From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 22 Jun 2020 09:36:19 +0000 (+0200)
Subject: cores/cpu/microwatt: temporary revert crt0.S/setup stack.
X-Git-Tag: 24jan2021_ls180~168
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=84617b585befbd2d1582bfa108e2e4bf5a68d929;p=litex.git

cores/cpu/microwatt: temporary revert crt0.S/setup stack.

lxsim --cpu-type=microwatt --cpu-variant=standard+ghdl no longer working otherwise.
---

diff --git a/litex/soc/cores/cpu/microwatt/crt0.S b/litex/soc/cores/cpu/microwatt/crt0.S
index 0fc8868e..5fc295f1 100644
--- a/litex/soc/cores/cpu/microwatt/crt0.S
+++ b/litex/soc/cores/cpu/microwatt/crt0.S
@@ -76,9 +76,11 @@ _start:
 	bdnz	0b
 1:
 	/* setup stack */
-	ld	%r1,_fstack@got(%r2)
-	bl	main
-	b	.
+	LOAD_IMM64(%r1, _fstack - 0x100)
+	LOAD_IMM64(%r12, main)
+	mtctr	%r12,
+	bctrl
+	b .
 
 #define EXCEPTION(nr)		\
 	.=  nr;      \