László Molnár
183 lines
4.6 KiB
ArmAsm
183 lines
4.6 KiB
ArmAsm
/*
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; i386-linux.elf.interp-entry.S -- Linux separate ELF PT_INTERP
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;
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; This file is part of the UPX executable compressor.
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;
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; Copyright (C) 1996-2006 Markus Franz Xaver Johannes Oberhumer
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; Copyright (C) 1996-2006 Laszlo Molnar
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; Copyright (C) 2000-2006 John F. Reiser
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; All Rights Reserved.
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;
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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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;
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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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;
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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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;
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; Markus F.X.J. Oberhumer Laszlo Molnar
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; <mfx@users.sourceforge.net> <ml1050@users.sourceforge.net>
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;
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; John F. Reiser
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; <jreiser@users.sourceforge.net>
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;
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*/
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#include "arch/i386/macros.S"
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// CPU 386
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/*************************************************************************
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// program entry point
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// see glibc/sysdeps/i386/elf/start.S
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**************************************************************************/
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section LXPTI000
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_start: .globl _start
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//// int3
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/*
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;; How to debug this code: Uncomment the 'int3' breakpoint instruction above.
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;; Build the stubs and upx. Compress a testcase, such as a copy of /bin/date.
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;; Invoke gdb, and give a 'run' command. Define a single-step macro such as
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;; define g
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;; stepi
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;; x/i $pc
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;; end
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;; and a step-over macro such as
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;; define h
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;; x/2i $pc
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;; tbreak *$_
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;; continue
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;; x/i $pc
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;; end
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;; Step through the code; remember that <Enter> repeats the previous command.
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;;
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*/
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call L200 // push address of get_funf
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get_funf:
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cmp eax, 0x46
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mov ecx, unf46
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je L110
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cmp eax, 0x49
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mov ecx, unf49
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je L110
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L120:
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mov ecx, none
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L110:
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mov eax, ecx
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none:
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ret
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#define M_NRV2B_LE32 2
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#define M_NRV2D_LE32 5
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#define M_NRV2E_LE32 8
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#define M_CL1B_LE32 11
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#define M_LZMA 14
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L200:
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call L300 // push address of get_fexp
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get_fexp:
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cmp eax, M_NRV2B_LE32
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mov ecx, nrv2b
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je L110
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cmp eax, M_NRV2D_LE32
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mov ecx, nrv2d
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je L110
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cmp eax, M_NRV2E_LE32
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mov ecx, nrv2e
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je L110
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cmp eax, M_CL1B_LE32
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mov ecx, cl1b
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je L110
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jmp L120
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/*************************************************************************
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// C callable decompressor
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**************************************************************************/
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section LXPTI040
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nrv2b:
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section LXPTI041
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nrv2d:
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section LXPTI042
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nrv2e:
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section LXPTI043
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cl1b:
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#define INP dword ptr [esp+8*4+1*4]
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#define INS dword ptr [esp+8*4+2*4]
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#define OUTP dword ptr [esp+8*4+3*4]
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#define OUTS dword ptr [esp+8*4+4*4]
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section LXPTI050
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pusha
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// cld
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or ebp, -1
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mov esi, INP
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mov edi, OUTP
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// align 8
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#include "arch/i386/nrv2b_d32.S"
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#include "arch/i386/nrv2d_d32.S"
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#include "arch/i386/nrv2e_d32.S"
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#include "arch/i386/cl1_d32.S"
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#include "arch/i386/lzma_d.S"
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section LXPTI090
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jmp exp_done
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section LXPTI091
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// eax is 0 from decompressor code
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//xor eax, eax ; return code
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exp_done:
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// check compressed size
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mov edx, INP
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add edx, INS
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cmp esi, edx
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jz .ok
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dec eax
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.ok:
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// write back the uncompressed size
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sub edi, OUTP
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mov edx, OUTS
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mov [edx], edi
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mov [7*4 + esp], eax
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popa
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ret
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cjt32 0
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ctojr32
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section LXPTI140
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unf46:
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section LXPTI141
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unf49:
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#define CTO8 dword ptr [esp+8*4+3*4]
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section LXPTI150
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pusha
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mov edi,INP
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mov ecx,INS
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mov edx,CTO8
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ckt32 edi, dl
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section LXPTI160
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popa
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ret
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section LXPTI200
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L300:
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eof:
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// vi:ts=8:et:nowrap
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