Re: [ECOS] where can I find the assebly language manual used in thecoding..

[Jonathan Larmour <jifl at eCosCentric dot com>]

Nick Garnett wrote:
> Jonathan Larmour <jifl@eCosCentric.com> writes:
> > Obviously you can also look at the "info gas" stuff as Gary says, but
> > general stuff about the IA32 instruction set is at e.g. for pentium
> > http://developer.intel.com/design/intarch/pentium/docs_pentium.htm
> > and similarly you can hunt around the AMD site.
>
>
> Those pages would not be a great help since GAS implements the AT&T
> syntax rather than the Intel syntax.

GAS now supports both actually. Albeit it with a ".intel_syntax" directive.

> However to anyone familiar with
> Intel syntax, AT&T syntax should be easy to pick up -- I certainly
> never had any difficulty.
>
> The main differences are:
>
> - source and destination operands are in reverse order.
>
> - The size of a transfer is encoded as a "b", "w" or "l" suffix on the
>   opcode, not inferred from the operands.
>
> - The general syntax of addressing modes is offset(base_reg,index_reg,scale) 
>   with elements omitted if they are not needed.
>
> - Some of the more obscure opcodes are named slightly differently.

info gas even has a page on the differences :-).

Jifl
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