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upx/src/p_mach.cpp
John Reiser a187cb6c9c work on stub for powerpc-darwin.dylib-entry.S
2009-05-29 22:08:08 -07:00

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/* p_mach.cpp -- pack Mach Object executable
This file is part of the UPX executable compressor.
Copyright (C) 2004-2009 John Reiser
All Rights Reserved.
UPX and the UCL library are free software; you can redistribute them
and/or modify them under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) 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; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
John Reiser
<jreiser@users.sourceforge.net>
*/
#include "conf.h"
#include "file.h"
#include "filter.h"
#include "linker.h"
#include "packer.h"
#include "p_mach.h"
#include "ui.h"
static const
#include "stub/powerpc-darwin.macho-entry.h"
static const
#include "stub/powerpc-darwin.macho-fold.h"
static const
#include "stub/i386-darwin.macho-entry.h"
static const
#include "stub/i386-darwin.macho-fold.h"
static const
#include "stub/arm-darwin.macho-entry.h"
static const
#include "stub/arm-darwin.macho-fold.h"
// Packing a Darwin (Mach-o) Mac OS X dylib (dynamic shared library)
// is restricted. UPX gets control as the -init function, at the very
// end of processing by dyld. Relocation, loading of dependent libraries,
// etc., already have taken place before decompression. So the Mach-o
// headers, the __IMPORT segment, the __LINKEDIT segment, anything
// that is modifed by relocation, etc., cannot be compressed.
// We simplify arbitrarily by compressing only the __TEXT segment,
// which must be the first segment.
static const
#include "stub/i386-darwin.dylib-entry.h"
// The runtime stub for the dyld -init routine does not use "fold"ed code.
//#include "stub/i386-darwin.dylib-fold.h"
static const
#include "stub/powerpc-darwin.dylib-entry.h"
template <class T>
PackMachBase<T>::PackMachBase(InputFile *f, unsigned cputype, unsigned filetype,
unsigned flavor, unsigned count, unsigned size) :
super(f), my_cputype(cputype), my_filetype(filetype), my_thread_flavor(flavor),
my_thread_state_word_count(count), my_thread_command_size(size),
n_segment(0), rawmseg(NULL), msegcmd(NULL), o_routines_cmd(0),
prev_init_address(0)
{
MachClass::compileTimeAssertions();
bele = N_BELE_CTP::getRTP((const BeLePolicy*) NULL);
}
template <class T>
PackMachBase<T>::~PackMachBase()
{
delete [] rawmseg;
delete [] msegcmd;
}
PackDylibI386::PackDylibI386(InputFile *f) : super(f)
{
my_filetype = Mach_header::MH_DYLIB;
}
PackDylibPPC32::PackDylibPPC32(InputFile *f) : super(f)
{
my_filetype = Mach_header::MH_DYLIB;
}
template <class T>
const int *PackMachBase<T>::getCompressionMethods(int method, int level) const
{
// There really is no LE bias.
return Packer::getDefaultCompressionMethods_le32(method, level);
}
const int *PackMachARMEL::getCompressionMethods(int method, int level) const
{
return Packer::getDefaultCompressionMethods_8(method, level);
}
const int *PackMachPPC32::getFilters() const
{
static const int filters[] = { 0xd0, FT_END };
return filters;
}
int const *PackMachI386::getFilters() const
{
static const int filters[] = { 0x49, FT_END };
return filters;
}
int const *PackMachARMEL::getFilters() const
{
static const int filters[] = { 0x50, FT_END };
return filters;
}
Linker *PackMachPPC32::newLinker() const
{
return new ElfLinkerPpc32;
}
Linker *PackMachI386::newLinker() const
{
return new ElfLinkerX86;
}
Linker *PackMachARMEL::newLinker() const
{
return new ElfLinkerArmLE;
}
template <class T>
void
PackMachBase<T>::addStubEntrySections(Filter const *)
{
addLoader("MACOS000", NULL);
//addLoader(getDecompressorSections(), NULL);
addLoader(
( M_IS_NRV2E(ph.method) ? "NRV_HEAD,NRV2E,NRV_TAIL"
: M_IS_NRV2D(ph.method) ? "NRV_HEAD,NRV2D,NRV_TAIL"
: M_IS_NRV2B(ph.method) ? "NRV_HEAD,NRV2B,NRV_TAIL"
: M_IS_LZMA(ph.method) ? "LZMA_ELF00,LZMA_DEC20,LZMA_DEC30"
: NULL), NULL);
if (hasLoaderSection("CFLUSH"))
addLoader("CFLUSH");
addLoader("ELFMAINY,IDENTSTR,+40,ELFMAINZ,FOLDEXEC", NULL);
}
void PackMachI386::addStubEntrySections(Filter const *ft)
{
int const n_mru = ft->n_mru; // FIXME: belongs to filter? packerf?
// entry to stub
addLoader("LEXEC000", NULL);
if (ft->id) {
{ // decompr, unfilter are separate
addLoader("LXUNF000", NULL);
addLoader("LXUNF002", NULL);
if (0x80==(ft->id & 0xF0)) {
if (256==n_mru) {
addLoader("MRUBYTE0", NULL);
}
else if (n_mru) {
addLoader("LXMRU005", NULL);
}
if (n_mru) {
addLoader("LXMRU006", NULL);
}
else {
addLoader("LXMRU007", NULL);
}
}
else if (0x40==(ft->id & 0xF0)) {
addLoader("LXUNF008", NULL);
}
addLoader("LXUNF010", NULL);
}
if (n_mru) {
addLoader("LEXEC009", NULL);
}
}
addLoader("LEXEC010", NULL);
addLoader(getDecompressorSections(), NULL);
addLoader("LEXEC015", NULL);
if (ft->id) {
{ // decompr, unfilter are separate
if (0x80!=(ft->id & 0xF0)) {
addLoader("LXUNF042", NULL);
}
}
addFilter32(ft->id);
{ // decompr, unfilter are separate
if (0x80==(ft->id & 0xF0)) {
if (0==n_mru) {
addLoader("LXMRU058", NULL);
}
}
addLoader("LXUNF035", NULL);
}
}
else {
addLoader("LEXEC017", NULL);
}
addLoader("IDENTSTR", NULL);
addLoader("LEXEC020", NULL);
addLoader("FOLDEXEC", NULL);
}
void PackMachARMEL::addStubEntrySections(Filter const */*ft*/)
{
addLoader("MACHMAINX", NULL);
//addLoader(getDecompressorSections(), NULL);
addLoader(
( M_IS_NRV2E(ph.method) ? "NRV_HEAD,NRV2E,NRV_TAIL"
: M_IS_NRV2D(ph.method) ? "NRV_HEAD,NRV2D,NRV_TAIL"
: M_IS_NRV2B(ph.method) ? "NRV_HEAD,NRV2B,NRV_TAIL"
: M_IS_LZMA(ph.method) ? "LZMA_ELF00,+80C,LZMA_DEC20,LZMA_DEC30"
: NULL), NULL);
if (hasLoaderSection("CFLUSH"))
addLoader("CFLUSH");
addLoader("MACHMAINY,IDENTSTR,+40,MACHMAINZ,FOLDEXEC", NULL);
}
template <class T>
void PackMachBase<T>::defineSymbols(Filter const *)
{
// empty
}
template <class T>
void
PackMachBase<T>::buildMachLoader(
upx_byte const *const proto,
unsigned const szproto,
upx_byte const *const fold,
unsigned const szfold,
Filter const *ft
)
{
initLoader(proto, szproto);
struct b_info h; memset(&h, 0, sizeof(h));
unsigned fold_hdrlen = 0;
if (0 < szfold) {
h.sz_unc = (szfold < fold_hdrlen) ? 0 : (szfold - fold_hdrlen);
h.b_method = (unsigned char) ph.method;
h.b_ftid = (unsigned char) ph.filter;
h.b_cto8 = (unsigned char) ph.filter_cto;
}
unsigned char const *const uncLoader = fold_hdrlen + fold;
unsigned char *const cprLoader = new unsigned char[sizeof(h) + h.sz_unc];
if (0 < szfold) {
unsigned sz_cpr = 0;
int r = upx_compress(uncLoader, h.sz_unc, sizeof(h) + cprLoader, &sz_cpr,
NULL, ph.method, 10, NULL, NULL );
h.sz_cpr = sz_cpr;
if (r != UPX_E_OK || h.sz_cpr >= h.sz_unc)
throwInternalError("loader compression failed");
}
memcpy(cprLoader, &h, sizeof(h));
// This adds the definition to the "library", to be used later.
linker->addSection("FOLDEXEC", cprLoader, sizeof(h) + h.sz_cpr, 0);
delete [] cprLoader;
int const GAP = 128; // must match stub/l_mac_ppc.S
int const NO_LAP = 64; // must match stub/src/*darwin*.S
segcmdo.vmsize += h.sz_unc - h.sz_cpr + GAP + NO_LAP;
addStubEntrySections(ft);
defineSymbols(ft);
relocateLoader();
}
void
PackMachPPC32::buildLoader(const Filter *ft)
{
buildMachLoader(
stub_powerpc_darwin_macho_entry, sizeof(stub_powerpc_darwin_macho_entry),
stub_powerpc_darwin_macho_fold, sizeof(stub_powerpc_darwin_macho_fold), ft );
}
void
PackMachI386::buildLoader(const Filter *ft)
{
buildMachLoader(
stub_i386_darwin_macho_entry, sizeof(stub_i386_darwin_macho_entry),
stub_i386_darwin_macho_fold, sizeof(stub_i386_darwin_macho_fold), ft );
}
void
PackMachARMEL::buildLoader(const Filter *ft)
{
buildMachLoader(
stub_arm_darwin_macho_entry, sizeof(stub_arm_darwin_macho_entry),
stub_arm_darwin_macho_fold, sizeof(stub_arm_darwin_macho_fold), ft );
}
void
PackDylibI386::buildLoader(const Filter *ft)
{
buildMachLoader(
stub_i386_darwin_dylib_entry, sizeof(stub_i386_darwin_dylib_entry),
0, 0, ft );
}
void
PackDylibPPC32::buildLoader(const Filter *ft)
{
buildMachLoader(
stub_powerpc_darwin_dylib_entry, sizeof(stub_powerpc_darwin_dylib_entry),
0, 0, ft );
}
template <class T>
void PackMachBase<T>::patchLoader() { }
template <class T>
void PackMachBase<T>::updateLoader(OutputFile *) {}
template <class T>
void PackMachBase<T>::patchLoaderChecksum()
{
unsigned char *const ptr = getLoader();
l_info *const lp = &linfo;
// checksum for loader; also some PackHeader info
lp->l_checksum = 0;
lp->l_magic = UPX_MAGIC_LE32; // LE32 always
lp->l_lsize = (unsigned short) lsize;
lp->l_version = (unsigned char) ph.version;
lp->l_format = (unsigned char) ph.format;
// INFO: lp->l_checksum is currently unused
lp->l_checksum = upx_adler32(ptr, lsize);
}
template <class T>
int __acc_cdecl_qsort
PackMachBase<T>::compare_segment_command(void const *const aa, void const *const bb)
{
Mach_segment_command const *const a = (Mach_segment_command const *)aa;
Mach_segment_command const *const b = (Mach_segment_command const *)bb;
unsigned const xa = a->cmd - Mach_segment_command::LC_SEGMENT;
unsigned const xb = b->cmd - Mach_segment_command::LC_SEGMENT;
if (xa < xb) return -1; // LC_SEGMENT first
if (xa > xb) return 1;
if (a->vmaddr < b->vmaddr) return -1; // ascending by .vmaddr
if (a->vmaddr > b->vmaddr) return 1;
return 0;
}
void PackMachPPC32::pack4(OutputFile *fo, Filter &ft) // append PackHeader
{
// offset of p_info in compressed file
overlay_offset = sizeof(mhdro) + sizeof(segcmdo) + sizeof(threado) + sizeof(linfo);
super::pack4(fo, ft);
segcmdo.filesize = fo->getBytesWritten();
segcmdo.vmsize += segcmdo.filesize;
fo->seek(sizeof(mhdro), SEEK_SET);
fo->rewrite(&segcmdo, sizeof(segcmdo));
fo->rewrite(&threado, sizeof(threado));
fo->rewrite(&linfo, sizeof(linfo));
}
void PackMachI386::pack4(OutputFile *fo, Filter &ft) // append PackHeader
{
// offset of p_info in compressed file
overlay_offset = sizeof(mhdro) + sizeof(segcmdo) + sizeof(threado) + sizeof(linfo);
super::pack4(fo, ft);
segcmdo.filesize = fo->getBytesWritten();
segcmdo.vmsize += segcmdo.filesize;
fo->seek(sizeof(mhdro), SEEK_SET);
fo->rewrite(&segcmdo, sizeof(segcmdo));
fo->rewrite(&threado, sizeof(threado));
fo->rewrite(&linfo, sizeof(linfo));
}
void PackMachARMEL::pack4(OutputFile *fo, Filter &ft) // append PackHeader
{
// offset of p_info in compressed file
overlay_offset = sizeof(mhdro) + sizeof(segcmdo) + sizeof(threado) + sizeof(linfo);
super::pack4(fo, ft);
segcmdo.filesize = fo->getBytesWritten();
segcmdo.vmsize += segcmdo.filesize;
fo->seek(sizeof(mhdro), SEEK_SET);
fo->rewrite(&segcmdo, sizeof(segcmdo));
fo->rewrite(&threado, sizeof(threado));
fo->rewrite(&linfo, sizeof(linfo));
}
#undef PAGE_MASK
#undef PAGE_SIZE
#define PAGE_MASK (~0u<<12)
#define PAGE_SIZE -PAGE_MASK
template <class T>
void PackMachBase<T>::pack4dylib( // append PackHeader
OutputFile *const fo,
Filter &ft,
Addr init_address
)
{
unsigned opos = sizeof(mhdro);
fo->seek(opos, SEEK_SET);
// Append each non-__TEXT segment, page aligned.
int slide = 0;
unsigned o_end_txt = 0;
unsigned hdrpos = sizeof(mhdro);
Mach_segment_command const *seg = rawmseg;
Mach_segment_command const *const endseg =
(Mach_segment_command const *)(mhdri.sizeofcmds + (char const *)seg);
for ( ; seg < endseg; seg = (Mach_segment_command const *)(
seg->cmdsize + (char const *)seg )
) switch (~Mach_segment_command::LC_REQ_DYLD & seg->cmd) {
default: // unknown if any file offset field must slide
printf("Unrecognized Macho cmd offset=0x%x cmd=0x%x size=0x%x\n", (char *)seg - (char *)rawmseg, (unsigned)seg->cmd, (unsigned)seg->cmdsize);
// fall through
case Mach_segment_command::LC_THREAD:
case Mach_segment_command::LC_UNIXTHREAD:
case Mach_segment_command::LC_LOAD_DYLIB:
case Mach_segment_command::LC_ID_DYLIB:
case Mach_segment_command::LC_LOAD_DYLINKER:
case Mach_segment_command::LC_UUID:
case Mach_segment_command::LC_RPATH:
case Mach_segment_command::LC_CODE_SIGNATURE:
case Mach_segment_command::LC_REEXPORT_DYLIB:
hdrpos += seg->cmdsize;
break; // contain no file offset fields
case Mach_segment_command::LC_TWOLEVEL_HINTS: {
Mach_twolevel_hints_command cmd = *(Mach_twolevel_hints_command const *)seg;
if (o_end_txt <= cmd.offset) { cmd.offset += slide; }
fo->seek(hdrpos, SEEK_SET);
fo->rewrite(&cmd, sizeof(cmd));
hdrpos += sizeof(cmd);
} break;
case Mach_segment_command::LC_ROUTINES_64:
case Mach_segment_command::LC_ROUTINES: {
Mach_routines_command cmd = *(Mach_routines_command const *)seg;
cmd.reserved1 = cmd.init_address;
cmd.init_address = init_address;
fo->seek(hdrpos, SEEK_SET);
fo->rewrite(&cmd, sizeof(cmd));
hdrpos += sizeof(cmd);
} break;
case Mach_segment_command::LC_SEGMENT_64:
case Mach_segment_command::LC_SEGMENT: {
// non-__TEXT might be observed and relocated by dyld before us.
Mach_segment_command segcmdtmp = *seg;
bool const is_text = 0==strncmp(&seg->segname[0], "__TEXT", 1+ 6);
{
if (is_text) {
slide = 0;
segcmdtmp.filesize = fo->getBytesWritten();
segcmdtmp.maxprot |= Mach_segment_command::VM_PROT_WRITE;
segcmdtmp.initprot |= Mach_segment_command::VM_PROT_WRITE;
opos = o_end_txt = segcmdtmp.filesize + segcmdtmp.fileoff;
}
else {
opos += ~PAGE_MASK & (0u - opos); // advance to PAGE_SIZE boundary
slide = opos - segcmdtmp.fileoff;
segcmdtmp.fileoff = opos;
}
fo->seek(hdrpos, SEEK_SET);
fo->rewrite(&segcmdtmp, sizeof(segcmdtmp));
hdrpos += sizeof(segcmdtmp);
// Update the sections.
Mach_section_command const *secp = (Mach_section_command const *)(1+ seg);
unsigned const nsects = segcmdtmp.nsects;
Mach_section_command seccmdtmp;
for (unsigned j = 0; j < nsects; ++secp, ++j) {
seccmdtmp = *secp;
seccmdtmp.offset += slide;
if (seccmdtmp.nreloc) {
seccmdtmp.reloff += slide;
}
fo->rewrite(&seccmdtmp, sizeof(seccmdtmp));
hdrpos += sizeof(seccmdtmp);
}
if (!is_text) {
fo->seek(opos, SEEK_SET);
fi->seek(seg->fileoff, SEEK_SET);
unsigned const len = seg->filesize;
char data[len];
fi->readx(data, len);
fo->write(data, len);
opos += len;
}
}
} break;
case Mach_segment_command::LC_SYMTAB: {
Mach_symtab_command cmd = *(Mach_symtab_command const *)seg;
if (o_end_txt <= cmd.symoff) { cmd.symoff += slide; }
if (o_end_txt <= cmd.stroff) { cmd.stroff += slide; }
fo->seek(hdrpos, SEEK_SET);
fo->rewrite(&cmd, sizeof(cmd));
hdrpos += sizeof(cmd);
} break;
case Mach_segment_command::LC_DYSYMTAB: {
Mach_dysymtab_command cmd = *(Mach_dysymtab_command const *)seg;
if (o_end_txt <= cmd.tocoff) { cmd.tocoff += slide; }
if (o_end_txt <= cmd.modtaboff) { cmd.modtaboff += slide; }
if (o_end_txt <= cmd.extrefsymoff) { cmd.extrefsymoff += slide; }
if (o_end_txt <= cmd.indirectsymoff) { cmd.indirectsymoff += slide; }
if (o_end_txt <= cmd.extreloff) { cmd.extreloff += slide; }
if (o_end_txt <= cmd.locreloff) { cmd.locreloff += slide; }
fo->seek(hdrpos, SEEK_SET);
fo->rewrite(&cmd, sizeof(cmd));
hdrpos += sizeof(cmd);
} break;
case Mach_segment_command::LC_SEGMENT_SPLIT_INFO: {
Mach_segsplit_info_command cmd = *(Mach_segsplit_info_command const *)seg;
if (o_end_txt <= cmd.dataoff) { cmd.dataoff += slide; }
fo->seek(hdrpos, SEEK_SET);
fo->rewrite(&cmd, sizeof(cmd));
hdrpos += sizeof(cmd);
} break;
} // end 'switch'
fo->seek(opos, SEEK_SET); // BUG: "fo->seek(0, SEEK_END);" is broken
// offset of p_info in compressed file
overlay_offset = sizeof(mhdro) + mhdro.sizeofcmds + sizeof(linfo);
PackMachBase<T>::pack4(fo, ft);
}
void PackDylibI386::pack4(OutputFile *fo, Filter &ft) // append PackHeader
{
pack4dylib(fo, ft, threado.state.eip);
}
void PackDylibPPC32::pack4(OutputFile *fo, Filter &ft) // append PackHeader
{
pack4dylib(fo, ft, threado.state.srr0);
}
void PackMachPPC32::pack3(OutputFile *fo, Filter &ft) // append loader
{
TE32 disp;
unsigned const zero = 0;
unsigned len = fo->getBytesWritten();
fo->write(&zero, 3& (0u-len));
len += (3& (0u-len)) + sizeof(disp);
disp = 4+ len - sz_mach_headers; // 4: sizeof(instruction)
fo->write(&disp, sizeof(disp));
threado.state.srr0 = len + segcmdo.vmaddr; /* entry address */
super::pack3(fo, ft);
}
void PackMachI386::pack3(OutputFile *fo, Filter &ft) // append loader
{
TE32 disp;
unsigned const zero = 0;
unsigned len = fo->getBytesWritten();
fo->write(&zero, 3& (0u-len));
len += (3& (0u-len));
disp = len - sz_mach_headers;
fo->write(&disp, sizeof(disp));
threado.state.eip = len + sizeof(disp) + segcmdo.vmaddr; /* entry address */
super::pack3(fo, ft);
}
void PackMachARMEL::pack3(OutputFile *fo, Filter &ft) // append loader
{
TE32 disp;
unsigned const zero = 0;
unsigned len = fo->getBytesWritten();
fo->write(&zero, 3& (0u-len));
len += (3& (0u-len));
disp = len - sz_mach_headers;
fo->write(&disp, sizeof(disp));
threado.state.pc = len + sizeof(disp) + segcmdo.vmaddr; /* entry address */
super::pack3(fo, ft);
}
void PackDylibI386::pack3(OutputFile *fo, Filter &ft) // append loader
{
TE32 disp;
unsigned const zero = 0;
unsigned len = fo->getBytesWritten();
fo->write(&zero, 3& (0u-len));
len += (3& (0u-len)) + 4*sizeof(disp);
disp = prev_init_address;
fo->write(&disp, sizeof(disp)); // user .init_address
disp = sizeof(mhdro) + mhdro.sizeofcmds + sizeof(l_info) + sizeof(p_info);
fo->write(&disp, sizeof(disp)); // src offset(compressed __TEXT)
disp = len - disp - 3*sizeof(disp);
fo->write(&disp, sizeof(disp)); // length(compressed __TEXT)
unsigned const save_sz_mach_headers(sz_mach_headers);
sz_mach_headers = 0;
super::pack3(fo, ft);
sz_mach_headers = save_sz_mach_headers;
}
void PackDylibPPC32::pack3(OutputFile *fo, Filter &ft) // append loader
{
TE32 disp;
unsigned const zero = 0;
unsigned len = fo->getBytesWritten();
fo->write(&zero, 3& (0u-len));
len += (3& (0u-len)) + 4*sizeof(disp);
disp = prev_init_address;
fo->write(&disp, sizeof(disp)); // user .init_address
disp = sizeof(mhdro) + mhdro.sizeofcmds + sizeof(l_info) + sizeof(p_info);
fo->write(&disp, sizeof(disp)); // src offset(compressed __TEXT)
disp = len - disp - 3*sizeof(disp);
fo->write(&disp, sizeof(disp)); // length(compressed __TEXT)
unsigned const save_sz_mach_headers(sz_mach_headers);
sz_mach_headers = 0;
super::pack3(fo, ft);
sz_mach_headers = save_sz_mach_headers;
}
// Determine length of gap between PT_LOAD phdri[k] and closest PT_LOAD
// which follows in the file (or end-of-file). Optimize for common case
// where the PT_LOAD are adjacent ascending by .p_offset. Assume no overlap.
template <class T>
unsigned PackMachBase<T>::find_SEGMENT_gap(
unsigned const k
)
{
if (Mach_segment_command::LC_SEGMENT!=msegcmd[k].cmd
|| 0==msegcmd[k].filesize ) {
return 0;
}
unsigned const hi = msegcmd[k].fileoff + msegcmd[k].filesize;
unsigned lo = ph.u_file_size;
unsigned j = k;
for (;;) { // circular search, optimize for adjacent ascending
++j;
if (n_segment==j) {
j = 0;
}
if (k==j) {
break;
}
if (Mach_segment_command::LC_SEGMENT==msegcmd[j].cmd
&& 0!=msegcmd[j].filesize ) {
unsigned const t = msegcmd[j].fileoff;
if ((t - hi) < (lo - hi)) {
lo = t;
if (hi==lo) {
break;
}
}
}
}
return lo - hi;
}
template <class T>
void PackMachBase<T>::pack4(OutputFile *fo, Filter &ft)
{
PackUnix::pack4(fo, ft); // FIXME super() does not work?
}
template <class T>
void PackMachBase<T>::pack3(OutputFile *fo, Filter &ft)
{
PackUnix::pack3(fo, ft); // FIXME super() does not work?
}
template <class T>
void PackMachBase<T>::pack2(OutputFile *fo, Filter &ft) // append compressed body
{
Extent x;
unsigned k;
// count passes, set ptload vars
uip->ui_total_passes = 0;
for (k = 0; k < n_segment; ++k) {
if (Mach_segment_command::LC_SEGMENT==msegcmd[k].cmd
&& 0!=msegcmd[k].filesize ) {
uip->ui_total_passes++;
if (my_filetype==Mach_header::MH_DYLIB) {
break;
}
if (find_SEGMENT_gap(k)) {
uip->ui_total_passes++;
}
}
}
// compress extents
unsigned total_in = 0;
unsigned total_out = 0;
unsigned hdr_u_len = mhdri.sizeofcmds + sizeof(mhdri);
uip->ui_pass = 0;
ft.addvalue = 0;
// Packer::compressWithFilters chooses a filter for us, and the stubs
// can handle only one filter, and most filters are for executable
// instructions. So filter only the largest executable segment.
unsigned exe_filesize_max = 0;
for (k = 0; k < n_segment; ++k)
if (Mach_segment_command::LC_SEGMENT==msegcmd[k].cmd
&& 0!=(Mach_segment_command::VM_PROT_EXECUTE & msegcmd[k].initprot)
&& exe_filesize_max < msegcmd[k].filesize) {
exe_filesize_max = msegcmd[k].filesize;
}
int nx = 0;
for (k = 0; k < n_segment; ++k)
if (Mach_segment_command::LC_SEGMENT==msegcmd[k].cmd
&& 0!=msegcmd[k].filesize ) {
x.offset = msegcmd[k].fileoff;
x.size = msegcmd[k].filesize;
if (0 == nx) { // 1st LC_SEGMENT must cover Mach_header at 0==fileoffset
unsigned const delta = mhdri.sizeofcmds + sizeof(mhdri);
x.offset += delta;
x.size -= delta;
}
bool const do_filter = (msegcmd[k].filesize==exe_filesize_max)
&& 0!=(Mach_segment_command::VM_PROT_EXECUTE & msegcmd[k].initprot);
packExtent(x, total_in, total_out,
(do_filter ? &ft : 0 ), fo, hdr_u_len );
if (do_filter) {
exe_filesize_max = 0;
}
hdr_u_len = 0;
++nx;
if (my_filetype==Mach_header::MH_DYLIB) {
break;
}
}
if (my_filetype!=Mach_header::MH_DYLIB)
for (k = 0; k < n_segment; ++k) {
x.size = find_SEGMENT_gap(k);
if (x.size) {
x.offset = msegcmd[k].fileoff +msegcmd[k].filesize;
packExtent(x, total_in, total_out, 0, fo);
}
}
if (my_filetype!=Mach_header::MH_DYLIB)
if ((off_t)total_in != file_size)
throwEOFException();
segcmdo.filesize = fo->getBytesWritten();
}
void PackMachPPC32::pack1_setup_threado(OutputFile *const fo)
{
threado.cmd = Mach_segment_command::LC_UNIXTHREAD;
threado.cmdsize = sizeof(threado);
threado.flavor = my_thread_flavor;
threado.count = my_thread_state_word_count;
memset(&threado.state, 0, sizeof(threado.state));
fo->write(&threado, sizeof(threado));
}
void PackMachI386::pack1_setup_threado(OutputFile *const fo)
{
threado.cmd = Mach_segment_command::LC_UNIXTHREAD;
threado.cmdsize = sizeof(threado);
threado.flavor = my_thread_flavor;
threado.count = my_thread_state_word_count;
memset(&threado.state, 0, sizeof(threado.state));
fo->write(&threado, sizeof(threado));
}
void PackMachARMEL::pack1_setup_threado(OutputFile *const fo)
{
threado.cmd = Mach_segment_command::LC_UNIXTHREAD;
threado.cmdsize = sizeof(threado);
threado.flavor = my_thread_flavor;
threado.count = my_thread_state_word_count;
memset(&threado.state, 0, sizeof(threado.state));
fo->write(&threado, sizeof(threado));
}
template <class T>
void PackMachBase<T>::pack1(OutputFile *const fo, Filter &/*ft*/) // generate executable header
{
mhdro = mhdri;
if (my_filetype==Mach_header::MH_EXECUTE) {
mhdro.ncmds = 2;
mhdro.sizeofcmds = sizeof(segcmdo) + my_thread_command_size;
mhdro.flags = Mach_header::MH_NOUNDEFS;
}
fo->write(&mhdro, sizeof(mhdro));
segcmdo.cmd = Mach_segment_command::LC_SEGMENT;
segcmdo.cmdsize = sizeof(segcmdo);
strncpy((char *)segcmdo.segname, "__TEXT", sizeof(segcmdo.segname));
if (my_filetype==Mach_header::MH_EXECUTE) {
segcmdo.vmaddr = PAGE_MASK & (~PAGE_MASK +
msegcmd[n_segment -1].vmsize + msegcmd[n_segment -1].vmaddr );
}
if (my_filetype==Mach_header::MH_DYLIB) {
segcmdo.vmaddr = 0;
}
segcmdo.vmsize = 0; // adjust later
segcmdo.fileoff = 0;
segcmdo.filesize = 0; // adjust later
segcmdo.initprot = segcmdo.maxprot =
Mach_segment_command::VM_PROT_READ |
Mach_segment_command::VM_PROT_WRITE |
Mach_segment_command::VM_PROT_EXECUTE;
segcmdo.nsects = 0;
segcmdo.flags = 0;
if (my_filetype==Mach_header::MH_EXECUTE) {
fo->write(&segcmdo, sizeof(segcmdo));
pack1_setup_threado(fo);
}
if (my_filetype==Mach_header::MH_DYLIB) {
fo->write(rawmseg, mhdri.sizeofcmds);
}
sz_mach_headers = fo->getBytesWritten();
memset((char *)&linfo, 0, sizeof(linfo));
fo->write(&linfo, sizeof(linfo));
return;
}
template <class T>
void PackMachBase<T>::unpack(OutputFile *fo)
{
fi->seek(0, SEEK_SET);
fi->readx(&mhdri, sizeof(mhdri));
rawmseg = (Mach_segment_command *)new char[(unsigned) mhdri.sizeofcmds];
fi->readx(rawmseg, mhdri.sizeofcmds);
overlay_offset = sizeof(mhdri) + mhdri.sizeofcmds + sizeof(linfo);
fi->seek(overlay_offset, SEEK_SET);
p_info hbuf;
fi->readx(&hbuf, sizeof(hbuf));
unsigned orig_file_size = get_te32(&hbuf.p_filesize);
blocksize = get_te32(&hbuf.p_blocksize);
if (file_size > (off_t)orig_file_size || blocksize > orig_file_size)
throwCantUnpack("file header corrupted");
ibuf.alloc(blocksize + OVERHEAD);
b_info bhdr; memset(&bhdr, 0, sizeof(bhdr));
fi->readx(&bhdr, sizeof(bhdr));
ph.u_len = get_te32(&bhdr.sz_unc);
ph.c_len = get_te32(&bhdr.sz_cpr);
ph.method = bhdr.b_method;
ph.filter = bhdr.b_ftid;
ph.filter_cto = bhdr.b_cto8;
// Uncompress Macho headers
fi->readx(ibuf, ph.c_len);
Mach_header *const mhdr = (Mach_header *)new upx_byte[ph.u_len];
decompress(ibuf, (upx_byte *)mhdr, false);
unsigned const ncmds = mhdr->ncmds;
msegcmd = new Mach_segment_command[ncmds];
unsigned char *ptr = (unsigned char *)(1+mhdr);
for (unsigned j= 0; j < ncmds; ++j) {
msegcmd[j] = *(Mach_segment_command *)ptr;
ptr += (unsigned) ((Mach_segment_command *)ptr)->cmdsize;
}
// Put LC_SEGMENT together at the beginning, ascending by .vmaddr.
qsort(msegcmd, ncmds, sizeof(*msegcmd), compare_segment_command);
n_segment = 0;
for (unsigned j= 0; j < ncmds; ++j) {
n_segment += (Mach_segment_command::LC_SEGMENT==msegcmd[j].cmd);
}
unsigned total_in = 0;
unsigned total_out = 0;
unsigned c_adler = upx_adler32(NULL, 0);
unsigned u_adler = upx_adler32(NULL, 0);
Mach_segment_command const *sc = (Mach_segment_command const *)(void *)(1+ mhdr);
unsigned k;
fi->seek(- (off_t)(sizeof(bhdr) + ph.c_len), SEEK_CUR);
for (
k = 0;
k < ncmds;
(++k), (sc = (Mach_segment_command const *)(sc->cmdsize + (char const *)sc))
) {
if (Mach_segment_command::LC_SEGMENT==sc->cmd
&& 0!=sc->filesize ) {
unsigned filesize = sc->filesize;
unpackExtent(filesize, fo, total_in, total_out,
c_adler, u_adler, false, sizeof(bhdr));
if (my_filetype==Mach_header::MH_DYLIB) {
break;
}
}
}
if (my_filetype==Mach_header::MH_DYLIB) {
Mach_segment_command const *rc = rawmseg;
rc = (Mach_segment_command const *)(rc->cmdsize + (char const *)rc);
sc = (Mach_segment_command const *)(sc->cmdsize + (char const *)sc);
for (
k=1;
k < ncmds;
(++k), (sc = (Mach_segment_command const *)(sc->cmdsize + (char const *)sc)),
(rc = (Mach_segment_command const *)(rc->cmdsize + (char const *)rc))
) {
if (Mach_segment_command::LC_SEGMENT==rc->cmd
&& 0!=rc->filesize ) {
fi->seek(rc->fileoff, SEEK_SET);
fo->seek(sc->fileoff, SEEK_SET);
unsigned const len = rc->filesize;
char data[len];
fi->readx(data, len);
fo->write(data, len);
}
}
}
else
for (unsigned j = 0; j < ncmds; ++j) {
unsigned const size = find_SEGMENT_gap(j);
if (size) {
unsigned const where = msegcmd[k].fileoff +msegcmd[k].filesize;
if (fo)
fo->seek(where, SEEK_SET);
unpackExtent(size, fo, total_in, total_out,
c_adler, u_adler, false, sizeof(bhdr));
}
}
delete mhdr;
}
template <class T>
bool PackMachBase<T>::canPack()
{
fi->seek(0, SEEK_SET);
fi->readx(&mhdri, sizeof(mhdri));
if (Mach_header::MH_MAGIC !=mhdri.magic
|| my_cputype !=mhdri.cputype
|| my_filetype !=mhdri.filetype
)
return false;
rawmseg = (Mach_segment_command *)new char[(unsigned) mhdri.sizeofcmds];
fi->readx(rawmseg, mhdri.sizeofcmds);
msegcmd = new Mach_segment_command[(unsigned) mhdri.ncmds];
unsigned char const *ptr = (unsigned char const *)rawmseg;
for (unsigned j= 0; j < mhdri.ncmds; ++j) {
msegcmd[j] = *(Mach_segment_command const *)ptr;
if (((Mach_segment_command const *)ptr)->cmd ==
Mach_segment_command::LC_ROUTINES) {
o_routines_cmd = (char *)ptr - (char *)rawmseg;
prev_init_address = ((Mach_routines_command const *)ptr)->init_address;
}
ptr += (unsigned) ((Mach_segment_command *)ptr)->cmdsize;
}
if (Mach_header::MH_DYLIB==my_filetype && 0==o_routines_cmd) {
return false;
}
// Put LC_SEGMENT together at the beginning, ascending by .vmaddr.
qsort(msegcmd, mhdri.ncmds, sizeof(*msegcmd), compare_segment_command);
// Check that LC_SEGMENTs form one contiguous chunk of the file.
for (unsigned j= 0; j < mhdri.ncmds; ++j) {
if (Mach_segment_command::LC_SEGMENT==msegcmd[j].cmd) {
if (~PAGE_MASK & (msegcmd[j].fileoff | msegcmd[j].vmaddr)) {
return false;
}
if (0 < j) {
unsigned const sz = PAGE_MASK
& (~PAGE_MASK + msegcmd[j-1].filesize);
if ((sz + msegcmd[j-1].fileoff)!=msegcmd[j].fileoff) {
return false;
}
}
++n_segment;
sz_segment = msegcmd[j].filesize + msegcmd[j].fileoff - msegcmd[0].fileoff;
}
}
// info: currently the header is 36 (32+4) bytes before EOF
unsigned char buf[256];
fi->seek(-(off_t)sizeof(buf), SEEK_END);
fi->readx(buf, sizeof(buf));
checkAlreadyPacked(buf, sizeof(buf));
// set options
opt->o_unix.blocksize = file_size;
return 0 < n_segment;
}
template class PackMachBase<MachClass_BE32>;
template class PackMachBase<MachClass_LE32>;
PackMachFat::PackMachFat(InputFile *f) : super(f)
{
bele = &N_BELE_RTP::le_policy; // sham
}
PackMachFat::~PackMachFat()
{
}
const int *PackMachFat::getCompressionMethods(int /*method*/, int /*level*/) const
{
static const int m_nrv2e[] = { M_NRV2E_LE32, M_END };
return m_nrv2e; // sham
}
const int *PackMachFat::getFilters() const
{
static const int filters[] = { 0x49, FT_END };
return filters; // sham
}
void PackMachFat::pack(OutputFile *fo)
{
unsigned const in_size = this->file_size;
fo->write(&fat_head, sizeof(fat_head.fat) +
fat_head.fat.nfat_arch * sizeof(fat_head.arch[0]));
unsigned length = 0;
for (unsigned j=0; j < fat_head.fat.nfat_arch; ++j) {
unsigned base = fo->unset_extent(); // actual length
base += ~(~0u<<fat_head.arch[j].align) & (0-base); // align up
fo->seek(base, SEEK_SET);
fo->set_extent(base, ~0u);
ph.u_file_size = fat_head.arch[j].size;
fi->set_extent(fat_head.arch[j].offset, fat_head.arch[j].size);
switch (fat_head.arch[j].cputype) {
case PackMachFat::CPU_TYPE_I386: {
PackMachI386 packer(fi);
packer.initPackHeader();
packer.canPack();
packer.updatePackHeader();
packer.pack(fo);
} break;
case PackMachFat::CPU_TYPE_POWERPC: {
PackMachPPC32 packer(fi);
packer.initPackHeader();
packer.canPack();
packer.updatePackHeader();
packer.pack(fo);
} break;
} // switch cputype
fat_head.arch[j].offset = base;
length = fo->unset_extent();
fat_head.arch[j].size = length - base;
}
ph.u_file_size = in_size;
fi->set_extent(0, in_size);
fo->seek(0, SEEK_SET);
fo->rewrite(&fat_head, sizeof(fat_head.fat) +
fat_head.fat.nfat_arch * sizeof(fat_head.arch[0]));
fo->set_extent(0, length);
}
void PackMachFat::unpack(OutputFile *fo)
{
fo->seek(0, SEEK_SET);
fo->write(&fat_head, sizeof(fat_head.fat) +
fat_head.fat.nfat_arch * sizeof(fat_head.arch[0]));
unsigned length;
for (unsigned j=0; j < fat_head.fat.nfat_arch; ++j) {
unsigned base = fo->unset_extent(); // actual length
base += ~(~0u<<fat_head.arch[j].align) & (0-base); // align up
fo->seek(base, SEEK_SET);
fo->set_extent(base, ~0u);
ph.u_file_size = fat_head.arch[j].size;
fi->set_extent(fat_head.arch[j].offset, fat_head.arch[j].size);
switch (fat_head.arch[j].cputype) {
case PackMachFat::CPU_TYPE_I386: {
PackMachI386 packer(fi);
packer.initPackHeader();
packer.canUnpack();
packer.unpack(fo);
} break;
case PackMachFat::CPU_TYPE_POWERPC: {
PackMachPPC32 packer(fi);
packer.initPackHeader();
packer.canUnpack();
packer.unpack(fo);
} break;
} // switch cputype
fat_head.arch[j].offset = base;
length = fo->unset_extent();
fat_head.arch[j].size = length - base;
}
fo->unset_extent();
fo->seek(0, SEEK_SET);
fo->rewrite(&fat_head, sizeof(fat_head.fat) +
fat_head.fat.nfat_arch * sizeof(fat_head.arch[0]));
}
bool PackMachFat::canPack()
{
struct Mach_fat_arch *arch = &fat_head.arch[0];
fi->readx(&fat_head, sizeof(fat_head));
if (Mach_fat_header::FAT_MAGIC!=fat_head.fat.magic
|| N_FAT_ARCH < fat_head.fat.nfat_arch) {
return false;
}
for (unsigned j=0; j < fat_head.fat.nfat_arch; ++j) {
fi->set_extent(fat_head.arch[j].offset, fat_head.arch[j].size);
switch (arch[j].cputype) {
default: return false;
case PackMachFat::CPU_TYPE_I386: {
PackMachI386 packer(fi);
if (!packer.canPack())
return false;
} break;
case PackMachFat::CPU_TYPE_POWERPC: {
PackMachPPC32 packer(fi);
if (!packer.canPack())
return false;
} break;
} // switch cputype
}
// info: currently the header is 36 (32+4) bytes before EOF
unsigned char buf[256];
fi->seek(-(off_t)sizeof(buf), SEEK_END);
fi->readx(buf, sizeof(buf));
checkAlreadyPacked(buf, sizeof(buf));
return true;
}
int PackMachFat::canUnpack()
{
struct Mach_fat_arch *arch = &fat_head.arch[0];
fi->readx(&fat_head, sizeof(fat_head));
if (Mach_fat_header::FAT_MAGIC!=fat_head.fat.magic
|| N_FAT_ARCH < fat_head.fat.nfat_arch) {
return false;
}
for (unsigned j=0; j < fat_head.fat.nfat_arch; ++j) {
fi->set_extent(fat_head.arch[j].offset, fat_head.arch[j].size);
switch (arch[j].cputype) {
default: return false;
case PackMachFat::CPU_TYPE_I386: {
PackMachI386 packer(fi);
if (!packer.canUnpack())
return 0;
ph.format = packer.getFormat(); // FIXME: copy entire PackHeader
} break;
case PackMachFat::CPU_TYPE_POWERPC: {
PackMachPPC32 packer(fi);
if (!packer.canUnpack())
return 0;
ph.format = packer.getFormat(); // FIXME: copy entire PackHeader
} break;
} // switch cputype
}
return 1;
}
void PackMachFat::buildLoader(const Filter */*ft*/)
{
assert(false);
}
Linker* PackMachFat::newLinker() const
{
return new ElfLinkerX86; // sham
}
void PackMachFat::list()
{
assert(false);
}
/*
vi:ts=4:et
*/
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