Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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
11LDFLAGS :=
12OBJCOPYFLAGS := -O binary
13LDFLAGS_vmlinux :=
14ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
15 LDFLAGS_vmlinux := --no-relax
16endif
17KBUILD_AFLAGS_MODULE += -fPIC
18KBUILD_CFLAGS_MODULE += -fPIC
19
20KBUILD_DEFCONFIG = defconfig
21
22export BITS
23ifeq ($(CONFIG_ARCH_RV64I),y)
24 BITS := 64
25 UTS_MACHINE := riscv64
26
27 KBUILD_CFLAGS += -mabi=lp64
28 KBUILD_AFLAGS += -mabi=lp64
29 KBUILD_MARCH = rv64im
30 LDFLAGS += -melf64lriscv
31else
32 BITS := 32
33 UTS_MACHINE := riscv32
34
35 KBUILD_CFLAGS += -mabi=ilp32
36 KBUILD_AFLAGS += -mabi=ilp32
37 KBUILD_MARCH = rv32im
38 LDFLAGS += -melf32lriscv
39endif
40
41KBUILD_CFLAGS += -Wall
42
43ifeq ($(CONFIG_RISCV_ISA_A),y)
44 KBUILD_ARCH_A = a
45endif
46ifeq ($(CONFIG_RISCV_ISA_C),y)
47 KBUILD_ARCH_C = c
48endif
49
50KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)fd$(KBUILD_ARCH_C)
51
52KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C)
53KBUILD_CFLAGS += -mno-save-restore
54KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
55
56ifeq ($(CONFIG_CMODEL_MEDLOW),y)
57 KBUILD_CFLAGS += -mcmodel=medlow
58endif
59ifeq ($(CONFIG_CMODEL_MEDANY),y)
60 KBUILD_CFLAGS += -mcmodel=medany
61endif
62ifeq ($(CONFIG_MODULE_SECTIONS),y)
63 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds
64endif
65
66KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
67
68# GCC versions that support the "-mstrict-align" option default to allowing
69# unaligned accesses. While unaligned accesses are explicitly allowed in the
70# RISC-V ISA, they're emulated by machine mode traps on all extant
71# architectures. It's faster to have GCC emit only aligned accesses.
72KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
73
74# arch specific predefines for sparse
75CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
76
77head-y := arch/riscv/kernel/head.o
78
79core-y += arch/riscv/kernel/ arch/riscv/mm/
80
81libs-y += arch/riscv/lib/
82
83all: vmlinux