MIPS Assembly Language Programming

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4.4. THE <strong>MIPS</strong> INSTRUCTION SET 63 4.4.4.3 Data Movement The data movement instructions move data among registers. Special instructions are provided to move data in and out of special registers such as hi and lo. Op Operands Description ◦ move des, src1 Copy the contents of src1 to des. mfhi des Copy the contents of the hi register to des. mflo des Copy the contents of the lo register to des. mthi src1 Copy the contents of the src1 to hi. mtlo src1 Copy the contents of the src1 to lo. 4.4.5 Exception Handling Op Operands Description rfe Return from exception. syscall Makes a system call. See 4.6.1 for a list of the SPIM system calls. break const Used by the debugger. nop An instruction which has no effect (other than taking a cycle to execute).
64 CHAPTER 4. THE <strong>MIPS</strong> R2000 INSTRUCTION SET 4.5 The SPIM Assembler 4.5.1 Segment and Linker Directives Name Parameters Description .data addr The following items are to be assembled into the data segment. By default, begin at the next available address in the data segment. If the optional argument addr is present, then begin at addr. .text addr The following items are to be assembled into the text segment. By default, begin at the next available address in the text segment. If the optional argument addr is present, then begin at addr. In SPIM, the only items that can be assembled into the text segment are instructions and words (via the .word directive). .kdata addr The kernel data segment. Like the data segment, but used by the Operating System. .ktext addr The kernel text segment. Like the text segment, but used by the Operating System. .extern sym size Declare as global the label sym, and declare that it is size bytes in length (this information can be used by the assembler). .globl sym Declare as global the label sym.
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