arm64: add KASAN support

[deliverable/linux.git] / arch / arm64 / Makefile

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index f9914d7c1bb00b5c4cbe7a19c0f62c8eca54cf81..f41c6761ec36017224a99bf0fd89a4d354a2c685 100644 (file)
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -55,6 +55,13 @@ else
 TEXT_OFFSET := 0x00080000
 endif
 
+# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
+# in 32-bit arithmetic
+KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
+                       (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
+                       + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
+                       - (1 << (64 - 32 - 3)) )) )
+
 export TEXT_OFFSET GZFLAGS
 
 core-y         += arch/arm64/kernel/ arch/arm64/mm/