tuning

amd_bxx.S amd_d_nrv2b.S amd_d_nrv2e.S l_lx_elf64amd.S

committer: jreiser <jreiser> 1131939243 +0000

src/stub/amd_d_nrv2b.S

@@ -0,0 +1,63 @@
+/* amd_d_nrv2b.S -- AMD64 decompressor for NRV2B
+
+   This file is part of the UPX executable compressor.
+
+   Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1996-2004 Laszlo Molnar
+   Copyright (C) 2000-2005 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.
+
+   Markus F.X.J. Oberhumer              Laszlo Molnar
+   <mfx@users.sourceforge.net>          <ml1050@users.sourceforge.net>
+
+   John F. Reiser
+   <jreiser@users.sourceforge.net>
+*/
+
+	ALIGN(1<<3)
+lit_n2b:
+	movb (%rsi),%al; addq $1,%rsi
+	movb %al,(%rdi); addq $1,%rdi
+top_n2b:
+	jnextb1y lit_n2b
+	lea 1(lenq),off  # [len= 0] off= 1
+offmore_n2b:
+	getnextb(off)
+	jnextb0n offmore_n2b
+
+	movzbl (%rsi),%edx
+	subl $ 3,off; jc len_n2b  # use previous offset
+	shll $ 8,off
+	orl %edx,off; incq %rsi
+	xorl $~0,off; jz eof
+	movslq off,disp  # XXX: 2GB
+len_n2b:
+	lea 1(lenq),off  # [len= 0] off= 1
+	getnextb(len); getnextb(len)  # two bits; cc set on result
+	jnz gotlen_n2b  # raw 1,2,3 ==> 2,3,4
+	movl off,len  # len= 1, the msb
+	addl $3-1,off  # raw 2.. ==> 5..
+lenmore_n2b:
+	getnextb(len)
+	jnextb0n lenmore_n2b
+gotlen_n2b:
+	cmpq $-0xd00,disp
+	adcl off,len  # len += off + (disp < -0xd00)
+	call copy
+bot_n2b:  # In: 0==len
+        jmp top_n2b