xref: /openbmc/linux/arch/loongarch/Makefile (revision a8f54d94) 
1# SPDX-License-Identifier: GPL-2.0
2#
3# Author: Huacai Chen <chenhuacai@loongson.cn>
4# Copyright (C) 2020-2022 Loongson Technology Corporation Limited
5
6boot	:= arch/loongarch/boot
7
8KBUILD_DEFCONFIG := loongson3_defconfig
9
10image-name-y			:= vmlinux
11image-name-$(CONFIG_EFI_ZBOOT)	:= vmlinuz
12
13ifndef CONFIG_EFI_STUB
14KBUILD_IMAGE	:= $(boot)/vmlinux.elf
15else
16KBUILD_IMAGE	:= $(boot)/$(image-name-y).efi
17endif
18
19#
20# Select the object file format to substitute into the linker script.
21#
2264bit-tool-archpref	= loongarch64
2332bit-bfd		= elf32-loongarch
2464bit-bfd		= elf64-loongarch
2532bit-emul		= elf32loongarch
2664bit-emul		= elf64loongarch
27
28ifdef CONFIG_DYNAMIC_FTRACE
29KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
30CC_FLAGS_FTRACE := -fpatchable-function-entry=2
31endif
32
33ifdef CONFIG_64BIT
34tool-archpref		= $(64bit-tool-archpref)
35UTS_MACHINE		:= loongarch64
36endif
37
38ifneq ($(SUBARCH),$(ARCH))
39  ifeq ($(CROSS_COMPILE),)
40    CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
41  endif
42endif
43
44ifdef CONFIG_64BIT
45ld-emul			= $(64bit-emul)
46cflags-y		+= -mabi=lp64s
47endif
48
49cflags-y			+= -G0 -pipe -msoft-float
50LDFLAGS_vmlinux			+= -G0 -static -n -nostdlib
51
52# When the assembler supports explicit relocation hint, we must use it.
53# GCC may have -mexplicit-relocs off by default if it was built with an old
54# assembler, so we force it via an option.
55#
56# When the assembler does not supports explicit relocation hint, we can't use
57# it.  Disable it if the compiler supports it.
58#
59# If you've seen "unknown reloc hint" message building the kernel and you are
60# now wondering why "-mexplicit-relocs" is not wrapped with cc-option: the
61# combination of a "new" assembler and "old" compiler is not supported.  Either
62# upgrade the compiler or downgrade the assembler.
63ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
64cflags-y			+= -mexplicit-relocs
65KBUILD_CFLAGS_KERNEL		+= -mdirect-extern-access
66else
67cflags-y			+= $(call cc-option,-mno-explicit-relocs)
68KBUILD_AFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel
69KBUILD_CFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel
70KBUILD_AFLAGS_MODULE		+= -Wa,-mla-global-with-abs
71KBUILD_CFLAGS_MODULE		+= -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
72endif
73
74cflags-y += -ffreestanding
75cflags-y += $(call cc-option, -mno-check-zero-division)
76
77ifndef CONFIG_PHYSICAL_START
78load-y		= 0x9000000000200000
79else
80load-y		= $(CONFIG_PHYSICAL_START)
81endif
82bootvars-y	= VMLINUX_LOAD_ADDRESS=$(load-y)
83
84drivers-$(CONFIG_PCI)		+= arch/loongarch/pci/
85
86KBUILD_AFLAGS	+= $(cflags-y)
87KBUILD_CFLAGS	+= $(cflags-y)
88KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
89
90# This is required to get dwarf unwinding tables into .debug_frame
91# instead of .eh_frame so we don't discard them.
92KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
93
94# Don't emit unaligned accesses.
95# Not all LoongArch cores support unaligned access, and as kernel we can't
96# rely on others to provide emulation for these accesses.
97KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
98
99KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
100
101KBUILD_LDFLAGS	+= -m $(ld-emul)
102
103ifdef CONFIG_LOONGARCH
104CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
105	grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
106	sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
107endif
108
109libs-y += arch/loongarch/lib/
110libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
111
112# suspend and hibernation support
113drivers-$(CONFIG_PM)	+= arch/loongarch/power/
114
115ifeq ($(KBUILD_EXTMOD),)
116prepare: vdso_prepare
117vdso_prepare: prepare0
118	$(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
119endif
120
121PHONY += vdso_install
122vdso_install:
123	$(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
124
125all:	$(notdir $(KBUILD_IMAGE))
126
127vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
128	$(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
129
130install:
131	$(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
132	$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
133	$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
134
135define archhelp
136	echo '  install              - install kernel into $(INSTALL_PATH)'
137	echo
138endef
139