(1) Disabled saving/restoring of FPU context in setjmp/longjmp.
(2) Using rodata section for locore messages.
(3) Corrected width of interrupt vector field in INTSTAT register.
(4) Fixed return PC value for execve systam call.
(5) On uart interrupts, calling uartintr() routine for uart1-uart6.
Kernel accounting routines imported from NetBSD 1.0.