Assembly x86: Copy data from register into memory location

Question

I'm having a simple problem copying a char from register al into a variable called ErrorChars...

Do I have to dereference the destination as [ErrorChars]? Is this a decent solution to scanning a buffer, finding the errored chars within the buffer, and placing them in a string, so that I can print them as one item?

 SECTION .data ; Section containing initialized data ErrorChars: db "", 10 ErrorCharsLen: equ $-ErrorChars ; ... mov al, byte [ebp+ecx] ; copy current byte of Buffer into al mov byte ErrorChars, [al] ; copy byte at al into ErrorChars

Jens Björnhager · Accepted Answer · 2013-09-30 01:14:47Z

mov byte ErrorChars, [al] ; copy byte at al into ErrorChars

ErrorChars is your memory operand, not al. So yes, it should be in brackets and not al.

mov [ErrorChars], al ; copy byte in al into ErrorChars

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