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
29 KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
30 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-option,-ffreestanding)
31 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
32 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
33 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
35 ifdef CONFIG_CC_IS_GCC
36 ifeq ($(call cc-ifversion, -ge, 1200, y), y)
37 ifeq ($(call cc-ifversion, -lt, 1300, y), y)
38 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
39 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds)
45 STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384)
46 CHECKFLAGS += -D__s390__ -D__s390x__
50 mflags-$(CONFIG_MARCH_Z900) := -march=z900
51 mflags-$(CONFIG_MARCH_Z990) := -march=z990
52 mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
53 mflags-$(CONFIG_MARCH_Z10) := -march=z10
54 mflags-$(CONFIG_MARCH_Z196) := -march=z196
55 mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12
56 mflags-$(CONFIG_MARCH_Z13) := -march=z13
57 mflags-$(CONFIG_MARCH_Z14) := -march=z14
58 mflags-$(CONFIG_MARCH_Z15) := -march=z15
60 export CC_FLAGS_MARCH := $(mflags-y)
62 aflags-y += $(mflags-y)
63 cflags-y += $(mflags-y)
65 cflags-$(CONFIG_MARCH_Z900_TUNE) += -mtune=z900
66 cflags-$(CONFIG_MARCH_Z990_TUNE) += -mtune=z990
67 cflags-$(CONFIG_MARCH_Z9_109_TUNE) += -mtune=z9-109
68 cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10
69 cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196
70 cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12
71 cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13
72 cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14
73 cflags-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15
75 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
78 # Prevent tail-call optimizations, to get clearer backtraces:
80 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
82 ifeq ($(call cc-option-yn,-mpacked-stack -mbackchain -msoft-float),y)
83 cflags-$(CONFIG_PACK_STACK) += -mpacked-stack -D__PACK_STACK
84 aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
87 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
88 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
90 ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)
91 cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
92 ifneq ($(call cc-option-yn,-mstack-size=8192),y)
93 cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
97 ifdef CONFIG_WARN_DYNAMIC_STACK
98 ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
99 KBUILD_CFLAGS += -mwarn-dynamicstack
100 KBUILD_CFLAGS_DECOMPRESSOR += -mwarn-dynamicstack
104 ifdef CONFIG_EXPOLINE
105 ifeq ($(call cc-option-yn,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),y)
106 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
107 CC_FLAGS_EXPOLINE += -mfunction-return=thunk
108 CC_FLAGS_EXPOLINE += -mindirect-branch-table
109 export CC_FLAGS_EXPOLINE
110 cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
111 aflags-y += -DCC_USING_EXPOLINE
115 ifdef CONFIG_FUNCTION_TRACER
116 ifeq ($(call cc-option-yn,-mfentry -mnop-mcount),n)
117 # make use of hotpatch feature if the compiler supports it
118 cc_hotpatch := -mhotpatch=0,3
119 ifeq ($(call cc-option-yn,$(cc_hotpatch)),y)
120 CC_FLAGS_FTRACE := $(cc_hotpatch)
121 KBUILD_AFLAGS += -DCC_USING_HOTPATCH
122 KBUILD_CFLAGS += -DCC_USING_HOTPATCH
127 # Test CFI features of binutils
128 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
130 KBUILD_CFLAGS += -mbackchain -msoft-float $(cflags-y)
131 KBUILD_CFLAGS += -pipe -Wno-sign-compare
132 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi)
133 KBUILD_AFLAGS += $(aflags-y) $(cfi)
134 export KBUILD_AFLAGS_DECOMPRESSOR
135 export KBUILD_CFLAGS_DECOMPRESSOR
137 OBJCOPYFLAGS := -O binary
139 head-y := arch/s390/kernel/head64.o
141 # See arch/s390/Kbuild for content of core part of the kernel
144 libs-y += arch/s390/lib/
145 drivers-y += drivers/s390/
147 # must be linked after kernel
148 drivers-$(CONFIG_OPROFILE) += arch/s390/oprofile/
150 boot := arch/s390/boot
151 syscalls := arch/s390/kernel/syscalls
152 tools := arch/s390/tools
156 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
157 KBUILD_IMAGE := $(boot)/bzImage
160 $(Q)$(MAKE) $(build)=$(boot) $@
163 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
166 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
169 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
170 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
173 $(Q)$(MAKE) $(clean)=$(boot)
174 $(Q)$(MAKE) $(clean)=$(tools)
177 $(Q)$(MAKE) $(build)=$(syscalls) uapi
180 $(Q)$(MAKE) $(build)=$(syscalls) kapi
181 $(Q)$(MAKE) $(build)=$(tools) kapi
183 # Don't use tabs in echo arguments
185 echo '* bzImage - Kernel image for IPL ($(boot)/bzImage)'
186 echo ' install - Install kernel using'
187 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
188 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
189 echo ' install to $$(INSTALL_PATH)'