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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>
64 lines
1.6 KiB
Makefile
64 lines
1.6 KiB
Makefile
# BK Id: %F% %I% %G% %U% %#%
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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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#
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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) 1994 by Linus Torvalds
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# Modifications for the OpenRISC architecture:
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# Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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# Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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#
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# Based on:
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# arch/i386/Makefile
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KBUILD_DEFCONFIG := or1ksim_defconfig
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OBJCOPYFLAGS := -O binary -R .note -R .comment -S
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LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
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KBUILD_CFLAGS += -pipe -ffixed-r10 -D__linux__
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KBUILD_CFLAGS += -msfimm -mshftimm
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all: vmlinux.bin
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boot := arch/$(ARCH)/boot
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_MUL),y)
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KBUILD_CFLAGS += $(call cc-option,-mhard-mul)
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else
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KBUILD_CFLAGS += $(call cc-option,-msoft-mul)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_DIV),y)
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KBUILD_CFLAGS += $(call cc-option,-mhard-div)
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else
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KBUILD_CFLAGS += $(call cc-option,-msoft-div)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_CMOV),y)
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KBUILD_CFLAGS += $(call cc-option,-mcmov)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_ROR),y)
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KBUILD_CFLAGS += $(call cc-option,-mror)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_RORI),y)
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KBUILD_CFLAGS += $(call cc-option,-mrori)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_SEXT),y)
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KBUILD_CFLAGS += $(call cc-option,-msext)
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endif
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libs-y += $(LIBGCC)
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PHONY += vmlinux.bin
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vmlinux.bin: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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