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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>
This commit is contained in:
Matt Redfearn 2016-03-31 10:05:35 +01:00 committed by Ralf Baechle
parent 069fd76627
commit e818fac595
1 changed files with 16 additions and 0 deletions
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16
arch/mips/Makefile
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@ -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) \
$(bootvars-y) arch/mips/boot/$@