1# SPDX-License-Identifier: GPL-2.0
2#
3# s390/Makefile
4#
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
8# this architecture
9#
10# Copyright (C) 1994 by Linus Torvalds
11#
12
13LD_BFD		:= elf64-s390
14KBUILD_LDFLAGS	:= -m elf64_s390
15KBUILD_AFLAGS_MODULE += -fPIC
16KBUILD_CFLAGS_MODULE += -fPIC
17KBUILD_AFLAGS	+= -m64
18KBUILD_CFLAGS	+= -m64
19ifeq ($(CONFIG_RELOCATABLE),y)
20KBUILD_CFLAGS	+= -fPIE
21LDFLAGS_vmlinux	:= -pie
22endif
23aflags_dwarf	:= -Wa,-gdwarf-2
24KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
25KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
26KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2
27KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
28KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float
29KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
30KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
31KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
32KBUILD_CFLAGS_DECOMPRESSOR += -fPIE
33KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
34KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
35KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
36
37ifdef CONFIG_CC_IS_GCC
38	ifeq ($(call cc-ifversion, -ge, 1200, y), y)
39		ifeq ($(call cc-ifversion, -lt, 1300, y), y)
40			KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
41			KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds)
42		endif
43	endif
44endif
45
46UTS_MACHINE	:= s390x
47STACK_SIZE	:= $(if $(CONFIG_KASAN),65536,16384)
48CHECKFLAGS	+= -D__s390__ -D__s390x__
49
50export LD_BFD
51
52mflags-$(CONFIG_MARCH_Z900)   := -march=z900
53mflags-$(CONFIG_MARCH_Z990)   := -march=z990
54mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
55mflags-$(CONFIG_MARCH_Z10)    := -march=z10
56mflags-$(CONFIG_MARCH_Z196)   := -march=z196
57mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
58mflags-$(CONFIG_MARCH_Z13)    := -march=z13
59mflags-$(CONFIG_MARCH_Z14)    := -march=z14
60mflags-$(CONFIG_MARCH_Z15)    := -march=z15
61
62export CC_FLAGS_MARCH := $(mflags-y)
63
64aflags-y += $(mflags-y)
65cflags-y += $(mflags-y)
66
67cflags-$(CONFIG_MARCH_Z900_TUNE)	+= -mtune=z900
68cflags-$(CONFIG_MARCH_Z990_TUNE)	+= -mtune=z990
69cflags-$(CONFIG_MARCH_Z9_109_TUNE)	+= -mtune=z9-109
70cflags-$(CONFIG_MARCH_Z10_TUNE)		+= -mtune=z10
71cflags-$(CONFIG_MARCH_Z196_TUNE)	+= -mtune=z196
72cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12
73cflags-$(CONFIG_MARCH_Z13_TUNE)		+= -mtune=z13
74cflags-$(CONFIG_MARCH_Z14_TUNE)		+= -mtune=z14
75cflags-$(CONFIG_MARCH_Z15_TUNE)		+= -mtune=z15
76
77cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
78
79#
80# Prevent tail-call optimizations, to get clearer backtraces:
81#
82cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
83
84ifeq ($(call cc-option-yn,-mpacked-stack -mbackchain -msoft-float),y)
85cflags-$(CONFIG_PACK_STACK)  += -mpacked-stack -D__PACK_STACK
86aflags-$(CONFIG_PACK_STACK)  += -D__PACK_STACK
87endif
88
89KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
90KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
91
92ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)
93cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
94ifneq ($(call cc-option-yn,-mstack-size=8192),y)
95cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
96endif
97endif
98
99ifdef CONFIG_WARN_DYNAMIC_STACK
100  ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
101    KBUILD_CFLAGS += -mwarn-dynamicstack
102    KBUILD_CFLAGS_DECOMPRESSOR += -mwarn-dynamicstack
103  endif
104endif
105
106ifdef CONFIG_EXPOLINE
107  ifeq ($(call cc-option-yn,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),y)
108    CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
109    CC_FLAGS_EXPOLINE += -mfunction-return=thunk
110    CC_FLAGS_EXPOLINE += -mindirect-branch-table
111    export CC_FLAGS_EXPOLINE
112    cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
113    aflags-y += -DCC_USING_EXPOLINE
114  endif
115endif
116
117ifdef CONFIG_FUNCTION_TRACER
118  ifeq ($(call cc-option-yn,-mfentry -mnop-mcount),n)
119    # make use of hotpatch feature if the compiler supports it
120    cc_hotpatch	:= -mhotpatch=0,3
121    ifeq ($(call cc-option-yn,$(cc_hotpatch)),y)
122      CC_FLAGS_FTRACE := $(cc_hotpatch)
123      KBUILD_AFLAGS	+= -DCC_USING_HOTPATCH
124      KBUILD_CFLAGS	+= -DCC_USING_HOTPATCH
125    endif
126  endif
127endif
128
129# Test CFI features of binutils
130cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
131
132KBUILD_CFLAGS	+= -mbackchain -msoft-float $(cflags-y)
133KBUILD_CFLAGS	+= -pipe -Wno-sign-compare
134KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables $(cfi)
135KBUILD_AFLAGS	+= $(aflags-y) $(cfi)
136export KBUILD_AFLAGS_DECOMPRESSOR
137export KBUILD_CFLAGS_DECOMPRESSOR
138
139OBJCOPYFLAGS	:= -O binary
140
141head-y		:= arch/s390/kernel/head64.o
142
143# See arch/s390/Kbuild for content of core part of the kernel
144core-y		+= arch/s390/
145
146libs-y		+= arch/s390/lib/
147drivers-y	+= drivers/s390/
148
149# must be linked after kernel
150drivers-$(CONFIG_OPROFILE)	+= arch/s390/oprofile/
151
152boot		:= arch/s390/boot
153syscalls	:= arch/s390/kernel/syscalls
154tools		:= arch/s390/tools
155
156all: bzImage
157
158#KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
159KBUILD_IMAGE	:= $(boot)/bzImage
160
161install:
162	$(Q)$(MAKE) $(build)=$(boot) $@
163
164bzImage: vmlinux
165	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
166
167zfcpdump:
168	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
169
170vdso_install:
171	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
172
173archclean:
174	$(Q)$(MAKE) $(clean)=$(boot)
175	$(Q)$(MAKE) $(clean)=$(tools)
176
177archheaders:
178	$(Q)$(MAKE) $(build)=$(syscalls) uapi
179
180archprepare:
181	$(Q)$(MAKE) $(build)=$(syscalls) kapi
182	$(Q)$(MAKE) $(build)=$(tools) kapi
183
184# Don't use tabs in echo arguments
185define archhelp
186  echo	'* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
187  echo	'  install         - Install kernel using'
188  echo	'                    (your) ~/bin/$(INSTALLKERNEL) or'
189  echo	'                    (distribution) /sbin/$(INSTALLKERNEL) or'
190  echo	'                    install to $$(INSTALL_PATH)'
191endef
192