i086-dos16.com.s

UPX 源代码

/*
;  i086-dos16.com.S -- loader & decompressor for the dos/com format
;
;  This file is part of the UPX executable compressor.
;
;  Copyright (C) 1996-2007 Markus Franz Xaver Johannes Oberhumer
;  Copyright (C) 1996-2007 Laszlo Molnar
;  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
;  <[e-mail]>          <[e-mail]>
;
*/

#define         COM     1
#define         CJT16   1
#include        "arch/i086/macros.S"


/*
; =============
; ============= ENTRY POINT
; =============
*/

section         COMMAIN1
                cmp     sp, offset sp_limit
                ja      mem_ok
                int     0x20
mem_ok:
                mov     cx, offset bytes_to_copy  /* size of decomp + sizeof (data) + 1 */
                mov     si, offset copy_source    /* cx + 0x100 */
                mov     di, offset copy_destination
                mov     bx, 0x8000

                std
                rep
                movsb
                cld

                xchg    di, si
                .byte   0x83, 0xee, neg_e_len /* sub si, xxx -- sets bit C for sbb below */
section         COMSBBBP
                sbb     bp, bp
section         COMPSHDI
                push    di
section         COMCALLT
                push    di
section         COMMAIN2
                jmp     decomp_start_n2b

#include        "include/header.S"

section         COMCUTPO

#include        "arch/i086/nrv2b_d16.S"  /* decompressor & calltrick */

section         CORETURN
                ret
/*
; vi:ts=8:et:nowrap
*/