Makefile

  1# SPDX-License-Identifier: GPL-2.0
  2#
  3# Author: Huacai Chen <chenhuacai@loongson.cn>
  4# Copyright (C) 2020-2022 Loongson Technology Corporation Limited
  5
  6boot	:= arch/loongarch/boot
  7
  8ifeq ($(shell uname -m),loongarch32)
  9KBUILD_DEFCONFIG := loongson32_defconfig
 10else
 11KBUILD_DEFCONFIG := loongson64_defconfig
 12endif
 13
 14KBUILD_DTBS      := dtbs
 15
 16image-name-y			:= vmlinux
 17image-name-$(CONFIG_EFI_ZBOOT)	:= vmlinuz
 18
 19ifndef CONFIG_EFI_STUB
 20KBUILD_IMAGE	:= $(boot)/vmlinux.elf
 21else
 22KBUILD_IMAGE	:= $(boot)/$(image-name-y).efi
 23endif
 24
 25#
 26# Select the object file format to substitute into the linker script.
 27#
 2864bit-tool-archpref	= loongarch64
 2932bit-bfd		= elf32-loongarch
 3064bit-bfd		= elf64-loongarch
 3132bit-emul		= elf32loongarch
 3264bit-emul		= elf64loongarch
 33
 34CC_FLAGS_FPU		:= -mfpu=64
 35CC_FLAGS_NO_FPU		:= -msoft-float
 36
 37ifdef CONFIG_UNWINDER_ORC
 38orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h
 39orc_hash_sh := $(srctree)/scripts/orc_hash.sh
 40targets += $(orc_hash_h)
 41quiet_cmd_orc_hash = GEN     $@
 42      cmd_orc_hash = mkdir -p $(dir $@); \
 43		     $(CONFIG_SHELL) $(orc_hash_sh) < $< > $@
 44$(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE
 45	$(call if_changed,orc_hash)
 46archprepare: $(orc_hash_h)
 47endif
 48
 49ifdef CONFIG_DYNAMIC_FTRACE
 50KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
 51CC_FLAGS_FTRACE := -fpatchable-function-entry=2
 52endif
 53
 54ifdef CONFIG_64BIT
 55tool-archpref		= $(64bit-tool-archpref)
 56UTS_MACHINE		:= loongarch64
 57endif
 58
 59ifneq ($(SUBARCH),$(ARCH))
 60  ifeq ($(CROSS_COMPILE),)
 61    CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
 62  endif
 63endif
 64
 65ifdef CONFIG_64BIT
 66ld-emul			= $(64bit-emul)
 67cflags-y		+= -mabi=lp64s -mcmodel=normal
 68endif
 69
 70cflags-y			+= -pipe $(CC_FLAGS_NO_FPU)
 71LDFLAGS_vmlinux			+= -static -n -nostdlib
 72
 73# When the assembler supports explicit relocation hint, we must use it.
 74# GCC may have -mexplicit-relocs off by default if it was built with an old
 75# assembler, so we force it via an option.
 76#
 77# When the assembler does not supports explicit relocation hint, we can't use
 78# it.  Disable it if the compiler supports it.
 79#
 80# The combination of a "new" assembler and "old" GCC is not supported, given
 81# the rarity of this combo and the extra complexity needed to make it work.
 82# Either upgrade the compiler or downgrade the assembler; the build will error
 83# out if it is the case (by probing for the model attribute; all supported
 84# compilers in this case would have support).
 85#
 86# Also, -mdirect-extern-access is useful in case of building with explicit
 87# relocs, for avoiding unnecessary GOT accesses. It is harmless to not have
 88# support though.
 89ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
 90cflags-y			+= $(call cc-option,-mexplicit-relocs)
 91KBUILD_CFLAGS_KERNEL		+= $(call cc-option,-mdirect-extern-access)
 92KBUILD_CFLAGS_KERNEL		+= $(call cc-option,-fdirect-access-external-data)
 93KBUILD_AFLAGS_MODULE		+= $(call cc-option,-fno-direct-access-external-data)
 94KBUILD_CFLAGS_MODULE		+= $(call cc-option,-fno-direct-access-external-data)
 95else
 96cflags-y			+= $(call cc-option,-mno-explicit-relocs)
 97KBUILD_AFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel
 98KBUILD_CFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel
 99KBUILD_AFLAGS_MODULE		+= -Wa,-mla-global-with-abs
100KBUILD_CFLAGS_MODULE		+= -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
101endif
102
103KBUILD_AFLAGS			+= $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
104KBUILD_CFLAGS			+= $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
105KBUILD_AFLAGS			+= $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
106KBUILD_CFLAGS			+= $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
107
108ifdef CONFIG_OBJTOOL
109ifdef CONFIG_CC_HAS_ANNOTATE_TABLEJUMP
110KBUILD_CFLAGS			+= -mannotate-tablejump
111else
112KBUILD_CFLAGS			+= -fno-jump-tables # keep compatibility with older compilers
113endif
114ifdef CONFIG_RUSTC_HAS_ANNOTATE_TABLEJUMP
115KBUILD_RUSTFLAGS		+= -Cllvm-args=--loongarch-annotate-tablejump
116else
117KBUILD_RUSTFLAGS		+= $(if $(call rustc-min-version,109300),-Cjump-tables=n,-Zno-jump-tables) # keep compatibility with older compilers
118endif
119ifdef CONFIG_LTO_CLANG
120# The annotate-tablejump option can not be passed to LLVM backend when LTO is enabled.
121# Ensure it is aware of linker with LTO, '--loongarch-annotate-tablejump' also needs to
122# be passed via '-mllvm' to ld.lld.
123KBUILD_LDFLAGS			+= $(call ld-option,-mllvm --loongarch-annotate-tablejump)
124endif
125endif
126
127KBUILD_RUSTFLAGS		+= --target=loongarch64-unknown-none-softfloat -Ccode-model=small
128KBUILD_RUSTFLAGS_KERNEL		+= -Zdirect-access-external-data=yes
129KBUILD_RUSTFLAGS_MODULE		+= -Zdirect-access-external-data=no
130
131ifeq ($(CONFIG_RELOCATABLE),y)
132KBUILD_CFLAGS_KERNEL		+= -fPIE
133KBUILD_RUSTFLAGS_KERNEL		+= -Crelocation-model=pie
134LDFLAGS_vmlinux			+= -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
135endif
136
137cflags-y += $(call cc-option, -mno-check-zero-division -fno-isolate-erroneous-paths-dereference)
138
139ifndef CONFIG_KASAN
140cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset
141endif
142
143load-y		= 0x9000000000200000
144bootvars-y	= VMLINUX_LOAD_ADDRESS=$(load-y)
145
146drivers-$(CONFIG_PCI)		+= arch/loongarch/pci/
147
148KBUILD_AFLAGS	+= $(cflags-y)
149KBUILD_CFLAGS	+= $(cflags-y)
150KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
151
152# This is required to get dwarf unwinding tables into .debug_frame
153# instead of .eh_frame so we don't discard them.
154KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
155
156ifdef CONFIG_ARCH_STRICT_ALIGN
157# Don't emit unaligned accesses.
158# Not all LoongArch cores support unaligned access, and as kernel we can't
159# rely on others to provide emulation for these accesses.
160KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
161else
162# Optimise for performance on hardware supports unaligned access.
163KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
164endif
165
166KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
167
168KBUILD_LDFLAGS	+= -m $(ld-emul)
169
170ifdef need-compiler
171CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
172	grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
173	sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
174endif
175
176libs-y += arch/loongarch/lib/
177libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
178
179drivers-y		+= arch/loongarch/crypto/
180
181# suspend and hibernation support
182drivers-$(CONFIG_PM)	+= arch/loongarch/power/
183
184ifeq ($(KBUILD_EXTMOD),)
185prepare: vdso_prepare
186vdso_prepare: prepare0
187	$(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
188endif
189
190vdso-install-y += arch/loongarch/vdso/vdso.so.dbg
191
192all:	$(notdir $(KBUILD_IMAGE)) $(KBUILD_DTBS)
193
194vmlinuz.efi: vmlinux.efi
195
196vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
197	$(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
198
199install:
200	$(call cmd,install)
201
202define archhelp
203	echo '  vmlinux.elf    - Uncompressed ELF kernel image (arch/loongarch/boot/vmlinux.elf)'
204	echo '  vmlinux.efi    - Uncompressed EFI kernel image (arch/loongarch/boot/vmlinux.efi)'
205	echo '  vmlinuz.efi    - GZIP/ZSTD-compressed EFI kernel image (arch/loongarch/boot/vmlinuz.efi)'
206	echo '                   Default when CONFIG_EFI_ZBOOT=y'
207	echo '  install        - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or'
208	echo '                   (distribution) /sbin/$(INSTALLKERNEL) or install.sh to $$(INSTALL_PATH)'
209	echo
210endef