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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.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
#
use FindBin;
use lib $FindBin::Bin;
use thumb;
my $thumb = 0;
my $elf = 1;
foreach my $arg (@ARGV) {
$thumb = 1 if ($arg eq "-thumb");
$elf = 0 if ($arg eq "-noelf");
}
print "@ This file was created from a .asm file\n";
print "@ using the ads2gas.pl script.\n";
print ".syntax unified\n";
if ($thumb) {
print "\t.thumb\n";
}
# Stack of procedure names.
@proc_stack = ();
while (<STDIN>)
{
# Load and store alignment
s/@/,:/g;
# Comment character
s/;/@/;
# Convert ELSE to .else
s/\bELSE\b/.else/g;
# Convert ENDIF to .endif
s/\bENDIF\b/.endif/g;
# Convert IF to .if
if (s/\bIF\b/.if/g) {
s/=+/==/g;
}
# Convert INCLUDE to .INCLUDE "file"
s/INCLUDE\s?(.*)$/.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$1.p2align 2/;
# Make function visible to linker.
if ($elf) {
s/(\s*)EXPORT\s+\|([\$\w]*)\|/$1.global $2\n$1.type $2, function/;
} else {
s/(\s*)EXPORT\s+\|([\$\w]*)\|/$1.global $2/;
}
# No vertical bars on function names
s/^\|(\$?\w+)\|/$1/g;
# Labels need trailing colon
s/^([a-zA-Z_0-9\$]+)/$1:/ if !/EQU/;
# ALIGN directive
s/\bALIGN\b/.balign/g;
if ($thumb) {
# ARM code - we force everything to thumb with the declaration in the
# header
s/\bARM\b//g;
} else {
# ARM code
s/\bARM\b/.arm/g;
}
# push/pop
s/(push\s+)(r\d+)/stmdb sp\!, \{$2\}/g;
s/(pop\s+)(r\d+)/ldmia sp\!, \{$2\}/g;
if ($thumb) {
thumb::FixThumbInstructions($_);
}
# eabi_attributes numerical equivalents can be found in the
# "ARM IHI 0045C" document.
if ($elf) {
# REQUIRE8 Stack is required to be 8-byte aligned
s/\bREQUIRE8\b/.eabi_attribute 24, 1 \@Tag_ABI_align_needed/g;
# PRESERVE8 Stack 8-byte align is preserved
s/\bPRESERVE8\b/.eabi_attribute 25, 1 \@Tag_ABI_align_preserved/g;
} else {
s/\bREQUIRE8\b//;
s/\bPRESERVE8\b//;
}
# Use PROC and ENDP to give the symbols a .size directive.
# This makes them show up properly in debugging tools like gdb and valgrind.
if (/\bPROC\b/) {
my $proc;
# Match the function name so it can be stored in $proc
/^([\.0-9A-Z_a-z]\w+)\b/;
$proc = $1;
push(@proc_stack, $proc) if ($proc);
s/\bPROC\b/@ $&/;
}
if (/\bENDP\b/) {
my $proc;
s/\bENDP\b/@ $&/;
$proc = pop(@proc_stack);
$_ = ".size $proc, .-$proc".$_ if ($proc and $elf);
}
# 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;
}
# Mark that this object doesn't need an executable stack.
printf (" .section .note.GNU-stack,\"\",\%\%progbits\n") if $elf;
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