Stan Sieler ([log in to unmask]) wrote: : R26 is 0 (NIL) : > RCTR=00000000 ISR=00000208 IOR=0000000c IIR=0f581059 IVA=00d67000 : The IIR (Interrupt Instruction Register) has the opcode for : LDHS 12(0,26),25 : So, the code is trying to load at address 12 bytes in from NIL, which : generally isn't desirable. Unless you are running at ring 0, you can't dereference the first page. (Unless this has changed in 5 years.) : because you'd generally see the error *storing* relative to NIL, not loading : from it. : Stan Sieler [log in to unmask] This is the default on HP-UX, linking without -z.