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Prevented infinite loop when asma's output is empty

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Andrew Alderwick 2021-05-16 08:46:03 +01:00
parent 3b9519d945
commit fa91704ef9
1 changed files with 5 additions and 0 deletions
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projects/software/asma.usm
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@ -46,12 +46,17 @@
DEO2 instruction to 0x00ff. In order to execute File/load and have the
CPU continue at memory location 0x0100, we write the final DEO2
instruction there and jump there as our final act.
Just in case the assembled code is zero-length (which can occur when
assembling an empty source file), we write a BRK to the reset vector so
that will prevent an infinite loop.
)
;&dest-file .File/name DEO2
#0000 .File/offset DEO2
#ff00 .File/length DEO2
#0100 .File/load
LIT DEO2 #00ff STA
LIT BRK #0100 STA
#00ff JMP2
&source-file