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