Valgrind does appear to be aware of sysarch, implementing
sysarch(AMD64_SET_FSBASE) in
coregrind/m_syswrap/syswrap-amd64-freebsd.c.
Aha. eglibc is testing that the syscall succeeds, which is indicated by
setting RAX to 0.
The standard kernel in a success case sets RAX to zero
and clears carry flag. In error case the carry flag is set
and RAX contains error number.
It probably should be
SET_STATUS_Success2((0L, tst->arch.vex.guest_RDX );
Petr
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