Assembly “;商店中未对齐的地址”;保存单词时出错

Assembly “;商店中未对齐的地址”;保存单词时出错,assembly,recursion,qtspim,Assembly,Recursion,Qtspim,我正在用汇编语言编写一个程序,每次接受用户输入的一个字符,并使用递归将其插入到按字母顺序排列的字符串中。我已经盯着这个看了很长时间了,但它似乎仍然应该起作用。其他人对此将不胜感激 .data text1: .asciiz "To begin, type a lower case letter.\n" text2: .asciiz "Any time you are prompted for an input, you may type a 'P' to print the

我正在用汇编语言编写一个程序,每次接受用户输入的一个字符,并使用递归将其插入到按字母顺序排列的字符串中。我已经盯着这个看了很长时间了,但它似乎仍然应该起作用。其他人对此将不胜感激

        .data
text1:  .asciiz "To begin, type a lower case letter.\n" 
text2:  .asciiz "Any time you are prompted for an input, you may type a 'P' to print the alphabetized string.\n"
text3:  .asciiz "You can also type 'Q' to end the program.\n\n"
text4:  .asciiz "Input: "
text5:  .asciiz "End."
err:    .asciiz "Something broke\n"
str:    .asciiz "abcdefghijklmnopqrstuvwxyz"
buffer: .space 30
in:     .space 4

        .text
main:   la $a0, text1              #opening statements
        li $v0, 4
        syscall
        la $a0, text2
        syscall
        la $a0, text3
        syscall 

input:  la $a0, text4
        li $v0, 4
        syscall
        li $v0, 12                 #get input character
        syscall
        move $t0, $v0
        li $a0, 0x0a                #print new line
        li $v0, 11  
        syscall

        beq $t0, 0x50, print        #input is 'P'; print out string
        beq $t0, 0x51, end          #input is 'Q'; end

        la $t1, str
search: lb $t2, 0($t1)              #search for the starting location
        beqz $t2, error
        beq $t2, $t0, phase1
        addi $t1, $t1, 1
        j search

phase1: sw $t2, ($sp)           #store the letter on the stack
        sub $sp, $sp, 4     
        sw $t1, ($sp)           #store address of the letter on the stack
        sub $sp, $sp, 4
        addi $t1, $t1, 1        #increment address 
        lb $t2, 0($t1)          #getting next letter to prepare for next loop
        beqz $t2, phase2        #if end of string is reached, come out of loop
        jal phase1
        j input

phase2: lw $ra, ($sp)           #pull return location off stack
        addi $sp, $sp, 4
        lw $t3, ($sp)           #pull letter address off stack
        addi $sp, $sp 4
        lw $t4, ($sp)           #pull letter off stack
        addi $sp, $sp, 4
        addi $t3, $t3, 1        #increment old address to get new address
        sw $t4, 0($t3)          #store the letter in its new location
        jr $ra      

error:  la $a0, err         
        li $v0, 4
        syscall
        j input

print:  la $a0, str
        li $v0, 4
        syscall
        li $a0, 0x0a
        li $v0, 11
        syscall
        j input

end:    la $a0, text5
        li $v0, 4
        syscall
        li $v0, 10
        syscall
具体来说,我在线路上遇到了错误:

sw $t4, 0($t3)
上面写着:“存储区中未对齐的地址:0x100E7”

之后,我得到“异常5[存储区中的地址错误]发生并被忽略”

然后是“发生并忽略异常6[错误指令地址]”的无休止的链


我正在使用QtSpim。

您正在尝试将
单词
写入具有
sw
(存储单词)的非单词对齐地址words长度为4字节,必须在4的倍数上对齐。
您可以通过
sh
(存储半字)将
半字
s存储到半字对齐的位置(地址倍数为2),并通过
sb
字节
s存储到字节对齐的地址(存储字节,这并不奇怪)