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ipxe/src/util/elf2efi.c

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/*
* Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#define FILE_LICENCE(...) extern void __file_licence ( void )
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <elf.h>
#include <libgen.h>
#include <ipxe/efi/Uefi.h>
#include <ipxe/efi/IndustryStandard/PeImage.h>
#define eprintf(...) fprintf ( stderr, __VA_ARGS__ )
#ifdef EFI_TARGET32
#define EFI_IMAGE_NT_HEADERS EFI_IMAGE_NT_HEADERS32
#define EFI_IMAGE_NT_OPTIONAL_HDR_MAGIC EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC
#define EFI_IMAGE_FILE_MACHINE EFI_IMAGE_FILE_32BIT_MACHINE
#define ELFCLASS ELFCLASS32
#define Elf_Ehdr Elf32_Ehdr
#define Elf_Shdr Elf32_Shdr
#define Elf_Sym Elf32_Sym
#define Elf_Addr Elf32_Addr
#define Elf_Rel Elf32_Rel
#define Elf_Rela Elf32_Rela
#define ELF_R_TYPE ELF32_R_TYPE
#define ELF_R_SYM ELF32_R_SYM
#elif defined(EFI_TARGET64)
#define EFI_IMAGE_NT_HEADERS EFI_IMAGE_NT_HEADERS64
#define EFI_IMAGE_NT_OPTIONAL_HDR_MAGIC EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC
#define EFI_IMAGE_FILE_MACHINE 0
#define ELFCLASS ELFCLASS64
#define Elf_Ehdr Elf64_Ehdr
#define Elf_Shdr Elf64_Shdr
#define Elf_Sym Elf64_Sym
#define Elf_Addr Elf64_Addr
#define Elf_Rel Elf64_Rel
#define Elf_Rela Elf64_Rela
#define ELF_R_TYPE ELF64_R_TYPE
#define ELF_R_SYM ELF64_R_SYM
#endif
#define ELF_MREL( mach, type ) ( (mach) | ( (type) << 16 ) )
/* Allow for building with older versions of elf.h */
#ifndef EM_AARCH64
#define EM_AARCH64 183
#define R_AARCH64_NONE 0
#define R_AARCH64_ABS64 257
#define R_AARCH64_CALL26 283
#define R_AARCH64_JUMP26 282
#define R_AARCH64_ADR_PREL_LO21 274
#define R_AARCH64_ADR_PREL_PG_HI21 275
#define R_AARCH64_ADD_ABS_LO12_NC 277
#define R_AARCH64_LDST8_ABS_LO12_NC 278
#define R_AARCH64_LDST16_ABS_LO12_NC 284
#define R_AARCH64_LDST32_ABS_LO12_NC 285
#define R_AARCH64_LDST64_ABS_LO12_NC 286
#endif /* EM_AARCH64 */
#ifndef R_ARM_CALL
#define R_ARM_CALL 28
#endif
#ifndef R_ARM_THM_JUMP24
#define R_ARM_THM_JUMP24 30
#endif
#ifndef R_ARM_V4BX
#define R_ARM_V4BX 40
#endif
/* Seems to be missing from elf.h */
#ifndef R_AARCH64_NULL
#define R_AARCH64_NULL 256
#endif
#define EFI_FILE_ALIGN 0x20
struct elf_file {
void *data;
size_t len;
const Elf_Ehdr *ehdr;
};
struct pe_section {
struct pe_section *next;
EFI_IMAGE_SECTION_HEADER hdr;
void ( * fixup ) ( struct pe_section *section );
uint8_t contents[0];
};
struct pe_relocs {
struct pe_relocs *next;
unsigned long start_rva;
unsigned int used_relocs;
unsigned int total_relocs;
uint16_t *relocs;
};
struct pe_header {
EFI_IMAGE_DOS_HEADER dos;
uint8_t padding[128];
EFI_IMAGE_NT_HEADERS nt;
};
static struct pe_header efi_pe_header = {
.dos = {
.e_magic = EFI_IMAGE_DOS_SIGNATURE,
.e_lfanew = offsetof ( typeof ( efi_pe_header ), nt ),
},
.nt = {
.Signature = EFI_IMAGE_NT_SIGNATURE,
.FileHeader = {
.TimeDateStamp = 0x10d1a884,
.SizeOfOptionalHeader =
sizeof ( efi_pe_header.nt.OptionalHeader ),
.Characteristics = ( EFI_IMAGE_FILE_DLL |
EFI_IMAGE_FILE_MACHINE |
EFI_IMAGE_FILE_EXECUTABLE_IMAGE ),
},
.OptionalHeader = {
.Magic = EFI_IMAGE_NT_OPTIONAL_HDR_MAGIC,
.MajorLinkerVersion = 42,
.MinorLinkerVersion = 42,
.SectionAlignment = EFI_FILE_ALIGN,
.FileAlignment = EFI_FILE_ALIGN,
.SizeOfImage = sizeof ( efi_pe_header ),
.SizeOfHeaders = sizeof ( efi_pe_header ),
.NumberOfRvaAndSizes =
EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES,
},
},
};
/** Command-line options */
struct options {
unsigned int subsystem;
};
/**
* Allocate memory
*
* @v len Length of memory to allocate
* @ret ptr Pointer to allocated memory
*/
static void * xmalloc ( size_t len ) {
void *ptr;
ptr = malloc ( len );
if ( ! ptr ) {
eprintf ( "Could not allocate %zd bytes\n", len );
exit ( 1 );
}
return ptr;
}
/**
* Align section within PE file
*
* @v offset Unaligned offset
* @ret aligned_offset Aligned offset
*/
static unsigned long efi_file_align ( unsigned long offset ) {
return ( ( offset + EFI_FILE_ALIGN - 1 ) & ~( EFI_FILE_ALIGN - 1 ) );
}
/**
* Generate entry in PE relocation table
*
* @v pe_reltab PE relocation table
* @v rva RVA
* @v size Size of relocation entry
*/
static void generate_pe_reloc ( struct pe_relocs **pe_reltab,
unsigned long rva, size_t size ) {
unsigned long start_rva;
uint16_t reloc;
struct pe_relocs *pe_rel;
uint16_t *relocs;
/* Construct */
start_rva = ( rva & ~0xfff );
reloc = ( rva & 0xfff );
switch ( size ) {
case 8:
reloc |= 0xa000;
break;
case 4:
reloc |= 0x3000;
break;
case 2:
reloc |= 0x2000;
break;
default:
eprintf ( "Unsupported relocation size %zd\n", size );
exit ( 1 );
}
/* Locate or create PE relocation table */
for ( pe_rel = *pe_reltab ; pe_rel ; pe_rel = pe_rel->next ) {
if ( pe_rel->start_rva == start_rva )
break;
}
if ( ! pe_rel ) {
pe_rel = xmalloc ( sizeof ( *pe_rel ) );
memset ( pe_rel, 0, sizeof ( *pe_rel ) );
pe_rel->next = *pe_reltab;
*pe_reltab = pe_rel;
pe_rel->start_rva = start_rva;
}
/* Expand relocation list if necessary */
if ( pe_rel->used_relocs < pe_rel->total_relocs ) {
relocs = pe_rel->relocs;
} else {
pe_rel->total_relocs = ( pe_rel->total_relocs ?
( pe_rel->total_relocs * 2 ) : 256 );
relocs = xmalloc ( pe_rel->total_relocs *
sizeof ( pe_rel->relocs[0] ) );
memset ( relocs, 0,
pe_rel->total_relocs * sizeof ( pe_rel->relocs[0] ) );
memcpy ( relocs, pe_rel->relocs,
pe_rel->used_relocs * sizeof ( pe_rel->relocs[0] ) );
free ( pe_rel->relocs );
pe_rel->relocs = relocs;
}
/* Store relocation */
pe_rel->relocs[ pe_rel->used_relocs++ ] = reloc;
}
/**
* Calculate size of binary PE relocation table
*
* @v pe_reltab PE relocation table
* @v buffer Buffer to contain binary table, or NULL
* @ret size Size of binary table
*/
static size_t output_pe_reltab ( struct pe_relocs *pe_reltab,
void *buffer ) {
struct pe_relocs *pe_rel;
unsigned int num_relocs;
size_t size;
size_t total_size = 0;
for ( pe_rel = pe_reltab ; pe_rel ; pe_rel = pe_rel->next ) {
num_relocs = ( ( pe_rel->used_relocs + 1 ) & ~1 );
size = ( sizeof ( uint32_t ) /* VirtualAddress */ +
sizeof ( uint32_t ) /* SizeOfBlock */ +
( num_relocs * sizeof ( uint16_t ) ) );
if ( buffer ) {
*( (uint32_t *) ( buffer + total_size + 0 ) )
= pe_rel->start_rva;
*( (uint32_t *) ( buffer + total_size + 4 ) ) = size;
memcpy ( ( buffer + total_size + 8 ), pe_rel->relocs,
( num_relocs * sizeof ( uint16_t ) ) );
}
total_size += size;
}
return total_size;
}
/**
* Read input ELF file
*
* @v name File name
* @v elf ELF file
*/
static void read_elf_file ( const char *name, struct elf_file *elf ) {
static const unsigned char ident[] = {
ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3, ELFCLASS, ELFDATA2LSB
};
struct stat stat;
const Elf_Ehdr *ehdr;
const Elf_Shdr *shdr;
void *data;
size_t offset;
unsigned int i;
int fd;
/* Open file */
fd = open ( name, O_RDONLY );
if ( fd < 0 ) {
eprintf ( "Could not open %s: %s\n", name, strerror ( errno ) );
exit ( 1 );
}
/* Get file size */
if ( fstat ( fd, &stat ) < 0 ) {
eprintf ( "Could not get size of %s: %s\n",
name, strerror ( errno ) );
exit ( 1 );
}
elf->len = stat.st_size;
/* Map file */
data = mmap ( NULL, elf->len, PROT_READ, MAP_SHARED, fd, 0 );
if ( data == MAP_FAILED ) {
eprintf ( "Could not map %s: %s\n", name, strerror ( errno ) );
exit ( 1 );
}
elf->data = data;
/* Close file */
close ( fd );
/* Check header */
ehdr = elf->data;
if ( ( elf->len < sizeof ( *ehdr ) ) ||
( memcmp ( ident, ehdr->e_ident, sizeof ( ident ) ) != 0 ) ) {
eprintf ( "Invalid ELF header in %s\n", name );
exit ( 1 );
}
elf->ehdr = ehdr;
/* Check section headers */
for ( i = 0 ; i < ehdr->e_shnum ; i++ ) {
offset = ( ehdr->e_shoff + ( i * ehdr->e_shentsize ) );
if ( elf->len < ( offset + sizeof ( *shdr ) ) ) {
eprintf ( "ELF section header outside file in %s\n",
name );
exit ( 1 );
}
shdr = ( data + offset );
if ( ( shdr->sh_type != SHT_NOBITS ) &&
( ( elf->len < shdr->sh_offset ) ||
( ( ( elf->len - shdr->sh_offset ) < shdr->sh_size ) ))){
eprintf ( "ELF section %d outside file in %s\n",
i, name );
exit ( 1 );
}
if ( shdr->sh_link >= ehdr->e_shnum ) {
eprintf ( "ELF section %d link section %d out of "
"range\n", i, shdr->sh_link );
exit ( 1 );
}
}
}
/**
* Get ELF string
*
* @v elf ELF file
* @v section String table section number
* @v offset String table offset
* @ret string ELF string
*/
static const char * elf_string ( struct elf_file *elf, unsigned int section,
size_t offset ) {
const Elf_Ehdr *ehdr = elf->ehdr;
const Elf_Shdr *shdr;
char *string;
char *last;
/* Locate section header */
if ( section >= ehdr->e_shnum ) {
eprintf ( "Invalid ELF string section %d\n", section );
exit ( 1 );
}
shdr = ( elf->data + ehdr->e_shoff + ( section * ehdr->e_shentsize ) );
/* Sanity check section */
if ( shdr->sh_type != SHT_STRTAB ) {
eprintf ( "ELF section %d (type %d) is not a string table\n",
section, shdr->sh_type );
exit ( 1 );
}
last = ( elf->data + shdr->sh_offset + shdr->sh_size - 1 );
if ( *last != '\0' ) {
eprintf ( "ELF section %d is not NUL-terminated\n", section );
exit ( 1 );
}
/* Locate string */
if ( offset >= shdr->sh_size ) {
eprintf ( "Invalid ELF string offset %zd in section %d\n",
offset, section );
exit ( 1 );
}
string = ( elf->data + shdr->sh_offset + offset );
return string;
}
/**
* Set machine architecture
*
* @v elf ELF file
* @v pe_header PE file header
*/
static void set_machine ( struct elf_file *elf, struct pe_header *pe_header ) {
const Elf_Ehdr *ehdr = elf->ehdr;
uint16_t machine;
/* Identify machine architecture */
switch ( ehdr->e_machine ) {
case EM_386:
machine = EFI_IMAGE_MACHINE_IA32;
break;
case EM_X86_64:
machine = EFI_IMAGE_MACHINE_X64;
break;
case EM_ARM:
machine = EFI_IMAGE_MACHINE_ARMTHUMB_MIXED;
break;
case EM_AARCH64:
machine = EFI_IMAGE_MACHINE_AARCH64;
break;
default:
eprintf ( "Unknown ELF architecture %d\n", ehdr->e_machine );
exit ( 1 );
}
/* Set machine architecture */
pe_header->nt.FileHeader.Machine = machine;
}
/**
* Process section
*
* @v elf ELF file
* @v shdr ELF section header
* @v pe_header PE file header
* @ret new New PE section
*/
static struct pe_section * process_section ( struct elf_file *elf,
const Elf_Shdr *shdr,
struct pe_header *pe_header ) {
struct pe_section *new;
const char *name;
size_t section_memsz;
size_t section_filesz;
unsigned long code_start;
unsigned long code_end;
unsigned long data_start;
unsigned long data_mid;
unsigned long data_end;
unsigned long start;
unsigned long end;
unsigned long *applicable_start;
unsigned long *applicable_end;
/* Get section name */
name = elf_string ( elf, elf->ehdr->e_shstrndx, shdr->sh_name );
/* Extract current RVA limits from file header */
code_start = pe_header->nt.OptionalHeader.BaseOfCode;
code_end = ( code_start + pe_header->nt.OptionalHeader.SizeOfCode );
#if defined(EFI_TARGET32)
data_start = pe_header->nt.OptionalHeader.BaseOfData;
#elif defined(EFI_TARGET64)
data_start = code_end;
#endif
data_mid = ( data_start +
pe_header->nt.OptionalHeader.SizeOfInitializedData );
data_end = ( data_mid +
pe_header->nt.OptionalHeader.SizeOfUninitializedData );
/* Allocate PE section */
section_memsz = shdr->sh_size;
section_filesz = ( ( shdr->sh_type == SHT_PROGBITS ) ?
efi_file_align ( section_memsz ) : 0 );
new = xmalloc ( sizeof ( *new ) + section_filesz );
memset ( new, 0, sizeof ( *new ) + section_filesz );
/* Fill in section header details */
strncpy ( ( char * ) new->hdr.Name, name, sizeof ( new->hdr.Name ) );
new->hdr.Misc.VirtualSize = section_memsz;
new->hdr.VirtualAddress = shdr->sh_addr;
new->hdr.SizeOfRawData = section_filesz;
/* Fill in section characteristics and update RVA limits */
if ( ( shdr->sh_type == SHT_PROGBITS ) &&
( shdr->sh_flags & SHF_EXECINSTR ) ) {
/* .text-type section */
new->hdr.Characteristics =
( EFI_IMAGE_SCN_CNT_CODE |
EFI_IMAGE_SCN_MEM_NOT_PAGED |
EFI_IMAGE_SCN_MEM_EXECUTE |
EFI_IMAGE_SCN_MEM_READ );
applicable_start = &code_start;
applicable_end = &code_end;
} else if ( ( shdr->sh_type == SHT_PROGBITS ) &&
( shdr->sh_flags & SHF_WRITE ) ) {
/* .data-type section */
new->hdr.Characteristics =
( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA |
EFI_IMAGE_SCN_MEM_NOT_PAGED |
EFI_IMAGE_SCN_MEM_READ |
EFI_IMAGE_SCN_MEM_WRITE );
applicable_start = &data_start;
applicable_end = &data_mid;
} else if ( shdr->sh_type == SHT_PROGBITS ) {
/* .rodata-type section */
new->hdr.Characteristics =
( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA |
EFI_IMAGE_SCN_MEM_NOT_PAGED |
EFI_IMAGE_SCN_MEM_READ );
applicable_start = &data_start;
applicable_end = &data_mid;
} else if ( shdr->sh_type == SHT_NOBITS ) {
/* .bss-type section */
new->hdr.Characteristics =
( EFI_IMAGE_SCN_CNT_UNINITIALIZED_DATA |
EFI_IMAGE_SCN_MEM_NOT_PAGED |
EFI_IMAGE_SCN_MEM_READ |
EFI_IMAGE_SCN_MEM_WRITE );
applicable_start = &data_mid;
applicable_end = &data_end;
} else {
eprintf ( "Unrecognised characteristics for section %s\n",
name );
exit ( 1 );
}
/* Copy in section contents */
if ( shdr->sh_type == SHT_PROGBITS ) {
memcpy ( new->contents, ( elf->data + shdr->sh_offset ),
shdr->sh_size );
}
/* Update RVA limits */
start = new->hdr.VirtualAddress;
end = ( start + new->hdr.Misc.VirtualSize );
if ( ( ! *applicable_start ) || ( *applicable_start >= start ) )
*applicable_start = start;
if ( *applicable_end < end )
*applicable_end = end;
if ( data_start < code_end )
data_start = code_end;
if ( data_mid < data_start )
data_mid = data_start;
if ( data_end < data_mid )
data_end = data_mid;
/* Write RVA limits back to file header */
pe_header->nt.OptionalHeader.BaseOfCode = code_start;
pe_header->nt.OptionalHeader.SizeOfCode = ( code_end - code_start );
#if defined(EFI_TARGET32)
pe_header->nt.OptionalHeader.BaseOfData = data_start;
#endif
pe_header->nt.OptionalHeader.SizeOfInitializedData =
( data_mid - data_start );
pe_header->nt.OptionalHeader.SizeOfUninitializedData =
( data_end - data_mid );
/* Update remaining file header fields */
pe_header->nt.FileHeader.NumberOfSections++;
pe_header->nt.OptionalHeader.SizeOfHeaders += sizeof ( new->hdr );
pe_header->nt.OptionalHeader.SizeOfImage =
efi_file_align ( data_end );
return new;
}
/**
* Process relocation record
*
* @v elf ELF file
* @v shdr ELF section header
* @v syms Symbol table
* @v nsyms Number of symbol table entries
* @v rel Relocation record
* @v pe_reltab PE relocation table to fill in
*/
static void process_reloc ( struct elf_file *elf, const Elf_Shdr *shdr,
const Elf_Sym *syms, unsigned int nsyms,
const Elf_Rel *rel, struct pe_relocs **pe_reltab ) {
unsigned int type = ELF_R_TYPE ( rel->r_info );
unsigned int sym = ELF_R_SYM ( rel->r_info );
unsigned int mrel = ELF_MREL ( elf->ehdr->e_machine, type );
size_t offset = ( shdr->sh_addr + rel->r_offset );
/* Look up symbol and process relocation */
if ( sym >= nsyms ) {
eprintf ( "Symbol out of range\n" );
exit ( 1 );
}
if ( syms[sym].st_shndx == SHN_ABS ) {
/* Skip absolute symbols; the symbol value won't
* change when the object is loaded.
*/
} else {
switch ( mrel ) {
case ELF_MREL ( EM_386, R_386_NONE ) :
case ELF_MREL ( EM_ARM, R_ARM_NONE ) :
case ELF_MREL ( EM_X86_64, R_X86_64_NONE ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_NONE ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_NULL ) :
/* Ignore dummy relocations used by REQUIRE_SYMBOL() */
break;
case ELF_MREL ( EM_386, R_386_32 ) :
case ELF_MREL ( EM_ARM, R_ARM_ABS32 ) :
/* Generate a 4-byte PE relocation */
generate_pe_reloc ( pe_reltab, offset, 4 );
break;
case ELF_MREL ( EM_X86_64, R_X86_64_64 ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_ABS64 ) :
/* Generate an 8-byte PE relocation */
generate_pe_reloc ( pe_reltab, offset, 8 );
break;
case ELF_MREL ( EM_386, R_386_PC32 ) :
case ELF_MREL ( EM_ARM, R_ARM_CALL ) :
case ELF_MREL ( EM_ARM, R_ARM_THM_PC22 ) :
case ELF_MREL ( EM_ARM, R_ARM_THM_JUMP24 ) :
case ELF_MREL ( EM_ARM, R_ARM_V4BX ):
case ELF_MREL ( EM_X86_64, R_X86_64_PC32 ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_CALL26 ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_JUMP26 ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_ADR_PREL_LO21 ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_ADR_PREL_PG_HI21 ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_ADD_ABS_LO12_NC ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_LDST8_ABS_LO12_NC ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_LDST16_ABS_LO12_NC ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_LDST32_ABS_LO12_NC ) :
case ELF_MREL ( EM_AARCH64, R_AARCH64_LDST64_ABS_LO12_NC ) :
/* Skip PC-relative relocations; all relative
* offsets remain unaltered when the object is
* loaded.
*/
break;
default:
eprintf ( "Unrecognised relocation type %d\n", type );
exit ( 1 );
}
}
}
/**
* Process relocation records
*
* @v elf ELF file
* @v shdr ELF section header
* @v stride Relocation record size
* @v pe_reltab PE relocation table to fill in
*/
static void process_relocs ( struct elf_file *elf, const Elf_Shdr *shdr,
size_t stride, struct pe_relocs **pe_reltab ) {
const Elf_Shdr *symtab;
const Elf_Sym *syms;
const Elf_Rel *rel;
unsigned int nsyms;
unsigned int nrels;
unsigned int i;
/* Identify symbol table */
symtab = ( elf->data + elf->ehdr->e_shoff +
( shdr->sh_link * elf->ehdr->e_shentsize ) );
syms = ( elf->data + symtab->sh_offset );
nsyms = ( symtab->sh_size / sizeof ( syms[0] ) );
/* Process each relocation */
rel = ( elf->data + shdr->sh_offset );
nrels = ( shdr->sh_size / stride );
for ( i = 0 ; i < nrels ; i++ ) {
process_reloc ( elf, shdr, syms, nsyms, rel, pe_reltab );
rel = ( ( ( const void * ) rel ) + stride );
}
}
/**
* Create relocations section
*
* @v pe_header PE file header
* @v pe_reltab PE relocation table
* @ret section Relocation section
*/
static struct pe_section *
create_reloc_section ( struct pe_header *pe_header,
struct pe_relocs *pe_reltab ) {
struct pe_section *reloc;
size_t section_memsz;
size_t section_filesz;
EFI_IMAGE_DATA_DIRECTORY *relocdir;
/* Allocate PE section */
section_memsz = output_pe_reltab ( pe_reltab, NULL );
section_filesz = efi_file_align ( section_memsz );
reloc = xmalloc ( sizeof ( *reloc ) + section_filesz );
memset ( reloc, 0, sizeof ( *reloc ) + section_filesz );
/* Fill in section header details */
strncpy ( ( char * ) reloc->hdr.Name, ".reloc",
sizeof ( reloc->hdr.Name ) );
reloc->hdr.Misc.VirtualSize = section_memsz;
reloc->hdr.VirtualAddress = pe_header->nt.OptionalHeader.SizeOfImage;
reloc->hdr.SizeOfRawData = section_filesz;
reloc->hdr.Characteristics = ( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA |
EFI_IMAGE_SCN_MEM_NOT_PAGED |
EFI_IMAGE_SCN_MEM_READ );
/* Copy in section contents */
output_pe_reltab ( pe_reltab, reloc->contents );
/* Update file header details */
pe_header->nt.FileHeader.NumberOfSections++;
pe_header->nt.OptionalHeader.SizeOfHeaders += sizeof ( reloc->hdr );
pe_header->nt.OptionalHeader.SizeOfImage += section_filesz;
relocdir = &(pe_header->nt.OptionalHeader.DataDirectory
[EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC]);
relocdir->VirtualAddress = reloc->hdr.VirtualAddress;
relocdir->Size = reloc->hdr.Misc.VirtualSize;
return reloc;
}
/**
* Fix up debug section
*
* @v debug Debug section
*/
static void fixup_debug_section ( struct pe_section *debug ) {
EFI_IMAGE_DEBUG_DIRECTORY_ENTRY *contents;
/* Fix up FileOffset */
contents = ( ( void * ) debug->contents );
contents->FileOffset += ( debug->hdr.PointerToRawData -
debug->hdr.VirtualAddress );
}
/**
* Create debug section
*
* @v pe_header PE file header
* @ret section Debug section
*/
static struct pe_section *
create_debug_section ( struct pe_header *pe_header, const char *filename ) {
struct pe_section *debug;
size_t section_memsz;
size_t section_filesz;
EFI_IMAGE_DATA_DIRECTORY *debugdir;
struct {
EFI_IMAGE_DEBUG_DIRECTORY_ENTRY debug;
EFI_IMAGE_DEBUG_CODEVIEW_RSDS_ENTRY rsds;
char name[ strlen ( filename ) + 1 ];
} *contents;
/* Allocate PE section */
section_memsz = sizeof ( *contents );
section_filesz = efi_file_align ( section_memsz );
debug = xmalloc ( sizeof ( *debug ) + section_filesz );
memset ( debug, 0, sizeof ( *debug ) + section_filesz );
contents = ( void * ) debug->contents;
/* Fill in section header details */
strncpy ( ( char * ) debug->hdr.Name, ".debug",
sizeof ( debug->hdr.Name ) );
debug->hdr.Misc.VirtualSize = section_memsz;
debug->hdr.VirtualAddress = pe_header->nt.OptionalHeader.SizeOfImage;
debug->hdr.SizeOfRawData = section_filesz;
debug->hdr.Characteristics = ( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA |
EFI_IMAGE_SCN_MEM_NOT_PAGED |
EFI_IMAGE_SCN_MEM_READ );
debug->fixup = fixup_debug_section;
/* Create section contents */
contents->debug.TimeDateStamp = 0x10d1a884;
contents->debug.Type = EFI_IMAGE_DEBUG_TYPE_CODEVIEW;
contents->debug.SizeOfData =
( sizeof ( *contents ) - sizeof ( contents->debug ) );
contents->debug.RVA = ( debug->hdr.VirtualAddress +
offsetof ( typeof ( *contents ), rsds ) );
contents->debug.FileOffset = contents->debug.RVA;
contents->rsds.Signature = CODEVIEW_SIGNATURE_RSDS;
snprintf ( contents->name, sizeof ( contents->name ), "%s",
filename );
/* Update file header details */
pe_header->nt.FileHeader.NumberOfSections++;
pe_header->nt.OptionalHeader.SizeOfHeaders += sizeof ( debug->hdr );
pe_header->nt.OptionalHeader.SizeOfImage += section_filesz;
debugdir = &(pe_header->nt.OptionalHeader.DataDirectory
[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG]);
debugdir->VirtualAddress = debug->hdr.VirtualAddress;
debugdir->Size = sizeof ( contents->debug );
return debug;
}
/**
* Write out PE file
*
* @v pe_header PE file header
* @v pe_sections List of PE sections
* @v pe Output file
*/
static void write_pe_file ( struct pe_header *pe_header,
struct pe_section *pe_sections,
FILE *pe ) {
struct pe_section *section;
unsigned long fpos = 0;
/* Align length of headers */
fpos = pe_header->nt.OptionalHeader.SizeOfHeaders =
efi_file_align ( pe_header->nt.OptionalHeader.SizeOfHeaders );
/* Assign raw data pointers */
for ( section = pe_sections ; section ; section = section->next ) {
if ( section->hdr.SizeOfRawData ) {
section->hdr.PointerToRawData = fpos;
fpos += section->hdr.SizeOfRawData;
fpos = efi_file_align ( fpos );
}
if ( section->fixup )
section->fixup ( section );
}
/* Write file header */
if ( fwrite ( pe_header, sizeof ( *pe_header ), 1, pe ) != 1 ) {
perror ( "Could not write PE header" );
exit ( 1 );
}
/* Write section headers */
for ( section = pe_sections ; section ; section = section->next ) {
if ( fwrite ( &section->hdr, sizeof ( section->hdr ),
1, pe ) != 1 ) {
perror ( "Could not write section header" );
exit ( 1 );
}
}
/* Write sections */
for ( section = pe_sections ; section ; section = section->next ) {
if ( fseek ( pe, section->hdr.PointerToRawData,
SEEK_SET ) != 0 ) {
eprintf ( "Could not seek to %x: %s\n",
section->hdr.PointerToRawData,
strerror ( errno ) );
exit ( 1 );
}
if ( section->hdr.SizeOfRawData &&
( fwrite ( section->contents, section->hdr.SizeOfRawData,
1, pe ) != 1 ) ) {
eprintf ( "Could not write section %.8s: %s\n",
section->hdr.Name, strerror ( errno ) );
exit ( 1 );
}
}
}
/**
* Convert ELF to PE
*
* @v elf_name ELF file name
* @v pe_name PE file name
*/
static void elf2pe ( const char *elf_name, const char *pe_name,
struct options *opts ) {
char pe_name_tmp[ strlen ( pe_name ) + 1 ];
struct pe_relocs *pe_reltab = NULL;
struct pe_section *pe_sections = NULL;
struct pe_section **next_pe_section = &pe_sections;
struct pe_header pe_header;
struct elf_file elf;
const Elf_Shdr *shdr;
size_t offset;
unsigned int i;
FILE *pe;
/* Create a modifiable copy of the PE name */
memcpy ( pe_name_tmp, pe_name, sizeof ( pe_name_tmp ) );
/* Read ELF file */
read_elf_file ( elf_name, &elf );
/* Initialise the PE header */
memcpy ( &pe_header, &efi_pe_header, sizeof ( pe_header ) );
set_machine ( &elf, &pe_header );
pe_header.nt.OptionalHeader.AddressOfEntryPoint = elf.ehdr->e_entry;
pe_header.nt.OptionalHeader.Subsystem = opts->subsystem;
/* Process input sections */
for ( i = 0 ; i < elf.ehdr->e_shnum ; i++ ) {
offset = ( elf.ehdr->e_shoff + ( i * elf.ehdr->e_shentsize ) );
shdr = ( elf.data + offset );
/* Process section */
if ( shdr->sh_flags & SHF_ALLOC ) {
/* Create output section */
*(next_pe_section) = process_section ( &elf, shdr,
&pe_header );
next_pe_section = &(*next_pe_section)->next;
} else if ( shdr->sh_type == SHT_REL ) {
/* Process .rel relocations */
process_relocs ( &elf, shdr, sizeof ( Elf_Rel ),
&pe_reltab );
} else if ( shdr->sh_type == SHT_RELA ) {
/* Process .rela relocations */
process_relocs ( &elf, shdr, sizeof ( Elf_Rela ),
&pe_reltab );
}
}
/* Create the .reloc section */
*(next_pe_section) = create_reloc_section ( &pe_header, pe_reltab );
next_pe_section = &(*next_pe_section)->next;
/* Create the .debug section */
*(next_pe_section) = create_debug_section ( &pe_header,
basename ( pe_name_tmp ) );
next_pe_section = &(*next_pe_section)->next;
/* Write out PE file */
pe = fopen ( pe_name, "w" );
if ( ! pe ) {
eprintf ( "Could not open %s for writing: %s\n",
pe_name, strerror ( errno ) );
exit ( 1 );
}
write_pe_file ( &pe_header, pe_sections, pe );
fclose ( pe );
/* Unmap ELF file */
munmap ( elf.data, elf.len );
}
/**
* Print help
*
* @v program_name Program name
*/
static void print_help ( const char *program_name ) {
eprintf ( "Syntax: %s [--subsystem=<number>] infile outfile\n",
program_name );
}
/**
* Parse command-line options
*
* @v argc Argument count
* @v argv Argument list
* @v opts Options structure to populate
*/
static int parse_options ( const int argc, char **argv,
struct options *opts ) {
char *end;
int c;
while (1) {
int option_index = 0;
static struct option long_options[] = {
{ "subsystem", required_argument, NULL, 's' },
{ "help", 0, NULL, 'h' },
{ 0, 0, 0, 0 }
};
if ( ( c = getopt_long ( argc, argv, "s:h",
long_options,
&option_index ) ) == -1 ) {
break;
}
switch ( c ) {
case 's':
opts->subsystem = strtoul ( optarg, &end, 0 );
if ( *end ) {
eprintf ( "Invalid subsytem \"%s\"\n",
optarg );
exit ( 2 );
}
break;
case 'h':
print_help ( argv[0] );
exit ( 0 );
case '?':
default:
exit ( 2 );
}
}
return optind;
}
int main ( int argc, char **argv ) {
struct options opts = {
.subsystem = EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION,
};
int infile_index;
const char *infile;
const char *outfile;
/* Parse command-line arguments */
infile_index = parse_options ( argc, argv, &opts );
if ( argc != ( infile_index + 2 ) ) {
print_help ( argv[0] );
exit ( 2 );
}
infile = argv[infile_index];
outfile = argv[infile_index + 1];
/* Convert file */
elf2pe ( infile, outfile, &opts );
return 0;
}
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