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MIPS: Use Makefile.postlink to insert relocations into vmlinux 

When relocatable support for MIPS was merged, there was no support for
an architecture to add a postlink step for vmlinux. This meant that only
invoking a target within the boot directory, such as uImage, caused the
relocations to be inserted into vmlinux. Building just the vmlinux
target would result in a relocatable kernel with no relocation
information present.

Commit fbe6e37dab ("kbuild: add arch specific post-link Makefile")
recified this situation, so MIPS can now define a postlink step to add
relocation information into vmlinux, and remove the additional steps
tacked onto boot targets.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Tested-by: Steven J. Hill <steven.hill@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14554/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Matt Redfearn 2016-11-10 10:02:13 +00:00 committed by Ralf Baechle
parent 096a0de427
commit 44079d3509
2 changed files with 35 additions and 12 deletions
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12
arch/mips/Makefile
View File

@ -330,10 +330,6 @@ 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
@ -342,11 +338,6 @@ quiet_cmd_relocs = RELOCS $<
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)
#
@ -362,9 +353,6 @@ 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) \
$(bootvars-y) arch/mips/boot/$@

35
arch/mips/Makefile.postlink Normal file
View File

@ -0,0 +1,35 @@
# ===========================================================================
# Post-link MIPS pass
# ===========================================================================
#
# 1. Insert relocations into vmlinux
PHONY := __archpost
__archpost:
include include/config/auto.conf
include scripts/Kbuild.include
CMD_RELOCS = arch/mips/boot/tools/relocs
quiet_cmd_relocs = RELOCS $@
cmd_relocs = $(CMD_RELOCS) $@
# `@true` prevents complaint when there is nothing to be done
vmlinux: FORCE
@true
ifeq ($(CONFIG_RELOCATABLE),y)
$(call if_changed,relocs)
endif
%.ko: FORCE
@true
clean:
@true
PHONY += FORCE clean
FORCE:
.PHONY: $(PHONY)