diff options
| author |   kettenis <kettenis@openbsd.org> | 2020-06-30 20:23:56 +0000 |
|---|---|---|
| committer | kettenis <kettenis@openbsd.org> | 2020-06-30 20:23:56 +0000 |
| commit | 73a7763b5d634bd49ccf0dc79ad29aa91b78a915 (patch) | |
| tree | f2998efe59e0827e6a4489e2165e024bd72abdae /sys | |
| parent | Flush OPAL console when writing kernel messages. Removes annoying delay (diff) | |
| download | wireguard-openbsd-73a7763b5d634bd49ccf0dc79ad29aa91b78a915.tar.xz wireguard-openbsd-73a7763b5d634bd49ccf0dc79ad29aa91b78a915.zip | |
Use a lone stdcx. instruction to clear possible userland reservations upon
context switch.
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/powerpc64/powerpc64/locore.S | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/arch/powerpc64/powerpc64/locore.S b/sys/arch/powerpc64/powerpc64/locore.S index 8328d71ae09..4960e79889d 100644 --- a/sys/arch/powerpc64/powerpc64/locore.S +++ b/sys/arch/powerpc64/powerpc64/locore.S @@ -1,4 +1,4 @@ -/* $OpenBSD: locore.S,v 1.26 2020/06/30 20:09:37 kettenis Exp $ */ +/* $OpenBSD: locore.S,v 1.27 2020/06/30 20:23:56 kettenis Exp $ */ /* * Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org> @@ -105,6 +105,10 @@ cpu_switchto_asm: ld %r31, P_ADDR(%r4) std %r31, CI_CURPCB(%r13) ld %r1, PCB_SP(%r31) +#if PCB_SP != 0 + addi %r31, %r31, PCB_SP +#endif + stdcx. %r1, 0, %r31 /* clear a possible reservation */ ld %r31, P_MD_USER_SLB_PA(%r4) std %r31, CI_USER_SLB_PA(%r13) |