xref: /openbmc/linux/arch/arm64/Makefile (revision 37b9b9a5) 
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
13LDFLAGS_vmlinux	:=--no-undefined -X
14CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
15GZFLAGS		:=-9
16
17ifeq ($(CONFIG_RELOCATABLE), y)
18# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
19# for relative relocs, since this leads to better Image compression
20# with the relocation offsets always being zero.
21LDFLAGS_vmlinux		+= -shared -Bsymbolic -z notext -z norelro \
22			$(call ld-option, --no-apply-dynamic-relocs)
23endif
24
25ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
26  ifeq ($(call ld-option, --fix-cortex-a53-843419),)
27$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
28  else
29LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
30  endif
31endif
32
33# Check for binutils support for specific extensions
34lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
35
36ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
37  ifeq ($(lseinstr),)
38$(warning LSE atomics not supported by binutils)
39  endif
40endif
41
42cc_has_k_constraint := $(call try-run,echo				\
43	'int main(void) {						\
44		asm volatile("and w0, w0, %w0" :: "K" (4294967295));	\
45		return 0;						\
46	}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
47
48ifeq ($(CONFIG_ARM64), y)
49brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
50
51  ifneq ($(brokengasinst),)
52$(warning Detected assembler with broken .inst; disassembly will be unreliable)
53  endif
54endif
55
56KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst)	\
57		   $(compat_vdso) $(cc_has_k_constraint)
58KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
59KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
60KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst) $(compat_vdso)
61
62KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
63KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
64
65ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
66prepare: stack_protector_prepare
67stack_protector_prepare: prepare0
68	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
69				-mstack-protector-guard-reg=sp_el0	  \
70				-mstack-protector-guard-offset=$(shell	  \
71			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
72					include/generated/asm-offsets.h))
73endif
74
75ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
76KBUILD_CPPFLAGS	+= -mbig-endian
77CHECKFLAGS	+= -D__AARCH64EB__
78AS		+= -EB
79# Prefer the baremetal ELF build target, but not all toolchains include
80# it so fall back to the standard linux version if needed.
81KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
82UTS_MACHINE	:= aarch64_be
83else
84KBUILD_CPPFLAGS	+= -mlittle-endian
85CHECKFLAGS	+= -D__AARCH64EL__
86AS		+= -EL
87# Same as above, prefer ELF but fall back to linux target if needed.
88KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
89UTS_MACHINE	:= aarch64
90endif
91
92CHECKFLAGS	+= -D__aarch64__
93
94ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
95KBUILD_LDS_MODULE	+= $(srctree)/arch/arm64/kernel/module.lds
96endif
97
98ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y)
99  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
100  CC_FLAGS_FTRACE := -fpatchable-function-entry=2
101endif
102
103# Default value
104head-y		:= arch/arm64/kernel/head.o
105
106# The byte offset of the kernel image in RAM from the start of RAM.
107ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
108TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
109		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
110		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
111else
112TEXT_OFFSET := 0x00080000
113endif
114
115ifeq ($(CONFIG_KASAN_SW_TAGS), y)
116KASAN_SHADOW_SCALE_SHIFT := 4
117else
118KASAN_SHADOW_SCALE_SHIFT := 3
119endif
120
121KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
122KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
123KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
124
125export	TEXT_OFFSET GZFLAGS
126
127core-y		+= arch/arm64/
128libs-y		:= arch/arm64/lib/ $(libs-y)
129core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
130
131# Default target when executing plain make
132boot		:= arch/arm64/boot
133KBUILD_IMAGE	:= $(boot)/Image.gz
134
135all:	Image.gz
136
137
138Image: vmlinux
139	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
140
141Image.%: Image
142	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
143
144zinstall install:
145	$(Q)$(MAKE) $(build)=$(boot) $@
146
147PHONY += vdso_install
148vdso_install:
149	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
150
151# We use MRPROPER_FILES and CLEAN_FILES now
152archclean:
153	$(Q)$(MAKE) $(clean)=$(boot)
154
155ifeq ($(KBUILD_EXTMOD),)
156# We need to generate vdso-offsets.h before compiling certain files in kernel/.
157# In order to do that, we should use the archprepare target, but we can't since
158# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
159# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
160# Therefore we need to generate the header after prepare0 has been made, hence
161# this hack.
162prepare: vdso_prepare
163vdso_prepare: prepare0
164	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
165	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
166		$(build)=arch/arm64/kernel/vdso32  \
167		include/generated/vdso32-offsets.h)
168endif
169
170define archhelp
171  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
172  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
173  echo  '  install       - Install uncompressed kernel'
174  echo  '  zinstall      - Install compressed kernel'
175  echo  '                  Install using (your) ~/bin/installkernel or'
176  echo  '                  (distribution) /sbin/installkernel or'
177  echo  '                  install to $$(INSTALL_PATH) and run lilo'
178endef
179