[2/9] ARM: zImage: Fix bad SP address after relocating kernel

Message ID 1304031024-5121-3-git-send-email-nico@fluxnic.net
State New
Headers show

Commit Message

Nicolas Pitre April 28, 2011, 10:50 p.m.
From: Tony Lindgren <tony@atomide.com>

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>
 arch/arm/boot/compressed/head.S |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)


diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 84ac4d6..55a5bcb 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
+		/* cache_clean_flush may use the stack, so relocate it */
+		add	sp, sp, r6
 		bl	cache_clean_flush
 		adr	r0, BSYM(restart)