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.
8 # Copyright (C) 1994 by Linus Torvalds
12 KBUILD_LDFLAGS
:= -m elf64_s390
13 KBUILD_AFLAGS_MODULE
+= -fPIC
14 KBUILD_CFLAGS_MODULE
+= -fPIC
17 KBUILD_CFLAGS
+= -fPIE
18 LDFLAGS_vmlinux
:= -pie
-z notext
19 aflags_dwarf
:= -Wa
,-gdwarf-2
20 KBUILD_AFLAGS_DECOMPRESSOR
:= $(CLANG_FLAGS
) -m64
-D__ASSEMBLY__
21 ifndef CONFIG_AS_IS_LLVM
22 KBUILD_AFLAGS_DECOMPRESSOR
+= $(if
$(CONFIG_DEBUG_INFO
),$(aflags_dwarf
))
24 KBUILD_CFLAGS_DECOMPRESSOR
:= $(CLANG_FLAGS
) -m64
-O2
-mpacked-stack
25 KBUILD_CFLAGS_DECOMPRESSOR
+= -DDISABLE_BRANCH_PROFILING
-D__NO_FORTIFY
26 KBUILD_CFLAGS_DECOMPRESSOR
+= -fno-delete-null-pointer-checks
-msoft-float
-mbackchain
27 KBUILD_CFLAGS_DECOMPRESSOR
+= -fno-asynchronous-unwind-tables
28 KBUILD_CFLAGS_DECOMPRESSOR
+= -ffreestanding
29 KBUILD_CFLAGS_DECOMPRESSOR
+= -fno-stack-protector
30 KBUILD_CFLAGS_DECOMPRESSOR
+= -fPIE
31 KBUILD_CFLAGS_DECOMPRESSOR
+= $(call cc-disable-warning
, address-of-packed-member
)
32 KBUILD_CFLAGS_DECOMPRESSOR
+= $(if
$(CONFIG_DEBUG_INFO
),-g
)
33 KBUILD_CFLAGS_DECOMPRESSOR
+= $(if
$(CONFIG_DEBUG_INFO_DWARF4
), $(call cc-option
, -gdwarf-4
,))
34 KBUILD_CFLAGS_DECOMPRESSOR
+= $(if
$(CONFIG_CC_NO_ARRAY_BOUNDS
),-Wno-array-bounds
)
37 STACK_SIZE
:= $(if
$(CONFIG_KASAN
),65536,16384)
38 CHECKFLAGS
+= -D__s390__
-D__s390x__
42 mflags-
$(CONFIG_MARCH_Z10
) := -march
=z10
43 mflags-
$(CONFIG_MARCH_Z196
) := -march
=z196
44 mflags-
$(CONFIG_MARCH_ZEC12
) := -march
=zEC12
45 mflags-
$(CONFIG_MARCH_Z13
) := -march
=z13
46 mflags-
$(CONFIG_MARCH_Z14
) := -march
=z14
47 mflags-
$(CONFIG_MARCH_Z15
) := -march
=z15
48 mflags-
$(CONFIG_MARCH_Z16
) := -march
=z16
50 export CC_FLAGS_MARCH
:= $(mflags-y
)
52 aflags-y
+= $(mflags-y
)
53 cflags-y
+= $(mflags-y
)
55 cflags-
$(CONFIG_MARCH_Z10_TUNE
) += -mtune
=z10
56 cflags-
$(CONFIG_MARCH_Z196_TUNE
) += -mtune
=z196
57 cflags-
$(CONFIG_MARCH_ZEC12_TUNE
) += -mtune
=zEC12
58 cflags-
$(CONFIG_MARCH_Z13_TUNE
) += -mtune
=z13
59 cflags-
$(CONFIG_MARCH_Z14_TUNE
) += -mtune
=z14
60 cflags-
$(CONFIG_MARCH_Z15_TUNE
) += -mtune
=z15
61 cflags-
$(CONFIG_MARCH_Z16_TUNE
) += -mtune
=z16
63 cflags-y
+= -Wa
,-I
$(srctree
)/arch
/$(ARCH
)/include
66 # Prevent tail-call optimizations, to get clearer backtraces:
68 cflags-
$(CONFIG_FRAME_POINTER
) += -fno-optimize-sibling-calls
70 KBUILD_AFLAGS_DECOMPRESSOR
+= $(aflags-y
)
71 KBUILD_CFLAGS_DECOMPRESSOR
+= $(cflags-y
)
73 ifneq ($(call cc-option
,-mstack-size
=8192 -mstack-guard
=128),)
74 CC_FLAGS_CHECK_STACK
:= -mstack-size
=$(STACK_SIZE
)
75 ifeq ($(call cc-option
,-mstack-size
=8192),)
76 CC_FLAGS_CHECK_STACK
+= -mstack-guard
=$(CONFIG_STACK_GUARD
)
78 export CC_FLAGS_CHECK_STACK
79 cflags-
$(CONFIG_CHECK_STACK
) += $(CC_FLAGS_CHECK_STACK
)
83 ifdef CONFIG_EXPOLINE_EXTERN
84 KBUILD_LDFLAGS_MODULE
+= arch
/s390
/lib
/expoline
/expoline.o
85 CC_FLAGS_EXPOLINE
:= -mindirect-branch
=thunk-extern
86 CC_FLAGS_EXPOLINE
+= -mfunction-return
=thunk-extern
88 CC_FLAGS_EXPOLINE
:= -mindirect-branch
=thunk
89 CC_FLAGS_EXPOLINE
+= -mfunction-return
=thunk
91 CC_FLAGS_EXPOLINE
+= -mindirect-branch-table
92 export CC_FLAGS_EXPOLINE
93 cflags-y
+= $(CC_FLAGS_EXPOLINE
) -DCC_USING_EXPOLINE
94 aflags-y
+= -DCC_USING_EXPOLINE
97 ifdef CONFIG_FUNCTION_TRACER
98 ifeq ($(call cc-option
,-mfentry
-mnop-mcount
),)
99 # make use of hotpatch feature if the compiler supports it
100 cc_hotpatch
:= -mhotpatch
=0,3
101 ifneq ($(call cc-option
,$(cc_hotpatch
)),)
102 CC_FLAGS_FTRACE
:= $(cc_hotpatch
)
103 KBUILD_AFLAGS
+= -DCC_USING_HOTPATCH
104 KBUILD_CFLAGS
+= -DCC_USING_HOTPATCH
109 # Test CFI features of binutils
110 cfi
:= $(call as-instr
,.cfi_startproc
\n.cfi_val_offset
15$(comma
)-160\n.cfi_endproc
,-DCONFIG_AS_CFI_VAL_OFFSET
=1)
112 KBUILD_CFLAGS
+= -mpacked-stack
-mbackchain
-msoft-float
$(cflags-y
)
113 KBUILD_CFLAGS
+= -pipe
-Wno-sign-compare
114 KBUILD_CFLAGS
+= -fno-asynchronous-unwind-tables
$(cfi
)
115 KBUILD_AFLAGS
+= $(aflags-y
) $(cfi
)
116 export KBUILD_AFLAGS_DECOMPRESSOR
117 export KBUILD_CFLAGS_DECOMPRESSOR
119 OBJCOPYFLAGS
:= -O binary
121 libs-y
+= arch
/s390
/lib
/
123 boot
:= arch
/s390
/boot
124 syscalls
:= arch
/s390
/kernel
/syscalls
125 tools
:= arch
/s390
/tools
129 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
130 KBUILD_IMAGE
:= $(boot
)/bzImage
136 $(Q
)$(MAKE
) $(build
)=$(boot
) $(boot
)/$@
139 $(Q
)$(MAKE
) $(build
)=$(boot
) $(boot
)/$@
142 $(Q
)$(MAKE
) $(build
)=$(syscalls
) uapi
145 $(Q
)$(MAKE
) $(build
)=$(syscalls
) kapi
146 $(Q
)$(MAKE
) $(build
)=$(tools
) kapi
147 ifeq ($(KBUILD_EXTMOD
),)
148 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
149 # In order to do that, we should use the archprepare target, but we can't since
150 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
151 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
152 # Therefore we need to generate the header after prepare0 has been made, hence
154 prepare
: vdso_prepare
155 vdso_prepare
: prepare0
156 $(Q
)$(MAKE
) $(build
)=arch
/s390
/kernel
/vdso64
include/generated
/vdso64-offsets.h
157 $(if
$(CONFIG_COMPAT
),$(Q
)$(MAKE
) \
158 $(build
)=arch
/s390
/kernel
/vdso32
include/generated
/vdso32-offsets.h
)
160 vdso-install-y
+= arch
/s390
/kernel
/vdso64
/vdso64.so.dbg
161 vdso-install-
$(CONFIG_COMPAT
) += arch
/s390
/kernel
/vdso32
/vdso32.so.dbg
163 ifdef CONFIG_EXPOLINE_EXTERN
164 modules_prepare
: expoline_prepare
165 expoline_prepare
: scripts
166 $(Q
)$(MAKE
) $(build
)=arch
/s390
/lib
/expoline arch
/s390
/lib
/expoline
/expoline.o
170 # Don't use tabs in echo arguments
172 echo
'* bzImage - Kernel image for IPL ($(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)'