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 ifndef CONFIG_AS_IS_LLVM
  24 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
  25 endif
  26 KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
  27 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
  28 KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
  29 KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
  30 KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
  31 KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
  32 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
  33 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
  34 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
  35
  36 ifdef CONFIG_CC_IS_GCC
  37         ifeq ($(call cc-ifversion, -ge, 1200, y), y)
  38                 ifeq ($(call cc-ifversion, -lt, 1300, y), y)
  39                         KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
  40                         KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds)
  41                 endif
  42         endif
  43 endif
  44
  45 UTS_MACHINE     := s390x
  46 STACK_SIZE      := $(if $(CONFIG_KASAN),65536,16384)
  47 CHECKFLAGS      += -D__s390__ -D__s390x__
  48
  49 export LD_BFD
  50
  51 mflags-$(CONFIG_MARCH_Z10)    := -march=z10
  52 mflags-$(CONFIG_MARCH_Z196)   := -march=z196
  53 mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
  54 mflags-$(CONFIG_MARCH_Z13)    := -march=z13
  55 mflags-$(CONFIG_MARCH_Z14)    := -march=z14
  56 mflags-$(CONFIG_MARCH_Z15)    := -march=z15
  57 mflags-$(CONFIG_MARCH_Z16)    := -march=z16
  58
  59 export CC_FLAGS_MARCH := $(mflags-y)
  60
  61 aflags-y += $(mflags-y)
  62 cflags-y += $(mflags-y)
  63
  64 cflags-$(CONFIG_MARCH_Z10_TUNE)         += -mtune=z10
  65 cflags-$(CONFIG_MARCH_Z196_TUNE)        += -mtune=z196
  66 cflags-$(CONFIG_MARCH_ZEC12_TUNE)       += -mtune=zEC12
  67 cflags-$(CONFIG_MARCH_Z13_TUNE)         += -mtune=z13
  68 cflags-$(CONFIG_MARCH_Z14_TUNE)         += -mtune=z14
  69 cflags-$(CONFIG_MARCH_Z15_TUNE)         += -mtune=z15
  70 cflags-$(CONFIG_MARCH_Z16_TUNE)         += -mtune=z16
  71
  72 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
  73
  74 #
  75 # Prevent tail-call optimizations, to get clearer backtraces:
  76 #
  77 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
  78
  79 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
  80 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
  81
  82 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
  83   CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
  84   ifeq ($(call cc-option,-mstack-size=8192),)
  85     CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
  86   endif
  87   export CC_FLAGS_CHECK_STACK
  88   cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
  89 endif
  90
  91 ifdef CONFIG_EXPOLINE
  92   ifdef CONFIG_EXPOLINE_EXTERN
  93     KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline.o
  94     CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
  95     CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
  96   else
  97     CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
  98     CC_FLAGS_EXPOLINE += -mfunction-return=thunk
  99   endif
 100   CC_FLAGS_EXPOLINE += -mindirect-branch-table
 101   export CC_FLAGS_EXPOLINE
 102   cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
 103   aflags-y += -DCC_USING_EXPOLINE
 104 endif
 105
 106 ifdef CONFIG_FUNCTION_TRACER
 107   ifeq ($(call cc-option,-mfentry -mnop-mcount),)
 108     # make use of hotpatch feature if the compiler supports it
 109     cc_hotpatch := -mhotpatch=0,3
 110     ifneq ($(call cc-option,$(cc_hotpatch)),)
 111       CC_FLAGS_FTRACE := $(cc_hotpatch)
 112       KBUILD_AFLAGS     += -DCC_USING_HOTPATCH
 113       KBUILD_CFLAGS     += -DCC_USING_HOTPATCH
 114     endif
 115   endif
 116 endif
 117
 118 # Test CFI features of binutils
 119 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
 120
 121 KBUILD_CFLAGS   += -mpacked-stack -mbackchain -msoft-float $(cflags-y)
 122 KBUILD_CFLAGS   += -pipe -Wno-sign-compare
 123 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables $(cfi)
 124 KBUILD_AFLAGS   += $(aflags-y) $(cfi)
 125 export KBUILD_AFLAGS_DECOMPRESSOR
 126 export KBUILD_CFLAGS_DECOMPRESSOR
 127
 128 OBJCOPYFLAGS    := -O binary
 129
 130 head-y          := arch/s390/kernel/head64.o
 131
 132 libs-y          += arch/s390/lib/
 133 drivers-y       += drivers/s390/
 134
 135 boot            := arch/s390/boot
 136 syscalls        := arch/s390/kernel/syscalls
 137 tools           := arch/s390/tools
 138
 139 all: bzImage
 140
 141 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
 142 KBUILD_IMAGE    := $(boot)/bzImage
 143
 144 install:
 145         sh -x $(srctree)/$(boot)/install.sh $(KERNELRELEASE) $(KBUILD_IMAGE) \
 146               System.map "$(INSTALL_PATH)"
 147
 148 bzImage: vmlinux
 149         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 150
 151 zfcpdump:
 152         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 153
 154 vdso_install:
 155         $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
 156
 157 archheaders:
 158         $(Q)$(MAKE) $(build)=$(syscalls) uapi
 159
 160 archprepare:
 161         $(Q)$(MAKE) $(build)=$(syscalls) kapi
 162         $(Q)$(MAKE) $(build)=$(tools) kapi
 163 ifeq ($(KBUILD_EXTMOD),)
 164 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 165 # In order to do that, we should use the archprepare target, but we can't since
 166 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 167 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 168 # Therefore we need to generate the header after prepare0 has been made, hence
 169 # this hack.
 170 prepare: vdso_prepare
 171 vdso_prepare: prepare0
 172         $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
 173         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 174                 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
 175 endif
 176
 177 # Don't use tabs in echo arguments
 178 define archhelp
 179   echo  '* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
 180   echo  '  install         - Install kernel using'
 181   echo  '                    (your) ~/bin/$(INSTALLKERNEL) or'
 182   echo  '                    (distribution) /sbin/$(INSTALLKERNEL) or'
 183   echo  '                    install to $$(INSTALL_PATH)'
 184 endef