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 17ifeq ($(CONFIG_RELOCATABLE),y) 18KBUILD_CFLAGS += -fPIE 19LDFLAGS_vmlinux := -pie 20endif 21aflags_dwarf := -Wa,-gdwarf-2 22KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__ 23ifndef CONFIG_AS_IS_LLVM 24KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf)) 25endif 26KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack 27KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY 28KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain 29KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables 30KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding 31KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector 32KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member) 33KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g) 34KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,)) 35 36ifdef CONFIG_CC_IS_GCC 37 ifeq ($(call cc-ifversion, -ge, 1200, y), y) 38 ifeq ($(call cc-ifversion, -lt, 1300, y), y) 39 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 40 KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds) 41 endif 42 endif 43endif 44 45UTS_MACHINE := s390x 46STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384) 47CHECKFLAGS += -D__s390__ -D__s390x__ 48 49export LD_BFD 50 51mflags-$(CONFIG_MARCH_Z10) := -march=z10 52mflags-$(CONFIG_MARCH_Z196) := -march=z196 53mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12 54mflags-$(CONFIG_MARCH_Z13) := -march=z13 55mflags-$(CONFIG_MARCH_Z14) := -march=z14 56mflags-$(CONFIG_MARCH_Z15) := -march=z15 57mflags-$(CONFIG_MARCH_Z16) := -march=z16 58 59export CC_FLAGS_MARCH := $(mflags-y) 60 61aflags-y += $(mflags-y) 62cflags-y += $(mflags-y) 63 64cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10 65cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196 66cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12 67cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13 68cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14 69cflags-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15 70cflags-$(CONFIG_MARCH_Z16_TUNE) += -mtune=z16 71 72cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include 73 74# 75# Prevent tail-call optimizations, to get clearer backtraces: 76# 77cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls 78 79KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y) 80KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y) 81 82ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),) 83 CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE) 84 ifeq ($(call cc-option,-mstack-size=8192),) 85 CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD) 86 endif 87 export CC_FLAGS_CHECK_STACK 88 cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK) 89endif 90 91ifdef CONFIG_EXPOLINE 92 ifdef CONFIG_EXPOLINE_EXTERN 93 KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline.o 94 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern 95 CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern 96 else 97 CC_FLAGS_EXPOLINE := -mindirect-branch=thunk 98 CC_FLAGS_EXPOLINE += -mfunction-return=thunk 99 endif 100 CC_FLAGS_EXPOLINE += -mindirect-branch-table 101 export CC_FLAGS_EXPOLINE 102 cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE 103 aflags-y += -DCC_USING_EXPOLINE 104endif 105 106ifdef CONFIG_FUNCTION_TRACER 107 ifeq ($(call cc-option,-mfentry -mnop-mcount),) 108 # make use of hotpatch feature if the compiler supports it 109 cc_hotpatch := -mhotpatch=0,3 110 ifneq ($(call cc-option,$(cc_hotpatch)),) 111 CC_FLAGS_FTRACE := $(cc_hotpatch) 112 KBUILD_AFLAGS += -DCC_USING_HOTPATCH 113 KBUILD_CFLAGS += -DCC_USING_HOTPATCH 114 endif 115 endif 116endif 117 118# Test CFI features of binutils 119cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1) 120 121KBUILD_CFLAGS += -mpacked-stack -mbackchain -msoft-float $(cflags-y) 122KBUILD_CFLAGS += -pipe -Wno-sign-compare 123KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi) 124KBUILD_AFLAGS += $(aflags-y) $(cfi) 125export KBUILD_AFLAGS_DECOMPRESSOR 126export KBUILD_CFLAGS_DECOMPRESSOR 127 128OBJCOPYFLAGS := -O binary 129 130head-y := arch/s390/kernel/head64.o 131 132libs-y += arch/s390/lib/ 133drivers-y += drivers/s390/ 134 135boot := arch/s390/boot 136syscalls := arch/s390/kernel/syscalls 137tools := arch/s390/tools 138 139all: bzImage 140 141#KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg... 142KBUILD_IMAGE := $(boot)/bzImage 143 144install: 145 $(call cmd,install) 146 147bzImage: vmlinux 148 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 149 150zfcpdump: 151 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 152 153vdso_install: 154 $(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@ 155 156archheaders: 157 $(Q)$(MAKE) $(build)=$(syscalls) uapi 158 159archprepare: 160 $(Q)$(MAKE) $(build)=$(syscalls) kapi 161 $(Q)$(MAKE) $(build)=$(tools) kapi 162ifeq ($(KBUILD_EXTMOD),) 163# We need to generate vdso-offsets.h before compiling certain files in kernel/. 164# In order to do that, we should use the archprepare target, but we can't since 165# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 166# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 167# Therefore we need to generate the header after prepare0 has been made, hence 168# this hack. 169prepare: vdso_prepare 170vdso_prepare: prepare0 171 $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h 172 $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ 173 $(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h) 174endif 175 176# Don't use tabs in echo arguments 177define archhelp 178 echo '* bzImage - Kernel image for IPL ($(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)' 183endef 184