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25165120f2
Jeremy Fitzhardinge suggested the use of -freg-struct-return, which does
structure-returns (such as when using pte_t) in registers instead of on
the stack.
that is indeed so, and this option reduced the kernel size a bit:
text data bss dec hex filename
4799506 543456 3760128 9103090 8ae6f2 vmlinux.before
4798117 543456 3760128 9101701 8ae185 vmlinux.after
the resulting kernel booted fine on my testbox. Lets go for it.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
159 lines
5.1 KiB
Makefile
159 lines
5.1 KiB
Makefile
#
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# i386/Makefile
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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. Remember to do have actions
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# for "archclean" cleaning up for this architecture.
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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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#
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# 19990713 Artur Skawina <skawina@geocities.com>
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# Added '-march' and '-mpreferred-stack-boundary' support
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#
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# 20050320 Kianusch Sayah Karadji <kianusch@sk-tech.net>
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# Added support for GEODE CPU
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HAS_BIARCH := $(call cc-option-yn, -m32)
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ifeq ($(HAS_BIARCH),y)
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AS := $(AS) --32
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LD := $(LD) -m elf_i386
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CC := $(CC) -m32
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endif
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LDFLAGS := -m elf_i386
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OBJCOPYFLAGS := -O binary -R .note -R .comment -S
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ifdef CONFIG_RELOCATABLE
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LDFLAGS_vmlinux := --emit-relocs
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endif
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CHECKFLAGS += -D__i386__
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CFLAGS += -pipe -msoft-float -mregparm=3 -freg-struct-return
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# prevent gcc from keeping the stack 16 byte aligned
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CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
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# CPU-specific tuning. Anything which can be shared with UML should go here.
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include $(srctree)/arch/i386/Makefile.cpu
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# temporary until string.h is fixed
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cflags-y += -ffreestanding
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# this works around some issues with generating unwind tables in older gccs
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# newer gccs do it by default
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cflags-y += -maccumulate-outgoing-args
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# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
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# a lot more stack due to the lack of sharing of stacklots:
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CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then echo $(call cc-option,-fno-unit-at-a-time); fi ;)
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# do binutils support CFI?
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cflags-y += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
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AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
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# is .cfi_signal_frame supported too?
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cflags-y += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)
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AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)
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CFLAGS += $(cflags-y)
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# Default subarch .c files
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mcore-y := mach-default
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# Voyager subarch support
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mflags-$(CONFIG_X86_VOYAGER) := -Iinclude/asm-i386/mach-voyager
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mcore-$(CONFIG_X86_VOYAGER) := mach-voyager
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# VISWS subarch support
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mflags-$(CONFIG_X86_VISWS) := -Iinclude/asm-i386/mach-visws
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mcore-$(CONFIG_X86_VISWS) := mach-visws
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# NUMAQ subarch support
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mflags-$(CONFIG_X86_NUMAQ) := -Iinclude/asm-i386/mach-numaq
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mcore-$(CONFIG_X86_NUMAQ) := mach-default
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# BIGSMP subarch support
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mflags-$(CONFIG_X86_BIGSMP) := -Iinclude/asm-i386/mach-bigsmp
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mcore-$(CONFIG_X86_BIGSMP) := mach-default
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#Summit subarch support
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mflags-$(CONFIG_X86_SUMMIT) := -Iinclude/asm-i386/mach-summit
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mcore-$(CONFIG_X86_SUMMIT) := mach-default
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# generic subarchitecture
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mflags-$(CONFIG_X86_GENERICARCH) := -Iinclude/asm-i386/mach-generic
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mcore-$(CONFIG_X86_GENERICARCH) := mach-default
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core-$(CONFIG_X86_GENERICARCH) += arch/i386/mach-generic/
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# ES7000 subarch support
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mflags-$(CONFIG_X86_ES7000) := -Iinclude/asm-i386/mach-es7000
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mcore-$(CONFIG_X86_ES7000) := mach-default
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core-$(CONFIG_X86_ES7000) := arch/i386/mach-es7000/
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# default subarch .h files
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mflags-y += -Iinclude/asm-i386/mach-default
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head-y := arch/i386/kernel/head.o arch/i386/kernel/init_task.o
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libs-y += arch/i386/lib/
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core-y += arch/i386/kernel/ \
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arch/i386/mm/ \
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arch/i386/$(mcore-y)/ \
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arch/i386/crypto/
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drivers-$(CONFIG_MATH_EMULATION) += arch/i386/math-emu/
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drivers-$(CONFIG_PCI) += arch/i386/pci/
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# must be linked after kernel/
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drivers-$(CONFIG_OPROFILE) += arch/i386/oprofile/
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drivers-$(CONFIG_PM) += arch/i386/power/
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CFLAGS += $(mflags-y)
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AFLAGS += $(mflags-y)
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boot := arch/i386/boot
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PHONY += zImage bzImage compressed zlilo bzlilo \
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zdisk bzdisk fdimage fdimage144 fdimage288 isoimage install
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all: bzImage
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# KBUILD_IMAGE specify target image being built
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KBUILD_IMAGE := $(boot)/bzImage
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zImage zlilo zdisk: KBUILD_IMAGE := arch/i386/boot/zImage
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zImage bzImage: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
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compressed: zImage
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zlilo bzlilo: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zlilo
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zdisk bzdisk: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zdisk
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fdimage fdimage144 fdimage288 isoimage: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) $@
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install:
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) install
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archclean:
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$(Q)$(MAKE) $(clean)=arch/i386/boot
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define archhelp
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echo '* bzImage - Compressed kernel image (arch/$(ARCH)/boot/bzImage)'
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echo ' install - Install kernel using'
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echo ' (your) ~/bin/installkernel or'
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echo ' (distribution) /sbin/installkernel or'
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echo ' install to $$(INSTALL_PATH) and run lilo'
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echo ' bzdisk - Create a boot floppy in /dev/fd0'
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echo ' fdimage - Create a boot floppy image'
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echo ' isoimage - Create a boot CD-ROM image'
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endef
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CLEAN_FILES += arch/$(ARCH)/boot/fdimage \
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arch/$(ARCH)/boot/image.iso \
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arch/$(ARCH)/boot/mtools.conf
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