xref: /openbmc/linux/arch/loongarch/Makefile (revision 59e09100) 
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			+= -pipe -msoft-float
50LDFLAGS_vmlinux			+= -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# The combination of a "new" assembler and "old" GCC is not supported, given
60# the rarity of this combo and the extra complexity needed to make it work.
61# Either upgrade the compiler or downgrade the assembler; the build will error
62# out if it is the case (by probing for the model attribute; all supported
63# compilers in this case would have support).
64#
65# Also, -mdirect-extern-access is useful in case of building with explicit
66# relocs, for avoiding unnecessary GOT accesses. It is harmless to not have
67# support though.
68ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
69cflags-y			+= $(call cc-option,-mexplicit-relocs)
70KBUILD_CFLAGS_KERNEL		+= $(call cc-option,-mdirect-extern-access)
71else
72cflags-y			+= $(call cc-option,-mno-explicit-relocs)
73KBUILD_AFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel
74KBUILD_CFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel
75KBUILD_AFLAGS_MODULE		+= -Wa,-mla-global-with-abs
76KBUILD_CFLAGS_MODULE		+= -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
77endif
78
79ifeq ($(CONFIG_RELOCATABLE),y)
80KBUILD_CFLAGS_KERNEL		+= -fPIE
81LDFLAGS_vmlinux			+= -static -pie --no-dynamic-linker -z notext
82endif
83
84cflags-y += -ffreestanding
85cflags-y += $(call cc-option, -mno-check-zero-division)
86
87load-y		= 0x9000000000200000
88bootvars-y	= VMLINUX_LOAD_ADDRESS=$(load-y)
89
90drivers-$(CONFIG_PCI)		+= arch/loongarch/pci/
91
92KBUILD_AFLAGS	+= $(cflags-y)
93KBUILD_CFLAGS	+= $(cflags-y)
94KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
95
96# This is required to get dwarf unwinding tables into .debug_frame
97# instead of .eh_frame so we don't discard them.
98KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
99
100ifdef CONFIG_ARCH_STRICT_ALIGN
101# Don't emit unaligned accesses.
102# Not all LoongArch cores support unaligned access, and as kernel we can't
103# rely on others to provide emulation for these accesses.
104KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
105else
106# Optimise for performance on hardware supports unaligned access.
107KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
108endif
109
110KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
111
112KBUILD_LDFLAGS	+= -m $(ld-emul)
113
114ifdef CONFIG_LOONGARCH
115CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
116	grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
117	sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
118endif
119
120libs-y += arch/loongarch/lib/
121libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
122
123drivers-y		+= arch/loongarch/crypto/
124
125# suspend and hibernation support
126drivers-$(CONFIG_PM)	+= arch/loongarch/power/
127
128ifeq ($(KBUILD_EXTMOD),)
129prepare: vdso_prepare
130vdso_prepare: prepare0
131	$(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
132endif
133
134PHONY += vdso_install
135vdso_install:
136	$(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
137
138all:	$(notdir $(KBUILD_IMAGE))
139
140vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
141	$(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
142
143install:
144	$(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
145	$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
146	$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
147
148define archhelp
149	echo '  install              - install kernel into $(INSTALL_PATH)'
150	echo
151endef
152