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