
 729               break; /* Moved past end of shared library list --> finished */
 730           } else {
 731               if (errno <= sys_nerr) {
 732                     GC_printf1("dynamic_load: %s\n", (long) sys_errlist[errno]);
 733               } else {
 734                     GC_printf1("dynamic_load: %d\n", (long) errno);
 735               }
 736               ABORT("shl_get failed");
 737           }
 738 #        endif
 739         }
 740
 741 #     ifdef VERBOSE
 742           GC_printf0("---Shared library---\n");
 743           GC_printf1("\tfilename        = \"%s\"\n", shl_desc->filename);
 744           GC_printf1("\tindex           = %d\n", index);
 745           GC_printf1("\thandle          = %08x\n",
 746                                         (unsigned long) shl_desc->handle);
 747           GC_printf1("\ttext seg. start = %08x\n", shl_desc->tstart);
 748           GC_printf1("\ttext seg. end   = %08x\n", shl_desc->tend);
 749           GC_printf1("\tdata seg. start = %08x\n", shl_desc->dstart);
 750           GC_printf1("\tdata seg. end   = %08x\n", shl_desc->dend);
 751           GC_printf1("\tref. count      = %lu\n", shl_desc->ref_count);
 752 #     endif
 753
 754       /* register shared library's data segment as a garbage collection root */
 755         GC_add_roots_inner((char *) shl_desc->dstart,
 756                            (char *) shl_desc->dend, TRUE);
 757
 758         index++;
 759     }
 760 }
 761 #endif /* HPUX */
 762
 763 #ifdef RS6000
 764 #pragma alloca
 765 #include <sys/ldr.h>
 766 #include <sys/errno.h>
 767 void GC_register_dynamic_libraries()
 768 {
 769         int len;
 770         char *ldibuf;
 771         int ldibuflen;
 772         struct ld_info *ldi;
 773
 774         ldibuf = alloca(ldibuflen = 8192);
 775
 776         while ( (len = loadquery(L_GETINFO,ldibuf,ldibuflen)) < 0) {
 777                 if (errno != ENOMEM) {
 778                         ABORT("loadquery failed");
 779                 }
 780                 ldibuf = alloca(ldibuflen *= 2);
 781         }
 782
 783         ldi = (struct ld_info *)ldibuf;
 784         while (ldi) {
 785                 len = ldi->ldinfo_next;
 786                 GC_add_roots_inner(
 787                                 ldi->ldinfo_dataorg,
 788                                 (unsigned long)ldi->ldinfo_dataorg
 789                                 + ldi->ldinfo_datasize,
 790                                 TRUE);
 791                 ldi = len ? (struct ld_info *)((char *)ldi + len) : 0;
 792         }
 793 }
 794 #endif /* RS6000 */
 795
 796
 797
 798 #else /* !DYNAMIC_LOADING */
 799
 800 #ifdef PCR
 801
 802 #   include "il/PCR_IL.h"
 803 #   include "th/PCR_ThCtl.h"
 804 #   include "mm/PCR_MM.h"
 805
 806 void GC_register_dynamic_libraries()
 807 {
 808     /* Add new static data areas of dynamically loaded modules. */
 809         {
 810           PCR_IL_LoadedFile * p = PCR_IL_GetLastLoadedFile();
 811           PCR_IL_LoadedSegment * q;
 812
 813           /* Skip uncommited files */
 814           while (p != NIL && !(p -> lf_commitPoint)) {
 815               /* The loading of this file has not yet been committed    */
 816               /* Hence its description could be inconsistent.           */
 817               /* Furthermore, it hasn't yet been run.  Hence its data   */
 818               /* segments can't possibly reference heap allocated       */
 819               /* objects.                                               */
 820               p = p -> lf_prev;
 821           }
 822           for (; p != NIL; p = p -> lf_prev) {
 823             for (q = p -> lf_ls; q != NIL; q = q -> ls_next) {
 824               if ((q -> ls_flags & PCR_IL_SegFlags_Traced_MASK)
 825                   == PCR_IL_SegFlags_Traced_on) {
 826                 GC_add_roots_inner
 827                         ((char *)(q -> ls_addr),
 828                          (char *)(q -> ls_addr) + q -> ls_bytes,
 829                          TRUE);
 830               }
 831             }
 832           }
 833         }
 834 }
 835
 836
 837 #else /* !PCR */
 838
 839 void GC_register_dynamic_libraries(){}
 840
 841 int GC_no_dynamic_loading;
 842
 843 #endif /* !PCR */
 844 #endif /* !DYNAMIC_LOADING */