#include <ar.h>
#include <stdlib.h>
#include <memory.h>
#include <errno.h>
#include <libelf.h>
#include <sys/mman.h>
#include "decl.h"
#include "msg.h"
static const char armag[] = ARMAG;
#include <crt_externs.h>
#include <mach/mach.h>
#include <mach-o/loader.h>
#include <mach-o/dyld.h>
#include <mach-o/fat.h>
#include <sys/sysctl.h>
static cpu_type_t current_program_arch(void)
{
cpu_type_t current_arch = (_NSGetMachExecuteHeader())->cputype;
return current_arch;
}
static cpu_type_t current_kernel_arch(void)
{
struct host_basic_info hi;
unsigned int size;
kern_return_t kret;
cpu_type_t current_arch;
int ret, mib[4];
size_t len;
struct kinfo_proc kp;
size = sizeof(hi)/sizeof(int);
kret = host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hi, &size);
if (kret != KERN_SUCCESS) {
return 0;
}
current_arch = hi.cpu_type;
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PID;
mib[3] = 0;
len = sizeof(kp);
ret = sysctl(mib, sizeof(mib)/sizeof(mib[0]), &kp, &len, NULL, 0);
if (ret == -1) {
return 0;
}
if (kp.kp_proc.p_flag & P_LP64) {
current_arch |= CPU_ARCH_ABI64;
}
return current_arch;
}
static Elf *
_elf_regular(int fd, unsigned flags)
{
Elf *elf;
if ((elf = (Elf *)calloc(1, sizeof (Elf))) == 0) {
_elf_seterr(EMEM_ELF, errno);
return (0);
}
NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*elf))
elf->ed_fd = fd;
elf->ed_myflags |= flags;
if (_elf_inmap(elf) != OK_YES) {
free(elf);
return (0);
}
NOTE(NOW_VISIBLE_TO_OTHER_THREADS(*elf))
return (elf);
}
static Elf *
_elf_config(Elf * elf)
{
char * base;
unsigned encode;
ELFRWLOCKINIT(&elf->ed_rwlock);
base = elf->ed_ident;
if ((elf->ed_fsz >= EI_NIDENT) &&
(_elf_vm(elf, (size_t)0, (size_t)EI_NIDENT) == OK_YES) &&
(base[EI_MAG0] == ELFMAG0) &&
(base[EI_MAG1] == ELFMAG1) &&
(base[EI_MAG2] == ELFMAG2) &&
(base[EI_MAG3] == ELFMAG3)) {
_elf_seterr(EREQ_NOTSUP, 0);
return (0);
}
if ((elf->ed_fsz >= sizeof(struct fat_header)) &&
(_elf_vm(elf, (size_t)0, (size_t)sizeof(struct fat_header)) == OK_YES) &&
(FAT_MAGIC == *(unsigned int *)(elf->ed_ident) ||
FAT_CIGAM == *(unsigned int *)(elf->ed_ident)))
{
struct fat_header *fat_header = (struct fat_header *)(elf->ed_ident);
int nfat_arch = OSSwapBigToHostInt32(fat_header->nfat_arch);
int end_of_archs = sizeof(struct fat_header) + nfat_arch * sizeof(struct fat_arch);
struct fat_arch *arch = (struct fat_arch *)(elf->ed_ident + sizeof(struct fat_header));
cpu_type_t cputype = (elf->ed_myflags & EDF_RDKERNTYPE) ? current_kernel_arch() :current_program_arch();
if (end_of_archs > elf->ed_fsz) {
_elf_seterr(EIO_VM, errno);
return 0;
}
for (; nfat_arch-- > 0; arch++) {
if(((cpu_type_t)OSSwapBigToHostInt32(arch->cputype)) == cputype) {
elf->ed_ident += OSSwapBigToHostInt32(arch->offset);
elf->ed_image += OSSwapBigToHostInt32(arch->offset);
elf->ed_fsz -= OSSwapBigToHostInt32(arch->offset);
elf->ed_imagesz -= OSSwapBigToHostInt32(arch->offset);
break;
}
}
}
if ((elf->ed_fsz >= sizeof(struct mach_header)) &&
(_elf_vm(elf, (size_t)0, (size_t)sizeof(struct mach_header)) == OK_YES) &&
(MH_MAGIC == *(unsigned int *)(elf->ed_image) ||
MH_CIGAM == *(unsigned int *)(elf->ed_image))) {
struct mach_header *mh = (struct mach_header *)elf->ed_image;
struct load_command *thisLC = (struct load_command *)(&(mh[1]));
int i, n = 0;
for (i = 0; i < mh->ncmds; i++) {
int cmd = thisLC->cmd, cmdsize = thisLC->cmdsize;
switch(cmd) {
case LC_SEGMENT:
{
struct segment_command *thisSG = (struct segment_command *)thisLC;
n += thisSG->nsects;
break;
}
case LC_SYMTAB:
n += 2;
break;
default:
break;
}
thisLC = (struct load_command *) ((caddr_t) thisLC + cmdsize);
}
if (0 == (elf->ed_ident = malloc(sizeof(Elf32_Ehdr)))) {
_elf_seterr(EMEM_ELF, errno);
return (0);
}
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_MAG0] = 'M';
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_MAG1] = 'a';
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_MAG2] = 'c';
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_MAG3] = 'h';
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_CLASS] = ELFCLASS32;
#if defined(__BIG_ENDIAN__)
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_DATA] = ELFDATA2MSB;
#else
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_DATA] = ELFDATA2LSB;
#endif
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_VERSION] = EV_CURRENT;
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_OSABI] = ELFOSABI_NONE;
((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_ABIVERSION] = 0;
((Elf32_Ehdr *)(elf->ed_ident))->e_type = ET_NONE;
((Elf32_Ehdr *)(elf->ed_ident))->e_machine = EM_NONE;
((Elf32_Ehdr *)(elf->ed_ident))->e_version = EV_CURRENT;
((Elf32_Ehdr *)(elf->ed_ident))->e_phoff = 0;
((Elf32_Ehdr *)(elf->ed_ident))->e_shoff = sizeof(struct mach_header);
((Elf32_Ehdr *)(elf->ed_ident))->e_ehsize = sizeof(Elf32_Ehdr);
((Elf32_Ehdr *)(elf->ed_ident))->e_phentsize = sizeof(Elf32_Phdr);
((Elf32_Ehdr *)(elf->ed_ident))->e_phnum = 0;
((Elf32_Ehdr *)(elf->ed_ident))->e_shentsize = sizeof(Elf32_Shdr);
((Elf32_Ehdr *)(elf->ed_ident))->e_shnum = n + 1;
((Elf32_Ehdr *)(elf->ed_ident))->e_shstrndx = SHN_MACHO;
elf->ed_kind = ELF_K_MACHO;
elf->ed_class = ((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_CLASS];
#if defined(__BIG_ENDIAN__)
elf->ed_encode = ELFDATA2MSB;
#else
elf->ed_encode = ELFDATA2LSB;
#endif
elf->ed_version = ((Elf32_Ehdr *)(elf->ed_ident))->e_ident[EI_VERSION];
elf->ed_identsz = EI_NIDENT;
ELFACCESSDATA(encode, _elf_encode)
if ((elf->ed_vm == 0) && ((elf->ed_myflags & EDF_WRITE) == 0) &&
(elf->ed_encode != encode)) {
if (mprotect((char *)elf->ed_image, elf->ed_imagesz,
PROT_READ|PROT_WRITE) == -1) {
_elf_seterr(EIO_VM, errno);
return (0);
}
}
return (elf);
}
if ((elf->ed_fsz >= sizeof(struct mach_header_64)) &&
(_elf_vm(elf, (size_t)0, (size_t)sizeof(struct mach_header_64)) == OK_YES) &&
(MH_MAGIC_64 == *(unsigned int *)(elf->ed_image) ||
MH_CIGAM_64 == *(unsigned int *)(elf->ed_image))) {
struct mach_header_64 *mh64 = (struct mach_header_64 *)elf->ed_image;
struct load_command *thisLC = (struct load_command *)(&(mh64[1]));
int i, n = 0;
for (i = 0; i < mh64->ncmds; i++) {
int cmd = thisLC->cmd, cmdsize = thisLC->cmdsize;
switch(cmd) {
case LC_SEGMENT_64:
{
struct segment_command_64 *thisSG64 = (struct segment_command_64 *)thisLC;
n += thisSG64->nsects;
break;
}
case LC_SYMTAB:
n += 2;
break;
default:
break;
}
thisLC = (struct load_command *) ((caddr_t) thisLC + cmdsize);
}
if (0 == (elf->ed_ident = malloc(sizeof(Elf64_Ehdr)))) {
_elf_seterr(EMEM_ELF, errno);
return (0);
}
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_MAG0] = 'M';
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_MAG1] = 'a';
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_MAG2] = 'c';
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_MAG3] = 'h';
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_CLASS] = ELFCLASS64;
#if defined(__BIG_ENDIAN__)
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_DATA] = ELFDATA2MSB;
#else
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_DATA] = ELFDATA2LSB;
#endif
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_VERSION] = EV_CURRENT;
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_OSABI] = ELFOSABI_NONE;
((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_ABIVERSION] = 0;
((Elf64_Ehdr *)(elf->ed_ident))->e_type = ET_NONE;
((Elf64_Ehdr *)(elf->ed_ident))->e_machine = EM_NONE;
((Elf64_Ehdr *)(elf->ed_ident))->e_version = EV_CURRENT;
((Elf64_Ehdr *)(elf->ed_ident))->e_phoff = 0;
((Elf64_Ehdr *)(elf->ed_ident))->e_shoff = sizeof(struct mach_header_64);
((Elf64_Ehdr *)(elf->ed_ident))->e_ehsize = sizeof(Elf64_Ehdr);
((Elf64_Ehdr *)(elf->ed_ident))->e_phentsize = sizeof(Elf64_Phdr);
((Elf64_Ehdr *)(elf->ed_ident))->e_phnum = 0;
((Elf64_Ehdr *)(elf->ed_ident))->e_shentsize = sizeof(Elf64_Shdr);
((Elf64_Ehdr *)(elf->ed_ident))->e_shnum = n + 1;
((Elf64_Ehdr *)(elf->ed_ident))->e_shstrndx = SHN_MACHO_64;
elf->ed_kind = ELF_K_MACHO;
elf->ed_class = ((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_CLASS];
#if defined(__BIG_ENDIAN__)
elf->ed_encode = ELFDATA2MSB;
#else
elf->ed_encode = ELFDATA2LSB;
#endif
elf->ed_version = ((Elf64_Ehdr *)(elf->ed_ident))->e_ident[EI_VERSION];
elf->ed_identsz = EI_NIDENT;
ELFACCESSDATA(encode, _elf_encode)
if ((elf->ed_vm == 0) && ((elf->ed_myflags & EDF_WRITE) == 0) &&
(elf->ed_encode != encode)) {
if (mprotect((char *)elf->ed_image, elf->ed_imagesz,
PROT_READ|PROT_WRITE) == -1) {
_elf_seterr(EIO_VM, errno);
return (0);
}
}
return (elf);
}
if ((elf->ed_fsz >= SARMAG) &&
(_elf_vm(elf, (size_t)0, (size_t)SARMAG) == OK_YES) &&
(memcmp(base, armag, SARMAG) == 0)) {
_elf_seterr(EREQ_NOTSUP, 0);
return (0);
}
elf->ed_kind = ELF_K_NONE;
if ((elf->ed_identsz = elf->ed_fsz) > 512)
elf->ed_identsz = 512;
return (elf);
}
Elf *
elf_begin(int fd, Elf_Cmd cmd, Elf *ref)
{
register Elf *elf;
unsigned work;
unsigned flags = 0;
ELFACCESSDATA(work, _elf_work)
if (work == EV_NONE)
{
_elf_seterr(ESEQ_VER, 0);
return (0);
}
switch (cmd) {
default:
_elf_seterr(EREQ_BEGIN, 0);
return (0);
case ELF_C_NULL:
return (0);
case ELF_C_WRITE:
if ((elf = (Elf *)calloc(1, sizeof (Elf))) == 0) {
_elf_seterr(EMEM_ELF, errno);
return (0);
}
NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*elf))
ELFRWLOCKINIT(&elf->ed_rwlock);
elf->ed_fd = fd;
elf->ed_activ = 1;
elf->ed_myflags |= EDF_WRITE;
NOTE(NOW_VISIBLE_TO_OTHER_THREADS(*elf))
return (elf);
case ELF_C_RDWR:
flags = EDF_WRITE | EDF_READ;
break;
case ELF_C_READ:
flags = EDF_READ;
break;
case ELF_C_RDKERNTYPE:
flags = EDF_READ | EDF_RDKERNTYPE;
break;
}
if (ref == 0) {
if ((elf = _elf_regular(fd, flags)) == 0)
return (0);
} else {
ELFWLOCK(ref);
if ((ref->ed_myflags & flags) != flags) {
_elf_seterr(EREQ_RDWR, 0);
ELFUNLOCK(ref);
return (0);
}
if (ref->ed_kind != ELF_K_AR) {
++ref->ed_activ;
ELFUNLOCK(ref);
return (ref);
}
_elf_seterr(EREQ_NOTSUP, 0);
ELFUNLOCK(ref);
return (0);
}
NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*elf))
elf->ed_activ = 1;
elf = _elf_config(elf);
NOTE(NOW_VISIBLE_TO_OTHER_THREADS(*elf))
return (elf);
}