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Check for underflow #78

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merged 1 commit into from
Jul 8, 2024
Merged

Check for underflow #78

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7 changes: 7 additions & 0 deletions data_stack.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -28,12 +28,19 @@ data_stack_push:

data_stack_pop:
mov rsi, [_data_stack.here]
cmp rsi, [_data_stack.base]
jle .underflow

std
lodsq
mov [_data_stack.here], rsi
lodsq
cld

ret

.underflow:
die ERR_UNDERFLOW

data_stack_depth:
mov rax, [_data_stack.here]
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1 change: 1 addition & 0 deletions defs.inc
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Expand Up @@ -11,6 +11,7 @@ ERR_BAD_BASE = 167
ERR_BAD_PAD = 168
ERR_NO_WORD = 169
ERR_BAD_SE = 170
ERR_UNDERFLOW = 171

TYPE_OFFSET = 0x00

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