编写汇编程序合并逆序数组时触发SIGSEGV段错误求助

需要编写x86汇编程序，将两个逆序排序的数组合并为一个新的逆序排序数组。现有代码运行时触发SIGSEGV（段错误），错误发生在elementArray1Greater标签处。曾怀疑leal 4(%ecx), %ecx指令导致问题，但移除该指令后仍报错。已获取objdump指令信息及寄存器状态，请求协助排查故障。

汇编代码 #

.global _start
.section .data
 array1: .int 6,4,0
 array2: .int 5,3,0
 mergedArray: .zero 20
.section .text
_start:
    # set up the input array pointers
    leal array1, %eax   # pointer to the first element of array1
    leal array2, %ebx   # pointer to the first element of array2
    # set up the output array pointer
    leal mergedArray, %ecx   # pointer to the first element of output_array
    # set up the loop counters
    movl $0, %edx    # counter for array1
    movl $0, %esi    # counter for array2

loop:
    # compare the current elements of the two arrays
    movl (%eax,%edx,4), %edi   # load the current element of array1 into %edi
    movl (%ebx,%esi,4), %ebp   # load the current element of array2 into %ebp
    cmpl %edi, %ebp            # compare the two elements
    jg elementArray1Greater    # if the element from array1 is greater than the element from array1, add it to the output array
    jl elementArray2Greater    # if the element from array2 is greater than the element from array2, add it to the output array
    jmp equal   

elementArray1Greater:
     movl %edi, (%ecx,%edx,4)   # add the current element of array1 to the output array
     leal 4(%ecx), %ecx
     addl $4, %edx              # advance the counter for array1
     jmp loop

elementArray2Greater:
     movl %ebp, (%ecx,%esi,4)   # add the current element of array2 to the output array
     leal 4(%ecx), %ecx
     addl $4, %esi              # advance the counter for array2
     jmp loop

equal:  cmpl $0, %edi
        je finish
        movl %edi, (%ecx,%edx,4)   # add the current element of array1 to the output array
        leal 4(%ecx), %ecx
        addl $4, %edx
        addl $4, %esi
        jmp loop 

finish:     movl %ebp, (%ecx,%esi,4)   # add the current element of array2 to the output array
    # exit
    movl $0, %eax
    movl $1, %ebx
    int $0x80

错误信息 #

Program received signal SIGSEGV, Segmentation fault.
0x00000000004000df in elementArray1Greater ()

内容的提问来源于stack exchange，提问作者Algo