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.
7#
8# Copyright (C) 1994 by Linus Torvalds
9#
10
11LD_BFD		:= elf64-s390
12KBUILD_LDFLAGS	:= -m elf64_s390
13KBUILD_AFLAGS_MODULE += -fPIC
14KBUILD_CFLAGS_MODULE += -fPIC
15KBUILD_AFLAGS	+= -m64
16KBUILD_CFLAGS	+= -m64
17ifeq ($(CONFIG_RELOCATABLE),y)
18KBUILD_CFLAGS	+= -fPIE
19LDFLAGS_vmlinux	:= -pie
20endif
21aflags_dwarf	:= -Wa,-gdwarf-2
22KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
23ifndef CONFIG_AS_IS_LLVM
24KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
25endif
26KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
27KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
28KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
29KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
30KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
31KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
32KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
33KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
34KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
35
36ifdef CONFIG_CC_IS_GCC
37	ifeq ($(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)
41		endif
42	endif
43endif
44
45UTS_MACHINE	:= s390x
46STACK_SIZE	:= $(if $(CONFIG_KASAN),65536,16384)
47CHECKFLAGS	+= -D__s390__ -D__s390x__
48
49export LD_BFD
50
51mflags-$(CONFIG_MARCH_Z10)    := -march=z10
52mflags-$(CONFIG_MARCH_Z196)   := -march=z196
53mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
54mflags-$(CONFIG_MARCH_Z13)    := -march=z13
55mflags-$(CONFIG_MARCH_Z14)    := -march=z14
56mflags-$(CONFIG_MARCH_Z15)    := -march=z15
57mflags-$(CONFIG_MARCH_Z16)    := -march=z16
58
59export CC_FLAGS_MARCH := $(mflags-y)
60
61aflags-y += $(mflags-y)
62cflags-y += $(mflags-y)
63
64cflags-$(CONFIG_MARCH_Z10_TUNE)		+= -mtune=z10
65cflags-$(CONFIG_MARCH_Z196_TUNE)	+= -mtune=z196
66cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12
67cflags-$(CONFIG_MARCH_Z13_TUNE)		+= -mtune=z13
68cflags-$(CONFIG_MARCH_Z14_TUNE)		+= -mtune=z14
69cflags-$(CONFIG_MARCH_Z15_TUNE)		+= -mtune=z15
70cflags-$(CONFIG_MARCH_Z16_TUNE)		+= -mtune=z16
71
72cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
73
74#
75# Prevent tail-call optimizations, to get clearer backtraces:
76#
77cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
78
79KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
80KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
81
82ifneq ($(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=$(CONFIG_STACK_GUARD)
86  endif
87  export CC_FLAGS_CHECK_STACK
88  cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
89endif
90
91ifdef CONFIG_EXPOLINE
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
96  else
97    CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
98    CC_FLAGS_EXPOLINE += -mfunction-return=thunk
99  endif
100  CC_FLAGS_EXPOLINE += -mindirect-branch-table
101  export CC_FLAGS_EXPOLINE
102  cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
103  aflags-y += -DCC_USING_EXPOLINE
104endif
105
106ifdef CONFIG_FUNCTION_TRACER
107  ifeq ($(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
114    endif
115  endif
116endif
117
118# Test CFI features of binutils
119cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
120
121KBUILD_CFLAGS	+= -mpacked-stack -mbackchain -msoft-float $(cflags-y)
122KBUILD_CFLAGS	+= -pipe -Wno-sign-compare
123KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables $(cfi)
124KBUILD_AFLAGS	+= $(aflags-y) $(cfi)
125export KBUILD_AFLAGS_DECOMPRESSOR
126export KBUILD_CFLAGS_DECOMPRESSOR
127
128OBJCOPYFLAGS	:= -O binary
129
130head-y		:= arch/s390/kernel/head64.o
131
132libs-y		+= arch/s390/lib/
133drivers-y	+= drivers/s390/
134
135boot		:= arch/s390/boot
136syscalls	:= arch/s390/kernel/syscalls
137tools		:= arch/s390/tools
138
139all: bzImage
140
141#KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
142KBUILD_IMAGE	:= $(boot)/bzImage
143
144install:
145	sh -x $(srctree)/$(boot)/install.sh $(KERNELRELEASE) $(KBUILD_IMAGE) \
146	      System.map "$(INSTALL_PATH)"
147
148bzImage: vmlinux
149	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
150
151zfcpdump:
152	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
153
154vdso_install:
155	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
156
157archheaders:
158	$(Q)$(MAKE) $(build)=$(syscalls) uapi
159
160archprepare:
161	$(Q)$(MAKE) $(build)=$(syscalls) kapi
162	$(Q)$(MAKE) $(build)=$(tools) kapi
163ifeq ($(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
169# this hack.
170prepare: vdso_prepare
171vdso_prepare: prepare0
172	$(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
173	$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
174		$(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
175endif
176
177# Don't use tabs in echo arguments
178define archhelp
179  echo	'* bzImage         - Kernel image for IPL ($(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)'
184endef
185