ce697ccee1
Kbuild puts the objects listed in head-y at the head of vmlinux. Conventionally, we do this for head*.S, which contains the kernel entry point. A counter approach is to control the section order by the linker script. Actually, the code marked as __HEAD goes into the ".head.text" section, which is placed before the normal ".text" section. I do not know if both of them are needed. From the build system perspective, head-y is not mandatory. If you can achieve the proper code placement by the linker script only, it would be cleaner. I collected the current head-y objects into head-object-list.txt. It is a whitelist. My hope is it will be reduced in the long run. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
7.2 KiB
arch/sh/Makefile
Copyright (C) 1999 Kaz Kojima
Copyright (C) 2002 - 2008 Paul Mundt
Copyright (C) 2002 M. R. Brown
This file is subject to the terms and conditions of the GNU General Public
License. See the file "COPYING" in the main directory of this archive
for more details.
ifdef cross_compiling ifeq ($(CROSS_COMPILE),) CROSS_COMPILE := $(call cc-cross-prefix, sh-linux- sh-linux-gnu- sh-unknown-linux-gnu-) endif endif
KBUILD_DEFCONFIG := shx3_defconfig
isa-y := any isa-$(CONFIG_SH_DSP) := sh isa-$(CONFIG_CPU_SH2) := sh2 isa-$(CONFIG_CPU_SH2A) := sh2a isa-$(CONFIG_CPU_SH3) := sh3 isa-$(CONFIG_CPU_SH4) := sh4 isa-$(CONFIG_CPU_SH4A) := sh4a isa-$(CONFIG_CPU_SH4AL_DSP) := sh4al
isa-$(CONFIG_SH_DSP) := $(isa-y)-dsp isa-y := $(isa-y)-up
cflags-$(CONFIG_CPU_SH2) := $(call cc-option,-m2,)
cflags-$(CONFIG_CPU_J2) += $(call cc-option,-mj2,)
cflags-$(CONFIG_CPU_SH2A) += $(call cc-option,-m2a,)
$(call cc-option,-m2a-nofpu,)
$(call cc-option,-m4-nofpu,)
cflags-$(CONFIG_CPU_SH3) := $(call cc-option,-m3,)
cflags-$(CONFIG_CPU_SH4) := $(call cc-option,-m4,)
$(call cc-option,-mno-implicit-fp,-m4-nofpu)
cflags-$(CONFIG_CPU_SH4A) += $(call cc-option,-m4a,)
$(call cc-option,-m4a-nofpu,)
cflags-$(CONFIG_CPU_SH4AL_DSP) += $(call cc-option,-m4al,)
ifeq ($(cflags-y),)
In the case where we are stuck with a compiler that has been uselessly
restricted to a particular ISA, a favourite default of newer GCCs when
extensive multilib targets are not provided, ensure we get the best fit
regarding FP generation. This is intentionally stupid (albeit many
orders of magnitude less than GCC's default behaviour), as anything
with a large number of multilib targets better have been built
correctly for the target in mind.
cflags-y += $(shell $(CC) $(KBUILD_CFLAGS) -print-multi-lib |
grep nofpu | sed q | sed -e 's/^/-/;s/;.*$$//')
At this point, anything goes.
isaflags-y := $(call as-option,-Wa$(comma)-isa=any,) else
-Wa,-isa= tuning implies -Wa,-dsp for the versions of binutils that
support it, while -Wa,-dsp by itself limits the range of usable opcodes
on certain CPU subtypes. Try the ISA variant first, and if that fails,
fall back on -Wa,-dsp for the old binutils versions. Even without DSP
opcodes, we always want the best ISA tuning the version of binutils
will provide.
isaflags-y := $(call as-option,-Wa$(comma)-isa=$(isa-y),)
isaflags-$(CONFIG_SH_DSP) :=
$(call as-option,-Wa$(comma)-isa=$(isa-y),-Wa$(comma)-dsp)
endif
cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mb cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -ml
cflags-y += $(call cc-option,-mno-fdpic) cflags-y += $(isaflags-y) -ffreestanding
OBJCOPYFLAGS := -O binary -R .note -R .note.gnu.build-id -R .comment
-R .stab -R .stabstr -S
Give the various platforms the opportunity to set default image types
defaultimage-y := zImage defaultimage-$(CONFIG_SH_SH7785LCR) := uImage defaultimage-$(CONFIG_SH_RSK) := uImage defaultimage-$(CONFIG_SH_URQUELL) := uImage defaultimage-$(CONFIG_SH_MIGOR) := uImage defaultimage-$(CONFIG_SH_AP325RXA) := uImage defaultimage-$(CONFIG_SH_SH7757LCR) := uImage defaultimage-$(CONFIG_SH_7724_SOLUTION_ENGINE) := uImage defaultimage-$(CONFIG_SH_7206_SOLUTION_ENGINE) := vmlinux defaultimage-$(CONFIG_SH_7619_SOLUTION_ENGINE) := vmlinux
Set some sensible Kbuild defaults
boot := arch/sh/boot KBUILD_IMAGE := $(boot)/$(defaultimage-y)
Choosing incompatible machines durings configuration will result in
error messages during linking.
UTS_MACHINE := sh LDFLAGS_vmlinux += -e _stext
ifdef CONFIG_CPU_LITTLE_ENDIAN ld-bfd := elf32-sh-linux LDFLAGS_vmlinux += --defsym jiffies=jiffies_64 --oformat $(ld-bfd) KBUILD_LDFLAGS += -EL else ld-bfd := elf32-shbig-linux LDFLAGS_vmlinux += --defsym jiffies=jiffies_64+4 --oformat $(ld-bfd) KBUILD_LDFLAGS += -EB endif
export ld-bfd
Mach groups
machdir-$(CONFIG_SOLUTION_ENGINE) += mach-se machdir-$(CONFIG_SH_HP6XX) += mach-hp6xx machdir-$(CONFIG_SH_DREAMCAST) += mach-dreamcast machdir-$(CONFIG_SH_SH03) += mach-sh03 machdir-$(CONFIG_SH_RTS7751R2D) += mach-r2d machdir-$(CONFIG_SH_HIGHLANDER) += mach-highlander machdir-$(CONFIG_SH_MIGOR) += mach-migor machdir-$(CONFIG_SH_AP325RXA) += mach-ap325rxa machdir-$(CONFIG_SH_KFR2R09) += mach-kfr2r09 machdir-$(CONFIG_SH_ECOVEC) += mach-ecovec24 machdir-$(CONFIG_SH_SDK7780) += mach-sdk7780 machdir-$(CONFIG_SH_SDK7786) += mach-sdk7786 machdir-$(CONFIG_SH_X3PROTO) += mach-x3proto machdir-$(CONFIG_SH_SH7763RDP) += mach-sh7763rdp machdir-$(CONFIG_SH_SH4202_MICRODEV) += mach-microdev machdir-$(CONFIG_SH_LANDISK) += mach-landisk machdir-$(CONFIG_SH_LBOX_RE2) += mach-lboxre2 machdir-$(CONFIG_SH_RSK) += mach-rsk
ifneq ($(machdir-y),)
core-y += $(addprefix arch/sh/boards/,
$(filter-out ., $(patsubst %,%/,$(machdir-y))))
endif
Common machine type headers. Not part of the arch/sh/boards/ hierarchy.
machdir-y += mach-common
Companion chips
core-$(CONFIG_HD6446X_SERIES) += arch/sh/cchips/hd6446x/
CPU header paths
These are ordered by optimization level. A CPU family that is a subset
of another (ie, SH-2A / SH-2), is picked up first, with increasing
levels of genericness if nothing more suitable is situated in the
hierarchy.
As an example, in order of preference, SH-2A > SH-2 > common definitions.
cpuincdir-$(CONFIG_CPU_SH2A) += cpu-sh2a cpuincdir-$(CONFIG_CPU_SH2) += cpu-sh2 cpuincdir-$(CONFIG_CPU_SH3) += cpu-sh3 cpuincdir-$(CONFIG_CPU_SH4A) += cpu-sh4a cpuincdir-$(CONFIG_CPU_SH4) += cpu-sh4 cpuincdir-y += cpu-common # Must be last
drivers-y += arch/sh/drivers/
cflags-y += $(foreach d, $(cpuincdir-y), -I $(srctree)/arch/sh/include/$(d))
$(foreach d, $(machdir-y), -I $(srctree)/arch/sh/include/$(d))
KBUILD_CFLAGS += -pipe $(cflags-y) KBUILD_CPPFLAGS += $(cflags-y) KBUILD_AFLAGS += $(cflags-y)
ifeq ($(CONFIG_MCOUNT),y) KBUILD_CFLAGS += -pg endif
ifeq ($(CONFIG_DWARF_UNWINDER),y) KBUILD_CFLAGS += -fasynchronous-unwind-tables endif
libs-y := arch/sh/lib/ $(libs-y)
BOOT_TARGETS = uImage uImage.bz2 uImage.gz uImage.lzma uImage.xz uImage.lzo
uImage.srec uImage.bin zImage vmlinux.bin vmlinux.srec
romImage
PHONY += $(BOOT_TARGETS)
all: $(notdir $(KBUILD_IMAGE))
$(BOOT_TARGETS): vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
compressed: zImage
archprepare: $(Q)$(MAKE) $(build)=arch/sh/tools include/generated/machtypes.h
archheaders: $(Q)$(MAKE) $(build)=arch/sh/kernel/syscalls all
define archhelp @echo ' zImage - Compressed kernel image' @echo ' romImage - Compressed ROM image, if supported' @echo ' vmlinux.srec - Create an ELF S-record' @echo ' vmlinux.bin - Create an uncompressed binary image' @echo '* uImage - Alias to bootable U-Boot image' @echo ' uImage.srec - Create an S-record for U-Boot' @echo ' uImage.bin - Kernel-only image for U-Boot (bin)' @echo '* uImage.gz - Kernel-only image for U-Boot (gzip)' @echo ' uImage.bz2 - Kernel-only image for U-Boot (bzip2)' @echo ' uImage.lzma - Kernel-only image for U-Boot (lzma)' @echo ' uImage.xz - Kernel-only image for U-Boot (xz)' @echo ' uImage.lzo - Kernel-only image for U-Boot (lzo)' endef