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Re: breakpoints/1321: GDB: problem with FPU
- From: Mark Kettenis <kettenis at chello dot nl>
- To: nobody at sources dot redhat dot com
- Cc: gdb-prs at sources dot redhat dot com,
- Date: 4 Jan 2004 10:38:00 -0000
- Subject: Re: breakpoints/1321: GDB: problem with FPU
- Reply-to: Mark Kettenis <kettenis at chello dot nl>
The following reply was made to PR breakpoints/1321; it has been noted by GNATS.
From: Mark Kettenis <kettenis@chello.nl>
To: gdb-gnats@sources.redhat.com, miwako.tokugawa@intel.com, sana@stl.sarov.ru
Cc:
Subject: Re: breakpoints/1321: GDB: problem with FPU
Date: Sun, 4 Jan 2004 11:35:04 +0100 (CET)
I'm fairly certain this problem is related to the lack of support for
FXSAVE/SSE in libthread_db on Linux. As a result the SSE and FPU
registers don't get passed along correctly between the different
layers when debugging threaded programs. Consequently you're looking
at stale FPU registers or FPU registers from a different thread. The
problem will probably go away when debugging on an older machine that
doesn't have the SSE registers.
We can't fix this until someone adds the necessary bits to
libthread_db, which can be found in glibc.
Mark