move memory layout around to free more code space

1 files changed, 19 insertions, 0 deletions

diff --git a/size.pl b/size.pl
new file mode 100644
index 0000000..1d012bc
--- /dev/null
+++ b/size.pl
@@ -0,0 +1,19 @@
+#!/usr/bin/perl -w
+
+my $stack_size = oct(shift) || die "no stack size";
+
+open MAP, "<taipan.map" or die $!;
+while(<MAP>) {
+	next unless /^BSS/;
+	(undef, $bss_start, $bss_end, undef) = split /\s+/;
+	$bss_start = hex $bss_start;
+	$bss_end = hex $bss_end;
+}
+close MAP;
+
+$free = (0xbc20 - $stack_size) - $bss_end + 1;
+
+printf " code ends   at \$%04x\n", ($bss_start - 1);
+printf "  BSS ends   at \$%04x\n", $bss_end;
+printf "stack starts at \$%04x\n", 0xbc20 - $stack_size;
+printf "free code space \$%04x (%d, %.1fK)\n", $free, $free, $free / 1024;