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authorEugeniy Paltsev2019-01-16 14:29:50 +0300
committerVineet Gupta2019-02-21 11:03:15 -0800
commit252f6e8eae909bc075a1b1e3b9efb095ae4c0b56 (patch)
tree71cd3352389d5a4fe7b95832f6911a8e7450fc46 /arch/arc
parentf17b5f06cb92ef2250513a1e154c47b78df07d40 (diff)
ARCv2: Enable unaligned access in early ASM code
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]
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/kernel/head.S10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S
index 8b90d25a15cc..26e33a8b2d18 100644
--- a/arch/arc/kernel/head.S
+++ b/arch/arc/kernel/head.S
@@ -17,6 +17,7 @@
#include <asm/entry.h>
#include <asm/arcregs.h>
#include <asm/cache.h>
+#include <asm/irqflags.h>
.macro CPU_EARLY_SETUP
@@ -47,6 +48,15 @@
sr r5, [ARC_REG_DC_CTRL]
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
.section .init.text, "ax",@progbits