From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 22 Jun 2020 15:09:55 +0000 (+0200)
Subject: cores/cpu/microwatt: revert setup stack and fix missing subi  %r1,%r1,0x100 (thanks... 
X-Git-Tag: 24jan2021_ls180~166
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5b2f9c244dd71d2896f2bfca9a61c91f49f0251e;p=litex.git

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.
---

diff --git a/litex/soc/cores/cpu/microwatt/crt0.S b/litex/soc/cores/cpu/microwatt/crt0.S
index 5fc295f1..cfd67017 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)		\