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In reply to druck:

AIF headers on transient utilities would indeed be wrong, because the design of these headers does not allow return to the calling environment (only termination via OS_Exit).

Fortunately the header required for transient utilities has a more appropriate format (the first word is a branch instruction rather than branch-with-link).

I was not aware of the 'informal lightweight mechanism' that you mention. Was it ever documented anywhere? What was the point of it if it was not enforced?

 is a RISC OS Userthesnark on 3/7/06 5:12PM
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