Markus F.X.J. Oberhumer
185 lines
5.4 KiB
NASM
185 lines
5.4 KiB
NASM
; l_ps1.asm -- ps1/exe program entry & decompressor
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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) 2002-2004 Jens Medoch
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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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; Jens Medoch
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; <jssg@users.sourceforge.net>
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;
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#include <mr3k/macros.ash>
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#define SZ_REG 4
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do_regs MACRO _w
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_w at,SZ_REG*0(sp)
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_w a0,SZ_REG*1(sp)
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_w a1,SZ_REG*2(sp)
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_w a2,SZ_REG*3(sp)
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_w a3,SZ_REG*4(sp)
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_w v0,SZ_REG*5(sp)
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_w v1,SZ_REG*6(sp)
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_w ra,SZ_REG*7(sp)
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do_regs ENDM
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#define REG_SZ (8*SZ_REG)
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#define HI(a) (a >> 16)
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#define LO(a) (a & 0xffff)
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ORG 0
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; =============
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; ============= ENTRY POINT
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; =============
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entry:
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; __PS1MAIN0__
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addiu at,zero,'LS' ; size of decomp. routine
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subu sp,at ; adjust the stack with this size
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do_regs sw ; push used regs
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subiu a0,at,REG_SZ ; a0 = counter copyloop
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addiu a3,sp,REG_SZ ; get offset for decomp. routine
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move a1,a3
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li a2,'DCRT' ; load decompression routine's offset
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copyloop:
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addi a0,-4
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lw at,0(a2) ; memcpy *a2 -> at -> *a1
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addiu a2,4
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sw at,0(a1)
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bnez a0,copyloop
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addiu a1,4
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li a0,'COMP' ; load COMPDATA HI offset
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; li a1,'CDSZ' ; compressed data size !disabled
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; __PS1MAINZ__
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; =============
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; __PS1JSTA0__
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lui a2,HI('DECO') ; load DECOMPDATA HI offset
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jr a3
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ori a2,LO('DECO') ; load DECOMPDATA LO offset
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; __PS1JSTAZ__
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; __PS1JSTH0__
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jr a3
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lui a2,HI('DECO') ; same for HI only !(offset&0xffff)
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; __PS1JSTHZ__
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; =============
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; ============= DECOMPRESSION
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; =============
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#if 1
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# define NRV_BB 8
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#else
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# define NRV_BB 32
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#endif
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#if 1
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# define SMALL
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#endif
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; __PS1DECO0__
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; __PS1DECOZ__
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; __PS1N2BD0__
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#include <mr3k/n2b_d.ash>
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; __PS1N2BDZ__
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; __PS1N2DD0__
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#include <mr3k/n2d_d.ash>
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; __PS1N2DDZ__
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; __PS1N2ED0__
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#include <mr3k/n2e_d.ash>
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; __PS1N2EDZ__
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; =============
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; __MSETBIG0__
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ori a0,zero,'SC' ; amount of removed zero's at eof
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sll a0,3 ; (cd mode 2 data sector alignment)
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; __MSETBIGZ__
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; __MSETSML0__
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ori a0,zero,'SC' ; amount of removed zero's at eof
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; __MSETSMLZ__
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; =============
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; __MSETALG0__
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memset_aligned:
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addi a0,-4
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sw zero,0(a2)
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bnez a0,memset_aligned
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addiu a2,4
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; __MSETALGZ__
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; __MSETUAL0__
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memset_unaligned:
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addi a0,-4
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swl zero,3(a2)
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swr zero,0(a2)
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bnez a0,memset_unaligned
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addiu a2,4
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; __MSETUALZ__
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; =============
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; __PS1EXIT0__
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li t2,160 ; flushes
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jalr ra,t2 ; instruction
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li t1,68 ; cache
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do_regs lw ; pop used regs
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DW 'JPEP' ; marker for the entry jump
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addu sp,at
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; __PS1EXITZ__
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; =============
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; __PS1PHDR0__
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DB 85,80,88,33 ; 0 UPX_MAGIC_LE32
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; another magic for PackHeader::putPackHeader
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DB 161,216,208,213 ; UPX_MAGIC2_LE32
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DW 0 ; 8 uncompressed adler32
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DW 0 ; 12 compressed adler32
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DW 0 ; 16 uncompressed len
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DW 0 ; 20 compressed len
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DW 0 ; 24 original file size
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DB 0 ; 28 filter id
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DB 0 ; 29 filter cto
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DB 0 ; unsused
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DB 45 ; 31 header checksum
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; __PS1PHDRZ__
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; =============
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; __PS1RGSZ0__
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DW REG_SZ
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; __PS1RGSZZ__
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eof:
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; section .data
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DW -1
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DH eof
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; vi:ts=8:et:nowrap
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