Merge tag 'm68knommu-for-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg...
[platform/kernel/linux-starfive.git] / arch / arm64 / Makefile
1 #
2 # arch/arm64/Makefile
3 #
4 # This file is included by the global makefile so that you can add your own
5 # architecture-specific flags and dependencies.
6 #
7 # This file is subject to the terms and conditions of the GNU General Public
8 # License.  See the file "COPYING" in the main directory of this archive
9 # for more details.
10 #
11 # Copyright (C) 1995-2001 by Russell King
12
13 LDFLAGS_vmlinux :=--no-undefined -X
14
15 ifeq ($(CONFIG_RELOCATABLE), y)
16 # Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
17 # for relative relocs, since this leads to better Image compression
18 # with the relocation offsets always being zero.
19 LDFLAGS_vmlinux         += -shared -Bsymbolic -z notext \
20                         $(call ld-option, --no-apply-dynamic-relocs)
21 endif
22
23 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
24   ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
25 LDFLAGS_vmlinux += --fix-cortex-a53-843419
26   endif
27 endif
28
29 cc_has_k_constraint := $(call try-run,echo                              \
30         'int main(void) {                                               \
31                 asm volatile("and w0, w0, %w0" :: "K" (4294967295));    \
32                 return 0;                                               \
33         }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
34
35 ifeq ($(CONFIG_BROKEN_GAS_INST),y)
36 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
37 endif
38
39 KBUILD_CFLAGS   += -mgeneral-regs-only  \
40                    $(compat_vdso) $(cc_has_k_constraint)
41 KBUILD_CFLAGS   += $(call cc-disable-warning, psabi)
42 KBUILD_AFLAGS   += $(compat_vdso)
43
44 KBUILD_CFLAGS   += $(call cc-option,-mabi=lp64)
45 KBUILD_AFLAGS   += $(call cc-option,-mabi=lp64)
46
47 # Avoid generating .eh_frame* sections.
48 ifneq ($(CONFIG_UNWIND_TABLES),y)
49 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables -fno-unwind-tables
50 KBUILD_AFLAGS   += -fno-asynchronous-unwind-tables -fno-unwind-tables
51 else
52 KBUILD_CFLAGS   += -fasynchronous-unwind-tables
53 KBUILD_AFLAGS   += -fasynchronous-unwind-tables
54 endif
55
56 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
57 prepare: stack_protector_prepare
58 stack_protector_prepare: prepare0
59         $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg            \
60                                 -mstack-protector-guard-reg=sp_el0        \
61                                 -mstack-protector-guard-offset=$(shell    \
62                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
63                                         include/generated/asm-offsets.h))
64 endif
65
66 ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
67   KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
68 else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
69   ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y)
70     KBUILD_CFLAGS += -mbranch-protection=pac-ret
71   else
72     KBUILD_CFLAGS += -msign-return-address=non-leaf
73   endif
74 else
75   KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
76 endif
77
78 # Tell the assembler to support instructions from the latest target
79 # architecture.
80 #
81 # For non-integrated assemblers we'll pass this on the command line, and for
82 # integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for
83 # inline usage.
84 #
85 # We cannot pass the same arch flag to the compiler as this would allow it to
86 # freely generate instructions which are not supported by earlier architecture
87 # versions, which would prevent a single kernel image from working on earlier
88 # hardware.
89 ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
90   asm-arch := armv8.5-a
91 else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
92   asm-arch := armv8.4-a
93 else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
94   asm-arch := armv8.3-a
95 else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
96   asm-arch := armv8.2-a
97 endif
98
99 ifdef asm-arch
100 KBUILD_CFLAGS   += -Wa,-march=$(asm-arch) \
101                    -DARM64_ASM_ARCH='"$(asm-arch)"'
102 endif
103
104 ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
105 KBUILD_CFLAGS   += -ffixed-x18
106 endif
107
108 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
109 KBUILD_CPPFLAGS += -mbig-endian
110 CHECKFLAGS      += -D__AARCH64EB__
111 # Prefer the baremetal ELF build target, but not all toolchains include
112 # it so fall back to the standard linux version if needed.
113 KBUILD_LDFLAGS  += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
114 UTS_MACHINE     := aarch64_be
115 else
116 KBUILD_CPPFLAGS += -mlittle-endian
117 CHECKFLAGS      += -D__AARCH64EL__
118 # Same as above, prefer ELF but fall back to linux target if needed.
119 KBUILD_LDFLAGS  += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
120 UTS_MACHINE     := aarch64
121 endif
122
123 ifeq ($(CONFIG_LD_IS_LLD), y)
124 KBUILD_LDFLAGS  += -z norelro
125 endif
126
127 CHECKFLAGS      += -D__aarch64__
128
129 ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y)
130   KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
131   CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
132 else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
133   KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
134   CC_FLAGS_FTRACE := -fpatchable-function-entry=2
135 endif
136
137 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
138 KASAN_SHADOW_SCALE_SHIFT := 4
139 else ifeq ($(CONFIG_KASAN_GENERIC), y)
140 KASAN_SHADOW_SCALE_SHIFT := 3
141 endif
142
143 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
144 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
145 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
146
147 libs-y          := arch/arm64/lib/ $(libs-y)
148 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
149
150 # Default target when executing plain make
151 boot            := arch/arm64/boot
152
153 ifeq ($(CONFIG_EFI_ZBOOT),)
154 KBUILD_IMAGE    := $(boot)/Image.gz
155 else
156 KBUILD_IMAGE    := $(boot)/vmlinuz.efi
157 endif
158
159 all:    $(notdir $(KBUILD_IMAGE))
160
161
162 Image vmlinuz.efi: vmlinux
163         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
164
165 Image.%: Image
166         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
167
168 install: KBUILD_IMAGE := $(boot)/Image
169 install zinstall:
170         $(call cmd,install)
171
172 PHONY += vdso_install
173 vdso_install:
174         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
175         $(if $(CONFIG_COMPAT_VDSO), \
176                 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
177
178 archprepare:
179         $(Q)$(MAKE) $(build)=arch/arm64/tools kapi
180 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
181   ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
182         @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
183   endif
184 endif
185 ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
186   ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
187         @echo "warning: LSE atomics not supported by binutils" >&2
188   endif
189 endif
190
191 ifeq ($(KBUILD_EXTMOD),)
192 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
193 # In order to do that, we should use the archprepare target, but we can't since
194 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
195 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
196 # Therefore we need to generate the header after prepare0 has been made, hence
197 # this hack.
198 prepare: vdso_prepare
199 vdso_prepare: prepare0
200         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
201         include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
202 ifdef CONFIG_COMPAT_VDSO
203         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
204         include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so
205 endif
206 endif
207
208 include $(srctree)/scripts/Makefile.defconf
209
210 PHONY += virtconfig
211 virtconfig:
212         $(call merge_into_defconfig_override,defconfig,virt)
213
214 define archhelp
215   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
216   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
217   echo  '  install       - Install uncompressed kernel'
218   echo  '  zinstall      - Install compressed kernel'
219   echo  '                  Install using (your) ~/bin/installkernel or'
220   echo  '                  (distribution) /sbin/installkernel or'
221   echo  '                  install to $$(INSTALL_PATH) and run lilo'
222 endef