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