cvs commit: src/gnu/usr.bin/gdb/libgdb fbsd-threads.c
emaste at FreeBSD.org
Tue Feb 20 18:10:13 UTC 2007
emaste 2007-02-20 18:10:13 UTC
FreeBSD src repository
Avoid writing uninitialized stack data into a thread's MMX/SSE state by
first getting the current state with td_thr_getxmmregs_p. Without this,
debugging a threaded app that uses libthr resulted in kernel panics or
spurious SIGFPEs for me.
(As of revision 1.6, sys/i386/i386/ptrace_machdep.c masks off the
reserved bits in the mxcsr register, which prevents the kernel panics.)
Architectures without PT_GETXMMREGS are not affected.
MFC after: 1 week
Revision Changes Path
1.16 +12 -7 src/gnu/usr.bin/gdb/libgdb/fbsd-threads.c
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