Mercurial > pub > dyncall > dyncall
annotate dynload/dynload_syms_elf.c @ 663:127b569978cc default tip
- another tweak handling clang trying to be too smart (see last commit)
| author | Tassilo Philipp |
|---|---|
| date | Sun, 24 Mar 2024 13:52:44 +0100 |
| parents | 6a8aac9b2bcf |
| children |
| 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 | |
|
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29 #include "../dyncall/dyncall_macros.h" |
| 0 | 30 |
| 31 /* | |
| 32 | |
| 33 dynamic symbol resolver for elf | |
| 34 | |
| 35 */ | |
| 36 | |
| 37 #include "dynload.h" | |
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38 #if defined(DC__OS_OpenBSD) |
| 0 | 39 # include <stdint.h> |
| 40 # include <elf_abi.h> | |
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41 #elif defined(DC__OS_NetBSD) |
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42 # include <stddef.h> |
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43 # include <elf.h> |
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44 #elif defined(DC__OS_SunOS) |
| 0 | 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 */ | |
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68 #if defined(DC__OS_OpenBSD) |
| 0 | 69 #else |
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70 # ifdef DC__Obj_ELF64 |
| 0 | 71 |
| 72 typedef Elf64_Ehdr Elf_Ehdr; | |
| 73 typedef Elf64_Phdr Elf_Phdr; | |
| 74 typedef Elf64_Shdr Elf_Shdr; | |
| 75 typedef Elf64_Sym Elf_Sym; | |
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76 # ifndef DC__OS_SunOS |
| 0 | 77 typedef Elf64_Dyn Elf_Dyn; |
| 78 # endif | |
| 79 typedef Elf64_Sxword Elf_tag; | |
| 80 typedef Elf64_Addr Elf_Addr; | |
| 81 | |
| 82 # else | |
| 83 | |
| 84 typedef Elf32_Ehdr Elf_Ehdr; | |
| 85 typedef Elf32_Phdr Elf_Phdr; | |
| 86 typedef Elf32_Shdr Elf_Shdr; | |
| 87 typedef Elf32_Sym Elf_Sym; | |
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88 # ifndef DC__OS_SunOS |
| 0 | 89 typedef Elf32_Dyn Elf_Dyn; |
| 90 # endif | |
| 91 typedef Elf32_Sword Elf_tag; | |
| 92 typedef Elf32_Addr Elf_Addr; | |
| 93 | |
| 94 # endif | |
| 95 #endif | |
| 96 | |
| 97 | |
| 98 struct DLSyms_ | |
| 99 { | |
| 100 const char* pStrTab; | |
| 101 Elf_Sym* pSymTab; | |
| 102 size_t strTabSize; | |
| 103 size_t nSymbols; | |
| 104 Elf_Ehdr* pElf_Ehdr; /* pointer to elf header */ | |
| 105 int file; /* fd of lib */ | |
| 106 size_t fileSize; /* filesize of open lib */ | |
| 107 }; | |
| 108 | |
| 109 | |
| 110 DLSyms* dlSymsInit(const char* libPath) | |
| 111 { | |
| 112 unsigned char* pMem; | |
| 113 int i; | |
| 114 struct stat st; | |
| 115 Elf_Shdr* pS; | |
| 231 | 116 DLSyms* pSyms; |
| 117 | |
| 118 if(stat(libPath, &st) == -1) | |
| 119 return NULL; | |
| 120 | |
| 121 i = open(libPath, O_RDONLY); | |
| 122 if(i == -1) | |
| 123 return NULL; | |
| 124 | |
| 125 pSyms = (DLSyms*)dlAllocMem(sizeof(DLSyms)); | |
| 0 | 126 memset(pSyms, 0, sizeof(DLSyms)); |
| 231 | 127 pSyms->file = i; |
| 0 | 128 pSyms->fileSize = st.st_size; |
| 129 pSyms->pElf_Ehdr = (Elf_Ehdr*) mmap((void*) NULL, pSyms->fileSize, PROT_READ, MAP_SHARED, pSyms->file, 0); | |
| 130 | |
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131 #ifdef DC__Obj_ELF32 |
| 0 | 132 assert(pSyms->pElf_Ehdr->e_ident[EI_CLASS] == ELFCLASS32); |
| 133 #else | |
| 134 assert(pSyms->pElf_Ehdr->e_ident[EI_CLASS] == ELFCLASS64); | |
| 135 #endif | |
| 136 | |
| 137 assert(pSyms->pElf_Ehdr->e_phoff > 0); | |
| 138 assert(pSyms->pElf_Ehdr->e_shoff > 0); | |
| 139 | |
| 140 | |
| 141 pMem = (unsigned char*)pSyms->pElf_Ehdr; | |
| 142 | |
| 143 /* traverse section headers */ | |
| 144 pS = (Elf_Shdr*) ( pMem + pSyms->pElf_Ehdr->e_shoff ); | |
| 145 /* skip section 0 which is always zero due to the Elf standard. */ | |
| 146 for (i = 1; i < pSyms->pElf_Ehdr->e_shnum; i++) | |
| 147 { | |
| 148 Elf_Shdr* pSection = &pS[i]; | |
| 231 | 149 void* pSectionContent = ((char*)pMem) + pSection->sh_offset; |
| 0 | 150 switch (pSection->sh_type) |
| 151 { | |
| 152 case SHT_DYNSYM: | |
| 153 if (!pSyms->pSymTab) { | |
| 154 pSyms->pSymTab = (Elf_Sym*)pSectionContent; | |
| 155 pSyms->nSymbols = pSection->sh_size / pSection->sh_entsize; | |
| 156 } | |
| 157 break; | |
| 158 case SHT_STRTAB: | |
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159 /* Do not trust pSyms->pElf_Ehdr->e_shstrndx! */ |
| 0 | 160 if (!pSyms->pStrTab) { |
| 161 pSyms->pStrTab = (const char*)pSectionContent; | |
| 162 pSyms->strTabSize = pSection->sh_size; | |
| 163 } | |
| 164 break; | |
| 165 } | |
| 166 if (pSyms->pSymTab && pSyms->pStrTab) | |
| 167 break; | |
| 168 } | |
| 169 return pSyms; | |
| 170 } | |
| 171 | |
| 172 | |
| 173 void dlSymsCleanup(DLSyms* pSyms) | |
| 174 { | |
| 175 if(pSyms) { | |
| 176 munmap((void*) pSyms->pElf_Ehdr, pSyms->fileSize); | |
| 177 close(pSyms->file); | |
| 178 dlFreeMem(pSyms); | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 | |
| 183 int dlSymsCount(DLSyms* pSyms) | |
| 184 { | |
| 231 | 185 return pSyms ? pSyms->nSymbols : 0; |
| 0 | 186 } |
| 187 | |
| 188 | |
| 189 const char* dlSymsName(DLSyms* pSyms, int index) | |
| 190 { | |
| 191 int str_index; | |
| 192 if(!pSyms || !pSyms->pSymTab || index < 0 || index >= pSyms->nSymbols) | |
| 193 return NULL; | |
| 231 | 194 |
| 0 | 195 str_index = pSyms->pSymTab[index].st_name; |
| 196 if (str_index < 0 || str_index >= pSyms->strTabSize) | |
| 197 return NULL; | |
| 198 return &pSyms->pStrTab[str_index]; | |
| 199 } | |
| 200 | |
| 201 | |
| 202 const char* dlSymsNameFromValue(DLSyms* pSyms, void* value) | |
| 203 { | |
| 204 Dl_info info; | |
| 205 return (dladdr(value, &info) && (value == info.dli_saddr)) | |
| 206 ? info.dli_sname | |
| 207 : NULL; | |
| 208 } | |
| 209 |