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3.6 Special Instructions
There are three special instructions used for software traps. The instruction format is R-type for all three.
Table 3-11. Special instructions
(a) SYSCALL
Instruction Format and Description
System Call SYSCALL code
Raise a system call exception, passing control to an exception handler.
(b) BREAK
Instruction Format and Description
Breakpoint BREAK code
Raise a breakpoint exception, passing control to an exception handler.
(c) SDBBP
Instruction Format and Description
Software
Debug
Breakpoint
SDBBP code
Raise a debug exception, passing control to an exception processor.
funct
funct
funct
code
code
code
op
op
op