276 lines
7.2 KiB
Perl
Executable File
276 lines
7.2 KiB
Perl
Executable File
#!/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) 2001-2019 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 $suffix;
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while (<OLD>) {
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last if /\Q$end\E/;
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}
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print NEW;
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}
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close(OLD);
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close(NEW) || die("$file.new close: $!");
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&swapfile($file);
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}
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#-----------------------------------------------------------------------------
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sub swapfile {
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my ($f) = @_;
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if ( ! -f "$f.save") {
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system "cp $f $f.save";
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}
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open(ORIG, $f);
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open(NEW, "$f.new");
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while (<ORIG>) {
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$n = <NEW>;
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if ($n ne $_) {
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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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