xref: /openbmc/linux/arch/riscv/Makefile (revision 1cb8f3e2d8fe7533c26df9925a83bd3d185b312e)
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 
11 OBJCOPYFLAGS    := -O binary
12 LDFLAGS_vmlinux :=
13 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
14 	LDFLAGS_vmlinux := --no-relax
15 	KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
16 	CC_FLAGS_FTRACE := -fpatchable-function-entry=8
17 endif
18 
19 ifeq ($(CONFIG_64BIT)$(CONFIG_CMODEL_MEDLOW),yy)
20 KBUILD_CFLAGS_MODULE += -mcmodel=medany
21 endif
22 
23 export BITS
24 ifeq ($(CONFIG_ARCH_RV64I),y)
25 	BITS := 64
26 	UTS_MACHINE := riscv64
27 
28 	KBUILD_CFLAGS += -mabi=lp64
29 	KBUILD_AFLAGS += -mabi=lp64
30 
31 	KBUILD_LDFLAGS += -melf64lriscv
32 else
33 	BITS := 32
34 	UTS_MACHINE := riscv32
35 
36 	KBUILD_CFLAGS += -mabi=ilp32
37 	KBUILD_AFLAGS += -mabi=ilp32
38 	KBUILD_LDFLAGS += -melf32lriscv
39 endif
40 
41 # ISA string setting
42 riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
43 riscv-march-$(CONFIG_ARCH_RV64I)	:= rv64ima
44 riscv-march-$(CONFIG_FPU)		:= $(riscv-march-y)fd
45 riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)c
46 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
47 KBUILD_AFLAGS += -march=$(riscv-march-y)
48 
49 KBUILD_CFLAGS += -mno-save-restore
50 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
51 
52 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
53 	KBUILD_CFLAGS += -mcmodel=medlow
54 endif
55 ifeq ($(CONFIG_CMODEL_MEDANY),y)
56 	KBUILD_CFLAGS += -mcmodel=medany
57 endif
58 ifeq ($(CONFIG_PERF_EVENTS),y)
59         KBUILD_CFLAGS += -fno-omit-frame-pointer
60 endif
61 
62 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
63 
64 # GCC versions that support the "-mstrict-align" option default to allowing
65 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
66 # RISC-V ISA, they're emulated by machine mode traps on all extant
67 # architectures.  It's faster to have GCC emit only aligned accesses.
68 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
69 
70 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
71 prepare: stack_protector_prepare
72 stack_protector_prepare: prepare0
73 	$(eval KBUILD_CFLAGS += -mstack-protector-guard=tls		  \
74 				-mstack-protector-guard-reg=tp		  \
75 				-mstack-protector-guard-offset=$(shell	  \
76 			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
77 					include/generated/asm-offsets.h))
78 endif
79 
80 # arch specific predefines for sparse
81 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
82 
83 # Default target when executing plain make
84 boot		:= arch/riscv/boot
85 KBUILD_IMAGE	:= $(boot)/Image.gz
86 
87 head-y := arch/riscv/kernel/head.o
88 
89 core-y += arch/riscv/
90 
91 libs-y += arch/riscv/lib/
92 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
93 
94 PHONY += vdso_install
95 vdso_install:
96 	$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
97 
98 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
99 KBUILD_IMAGE := $(boot)/loader.bin
100 else
101 KBUILD_IMAGE := $(boot)/Image.gz
102 endif
103 BOOT_TARGETS := Image Image.gz loader loader.bin
104 
105 all:	$(notdir $(KBUILD_IMAGE))
106 
107 $(BOOT_TARGETS): vmlinux
108 	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
109 	@$(kecho) '  Kernel: $(boot)/$@ is ready'
110 
111 Image.%: Image
112 	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
113 
114 zinstall install:
115 	$(Q)$(MAKE) $(build)=$(boot) $@
116 
117 archclean:
118 	$(Q)$(MAKE) $(clean)=$(boot)
119