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[release-branch.go1.18] runtime: fix ppc64 startup on newer linux kernels 

R0 needs to be cleared at startup as it may not always be cleared
by the kernel on newer kernels.

Fixes #54664

Change-Id: Id7055699aaa8d8b193b7e3e784f075ce29ac3f1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/424927
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/425369
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Paul E. Murphy 2022-08-19 09:20:02 -05:00 committed by Heschi Kreinick
parent d2d59299a2
commit da8a350201
1 changed files with 1 additions and 0 deletions
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1
src/runtime/rt0_linux_ppc64.s
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@ -22,6 +22,7 @@ TEXT _main<>(SB),NOSPLIT,$-8
// There is no TLS base pointer.
//
// TODO(austin): Support ABI v1 dynamic linking entry point
XOR R0, R0 // Note, newer kernels may not always set R0 to 0.
MOVD $runtime·rt0_go(SB), R12
MOVD R12, CTR
MOVBZ runtime·iscgo(SB), R5