Search 在MIPS中搜索句子中的单词

我希望你们今天过得愉快。我希望我能在项目代码方面得到一些帮助。基本上，在提示时键入一个句子“淡入淡出”，然后键入一个搜索词“淡出”，并执行代码以查看单词“淡出”是否在句子中，如果是，则会显示“找到x个匹配项”，如果不是“未找到匹配项”。当我编译并运行时，它会给我一个“第65行：0x00400098处的运行时异常：地址超出范围0x00000000”错误，并且有多行有此错误。有人能帮我吗？在过去的三天里，我一直在尝试着去做这件事，最后终于破门而入寻求帮助。。。如果你有任何问题，请告诉我

    .data

    str: .space 100                 # Pre Allocate space for the input sentence
    input: .space 30                # Pre Allocate space for the input sentence 
    ins: .asciiz "Please enter a sentence: "    # string to print sentence
    seek: .asciiz "Please enter a word: "       # string to print sentence 
    nomatch: .asciiz "No Match(es) Found"           
    found: .asciiz " Match(es) Found"
    newline: .asciiz "\n"               # string to print newline

    .text

    li $v0, 4       # syscall to print string
    la $a0, ins     # move str into a0
    syscall         # syscall 

    li $a1, 100     # allocate space for the string
    la $a0, str     # load address of the input string
    li, $v0, 8      # read string input from user
    syscall         # issue a system call

    move $t9, $a0       # move string to t5

    li $v0, 4       # syscall to print string
    la $a0, seek        # move str into a0
    syscall         # syscall 

    la $a0, input       # load address of the input string
    li $a2, 30      # allocate space for the string
    li, $v0, 8      # read string input from user
    syscall         # issue a system call

    move $t8, $a0       # move string to t8
    la $s5, input       # create space for the input word we are looking for in s5

    wloop:          # loop to allocate space for the word we are looking for to a register
    lb $t0, 0($t8)      # load first character into t0
    beqz $t0, sentence  # branch to sentence loop if null character
    sb $t0, 0($s5)      # store the current character into current address of s5
    addi $t8, $t8, 1    # add one to t8 to move to next character
    addi $s5, $s5, 1    # add one to s5 to move to the next allocated space
    j wloop         # jump back to wloop

    la $s4, str     # create space for the input sentence

    sentence:       # loop to allocate space for the word we are looking for into a register
    lb $t0, 0($t9)      # load first character into t0
    beqz $t0, resetsen  # branch to check loop if null character
    sb $t9, 0($s4)      # store the current character into current address of s4
    addi $t9, $t9, 1    # add one to t9 to move to next character
    addi $s4, $s4, 1    # add one to s5 to move to the next allocated space
    j sentence      # jump back to sentence

    resetsen:
    li $s4, 0       # reset sentence back to 0 (first character)

    resetword:
    li $s5, 0       # reset word we are looking for back to 0 (first character)

    check:
    lb $t1, 0($s4)      # load current character of sentence to t1
    beq $t1, 46, quit   # branch to QUIT if period found
    bne $t1, 70, nextword   # if t1 != t0 branch to nextword
    beq $t1, 70, checkword  # branch to found if t1 = f

    nextword:       # loop to get to the next word
    lb $t1, 0($s4)      # load current character to t1
    beq $t1, 46, quit   # branch to quit if period found
    bne $t1, 32, increment  # if current character is not a spaace branch to increment
    beq $t1, 32, plusone    # if current character is a space branch to plusone
    increment:      # increment procedure
    addi $s4, $s4, 1    # add one to s4 to move to next character
    j nextword      # jump to nextword
    plusone:        # plusone procedure
    addi $s4, $s4, 1    # add one to s4 to move to next character
    j resetword     # jump to check

    checkword:
    addi $s4, $s4, 1    # add one to s4 to move to next character
    addi $s5, $s5, 1    # add one to s5 to move to next character
    lb $t1, 0($s4)      # load current character of sentence to t1
    lb $t0, 0($s5)      # load current character of sentence to t0
    bne $t1, $t0, increment # if t0 != t1 branch to increment (looking for a)
    addi $s4, $s4, 1    # add one to s4 to move to next character
    addi $s5, $s5, 1    # add one to s5 to move to next character
    lb $t1, 0($s4)      # load current character of sentence to t1
    lb $t0, 0($s5)      # load current character of sentence to t0
    bne $t1, $t0, increment # if t0 != t1 branch to increment (looking for d)
    addi $s4, $s4, 1    # add one to s4 to move to next character
    addi $s5, $s5, 1    # add one to s5 to move to next character
    lb $t1, 0($s4)      # load current character of sentence to t1
    lb $t0, 0($s5)      # load current character of sentence to t0
    bne $t1, $t0, increment # if t0 != t1 branch to increment (looking for e)
    addi $s4, $s4, 1    # add one to s4 to move to next character
    addi $s5, $s5, 1    # add one to s5 to move to next character
    lb $t1, 0($s4)      # load current character of sentence to t1
    lb $t0, 0($s5)      # load current character of sentence to t0
    bne $t1, $t0, increment # if t0 != t1 branch to increment (looking for d)
    addi $t2, $t2, 1    # add one to t2 which counts occurences
    j resetword

    quit:
    beqz $t2, exit      # if t2 = 0 branch to exit
    li $v0, 1       # syscall to print integer
    move $a0, $t2       # move str into a0
    syscall         # syscall 
    li $v0, 4       # syscall to print string
    la $a0, found       # move found into a0
    syscall         # syscall 
    j endprogram

    exit:
    li $v0, 4       # syscall to print string
    la $a0, nomatch     # move nomatch into a0
    syscall         # syscall 

    endprogram:
    li $v0, 10
    syscall

---

您知道异常发生的地址，因此可以轻松检查SPIM/MARS中对应的代码行。我认为火星甚至会为你突出这一行代码。然后你可以使用单步功能，一步一个脚印地走到那一点，沿途观察寄存器。提示：当您使用寄存器作为基址（即加载/存储指令中的

（）

）时，您需要密切注意您在这些寄存器中输入的值。我明白您的意思，但我不知道如何做到这一点。我会在括号前面加0吗？加0是指当你在模拟器中按一个键/点击一个按钮时，一个接一个地执行程序中的指令。这样更容易理解代码中发生的事情。好的，谢谢，我会研究一下，看看我能做些什么。我一直在自学这种语言，这让我头疼！哈哈，谢谢你！