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According to the Procedure Call Standard for the ARM Architecture (AAPCS) - ABI r2.09 [1], §5.2.1.2, the stack pointer must be double-word-aligned at a public interface. The stack implementation being full-descending, this requires that the top of stack be double-word-aligned too. [1] http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: