ARCv2: Enable unaligned access in early ASM code (252f6e8e) · Commits · 戴 / test

It is currently done in arc_init_IRQ() which might be too late considering gcc 7.3.1 onwards (GNU 2018.03) generates unaligned memory accesses by default Cc: stable@vger.kernel.org #4.4+ Signed-off-by:

Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by:

Vineet Gupta <vgupta@synopsys.com> [vgupta: rewrote changelog]

arch/arc/kernel/head.S

+10 −0

Original line number	Original line	Diff line number	Diff line
	@@ -17,6 +17,7 @@
	#include <asm/entry.h>		#include <asm/entry.h>
	#include <asm/arcregs.h>		#include <asm/arcregs.h>
	#include <asm/cache.h>		#include <asm/cache.h>
			#include <asm/irqflags.h>

	.macro CPU_EARLY_SETUP		.macro CPU_EARLY_SETUP

	@@ -47,6 +48,15 @@
	sr r5, [ARC_REG_DC_CTRL]		sr r5, [ARC_REG_DC_CTRL]

	1:		1:

			#ifdef CONFIG_ISA_ARCV2
			; Unaligned access is disabled at reset, so re-enable early as
			; gcc 7.3.1 (ARC GNU 2018.03) onwards generates unaligned access
			; by default
			lr r5, [status32]
			bset r5, r5, STATUS_AD_BIT
			kflag r5
			#endif
	.endm		.endm

	.section .init.text, "ax",@progbits		.section .init.text, "ax",@progbits

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