[DO NOT MERGE v5 01/37] sh: passing FDT address to kernel startup.

Yoshinori Sato
2023-12-05T10:13:04Z

R4 is caller saved in SH ABI.
Save it so it doesn't get corrupted until it's needed for initialization.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
arch/sh/boot/compressed/head_32.S | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/sh/boot/compressed/head_32.S b/arch/sh/boot/compressed/head_32.S
index 7bb168133dbb..6be59851122e 100644
--- a/arch/sh/boot/compressed/head_32.S
+++ b/arch/sh/boot/compressed/head_32.S
@@ -15,7 +15,8 @@ startup:
/* Load initial status register */
mov.l init_sr, r1
ldc r1, sr
-
+ /* Save FDT address */
+ mov r4, r13
/* Move myself to proper location if necessary */
mova 1f, r0
mov.l 1f, r2
@@ -84,7 +85,7 @@ l1:
/* Jump to the start of the decompressed kernel */
mov.l kernel_start_addr, r0
jmp @r0
- nop
+ mov r13, r4

.align 2
bss_start_addr:
--
2.39.2