1 # SPDX-License-Identifier: GPL-2.0
5 # This file is included by the global makefile so that you can add your own
6 # architecture-specific flags and dependencies. Remember to do have actions
7 # for "archclean" and "archdep" for cleaning up and making dependencies for
10 # Copyright (C) 1994 by Linus Torvalds
14 KBUILD_LDFLAGS := -m elf64_s390
15 KBUILD_AFLAGS_MODULE += -fPIC
16 KBUILD_CFLAGS_MODULE += -fPIC
19 ifeq ($(CONFIG_RELOCATABLE),y)
20 KBUILD_CFLAGS += -fPIE
21 LDFLAGS_vmlinux := -pie
23 aflags_dwarf := -Wa,-gdwarf-2
24 KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
25 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
26 KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2
27 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
28 KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
29 KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
30 KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
31 KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
32 KBUILD_CFLAGS_DECOMPRESSOR += -fPIE
33 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
34 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
35 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
37 ifdef CONFIG_CC_IS_GCC
38 ifeq ($(call cc-ifversion, -ge, 1200, y), y)
39 ifeq ($(call cc-ifversion, -lt, 1300, y), y)
40 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
41 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds)
47 STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384)
48 CHECKFLAGS += -D__s390__ -D__s390x__
52 mflags-$(CONFIG_MARCH_Z900) := -march=z900
53 mflags-$(CONFIG_MARCH_Z990) := -march=z990
54 mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
55 mflags-$(CONFIG_MARCH_Z10) := -march=z10
56 mflags-$(CONFIG_MARCH_Z196) := -march=z196
57 mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12
58 mflags-$(CONFIG_MARCH_Z13) := -march=z13
59 mflags-$(CONFIG_MARCH_Z14) := -march=z14
60 mflags-$(CONFIG_MARCH_Z15) := -march=z15
62 export CC_FLAGS_MARCH := $(mflags-y)
64 aflags-y += $(mflags-y)
65 cflags-y += $(mflags-y)
67 cflags-$(CONFIG_MARCH_Z900_TUNE) += -mtune=z900
68 cflags-$(CONFIG_MARCH_Z990_TUNE) += -mtune=z990
69 cflags-$(CONFIG_MARCH_Z9_109_TUNE) += -mtune=z9-109
70 cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10
71 cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196
72 cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12
73 cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13
74 cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14
75 cflags-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15
77 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
80 # Prevent tail-call optimizations, to get clearer backtraces:
82 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
84 ifneq ($(call cc-option,-mpacked-stack -mbackchain -msoft-float),)
85 cflags-$(CONFIG_PACK_STACK) += -mpacked-stack -D__PACK_STACK
86 aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
89 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
90 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
92 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
93 CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
94 ifeq ($(call cc-option,-mstack-size=8192),)
95 CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
97 export CC_FLAGS_CHECK_STACK
98 cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
101 ifdef CONFIG_EXPOLINE
102 ifneq ($(call cc-option,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),)
103 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
104 CC_FLAGS_EXPOLINE += -mfunction-return=thunk
105 CC_FLAGS_EXPOLINE += -mindirect-branch-table
106 export CC_FLAGS_EXPOLINE
107 cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
108 aflags-y += -DCC_USING_EXPOLINE
112 ifdef CONFIG_FUNCTION_TRACER
113 ifeq ($(call cc-option,-mfentry -mnop-mcount),)
114 # make use of hotpatch feature if the compiler supports it
115 cc_hotpatch := -mhotpatch=0,3
116 ifneq ($(call cc-option,$(cc_hotpatch)),)
117 CC_FLAGS_FTRACE := $(cc_hotpatch)
118 KBUILD_AFLAGS += -DCC_USING_HOTPATCH
119 KBUILD_CFLAGS += -DCC_USING_HOTPATCH
124 # Test CFI features of binutils
125 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
127 KBUILD_CFLAGS += -mbackchain -msoft-float $(cflags-y)
128 KBUILD_CFLAGS += -pipe -Wno-sign-compare
129 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi)
130 KBUILD_AFLAGS += $(aflags-y) $(cfi)
131 export KBUILD_AFLAGS_DECOMPRESSOR
132 export KBUILD_CFLAGS_DECOMPRESSOR
134 OBJCOPYFLAGS := -O binary
136 head-y := arch/s390/kernel/head64.o
138 libs-y += arch/s390/lib/
139 drivers-y += drivers/s390/
141 boot := arch/s390/boot
142 syscalls := arch/s390/kernel/syscalls
143 tools := arch/s390/tools
147 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
148 KBUILD_IMAGE := $(boot)/bzImage
151 sh -x $(srctree)/$(boot)/install.sh $(KERNELRELEASE) $(KBUILD_IMAGE) \
152 System.map "$(INSTALL_PATH)"
155 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
158 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
161 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
164 $(Q)$(MAKE) $(clean)=$(boot)
165 $(Q)$(MAKE) $(clean)=$(tools)
168 $(Q)$(MAKE) $(build)=$(syscalls) uapi
171 $(Q)$(MAKE) $(build)=$(syscalls) kapi
172 $(Q)$(MAKE) $(build)=$(tools) kapi
173 ifeq ($(KBUILD_EXTMOD),)
174 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
175 # In order to do that, we should use the archprepare target, but we can't since
176 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
177 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
178 # Therefore we need to generate the header after prepare0 has been made, hence
180 prepare: vdso_prepare
181 vdso_prepare: prepare0
182 $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
183 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
184 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
187 # Don't use tabs in echo arguments
189 echo '* bzImage - Kernel image for IPL ($(boot)/bzImage)'
190 echo ' install - Install kernel using'
191 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
192 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
193 echo ' install to $$(INSTALL_PATH)'