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Add a script for converting ads arm assembly to microsoft armasm format

The formats are basically the same, but a few minor details need
to be adjusted. Addiitonally, when building for the WinRT/Windows
Phone 8 platforms, one has to build for thumb, so convert instructions
accordingly.

Change-Id: I3c3902aa20fd3bfc29168d3a1bf17111e5481dcb

--- a/build/make/Makefile

+++ b/build/make/Makefile

@@ -381,6 +381,7 @@

     DIST-SRCS-$(ARCH_ARM)$(ARCH_X86)$(ARCH_X86_64)    += build/make/obj_int_extract.c

     DIST-SRCS-$(ARCH_ARM)    += build/make/ads2gas.pl

     DIST-SRCS-$(ARCH_ARM)    += build/make/ads2gas_apple.pl

+    DIST-SRCS-$(ARCH_ARM)    += build/make/ads2armasm_ms.pl

     DIST-SRCS-$(ARCH_ARM)    += build/make/thumb.pm

     DIST-SRCS-yes            += $(target:-$(TOOLCHAIN)=).mk

 endif

--- /dev/null

+++ b/build/make/ads2armasm_ms.pl

@@ -1,0 +1,38 @@

+#!/usr/bin/perl

+##

+##  Copyright (c) 2013 The WebM project authors. All Rights Reserved.

+##

+##  Use of this source code is governed by a BSD-style license

+##  that can be found in the LICENSE file in the root of the source

+##  tree. An additional intellectual property rights grant can be found

+##  in the file PATENTS.  All contributing project authors may

+##  be found in the AUTHORS file in the root of the source tree.

+##

+

+use FindBin;

+use lib $FindBin::Bin;

+use thumb;

+

+print "; This file was created from a .asm file\n";

+print ";  using the ads2armasm_ms.pl script.\n";

+

+while (<STDIN>)

+{

+    undef $comment;

+    undef $line;

+

+    s/REQUIRE8//;

+    s/PRESERVE8//;

+    s/^\s*ARM\s*$//;

+    s/AREA\s+\|\|(.*)\|\|/AREA |$1|/;

+    s/qsubaddx/qsax/i;

+    s/qaddsubx/qasx/i;

+

+    thumb::FixThumbInstructions($_);

+

+    s/ldrneb/ldrbne/i;

+    s/ldrneh/ldrhne/i;

+

+    print;

+}

+

-- 

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