ARM: zImage: Fix bad SP address after relocating kernel

Otherwise cache_clean_flush can overwrite some of the relocated
area depending on where the kernel image gets loaded. This fixes
booting on n900 after commit 6d7d0ae51574943bf571d269da3243257a2d15db
(ARM: 6750/1: improvements to compressed/head.S).

Thanks to Aaro Koskinen <aaro.koskinen@nokia.com> for debugging
the address of the relocated area that gets corrupted, and to
Nicolas Pitre <nicolas.pitre@linaro.org> for the other uncompress
related fixes.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 84ac4d656310..55a5bcb82ba0 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -253,6 +253,11 @@ restart:	adr	r0, LC0
                 /* Preserve offset to relocated code. */
                 sub     r6, r9, r6
 
+#ifndef CONFIG_ZBOOT_ROM
+                /* cache_clean_flush may use the stack, so relocate it */
+                add     sp, sp, r6
+#endif
+
                 bl      cache_clean_flush
 
                 adr     r0, BSYM(restart)