- MIPS指令知识的学习：
- 书本:《计算机组成原理》
- 网络：
- 环境配置
- 从fpt://ftp.cs.wisc.edu目录PUB/SPIM中下载SPIM
- 运行pcspim.exe解压缩文件
- 在解压缩后的文件夹中运行SETUP.EXE安装
- 转到安装目录下运行pcspim.exe
- 模拟器界面：
- 按照MIPS指令规则编写汇编代码，（后缀名使用asm，s）用PCSpim打开运行。
- 程序结构学习（从hello world开始）
- 源代码(hello.asm)
1: # author : See-See 2: # text segment 3: .text 4: .globl main 5: main: # execution starts here6: la $a0,str # put string address into a0
7: li $v0,4 # system call to print8: syscall # out a string
9: li $v0,10 10: syscall # exit 11: #data segment 12: .data13: str: .asciiz "hello world\n"
- 效果图
- 程序设计实例
- 输出实例
- 源代码
1: # author : lijian 2: # date: 2012-01-04 21:00:30 3: # function: use mips output 4: 5: .data 6: # variable declarations here7: msg: .asciiz "\nthis is a message to show!\n" #declared for string
8: inter: .word 168 #declared a interger 9: char: .byte 'a' #declared a character
10: 11: 12: .text 13: main: # indicates start of code 14: 15: # show interger 16: li $v0, 1 # $v0 <= 1 17: lw $a0, inter # $a0 <= inter 18: syscall19: # show string
20: li $v0, 4 # $v0 <= 4 21: la $a0, msg # $a0 <= msg 22: syscall 23: 24: li $v0, 10 #system call code for exit = 10
25: syscall #call operating system to exit- 效果图
- 输入实例
- 源代码
1: # author : lijian 2: # date: 2012-01-04 21:35:31 3: # function: use mips input 4: 5: .data 6: # variable declarations here 7: msg: .space 40 #allocate 40 consecutive bytes,8: msg1: .asciiz "\ninput a integer: " # declared for string
9: msg2: .asciiz "\ninput a string: " # declared for string
10: msg3: .asciiz "\nyou input: " # declared for string
11: .text 12: main: # indicates start of code 13: 14: # input integer 15: li $v0, 4 16: la $a0, msg1 17: syscall 18: li $v0, 5 #read integer 19: syscall 20: move $a1, $v0 21: li $v0, 4 22: la $a0, msg3 23: syscall 24: li $v0, 1 25: move $a0, $a1 26: syscall 27: 28: li $v0, 4 29: la $a0, msg2 30: syscall 31: li $v0, 8 32: la $a0, msg 33: li $a1, 40 34: syscall 35: 36: li $v0, 4 37: la $a0, msg 38: syscall 39: 40: li $v0, 10 #system call code for exit = 10
41: syscall #call operating system to exit- 效果图
- 代数式运算
- 源代码
1: # author : lijian 2: # date: 2012-01-04 22:09:55 3: # fuction: use mips to count 4: 5: .data6: newline: .asciiz "\n"
7: line: .asciiz "****************************\n"
8: head: .asciiz " count numbers \n"
9: author: .asciiz " author : lijian \n"
10: version: .asciiz " version: 0.1 \n"
11: first: .asciiz "input the first num: "
12: second: .asciiz "input the second num: "
13: addString: .asciiz " + "
14: subString: .asciiz " - "
15: mulString: .asciiz " * "
16: divString: .asciiz " / "
17: equalString: .asciiz " = "
18: 19: .text 20: main: 21: # show menu 22: li $v0, 4 23: la $a0, line 24: syscall 25: li $v0, 4 26: la $a0, head 27: syscall 28: li $v0, 4 29: la $a0, newline 30: syscall 31: li $v0, 4 32: la $a0, author 33: syscall 34: li $v0, 4 35: la $a0, version 36: syscall 37: li $v0, 4 38: la $a0, line 39: # input first num 40: syscall 41: li $v0, 4 42: la $a0, first 43: syscall 44: li $v0, 5 45: syscall 46: move $s0, $v0 47: # input second num 48: li $v0, 4 49: la $a0, second 50: syscall 51: li $v0, 5 52: syscall 53: move $s1, $v0 54: # show add result 55: li $v0, 1 56: move $a0, $s0 57: syscall 58: li $v0, 4 59: la $a0, addString 60: syscall 61: li $v0, 1 62: move $a0, $s1 63: syscall 64: li $v0, 4 65: la $a0, equalString 66: syscall 67: 68: add $a0, $s0, $s1 69: li $v0, 1 70: syscall 71: li $v0, 4 72: la $a0, newline 73: syscall 74: 75: # show sub result 76: li $v0, 1 77: move $a0, $s0 78: syscall 79: li $v0, 4 80: la $a0, subString 81: syscall 82: li $v0, 1 83: move $a0, $s1 84: syscall 85: li $v0, 4 86: la $a0, equalString 87: syscall 88: 89: sub $a0, $s0, $s1 90: li $v0, 1 91: syscall 92: li $v0, 4 93: la $a0, newline 94: syscall 95: 96: # show mul result 97: li $v0, 1 98: move $a0, $s0 99: syscall 100: li $v0, 4 101: la $a0, mulString 102: syscall 103: li $v0, 1 104: move $a0, $s1 105: syscall 106: li $v0, 4 107: la $a0, equalString 108: syscall 109: 110: mul $a0, $s0, $s1 111: li $v0, 1 112: syscall 113: li $v0, 4 114: la $a0, newline 115: syscall 116: 117: # show div result 118: li $v0, 1 119: move $a0, $s0 120: syscall 121: li $v0, 4 122: la $a0, divString 123: syscall 124: li $v0, 1 125: move $a0, $s1 126: syscall 127: li $v0, 4 128: la $a0, equalString 129: syscall 130: 131: div $a0, $s0, $s1 132: li $v0, 1 133: syscall 134: li $v0, 4 135: la $a0, newline 136: syscall 137: 138: li $v0, 10 #system call code for exit = 10
139: syscall #call operating system to exit- 效果图
- 求最大数，和
- 源代码
1: # author : lijian 2: # data: 2012-01-04 22:38:01 3: # function: find the max num and count the total 4: 5: .data 6: array: .space 12 #allocate 12 consecutive bytes7: msg1: .asciiz "input the 3 integers(each num end of [enter]): \n"
8: msg2: .asciiz "the max num is: "
9: msg3: .asciiz "the tatal is: "
10: newline: .asciiz "\n"
11: 12: .text 13: main: 14: 15: la $t0, array 16: li $v0, 4 17: la $a0, msg1 18: syscall 19: li $v0, 5 20: syscall 21: sw $v0,($t0) # store the first num 22: li $v0, 5 23: syscall 24: sw $v0,4($t0) # stroe the second num 25: li $v0, 5 26: syscall 27: sw $v0,8($t0) # store the third num 28: 29: lw $s0, ($t0) # get the first num 30: lw $s1, 4($t0) # get the second num 31: lw $s2, 8($t0) # get the third num 32: 33: add $s3, $s0, $s134: add $s4, $s2, $s3 # total stored in $s4
35: li $v0, 4 36: la $a0, msg3 37: syscall 38: li $v0, 1 39: move $a0, $s4 40: syscall 41: li $v0, 4 42: la $a0, newline 43: syscall 44: 45: blt $s0, $s1,num2 46: move $s3, $s0 47: j num3 48: num2: 49: move $s3, $s1 50: num3: 51: bge $s3, $s2, num4 52: move $s3, $s2 53: num4: 54: li $v0, 4 55: la $a0, msg2 56: syscall 57: li $v0, 1 58: move $a0, $s3 59: syscall 60: li $v0, 4 61: la $a0, newline 62: syscall 63: 64: li $v0, 10 #system call code for exit = 10
65: syscall #call operating system to exit- 效果图
