x86 mov to/from segment registers

[H. J. Lu]

On Mon, Nov 21, 2005 at 07:45:33PM -0500, Josh Vanderhoof wrote:
> It has just been brought to my attention that something I wrote
> (sf.net/projects/lrmi) is not compiling on Fedora Core development
> (gcc 4.0.2, binutils 2.16.91.0.3).  The problem is with inline asms
> like this:
> 
>         asm volatile ("movl %%gs, %0" : "=rm" (old_gs));
>         asm volatile ("movl %0, %%gs" :: "rm" (old_gs));
> 
> Apparently changing the "movl" to "mov" makes it compile.  What is the
> correct way to get a segment register move without a size prefix?

Read the current Linux binutils release note at

http://www.kernel.org/pub/linux/devel/binutils/


H.J.