mirror of
https://github.com/upx/upx
synced 2025-09-28 19:06:07 +08:00
0516d8260c
[The confusing fake "conditional compilation" strikes again!] committer: jreiser <jreiser> 1103513713 +0000
149 lines
4.8 KiB
NASM
149 lines
4.8 KiB
NASM
; l_vmlinx.asm -- loader & decompressor for the vmlinux/i386 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) 1996-2004 Markus Franz Xaver Johannes Oberhumer
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; Copyright (C) 1996-2004 Laszlo Molnar
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; Copyright (C) 2004 John Reiser
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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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; <mfx@users.sourceforge.net> <ml1050@users.sourceforge.net>
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;
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; John Reiser
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; <jreiser@users.sourceforge.net>
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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 32
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SECTION .text
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ORG 0
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; =============
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; ============= ENTRY POINT
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; =============
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start:
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; In:
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; %eax= &uncompressed [and final entry]; %ds= %es= __BOOT_DS
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; %esp: &compressed; __BOOT_CS
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; __LINUX000__
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pop edx ; &compressed; length at -4(%edx)
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push eax ; MATCH00(1/2) entry address; __BOOT_CS
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push edi ; MATCH01 save
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push esi ; MATCH02 save
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%ifdef __LXCALLT1__
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push eax ; MATCH03 src unfilter
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%endif; __LXDUMMY0__
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%ifdef __LXCKLLT1__
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push eax ; MATCH03 src unfilter
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push byte '?' ; MATCH04 cto unfilter
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%endif; __LXMOVEUP__
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push 'ULEN' ; MATCH05 uncompressed length
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call move_up ; MATCH06
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; =============
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; ============= DECOMPRESSION
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; =============
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%include "n2b_d32.ash"
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%include "n2d_d32.ash"
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%include "n2e_d32.ash"
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;;%include "cl1_d32.ash"
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; =============
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; ============= UNFILTER
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; =============
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%ifdef __LXCKLLT9__
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pop ecx ; MATCH05 len
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pop edx ; MATCH04 cto
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pop edi ; MATCH03 src
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ckt32 edi, dl ; dl has cto8
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;edi: adjust for the difference between 0 origin of buffer at filter,
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;and actual origin of destination at unfilter.
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;Filter.addvalue is 0: destination origin is unknown at filter time.
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;The input data is still relocatable, and address is assigned later
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;[as of 2004-12-15 it is 'always' 0x100000].
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%endif; __LXDUMMY2__
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%ifdef __LXCALLT9__
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pop ecx ; MATCH05 len
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pop edi ; MATCH03 src
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cjt32 0
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%endif; __LINUX990__
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pop esi ; MATCH02 restore
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pop edi ; MATCH01 restore
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xor ebx, ebx ; booting the 1st cpu
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retf ; MATCH00 set cs
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%define UNLAP 0x10
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%define ALIGN (~0<<4)
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; must have 0==(UNLAP &~ ALIGN)
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move_up:
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pop esi ; MATCH06 &decompressor
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mov ecx,[-4+ esi] ; length of decompressor+unfilter
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mov ebp,eax ; &uncompressed
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add eax,[esp] ; MATCH05 ULEN + base; entry to decompressor
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add eax, byte ~ALIGN + UNLAP
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and eax, byte ALIGN
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std
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; copy decompressor
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lea esi,[-1+ ecx + esi] ; unmoved top -1 of decompressor
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lea edi,[-1+ ecx + eax] ; moved top -1 of decompressor
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rep
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movsb
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mov ecx,[-4+ edx] ; length of compressed data
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add ecx, byte 3
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shr ecx,2 ; count of .long
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; copy compressed data
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lea esi,[-4+ 4*ecx + edx] ; unmoved top -4 of compressed data
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lea edi,[-4+ eax] ; moved top -4 of compressed data
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rep
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movsd
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cld
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lea esi,[4+ edi] ; &compressed [after move]
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mov edi,ebp ; &uncompressed
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or ebp, byte -1 ; decompressor assumption
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jmp eax ; enter moved decompressor
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; =============
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; ============= CUT HERE
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; =============
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%include "header.ash"
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eof:
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; __LITHEEND__
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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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