Mercurial > pub > dyncall > dyncall
annotate dynload/dynload_syms_elf.c @ 457:90b1d927912a
- suite_aggrs: make sure random memory used doesn't ever result in NaN fp values (for every possible address), as this messes with result comparison
| author | Tassilo Philipp |
|---|---|
| date | Fri, 28 Jan 2022 14:11:21 +0100 |
| parents | c7f879fef352 |
| children | 6a8aac9b2bcf |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 | |
| 3 Package: dyncall | |
| 4 Library: dynload | |
| 5 File: dynload/dynload_syms_elf.c | |
| 6 Description: | |
| 7 License: | |
| 8 | |
| 281 | 9 Copyright (c) 2007-2018 Daniel Adler <dadler@uni-goettingen.de>, |
| 0 | 10 Tassilo Philipp <tphilipp@potion-studios.com>, |
| 11 Olivier Chafik <olivier.chafik@gmail.com> | |
| 12 | |
| 13 Permission to use, copy, modify, and distribute this software for any | |
| 14 purpose with or without fee is hereby granted, provided that the above | |
| 15 copyright notice and this permission notice appear in all copies. | |
| 16 | |
| 17 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| 18 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 19 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
| 20 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 21 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 22 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
| 23 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 24 | |
| 25 */ | |
| 26 | |
| 27 | |
| 28 | |
| 29 #include "../autovar/autovar_OS.h" | |
| 30 | |
| 31 /* | |
| 32 | |
| 33 dynamic symbol resolver for elf | |
| 34 | |
| 35 */ | |
| 36 | |
| 37 #include "dynload.h" | |
| 38 #if defined(OS_OpenBSD) | |
| 39 # include <stdint.h> | |
| 40 # include <elf_abi.h> | |
|
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41 #elif defined(OS_NetBSD) |
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42 # include <stddef.h> |
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43 # include <elf.h> |
| 0 | 44 #elif defined(OS_SunOS) |
| 45 # include <libelf.h> | |
| 46 #else | |
| 47 # include <elf.h> | |
| 48 #endif | |
| 49 | |
| 50 #if defined(__GLIBC__) | |
| 51 # define _GNU_SOURCE | |
| 52 # define __USE_GNU | |
| 53 #endif | |
| 54 | |
| 55 #include "dynload_alloc.h" | |
| 56 | |
| 57 #include <assert.h> | |
| 58 #include <fcntl.h> | |
| 59 #include <dlfcn.h> | |
| 60 #include <stdio.h> | |
| 61 #include <string.h> | |
| 62 #include <sys/stat.h> | |
| 63 #include <sys/types.h> | |
| 64 #include <sys/mman.h> | |
| 65 #include <unistd.h> | |
| 66 | |
| 67 /* run-time configuration 64/32 */ | |
| 68 #if defined(OS_OpenBSD) | |
| 69 #else | |
| 70 # include "../autovar/autovar_ABI.h" | |
| 71 # ifdef ABI_ELF64 | |
| 72 | |
| 73 typedef Elf64_Ehdr Elf_Ehdr; | |
| 74 typedef Elf64_Phdr Elf_Phdr; | |
| 75 typedef Elf64_Shdr Elf_Shdr; | |
| 76 typedef Elf64_Sym Elf_Sym; | |
| 77 # ifndef OS_SunOS | |
| 78 typedef Elf64_Dyn Elf_Dyn; | |
| 79 # endif | |
| 80 typedef Elf64_Sxword Elf_tag; | |
| 81 typedef Elf64_Addr Elf_Addr; | |
| 82 | |
| 83 # else | |
| 84 | |
| 85 typedef Elf32_Ehdr Elf_Ehdr; | |
| 86 typedef Elf32_Phdr Elf_Phdr; | |
| 87 typedef Elf32_Shdr Elf_Shdr; | |
| 88 typedef Elf32_Sym Elf_Sym; | |
| 89 # ifndef OS_SunOS | |
| 90 typedef Elf32_Dyn Elf_Dyn; | |
| 91 # endif | |
| 92 typedef Elf32_Sword Elf_tag; | |
| 93 typedef Elf32_Addr Elf_Addr; | |
| 94 | |
| 95 # endif | |
| 96 #endif | |
| 97 | |
| 98 | |
| 99 struct DLSyms_ | |
| 100 { | |
| 101 const char* pStrTab; | |
| 102 Elf_Sym* pSymTab; | |
| 103 size_t strTabSize; | |
| 104 size_t nSymbols; | |
| 105 Elf_Ehdr* pElf_Ehdr; /* pointer to elf header */ | |
| 106 int file; /* fd of lib */ | |
| 107 size_t fileSize; /* filesize of open lib */ | |
| 108 }; | |
| 109 | |
| 110 | |
| 111 DLSyms* dlSymsInit(const char* libPath) | |
| 112 { | |
| 113 unsigned char* pMem; | |
| 114 int i; | |
| 115 struct stat st; | |
| 116 Elf_Shdr* pS; | |
| 231 | 117 DLSyms* pSyms; |
| 118 | |
| 119 if(stat(libPath, &st) == -1) | |
| 120 return NULL; | |
| 121 | |
| 122 i = open(libPath, O_RDONLY); | |
| 123 if(i == -1) | |
| 124 return NULL; | |
| 125 | |
| 126 pSyms = (DLSyms*)dlAllocMem(sizeof(DLSyms)); | |
| 0 | 127 memset(pSyms, 0, sizeof(DLSyms)); |
| 231 | 128 pSyms->file = i; |
| 0 | 129 pSyms->fileSize = st.st_size; |
| 130 pSyms->pElf_Ehdr = (Elf_Ehdr*) mmap((void*) NULL, pSyms->fileSize, PROT_READ, MAP_SHARED, pSyms->file, 0); | |
| 131 | |
| 132 #ifdef ABI_ELF32 | |
| 133 assert(pSyms->pElf_Ehdr->e_ident[EI_CLASS] == ELFCLASS32); | |
| 134 #else | |
| 135 assert(pSyms->pElf_Ehdr->e_ident[EI_CLASS] == ELFCLASS64); | |
| 136 #endif | |
| 137 | |
| 138 assert(pSyms->pElf_Ehdr->e_phoff > 0); | |
| 139 assert(pSyms->pElf_Ehdr->e_shoff > 0); | |
| 140 | |
| 141 | |
| 142 pMem = (unsigned char*)pSyms->pElf_Ehdr; | |
| 143 | |
| 144 /* traverse section headers */ | |
| 145 pS = (Elf_Shdr*) ( pMem + pSyms->pElf_Ehdr->e_shoff ); | |
| 146 /* skip section 0 which is always zero due to the Elf standard. */ | |
| 147 for (i = 1; i < pSyms->pElf_Ehdr->e_shnum; i++) | |
| 148 { | |
| 149 Elf_Shdr* pSection = &pS[i]; | |
| 231 | 150 void* pSectionContent = ((char*)pMem) + pSection->sh_offset; |
| 0 | 151 switch (pSection->sh_type) |
| 152 { | |
| 153 case SHT_DYNSYM: | |
| 154 if (!pSyms->pSymTab) { | |
| 155 pSyms->pSymTab = (Elf_Sym*)pSectionContent; | |
| 156 pSyms->nSymbols = pSection->sh_size / pSection->sh_entsize; | |
| 157 } | |
| 158 break; | |
| 159 case SHT_STRTAB: | |
|
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160 /* Do not trust pSyms->pElf_Ehdr->e_shstrndx! */ |
| 0 | 161 if (!pSyms->pStrTab) { |
| 162 pSyms->pStrTab = (const char*)pSectionContent; | |
| 163 pSyms->strTabSize = pSection->sh_size; | |
| 164 } | |
| 165 break; | |
| 166 } | |
| 167 if (pSyms->pSymTab && pSyms->pStrTab) | |
| 168 break; | |
| 169 } | |
| 170 return pSyms; | |
| 171 } | |
| 172 | |
| 173 | |
| 174 void dlSymsCleanup(DLSyms* pSyms) | |
| 175 { | |
| 176 if(pSyms) { | |
| 177 munmap((void*) pSyms->pElf_Ehdr, pSyms->fileSize); | |
| 178 close(pSyms->file); | |
| 179 dlFreeMem(pSyms); | |
| 180 } | |
| 181 } | |
| 182 | |
| 183 | |
| 184 int dlSymsCount(DLSyms* pSyms) | |
| 185 { | |
| 231 | 186 return pSyms ? pSyms->nSymbols : 0; |
| 0 | 187 } |
| 188 | |
| 189 | |
| 190 const char* dlSymsName(DLSyms* pSyms, int index) | |
| 191 { | |
| 192 int str_index; | |
| 193 if(!pSyms || !pSyms->pSymTab || index < 0 || index >= pSyms->nSymbols) | |
| 194 return NULL; | |
| 231 | 195 |
| 0 | 196 str_index = pSyms->pSymTab[index].st_name; |
| 197 if (str_index < 0 || str_index >= pSyms->strTabSize) | |
| 198 return NULL; | |
| 199 return &pSyms->pStrTab[str_index]; | |
| 200 } | |
| 201 | |
| 202 | |
| 203 const char* dlSymsNameFromValue(DLSyms* pSyms, void* value) | |
| 204 { | |
| 205 Dl_info info; | |
| 206 return (dladdr(value, &info) && (value == info.dli_saddr)) | |
| 207 ? info.dli_sname | |
| 208 : NULL; | |
| 209 } | |
| 210 |