1#!/usr/bin/perl 2# -*- perl -*- 3# 4# Toshiba MeP Media Engine Relocation Generator 5# Copyright (C) 2001, 2007 Free Software Foundation, Inc. 6# This file is part of BFD. 7# Originally written by DJ Delorie <dj@redhat.com> 8# 9# This program is free software; you can redistribute it and/or modify 10# it under the terms of the GNU General Public License as published by 11# the Free Software Foundation; either version 2 of the License, or 12# (at your option) any later version. 13# 14# This program is distributed in the hope that it will be useful, 15# but WITHOUT ANY WARRANTY; without even the implied warranty of 16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17# GNU General Public License for more details. 18# 19# You should have received a copy of the GNU General Public License 20# along with this program; if not, write to the Free Software 21# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23 24# Usage: Run this anywhere inside your source tree. It will read 25# include/elf/mep.h and scan the comments therein. It will renumber 26# the relocs to be sequential (this is needed so that bfd/elf32-mep.h 27# works) if needed. It will then update the reloc list in bfd/reloc.c 28# and the howto, mapping, and apply routines in bfd/elf32-mep.c. You 29# can then regenerate bfd-in2.h and check everything in. 30 31# FIXME: After the relocation list is finalized, change this to 32# *verify* the reloc list, rather than resequence it. 33 34while (! -f "include/elf/mep.h" && ! -f "bfd/reloc.c") { 35 chdir ".."; 36 $pwd = `pwd`; 37 if ($pwd !~ m@/.*/@) { 38 print STDERR "Cannot find include/elf/mep.h or bfd/reloc.h\n"; 39 exit 1; 40 } 41} 42$pwd = `pwd`; 43print "srctop is $pwd"; 44 45printf "Reading include/elf/mep.h ...\n"; 46open(MEPH, "include/elf/mep.h"); 47open(MEPHO, "> include/elf/mep.h.new") || die("mep.h.new create: $!"); 48$val = 0; 49while (<MEPH>) { 50 if (($pre,$rel,$rest) = /(.*RELOC_NUMBER \()([^,]+), *\d+(.*)/) { 51 $rest =~ s/[\r\n]+$//; 52 print (MEPHO "$pre$rel, $val$rest\n") || die("mep.h.new write: $!"); 53 $val ++; 54 $rel =~ s/R_MEP_//; 55 push(@relocs, $rel); 56 57 $rest =~ s@.*/\* @@; 58 ($pattern, $sign, $attrs) = $rest =~ m@(.*) ([US]) (.*)\*/@; 59 $pattern =~ s/ //g; 60 push(@pattern, $pattern); 61 push(@sign, $sign); 62 push(@attrs, $attrs); 63 64 printf "%4d $rel p=`$pattern' s=`$sign' a=`$attrs'\n", $#pattern; 65 66 } else { 67 print(MEPHO) || die("mep.h.new write: $!"); 68 } 69} 70close(MEPH); 71close(MEPHO) || die("mep.h.new close: $!"); 72 73&swapfile("include/elf/mep.h"); 74 75redo_file ("bfd/reloc.c", 76 "", 77 "ENUMDOC\n Toshiba Media Processor Relocations.\n\nCOMMENT\n", 78 "ENUM\n BFD_RELOC_MEP_%s\n", 79 ""); 80 81$autogen = " /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h. */\n"; 82 83redo_file ("bfd/elf32-mep.c", 84 "MEPRELOC:HOWTO", 85 $autogen, 86 "MEPRELOC:END", 87 "", 88 "&emit_howto();", 89 "MEPRELOC:MAP", 90 $autogen, 91 "MEPRELOC:END", 92 "", 93 " MAP(%s);\n", 94 "MEPRELOC:APPLY", 95 $autogen, 96 "MEPRELOC:END", 97 "", 98 "&emit_apply();", 99 ); 100 101sub mask2shifts { 102 my ($mask) = @_; 103 my ($bits, $left, $right, $ci, $c, $cv); 104 $bits = 0; 105 $left = 0; 106 $right = 32; 107 for ($ci=0; $ci<length($mask); $ci++) { 108 $c = substr($mask, $ci, 1); 109 $left++; 110 next if $c eq '-'; 111 $left = 0; 112 $cv = ord($c) - ord('0'); 113 $cv -= ord('a') - ord('9') - 1 if $cv > 9; 114 $right = $cv unless $right < $cv; 115 $bits = $cv+1 unless $bits > $cv+1; 116 } 117 $mask =~ tr/-/1/c; 118 $mask =~ tr/-/0/; 119 ($rmask = $mask) =~ tr/01/10/; 120 $mask = unpack("H*", pack("B*", $mask)); 121 $rmask = unpack("H*", pack("B*", $rmask)); 122 return ($bits, $left, $right, $mask, $rmask); 123} 124 125sub emit_howto { 126 for ($i=2; $i<=$#relocs; $i++) { 127 $mask = $pattern[$i]; 128 129 if (length($mask) == 8) { $bytesize = 0; } 130 elsif (length($mask) == 16) { $bytesize = 1; } 131 elsif (length($mask) == 32) { $bytesize = 2; } 132 133 ($bits, $left, $right, $mask) = mask2shifts ($mask); 134 $bits[$i] = $bits; 135 $pcrel = 0; 136 $pcrel = 1 if $attrs[$i] =~ /pc-rel/i; 137 $overflow = $sign[$i]; 138 $overflow = 'N' if $attrs[$i] =~ /no-overflow/; 139 140 $c = "$relocs[$i],"; 141 printf(NEW " MEPREL (R_MEP_%-10s%d,%3d,%2d,%2d,%2d,%2s, 0x%s),\n", 142 $c, $bytesize, $bits, $left, $right, $pcrel, $overflow, $mask); 143 } 144} 145 146sub emit_apply { 147 for ($i=2; $i<=$#relocs; $i++) { 148 $v = "u"; 149 $v = "s" if $sign[$i] =~ /S/; 150 if (length($pattern[$i]) == 8) { 151 $e = ''; # no endian swap for bytes 152 } elsif ($pattern[$i] =~ /-/ || length($pattern[$i]) == 16) { 153 $e = '^e2'; # endian swap - 2byte words only 154 } else { 155 $e = '^e4' # endian swap for data 156 } 157 print NEW " case R_MEP_$relocs[$i]: /* $pattern[$i] */\n"; 158 if ($attrs[$i] =~ /tp-rel/i) { 159 print NEW " $v -= mep_tpoff_base(rel->r_offset);\n"; 160 } 161 if ($attrs[$i] =~ /gp-rel/i) { 162 print NEW " $v -= mep_sdaoff_base(rel->r_offset);\n"; 163 } 164 if ($attrs[$i] !~ /no-overflow/ && $bits[$i] < 32) { 165 if ($v eq "u") { 166 $max = (1 << $bits[$i]) - 1; 167 print NEW " if (u > $max) r = bfd_reloc_overflow;\n"; 168 } else { 169 $min = -(1 << ($bits[$i]-1)); 170 $max = (1 << ($bits[$i]-1)) - 1; 171 print NEW " if ($min > s || s > $max) r = bfd_reloc_overflow;\n"; 172 } 173 } 174 for ($b=0; $b<length($pattern[$i]); $b += 8) { 175 $mask = substr($pattern[$i], $b, 8); 176 ($bits, $left, $right, $mask, $rmask) = mask2shifts ($mask); 177 if ($left > $right) { $left -= $right; $right = 0; } 178 else { $right -= $left; $left = 0; } 179 180 if ($mask ne "00") { 181 $bb = $b / 8; 182 print NEW " byte[$bb$e] = "; 183 print NEW "(byte[$bb$e] & 0x$rmask) | " if $rmask ne "00"; 184 if ($left) { 185 print NEW "(($v << $left) & 0x$mask)"; 186 } elsif ($right) { 187 print NEW "(($v >> $right) & 0x$mask)"; 188 } else { 189 print NEW "($v & 0x$mask)"; 190 } 191 print NEW ";\n"; 192 } 193 } 194 print NEW " break;\n"; 195 } 196} 197 198 199#----------------------------------------------------------------------------- 200 201sub redo_file { 202 my ($file, @control) = @_; 203 open(OLD, $file); 204 open(NEW, "> $file.new") || die("$file.new create: $!"); 205 206 print "Scanning file $file ...\n"; 207 208 while (1) { 209 $start = shift @control; 210 $prefix = shift @control; 211 $end = shift @control; 212 $suffix = shift @control; 213 $pattern = shift @control; 214 215 if (!$start) { 216 print NEW while <OLD>; 217 last; 218 } 219 220 print " looking for $start\n"; 221 while (<OLD>) { 222 print NEW; 223 last if /\Q$start\E/; 224 } 225 print "can't find $start\n" unless $_; 226 last unless $_; 227 228 print NEW $prefix; 229 if ($pattern =~ /^\&/) { 230 eval $pattern; 231 die("$pattern: $@") if $@; 232 } else { 233 for $i (2..$#relocs) { 234 printf (NEW "$pattern", $relocs[$i]) || die("$file.new write: $!"); 235 $pattern =~ s/^ENUM\n/ENUMX\n/; 236 } 237 } 238 print NEW $suffix; 239 while (<OLD>) { 240 last if /\Q$end\E/; 241 } 242 print NEW; 243 } 244 245 close(OLD); 246 close(NEW) || die("$file.new close: $!"); 247 &swapfile($file); 248} 249 250#----------------------------------------------------------------------------- 251 252sub swapfile { 253 my ($f) = @_; 254 if ( ! -f "$f.save") { 255 system "cp $f $f.save"; 256 } 257 open(ORIG, $f); 258 open(NEW, "$f.new"); 259 while (<ORIG>) { 260 $n = <NEW>; 261 if ($n ne $_) { 262 close(ORIG); 263 close(NEW); 264 print " Updating $f\n"; 265 rename "$f", "$f.old"; 266 rename "$f.new", "$f"; 267 return; 268 } 269 } 270 close(ORIG); 271 close(NEW); 272 print " No change to $f\n"; 273 unlink "$f.new"; 274} 275