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#!/usr/bin/env perl
##
## Copyright (c) 2010 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.
##
# ads2gas_apple.pl
# Author: Eric Fung (efung (at) acm.org)
#
# Convert ARM Developer Suite 1.0.1 syntax assembly source to GNU as format
#
# Usage: cat inputfile | perl ads2gas_apple.pl > outputfile
#
print "@ This file was created from a .asm file\n";
print "@ using the ads2gas_apple.pl script.\n\n";
print ".syntax unified\n";
my %macro_aliases;
my @mapping_list = ("\$0", "\$1", "\$2", "\$3", "\$4", "\$5", "\$6", "\$7", "\$8", "\$9");
my @incoming_array;
# Perl trim function to remove whitespace from the start and end of the string
sub trim($)
{
my $string = shift;
$string =~ s/^\s+//;
$string =~ s/\s+$//;
return $string;
}
while (<STDIN>)
{
# Load and store alignment
s/@/,:/g;
# Comment character
s/;/@/;
# Convert ELSE to .else
s/\bELSE\b/.else/g;
# Convert ENDIF to .endif
s/\bENDIF\b/.endif/g;
# Convert IF to .if
if (s/\bIF\b/.if/g) {
s/=+/==/g;
}
# Convert INCLUDE to .INCLUDE "file"
s/INCLUDE\s?(.*)$/.include \"$1\"/;
# No AREA required
# But ALIGNs in AREA must be obeyed
s/^(\s*)\bAREA\b.*ALIGN=([0-9])$/$1.text\n$1.p2align $2/;
# If no ALIGN, strip the AREA and align to 4 bytes
s/^(\s*)\bAREA\b.*$/$1.text\n$1.p2align 2/;
# Make function visible to linker.
s/EXPORT\s+\|([\$\w]*)\|/.globl _$1/;
# No vertical bars on function names
s/^\|(\$?\w+)\|/$1/g;
# Labels and functions need a leading underscore and trailing colon
s/^([a-zA-Z_0-9\$]+)/_$1:/ if !/EQU/;
# Branches need to call the correct, underscored, function
s/^(\s+b[egln]?[teq]?\s+)([a-zA-Z_0-9\$]+)/$1 _$2/ if !/EQU/;
# ALIGN directive
s/\bALIGN\b/.balign/g;
# Strip ARM
s/\s+ARM//;
# Strip REQUIRE8
s/\s+REQUIRE8//;
# Strip PRESERVE8
s/\s+PRESERVE8//;
# Strip PROC and ENDPROC
s/\bPROC\b//g;
s/\bENDP\b//g;
# EQU directive
s/(\S+\s+)EQU(\s+\S+)/.equ $1, $2/;
# Begin macro definition
if (/\bMACRO\b/) {
# Process next line down, which will be the macro definition
$_ = <STDIN>;
s/^/.macro/;
s/\$//g; # Remove $ from the variables in the declaration
}
s/\$/\\/g; # Use \ to reference formal parameters
# End macro definition
s/\bMEND\b/.endm/; # No need to tell it where to stop assembling
next if /^\s*END\s*$/;
s/[ \t]+$//;
print;
}
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