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modified buildmtoc Signed-off-by: SergeySlice <sergey.slice@gmail.com>
2023-03-23 18:35:49 +01:00
/*
* Copyright (c) 2007 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#define __eip eip
#define __rip rip
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include "stuff/breakout.h"
#include "stuff/errors.h"
#include "stuff/allocate.h"
#include "stuff/reloc.h"
#include "stuff/rnd.h"
#include "coff/ms_dos_stub.h"
#include "coff/filehdr.h"
#include "coff/aouthdr.h"
#include "coff/scnhdr.h"
#include "coff/syment.h"
#include "coff/bytesex.h"
#include "coff/base_relocs.h"
#include "mach-o/x86_64/reloc.h"
#include "mach-o/arm64/reloc.h"
/* used by error routines as the name of this program */
char *progname = NULL;
/* the bytesex of our target object file and of this host machine */
static enum byte_sex target_byte_sex;
static enum byte_sex host_byte_sex;
static enum bool swapped;
/* the size of the pecoff output file */
static uint32_t output_size = 0;
static uint32_t majorVersion = 0;
static uint32_t minorVersion = 0;
/*
* The headers, and elements of them in the pecoff output file.
*/
static struct ms_dos_stub ms_dos_stub;
static char signature[4];
static struct filehdr filehdr;
static struct aouthdr aouthdr;
static struct aouthdr_64 aouthdr64;
uint32_t entry = 0; /* the entry point */
uint32_t nscns = 0; /* the number of section headers and contents pointers */
static struct scnhdr *scnhdrs = NULL; /* the section headers */
static char **scn_contents = NULL; /* pointers to the section contents */
/*
* The value of the -subsystem argument to then set in the PECOFF aouthdr.
*/
static uint16_t Subsystem = IMAGE_SUBSYSTEM_EFI_APPLICATION;
struct subsystem_argument {
char *name;
uint16_t value;
};
struct subsystem_argument subsystem_arguments[] = {
{ "application", IMAGE_SUBSYSTEM_EFI_APPLICATION },
{ "app", IMAGE_SUBSYSTEM_EFI_APPLICATION },
{ "UEFI_APPLICATION", IMAGE_SUBSYSTEM_EFI_APPLICATION },
{ "APPLICATION", IMAGE_SUBSYSTEM_EFI_APPLICATION },
{ "boot", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "bsdrv", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "DXE_DRIVER", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "SEC", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "peim", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "BASE", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "PEI_CORE", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "PEIM", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "DXE_SMM_DRIVER", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "TOOL", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "USER_DEFINED", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "UEFI_DRIVER", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "DXE_CORE", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "SECURITY_CORE", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "COMBINED_PEIM_DRIVER", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "PIC_PEIM", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "RELOCATABLE_PEIM", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "BS_DRIVER", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "SMM_CORE", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER },
{ "runtime", IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER },
{ "rtdrv", IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER },
{ "DXE_RUNTIME_DRIVER", IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER },
{ NULL, 0 }
};
/*
* The value of the -section_alignment argument (or the -align argument) to
* layout the added PECOFF sections and set into the PECOFF aouthdr.
*/
static uint32_t section_alignment = SECTIONALIGNMENT;
/*
* The value of the -align argument to layout the PECOFF file.
*/
static uint32_t file_alignment = FILEALIGNMENT;
/* The maximum alignment allowed to be specified, in hex */
#define MAXALIGN 0x8000
/* Static routine to help parse arguments */
static enum bool ispoweroftwo(uint32_t x);
/*
* The string for the -d argument.
*/
char *debug_filename = NULL;
/*
* The string for the -u argument.
*/
char *debug_uuid = NULL;
/*
* Format specifier for scanf() to convert UUID to individual bytes
*/
#define UUID_FORMAT_STRING "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
/*
* The string for the entry point symbol name.
*/
char *entry_point = NULL;
#ifdef HACK_TO_MATCH_TEST_CASE
/*
* These are are used for the HACK to get the symbol table for 32-bit files to
* match the one produced by objcopy. They are the pecoff section numbers of
* the .common and .bss sections.
*/
static uint32_t common_scnum = 0;
static uint32_t bss_scnum = 0;
#endif
/*
* These are for the .reloc section that contains the base relocations.
*/
static struct scnhdr *reloc_scnhdr = NULL;
static uint32_t reloc_size = 0;
static char *reloc_contents = NULL;
/*
* These are for the pecoff symbol table and string table.
*/
static uint32_t nsyments = 0; /* number of symbols */
static struct syment *syments = NULL; /* pointer to symbol table elements */
static uint32_t syment_offset = 0; /* file offset of the symbol table */
static uint32_t strsize = 0; /* size of the string table */
static char *strings = NULL; /* pointer to the string table */
static uint32_t section_names_size = 0; /* size of the section names */
static char *section_names = NULL; /* pointer to section names */
static uint32_t string_offset = 0; /* file offset of the string table */
/*
* These are for the .debug section that contains the -d filename information.
*/
static struct scnhdr *debug_scnhdr = NULL;
static uint32_t debug_size = 0;
static char *debug_contents = NULL;
static struct debug_directory_entry *dde = NULL;
static struct mtoc_debug_info *mdi = NULL;
static void process_arch(
struct arch *archs,
uint32_t narchs);
static void process_32bit_arch(
struct arch *arch);
static void process_64bit_arch(
struct arch *arch);
static void layout_output(
struct ofile *ofile);
static void create_output(
struct ofile *ofile,
char *out);
static void create_ms_dos_stub(
struct ms_dos_stub *p);
static void usage(
void);
static void create_32bit_symbol_table(
struct arch *arch);
static void create_64bit_symbol_table(
struct arch *arch);
/*
* This is the internal structure that we gather the base relocation in from
* the Mach-O relocation entries.
*/
struct base_reloc {
uint64_t addr;
uint32_t type;
};
struct base_reloc *base_relocs = NULL;
uint32_t nbase_reloc = 0;
static void create_base_reloc(
struct arch *arch);
static void gather_base_reloc_info(
uint32_t addr,
struct relocation_info *relocs,
uint32_t nreloc,
cpu_type_t cpu_type,
uint32_t length,
int macho_reloc_type,
int base_reloc_type);
static void add_base_reloc(
uint64_t addr,
uint32_t type);
static void make_base_relocs(
void);
static int cmp_base_relocs(
struct base_reloc *x1,
struct base_reloc *x2);
static uint32_t checksum(
unsigned char *buf);
static void string_to_uuid(
char *string,
uint8_t *uuid);
static void create_debug(
struct arch *arch);
static void set_debug_addrs_and_offsets(
void);
/* apple_version is created by the libstuff/Makefile */
extern char apple_version[];
char *version = apple_version;
/*
* The mtoc(1) tool makes a PECOFF file from a fully linked Mach-O file
* compiled with dynamic code gen and relocation entries saved (linked with -r).
*
* mtoc [-subsystem type] [-section_alignment hexvalue] [-align hexvalue]
* [-d filename] input_Mach-O output_pecoff
*/
int
main(
int argc,
char **argv,
char **envp)
{
int i, j;
char *input, *output;
struct ofile *ofile;
struct arch *archs;
uint32_t narchs;
char *endp;
enum bool section_alignment_specified, align_specified;
progname = argv[0];
host_byte_sex = get_host_byte_sex();
input = NULL;
output = NULL;
section_alignment_specified = FALSE;
align_specified = FALSE;
for(i = 1; i < argc; i++){
if(strcmp(argv[i], "-subsystem") == 0){
if(i + 1 >= argc){
warning("no argument specified for -subsystem option");
usage();
}
for(j = 0; subsystem_arguments[j].name != NULL; j++){
if(strcmp(argv[i+1], subsystem_arguments[j].name) == 0){
Subsystem = subsystem_arguments[j].value;
break;
}
}
if(subsystem_arguments[j].name == NULL){
warning("unknown argument: %s specified for -subsystem "
"argument can be:", argv[i+1]);
for(j = 0; subsystem_arguments[j].name != NULL; j++)
fprintf(stderr, "%s\n", subsystem_arguments[j].name);
usage();
}
i++;
}
else if(strcmp(argv[i], "-d") == 0){
if(i + 1 >= argc){
warning("no argument specified for -d option");
usage();
}
debug_filename = argv[i+1];
i++;
}
else if(strcmp(argv[i], "-e") == 0){
if(i + 1 >= argc){
warning("no argument specified for -e option");
usage();
}
entry_point = argv[i+1];
i++;
}
else if(strcmp(argv[i], "-u") == 0){
if(i + 1 >= argc){
warning("no argument specified for -u option");
usage();
}
if(debug_filename == NULL) {
fatal("-u option requires -d option");
}
debug_uuid = argv[i+1];
i++;
}
else if(strcmp(argv[i], "-section_alignment") == 0){
if(i + 1 >= argc){
warning("no argument specified for -section_alignment "
"option");
usage();
}
section_alignment = strtoul(argv[i+1], &endp, 16);
if(*endp != '\0')
fatal("argument for -section_alignment %s not a proper "
"hexadecimal number", argv[i+1]);
if(!ispoweroftwo(section_alignment) || section_alignment == 0)
fatal("argument to -section_alignment: %x (hex) must be a "
"non-zero power of two", section_alignment);
if(section_alignment > MAXALIGN)
fatal("argument to -section_alignment: %x (hex) must "
"equal to or less than %x (hex)", section_alignment,
(unsigned int)MAXALIGN);
section_alignment_specified = TRUE;
if(align_specified == TRUE &&
section_alignment != file_alignment)
fatal("can't specifiy a -section_alignment value %x (hex) "
"different from the -align value %x (hex)",
section_alignment, file_alignment);
i++;
}
else if(strcmp(argv[i], "-align") == 0){
if(i + 1 >= argc){
warning("no argument specified for -align option");
usage();
}
file_alignment = strtoul(argv[i+1], &endp, 16);
if(*endp != '\0')
fatal("argument for -align %s not a proper hexadecimal "
"number", argv[i+1]);
if(!ispoweroftwo(file_alignment) || file_alignment == 0)
fatal("argument to -align: %x (hex) must be a non-zero "
"power of two", file_alignment);
if(file_alignment > MAXALIGN)
fatal("argument to -file_alignment: %x (hex) must "
"equal to or less than %x (hex)", file_alignment,
(unsigned int)MAXALIGN);
align_specified = TRUE;
if(section_alignment_specified == TRUE &&
section_alignment != file_alignment)
fatal("can't specifiy a -section_alignment value %x (hex) "
"different from the -align value %x (hex)",
section_alignment, file_alignment);
section_alignment = file_alignment;
i++;
}
else if(strcmp(argv[i], "-version") == 0){
if(i + 1 >= argc){
warning("no argument specified for -version option");
usage();
}
if (sscanf(argv[i+1], "%u.%u", &majorVersion,
&minorVersion) != 2){
warning("invalid argument specified for -version option");
usage();
}
i++;
}
else if(input == NULL)
input = argv[i];
else if(output == NULL)
output = argv[i];
else
usage();
}
if(input == NULL){
warning("no input file specified");
usage();
}
if(output == NULL){
warning("no output file specified");
usage();
}
/* breakout the file for processing */
ofile = breakout(input, &archs, &narchs, FALSE);
if(errors)
return(EXIT_FAILURE);
/* checkout the file for symbol table replacement processing */
checkout(archs, narchs);
/* process the input file */
process_arch(archs, narchs);
if(errors){
free_archs(archs, narchs);
ofile_unmap(ofile);
return(EXIT_FAILURE);
}
/*
* Layout the pecoff output file from the information gathered from
* the input file creating the needed headers, relocs, etc.
*/
layout_output(ofile);
create_output(ofile, output);
if(errors == 0)
return(EXIT_SUCCESS);
else
return(EXIT_FAILURE);
}
/*
* usage() prints the current usage message and exits indicating failure.
*/
static
void
usage(
void)
{
fprintf(stderr, "Usage: %s [-subsystem type] "
"[-section_alignment hexvalue] [-align hexvalue] "
"[-version major.minor] [-ddebug_filename] "
"[-u debug_guid] input_Mach-O output_pecoff\n", progname);
exit(EXIT_FAILURE);
}
/*
* ispoweroftwo() returns TRUE or FALSE depending if x is a power of two.
*/
static
enum
bool
ispoweroftwo(
uint32_t x)
{
if(x == 0)
return(TRUE);
while((x & 0x1) != 0x1){
x >>= 1;
}
if((x & ~0x1) != 0)
return(FALSE);
else
return(TRUE);
}
/*
* process_arch() is the routine that process the broken out ofile to gather
* the info to create the pecoff file. This routine basically counts and adds
* up the sizes of the elements that will be in the pecoff output file.
*/
static
void
process_arch(
struct arch *archs,
uint32_t narchs)
{
/*
* Check to see the input file is something this program can convert to
* a pecoff file.
*/
if(narchs != 1)
fatal("input file: %s must only have one architecture",
archs->file_name);
if(archs->type != OFILE_Mach_O)
fatal("input file: %s must be a Mach-O file", archs->file_name);
if(archs->object->mh_cputype != CPU_TYPE_I386 &&
archs->object->mh_cputype != CPU_TYPE_ARM &&
archs->object->mh_cputype != CPU_TYPE_ARM64 &&
archs->object->mh_cputype != CPU_TYPE_X86_64)
fatal("input file: %s must be an i386 or ARM architecture",
archs->file_name);
if(archs->object->mh != NULL){
if(archs->object->mh->filetype == MH_PRELOAD ||
(archs->object->mh->filetype == MH_EXECUTE &&
(archs->object->mh->flags & MH_PIE) == MH_PIE)){
if(entry_point != NULL)
fatal("entry point option, -e %s, not allowed with "
"MH_PRELOAD or MH_EXECUTE file types", entry_point);
}
else{
fatal("input file: %s must be an MH_PRELOAD file type or "
"MH_EXECUTE file type with MH_PIE flag",
archs->file_name);
}
}
else{
if(archs->object->mh64->filetype == MH_DYLIB ||
(archs->object->mh64->filetype == MH_EXECUTE &&
(archs->object->mh64->flags & MH_PIE) == MH_PIE)){
if(entry_point == NULL &&
archs->object->mh64->filetype == MH_DYLIB)
fatal("input file: %s is a MH_DYLIB file type, so entry "
"point option, -e name, must be specified",
archs->file_name);
}
else if(archs->object->mh64->filetype == MH_PRELOAD ||
(archs->object->mh64->filetype == MH_EXECUTE &&
(archs->object->mh64->flags & MH_PIE) == MH_PIE)){
if(entry_point != NULL)
fatal("entry point option, -e %s, not allowed with "
"MH_PRELOAD or MH_EXECUTE file types",
archs->file_name);
}
else
fatal("input file: %s must be an MH_PRELOAD or MH_DYLIB file "
"type or MH_EXECUTE file type with MH_PIE flag",
archs->file_name);
}
target_byte_sex = archs->object->object_byte_sex;
swapped = host_byte_sex != target_byte_sex;
/*
* Create base relocation entries for this Mach-O file. This is done
* before the sections are created as this produces the contents for
* the .reloc section and determines it size.
*/
create_base_reloc(archs);
/*
* If there is a -d flag create the information that will be in .debug
* section for it.
*/
if(debug_filename != NULL)
create_debug(archs);
if(archs->object->mh != NULL)
process_32bit_arch(archs);
else
process_64bit_arch(archs);
}
/*
* process_32bit_arch() is the routine that processes a 32-bit broken out ofile
* to gather the info to create the pecoff file. This routine basically counts
* and adds up the sizes of the elements that will be in the pecoff output file.
*/
static
void
process_32bit_arch(
struct arch *arch)
{
uint32_t i, j, reloc_addr, debug_addr;
struct load_command *lc;
struct segment_command *sg;
struct thread_command *ut;
char *p, *state;
uint32_t flavor, count;
char *object_addr, *section_name;
#ifdef HACK_TO_MATCH_TEST_CASE
uint32_t len;
struct section *s;
#endif
/*
* Determine the number of sections in the pecoff output file.
*
#ifdef HACK_TO_MATCH_TEST_CASE
*
* The hack implementation of this routine is done to match the
* current ld_efi(1) script that uses objcopy(1) to make the pecoff
* file. So for 32-bit file the contents of the Mach-O file gets
* placed into pecoff sections as follows:
*
* the entire __TEXT segment becomes the .text section
* the entire __DATA segment becomes the .data section
* the zero fill section (__DATA,__common) becomes .common
* the zero fill section (__DATA,__bss) becomes .bss
* the (__IMPORT,__pointers) section becomes .pointers
* the base relocation entries go into the .reloc section
*
#else
*
* The whole Mach-O segments __TEXT, __DATA and __IMPORT are placed in
* the pecoff file from the Mach-O file. And then the .reloc section
* added for the base relocations.
*
#endif
*/
nscns = 0;
reloc_addr = 0;
lc = arch->object->load_commands;
for(i = 0; i < arch->object->mh->ncmds; i++){
if(lc->cmd == LC_SEGMENT){
sg = (struct segment_command *)lc;
if(strcmp(sg->segname, SEG_LINKEDIT) != 0 &&
sg->vmaddr + sg->vmsize > reloc_addr)
reloc_addr = sg->vmaddr + sg->vmsize;
if(strcmp(sg->segname, SEG_TEXT) == 0)
nscns++;
else if(strcmp(sg->segname, SEG_DATA) == 0){
nscns++;
#ifdef HACK_TO_MATCH_TEST_CASE
s = (struct section *)
((char *)sg + sizeof(struct segment_command));
for(j = 0; j < sg->nsects; j++, s++){
if(strcmp(s->sectname, SECT_COMMON) == 0 ||
strcmp(s->sectname, SECT_BSS) == 0){
nscns++;
}
else if(s->size != 0 &&
strcmp(s->sectname, SECT_DATA) != 0)
fatal("input file: %s contains Mach-O section "
"(%.16s,%.16s) unsupported for conversion "
"to a pecoff file", arch->file_name,
s->segname, s->sectname);
}
#endif /* HACK_TO_MATCH_TEST_CASE */
}
else if(strcmp(sg->segname, SEG_IMPORT) == 0){
#ifndef HACK_TO_MATCH_TEST_CASE
nscns++;
#else
s = (struct section *)
((char *)sg + sizeof(struct segment_command));
for(j = 0; j < sg->nsects; j++, s++){
if(strcmp(s->sectname, "__pointers") == 0){
section_names_size += strlen(".pointers") + 1;
nscns++;
}
else if(s->size != 0)
fatal("input file: %s contains Mach-O section "
"(%.16s,%.16s) unsupported for conversion "
"to a pecoff file", arch->file_name,
s->segname, s->sectname);
}
#endif /* HACK_TO_MATCH_TEST_CASE */
}
else if((arch->object->mh->flags & MH_PIE) != MH_PIE ||
strcmp(sg->segname, SEG_LINKEDIT) != 0){
fatal("input file: %s contains Mach-O segment %.16s "
"unsupported for conversion to a pecoff file",
arch->file_name, sg->segname);
}
}
/*
* Also while processing the Mach-O file pick up the entry point.
*/
else if(lc->cmd == LC_UNIXTHREAD){
ut = (struct thread_command *)lc;
state = (char *)ut + sizeof(struct thread_command);
p = (char *)ut + ut->cmdsize;
while(state < p){
flavor = *((uint32_t *)state);
state += sizeof(uint32_t);
count = *((uint32_t *)state);
state += sizeof(uint32_t);
switch(arch->object->mh_cputype){
case CPU_TYPE_I386:
switch((int)flavor){
i386_thread_state_t *cpu;
case i386_THREAD_STATE:
#if i386_THREAD_STATE == 1
case -1:
#endif /* i386_THREAD_STATE == 1 */
/* i386 thread states on older releases */
#if i386_THREAD_STATE == -1
case 1:
#endif /* i386_THREAD_STATE == -1 */
cpu = (i386_thread_state_t *)state;
entry = cpu->eip;
state += sizeof(i386_thread_state_t);
break;
default:
state += count * sizeof(uint32_t);
break;
}
break;
case CPU_TYPE_ARM:
switch(flavor){
arm_thread_state_t *cpu;
case ARM_THREAD_STATE:
cpu = (arm_thread_state_t *)state;
entry = cpu->__pc;
state += sizeof(arm_thread_state_t);
break;
default:
state += count * sizeof(uint32_t);
break;
}
break;
default:
break;
}
}
}
lc = (struct load_command *)((char *)lc + lc->cmdsize);
}
if(reloc_size != 0){
/* add one for the .reloc section to contain the base relocations */
nscns++;
}
/*
* If there is a -d flag add one for the .debug section to contain
* the information.
*/
if(debug_filename != NULL)
nscns++;
/*
* At the beginning of the COFF string table are 4 bytes that contain
* the total size (in bytes) of the rest of the string table. This size
* includes the size field itself, so that the value in this location
* would be 4 if no strings were present.
*/
strsize = sizeof(uint32_t);
/*
* Section names longer than 8 bytes are placed in the string table.
* So here we allocate memory to put them into, which later will be
* copied to the start of the string table.
*/
section_names = allocate(section_names_size);
section_name = section_names;
if(section_names_size != 0)
*section_name = '\0';
/*
* Allocate space for the section headers and fill in everything but
* their file offsets.
*
#ifndef HACK_TO_MATCH_TEST_CASE
*
* We use the SizeOfRawData field (s_size) as the unrounded value of
* the size of the initialized section contents coming from the
* segment's filesize. The VirtualSize field s_vsize may be bigger
* with the remaining space zero filled coming from the segment's
* vmsize.
#else
*
* Note to match what objcopy(1) does the s_vsize is an unrounded value
* of the size (more like the actual size) and the s_size is a value
* rounded to the file_alignment. So the s_vsize can be smaller than
* the s_size, as in the case of pecoff sections created from Mach-O
* sections (and not segments). This seems to volate the spec where
* s_vsize can be bigger than s_size with the remaining space zero
* filled but does NOT allow the s_vsize to be smaller than the s_size.
#endif
*/
scnhdrs = allocate(nscns * sizeof(struct scnhdr));
memset(scnhdrs, '\0', nscns * sizeof(struct scnhdr));
scn_contents = allocate(nscns * sizeof(char *));
object_addr = arch->object->object_addr;
j = 0;
lc = arch->object->load_commands;
for(i = 0; i < arch->object->mh->ncmds; i++){
if(lc->cmd == LC_SEGMENT){
sg = (struct segment_command *)lc;
if(strcmp(sg->segname, SEG_TEXT) == 0){
strcpy(scnhdrs[j].s_name, ".text");
#ifdef HACK_TO_MATCH_TEST_CASE
scnhdrs[j].s_vsize = sg->filesize;
#else
scnhdrs[j].s_vsize = sg->vmsize;
#endif
scnhdrs[j].s_vaddr = sg->vmaddr;
scnhdrs[j].s_size = rnd(sg->filesize, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_EXECUTE |
IMAGE_SCN_MEM_READ |
IMAGE_SCN_CNT_CODE;
scn_contents[j] = object_addr + sg->fileoff;
j++;
}
else if(strcmp(sg->segname, SEG_DATA) == 0){
strcpy(scnhdrs[j].s_name, ".data");
#ifdef HACK_TO_MATCH_TEST_CASE
scnhdrs[j].s_vsize = sg->filesize;
#else
scnhdrs[j].s_vsize = sg->vmsize;
#endif
scnhdrs[j].s_vaddr = sg->vmaddr;
scnhdrs[j].s_size = rnd(sg->filesize, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_MEM_WRITE |
IMAGE_SCN_CNT_CODE |
IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_EXECUTE;
scn_contents[j] = object_addr + sg->fileoff;
j++;
#ifdef HACK_TO_MATCH_TEST_CASE
s = (struct section *)
((char *)sg + sizeof(struct segment_command));
for(i = 0; i < sg->nsects; i++, s++){
if(s->size == 0)
continue;
scnhdrs[j].s_vsize = s->size;
scnhdrs[j].s_vaddr = s->addr;
scnhdrs[j].s_size = 0;
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_MEM_WRITE |
IMAGE_SCN_CNT_UNINITIALIZED_DATA;
if(strcmp(s->sectname, SECT_DATA) == 0){
continue;
}
else if(strcmp(s->sectname, SECT_COMMON) == 0){
strcpy(scnhdrs[j].s_name, ".common");
common_scnum = j + 1;
}
else if(strcmp(s->sectname, SECT_BSS) == 0){
strcpy(scnhdrs[j].s_name, ".bss");
bss_scnum = j + 1;
}
scn_contents[j] = NULL;
j++;
}
#endif /* HACK_TO_MATCH_TEST_CASE */
}
else if(strcmp(sg->segname, SEG_IMPORT) == 0){
#ifndef HACK_TO_MATCH_TEST_CASE
strcpy(scnhdrs[j].s_name, ".import");
scnhdrs[j].s_vsize = sg->vmsize;
scnhdrs[j].s_vaddr = sg->vmaddr;
scnhdrs[j].s_size = rnd(sg->filesize, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_MEM_WRITE |
IMAGE_SCN_CNT_INITIALIZED_DATA;
scn_contents[j] = object_addr + sg->fileoff;
j++;
#else /* defined(HACK_TO_MATCH_TEST_CASE) */
s = (struct section *)
((char *)sg + sizeof(struct segment_command));
for(i = 0; i < sg->nsects; i++, s++){
if(s->size == 0)
continue;
scnhdrs[j].s_vsize = s->size;
scnhdrs[j].s_vaddr = s->addr;
scnhdrs[j].s_size = rnd(s->size, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_MEM_WRITE |
IMAGE_SCN_CNT_INITIALIZED_DATA;
if(strcmp(s->sectname, "__pointers") == 0){
sprintf(scnhdrs[j].s_name, "/%d", strsize);
strcat(section_name, ".pointers");
len = strlen(section_name) + 1;
strsize += len;
}
scn_contents[j] = object_addr + s->offset;
j++;
}
#endif /* HACK_TO_MATCH_TEST_CASE */
}
}
lc = (struct load_command *)((char *)lc + lc->cmdsize);
}
if(reloc_size != 0){
strcpy(scnhdrs[j].s_name, ".reloc");
scnhdrs[j].s_vsize = reloc_size;
reloc_addr = rnd(reloc_addr, section_alignment);
scnhdrs[j].s_vaddr = reloc_addr;
scnhdrs[j].s_size = rnd(reloc_size, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_DISCARDABLE;
reloc_scnhdr = scnhdrs + j;
scn_contents[j] = reloc_contents;
j++;
debug_addr = reloc_addr + reloc_scnhdr->s_size;
}
else{
debug_addr = rnd(reloc_addr, section_alignment);
}
if(debug_filename != NULL){
strcpy(scnhdrs[j].s_name, ".debug");
scnhdrs[j].s_vsize = debug_size;
scnhdrs[j].s_vaddr = debug_addr;
scnhdrs[j].s_size = rnd(debug_size, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_DISCARDABLE;
debug_scnhdr = scnhdrs + j;
scn_contents[j] = debug_contents;
j++;
}
/*
* Create the pecoff symbol and string table from this Mach-O file.
*/
create_32bit_symbol_table(arch);
}
/*
* process_64bit_arch() is the routine that processes a 64-bit broken out ofile
* to gather the info to create the pecoff file. This routine basically counts
* and adds up the sizes of the elements that will be in the pecoff output file.
*/
static
void
process_64bit_arch(
struct arch *arch)
{
uint32_t i, j;
uint64_t reloc_addr, debug_addr;
struct load_command *lc;
struct segment_command_64 *sg64;
struct thread_command *ut;
char *p, *state;
uint32_t flavor, count;
char *object_addr, *section_name;
#ifdef HACK_TO_MATCH_TEST_CASE
struct section_64 *s64;
uint32_t len;
#endif
/*
* Determine the number of sections in the pecoff output file.
*
#ifdef HACK_TO_MATCH_TEST_CASE
*
* The hack implementation of this routine is done to match the
* current ld_efi(1) script that uses objcopy(1) to make the pecoff
* file. So for 64-bit files the contents of the Mach-O sections get
* placed into pecoff sections with a section name made up of the
* strings "LC_SEGMENT" the segment and section names separated with
* a dot, '.', character. So the Mach-O (__TEXT,__text) section becomes
* a pecoff section with the name "LC_SEGMENT.__TEXT.__text". The base
* relocation entries go into a ".reloc" section.
*
#else
*
* The whole Mach-O __TEXT and __DATA segments are placed in the
* pecoff file from the Mach-O file. And then the .reloc section added
* for the base relocations.
*
#endif
*/
nscns = 0;
reloc_addr = 0;
lc = arch->object->load_commands;
for(i = 0; i < arch->object->mh64->ncmds; i++){
if(lc->cmd == LC_SEGMENT_64){
sg64 = (struct segment_command_64 *)lc;
#ifndef HACK_TO_MATCH_TEST_CASE
if(strcmp(sg64->segname, SEG_LINKEDIT) != 0 &&
sg64->vmaddr + sg64->vmsize > reloc_addr)
reloc_addr = sg64->vmaddr + sg64->vmsize;
if(strcmp(sg64->segname, SEG_TEXT) == 0)
nscns++;
else if(strcmp(sg64->segname, SEG_DATA) == 0)
nscns++;
else if(strcmp(sg64->segname, SEG_LINKEDIT) != 0){
fatal("input file: %s contains Mach-O segment %.16s "
"unsupported for conversion to a pecoff file",
arch->file_name, sg64->segname);
}
#else /* defined(HACK_TO_MATCH_TEST_CASE) */
s64 = (struct section_64 *)
((char *)sg64 + sizeof(struct segment_command_64));
for(i = 0; i < sg64->nsects; i++, s64++){
if(s64->addr + s64->size > reloc_addr)
reloc_addr = s64->addr + s64->size;
section_names_size += strlen("LC_SEGMENT.") +
strlen(s64->segname) + 1 +
strlen(s64->sectname) + 1;
nscns++;
}
#endif /* HACK_TO_MATCH_TEST_CASE */
}
/*
* Also while process the Mach-O file pick up the entry point.
*/
else if(lc->cmd == LC_UNIXTHREAD){
ut = (struct thread_command *)lc;
state = (char *)ut + sizeof(struct thread_command);
p = (char *)ut + ut->cmdsize;
while(state < p){
flavor = *((uint32_t *)state);
state += sizeof(uint32_t);
count = *((uint32_t *)state);
state += sizeof(uint32_t);
switch(arch->object->mh_cputype){
#ifdef x86_THREAD_STATE64
case CPU_TYPE_X86_64:
switch(flavor){
x86_thread_state64_t *cpu64;
case x86_THREAD_STATE64:
cpu64 = (x86_thread_state64_t *)state;
entry = cpu64->rip;
state += sizeof(x86_thread_state64_t);
break;
default:
state += count * sizeof(uint32_t);
break;
}
break;
#endif /* x86_THREAD_STATE64 */
#ifdef ARM_THREAD_STATE64
case CPU_TYPE_ARM64:
switch(flavor){
arm_thread_state64_t *cpu64;
case ARM_THREAD_STATE64:
cpu64 = (arm_thread_state64_t *)state;
entry = cpu64->__pc;
state += sizeof(arm_thread_state64_t);
break;
default:
state += count * sizeof(uint32_t);
break;
}
break;
#endif /* ARM_THREAD_STATE64 */
}
}
}
lc = (struct load_command *)((char *)lc + lc->cmdsize);
}
if(reloc_size != 0){
/* add one for the .reloc section to contain the base relocations */
nscns++;
}
/*
* If there is a -d flag add one for the .debug section to contain
* the information.
*/
if(debug_filename != NULL)
nscns++;
/*
* At the beginning of the COFF string table are 4 bytes that contain
* the total size (in bytes) of the rest of the string table. This size
* includes the size field itself, so that the value in this location
* would be 4 if no strings were present.
*/
strsize = sizeof(uint32_t);
/*
* Section names longer than 8 bytes are placed in the string table.
* So here we allocate memory to put them into, which later will be
* copied to the start of the string table.
*/
section_names = allocate(section_names_size) + 1;
section_name = section_names;
if(section_names_size != 0)
*section_name = '\0';
/*
* Allocate space for the section headers and fill in everything but
* their file offsets.
*
#ifndef HACK_TO_MATCH_TEST_CASE
*
* We use the SizeOfRawData field (s_size) as the unrounded value of
* the size of the initialized section contents coming from the
* segment's filesize. The VirtualSize field s_vsize may be bigger
* with the remaining space zero filled coming from the segment's
* vmsize.
#else
*
* Note to match what objcopy(1) does the s_vsize is an unrounded value
* of the size (more like the actual size) and the s_size is a value
* rounded to the file_alignment. So the s_vsize can be smaller than
* the s_size, as in the case of pecoff sections created from Mach-O
* sections (and not segments). This seems to volate the spec where
* s_vsize can be bigger than s_size with the remaining space zero
* filled but does NOT allow the s_vsize to be smaller than the s_size.
#endif
*/
scnhdrs = allocate(nscns * sizeof(struct scnhdr));
memset(scnhdrs, '\0', nscns * sizeof(struct scnhdr));
scn_contents = allocate(nscns * sizeof(char *));
object_addr = arch->object->object_addr;
j = 0;
lc = arch->object->load_commands;
for(i = 0; i < arch->object->mh64->ncmds; i++){
if(lc->cmd == LC_SEGMENT_64){
sg64 = (struct segment_command_64 *)lc;
#ifndef HACK_TO_MATCH_TEST_CASE
if(strcmp(sg64->segname, SEG_TEXT) == 0){
strcpy(scnhdrs[j].s_name, ".text");
scnhdrs[j].s_vsize = sg64->vmsize;
scnhdrs[j].s_vaddr = sg64->vmaddr;
scnhdrs[j].s_size = rnd(sg64->filesize, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_EXECUTE |
IMAGE_SCN_MEM_READ |
IMAGE_SCN_CNT_CODE;
scn_contents[j] = object_addr + sg64->fileoff;
j++;
}
else if(strcmp(sg64->segname, SEG_DATA) == 0){
strcpy(scnhdrs[j].s_name, ".data");
scnhdrs[j].s_vsize = sg64->vmsize;
scnhdrs[j].s_vaddr = sg64->vmaddr;
scnhdrs[j].s_size = rnd(sg64->filesize, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_MEM_WRITE |
IMAGE_SCN_CNT_CODE |
IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_EXECUTE;
scn_contents[j] = object_addr + sg64->fileoff;
j++;
}
#else /* defined(HACK_TO_MATCH_TEST_CASE) */
s64 = (struct section_64 *)
((char *)sg64 + sizeof(struct segment_command_64));
for(i = 0; i < sg64->nsects; i++, s64++){
sprintf(scnhdrs[j].s_name, "/%d", strsize);
strcat(section_name, "LC_SEGMENT.");
strcat(section_name, s64->segname);
strcat(section_name, ".");
strcat(section_name, s64->sectname);
len = strlen(section_name);
strsize += len + 1;
section_name += len + 1;
*section_name = '\0'; /* start of next section name */
/* NOTE zerofill sections are not handled */
scnhdrs[j].s_vsize = s64->size;
scnhdrs[j].s_vaddr = s64->addr;
scnhdrs[j].s_size = rnd(s64->size, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_EXECUTE |
IMAGE_SCN_CNT_CODE |
IMAGE_SCN_MEM_WRITE;
if(sg64->initprot & VM_PROT_READ)
scnhdrs[j].s_flags |= IMAGE_SCN_MEM_READ;
scn_contents[j] = object_addr + s64->offset;
j++;
}
#endif /* HACK_TO_MATCH_TEST_CASE */
}
lc = (struct load_command *)((char *)lc + lc->cmdsize);
}
if(reloc_size != 0){
strcpy(scnhdrs[j].s_name, ".reloc");
scnhdrs[j].s_vsize = reloc_size;
reloc_addr = rnd(reloc_addr, section_alignment);
scnhdrs[j].s_vaddr = reloc_addr;
scnhdrs[j].s_size = rnd(reloc_size, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_DISCARDABLE |
IMAGE_SCN_CNT_CODE |
IMAGE_SCN_MEM_EXECUTE;
reloc_scnhdr = scnhdrs + j;
scn_contents[j] = reloc_contents;
j++;
debug_addr = reloc_addr + reloc_scnhdr->s_size;
}
else{
debug_addr = rnd(reloc_addr, section_alignment);
}
if(debug_filename != NULL){
strcpy(scnhdrs[j].s_name, ".debug");
scnhdrs[j].s_vsize = debug_size;
scnhdrs[j].s_vaddr = debug_addr;
scnhdrs[j].s_size = rnd(debug_size, file_alignment);
scnhdrs[j].s_relptr = 0;
scnhdrs[j].s_lnnoptr = 0;
scnhdrs[j].s_nlnno = 0;
scnhdrs[j].s_flags = IMAGE_SCN_MEM_READ |
IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_DISCARDABLE |
IMAGE_SCN_CNT_CODE |
IMAGE_SCN_MEM_EXECUTE;
debug_scnhdr = scnhdrs + j;
scn_contents[j] = debug_contents;
j++;
}
/*
* Create the pecoff symbol and string table from this Mach-O file.
*/
create_64bit_symbol_table(arch);
}
/*
* layout_output() takes the info gathered from the input Mach-O file and
* layouts the pecoff output file and creates and fills in the elements of
* the coff file. This routine basically sets of the offsets of the elements
* of the output file from the previously determined sizes.
*/
static
void
layout_output(
struct ofile *ofile)
{
uint32_t i, header_size, offset, least_vaddr;
/*
* Determine the size of the output file and where each element will be
* in the output file.
*/
header_size = sizeof(struct ms_dos_stub) +
sizeof(signature) +
sizeof(struct filehdr) +
nscns * sizeof(struct scnhdr);
if(ofile->mh != NULL)
header_size += sizeof(struct aouthdr);
else
header_size += sizeof(struct aouthdr_64);
header_size = rnd(header_size, file_alignment);
#ifdef HACK_TO_MATCH_TEST_CASE
/* for some unknown reason the header size is 0x488 not 0x400 */
if(ofile->mh64 != NULL)
header_size += 0x88;
#endif
/*
* If the lowest section virtual address is greater than the header
* size, pad the header up to the virtual address. This modification
* will make the file offset and virtual address equal, and fixes
* problems with XIP rebasing in the EFI tools.
*/
least_vaddr = 0xffffffff;
for(i = 0; i < nscns; i++){
if(scnhdrs[i].s_vaddr < least_vaddr)
least_vaddr = scnhdrs[i].s_vaddr;
}
if(least_vaddr > header_size)
header_size = least_vaddr;
offset = header_size;
for(i = 0; i < nscns; i++){
if((scnhdrs[i].s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0){
/*
* We need to check that the headers can be mapped starting at
* the ImageBase, fixed at zero in this program, and fit before
* the Virtual Address of the first section (really any section)
* and if it doesn't then we need the Mach-O file relinked.
*/
if(scnhdrs[i].s_vaddr < header_size)
fatal("input file: %s must be relinked so PECOFF headers "
"can be mapped before its sections (use a -seg1addr "
"0x%x or greater)", ofile->file_name, header_size);
/*
* The s_scnptr is set to the offset and then the offset is
* incremented by the SizeOfRawData field (s_vsize).
*/
scnhdrs[i].s_scnptr = offset;
#ifndef HACK_TO_MATCH_TEST_CASE
offset += scnhdrs[i].s_vsize;
#else
/* for some unknown reason the offset after the __dyld section
is changed from 0x10 bytes to 0x20 bytes */
if(ofile->mh64 != NULL && scnhdrs[i].s_vsize < 0x20)
offset += 0x20;
/* for some unknown reason the offset after the __data section
is changed from 0x380 bytes to 0x3e0 bytes */
else if(ofile->mh64 != NULL && scnhdrs[i].s_vsize == 0x380)
offset += scnhdrs[i].s_vsize + 0x60;
else
/*
* Note to match what objcopy(1) does the offset is
* incremented by the VirtualSize field (s_vsize) not the
* SizeOfRawData field (s_size) field as that is what was
* previously set up.
*/
offset += scnhdrs[i].s_vsize;
#endif
#ifdef HACK_TO_MATCH_TEST_CASE
if(ofile->mh != NULL)
#endif
offset = rnd(offset, file_alignment);
#ifdef HACK_TO_MATCH_TEST_CASE
else{
/* for some unknown reason the next offset is moved up
0x200 then rounded to 8 bytes */
offset += 0x200;
offset = rnd(offset, 8);
}
#endif
}
}
#ifdef HACK_TO_MATCH_TEST_CASE
/* for some unknown reason the offset of the symbol is moved back 0x58
bytes */
if(ofile->mh64 != NULL)
offset -= 0x58;
#endif
syment_offset = offset;
offset += nsyments * sizeof(struct syment);
string_offset = offset;
offset += strsize;
output_size = offset;
/*
* Now with all the sizes and placement of things know fill in headers
* of the pecoff file for this Mach-O file.
*/
/* first in the pecoff file is the MS-DOS stub */
create_ms_dos_stub(&ms_dos_stub);
/*
* Second in the pecoff file is the PE format image file signature.
* This signature is PE\0\0 (the letters P and E followed by two null
* bytes).
*/
signature[0] = 'P';
signature[1] = 'E';
signature[2] = '\0';
signature[3] = '\0';
/* next is the filehdr */
if(ofile->mh != NULL){
if(ofile->mh->cputype == CPU_TYPE_I386)
filehdr.f_magic = IMAGE_FILE_MACHINE_I386;
else
filehdr.f_magic = IMAGE_FILE_MACHINE_ARM;
}
else{
if(ofile->mh64->cputype == CPU_TYPE_X86_64)
filehdr.f_magic = IMAGE_FILE_MACHINE_AMD64;
else
filehdr.f_magic = IMAGE_FILE_MACHINE_ARM64;
}
filehdr.f_nscns = nscns;
#ifdef HACK_TO_MATCH_TEST_CASE
if(ofile->mh != NULL){
filehdr.f_timdat = 0x46cb5980;
}
else
filehdr.f_timdat = 0x47671e62;
#else
filehdr.f_timdat = time(NULL);
#endif
filehdr.f_symptr = syment_offset;
filehdr.f_nsyms = nsyments;
if(ofile->mh != NULL)
filehdr.f_opthdr = sizeof(struct aouthdr);
else
filehdr.f_opthdr = sizeof(struct aouthdr_64);
filehdr.f_flags = IMAGE_FILE_EXECUTABLE_IMAGE |
IMAGE_FILE_LINE_NUMS_STRIPPED |
IMAGE_FILE_32BIT_MACHINE |
IMAGE_FILE_DEBUG_STRIPPED;
if(ofile->mh64 != NULL)
filehdr.f_flags |= IMAGE_FILE_LOCAL_SYMS_STRIPPED;
/* next is the aouthdr */
if(ofile->mh != NULL){
aouthdr.magic = PE32MAGIC;
aouthdr.vstamp = VSTAMP;
/*
* EFI does not use t, d, or b size.
* EFI uses SizeOfImage to errorcheck vaddrs in the image
*/
aouthdr.tsize = 0;
aouthdr.dsize = 0;
aouthdr.bsize = 0;
aouthdr.SizeOfImage = rnd(header_size, section_alignment);
for(i = 0; i < nscns; i++){
aouthdr.SizeOfImage += rnd(scnhdrs[i].s_vsize, section_alignment);
}
aouthdr.entry = entry;
aouthdr.text_start = 0;
aouthdr.data_start = 0;
for(i = 0; i < nscns; i++){
if((scnhdrs[i].s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) ==0){
if((scnhdrs[i].s_flags & IMAGE_SCN_MEM_WRITE) == 0){
if(aouthdr.text_start == 0)
aouthdr.text_start = scnhdrs[i].s_vaddr;
}
else{
if(aouthdr.data_start == 0)
aouthdr.data_start = scnhdrs[i].s_vaddr;
}
}
}
aouthdr.ImageBase = 0;
aouthdr.SectionAlignment = section_alignment;
aouthdr.FileAlignment = file_alignment;
aouthdr.MajorOperatingSystemVersion = 0;
aouthdr.MinorOperatingSystemVersion = 0;
aouthdr.MajorImageVersion = majorVersion;
aouthdr.MinorImageVersion = minorVersion;
aouthdr.MajorSubsystemVersion = 0;
aouthdr.MinorSubsystemVersion = 0;
aouthdr.Win32VersionValue = 0;
aouthdr.SizeOfHeaders = header_size;
aouthdr.CheckSum = 0;
aouthdr.Subsystem = Subsystem;
aouthdr.DllCharacteristics = 0;
aouthdr.SizeOfStackReserve = 0;
aouthdr.SizeOfStackCommit = 0;
aouthdr.SizeOfHeapReserve = 0;
aouthdr.SizeOfHeapCommit = 0;
aouthdr.LoaderFlags = 0;
aouthdr.NumberOfRvaAndSizes = 16;
/* Entry 5, Base Relocation Directory [.reloc] address & size */
if(reloc_size != 0){
aouthdr.DataDirectory[5][0] = reloc_scnhdr->s_vaddr;
aouthdr.DataDirectory[5][1] = reloc_scnhdr->s_vsize;
}
/* Entry 6, Debug Directory [.debug] address & size */
if(debug_filename != NULL){
aouthdr.DataDirectory[6][0] = debug_scnhdr->s_vaddr;
aouthdr.DataDirectory[6][1] = debug_scnhdr->s_vsize;
}
}
else{
aouthdr64.magic = PE32PMAGIC;
aouthdr64.vstamp = VSTAMP;
/*
* EFI does not use t, d, or b size.
* EFI uses SizeOfImage to errorcheck vaddrs in the image
*/
aouthdr64.tsize = 0;
aouthdr64.dsize = 0;
aouthdr64.bsize = 0;
aouthdr64.SizeOfImage = rnd(header_size, section_alignment);
for(i = 0; i < nscns; i++){
aouthdr64.SizeOfImage += rnd(scnhdrs[i].s_vsize, section_alignment);
}
#ifdef HACK_TO_MATCH_TEST_CASE
/* with the IMAGE_SCN_CNT_CODE flag set on all sections this is
just a quick hack to match the PECOFF file */
aouthdr64.dsize = 0x200;
#endif
aouthdr64.entry = entry;
#ifdef HACK_TO_MATCH_TEST_CASE
aouthdr64.entry = 0x4a2;
#endif
aouthdr64.text_start = 0;
for(i = 0; i < nscns; i++){
if((scnhdrs[i].s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) ==0){
if((scnhdrs[i].s_flags & IMAGE_SCN_MEM_WRITE) == 0){
if(aouthdr64.text_start == 0)
aouthdr64.text_start = scnhdrs[i].s_vaddr;
}
}
}
#ifdef HACK_TO_MATCH_TEST_CASE
/* this is a hack as the start of the text for 64-bit Mach-O files
built with -dylib does not have the text section starting at 0 */
aouthdr64.text_start = 0;
#endif
aouthdr64.ImageBase = 0;
aouthdr64.SectionAlignment = section_alignment;
aouthdr64.FileAlignment = file_alignment;
aouthdr64.MajorOperatingSystemVersion = 0;
aouthdr64.MinorOperatingSystemVersion = 0;
aouthdr64.MajorImageVersion = majorVersion;
aouthdr64.MinorImageVersion = minorVersion;
aouthdr64.MajorSubsystemVersion = 0;
aouthdr64.MinorSubsystemVersion = 0;
aouthdr64.Win32VersionValue = 0;
#ifdef HACK_TO_MATCH_TEST_CASE
/* this is a hack as it seams that the minimum size is 0x10000 */
if(aouthdr64.SizeOfImage < 0x10000)
aouthdr64.SizeOfImage = 0x10000;
#endif
aouthdr64.SizeOfHeaders = header_size;
aouthdr64.CheckSum = 0;
aouthdr64.Subsystem = Subsystem;
#ifdef HACK_TO_MATCH_TEST_CASE
aouthdr64.Subsystem = IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER;
#endif
aouthdr64.DllCharacteristics = 0;
aouthdr64.SizeOfStackReserve = 0;
aouthdr64.SizeOfStackCommit = 0;
aouthdr64.SizeOfHeapReserve = 0;
aouthdr64.SizeOfHeapCommit = 0;
aouthdr64.LoaderFlags = 0;
aouthdr64.NumberOfRvaAndSizes = 16;
/* Entry 5, Base Relocation Directory [.reloc] address & size */
if(reloc_size != 0){
aouthdr64.DataDirectory[5][0] = reloc_scnhdr->s_vaddr;
aouthdr64.DataDirectory[5][1] = reloc_scnhdr->s_vsize;
}
/* Entry 6, Debug Directory [.debug] address & size */
if(debug_filename != NULL){
aouthdr64.DataDirectory[6][0] = debug_scnhdr->s_vaddr;
aouthdr64.DataDirectory[6][1] = debug_scnhdr->s_vsize;
}
}
/*
* If there is a debug directory entry set the address and offsets in
* it now that the values are known.
*/
if(debug_filename != NULL)
set_debug_addrs_and_offsets();
}
/*
* create_output() takes the info gathered from the input Mach-O file and
* creates the pecoff output file.
*/
static
void
create_output(
struct ofile *ofile,
char *out)
{
int i, f;
unsigned char *buf, *p, *p_aouthdr;
/*
* Allocate the buffer to place the pecoff file in.
*/
buf = calloc(1, output_size);
if(buf == NULL)
fatal("Can't allocate buffer for output file (size = %u)",
output_size);
/*
* Copy the parts of the pecoff file into the buffer.
*/
p = buf;
memcpy(p, &ms_dos_stub, sizeof(struct ms_dos_stub));
if(swapped)
swap_ms_dos_stub((struct ms_dos_stub *)p, target_byte_sex);
p += sizeof(struct ms_dos_stub);
memcpy(p, signature, sizeof(signature));
p += sizeof(signature);
memcpy(p, &filehdr, sizeof(struct filehdr));
if(swapped)
swap_filehdr((struct filehdr *)p, target_byte_sex);
p += sizeof(struct filehdr);
p_aouthdr = p;
if(ofile->mh != NULL){
memcpy(p, &aouthdr, sizeof(struct aouthdr));
if(swapped)
swap_aouthdr((struct aouthdr *)p, target_byte_sex);
p += sizeof(struct aouthdr);
}
else{
memcpy(p, &aouthdr64, sizeof(struct aouthdr_64));
if(swapped)
swap_aouthdr_64((struct aouthdr_64 *)p, target_byte_sex);
p += sizeof(struct aouthdr_64);
}
/*
* Now copy in the section contents. Note the base relocations
* (the contents of the .reloc section) has already been swapped if
* that was needed.
*/
for(i = 0; i < nscns; i++){
if((scnhdrs[i].s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0){
memcpy(buf + scnhdrs[i].s_scnptr,
scn_contents[i],
#ifndef HACK_TO_MATCH_TEST_CASE
scnhdrs[i].s_size);
#else
scnhdrs[i].s_vsize);
#endif
#ifdef HACK_TO_MATCH_TEST_CASE
/* this is a hack as this is zero in 64-bit file */
if(ofile->mh64 != NULL)
scnhdrs[i].s_vsize = 0;
#endif
}
}
memcpy(p, scnhdrs, nscns * sizeof(struct scnhdr));
if(swapped)
swap_scnhdr((struct scnhdr *)p, nscns, target_byte_sex);
p += nscns * sizeof(struct scnhdr);
/*
* Note the base relocations (the contents of the reloc section),
* the symbol table and string table all have already been swapped if
* that was needed.
*/
memcpy(buf + syment_offset, syments, nsyments * sizeof(struct syment));
memcpy(buf + string_offset, strings, strsize);
/*
* Now with the file contents complete compute the CheckSum in the
* optional header and update that in the output buffer.
*/
if(ofile->mh != NULL){
aouthdr.CheckSum = checksum(buf) + output_size;
memcpy(p_aouthdr, &aouthdr, sizeof(struct aouthdr));
if(swapped)
swap_aouthdr((struct aouthdr *)p_aouthdr, target_byte_sex);
}
else{
aouthdr64.CheckSum = checksum(buf) + output_size;
memcpy(p_aouthdr, &aouthdr64, sizeof(struct aouthdr_64));
if(swapped)
swap_aouthdr_64((struct aouthdr_64 *)p_aouthdr,target_byte_sex);
}
/*
* Create the pecoff file and write the buffer to the file.
*/
f = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644);
if(f == -1)
system_fatal("Can't create output file: %s", out);
if(write(f, buf, output_size) != output_size)
system_fatal("Can't write output file: %s", out);
if(close(f) == -1)
system_fatal("Can't close output file: %s", out);
}
/*
* create_ms_dos_stub() is pass a pointer to the buffer where to fill in the
* MS-DOS stub.
*/
static
void
create_ms_dos_stub(
struct ms_dos_stub *p)
{
int i;
p->e_magic = DOSMAGIC;
p->e_cblp = 0x90;
p->e_cp = 0x3;
p->e_crlc = 0x0;
p->e_cparhdr = 0x4;
p->e_minalloc = 0x0;
p->e_maxalloc = 0xffff;
p->e_ss = 0x0;
p->e_sp = 0xb8;
p->e_csum = 0x0;
p->e_ip = 0x0;
p->e_cs = 0x0;
p->e_lfarlc = 0x40;
p->e_ovno = 0x0;
for(i = 0; i < 4; i++)
p->e_res[i] = 0x0;
p->e_oemid = 0x0;
p->e_oeminfo = 0x0;
for(i = 0; i < 10; i++)
p->e_res2[i] = 0x0;
p->e_lfanew = 0x80;
/*
* The sub dos program that prints "This program cannot be run in DOS
* mode".
*/
p->dos_program[0] = 0x0e;
p->dos_program[1] = 0x1f;
p->dos_program[2] = 0xba;
p->dos_program[3] = 0x0e;
p->dos_program[4] = 0x00;
p->dos_program[5] = 0xb4;
p->dos_program[6] = 0x09;
p->dos_program[7] = 0xcd;
p->dos_program[8] = 0x21;
p->dos_program[9] = 0xb8;
p->dos_program[10] = 0x01;
p->dos_program[11] = 0x4c;
p->dos_program[12] = 0xcd;
p->dos_program[13] = 0x21;
p->dos_program[14] = 0x54;
p->dos_program[15] = 0x68;
p->dos_program[16] = 0x69;
p->dos_program[17] = 0x73;
p->dos_program[18] = 0x20;
p->dos_program[19] = 0x70;
p->dos_program[20] = 0x72;
p->dos_program[21] = 0x6f;
p->dos_program[22] = 0x67;
p->dos_program[23] = 0x72;
p->dos_program[24] = 0x61;
p->dos_program[25] = 0x6d;
p->dos_program[26] = 0x20;
p->dos_program[27] = 0x63;
p->dos_program[28] = 0x61;
p->dos_program[29] = 0x6e;
p->dos_program[30] = 0x6e;
p->dos_program[31] = 0x6f;
p->dos_program[32] = 0x74;
p->dos_program[33] = 0x20;
p->dos_program[34] = 0x62;
p->dos_program[35] = 0x65;
p->dos_program[36] = 0x20;
p->dos_program[37] = 0x72;
p->dos_program[38] = 0x75;
p->dos_program[39] = 0x6e;
p->dos_program[40] = 0x20;
p->dos_program[41] = 0x69;
p->dos_program[42] = 0x6e;
p->dos_program[43] = 0x20;
p->dos_program[44] = 0x44;
p->dos_program[45] = 0x4f;
p->dos_program[46] = 0x53;
p->dos_program[47] = 0x20;
p->dos_program[48] = 0x6d;
p->dos_program[49] = 0x6f;
p->dos_program[50] = 0x64;
p->dos_program[51] = 0x65;
p->dos_program[52] = 0x2e;
p->dos_program[53] = 0x0d;
p->dos_program[54] = 0x0d;
p->dos_program[55] = 0x0a;
p->dos_program[56] = 0x24;
p->dos_program[57] = 0x0;
p->dos_program[58] = 0x0;
p->dos_program[59] = 0x0;
p->dos_program[60] = 0x0;
p->dos_program[61] = 0x0;
p->dos_program[62] = 0x0;
p->dos_program[63] = 0x0;
}
/*
* create_32bit_symbol_table() is called to process the input Mach-O file and
* create the pecoff symbol and string table.
*/
static
void
create_32bit_symbol_table(
struct arch *arch)
{
char *object_addr;
struct symtab_command *st;
struct nlist *syms;
char *strs;
enum bool found_undef;
#ifdef HACK_TO_MATCH_TEST_CASE
uint32_t j, n_sect, bss_n_sect, common_n_sect,
bss_addr, common_addr, size;
struct load_command *lc;
struct segment_command *sg;
struct section *s;
#endif /* HACK_TO_MATCH_TEST_CASE */
uint32_t i;
char *p;
/*
* No symbols are actually needed in the pecoff file from the Mach-O
* file so create an empty symbol table.
*/
nsyments = 0;
/*
* Make sure the Mach-O file does not have any undefined symbols.
*/
st = arch->object->st;
object_addr = arch->object->object_addr;
syms = (struct nlist *)(object_addr + st->symoff);
strs = object_addr + st->stroff;
if(swapped)
swap_nlist(syms, st->nsyms, host_byte_sex);
found_undef = FALSE;
for(i = 0; i < st->nsyms; i++){
if((syms[i].n_type & N_STAB) != 0)
continue;
if((syms[i].n_type & N_TYPE) == N_UNDF){
if(found_undef == FALSE){
error("input file: %s contains undefined symbols:",
arch->file_name);
}
found_undef = TRUE;
if(syms[i].n_un.n_strx != 0)
printf("%s\n", strs + syms[i].n_un.n_strx);
else
printf("symbol at index %u is undefined but has NULL "
"name (like a malformed Mach-O file)\n", i);
}
}
if(found_undef == TRUE)
fatal("undefined symbols are unsupported for conversion to a "
"pecoff file");
#ifdef HACK_TO_MATCH_TEST_CASE
/*
* The hack implementation of this routine exist only in order to
* match the current ld_efi(1) script that uses objcopy(1) to make the
* pecoff file. So for that only the common symbols and bss symbols
* make it into the output pecoff file.
*
*/
/*
* First figure out the section number of the common and bss sections
* and address of those sections.
*/
n_sect = 1;
bss_n_sect = 0;
bss_addr = 0;
common_n_sect = 0;
common_addr = 0;
lc = arch->object->load_commands;
for(i = 0; i < arch->object->mh->ncmds; i++){
if(lc->cmd == LC_SEGMENT){
sg = (struct segment_command *)lc;
if(strcmp(sg->segname, SEG_DATA) == 0){
s = (struct section *)
((char *)sg + sizeof(struct segment_command));
for(j = 0; j < sg->nsects; j++){
if(strcmp(s->sectname, SECT_BSS) == 0){
bss_n_sect = n_sect;
bss_addr = s->addr;
}
else if(strcmp(s->sectname, SECT_COMMON) == 0){
common_n_sect = n_sect;
common_addr = s->addr;
}
s++;
n_sect++;
}
}
else{
n_sect += sg->nsects;
}
}
lc = (struct load_command *)((char *)lc + lc->cmdsize);
}
/*
* Count the number of the common and bss sections symbols and add up
* the size of their strings. Note the size of long section names is
* already accounted for in strsize by the code in process_32bit_arch().
*/
for(i = 0; i < st->nsyms; i++){
if((syms[i].n_type & N_STAB) == 0 &&
(syms[i].n_type & N_TYPE) == N_SECT &&
(syms[i].n_sect == bss_n_sect ||
syms[i].n_sect == common_n_sect)){
nsyments++;
if(syms[i].n_un.n_strx != 0){
size = strlen(strs + syms[i].n_un.n_strx);
if(size > E_SYMNMLEN)
strsize += strlen(strs + syms[i].n_un.n_strx) + 1;
}
}
}
#endif /* HACK_TO_MATCH_TEST_CASE */
/*
* Allocate space for the pecoff symbol table and string table.
*/
syments = allocate(nsyments * sizeof(struct syment));
memset(syments, '\0', nsyments * sizeof(struct syment));
strings = allocate(strsize);
/*
* Put the size of the string table in the string table first. Then
* the strings for the long section names right after the size.
*/
p = strings;
i = strsize;
if(swapped)
i = SWAP_INT(i);
memcpy(p, &i, sizeof(uint32_t));
p += sizeof(uint32_t);
memcpy(p, section_names, section_names_size);
p += section_names_size;
#ifdef HACK_TO_MATCH_TEST_CASE
/*
* First put in the bss symbols, again to match what is done by
* objcopy.
*/
j = 0;
for(i = 0; i < st->nsyms; i++){
if((syms[i].n_type & N_STAB) == 0 &&
(syms[i].n_type & N_TYPE) == N_SECT &&
syms[i].n_sect == bss_n_sect){
if(syms[i].n_un.n_strx != 0){
size = strlen(strs + syms[i].n_un.n_strx);
if(size > E_SYMNMLEN){
syments[j].e.e.e_zeroes = 0;
syments[j].e.e.e_offset = p - strings;
strcpy(p, strs + syms[i].n_un.n_strx);
p += strlen(strs + syms[i].n_un.n_strx) + 1;
}
else{
strncpy(syments[j].e.e_name,
strs + syms[i].n_un.n_strx, E_SYMNMLEN);
}
}
syments[j].e_value = syms[i].n_value - bss_addr;
syments[j].e_scnum = bss_scnum;
syments[j].e_type = 0;
syments[j].e_sclass = IMAGE_SYM_CLASS_EXTERNAL;
syments[j].e_numaux = 0;
j++;
}
}
/*
* Next put in the common symbols, again to match what is done by
* objcopy.
*/
for(i = 0; i < st->nsyms; i++){
if((syms[i].n_type & N_STAB) == 0 &&
(syms[i].n_type & N_TYPE) == N_SECT &&
syms[i].n_sect == common_n_sect){
if(syms[i].n_un.n_strx != 0){
size = strlen(strs + syms[i].n_un.n_strx);
if(size > E_SYMNMLEN){
syments[j].e.e.e_zeroes = 0;
syments[j].e.e.e_offset = p - strings;
strcpy(p, strs + syms[i].n_un.n_strx);
p += strlen(strs + syms[i].n_un.n_strx) + 1;
}
else{
strncpy(syments[j].e.e_name,
strs + syms[i].n_un.n_strx, E_SYMNMLEN);
}
}
syments[j].e_value = syms[i].n_value - common_addr;
syments[j].e_scnum = common_scnum;
syments[j].e_type = 0;
syments[j].e_sclass = IMAGE_SYM_CLASS_EXTERNAL;
syments[j].e_numaux = 0;
j++;
}
}
if(swapped)
swap_syment(syments, nsyments, target_byte_sex);
#endif /* HACK_TO_MATCH_TEST_CASE */
}
/*
* create_64bit_symbol_table() is called to process the input Mach-O file and
* create the pecoff symbol and string table.
*/
static
void
create_64bit_symbol_table(
struct arch *arch)
{
char *p;
uint32_t i;
char *object_addr;
struct symtab_command *st;
struct nlist_64 *syms64;
char *strs;
enum bool found_undef;
st = arch->object->st;
object_addr = arch->object->object_addr;
syms64 = (struct nlist_64 *)(object_addr + st->symoff);
strs = object_addr + st->stroff;
if(swapped)
swap_nlist_64(syms64, st->nsyms, host_byte_sex);
/*
* If the entry point option was specified then look for that symbol
* and set the entry point value.
*/
if(entry_point != NULL){
for(i = 0; i < st->nsyms; i++){
if((syms64[i].n_type & N_STAB) == 0 &&
syms64[i].n_un.n_strx != 0 &&
strcmp(strs + syms64[i].n_un.n_strx, entry_point) == 0){
entry = syms64[i].n_value;
break;
}
}
if(i == st->nsyms)
fatal("can't find symbol for -e %s in input file: %s",
entry_point, arch->file_name);
}
/*
* Make sure the Mach-O file does not have any undefined symbols.
*/
found_undef = FALSE;
for(i = 0; i < st->nsyms; i++){
if((syms64[i].n_type & N_STAB) != 0)
continue;
if((syms64[i].n_type & N_TYPE) == N_UNDF){
if(found_undef == FALSE){
error("input file: %s contains undefined symbols:",
arch->file_name);
}
found_undef = TRUE;
if(syms64[i].n_un.n_strx != 0)
printf("%s\n", strs + syms64[i].n_un.n_strx);
else
printf("symbol at index %u is undefined but has NULL "
"name (like a malformed Mach-O file)\n", i);
}
}
if(found_undef == TRUE)
fatal("undefined symbols are unsupported for conversion to a "
"pecoff file");
/*
* No symbols are actually needed in the pecoff file from the Mach-O
* file so create an empty symbol table.
*
* Set the number of symbols to zero and allocate the string table.
* Note the size of long section names is already accounted for in
* strsize by the code in process_64bit_arch().
*/
nsyments = 0;
strings = allocate(strsize);
/*
* Put the size of the string table in the string table first. Then
* the strings for the long section names right after the size.
*/
p = strings;
i = strsize;
if(swapped)
i = SWAP_INT(i);
memcpy(p, &i, sizeof(uint32_t));
p += sizeof(uint32_t);
memcpy(p, section_names, section_names_size);
}
/*
* create_base_reloc() is called to process the input Mach-O file and gather
* the info needed and then to create the base relocation entries.
*/
static
void
create_base_reloc(
struct arch *arch)
{
uint32_t ncmds, i, j;
uint64_t addr, first_addr;
struct load_command *lc;
struct segment_command *sg;
struct segment_command_64 *sg64;
struct section *s;
struct section_64 *s64;
struct relocation_info *relocs;
char *object_addr;
struct dysymtab_command *dyst;
if(arch->object->mh != NULL)
ncmds = arch->object->mh->ncmds;
else
ncmds = arch->object->mh64->ncmds;
dyst = arch->object->dyst;
object_addr = arch->object->object_addr;
first_addr = 0;
lc = arch->object->load_commands;
for(i = 0; i < ncmds; i++){
if(lc->cmd == LC_SEGMENT){
sg = (struct segment_command *)lc;
if(first_addr == 0)
first_addr = sg->vmaddr;
s = (struct section *)
((char *)sg + sizeof(struct segment_command));
for(j = 0; j < sg->nsects; j++){
relocs = (struct relocation_info *)(object_addr +
s[j].reloff);
if(swapped)
swap_relocation_info(relocs, s[j].nreloc,
host_byte_sex);
if(arch->object->mh_cputype == CPU_TYPE_I386)
gather_base_reloc_info(s[j].addr, relocs, s[j].nreloc,
CPU_TYPE_I386, 2, GENERIC_RELOC_VANILLA,
IMAGE_REL_BASED_HIGHLOW);
else if(arch->object->mh_cputype == CPU_TYPE_ARM)
gather_base_reloc_info(s[j].addr, relocs, s[j].nreloc,
CPU_TYPE_ARM, 2, GENERIC_RELOC_VANILLA,
IMAGE_REL_BASED_HIGHLOW);
if((s[j].flags & SECTION_TYPE) ==
S_NON_LAZY_SYMBOL_POINTERS){
for(addr = s[j].addr;
addr < s[j].addr + s[j].size;
addr += 4) {
add_base_reloc(addr, IMAGE_REL_BASED_HIGHLOW);
}
}
}
}
else if(lc->cmd == LC_SEGMENT_64){
sg64 = (struct segment_command_64 *)lc;
if(arch->object->mh_cputype == CPU_TYPE_X86_64) {
/*
* X86_64 relocations are relative to the first writable
* segment.
*/
/*
* But arm64 relocations are NOT relative to the first
* writable segment but just the first segment.
*/
if((first_addr == 0) &&
((sg64->initprot & VM_PROT_WRITE) != 0)) {
first_addr = sg64->vmaddr;
}
} else {
if(first_addr == 0)
first_addr = sg64->vmaddr;
}
s64 = (struct section_64 *)
((char *)sg64 + sizeof(struct segment_command_64));
for(j = 0; j < sg64->nsects; j++){
relocs = (struct relocation_info *)(object_addr +
s64[j].reloff);
if(swapped)
swap_relocation_info(relocs, s64[j].nreloc,
host_byte_sex);
if(arch->object->mh_cputype == CPU_TYPE_X86_64)
gather_base_reloc_info(s64[j].addr, relocs,
s64[j].nreloc, CPU_TYPE_X86_64, 3,
X86_64_RELOC_UNSIGNED, IMAGE_REL_BASED_DIR64);
else if(arch->object->mh_cputype == CPU_TYPE_ARM64)
gather_base_reloc_info(s64[j].addr, relocs,
s64[j].nreloc, CPU_TYPE_ARM64, 3,
ARM64_RELOC_UNSIGNED, IMAGE_REL_BASED_DIR64);
if((s64[j].flags & SECTION_TYPE) ==
S_NON_LAZY_SYMBOL_POINTERS){
for(addr = s64[j].addr;
addr < s64[j].addr + s64[j].size;
addr += 8) {
add_base_reloc(addr, IMAGE_REL_BASED_DIR64);
}
}
}
}
lc = (struct load_command *)((char *)lc + lc->cmdsize);
}
if(dyst != NULL && dyst->nlocrel != 0){
relocs = (struct relocation_info *)(object_addr +
dyst->locreloff);
if(swapped)
swap_relocation_info(relocs, dyst->nlocrel, host_byte_sex);
if(arch->object->mh_cputype == CPU_TYPE_I386)
gather_base_reloc_info(first_addr, relocs, dyst->nlocrel,
CPU_TYPE_I386, 2, GENERIC_RELOC_VANILLA,
IMAGE_REL_BASED_HIGHLOW);
else if(arch->object->mh_cputype == CPU_TYPE_ARM)
gather_base_reloc_info(first_addr, relocs, dyst->nlocrel,
CPU_TYPE_ARM, 2, GENERIC_RELOC_VANILLA,
IMAGE_REL_BASED_HIGHLOW);
else if(arch->object->mh_cputype == CPU_TYPE_X86_64)
gather_base_reloc_info(first_addr, relocs, dyst->nlocrel,
CPU_TYPE_X86_64, 3, X86_64_RELOC_UNSIGNED,
IMAGE_REL_BASED_DIR64);
else if(arch->object->mh_cputype == CPU_TYPE_ARM64)
gather_base_reloc_info(first_addr, relocs, dyst->nlocrel,
CPU_TYPE_ARM64, 3, ARM64_RELOC_UNSIGNED,
IMAGE_REL_BASED_DIR64);
}
/*
if(dyst != NULL && dyst->nextrel != 0)
; TODO error if there are external relocation entries */
/*
* Now with all the info gathered make the base relocation entries.
*/
make_base_relocs();
}
/*
* gather_base_reloc_info() is passed the base address for the set of Mach-O
* relocation entries. And is passed the cpu_type, length and macho_reloc_type
* to look for and the base_reloc_type to create if found.
*/
static
void
gather_base_reloc_info(
uint32_t addr,
struct relocation_info *relocs,
uint32_t nreloc,
cpu_type_t cpu_type,
uint32_t length,
int macho_reloc_type,
int base_reloc_type)
{
uint32_t i, r_address, r_pcrel, r_length, r_extern, r_type;
struct scattered_relocation_info *sreloc;
for(i = 0; i < nreloc; i++){
if((relocs[i].r_address & R_SCATTERED) != 0){
sreloc = (struct scattered_relocation_info *)(relocs + i);
r_address = sreloc->r_address;
r_pcrel = sreloc->r_pcrel;
r_length = sreloc->r_length;
r_type = (enum reloc_type_generic)sreloc->r_type;
r_extern = 0;
}
else{
r_address = relocs[i].r_address;
r_pcrel = relocs[i].r_pcrel;
r_length = relocs[i].r_length;
r_extern = relocs[i].r_extern;
r_type = (enum reloc_type_generic)relocs[i].r_type;
}
if(r_extern == 0 && r_pcrel == 0 &&
r_length == length && r_type == macho_reloc_type)
add_base_reloc(addr + r_address, base_reloc_type);
else
; /* TODO add checking and error messages here */
if((relocs[i].r_address & R_SCATTERED) == 0){
if(reloc_has_pair(cpu_type, relocs[i].r_type))
i++;
}
else{
sreloc = (struct scattered_relocation_info *)relocs + i;
if(reloc_has_pair(cpu_type, sreloc->r_type))
i++;
}
}
}
/*
* add_base_reloc() is passed a addr and a type for a base relocation entry to
* add to the list.
*/
static
void
add_base_reloc(
uint64_t addr,
uint32_t type)
{
static int max = 0;
struct base_reloc *new_base_relocs;
if(!max){
max = 128;
base_relocs = (struct base_reloc *)
malloc(max * sizeof(struct base_reloc));
}
if(nbase_reloc >= max){
new_base_relocs = malloc(2 * max * sizeof(struct base_reloc));
memcpy(new_base_relocs, base_relocs,
max * sizeof(struct base_reloc));
max *= 2;
free(base_relocs);
base_relocs = new_base_relocs;
}
base_relocs[nbase_reloc].addr = addr;
base_relocs[nbase_reloc].type = type;
nbase_reloc++;
}
/*
* The base relocation table in a PECOFF file is divided into blocks. Each
* block represents the base relocations for a 4K page. Each block must start
* on a 32-bit boundary. Which is why one "nop" base relocation entry may be
* be added as padding in a block.
*/
#define MAX_BLOCK_OFFSET 0x1000
#define BLOCK_MASK (MAX_BLOCK_OFFSET-1)
/*
* make_base_relocs() takes the info for the base relocation entries gathered
* and creates the fixup blocks as they would be in a PECOFF file and sets the
* static variables reloc_contents and reloc_size to the pointer to contents
* and the size of that contents.
*/
static
void
make_base_relocs(
void)
{
int blockcnt;
int i, entries;
uint64_t base;
int size, s_size, pad;
char *fb;
struct base_relocation_block_header *h;
struct base_relocation_entry *b;
uint32_t offset;
blockcnt = 0;
/*
* After we create each base relocation block we will allocate space
* for it in the .reloc section contents buffer and copy it into the
* buffer.
*/
reloc_size = 0;
reloc_contents = NULL;
/*
* If there are no base relocation entries return so we don't create a
* base relocation block with 0 entries.
*/
if(nbase_reloc == 0)
return;
qsort(base_relocs, nbase_reloc, sizeof(struct base_reloc),
(int (*)(const void *, const void *))cmp_base_relocs);
/*
* The size of the base relocation tables must be a multiple of 4 bytes.
* so we may need to add one relocation entry as padding. We make this
* fixup block large enought to hold all the base relocation entries.
* But it will be broken up for the base relocation entries for each
* each group that refers to the same 4K page.
*/
size = sizeof(struct base_relocation_block_header) +
(nbase_reloc + 1) * sizeof(struct base_relocation_entry);
fb = malloc(size);
entries = 0;
base = base_relocs[0].addr & ~BLOCK_MASK;
h = (struct base_relocation_block_header *)fb;
b = (struct base_relocation_entry *)
(fb + sizeof(struct base_relocation_block_header));
for(i = 0; i < nbase_reloc; i++){
offset = base_relocs[i].addr - base;
if(offset >= MAX_BLOCK_OFFSET) {
/* add padding if needed */
if((entries % 2) != 0){
b[entries].type = IMAGE_REL_BASED_ABSOLUTE;
b[entries].offset = 0;
entries++;
}
h->page_rva = base;
size = sizeof(struct base_relocation_block_header) +
entries * sizeof(struct base_relocation_entry);
h->block_size = size;
if(swapped){
swap_base_relocation_block_header(h,
target_byte_sex);
swap_base_relocation_entry(b, entries,
target_byte_sex);
}
/* copy this finished block into the .reloc contents buffer */
reloc_contents = reallocate(reloc_contents, reloc_size + size);
memcpy(reloc_contents + reloc_size, fb, size);
reloc_size += size;
entries = 0;
blockcnt++;
base = base_relocs[i].addr & ~BLOCK_MASK;
offset = base_relocs[i].addr - base;
}
b[entries].type = base_relocs[i].type;
b[entries].offset = offset;
entries++;
}
/* add padding if needed */
if((entries % 2) != 0){
b[entries].type = IMAGE_REL_BASED_ABSOLUTE;
b[entries].offset = 0;
entries++;
}
h->page_rva = base;
size = sizeof(struct base_relocation_block_header) +
entries * sizeof(struct base_relocation_entry);
h->block_size = size;
if(swapped){
swap_base_relocation_block_header(h, target_byte_sex);
swap_base_relocation_entry(b, entries, target_byte_sex);
}
/* copy this last block into the .reloc contents buffer */
reloc_contents = reallocate(reloc_contents, reloc_size + size);
memcpy(reloc_contents + reloc_size, fb, size);
reloc_size += size;
/*
* The make the relocs buffer the s_size rounded to file_alignment and
* zero out the padding
*/
s_size = rnd(reloc_size, file_alignment);
pad = s_size - reloc_size;
reloc_contents = reallocate(reloc_contents, s_size);
memset(reloc_contents + reloc_size, '\0', pad);
blockcnt++;
free(fb);
}
static
int
cmp_base_relocs(
struct base_reloc *x1,
struct base_reloc *x2)
{
if(x1->addr < x2->addr)
return(-1);
if(x1->addr == x2->addr)
return(0);
/* x1->addr > x2->addr */
return(1);
}
/*
* create_debug() is called to create the .debug section contents from
* the -d filename argument.
*/
static
void
create_debug(
struct arch *arch)
{
char *p;
uint32_t i, ncmds, s_size;
struct load_command *lc;
struct uuid_command *uuid;
/*
* Allocate space for everything that will be in the .debug section:
* the debug_directory_entry struct
* the mtoc_debug_info struct
* the name of the -d filename argument null terminated.
*/
debug_size = sizeof(struct debug_directory_entry) +
sizeof(struct mtoc_debug_info) +
strlen(debug_filename) + 1;
/*
* The make the debug buffer the s_size rounded to the file_alignment
* and also zero out the padding
*/
s_size = rnd(debug_size, file_alignment);
debug_contents = allocate(s_size);
memset(debug_contents, '\0', s_size);
/*
* Set up pointers to all the parts to be filled in.
*/
p = debug_contents;
dde = (struct debug_directory_entry *)p;
p += sizeof(struct debug_directory_entry);
mdi = (struct mtoc_debug_info *)p;
p += sizeof(struct mtoc_debug_info);
dde->Characteristics = 0;
dde->TimeDateStamp = time(NULL);
dde->MajorVersion = 0;
dde->MinorVersion = 0;
dde->Type = IMAGE_DEBUG_TYPE_CODEVIEW;
dde->SizeOfData = sizeof(struct mtoc_debug_info) +
strlen(debug_filename) + 1;
/*
* These two will be filled in later when address and offsets
* are known.
*/
dde->AddressOfRawData = 0;
dde->PointerToRawData = 0;
mdi->Signature = MTOC_SIGNATURE;
if(arch->object->mh != NULL)
ncmds = arch->object->mh->ncmds;
else
ncmds = arch->object->mh64->ncmds;
lc = arch->object->load_commands;
for(i = 0; i < ncmds; i++){
if(lc->cmd == LC_UUID){
uuid = (struct uuid_command *)lc;
if (debug_uuid != NULL) {
string_to_uuid (debug_uuid, uuid->uuid);
}
/* Swizzle UUID to match EFI GUID definition */
mdi->uuid[0] = uuid->uuid[3];
mdi->uuid[1] = uuid->uuid[2];
mdi->uuid[2] = uuid->uuid[1];
mdi->uuid[3] = uuid->uuid[0];
mdi->uuid[4] = uuid->uuid[5];
mdi->uuid[5] = uuid->uuid[4];
mdi->uuid[6] = uuid->uuid[7];
mdi->uuid[7] = uuid->uuid[6];
mdi->uuid[8] = uuid->uuid[8];
mdi->uuid[9] = uuid->uuid[9];
mdi->uuid[10] = uuid->uuid[10];
mdi->uuid[11] = uuid->uuid[11];
mdi->uuid[12] = uuid->uuid[12];
mdi->uuid[13] = uuid->uuid[13];
mdi->uuid[14] = uuid->uuid[14];
mdi->uuid[15] = uuid->uuid[15];
break;
}
lc = (struct load_command *)((char *)lc + lc->cmdsize);
}
strcpy(p, debug_filename);
}
/*
* set_debug_addrs_and_offsets() is called after the .debug section's address
* and offset has been set and this routine sets the other needed addresses
* and offsets in the section contents. And swaps the section contents if
* needed for output.
*/
static
void
set_debug_addrs_and_offsets(
void)
{
dde->AddressOfRawData = debug_scnhdr->s_vaddr +
sizeof(struct debug_directory_entry);
dde->PointerToRawData = debug_scnhdr->s_scnptr +
sizeof(struct debug_directory_entry);
if(swapped){
swap_debug_directory_entry(dde, target_byte_sex);
swap_mtoc_debug_info(mdi, target_byte_sex);
}
}
/*
* checksum() calculates the value for the CheckSum field in the optional
* header from the bytes in the output buffer passed to it which has the
* size output_size.
*/
static
uint32_t
checksum(
unsigned char *buf)
{
uint32_t i, v, t;
t = 0;
for(i = 0; i < output_size; i += 2){
if(output_size - i == 1)
v = buf[i];
else
v = buf[i] + (buf[i+1] << 8);
t += v;
t = 0xffff & (t + (t >> 0x10));
}
return(0xffff & (t + (t >> 0x10)));
}
/*
* string_to_uuid() creates a 128-bit uuid from a well-formatted UUID string
* (i.e. aabbccdd-eeff-gghh-iijj-kkllmmnnoopp)
*/
static
void
string_to_uuid(
char *string,
uint8_t *uuid)
{
uint8_t count;
count = sscanf (string, UUID_FORMAT_STRING,
&uuid[0], &uuid[1], &uuid[2], &uuid[3],
&uuid[4], &uuid[5], &uuid[6], &uuid[7],
&uuid[8], &uuid[9], &uuid[10], &uuid[11],
&uuid[12], &uuid[13], &uuid[14], &uuid[15]);
if (count != 16) {
fatal ("invalid UUID specified for -u option");
}
}
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