组装AT＆T语法：我收到“分段错误（核心已转储）”

Question

我对汇编语言还是陌生的。我正在尝试在汇编中实现pow()函数。该函数具有两个变量，它正在计算基数和指数的幂。我仅使用乘法来完成此操作。但是出于某些奇怪的原因，我得到了Segmentation fault (core dumped)。我假设我正在尝试访问一些我不应该访问的内存地址，但是已经有两天了，我无法弄清。

这是我的代码：

.data
formatstr: .asciz "%ld\n"
formatstr_scanf: .asciz "%ld"
user_instructions: .asciz "Please enter two POSITIVE integers for the base and the exponent(respectivly)\n"

.global main

main:
        movq  %rsp , %rbp     # Initialize base pointers
        movq  $0, %rax        # Set %rax to 0
        movq  $user_instructions, %rdi
        call  printf



        call  pow           # Call subroutine inout

        movq  %rax, %rsi
        movq  $0, %rax      # reset rax
        movq  $formatstr, %rdi # save formatstr to rdi so that it's printed first
        call  printf           # Print the First argument (%rdi)
        call  end

pow:                        # Creating subroutine inout
        pushq %rbp            # Pushing the %rbp to the stack
        movq  %rsp, %rbp      # "Creating" new stack for the subroutinne

        subq  $16, %rsp        # Reverse stack space for variable

        leaq  -8(%rbp), %rsi  # Load address of stack var in rsi
        movq  $formatstr_scanf, %rdi  # string formationg the first element for scanf
        movq  $0, %rax
        call  scanf           # call scanf

        leaq  -16(%rbp), %rsi  # Load address of stack var in rsi
        movq  $formatstr_scanf, %rdi  # string formationg the firs element for scanf
        movq  $0, %rax
        call  scanf           # call scanf

        movq  $1, %rbx
loop1:
        cmpq  %rbx, -16(%rbp)
        je    endloop
        inc   %rbx
        mulq  -8(%rbp)
        jmp   loop1

endloop:
        movq  -8(%rbp), %rax    # Put the number for return
        movq  %rbp, %rsp        # Put the stack abck to normal
        popq  %rbp              # move base pointer back to the top of the stack
        ret

end:
        mov   $0, %rdi        # load program exit code
        call  exit            # exit the program

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