Subject: Re: VFP, PTRACE and ELF
To: None <Richard.Earnshaw@arm.com>
From: Jason R Thorpe <email@example.com>
Date: 02/14/2002 08:49:20
On Thu, Feb 14, 2002 at 11:26:57AM +0000, Richard Earnshaw wrote:
> Before we finally switch the ARM ports to ELF I think we need to decide
> how a process that is using the PTRACE interface should get the VFP
> registers on a machine that has a VFP unit (or emulator) attached.
> Has a similar issue (of modifying the "struct reg" or "struct fpreg"
> layout) come up on other ports? If I add extra space to the end of struct
> fpreg will it break existing applications that try to read or write the
> fpreg structure via ptrace()?
> If so, is there a way to add new calls to the ptrace interface to read and
> write the additional registers?
Look at how the i386 port deals with XMM registers. A similar trick
can be used for ARM VFP.
-- Jason R. Thorpe <firstname.lastname@example.org>