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 += $(call cc-disable-warning, address-of-packed-member)
33 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
34 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
36 STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384)
37 CHECKFLAGS += -D__s390__ -D__s390x__
41 mflags-$(CONFIG_MARCH_Z900) := -march=z900
42 mflags-$(CONFIG_MARCH_Z990) := -march=z990
43 mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
44 mflags-$(CONFIG_MARCH_Z10) := -march=z10
45 mflags-$(CONFIG_MARCH_Z196) := -march=z196
46 mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12
47 mflags-$(CONFIG_MARCH_Z13) := -march=z13
48 mflags-$(CONFIG_MARCH_Z14) := -march=z14
49 mflags-$(CONFIG_MARCH_Z15) := -march=z15
51 export CC_FLAGS_MARCH := $(mflags-y)
53 aflags-y += $(mflags-y)
54 cflags-y += $(mflags-y)
56 cflags-$(CONFIG_MARCH_Z900_TUNE) += -mtune=z900
57 cflags-$(CONFIG_MARCH_Z990_TUNE) += -mtune=z990
58 cflags-$(CONFIG_MARCH_Z9_109_TUNE) += -mtune=z9-109
59 cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10
60 cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196
61 cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12
62 cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13
63 cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14
64 cflags-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15
66 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
69 # Prevent tail-call optimizations, to get clearer backtraces:
71 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
73 ifneq ($(call cc-option,-mpacked-stack -mbackchain -msoft-float),)
74 cflags-$(CONFIG_PACK_STACK) += -mpacked-stack -D__PACK_STACK
75 aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
78 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
79 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
81 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
82 cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
83 ifeq ($(call cc-option,-mstack-size=8192),)
84 cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
88 ifdef CONFIG_WARN_DYNAMIC_STACK
89 ifneq ($(call cc-option,-mwarn-dynamicstack),)
90 KBUILD_CFLAGS += -mwarn-dynamicstack
91 KBUILD_CFLAGS_DECOMPRESSOR += -mwarn-dynamicstack
96 ifneq ($(call cc-option,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),)
97 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
98 CC_FLAGS_EXPOLINE += -mfunction-return=thunk
99 CC_FLAGS_EXPOLINE += -mindirect-branch-table
100 export CC_FLAGS_EXPOLINE
101 cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
102 aflags-y += -DCC_USING_EXPOLINE
106 ifdef CONFIG_FUNCTION_TRACER
107 ifeq ($(call cc-option,-mfentry -mnop-mcount),)
108 # make use of hotpatch feature if the compiler supports it
109 cc_hotpatch := -mhotpatch=0,3
110 ifneq ($(call cc-option,$(cc_hotpatch)),)
111 CC_FLAGS_FTRACE := $(cc_hotpatch)
112 KBUILD_AFLAGS += -DCC_USING_HOTPATCH
113 KBUILD_CFLAGS += -DCC_USING_HOTPATCH
118 # Test CFI features of binutils
119 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
121 KBUILD_CFLAGS += -mbackchain -msoft-float $(cflags-y)
122 KBUILD_CFLAGS += -pipe -Wno-sign-compare
123 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi)
124 KBUILD_AFLAGS += $(aflags-y) $(cfi)
125 export KBUILD_AFLAGS_DECOMPRESSOR
126 export KBUILD_CFLAGS_DECOMPRESSOR
128 OBJCOPYFLAGS := -O binary
130 head-y := arch/s390/kernel/head64.o
132 libs-y += arch/s390/lib/
133 drivers-y += drivers/s390/
135 boot := arch/s390/boot
136 syscalls := arch/s390/kernel/syscalls
137 tools := arch/s390/tools
141 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
142 KBUILD_IMAGE := $(boot)/bzImage
145 sh -x $(srctree)/$(boot)/install.sh $(KERNELRELEASE) $(KBUILD_IMAGE) \
146 System.map "$(INSTALL_PATH)"
149 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
152 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
155 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
158 $(Q)$(MAKE) $(clean)=$(boot)
159 $(Q)$(MAKE) $(clean)=$(tools)
162 $(Q)$(MAKE) $(build)=$(syscalls) uapi
165 $(Q)$(MAKE) $(build)=$(syscalls) kapi
166 $(Q)$(MAKE) $(build)=$(tools) kapi
167 ifeq ($(KBUILD_EXTMOD),)
168 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
169 # In order to do that, we should use the archprepare target, but we can't since
170 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
171 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
172 # Therefore we need to generate the header after prepare0 has been made, hence
174 prepare: vdso_prepare
175 vdso_prepare: prepare0
176 $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
177 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
178 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
181 # Don't use tabs in echo arguments
183 echo '* bzImage - Kernel image for IPL ($(boot)/bzImage)'
184 echo ' install - Install kernel using'
185 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
186 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
187 echo ' install to $$(INSTALL_PATH)'