Assembly 0x00400014处的运行时异常：地址超出范围0x7fbffffc

我试图编写一个递归函数来打印从1到X的数字，但我得到了这个错误，特别是在

sw$a0,0（$sp）

处

---

我已经创建了两个版本的程序。一个带有bug注释的。和一个清理和工作的版本。请原谅这种免费的清洁方式

以下是注释版本：

    .data

    .text

    # Getting user input
    li      $v0,5
    syscall
    move    $a0,$v0

# NOTE/BUG: doing fallthrough to PrintUp -- needs "jal PrintUp"

PrintUp:
    addi    $sp,$sp,-8              # make a stack for two element
    sw      $ra,4($sp)              # save the address
    sw      $a0,0($sp)              # save the argument

# NOTE/BUG: $t0 never set to anything -- should this be $a0?
    beq     $t0,0,EqZero            # if X=0, go to EqZero

# NOTE/BUG: does not restore $ra/$a0
    addi    $sp,$sp,8               # pop the elements
    jr      $ra                     # return

EqZero:
    addi    $a0,$a0,-1              # decrement i

    jal     PrintUp                 # call the recursive function

    lw      $a0,0($sp)

# NOTE/BUG: this should be $ra and not $a0
    lw      $a0,4($sp)
    addi    $sp,$sp,8               # pop the elements

# NOTE/BUG: this will only print the zero value
    li      $v0,1
    syscall

    jr      $ra                     # return

    .data
nl:         .asciiz     "\n"

    .text
    .globl  main
main:

    # Getting user input
    li      $v0,5
    syscall
    move    $a0,$v0

    jal     PrintUp

    # exit program
    li      $v0,10
    syscall

PrintUp:
    addi    $sp,$sp,-8              # make a stack for two element
    sw      $ra,4($sp)              # save the address
    sw      $a0,0($sp)              # save the argument

    bne     $a0,0,NeZero            # if X!=0, go to NeZero

    addi    $sp,$sp,8               # pop the elements
    jr      $ra                     # return

NeZero:
    addi    $a0,$a0,-1              # decrement i

    jal     PrintUp                 # call the recursive function

    lw      $a0,0($sp)
    lw      $ra,4($sp)
    addi    $sp,$sp,8               # pop the elements

    li      $v0,1
    syscall
    move    $t0,$a0

    li      $v0,4
    la      $a0,nl
    syscall

    move    $a0,$t0
    jr      $ra                     # return

---

以下是更正的版本：

    .data

    .text

    # Getting user input
    li      $v0,5
    syscall
    move    $a0,$v0

# NOTE/BUG: doing fallthrough to PrintUp -- needs "jal PrintUp"

PrintUp:
    addi    $sp,$sp,-8              # make a stack for two element
    sw      $ra,4($sp)              # save the address
    sw      $a0,0($sp)              # save the argument

# NOTE/BUG: $t0 never set to anything -- should this be $a0?
    beq     $t0,0,EqZero            # if X=0, go to EqZero

# NOTE/BUG: does not restore $ra/$a0
    addi    $sp,$sp,8               # pop the elements
    jr      $ra                     # return

EqZero:
    addi    $a0,$a0,-1              # decrement i

    jal     PrintUp                 # call the recursive function

    lw      $a0,0($sp)

# NOTE/BUG: this should be $ra and not $a0
    lw      $a0,4($sp)
    addi    $sp,$sp,8               # pop the elements

# NOTE/BUG: this will only print the zero value
    li      $v0,1
    syscall

    jr      $ra                     # return

    .data
nl:         .asciiz     "\n"

    .text
    .globl  main
main:

    # Getting user input
    li      $v0,5
    syscall
    move    $a0,$v0

    jal     PrintUp

    # exit program
    li      $v0,10
    syscall

PrintUp:
    addi    $sp,$sp,-8              # make a stack for two element
    sw      $ra,4($sp)              # save the address
    sw      $a0,0($sp)              # save the argument

    bne     $a0,0,NeZero            # if X!=0, go to NeZero

    addi    $sp,$sp,8               # pop the elements
    jr      $ra                     # return

NeZero:
    addi    $a0,$a0,-1              # decrement i

    jal     PrintUp                 # call the recursive function

    lw      $a0,0($sp)
    lw      $ra,4($sp)
    addi    $sp,$sp,8               # pop the elements

    li      $v0,1
    syscall
    move    $t0,$a0

    li      $v0,4
    la      $a0,nl
    syscall

    move    $a0,$t0
    jr      $ra                     # return

---

使用调试器单步执行代码并查看出错的地方。还要注释您的代码并描述您希望它做什么。提示：您甚至从未更改过

$t0

，因此如果它恰好为零，它将保持为零，并且您将得到无休止的递归。