Subroutine memcpy for copying a sequence of bytes

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[M] Write an IA-32 program to solve Problem 2.27 in Chapter 2.

Problem 2.27

[M] Write a subroutine MEMCPY for copying a sequence of bytes from one area in the main memory to another area. The subroutine should accept three input parameters in registers representing the from address, the to address, and the length of the sequence to be copied. The two areas may overlap. In all but one case, the subroutine should copy the bytes in the order of increasing addresses. However, in the case where the to address falls within the sequence of bytes to be copied, i.e., when the to address is between from and from+length-1, the subroutine must copy the bytes in the order of decreasing addresses by starting at the end of the sequence of bytes to be copied in order to avoid overwriting bytes that have not yet been copied.

Reference no: EM131209864

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