build/make/ads2gas.pl

   1 #!/usr/bin/perl
   2 ##
   3 ##  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   4 ##
   5 ##  Use of this source code is governed by a BSD-style license
   6 ##  that can be found in the LICENSE file in the root of the source
   7 ##  tree. An additional intellectual property rights grant can be found
   8 ##  in the file PATENTS.  All contributing project authors may
   9 ##  be found in the AUTHORS file in the root of the source tree.
  10 ##
  11
  12
  13 # ads2gas.pl
  14 # Author: Eric Fung (efung (at) acm.org)
  15 #
  16 # Convert ARM Developer Suite 1.0.1 syntax assembly source to GNU as format
  17 #
  18 # Usage: cat inputfile | perl ads2gas.pl > outputfile
  19 #
  20 print "@ This file was created from a .asm file\n";
  21 print "@  using the ads2gas.pl script.\n";
  22 print "\t.equ DO1STROUNDING, 0\n";
  23
  24 while (<STDIN>)
  25 {
  26     # Comment character
  27     s/;/@/g;
  28
  29     # Hexadecimal constants prefaced by 0x
  30     s/#&/#0x/g;
  31
  32     # Convert :OR: to |
  33     s/:OR:/ | /g;
  34
  35     # Convert :AND: to &
  36     s/:AND:/ & /g;
  37
  38     # Convert :NOT: to ~
  39     s/:NOT:/ ~ /g;
  40
  41     # Convert :SHL: to <<
  42     s/:SHL:/ << /g;
  43
  44     # Convert :SHR: to >>
  45     s/:SHR:/ >> /g;
  46
  47     # Convert ELSE to .else
  48     s/ELSE/.else/g;
  49
  50     # Convert ENDIF to .endif
  51     s/ENDIF/.endif/g;
  52
  53     # Convert ELSEIF to .elseif
  54     s/ELSEIF/.elseif/g;
  55
  56     # Convert LTORG to .ltorg
  57     s/LTORG/.ltorg/g;
  58
  59     # Convert IF :DEF:to .if
  60     # gcc doesn't have the ability to do a conditional
  61     # if defined variable that is set by IF :DEF: on
  62     # armasm, so convert it to a normal .if and then
  63     # make sure to define a value elesewhere
  64     if (s/\bIF :DEF:\b/.if /g)
  65     {
  66         s/=/==/g;
  67     }
  68
  69     # Convert IF to .if
  70     if (s/\bIF\b/.if/g)
  71     {
  72         s/=+/==/g;
  73     }
  74
  75     # Convert INCLUDE to .INCLUDE "file"
  76     s/INCLUDE(\s*)(.*)$/.include $1\"$2\"/;
  77
  78     # Code directive (ARM vs Thumb)
  79     s/CODE([0-9][0-9])/.code $1/;
  80
  81     # No AREA required
  82     s/^\s*AREA.*$/.text/;
  83
  84     # DCD to .word
  85     # This one is for incoming symbols
  86     s/DCD\s+\|(\w*)\|/.long $1/;
  87
  88     # DCW to .short
  89     s/DCW\s+\|(\w*)\|/.short $1/;
  90     s/DCW(.*)/.short $1/;
  91
  92     # Constants defined in scope
  93     s/DCD(.*)/.long $1/;
  94     s/DCB(.*)/.byte $1/;
  95
  96     # RN to .req
  97     if (s/RN\s+([Rr]\d+|lr)/.req $1/)
  98     {
  99         print;
 100         next;
 101     }
 102
 103     # Make function visible to linker, and make additional symbol with
 104     # prepended underscore
 105     s/EXPORT\s+\|([\$\w]*)\|/.global $1 \n\t.type $1, function/;
 106     s/IMPORT\s+\|([\$\w]*)\|/.global $1/;
 107
 108     # No vertical bars required; make additional symbol with prepended
 109     # underscore
 110     s/^\|(\$?\w+)\|/_$1\n\t$1:/g;
 111
 112     # Labels need trailing colon
 113 #   s/^(\w+)/$1:/ if !/EQU/;
 114     # put the colon at the end of the line in the macro
 115     s/^([a-zA-Z_0-9\$]+)/$1:/ if !/EQU/;
 116
 117     # Strip ALIGN
 118     s/\sALIGN/@ ALIGN/g;
 119
 120     # Strip ARM
 121     s/\sARM/@ ARM/g;
 122
 123     # Strip REQUIRE8
 124     #s/\sREQUIRE8/@ REQUIRE8/g;
 125     s/\sREQUIRE8/@ /g;      #EQU cause problem
 126
 127     # Strip PRESERVE8
 128     s/\sPRESERVE8/@ PRESERVE8/g;
 129
 130     # Strip PROC and ENDPROC
 131     s/\sPROC/@/g;
 132     s/\sENDP/@/g;
 133
 134     # EQU directive
 135     s/(.*)EQU(.*)/.equ $1, $2/;
 136
 137     # Begin macro definition
 138     if (/MACRO/) {
 139         $_ = <STDIN>;
 140         s/^/.macro/;
 141         s/\$//g;                # remove formal param reference
 142         s/;/@/g;                # change comment characters
 143     }
 144
 145     # For macros, use \ to reference formal params
 146     s/\$/\\/g;                  # End macro definition
 147     s/MEND/.endm/;              # No need to tell it where to stop assembling
 148     next if /^\s*END\s*$/;
 149     print;
 150 }