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#!/usr/bin/perl

# -*- perl -*-

#

# Toshiba MeP Media Engine Relocation Generator

# Copyright (C) 2001, 2007 Free Software Foundation, Inc.

# This file is part of BFD.

# Originally written by DJ Delorie <dj@redhat.com>

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3 of the License, or

# (at your option) any later version.

# 

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

# MA 02110-1301, USA.

# Usage: Run this anywhere inside your source tree.  It will read

# include/elf/mep.h and scan the comments therein.  It will renumber

# the relocs to be sequential (this is needed so that bfd/elf32-mep.h

# works) if needed.  It will then update the reloc list in bfd/reloc.c

# and the howto, mapping, and apply routines in bfd/elf32-mep.c.  You

# can then regenerate bfd-in2.h and check everything in.

# FIXME: After the relocation list is finalized, change this to

# *verify* the reloc list, rather than resequence it.

while (! -f "include/elf/mep.h" && ! -f "bfd/reloc.c") {

    chdir "..";

    $pwd = `pwd`;

    if ($pwd !~ m@/.*/@) {

        print STDERR "Cannot find include/elf/mep.h or bfd/reloc.h\n";

        exit 1;

    }

}

$pwd = `pwd`;

print "srctop is $pwd";

printf "Reading include/elf/mep.h ...\n";

open(MEPH, "include/elf/mep.h");

open(MEPHO, "> include/elf/mep.h.new") || die("mep.h.new create: $!");

$val = 0;

while (<MEPH>) {

    if (($pre,$rel,$rest) = /(.*RELOC_NUMBER \()([^,]+), *\d+(.*)/) {

        $rest =~ s/[\r\n]+$//;

        print (MEPHO "$pre$rel, $val$rest\n") || die("mep.h.new write: $!");

        $val ++;

        $rel =~ s/R_MEP_//;

        push(@relocs, $rel);

        $rest =~ s@.*/\* @@;

        ($pattern, $sign, $attrs) = $rest =~ m@(.*) ([US]) (.*)\*/@;

        $pattern =~ s/ //g;

        push(@pattern, $pattern);

        push(@sign, $sign);

        push(@attrs, $attrs);

        printf "%4d $rel p=`$pattern' s=`$sign' a=`$attrs'\n", $#pattern;

    } else {

        print(MEPHO) || die("mep.h.new write: $!");

    }

}

close(MEPH);

close(MEPHO) || die("mep.h.new close: $!");

&swapfile("include/elf/mep.h");

redo_file ("bfd/reloc.c",

           "",

           "ENUMDOC\n  Toshiba Media Processor Relocations.\n\nCOMMENT\n",

           "ENUM\n  BFD_RELOC_MEP_%s\n",

           "");

$autogen = "    /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */\n";

redo_file ("bfd/elf32-mep.c",

           "MEPRELOC:HOWTO",

           $autogen,

           "MEPRELOC:END",

           "",

           "&emit_howto();",

           "MEPRELOC:MAP",

           $autogen,

           "MEPRELOC:END",

           "",

           "    MAP(%s);\n",

           "MEPRELOC:APPLY",

           $autogen,

           "MEPRELOC:END",

           "",

           "&emit_apply();",

           );

sub mask2shifts {

    my ($mask) = @_;

    my ($bits, $left, $right, $ci, $c, $cv);

    $bits = 0;

    $left = 0;

    $right = 32;

    for ($ci=0; $ci<length($mask); $ci++) {

        $c = substr($mask, $ci, 1);

        $left++;

        next if $c eq '-';

        $left = 0;

        $cv = ord($c) - ord('0');

        $cv -= ord('a') - ord('9') - 1 if $cv > 9;

        $right = $cv unless $right < $cv;

        $bits = $cv+1 unless $bits > $cv+1;

    }

    $mask =~ tr/-/1/c;

    $mask =~ tr/-/0/;

    ($rmask = $mask) =~ tr/01/10/;

    $mask = unpack("H*", pack("B*", $mask));

    $rmask = unpack("H*", pack("B*", $rmask));

    return ($bits, $left, $right, $mask, $rmask);

}

sub emit_howto {

    for ($i=2; $i<=$#relocs; $i++) {

        $mask = $pattern[$i];

        if (length($mask) == 8)     { $bytesize = 0; }

        elsif (length($mask) == 16) { $bytesize = 1; }

        elsif (length($mask) == 32) { $bytesize = 2; }

        ($bits, $left, $right, $mask) = mask2shifts ($mask);

        $bits[$i] = $bits;

        $pcrel = 0;

        $pcrel = 1 if $attrs[$i] =~ /pc-rel/i;

        $overflow = $sign[$i];

        $overflow = 'N' if $attrs[$i] =~ /no-overflow/;

        $c = "$relocs[$i],";

        printf(NEW "  MEPREL (R_MEP_%-10s%d,%3d,%2d,%2d,%2d,%2s, 0x%s),\n",

               $c, $bytesize, $bits, $left, $right, $pcrel, $overflow, $mask);

    }

}

sub emit_apply {

    for ($i=2; $i<=$#relocs; $i++) {

        $v = "u";

        $v = "s" if $sign[$i] =~ /S/;

        if (length($pattern[$i]) == 8) {

            $e = ''; # no endian swap for bytes

        } elsif ($pattern[$i] =~ /-/ || length($pattern[$i]) == 16) {

            $e = '^e2'; # endian swap - 2byte words only

        } else {

            $e = '^e4' # endian swap for data

        }

        print NEW "    case R_MEP_$relocs[$i]: /* $pattern[$i] */\n";

        if ($attrs[$i] =~ /tp-rel/i) {

            print NEW "      $v -= mep_tpoff_base(rel->r_offset);\n";

        }

        if ($attrs[$i] =~ /gp-rel/i) {

            print NEW "      $v -= mep_sdaoff_base(rel->r_offset);\n";

        }

        if ($attrs[$i] !~ /no-overflow/ && $bits[$i] < 32) {

            if ($v eq "u") {

                $max = (1 << $bits[$i]) - 1;

                print NEW "      if (u > $max) r = bfd_reloc_overflow;\n";

            } else {

                $min = -(1 << ($bits[$i]-1));

                $max = (1 << ($bits[$i]-1)) - 1;

                print NEW "      if ($min > s || s > $max) r = bfd_reloc_overflow;\n";

            }

        }

        for ($b=0; $b<length($pattern[$i]); $b += 8) {

            $mask = substr($pattern[$i], $b, 8);

            ($bits, $left, $right, $mask, $rmask) = mask2shifts ($mask);

            if ($left > $right) { $left -= $right; $right = 0; }

            else { $right -= $left; $left = 0; }

            if ($mask ne "00") {

                $bb = $b / 8;

                print NEW "      byte[$bb$e] = ";

                print NEW "(byte[$bb$e] & 0x$rmask) | " if $rmask ne "00";

                if ($left) {

                    print NEW "(($v << $left) & 0x$mask)";

                } elsif ($right) {

                    print NEW "(($v >> $right) & 0x$mask)";

                } else {

                    print NEW "($v & 0x$mask)";

                }

                print NEW ";\n";

            }

        }

        print NEW "      break;\n";

    }

}

#-----------------------------------------------------------------------------

sub redo_file {

    my ($file, @control) = @_;

    open(OLD, $file);

    open(NEW, "> $file.new") || die("$file.new create: $!");

    print "Scanning file $file ...\n";

    while (1) {

        $start = shift @control;

        $prefix = shift @control;

        $end = shift @control;

        $suffix = shift @control;

        $pattern = shift @control;

        if (!$start) {

            print NEW while <OLD>;

            last;

        }

        print "  looking for $start\n";

        while (<OLD>) {

            print NEW;

            last if /\Q$start\E/;

        }

        print "can't find $start\n" unless $_;

        last unless $_;

        print NEW $prefix;

        if ($pattern =~ /^\&/) {

            eval $pattern;

            die("$pattern: $@") if $@;

        } else {

            for $i (2..$#relocs) {

                printf (NEW "$pattern", $relocs[$i]) || die("$file.new write: $!");

                $pattern =~ s/^ENUM\n/ENUMX\n/;

            }

        }

        print NEW $suffix;

        while (<OLD>) {

            last if /\Q$end\E/;

        }

        print NEW;

    }

    close(OLD);

    close(NEW) || die("$file.new close: $!");

    &swapfile($file);

}

#-----------------------------------------------------------------------------

sub swapfile {

    my ($f) = @_;

    if ( ! -f "$f.save") {

        system "cp $f $f.save";

    }

    open(ORIG, $f);

    open(NEW, "$f.new");

    while (<ORIG>) {

        $n = <NEW>;

        if ($n ne $_) {

            close(ORIG);

            close(NEW);

            print "  Updating $f\n";

            rename "$f", "$f.old";

            rename "$f.new", "$f";

            return;

        }

    }

    close(ORIG);

    close(NEW);

    print "  No change to $f\n";

    unlink "$f.new";

}