On 3/13/22 21:09, Warner Losh wrote:
Oh? Out of paranoia, how can I verify that this is the case when compiled on
FreeBSD?
Perhaps the atomic sequence FreeBSD uses differs a little from Linux and we
don't trigger
that code?
$ objdump -dr libqemu-arm-*-user.fa.p/accel_tcg_user-exec.c.o
0000000000001490 <helper_atomic_cmpxchgl_le>:
...
14b7: e8 04 ec ff ff callq c0
<atomic_mmu_lookup.constprop.0>
14bc: 48 89 c2 mov %rax,%rdx
14bf: 44 89 e0 mov %r12d,%eax
14c2: f0 44 0f b1 32 lock cmpxchg %r14d,(%rdx)
r~
