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Annotation of src/libexec/ld.elf_so/map_object.c, Revision 1.44.2.3

1.44.2.2  tls         1: /*     $NetBSD$         */
1.1       cgd         2:
                      3: /*
                      4:  * Copyright 1996 John D. Polstra.
                      5:  * Copyright 1996 Matt Thomas <matt@3am-software.com>
1.24      mycroft     6:  * Copyright 2002 Charles M. Hannum <root@ihack.net>
1.1       cgd         7:  * All rights reserved.
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. All advertising materials mentioning features or use of this software
                     18:  *    must display the following acknowledgement:
                     19:  *      This product includes software developed by John Polstra.
                     20:  * 4. The name of the author may not be used to endorse or promote products
                     21:  *    derived from this software without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     25:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     26:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     27:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     28:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     29:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     30:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     31:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     32:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     33:  */
                     34:
1.31      skrll      35: #include <sys/cdefs.h>
                     36: #ifndef lint
1.44.2.2  tls        37: __RCSID("$NetBSD$");
1.31      skrll      38: #endif /* not lint */
                     39:
1.1       cgd        40: #include <errno.h>
                     41: #include <stddef.h>
1.10      mycroft    42: #include <stdlib.h>
1.1       cgd        43: #include <string.h>
                     44: #include <unistd.h>
1.10      mycroft    45: #include <sys/stat.h>
1.1       cgd        46: #include <sys/types.h>
                     47: #include <sys/mman.h>
                     48:
1.41      skrll      49: #include "debug.h"
1.1       cgd        50: #include "rtld.h"
1.7       hannken    51:
1.30      skrll      52: static int protflags(int);     /* Elf flags -> mmap protection */
1.1       cgd        53:
1.41      skrll      54: #define EA_UNDEF               (~(Elf_Addr)0)
                     55:
1.1       cgd        56: /*
                     57:  * Map a shared object into memory.  The argument is a file descriptor,
                     58:  * which must be open on the object and positioned at its beginning.
                     59:  *
                     60:  * The return value is a pointer to a newly-allocated Obj_Entry structure
                     61:  * for the shared object.  Returns NULL on failure.
                     62:  */
                     63: Obj_Entry *
1.34      christos   64: _rtld_map_object(const char *path, int fd, const struct stat *sb)
1.1       cgd        65: {
1.18      junyoung   66:        Obj_Entry       *obj;
                     67:        Elf_Ehdr        *ehdr;
                     68:        Elf_Phdr        *phdr;
1.42      joerg      69: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
                     70:        Elf_Phdr        *phtls;
                     71: #endif
1.41      skrll      72:        size_t           phsize;
1.18      junyoung   73:        Elf_Phdr        *phlimit;
                     74:        Elf_Phdr        *segs[2];
                     75:        int              nsegs;
1.22      mycroft    76:        caddr_t          mapbase = MAP_FAILED;
1.32      lukem      77:        size_t           mapsize = 0;
1.27      matt       78:        int              mapflags;
1.18      junyoung   79:        Elf_Off          base_offset;
1.28      taca       80: #ifdef MAP_ALIGNED
1.27      matt       81:        Elf_Addr         base_alignment;
1.28      taca       82: #endif
1.18      junyoung   83:        Elf_Addr         base_vaddr;
                     84:        Elf_Addr         base_vlimit;
                     85:        Elf_Addr         text_vlimit;
1.22      mycroft    86:        int              text_flags;
1.18      junyoung   87:        caddr_t          base_addr;
                     88:        Elf_Off          data_offset;
                     89:        Elf_Addr         data_vaddr;
                     90:        Elf_Addr         data_vlimit;
1.22      mycroft    91:        int              data_flags;
1.18      junyoung   92:        caddr_t          data_addr;
1.42      joerg      93: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
                     94:        Elf_Addr         tls_vaddr = 0; /* Noise GCC */
                     95: #endif
1.41      skrll      96:        Elf_Addr         phdr_vaddr;
                     97:        size_t           phdr_memsz;
1.18      junyoung   98:        caddr_t          gap_addr;
                     99:        size_t           gap_size;
1.41      skrll     100:        int i;
1.1       cgd       101: #ifdef RTLD_LOADER
1.18      junyoung  102:        Elf_Addr         clear_vaddr;
                    103:        caddr_t          clear_addr;
                    104:        size_t           nclear;
1.1       cgd       105: #endif
1.26      fvdl      106:
1.38      christos  107:        if (sb != NULL && sb->st_size < (off_t)sizeof (Elf_Ehdr)) {
1.44.2.1  tls       108:                _rtld_error("%s: not ELF file (too short)", path);
1.26      fvdl      109:                return NULL;
                    110:        }
1.1       cgd       111:
1.22      mycroft   112:        obj = _rtld_obj_new();
1.34      christos  113:        obj->path = xstrdup(path);
1.25      junyoung  114:        obj->pathlen = strlen(path);
1.22      mycroft   115:        if (sb != NULL) {
                    116:                obj->dev = sb->st_dev;
                    117:                obj->ino = sb->st_ino;
                    118:        }
                    119:
1.20      mycroft   120:        ehdr = mmap(NULL, _rtld_pagesz, PROT_READ, MAP_FILE | MAP_SHARED, fd,
1.16      mycroft   121:            (off_t)0);
1.36      ad        122:        obj->ehdr = ehdr;
1.20      mycroft   123:        if (ehdr == MAP_FAILED) {
1.4       christos  124:                _rtld_error("%s: read error: %s", path, xstrerror(errno));
1.22      mycroft   125:                goto bad;
1.4       christos  126:        }
                    127:        /* Make sure the file is valid */
1.44.2.1  tls       128:        if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0) {
                    129:                _rtld_error("%s: not ELF file (magic number bad)", path);
                    130:                goto bad;
                    131:        }
                    132:        if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
                    133:                _rtld_error("%s: invalid ELF class %x; expected %x", path,
1.40      skrll     134:                    ehdr->e_ident[EI_CLASS], ELFCLASS);
1.16      mycroft   135:                goto bad;
1.4       christos  136:        }
                    137:        /* Elf_e_ident includes class */
1.17      junyoung  138:        if (ehdr->e_ident[EI_VERSION] != EV_CURRENT ||
                    139:            ehdr->e_version != EV_CURRENT ||
                    140:            ehdr->e_ident[EI_DATA] != ELFDEFNNAME(MACHDEP_ENDIANNESS)) {
1.16      mycroft   141:                _rtld_error("%s: unsupported file version", path);
                    142:                goto bad;
                    143:        }
1.17      junyoung  144:        if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) {
1.16      mycroft   145:                _rtld_error("%s: unsupported file type", path);
                    146:                goto bad;
1.4       christos  147:        }
1.17      junyoung  148:        switch (ehdr->e_machine) {
1.4       christos  149:                ELFDEFNNAME(MACHDEP_ID_CASES)
                    150:        default:
1.16      mycroft   151:                _rtld_error("%s: unsupported machine", path);
                    152:                goto bad;
1.4       christos  153:        }
                    154:
                    155:        /*
                    156:          * We rely on the program header being in the first page.  This is
                    157:          * not strictly required by the ABI specification, but it seems to
                    158:          * always true in practice.  And, it simplifies things considerably.
                    159:          */
1.17      junyoung  160:        assert(ehdr->e_phentsize == sizeof(Elf_Phdr));
1.19      junyoung  161:        assert(ehdr->e_phoff + ehdr->e_phnum * sizeof(Elf_Phdr) <=
                    162:            _rtld_pagesz);
1.4       christos  163:
                    164:        /*
                    165:          * Scan the program header entries, and save key information.
                    166:          *
                    167:          * We rely on there being exactly two load segments, text and data,
                    168:          * in that order.
                    169:          */
1.17      junyoung  170:        phdr = (Elf_Phdr *) ((caddr_t)ehdr + ehdr->e_phoff);
1.42      joerg     171: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
                    172:        phtls = NULL;
                    173: #endif
1.41      skrll     174:        phsize = ehdr->e_phnum * sizeof(phdr[0]);
                    175:        obj->phdr = NULL;
                    176:        phdr_vaddr = EA_UNDEF;
                    177:        phdr_memsz = 0;
1.17      junyoung  178:        phlimit = phdr + ehdr->e_phnum;
1.4       christos  179:        nsegs = 0;
                    180:        while (phdr < phlimit) {
                    181:                switch (phdr->p_type) {
1.10      mycroft   182:                case PT_INTERP:
1.37      mrg       183:                        obj->interp = (void *)(uintptr_t)phdr->p_vaddr;
1.41      skrll     184:                        dbg(("%s: PT_INTERP %p", obj->path, obj->interp));
1.10      mycroft   185:                        break;
1.1       cgd       186:
1.8       kleink    187:                case PT_LOAD:
1.12      mycroft   188:                        if (nsegs < 2)
                    189:                                segs[nsegs] = phdr;
1.4       christos  190:                        ++nsegs;
1.44      martin    191:
                    192:                        dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_LOAD",
1.43      christos  193:                            (void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
1.4       christos  194:                        break;
                    195:
1.41      skrll     196:                case PT_PHDR:
                    197:                        phdr_vaddr = phdr->p_vaddr;
                    198:                        phdr_memsz = phdr->p_memsz;
1.44      martin    199:                        dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_PHDR",
1.43      christos  200:                            (void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
1.41      skrll     201:                        break;
1.44.2.2  tls       202:
1.8       kleink    203:                case PT_DYNAMIC:
1.37      mrg       204:                        obj->dynamic = (void *)(uintptr_t)phdr->p_vaddr;
1.44      martin    205:                        dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_DYNAMIC",
1.43      christos  206:                            (void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
1.4       christos  207:                        break;
1.42      joerg     208:
                    209: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
                    210:                case PT_TLS:
                    211:                        phtls = phdr;
1.44      martin    212:                        dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_TLS",
1.43      christos  213:                            (void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
1.42      joerg     214:                        break;
                    215: #endif
1.44.2.2  tls       216: #ifdef __ARM_EABI__
                    217:                case PT_ARM_EXIDX:
                    218:                        obj->exidx_start = (void *)(uintptr_t)phdr->p_vaddr;
                    219:                        obj->exidx_sz = phdr->p_memsz;
                    220:                        break;
                    221: #endif
1.4       christos  222:                }
1.1       cgd       223:
1.4       christos  224:                ++phdr;
                    225:        }
1.41      skrll     226:        phdr = (Elf_Phdr *) ((caddr_t)ehdr + ehdr->e_phoff);
1.37      mrg       227:        obj->entry = (void *)(uintptr_t)ehdr->e_entry;
1.22      mycroft   228:        if (!obj->dynamic) {
1.12      mycroft   229:                _rtld_error("%s: not dynamically linked", path);
1.16      mycroft   230:                goto bad;
1.12      mycroft   231:        }
                    232:        if (nsegs != 2) {
                    233:                _rtld_error("%s: wrong number of segments (%d != 2)", path,
                    234:                    nsegs);
1.16      mycroft   235:                goto bad;
1.4       christos  236:        }
1.1       cgd       237:
1.4       christos  238:        /*
1.11      chs       239:         * Map the entire address space of the object as a file
1.5       thorpej   240:         * region to stake out our contiguous region and establish a
1.11      chs       241:         * base for relocation.  We use a file mapping so that
                    242:         * the kernel will give us whatever alignment is appropriate
                    243:         * for the platform we're running on.
1.5       thorpej   244:         *
1.11      chs       245:         * We map it using the text protection, map the data segment
                    246:         * into the right place, then map an anon segment for the bss
                    247:         * and unmap the gaps left by padding to alignment.
1.5       thorpej   248:         */
1.11      chs       249:
1.27      matt      250: #ifdef MAP_ALIGNED
                    251:        base_alignment = segs[0]->p_align;
                    252: #endif
1.4       christos  253:        base_offset = round_down(segs[0]->p_offset);
                    254:        base_vaddr = round_down(segs[0]->p_vaddr);
                    255:        base_vlimit = round_up(segs[1]->p_vaddr + segs[1]->p_memsz);
1.11      chs       256:        text_vlimit = round_up(segs[0]->p_vaddr + segs[0]->p_memsz);
1.22      mycroft   257:        text_flags = protflags(segs[0]->p_flags);
                    258:        data_offset = round_down(segs[1]->p_offset);
                    259:        data_vaddr = round_down(segs[1]->p_vaddr);
                    260:        data_vlimit = round_up(segs[1]->p_vaddr + segs[1]->p_filesz);
                    261:        data_flags = protflags(segs[1]->p_flags);
1.23      mycroft   262: #ifdef RTLD_LOADER
1.22      mycroft   263:        clear_vaddr = segs[1]->p_vaddr + segs[1]->p_filesz;
1.23      mycroft   264: #endif
1.22      mycroft   265:
                    266:        obj->textsize = text_vlimit - base_vaddr;
                    267:        obj->vaddrbase = base_vaddr;
                    268:        obj->isdynamic = ehdr->e_type == ET_DYN;
                    269:
1.42      joerg     270: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
                    271:        if (phtls != NULL) {
                    272:                ++_rtld_tls_dtv_generation;
                    273:                obj->tlsindex = ++_rtld_tls_max_index;
                    274:                obj->tlssize = phtls->p_memsz;
                    275:                obj->tlsalign = phtls->p_align;
                    276:                obj->tlsinitsize = phtls->p_filesz;
                    277:                tls_vaddr = phtls->p_vaddr;
                    278:        }
                    279: #endif
                    280:
1.41      skrll     281:        obj->phdr_loaded = false;
                    282:        for (i = 0; i < nsegs; i++) {
                    283:                if (phdr_vaddr != EA_UNDEF &&
                    284:                    segs[i]->p_vaddr <= phdr_vaddr &&
                    285:                    segs[i]->p_memsz >= phdr_memsz) {
                    286:                        obj->phdr_loaded = true;
                    287:                        break;
                    288:                }
                    289:                if (segs[i]->p_offset <= ehdr->e_phoff &&
                    290:                    segs[i]->p_memsz >= phsize) {
                    291:                        phdr_vaddr = segs[i]->p_vaddr + ehdr->e_phoff;
                    292:                        phdr_memsz = phsize;
                    293:                        obj->phdr_loaded = true;
                    294:                        break;
                    295:                }
                    296:        }
                    297:        if (obj->phdr_loaded) {
                    298:                obj->phdr = (void *)(uintptr_t)phdr_vaddr;
                    299:                obj->phsize = phdr_memsz;
                    300:        } else {
                    301:                Elf_Phdr *buf;
                    302:                buf = xmalloc(phsize);
                    303:                if (buf == NULL) {
                    304:                        _rtld_error("%s: cannot allocate program header", path);
                    305:                        goto bad;
                    306:                }
                    307:                memcpy(buf, phdr, phsize);
                    308:                obj->phdr = buf;
                    309:                obj->phsize = phsize;
                    310:        }
                    311:        dbg(("%s: phdr %p phsize %zu (%s)", obj->path, obj->phdr, obj->phsize,
                    312:             obj->phdr_loaded ? "loaded" : "allocated"));
                    313:
1.36      ad        314:        /* Unmap header if it overlaps the first load section. */
                    315:        if (base_offset < _rtld_pagesz) {
                    316:                munmap(ehdr, _rtld_pagesz);
                    317:                obj->ehdr = MAP_FAILED;
                    318:        }
1.11      chs       319:
1.27      matt      320:        /*
                    321:         * Calculate log2 of the base section alignment.
                    322:         */
                    323:        mapflags = 0;
                    324: #ifdef MAP_ALIGNED
                    325:        if (base_alignment > _rtld_pagesz) {
                    326:                unsigned int log2 = 0;
                    327:                for (; base_alignment > 1; base_alignment >>= 1)
                    328:                        log2++;
                    329:                mapflags = MAP_ALIGNED(log2);
                    330:        }
                    331: #endif
                    332:
1.1       cgd       333: #ifdef RTLD_LOADER
1.22      mycroft   334:        base_addr = obj->isdynamic ? NULL : (caddr_t)base_vaddr;
1.1       cgd       335: #else
1.4       christos  336:        base_addr = NULL;
1.1       cgd       337: #endif
1.22      mycroft   338:        mapsize = base_vlimit - base_vaddr;
1.27      matt      339:        mapbase = mmap(base_addr, mapsize, text_flags,
                    340:            mapflags | MAP_FILE | MAP_PRIVATE, fd, base_offset);
1.5       thorpej   341:        if (mapbase == MAP_FAILED) {
1.4       christos  342:                _rtld_error("mmap of entire address space failed: %s",
                    343:                    xstrerror(errno));
1.16      mycroft   344:                goto bad;
1.4       christos  345:        }
1.11      chs       346:
1.4       christos  347:        /* Overlay the data segment onto the proper region. */
                    348:        data_addr = mapbase + (data_vaddr - base_vaddr);
1.22      mycroft   349:        if (mmap(data_addr, data_vlimit - data_vaddr, data_flags,
                    350:            MAP_FILE | MAP_PRIVATE | MAP_FIXED, fd, data_offset) ==
                    351:            MAP_FAILED) {
1.4       christos  352:                _rtld_error("mmap of data failed: %s", xstrerror(errno));
1.22      mycroft   353:                goto bad;
1.11      chs       354:        }
                    355:
                    356:        /* Overlay the bss segment onto the proper region. */
                    357:        if (mmap(mapbase + data_vlimit - base_vaddr, base_vlimit - data_vlimit,
1.22      mycroft   358:            data_flags, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) ==
                    359:            MAP_FAILED) {
1.11      chs       360:                _rtld_error("mmap of bss failed: %s", xstrerror(errno));
1.22      mycroft   361:                goto bad;
1.4       christos  362:        }
1.5       thorpej   363:
                    364:        /* Unmap the gap between the text and data. */
1.22      mycroft   365:        gap_addr = mapbase + round_up(text_vlimit - base_vaddr);
1.5       thorpej   366:        gap_size = data_addr - gap_addr;
1.21      mycroft   367:        if (gap_size != 0 && mprotect(gap_addr, gap_size, PROT_NONE) == -1) {
                    368:                _rtld_error("mprotect of text -> data gap failed: %s",
1.5       thorpej   369:                    xstrerror(errno));
1.22      mycroft   370:                goto bad;
1.5       thorpej   371:        }
                    372:
1.1       cgd       373: #ifdef RTLD_LOADER
1.4       christos  374:        /* Clear any BSS in the last page of the data segment. */
                    375:        clear_addr = mapbase + (clear_vaddr - base_vaddr);
                    376:        if ((nclear = data_vlimit - clear_vaddr) > 0)
                    377:                memset(clear_addr, 0, nclear);
                    378:
1.5       thorpej   379:        /* Non-file portion of BSS mapped above. */
1.1       cgd       380: #endif
                    381:
1.42      joerg     382: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
                    383:        if (phtls != NULL)
                    384:                obj->tlsinit = mapbase + tls_vaddr;
                    385: #endif
                    386:
1.4       christos  387:        obj->mapbase = mapbase;
                    388:        obj->mapsize = mapsize;
                    389:        obj->relocbase = mapbase - base_vaddr;
1.10      mycroft   390:
1.22      mycroft   391:        if (obj->dynamic)
1.37      mrg       392:                obj->dynamic = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->dynamic);
1.22      mycroft   393:        if (obj->entry)
1.37      mrg       394:                obj->entry = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->entry);
1.22      mycroft   395:        if (obj->interp)
1.37      mrg       396:                obj->interp = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->interp);
1.41      skrll     397:        if (obj->phdr_loaded)
                    398:                obj->phdr =  (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->phdr);
1.44.2.2  tls       399: #ifdef __ARM_EABI__
                    400:        if (obj->exidx_start)
                    401:                obj->exidx_start = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->exidx_start);
                    402: #endif
1.22      mycroft   403:
1.10      mycroft   404:        return obj;
1.16      mycroft   405:
                    406: bad:
1.36      ad        407:        if (obj->ehdr != MAP_FAILED)
                    408:                munmap(obj->ehdr, _rtld_pagesz);
1.22      mycroft   409:        if (mapbase != MAP_FAILED)
                    410:                munmap(mapbase, mapsize);
                    411:        _rtld_obj_free(obj);
1.16      mycroft   412:        return NULL;
1.10      mycroft   413: }
                    414:
                    415: void
1.30      skrll     416: _rtld_obj_free(Obj_Entry *obj)
1.10      mycroft   417: {
                    418:        Objlist_Entry *elm;
1.44.2.2  tls       419:        Name_Entry *entry;
1.10      mycroft   420:
1.42      joerg     421: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
                    422:        if (obj->tls_done)
                    423:                _rtld_tls_offset_free(obj);
                    424: #endif
1.35      ad        425:        xfree(obj->path);
1.10      mycroft   426:        while (obj->needed != NULL) {
                    427:                Needed_Entry *needed = obj->needed;
                    428:                obj->needed = needed->next;
1.35      ad        429:                xfree(needed);
1.10      mycroft   430:        }
1.44.2.2  tls       431:        while ((entry = SIMPLEQ_FIRST(&obj->names)) != NULL) {
                    432:                SIMPLEQ_REMOVE_HEAD(&obj->names, link);
                    433:                xfree(entry);
                    434:        }
1.13      lukem     435:        while ((elm = SIMPLEQ_FIRST(&obj->dldags)) != NULL) {
                    436:                SIMPLEQ_REMOVE_HEAD(&obj->dldags, link);
1.35      ad        437:                xfree(elm);
1.10      mycroft   438:        }
1.13      lukem     439:        while ((elm = SIMPLEQ_FIRST(&obj->dagmembers)) != NULL) {
                    440:                SIMPLEQ_REMOVE_HEAD(&obj->dagmembers, link);
1.35      ad        441:                xfree(elm);
1.10      mycroft   442:        }
1.41      skrll     443:        if (!obj->phdr_loaded)
                    444:                xfree((void *)(uintptr_t)obj->phdr);
1.35      ad        445:        xfree(obj);
1.39      skrll     446: #ifdef COMBRELOC
                    447:        _rtld_combreloc_reset(obj);
                    448: #endif
1.10      mycroft   449: }
                    450:
                    451: Obj_Entry *
                    452: _rtld_obj_new(void)
                    453: {
                    454:        Obj_Entry *obj;
                    455:
                    456:        obj = CNEW(Obj_Entry);
1.44.2.2  tls       457:        SIMPLEQ_INIT(&obj->names);
1.10      mycroft   458:        SIMPLEQ_INIT(&obj->dldags);
                    459:        SIMPLEQ_INIT(&obj->dagmembers);
1.4       christos  460:        return obj;
1.1       cgd       461: }
                    462:
                    463: /*
                    464:  * Given a set of ELF protection flags, return the corresponding protection
                    465:  * flags for MMAP.
                    466:  */
                    467: static int
1.30      skrll     468: protflags(int elfflags)
1.1       cgd       469: {
1.4       christos  470:        int prot = 0;
1.29      simonb    471:
1.8       kleink    472:        if (elfflags & PF_R)
1.4       christos  473:                prot |= PROT_READ;
1.1       cgd       474: #ifdef RTLD_LOADER
1.8       kleink    475:        if (elfflags & PF_W)
1.4       christos  476:                prot |= PROT_WRITE;
1.1       cgd       477: #endif
1.8       kleink    478:        if (elfflags & PF_X)
1.4       christos  479:                prot |= PROT_EXEC;
                    480:        return prot;
1.1       cgd       481: }

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