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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) 2013 Altera Corporation
Copyright (C) 1994, 95, 96, 2003 by Wind River Systems
Written by Fredrik Markstrom
This file is included by the global makefile so that you can add your own
architecture-specific flags and dependencies.
Nios2 port by Wind River Systems Inc trough:
fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
KBUILD_DEFCONFIG := 3c120_defconfig
UTS_SYSNAME = Linux
export MMU
LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
KBUILD_AFLAGS += -march=r$(CONFIG_NIOS2_ARCH_REVISION)
KBUILD_CFLAGS += -pipe -D__linux__ -D__ELF__ KBUILD_CFLAGS += -march=r$(CONFIG_NIOS2_ARCH_REVISION) KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MUL_SUPPORT),-mhw-mul,-mno-hw-mul) KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MULX_SUPPORT),-mhw-mulx,-mno-hw-mulx) KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_DIV_SUPPORT),-mhw-div,-mno-hw-div) KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_BMX_SUPPORT),-mbmx,-mno-bmx) KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_CDX_SUPPORT),-mcdx,-mno-cdx) KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_FPU_SUPPORT),-mcustom-fpu-cfg=60-1,)
KBUILD_CFLAGS += -fno-optimize-sibling-calls KBUILD_CFLAGS += -DUTS_SYSNAME="$(UTS_SYSNAME)" KBUILD_CFLAGS += -fno-builtin KBUILD_CFLAGS += -G 0
libs-y += arch/nios2/lib/ $(LIBGCC)
INSTALL_PATH ?= /tftpboot nios2-boot := arch/$(ARCH)/boot BOOT_TARGETS = vmImage zImage PHONY += $(BOOT_TARGETS) install KBUILD_IMAGE := $(nios2-boot)/vmImage
all: vmImage
$(BOOT_TARGETS): vmlinux $(Q)$(MAKE) $(build)=$(nios2-boot) $(nios2-boot)/$@
install: $(call cmd,install)
define archhelp echo '* vmImage - Kernel-only image for U-Boot ($(KBUILD_IMAGE))' echo ' install - Install kernel using' echo ' (your) ~/bin/$(INSTALLKERNEL) or' echo ' (distribution) /sbin/$(INSTALLKERNEL) or' echo ' install to $$(INSTALL_PATH)' endef