From 5b2f9c244dd71d2896f2bfca9a61c91f49f0251e Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 22 Jun 2020 17:09:55 +0200
Subject: [PATCH] cores/cpu/microwatt: revert setup stack and fix missing subi 
 %r1,%r1,0x100 (thanks ozbenh).

Tested with powerpc64le-buildroot-linux-gnu-gcc.br_real (Buildroot 2020.02-00011-g7ea8a52) 8.4.0.
---
 litex/soc/cores/cpu/microwatt/crt0.S | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/litex/soc/cores/cpu/microwatt/crt0.S b/litex/soc/cores/cpu/microwatt/crt0.S
index 5fc295f1b..cfd670170 100644
--- a/litex/soc/cores/cpu/microwatt/crt0.S
+++ b/litex/soc/cores/cpu/microwatt/crt0.S
@@ -76,10 +76,9 @@ _start:
 	bdnz	0b
 1:
 	/* setup stack */
-	LOAD_IMM64(%r1, _fstack - 0x100)
-	LOAD_IMM64(%r12, main)
-	mtctr	%r12,
-	bctrl
+	ld	%r1,_fstack@got(%r2)
+	subi  %r1,%r1,0x100
+	bl	main
 	b .
 
 #define EXCEPTION(nr)		\