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