________________________________________ From: linux-assembly-owner@xxxxxxxxxxxxxxx [linux-assembly-owner@xxxxxxxxxxxxxxx] on behalf of horseriver [horserivers@xxxxxxxxx] Sent: Wednesday, February 06, 2013 8:32 PM To: Hendrik Visage Cc: linux-assembly@xxxxxxxxxxxxxxx Subject: Re: mov instruction On Thu, Feb 07, 2013 at 03:57:37PM +0200, Hendrik Visage wrote: > On Thu, Feb 7, 2013 at 5:57 AM, horseriver <horserivers@xxxxxxxxx> wrote: > > hi:) > > > > Is here a suitable place to post topics about hardware technology? > > > > I am curious about how mov work. > > Why it can not move data from a mem adress to another adress in one instruction. > > in this form : mov (eax), (ebx) > > That is what the (rep) movs(b/w) etc. operation(s) are designed for > these "string copy" operations. the old 8086 had those running between > es:di and ds:si as the registers for this. Yeah! I remember that. But why this can not work : mov (eax), (ebx) ? just curious . Because the x86 architecture will not allow you to move (or do arithmetic) from memory to memory. You can only move to/from a register from/to memory. For example, mov (eax), ecx mov ecx, (ebx) (assuming AT&T syntax) --Bob-- To unsubscribe from this list: send the line "unsubscribe linux-assembly" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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