Retro68/binutils/bfd/mep-relocs.pl

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#!/usr/bin/perl
# -*- perl -*-
#
# Toshiba MeP Media Engine Relocation Generator
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# Copyright (C) 2001-2022 Free Software Foundation, Inc.
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# 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.
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#
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# 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.
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#
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# 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";
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if ($relocs[$i] =~ /HI16S/) {
print NEW " u += 0x8000;\n"
}
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if ($attrs[$i] =~ /tp-rel/i) {
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print NEW " u -= mep_tpoff_base(rel->r_offset);\n";
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}
if ($attrs[$i] =~ /gp-rel/i) {
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print NEW " u -= mep_sdaoff_base(rel->r_offset);\n";
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}
if ($attrs[$i] !~ /no-overflow/ && $bits[$i] < 32) {
if ($v eq "u") {
$max = (1 << $bits[$i]) - 1;
print NEW " if (u > $max) r = bfd_reloc_overflow;\n";
} else {
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$min = (1 << ($bits[$i]-1));
$max = (1 << ($bits[$i])) - 1;
print NEW " if (u + $min > $max) r = bfd_reloc_overflow;\n";
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}
}
for ($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) {
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print NEW "((u << $left) & 0x$mask)";
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} elsif ($right) {
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print NEW "((u >> $right) & 0x$mask)";
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} else {
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print NEW "(u & 0x$mask)";
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}
print NEW ";\n";
}
}
print NEW " break;\n";
}
}
#-----------------------------------------------------------------------------
sub redo_file {
my ($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";
}