259 lines
6.8 KiB
Perl
259 lines
6.8 KiB
Perl
#!/usr/bin/perl
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#
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# insns.pl produce insnsa.c, insnsd.c, insnsi.h, insnsn.c from insns.dat
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#
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# The Netwide Assembler is copyright (C) 1996 Simon Tatham and
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# Julian Hall. All rights reserved. The software is
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# redistributable under the licence given in the file "Licence"
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# distributed in the NASM archive.
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print STDERR "Reading insns.dat...\n";
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@args = ();
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undef $output;
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foreach $arg ( @ARGV ) {
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if ( $arg =~ /^\-/ ) {
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if ( $arg =~ /^\-([adin])$/ ) {
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$output = $1;
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} else {
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die "$0: Unknown option: ${arg}\n";
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}
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} else {
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push (@args, $arg);
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}
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}
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$fname = "insns.dat" unless $fname = $args[0];
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open (F, $fname) || die "unable to open $fname";
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$line = 0;
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$insns = 0;
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while (<F>) {
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$line++;
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next if /^\s*;/; # comments
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chomp;
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split;
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next if $#_ == -1; # blank lines
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(warn "line $line does not contain four fields\n"), next if $#_ != 3;
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($formatted, $nd) = &format(@_);
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if ($formatted) {
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$insns++;
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$aname = "aa_$_[0]";
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push @$aname, $formatted;
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}
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if ( $_[0] =~ /cc$/ ) {
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# Conditional instruction
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$k_opcodes_cc{$_[0]}++;
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} else {
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# Unconditional instruction
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$k_opcodes{$_[0]}++;
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}
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if ($formatted && !$nd) {
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push @big, $formatted;
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foreach $i (&startbyte($_[2])) {
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$aname = sprintf "dd_%02X",$i;
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push @$aname, $#big;
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}
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}
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}
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close F;
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@opcodes = sort keys(%k_opcodes);
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@opcodes_cc = sort keys(%k_opcodes_cc);
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if ( !defined($output) || $output eq 'a' ) {
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print STDERR "Writing insnsa.c...\n";
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open A, ">insnsa.c";
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print A "/* This file auto-generated from insns.dat by insns.pl" .
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" - don't edit it */\n\n";
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print A "#include \"nasm.h\"\n";
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print A "#include \"insns.h\"\n";
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print A "\n";
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foreach $i (@opcodes, @opcodes_cc) {
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print A "static struct itemplate instrux_${i}[] = {\n";
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$aname = "aa_$i";
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foreach $j (@$aname) {
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print A " $j\n";
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}
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print A " ITEMPLATE_END\n};\n\n";
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}
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print A "struct itemplate *nasm_instructions[] = {\n";
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foreach $i (@opcodes, @opcodes_cc) {
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print A " instrux_${i},\n";
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}
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print A "};\n";
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close A;
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}
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if ( !defined($output) || $output eq 'd' ) {
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print STDERR "Writing insnsd.c...\n";
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open D, ">insnsd.c";
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print D "/* This file auto-generated from insns.dat by insns.pl" .
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" - don't edit it */\n\n";
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print D "#include \"nasm.h\"\n";
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print D "#include \"insns.h\"\n";
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print D "\n";
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print D "static struct itemplate instrux[] = {\n";
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foreach $j (@big) {
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print D " $j\n";
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}
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print D " ITEMPLATE_END\n};\n\n";
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for ($c=0; $c<256; $c++) {
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$h = sprintf "%02X", $c;
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print D "static struct itemplate *itable_${h}[] = {\n";
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$aname = "dd_$h";
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foreach $j (@$aname) {
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print D " instrux + $j,\n";
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}
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print D " NULL\n};\n\n";
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}
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print D "struct itemplate **itable[] = {\n";
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for ($c=0; $c<256; $c++) {
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printf D " itable_%02X,\n", $c;
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}
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print D "};\n";
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close D;
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}
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if ( !defined($output) || $output eq 'i' ) {
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print STDERR "Writing insnsi.h...\n";
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open I, ">insnsi.h";
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print I "/* This file is auto-generated from insns.dat by insns.pl" .
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" - don't edit it */\n\n";
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print I "/* This file in included by nasm.h */\n\n";
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print I "/* Instruction names */\n";
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print I "enum {";
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$first = 1;
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$maxlen = 0;
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foreach $i (@opcodes, @opcodes_cc) {
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print I "," if ( !$first );
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$first = 0;
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print I "\n\tI_${i}";
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$len = length($i);
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$len++ if ( $i =~ /cc$/ ); # Condition codes can be 3 characters long
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$maxlen = $len if ( $len > $maxlen );
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}
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print I "\n};\n\n";
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print I "#define MAX_INSLEN ", $maxlen, "\n";
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close I;
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}
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if ( !defined($output) || $output eq 'n' ) {
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print STDERR "Writing insnsn.c...\n";
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open N, ">insnsn.c";
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print N "/* This file is auto-generated from insns.dat by insns.pl" .
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" - don't edit it */\n\n";
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print N "/* This file in included by names.c */\n\n";
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print N "static const char *insn_names[] = {";
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$first = 1;
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foreach $i (@opcodes) {
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print N "," if ( !$first );
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$first = 0;
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$ilower = $i;
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$ilower =~ tr/A-Z/a-z/; # Change to lower case (Perl 4 compatible)
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print N "\n\t\"${ilower}\"";
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}
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print N "\n};\n\n";
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print N "/* Conditional instructions */\n";
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print N "static const char *icn[] = {";
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$first = 1;
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foreach $i (@opcodes_cc) {
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print N "," if ( !$first );
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$first = 0;
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$ilower = $i;
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$ilower =~ s/cc$//; # Skip cc suffix
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$ilower =~ tr/A-Z/a-z/; # Change to lower case (Perl 4 compatible)
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print N "\n\t\"${ilower}\"";
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}
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print N "\n};\n\n";
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print N "/* and the corresponding opcodes */\n";
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print N "static int ico[] = {";
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$first = 1;
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foreach $i (@opcodes_cc) {
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print N "," if ( !$first );
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$first = 0;
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print N "\n\tI_$i";
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}
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print N "\n};\n";
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close N;
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}
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printf STDERR "Done: %d instructions\n", $insns;
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sub format {
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local ($opcode, $operands, $codes, $flags) = @_;
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local $num, $nd = 0;
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return (undef, undef) if $operands eq "ignore";
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# format the operands
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$operands =~ s/:/|colon,/g;
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$operands =~ s/mem(\d+)/mem|bits$1/g;
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$operands =~ s/mem/memory/g;
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$operands =~ s/memory_offs/mem_offs/g;
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$operands =~ s/imm(\d+)/imm|bits$1/g;
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$operands =~ s/imm/immediate/g;
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$operands =~ s/rm(\d+)/regmem|bits$1/g;
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$num = 3;
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$operands = '0,0,0', $num = 0 if $operands eq 'void';
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$operands .= ',0', $num-- while $operands !~ /,.*,/;
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$operands =~ tr/a-z/A-Z/;
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# format the flags
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$flags =~ s/,/|IF_/g;
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$flags =~ s/(\|IF_ND|IF_ND\|)//, $nd = 1 if $flags =~ /IF_ND/;
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$flags = "IF_" . $flags;
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("{I_$opcode, $num, {$operands}, \"$codes\", $flags},", $nd);
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}
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# Here we determine the range of possible starting bytes for a given
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# instruction. We need only consider the codes:
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# \1 \2 \3 mean literal bytes, of course
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# \4 \5 \6 \7 mean PUSH/POP of segment registers: special case
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# \10 \11 \12 mean byte plus register value
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# \17 means byte zero
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# \330 means byte plus condition code
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# \0 or \340 mean give up and return empty set
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sub startbyte {
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local ($codes) = @_;
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local $word, @range;
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while (1) {
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die "couldn't get code in '$codes'" if $codes !~ /^(\\[^\\]+)(\\.*)?$/;
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$word = $1, $codes = $2;
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return (hex $1) if $word =~ /^\\[123]$/ && $codes =~ /^\\x(..)/;
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return (0x07, 0x17, 0x1F) if $word eq "\\4";
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return (0xA1, 0xA9) if $word eq "\\5";
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return (0x06, 0x0E, 0x16, 0x1E) if $word eq "\\6";
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return (0xA0, 0xA8) if $word eq "\\7";
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$start=hex $1, $r=8, last if $word =~ /^\\1[012]$/ && $codes =~/^\\x(..)/;
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return (0) if $word eq "\\17";
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$start=hex $1, $r=16, last if $word =~ /^\\330$/ && $codes =~ /^\\x(..)/;
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return () if $word eq "\\0" || $word eq "\\340";
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}
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@range = ();
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push @range, $start++ while ($r-- > 0);
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@range;
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}
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