BaseTools/Source/C/GenFw/Elf32Convert.c

   1 /** @file
   2
   3 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
   4
   5 This program and the accompanying materials are licensed and made available
   6 under the terms and conditions of the BSD License which accompanies this
   7 distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "WinNtInclude.h"
  16
  17 #ifndef __GNUC__
  18 #include <windows.h>
  19 #include <io.h>
  20 #endif
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <time.h>
  25 #include <ctype.h>
  26
  27 #include <Common/UefiBaseTypes.h>
  28 #include <IndustryStandard/PeImage.h>
  29
  30 #include "PeCoffLib.h"
  31 #include "EfiUtilityMsgs.h"
  32
  33 #include "GenFw.h"
  34 #include "ElfConvert.h"
  35 #include "Elf32Convert.h"
  36
  37 STATIC
  38 VOID
  39 ScanSections32 (
  40   VOID
  41   );
  42
  43 STATIC
  44 BOOLEAN
  45 WriteSections32 (
  46   SECTION_FILTER_TYPES  FilterType
  47   );
  48
  49 STATIC
  50 VOID
  51 WriteRelocations32 (
  52   VOID
  53   );
  54
  55 STATIC
  56 VOID
  57 WriteDebug32 (
  58   VOID
  59   );
  60
  61 STATIC
  62 VOID
  63 SetImageSize32 (
  64   VOID
  65   );
  66
  67 STATIC
  68 VOID
  69 CleanUp32 (
  70   VOID
  71   );
  72
  73 //
  74 // Rename ELF32 strucutres to common names to help when porting to ELF64.
  75 //
  76 typedef Elf32_Shdr Elf_Shdr;
  77 typedef Elf32_Ehdr Elf_Ehdr;
  78 typedef Elf32_Rel Elf_Rel;
  79 typedef Elf32_Sym Elf_Sym;
  80 typedef Elf32_Phdr Elf_Phdr;
  81 typedef Elf32_Dyn Elf_Dyn;
  82 #define ELFCLASS ELFCLASS32
  83 #define ELF_R_TYPE(r) ELF32_R_TYPE(r)
  84 #define ELF_R_SYM(r) ELF32_R_SYM(r)
  85
  86 //
  87 // Well known ELF structures.
  88 //
  89 STATIC Elf_Ehdr *mEhdr;
  90 STATIC Elf_Shdr *mShdrBase;
  91 STATIC Elf_Phdr *mPhdrBase;
  92
  93 //
  94 // Coff information
  95 //
  96 STATIC const UINT32 mCoffAlignment = 0x20;
  97
  98 //
  99 // PE section alignment.
 100 //
 101 STATIC const UINT16 mCoffNbrSections = 5;
 102
 103 //
 104 // ELF sections to offset in Coff file.
 105 //
 106 STATIC UINT32 *mCoffSectionsOffset = NULL;
 107
 108 //
 109 // Offsets in COFF file
 110 //
 111 STATIC UINT32 mNtHdrOffset;
 112 STATIC UINT32 mTextOffset;
 113 STATIC UINT32 mDataOffset;
 114 STATIC UINT32 mHiiRsrcOffset;
 115 STATIC UINT32 mRelocOffset;
 116
 117 //
 118 // Initialization Function
 119 //
 120 BOOLEAN
 121 InitializeElf32 (
 122   UINT8               *FileBuffer,
 123   ELF_FUNCTION_TABLE  *ElfFunctions
 124   )
 125 {
 126   //
 127   // Initialize data pointer and structures.
 128   //
 129   mEhdr = (Elf_Ehdr*) FileBuffer;
 130
 131   //
 132   // Check the ELF32 specific header information.
 133   //
 134   if (mEhdr->e_ident[EI_CLASS] != ELFCLASS32) {
 135     Error (NULL, 0, 3000, "Unsupported", "ELF EI_DATA not ELFCLASS32");
 136     return FALSE;
 137   }
 138   if (mEhdr->e_ident[EI_DATA] != ELFDATA2LSB) {
 139     Error (NULL, 0, 3000, "Unsupported", "ELF EI_DATA not ELFDATA2LSB");
 140     return FALSE;
 141   }
 142   if ((mEhdr->e_type != ET_EXEC) && (mEhdr->e_type != ET_DYN)) {
 143     Error (NULL, 0, 3000, "Unsupported", "ELF e_type not ET_EXEC or ET_DYN");
 144     return FALSE;
 145   }
 146   if (!((mEhdr->e_machine == EM_386) || (mEhdr->e_machine == EM_ARM))) {
 147     Error (NULL, 0, 3000, "Unsupported", "ELF e_machine not EM_386 or EM_ARM");
 148     return FALSE;
 149   }
 150   if (mEhdr->e_version != EV_CURRENT) {
 151     Error (NULL, 0, 3000, "Unsupported", "ELF e_version (%u) not EV_CURRENT (%d)", (unsigned) mEhdr->e_version, EV_CURRENT);
 152     return FALSE;
 153   }
 154
 155   //
 156   // Update section header pointers
 157   //
 158   mShdrBase  = (Elf_Shdr *)((UINT8 *)mEhdr + mEhdr->e_shoff);
 159   mPhdrBase = (Elf_Phdr *)((UINT8 *)mEhdr + mEhdr->e_phoff);
 160
 161   //
 162   // Create COFF Section offset buffer and zero.
 163   //
 164   mCoffSectionsOffset = (UINT32 *)malloc(mEhdr->e_shnum * sizeof (UINT32));
 165   memset(mCoffSectionsOffset, 0, mEhdr->e_shnum * sizeof(UINT32));
 166
 167   //
 168   // Fill in function pointers.
 169   //
 170   ElfFunctions->ScanSections = ScanSections32;
 171   ElfFunctions->WriteSections = WriteSections32;
 172   ElfFunctions->WriteRelocations = WriteRelocations32;
 173   ElfFunctions->WriteDebug = WriteDebug32;
 174   ElfFunctions->SetImageSize = SetImageSize32;
 175   ElfFunctions->CleanUp = CleanUp32;
 176
 177   return TRUE;
 178 }
 179
 180
 181 //
 182 // Header by Index functions
 183 //
 184 STATIC
 185 Elf_Shdr*
 186 GetShdrByIndex (
 187   UINT32 Num
 188   )
 189 {
 190   if (Num >= mEhdr->e_shnum)
 191     return NULL;
 192   return (Elf_Shdr*)((UINT8*)mShdrBase + Num * mEhdr->e_shentsize);
 193 }
 194
 195 STATIC
 196 Elf_Phdr*
 197 GetPhdrByIndex (
 198   UINT32 num
 199   )
 200 {
 201   if (num >= mEhdr->e_phnum) {
 202     return NULL;
 203   }
 204
 205   return (Elf_Phdr *)((UINT8*)mPhdrBase + num * mEhdr->e_phentsize);
 206 }
 207
 208 STATIC
 209 UINT32
 210 CoffAlign (
 211   UINT32 Offset
 212   )
 213 {
 214   return (Offset + mCoffAlignment - 1) & ~(mCoffAlignment - 1);
 215 }
 216
 217 //
 218 // filter functions
 219 //
 220 STATIC
 221 BOOLEAN
 222 IsTextShdr (
 223   Elf_Shdr *Shdr
 224   )
 225 {
 226   return (BOOLEAN) ((Shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) == SHF_ALLOC);
 227 }
 228
 229 STATIC
 230 BOOLEAN
 231 IsHiiRsrcShdr (
 232   Elf_Shdr *Shdr
 233   )
 234 {
 235   Elf_Shdr *Namedr = GetShdrByIndex(mEhdr->e_shstrndx);
 236
 237   return (BOOLEAN) (strcmp((CHAR8*)mEhdr + Namedr->sh_offset + Shdr->sh_name, ELF_HII_SECTION_NAME) == 0);
 238 }
 239
 240 STATIC
 241 BOOLEAN
 242 IsDataShdr (
 243   Elf_Shdr *Shdr
 244   )
 245 {
 246   if (IsHiiRsrcShdr(Shdr)) {
 247     return FALSE;
 248   }
 249   return (BOOLEAN) (Shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) == (SHF_ALLOC | SHF_WRITE);
 250 }
 251
 252 //
 253 // Elf functions interface implementation
 254 //
 255
 256 STATIC
 257 VOID
 258 ScanSections32 (
 259   VOID
 260   )
 261 {
 262   UINT32                          i;
 263   EFI_IMAGE_DOS_HEADER            *DosHdr;
 264   EFI_IMAGE_OPTIONAL_HEADER_UNION *NtHdr;
 265   UINT32                          CoffEntry;
 266   UINT32                          SectionCount;
 267
 268   CoffEntry = 0;
 269   mCoffOffset = 0;
 270
 271   //
 272   // Coff file start with a DOS header.
 273   //
 274   mCoffOffset = sizeof(EFI_IMAGE_DOS_HEADER) + 0x40;
 275   mNtHdrOffset = mCoffOffset;
 276   switch (mEhdr->e_machine) {
 277   case EM_386:
 278   case EM_ARM:
 279     mCoffOffset += sizeof (EFI_IMAGE_NT_HEADERS32);
 280   break;
 281   default:
 282     VerboseMsg ("%s unknown e_machine type. Assume IA-32", (UINTN)mEhdr->e_machine);
 283     mCoffOffset += sizeof (EFI_IMAGE_NT_HEADERS32);
 284   break;
 285   }
 286
 287   mTableOffset = mCoffOffset;
 288   mCoffOffset += mCoffNbrSections * sizeof(EFI_IMAGE_SECTION_HEADER);
 289
 290   //
 291   // First text sections.
 292   //
 293   mCoffOffset = CoffAlign(mCoffOffset);
 294   mTextOffset = mCoffOffset;
 295   SectionCount = 0;
 296   for (i = 0; i < mEhdr->e_shnum; i++) {
 297     Elf_Shdr *shdr = GetShdrByIndex(i);
 298     if (IsTextShdr(shdr)) {
 299       if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) {
 300         // the alignment field is valid
 301         if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) {
 302           // if the section address is aligned we must align PE/COFF
 303           mCoffOffset = (mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1);
 304         } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) {
 305           // ARM RVCT tools have behavior outside of the ELF specification to try
 306           // and make images smaller.  If sh_addr is not aligned to sh_addralign
 307           // then the section needs to preserve sh_addr MOD sh_addralign.
 308           // Normally doing nothing here works great.
 309           Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment.");
 310         }
 311       }
 312
 313       /* Relocate entry.  */
 314       if ((mEhdr->e_entry >= shdr->sh_addr) &&
 315           (mEhdr->e_entry < shdr->sh_addr + shdr->sh_size)) {
 316         CoffEntry = mCoffOffset + mEhdr->e_entry - shdr->sh_addr;
 317       }
 318       mCoffSectionsOffset[i] = mCoffOffset;
 319       mCoffOffset += shdr->sh_size;
 320       SectionCount ++;
 321     }
 322   }
 323
 324   if (mEhdr->e_machine != EM_ARM) {
 325     mCoffOffset = CoffAlign(mCoffOffset);
 326   }
 327
 328   if (SectionCount > 1 && mOutImageType == FW_EFI_IMAGE) {
 329     Warning (NULL, 0, 0, NULL, "Mulitple sections in %s are merged into 1 text section. Source level debug might not work correctly.", mInImageName);
 330   }
 331
 332   //
 333   //  Then data sections.
 334   //
 335   mDataOffset = mCoffOffset;
 336   SectionCount = 0;
 337   for (i = 0; i < mEhdr->e_shnum; i++) {
 338     Elf_Shdr *shdr = GetShdrByIndex(i);
 339     if (IsDataShdr(shdr)) {
 340       if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) {
 341         // the alignment field is valid
 342         if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) {
 343           // if the section address is aligned we must align PE/COFF
 344           mCoffOffset = (mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1);
 345         } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) {
 346           // ARM RVCT tools have behavior outside of the ELF specification to try
 347           // and make images smaller.  If sh_addr is not aligned to sh_addralign
 348           // then the section needs to preserve sh_addr MOD sh_addralign.
 349           // Normally doing nothing here works great.
 350           Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment.");
 351         }
 352       }
 353       mCoffSectionsOffset[i] = mCoffOffset;
 354       mCoffOffset += shdr->sh_size;
 355       SectionCount ++;
 356     }
 357   }
 358   mCoffOffset = CoffAlign(mCoffOffset);
 359
 360   if (SectionCount > 1 && mOutImageType == FW_EFI_IMAGE) {
 361     Warning (NULL, 0, 0, NULL, "Mulitple sections in %s are merged into 1 data section. Source level debug might not work correctly.", mInImageName);
 362   }
 363
 364   //
 365   //  The HII resource sections.
 366   //
 367   mHiiRsrcOffset = mCoffOffset;
 368   for (i = 0; i < mEhdr->e_shnum; i++) {
 369     Elf_Shdr *shdr = GetShdrByIndex(i);
 370     if (IsHiiRsrcShdr(shdr)) {
 371       if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) {
 372         // the alignment field is valid
 373         if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) {
 374           // if the section address is aligned we must align PE/COFF
 375           mCoffOffset = (mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1);
 376         } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) {
 377           // ARM RVCT tools have behavior outside of the ELF specification to try
 378           // and make images smaller.  If sh_addr is not aligned to sh_addralign
 379           // then the section needs to preserve sh_addr MOD sh_addralign.
 380           // Normally doing nothing here works great.
 381           Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment.");
 382         }
 383       }
 384       if (shdr->sh_size != 0) {
 385         mCoffSectionsOffset[i] = mCoffOffset;
 386         mCoffOffset += shdr->sh_size;
 387         mCoffOffset = CoffAlign(mCoffOffset);
 388         SetHiiResourceHeader ((UINT8*) mEhdr + shdr->sh_offset, mHiiRsrcOffset);
 389       }
 390       break;
 391     }
 392   }
 393
 394   mRelocOffset = mCoffOffset;
 395
 396   //
 397   // Allocate base Coff file.  Will be expanded later for relocations.
 398   //
 399   mCoffFile = (UINT8 *)malloc(mCoffOffset);
 400   memset(mCoffFile, 0, mCoffOffset);
 401
 402   //
 403   // Fill headers.
 404   //
 405   DosHdr = (EFI_IMAGE_DOS_HEADER *)mCoffFile;
 406   DosHdr->e_magic = EFI_IMAGE_DOS_SIGNATURE;
 407   DosHdr->e_lfanew = mNtHdrOffset;
 408
 409   NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION*)(mCoffFile + mNtHdrOffset);
 410
 411   NtHdr->Pe32.Signature = EFI_IMAGE_NT_SIGNATURE;
 412
 413   switch (mEhdr->e_machine) {
 414   case EM_386:
 415     NtHdr->Pe32.FileHeader.Machine = EFI_IMAGE_MACHINE_IA32;
 416     NtHdr->Pe32.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC;
 417     break;
 418   case EM_ARM:
 419     NtHdr->Pe32.FileHeader.Machine = EFI_IMAGE_MACHINE_ARMT;
 420     NtHdr->Pe32.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC;
 421     break;
 422   default:
 423     VerboseMsg ("%s unknown e_machine type. Assume IA-32", (UINTN)mEhdr->e_machine);
 424     NtHdr->Pe32.FileHeader.Machine = EFI_IMAGE_MACHINE_IA32;
 425     NtHdr->Pe32.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC;
 426   }
 427
 428   NtHdr->Pe32.FileHeader.NumberOfSections = mCoffNbrSections;
 429   NtHdr->Pe32.FileHeader.TimeDateStamp = (UINT32) time(NULL);
 430   mImageTimeStamp = NtHdr->Pe32.FileHeader.TimeDateStamp;
 431   NtHdr->Pe32.FileHeader.PointerToSymbolTable = 0;
 432   NtHdr->Pe32.FileHeader.NumberOfSymbols = 0;
 433   NtHdr->Pe32.FileHeader.SizeOfOptionalHeader = sizeof(NtHdr->Pe32.OptionalHeader);
 434   NtHdr->Pe32.FileHeader.Characteristics = EFI_IMAGE_FILE_EXECUTABLE_IMAGE
 435     | EFI_IMAGE_FILE_LINE_NUMS_STRIPPED
 436     | EFI_IMAGE_FILE_LOCAL_SYMS_STRIPPED
 437     | EFI_IMAGE_FILE_32BIT_MACHINE;
 438
 439   NtHdr->Pe32.OptionalHeader.SizeOfCode = mDataOffset - mTextOffset;
 440   NtHdr->Pe32.OptionalHeader.SizeOfInitializedData = mRelocOffset - mDataOffset;
 441   NtHdr->Pe32.OptionalHeader.SizeOfUninitializedData = 0;
 442   NtHdr->Pe32.OptionalHeader.AddressOfEntryPoint = CoffEntry;
 443
 444   NtHdr->Pe32.OptionalHeader.BaseOfCode = mTextOffset;
 445
 446   NtHdr->Pe32.OptionalHeader.BaseOfData = mDataOffset;
 447   NtHdr->Pe32.OptionalHeader.ImageBase = 0;
 448   NtHdr->Pe32.OptionalHeader.SectionAlignment = mCoffAlignment;
 449   NtHdr->Pe32.OptionalHeader.FileAlignment = mCoffAlignment;
 450   NtHdr->Pe32.OptionalHeader.SizeOfImage = 0;
 451
 452   NtHdr->Pe32.OptionalHeader.SizeOfHeaders = mTextOffset;
 453   NtHdr->Pe32.OptionalHeader.NumberOfRvaAndSizes = EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES;
 454
 455   //
 456   // Section headers.
 457   //
 458   if ((mDataOffset - mTextOffset) > 0) {
 459     CreateSectionHeader (".text", mTextOffset, mDataOffset - mTextOffset,
 460             EFI_IMAGE_SCN_CNT_CODE
 461             | EFI_IMAGE_SCN_MEM_EXECUTE
 462             | EFI_IMAGE_SCN_MEM_READ);
 463   } else {
 464     // Don't make a section of size 0.
 465     NtHdr->Pe32.FileHeader.NumberOfSections--;
 466   }
 467
 468   if ((mHiiRsrcOffset - mDataOffset) > 0) {
 469     CreateSectionHeader (".data", mDataOffset, mHiiRsrcOffset - mDataOffset,
 470             EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
 471             | EFI_IMAGE_SCN_MEM_WRITE
 472             | EFI_IMAGE_SCN_MEM_READ);
 473   } else {
 474     // Don't make a section of size 0.
 475     NtHdr->Pe32.FileHeader.NumberOfSections--;
 476   }
 477
 478   if ((mRelocOffset - mHiiRsrcOffset) > 0) {
 479     CreateSectionHeader (".rsrc", mHiiRsrcOffset, mRelocOffset - mHiiRsrcOffset,
 480             EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
 481             | EFI_IMAGE_SCN_MEM_READ);
 482
 483     NtHdr->Pe32.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_RESOURCE].Size = mRelocOffset - mHiiRsrcOffset;
 484     NtHdr->Pe32.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress = mHiiRsrcOffset;
 485   } else {
 486     // Don't make a section of size 0.
 487     NtHdr->Pe32.FileHeader.NumberOfSections--;
 488   }
 489
 490 }
 491
 492 STATIC
 493 BOOLEAN
 494 WriteSections32 (
 495   SECTION_FILTER_TYPES  FilterType
 496   )
 497 {
 498   UINT32      Idx;
 499   Elf_Shdr    *SecShdr;
 500   UINT32      SecOffset;
 501   BOOLEAN     (*Filter)(Elf_Shdr *);
 502
 503   //
 504   // Initialize filter pointer
 505   //
 506   switch (FilterType) {
 507     case SECTION_TEXT:
 508       Filter = IsTextShdr;
 509       break;
 510     case SECTION_HII:
 511       Filter = IsHiiRsrcShdr;
 512       break;
 513     case SECTION_DATA:
 514       Filter = IsDataShdr;
 515       break;
 516     default:
 517       return FALSE;
 518   }
 519
 520   //
 521   // First: copy sections.
 522   //
 523   for (Idx = 0; Idx < mEhdr->e_shnum; Idx++) {
 524     Elf_Shdr *Shdr = GetShdrByIndex(Idx);
 525     if ((*Filter)(Shdr)) {
 526       switch (Shdr->sh_type) {
 527       case SHT_PROGBITS:
 528         /* Copy.  */
 529         memcpy(mCoffFile + mCoffSectionsOffset[Idx],
 530               (UINT8*)mEhdr + Shdr->sh_offset,
 531               Shdr->sh_size);
 532         break;
 533
 534       case SHT_NOBITS:
 535         memset(mCoffFile + mCoffSectionsOffset[Idx], 0, Shdr->sh_size);
 536         break;
 537
 538       default:
 539         //
 540         //  Ignore for unkown section type.
 541         //
 542         VerboseMsg ("%s unknown section type %x. We directly copy this section into Coff file", mInImageName, (unsigned)Shdr->sh_type);
 543         break;
 544       }
 545     }
 546   }
 547
 548   //
 549   // Second: apply relocations.
 550   //
 551   for (Idx = 0; Idx < mEhdr->e_shnum; Idx++) {
 552     //
 553     // Determine if this is a relocation section.
 554     //
 555     Elf_Shdr *RelShdr = GetShdrByIndex(Idx);
 556     if ((RelShdr->sh_type != SHT_REL) && (RelShdr->sh_type != SHT_RELA)) {
 557       continue;
 558     }
 559
 560     //
 561     // Relocation section found.  Now extract section information that the relocations
 562     // apply to in the ELF data and the new COFF data.
 563     //
 564     SecShdr = GetShdrByIndex(RelShdr->sh_info);
 565     SecOffset = mCoffSectionsOffset[RelShdr->sh_info];
 566
 567     //
 568     // Only process relocations for the current filter type.
 569     //
 570     if (RelShdr->sh_type == SHT_REL && (*Filter)(SecShdr)) {
 571       UINT32 RelOffset;
 572
 573       //
 574       // Determine the symbol table referenced by the relocation data.
 575       //
 576       Elf_Shdr *SymtabShdr = GetShdrByIndex(RelShdr->sh_link);
 577       UINT8 *Symtab = (UINT8*)mEhdr + SymtabShdr->sh_offset;
 578
 579       //
 580       // Process all relocation entries for this section.
 581       //
 582       for (RelOffset = 0; RelOffset < RelShdr->sh_size; RelOffset += RelShdr->sh_entsize) {
 583         //
 584         // Set pointer to relocation entry
 585         //
 586         Elf_Rel *Rel = (Elf_Rel *)((UINT8*)mEhdr + RelShdr->sh_offset + RelOffset);
 587
 588         //
 589         // Set pointer to symbol table entry associated with the relocation entry.
 590         //
 591         Elf_Sym *Sym = (Elf_Sym *)(Symtab + ELF_R_SYM(Rel->r_info) * SymtabShdr->sh_entsize);
 592
 593         Elf_Shdr *SymShdr;
 594         UINT8 *Targ;
 595         UINT16 Address;
 596
 597         //
 598         // Check section header index found in symbol table and get the section
 599         // header location.
 600         //
 601         if (Sym->st_shndx == SHN_UNDEF
 602             || Sym->st_shndx == SHN_ABS
 603             || Sym->st_shndx > mEhdr->e_shnum) {
 604           Error (NULL, 0, 3000, "Invalid", "%s bad symbol definition.", mInImageName);
 605         }
 606         SymShdr = GetShdrByIndex(Sym->st_shndx);
 607
 608         //
 609         // Convert the relocation data to a pointer into the coff file.
 610         //
 611         // Note:
 612         //   r_offset is the virtual address of the storage unit to be relocated.
 613         //   sh_addr is the virtual address for the base of the section.
 614         //
 615         Targ = mCoffFile + SecOffset + (Rel->r_offset - SecShdr->sh_addr);
 616
 617         //
 618         // Determine how to handle each relocation type based on the machine type.
 619         //
 620         if (mEhdr->e_machine == EM_386) {
 621           switch (ELF_R_TYPE(Rel->r_info)) {
 622           case R_386_NONE:
 623             break;
 624           case R_386_32:
 625             //
 626             // Absolute relocation.
 627             //  Converts Targ from a absolute virtual address to the absolute
 628             //  COFF address.
 629             //
 630             *(UINT32 *)Targ = *(UINT32 *)Targ - SymShdr->sh_addr
 631               + mCoffSectionsOffset[Sym->st_shndx];
 632             break;
 633           case R_386_PC32:
 634             //
 635             // Relative relocation: Symbol - Ip + Addend
 636             //
 637             *(UINT32 *)Targ = *(UINT32 *)Targ
 638               + (mCoffSectionsOffset[Sym->st_shndx] - SymShdr->sh_addr)
 639               - (SecOffset - SecShdr->sh_addr);
 640             break;
 641           default:
 642             Error (NULL, 0, 3000, "Invalid", "%s unsupported ELF EM_386 relocation 0x%x.", mInImageName, (unsigned) ELF_R_TYPE(Rel->r_info));
 643           }
 644         } else if (mEhdr->e_machine == EM_ARM) {
 645           switch (ELF32_R_TYPE(Rel->r_info)) {
 646           case R_ARM_RBASE:
 647             // No relocation - no action required
 648             // break skipped
 649
 650           case R_ARM_PC24:
 651           case R_ARM_XPC25:
 652           case R_ARM_THM_PC22:
 653           case R_ARM_THM_JUMP19:
 654           case R_ARM_CALL:
 655           case R_ARM_JMP24:
 656           case R_ARM_THM_JUMP24:
 657           case R_ARM_PREL31:
 658           case R_ARM_MOVW_PREL_NC:
 659           case R_ARM_MOVT_PREL:
 660           case R_ARM_THM_MOVW_PREL_NC:
 661           case R_ARM_THM_MOVT_PREL:
 662           case R_ARM_THM_JMP6:
 663           case R_ARM_THM_ALU_PREL_11_0:
 664           case R_ARM_THM_PC12:
 665           case R_ARM_REL32_NOI:
 666           case R_ARM_ALU_PC_G0_NC:
 667           case R_ARM_ALU_PC_G0:
 668           case R_ARM_ALU_PC_G1_NC:
 669           case R_ARM_ALU_PC_G1:
 670           case R_ARM_ALU_PC_G2:
 671           case R_ARM_LDR_PC_G1:
 672           case R_ARM_LDR_PC_G2:
 673           case R_ARM_LDRS_PC_G0:
 674           case R_ARM_LDRS_PC_G1:
 675           case R_ARM_LDRS_PC_G2:
 676           case R_ARM_LDC_PC_G0:
 677           case R_ARM_LDC_PC_G1:
 678           case R_ARM_LDC_PC_G2:
 679           case R_ARM_GOT_PREL:
 680           case R_ARM_THM_JUMP11:
 681           case R_ARM_THM_JUMP8:
 682           case R_ARM_TLS_GD32:
 683           case R_ARM_TLS_LDM32:
 684           case R_ARM_TLS_IE32:
 685             // Thease are all PC-relative relocations and don't require modification
 686             // GCC does not seem to have the concept of a application that just needs to get relocated.
 687             break;
 688
 689           case R_ARM_THM_MOVW_ABS_NC:
 690             // MOVW is only lower 16-bits of the addres
 691             Address = (UINT16)(Sym->st_value - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx]);
 692             ThumbMovtImmediatePatch ((UINT16 *)Targ, Address);
 693             break;
 694
 695           case R_ARM_THM_MOVT_ABS:
 696             // MOVT is only upper 16-bits of the addres
 697             Address = (UINT16)((Sym->st_value - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx]) >> 16);
 698             ThumbMovtImmediatePatch ((UINT16 *)Targ, Address);
 699             break;
 700
 701           case R_ARM_ABS32:
 702           case R_ARM_RABS32:
 703             //
 704             // Absolute relocation.
 705             //
 706             *(UINT32 *)Targ = *(UINT32 *)Targ - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx];
 707             break;
 708
 709           default:
 710             Error (NULL, 0, 3000, "Invalid", "WriteSections (): %s unsupported ELF EM_ARM relocation 0x%x.", mInImageName, (unsigned) ELF32_R_TYPE(Rel->r_info));
 711           }
 712         }
 713       }
 714     }
 715   }
 716
 717   return TRUE;
 718 }
 719
 720 UINTN gMovwOffset = 0;
 721
 722 STATIC
 723 VOID
 724 WriteRelocations32 (
 725   VOID
 726   )
 727 {
 728   UINT32                           Index;
 729   EFI_IMAGE_OPTIONAL_HEADER_UNION  *NtHdr;
 730   EFI_IMAGE_DATA_DIRECTORY         *Dir;
 731   BOOLEAN                          FoundRelocations;
 732   Elf_Dyn                          *Dyn;
 733   Elf_Rel                          *Rel;
 734   UINTN                            RelElementSize;
 735   UINTN                            RelSize;
 736   UINTN                            RelOffset;
 737   UINTN                            K;
 738   UINT8                            *Targ;
 739   Elf32_Phdr                       *DynamicSegment;
 740   Elf32_Phdr                       *TargetSegment;
 741
 742   for (Index = 0, FoundRelocations = FALSE; Index < mEhdr->e_shnum; Index++) {
 743     Elf_Shdr *RelShdr = GetShdrByIndex(Index);
 744     if ((RelShdr->sh_type == SHT_REL) || (RelShdr->sh_type == SHT_RELA)) {
 745       Elf_Shdr *SecShdr = GetShdrByIndex (RelShdr->sh_info);
 746       if (IsTextShdr(SecShdr) || IsDataShdr(SecShdr)) {
 747         UINT32 RelIdx;
 748
 749         FoundRelocations = TRUE;
 750         for (RelIdx = 0; RelIdx < RelShdr->sh_size; RelIdx += RelShdr->sh_entsize) {
 751           Elf_Rel  *Rel = (Elf_Rel *)((UINT8*)mEhdr + RelShdr->sh_offset + RelIdx);
 752
 753           if (mEhdr->e_machine == EM_386) {
 754             switch (ELF_R_TYPE(Rel->r_info)) {
 755             case R_386_NONE:
 756             case R_386_PC32:
 757               //
 758               // No fixup entry required.
 759               //
 760               break;
 761             case R_386_32:
 762               //
 763               // Creates a relative relocation entry from the absolute entry.
 764               //
 765               CoffAddFixup(mCoffSectionsOffset[RelShdr->sh_info]
 766               + (Rel->r_offset - SecShdr->sh_addr),
 767               EFI_IMAGE_REL_BASED_HIGHLOW);
 768               break;
 769             default:
 770               Error (NULL, 0, 3000, "Invalid", "%s unsupported ELF EM_386 relocation 0x%x.", mInImageName, (unsigned) ELF_R_TYPE(Rel->r_info));
 771             }
 772           } else if (mEhdr->e_machine == EM_ARM) {
 773             switch (ELF32_R_TYPE(Rel->r_info)) {
 774             case R_ARM_RBASE:
 775               // No relocation - no action required
 776               // break skipped
 777
 778             case R_ARM_PC24:
 779             case R_ARM_XPC25:
 780             case R_ARM_THM_PC22:
 781             case R_ARM_THM_JUMP19:
 782             case R_ARM_CALL:
 783             case R_ARM_JMP24:
 784             case R_ARM_THM_JUMP24:
 785             case R_ARM_PREL31:
 786             case R_ARM_MOVW_PREL_NC:
 787             case R_ARM_MOVT_PREL:
 788             case R_ARM_THM_MOVW_PREL_NC:
 789             case R_ARM_THM_MOVT_PREL:
 790             case R_ARM_THM_JMP6:
 791             case R_ARM_THM_ALU_PREL_11_0:
 792             case R_ARM_THM_PC12:
 793             case R_ARM_REL32_NOI:
 794             case R_ARM_ALU_PC_G0_NC:
 795             case R_ARM_ALU_PC_G0:
 796             case R_ARM_ALU_PC_G1_NC:
 797             case R_ARM_ALU_PC_G1:
 798             case R_ARM_ALU_PC_G2:
 799             case R_ARM_LDR_PC_G1:
 800             case R_ARM_LDR_PC_G2:
 801             case R_ARM_LDRS_PC_G0:
 802             case R_ARM_LDRS_PC_G1:
 803             case R_ARM_LDRS_PC_G2:
 804             case R_ARM_LDC_PC_G0:
 805             case R_ARM_LDC_PC_G1:
 806             case R_ARM_LDC_PC_G2:
 807             case R_ARM_GOT_PREL:
 808             case R_ARM_THM_JUMP11:
 809             case R_ARM_THM_JUMP8:
 810             case R_ARM_TLS_GD32:
 811             case R_ARM_TLS_LDM32:
 812             case R_ARM_TLS_IE32:
 813               // Thease are all PC-relative relocations and don't require modification
 814               break;
 815
 816             case R_ARM_THM_MOVW_ABS_NC:
 817               CoffAddFixup (
 818                 mCoffSectionsOffset[RelShdr->sh_info]
 819                 + (Rel->r_offset - SecShdr->sh_addr),
 820                 EFI_IMAGE_REL_BASED_ARM_MOV32T
 821                 );
 822
 823               // PE/COFF treats MOVW/MOVT relocation as single 64-bit instruction
 824               // Track this address so we can log an error for unsupported sequence of MOVW/MOVT
 825               gMovwOffset = mCoffSectionsOffset[RelShdr->sh_info] + (Rel->r_offset - SecShdr->sh_addr);
 826               break;
 827
 828             case R_ARM_THM_MOVT_ABS:
 829               if ((gMovwOffset + 4) !=  (mCoffSectionsOffset[RelShdr->sh_info] + (Rel->r_offset - SecShdr->sh_addr))) {
 830                 Error (NULL, 0, 3000, "Not Supported", "PE/COFF requires MOVW+MOVT instruction sequence %x +4 != %x.", gMovwOffset, mCoffSectionsOffset[RelShdr->sh_info] + (Rel->r_offset - SecShdr->sh_addr));
 831               }
 832               break;
 833
 834             case R_ARM_ABS32:
 835             case R_ARM_RABS32:
 836               CoffAddFixup (
 837                 mCoffSectionsOffset[RelShdr->sh_info]
 838                 + (Rel->r_offset - SecShdr->sh_addr),
 839                 EFI_IMAGE_REL_BASED_HIGHLOW
 840                 );
 841               break;
 842
 843            default:
 844               Error (NULL, 0, 3000, "Invalid", "WriteRelocations(): %s unsupported ELF EM_ARM relocation 0x%x.", mInImageName, (unsigned) ELF32_R_TYPE(Rel->r_info));
 845             }
 846           } else {
 847             Error (NULL, 0, 3000, "Not Supported", "This tool does not support relocations for ELF with e_machine %u (processor type).", (unsigned) mEhdr->e_machine);
 848           }
 849         }
 850       }
 851     }
 852   }
 853
 854   if (!FoundRelocations && (mEhdr->e_machine == EM_ARM)) {
 855     /* Try again, but look for PT_DYNAMIC instead of SHT_REL */
 856
 857     for (Index = 0; Index < mEhdr->e_phnum; Index++) {
 858       RelElementSize = 0;
 859       RelSize = 0;
 860       RelOffset = 0;
 861
 862       DynamicSegment = GetPhdrByIndex (Index);
 863
 864       if (DynamicSegment->p_type == PT_DYNAMIC) {
 865         Dyn = (Elf32_Dyn *) ((UINT8 *)mEhdr + DynamicSegment->p_offset);
 866
 867         while (Dyn->d_tag != DT_NULL) {
 868           switch (Dyn->d_tag) {
 869             case  DT_REL:
 870               RelOffset = Dyn->d_un.d_val;
 871               break;
 872
 873             case  DT_RELSZ:
 874               RelSize = Dyn->d_un.d_val;
 875               break;
 876
 877             case  DT_RELENT:
 878               RelElementSize = Dyn->d_un.d_val;
 879               break;
 880
 881             default:
 882               break;
 883           }
 884           Dyn++;
 885         }
 886         if (( RelOffset == 0 ) || ( RelSize == 0 ) || ( RelElementSize == 0 )) {
 887           Error (NULL, 0, 3000, "Invalid", "%s bad ARM dynamic relocations.", mInImageName);
 888         }
 889
 890         for (K = 0; K < RelSize; K += RelElementSize) {
 891
 892           if (DynamicSegment->p_paddr == 0) {
 893             // Older versions of the ARM ELF (SWS ESPC 0003 B-02) specification define DT_REL
 894             // as an offset in the dynamic segment. p_paddr is defined to be zero for ARM tools
 895             Rel = (Elf32_Rel *) ((UINT8 *) mEhdr + DynamicSegment->p_offset + RelOffset + K);
 896           } else {
 897             // This is how it reads in the generic ELF specification
 898             Rel = (Elf32_Rel *) ((UINT8 *) mEhdr + RelOffset + K);
 899           }
 900
 901           switch (ELF32_R_TYPE (Rel->r_info)) {
 902           case  R_ARM_RBASE:
 903             break;
 904
 905           case  R_ARM_RABS32:
 906             TargetSegment = GetPhdrByIndex (ELF32_R_SYM (Rel->r_info) - 1);
 907
 908             // Note: r_offset in a memory address.  Convert it to a pointer in the coff file.
 909             Targ = mCoffFile + mCoffSectionsOffset[ ELF32_R_SYM( Rel->r_info ) ] + Rel->r_offset - TargetSegment->p_vaddr;
 910
 911             *(UINT32 *)Targ = *(UINT32 *)Targ + mCoffSectionsOffset [ELF32_R_SYM( Rel->r_info )];
 912
 913             CoffAddFixup (mCoffSectionsOffset[ELF32_R_SYM (Rel->r_info)] + (Rel->r_offset - TargetSegment->p_vaddr), EFI_IMAGE_REL_BASED_HIGHLOW);
 914             break;
 915
 916           default:
 917             Error (NULL, 0, 3000, "Invalid", "%s bad ARM dynamic relocations, unkown type %d.", mInImageName, ELF32_R_TYPE (Rel->r_info));
 918             break;
 919           }
 920         }
 921         break;
 922       }
 923     }
 924   }
 925
 926   //
 927   // Pad by adding empty entries.
 928   //
 929   while (mCoffOffset & (mCoffAlignment - 1)) {
 930     CoffAddFixupEntry(0);
 931   }
 932
 933   NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset);
 934   Dir = &NtHdr->Pe32.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC];
 935   Dir->Size = mCoffOffset - mRelocOffset;
 936   if (Dir->Size == 0) {
 937     // If no relocations, null out the directory entry and don't add the .reloc section
 938     Dir->VirtualAddress = 0;
 939     NtHdr->Pe32.FileHeader.NumberOfSections--;
 940   } else {
 941     Dir->VirtualAddress = mRelocOffset;
 942     CreateSectionHeader (".reloc", mRelocOffset, mCoffOffset - mRelocOffset,
 943             EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
 944             | EFI_IMAGE_SCN_MEM_DISCARDABLE
 945             | EFI_IMAGE_SCN_MEM_READ);
 946   }
 947
 948 }
 949
 950 STATIC
 951 VOID
 952 WriteDebug32 (
 953   VOID
 954   )
 955 {
 956   UINT32                              Len;
 957   UINT32                              DebugOffset;
 958   EFI_IMAGE_OPTIONAL_HEADER_UNION     *NtHdr;
 959   EFI_IMAGE_DATA_DIRECTORY            *DataDir;
 960   EFI_IMAGE_DEBUG_DIRECTORY_ENTRY     *Dir;
 961   EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY *Nb10;
 962
 963   Len = strlen(mInImageName) + 1;
 964   DebugOffset = mCoffOffset;
 965
 966   mCoffOffset += sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY)
 967     + sizeof(EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY)
 968     + Len;
 969   mCoffOffset = CoffAlign(mCoffOffset);
 970
 971   mCoffFile = realloc(mCoffFile, mCoffOffset);
 972   memset(mCoffFile + DebugOffset, 0, mCoffOffset - DebugOffset);
 973
 974   Dir = (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY*)(mCoffFile + DebugOffset);
 975   Dir->Type = EFI_IMAGE_DEBUG_TYPE_CODEVIEW;
 976   Dir->SizeOfData = sizeof(EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY) + Len;
 977   Dir->RVA = DebugOffset + sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY);
 978   Dir->FileOffset = DebugOffset + sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY);
 979
 980   Nb10 = (EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY*)(Dir + 1);
 981   Nb10->Signature = CODEVIEW_SIGNATURE_NB10;
 982   strcpy ((char *)(Nb10 + 1), mInImageName);
 983
 984
 985   NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset);
 986   DataDir = &NtHdr->Pe32.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG];
 987   DataDir->VirtualAddress = DebugOffset;
 988   DataDir->Size = mCoffOffset - DebugOffset;
 989   if (DataDir->Size == 0) {
 990     // If no debug, null out the directory entry and don't add the .debug section
 991     DataDir->VirtualAddress = 0;
 992     NtHdr->Pe32.FileHeader.NumberOfSections--;
 993   } else {
 994     DataDir->VirtualAddress = DebugOffset;
 995     CreateSectionHeader (".debug", DebugOffset, mCoffOffset - DebugOffset,
 996             EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
 997             | EFI_IMAGE_SCN_MEM_DISCARDABLE
 998             | EFI_IMAGE_SCN_MEM_READ);
 999
1000   }
1001 }
1002
1003 STATIC
1004 VOID
1005 SetImageSize32 (
1006   VOID
1007   )
1008 {
1009   EFI_IMAGE_OPTIONAL_HEADER_UNION *NtHdr;
1010
1011   //
1012   // Set image size
1013   //
1014   NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset);
1015   NtHdr->Pe32.OptionalHeader.SizeOfImage = mCoffOffset;
1016 }
1017
1018 STATIC
1019 VOID
1020 CleanUp32 (
1021   VOID
1022   )
1023 {
1024   if (mCoffSectionsOffset != NULL) {
1025     free (mCoffSectionsOffset);
1026   }
1027 }
1028
1029