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| author | Matt Redfearn <matt.redfearn@imgtec.com> | 2016-03-31 10:05:35 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-05-13 14:02:02 +0200 |
| commit | e818fac595ab94900f0046baba1f1a0e2d5c2435 (patch) | |
| tree | 41880085a058084706ef751924d22c8e3abbb016 | |
| parent | 069fd766271de65ec4dc2eb8d15f7f44727b1ea1 (diff) | |
| download | linux-e818fac595ab94900f0046baba1f1a0e2d5c2435.tar.bz2 | |
MIPS: Generate relocation table when CONFIG_RELOCATABLE
When CONFIG_RELOCATABLE is enabled (added in later patch) add
--emit-relocs to vmlinux LDFLAGS so that fully linked vmlinux contains
relocation information.
Run the previously added relocs tool to fill in the .data.relocs section
of vmlinux with a table of relocations. The relocs tool will also remove
(mark as 0 length) the relocation sections added to vmlinux.
When vmlinux is passed to the boot makefile for conversion into a boot
image the now empty relocation sections will be removed and the
populated relocation table will be included in the binary image.
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: kernel-hardening@lists.openwall.com
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12983/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/Makefile | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile index a61031e7c06f..c0b002a09bef 100644 --- a/arch/mips/Makefile +++ b/arch/mips/Makefile @@ -96,6 +96,10 @@ LDFLAGS_vmlinux += -G 0 -static -n -nostdlib KBUILD_AFLAGS_MODULE += -mlong-calls KBUILD_CFLAGS_MODULE += -mlong-calls +ifeq ($(CONFIG_RELOCATABLE),y) +LDFLAGS_vmlinux += --emit-relocs +endif + # # pass -msoft-float to GAS if it supports it. However on newer binutils # (specifically newer than 2.24.51.20140728) we then also need to explicitly @@ -313,6 +317,10 @@ rom.bin rom.sw: vmlinux $(bootvars-y) $@ endif +CMD_RELOCS = arch/mips/boot/tools/relocs +quiet_cmd_relocs = RELOCS $< + cmd_relocs = $(CMD_RELOCS) $< + # # Some machines like the Indy need 32-bit ELF binaries for booting purposes. # Other need ECOFF, so we build a 32-bit ELF binary for them which we then @@ -321,6 +329,11 @@ endif quiet_cmd_32 = OBJCOPY $@ cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@ vmlinux.32: vmlinux +ifeq ($(CONFIG_RELOCATABLE)$(CONFIG_64BIT),yy) +# Currently, objcopy fails to handle the relocations in the elf64 +# So the relocs tool must be run here to remove them first + $(call cmd,relocs) +endif $(call cmd,32) # @@ -336,6 +349,9 @@ all: $(all-y) # boot $(boot-y): $(vmlinux-32) FORCE +ifeq ($(CONFIG_RELOCATABLE)$(CONFIG_32BIT),yy) + $(call cmd,relocs) +endif $(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) \ $(bootvars-y) arch/mips/boot/$@ |