ARM: Align stack to 8 bytes
The ARM ABI requires that the stack be aligned to 8 bytes as it is noted
in Procedure Call Standard for the ARM Architecture:
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/index.html
Unaligned SP also causes the problem with variable-length arrays
allocation when VLA address becomes less than stack pointer during
aligning of this address, so the next 'push' in the stack overwrites
first 4 bytes of VLA.
Signed-off-by: Vitaly Kuzmichev <vkuzmichev@mvista.com>
diff --git a/arch/arm/cpu/arm_cortexa8/start.S b/arch/arm/cpu/arm_cortexa8/start.S
index 29dae2f..1e0a150 100644
--- a/arch/arm/cpu/arm_cortexa8/start.S
+++ b/arch/arm/cpu/arm_cortexa8/start.S
@@ -164,7 +164,7 @@
sub r0, r0, #(CONFIG_STACKSIZE_IRQ + CONFIG_STACKSIZE_FIQ)
#endif
sub sp, r0, #12 @ leave 3 words for abort-stack
- and sp, sp, #~7 @ 8 byte alinged for (ldr/str)d
+ bic sp, sp, #7 @ 8-byte alignment for ABI compliance
/* Clear BSS (if any). Is below tx (watch load addr - need space) */
clear_bss:
