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 ($(CONFIG_RELOCATABLE),y)
11	LDFLAGS_vmlinux += -shared -Bsymbolic -z notext --emit-relocs
12	KBUILD_CFLAGS += -fPIE
13endif
14ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
15	LDFLAGS_vmlinux += --no-relax
16	KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
17ifeq ($(CONFIG_RISCV_ISA_C),y)
18	CC_FLAGS_FTRACE := -fpatchable-function-entry=4
19else
20	CC_FLAGS_FTRACE := -fpatchable-function-entry=2
21endif
22endif
23
24ifeq ($(CONFIG_CMODEL_MEDLOW),y)
25KBUILD_CFLAGS_MODULE += -mcmodel=medany
26endif
27
28export BITS
29ifeq ($(CONFIG_ARCH_RV64I),y)
30	BITS := 64
31	UTS_MACHINE := riscv64
32
33	KBUILD_CFLAGS += -mabi=lp64
34	KBUILD_AFLAGS += -mabi=lp64
35
36	KBUILD_LDFLAGS += -melf64lriscv
37else
38	BITS := 32
39	UTS_MACHINE := riscv32
40
41	KBUILD_CFLAGS += -mabi=ilp32
42	KBUILD_AFLAGS += -mabi=ilp32
43	KBUILD_LDFLAGS += -melf32lriscv
44endif
45
46ifndef CONFIG_RISCV_USE_LINKER_RELAXATION
47	KBUILD_CFLAGS += -mno-relax
48	KBUILD_AFLAGS += -mno-relax
49ifndef CONFIG_AS_IS_LLVM
50	KBUILD_CFLAGS += -Wa,-mno-relax
51	KBUILD_AFLAGS += -Wa,-mno-relax
52endif
53# LLVM has an issue with target-features and LTO: https://github.com/llvm/llvm-project/issues/59350
54# Ensure it is aware of linker relaxation with LTO, otherwise relocations may
55# be incorrect: https://github.com/llvm/llvm-project/issues/65090
56else ifeq ($(CONFIG_LTO_CLANG),y)
57	KBUILD_LDFLAGS += -mllvm -mattr=+c -mllvm -mattr=+relax
58endif
59
60ifeq ($(CONFIG_SHADOW_CALL_STACK),y)
61	KBUILD_LDFLAGS += --no-relax-gp
62endif
63
64# ISA string setting
65riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
66riscv-march-$(CONFIG_ARCH_RV64I)	:= rv64ima
67riscv-march-$(CONFIG_FPU)		:= $(riscv-march-y)fd
68riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)c
69riscv-march-$(CONFIG_RISCV_ISA_V)	:= $(riscv-march-y)v
70
71ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
72KBUILD_CFLAGS += -Wa,-misa-spec=2.2
73KBUILD_AFLAGS += -Wa,-misa-spec=2.2
74else
75riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
76endif
77
78# Check if the toolchain supports Zihintpause extension
79riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
80
81# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
82# matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
83KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
84
85KBUILD_AFLAGS += -march=$(riscv-march-y)
86
87KBUILD_CFLAGS += -mno-save-restore
88KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
89
90ifeq ($(CONFIG_CMODEL_MEDLOW),y)
91	KBUILD_CFLAGS += -mcmodel=medlow
92endif
93ifeq ($(CONFIG_CMODEL_MEDANY),y)
94	KBUILD_CFLAGS += -mcmodel=medany
95endif
96
97# Avoid generating .eh_frame sections.
98KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
99
100# The RISC-V attributes frequently cause compatibility issues and provide no
101# information, so just turn them off.
102KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
103KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
104KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
105KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
106
107KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
108KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
109
110# GCC versions that support the "-mstrict-align" option default to allowing
111# unaligned accesses.  While unaligned accesses are explicitly allowed in the
112# RISC-V ISA, they're emulated by machine mode traps on all extant
113# architectures.  It's faster to have GCC emit only aligned accesses.
114ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y)
115KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
116endif
117
118ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
119prepare: stack_protector_prepare
120stack_protector_prepare: prepare0
121	$(eval KBUILD_CFLAGS += -mstack-protector-guard=tls		  \
122				-mstack-protector-guard-reg=tp		  \
123				-mstack-protector-guard-offset=$(shell	  \
124			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
125					include/generated/asm-offsets.h))
126endif
127
128# arch specific predefines for sparse
129CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
130
131# Default target when executing plain make
132boot		:= arch/riscv/boot
133ifeq ($(CONFIG_XIP_KERNEL),y)
134KBUILD_IMAGE := $(boot)/xipImage
135else
136KBUILD_IMAGE	:= $(boot)/Image.gz
137endif
138
139libs-y += arch/riscv/lib/
140libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
141
142ifeq ($(KBUILD_EXTMOD),)
143ifeq ($(CONFIG_MMU),y)
144prepare: vdso_prepare
145vdso_prepare: prepare0
146	$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
147	$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
148		$(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
149
150endif
151endif
152
153vdso-install-y			+= arch/riscv/kernel/vdso/vdso.so.dbg
154vdso-install-$(CONFIG_COMPAT)	+= arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg
155
156ifneq ($(CONFIG_XIP_KERNEL),y)
157ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
158KBUILD_IMAGE := $(boot)/loader.bin
159else
160ifeq ($(CONFIG_EFI_ZBOOT),)
161KBUILD_IMAGE := $(boot)/Image.gz
162else
163KBUILD_IMAGE := $(boot)/vmlinuz.efi
164endif
165endif
166endif
167BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
168
169all:	$(notdir $(KBUILD_IMAGE))
170
171loader.bin: loader
172Image.gz loader vmlinuz.efi: Image
173$(BOOT_TARGETS): vmlinux
174	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
175	@$(kecho) '  Kernel: $(boot)/$@ is ready'
176
177Image.%: Image
178	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
179
180install: KBUILD_IMAGE := $(boot)/Image
181zinstall: KBUILD_IMAGE := $(boot)/Image.gz
182install zinstall:
183	$(call cmd,install)
184
185PHONY += rv32_randconfig
186rv32_randconfig:
187	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
188		-f $(srctree)/Makefile randconfig
189
190PHONY += rv64_randconfig
191rv64_randconfig:
192	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
193		-f $(srctree)/Makefile randconfig
194
195PHONY += rv32_defconfig
196rv32_defconfig:
197	$(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
198
199PHONY += rv32_nommu_virt_defconfig
200rv32_nommu_virt_defconfig:
201	$(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config
202