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
 11LD_BFD		:= elf64-s390
 12KBUILD_LDFLAGS	:= -m elf64_s390
 13KBUILD_AFLAGS_MODULE += -fPIC
 14KBUILD_CFLAGS_MODULE += -fPIC
 15KBUILD_AFLAGS	+= -m64
 16KBUILD_CFLAGS	+= -m64
 17KBUILD_CFLAGS	+= -fPIC
 18LDFLAGS_vmlinux	:= $(call ld-option,-no-pie)
 19extra_tools	:= relocs
 20aflags_dwarf	:= -Wa,-gdwarf-2
 21KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
 22ifndef CONFIG_AS_IS_LLVM
 23KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
 24endif
 25KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack -std=gnu11 -fms-extensions
 26KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
 27KBUILD_CFLAGS_DECOMPRESSOR += -D__DECOMPRESSOR
 28KBUILD_CFLAGS_DECOMPRESSOR += -Wno-pointer-sign
 29KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
 30KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
 31KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
 32KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
 33KBUILD_CFLAGS_DECOMPRESSOR += -fPIE
 34KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
 35KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
 36KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
 37KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)
 38KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_IS_CLANG),-Wno-microsoft-anon-tag)
 39
 40UTS_MACHINE	:= s390x
 41STACK_SIZE	:= $(if $(CONFIG_KASAN),65536,$(if $(CONFIG_KMSAN),65536,16384))
 42CHECKFLAGS	+= -D__s390__ -D__s390x__
 43
 44export LD_BFD
 45
 46mflags-$(CONFIG_MARCH_Z10)    := -march=z10
 47mflags-$(CONFIG_MARCH_Z196)   := -march=z196
 48mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
 49mflags-$(CONFIG_MARCH_Z13)    := -march=z13
 50mflags-$(CONFIG_MARCH_Z14)    := -march=z14
 51mflags-$(CONFIG_MARCH_Z15)    := -march=z15
 52mflags-$(CONFIG_MARCH_Z16)    := -march=z16
 53mflags-$(CONFIG_MARCH_Z17)    := -march=z17
 54
 55export CC_FLAGS_MARCH := $(mflags-y)
 56
 57aflags-y += $(mflags-y)
 58cflags-y += $(mflags-y)
 59
 60cflags-$(CONFIG_MARCH_Z10_TUNE)		+= -mtune=z10
 61cflags-$(CONFIG_MARCH_Z196_TUNE)	+= -mtune=z196
 62cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12
 63cflags-$(CONFIG_MARCH_Z13_TUNE)		+= -mtune=z13
 64cflags-$(CONFIG_MARCH_Z14_TUNE)		+= -mtune=z14
 65cflags-$(CONFIG_MARCH_Z15_TUNE)		+= -mtune=z15
 66cflags-$(CONFIG_MARCH_Z16_TUNE)		+= -mtune=z16
 67cflags-$(CONFIG_MARCH_Z17_TUNE)		+= -mtune=z17
 68
 69cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
 70
 71#
 72# Prevent tail-call optimizations, to get clearer backtraces:
 73#
 74cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
 75
 76KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
 77KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
 78
 79ifdef CONFIG_EXPOLINE
 80  ifdef CONFIG_EXPOLINE_EXTERN
 81    CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
 82    CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
 83  else
 84    CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
 85    CC_FLAGS_EXPOLINE += -mfunction-return=thunk
 86  endif
 87  CC_FLAGS_EXPOLINE += -mindirect-branch-table
 88  export CC_FLAGS_EXPOLINE
 89  cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
 90  aflags-y += -DCC_USING_EXPOLINE
 91endif
 92
 93ifeq ($(CONFIG_STACKPROTECTOR),y)
 94  KBUILD_CFLAGS += -mstack-protector-guard=global -mstack-protector-guard-record
 95endif
 96
 97ifdef 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
107endif
108
109# Test CFI features of binutils
110cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
111
112KBUILD_CFLAGS	+= -mpacked-stack -mbackchain -msoft-float $(cflags-y)
113KBUILD_CFLAGS	+= -pipe -Wno-sign-compare
114KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables $(cfi)
115KBUILD_AFLAGS	+= $(aflags-y) $(cfi)
116export KBUILD_AFLAGS_DECOMPRESSOR
117export KBUILD_CFLAGS_DECOMPRESSOR
118
119OBJCOPYFLAGS	:= -O binary
120
121libs-y		+= arch/s390/lib/
122
123boot		:= arch/s390/boot
124syscalls	:= arch/s390/kernel/syscalls
125tools		:= arch/s390/tools
126
127all: bzImage
128
129#KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
130KBUILD_IMAGE	:= $(boot)/bzImage
131
132install:
133	$(call cmd,install)
134
135bzImage: vmlinux
136	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
137
138zfcpdump:
139	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
140
141archheaders:
142	$(Q)$(MAKE) $(build)=$(syscalls) all
143
144archprepare:
145	$(Q)$(MAKE) $(build)=$(tools) kapi $(extra_tools)
146ifeq ($(KBUILD_EXTMOD),)
147# We need to generate vdso-offsets.h before compiling certain files in kernel/.
148# In order to do that, we should use the archprepare target, but we can't since
149# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
150# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
151# Therefore we need to generate the header after prepare0 has been made, hence
152# this hack.
153prepare: vdso_prepare
154vdso_prepare: prepare0
155	$(Q)$(MAKE) $(build)=arch/s390/kernel/vdso include/generated/vdso-offsets.h
156
157vdso-install-y			+= arch/s390/kernel/vdso/vdso.so.dbg
158
159endif
160
161# Don't use tabs in echo arguments
162define archhelp
163  echo	'* bzImage         - Kernel image for IPL ($(boot)/bzImage)'
164  echo	'  install         - Install kernel using'
165  echo	'                    (your) ~/bin/$(INSTALLKERNEL) or'
166  echo	'                    (distribution) /sbin/$(INSTALLKERNEL) or'
167  echo	'                    install to $$(INSTALL_PATH)'
168endef