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SBCL Internals

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On the non-x86 ports (at least PowerPC and Sparc, I haven't looked elsewhere), the LRA is an other-pointer, i.e. it doesn't have a lowtag of its own. That means it needs to point to a header word, which is the Return PC Header. So when a label is emitted that will be used as LRA, it in fact points to a header word (something like 0xXXa6 ). The instruction to return to is the next word, and XX is the number of words to the beginning of the code object, shifted 16 bits.

This page is linked from: Calling Convention  

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