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