Question

我在x64程序集（masm）中编写了一个过程，当代码的执行到达ret语句时，出现此错误：HW04_Q01.exe中的0x00007FF69997AA5C抛出异常：0xC0000005：访问冲突读取位置0xFFFFFFFFFFFFFFFFFF。发生

getSquareRoot proc
.data?
    temp2 complex <>
    a real8 ?
    b real8 ?
    x real8 ?
.data
    zero real8 0.0
    _two real8 2.0
    minusOne real8 -1.0
.code
    movsd xmm0, real8 ptr [rsi]
    movsd xmm1, real8 ptr [rsi + 8]
    movsd a, xmm0
    movsd b, xmm1
    mulsd xmm0, a
    mulsd xmm1, b
    movsd xmm2, xmm0
    addsd xmm2, xmm1
    movsd x, xmm2
    movsd xmm1, b
    _IF:
        ucomisd xmm1, zero
        jb _else 
            movsd xmm0,x
            call sqrt
            addsd xmm0, a
            divsd xmm0, _two
            call sqrt
            movsd temp2.real, xmm0

            movsd xmm0,x
            call sqrt
            movsd xmm1, minusOne
            mulsd xmm1, a
            addsd xmm0, xmm1
            divsd xmm0, _two
            call sqrt
            movsd temp2.imag, xmm0
        jmp _endIf
    _else:
            movsd xmm0,x
            call sqrt
            addsd xmm0, a
            divsd xmm0, _two
            call sqrt
            movsd temp2.real, xmm0

            movsd xmm0,x
            call sqrt
            movsd xmm1, minusOne
            mulsd xmm1, a
            addsd xmm0, xmm1
            divsd xmm0, _two
            call sqrt
            mulsd xmm0, minusOne
            movsd temp2.imag, xmm0
    _endIf:
    movsd xmm0, temp2.real
    movsd xmm1, temp2.imag
ret
getSquareRoot endp

Answer 1

实际上，我将每个对sqrt（）C函数的调用都替换为助记符sqrtsd，因为我处理的所有值都存储在SSE寄存器（xmm0，xmm1，xmm2等）中，并且可以正常工作

HW04_Q01.exe中的0x00007FF69997AA5C引发异常：0xC0000005：访问冲突读取位置0xFFFFFFFFFFFFFFFFFF。发生

1 个答案: