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 aflags_dwarf := -Wa,-gdwarf-2
20 KBUILD_AFLAGS_DECOMPRESSOR := -m64 -D__ASSEMBLY__
21 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
22 KBUILD_CFLAGS_DECOMPRESSOR := -m64 -O2
23 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
24 KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float
25 KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
26 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-option,-ffreestanding)
27 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
28 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
29 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
31 ifdef CONFIG_CC_IS_GCC
32 ifeq ($(call cc-ifversion, -ge, 1200, y), y)
33 ifeq ($(call cc-ifversion, -lt, 1300, y), y)
34 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
35 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds)
42 CHECKFLAGS += -D__s390__ -D__s390x__
46 mflags-$(CONFIG_MARCH_Z900) := -march=z900
47 mflags-$(CONFIG_MARCH_Z990) := -march=z990
48 mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
49 mflags-$(CONFIG_MARCH_Z10) := -march=z10
50 mflags-$(CONFIG_MARCH_Z196) := -march=z196
51 mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12
52 mflags-$(CONFIG_MARCH_Z13) := -march=z13
53 mflags-$(CONFIG_MARCH_Z14) := -march=z14
55 export CC_FLAGS_MARCH := $(mflags-y)
57 aflags-y += $(mflags-y)
58 cflags-y += $(mflags-y)
60 cflags-$(CONFIG_MARCH_Z900_TUNE) += -mtune=z900
61 cflags-$(CONFIG_MARCH_Z990_TUNE) += -mtune=z990
62 cflags-$(CONFIG_MARCH_Z9_109_TUNE) += -mtune=z9-109
63 cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10
64 cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196
65 cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12
66 cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13
67 cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14
69 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
72 # Prevent tail-call optimizations, to get clearer backtraces:
74 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
76 ifeq ($(call cc-option-yn,-mpacked-stack -mbackchain -msoft-float),y)
77 cflags-$(CONFIG_PACK_STACK) += -mpacked-stack -D__PACK_STACK
78 aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
81 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
82 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
84 ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)
85 cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
86 ifneq ($(call cc-option-yn,-mstack-size=8192),y)
87 cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
91 ifdef CONFIG_WARN_DYNAMIC_STACK
92 ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
93 KBUILD_CFLAGS += -mwarn-dynamicstack
94 KBUILD_CFLAGS_DECOMPRESSOR += -mwarn-dynamicstack
99 ifeq ($(call cc-option-yn,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),y)
100 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
101 CC_FLAGS_EXPOLINE += -mfunction-return=thunk
102 CC_FLAGS_EXPOLINE += -mindirect-branch-table
103 export CC_FLAGS_EXPOLINE
104 cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
105 aflags-y += -DCC_USING_EXPOLINE
109 ifdef CONFIG_FUNCTION_TRACER
110 ifeq ($(call cc-option-yn,-mfentry -mnop-mcount),n)
111 # make use of hotpatch feature if the compiler supports it
112 cc_hotpatch := -mhotpatch=0,3
113 ifeq ($(call cc-option-yn,$(cc_hotpatch)),y)
114 CC_FLAGS_FTRACE := $(cc_hotpatch)
115 KBUILD_AFLAGS += -DCC_USING_HOTPATCH
116 KBUILD_CFLAGS += -DCC_USING_HOTPATCH
121 # Test CFI features of binutils
122 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
124 KBUILD_CFLAGS += -mbackchain -msoft-float $(cflags-y)
125 KBUILD_CFLAGS += -pipe -fno-strength-reduce -Wno-sign-compare
126 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi)
127 KBUILD_AFLAGS += $(aflags-y) $(cfi)
128 export KBUILD_AFLAGS_DECOMPRESSOR
129 export KBUILD_CFLAGS_DECOMPRESSOR
131 OBJCOPYFLAGS := -O binary
133 head-y := arch/s390/kernel/head64.o
135 # See arch/s390/Kbuild for content of core part of the kernel
138 libs-y += arch/s390/lib/
139 drivers-y += drivers/s390/
141 # must be linked after kernel
142 drivers-$(CONFIG_OPROFILE) += arch/s390/oprofile/
144 boot := arch/s390/boot
145 syscalls := arch/s390/kernel/syscalls
146 tools := arch/s390/tools
150 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
151 KBUILD_IMAGE := $(boot)/bzImage
154 $(Q)$(MAKE) $(build)=$(boot) $@
157 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
160 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
163 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
164 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
167 $(Q)$(MAKE) $(clean)=$(boot)
168 $(Q)$(MAKE) $(clean)=$(tools)
171 $(Q)$(MAKE) $(build)=$(syscalls) uapi
174 $(Q)$(MAKE) $(build)=$(syscalls) kapi
175 $(Q)$(MAKE) $(build)=$(tools) kapi
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)'