System Call Instruction

• System call is used to communicate with the operating system, and request services (memory allocation, I/O)

• SPIM supports “system-call-like”

• Load system call code into Register $v0

• Load arguments (if any) into registers $a0, $a1 or $f12 (for floating point).

• do: syscall

• Results returned in registers $v0 or $f0.

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