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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [bfd/] [mep-relocs.pl] - Blame information for rev 301

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1 24 jeremybenn
#!/usr/bin/perl
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# -*- perl -*-
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#
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# Toshiba MeP Media Engine Relocation Generator
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# Copyright (C) 2001, 2007 Free Software Foundation, Inc.
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# This file is part of BFD.
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# Originally written by DJ Delorie <dj@redhat.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# 
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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# 
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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# Usage: Run this anywhere inside your source tree.  It will read
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# include/elf/mep.h and scan the comments therein.  It will renumber
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# the relocs to be sequential (this is needed so that bfd/elf32-mep.h
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# works) if needed.  It will then update the reloc list in bfd/reloc.c
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# and the howto, mapping, and apply routines in bfd/elf32-mep.c.  You
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# can then regenerate bfd-in2.h and check everything in.
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# FIXME: After the relocation list is finalized, change this to
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# *verify* the reloc list, rather than resequence it.
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while (! -f "include/elf/mep.h" && ! -f "bfd/reloc.c") {
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    chdir "..";
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    $pwd = `pwd`;
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    if ($pwd !~ m@/.*/@) {
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        print STDERR "Cannot find include/elf/mep.h or bfd/reloc.h\n";
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        exit 1;
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    }
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}
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$pwd = `pwd`;
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print "srctop is $pwd";
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printf "Reading include/elf/mep.h ...\n";
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open(MEPH, "include/elf/mep.h");
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open(MEPHO, "> include/elf/mep.h.new") || die("mep.h.new create: $!");
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$val = 0;
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while (<MEPH>) {
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    if (($pre,$rel,$rest) = /(.*RELOC_NUMBER \()([^,]+), *\d+(.*)/) {
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        $rest =~ s/[\r\n]+$//;
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        print (MEPHO "$pre$rel, $val$rest\n") || die("mep.h.new write: $!");
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        $val ++;
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        $rel =~ s/R_MEP_//;
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        push(@relocs, $rel);
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        $rest =~ s@.*/\* @@;
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        ($pattern, $sign, $attrs) = $rest =~ m@(.*) ([US]) (.*)\*/@;
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        $pattern =~ s/ //g;
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        push(@pattern, $pattern);
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        push(@sign, $sign);
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        push(@attrs, $attrs);
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        printf "%4d $rel p=`$pattern' s=`$sign' a=`$attrs'\n", $#pattern;
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    } else {
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        print(MEPHO) || die("mep.h.new write: $!");
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    }
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}
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close(MEPH);
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close(MEPHO) || die("mep.h.new close: $!");
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&swapfile("include/elf/mep.h");
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redo_file ("bfd/reloc.c",
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           "",
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           "ENUMDOC\n  Toshiba Media Processor Relocations.\n\nCOMMENT\n",
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           "ENUM\n  BFD_RELOC_MEP_%s\n",
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           "");
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$autogen = "    /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */\n";
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redo_file ("bfd/elf32-mep.c",
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           "MEPRELOC:HOWTO",
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           $autogen,
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           "MEPRELOC:END",
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           "",
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           "&emit_howto();",
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           "MEPRELOC:MAP",
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           $autogen,
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           "MEPRELOC:END",
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           "",
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           "    MAP(%s);\n",
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           "MEPRELOC:APPLY",
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           $autogen,
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           "MEPRELOC:END",
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           "",
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           "&emit_apply();",
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           );
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sub mask2shifts {
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    my ($mask) = @_;
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    my ($bits, $left, $right, $ci, $c, $cv);
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    $bits = 0;
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    $left = 0;
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    $right = 32;
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    for ($ci=0; $ci<length($mask); $ci++) {
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        $c = substr($mask, $ci, 1);
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        $left++;
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        next if $c eq '-';
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        $left = 0;
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        $cv = ord($c) - ord('0');
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        $cv -= ord('a') - ord('9') - 1 if $cv > 9;
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        $right = $cv unless $right < $cv;
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        $bits = $cv+1 unless $bits > $cv+1;
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    }
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    $mask =~ tr/-/1/c;
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    $mask =~ tr/-/0/;
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    ($rmask = $mask) =~ tr/01/10/;
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    $mask = unpack("H*", pack("B*", $mask));
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    $rmask = unpack("H*", pack("B*", $rmask));
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    return ($bits, $left, $right, $mask, $rmask);
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}
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sub emit_howto {
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    for ($i=2; $i<=$#relocs; $i++) {
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        $mask = $pattern[$i];
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        if (length($mask) == 8)     { $bytesize = 0; }
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        elsif (length($mask) == 16) { $bytesize = 1; }
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        elsif (length($mask) == 32) { $bytesize = 2; }
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        ($bits, $left, $right, $mask) = mask2shifts ($mask);
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        $bits[$i] = $bits;
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        $pcrel = 0;
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        $pcrel = 1 if $attrs[$i] =~ /pc-rel/i;
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        $overflow = $sign[$i];
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        $overflow = 'N' if $attrs[$i] =~ /no-overflow/;
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        $c = "$relocs[$i],";
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        printf(NEW "  MEPREL (R_MEP_%-10s%d,%3d,%2d,%2d,%2d,%2s, 0x%s),\n",
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               $c, $bytesize, $bits, $left, $right, $pcrel, $overflow, $mask);
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    }
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}
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sub emit_apply {
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    for ($i=2; $i<=$#relocs; $i++) {
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        $v = "u";
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        $v = "s" if $sign[$i] =~ /S/;
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        if (length($pattern[$i]) == 8) {
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            $e = ''; # no endian swap for bytes
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        } elsif ($pattern[$i] =~ /-/ || length($pattern[$i]) == 16) {
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            $e = '^e2'; # endian swap - 2byte words only
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        } else {
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            $e = '^e4' # endian swap for data
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        }
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        print NEW "    case R_MEP_$relocs[$i]: /* $pattern[$i] */\n";
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        if ($attrs[$i] =~ /tp-rel/i) {
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            print NEW "      $v -= mep_tpoff_base(rel->r_offset);\n";
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        }
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        if ($attrs[$i] =~ /gp-rel/i) {
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            print NEW "      $v -= mep_sdaoff_base(rel->r_offset);\n";
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        }
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        if ($attrs[$i] !~ /no-overflow/ && $bits[$i] < 32) {
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            if ($v eq "u") {
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                $max = (1 << $bits[$i]) - 1;
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                print NEW "      if (u > $max) r = bfd_reloc_overflow;\n";
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            } else {
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                $min = -(1 << ($bits[$i]-1));
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                $max = (1 << ($bits[$i]-1)) - 1;
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                print NEW "      if ($min > s || s > $max) r = bfd_reloc_overflow;\n";
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            }
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        }
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        for ($b=0; $b<length($pattern[$i]); $b += 8) {
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            $mask = substr($pattern[$i], $b, 8);
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            ($bits, $left, $right, $mask, $rmask) = mask2shifts ($mask);
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            if ($left > $right) { $left -= $right; $right = 0; }
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            else { $right -= $left; $left = 0; }
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            if ($mask ne "00") {
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                $bb = $b / 8;
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                print NEW "      byte[$bb$e] = ";
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                print NEW "(byte[$bb$e] & 0x$rmask) | " if $rmask ne "00";
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                if ($left) {
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                    print NEW "(($v << $left) & 0x$mask)";
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                } elsif ($right) {
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                    print NEW "(($v >> $right) & 0x$mask)";
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                } else {
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                    print NEW "($v & 0x$mask)";
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                }
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                print NEW ";\n";
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            }
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        }
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        print NEW "      break;\n";
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    }
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}
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#-----------------------------------------------------------------------------
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sub redo_file {
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    my ($file, @control) = @_;
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    open(OLD, $file);
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    open(NEW, "> $file.new") || die("$file.new create: $!");
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    print "Scanning file $file ...\n";
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    while (1) {
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        $start = shift @control;
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        $prefix = shift @control;
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        $end = shift @control;
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        $suffix = shift @control;
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        $pattern = shift @control;
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        if (!$start) {
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            print NEW while <OLD>;
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            last;
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        }
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        print "  looking for $start\n";
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        while (<OLD>) {
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            print NEW;
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            last if /\Q$start\E/;
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        }
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        print "can't find $start\n" unless $_;
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        last unless $_;
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        print NEW $prefix;
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        if ($pattern =~ /^\&/) {
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            eval $pattern;
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            die("$pattern: $@") if $@;
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        } else {
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            for $i (2..$#relocs) {
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                printf (NEW "$pattern", $relocs[$i]) || die("$file.new write: $!");
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                $pattern =~ s/^ENUM\n/ENUMX\n/;
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            }
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        }
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        print NEW $suffix;
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        while (<OLD>) {
241
            last if /\Q$end\E/;
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        }
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        print NEW;
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    }
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246
    close(OLD);
247
    close(NEW) || die("$file.new close: $!");
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    &swapfile($file);
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}
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251
#-----------------------------------------------------------------------------
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sub swapfile {
254
    my ($f) = @_;
255
    if ( ! -f "$f.save") {
256
        system "cp $f $f.save";
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    }
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    open(ORIG, $f);
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    open(NEW, "$f.new");
260
    while (<ORIG>) {
261
        $n = <NEW>;
262
        if ($n ne $_) {
263
            close(ORIG);
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            close(NEW);
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            print "  Updating $f\n";
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            rename "$f", "$f.old";
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            rename "$f.new", "$f";
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            return;
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        }
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    }
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    close(ORIG);
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    close(NEW);
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    print "  No change to $f\n";
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    unlink "$f.new";
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}

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