diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-01-26 09:13:44 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-02-24 14:57:27 +0000 |
| commit | 1e48ef7fcc374051730381a2a05da77eb4eafdb0 (patch) | |
| tree | f7f7174e996accf28dfdeef5fa79a452e4dbfa41 /arch/arm64/Kconfig | |
| parent | 6c94f27ac847ff8ef15b3da5b200574923bd6287 (diff) | |
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/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index c85c29d660bd..fef3dc6e21b9 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -787,6 +787,17 @@ config ARM64_MODULE_PLTS select ARM64_MODULE_CMODEL_LARGE select HAVE_MOD_ARCH_SPECIFIC +config RELOCATABLE + bool + help + This builds the kernel as a Position Independent Executable (PIE), + which retains all relocation metadata required to relocate the + kernel binary at runtime to a different virtual address than the + address it was linked at. + Since AArch64 uses the RELA relocation format, this requires a + relocation pass at runtime even if the kernel is loaded at the + same address it was linked at. + endmenu menu "Boot options" |