arch/s390/Makefile

   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
  11 LD_BFD          := elf64-s390
  12 KBUILD_LDFLAGS  := -m elf64_s390
  13 KBUILD_AFLAGS_MODULE += -fPIC
  14 KBUILD_CFLAGS_MODULE += -fPIC
  15 KBUILD_AFLAGS   += -m64
  16 KBUILD_CFLAGS   += -m64
  17 ifeq ($(CONFIG_RELOCATABLE),y)
  18 KBUILD_CFLAGS   += -fPIE
  19 LDFLAGS_vmlinux := -pie
  20 endif
  21 aflags_dwarf    := -Wa,-gdwarf-2
  22 KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
  23 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 += $(call cc-disable-warning, address-of-packed-member)
  31 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
  32 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
  33 UTS_MACHINE     := s390x
  34 STACK_SIZE      := $(if $(CONFIG_KASAN),65536,16384)
  35 CHECKFLAGS      += -D__s390__ -D__s390x__
  36
  37 export LD_BFD
  38
  39 mflags-$(CONFIG_MARCH_Z10)    := -march=z10
  40 mflags-$(CONFIG_MARCH_Z196)   := -march=z196
  41 mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
  42 mflags-$(CONFIG_MARCH_Z13)    := -march=z13
  43 mflags-$(CONFIG_MARCH_Z14)    := -march=z14
  44 mflags-$(CONFIG_MARCH_Z15)    := -march=z15
  45
  46 export CC_FLAGS_MARCH := $(mflags-y)
  47
  48 aflags-y += $(mflags-y)
  49 cflags-y += $(mflags-y)
  50
  51 cflags-$(CONFIG_MARCH_Z10_TUNE)         += -mtune=z10
  52 cflags-$(CONFIG_MARCH_Z196_TUNE)        += -mtune=z196
  53 cflags-$(CONFIG_MARCH_ZEC12_TUNE)       += -mtune=zEC12
  54 cflags-$(CONFIG_MARCH_Z13_TUNE)         += -mtune=z13
  55 cflags-$(CONFIG_MARCH_Z14_TUNE)         += -mtune=z14
  56 cflags-$(CONFIG_MARCH_Z15_TUNE)         += -mtune=z15
  57
  58 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
  59
  60 #
  61 # Prevent tail-call optimizations, to get clearer backtraces:
  62 #
  63 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
  64
  65 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
  66 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
  67
  68 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
  69   CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
  70   ifeq ($(call cc-option,-mstack-size=8192),)
  71     CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
  72   endif
  73   export CC_FLAGS_CHECK_STACK
  74   cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
  75 endif
  76
  77 ifdef CONFIG_EXPOLINE
  78   ifdef CONFIG_EXPOLINE_EXTERN
  79     KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline.o
  80     CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
  81     CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
  82   else
  83     CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
  84     CC_FLAGS_EXPOLINE += -mfunction-return=thunk
  85   endif
  86   CC_FLAGS_EXPOLINE += -mindirect-branch-table
  87   export CC_FLAGS_EXPOLINE
  88   cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
  89   aflags-y += -DCC_USING_EXPOLINE
  90 endif
  91
  92 ifdef CONFIG_FUNCTION_TRACER
  93   ifeq ($(call cc-option,-mfentry -mnop-mcount),)
  94     # make use of hotpatch feature if the compiler supports it
  95     cc_hotpatch := -mhotpatch=0,3
  96     ifneq ($(call cc-option,$(cc_hotpatch)),)
  97       CC_FLAGS_FTRACE := $(cc_hotpatch)
  98       KBUILD_AFLAGS     += -DCC_USING_HOTPATCH
  99       KBUILD_CFLAGS     += -DCC_USING_HOTPATCH
 100     endif
 101   endif
 102 endif
 103
 104 # Test CFI features of binutils
 105 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
 106
 107 KBUILD_CFLAGS   += -mpacked-stack -mbackchain -msoft-float $(cflags-y)
 108 KBUILD_CFLAGS   += -pipe -Wno-sign-compare
 109 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables $(cfi)
 110 KBUILD_AFLAGS   += $(aflags-y) $(cfi)
 111 export KBUILD_AFLAGS_DECOMPRESSOR
 112 export KBUILD_CFLAGS_DECOMPRESSOR
 113
 114 OBJCOPYFLAGS    := -O binary
 115
 116 head-y          := arch/s390/kernel/head64.o
 117
 118 libs-y          += arch/s390/lib/
 119 drivers-y       += drivers/s390/
 120
 121 boot            := arch/s390/boot
 122 syscalls        := arch/s390/kernel/syscalls
 123 tools           := arch/s390/tools
 124
 125 all: bzImage
 126
 127 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
 128 KBUILD_IMAGE    := $(boot)/bzImage
 129
 130 install:
 131         sh -x $(srctree)/$(boot)/install.sh $(KERNELRELEASE) $(KBUILD_IMAGE) \
 132               System.map "$(INSTALL_PATH)"
 133
 134 bzImage: vmlinux
 135         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 136
 137 zfcpdump:
 138         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 139
 140 vdso_install:
 141         $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
 142
 143 archheaders:
 144         $(Q)$(MAKE) $(build)=$(syscalls) uapi
 145
 146 archprepare:
 147         $(Q)$(MAKE) $(build)=$(syscalls) kapi
 148         $(Q)$(MAKE) $(build)=$(tools) kapi
 149 ifeq ($(KBUILD_EXTMOD),)
 150 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 151 # In order to do that, we should use the archprepare target, but we can't since
 152 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 153 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 154 # Therefore we need to generate the header after prepare0 has been made, hence
 155 # this hack.
 156 prepare: vdso_prepare
 157 vdso_prepare: prepare0
 158         $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
 159         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 160                 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
 161 endif
 162
 163 # Don't use tabs in echo arguments
 164 define archhelp
 165   echo  '* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
 166   echo  '  install         - Install kernel using'
 167   echo  '                    (your) ~/bin/$(INSTALLKERNEL) or'
 168   echo  '                    (distribution) /sbin/$(INSTALLKERNEL) or'
 169   echo  '                    install to $$(INSTALL_PATH)'
 170 endef