diff mbox series

[v4,16/23] microblaze: Remove _start symbol handling at U-Boot start

Message ID 044b727c33dfbe662f68512d0da0775a4805f360.1655299267.git.michal.simek@amd.com
State Accepted
Commit b6fe10afe99c708a1dbb2d01be084aca32521651
Delegated to: Michal Simek
Headers show
Series microblaze: Add support for full relocation | expand

Commit Message

Michal Simek June 15, 2022, 1:21 p.m. UTC 
Right now U-Boot runs all the time from the same address where it is loaded
but going to full relocation code starting address doesn't need to be fixed
and can be simply discovered from reading PC register. That's why use r20
to get PC address and subtract offset from the beginning to get starting
address.

Signed-off-by: Michal Simek <michal.simek@amd.com>
---

(no changes since v1)

 arch/microblaze/cpu/start.S | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S
index c3d925c1d151..db3998f54505 100644
--- a/arch/microblaze/cpu/start.S
+++ b/arch/microblaze/cpu/start.S
@@ -14,15 +14,16 @@ 
 	.global _start
 _start:
 	mts	rmsr, r0	/* disable cache */
+	mfs	r20, rpc
+	addi	r20, r20, -4
 
 	mts	rslr, r0
-	addi	r8, r0, _start
-	mts	rshr, r8
+	mts	rshr, r20
 
 #if defined(CONFIG_SPL_BUILD)
 	addi	r1, r0, CONFIG_SPL_STACK_ADDR
 #else
-	add	r1, r0, r8
+	add	r1, r0, r20
 #endif
 
 	addi	r1, r1, -4	/* Decrement SP to top of memory */