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>
1.5 KiB
SPDX-License-Identifier: GPL-2.0-only
OBJCOPYFLAGS :=-O binary GZFLAGS :=-9
ifdef CONFIG_CPU_HAS_FPU FPUEXT = f endif
ifdef CONFIG_CPU_HAS_VDSP VDSPEXT = v endif
ifdef CONFIG_CPU_HAS_TEE TEEEXT = t endif
ifdef CONFIG_CPU_CK610 CPUTYPE = ck610 CSKYABI = abiv1 endif
ifdef CONFIG_CPU_CK810 CPUTYPE = ck810 CSKYABI = abiv2 endif
ifdef CONFIG_CPU_CK807 CPUTYPE = ck807 CSKYABI = abiv2 endif
ifdef CONFIG_CPU_CK860 CPUTYPE = ck860 CSKYABI = abiv2 endif
ifneq ($(CSKYABI),) MCPU_STR = $(CPUTYPE)$(FPUEXT)$(VDSPEXT)$(TEEEXT) KBUILD_CFLAGS += -mcpu=$(CPUTYPE) -Wa,-mcpu=$(MCPU_STR) KBUILD_CFLAGS += -DCSKYCPU_DEF_NAME="$(MCPU_STR)" KBUILD_CFLAGS += -msoft-float -mdiv KBUILD_CFLAGS += -fno-tree-vectorize endif
KBUILD_CFLAGS += -pipe ifeq ($(CSKYABI),abiv2) KBUILD_CFLAGS += -mno-stack-size endif
ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -mbacktrace endif
abidirs := $(patsubst %,arch/csky/%/,$(CSKYABI)) KBUILD_CFLAGS += $(patsubst %,-I$(srctree)/%inc,$(abidirs))
KBUILD_CPPFLAGS += -mlittle-endian LDFLAGS += -EL
KBUILD_AFLAGS += $(KBUILD_CFLAGS)
core-y += arch/csky/$(CSKYABI)/
libs-y += arch/csky/lib/
$(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
boot := arch/csky/boot
all: zImage
zImage Image uImage: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
define archhelp echo '* zImage - Compressed kernel image (arch/$(ARCH)/boot/zImage)' echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' echo ' uImage - U-Boot wrapped zImage' endef