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), $(call cc-option, -gdwarf-4,))
  33
  34 ifdef CONFIG_CC_IS_GCC
  35         ifeq ($(call cc-ifversion, -ge, 1200, y), y)
  36                 ifeq ($(call cc-ifversion, -lt, 1300, y), y)
  37                         KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
  38                         KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds)
  39                 endif
  40         endif
  41 endif
  42
  43 UTS_MACHINE     := s390x
  44 STACK_SIZE      := $(if $(CONFIG_KASAN),65536,16384)
  45 CHECKFLAGS      += -D__s390__ -D__s390x__
  46
  47 export LD_BFD
  48
  49 mflags-$(CONFIG_MARCH_Z10)    := -march=z10
  50 mflags-$(CONFIG_MARCH_Z196)   := -march=z196
  51 mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
  52 mflags-$(CONFIG_MARCH_Z13)    := -march=z13
  53 mflags-$(CONFIG_MARCH_Z14)    := -march=z14
  54 mflags-$(CONFIG_MARCH_Z15)    := -march=z15
  55 mflags-$(CONFIG_MARCH_Z16)    := -march=z16
  56
  57 export CC_FLAGS_MARCH := $(mflags-y)
  58
  59 aflags-y += $(mflags-y)
  60 cflags-y += $(mflags-y)
  61
  62 cflags-$(CONFIG_MARCH_Z10_TUNE)         += -mtune=z10
  63 cflags-$(CONFIG_MARCH_Z196_TUNE)        += -mtune=z196
  64 cflags-$(CONFIG_MARCH_ZEC12_TUNE)       += -mtune=zEC12
  65 cflags-$(CONFIG_MARCH_Z13_TUNE)         += -mtune=z13
  66 cflags-$(CONFIG_MARCH_Z14_TUNE)         += -mtune=z14
  67 cflags-$(CONFIG_MARCH_Z15_TUNE)         += -mtune=z15
  68 cflags-$(CONFIG_MARCH_Z16_TUNE)         += -mtune=z16
  69
  70 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
  71
  72 #
  73 # Prevent tail-call optimizations, to get clearer backtraces:
  74 #
  75 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
  76
  77 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
  78 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
  79
  80 ifneq ($(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)
  87 endif
  88
  89 ifdef CONFIG_EXPOLINE
  90   ifdef CONFIG_EXPOLINE_EXTERN
  91     KBUILD_LDFLAGS_MODULE += arch/s390/lib/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 += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
 101   aflags-y += -DCC_USING_EXPOLINE
 102 endif
 103
 104 ifdef CONFIG_FUNCTION_TRACER
 105   ifeq ($(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
 114 endif
 115
 116 # Test CFI features of binutils
 117 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
 118
 119 KBUILD_CFLAGS   += -mpacked-stack -mbackchain -msoft-float $(cflags-y)
 120 KBUILD_CFLAGS   += -pipe -Wno-sign-compare
 121 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables $(cfi)
 122 KBUILD_AFLAGS   += $(aflags-y) $(cfi)
 123 export KBUILD_AFLAGS_DECOMPRESSOR
 124 export KBUILD_CFLAGS_DECOMPRESSOR
 125
 126 OBJCOPYFLAGS    := -O binary
 127
 128 head-y          := arch/s390/kernel/head64.o
 129
 130 libs-y          += arch/s390/lib/
 131 drivers-y       += drivers/s390/
 132
 133 boot            := arch/s390/boot
 134 syscalls        := arch/s390/kernel/syscalls
 135 tools           := arch/s390/tools
 136
 137 all: bzImage
 138
 139 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
 140 KBUILD_IMAGE    := $(boot)/bzImage
 141
 142 install:
 143         sh -x $(srctree)/$(boot)/install.sh $(KERNELRELEASE) $(KBUILD_IMAGE) \
 144               System.map "$(INSTALL_PATH)"
 145
 146 bzImage: vmlinux
 147         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 148
 149 zfcpdump:
 150         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 151
 152 vdso_install:
 153         $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
 154
 155 archheaders:
 156         $(Q)$(MAKE) $(build)=$(syscalls) uapi
 157
 158 archprepare:
 159         $(Q)$(MAKE) $(build)=$(syscalls) kapi
 160         $(Q)$(MAKE) $(build)=$(tools) kapi
 161 ifeq ($(KBUILD_EXTMOD),)
 162 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 163 # In order to do that, we should use the archprepare target, but we can't since
 164 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 165 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 166 # Therefore we need to generate the header after prepare0 has been made, hence
 167 # this hack.
 168 prepare: vdso_prepare
 169 vdso_prepare: prepare0
 170         $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
 171         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 172                 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
 173 endif
 174
 175 # Don't use tabs in echo arguments
 176 define archhelp
 177   echo  '* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
 178   echo  '  install         - Install kernel using'
 179   echo  '                    (your) ~/bin/$(INSTALLKERNEL) or'
 180   echo  '                    (distribution) /sbin/$(INSTALLKERNEL) or'
 181   echo  '                    install to $$(INSTALL_PATH)'
 182 endef