# SPDX-License-Identifier: GPL-2.0

  #
  # s390/Makefile
  #
  # This file is included by the global makefile so that you can add your own
  # architecture-specific flags and dependencies. Remember to do have actions
  # for "archclean" and "archdep" for cleaning up and making dependencies for
  # this architecture
  #

  # Copyright (C) 1994 by Linus Torvalds
  #

  LD_BFD		:= elf64-s390

  KBUILD_LDFLAGS	:= -m elf64_s390

  KBUILD_AFLAGS_MODULE += -fPIC
  KBUILD_CFLAGS_MODULE += -fPIC

  KBUILD_AFLAGS	+= -m64

  KBUILD_CFLAGS	+= -m64

  ifeq ($(CONFIG_RELOCATABLE),y)
  KBUILD_CFLAGS	+= -fPIE
  LDFLAGS_vmlinux	:= -pie
  endif

  aflags_dwarf	:= -Wa,-gdwarf-2

  KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__

  KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))

  KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2

  KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
  KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float
  KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
  KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-option,-ffreestanding)

  KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)

  KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
  KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))

  UTS_MACHINE	:= s390x

  STACK_SIZE	:= $(if $(CONFIG_KASAN),65536,16384)

  CHECKFLAGS	+= -D__s390__ -D__s390x__

  export LD_BFD

  mflags-$(CONFIG_MARCH_Z900)   := -march=z900
  mflags-$(CONFIG_MARCH_Z990)   := -march=z990
  mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
  mflags-$(CONFIG_MARCH_Z10)    := -march=z10
  mflags-$(CONFIG_MARCH_Z196)   := -march=z196
  mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12

  mflags-$(CONFIG_MARCH_Z13)    := -march=z13
  mflags-$(CONFIG_MARCH_Z14)    := -march=z14

  mflags-$(CONFIG_MARCH_Z15)    := -march=z15

  export CC_FLAGS_MARCH := $(mflags-y)

  aflags-y += $(mflags-y)
  cflags-y += $(mflags-y)

  cflags-$(CONFIG_MARCH_Z900_TUNE)	+= -mtune=z900
  cflags-$(CONFIG_MARCH_Z990_TUNE)	+= -mtune=z990
  cflags-$(CONFIG_MARCH_Z9_109_TUNE)	+= -mtune=z9-109
  cflags-$(CONFIG_MARCH_Z10_TUNE)		+= -mtune=z10
  cflags-$(CONFIG_MARCH_Z196_TUNE)	+= -mtune=z196
  cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12

  cflags-$(CONFIG_MARCH_Z13_TUNE)		+= -mtune=z13
  cflags-$(CONFIG_MARCH_Z14_TUNE)		+= -mtune=z14

  cflags-$(CONFIG_MARCH_Z15_TUNE)		+= -mtune=z15

  cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include

  #
  # Prevent tail-call optimizations, to get clearer backtraces:
  #
  cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls

  ifeq ($(call cc-option-yn,-mpacked-stack -mbackchain -msoft-float),y)

  cflags-$(CONFIG_PACK_STACK)  += -mpacked-stack -D__PACK_STACK
  aflags-$(CONFIG_PACK_STACK)  += -D__PACK_STACK

  endif

  KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
  KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)

  ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)
  cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)

  ifneq ($(call cc-option-yn,-mstack-size=8192),y)

  cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
  endif

  endif

  ifdef CONFIG_WARN_DYNAMIC_STACK
    ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
      KBUILD_CFLAGS += -mwarn-dynamicstack
      KBUILD_CFLAGS_DECOMPRESSOR += -mwarn-dynamicstack
    endif

  endif

  ifdef CONFIG_EXPOLINE
    ifeq ($(call cc-option-yn,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),y)
      CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
      CC_FLAGS_EXPOLINE += -mfunction-return=thunk
      CC_FLAGS_EXPOLINE += -mindirect-branch-table
      export CC_FLAGS_EXPOLINE

      cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE

      aflags-y += -DCC_USING_EXPOLINE

    endif
  endif

  ifdef CONFIG_FUNCTION_TRACER

    ifeq ($(call cc-option-yn,-mfentry -mnop-mcount),n)
      # make use of hotpatch feature if the compiler supports it
      cc_hotpatch	:= -mhotpatch=0,3
      ifeq ($(call cc-option-yn,$(cc_hotpatch)),y)
        CC_FLAGS_FTRACE := $(cc_hotpatch)
        KBUILD_AFLAGS	+= -DCC_USING_HOTPATCH
        KBUILD_CFLAGS	+= -DCC_USING_HOTPATCH
      endif
    endif

  endif

  # Test CFI features of binutils
  cfi := $(call as-instr,.cfi_startproc
  .cfi_val_offset 15$(comma)-160
  .cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)

  KBUILD_CFLAGS	+= -mbackchain -msoft-float $(cflags-y)

  KBUILD_CFLAGS	+= -pipe -Wno-sign-compare

  KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables $(cfi)
  KBUILD_AFLAGS	+= $(aflags-y) $(cfi)

  export KBUILD_AFLAGS_DECOMPRESSOR
  export KBUILD_CFLAGS_DECOMPRESSOR

  
  OBJCOPYFLAGS	:= -O binary

  head-y		:= arch/s390/kernel/head64.o

  # See arch/s390/Kbuild for content of core part of the kernel
  core-y		+= arch/s390/

  libs-y		+= arch/s390/lib/

  drivers-y	+= drivers/s390/

  
  # must be linked after kernel
  drivers-$(CONFIG_OPROFILE)	+= arch/s390/oprofile/

  boot		:= arch/s390/boot

  syscalls	:= arch/s390/kernel/syscalls

  tools		:= arch/s390/tools

  all: bzImage

  #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
  KBUILD_IMAGE	:= $(boot)/bzImage

  install: vmlinux
  	$(Q)$(MAKE) $(build)=$(boot) $@

  bzImage: vmlinux

  	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

  zfcpdump:
  	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

  vdso_install:

  	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@

  	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@

  archclean:
  	$(Q)$(MAKE) $(clean)=$(boot)

  	$(Q)$(MAKE) $(clean)=$(tools)

  archheaders:
  	$(Q)$(MAKE) $(build)=$(syscalls) uapi

  archprepare:

  	$(Q)$(MAKE) $(build)=$(syscalls) kapi

  	$(Q)$(MAKE) $(build)=$(tools) kapi

  # Don't use tabs in echo arguments
  define archhelp

    echo	'* bzImage         - Kernel image for IPL ($(boot)/bzImage)'

    echo	'  install         - Install kernel using'
    echo	'                    (your) ~/bin/$(INSTALLKERNEL) or'
    echo	'                    (distribution) /sbin/$(INSTALLKERNEL) or'
    echo	'                    install to $$(INSTALL_PATH)'

  endef