xref: /openbmc/linux/arch/s390/Makefile (revision 8e7a49e0) 
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
17KBUILD_CFLAGS	+= -fPIE
18LDFLAGS_vmlinux	:= -pie
19aflags_dwarf	:= -Wa,-gdwarf-2
20KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
21ifndef CONFIG_AS_IS_LLVM
22KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
23endif
24KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
25KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
26KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
27KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
28KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
29KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
30KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
31KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
32KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
33KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)
34
35UTS_MACHINE	:= s390x
36STACK_SIZE	:= $(if $(CONFIG_KASAN),65536,16384)
37CHECKFLAGS	+= -D__s390__ -D__s390x__
38
39export LD_BFD
40
41mflags-$(CONFIG_MARCH_Z10)    := -march=z10
42mflags-$(CONFIG_MARCH_Z196)   := -march=z196
43mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
44mflags-$(CONFIG_MARCH_Z13)    := -march=z13
45mflags-$(CONFIG_MARCH_Z14)    := -march=z14
46mflags-$(CONFIG_MARCH_Z15)    := -march=z15
47mflags-$(CONFIG_MARCH_Z16)    := -march=z16
48
49export CC_FLAGS_MARCH := $(mflags-y)
50
51aflags-y += $(mflags-y)
52cflags-y += $(mflags-y)
53
54cflags-$(CONFIG_MARCH_Z10_TUNE)		+= -mtune=z10
55cflags-$(CONFIG_MARCH_Z196_TUNE)	+= -mtune=z196
56cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12
57cflags-$(CONFIG_MARCH_Z13_TUNE)		+= -mtune=z13
58cflags-$(CONFIG_MARCH_Z14_TUNE)		+= -mtune=z14
59cflags-$(CONFIG_MARCH_Z15_TUNE)		+= -mtune=z15
60cflags-$(CONFIG_MARCH_Z16_TUNE)		+= -mtune=z16
61
62cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
63
64#
65# Prevent tail-call optimizations, to get clearer backtraces:
66#
67cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
68
69KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
70KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
71
72ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
73  CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
74  ifeq ($(call cc-option,-mstack-size=8192),)
75    CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
76  endif
77  export CC_FLAGS_CHECK_STACK
78  cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
79endif
80
81ifdef CONFIG_EXPOLINE
82  ifdef CONFIG_EXPOLINE_EXTERN
83    KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline/expoline.o
84    CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
85    CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
86  else
87    CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
88    CC_FLAGS_EXPOLINE += -mfunction-return=thunk
89  endif
90  CC_FLAGS_EXPOLINE += -mindirect-branch-table
91  export CC_FLAGS_EXPOLINE
92  cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
93  aflags-y += -DCC_USING_EXPOLINE
94endif
95
96ifdef CONFIG_FUNCTION_TRACER
97  ifeq ($(call cc-option,-mfentry -mnop-mcount),)
98    # make use of hotpatch feature if the compiler supports it
99    cc_hotpatch	:= -mhotpatch=0,3
100    ifneq ($(call cc-option,$(cc_hotpatch)),)
101      CC_FLAGS_FTRACE := $(cc_hotpatch)
102      KBUILD_AFLAGS	+= -DCC_USING_HOTPATCH
103      KBUILD_CFLAGS	+= -DCC_USING_HOTPATCH
104    endif
105  endif
106endif
107
108# Test CFI features of binutils
109cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
110
111KBUILD_CFLAGS	+= -mpacked-stack -mbackchain -msoft-float $(cflags-y)
112KBUILD_CFLAGS	+= -pipe -Wno-sign-compare
113KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables $(cfi)
114KBUILD_AFLAGS	+= $(aflags-y) $(cfi)
115export KBUILD_AFLAGS_DECOMPRESSOR
116export KBUILD_CFLAGS_DECOMPRESSOR
117
118OBJCOPYFLAGS	:= -O binary
119
120libs-y		+= arch/s390/lib/
121drivers-y	+= drivers/s390/
122
123boot		:= arch/s390/boot
124syscalls	:= arch/s390/kernel/syscalls
125tools		:= arch/s390/tools
126
127all: bzImage
128
129#KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
130KBUILD_IMAGE	:= $(boot)/bzImage
131
132install:
133	$(call cmd,install)
134
135bzImage: vmlinux
136	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
137
138zfcpdump:
139	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
140
141vdso_install:
142	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
143
144archheaders:
145	$(Q)$(MAKE) $(build)=$(syscalls) uapi
146
147archprepare:
148	$(Q)$(MAKE) $(build)=$(syscalls) kapi
149	$(Q)$(MAKE) $(build)=$(tools) kapi
150ifeq ($(KBUILD_EXTMOD),)
151# We need to generate vdso-offsets.h before compiling certain files in kernel/.
152# In order to do that, we should use the archprepare target, but we can't since
153# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
154# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
155# Therefore we need to generate the header after prepare0 has been made, hence
156# this hack.
157prepare: vdso_prepare
158vdso_prepare: prepare0
159	$(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
160	$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
161		$(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
162
163ifdef CONFIG_EXPOLINE_EXTERN
164modules_prepare: expoline_prepare
165expoline_prepare:
166	$(Q)$(MAKE) $(build)=arch/s390/lib/expoline arch/s390/lib/expoline/expoline.o
167endif
168endif
169
170# Don't use tabs in echo arguments
171define archhelp
172  echo	'* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
173  echo	'  install         - Install kernel using'
174  echo	'                    (your) ~/bin/$(INSTALLKERNEL) or'
175  echo	'                    (distribution) /sbin/$(INSTALLKERNEL) or'
176  echo	'                    install to $$(INSTALL_PATH)'
177endef
178