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 ifdef CONFIG_PIE_BUILD
  18 KBUILD_CFLAGS   += -fPIE
  19 LDFLAGS_vmlinux := -pie -z notext
  20 else
  21 KBUILD_CFLAGS   += $(call cc-option,-munaligned-symbols,)
  22 LDFLAGS_vmlinux := --emit-relocs --discard-none
  23 extra_tools     := relocs
  24 endif
  25 aflags_dwarf    := -Wa,-gdwarf-2
  26 KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
  27 ifndef CONFIG_AS_IS_LLVM
  28 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
  29 endif
  30 KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
  31 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
  32 KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
  33 KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
  34 KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
  35 KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
  36 KBUILD_CFLAGS_DECOMPRESSOR += -fPIE
  37 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
  38 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
  39 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
  40 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)
  41
  42 UTS_MACHINE     := s390x
  43 STACK_SIZE      := $(if $(CONFIG_KASAN),65536,16384)
  44 CHECKFLAGS      += -D__s390__ -D__s390x__
  45
  46 export LD_BFD
  47
  48 mflags-$(CONFIG_MARCH_Z10)    := -march=z10
  49 mflags-$(CONFIG_MARCH_Z196)   := -march=z196
  50 mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
  51 mflags-$(CONFIG_MARCH_Z13)    := -march=z13
  52 mflags-$(CONFIG_MARCH_Z14)    := -march=z14
  53 mflags-$(CONFIG_MARCH_Z15)    := -march=z15
  54 mflags-$(CONFIG_MARCH_Z16)    := -march=z16
  55
  56 export CC_FLAGS_MARCH := $(mflags-y)
  57
  58 aflags-y += $(mflags-y)
  59 cflags-y += $(mflags-y)
  60
  61 cflags-$(CONFIG_MARCH_Z10_TUNE)         += -mtune=z10
  62 cflags-$(CONFIG_MARCH_Z196_TUNE)        += -mtune=z196
  63 cflags-$(CONFIG_MARCH_ZEC12_TUNE)       += -mtune=zEC12
  64 cflags-$(CONFIG_MARCH_Z13_TUNE)         += -mtune=z13
  65 cflags-$(CONFIG_MARCH_Z14_TUNE)         += -mtune=z14
  66 cflags-$(CONFIG_MARCH_Z15_TUNE)         += -mtune=z15
  67 cflags-$(CONFIG_MARCH_Z16_TUNE)         += -mtune=z16
  68
  69 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
  70
  71 #
  72 # Prevent tail-call optimizations, to get clearer backtraces:
  73 #
  74 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
  75
  76 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
  77 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
  78
  79 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
  80   CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
  81   ifeq ($(call cc-option,-mstack-size=8192),)
  82     CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
  83   endif
  84   export CC_FLAGS_CHECK_STACK
  85   cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
  86 endif
  87
  88 ifdef CONFIG_EXPOLINE
  89   ifdef CONFIG_EXPOLINE_EXTERN
  90     KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline/expoline.o
  91     CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
  92     CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
  93   else
  94     CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
  95     CC_FLAGS_EXPOLINE += -mfunction-return=thunk
  96   endif
  97   CC_FLAGS_EXPOLINE += -mindirect-branch-table
  98   export CC_FLAGS_EXPOLINE
  99   cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
 100   aflags-y += -DCC_USING_EXPOLINE
 101 endif
 102
 103 ifdef CONFIG_FUNCTION_TRACER
 104   ifeq ($(call cc-option,-mfentry -mnop-mcount),)
 105     # make use of hotpatch feature if the compiler supports it
 106     cc_hotpatch := -mhotpatch=0,3
 107     ifneq ($(call cc-option,$(cc_hotpatch)),)
 108       CC_FLAGS_FTRACE := $(cc_hotpatch)
 109       KBUILD_AFLAGS     += -DCC_USING_HOTPATCH
 110       KBUILD_CFLAGS     += -DCC_USING_HOTPATCH
 111     endif
 112   endif
 113 endif
 114
 115 # Test CFI features of binutils
 116 cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
 117
 118 KBUILD_CFLAGS   += -mpacked-stack -mbackchain -msoft-float $(cflags-y)
 119 KBUILD_CFLAGS   += -pipe -Wno-sign-compare
 120 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables $(cfi)
 121 KBUILD_AFLAGS   += $(aflags-y) $(cfi)
 122 export KBUILD_AFLAGS_DECOMPRESSOR
 123 export KBUILD_CFLAGS_DECOMPRESSOR
 124
 125 OBJCOPYFLAGS    := -O binary
 126
 127 libs-y          += arch/s390/lib/
 128
 129 boot            := arch/s390/boot
 130 syscalls        := arch/s390/kernel/syscalls
 131 tools           := arch/s390/tools
 132
 133 all: bzImage
 134
 135 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
 136 KBUILD_IMAGE    := $(boot)/bzImage
 137
 138 install:
 139         $(call cmd,install)
 140
 141 bzImage: vmlinux
 142         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 143
 144 zfcpdump:
 145         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 146
 147 archheaders:
 148         $(Q)$(MAKE) $(build)=$(syscalls) uapi
 149
 150 archprepare:
 151         $(Q)$(MAKE) $(build)=$(syscalls) kapi
 152         $(Q)$(MAKE) $(build)=$(tools) kapi $(extra_tools)
 153 ifeq ($(KBUILD_EXTMOD),)
 154 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 155 # In order to do that, we should use the archprepare target, but we can't since
 156 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 157 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 158 # Therefore we need to generate the header after prepare0 has been made, hence
 159 # this hack.
 160 prepare: vdso_prepare
 161 vdso_prepare: prepare0
 162         $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
 163         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 164                 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
 165
 166 vdso-install-y                  += arch/s390/kernel/vdso64/vdso64.so.dbg
 167 vdso-install-$(CONFIG_COMPAT)   += arch/s390/kernel/vdso32/vdso32.so.dbg
 168
 169 ifdef CONFIG_EXPOLINE_EXTERN
 170 modules_prepare: expoline_prepare
 171 expoline_prepare: scripts
 172         $(Q)$(MAKE) $(build)=arch/s390/lib/expoline arch/s390/lib/expoline/expoline.o
 173 endif
 174 endif
 175
 176 # Don't use tabs in echo arguments
 177 define archhelp
 178   echo  '* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
 179   echo  '  install         - Install kernel using'
 180   echo  '                    (your) ~/bin/$(INSTALLKERNEL) or'
 181   echo  '                    (distribution) /sbin/$(INSTALLKERNEL) or'
 182   echo  '                    install to $$(INSTALL_PATH)'
 183 endef