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 KBUILD_CFLAGS   += -fPIE
  18 LDFLAGS_vmlinux := -pie
  19 aflags_dwarf    := -Wa,-gdwarf-2
  20 KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
  21 ifndef CONFIG_AS_IS_LLVM
  22 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
  23 endif
  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 += -fPIE
  31 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
  32 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
  33 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
  34 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)
  35
  36 UTS_MACHINE     := s390x
  37 STACK_SIZE      := $(if $(CONFIG_KASAN),65536,16384)
  38 CHECKFLAGS      += -D__s390__ -D__s390x__
  39
  40 export LD_BFD
  41
  42 mflags-$(CONFIG_MARCH_Z10)    := -march=z10
  43 mflags-$(CONFIG_MARCH_Z196)   := -march=z196
  44 mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
  45 mflags-$(CONFIG_MARCH_Z13)    := -march=z13
  46 mflags-$(CONFIG_MARCH_Z14)    := -march=z14
  47 mflags-$(CONFIG_MARCH_Z15)    := -march=z15
  48 mflags-$(CONFIG_MARCH_Z16)    := -march=z16
  49
  50 export CC_FLAGS_MARCH := $(mflags-y)
  51
  52 aflags-y += $(mflags-y)
  53 cflags-y += $(mflags-y)
  54
  55 cflags-$(CONFIG_MARCH_Z10_TUNE)         += -mtune=z10
  56 cflags-$(CONFIG_MARCH_Z196_TUNE)        += -mtune=z196
  57 cflags-$(CONFIG_MARCH_ZEC12_TUNE)       += -mtune=zEC12
  58 cflags-$(CONFIG_MARCH_Z13_TUNE)         += -mtune=z13
  59 cflags-$(CONFIG_MARCH_Z14_TUNE)         += -mtune=z14
  60 cflags-$(CONFIG_MARCH_Z15_TUNE)         += -mtune=z15
  61 cflags-$(CONFIG_MARCH_Z16_TUNE)         += -mtune=z16
  62
  63 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
  64
  65 #
  66 # Prevent tail-call optimizations, to get clearer backtraces:
  67 #
  68 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
  69
  70 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
  71 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
  72
  73 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
  74   CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
  75   ifeq ($(call cc-option,-mstack-size=8192),)
  76     CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
  77   endif
  78   export CC_FLAGS_CHECK_STACK
  79   cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
  80 endif
  81
  82 ifdef CONFIG_EXPOLINE
  83   ifdef CONFIG_EXPOLINE_EXTERN
  84     KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline/expoline.o
  85     CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
  86     CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
  87   else
  88     CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
  89     CC_FLAGS_EXPOLINE += -mfunction-return=thunk
  90   endif
  91   CC_FLAGS_EXPOLINE += -mindirect-branch-table
  92   export CC_FLAGS_EXPOLINE
  93   cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
  94   aflags-y += -DCC_USING_EXPOLINE
  95 endif
  96
  97 ifdef CONFIG_FUNCTION_TRACER
  98   ifeq ($(call cc-option,-mfentry -mnop-mcount),)
  99     # make use of hotpatch feature if the compiler supports it
 100     cc_hotpatch := -mhotpatch=0,3
 101     ifneq ($(call cc-option,$(cc_hotpatch)),)
 102       CC_FLAGS_FTRACE := $(cc_hotpatch)
 103       KBUILD_AFLAGS     += -DCC_USING_HOTPATCH
 104       KBUILD_CFLAGS     += -DCC_USING_HOTPATCH
 105     endif
 106   endif
 107 endif
 108
 109 # Test CFI features of binutils
 110 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
 111
 112 KBUILD_CFLAGS   += -mpacked-stack -mbackchain -msoft-float $(cflags-y)
 113 KBUILD_CFLAGS   += -pipe -Wno-sign-compare
 114 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables $(cfi)
 115 KBUILD_AFLAGS   += $(aflags-y) $(cfi)
 116 export KBUILD_AFLAGS_DECOMPRESSOR
 117 export KBUILD_CFLAGS_DECOMPRESSOR
 118
 119 OBJCOPYFLAGS    := -O binary
 120
 121 libs-y          += arch/s390/lib/
 122
 123 boot            := arch/s390/boot
 124 syscalls        := arch/s390/kernel/syscalls
 125 tools           := arch/s390/tools
 126
 127 all: bzImage
 128
 129 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
 130 KBUILD_IMAGE    := $(boot)/bzImage
 131
 132 install:
 133         $(call cmd,install)
 134
 135 bzImage: vmlinux
 136         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 137
 138 zfcpdump:
 139         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 140
 141 vdso_install:
 142         $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
 143
 144 archheaders:
 145         $(Q)$(MAKE) $(build)=$(syscalls) uapi
 146
 147 archprepare:
 148         $(Q)$(MAKE) $(build)=$(syscalls) kapi
 149         $(Q)$(MAKE) $(build)=$(tools) kapi
 150 ifeq ($(KBUILD_EXTMOD),)
 151 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 152 # In order to do that, we should use the archprepare target, but we can't since
 153 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 154 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 155 # Therefore we need to generate the header after prepare0 has been made, hence
 156 # this hack.
 157 prepare: vdso_prepare
 158 vdso_prepare: prepare0
 159         $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
 160         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 161                 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
 162
 163 ifdef CONFIG_EXPOLINE_EXTERN
 164 modules_prepare: expoline_prepare
 165 expoline_prepare: scripts
 166         $(Q)$(MAKE) $(build)=arch/s390/lib/expoline arch/s390/lib/expoline/expoline.o
 167 endif
 168 endif
 169
 170 # Don't use tabs in echo arguments
 171 define archhelp
 172   echo  '* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
 173   echo  '  install         - Install kernel using'
 174   echo  '                    (your) ~/bin/$(INSTALLKERNEL) or'
 175   echo  '                    (distribution) /sbin/$(INSTALLKERNEL) or'
 176   echo  '                    install to $$(INSTALL_PATH)'
 177 endef