40 lines
477 B
ArmAsm
40 lines
477 B
ArmAsm
.define .dup
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! Duplicate top bytes of stack
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! Expects in de-registers: number of bytes to duplicate
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.dup: mov a,e !trap if number is odd
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rar
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cc eoddz
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pop h
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shld .retadr
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mov h,b
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mov l,c
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shld .bcreg
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mov h,d
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mov l,e
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dad sp
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1: dcx h
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mov b,m
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dcx h
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mov c,m
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push b
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dcx d
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dcx d !number of bytes must be a word-multiple i.e. even
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mov a,d
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ora e
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jnz 1b
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lhld .bcreg
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mov b,h
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mov c,l
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lhld .retadr
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pchl
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