--- risugen_m68k.pm | 295 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 295 insertions(+) create mode 100644 risugen_m68k.pm
diff --git a/risugen_m68k.pm b/risugen_m68k.pm new file mode 100644 index 0000000..a9a4341 --- /dev/null +++ b/risugen_m68k.pm @@ -0,0 +1,295 @@ +#!/usr/bin/perl -w +############################################################################### +# Copyright (c) 2016 Laurent Vivier +# All rights reserved. This program and the accompanying materials +# are made available under the terms of the Eclipse Public License v1.0 +# which accompanies this distribution, and is available at +# http://www.eclipse.org/legal/epl-v10.html +############################################################################### + + +# risugen -- generate a test binary file for use with risu +# See 'risugen --help' for usage information. +package risugen_m68k; + +use strict; +use warnings; + +require Exporter; + +our @ISA = qw(Exporter); +our @EXPORT = qw(write_test_code); + +my $periodic_reg_random = 1; + +my $bytecount; +# +# Maximum alignment restriction permitted for a memory op. +my $MAXALIGN = 64; + +sub open_bin +{ + my ($fname) = @_; + open(BIN, ">", $fname) or die "can't open %fname: $!"; + $bytecount = 0; +} + +sub close_bin +{ + close(BIN) or die "can't close output file: $!"; +} + +sub insn32($) +{ + my ($insn) = @_; + print BIN pack("N", $insn); + $bytecount += 4; +} + +sub insn16($) +{ + my ($insn) = @_; + print BIN pack("n", $insn); + $bytecount += 2; +} + +sub write_risuop($) +{ + my ($op) = @_; + insn32(0x4afc7000 | $op); +} + +sub write_mov_ccr($) +{ + my ($imm) = @_; + insn16(0x44fc); + insn16($imm); +} + +sub write_movb_di($$) +{ + my ($r, $imm) = @_; + + # move.b #imm,%dr + insn16(0x103c | ($r << 9)); + insn16($imm) +} + +sub write_mov_di($$) +{ + my ($r, $imm) = @_; + + # move.l #imm,%dr + insn16(0x203c | ($r << 9)); + insn32($imm) +} + +sub write_mov_ai($$) +{ + my ($r, $imm) = @_; + + # movea.l #imm,%ar + insn16(0x207c | ($r << 9)); + insn32($imm) +} + +sub write_mov_ri($$) +{ + my ($r, $imm) = @_; + + if ($r < 8) { + write_mov_di($r, $imm); + } else { + write_mov_ai($r - 8, $imm); + } +} + +sub write_random_regdata() +{ + # general purpose registers (except A6 (FP) and A7 (SP)) + for (my $i = 0; $i < 14; $i++) { + write_mov_ri($i, rand(0xffffffff)); + } + # initialize condition register + write_mov_ccr(rand(0x10000)); +} + +my $OP_COMPARE = 0; # compare registers +my $OP_TESTEND = 1; # end of test, stop +my $OP_SETMEMBLOCK = 2; # r0 is address of memory block (8192 bytes) +my $OP_GETMEMBLOCK = 3; # add the address of memory block to r0 +my $OP_COMPAREMEM = 4; # compare memory block + +sub write_random_register_data() +{ + write_random_regdata(); + write_risuop($OP_COMPARE); +} + +sub eval_with_fields($$$$$) { + # Evaluate the given block in an environment with Perl variables + # set corresponding to the variable fields for the insn. + # Return the result of the eval; we die with a useful error + # message in case of syntax error. + my ($insnname, $insn, $rec, $blockname, $block) = @_; + my $evalstr = "{ "; + for my $tuple (@{ $rec->{fields} }) { + my ($var, $pos, $mask) = @$tuple; + my $val = ($insn >> $pos) & $mask; + $evalstr .= "my (\$$var) = $val; "; + } + $evalstr .= $block; + $evalstr .= "}"; + my $v = eval $evalstr; + if ($@) { + print "Syntax error detected evaluating $insnname $blockname string:\n$block\n$@"; + exit(1); + } + return $v; +} + +sub gen_one_insn($$) +{ + # Given an instruction-details array, generate an instruction + my $constraintfailures = 0; + + INSN: while(1) { + my ($forcecond, $rec) = @_; + my $insn = int(rand(0xffffffff)); + my $insnname = $rec->{name}; + my $insnwidth = $rec->{width}; + my $fixedbits = $rec->{fixedbits}; + my $fixedbitmask = $rec->{fixedbitmask}; + my $constraint = $rec->{blocks}{"constraints"}; + my $memblock = $rec->{blocks}{"memory"}; + + $insn &= ~$fixedbitmask; + $insn |= $fixedbits; + + for my $tuple (@{ $rec->{fields} }) { + my ($var, $pos, $mask) = @$tuple; + my $val = ($insn >> $pos) & $mask; + # Check constraints here: + # not allowed to use or modify sp (A7) or fp (A6) + next INSN if ($var =~ /^A/ && (($val == 6) || ($val == 7))); + } + if (defined $constraint) { + # user-specified constraint: evaluate in an environment + # with variables set corresponding to the variable fields. + my $v = eval_with_fields($insnname, $insn, $rec, "constraints", $constraint); + if (!$v) { + $constraintfailures++; + if ($constraintfailures > 10000) { + print "10000 consecutive constraint failures for $insnname constraints string:\n$constraint\n"; + exit (1); + } + next INSN; + } + } + + # OK, we got a good one + $constraintfailures = 0; + + insn16($insn >> 16); + if ($insnwidth == 32) { + insn16($insn & 0xffff); + } + + return; + } +} + +my $lastprog; +my $proglen; +my $progmax; + +sub progress_start($$) +{ + ($proglen, $progmax) = @_; + $proglen -= 2; # allow for [] chars + $| = 1; # disable buffering so we can see the meter... + print "[" . " " x $proglen . "]\r"; + $lastprog = 0; +} + +sub progress_update($) +{ + # update the progress bar with current progress + my ($done) = @_; + my $barlen = int($proglen * $done / $progmax); + if ($barlen != $lastprog) { + $lastprog = $barlen; + print "[" . "-" x $barlen . " " x ($proglen - $barlen) . "]\r"; + } +} + +sub progress_end() +{ + print "[" . "-" x $proglen . "]\n"; + $| = 0; +} + +sub write_test_code($) +{ + my ($params) = @_; + + my $condprob = $params->{ 'condprob' }; + my $numinsns = $params->{ 'numinsns' }; + my $outfile = $params->{ 'outfile' }; + + my @pattern_re = @{ $params->{ 'pattern_re' } }; + my @not_pattern_re = @{ $params->{ 'not_pattern_re' } }; + my %insn_details = %{ $params->{ 'details' } }; + + open_bin($outfile); + + # convert from probability that insn will be conditional to + # probability of forcing insn to unconditional + $condprob = 1 - $condprob; + + # TODO better random number generator? + srand(0); + + # Get a list of the insn keys which are permitted by the re patterns + my @keys = sort keys %insn_details; + if (@pattern_re) { + my $re = '\b((' . join(')|(',@pattern_re) . '))\b'; + @keys = grep /$re/, @keys; + } + # exclude any specifics + if (@not_pattern_re) { + my $re = '\b((' . join(')|(',@not_pattern_re) . '))\b'; + @keys = grep !/$re/, @keys; + } + if (!@keys) { + print STDERR "No instruction patterns available! (bad config file or --pattern argument?)\n"; + exit(1); + } + print "Generating code using patterns: @keys...\n"; + progress_start(78, $numinsns); + + if (grep { defined($insn_details{$_}->{blocks}->{"memory"}) } @keys) { + write_memblock_setup(); + } + + # memblock setup doesn't clean its registers, so this must come afterwards. + write_random_register_data(); + + for my $i (1..$numinsns) { + my $insn_enc = $keys[int rand (@keys)]; + my $forcecond = (rand() < $condprob) ? 1 : 0; + gen_one_insn($forcecond, $insn_details{$insn_enc}); + write_risuop($OP_COMPARE); + # Rewrite the registers periodically. This avoids the tendency + # for the VFP registers to decay to NaNs and zeroes. + if ($periodic_reg_random && ($i % 100) == 0) { + write_random_register_data(); + } + progress_update($i); + } + write_risuop($OP_TESTEND); + progress_end(); + close_bin(); +} + +1; -- 2.9.3
