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#!/usr/bin/perl
##
## Copyright (c) 2010 The VP8 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.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.pl > outputfile
#
print "@ This file was created from a .asm file\n";
print "@ using the ads2gas.pl script.\n";
print "\t.equ DO1STROUNDING, 0\n";
while (<STDIN>)
{
# 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 $1/;
# No AREA required
s/^\s*AREA.*$/.text/;
# 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/;
# RN to .req
if (s/RN\s+([Rr]\d+|lr)/.req $1/)
{
print;
next;
}
# Make function visible to linker, and make additional symbol with
# prepended underscore
s/EXPORT\s+\|([\$\w]*)\|/.global $1 \n\t.type $1, function/;
s/IMPORT\s+\|([\$\w]*)\|/.global $1/;
# 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/;
# Strip ALIGN
s/\sALIGN/@ ALIGN/g;
# Strip ARM
s/\sARM/@ ARM/g;
# Strip REQUIRE8
#s/\sREQUIRE8/@ REQUIRE8/g;
s/\sREQUIRE8/@ /g; #EQU cause problem
# Strip PRESERVE8
s/\sPRESERVE8/@ PRESERVE8/g;
# Strip PROC and ENDPROC
s/\sPROC/@/g;
s/\sENDP/@/g;
# EQU directive
s/(.*)EQU(.*)/.equ $1, $2/;
# Begin macro definition
if (/MACRO/) {
$_ = <STDIN>;
s/^/.macro/;
s/\$//g; # remove formal param reference
s/;/@/g; # change comment characters
}
# For macros, use \ to reference formal params
s/\$/\\/g; # End macro definition
s/MEND/.endm/; # No need to tell it where to stop assembling
next if /^\s*END\s*$/;
print;
}
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