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. Remember to do have actions
7 # for "archclean" and "archdep" for cleaning up and making dependencies for
10 # Copyright (C) 1994 by Linus Torvalds
14 LDFLAGS := -m elf64_s390
15 KBUILD_AFLAGS_MODULE += -fPIC
16 KBUILD_CFLAGS_MODULE += -fPIC
21 CHECKFLAGS += -D__s390__ -D__s390x__ -mbig-endian
25 mflags-$(CONFIG_MARCH_Z900) := -march=z900
26 mflags-$(CONFIG_MARCH_Z990) := -march=z990
27 mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
28 mflags-$(CONFIG_MARCH_Z10) := -march=z10
29 mflags-$(CONFIG_MARCH_Z196) := -march=z196
30 mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12
31 mflags-$(CONFIG_MARCH_Z13) := -march=z13
32 mflags-$(CONFIG_MARCH_Z14) := -march=z14
34 export CC_FLAGS_MARCH := $(mflags-y)
36 aflags-y += $(mflags-y)
37 cflags-y += $(mflags-y)
39 cflags-$(CONFIG_MARCH_Z900_TUNE) += -mtune=z900
40 cflags-$(CONFIG_MARCH_Z990_TUNE) += -mtune=z990
41 cflags-$(CONFIG_MARCH_Z9_109_TUNE) += -mtune=z9-109
42 cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10
43 cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196
44 cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12
45 cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13
46 cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14
48 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
51 # Prevent tail-call optimizations, to get clearer backtraces:
53 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
55 # old style option for packed stacks
56 ifeq ($(call cc-option-yn,-mkernel-backchain),y)
57 cflags-$(CONFIG_PACK_STACK) += -mkernel-backchain -D__PACK_STACK
58 aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
61 # new style option for packed stacks
62 ifeq ($(call cc-option-yn,-mpacked-stack),y)
63 cflags-$(CONFIG_PACK_STACK) += -mpacked-stack -D__PACK_STACK
64 aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
67 ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)
68 cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
69 ifneq ($(call cc-option-yn,-mstack-size=8192),y)
70 cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
74 ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
75 cflags-$(CONFIG_WARN_DYNAMIC_STACK) += -mwarn-dynamicstack
79 ifeq ($(call cc-option-yn,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),y)
80 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
81 CC_FLAGS_EXPOLINE += -mfunction-return=thunk
82 CC_FLAGS_EXPOLINE += -mindirect-branch-table
83 export CC_FLAGS_EXPOLINE
84 cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
88 ifdef CONFIG_FUNCTION_TRACER
89 # make use of hotpatch feature if the compiler supports it
90 cc_hotpatch := -mhotpatch=0,3
91 ifeq ($(call cc-option-yn,$(cc_hotpatch)),y)
92 CC_FLAGS_FTRACE := $(cc_hotpatch)
93 KBUILD_AFLAGS += -DCC_USING_HOTPATCH
94 KBUILD_CFLAGS += -DCC_USING_HOTPATCH
98 # Test CFI features of binutils
99 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
101 KBUILD_CFLAGS += -mbackchain -msoft-float $(cflags-y)
102 KBUILD_CFLAGS += -pipe -fno-strength-reduce -Wno-sign-compare
103 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi)
104 KBUILD_AFLAGS += $(aflags-y) $(cfi)
106 OBJCOPYFLAGS := -O binary
108 head-y := arch/s390/kernel/head.o
109 head-y += arch/s390/kernel/head64.o
111 # See arch/s390/Kbuild for content of core part of the kernel
114 libs-y += arch/s390/lib/
115 drivers-y += drivers/s390/
117 # must be linked after kernel
118 drivers-$(CONFIG_OPROFILE) += arch/s390/oprofile/
120 boot := arch/s390/boot
121 syscalls := arch/s390/kernel/syscalls
122 tools := arch/s390/tools
126 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
127 KBUILD_IMAGE := $(boot)/bzImage
130 $(Q)$(MAKE) $(build)=$(boot) $@
132 image bzImage: vmlinux
133 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
136 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
139 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
140 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
143 $(Q)$(MAKE) $(clean)=$(boot)
144 $(Q)$(MAKE) $(clean)=$(tools)
147 $(Q)$(MAKE) $(build)=$(syscalls) uapi
150 $(Q)$(MAKE) $(build)=$(syscalls) kapi
151 $(Q)$(MAKE) $(build)=$(tools) kapi
153 # Don't use tabs in echo arguments
155 echo '* image - Kernel image for IPL ($(boot)/image)'
156 echo '* bzImage - Compressed kernel image for IPL ($(boot)/bzImage)'
157 echo ' install - Install kernel using'
158 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
159 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
160 echo ' install to $$(INSTALL_PATH)'