Markus F.X.J. Oberhumer
188 lines
4.6 KiB
NASM
188 lines
4.6 KiB
NASM
; l_lx_pti86.asm -- Linux separate ELF PT_INTERP
|
|
;
|
|
; This file is part of the UPX executable compressor.
|
|
;
|
|
; Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer
|
|
; Copyright (C) 1996-2004 Laszlo Molnar
|
|
; Copyright (C) 2000-2004 John F. 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.
|
|
;
|
|
; Markus F.X.J. Oberhumer Laszlo Molnar
|
|
; <mfx@users.sourceforge.net> <ml1050@users.sourceforge.net>
|
|
;
|
|
; John F. Reiser
|
|
; <jreiser@users.sourceforge.net>
|
|
;
|
|
|
|
|
|
BITS 32
|
|
SECTION .text
|
|
CPU 386
|
|
|
|
%define jmps jmp short
|
|
%define jmpn jmp near
|
|
|
|
; /*************************************************************************
|
|
; // program entry point
|
|
; // see glibc/sysdeps/i386/elf/start.S
|
|
; **************************************************************************/
|
|
|
|
GLOBAL _start
|
|
;__LXPTI000__
|
|
_start:
|
|
;;;; int3
|
|
;; How to debug this code: Uncomment the 'int3' breakpoint instruction above.
|
|
;; Build the stubs and upx. Compress a testcase, such as a copy of /bin/date.
|
|
;; Invoke gdb, and give a 'run' command. Define a single-step macro such as
|
|
;; define g
|
|
;; stepi
|
|
;; x/i $pc
|
|
;; end
|
|
;; and a step-over macro such as
|
|
;; define h
|
|
;; x/2i $pc
|
|
;; tbreak *$_
|
|
;; continue
|
|
;; x/i $pc
|
|
;; end
|
|
;; Step through the code; remember that <Enter> repeats the previous command.
|
|
;;
|
|
call L200 ; push address of get_funf
|
|
get_funf:
|
|
cmp eax, byte 0x46
|
|
mov ecx, unf46
|
|
je L110
|
|
cmp eax, byte 0x49
|
|
mov ecx, unf49
|
|
je L110
|
|
L120:
|
|
mov ecx, none
|
|
L110:
|
|
mov eax, ecx
|
|
none:
|
|
ret
|
|
|
|
%define M_NRV2B_LE32 2
|
|
%define M_NRV2D_LE32 5
|
|
%define M_NRV2E_LE32 8
|
|
%define M_CL1B_LE32 11
|
|
|
|
L200:
|
|
call L300 ; push address of get_fexp
|
|
get_fexp:
|
|
cmp eax, byte M_NRV2B_LE32
|
|
mov ecx, nrv2b
|
|
je L110
|
|
cmp eax, byte M_NRV2D_LE32
|
|
mov ecx, nrv2d
|
|
je L110
|
|
cmp eax, byte M_NRV2E_LE32
|
|
mov ecx, nrv2e
|
|
je L110
|
|
cmp eax, byte M_CL1B_LE32
|
|
mov ecx, cl1b
|
|
je L110
|
|
jmpn L120
|
|
|
|
; /*************************************************************************
|
|
; // C callable decompressor
|
|
; **************************************************************************/
|
|
;__LXPTI040__
|
|
nrv2b:
|
|
;__LXPTI041__
|
|
nrv2d:
|
|
;__LXPTI042__
|
|
nrv2e:
|
|
;__LXPTI043__
|
|
cl1b:
|
|
|
|
%define INP dword [esp+8*4+1*4]
|
|
%define INS dword [esp+8*4+2*4]
|
|
%define OUTP dword [esp+8*4+3*4]
|
|
%define OUTS dword [esp+8*4+4*4]
|
|
|
|
;__LXPTI050__
|
|
pusha
|
|
; cld
|
|
or ebp, byte -1
|
|
mov esi, INP
|
|
mov edi, OUTP
|
|
;;; align 8
|
|
|
|
%include "n2b_d32.ash"
|
|
%include "n2d_d32.ash"
|
|
%include "n2e_d32.ash"
|
|
%include "cl1_d32.ash"
|
|
;__LXPTI090__
|
|
jmpn exp_done
|
|
;__LXPTI091__
|
|
; eax is 0 from decompressor code
|
|
;xor eax, eax ; return code
|
|
exp_done:
|
|
; check compressed size
|
|
mov edx, INP
|
|
add edx, INS
|
|
cmp esi, edx
|
|
jz .ok
|
|
dec eax
|
|
.ok:
|
|
|
|
; write back the uncompressed size
|
|
sub edi, OUTP
|
|
mov edx, OUTS
|
|
mov [edx], edi
|
|
|
|
mov [7*4 + esp], eax
|
|
popa
|
|
ret
|
|
|
|
%include "macros.ash"
|
|
cjt32 0
|
|
ctojr32
|
|
|
|
;__LXPTI140__
|
|
unf46:
|
|
;__LXPTI141__
|
|
unf49:
|
|
|
|
%define CTO8 dword [esp+8*4+3*4]
|
|
|
|
;__LXPTI150__
|
|
pusha
|
|
mov edi,INP
|
|
mov ecx,INS
|
|
mov edx,CTO8
|
|
|
|
ckt32 edi, dl
|
|
|
|
;__LXPTI160__
|
|
popa
|
|
ret
|
|
|
|
;__LXPTI200__
|
|
L300:
|
|
|
|
eof:
|
|
; __XTHEENDX__
|
|
section .data
|
|
dd -1
|
|
dw eof
|
|
|
|
; vi:ts=8:et:nowrap
|
|
|