Markus F.X.J. Oberhumer
aa540f85fa
Packer::getCompressionMethods(), improved Packer::compressWithFilters(). committer: mfx <mfx> 978449945 +0000
127 lines
3.2 KiB
NASM
127 lines
3.2 KiB
NASM
; l_sys.asm -- loader & decompressor for the dos/sys format
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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) 1996-2001 Markus Franz Xaver Johannes Oberhumer
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; Copyright (C) 1996-2001 Laszlo Molnar
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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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; markus.oberhumer@jk.uni-linz.ac.at ml1050@cdata.tvnet.hu
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;
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%define SYS 1
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%define COM 0
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%define CJT16 1
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%define jmps jmp short
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%define jmpn jmp near
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%include "macros.ash"
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BITS 16
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ORG 0
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SECTION .text
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; =============
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; ============= ENTRY POINT
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; =============
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; __SYSMAIN1__
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start:
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dd -1
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dw 0
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dw strategy ; .sys header
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dw 0 ; opendos wants this field untouched
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strategy:
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%ifdef __SYSI2861__
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pusha
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%else; __SYSI0861__
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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push bp
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%endif; __SYSMAIN2__
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mov si, 'SI'
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mov di, 'DI'
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mov cx, si ; at the end of the copy si will be 0
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push es
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push ds
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pop es
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std
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rep
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movsb
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cld
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mov bx, 0x8000
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xchg si, di
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sub si, byte start - cutpoint
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; __SYSSUBSI__
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sbb bp, bp
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%ifdef __SYSCALLT__
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push di
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%endif; __SYSMAIN3__
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jmpn .1+'JM' ; jump to the decompressor
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.1:
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%include "header.ash"
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cutpoint:
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; __SYSCUTPO__
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; =============
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; ============= DECOMPRESSION
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; =============
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%include "n2b_d16.ash"
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; =============
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; ============= CALLTRICK
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; =============
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; =============
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; __SYSMAIN5__
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pop es
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%ifdef __SYSI2862__
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popa
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%else; __SYSI0862__
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pop bp
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pop di
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pop si
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pop dx
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pop cx
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pop bx
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pop ax
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%endif; __SYSJUMP1__
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jmpn eof+'JO'
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eof:
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; __SYSTHEND__
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section .data
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dd -1
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dw eof
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; vi:ts=8:et:nowrap
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