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