Commit 3059e1fc authored by Marcus Shawcroft's avatar Marcus Shawcroft Committed by Kumar Gala
Browse files

arm: Refactor cortex-m4 irq_lock tmp handling. 



Replace the use of a hardwired temporary register in the irq_lock()
implementation with a local variable.  This will allow the compiler
more flexibility in register allocation.

Change-Id: Ifbdb52fca1d40404d55934343ac2a8153df7e1a8
Signed-off-by: default avatarMarcus Shawcroft <marcus.shawcroft@arm.com>
parent 70c137d7

include/arch/arm/cortex_m/asm_inline_gcc.h

+6 −4
Original line number Diff line number Diff line
@@ -135,13 +135,15 @@ static ALWAYS_INLINE unsigned int _arch_irq_lock(void) 
		:

		: "memory");

#else /* CONFIG_CPU_CORTEX_M3_M4 */

	unsigned int tmp;



	__asm__ volatile(

		"mov %%r1, %1;\n\t"

		"mov %1, %2;\n\t"

		"mrs %0, BASEPRI;\n\t"

		"msr BASEPRI, %%r1;\n\t"

		: "=r"(key)

		"msr BASEPRI, %1;\n\t"

		: "=r"(key), "=r"(tmp)

		: "i"(_EXC_IRQ_DEFAULT_PRIO)

		: "r1", "memory");

		: "memory");

#endif



	return key;

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