bfd/mep-relocs.pl

   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
  34 while (! -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`;
  43 print "srctop is $pwd";
  44
  45 printf "Reading include/elf/mep.h ...\n";
  46 open(MEPH, "include/elf/mep.h");
  47 open(MEPHO, "> include/elf/mep.h.new") || die("mep.h.new create: $!");
  48 $val = 0;
  49 while (<MEPH>) {
  50     if (($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 }
  70 close(MEPH);
  71 close(MEPHO) || die("mep.h.new close: $!");
  72
  73 &swapfile("include/elf/mep.h");
  74
  75 redo_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
  83 redo_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            $autogen,
  96            "MEPRELOC:END",
  97            "",
  98            "&emit_apply();",
  99            );
 100
 101 sub mask2shifts {
 102     my ($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, $rmask);
 123 }
 124
 125 sub emit_howto {
 126     for ($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, $mask);
 143     }
 144 }
 145
 146 sub emit_apply {
 147     for ($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
 201 sub 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
 252 sub 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 }