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Cliff Biffle  committed 4be4eed

Fixed YIELD to become a no-op if executed in a handler. This is a bit of a hack, but we were getting hard-faults when doing serial I/O from handler code because of the SVC.

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  • Parent commits 763c182

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           bx W                @ Jump directly, do not alter return address.
 
 DEF tYIELD, "YIELD"
+          mrs W, IPSR         @ Check interrupt status.
+          cbnz W, 1f          @ If servicing an interrupt, don't SVC.
           svc 0
-          NEXT
+1:        NEXT
 
 DEF tDROPMINUSPRIVS, "DROP-PRIVS"
           mrs W, CONTROL