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