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porting: floating point exceptions

--- a/porting.md

+++ b/porting.md

@@ -80,6 +80,12 @@

 You could copy it from APE (`/sys/src/ape`) or just roll out your own.

+### Floating point exceptions

+

+By default, Plan 9 has various exceptions enabled.  Try

+`setfcr(getfcr() & ~(FPINVAL|FPOVFL))` in `main` function before

+running any of the ported logic.

+

 ### Some weird stuff with types/signatures not matching during linking

 This is probably caused by the compiler getting confused with forward