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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>
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ceseo authored and laboger committed Aug 10, 2017
1 parent 98031d8 commit 9aea0e89b6df032c29d0add8d69ba2c95f1106d9
Showing with 1 addition and 0 deletions.
  1. +1 −0 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

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