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 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
24 KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
25 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
26 KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
27 KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
28 KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
29 KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
30 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
31 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
32 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
34 STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384)
35 CHECKFLAGS += -D__s390__ -D__s390x__
39 mflags-$(CONFIG_MARCH_Z900) := -march=z900
40 mflags-$(CONFIG_MARCH_Z990) := -march=z990
41 mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
42 mflags-$(CONFIG_MARCH_Z10) := -march=z10
43 mflags-$(CONFIG_MARCH_Z196) := -march=z196
44 mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12
45 mflags-$(CONFIG_MARCH_Z13) := -march=z13
46 mflags-$(CONFIG_MARCH_Z14) := -march=z14
47 mflags-$(CONFIG_MARCH_Z15) := -march=z15
49 export CC_FLAGS_MARCH := $(mflags-y)
51 aflags-y += $(mflags-y)
52 cflags-y += $(mflags-y)
54 cflags-$(CONFIG_MARCH_Z900_TUNE) += -mtune=z900
55 cflags-$(CONFIG_MARCH_Z990_TUNE) += -mtune=z990
56 cflags-$(CONFIG_MARCH_Z9_109_TUNE) += -mtune=z9-109
57 cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10
58 cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196
59 cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12
60 cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13
61 cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14
62 cflags-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15
64 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
67 # Prevent tail-call optimizations, to get clearer backtraces:
69 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
71 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
72 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
74 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
75 CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
76 ifeq ($(call cc-option,-mstack-size=8192),)
77 CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
79 export CC_FLAGS_CHECK_STACK
80 cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
84 ifneq ($(call cc-option,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),)
85 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
86 CC_FLAGS_EXPOLINE += -mfunction-return=thunk
87 CC_FLAGS_EXPOLINE += -mindirect-branch-table
88 export CC_FLAGS_EXPOLINE
89 cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
90 aflags-y += -DCC_USING_EXPOLINE
94 ifdef CONFIG_FUNCTION_TRACER
95 ifeq ($(call cc-option,-mfentry -mnop-mcount),)
96 # make use of hotpatch feature if the compiler supports it
97 cc_hotpatch := -mhotpatch=0,3
98 ifneq ($(call cc-option,$(cc_hotpatch)),)
99 CC_FLAGS_FTRACE := $(cc_hotpatch)
100 KBUILD_AFLAGS += -DCC_USING_HOTPATCH
101 KBUILD_CFLAGS += -DCC_USING_HOTPATCH
106 # Test CFI features of binutils
107 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
109 KBUILD_CFLAGS += -mpacked-stack -mbackchain -msoft-float $(cflags-y)
110 KBUILD_CFLAGS += -pipe -Wno-sign-compare
111 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi)
112 KBUILD_AFLAGS += $(aflags-y) $(cfi)
113 export KBUILD_AFLAGS_DECOMPRESSOR
114 export KBUILD_CFLAGS_DECOMPRESSOR
116 OBJCOPYFLAGS := -O binary
118 head-y := arch/s390/kernel/head64.o
120 libs-y += arch/s390/lib/
121 drivers-y += drivers/s390/
123 boot := arch/s390/boot
124 syscalls := arch/s390/kernel/syscalls
125 tools := arch/s390/tools
129 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
130 KBUILD_IMAGE := $(boot)/bzImage
133 sh -x $(srctree)/$(boot)/install.sh $(KERNELRELEASE) $(KBUILD_IMAGE) \
134 System.map "$(INSTALL_PATH)"
137 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
140 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
143 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
146 $(Q)$(MAKE) $(build)=$(syscalls) uapi
149 $(Q)$(MAKE) $(build)=$(syscalls) kapi
150 $(Q)$(MAKE) $(build)=$(tools) kapi
151 ifeq ($(KBUILD_EXTMOD),)
152 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
153 # In order to do that, we should use the archprepare target, but we can't since
154 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
155 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
156 # Therefore we need to generate the header after prepare0 has been made, hence
158 prepare: vdso_prepare
159 vdso_prepare: prepare0
160 $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
161 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
162 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
165 # Don't use tabs in echo arguments
167 echo '* bzImage - Kernel image for IPL ($(boot)/bzImage)'
168 echo ' install - Install kernel using'
169 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
170 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
171 echo ' install to $$(INSTALL_PATH)'