Repeat: Difference between revisions
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Puppydrum64 (talk | contribs) |
Puppydrum64 (talk | contribs) |
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<lang z80>trampoline: |
<lang z80>trampoline: |
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jp (hl) ;despite the parentheses this does NOT dereference HL, it merely acts as "LD PC,HL".</lang> |
jp (hl) ;despite the parentheses this does NOT dereference HL, it merely acts as "LD PC,HL".</lang> |
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===Using self-modifying code=== |
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This method assumes the routine doesn't use the B register, or restores it before returning. Also, the actual "wrapper" used to repeat the passed function must be in RAM so that its instructions can be modified at runtime. |
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LD HL,myFunc |
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LD (repeatproc+1),HL |
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LD B,5 ;repeat count |
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CALL repeatProc |
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;somewhere far away from here: |
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repeatProc: |
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call &0000 ;gets overwritten with the address of MyFunc |
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djnz repeatProc |
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ret</lang> |
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=={{header|zkl}}== |
=={{header|zkl}}== |
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