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cc2538: Fix stack alignment

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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>
This commit is contained in:
Benoît Thébaudeau 2015-12-12 22:32:45 +01:00
parent 4302e23ddc
commit 5b1457e4ab
1 changed files with 1 additions and 1 deletions
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2
cpu/cc2538/startup-gcc.c
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@ -103,7 +103,7 @@ void uart1_isr(void);
#endif
/*---------------------------------------------------------------------------*/
/* Allocate stack space */
static unsigned long stack[512] __attribute__ ((section(".stack")));
static uint64_t stack[256] __attribute__ ((section(".stack")));
/*---------------------------------------------------------------------------*/
__attribute__((__section__(".vectors")))
void(*const vectors[])(void) =