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.
8 # Copyright (C) 1994 by Linus Torvalds
12 KBUILD_LDFLAGS := -m elf64_s390
13 KBUILD_AFLAGS_MODULE += -fPIC
14 KBUILD_CFLAGS_MODULE += -fPIC
17 ifeq ($(CONFIG_RELOCATABLE),y)
18 KBUILD_CFLAGS += -fPIE
19 LDFLAGS_vmlinux := -pie
21 aflags_dwarf := -Wa,-gdwarf-2
22 KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
23 ifndef CONFIG_AS_IS_LLVM
24 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
26 KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
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), $(call cc-option, -gdwarf-4,))
36 ifdef CONFIG_CC_IS_GCC
37 ifeq ($(call cc-ifversion, -ge, 1200, y), y)
38 ifeq ($(call cc-ifversion, -lt, 1300, y), y)
39 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
40 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds)
46 STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384)
47 CHECKFLAGS += -D__s390__ -D__s390x__
51 mflags-$(CONFIG_MARCH_Z10) := -march=z10
52 mflags-$(CONFIG_MARCH_Z196) := -march=z196
53 mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12
54 mflags-$(CONFIG_MARCH_Z13) := -march=z13
55 mflags-$(CONFIG_MARCH_Z14) := -march=z14
56 mflags-$(CONFIG_MARCH_Z15) := -march=z15
57 mflags-$(CONFIG_MARCH_Z16) := -march=z16
59 export CC_FLAGS_MARCH := $(mflags-y)
61 aflags-y += $(mflags-y)
62 cflags-y += $(mflags-y)
64 cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10
65 cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196
66 cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12
67 cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13
68 cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14
69 cflags-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15
70 cflags-$(CONFIG_MARCH_Z16_TUNE) += -mtune=z16
72 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
75 # Prevent tail-call optimizations, to get clearer backtraces:
77 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
79 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
80 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
82 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
83 CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
84 ifeq ($(call cc-option,-mstack-size=8192),)
85 CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
87 export CC_FLAGS_CHECK_STACK
88 cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
92 ifdef CONFIG_EXPOLINE_EXTERN
93 KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline.o
94 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
95 CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
97 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
98 CC_FLAGS_EXPOLINE += -mfunction-return=thunk
100 CC_FLAGS_EXPOLINE += -mindirect-branch-table
101 export CC_FLAGS_EXPOLINE
102 cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
103 aflags-y += -DCC_USING_EXPOLINE
106 ifdef CONFIG_FUNCTION_TRACER
107 ifeq ($(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 += -mpacked-stack -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) $(build)=$(syscalls) uapi
161 $(Q)$(MAKE) $(build)=$(syscalls) kapi
162 $(Q)$(MAKE) $(build)=$(tools) kapi
163 ifeq ($(KBUILD_EXTMOD),)
164 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
165 # In order to do that, we should use the archprepare target, but we can't since
166 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
167 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
168 # Therefore we need to generate the header after prepare0 has been made, hence
170 prepare: vdso_prepare
171 vdso_prepare: prepare0
172 $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
173 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
174 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
177 # Don't use tabs in echo arguments
179 echo '* bzImage - Kernel image for IPL ($(boot)/bzImage)'
180 echo ' install - Install kernel using'
181 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
182 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
183 echo ' install to $$(INSTALL_PATH)'