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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2016-01-26 09:13:44 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2016-02-24 14:57:27 +0000
commit1e48ef7fcc374051730381a2a05da77eb4eafdb0 (patch)
treef7f7174e996accf28dfdeef5fa79a452e4dbfa41 /arch/arm64/Makefile
parent6c94f27ac847ff8ef15b3da5b200574923bd6287 (diff)
downloadlinux-1e48ef7fcc374051730381a2a05da77eb4eafdb0.tar.gz
arm64: add support for building vmlinux as a relocatable PIE binary
This implements CONFIG_RELOCATABLE, which links the final vmlinux image with a dynamic relocation section, allowing the early boot code to perform a relocation to a different virtual address at runtime. This is a prerequisite for KASLR (CONFIG_RANDOMIZE_BASE). Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Makefile')
-rw-r--r--arch/arm64/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index a6bba9623836..6b5508a17495 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -15,6 +15,10 @@ CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
OBJCOPYFLAGS :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
GZFLAGS :=-9
+ifneq ($(CONFIG_RELOCATABLE),)
+LDFLAGS_vmlinux += -pie
+endif
+
KBUILD_DEFCONFIG := defconfig
# Check for binutils support for specific extensions