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   += -fPIC
  18 LDFLAGS_vmlinux := -no-pie --emit-relocs --discard-none
  19 extra_tools     := relocs
  20 aflags_dwarf    := -Wa,-gdwarf-2
  21 KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
  22 ifndef CONFIG_AS_IS_LLVM
  23 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
  24 endif
  25 KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
  26 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
  27 KBUILD_CFLAGS_DECOMPRESSOR += -D__DECOMPRESSOR
  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 += -fPIE
  33 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
  34 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
  35 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
  36 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)
  37
  38 UTS_MACHINE     := s390x
  39 STACK_SIZE      := $(if $(CONFIG_KASAN),65536,$(if $(CONFIG_KMSAN),65536,16384))
  40 CHECKFLAGS      += -D__s390__ -D__s390x__
  41
  42 export LD_BFD
  43
  44 mflags-$(CONFIG_MARCH_Z10)    := -march=z10
  45 mflags-$(CONFIG_MARCH_Z196)   := -march=z196
  46 mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
  47 mflags-$(CONFIG_MARCH_Z13)    := -march=z13
  48 mflags-$(CONFIG_MARCH_Z14)    := -march=z14
  49 mflags-$(CONFIG_MARCH_Z15)    := -march=z15
  50 mflags-$(CONFIG_MARCH_Z16)    := -march=z16
  51
  52 export CC_FLAGS_MARCH := $(mflags-y)
  53
  54 aflags-y += $(mflags-y)
  55 cflags-y += $(mflags-y)
  56
  57 cflags-$(CONFIG_MARCH_Z10_TUNE)         += -mtune=z10
  58 cflags-$(CONFIG_MARCH_Z196_TUNE)        += -mtune=z196
  59 cflags-$(CONFIG_MARCH_ZEC12_TUNE)       += -mtune=zEC12
  60 cflags-$(CONFIG_MARCH_Z13_TUNE)         += -mtune=z13
  61 cflags-$(CONFIG_MARCH_Z14_TUNE)         += -mtune=z14
  62 cflags-$(CONFIG_MARCH_Z15_TUNE)         += -mtune=z15
  63 cflags-$(CONFIG_MARCH_Z16_TUNE)         += -mtune=z16
  64
  65 cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
  66
  67 #
  68 # Prevent tail-call optimizations, to get clearer backtraces:
  69 #
  70 cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
  71
  72 KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
  73 KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
  74
  75 ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
  76   CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE)
  77   ifeq ($(call cc-option,-mstack-size=8192),)
  78     CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD)
  79   endif
  80   export CC_FLAGS_CHECK_STACK
  81   cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK)
  82 endif
  83
  84 ifdef CONFIG_EXPOLINE
  85   ifdef CONFIG_EXPOLINE_EXTERN
  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 libs-y          += arch/s390/lib/
 123
 124 boot            := arch/s390/boot
 125 syscalls        := arch/s390/kernel/syscalls
 126 tools           := arch/s390/tools
 127
 128 all: bzImage
 129
 130 #KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
 131 KBUILD_IMAGE    := $(boot)/bzImage
 132
 133 install:
 134         $(call cmd,install)
 135
 136 bzImage: vmlinux
 137         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 138
 139 zfcpdump:
 140         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 141
 142 archheaders:
 143         $(Q)$(MAKE) $(build)=$(syscalls) uapi
 144
 145 archprepare:
 146         $(Q)$(MAKE) $(build)=$(syscalls) kapi
 147         $(Q)$(MAKE) $(build)=$(tools) kapi $(extra_tools)
 148 ifeq ($(KBUILD_EXTMOD),)
 149 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 150 # In order to do that, we should use the archprepare target, but we can't since
 151 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 152 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 153 # Therefore we need to generate the header after prepare0 has been made, hence
 154 # this hack.
 155 prepare: vdso_prepare
 156 vdso_prepare: prepare0
 157         $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
 158         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 159                 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
 160
 161 vdso-install-y                  += arch/s390/kernel/vdso64/vdso64.so.dbg
 162 vdso-install-$(CONFIG_COMPAT)   += arch/s390/kernel/vdso32/vdso32.so.dbg
 163
 164 endif
 165
 166 # Don't use tabs in echo arguments
 167 define archhelp
 168   echo  '* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
 169   echo  '  install         - Install kernel using'
 170   echo  '                    (your) ~/bin/$(INSTALLKERNEL) or'
 171   echo  '                    (distribution) /sbin/$(INSTALLKERNEL) or'
 172   echo  '                    install to $$(INSTALL_PATH)'
 173 endef