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Date: Wed, 28 Dec 2005 00:16:00 -0000
From: Jim Blandy <jimb@red-bean.com>
To: Guillaume POIRIER <poirierg@gmail.com>
Subject: Re: Setting an SSE register to a certain value
Cc: gdb@sources.redhat.com
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On 12/27/05, Guillaume POIRIER <poirierg@gmail.com> wrote:
> I'm trying to find a solution to set an XMM register to a certain value.
>
> I've tried
> set $xmm2 =3D 0x000000000000000000000000FFFFFFFF
> but I get the error message: "Invalid cast."
> and I also tried:
> set $xmm2 =3D (unint128) 0x000000000000000000000000FFFFFFFF
> but I get the message the message "No symbol "uint128" in current context=
."
>
> I've googled around and dig the mailing without finding a solution to
> this problem.

If you say "print $xmm", don't you get a structure type?  GDB is
complaining that it doesn't know how to convert the 128-bit constant
you wrote to the register's structure type.  Try assigning to the
individual elements of one of the structure's members.