diff options
Diffstat (limited to 'BaseTools/Source/C/GenFw/Elf32Convert.c')
| -rw-r--r-- | BaseTools/Source/C/GenFw/Elf32Convert.c | 964 |
1 files changed, 964 insertions, 0 deletions
diff --git a/BaseTools/Source/C/GenFw/Elf32Convert.c b/BaseTools/Source/C/GenFw/Elf32Convert.c new file mode 100644 index 0000000000..9e4a9a2c9a --- /dev/null +++ b/BaseTools/Source/C/GenFw/Elf32Convert.c @@ -0,0 +1,964 @@ +/** @file + +Copyright (c) 2010, Intel Corporation. All rights reserved.<BR> + +This program and the accompanying materials are licensed and made available +under the terms and conditions of the BSD License which accompanies this +distribution. The full text of the license may be found at +http://opensource.org/licenses/bsd-license.php + +THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +#include "WinNtInclude.h" + +#ifndef __GNUC__ +#include <windows.h> +#include <io.h> +#endif +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <ctype.h> + +#include <Common/UefiBaseTypes.h> +#include <IndustryStandard/PeImage.h> + +#include "PeCoffLib.h" +#include "EfiUtilityMsgs.h" + +#include "GenFw.h" +#include "ElfConvert.h" +#include "Elf32Convert.h" + +STATIC +VOID +ScanSections32 ( + VOID + ); + +STATIC +BOOLEAN +WriteSections32 ( + SECTION_FILTER_TYPES FilterType + ); + +STATIC +VOID +WriteRelocations32 ( + VOID + ); + +STATIC +VOID +WriteDebug32 ( + VOID + ); + +STATIC +VOID +SetImageSize32 ( + VOID + ); + +STATIC +VOID +CleanUp32 ( + VOID + ); + +// +// Rename ELF32 strucutres to common names to help when porting to ELF64. +// +typedef Elf32_Shdr Elf_Shdr; +typedef Elf32_Ehdr Elf_Ehdr; +typedef Elf32_Rel Elf_Rel; +typedef Elf32_Sym Elf_Sym; +typedef Elf32_Phdr Elf_Phdr; +typedef Elf32_Dyn Elf_Dyn; +#define ELFCLASS ELFCLASS32 +#define ELF_R_TYPE(r) ELF32_R_TYPE(r) +#define ELF_R_SYM(r) ELF32_R_SYM(r) + +// +// Well known ELF structures. +// +STATIC Elf_Ehdr *mEhdr; +STATIC Elf_Shdr *mShdrBase; +STATIC Elf_Phdr *mPhdrBase; + +// +// Coff information +// +STATIC const UINT32 mCoffAlignment = 0x20; + +// +// PE section alignment. +// +STATIC const UINT16 mCoffNbrSections = 5; + +// +// ELF sections to offset in Coff file. +// +STATIC UINT32 *mCoffSectionsOffset = NULL; + +// +// Offsets in COFF file +// +STATIC UINT32 mNtHdrOffset; +STATIC UINT32 mTextOffset; +STATIC UINT32 mDataOffset; +STATIC UINT32 mHiiRsrcOffset; +STATIC UINT32 mRelocOffset; + +// +// Initialization Function +// +BOOLEAN +InitializeElf32 ( + UINT8 *FileBuffer, + ELF_FUNCTION_TABLE *ElfFunctions + ) +{ + // + // Initialize data pointer and structures. + // + mEhdr = (Elf_Ehdr*) FileBuffer; + + // + // Check the ELF32 specific header information. + // + if (mEhdr->e_ident[EI_CLASS] != ELFCLASS32) { + Error (NULL, 0, 3000, "Unsupported", "ELF EI_DATA not ELFCLASS32"); + return FALSE; + } + if (mEhdr->e_ident[EI_DATA] != ELFDATA2LSB) { + Error (NULL, 0, 3000, "Unsupported", "ELF EI_DATA not ELFDATA2LSB"); + return FALSE; + } + if ((mEhdr->e_type != ET_EXEC) && (mEhdr->e_type != ET_DYN)) { + Error (NULL, 0, 3000, "Unsupported", "ELF e_type not ET_EXEC or ET_DYN"); + return FALSE; + } + if (!((mEhdr->e_machine == EM_386) || (mEhdr->e_machine == EM_ARM))) { + Error (NULL, 0, 3000, "Unsupported", "ELF e_machine not EM_386 or EM_ARM"); + return FALSE; + } + if (mEhdr->e_version != EV_CURRENT) { + Error (NULL, 0, 3000, "Unsupported", "ELF e_version (%u) not EV_CURRENT (%d)", (unsigned) mEhdr->e_version, EV_CURRENT); + return FALSE; + } + + // + // Update section header pointers + // + mShdrBase = (Elf_Shdr *)((UINT8 *)mEhdr + mEhdr->e_shoff); + mPhdrBase = (Elf_Phdr *)((UINT8 *)mEhdr + mEhdr->e_phoff); + + // + // Create COFF Section offset buffer and zero. + // + mCoffSectionsOffset = (UINT32 *)malloc(mEhdr->e_shnum * sizeof (UINT32)); + memset(mCoffSectionsOffset, 0, mEhdr->e_shnum * sizeof(UINT32)); + + // + // Fill in function pointers. + // + ElfFunctions->ScanSections = ScanSections32; + ElfFunctions->WriteSections = WriteSections32; + ElfFunctions->WriteRelocations = WriteRelocations32; + ElfFunctions->WriteDebug = WriteDebug32; + ElfFunctions->SetImageSize = SetImageSize32; + ElfFunctions->CleanUp = CleanUp32; + + return TRUE; +} + + +// +// Header by Index functions +// +STATIC +Elf_Shdr* +GetShdrByIndex ( + UINT32 Num + ) +{ + if (Num >= mEhdr->e_shnum) + return NULL; + return (Elf_Shdr*)((UINT8*)mShdrBase + Num * mEhdr->e_shentsize); +} + +STATIC +Elf_Phdr* +GetPhdrByIndex ( + UINT32 num + ) +{ + if (num >= mEhdr->e_phnum) { + return NULL; + } + + return (Elf_Phdr *)((UINT8*)mPhdrBase + num * mEhdr->e_phentsize); +} + +STATIC +UINT32 +CoffAlign ( + UINT32 Offset + ) +{ + return (Offset + mCoffAlignment - 1) & ~(mCoffAlignment - 1); +} + +// +// filter functions +// +STATIC +BOOLEAN +IsTextShdr ( + Elf_Shdr *Shdr + ) +{ + return (BOOLEAN) ((Shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) == SHF_ALLOC); +} + +STATIC +BOOLEAN +IsHiiRsrcShdr ( + Elf_Shdr *Shdr + ) +{ + Elf_Shdr *Namedr = GetShdrByIndex(mEhdr->e_shstrndx); + + return (BOOLEAN) (strcmp((CHAR8*)mEhdr + Namedr->sh_offset + Shdr->sh_name, ELF_HII_SECTION_NAME) == 0); +} + +STATIC +BOOLEAN +IsDataShdr ( + Elf_Shdr *Shdr + ) +{ + if (IsHiiRsrcShdr(Shdr)) { + return FALSE; + } + return (BOOLEAN) (Shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) == (SHF_ALLOC | SHF_WRITE); +} + +// +// Elf functions interface implementation +// + +STATIC +VOID +ScanSections32 ( + VOID + ) +{ + UINT32 i; + EFI_IMAGE_DOS_HEADER *DosHdr; + EFI_IMAGE_OPTIONAL_HEADER_UNION *NtHdr; + UINT32 CoffEntry; + + CoffEntry = 0; + mCoffOffset = 0; + + // + // Coff file start with a DOS header. + // + mCoffOffset = sizeof(EFI_IMAGE_DOS_HEADER) + 0x40; + mNtHdrOffset = mCoffOffset; + switch (mEhdr->e_machine) { + case EM_386: + case EM_ARM: + mCoffOffset += sizeof (EFI_IMAGE_NT_HEADERS32); + break; + default: + VerboseMsg ("%s unknown e_machine type. Assume IA-32", (UINTN)mEhdr->e_machine); + mCoffOffset += sizeof (EFI_IMAGE_NT_HEADERS32); + break; + } + + mTableOffset = mCoffOffset; + mCoffOffset += mCoffNbrSections * sizeof(EFI_IMAGE_SECTION_HEADER); + + // + // First text sections. + // + mCoffOffset = CoffAlign(mCoffOffset); + mTextOffset = mCoffOffset; + for (i = 0; i < mEhdr->e_shnum; i++) { + Elf_Shdr *shdr = GetShdrByIndex(i); + if (IsTextShdr(shdr)) { + if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) { + // the alignment field is valid + if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) { + // if the section address is aligned we must align PE/COFF + mCoffOffset = (mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1); + } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) { + // ARM RVCT tools have behavior outside of the ELF specification to try + // and make images smaller. If sh_addr is not aligned to sh_addralign + // then the section needs to preserve sh_addr MOD sh_addralign. + // Normally doing nothing here works great. + Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment."); + } + } + + /* Relocate entry. */ + if ((mEhdr->e_entry >= shdr->sh_addr) && + (mEhdr->e_entry < shdr->sh_addr + shdr->sh_size)) { + CoffEntry = mCoffOffset + mEhdr->e_entry - shdr->sh_addr; + } + mCoffSectionsOffset[i] = mCoffOffset; + mCoffOffset += shdr->sh_size; + } + } + + if (mEhdr->e_machine != EM_ARM) { + mCoffOffset = CoffAlign(mCoffOffset); + } + + // + // Then data sections. + // + mDataOffset = mCoffOffset; + for (i = 0; i < mEhdr->e_shnum; i++) { + Elf_Shdr *shdr = GetShdrByIndex(i); + if (IsDataShdr(shdr)) { + if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) { + // the alignment field is valid + if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) { + // if the section address is aligned we must align PE/COFF + mCoffOffset = (mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1); + } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) { + // ARM RVCT tools have behavior outside of the ELF specification to try + // and make images smaller. If sh_addr is not aligned to sh_addralign + // then the section needs to preserve sh_addr MOD sh_addralign. + // Normally doing nothing here works great. + Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment."); + } + } + mCoffSectionsOffset[i] = mCoffOffset; + mCoffOffset += shdr->sh_size; + } + } + mCoffOffset = CoffAlign(mCoffOffset); + + // + // The HII resource sections. + // + mHiiRsrcOffset = mCoffOffset; + for (i = 0; i < mEhdr->e_shnum; i++) { + Elf_Shdr *shdr = GetShdrByIndex(i); + if (IsHiiRsrcShdr(shdr)) { + if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) { + // the alignment field is valid + if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) { + // if the section address is aligned we must align PE/COFF + mCoffOffset = (mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1); + } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) { + // ARM RVCT tools have behavior outside of the ELF specification to try + // and make images smaller. If sh_addr is not aligned to sh_addralign + // then the section needs to preserve sh_addr MOD sh_addralign. + // Normally doing nothing here works great. + Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment."); + } + } + if (shdr->sh_size != 0) { + mCoffSectionsOffset[i] = mCoffOffset; + mCoffOffset += shdr->sh_size; + mCoffOffset = CoffAlign(mCoffOffset); + SetHiiResourceHeader ((UINT8*) mEhdr + shdr->sh_offset, mHiiRsrcOffset); + } + break; + } + } + + mRelocOffset = mCoffOffset; + + // + // Allocate base Coff file. Will be expanded later for relocations. + // + mCoffFile = (UINT8 *)malloc(mCoffOffset); + memset(mCoffFile, 0, mCoffOffset); + + // + // Fill headers. + // + DosHdr = (EFI_IMAGE_DOS_HEADER *)mCoffFile; + DosHdr->e_magic = EFI_IMAGE_DOS_SIGNATURE; + DosHdr->e_lfanew = mNtHdrOffset; + + NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION*)(mCoffFile + mNtHdrOffset); + + NtHdr->Pe32.Signature = EFI_IMAGE_NT_SIGNATURE; + + switch (mEhdr->e_machine) { + case EM_386: + NtHdr->Pe32.FileHeader.Machine = EFI_IMAGE_MACHINE_IA32; + NtHdr->Pe32.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC; + break; + case EM_ARM: + NtHdr->Pe32.FileHeader.Machine = EFI_IMAGE_MACHINE_ARMT; + NtHdr->Pe32.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC; + break; + default: + VerboseMsg ("%s unknown e_machine type. Assume IA-32", (UINTN)mEhdr->e_machine); + NtHdr->Pe32.FileHeader.Machine = EFI_IMAGE_MACHINE_IA32; + NtHdr->Pe32.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC; + } + + NtHdr->Pe32.FileHeader.NumberOfSections = mCoffNbrSections; + NtHdr->Pe32.FileHeader.TimeDateStamp = (UINT32) time(NULL); + mImageTimeStamp = NtHdr->Pe32.FileHeader.TimeDateStamp; + NtHdr->Pe32.FileHeader.PointerToSymbolTable = 0; + NtHdr->Pe32.FileHeader.NumberOfSymbols = 0; + NtHdr->Pe32.FileHeader.SizeOfOptionalHeader = sizeof(NtHdr->Pe32.OptionalHeader); + NtHdr->Pe32.FileHeader.Characteristics = EFI_IMAGE_FILE_EXECUTABLE_IMAGE + | EFI_IMAGE_FILE_LINE_NUMS_STRIPPED + | EFI_IMAGE_FILE_LOCAL_SYMS_STRIPPED + | EFI_IMAGE_FILE_32BIT_MACHINE; + + NtHdr->Pe32.OptionalHeader.SizeOfCode = mDataOffset - mTextOffset; + NtHdr->Pe32.OptionalHeader.SizeOfInitializedData = mRelocOffset - mDataOffset; + NtHdr->Pe32.OptionalHeader.SizeOfUninitializedData = 0; + NtHdr->Pe32.OptionalHeader.AddressOfEntryPoint = CoffEntry; + + NtHdr->Pe32.OptionalHeader.BaseOfCode = mTextOffset; + + NtHdr->Pe32.OptionalHeader.BaseOfData = mDataOffset; + NtHdr->Pe32.OptionalHeader.ImageBase = 0; + NtHdr->Pe32.OptionalHeader.SectionAlignment = mCoffAlignment; + NtHdr->Pe32.OptionalHeader.FileAlignment = mCoffAlignment; + NtHdr->Pe32.OptionalHeader.SizeOfImage = 0; + + NtHdr->Pe32.OptionalHeader.SizeOfHeaders = mTextOffset; + NtHdr->Pe32.OptionalHeader.NumberOfRvaAndSizes = EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES; + + // + // Section headers. + // + if ((mDataOffset - mTextOffset) > 0) { + CreateSectionHeader (".text", mTextOffset, mDataOffset - mTextOffset, + EFI_IMAGE_SCN_CNT_CODE + | EFI_IMAGE_SCN_MEM_EXECUTE + | EFI_IMAGE_SCN_MEM_READ); + } else { + // Don't make a section of size 0. + NtHdr->Pe32.FileHeader.NumberOfSections--; + } + + if ((mHiiRsrcOffset - mDataOffset) > 0) { + CreateSectionHeader (".data", mDataOffset, mHiiRsrcOffset - mDataOffset, + EFI_IMAGE_SCN_CNT_INITIALIZED_DATA + | EFI_IMAGE_SCN_MEM_WRITE + | EFI_IMAGE_SCN_MEM_READ); + } else { + // Don't make a section of size 0. + NtHdr->Pe32.FileHeader.NumberOfSections--; + } + + if ((mRelocOffset - mHiiRsrcOffset) > 0) { + CreateSectionHeader (".rsrc", mHiiRsrcOffset, mRelocOffset - mHiiRsrcOffset, + EFI_IMAGE_SCN_CNT_INITIALIZED_DATA + | EFI_IMAGE_SCN_MEM_READ); + + NtHdr->Pe32.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_RESOURCE].Size = mRelocOffset - mHiiRsrcOffset; + NtHdr->Pe32.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress = mHiiRsrcOffset; + } else { + // Don't make a section of size 0. + NtHdr->Pe32.FileHeader.NumberOfSections--; + } + +} + +STATIC +BOOLEAN +WriteSections32 ( + SECTION_FILTER_TYPES FilterType + ) +{ + UINT32 Idx; + Elf_Shdr *SecShdr; + UINT32 SecOffset; + BOOLEAN (*Filter)(Elf_Shdr *); + + // + // Initialize filter pointer + // + switch (FilterType) { + case SECTION_TEXT: + Filter = IsTextShdr; + break; + case SECTION_HII: + Filter = IsHiiRsrcShdr; + break; + case SECTION_DATA: + Filter = IsDataShdr; + break; + default: + return FALSE; + } + + // + // First: copy sections. + // + for (Idx = 0; Idx < mEhdr->e_shnum; Idx++) { + Elf_Shdr *Shdr = GetShdrByIndex(Idx); + if ((*Filter)(Shdr)) { + switch (Shdr->sh_type) { + case SHT_PROGBITS: + /* Copy. */ + memcpy(mCoffFile + mCoffSectionsOffset[Idx], + (UINT8*)mEhdr + Shdr->sh_offset, + Shdr->sh_size); + break; + + case SHT_NOBITS: + memset(mCoffFile + mCoffSectionsOffset[Idx], 0, Shdr->sh_size); + break; + + default: + // + // Ignore for unkown section type. + // + VerboseMsg ("%s unknown section type %x. We directly copy this section into Coff file", mInImageName, (unsigned)Shdr->sh_type); + break; + } + } + } + + // + // Second: apply relocations. + // + for (Idx = 0; Idx < mEhdr->e_shnum; Idx++) { + // + // Determine if this is a relocation section. + // + Elf_Shdr *RelShdr = GetShdrByIndex(Idx); + if ((RelShdr->sh_type != SHT_REL) && (RelShdr->sh_type != SHT_RELA)) { + continue; + } + + // + // Relocation section found. Now extract section information that the relocations + // apply to in the ELF data and the new COFF data. + // + SecShdr = GetShdrByIndex(RelShdr->sh_info); + SecOffset = mCoffSectionsOffset[RelShdr->sh_info]; + + // + // Only process relocations for the current filter type. + // + if (RelShdr->sh_type == SHT_REL && (*Filter)(SecShdr)) { + UINT32 RelOffset; + + // + // Determine the symbol table referenced by the relocation data. + // + Elf_Shdr *SymtabShdr = GetShdrByIndex(RelShdr->sh_link); + UINT8 *Symtab = (UINT8*)mEhdr + SymtabShdr->sh_offset; + + // + // Process all relocation entries for this section. + // + for (RelOffset = 0; RelOffset < RelShdr->sh_size; RelOffset += RelShdr->sh_entsize) { + // + // Set pointer to relocation entry + // + Elf_Rel *Rel = (Elf_Rel *)((UINT8*)mEhdr + RelShdr->sh_offset + RelOffset); + + // + // Set pointer to symbol table entry associated with the relocation entry. + // + Elf_Sym *Sym = (Elf_Sym *)(Symtab + ELF_R_SYM(Rel->r_info) * SymtabShdr->sh_entsize); + + Elf_Shdr *SymShdr; + UINT8 *Targ; + UINT16 Address; + + // + // Check section header index found in symbol table and get the section + // header location. + // + if (Sym->st_shndx == SHN_UNDEF + || Sym->st_shndx == SHN_ABS + || Sym->st_shndx > mEhdr->e_shnum) { + Error (NULL, 0, 3000, "Invalid", "%s bad symbol definition.", mInImageName); + } + SymShdr = GetShdrByIndex(Sym->st_shndx); + + // + // Convert the relocation data to a pointer into the coff file. + // + // Note: + // r_offset is the virtual address of the storage unit to be relocated. + // sh_addr is the virtual address for the base of the section. + // + Targ = mCoffFile + SecOffset + (Rel->r_offset - SecShdr->sh_addr); + + // + // Determine how to handle each relocation type based on the machine type. + // + if (mEhdr->e_machine == EM_386) { + switch (ELF_R_TYPE(Rel->r_info)) { + case R_386_NONE: + break; + case R_386_32: + // + // Absolute relocation. + // Converts Targ from a absolute virtual address to the absolute + // COFF address. + // + *(UINT32 *)Targ = *(UINT32 *)Targ - SymShdr->sh_addr + + mCoffSectionsOffset[Sym->st_shndx]; + break; + case R_386_PC32: + // + // Relative relocation: Symbol - Ip + Addend + // + *(UINT32 *)Targ = *(UINT32 *)Targ + + (mCoffSectionsOffset[Sym->st_shndx] - SymShdr->sh_addr) + - (SecOffset - SecShdr->sh_addr); + break; + default: + Error (NULL, 0, 3000, "Invalid", "%s unsupported ELF EM_386 relocation 0x%x.", mInImageName, (unsigned) ELF_R_TYPE(Rel->r_info)); + } + } else if (mEhdr->e_machine == EM_ARM) { + switch (ELF32_R_TYPE(Rel->r_info)) { + case R_ARM_RBASE: + // No relocation - no action required + + case R_ARM_PC24: + case R_ARM_XPC25: + case R_ARM_THM_PC22: + case R_ARM_THM_JUMP19: + case R_ARM_CALL: + case R_ARM_JMP24: + // Thease are all PC-relative relocations and don't require modification + // GCC does not seem to have the concept of a application that just needs to get relocated. + break; + + case R_ARM_THM_MOVW_ABS_NC: + // MOVW is only lower 16-bits of the addres + Address = (UINT16)(Sym->st_value - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx]); + ThumbMovtImmediatePatch ((UINT16 *)Targ, Address); + break; + + case R_ARM_THM_MOVT_ABS: + // MOVT is only upper 16-bits of the addres + Address = (UINT16)((Sym->st_value - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx]) >> 16); + ThumbMovtImmediatePatch ((UINT16 *)Targ, Address); + break; + + case R_ARM_ABS32: + case R_ARM_RABS32: + // + // Absolute relocation. + // + *(UINT32 *)Targ = *(UINT32 *)Targ - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx]; + break; + + default: + Error (NULL, 0, 3000, "Invalid", "WriteSections (): %s unsupported ELF EM_ARM relocation 0x%x.", mInImageName, (unsigned) ELF32_R_TYPE(Rel->r_info)); + } + } + } + } + } + + return TRUE; +} + +STATIC +VOID +WriteRelocations32 ( + VOID + ) +{ + UINT32 Index; + EFI_IMAGE_OPTIONAL_HEADER_UNION *NtHdr; + EFI_IMAGE_DATA_DIRECTORY *Dir; + BOOLEAN FoundRelocations; + Elf_Dyn *Dyn; + Elf_Rel *Rel; + UINTN RelElementSize; + UINTN RelSize; + UINTN RelOffset; + UINTN K; + UINT8 *Targ; + Elf32_Phdr *DynamicSegment; + Elf32_Phdr *TargetSegment; + Elf_Sym *Sym; + Elf_Shdr *SymtabShdr; + UINT8 *Symtab; + + + for (Index = 0, FoundRelocations = FALSE; Index < mEhdr->e_shnum; Index++) { + Elf_Shdr *RelShdr = GetShdrByIndex(Index); + if ((RelShdr->sh_type == SHT_REL) || (RelShdr->sh_type == SHT_RELA)) { + Elf_Shdr *SecShdr = GetShdrByIndex (RelShdr->sh_info); + if (IsTextShdr(SecShdr) || IsDataShdr(SecShdr)) { + UINT32 RelIdx; + + SymtabShdr = GetShdrByIndex (RelShdr->sh_link); + Symtab = (UINT8*)mEhdr + SymtabShdr->sh_offset; + FoundRelocations = TRUE; + for (RelIdx = 0; RelIdx < RelShdr->sh_size; RelIdx += RelShdr->sh_entsize) { + Elf_Rel *Rel = (Elf_Rel *)((UINT8*)mEhdr + RelShdr->sh_offset + RelIdx); + Elf_Shdr *SymShdr; + + Sym = (Elf_Sym *)(Symtab + ELF_R_SYM(Rel->r_info) * SymtabShdr->sh_entsize); + SymShdr = GetShdrByIndex (Sym->st_shndx); + + if (mEhdr->e_machine == EM_386) { + switch (ELF_R_TYPE(Rel->r_info)) { + case R_386_NONE: + case R_386_PC32: + // + // No fixup entry required. + // + break; + case R_386_32: + // + // Creates a relative relocation entry from the absolute entry. + // + CoffAddFixup(mCoffSectionsOffset[RelShdr->sh_info] + + (Rel->r_offset - SecShdr->sh_addr), + EFI_IMAGE_REL_BASED_HIGHLOW); + break; + default: + Error (NULL, 0, 3000, "Invalid", "%s unsupported ELF EM_386 relocation 0x%x.", mInImageName, (unsigned) ELF_R_TYPE(Rel->r_info)); + } + } else if (mEhdr->e_machine == EM_ARM) { + switch (ELF32_R_TYPE(Rel->r_info)) { + case R_ARM_RBASE: + // No relocation - no action required + case R_ARM_PC24: + case R_ARM_XPC25: + case R_ARM_THM_PC22: + case R_ARM_THM_JUMP19: + case R_ARM_CALL: + case R_ARM_JMP24: + // Thease are all PC-relative relocations and don't require modification + break; + + case R_ARM_THM_MOVW_ABS_NC: + CoffAddFixup ( + mCoffSectionsOffset[RelShdr->sh_info] + + (Rel->r_offset - SecShdr->sh_addr), + EFI_IMAGE_REL_BASED_ARM_THUMB_MOVW + ); + break; + + case R_ARM_THM_MOVT_ABS: + CoffAddFixup ( + mCoffSectionsOffset[RelShdr->sh_info] + + (Rel->r_offset - SecShdr->sh_addr), + EFI_IMAGE_REL_BASED_ARM_THUMB_MOVT + ); + + // The relocation entry needs to contain the lower 16-bits so we can do math + CoffAddFixupEntry ((UINT16)(Sym->st_value - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx])); + break; + + case R_ARM_ABS32: + case R_ARM_RABS32: + CoffAddFixup ( + mCoffSectionsOffset[RelShdr->sh_info] + + (Rel->r_offset - SecShdr->sh_addr), + EFI_IMAGE_REL_BASED_HIGHLOW + ); + break; + + default: + Error (NULL, 0, 3000, "Invalid", "WriteRelocations(): %s unsupported ELF EM_ARM relocation 0x%x.", mInImageName, (unsigned) ELF32_R_TYPE(Rel->r_info)); + } + } else { + Error (NULL, 0, 3000, "Not Supported", "This tool does not support relocations for ELF with e_machine %u (processor type).", (unsigned) mEhdr->e_machine); + } + } + } + } + } + + if (!FoundRelocations && (mEhdr->e_machine == EM_ARM)) { + /* Try again, but look for PT_DYNAMIC instead of SHT_REL */ + + for (Index = 0; Index < mEhdr->e_phnum; Index++) { + RelElementSize = 0; + RelSize = 0; + RelOffset = 0; + + DynamicSegment = GetPhdrByIndex (Index); + + if (DynamicSegment->p_type == PT_DYNAMIC) { + Dyn = (Elf32_Dyn *) ((UINT8 *)mEhdr + DynamicSegment->p_offset); + + while (Dyn->d_tag != DT_NULL) { + switch (Dyn->d_tag) { + case DT_REL: + RelOffset = Dyn->d_un.d_val; + break; + + case DT_RELSZ: + RelSize = Dyn->d_un.d_val; + break; + + case DT_RELENT: + RelElementSize = Dyn->d_un.d_val; + break; + + default: + break; + } + Dyn++; + } + if (( RelOffset == 0 ) || ( RelSize == 0 ) || ( RelElementSize == 0 )) { + Error (NULL, 0, 3000, "Invalid", "%s bad ARM dynamic relocations.", mInImageName); + } + + for (K = 0; K < RelSize; K += RelElementSize) { + + if (DynamicSegment->p_paddr == 0) { + // Older versions of the ARM ELF (SWS ESPC 0003 B-02) specification define DT_REL + // as an offset in the dynamic segment. p_paddr is defined to be zero for ARM tools + Rel = (Elf32_Rel *) ((UINT8 *) mEhdr + DynamicSegment->p_offset + RelOffset + K); + } else { + // This is how it reads in the generic ELF specification + Rel = (Elf32_Rel *) ((UINT8 *) mEhdr + RelOffset + K); + } + + switch (ELF32_R_TYPE (Rel->r_info)) { + case R_ARM_RBASE: + break; + + case R_ARM_RABS32: + TargetSegment = GetPhdrByIndex (ELF32_R_SYM (Rel->r_info) - 1); + + // Note: r_offset in a memory address. Convert it to a pointer in the coff file. + Targ = mCoffFile + mCoffSectionsOffset[ ELF32_R_SYM( Rel->r_info ) ] + Rel->r_offset - TargetSegment->p_vaddr; + + *(UINT32 *)Targ = *(UINT32 *)Targ + mCoffSectionsOffset [ELF32_R_SYM( Rel->r_info )]; + + CoffAddFixup (mCoffSectionsOffset[ELF32_R_SYM (Rel->r_info)] + (Rel->r_offset - TargetSegment->p_vaddr), EFI_IMAGE_REL_BASED_HIGHLOW); + break; + + default: + Error (NULL, 0, 3000, "Invalid", "%s bad ARM dynamic relocations, unkown type %d.", mInImageName, ELF32_R_TYPE (Rel->r_info)); + break; + } + } + break; + } + } + } + + // + // Pad by adding empty entries. + // + while (mCoffOffset & (mCoffAlignment - 1)) { + CoffAddFixupEntry(0); + } + + NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset); + Dir = &NtHdr->Pe32.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC]; + Dir->Size = mCoffOffset - mRelocOffset; + if (Dir->Size == 0) { + // If no relocations, null out the directory entry and don't add the .reloc section + Dir->VirtualAddress = 0; + NtHdr->Pe32.FileHeader.NumberOfSections--; + } else { + Dir->VirtualAddress = mRelocOffset; + CreateSectionHeader (".reloc", mRelocOffset, mCoffOffset - mRelocOffset, + EFI_IMAGE_SCN_CNT_INITIALIZED_DATA + | EFI_IMAGE_SCN_MEM_DISCARDABLE + | EFI_IMAGE_SCN_MEM_READ); + } + +} + +STATIC +VOID +WriteDebug32 ( + VOID + ) +{ + UINT32 Len; + UINT32 DebugOffset; + EFI_IMAGE_OPTIONAL_HEADER_UNION *NtHdr; + EFI_IMAGE_DATA_DIRECTORY *DataDir; + EFI_IMAGE_DEBUG_DIRECTORY_ENTRY *Dir; + EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY *Nb10; + + Len = strlen(mInImageName) + 1; + DebugOffset = mCoffOffset; + + mCoffOffset += sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY) + + sizeof(EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY) + + Len; + mCoffOffset = CoffAlign(mCoffOffset); + + mCoffFile = realloc(mCoffFile, mCoffOffset); + memset(mCoffFile + DebugOffset, 0, mCoffOffset - DebugOffset); + + Dir = (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY*)(mCoffFile + DebugOffset); + Dir->Type = EFI_IMAGE_DEBUG_TYPE_CODEVIEW; + Dir->SizeOfData = sizeof(EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY) + Len; + Dir->RVA = DebugOffset + sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY); + Dir->FileOffset = DebugOffset + sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY); + + Nb10 = (EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY*)(Dir + 1); + Nb10->Signature = CODEVIEW_SIGNATURE_NB10; + strcpy ((char *)(Nb10 + 1), mInImageName); + + + NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset); + DataDir = &NtHdr->Pe32.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG]; + DataDir->VirtualAddress = DebugOffset; + DataDir->Size = mCoffOffset - DebugOffset; + if (DataDir->Size == 0) { + // If no debug, null out the directory entry and don't add the .debug section + DataDir->VirtualAddress = 0; + NtHdr->Pe32.FileHeader.NumberOfSections--; + } else { + DataDir->VirtualAddress = DebugOffset; + CreateSectionHeader (".debug", DebugOffset, mCoffOffset - DebugOffset, + EFI_IMAGE_SCN_CNT_INITIALIZED_DATA + | EFI_IMAGE_SCN_MEM_DISCARDABLE + | EFI_IMAGE_SCN_MEM_READ); + + } +} + +STATIC +VOID +SetImageSize32 ( + VOID + ) +{ + EFI_IMAGE_OPTIONAL_HEADER_UNION *NtHdr; + + // + // Set image size + // + NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset); + NtHdr->Pe32.OptionalHeader.SizeOfImage = mCoffOffset; +} + +STATIC +VOID +CleanUp32 ( + VOID + ) +{ + if (mCoffSectionsOffset != NULL) { + free (mCoffSectionsOffset); + } +} + + |