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>
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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.
Copyright (C) 2001 - 2005 Tensilica Inc.
Copyright (C) 2014 Cadence Design Systems Inc.
This file is included by the global makefile so that you can add your own
architecture-specific flags and dependencies.
Core configuration.
(Use VAR=<xtensa_config> to use another default compiler.)
variant-y := $(CONFIG_XTENSA_VARIANT_NAME)
VARIANT = $(variant-y)
ifneq ($(VARIANT),) ifdef cross_compiling ifndef CROSS_COMPILE CROSS_COMPILE = xtensa_$(VARIANT)- endif endif endif
Platform configuration
platform-$(CONFIG_XTENSA_PLATFORM_XT2000) := xt2000 platform-$(CONFIG_XTENSA_PLATFORM_ISS) := iss platform-$(CONFIG_XTENSA_PLATFORM_XTFPGA) := xtfpga
temporarily until string.h is fixed
KBUILD_CFLAGS += -ffreestanding -D__linux__ KBUILD_CFLAGS += -pipe -mlongcalls -mtext-section-literals KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,) KBUILD_CFLAGS += $(call cc-option,-mno-serialize-volatile,) ifneq ($(CONFIG_KERNEL_ABI_CALL0),) KBUILD_CFLAGS += -mabi=call0 KBUILD_AFLAGS += -mabi=call0 endif
KBUILD_AFLAGS += -mlongcalls -mtext-section-literals
ifneq ($(CONFIG_LD_NO_RELAX),) KBUILD_LDFLAGS := --no-relax endif
CHECKFLAGS += -D$(if $(CONFIG_CPU_BIG_ENDIAN),XTENSA_EB,XTENSA_EL)
vardirs := $(patsubst %,arch/xtensa/variants/%/,$(variant-y)) plfdirs := $(patsubst %,arch/xtensa/platforms/%/,$(platform-y))
KBUILD_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(vardirs) $(plfdirs))
KBUILD_DEFCONFIG := iss_defconfig
libs-y += arch/xtensa/lib/
boot := arch/xtensa/boot
all Image zImage uImage xipImage: vmlinux $(Q)$(MAKE) $(build)=$(boot) $@
archheaders: $(Q)$(MAKE) $(build)=arch/xtensa/kernel/syscalls all
define archhelp @echo '* Image - Kernel ELF image with reset vector' @echo '* zImage - Compressed kernel image (arch/xtensa/boot/images/zImage.)' @echo ' uImage - U-Boot wrapped image' @echo ' xipImage - XIP image' endef