b291538d33
On some platforms asmcgocall can be called with a nil g. Additionally, it can be called when already on a the system (g0) stack or on a signal stack. In these cases we do not need to switch (and/or cannot switch) to the system stack and as a result, do not need to save the g. Rework asmcgocall on ppc64x to follow the pattern used on other architectures, such as amd64 and arm64, where a separate nosave path is called in the above cases. The nil g case will be needed to support openbsd/ppc64. Updates #56001 Change-Id: I431d4200bcbc4aaddeb617aefe18590165ff2927 Reviewed-on: https://go-review.googlesource.com/c/go/+/478775 Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> Reviewed-by: Paul Murphy <murp@ibm.com> Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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