tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1# This file is included by the global makefile so that you can add your own
2# architecture-specific flags and dependencies.
3#
4# This file is subject to the terms and conditions of the GNU General Public
5# License. See the file "COPYING" in the main directory of this archive
6# for more details.
7#
8
9LDFLAGS_vmlinux := -z norelro
10ifeq ($(CONFIG_RELOCATABLE),y)
11 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext
12 KBUILD_CFLAGS += -fPIE
13endif
14ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
15 LDFLAGS_vmlinux += --no-relax
16 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
17ifeq ($(CONFIG_RISCV_ISA_C),y)
18 CC_FLAGS_FTRACE := -fpatchable-function-entry=8,4
19else
20 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
21endif
22endif
23
24ifeq ($(CONFIG_CMODEL_MEDLOW),y)
25KBUILD_CFLAGS_MODULE += -mcmodel=medany
26endif
27
28export BITS
29ifeq ($(CONFIG_ARCH_RV64I),y)
30 BITS := 64
31 UTS_MACHINE := riscv64
32
33 KBUILD_CFLAGS += -mabi=lp64
34 KBUILD_AFLAGS += -mabi=lp64
35
36 KBUILD_LDFLAGS += -melf64lriscv
37
38 KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv64 --target=riscv64imac-unknown-none-elf \
39 -Cno-redzone
40else
41 BITS := 32
42 UTS_MACHINE := riscv32
43
44 KBUILD_CFLAGS += -mabi=ilp32
45 KBUILD_AFLAGS += -mabi=ilp32
46 KBUILD_LDFLAGS += -melf32lriscv
47endif
48
49# LLVM has an issue with target-features and LTO: https://github.com/llvm/llvm-project/issues/59350
50# Ensure it is aware of linker relaxation with LTO, otherwise relocations may
51# be incorrect: https://github.com/llvm/llvm-project/issues/65090
52ifeq ($(CONFIG_LTO_CLANG),y)
53 KBUILD_LDFLAGS += -mllvm -mattr=+c -mllvm -mattr=+relax
54endif
55
56ifeq ($(CONFIG_SHADOW_CALL_STACK),y)
57 KBUILD_LDFLAGS += --no-relax-gp
58endif
59
60# ISA string setting
61riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima
62riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima
63riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd
64riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
65riscv-march-$(CONFIG_RISCV_ISA_V) := $(riscv-march-y)v
66
67ifneq ($(CONFIG_RISCV_ISA_C),y)
68 KBUILD_RUSTFLAGS += -Ctarget-feature=-c
69endif
70
71ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
72KBUILD_CFLAGS += -Wa,-misa-spec=2.2
73KBUILD_AFLAGS += -Wa,-misa-spec=2.2
74else
75riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
76endif
77
78# Check if the toolchain supports Zacas
79riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZACAS) := $(riscv-march-y)_zacas
80
81# Check if the toolchain supports Zabha
82riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZABHA) := $(riscv-march-y)_zabha
83
84KBUILD_BASE_ISA = -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
85export KBUILD_BASE_ISA
86
87# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
88# matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
89KBUILD_CFLAGS += $(KBUILD_BASE_ISA)
90
91KBUILD_AFLAGS += -march=$(riscv-march-y)
92
93# For C code built with floating-point support, exclude V but keep F and D.
94CC_FLAGS_FPU := -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)([^v_]*)v?/\1\2/')
95
96KBUILD_CFLAGS += -mno-save-restore
97
98ifeq ($(CONFIG_CMODEL_MEDLOW),y)
99 KBUILD_CFLAGS += -mcmodel=medlow
100endif
101ifeq ($(CONFIG_CMODEL_MEDANY),y)
102 KBUILD_CFLAGS += -mcmodel=medany
103endif
104
105# Avoid generating .eh_frame sections.
106KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
107
108# The RISC-V attributes frequently cause compatibility issues and provide no
109# information, so just turn them off.
110KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
111KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
112KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
113KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
114
115KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
116KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
117
118# GCC versions that support the "-mstrict-align" option default to allowing
119# unaligned accesses. While unaligned accesses are explicitly allowed in the
120# RISC-V ISA, they're emulated by machine mode traps on all extant
121# architectures. It's faster to have GCC emit only aligned accesses.
122ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y)
123KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
124endif
125
126ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
127prepare: stack_protector_prepare
128stack_protector_prepare: prepare0
129 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \
130 -mstack-protector-guard-reg=tp \
131 -mstack-protector-guard-offset=$(shell \
132 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
133 $(objtree)/include/generated/asm-offsets.h))
134endif
135
136# arch specific predefines for sparse
137CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
138
139# Default target when executing plain make
140boot := arch/riscv/boot
141boot-image-y := Image
142boot-image-$(CONFIG_KERNEL_BZIP2) := Image.bz2
143boot-image-$(CONFIG_KERNEL_GZIP) := Image.gz
144boot-image-$(CONFIG_KERNEL_LZ4) := Image.lz4
145boot-image-$(CONFIG_KERNEL_LZMA) := Image.lzma
146boot-image-$(CONFIG_KERNEL_LZO) := Image.lzo
147boot-image-$(CONFIG_KERNEL_ZSTD) := Image.zst
148boot-image-$(CONFIG_KERNEL_XZ) := Image.xz
149ifdef CONFIG_RISCV_M_MODE
150boot-image-$(CONFIG_SOC_CANAAN_K210) := loader.bin
151endif
152boot-image-$(CONFIG_EFI_ZBOOT) := vmlinuz.efi
153boot-image-$(CONFIG_XIP_KERNEL) := xipImage
154KBUILD_IMAGE := $(boot)/$(boot-image-y)
155
156libs-y += arch/riscv/lib/
157libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
158
159ifeq ($(KBUILD_EXTMOD),)
160ifeq ($(CONFIG_MMU),y)
161prepare: vdso_prepare
162vdso_prepare: prepare0
163 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
164 $(if $(CONFIG_RISCV_USER_CFI),$(Q)$(MAKE) \
165 $(build)=arch/riscv/kernel/vdso_cfi include/generated/vdso-cfi-offsets.h)
166 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
167 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
168
169endif
170endif
171
172vdso-install-y += arch/riscv/kernel/vdso/vdso.so.dbg
173vdso-install-$(CONFIG_RISCV_USER_CFI) += arch/riscv/kernel/vdso_cfi/vdso-cfi.so.dbg
174vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg
175
176BOOT_TARGETS := Image Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader loader.bin xipImage vmlinuz.efi
177
178all: $(notdir $(KBUILD_IMAGE))
179
180loader.bin: loader
181Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader xipImage vmlinuz.efi: Image
182
183$(BOOT_TARGETS): vmlinux
184 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
185 @$(kecho) ' Kernel: $(boot)/$@ is ready'
186
187# the install target always installs KBUILD_IMAGE (which may be compressed)
188# but keep the zinstall target for compatibility with older releases
189install zinstall:
190 $(call cmd,install)
191
192PHONY += rv32_randconfig
193rv32_randconfig:
194 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
195 -f $(srctree)/Makefile randconfig
196
197PHONY += rv64_randconfig
198rv64_randconfig:
199 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
200 -f $(srctree)/Makefile randconfig
201
202PHONY += rv32_defconfig
203rv32_defconfig:
204 $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
205
206PHONY += rv32_nommu_virt_defconfig
207rv32_nommu_virt_defconfig:
208 $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config
209
210define archhelp
211 echo ' Image - Uncompressed kernel image (arch/riscv/boot/Image)'
212 echo ' Image.gz - Compressed kernel image (arch/riscv/boot/Image.gz)'
213 echo ' Image.bz2 - Compressed kernel image (arch/riscv/boot/Image.bz2)'
214 echo ' Image.lz4 - Compressed kernel image (arch/riscv/boot/Image.lz4)'
215 echo ' Image.lzma - Compressed kernel image (arch/riscv/boot/Image.lzma)'
216 echo ' Image.lzo - Compressed kernel image (arch/riscv/boot/Image.lzo)'
217 echo ' Image.zst - Compressed kernel image (arch/riscv/boot/Image.zst)'
218 echo ' Image.xz - Compressed kernel image (arch/riscv/boot/Image.xz)'
219 echo ' vmlinuz.efi - Compressed EFI kernel image (arch/riscv/boot/vmlinuz.efi)'
220 echo ' Default when CONFIG_EFI_ZBOOT=y'
221 echo ' xipImage - Execute-in-place kernel image (arch/riscv/boot/xipImage)'
222 echo ' Default when CONFIG_XIP_KERNEL=y'
223 echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or'
224 echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to '
225 echo ' $$(INSTALL_PATH)'
226endef