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. 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 ($(CONFIG_DYNAMIC_FTRACE),y)
14 LDFLAGS_vmlinux := --no-relax
15 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
16 CC_FLAGS_FTRACE := -fpatchable-function-entry=8
17endif
18
19ifeq ($(CONFIG_64BIT)$(CONFIG_CMODEL_MEDLOW),yy)
20KBUILD_CFLAGS_MODULE += -mcmodel=medany
21endif
22
23export BITS
24ifeq ($(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
32else
33 BITS := 32
34 UTS_MACHINE := riscv32
35
36 KBUILD_CFLAGS += -mabi=ilp32
37 KBUILD_AFLAGS += -mabi=ilp32
38 KBUILD_LDFLAGS += -melf32lriscv
39endif
40
41# ISA string setting
42riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima
43riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima
44riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd
45riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
46KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
47KBUILD_AFLAGS += -march=$(riscv-march-y)
48
49KBUILD_CFLAGS += -mno-save-restore
50KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
51
52ifeq ($(CONFIG_CMODEL_MEDLOW),y)
53 KBUILD_CFLAGS += -mcmodel=medlow
54endif
55ifeq ($(CONFIG_CMODEL_MEDANY),y)
56 KBUILD_CFLAGS += -mcmodel=medany
57endif
58ifeq ($(CONFIG_PERF_EVENTS),y)
59 KBUILD_CFLAGS += -fno-omit-frame-pointer
60endif
61
62KBUILD_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.
68KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
69
70ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
71prepare: stack_protector_prepare
72stack_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))
78endif
79
80# arch specific predefines for sparse
81CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
82
83# Default target when executing plain make
84boot := arch/riscv/boot
85KBUILD_IMAGE := $(boot)/Image.gz
86
87head-y := arch/riscv/kernel/head.o
88
89core-y += arch/riscv/
90
91libs-y += arch/riscv/lib/
92libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
93
94PHONY += vdso_install
95vdso_install:
96 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
97
98ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
99KBUILD_IMAGE := $(boot)/loader.bin
100else
101KBUILD_IMAGE := $(boot)/Image.gz
102endif
103BOOT_TARGETS := Image Image.gz loader loader.bin
104
105all: $(notdir $(KBUILD_IMAGE))
106
107$(BOOT_TARGETS): vmlinux
108 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
109 @$(kecho) ' Kernel: $(boot)/$@ is ready'
110
111Image.%: Image
112 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
113
114zinstall install:
115 $(Q)$(MAKE) $(build)=$(boot) $@
116
117archclean:
118 $(Q)$(MAKE) $(clean)=$(boot)