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Added CHK

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Leeland Heins 2018-12-19 07:23:21 -06:00 committed by GitHub
parent 015cc489a0
commit f0cfa15324
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 42 additions and 9 deletions
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as65.pl
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@ -23,6 +23,8 @@ my $base = 0x800; # Default base address. Overide with -a (decimal) or -x (hex
my $output_file = ''; # Output file, required to be set with -o command line flag.
my $checksum = 0;
sub usage {
print "Usage:\n";
print "$0 [-a addr] [-x \$addr] [-v] [-q] [-d] [-s] [-l] [-l1] [-l2] [-c] [-h] <input_file>\n";
@ -739,12 +741,20 @@ my %mnemonics = (
},
);
sub calc_checksum {
my ($byte) = @_;
$checksum ^= $byte;
}
# Generate code for one byte instructions.
sub generate_8 {
my ($ofh, $addr, $opcode) = @_;
print sprintf("* %04x- %02x\n", $addr, $opcode) if $code_listing;
print $ofh pack("C", $opcode);
calc_checksum($opcode);
}
# Generate code for two byte instructions.
@ -754,6 +764,9 @@ sub generate_16 {
print sprintf("* %04x- %02x %02x\n", $addr, $opcode, $opval) if $code_listing;
print $ofh pack("C", $opcode);
print $ofh pack("C", $opval);
calc_checksum($opcode);
calc_checksum($opval);
}
# Generate code for three byte instructions.
@ -764,6 +777,10 @@ sub generate_24 {
print $ofh pack("C", $opcode);
print $ofh pack("C", $opval1);
print $ofh pack("C", $opval2);
calc_checksum($opcode);
calc_checksum($opval1);
calc_checksum($opval2);
}
sub sym_add {
@ -2045,20 +2062,31 @@ if (open($ifh, "<$input_file")) {
$operand =~ s/^\$//;
$base = hex(lc($operand));
$addr = $base;
print "%%%% Setting base to $base\n" if $verbose;
print sprintf("%%%%%%%% Setting base to \$%04x\n", $base) if $verbose;
} elsif ($ucmnemonic =~ /EQU|\.EQ/i) {
# define constant
my $symbol = $label;
$symbol =~ s/:$//;
print "%%%% Saving Symbol $symbol $operand\n" if $verbose;
$symbols{$symbol} = $operand;
} elsif ($ucmnemonic =~ /HEX|ASC/i) {
$addr++;
} elsif ($ucmnemonic =~ /HEX/i) {
if ($label ne '') {
my $symbol = $label;
$symbol =~ s/:$//;
$symbols{$symbol} = sprintf("\$%04x", $addr);
}
if ($operand =~ /([0-9a-fA-F]+)/) {
$addr += (length($1) / 2);
}
} elsif ($ucmnemonic =~ /ASC/i) {
if ($label ne '') {
my $symbol = $label;
$symbol =~ s/:$//;
$symbols{$symbol} = sprintf("\$%04x", $addr);
}
my ($str) = $operand =~ /^\"(.+)\"$/;
$addr += length($str);
} elsif ($ucmnemonic =~ /OBJ|CHK/i) {
##FIXME -- need to implement checksum
# Just ignore this
# Mnemonic Addressing mode Form Opcode Size Timing
} elsif (defined $mnemonics{$ucmnemonic}) {
@ -2082,7 +2110,7 @@ if (open($ifh, "<$input_file")) {
print "\n" if $verbose;
if ($symbol_table) {
print "---- Symbol table ----\n";
print "---- Symbol table ----\n\n";
foreach my $ky (keys %symbols) {
print sprintf("%-10s : %s\n", $ky, $symbols{$ky});
@ -2102,6 +2130,7 @@ if (open($ifh, "<$input_file")) {
$addr = $base;
$lineno = 0;
$checksum = 0;
# Pass two, generate output
open($ofh, ">$output_file") or die "Can't write $output_file\n";
@ -2138,7 +2167,7 @@ if (open($ifh, "<$input_file")) {
# Skip ORG, EQU and OBJ on pass 2.
next if $ucmnemonic =~ /ORG/i;
next if $ucmnemonic =~ /EQU|\.EQ/i;
next if $ucmnemonic =~ /OBJ|CHK/i;
next if $ucmnemonic =~ /OBJ/i;
if (defined $mnemonics{$ucmnemonic}) {
my $foundit = 0;
@ -2159,6 +2188,7 @@ if (open($ifh, "<$input_file")) {
my @bytes = map { pack('C', hex($_)) } ($operand =~ /(..)/g);
foreach my $byte (@bytes) {
generate_8($ofh, $addr, ord($byte));
$addr++;
}
} elsif ($ucmnemonic eq 'ASC') {
# Unpack string dats.
@ -2166,7 +2196,10 @@ if (open($ifh, "<$input_file")) {
my @bytes = map { pack('C', ord($_)) } ($str =~ /(.)/g);
foreach my $byte (@bytes) {
generate_8($ofh, $addr, ord($byte) + 128);
$addr++;
}
} elsif ($ucmnemonic eq 'CHK') {
generate_8($ofh, $addr, $checksum);
} else {
print "$lineno - Unknown mnemonic '$mnemonic'\n";
}