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https://github.com/upx/upx
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9cb8d7bca6
Added Files: l_mac_ppc32.S fold_machppc32.S m_mac_mach32.c l_mac_ppc32.h fold_machppc32.h [these two created by Makefile] committer: jreiser <jreiser> 1108860254 +0000
72 lines
2.2 KiB
ArmAsm
72 lines
2.2 KiB
ArmAsm
/*
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* l_mac_ppc32.S -- program entry point & decompressor (PowerPC32 Mach-o)
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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) 2005 John F. 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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* John F. Reiser
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* <jreiser@users.sourceforge.net>
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*
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*/
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#include "ppc_regs.h"
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/*__MACOS000__*/
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_start: .globl _start
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call main # must be exactly 1 instruction; link_register= &decompress
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#include "ppc_d_nrv2e.S"
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sz_b_info= 12
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sz_unc= 0
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sz_cpr= 4
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/* Decompress the rest of this loader, and jump to it. */
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unfold:
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mflr t0 # -4+ &{ b_info={sz_unc, sz_cpr, {4 char}}, folded_loader...}
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lwz lsrc,4+sz_cpr(t0); mtctr lsrc # length to copy (and decompress)
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lwz ldst,4+sz_unc(t0)
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add dst,lsrc,t0; addi dst,dst,4+sz_b_info
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add src,ldst,t0; addi src,src,GAP+64 # defend against prefetch and overlap
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movup: # descending copy moves folded_loader to higher address
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lbzu r0,-1(dst)
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stbu r0,-1(src)
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bdnz+ movup # typical count is about 0x4cb(1227) bytes
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mtctr r31 # &decompress
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addi dst,t0,GAP # &unfolded result
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la ldst,-4(sp) # &sz_result [will be ignored]
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bctr # call decompress: branch to counter register, return to link register
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main:
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mflr r31 # r31= &decompress
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call unfold
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L100: GAP= 128 # > farthest_prefetch; must match ../p_mach.cpp
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b GAP+L100 # 'isync' has trouble on Macintosh G4?
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/* { b_info={sz_unc, sz_cpr, {4 char}}, folded_loader...} */
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eof:
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/*__XTHEENDX__*/
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/*
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vi:ts=8:et:nowrap
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*/
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