Markus F.X.J. Oberhumer
142 lines
4.9 KiB
ArmAsm
142 lines
4.9 KiB
ArmAsm
/*
|
|
; i386-linux.kernel.vmlinux.S -- loader & decompressor for the vmlinux/i386 format
|
|
;
|
|
; This file is part of the UPX executable compressor.
|
|
;
|
|
; Copyright (C) 1996-2006 Markus Franz Xaver Johannes Oberhumer
|
|
; Copyright (C) 1996-2006 Laszlo Molnar
|
|
; Copyright (C) 2004-2006 John Reiser
|
|
; 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
|
|
; <mfx@users.sourceforge.net> <ml1050@users.sourceforge.net>
|
|
;
|
|
; John Reiser
|
|
; <jreiser@users.sourceforge.net>
|
|
*/
|
|
|
|
#include "arch/i386/macros.S"
|
|
|
|
/*
|
|
; =============
|
|
; ============= ENTRY POINT
|
|
; =============
|
|
|
|
; In:
|
|
; #eax= &uncompressed [and final entry]; #ds= #es= __BOOT_DS
|
|
; #esp: &compressed; __BOOT_CS
|
|
|
|
How to debug: run under qemu (http://fabrice.bellard.free.fr/qemu/)
|
|
after un-commenting the 0xf1 opcode below. That opcode forces qemu
|
|
to stop in gdb. You'll have to "set $pc+=1" by hand.
|
|
*/
|
|
section LINUX000
|
|
//// .byte 0xf1 // qemu In-Circuit-Emulator breakpoint
|
|
pop edx // &compressed; length at -4(#edx)
|
|
|
|
push eax // MATCH00(1/2) entry address; __BOOT_CS
|
|
push edi // MATCH01 save
|
|
push esi // MATCH02 save
|
|
|
|
section LXCALLT1
|
|
push eax // MATCH03 src unfilter
|
|
section LXCKLLT1
|
|
push eax // MATCH03 src unfilter
|
|
//push offset filter_cto // MATCH04 cto unfilter
|
|
.byte 0x6a, filter_cto // MATCH04 cto unfilter
|
|
section LXMOVEUP
|
|
push offset filter_length // MATCH05 uncompressed length
|
|
call move_up // MATCH06
|
|
|
|
// =============
|
|
// ============= DECOMPRESSION
|
|
// =============
|
|
|
|
#include "arch/i386/nrv2b_d32.S"
|
|
#include "arch/i386/nrv2d_d32.S"
|
|
#include "arch/i386/nrv2e_d32.S"
|
|
#include "arch/i386/lzma_d.S"
|
|
|
|
// =============
|
|
// ============= UNFILTER
|
|
// =============
|
|
|
|
section LXCKLLT9
|
|
pop ecx // MATCH05 len
|
|
pop edx // MATCH04 cto
|
|
pop edi // MATCH03 src
|
|
|
|
ckt32 edi, dl // dl has cto8
|
|
/*
|
|
;edi: adjust for the difference between 0 origin of buffer at filter,
|
|
;and actual origin of destination at unfilter.
|
|
;Filter.addvalue is 0: destination origin is unknown at filter time.
|
|
;The input data is still relocatable, and address is assigned later
|
|
;[as of 2004-12-15 it is 'always' 0x100000].
|
|
*/
|
|
|
|
section LXCALLT9
|
|
pop ecx // MATCH05 len
|
|
pop edi // MATCH03 src
|
|
cjt32 0
|
|
section LINUX990
|
|
pop esi // MATCH02 restore
|
|
pop edi // MATCH01 restore
|
|
xor ebx, ebx // booting the 1st cpu
|
|
lret // MATCH00 set cs
|
|
|
|
#define UNLAP 0x10
|
|
#define ALIGN (~0<<4)
|
|
// must have 0==(UNLAP &~ ALIGN)
|
|
|
|
move_up:
|
|
pop esi // MATCH06 &decompressor
|
|
mov ecx,[-4+ esi] // length of decompressor+unfilter
|
|
mov ebp,eax // &uncompressed
|
|
add eax,[esp] // MATCH05 ULEN + base; entry to decompressor
|
|
add eax, ~ALIGN + UNLAP
|
|
and eax, ALIGN
|
|
|
|
std
|
|
// copy decompressor
|
|
lea esi,[-1+ ecx + esi] // unmoved top -1 of decompressor
|
|
lea edi,[-1+ ecx + eax] // moved top -1 of decompressor
|
|
rep
|
|
movsb
|
|
|
|
mov ecx,[-4+ edx] // length of compressed data
|
|
add ecx, 3
|
|
shr ecx,2 // count of .long
|
|
// copy compressed data
|
|
lea esi,[-4+ 4*ecx + edx] // unmoved top -4 of compressed data
|
|
lea edi,[-4+ eax] // moved top -4 of compressed data
|
|
rep
|
|
movsd
|
|
|
|
cld
|
|
lea esi,[4+ edi] // &compressed [after move]
|
|
mov edi,ebp // &uncompressed
|
|
section LINUX991
|
|
or ebp, -1 // decompressor assumption
|
|
section LINUX992
|
|
jmp eax // enter moved decompressor
|
|
|
|
#include "include/header.S"
|
|
|
|
// vi:ts=8:et:nowrap
|