mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 04:00:53 +07:00
1c38976334
When compiled with GCC 8.1, vmlinux is significantly bigger than
with GCC 4.8.
When looking at the generated code with objdump, we notice that
all functions and loops when a 16 bytes alignment. This significantly
increases the size of the kernel. It is pointless and even
counterproductive as on the 8xx 'nop' also consumes one clock cycle.
Size of vmlinux with GCC 4.8:
text data bss dec hex filename
5801948 1626076 457796 7885820 7853fc vmlinux
Size of vmlinux with GCC 8.1:
text data bss dec hex filename
6764592 1630652 456476 8851720 871108 vmlinux
Size of vmlinux with GCC 8.1 and this patch:
text data bss dec hex filename
6331544 1631756 456476 8419776 8079c0 vmlinux
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
448 lines
15 KiB
Makefile
448 lines
15 KiB
Makefile
# 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" and "archdep" for cleaning up and making dependencies for
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# 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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# Changes for PPC by Gary Thomas
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# Rewritten by Cort Dougan and Paul Mackerras
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#
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HAS_BIARCH := $(call cc-option-yn, -m32)
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# Set default 32 bits cross compilers for vdso and boot wrapper
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CROSS32_COMPILE ?=
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ifeq ($(HAS_BIARCH),y)
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ifeq ($(CROSS32_COMPILE),)
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ifdef CONFIG_PPC32
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# These options will be overridden by any -mcpu option that the CPU
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# or platform code sets later on the command line, but they are needed
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# to set a sane 32-bit cpu target for the 64-bit cross compiler which
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# may default to the wrong ISA.
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KBUILD_CFLAGS += -mcpu=powerpc
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KBUILD_AFLAGS += -mcpu=powerpc
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endif
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endif
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endif
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ifeq ($(CROSS_COMPILE),)
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KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
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else
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KBUILD_DEFCONFIG := ppc64_defconfig
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endif
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ifeq ($(CONFIG_PPC64),y)
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new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
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ifeq ($(new_nm),y)
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NM := $(NM) --synthetic
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endif
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endif
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# BITS is used as extension for files which are available in a 32 bit
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# and a 64 bit version to simplify shared Makefiles.
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# e.g.: obj-y += foo_$(BITS).o
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export BITS
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ifdef CONFIG_PPC64
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BITS := 64
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else
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BITS := 32
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endif
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machine-y = ppc
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machine-$(CONFIG_PPC64) += 64
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machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
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UTS_MACHINE := $(subst $(space),,$(machine-y))
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# XXX This needs to be before we override LD below
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ifdef CONFIG_PPC32
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KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
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else
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KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/powerpc/kernel/module.lds
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ifeq ($(call ld-ifversion, -ge, 225000000, y),y)
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# Have the linker provide sfpr if possible.
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# There is a corresponding test in arch/powerpc/lib/Makefile
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KBUILD_LDFLAGS_MODULE += --save-restore-funcs
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else
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KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
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endif
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endif
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ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
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KBUILD_CFLAGS += -mlittle-endian
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LDFLAGS += -EL
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LDEMULATION := lppc
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GNUTARGET := powerpcle
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MULTIPLEWORD := -mno-multiple
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KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
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else
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KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
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LDFLAGS += -EB
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LDEMULATION := ppc
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GNUTARGET := powerpc
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MULTIPLEWORD := -mmultiple
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endif
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ifdef CONFIG_PPC64
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cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
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cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mcall-aixdesc)
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aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
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aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2
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endif
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ifneq ($(cc-name),clang)
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cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
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endif
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cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
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cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
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aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
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aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
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ifeq ($(HAS_BIARCH),y)
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KBUILD_CFLAGS += -m$(BITS)
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KBUILD_AFLAGS += -m$(BITS) -Wl,-a$(BITS)
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LDFLAGS += -m elf$(BITS)$(LDEMULATION)
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KBUILD_ARFLAGS += --target=elf$(BITS)-$(GNUTARGET)
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endif
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LDFLAGS_vmlinux-y := -Bstatic
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LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
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LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
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LDFLAGS_vmlinux += $(call ld-option,--orphan-handling=warn)
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ifeq ($(CONFIG_PPC64),y)
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ifeq ($(call cc-option-yn,-mcmodel=medium),y)
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# -mcmodel=medium breaks modules because it uses 32bit offsets from
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# the TOC pointer to create pointers where possible. Pointers into the
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# percpu data area are created by this method.
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#
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# The kernel module loader relocates the percpu data section from the
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# original location (starting with 0xd...) to somewhere in the base
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# kernel percpu data space (starting with 0xc...). We need a full
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# 64bit relocation for this to work, hence -mcmodel=large.
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KBUILD_CFLAGS_MODULE += -mcmodel=large
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else
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export NO_MINIMAL_TOC := -mno-minimal-toc
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endif
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endif
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CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
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ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
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CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
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AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
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else
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CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
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CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
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AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
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endif
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CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
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CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
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CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 $(MULTIPLEWORD)
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CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
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ifeq ($(CONFIG_PPC_BOOK3S_64),y)
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ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
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CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
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CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
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else
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CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
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CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
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endif
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else
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CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
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endif
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ifdef CONFIG_MPROFILE_KERNEL
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ifeq ($(shell $(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__),OK)
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CC_FLAGS_FTRACE := -pg -mprofile-kernel
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KBUILD_CPPFLAGS += -DCC_USING_MPROFILE_KERNEL
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else
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# If the user asked for mprofile-kernel but the toolchain doesn't
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# support it, emit a warning and deliberately break the build later
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# with mprofile-kernel-not-supported. We would prefer to make this an
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# error right here, but then the user would never be able to run
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# oldconfig to change their configuration.
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$(warning Compiler does not support mprofile-kernel, set CONFIG_DISABLE_MPROFILE_KERNEL)
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CC_FLAGS_FTRACE := -mprofile-kernel-not-supported
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endif
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endif
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CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
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CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
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CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
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CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
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CFLAGS-$(CONFIG_POWER8_CPU) += $(call cc-option,-mcpu=power8)
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CFLAGS-$(CONFIG_POWER9_CPU) += $(call cc-option,-mcpu=power9)
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CFLAGS-$(CONFIG_PPC_8xx) += $(call cc-option,-mcpu=860)
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# Altivec option not allowed with e500mc64 in GCC.
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ifeq ($(CONFIG_ALTIVEC),y)
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E5500_CPU := -mcpu=powerpc64
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else
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E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
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endif
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CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
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CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
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ifeq ($(CONFIG_PPC32),y)
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ifeq ($(CONFIG_PPC_E500MC),y)
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CFLAGS-y += $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
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else
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CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
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endif
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endif
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asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
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KBUILD_CPPFLAGS += -Iarch/$(ARCH) $(asinstr)
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KBUILD_AFLAGS += -Iarch/$(ARCH) $(AFLAGS-y)
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KBUILD_CFLAGS += $(call cc-option,-msoft-float)
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KBUILD_CFLAGS += -pipe -Iarch/$(ARCH) $(CFLAGS-y)
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CPP = $(CC) -E $(KBUILD_CFLAGS)
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CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
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ifdef CONFIG_CPU_BIG_ENDIAN
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CHECKFLAGS += -D__BIG_ENDIAN__
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else
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CHECKFLAGS += -D__LITTLE_ENDIAN__
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endif
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ifeq ($(CONFIG_476FPE_ERR46),y)
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KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
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-T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
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endif
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# No AltiVec or VSX instructions when building kernel
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KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
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KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
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# No SPE instruction when building kernel
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# (We use all available options to help semi-broken compilers)
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KBUILD_CFLAGS += $(call cc-option,-mno-spe)
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KBUILD_CFLAGS += $(call cc-option,-mspe=no)
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# Enable unit-at-a-time mode when possible. It shrinks the
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# kernel considerably.
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KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
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# FIXME: the module load should be taught about the additional relocs
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# generated by this.
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# revert to pre-gcc-4.4 behaviour of .eh_frame
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KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
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# Never use string load/store instructions as they are
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# often slow when they are implemented at all
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KBUILD_CFLAGS += $(call cc-option,-mno-string)
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ifeq ($(CONFIG_6xx),y)
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KBUILD_CFLAGS += -mcpu=powerpc
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endif
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# Work around a gcc code-gen bug with -fno-omit-frame-pointer.
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ifeq ($(CONFIG_FUNCTION_TRACER),y)
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KBUILD_CFLAGS += -mno-sched-epilog
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endif
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cpu-as-$(CONFIG_4xx) += -Wa,-m405
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cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
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cpu-as-$(CONFIG_E200) += -Wa,-me200
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cpu-as-$(CONFIG_PPC_BOOK3S_64) += -Wa,-mpower4
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KBUILD_AFLAGS += $(cpu-as-y)
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KBUILD_CFLAGS += $(cpu-as-y)
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KBUILD_AFLAGS += $(aflags-y)
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KBUILD_CFLAGS += $(cflags-y)
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head-y := arch/powerpc/kernel/head_$(BITS).o
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head-$(CONFIG_PPC_8xx) := arch/powerpc/kernel/head_8xx.o
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head-$(CONFIG_40x) := arch/powerpc/kernel/head_40x.o
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head-$(CONFIG_44x) := arch/powerpc/kernel/head_44x.o
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head-$(CONFIG_FSL_BOOKE) := arch/powerpc/kernel/head_fsl_booke.o
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head-$(CONFIG_PPC64) += arch/powerpc/kernel/entry_64.o
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head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
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head-$(CONFIG_ALTIVEC) += arch/powerpc/kernel/vector.o
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head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += arch/powerpc/kernel/prom_init.o
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core-y += arch/powerpc/kernel/ \
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arch/powerpc/mm/ \
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arch/powerpc/lib/ \
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arch/powerpc/sysdev/ \
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arch/powerpc/platforms/ \
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arch/powerpc/math-emu/ \
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arch/powerpc/crypto/ \
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arch/powerpc/net/
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core-$(CONFIG_XMON) += arch/powerpc/xmon/
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core-$(CONFIG_KVM) += arch/powerpc/kvm/
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core-$(CONFIG_PERF_EVENTS) += arch/powerpc/perf/
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core-$(CONFIG_KEXEC_FILE) += arch/powerpc/purgatory/
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drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/
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# Default to zImage, override when needed
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all: zImage
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# With make 3.82 we cannot mix normal and wildcard targets
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BOOT_TARGETS1 := zImage zImage.initrd uImage
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BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
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PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
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boot := arch/$(ARCH)/boot
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$(BOOT_TARGETS1): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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$(BOOT_TARGETS2): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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bootwrapper_install:
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$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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%.dtb: scripts
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$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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# Used to create 'merged defconfigs'
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# To use it $(call) it with the first argument as the base defconfig
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# and the second argument as a space separated list of .config files to merge,
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# without the .config suffix.
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define merge_into_defconfig
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$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
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-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
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$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
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+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
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endef
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PHONY += pseries_le_defconfig
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pseries_le_defconfig:
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$(call merge_into_defconfig,pseries_defconfig,le)
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PHONY += ppc64le_defconfig
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ppc64le_defconfig:
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$(call merge_into_defconfig,ppc64_defconfig,le)
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PHONY += powernv_be_defconfig
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powernv_be_defconfig:
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$(call merge_into_defconfig,powernv_defconfig,be)
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PHONY += mpc85xx_defconfig
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mpc85xx_defconfig:
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$(call merge_into_defconfig,mpc85xx_basic_defconfig,\
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85xx-32bit 85xx-hw fsl-emb-nonhw)
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PHONY += mpc85xx_smp_defconfig
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mpc85xx_smp_defconfig:
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$(call merge_into_defconfig,mpc85xx_basic_defconfig,\
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85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
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PHONY += corenet32_smp_defconfig
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corenet32_smp_defconfig:
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$(call merge_into_defconfig,corenet_basic_defconfig,\
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85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
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PHONY += corenet64_smp_defconfig
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corenet64_smp_defconfig:
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$(call merge_into_defconfig,corenet_basic_defconfig,\
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85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
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PHONY += mpc86xx_defconfig
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mpc86xx_defconfig:
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$(call merge_into_defconfig,mpc86xx_basic_defconfig,\
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86xx-hw fsl-emb-nonhw)
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PHONY += mpc86xx_smp_defconfig
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mpc86xx_smp_defconfig:
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$(call merge_into_defconfig,mpc86xx_basic_defconfig,\
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86xx-smp 86xx-hw fsl-emb-nonhw)
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define archhelp
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@echo '* zImage - Build default images selected by kernel config'
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@echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
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@echo ' uImage - U-Boot native image format'
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@echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
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@echo ' versions which do not support device trees'
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@echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
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@echo ' simpleImage.<dt> - Firmware independent image.'
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@echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
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@echo ' install - Install kernel using'
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@echo ' (your) ~/bin/$(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 ' *_defconfig - Select default config from arch/$(ARCH)/configs'
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@echo ''
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@echo ' Targets with <dt> embed a device tree blob inside the image'
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@echo ' These targets support board with firmware that does not'
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@echo ' support passing a device tree directly. Replace <dt> with the'
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@echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
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@echo ' (minus the .dts extension).'
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endef
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install:
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$(Q)$(MAKE) $(build)=$(boot) install
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vdso_install:
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ifeq ($(CONFIG_PPC64),y)
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$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
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endif
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$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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archprepare: checkbin
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# Use the file '.tmp_gas_check' for binutils tests, as gas won't output
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# to stdout and these checks are run even on install targets.
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TOUT := .tmp_gas_check
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# Check gcc and binutils versions:
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# - gcc-3.4 and binutils-2.14 are a fatal combination
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# - Require gcc 4.0 or above on 64-bit
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# - gcc-4.2.0 has issues compiling modules on 64-bit
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checkbin:
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@if test "$(cc-name)" != "clang" \
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&& test "$(cc-version)" = "0304" ; then \
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if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
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echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
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echo 'correctly with gcc-3.4 and your version of binutils.'; \
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echo '*** Please upgrade your binutils or downgrade your gcc'; \
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false; \
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fi ; \
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fi
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@if test "$(cc-name)" != "clang" \
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&& test "$(cc-version)" -lt "0400" \
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&& test "x${CONFIG_PPC64}" = "xy" ; then \
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echo -n "Sorry, GCC v4.0 or above is required to build " ; \
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echo "the 64-bit powerpc kernel." ; \
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false ; \
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fi
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@if test "$(cc-name)" != "clang" \
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&& test "$(cc-fullversion)" = "040200" \
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&& test "x${CONFIG_MODULES}${CONFIG_PPC64}" = "xyy" ; then \
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echo -n '*** GCC-4.2.0 cannot compile the 64-bit powerpc ' ; \
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echo 'kernel with modules enabled.' ; \
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echo -n '*** Please use a different GCC version or ' ; \
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echo 'disable kernel modules' ; \
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false ; \
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fi
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@if test "x${CONFIG_CPU_LITTLE_ENDIAN}" = "xy" \
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&& $(LD) --version | head -1 | grep ' 2\.24$$' >/dev/null ; then \
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echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
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echo 'in some circumstances.' ; \
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echo -n '*** Please use a different binutils version.' ; \
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false ; \
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fi
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CLEAN_FILES += $(TOUT)
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