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

…nels 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 <[email protected]> Reviewed-by: Lynn Boger <[email protected]> Reviewed-by: Cherry Mui <[email protected]> Reviewed-by: David Chase <[email protected]> Run-TryBot: Paul Murphy <[email protected]> Reviewed-on: https://go-review.googlesource.com/c/go/+/425369 Reviewed-by: Ian Lance Taylor <[email protected]>
golang · Aug 31, 2022 · da8a350 · da8a350
1 parent d2d5929
commit da8a350
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/runtime/rt0_linux_ppc64.s b/src/runtime/rt0_linux_ppc64.s
@@ -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