xref: /linux/arch/s390/Makefile (revision dbcedec3a31119d7594baacc743300d127c99c56) 
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
17ifdef CONFIG_PIE_BUILD
18KBUILD_CFLAGS	+= -fPIE
19LDFLAGS_vmlinux	:= -pie -z notext
20else
21KBUILD_CFLAGS	+= $(call cc-option,-munaligned-symbols,)
22LDFLAGS_vmlinux	:= --emit-relocs --discard-none
23extra_tools	:= relocs
24endif
25aflags_dwarf	:= -Wa,-gdwarf-2
26KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
27ifndef CONFIG_AS_IS_LLVM
28KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
29endif
30KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
31KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
32KBUILD_CFLAGS_DECOMPRESSOR += -D__DECOMPRESSOR
33KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
34KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
35KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
36KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
37KBUILD_CFLAGS_DECOMPRESSOR += -fPIE
38KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
39KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
40KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
41KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)
42
43UTS_MACHINE	:= s390x
44STACK_SIZE	:= $(if $(CONFIG_KASAN),65536,16384)
45CHECKFLAGS	+= -D__s390__ -D__s390x__
46
47export LD_BFD
48
49mflags-$(CONFIG_MARCH_Z10)    := -march=z10
50mflags-$(CONFIG_MARCH_Z196)   := -march=z196
51mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
52mflags-$(CONFIG_MARCH_Z13)    := -march=z13
53mflags-$(CONFIG_MARCH_Z14)    := -march=z14
54mflags-$(CONFIG_MARCH_Z15)    := -march=z15
55mflags-$(CONFIG_MARCH_Z16)    := -march=z16
56
57export CC_FLAGS_MARCH := $(mflags-y)
58
59aflags-y += $(mflags-y)
60cflags-y += $(mflags-y)
61
62cflags-$(CONFIG_MARCH_Z10_TUNE)		+= -mtune=z10
63cflags-$(CONFIG_MARCH_Z196_TUNE)	+= -mtune=z196
64cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12
65cflags-$(CONFIG_MARCH_Z13_TUNE)		+= -mtune=z13
66cflags-$(CONFIG_MARCH_Z14_TUNE)		+= -mtune=z14
67cflags-$(CONFIG_MARCH_Z15_TUNE)		+= -mtune=z15
68cflags-$(CONFIG_MARCH_Z16_TUNE)		+= -mtune=z16
69
70cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
71
72#
73# Prevent tail-call optimizations, to get clearer backtraces:
74#
75cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
76
77KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
78KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
79
80ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
81  CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
82  ifeq ($(call cc-option,-mstack-size=8192),)
83    CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
84  endif
85  export CC_FLAGS_CHECK_STACK
86  cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
87endif
88
89ifdef CONFIG_EXPOLINE
90  ifdef CONFIG_EXPOLINE_EXTERN
91    KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline/expoline.o
92    CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
93    CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
94  else
95    CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
96    CC_FLAGS_EXPOLINE += -mfunction-return=thunk
97  endif
98  CC_FLAGS_EXPOLINE += -mindirect-branch-table
99  export CC_FLAGS_EXPOLINE
100  cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
101  aflags-y += -DCC_USING_EXPOLINE
102endif
103
104ifdef CONFIG_FUNCTION_TRACER
105  ifeq ($(call cc-option,-mfentry -mnop-mcount),)
106    # make use of hotpatch feature if the compiler supports it
107    cc_hotpatch	:= -mhotpatch=0,3
108    ifneq ($(call cc-option,$(cc_hotpatch)),)
109      CC_FLAGS_FTRACE := $(cc_hotpatch)
110      KBUILD_AFLAGS	+= -DCC_USING_HOTPATCH
111      KBUILD_CFLAGS	+= -DCC_USING_HOTPATCH
112    endif
113  endif
114endif
115
116# Test CFI features of binutils
117cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
118
119KBUILD_CFLAGS	+= -mpacked-stack -mbackchain -msoft-float $(cflags-y)
120KBUILD_CFLAGS	+= -pipe -Wno-sign-compare
121KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables $(cfi)
122KBUILD_AFLAGS	+= $(aflags-y) $(cfi)
123export KBUILD_AFLAGS_DECOMPRESSOR
124export KBUILD_CFLAGS_DECOMPRESSOR
125
126OBJCOPYFLAGS	:= -O binary
127
128libs-y		+= arch/s390/lib/
129
130boot		:= arch/s390/boot
131syscalls	:= arch/s390/kernel/syscalls
132tools		:= arch/s390/tools
133
134all: bzImage
135
136#KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
137KBUILD_IMAGE	:= $(boot)/bzImage
138
139install:
140	$(call cmd,install)
141
142bzImage: vmlinux
143	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
144
145zfcpdump:
146	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
147
148archheaders:
149	$(Q)$(MAKE) $(build)=$(syscalls) uapi
150
151archprepare:
152	$(Q)$(MAKE) $(build)=$(syscalls) kapi
153	$(Q)$(MAKE) $(build)=$(tools) kapi $(extra_tools)
154ifeq ($(KBUILD_EXTMOD),)
155# We need to generate vdso-offsets.h before compiling certain files in kernel/.
156# In order to do that, we should use the archprepare target, but we can't since
157# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
158# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
159# Therefore we need to generate the header after prepare0 has been made, hence
160# this hack.
161prepare: vdso_prepare
162vdso_prepare: prepare0
163	$(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
164	$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
165		$(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
166
167vdso-install-y			+= arch/s390/kernel/vdso64/vdso64.so.dbg
168vdso-install-$(CONFIG_COMPAT)	+= arch/s390/kernel/vdso32/vdso32.so.dbg
169
170ifdef CONFIG_EXPOLINE_EXTERN
171modules_prepare: expoline_prepare
172expoline_prepare: scripts
173	$(Q)$(MAKE) $(build)=arch/s390/lib/expoline arch/s390/lib/expoline/expoline.o
174endif
175endif
176
177# Don't use tabs in echo arguments
178define archhelp
179  echo	'* bzImage         - Kernel image for IPL ($(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