97 lines
2.4 KiB
NASM
97 lines
2.4 KiB
NASM
; l_com.asm -- loader & decompressor for the dos/com 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) 1996-2000 Markus Franz Xaver Johannes Oberhumer
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; Copyright (C) 1996-2000 Laszlo Molnar
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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 COM 1
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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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; __COMMAIN1__
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start:
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cmp sp, 'SP'
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ja mem_ok
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int 0x20
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mem_ok:
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mov cx, 'CX' ; size of decomp + sizeof (data) + 1
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mov si, 'SI' ; cx + 0x100
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mov di, 'DI'
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mov bx, 0x8000
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std
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rep
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movsb
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cld
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xchg si, di
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sub si, byte start - cutpoint
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; __COMSUBSI__
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sbb bp, bp
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push di
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%ifdef __COMCALLT__
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push di
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%endif; __COMMAIN2__
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jmpn .1+'JM'
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.1:
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%include "header.ash"
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cutpoint:
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; __COMCUTPO__
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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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; __CORETURN__
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ret
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eof:
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; __COMTHEND__
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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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