Kernel/bin/elf.c

   1 /*\r
   2  * Acess v0.1\r
   3  * ELF Executable Loader Code\r
   4  */\r
   5 #define DEBUG   1\r
   6 #include <acess.h>\r
   7 #include <binary.h>\r
   8 #include "elf.h"\r
   9 \r
  10 #define DEBUG_WARN      1\r
  11 \r
  12 \r
  13 // === PROTOTYPES ===\r
  14 tBinary *Elf_Load(int fp);\r
  15  int    Elf_Relocate(void *Base);\r
  16  int    Elf_GetSymbol(void *Base, char *Name, Uint *ret);\r
  17  int    Elf_Int_DoRelocate(Uint r_info, Uint32 *ptr, Uint32 addend, Elf32_Sym *symtab, Uint base);\r
  18 Uint    Elf_Int_HashString(char *str);\r
  19 \r
  20 // === GLOBALS ===\r
  21 tBinaryType     gELF_Info = {\r
  22         NULL,\r
  23         0x464C457F, 0xFFFFFFFF, // '\x7FELF'\r
  24         "ELF",\r
  25         Elf_Load, Elf_Relocate, Elf_GetSymbol\r
  26         };\r
  27 \r
  28 // === CODE ===\r
  29 tBinary *Elf_Load(int fp)\r
  30 {\r
  31         tBinary *ret;\r
  32         Elf32_Ehdr      hdr;\r
  33         Elf32_Phdr      *phtab;\r
  34          int    i, j, k;\r
  35          int    iPageCount;\r
  36          int    count;\r
  37         \r
  38         ENTER("xfp", fp);\r
  39         \r
  40         // Read ELF Header\r
  41         VFS_Read(fp, sizeof(hdr), &hdr);\r
  42         \r
  43         // Check the file type\r
  44         if(hdr.ident[0] != 0x7F || hdr.ident[1] != 'E' || hdr.ident[2] != 'L' || hdr.ident[3] != 'F') {\r
  45                 Warning("Non-ELF File was passed to the ELF loader\n");\r
  46                 LEAVE('n');\r
  47                 return NULL;\r
  48         }\r
  49         \r
  50         // Check for a program header\r
  51         if(hdr.phoff == 0) {\r
  52                 #if DEBUG_WARN\r
  53                 Warning("ELF File does not contain a program header\n");\r
  54                 #endif\r
  55                 LEAVE('n');\r
  56                 return NULL;\r
  57         }\r
  58         \r
  59         // Read Program Header Table\r
  60         phtab = malloc( sizeof(Elf32_Phdr) * hdr.phentcount );\r
  61         if( !phtab ) {\r
  62                 LEAVE('n');\r
  63                 return NULL;\r
  64         }\r
  65         LOG("hdr.phoff = 0x%08x", hdr.phoff);\r
  66         VFS_Seek(fp, hdr.phoff, SEEK_SET);\r
  67         VFS_Read(fp, sizeof(Elf32_Phdr)*hdr.phentcount, phtab);\r
  68         \r
  69         // Count Pages\r
  70         iPageCount = 0;\r
  71         LOG("hdr.phentcount = %i", hdr.phentcount);\r
  72         for( i = 0; i < hdr.phentcount; i++ )\r
  73         {\r
  74                 // Ignore Non-LOAD types\r
  75                 if(phtab[i].Type != PT_LOAD)\r
  76                         continue;\r
  77                 iPageCount += ((phtab[i].VAddr&0xFFF) + phtab[i].MemSize + 0xFFF) >> 12;\r
  78                 LOG("phtab[%i] = {VAddr:0x%x, MemSize:0x%x}", i, phtab[i].VAddr, phtab[i].MemSize);\r
  79         }\r
  80         \r
  81         LOG("iPageCount = %i", iPageCount);\r
  82         \r
  83         // Allocate Information Structure\r
  84         ret = malloc( sizeof(tBinary) + sizeof(tBinaryPage)*iPageCount );\r
  85         // Fill Info Struct\r
  86         ret->Entry = hdr.entrypoint;\r
  87         ret->Base = -1;         // Set Base to maximum value\r
  88         ret->NumPages = iPageCount;\r
  89         ret->Interpreter = NULL;\r
  90         \r
  91         // Load Pages\r
  92         j = 0;\r
  93         for( i = 0; i < hdr.phentcount; i++ )\r
  94         {\r
  95                  int    lastSize;\r
  96                 //LOG("phtab[%i].Type = 0x%x", i, phtab[i].Type);\r
  97                 LOG("phtab[%i] = {", i);\r
  98                 LOG(" .Type = 0x%08x", phtab[i].Type);\r
  99                 LOG(" .Offset = 0x%08x", phtab[i].Offset);\r
 100                 LOG(" .VAddr = 0x%08x", phtab[i].VAddr);\r
 101                 LOG(" .PAddr = 0x%08x", phtab[i].PAddr);\r
 102                 LOG(" .FileSize = 0x%08x", phtab[i].FileSize);\r
 103                 LOG(" .MemSize = 0x%08x", phtab[i].MemSize);\r
 104                 LOG(" .Flags = 0x%08x", phtab[i].Flags);\r
 105                 LOG(" .Align = 0x%08x", phtab[i].Align);\r
 106                 LOG(" }");\r
 107                 // Get Interpreter Name\r
 108                 if( phtab[i].Type == PT_INTERP )\r
 109                 {\r
 110                         char *tmp;\r
 111                         if(ret->Interpreter)    continue;\r
 112                         tmp = malloc(phtab[i].FileSize);\r
 113                         VFS_Seek(fp, phtab[i].Offset, 1);\r
 114                         VFS_Read(fp, phtab[i].FileSize, tmp);\r
 115                         ret->Interpreter = Binary_RegInterp(tmp);\r
 116                         LOG("Interpreter '%s'", tmp);\r
 117                         free(tmp);\r
 118                         continue;\r
 119                 }\r
 120                 // Ignore non-LOAD types\r
 121                 if(phtab[i].Type != PT_LOAD)    continue;\r
 122                 \r
 123                 // Find Base\r
 124                 if(phtab[i].VAddr < ret->Base)  ret->Base = phtab[i].VAddr;\r
 125                 \r
 126                 LOG("phtab[%i] = {VAddr:0x%x,Offset:0x%x,FileSize:0x%x}",\r
 127                         i, phtab[i].VAddr, phtab[i].Offset, phtab[i].FileSize);\r
 128                 \r
 129                 //if( (phtab[i].FileSize & 0xFFF) < 0x1000 - (phtab[i].VAddr & 0xFFF) )\r
 130                 //      lastSize = phtab[i].FileSize;\r
 131                 //else\r
 132                         lastSize = (phtab[i].FileSize & 0xFFF) + (phtab[i].VAddr & 0xFFF);\r
 133                 //lastSize &= 0xFFF;\r
 134                 \r
 135                 //LOG("lastSize = 0x%x", lastSize);\r
 136                 \r
 137                 lastSize = phtab[i].FileSize;\r
 138                 \r
 139                 // Get Pages\r
 140                 count = ( (phtab[i].VAddr&0xFFF) + phtab[i].FileSize + 0xFFF) >> 12;\r
 141                 for( k = 0; k < count; k ++ )\r
 142                 {\r
 143                         ret->Pages[j+k].Virtual = phtab[i].VAddr + (k<<12);\r
 144                         ret->Pages[j+k].Physical = phtab[i].Offset + (k<<12);   // Store the offset in the physical address\r
 145                         if(k != 0) {\r
 146                                 ret->Pages[j+k].Physical -= ret->Pages[j+k].Virtual&0xFFF;\r
 147                                 ret->Pages[j+k].Virtual &= ~0xFFF;\r
 148                         }\r
 149                         if(k == count-1)\r
 150                                 ret->Pages[j+k].Size = lastSize;        // Byte count in page\r
 151                         else if(k == 0)\r
 152                                 ret->Pages[j+k].Size = 4096 - (phtab[i].VAddr&0xFFF);\r
 153                         else\r
 154                                 ret->Pages[j+k].Size = 4096;\r
 155                         LOG("ret->Pages[%i].Size = 0x%x", j+k, ret->Pages[j+k].Size);\r
 156                         ret->Pages[j+k].Flags = 0;\r
 157                         lastSize -= ret->Pages[j+k].Size;\r
 158                 }\r
 159                 count = (phtab[i].MemSize + 0xFFF) >> 12;\r
 160                 for(;k<count;k++)\r
 161                 {\r
 162                         ret->Pages[j+k].Virtual = phtab[i].VAddr + (k<<12);\r
 163                         ret->Pages[j+k].Physical = -1;  // -1 = Fill with zeros\r
 164                         if(k != 0)      ret->Pages[j+k].Virtual &= ~0xFFF;\r
 165                         if(k == count-1 && (phtab[i].MemSize & 0xFFF))\r
 166                                 ret->Pages[j+k].Size = phtab[i].MemSize & 0xFFF;        // Byte count in page\r
 167                         else\r
 168                                 ret->Pages[j+k].Size = 4096;\r
 169                         ret->Pages[j+k].Flags = 0;\r
 170                         LOG("%i - 0x%x => 0x%x - 0x%x", j+k,\r
 171                                 ret->Pages[j+k].Physical, ret->Pages[j+k].Virtual, ret->Pages[j+k].Size);\r
 172                 }\r
 173                 j += count;\r
 174         }\r
 175         \r
 176         #if 0\r
 177         LOG("Cleaning up overlaps");\r
 178         // Clear up Overlaps\r
 179         {\r
 180                 struct {\r
 181                         Uint    V;\r
 182                         Uint    P;\r
 183                         Uint    S;\r
 184                         Uint    F;\r
 185                 } *tmpRgns;\r
 186                 count = j;\r
 187                 tmpRgns = malloc(sizeof(*tmpRgns)*count);\r
 188                 // Copy\r
 189                 for(i=0;i<count;i++) {\r
 190                         tmpRgns[i].V = ret->Pages[i].Virtual;\r
 191                         tmpRgns[i].P = ret->Pages[i].Physical;\r
 192                         tmpRgns[i].S = ret->Pages[i].Size;\r
 193                         tmpRgns[i].F = ret->Pages[i].Flags;\r
 194                 }\r
 195                 // Compact\r
 196                 for(i=1,j=0; i < count; i++)\r
 197                 {                       \r
 198                         if(     tmpRgns[j].F == tmpRgns[i].F\r
 199                         &&      tmpRgns[j].V + tmpRgns[j].S == tmpRgns[i].V\r
 200                         &&      ((tmpRgns[j].P == -1 && tmpRgns[i].P == -1)\r
 201                         || (tmpRgns[j].P + tmpRgns[j].S == tmpRgns[i].P)) )\r
 202                         {\r
 203                                 tmpRgns[j].S += tmpRgns[i].S;\r
 204                         } else {\r
 205                                 j ++;\r
 206                                 tmpRgns[j].V = tmpRgns[i].V;\r
 207                                 tmpRgns[j].P = tmpRgns[i].P;\r
 208                                 tmpRgns[j].F = tmpRgns[i].F;\r
 209                                 tmpRgns[j].S = tmpRgns[i].S;\r
 210                         }\r
 211                 }\r
 212                 j ++;\r
 213                 // Count\r
 214                 count = j;      j = 0;\r
 215                 for(i=0;i<count;i++) {\r
 216                         //LogF(" Elf_Load: %i - 0x%x => 0x%x - 0x%x\n", i, tmpRgns[i].P, tmpRgns[i].V, tmpRgns[i].S);\r
 217                         tmpRgns[i].S += tmpRgns[i].V & 0xFFF;\r
 218                         if(tmpRgns[i].P != -1)  tmpRgns[i].P -= tmpRgns[i].V & 0xFFF;\r
 219                         tmpRgns[i].V &= ~0xFFF;\r
 220                         j += (tmpRgns[i].S + 0xFFF) >> 12;\r
 221                         //LogF(" Elf_Load: %i - 0x%x => 0x%x - 0x%x\n", i, tmpRgns[i].P, tmpRgns[i].V, tmpRgns[i].S);\r
 222                 }\r
 223                 // Reallocate\r
 224                 ret = realloc( ret, sizeof(tBinary) + 3*sizeof(Uint)*j );\r
 225                 if(!ret) {\r
 226                         Warning("BIN", "ElfLoad: Unable to reallocate return structure");\r
 227                         return NULL;\r
 228                 }\r
 229                 ret->NumPages = j;\r
 230                 // Split\r
 231                 k = 0;\r
 232                 for(i=0;i<count;i++) {\r
 233                         for( j = 0; j < (tmpRgns[i].S + 0xFFF) >> 12; j++,k++ ) {\r
 234                                 ret->Pages[k].Flags = tmpRgns[i].F;\r
 235                                 ret->Pages[k].Virtual = tmpRgns[i].V + (j<<12);\r
 236                                 if(tmpRgns[i].P != -1) {\r
 237                                         ret->Pages[k].Physical = tmpRgns[i].P + (j<<12);\r
 238                                 } else\r
 239                                         ret->Pages[k].Physical = -1;\r
 240                                 ret->Pages[k].Size = tmpRgns[i].S - (j << 12);\r
 241                                 // Clamp to page size\r
 242                                 if(ret->Pages[k].Size > 0x1000) ret->Pages[k].Size = 0x1000;\r
 243                         }\r
 244                 }\r
 245                 // Free Temp\r
 246                 free(tmpRgns);\r
 247         }\r
 248         #endif\r
 249         \r
 250         // Clean Up\r
 251         free(phtab);\r
 252         // Return\r
 253         LEAVE('p', ret);\r
 254         return ret;\r
 255 }\r
 256 \r
 257 // --- ELF RELOCATION ---\r
 258 // Taken from 'ld-acess.so'\r
 259 /**\r
 260  \fn int Elf_Relocate(void *Base)\r
 261  \brief Relocates a loaded ELF Executable\r
 262 */\r
 263 int Elf_Relocate(void *Base)\r
 264 {\r
 265         Elf32_Ehdr      *hdr = Base;\r
 266         Elf32_Phdr      *phtab;\r
 267          int    i, j;   // Counters\r
 268         char    *libPath;\r
 269         Uint    iRealBase = -1;\r
 270         Uint    iBaseDiff;\r
 271          int    iSegmentCount;\r
 272          int    iSymCount = 0;\r
 273         Elf32_Rel       *rel = NULL;\r
 274         Elf32_Rela      *rela = NULL;\r
 275         Uint32  *pltgot = NULL;\r
 276         void    *plt = NULL;\r
 277         Uint32  *ptr;\r
 278          int    relSz=0, relEntSz=8;\r
 279          int    relaSz=0, relaEntSz=8;\r
 280          int    pltSz=0, pltType=0;\r
 281         Elf32_Dyn       *dynamicTab = NULL;     // Dynamic Table Pointer\r
 282         char    *dynstrtab = NULL;      // .dynamic String Table\r
 283         Elf32_Sym       *dynsymtab = NULL;\r
 284          int    bFailed = 0;\r
 285         \r
 286         ENTER("pBase", Base);\r
 287         \r
 288         // Parse Program Header to get Dynamic Table\r
 289         phtab = Base + hdr->phoff;\r
 290         iSegmentCount = hdr->phentcount;\r
 291         for(i = 0; i < iSegmentCount; i ++ )\r
 292         {\r
 293                 // Determine linked base address\r
 294                 if(phtab[i].Type == PT_LOAD && iRealBase > phtab[i].VAddr)\r
 295                         iRealBase = phtab[i].VAddr;\r
 296                 \r
 297                 // Find Dynamic Section\r
 298                 if(phtab[i].Type == PT_DYNAMIC) {\r
 299                         if(dynamicTab) {\r
 300                                 Log_Warning("ELF", "Elf_Relocate - Multiple PT_DYNAMIC segments\n");\r
 301                                 continue;\r
 302                         }\r
 303                         dynamicTab = (void *) (tVAddr) phtab[i].VAddr;\r
 304                         j = i;  // Save Dynamic Table ID\r
 305                         break;\r
 306                 }\r
 307         }\r
 308         \r
 309         // Check if a PT_DYNAMIC segement was found\r
 310         if(!dynamicTab) {\r
 311                 Log_Warning("ELF", "Elf_Relocate: No PT_DYNAMIC segment in image, returning\n");\r
 312                 LEAVE('x', hdr->entrypoint);\r
 313                 return hdr->entrypoint;\r
 314         }\r
 315         \r
 316         // Page Align real base\r
 317         iRealBase &= ~0xFFF;\r
 318         \r
 319         // Adjust "Real" Base\r
 320         iBaseDiff = (Uint)Base - iRealBase;\r
 321         // Adjust Dynamic Table\r
 322         dynamicTab = (void *) ((Uint)dynamicTab + iBaseDiff);\r
 323         \r
 324         // === Get Symbol table and String Table ===\r
 325         for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)\r
 326         {\r
 327                 switch(dynamicTab[j].d_tag)\r
 328                 {\r
 329                 // --- Symbol Table ---\r
 330                 case DT_SYMTAB:\r
 331                         dynamicTab[j].d_val += iBaseDiff;\r
 332                         dynsymtab = (void*) (tVAddr) dynamicTab[j].d_val;\r
 333                         hdr->misc.SymTable = dynamicTab[j].d_val;       // Saved in unused bytes of ident\r
 334                         break;\r
 335                 \r
 336                 // --- String Table ---\r
 337                 case DT_STRTAB:\r
 338                         dynamicTab[j].d_val += iBaseDiff;\r
 339                         dynstrtab = (void*) (tVAddr) dynamicTab[j].d_val;\r
 340                         break;\r
 341                 \r
 342                 // --- Hash Table --\r
 343                 case DT_HASH:\r
 344                         dynamicTab[j].d_val += iBaseDiff;\r
 345                         iSymCount = ((Uint*)((tVAddr)dynamicTab[j].d_val))[1];\r
 346                         hdr->misc.HashTable = dynamicTab[j].d_val;      // Saved in unused bytes of ident\r
 347                         break;\r
 348                 }\r
 349         }\r
 350 \r
 351 \r
 352         // Alter Symbols to true base\r
 353         for(i = 0; i < iSymCount; i ++)\r
 354         {\r
 355                 dynsymtab[i].value += iBaseDiff;\r
 356                 dynsymtab[i].nameOfs += (Uint)dynstrtab;\r
 357                 //LOG("Sym '%s' = 0x%x (relocated)\n", dynsymtab[i].name, dynsymtab[i].value);\r
 358         }\r
 359         \r
 360         // === Add to loaded list (can be imported now) ===\r
 361         //Binary_AddLoaded( (Uint)Base );\r
 362 \r
 363         // === Parse Relocation Data ===\r
 364         for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)\r
 365         {\r
 366                 switch(dynamicTab[j].d_tag)\r
 367                 {\r
 368                 // --- Shared Library Name ---\r
 369                 case DT_SONAME:\r
 370                         LOG(".so Name '%s'\n", dynstrtab+dynamicTab[j].d_val);\r
 371                         break;\r
 372                 // --- Needed Library ---\r
 373                 case DT_NEEDED:\r
 374                         libPath = dynstrtab + dynamicTab[j].d_val;\r
 375                         Log_Notice("ELF", "%p - Required Library '%s' (Ignored in kernel mode)\n", Base, libPath);\r
 376                         break;\r
 377                 // --- PLT/GOT ---\r
 378                 case DT_PLTGOT: pltgot = (void*)(iBaseDiff+dynamicTab[j].d_val);        break;\r
 379                 case DT_JMPREL: plt = (void*)(iBaseDiff+dynamicTab[j].d_val);   break;\r
 380                 case DT_PLTREL: pltType = dynamicTab[j].d_val;  break;\r
 381                 case DT_PLTRELSZ:       pltSz = dynamicTab[j].d_val;    break;\r
 382                 \r
 383                 // --- Relocation ---\r
 384                 case DT_REL:    rel = (void*)(iBaseDiff + dynamicTab[j].d_val); break;\r
 385                 case DT_RELSZ:  relSz = dynamicTab[j].d_val;    break;\r
 386                 case DT_RELENT: relEntSz = dynamicTab[j].d_val; break;\r
 387                 \r
 388                 case DT_RELA:   rela = (void*)(iBaseDiff + dynamicTab[j].d_val);        break;\r
 389                 case DT_RELASZ: relaSz = dynamicTab[j].d_val;   break;\r
 390                 case DT_RELAENT:        relaEntSz = dynamicTab[j].d_val;        break;\r
 391                 }\r
 392         }\r
 393         \r
 394         // Parse Relocation Entries\r
 395         if(rel && relSz)\r
 396         {\r
 397                 j = relSz / relEntSz;\r
 398                 for( i = 0; i < j; i++ )\r
 399                 {\r
 400                         ptr = (void*)(iBaseDiff + rel[i].r_offset);\r
 401                         if( !Elf_Int_DoRelocate(rel[i].r_info, ptr, *ptr, dynsymtab, (Uint)Base) ) {\r
 402                                 bFailed = 1;\r
 403                         }\r
 404                 }\r
 405         }\r
 406         // Parse Relocation Entries\r
 407         if(rela && relaSz)\r
 408         {\r
 409                 j = relaSz / relaEntSz;\r
 410                 for( i = 0; i < j; i++ )\r
 411                 {\r
 412                         ptr = (void*)(iBaseDiff + rela[i].r_offset);\r
 413                         if( !Elf_Int_DoRelocate(rel[i].r_info, ptr, rela[i].r_addend, dynsymtab, (Uint)Base) ) {\r
 414                                 bFailed = 1;\r
 415                         }\r
 416                 }\r
 417         }\r
 418         \r
 419         // === Process PLT (Procedure Linkage Table) ===\r
 420         if(plt && pltSz)\r
 421         {\r
 422                 if(pltType == DT_REL)\r
 423                 {\r
 424                         Elf32_Rel       *pltRel = plt;\r
 425                         j = pltSz / sizeof(Elf32_Rel);\r
 426                         LOG("PLT Rel - plt = %p, pltSz = %i (%i ents)", plt, pltSz, j);\r
 427                         for(i = 0; i < j; i++)\r
 428                         {\r
 429                                 ptr = (void*)(iBaseDiff + pltRel[i].r_offset);\r
 430                                 if( !Elf_Int_DoRelocate(pltRel[i].r_info, ptr, *ptr, dynsymtab, (Uint)Base) ) {\r
 431                                         bFailed = 1;\r
 432                                 }\r
 433                         }\r
 434                 }\r
 435                 else\r
 436                 {\r
 437                         Elf32_Rela      *pltRela = plt;\r
 438                         j = pltSz / sizeof(Elf32_Rela);\r
 439                         LOG("PLT RelA - plt = %p, pltSz = %i (%i ents)", plt, pltSz, j);\r
 440                         for(i=0;i<j;i++)\r
 441                         {\r
 442                                 ptr = (void*)(iBaseDiff + pltRela[i].r_offset);\r
 443                                 if( !Elf_Int_DoRelocate(pltRela[i].r_info, ptr, pltRela[i].r_addend, dynsymtab, (Uint)Base) ) {\r
 444                                         bFailed = 1;\r
 445                                 }\r
 446                         }\r
 447                 }\r
 448         }\r
 449         \r
 450         if(bFailed) {\r
 451                 LEAVE('i', 0);\r
 452                 return 0;\r
 453         }\r
 454         \r
 455         LEAVE('x', hdr->entrypoint);\r
 456         return hdr->entrypoint;\r
 457 }\r
 458 \r
 459 /**\r
 460  * \fn void Elf_Int_DoRelocate(Uint r_info, Uint32 *ptr, Uint32 addend, Elf32_Sym *symtab, Uint base)\r
 461  * \brief Performs a relocation\r
 462  * \param r_info        Field from relocation entry\r
 463  * \param ptr   Pointer to location of relocation\r
 464  * \param addend        Value to add to symbol\r
 465  * \param symtab        Symbol Table\r
 466  * \param base  Base of loaded binary\r
 467  */\r
 468 int Elf_Int_DoRelocate(Uint r_info, Uint32 *ptr, Uint32 addend, Elf32_Sym *symtab, Uint base)\r
 469 {\r
 470         Uint    val;\r
 471          int    type = ELF32_R_TYPE(r_info);\r
 472          int    sym = ELF32_R_SYM(r_info);\r
 473         char    *sSymName = symtab[sym].name;\r
 474         \r
 475         //LogF("Elf_Int_DoRelocate: (r_info=0x%x, ptr=0x%x, addend=0x%x, .., base=0x%x)\n",\r
 476         //      r_info, ptr, addend, base);\r
 477         \r
 478         switch( type )\r
 479         {\r
 480         // Standard 32 Bit Relocation (S+A)\r
 481         case R_386_32:\r
 482                 if( !Elf_GetSymbol((void*)base, sSymName, &val) )       // Search this binary first\r
 483                         if( !Binary_GetSymbol( sSymName, &val ) )\r
 484                                 return 0;\r
 485                 LOG("%08x R_386_32 *0x%x += 0x%x('%s')", r_info, ptr, val, sSymName);\r
 486                 *ptr = val + addend;\r
 487                 break;\r
 488                 \r
 489         // 32 Bit Relocation wrt. Offset (S+A-P)\r
 490         case R_386_PC32:\r
 491                 if( !Elf_GetSymbol( (void*)base, sSymName, &val ) )\r
 492                         if( !Binary_GetSymbol( sSymName, &val ) )\r
 493                                 return 0;\r
 494                 LOG("%08x R_386_PC32 *0x%x = 0x%x + 0x%x('%s') - 0x%x", r_info, ptr, *ptr, val, sSymName, (Uint)ptr );\r
 495                 // TODO: Check if it needs the true value of ptr or the compiled value\r
 496                 // NOTE: Testing using true value\r
 497                 *ptr = val + addend - (Uint)ptr;\r
 498                 break;\r
 499 \r
 500         // Absolute Value of a symbol (S)\r
 501         case R_386_GLOB_DAT:\r
 502                 if( !Elf_GetSymbol( (void*)base, sSymName, &val ) )\r
 503                         if( !Binary_GetSymbol( sSymName, &val ) )\r
 504                                 return 0;\r
 505                 LOG("%08x R_386_GLOB_DAT *0x%x = 0x%x (%s)", r_info, ptr, val, sSymName);\r
 506                 *ptr = val;\r
 507                 break;\r
 508         \r
 509         // Absolute Value of a symbol (S)\r
 510         case R_386_JMP_SLOT:\r
 511                 if( !Elf_GetSymbol( (void*)base, sSymName, &val ) )\r
 512                         if( !Binary_GetSymbol( sSymName, &val ) )\r
 513                                 return 0;\r
 514                 LOG("%08x R_386_JMP_SLOT *0x%x = 0x%x (%s)", r_info, ptr, val, sSymName);\r
 515                 *ptr = val;\r
 516                 break;\r
 517 \r
 518         // Base Address (B+A)\r
 519         case R_386_RELATIVE:\r
 520                 LOG("%08x R_386_RELATIVE *0x%x = 0x%x + 0x%x", r_info, ptr, base, addend);\r
 521                 *ptr = base + addend;\r
 522                 break;\r
 523                 \r
 524         default:\r
 525                 LOG("Rel 0x%x: 0x%x,%i", ptr, sym, type);\r
 526                 break;\r
 527         }\r
 528         return 1;\r
 529 }\r
 530 \r
 531 /**\r
 532  * \fn int Elf_GetSymbol(void *Base, char *name, Uint *ret)\r
 533  * \brief Get a symbol from the loaded binary\r
 534  */\r
 535 int Elf_GetSymbol(void *Base, char *Name, Uint *ret)\r
 536 {\r
 537         Elf32_Ehdr      *hdr = (void*)Base;\r
 538         Elf32_Sym       *symtab;\r
 539          int    nbuckets = 0;\r
 540          int    iSymCount = 0;\r
 541          int    i;\r
 542         Uint    *pBuckets;\r
 543         Uint    *pChains;\r
 544         Uint    iNameHash;\r
 545 \r
 546         if(!Base)       return 0;\r
 547 \r
 548         pBuckets = (void *) hdr->misc.HashTable;\r
 549         symtab = (void *) hdr->misc.SymTable;\r
 550         \r
 551         nbuckets = pBuckets[0];\r
 552         iSymCount = pBuckets[1];\r
 553         pBuckets = &pBuckets[2];\r
 554         pChains = &pBuckets[ nbuckets ];\r
 555         \r
 556         // Get hash\r
 557         iNameHash = Elf_Int_HashString(Name);\r
 558         iNameHash %= nbuckets;\r
 559 \r
 560         // Check Bucket\r
 561         i = pBuckets[ iNameHash ];\r
 562         if(symtab[i].shndx != SHN_UNDEF && strcmp(symtab[i].name, Name) == 0) {\r
 563                 if(ret) *ret = symtab[ i ].value;\r
 564                 return 1;\r
 565         }\r
 566         \r
 567         // Walk Chain\r
 568         while(pChains[i] != STN_UNDEF)\r
 569         {\r
 570                 i = pChains[i];\r
 571                 if(symtab[i].shndx != SHN_UNDEF && strcmp(symtab[ i ].name, Name) == 0) {\r
 572                         if(ret) *ret = symtab[ i ].value;\r
 573                         return 1;\r
 574                 }\r
 575         }\r
 576         return 0;\r
 577 }\r
 578 \r
 579 /**\r
 580  * \fn Uint Elf_Int_HashString(char *str)\r
 581  * \brief Hash a string in the ELF format\r
 582  * \param str   String to hash\r
 583  * \return Hash value\r
 584  */\r
 585 Uint Elf_Int_HashString(char *str)\r
 586 {\r
 587         Uint    h = 0, g;\r
 588         while(*str)\r
 589         {\r
 590                 h = (h << 4) + *str++;\r
 591                 if( (g = h & 0xf0000000) )\r
 592                         h ^= g >> 24;\r
 593                 h &= ~g;\r
 594         }\r
 595         return h;\r
 596 }\r