Question

我正在尝试使用MIPS在字符串数组中逐个打印字符。但它只打印系统调用。请帮忙

.text
main:
    la $a0, myarray
    li $v0, 4
    syscall

    lbu $t0,0($a0)
    lbu $t1,0($a0)
    lbu $t2,0($a0)
    lbu $t3,0($a0)

    jr $ra
    .data
    myarray:.asciiz "Hello\n"

Answer 1

这绝对可以用更简洁的方式完成，但我希望你明白这个想法！

.data
     myarray: .asciiz    "Hello\n"
     newline: .asciiz     "\n"
.text 
main:
     la $a0, myarray        #load address of original string
     li $v0, 4                #syscall for print string
     syscall

     la $s1, myarray        #save base address of string
     lb $a0, ($s1)         #load 1st char byte as arg
     jal printchar           #print char and return

     addi $s1, $s1, 1         #increment address to next char byte
     lb $a0, ($s1)         #load 2nd char byte as arg
     jal printchar           #print char and return

     addi $s1, $s1, 1     #increment address to next char byte
     lb $a0, ($s1)         #load 3rd char byte as arg
     jal printchar           #print char and return

     addi $s1, $s1, 1         #increment address to next char byte
     lb $a0, ($s1)         #load 4th char byte as arg
     jal printchar           #print char and return

     addi $s1, $s1, 1         #increment address to next char byte
     lb $a0, ($s1)         #load 5th char byte as arg
     jal printchar           #print char and return

     li $v0, 10            #syscall for exit
     syscall

printchar:                #expects that charater byte is loaded into $a0
     li $v0, 11            #syscall for printchar
     syscall

     la $a0, newline        #load address of new line string
     li $v0, 4             #syscall for print string
     syscall

     jr $ra                #return to main

无法获得以下MIPS汇编代码的输出

1 个答案: