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Previously, it was impossible to cross-compile Collapse OS from a binary-offsetted Collapse OS because stable ABI wordrefs would have a wrongly offsetted address. This solves the problem by replacing those wordrefs by direct, hardcoded stable ABI offset references.
17 lines
791 B
Plaintext
17 lines
791 B
Plaintext
Stable wordrefs are there for more complicated reasons. When
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cross-compiling Collapse OS, we use immediate words from the
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host and some of them compile wordrefs (IF compiles (?br),
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LOOP compiles (loop), etc.). These compiled wordref need to
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be stable across binaries, so they're part of the stable ABI.
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Another layer of complexity is the fact that some binaries
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don't begin at offset 0. In that case, the stable ABI doesn't
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begin at 0 either. The EXECUTE word has a special handling of
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those case where any wordref < 0x100 has the binary offset
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applied to it.
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But that's not the end of our problems. If an offsetted binary
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cross compiles a binary with a different offset, stable ABI
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references will be > 0x100 and be broken.
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(cont.)
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