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Computer Architecture Discussion

Computer Architecture Discussion. Lecture # 1 SPIM & MIPS Programming. SPIM. SPIM is a MIPS32 simulator that reads and executes assembly language program written for SPIM. Platform -Unix, Linux, Mac OS X, and Microsoft Windows The homepage of SPIM:

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Computer Architecture Discussion

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  1. Computer Architecture Discussion Lecture # 1 SPIM & MIPS Programming

  2. SPIM • SPIM is a MIPS32 simulator that reads and executes assembly language program written for SPIM. • Platform -Unix, Linux, Mac OS X, and Microsoft Windows • The homepage of SPIM: http://pages.cs.wisc.edu/~larus/spim.html

  3. Install SPIM

  4. Start SPIM

  5. SPIM

  6. SPIM When PCSpim starts up, it brings up a large window on your screen .The application window is divided into four parts: 1-The top section is the menu bar. The menu bar allows you to select File operations, set Simulator settings, select Windows views, and obtain online Help information. 2-The next section below the menu bar is the toolbar. The toolbar provides quick mouse access to many tools used in PCSpim for Windows.

  7. SPIM 3- The large section in the middle of the application window is the window display section. There are four display windows: Registers, Text Segment, Data Segment, and Messages. To change the view of these four windows, you can select a tiled view from the menu bar: Windows->Tile. All of the displaywindows will be empty when you first execute the program. The following list describes each display window. • The Register window: display shows the values of all registers in the MIPS CPU and FPU. • The Text Segment window : display shows instructions both from your program and the systemcode that is loaded automatically when PCSpim is running. • The Data Segment window :display shows the data loaded into your program’s memory and the data of the program’s stack. • The Messages window : display is the where PCSpim uses to write messages. This is where error messages appear.

  8. SPIM 4- The Status bar section is at the bottom of the application window. The status bar provides information and the current settings of the simulator.

  9. MIPS Assembly Language • Operations code: • add, sub, addi, addu, addiu, subu • lw, sw, lbu, sb, lui, ori • beq, bne, slt, slti, sltu • j , jr, jal

  10. Assembler Syntax • Comments : in assembler files begin with a sharp-sign (#). • Identifers : are a sequence of alphanumeric characters, underbars ( _ ), and dots (.) that do not begin with a number. • Opcodes : for instructions are reserved words that are not valid identifers. • Labels : are declared by putting them at the beginning of a line followed by a colon.

  11. Assembler Syntax (cont.)

  12. Data Types • .word, .half -32/16 bit integer • .byte -8 bit integer • .ascii, .asciiz -string • .double, .float -floating point • .space n Allocate n bytes of space in the current segment (which must be the data segment in SPIM).

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