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From 9aea0e89b6df032c29d0add8d69ba2c95f1106d9 Mon Sep 17 00:00:00 2001
From: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Date: Thu, 10 Aug 2017 14:48:36 -0300
Subject: [PATCH] runtime: make sure R0 is zero before _main on ppc64le
_main has an early check to verify if a binary is statically or dynamically
linked that depends on R0 being zero. R0 is not guaranteed to be zero at that
point and this was breaking Go on Alpine for ppc64le.
Change-Id: I4a1059ff7fd3db6fc489e7dcfe631c1814dd965b
Reviewed-on: https://go-review.googlesource.com/54730
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
---
src/runtime/rt0_linux_ppc64le.s | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/runtime/rt0_linux_ppc64le.s b/src/runtime/rt0_linux_ppc64le.s
index 134858bff8..73b9ae392d 100644
--- a/src/runtime/rt0_linux_ppc64le.s
+++ b/src/runtime/rt0_linux_ppc64le.s
@@ -2,6 +2,7 @@
#include "textflag.h"
TEXT _rt0_ppc64le_linux(SB),NOSPLIT,$0
+ XOR R0, R0 // Make sure R0 is zero before _main
BR _main<>(SB)
TEXT _rt0_ppc64le_linux_lib(SB),NOSPLIT,$-8
--
2.14.1
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