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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 "\t.set WIDE_REFERENCE, 0\n";
print "\t.set ARCHITECTURE, 5\n";
print "\t.set DO1STROUNDING, 0\n";
my %register_aliases;
my %macro_aliases;
my @mapping_list = ("\$0", "\$1", "\$2", "\$3", "\$4", "\$5", "\$6", "\$7", "\$8", "\$9");
my @incoming_array;
my @imported_functions;
# 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 $string;
}
while (<STDIN>)
{
# Load and store alignment
s/@/,:/g;
# Comment character
s/;/@/g;
# Hexadecimal constants prefaced by 0x
s/#&/#0x/g;
# Convert :OR: to |
s/:OR:/ | /g;
# Convert :AND: to &
s/:AND:/ & /g;
# Convert :NOT: to ~
s/:NOT:/ ~ /g;
# Convert :SHL: to <<
s/:SHL:/ << /g;
# Convert :SHR: to >>
s/:SHR:/ >> /g;
# Convert ELSE to .else
s/ELSE/.else/g;
# Convert ENDIF to .endif
s/ENDIF/.endif/g;
# Convert ELSEIF to .elseif
s/ELSEIF/.elseif/g;
# Convert LTORG to .ltorg
s/LTORG/.ltorg/g;
# Convert IF :DEF:to .if
# gcc doesn't have the ability to do a conditional
# if defined variable that is set by IF :DEF: on
# armasm, so convert it to a normal .if and then
# make sure to define a value elesewhere
if (s/\bIF :DEF:\b/.if /g)
{
s/=/==/g;
}
# Convert IF to .if
if (s/\bIF\b/.if/g)
{
s/=/==/g;
}
# Convert INCLUDE to .INCLUDE "file"
s/INCLUDE(\s*)(.*)$/.include $1\"$2\"/;
# Code directive (ARM vs Thumb)
s/CODE([0-9][0-9])/.code $1/;
# No AREA required
# But ALIGNs in AREA must be obeyed
s/^\s*AREA.*ALIGN=([0-9])$/.text\n.p2align $1/;
# If no ALIGN, strip the AREA and align to 4 bytes
s/^\s*AREA.*$/.text\n.p2align 2/;
# DCD to .word
# This one is for incoming symbols
s/DCD\s+\|(\w*)\|/.long $1/;
# DCW to .short
s/DCW\s+\|(\w*)\|/.short $1/;
s/DCW(.*)/.short $1/;
# Constants defined in scope
s/DCD(.*)/.long $1/;
s/DCB(.*)/.byte $1/;
# Build a hash of all the register - alias pairs.
if (s/(.*)RN(.*)/$1 .req $2/g)
{
$register_aliases{trim($1)} = trim($2);
next;
}
while (($key, $value) = each(%register_aliases))
{
s/\b$key\b/$value/g;
}
# Make function visible to linker, and make additional symbol with
# prepended underscore
s/EXPORT\s+\|([\$\w]*)\|/.globl _$1\n\t.globl $1/;
# Prepend imported functions with _
if (s/IMPORT\s+\|([\$\w]*)\|/.globl $1/)
{
$function = trim($1);
push(@imported_functions, $function);
}
foreach $function (@imported_functions)
{
s/$function/_$function/;
}
# No vertical bars required; make additional symbol with prepended
# underscore
s/^\|(\$?\w+)\|/_$1\n\t$1:/g;
# Labels need trailing colon
# s/^(\w+)/$1:/ if !/EQU/;
# put the colon at the end of the line in the macro
s/^([a-zA-Z_0-9\$]+)/$1:/ if !/EQU/;
# ALIGN directive
s/ALIGN/.balign/g;
# Strip ARM
s/\sARM/@ ARM/g;
# Strip REQUIRE8
#s/\sREQUIRE8/@ REQUIRE8/g;
s/\sREQUIRE8/@ /g;
# Strip PRESERVE8
s/\sPRESERVE8/@ PRESERVE8/g;
# Strip PROC and ENDPROC
s/\bPROC\b/@/g;
s/\bENDP\b/@/g;
# EQU directive
s/(.*)EQU(.*)/.set $1, $2/;
# Begin macro definition
if (/MACRO/)
{
# Process next line down, which will be the macro definition
$_ = <STDIN>;
$trimmed = trim($_);
# remove commas that are separating list
$trimmed =~ s/,//g;
# string to array
@incoming_array = split(/\s+/, $trimmed);
print ".macro @incoming_array[0]\n";
# remove the first element, as that is the name of the macro
shift (@incoming_array);
@macro_aliases{@incoming_array} = @mapping_list;
next;
}
while (($key, $value) = each(%macro_aliases))
{
$key =~ s/\$/\\\$/;
s/$key\b/$value/g;
}
# For macros, use \ to reference formal params
# s/\$/\\/g; # End macro definition
s/MEND/.endm/; # No need to tell it where to stop assembling
next if /^\s*END\s*$/;
print;
}
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