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authorKees Cook <keescook@chromium.org>2013-07-08 09:15:17 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2013-08-07 21:00:04 -0700
commita02150610776f66b40257624822a879311592bb2 (patch)
treea14370b350bfead0b692d2b6a4b74f426c17024d /arch/x86/Makefile
parentc095ba7224d8edc71dcef0d655911399a8bd4a3f (diff)
x86, relocs: Move ELF relocation handling to C
Moves the relocation handling into C, after decompression. This requires that the decompressed size is passed to the decompression routine as well so that relocations can be found. Only kernels that need relocation support will use the code (currently just x86_32), but this is laying the ground work for 64-bit using it in support of KASLR. Based on work by Neill Clift and Michael Davidson. Signed-off-by: Kees Cook <keescook@chromium.org> Link: http://lkml.kernel.org/r/20130708161517.GA4832@www.outflux.net Acked-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/Makefile')
-rw-r--r--arch/x86/Makefile8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 07639c656fcd..41250fb33985 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -16,6 +16,10 @@ endif
# e.g.: obj-y += foo_$(BITS).o
export BITS
+ifdef CONFIG_X86_NEED_RELOCS
+ LDFLAGS_vmlinux := --emit-relocs
+endif
+
ifeq ($(CONFIG_X86_32),y)
BITS := 32
UTS_MACHINE := i386
@@ -25,10 +29,6 @@ ifeq ($(CONFIG_X86_32),y)
KBUILD_AFLAGS += $(biarch)
KBUILD_CFLAGS += $(biarch)
- ifdef CONFIG_RELOCATABLE
- LDFLAGS_vmlinux := --emit-relocs
- endif
-
KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
# Never want PIC in a 32-bit kernel, prevent breakage with GCC built