Mercurial > pub > dyncall > dyncall
annotate dynload/dynload_syms_mach-o.c @ 552:61c485f8cc06
cosmetics & c-comments for consistency
| author | Tassilo Philipp |
|---|---|
| date | Mon, 20 Jun 2022 15:11:52 +0200 |
| parents | 2144287113df |
| children | 6a8aac9b2bcf |
| 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>, |
| 384 | 10 2017-2021 refactored completely for stability, API |
| 219 | 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> | |
| 42 #include <dlfcn.h> | |
| 43 #include <string.h> | |
| 44 | |
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45 #if defined(ARCH_X64) || defined(ARCH_PPC64) || defined(ARCH_ARM64) /*@@@ use dyncall_macros.h*/ |
| 0 | 46 #define MACH_HEADER_TYPE mach_header_64 |
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47 #define MACH_HEADER_MAGIC_NR MH_MAGIC_64 |
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48 #define SEGMEND_COMMAND_ID LC_SEGMENT_64 |
| 219 | 49 #define SEGMENT_COMMAND segment_command_64 |
| 0 | 50 #define NLIST_TYPE nlist_64 |
| 51 #else | |
| 52 #define MACH_HEADER_TYPE mach_header | |
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53 #define MACH_HEADER_MAGIC_NR MH_MAGIC |
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54 #define SEGMEND_COMMAND_ID LC_SEGMENT |
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55 #define SEGMENT_COMMAND segment_command |
| 0 | 56 #define NLIST_TYPE nlist |
| 57 #endif | |
| 58 | |
| 59 | |
| 60 struct DLSyms_ | |
| 61 { | |
| 217 | 62 DLLib* pLib; |
| 63 const char* pStringTable; | |
| 0 | 64 const struct NLIST_TYPE* pSymbolTable; |
| 217 | 65 uint32_t symbolCount; |
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66 uintptr_t symOffset; |
| 0 | 67 }; |
| 68 | |
| 69 | |
| 217 | 70 DLSyms* dlSymsInit(const char* libPath) |
| 0 | 71 { |
| 217 | 72 DLLib* pLib; |
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73 DLSyms* pSyms = NULL; |
| 219 | 74 uint32_t i, n; |
| 75 const struct MACH_HEADER_TYPE* pHeader = NULL; | |
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76 const struct dysymtab_command* dysymtab_cmd = NULL; |
| 217 | 77 |
| 78 pLib = dlLoadLibrary(libPath); | |
| 79 if(!pLib) | |
| 80 return NULL; | |
| 81 | |
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82 /* Loop over all dynamically linked images to find ours. */ |
| 219 | 83 for(i = 0, n = _dyld_image_count(); i < n; ++i) |
| 0 | 84 { |
| 219 | 85 const char* name = _dyld_get_image_name(i); |
| 217 | 86 |
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87 if(name) |
| 0 | 88 { |
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89 /* Don't rely on name comparison alone, as libPath might be relative, symlink, differently */ |
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90 /* cased, use weird osx path placeholders, etc., but compare inode number with the one of the mapped dyld image. */ |
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91 |
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92 /* reload already loaded lib to get handle to compare with, should be lightweight and only increase ref count */ |
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93 DLLib* pLib_ = dlLoadLibrary(name); |
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94 if(pLib_) |
| 0 | 95 { |
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96 /* free / refcount-- */ |
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97 dlFreeLibrary(pLib_); |
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98 |
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99 if(pLib == pLib_) |
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100 { |
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101 pHeader = (const struct MACH_HEADER_TYPE*) _dyld_get_image_header(i); |
| 552 | 102 /*@@@ slide = _dyld_get_image_vmaddr_slide(i);*/ |
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103 break; /* found header */ |
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104 } |
| 0 | 105 } |
| 106 } | |
| 107 } | |
| 219 | 108 |
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109 if(pHeader && (pHeader->magic == MACH_HEADER_MAGIC_NR) && (pHeader->filetype == MH_DYLIB)/*@@@ ignore for now, seems to work without it on El Capitan && !(pHeader->flags & MH_SPLIT_SEGS)*/) |
| 219 | 110 { |
| 111 const char* pBase = (const char*)pHeader; | |
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112 uintptr_t slide = 0, symOffset = 0; |
| 219 | 113 const struct load_command* cmd = (const struct load_command*)(pBase + sizeof(struct MACH_HEADER_TYPE)); |
| 114 | |
| 115 for(i = 0, n = pHeader->ncmds; i < n; ++i, cmd = (const struct load_command*)((const char*)cmd + cmd->cmdsize)) | |
| 116 { | |
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117 if(cmd->cmd == SEGMEND_COMMAND_ID) |
| 219 | 118 { |
| 119 const struct SEGMENT_COMMAND* seg = (struct SEGMENT_COMMAND*)cmd; | |
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120 /*@@@ unsure why I used this instead of checking __TEXT: if((seg->fileoff == 0) && (seg->filesize != 0))*/ |
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121 if(strcmp(seg->segname, "__TEXT") == 0) |
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122 slide = (uintptr_t)pHeader - seg->vmaddr; /* effective offset of segment from header */ |
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123 |
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124 /* If we have __LINKEDIT segment (= raw data for dynamic linkers), use that one to find symbal table address. */ |
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125 if(strcmp(seg->segname, "__LINKEDIT") == 0) { |
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126 /* Recompute pBase relative to where __LINKEDIT segment is in memory. */ |
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127 pBase = (const char*)(seg->vmaddr - seg->fileoff) + slide; |
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128 |
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129 /*@@@ we might want to also check maxprot and initprot here: |
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130 VM_PROT_READ ((vm_prot_t) 0x01) |
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131 VM_PROT_WRITE ((vm_prot_t) 0x02) |
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132 VM_PROT_EXECUTE ((vm_prot_t) 0x04)*/ |
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133 |
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134 symOffset = slide; /* this is also offset of symbols */ |
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135 } |
| 219 | 136 } |
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137 else if(cmd->cmd == LC_SYMTAB && !pSyms/* only init once - just safety check */) |
| 219 | 138 { |
| 139 const struct symtab_command* scmd = (const struct symtab_command*)cmd; | |
| 140 | |
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141 /* cmd->cmdsize must be size of struct, otherwise something is off; abort */ |
| 219 | 142 if(cmd->cmdsize != sizeof(struct symtab_command)) |
| 143 break; | |
| 144 | |
| 145 pSyms = (DLSyms*)dlAllocMem(sizeof(DLSyms)); | |
| 146 pSyms->symbolCount = scmd->nsyms; | |
| 147 pSyms->pStringTable = pBase + scmd->stroff; | |
| 148 pSyms->pSymbolTable = (struct NLIST_TYPE*)(pBase + scmd->symoff); | |
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149 pSyms->symOffset = symOffset; |
| 219 | 150 pSyms->pLib = pLib; |
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151 } |
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152 else if(cmd->cmd == LC_DYSYMTAB && !dysymtab_cmd/* only init once - just safety check */) |
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153 { |
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154 /* @@@ unused, we'll always run over all symbols, and not check locals, globals, etc. |
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155 if(cmd->cmdsize != sizeof(struct symtab_command)) { |
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156 dlSymsCleanup(pSyms); |
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157 break; |
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158 } |
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159 |
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160 dysymtab_cmd = (const struct dysymtab_command*)cmd;*/ |
| 219 | 161 } |
| 162 } | |
| 163 } | |
| 164 | |
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165 /* Got symbol table? */ |
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166 if(pSyms) { |
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167 /* Alter symtable info if we got symbols organized in local/defined/undefined groups. */ |
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168 /* Only use local ones in that case. */ |
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169 /*@@@ don't restrict to only local symbols if(dysymtab_cmd) { |
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170 pSyms->pSymbolTable += dysymtab_cmd->ilocalsym; |
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171 pSyms->symbolCount = dysymtab_cmd->nlocalsym; |
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172 }*/ |
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173 return pSyms; |
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174 } |
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175 |
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176 /* Couldn't init syms, so free lib and return error. */ |
| 219 | 177 dlFreeLibrary(pLib); |
| 0 | 178 return NULL; |
| 179 } | |
| 180 | |
| 181 | |
| 182 void dlSymsCleanup(DLSyms* pSyms) | |
| 183 { | |
| 217 | 184 if(pSyms) { |
| 185 dlFreeLibrary(pSyms->pLib); | |
| 186 dlFreeMem(pSyms); | |
| 187 } | |
| 0 | 188 } |
| 189 | |
| 190 int dlSymsCount(DLSyms* pSyms) | |
| 191 { | |
| 217 | 192 return pSyms ? pSyms->symbolCount : 0; |
| 0 | 193 } |
| 194 | |
| 219 | 195 |
| 196 const char* dlSymsName(DLSyms* pSyms, int index) | |
| 0 | 197 { |
| 198 const struct NLIST_TYPE* nl; | |
| 219 | 199 unsigned char t; |
| 200 | |
| 201 if(!pSyms) | |
| 0 | 202 return NULL; |
| 217 | 203 |
| 0 | 204 nl = pSyms->pSymbolTable + index; |
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205 t = nl->n_type & N_TYPE; |
| 219 | 206 |
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207 /* Return name by lookup through it's address. This guarantees to be consistent with dlsym and dladdr */ |
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208 /* calls as used in dlFindAddress and dlSymsNameFromValue - the "#if 0"-ed code below returns the */ |
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209 /* name directly, but assumes wrongly that everything is prefixed with an underscore on Darwin. */ |
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210 |
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211 /* only handle symbols that are in a section and aren't symbolic debug entries */ |
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212 if((t == N_SECT) && (nl->n_type & N_STAB) == 0) |
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213 return dlSymsNameFromValue(pSyms, (void*)(nl->n_value + pSyms->symOffset)); |
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214 |
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215 return NULL; /* @@@ handle N_INDR, etc.? */ |
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216 |
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217 #if 0 |
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220
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218 /* Mach-O manual: Symbols with an index into the string table of zero */ |
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219 /* (n_un.n_strx == 0) are defined to have a null ("") name. */ |
| 219 | 220 if(nl->n_un.n_strx == 0) |
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221 return NULL; /*@@@ have return pointer to some static "" string? */ |
| 219 | 222 |
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223 /* Skip undefined symbols. @@@ should we? */ |
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224 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 | 225 return NULL; |
| 217 | 226 |
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227 /*TODO skip more symbols based on nl->n_desc and nl->n_type ? */ |
| 0 | 228 |
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229 /* Return name - handles lookup of indirect names. */ |
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230 return &pSyms->pStringTable[(t == N_INDR ? nl->n_value : nl->n_un.n_strx) |
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231 #if defined(OS_Darwin) |
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232 + 1 /* Skip '_'-prefix */ |
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233 #endif |
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234 ]; |
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235 #endif |
| 0 | 236 } |
| 237 | |
| 238 | |
| 239 const char* dlSymsNameFromValue(DLSyms* pSyms, void* value) | |
| 240 { | |
| 241 Dl_info info; | |
| 242 if (!dladdr(value, &info) || (value != info.dli_saddr)) | |
| 243 return NULL; | |
| 217 | 244 |
| 0 | 245 return info.dli_sname; |
| 246 } | |
| 217 | 247 |