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Max Freedom Pollard
631ef003e7
RGBASM computes these with unsigned arithmetic and casts back, since signed overflow is UB in C++, but RGBLINK's RPN evaluator used `int32_t` directly, so `src/link/patch.cpp` tripped UBSan on lines 117, 121, and 124. Share the three operators through `opmath.cpp` so both evaluators stay in step.
10 lines
327 B
NASM
10 lines
327 B
NASM
def fzero equs "startof(\"test\")"
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section "test", rom0
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; Signed overflow is undefined behavior, so these must wrap around instead
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dl $7fff_ffff + ({fzero} + 1)
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dl $8000_0000 - ({fzero} + 1)
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dl $7fff_ffff * ({fzero} + 3)
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; XXX: We rely on this landing at address $0000, which isn't *guaranteed*...
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assert startof("test") == 0
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