mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
cdfce1f571
This avoids some problems with gcc 4.x and earlier generating invalid unwind information. In 4.1 the option is default when unwind information is enabled. And it seems to generate smaller code too, so it's probably a good thing on its own. With gcc 4.0: i386: 4683198 902112 480868 6066178 5c9002 vmlinux (before) 4449895 902112 480868 5832875 5900ab vmlinux (after) x86-64: 4939761 1449584 648216 7037561 6b6279 vmlinux (before) 4854193 1449584 648216 6951993 6a1439 vmlinux (after) On 4.1 it shouldn't make much difference because it is default when unwind is enabled anyways. Suggested by Michael Matz and Jan Beulich Cc: jbeulich@novell.com Signed-off-by: Andi Kleen <ak@suse.de>
159 lines
5.1 KiB
Makefile
159 lines
5.1 KiB
Makefile
#
|
|
# i386/Makefile
|
|
#
|
|
# This file is included by the global makefile so that you can add your own
|
|
# architecture-specific flags and dependencies. Remember to do have actions
|
|
# for "archclean" cleaning up for this architecture.
|
|
#
|
|
# 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) 1994 by Linus Torvalds
|
|
#
|
|
# 19990713 Artur Skawina <skawina@geocities.com>
|
|
# Added '-march' and '-mpreferred-stack-boundary' support
|
|
#
|
|
# 20050320 Kianusch Sayah Karadji <kianusch@sk-tech.net>
|
|
# Added support for GEODE CPU
|
|
|
|
HAS_BIARCH := $(call cc-option-yn, -m32)
|
|
ifeq ($(HAS_BIARCH),y)
|
|
AS := $(AS) --32
|
|
LD := $(LD) -m elf_i386
|
|
CC := $(CC) -m32
|
|
endif
|
|
|
|
LDFLAGS := -m elf_i386
|
|
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
|
|
LDFLAGS_vmlinux :=
|
|
CHECKFLAGS += -D__i386__
|
|
|
|
CFLAGS += -pipe -msoft-float
|
|
|
|
# prevent gcc from keeping the stack 16 byte aligned
|
|
CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
|
|
|
|
# CPU-specific tuning. Anything which can be shared with UML should go here.
|
|
include $(srctree)/arch/i386/Makefile.cpu
|
|
|
|
cflags-$(CONFIG_REGPARM) += -mregparm=3
|
|
|
|
# temporary until string.h is fixed
|
|
cflags-y += -ffreestanding
|
|
|
|
# this works around some issues with generating unwind tables in older gccs
|
|
# newer gccs do it by default
|
|
cflags-y += -maccumulate-outgoing-args
|
|
|
|
# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
|
|
# a lot more stack due to the lack of sharing of stacklots:
|
|
CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then echo $(call cc-option,-fno-unit-at-a-time); fi ;)
|
|
|
|
# do binutils support CFI?
|
|
cflags-y += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
|
|
AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
|
|
|
|
# is .cfi_signal_frame supported too?
|
|
cflags-y += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)
|
|
AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)
|
|
|
|
CFLAGS += $(cflags-y)
|
|
|
|
# Default subarch .c files
|
|
mcore-y := mach-default
|
|
|
|
# Voyager subarch support
|
|
mflags-$(CONFIG_X86_VOYAGER) := -Iinclude/asm-i386/mach-voyager
|
|
mcore-$(CONFIG_X86_VOYAGER) := mach-voyager
|
|
|
|
# VISWS subarch support
|
|
mflags-$(CONFIG_X86_VISWS) := -Iinclude/asm-i386/mach-visws
|
|
mcore-$(CONFIG_X86_VISWS) := mach-visws
|
|
|
|
# NUMAQ subarch support
|
|
mflags-$(CONFIG_X86_NUMAQ) := -Iinclude/asm-i386/mach-numaq
|
|
mcore-$(CONFIG_X86_NUMAQ) := mach-default
|
|
|
|
# BIGSMP subarch support
|
|
mflags-$(CONFIG_X86_BIGSMP) := -Iinclude/asm-i386/mach-bigsmp
|
|
mcore-$(CONFIG_X86_BIGSMP) := mach-default
|
|
|
|
#Summit subarch support
|
|
mflags-$(CONFIG_X86_SUMMIT) := -Iinclude/asm-i386/mach-summit
|
|
mcore-$(CONFIG_X86_SUMMIT) := mach-default
|
|
|
|
# generic subarchitecture
|
|
mflags-$(CONFIG_X86_GENERICARCH) := -Iinclude/asm-i386/mach-generic
|
|
mcore-$(CONFIG_X86_GENERICARCH) := mach-default
|
|
core-$(CONFIG_X86_GENERICARCH) += arch/i386/mach-generic/
|
|
|
|
# ES7000 subarch support
|
|
mflags-$(CONFIG_X86_ES7000) := -Iinclude/asm-i386/mach-es7000
|
|
mcore-$(CONFIG_X86_ES7000) := mach-default
|
|
core-$(CONFIG_X86_ES7000) := arch/i386/mach-es7000/
|
|
|
|
# default subarch .h files
|
|
mflags-y += -Iinclude/asm-i386/mach-default
|
|
|
|
head-y := arch/i386/kernel/head.o arch/i386/kernel/init_task.o
|
|
|
|
libs-y += arch/i386/lib/
|
|
core-y += arch/i386/kernel/ \
|
|
arch/i386/mm/ \
|
|
arch/i386/$(mcore-y)/ \
|
|
arch/i386/crypto/
|
|
drivers-$(CONFIG_MATH_EMULATION) += arch/i386/math-emu/
|
|
drivers-$(CONFIG_PCI) += arch/i386/pci/
|
|
# must be linked after kernel/
|
|
drivers-$(CONFIG_OPROFILE) += arch/i386/oprofile/
|
|
drivers-$(CONFIG_PM) += arch/i386/power/
|
|
|
|
CFLAGS += $(mflags-y)
|
|
AFLAGS += $(mflags-y)
|
|
|
|
boot := arch/i386/boot
|
|
|
|
PHONY += zImage bzImage compressed zlilo bzlilo \
|
|
zdisk bzdisk fdimage fdimage144 fdimage288 isoimage install
|
|
|
|
all: bzImage
|
|
|
|
# KBUILD_IMAGE specify target image being built
|
|
KBUILD_IMAGE := $(boot)/bzImage
|
|
zImage zlilo zdisk: KBUILD_IMAGE := arch/i386/boot/zImage
|
|
|
|
zImage bzImage: vmlinux
|
|
$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
|
|
|
|
compressed: zImage
|
|
|
|
zlilo bzlilo: vmlinux
|
|
$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zlilo
|
|
|
|
zdisk bzdisk: vmlinux
|
|
$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zdisk
|
|
|
|
fdimage fdimage144 fdimage288 isoimage: vmlinux
|
|
$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) $@
|
|
|
|
install:
|
|
$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) install
|
|
|
|
archclean:
|
|
$(Q)$(MAKE) $(clean)=arch/i386/boot
|
|
|
|
define archhelp
|
|
echo '* bzImage - Compressed kernel image (arch/$(ARCH)/boot/bzImage)'
|
|
echo ' install - Install kernel using'
|
|
echo ' (your) ~/bin/installkernel or'
|
|
echo ' (distribution) /sbin/installkernel or'
|
|
echo ' install to $$(INSTALL_PATH) and run lilo'
|
|
echo ' bzdisk - Create a boot floppy in /dev/fd0'
|
|
echo ' fdimage - Create a boot floppy image'
|
|
echo ' isoimage - Create a boot CD-ROM image'
|
|
endef
|
|
|
|
CLEAN_FILES += arch/$(ARCH)/boot/fdimage \
|
|
arch/$(ARCH)/boot/image.iso \
|
|
arch/$(ARCH)/boot/mtools.conf
|