1 #!/usr/bin/env 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_apple.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_apple.pl > outputfile 19 # 20 21 print "@ This file was created from a .asm file\n"; 22 print "@ using the ads2gas_apple.pl script.\n\n"; 23 print "\t.set WIDE_REFERENCE, 0\n"; 24 print "\t.set ARCHITECTURE, 5\n"; 25 print "\t.set DO1STROUNDING, 0\n"; 26 27 my %register_aliases; 28 my %macro_aliases; 29 30 my @mapping_list = ("\$0", "\$1", "\$2", "\$3", "\$4", "\$5", "\$6", "\$7", "\$8", "\$9"); 31 32 my @incoming_array; 33 34 my @imported_functions; 35 36 # Perl trim function to remove whitespace from the start and end of the string 37 sub trim($) 38 { 39 my $string = shift; 40 $string =~ s/^\s+//; 41 $string =~ s/\s+$//; 42 return $string; 43 } 44 45 while (<STDIN>) 46 { 47 # Load and store alignment 48 s/@/,:/g; 49 50 # Comment character 51 s/;/ @/g; 52 53 # Hexadecimal constants prefaced by 0x 54 s/#&/#0x/g; 55 56 # Convert :OR: to | 57 s/:OR:/ | /g; 58 59 # Convert :AND: to & 60 s/:AND:/ & /g; 61 62 # Convert :NOT: to ~ 63 s/:NOT:/ ~ /g; 64 65 # Convert :SHL: to << 66 s/:SHL:/ << /g; 67 68 # Convert :SHR: to >> 69 s/:SHR:/ >> /g; 70 71 # Convert ELSE to .else 72 s/\bELSE\b/.else/g; 73 74 # Convert ENDIF to .endif 75 s/\bENDIF\b/.endif/g; 76 77 # Convert ELSEIF to .elseif 78 s/\bELSEIF\b/.elseif/g; 79 80 # Convert LTORG to .ltorg 81 s/\bLTORG\b/.ltorg/g; 82 83 # Convert IF :DEF:to .if 84 # gcc doesn't have the ability to do a conditional 85 # if defined variable that is set by IF :DEF: on 86 # armasm, so convert it to a normal .if and then 87 # make sure to define a value elesewhere 88 if (s/\bIF :DEF:\b/.if /g) 89 { 90 s/=/==/g; 91 } 92 93 # Convert IF to .if 94 if (s/\bIF\b/.if/g) 95 { 96 s/=/==/g; 97 } 98 99 # Convert INCLUDE to .INCLUDE "file" 100 s/INCLUDE(\s*)(.*)$/.include $1\"$2\"/; 101 102 # Code directive (ARM vs Thumb) 103 s/CODE([0-9][0-9])/.code $1/; 104 105 # No AREA required 106 # But ALIGNs in AREA must be obeyed 107 s/^\s*AREA.*ALIGN=([0-9])$/.text\n.p2align $1/; 108 # If no ALIGN, strip the AREA and align to 4 bytes 109 s/^\s*AREA.*$/.text\n.p2align 2/; 110 111 # DCD to .word 112 # This one is for incoming symbols 113 s/DCD\s+\|(\w*)\|/.long $1/; 114 115 # DCW to .short 116 s/DCW\s+\|(\w*)\|/.short $1/; 117 s/DCW(.*)/.short $1/; 118 119 # Constants defined in scope 120 s/DCD(.*)/.long $1/; 121 s/DCB(.*)/.byte $1/; 122 123 # Make function visible to linker, and make additional symbol with 124 # prepended underscore 125 s/EXPORT\s+\|([\$\w]*)\|/.globl _$1\n\t.globl $1/; 126 127 # Prepend imported functions with _ 128 if (s/IMPORT\s+\|([\$\w]*)\|/.globl $1/) 129 { 130 $function = trim($1); 131 push(@imported_functions, $function); 132 } 133 134 foreach $function (@imported_functions) 135 { 136 s/$function/_$function/; 137 } 138 139 # No vertical bars required; make additional symbol with prepended 140 # underscore 141 s/^\|(\$?\w+)\|/_$1\n\t$1:/g; 142 143 # Labels need trailing colon 144 # s/^(\w+)/$1:/ if !/EQU/; 145 # put the colon at the end of the line in the macro 146 s/^([a-zA-Z_0-9\$]+)/$1:/ if !/EQU/; 147 148 # ALIGN directive 149 s/\bALIGN\b/.balign/g; 150 151 # Strip ARM 152 s/\sARM/@ ARM/g; 153 154 # Strip REQUIRE8 155 #s/\sREQUIRE8/@ REQUIRE8/g; 156 s/\sREQUIRE8/@ /g; 157 158 # Strip PRESERVE8 159 s/\sPRESERVE8/@ PRESERVE8/g; 160 161 # Strip PROC and ENDPROC 162 s/\bPROC\b/@/g; 163 s/\bENDP\b/@/g; 164 165 # EQU directive 166 s/(.*)EQU(.*)/.set $1, $2/; 167 168 # Begin macro definition 169 if (/\bMACRO\b/) 170 { 171 # Process next line down, which will be the macro definition 172 $_ = <STDIN>; 173 174 $trimmed = trim($_); 175 176 # remove commas that are separating list 177 $trimmed =~ s/,//g; 178 179 # string to array 180 @incoming_array = split(/\s+/, $trimmed); 181 182 print ".macro @incoming_array[0]\n"; 183 184 # remove the first element, as that is the name of the macro 185 shift (@incoming_array); 186 187 @macro_aliases{@incoming_array} = @mapping_list; 188 189 next; 190 } 191 192 while (($key, $value) = each(%macro_aliases)) 193 { 194 $key =~ s/\$/\\\$/; 195 s/$key\b/$value/g; 196 } 197 198 # For macros, use \ to reference formal params 199 # s/\$/\\/g; # End macro definition 200 s/\bMEND\b/.endm/; # No need to tell it where to stop assembling 201 next if /^\s*END\s*$/; 202 203 print; 204 } 205
