add missing source file
This commit is contained in:
John Reiser
parent
b60caeb9dd
commit
1dcd7a16ab
462
src/stub/src/arm-darwin.macho-main.c
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462
src/stub/src/arm-darwin.macho-main.c
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@ -0,0 +1,462 @@
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/* arm-darwin.macho-main.c -- loader stub for Mach-o ARMEL
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This file is part of the UPX executable compressor.
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Copyright (C) 1996-2008 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 1996-2008 Laszlo Molnar
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Copyright (C) 2000-2008 John F. Reiser
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All Rights Reserved.
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UPX and the UCL library are free software; you can redistribute them
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and/or modify them under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Markus F.X.J. Oberhumer Laszlo Molnar
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<markus@oberhumer.com> <ml1050@users.sourceforge.net>
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John F. Reiser
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<jreiser@users.sourceforge.net>
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*/
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//#define SIMULATE_ON_DEBIAN_EABI4 1
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#undef SIMULATE_ON_DEBIAN_EABI4
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#include "include/darwin.h"
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/*************************************************************************
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// configuration section
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**************************************************************************/
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// In order to make it much easier to move this code at runtime and execute
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// it at an address different from it load address: there must be no
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// static data, and no string constants.
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/*************************************************************************
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// "file" util
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**************************************************************************/
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typedef struct {
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size_t size; // must be first to match size[0] uncompressed size
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void *buf;
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} Extent;
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static void
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xread(Extent *x, void *buf, size_t count)
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{
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unsigned char *p=x->buf, *q=buf;
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size_t j;
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if (x->size < count) {
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exit(127);
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}
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for (j = count; 0!=j--; ++p, ++q) {
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*q = *p;
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}
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x->buf += count;
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x->size -= count;
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}
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/*************************************************************************
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// util
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**************************************************************************/
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#if 1 //{ save space
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#define ERR_LAB error: exit(127);
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#define err_exit(a) goto error
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#else //}{ save debugging time
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#define ERR_LAB
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static void
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err_exit(int a)
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{
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(void)a; // debugging convenience
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exit(127);
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}
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#endif //}
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/*************************************************************************
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// UPX & NRV stuff
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**************************************************************************/
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struct l_info { // 12-byte trailer for loader (after macho headers)
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unsigned l_checksum;
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unsigned l_magic; // UPX_MAGIC_LE32
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unsigned short l_lsize;
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unsigned char l_version;
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unsigned char l_format;
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};
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struct p_info { // 12-byte packed program header
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unsigned p_progid;
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unsigned p_filesize;
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unsigned p_blocksize;
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};
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struct b_info { // 12-byte header before each compressed block
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unsigned sz_unc; // uncompressed_size
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unsigned sz_cpr; // compressed_size
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unsigned char b_method; // compression algorithm
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unsigned char b_ftid; // filter id
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unsigned char b_cto8; // filter parameter
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unsigned char b_unused;
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};
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typedef void f_unfilter(
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nrv_byte *, // also addvalue
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nrv_uint,
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unsigned cto8, // junk in high 24 bits
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unsigned ftid
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);
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typedef int f_expand(
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const nrv_byte *, nrv_uint,
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nrv_byte *, nrv_uint *, unsigned );
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static void
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unpackExtent(
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Extent *const xi, // input
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Extent *const xo, // output
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f_expand *const f_decompress,
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f_unfilter *f_unf
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)
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{
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while (xo->size) {
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struct b_info h;
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// Note: if h.sz_unc == h.sz_cpr then the block was not
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// compressible and is stored in its uncompressed form.
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// Read and check block sizes.
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xread(xi, (unsigned char *)&h, sizeof(h));
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if (h.sz_unc == 0) { // uncompressed size 0 -> EOF
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if (h.sz_cpr != UPX_MAGIC_LE32) // h.sz_cpr must be h->magic
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err_exit(2);
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if (xi->size != 0) // all bytes must be written
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err_exit(3);
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break;
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}
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if (h.sz_cpr <= 0) {
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err_exit(4);
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ERR_LAB
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}
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if (h.sz_cpr > h.sz_unc
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|| h.sz_unc > xo->size ) {
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err_exit(5);
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}
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// Now we have:
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// assert(h.sz_cpr <= h.sz_unc);
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// assert(h.sz_unc > 0 && h.sz_unc <= blocksize);
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// assert(h.sz_cpr > 0 && h.sz_cpr <= blocksize);
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if (h.sz_cpr < h.sz_unc) { // Decompress block
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nrv_uint out_len = h.sz_unc; // EOF for lzma
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int const j = (*f_decompress)(xi->buf, h.sz_cpr,
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xo->buf, &out_len, h.b_method);
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if (j != 0 || out_len != (nrv_uint)h.sz_unc)
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err_exit(7);
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if (h.b_ftid!=0 && f_unf) { // have filter
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(*f_unf)(xo->buf, out_len, h.b_cto8, h.b_ftid);
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}
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xi->buf += h.sz_cpr;
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xi->size -= h.sz_cpr;
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}
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else { // copy literal block
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xread(xi, xo->buf, h.sz_cpr);
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}
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xo->buf += h.sz_unc;
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xo->size -= h.sz_unc;
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}
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}
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static void
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upx_bzero(unsigned char *p, size_t len)
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{
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if (len) do {
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*p++= 0;
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} while (--len);
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}
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#define bzero upx_bzero
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// The PF_* and PROT_* bits are {1,2,4}; the conversion table fits in 32 bits.
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#define REP8(x) \
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((x)|((x)<<4)|((x)<<8)|((x)<<12)|((x)<<16)|((x)<<20)|((x)<<24)|((x)<<28))
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#define EXP8(y) \
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((1&(y)) ? 0xf0f0f0f0 : (2&(y)) ? 0xff00ff00 : (4&(y)) ? 0xffff0000 : 0)
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#define PF_TO_PROT(pf) \
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((PROT_READ|PROT_WRITE|PROT_EXEC) & ( \
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( (REP8(PROT_EXEC ) & EXP8(PF_X)) \
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|(REP8(PROT_READ ) & EXP8(PF_R)) \
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|(REP8(PROT_WRITE) & EXP8(PF_W)) \
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) >> ((pf & (PF_R|PF_W|PF_X))<<2) ))
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typedef struct {
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unsigned magic;
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unsigned nfat_arch;
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} Fat_header;
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typedef struct {
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unsigned cputype;
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unsigned cpusubtype;
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unsigned offset;
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unsigned size;
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unsigned align; /* shift count (log base 2) */
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} Fat_arch;
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enum e8 {
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FAT_MAGIC = 0xcafebabe
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};
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enum e9 {
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CPU_TYPE_I386 = 7,
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CPU_TYPE_ARM = 12,
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CPU_TYPE_POWERPC = 0x00000012,
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CPU_TYPE_POWERPC64 = 0x01000012
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};
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typedef struct {
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unsigned magic;
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unsigned cputype;
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unsigned cpysubtype;
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unsigned filetype;
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unsigned ncmds;
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unsigned sizeofcmds;
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unsigned flags;
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} Mach_header;
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enum e0 {
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MH_MAGIC = 0xfeedface
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};
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enum e2 {
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MH_EXECUTE = 2
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};
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enum e3 {
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MH_NOUNDEFS = 1
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};
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typedef struct {
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unsigned cmd;
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unsigned cmdsize;
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} Mach_load_command;
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enum e4 {
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LC_SEGMENT = 0x1,
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LC_THREAD = 0x4,
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LC_UNIXTHREAD = 0x5,
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LC_LOAD_DYLINKER = 0xe
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};
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typedef struct {
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unsigned cmd;
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unsigned cmdsize;
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char segname[16];
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unsigned vmaddr;
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unsigned vmsize;
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unsigned fileoff;
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unsigned filesize;
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unsigned maxprot;
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unsigned initprot;
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unsigned nsects;
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unsigned flags;
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} Mach_segment_command;
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enum e5 {
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VM_PROT_READ = 1,
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VM_PROT_WRITE = 2,
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VM_PROT_EXECUTE = 4
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};
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typedef struct {
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unsigned r[13]; // r0-r12
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unsigned sp; // r13
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unsigned lr; // r14
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unsigned pc; // r15
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unsigned cpsr;
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} Mach_ARM_thread_state;
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typedef struct {
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unsigned cmd; /* LC_THREAD or LC_UNIXTHREAD */
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unsigned cmdsize; /* total size of this command */
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unsigned flavor;
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unsigned count; /* sizeof(following_thread_state)/4 */
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Mach_ARM_thread_state state;
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} Mach_thread_command;
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enum e6 {
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ARM_THREAD_STATE = 1
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};
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enum e7 {
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ARM_THREAD_STATE_COUNT = sizeof(Mach_ARM_thread_state)/4
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};
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typedef union {
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unsigned long offset; /* from start of load command to string */
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char *ptr;
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} Mach_lc_str;
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#define MAP_FIXED 0x10
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#define MAP_PRIVATE 0x02
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//#define MAP_ANON 0x1000
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#define MAP_ANON 0x20 // x86 DEBUG ONLY
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#define PROT_READ 1
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#define PROT_WRITE 2
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#define PROT_EXEC 4
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#define MAP_ANON_FD -1
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extern void *mmap(void *, size_t, unsigned, unsigned, int, off_t);
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ssize_t pread(int, void *, size_t, off_t);
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extern void bswap(void *, unsigned);
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static Mach_ARM_thread_state const *
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do_xmap(
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Mach_header const *const mhdr,
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off_t const fat_offset,
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Extent *const xi,
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int const fdi,
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Mach_header **mhdrpp,
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f_expand *const f_decompress,
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f_unfilter *const f_unf
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)
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{
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Mach_segment_command const *sc = (Mach_segment_command const *)(1+ mhdr);
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Mach_ARM_thread_state const *entry = 0;
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unsigned j;
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for ( j=0; j < mhdr->ncmds; ++j,
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(sc = (Mach_segment_command const *)(sc->cmdsize + (void const *)sc))
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) if (LC_SEGMENT==sc->cmd) {
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Extent xo;
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size_t mlen = xo.size = sc->filesize;
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unsigned char *addr = xo.buf = (unsigned char *)sc->vmaddr;
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unsigned char *haddr = sc->vmsize + addr;
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size_t frag = (int)addr &~ PAGE_MASK;
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addr -= frag;
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mlen += frag;
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if (0!=mlen && addr != mmap(addr, mlen, VM_PROT_READ | VM_PROT_WRITE,
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MAP_FIXED | MAP_PRIVATE |
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((xi || 0==sc->filesize) ? MAP_ANON : 0),
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((0==sc->filesize) ? MAP_ANON_FD : fdi), sc->fileoff + fat_offset) ) {
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err_exit(8);
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}
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if (xi && 0!=sc->filesize) {
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if (0==sc->fileoff /*&& 0!=mhdrpp*/) {
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*mhdrpp = (Mach_header *)(void *)addr;
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}
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unpackExtent(xi, &xo, f_decompress, f_unf);
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}
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/*bzero(addr, frag);*/ // fragment at lo end
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frag = (-mlen) &~ PAGE_MASK; // distance to next page boundary
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bzero(mlen+addr, frag); // fragment at hi end
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if (0!=mlen && 0!=mprotect(addr, mlen, sc->initprot)) {
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err_exit(10);
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ERR_LAB
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}
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addr += mlen + frag; /* page boundary on hi end */
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if (
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#if defined(SIMULATE_ON_DEBIAN_EABI4) /*{*/
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0!=addr &&
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#endif /*}*/
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addr < haddr) { // need pages for .bss
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if (addr != mmap(addr, haddr - addr, sc->initprot,
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MAP_FIXED | MAP_PRIVATE | MAP_ANON, MAP_ANON_FD, 0 ) ) {
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err_exit(9);
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}
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}
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}
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else if (LC_UNIXTHREAD==sc->cmd || LC_THREAD==sc->cmd) {
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Mach_thread_command const *const thrc = (Mach_thread_command const *)sc;
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if (ARM_THREAD_STATE ==thrc->flavor
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&& ARM_THREAD_STATE_COUNT==thrc->count ) {
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entry = &thrc->state;
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}
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}
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return entry;
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}
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extern void spin(void *, ...);
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/*************************************************************************
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// upx_main - called by our entry code
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//
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**************************************************************************/
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Mach_ARM_thread_state const *
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upx_main(
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struct l_info const *const li,
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size_t volatile sz_compressed, // total length
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Mach_header *const mhdr, // temp char[sz_mhdr] for decompressing
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size_t const sz_mhdr,
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f_expand *const f_decompress,
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f_unfilter *const f_unf,
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Mach_header **const mhdrpp // Out: *mhdrpp= &real Mach_header
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)
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{
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Mach_ARM_thread_state const *entry;
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off_t fat_offset = 0;
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Extent xi, xo, xi0;
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xi.buf = CONST_CAST(unsigned char *, 1+ (struct p_info const *)(1+ li)); // &b_info
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xi.size = sz_compressed - (sizeof(struct l_info) + sizeof(struct p_info));
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xo.buf = (unsigned char *)mhdr;
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xo.size = ((struct b_info const *)(void const *)xi.buf)->sz_unc;
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xi0 = xi;
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// Uncompress Macho headers
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unpackExtent(&xi, &xo, f_decompress, 0); // never filtered?
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entry = do_xmap(mhdr, fat_offset, &xi0, MAP_ANON_FD, mhdrpp, f_decompress, f_unf);
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{ // Map dyld dynamic loader
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Mach_load_command const *lc = (Mach_load_command const *)(1+ mhdr);
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unsigned j;
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for (j=0; j < mhdr->ncmds; ++j,
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(lc = (Mach_load_command const *)(lc->cmdsize + (void const *)lc))
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) if (LC_LOAD_DYLINKER==lc->cmd) {
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char const *const dyld_name = ((Mach_lc_str const *)(1+ lc))->offset +
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(char const *)lc;
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int const fdi = open(dyld_name, O_RDONLY, 0);
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if (0 > fdi) {
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err_exit(18);
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}
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fat:
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if ((ssize_t)sz_mhdr!=pread(fdi, (void *)mhdr, sz_mhdr, fat_offset)) {
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ERR_LAB
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err_exit(19);
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}
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switch (mhdr->magic) {
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case MH_MAGIC: break;
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case FAT_MAGIC: {
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// stupid Apple: waste code and a page fault on EVERY execve
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Fat_header *const fh = (Fat_header *)mhdr;
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Fat_arch *fa = (Fat_arch *)(1+ fh);
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bswap(fh, sizeof(*fh) + (fh->nfat_arch>>24)*sizeof(*fa));
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for (j= 0; j < fh->nfat_arch; ++j, ++fa) {
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if (CPU_TYPE_ARM==fa->cputype) {
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fat_offset= fa->offset;
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goto fat;
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}
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}
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} break;
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} // switch
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entry = do_xmap(mhdr, fat_offset, 0, fdi, 0, 0, 0);
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close(fdi);
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break;
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}
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}
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return entry;
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}
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/*
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vi:ts=4:et:nowrap
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*/
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