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The call to svs_lwp_switch can clobber %rdi/%rsi, so restore them before

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calling speculation_barrier.
This commit is contained in:
maxv 2018-03-28 19:56:40 +00:00
parent 25792f64b1
commit 22cad5de7b
1 changed files with 5 additions and 1 deletions
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6
sys/arch/amd64/amd64/locore.S
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@ -1,4 +1,4 @@
/* $NetBSD: locore.S,v 1.160 2018/03/28 16:02:49 maxv Exp $ */
/* $NetBSD: locore.S,v 1.161 2018/03/28 19:56:40 maxv Exp $ */
/*
* Copyright-o-rama!
@ -1096,6 +1096,10 @@ ENTRY(cpu_switchto)
callq _C_LABEL(svs_lwp_switch)
.Lskip_svs:
popq %rdx
/* Restore rdi/rsi for speculation_barrier */
movq %r13,%rdi
movq %r12,%rsi
#endif
pushq %rdx