stub loader for Macintosh (Darwin) Mach-o PowerPC32

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
2005-02-20 00:44:14 +00:00
parent 46f9256114
commit 9cb8d7bca6
5 changed files with 812 additions and 0 deletions
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+/*
+ *  l_mac_ppc32.S -- program entry point & decompressor (PowerPC32 Mach-o)
+ *
+ *  This file is part of the UPX executable compressor.
+ *
+ *  Copyright (C) 2005 John F. 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.
+ *
+ *  John F. Reiser
+ *  <jreiser@users.sourceforge.net>
+ *
+ */
+
+#include "ppc_regs.h"
+
+/*__MACOS000__*/
+_start: .globl _start
+        call main  # must be exactly 1 instruction; link_register= &decompress
+#include "ppc_d_nrv2e.S"
+
+sz_b_info= 12
+  sz_unc= 0
+  sz_cpr= 4
+
+/* Decompress the rest of this loader, and jump to it. */
+unfold:
+        mflr t0  # -4+ &{ b_info={sz_unc, sz_cpr, {4 char}}, folded_loader...}
+
+        lwz lsrc,4+sz_cpr(t0); mtctr lsrc  # length to copy (and decompress)
+        lwz ldst,4+sz_unc(t0)
+        add  dst,lsrc,t0; addi dst,dst,4+sz_b_info
+        add  src,ldst,t0; addi src,src,GAP+64  # defend against prefetch and overlap
+movup:  # descending copy moves folded_loader to higher address
+        lbzu r0,-1(dst)
+        stbu r0,-1(src)
+        bdnz+ movup  # typical count is about 0x4cb(1227) bytes
+
+	mtctr r31  # &decompress
+        addi dst,t0,GAP  # &unfolded result
+	la  ldst,-4(sp)  # &sz_result [will be ignored]
+	bctr  # call decompress: branch to counter register, return to link register
+
+main:
+	mflr r31  # r31= &decompress
+        call unfold
+L100: GAP= 128  # > farthest_prefetch; must match ../p_mach.cpp
+        b GAP+L100  # 'isync' has trouble on Macintosh G4?
+	/* { b_info={sz_unc, sz_cpr, {4 char}}, folded_loader...} */
+
+eof:
+/*__XTHEENDX__*/
+
+/*
+vi:ts=8:et:nowrap
+*/
+