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>
6.0 KiB
parisc/Makefile
This file is included by the global makefile so that you can add your own
architecture-specific flags and dependencies.
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
Portions Copyright (C) 1999 The Puffin Group
Modified for PA-RISC Linux by Paul Lahaie, Alex deVries,
Mike Shaver, Helge Deller and Martin K. Petersen
boot := arch/parisc/boot KBUILD_IMAGE := $(boot)/bzImage
CHECKFLAGS += -D__hppa__=1
ifdef CONFIG_64BIT UTS_MACHINE := parisc64 CHECKFLAGS += -D__LP64__=1 LD_BFD := elf64-hppa-linux else # 32-bit LD_BFD := elf32-hppa-linux endif
select defconfig based on actual architecture
ifeq ($(ARCH),parisc64) KBUILD_DEFCONFIG := generic-64bit_defconfig CC_ARCHES := hppa64 else KBUILD_DEFCONFIG := generic-32bit_defconfig CC_ARCHES := hppa hppa2.0 hppa1.1 endif
export LD_BFD
Set default 32 bits cross compilers for vdso
CC_ARCHES_32 = hppa hppa2.0 hppa1.1
CC_SUFFIXES = linux linux-gnu unknown-linux-gnu suse-linux
CROSS32_COMPILE := $(call cc-cross-prefix,
$(foreach a,$(CC_ARCHES_32),
$(foreach s,$(CC_SUFFIXES),$(a)-$(s)-)))
CROSS32CC := $(CROSS32_COMPILE)gcc
export CROSS32CC
Set default cross compiler for kernel build
ifdef cross_compiling
ifeq ($(CROSS_COMPILE),)
CC_SUFFIXES = linux linux-gnu unknown-linux-gnu suse-linux
CROSS_COMPILE := $(call cc-cross-prefix,
$(foreach a,$(CC_ARCHES),
$(foreach s,$(CC_SUFFIXES),$(a)-$(s)-)))
endif
endif
ifdef CONFIG_DYNAMIC_FTRACE ifdef CONFIG_64BIT NOP_COUNT := 8 else NOP_COUNT := 5 endif
export CC_USING_RECORD_MCOUNT:=1 export CC_USING_PATCHABLE_FUNCTION_ENTRY:=1
KBUILD_AFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY=1
KBUILD_CFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY=1
-DFTRACE_PATCHABLE_FUNCTION_SIZE=$(NOP_COUNT)
CC_FLAGS_FTRACE := -fpatchable-function-entry=$(NOP_COUNT),$(shell echo $$(($(NOP_COUNT)-1))) endif
OBJCOPY_FLAGS =-O binary -R .note -R .comment -S
cflags-y := -pipe
These flags should be implied by an hppa-linux configuration, but they
are not in gcc 3.2.
cflags-y += -mno-space-regs
-mfast-indirect-calls is only relevant for 32-bit kernels.
ifndef CONFIG_64BIT cflags-y += -mfast-indirect-calls endif
Currently we save and restore fpregs on all kernel entry/interruption paths.
If that gets optimized, we might need to disable the use of fpregs in the
kernel.
cflags-y += -mdisable-fpregs
Use long jumps instead of long branches (needed if your linker fails to
link a too big vmlinux executable). Not enabled for building modules.
ifdef CONFIG_MLONGCALLS KBUILD_CFLAGS_KERNEL += -mlong-calls endif
Without this, "ld -r" results in .text sections that are too big (> 0x40000)
for branches to reach stubs. And multiple .text sections trigger a warning
when creating the sysfs module information section.
ifndef CONFIG_64BIT KBUILD_CFLAGS_MODULE += -ffunction-sections endif
select which processor to optimise for
cflags-$(CONFIG_PA7000) += -march=1.1 -mschedule=7100 cflags-$(CONFIG_PA7200) += -march=1.1 -mschedule=7200 cflags-$(CONFIG_PA7100LC) += -march=1.1 -mschedule=7100LC cflags-$(CONFIG_PA7300LC) += -march=1.1 -mschedule=7300 cflags-$(CONFIG_PA8X00) += -march=2.0 -mschedule=8000
KBUILD_CFLAGS += $(cflags-y) LIBGCC := $(shell $(CC) -print-libgcc-file-name) export LIBGCC
libs-y += arch/parisc/lib/ $(LIBGCC)
boot := arch/parisc/boot
PALO := $(shell if (which palo 2>&1); then : ;
elif [ -x /sbin/palo ]; then echo /sbin/palo;
fi)
PALOCONF := $(shell if [ -f $(srctree)/palo.conf ]; then echo $(srctree)/palo.conf;
else echo $(objtree)/palo.conf;
fi)
palo lifimage: vmlinuz
@if test ! -x "$(PALO)"; then
echo 'ERROR: Please install palo first (apt-get install palo)';
echo 'or build it from source and install it somewhere in your $$PATH';
false;
fi
@if test ! -f "$(PALOCONF)"; then
cp $(srctree)/arch/parisc/defpalo.conf $(objtree)/palo.conf;
echo 'A generic palo config file ($(objree)/palo.conf) has been created for you.';
echo 'You should check it and re-run "make palo".';
echo 'WARNING: the "lifimage" file is now placed in this directory by default!';
false;
fi
$(PALO) -f $(PALOCONF)
BOOT_TARGETS = zImage Image palo lifimage INSTALL_TARGETS = zinstall install
PHONY += bzImage $(BOOT_TARGETS) $(INSTALL_TARGETS)
Default kernel to build
all: bzImage
zImage: vmlinuz Image: vmlinux
bzImage: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
vmlinuz: bzImage $(OBJCOPY) $(boot)/bzImage $@
ifeq ($(KBUILD_EXTMOD),)
We need to generate vdso-offsets.h before compiling certain files in kernel/.
In order to do that, we should use the archprepare target, but we can't since
asm-offsets.h is included in some files used to generate vdso-offsets.h, and
asm-offsets.h is built in prepare0, for which archprepare is a dependency.
Therefore we need to generate the header after prepare0 has been made, hence
this hack.
prepare: vdso_prepare
vdso_prepare: prepare0
$(if $(CONFIG_64BIT),$(Q)$(MAKE)
$(build)=arch/parisc/kernel/vdso64 include/generated/vdso64-offsets.h)
$(Q)$(MAKE) $(build)=arch/parisc/kernel/vdso32 include/generated/vdso32-offsets.h
endif
PHONY += vdso_install
vdso_install:
$(Q)$(MAKE) $(build)=arch/parisc/kernel/vdso $@
$(if $(CONFIG_COMPAT_VDSO),
$(Q)$(MAKE) $(build)=arch/parisc/kernel/vdso32 $@)
install: KBUILD_IMAGE := vmlinux zinstall: KBUILD_IMAGE := vmlinuz install zinstall: $(call cmd,install)
CLEAN_FILES += lifimage MRPROPER_FILES += palo.conf
define archhelp @echo '* vmlinux - Uncompressed kernel image (./vmlinux)' @echo ' vmlinuz - Compressed kernel image (./vmlinuz)' @echo ' palo - Bootable image (./lifimage)' @echo ' install - Install uncompressed vmlinux kernel using' @echo ' (your) ~/bin/$(INSTALLKERNEL) or' @echo ' (distribution) /sbin/$(INSTALLKERNEL) or' @echo ' copy to $$(INSTALL_PATH)' @echo ' zinstall - Install compressed vmlinuz kernel' endef
archheaders: $(Q)$(MAKE) $(build)=arch/parisc/kernel/syscalls all