Mercurial > pub > dyncall > dyncall
annotate dynload/dynload_syms_mach-o.c @ 226:6e40eb9fb261
- different strategy for mach-o files to lookup symbol names, in order to be consistent with other functions (that use dladdr() and dlsym() calls, which mostly don't use '_' prefixes)
| author | Tassilo Philipp |
|---|---|
| date | Sat, 15 Apr 2017 22:02:58 +0200 |
| parents | 7076f551faf5 |
| children | 85b61e8facfe |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 | |
| 3 Package: dyncall | |
| 4 Library: dynload | |
| 5 File: dynload/dynload_syms_mach-o.c | |
| 219 | 6 Description: |
| 0 | 7 License: |
| 8 | |
| 217 | 9 Copyright (c) 2007-2015 Olivier Chafik <olivier.chafik@gmail.com>, |
| 219 | 10 2017 refactored completely for stability, API |
| 11 consistency and portability by Tassilo Philipp. | |
| 0 | 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 /* | |
| 219 | 30 |
| 0 | 31 dynamic symbol resolver for Mach-O |
| 32 | |
| 33 */ | |
| 34 | |
| 35 #include "dynload.h" | |
| 36 #include "dynload_alloc.h" | |
| 217 | 37 #include "../autovar/autovar_ARCH.h" |
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38 #include "../autovar/autovar_OS.h" |
| 0 | 39 |
| 40 #include <mach-o/dyld.h> | |
| 41 #include <mach-o/nlist.h> | |
| 217 | 42 #include <sys/stat.h> |
| 0 | 43 #include <dlfcn.h> |
| 44 #include <string.h> | |
| 45 | |
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46 #if defined(ARCH_X64) || defined(ARCH_PPC64) || defined(ARCH_ARM64) /*@@@ use dyncall_macros.h*/ |
| 0 | 47 #define MACH_HEADER_TYPE mach_header_64 |
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48 #define MACH_HEADER_MAGIC_NR MH_MAGIC_64 |
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49 #define SEGMEND_COMMAND_ID LC_SEGMENT_64 |
| 219 | 50 #define SEGMENT_COMMAND segment_command_64 |
| 0 | 51 #define NLIST_TYPE nlist_64 |
| 52 #else | |
| 53 #define MACH_HEADER_TYPE mach_header | |
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54 #define MACH_HEADER_MAGIC_NR MH_MAGIC |
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55 #define SEGMEND_COMMAND_ID LC_SEGMENT |
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56 #define SEGMENT_COMMAND segment_command |
| 0 | 57 #define NLIST_TYPE nlist |
| 58 #endif | |
| 59 | |
| 60 | |
| 61 struct DLSyms_ | |
| 62 { | |
| 217 | 63 DLLib* pLib; |
| 64 const char* pStringTable; | |
| 0 | 65 const struct NLIST_TYPE* pSymbolTable; |
| 217 | 66 uint32_t symbolCount; |
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67 uintptr_t symOffset; |
| 0 | 68 }; |
| 69 | |
| 70 | |
| 217 | 71 DLSyms* dlSymsInit(const char* libPath) |
| 0 | 72 { |
| 217 | 73 DLLib* pLib; |
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74 DLSyms* pSyms = NULL; |
| 219 | 75 uint32_t i, n; |
| 217 | 76 struct stat st0; |
| 219 | 77 const struct MACH_HEADER_TYPE* pHeader = NULL; |
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78 const struct dysymtab_command* dysymtab_cmd = NULL; |
| 217 | 79 |
| 80 if(stat(libPath, &st0) == -1) | |
| 81 return NULL; | |
| 82 | |
| 83 pLib = dlLoadLibrary(libPath); | |
| 84 if(!pLib) | |
| 85 return NULL; | |
| 86 | |
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87 /* Loop over all dynamically linked images to find ours. */ |
| 219 | 88 for(i = 0, n = _dyld_image_count(); i < n; ++i) |
| 0 | 89 { |
| 217 | 90 struct stat st1; |
| 219 | 91 const char* name = _dyld_get_image_name(i); |
| 217 | 92 |
| 93 if(name && (stat(name, &st1) != -1)) | |
| 0 | 94 { |
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95 /* Don't rely on name comparison alone, as libPath might be relative, symlink, differently */ |
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96 /* cased, etc., but compare inode number with the one of the mapped dyld image. */ |
| 219 | 97 if(st0.st_ino == st1.st_ino/*!strcmp(name, libPath)*/) |
| 0 | 98 { |
| 219 | 99 pHeader = (const struct MACH_HEADER_TYPE*) _dyld_get_image_header(i); |
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100 break; /* found header */ |
| 0 | 101 } |
| 102 } | |
| 103 } | |
| 219 | 104 |
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105 if(pHeader && (pHeader->magic == MACH_HEADER_MAGIC_NR) && (pHeader->filetype == MH_DYLIB) && !(pHeader->flags & MH_SPLIT_SEGS)) |
| 219 | 106 { |
| 107 const char* pBase = (const char*)pHeader; | |
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108 uintptr_t slide = 0, symOffset = 0; |
| 219 | 109 const struct load_command* cmd = (const struct load_command*)(pBase + sizeof(struct MACH_HEADER_TYPE)); |
| 110 | |
| 111 for(i = 0, n = pHeader->ncmds; i < n; ++i, cmd = (const struct load_command*)((const char*)cmd + cmd->cmdsize)) | |
| 112 { | |
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113 if(cmd->cmd == SEGMEND_COMMAND_ID) |
| 219 | 114 { |
| 115 const struct SEGMENT_COMMAND* seg = (struct SEGMENT_COMMAND*)cmd; | |
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116 if((seg->fileoff == 0) && (seg->filesize != 0)) |
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117 slide = (uintptr_t)pHeader - seg->vmaddr; /* effective offset of segment from header */ |
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118 |
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119 if(strcmp(seg->segname, "__LINKEDIT") == 0) { |
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120 /* Adjust pBase depending on where __LINKEDIT segment is */ |
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121 pBase = (const char*)(seg->vmaddr - seg->fileoff) + slide; |
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122 symOffset = slide; /* this is also offset of symbols */ |
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123 } |
| 219 | 124 } |
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125 else if(cmd->cmd == LC_SYMTAB && !pSyms/* only init once - just safety check */) |
| 219 | 126 { |
| 127 const struct symtab_command* scmd = (const struct symtab_command*)cmd; | |
| 128 | |
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129 /* cmd->cmdsize must be size of struct, otherwise something is off; abort */ |
| 219 | 130 if(cmd->cmdsize != sizeof(struct symtab_command)) |
| 131 break; | |
| 132 | |
| 133 pSyms = (DLSyms*)dlAllocMem(sizeof(DLSyms)); | |
| 134 pSyms->symbolCount = scmd->nsyms; | |
| 135 pSyms->pStringTable = pBase + scmd->stroff; | |
| 136 pSyms->pSymbolTable = (struct NLIST_TYPE*)(pBase + scmd->symoff); | |
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137 pSyms->symOffset = symOffset; |
| 219 | 138 pSyms->pLib = pLib; |
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139 } |
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140 else if(cmd->cmd == LC_DYSYMTAB) |
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141 { |
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142 dysymtab_cmd = (const struct dysymtab_command*)cmd; |
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143 /*@@@ check if(cmd->cmdsize != sizeof(struct dysymtab_command)) { |
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144 dlFreeMem.... |
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145 break; |
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146 }*/ |
| 219 | 147 } |
| 148 } | |
| 149 } | |
| 150 | |
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151 /* Got symbol table? */ |
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152 if(pSyms) { |
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153 /* Alter symtable info if we got symbols organized in local/defined/undefined groups. */ |
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154 /* Only use local ones in that case. */ |
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155 /*@@@ don't restrict to only local symbols if(dysymtab_cmd) { |
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156 pSyms->pSymbolTable += dysymtab_cmd->ilocalsym; |
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157 pSyms->symbolCount = dysymtab_cmd->nlocalsym; |
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158 }*/ |
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159 return pSyms; |
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160 } |
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161 |
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162 /* Couldn't init syms, so free lib and return error. */ |
| 219 | 163 dlFreeLibrary(pLib); |
| 0 | 164 return NULL; |
| 165 } | |
| 166 | |
| 167 | |
| 168 void dlSymsCleanup(DLSyms* pSyms) | |
| 169 { | |
| 217 | 170 if(pSyms) { |
| 171 dlFreeLibrary(pSyms->pLib); | |
| 172 dlFreeMem(pSyms); | |
| 173 } | |
| 0 | 174 } |
| 175 | |
| 176 int dlSymsCount(DLSyms* pSyms) | |
| 177 { | |
| 217 | 178 return pSyms ? pSyms->symbolCount : 0; |
| 0 | 179 } |
| 180 | |
| 219 | 181 |
| 182 const char* dlSymsName(DLSyms* pSyms, int index) | |
| 0 | 183 { |
| 184 const struct NLIST_TYPE* nl; | |
| 219 | 185 unsigned char t; |
| 186 | |
| 187 if(!pSyms) | |
| 0 | 188 return NULL; |
| 217 | 189 |
| 0 | 190 nl = pSyms->pSymbolTable + index; |
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191 t = nl->n_type & N_TYPE; |
| 219 | 192 |
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193 /* Return name by lookup through it's address. This guarantees to be consistent with dlsym and dladdr */ |
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194 /* calls as used in dlFindAddress and dlSymsNameFromValue - the "#if 0"-ed code below returns the */ |
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195 /* name directly, but assumes wrongly that everything is prefixed with an underscore on Darwin. */ |
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196 |
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197 /* only handle symbols that are in a section and aren't symbolic debug entries */ |
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198 if((t == N_SECT) && (nl->n_type & N_STAB) == 0) |
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199 return dlSymsNameFromValue(pSyms, (void*)(nl->n_value + pSyms->symOffset)); |
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200 |
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201 return NULL; /* @@@ handle N_INDR, etc.? */ |
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202 |
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203 #if 0 |
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204 /* Mach-O manual: Symbols with an index into the string table of zero */ |
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205 /* (n_un.n_strx == 0) are defined to have a null ("") name. */ |
| 219 | 206 if(nl->n_un.n_strx == 0) |
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207 return NULL; /*@@@ have return pointer to some static "" string? */ |
| 219 | 208 |
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209 /* Skip undefined symbols. @@@ should we? */ |
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210 if(t == N_UNDF || t == N_PBUD) /* @@@ check if N_PBUD is defined, it's not in the NeXT manual, but on Darwin 8.0.1 */ |
| 219 | 211 return NULL; |
| 217 | 212 |
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213 /*TODO skip more symbols based on nl->n_desc and nl->n_type ? */ |
| 0 | 214 |
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215 /* Return name - handles lookup of indirect names. */ |
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216 return &pSyms->pStringTable[(t == N_INDR ? nl->n_value : nl->n_un.n_strx) |
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217 #if defined(OS_Darwin) |
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218 + 1 /* Skip '_'-prefix */ |
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219 #endif |
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220 ]; |
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221 #endif |
| 0 | 222 } |
| 223 | |
| 224 | |
| 225 const char* dlSymsNameFromValue(DLSyms* pSyms, void* value) | |
| 226 { | |
| 227 Dl_info info; | |
| 228 if (!dladdr(value, &info) || (value != info.dli_saddr)) | |
| 229 return NULL; | |
| 217 | 230 |
| 0 | 231 return info.dli_sname; |
| 232 } | |
| 217 | 233 |