mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
dc5dac748a
Add an option to build kernel and module with prefixed instructions if the CPU and toolchain support it. This is not related to kernel support for userspace execution of prefixed instructions. Building with prefixed instructions breaks some extended inline asm memory addressing, for example it will provide immediates that exceed the range of simple load/store displacement. Whether this is a toolchain or a kernel asm problem remains to be seen. For now, these are replaced with simpler and less efficient direct register addressing when compiling with prefixed. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230408021752.862660-4-npiggin@gmail.com
397 lines
13 KiB
Makefile
397 lines
13 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.
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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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# If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
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# ppc64_defconfig because we have nothing better to go on.
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uname := $(shell uname -m)
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KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig
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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 := $(NM) --synthetic
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endif
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# BITS is used as extension for files which are available in a 32 bit
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# and a 64 bit version to simplify shared Makefiles.
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# e.g.: obj-y += foo_$(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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ifeq ($(call ld-ifversion, -ge, 22500, 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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ifdef CONFIG_CPU_LITTLE_ENDIAN
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KBUILD_CFLAGS += -mlittle-endian
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KBUILD_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 += $(call cc-option,-mbig-endian)
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KBUILD_LDFLAGS += -EB
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LDEMULATION := ppc
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GNUTARGET := powerpc
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MULTIPLEWORD := -mmultiple
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endif
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ifdef CONFIG_PPC64
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ifndef CONFIG_CC_IS_CLANG
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cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
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cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc)
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aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
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aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2
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endif
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endif
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ifndef CONFIG_CC_IS_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$(BITS)
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KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
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endif
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cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
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ifdef CONFIG_PPC64
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cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
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else
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cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
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endif
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LDFLAGS_vmlinux-y := -Bstatic
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LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
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LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
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LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
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ifdef CONFIG_PPC64
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ifeq ($(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) := $(call cc-option,-mtraceback=no)
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ifdef CONFIG_PPC64_ELF_ABI_V2
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CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
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else
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ifndef CONFIG_CC_IS_CLANG
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CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
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CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
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endif
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endif
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CFLAGS-$(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_PPC64) += $(call cc-option,-mlong-double-128)
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# Clang unconditionally reserves r2 on ppc32 and does not support the flag
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# https://bugs.llvm.org/show_bug.cgi?id=39555
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CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
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# Clang doesn't support -mmultiple / -mno-multiple
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# https://bugs.llvm.org/show_bug.cgi?id=39556
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CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
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CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
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ifdef CONFIG_FUNCTION_TRACER
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CC_FLAGS_FTRACE := -pg
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ifdef CONFIG_MPROFILE_KERNEL
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CC_FLAGS_FTRACE += -mprofile-kernel
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endif
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endif
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CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
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AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
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CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \
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$(call cc-option,-mtune=power9, \
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$(call cc-option,-mtune=power8)))
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asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
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KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
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KBUILD_AFLAGS += $(AFLAGS-y)
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KBUILD_CFLAGS += $(call cc-option,-msoft-float)
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KBUILD_CFLAGS += -pipe $(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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ifdef CONFIG_476FPE_ERR46
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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 prefix or pcrel
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ifdef CONFIG_PPC_KERNEL_PREFIXED
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KBUILD_CFLAGS += $(call cc-option,-mprefixed)
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else
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KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
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endif
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KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
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# No AltiVec or VSX or MMA 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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KBUILD_CFLAGS += $(call cc-option,-mno-mma)
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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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# Don't emit .eh_frame since we have no use for it
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KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
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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 += $(call cc-option,-mno-string)
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cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
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# When using '-many -mpower4' gas will first try and find a matching power4
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# mnemonic and failing that it will allow any valid mnemonic that GAS knows
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# about. GCC will pass -many to GAS when assembling, clang does not.
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# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
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# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
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cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
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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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# 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)/%,$@)
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PHONY += bootwrapper_install
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bootwrapper_install:
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$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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include $(srctree)/scripts/Makefile.defconf
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PHONY += pseries_le_defconfig
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pseries_le_defconfig:
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$(call merge_into_defconfig,pseries_defconfig,le)
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PHONY += ppc64le_defconfig
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ppc64le_defconfig:
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$(call merge_into_defconfig,ppc64_defconfig,le)
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PHONY += ppc64le_guest_defconfig
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ppc64le_guest_defconfig:
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$(call merge_into_defconfig,ppc64_defconfig,le guest)
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PHONY += ppc64_guest_defconfig
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ppc64_guest_defconfig:
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$(call merge_into_defconfig,ppc64_defconfig,be guest)
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PHONY += powernv_be_defconfig
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powernv_be_defconfig:
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$(call merge_into_defconfig,powernv_defconfig,be)
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PHONY += mpc85xx_defconfig
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mpc85xx_defconfig:
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$(call merge_into_defconfig,mpc85xx_base.config,\
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85xx-32bit 85xx-hw fsl-emb-nonhw)
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PHONY += mpc85xx_smp_defconfig
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mpc85xx_smp_defconfig:
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$(call merge_into_defconfig,mpc85xx_base.config,\
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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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$(call merge_into_defconfig,corenet_base.config,\
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85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
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PHONY += corenet64_smp_defconfig
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corenet64_smp_defconfig:
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$(call merge_into_defconfig,corenet_base.config,\
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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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$(call merge_into_defconfig,mpc86xx_base.config,\
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86xx-hw fsl-emb-nonhw)
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PHONY += mpc86xx_smp_defconfig
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mpc86xx_smp_defconfig:
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$(call merge_into_defconfig,mpc86xx_base.config,\
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86xx-smp 86xx-hw fsl-emb-nonhw)
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PHONY += ppc32_allmodconfig
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ppc32_allmodconfig:
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$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
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-f $(srctree)/Makefile allmodconfig
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PHONY += ppc_defconfig
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ppc_defconfig:
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$(call merge_into_defconfig,book3s_32.config,)
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PHONY += ppc64le_allmodconfig
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ppc64le_allmodconfig:
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$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
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-f $(srctree)/Makefile allmodconfig
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PHONY += ppc64le_allnoconfig
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ppc64le_allnoconfig:
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$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
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-f $(srctree)/Makefile allnoconfig
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PHONY += ppc64_book3e_allmodconfig
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ppc64_book3e_allmodconfig:
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$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
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-f $(srctree)/Makefile allmodconfig
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PHONY += ppc32_randconfig
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ppc32_randconfig:
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$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
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-f $(srctree)/Makefile randconfig
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PHONY += ppc64_randconfig
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ppc64_randconfig:
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$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
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-f $(srctree)/Makefile randconfig
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define archhelp
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@echo '* zImage - Build default images selected by kernel config'
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@echo ' zImage.* - Compressed kernel image (arch/$(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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PHONY += install
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install:
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$(call cmd,install)
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ifeq ($(KBUILD_EXTMOD),)
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# We need to generate vdso-offsets.h before compiling certain files in kernel/.
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# In order to do that, we should use the archprepare target, but we can't since
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# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
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# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
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# Therefore we need to generate the header after prepare0 has been made, hence
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# this hack.
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prepare: vdso_prepare
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vdso_prepare: prepare0
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$(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
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$(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
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$(if $(CONFIG_PPC64),$(Q)$(MAKE) \
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$(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
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endif
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archprepare: checkbin
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archheaders:
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$(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
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ifdef CONFIG_STACKPROTECTOR
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prepare: stack_protector_prepare
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PHONY += stack_protector_prepare
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stack_protector_prepare: prepare0
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ifdef CONFIG_PPC64
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$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
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else
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$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
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endif
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endif
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PHONY += checkbin
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# Check toolchain versions:
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# - gcc-4.6 is the minimum kernel-wide version so nothing required.
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checkbin:
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@if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
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"x$(call ld-ifversion, -le, 22400, y)" = "xy" ; 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 '*** binutils 2.23 do not define the TOC symbol ' ; \
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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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