NEC Network Controller uPD98502 - Manual (Page 569)

APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary User’s Manual S15543EJ1V0UM 569
SYSCALL
System Call
SYSCALL
SPECIAL
0 0 0 0 0 0
Code
31 26 25 6 5 0
6 20
SYSCALL
0 0 1 1 0 0
6
Format:
SYSCALL
Description:
A system call exception occurs, immediately and unconditionally transferring control to the exception handler.
The code field is available for use as software parameters, but is retrieved by the exception handler only by loading
the contents of the memory word containing the instruction.
Operation:
32, 64 T: SystemCallException
Exceptions:
System Call exception