Question

程序以预期输出运行，但错误低于

代码

.data

.text
.globl main
main: 
  addi $t0, $t0, 0    # i = 0
  addi $t2, $0, 10    # n = 10
  j WhileCond         # goto WhileCond

  WhileLoop:
    li $v0, 1         # print_int
    move $a0, $t0     # $a0 = i (print i)
    addi $t0, $t0, 1
    syscall

  WhileCond:
    blt $t0, $t2, WhileLoop # if i < 10 goto WhileLoop

  j $ra

用户文字细分

[00400000] 21080000  addi $8, $8, 0           ; 10: addi $t0, $t0, 0 # i = 0 
[00400004] 200a000a  addi $10, $0, 10         ; 11: addi $t2, $0, 10 # n = 10 
[00400008] 08100007  j 0x0040001c [WhileCond] ; 12: j WhileCond # goto WhileCond 
[0040000c] 34020001  ori $2, $0, 1            ; 15: li $v0, 1 # print_int 
[00400010] 00082021  addu $4, $0, $8          ; 16: move $a0, $t0 # $a0 = i (print i) 
[00400014] 21080001  addi $8, $8, 1           ; 17: addi $t0, $t0, 1 
[00400018] 0000000c  syscall                  ; 18: syscall 
[0040001c] 010a082a  slt $1, $8, $10          ; 21: blt $t0, $t2, WhileLoop # if i 
[00400020] 1420fffb  bne $1, $0, -20 [WhileLoop-0x00400020] 
[00400024] 03e00008  jr $31                   ; 23: j $ra

错误

Exception occurred at PC=0x00000000
  Bad address in text read: 0x00000000
Instruction references undefined symbol at 0x800001dc
  [0x800001dc] 0x143a0000  bne $1, $26, 0 [ok_pc-0x800001d8]

Answer 1

addi $t0, $t0, 0    # i = 0

不会将$t0设置为0，而是保持不变。（move $t0, $zero）或（addi $t0, $0, 0）都可以。

您还确定系统调用中保留了$t0和$t2吗？

最后，您发布的错误似乎未出现在您的代码中。你有一个堆栈跟踪/转储寄存器或其他任何可能有助于跟踪它的东西吗？

这个MIPS / QtSPIM循环码有什么问题

1 个答案: