Initial commit (from git)

2000-05-19 16:04:55 +00:00
commit 1a9128a473
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+;  l_sys.asm -- loader & decompressor for the dos/sys format
+;
+;  This file is part of the UPX executable compressor.
+;
+;  Copyright (C) 1996-2000 Markus Franz Xaver Johannes Oberhumer
+;  Copyright (C) 1996-2000 Laszlo Molnar
+;
+;  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
+;  markus.oberhumer@jk.uni-linz.ac.at        ml1050@cdata.tvnet.hu
+;
+
+
+%define         SYS     1
+%define         COM     0
+%define         CJT16   1
+%define         jmps    jmp short
+%include        "macros.ash"
+
+                BITS    16
+                ORG     0
+                SECTION .text
+
+; =============
+; ============= ENTRY POINT
+; =============
+
+;       __SYSMAIN1__
+start:
+                dd      -1
+                dw      0
+                dw      strategy        ; .sys header
+                dw      0               ; opendos wants this field untouched
+strategy:
+%ifdef  __SYSI2861__
+                pusha
+%else;  __SYSI0861__
+                push    ax
+                push    bx
+                push    cx
+                push    dx
+                push    si
+                push    di
+                push    bp
+%endif; __SYSMAIN2__
+                mov     si, 'SI'
+                mov     di, 'DI'
+
+                mov     cx, si          ; at the end of the copy si will be 0
+
+                push    es
+                push    ds
+                pop     es
+
+                std
+                rep
+                movsb
+                cld
+
+                mov     bx, 0x8000
+
+                xchg    si, di
+                sub     si, byte start - cutpoint
+;       __SYSSUBSI__
+                sbb     bp, bp
+%ifdef  __SYSCALLT__
+                push    di
+%endif; __SYSMAIN3__
+                jmp     .1+'JM'         ; jump to the decompressor
+.1:
+%include        "header.ash"
+
+cutpoint:
+;       __SYSCUTPO__
+
+; =============
+; ============= DECOMPRESSION
+; =============
+
+%include        "n2b_d16.ash"
+
+; =============
+; ============= CALLTRICK
+; =============
+
+
+; =============
+
+;       __SYSMAIN5__
+                pop     es
+%ifdef  __SYSI2862__
+                popa
+%else;  __SYSI0862__
+                pop     bp
+                pop     di
+                pop     si
+                pop     dx
+                pop     cx
+                pop     bx
+                pop     ax
+%endif; __SYSJUMP1__
+                jmp     eof+'JO'
+eof:
+;       __SYSTHEND__
+                section .data
+                dd      -1
+                dw      eof
+
+
+; vi:ts=8:et:nowrap