From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Mon, 19 Sep 2011 17:44:51 +0000 (+0000)
Subject: powerpc/powernv: Don't clobber r9 in relative_toc()
X-Git-Tag: firefly_0821_release~3680^2~4178^2~65
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e550592e689cf8d682937f356497f989f3d88292;p=firefly-linux-kernel-4.4.55.git

powerpc/powernv: Don't clobber r9 in relative_toc()

With OPAL, r8 and r9 will be used to pass the OPAL base and entry
for debugging purposes (those informations are also in the
device-tree). We don't want to clobber those registers that
early.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 3564c49c683e..e708abe576d3 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -674,9 +674,9 @@ _GLOBAL(enable_64b_mode)
 _GLOBAL(relative_toc)
 	mflr	r0
 	bcl	20,31,$+4
-0:	mflr	r9
-	ld	r2,(p_toc - 0b)(r9)
-	add	r2,r2,r9
+0:	mflr	r11
+	ld	r2,(p_toc - 0b)(r11)
+	add	r2,r2,r11
 	mtlr	r0
 	blr