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1# This file is included by the global makefile so that you can add your own
2# architecture-specific flags and dependencies. Remember to do have actions
3# for "archclean" and "archdep" for cleaning up and making dependencies for
4# this architecture
5#
6# This file is subject to the terms and conditions of the GNU General Public
7# License.  See the file "COPYING" in the main directory of this archive
8# for more details.
9#
10
11OBJCOPYFLAGS    := -O binary
12LDFLAGS_vmlinux :=
13ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
14	LDFLAGS_vmlinux := --no-relax
15	KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
16ifeq ($(CONFIG_RISCV_ISA_C),y)
17	CC_FLAGS_FTRACE := -fpatchable-function-entry=4
18else
19	CC_FLAGS_FTRACE := -fpatchable-function-entry=2
20endif
21endif
22
23ifeq ($(CONFIG_CMODEL_MEDLOW),y)
24KBUILD_CFLAGS_MODULE += -mcmodel=medany
25endif
26
27export BITS
28ifeq ($(CONFIG_ARCH_RV64I),y)
29	BITS := 64
30	UTS_MACHINE := riscv64
31
32	KBUILD_CFLAGS += -mabi=lp64
33	KBUILD_AFLAGS += -mabi=lp64
34
35	KBUILD_LDFLAGS += -melf64lriscv
36else
37	BITS := 32
38	UTS_MACHINE := riscv32
39
40	KBUILD_CFLAGS += -mabi=ilp32
41	KBUILD_AFLAGS += -mabi=ilp32
42	KBUILD_LDFLAGS += -melf32lriscv
43endif
44
45ifeq ($(CONFIG_LD_IS_LLD),y)
46ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
47	KBUILD_CFLAGS += -mno-relax
48	KBUILD_AFLAGS += -mno-relax
49ifndef CONFIG_AS_IS_LLVM
50	KBUILD_CFLAGS += -Wa,-mno-relax
51	KBUILD_AFLAGS += -Wa,-mno-relax
52endif
53endif
54endif
55
56# ISA string setting
57riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
58riscv-march-$(CONFIG_ARCH_RV64I)	:= rv64ima
59riscv-march-$(CONFIG_FPU)		:= $(riscv-march-y)fd
60riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)c
61
62ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
63KBUILD_CFLAGS += -Wa,-misa-spec=2.2
64KBUILD_AFLAGS += -Wa,-misa-spec=2.2
65else
66riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
67endif
68
69KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
70KBUILD_AFLAGS += -march=$(riscv-march-y)
71
72KBUILD_CFLAGS += -mno-save-restore
73KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
74
75ifeq ($(CONFIG_CMODEL_MEDLOW),y)
76	KBUILD_CFLAGS += -mcmodel=medlow
77endif
78ifeq ($(CONFIG_CMODEL_MEDANY),y)
79	KBUILD_CFLAGS += -mcmodel=medany
80endif
81ifeq ($(CONFIG_PERF_EVENTS),y)
82        KBUILD_CFLAGS += -fno-omit-frame-pointer
83endif
84
85# Avoid generating .eh_frame sections.
86KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
87
88KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
89KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
90
91# GCC versions that support the "-mstrict-align" option default to allowing
92# unaligned accesses.  While unaligned accesses are explicitly allowed in the
93# RISC-V ISA, they're emulated by machine mode traps on all extant
94# architectures.  It's faster to have GCC emit only aligned accesses.
95KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
96
97ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
98prepare: stack_protector_prepare
99stack_protector_prepare: prepare0
100	$(eval KBUILD_CFLAGS += -mstack-protector-guard=tls		  \
101				-mstack-protector-guard-reg=tp		  \
102				-mstack-protector-guard-offset=$(shell	  \
103			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
104					include/generated/asm-offsets.h))
105endif
106
107# arch specific predefines for sparse
108CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
109
110# Default target when executing plain make
111boot		:= arch/riscv/boot
112ifeq ($(CONFIG_XIP_KERNEL),y)
113KBUILD_IMAGE := $(boot)/xipImage
114else
115KBUILD_IMAGE	:= $(boot)/Image.gz
116endif
117
118head-y := arch/riscv/kernel/head.o
119
120core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/
121
122libs-y += arch/riscv/lib/
123libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
124
125PHONY += vdso_install
126vdso_install:
127	$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
128
129ifeq ($(KBUILD_EXTMOD),)
130ifeq ($(CONFIG_MMU),y)
131prepare: vdso_prepare
132vdso_prepare: prepare0
133	$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
134endif
135endif
136
137ifneq ($(CONFIG_XIP_KERNEL),y)
138ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
139KBUILD_IMAGE := $(boot)/loader.bin
140else
141KBUILD_IMAGE := $(boot)/Image.gz
142endif
143endif
144BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
145
146all:	$(notdir $(KBUILD_IMAGE))
147
148$(BOOT_TARGETS): vmlinux
149	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
150	@$(kecho) '  Kernel: $(boot)/$@ is ready'
151
152Image.%: Image
153	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
154
155install: install-image = Image
156zinstall: install-image = Image.gz
157install zinstall:
158	$(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
159	$(boot)/$(install-image) System.map "$(INSTALL_PATH)"
160
161archclean:
162	$(Q)$(MAKE) $(clean)=$(boot)
163