2010-05-18 17:58:33 +02:00
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#!/usr/bin/perl
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##
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2010-09-09 14:16:39 +02:00
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## Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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2010-06-18 18:39:21 +02:00
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##
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## Use of this source code is governed by a BSD-style license
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2010-06-04 22:19:40 +02:00
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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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2010-06-18 18:39:21 +02:00
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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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2010-05-18 17:58:33 +02:00
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##
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# ads2gas.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.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.pl script.\n";
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print "\t.equ DO1STROUNDING, 0\n";
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2011-07-19 21:13:18 +02:00
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# Stack of procedure names.
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@proc_stack = ();
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2010-05-18 17:58:33 +02:00
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while (<STDIN>)
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{
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2011-04-11 11:04:17 +02:00
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# Load and store alignment
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s/@/,:/g;
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2010-05-18 17:58:33 +02:00
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# Comment character
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s/;/@/g;
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# Hexadecimal constants prefaced by 0x
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s/#&/#0x/g;
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# Convert :OR: to |
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s/:OR:/ | /g;
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# Convert :AND: to &
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s/:AND:/ & /g;
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# Convert :NOT: to ~
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s/:NOT:/ ~ /g;
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# Convert :SHL: to <<
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s/:SHL:/ << /g;
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# Convert :SHR: to >>
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s/:SHR:/ >> /g;
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# Convert ELSE to .else
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s/ELSE/.else/g;
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# Convert ENDIF to .endif
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s/ENDIF/.endif/g;
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# Convert ELSEIF to .elseif
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s/ELSEIF/.elseif/g;
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# Convert LTORG to .ltorg
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s/LTORG/.ltorg/g;
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# Convert IF :DEF:to .if
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# gcc doesn't have the ability to do a conditional
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# if defined variable that is set by IF :DEF: on
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# armasm, so convert it to a normal .if and then
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# make sure to define a value elesewhere
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if (s/\bIF :DEF:\b/.if /g)
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{
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s/=/==/g;
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}
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# Convert IF to .if
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if (s/\bIF\b/.if/g)
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{
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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\"$2\"/;
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# Code directive (ARM vs Thumb)
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s/CODE([0-9][0-9])/.code $1/;
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# No AREA required
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2011-06-27 17:38:26 +02:00
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# But ALIGNs in AREA must be obeyed
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s/^\s*AREA.*ALIGN=([0-9])$/.text\n.p2align $1/;
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# If no ALIGN, strip the AREA and align to 4 bytes
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s/^\s*AREA.*$/.text\n.p2align 2/;
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2010-05-18 17:58:33 +02:00
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# DCD to .word
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# This one is for incoming symbols
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s/DCD\s+\|(\w*)\|/.long $1/;
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# DCW to .short
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s/DCW\s+\|(\w*)\|/.short $1/;
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s/DCW(.*)/.short $1/;
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# Constants defined in scope
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s/DCD(.*)/.long $1/;
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s/DCB(.*)/.byte $1/;
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# RN to .req
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if (s/RN\s+([Rr]\d+|lr)/.req $1/)
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{
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print;
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next;
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}
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# Make function visible to linker, and make additional symbol with
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# prepended underscore
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s/EXPORT\s+\|([\$\w]*)\|/.global $1 \n\t.type $1, function/;
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s/IMPORT\s+\|([\$\w]*)\|/.global $1/;
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# No vertical bars required; make additional symbol with prepended
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# underscore
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s/^\|(\$?\w+)\|/_$1\n\t$1:/g;
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# Labels need trailing colon
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# s/^(\w+)/$1:/ if !/EQU/;
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# put the colon at the end of the line in the macro
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s/^([a-zA-Z_0-9\$]+)/$1:/ if !/EQU/;
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2011-04-11 11:04:17 +02:00
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# ALIGN directive
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s/ALIGN/.balign/g;
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2010-05-18 17:58:33 +02:00
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2011-11-18 11:28:43 +01:00
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# ARM code
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s/\sARM/.arm/g;
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2010-05-18 17:58:33 +02:00
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2011-11-18 11:28:43 +01:00
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# REQUIRE8 Stack is required to be 8-byte aligned
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s/\sREQUIRE8/.eabi_attribute Tag_ABI_align_needed, 1/g;
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2010-05-18 17:58:33 +02:00
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2011-11-18 11:28:43 +01:00
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# PRESERVE8 Stack 8-byte align is preserved
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s/\sPRESERVE8/.eabi_attribute Tag_ABI_align_preserved, 1/g;
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2010-05-18 17:58:33 +02:00
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2011-07-19 21:13:18 +02:00
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# Use PROC and ENDP to give the symbols a .size directive.
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# This makes them show up properly in debugging tools like gdb and valgrind.
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if (/\bPROC\b/)
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{
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my $proc;
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/^_([\.0-9A-Z_a-z]\w+)\b/;
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$proc = $1;
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push(@proc_stack, $proc) if ($proc);
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s/\bPROC\b/@ $&/;
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}
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if (/\bENDP\b/)
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{
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my $proc;
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s/\bENDP\b/@ $&/;
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$proc = pop(@proc_stack);
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$_ = "\t.size $proc, .-$proc".$_ if ($proc);
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}
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2010-05-18 17:58:33 +02:00
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# EQU directive
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s/(.*)EQU(.*)/.equ $1, $2/;
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# Begin macro definition
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if (/MACRO/) {
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$_ = <STDIN>;
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s/^/.macro/;
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s/\$//g; # remove formal param reference
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s/;/@/g; # change comment characters
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}
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# For macros, use \ to reference formal params
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s/\$/\\/g; # End macro definition
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s/MEND/.endm/; # No need to tell it where to stop assembling
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next if /^\s*END\s*$/;
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print;
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}
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2011-07-19 22:09:22 +02:00
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# Mark that this object doesn't need an executable stack.
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printf ("\t.section\t.note.GNU-stack,\"\",\%\%progbits\n");
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