From 3a96ad851f4f9267e1199b700cb838a77334e4b2 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sun, 11 Apr 2010 08:53:55 +0200 Subject: PXA: Align stack to 8 bytes Part of this patch is by: Mikhail Kshevetskiy. Stack must be aligned to 8 bytes on PXA (possibly all armv5te) for LDRD/STRD instructions. In case LDRD/STRD is issued on an unaligned address, the behaviour is undefined. The issue was observed when working with the NAND code, which was rendered disfunctional. Also, the vsprintf() function had serious problems with printing 64bit wide long longs. After aligning the stack, this wrong behaviour is no longer present. Tested on: Marvell Littleton PXA310 board Toradex Colibri PXA320 board Aeronix Zipit Z2 PXA270 handheld Voipac PXA270 board Signed-off-by: Marek Vasut --- arch/arm/cpu/pxa/start.S | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm/cpu/pxa/start.S b/arch/arm/cpu/pxa/start.S index 63ab0c591a..3989fa61bc 100644 --- a/arch/arm/cpu/pxa/start.S +++ b/arch/arm/cpu/pxa/start.S @@ -140,7 +140,10 @@ stack_setup: #ifdef CONFIG_USE_IRQ sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ) #endif /* CONFIG_USE_IRQ */ - sub sp, r0, #12 /* leave 3 words for abort-stack */ + sub r0, r0, #12 /* leave 3 words for abort-stack */ + bic sp, r0, #7 /* NOTE: stack MUST be aligned to */ + /* 8 bytes in case we want to use */ + /* 64bit datatypes (eg. VSPRINTF64) */ clear_bss: ldr r0, _bss_start /* find start of bss segment */ -- cgit v1.2.3