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