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authorEric W. Biederman <ebiederm@xmission.com>2006-12-07 02:14:04 +0100
committerAndi Kleen <andi@basil.nowhere.org>2006-12-07 02:14:04 +0100
commit968de4f02621db35b8ae5239c8cfc6664fb872d8 (patch)
tree9388da7f18f9511e1bbfeaf934cba8dbc696e9f4 /arch/i386/Makefile
parentfd593d12770d4a0d1ff095d44b96436c18479ee8 (diff)
[PATCH] i386: Relocatable kernel support
This patch modifies the i386 kernel so that if CONFIG_RELOCATABLE is selected it will be able to be loaded at any 4K aligned address below 1G. The technique used is to compile the decompressor with -fPIC and modify it so the decompressor is fully relocatable. For the main kernel relocations are generated. Resulting in a kernel that is relocatable with no runtime overhead and no need to modify the source code. A reserved 32bit word in the parameters has been assigned to serve as a stack so we figure out where are running. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/i386/Makefile')
-rw-r--r--arch/i386/Makefile4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/i386/Makefile b/arch/i386/Makefile
index 0677908dfa0..d1aca52bf69 100644
--- a/arch/i386/Makefile
+++ b/arch/i386/Makefile
@@ -26,7 +26,9 @@ endif
LDFLAGS := -m elf_i386
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
-LDFLAGS_vmlinux :=
+ifdef CONFIG_RELOCATABLE
+LDFLAGS_vmlinux := --emit-relocs
+endif
CHECKFLAGS += -D__i386__
CFLAGS += -pipe -msoft-float