1#
2# This file is included by the global makefile so that you can add your own
3# architecture-specific flags and dependencies.
4#
5# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
6# Licensed under the GPL
7#
8
9# select defconfig based on actual architecture
10ifeq ($(SUBARCH),x86)
11  ifeq ($(shell uname -m),x86_64)
12        KBUILD_DEFCONFIG := x86_64_defconfig
13  else
14        KBUILD_DEFCONFIG := i386_defconfig
15  endif
16else
17        KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
18endif
19
20ARCH_DIR := arch/um
21# We require bash because the vmlinux link and loader script cpp use bash
22# features.
23SHELL := /bin/bash
24
25MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas
26
27HEADER_ARCH 	:= $(SUBARCH)
28
29ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
30	HEADER_ARCH := x86
31endif
32
33ifdef CONFIG_64BIT
34	KBUILD_CFLAGS += -mcmodel=large
35endif
36
37HOST_DIR := arch/$(HEADER_ARCH)
38
39include $(srctree)/$(ARCH_DIR)/Makefile-skas
40include $(srctree)/$(HOST_DIR)/Makefile.um
41
42core-y += $(HOST_DIR)/um/
43
44SHARED_HEADERS	:= $(ARCH_DIR)/include/shared
45ARCH_INCLUDE	:= -I$(srctree)/$(SHARED_HEADERS)
46ARCH_INCLUDE	+= -I$(srctree)/$(HOST_DIR)/um/shared
47KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
48
49# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
50# named - it's a common symbol in libpcap, so we get a binary which crashes.
51#
52# Same things for in6addr_loopback and mktime - found in libc. For these two we
53# only get link-time error, luckily.
54#
55# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
56# embedded copy of longjmp, same thing for setjmp.
57#
58# These apply to USER_CFLAGS to.
59
60KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
61	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
62	-Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
63	-Din6addr_loopback=kernel_in6addr_loopback \
64	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
65
66KBUILD_RUSTFLAGS += -Crelocation-model=pie
67
68KBUILD_AFLAGS += $(ARCH_INCLUDE)
69
70USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
71		$(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
72		-D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
73		-idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
74
75#This will adjust *FLAGS accordingly to the platform.
76include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux
77
78KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
79		   -I$(srctree)/$(HOST_DIR)/include/uapi \
80		   -I$(objtree)/$(HOST_DIR)/include/generated \
81		   -I$(objtree)/$(HOST_DIR)/include/generated/uapi
82
83# -Derrno=kernel_errno - This turns all kernel references to errno into
84# kernel_errno to separate them from the libc errno.  This allows -fno-common
85# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
86# errnos.
87# These apply to kernelspace only.
88#
89# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
90# defines more robust
91
92KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
93			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
94KBUILD_CFLAGS += $(KERNEL_DEFINES)
95
96PHONY += linux
97
98all: linux
99
100linux: vmlinux
101	@echo '  LINK $@'
102	$(Q)ln -f $< $@
103
104define archhelp
105  echo '* linux		- Binary kernel image (./linux) - for backward'
106  echo '		   compatibility only, this creates a hard link to the'
107  echo '		   real kernel binary, the "vmlinux" binary you'
108  echo '		   find in the kernel root.'
109endef
110
111archheaders:
112	$(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
113
114archprepare:
115	$(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
116
117LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
118ifdef CONFIG_LD_SCRIPT_DYN
119LINK-$(call gcc-min-version, 60100)$(CONFIG_CC_IS_CLANG) += -no-pie
120endif
121LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib
122
123CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
124	-fno-stack-protector $(call cc-option, -fno-stack-protector-all)
125
126# Options used by linker script
127export LDS_START      := $(START)
128export LDS_ELF_ARCH   := $(ELF_ARCH)
129export LDS_ELF_FORMAT := $(ELF_FORMAT)
130
131# The wrappers will select whether using "malloc" or the kernel allocator.
132LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
133
134# Avoid binutils 2.39+ warnings by marking the stack non-executable and
135# ignorning warnings for the kallsyms sections.
136LDFLAGS_EXECSTACK = -z noexecstack
137ifeq ($(CONFIG_LD_IS_BFD),y)
138LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
139endif
140
141LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt))
142
143# Used by link-vmlinux.sh which has special support for um link
144export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO)
145
146# When cleaning we don't include .config, so we don't include
147# TT or skas makefiles and don't clean skas_ptregs.h.
148CLEAN_FILES += linux x.i gmon.out
149MRPROPER_FILES += $(HOST_DIR)/include/generated
150
151archclean:
152	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
153		-o -name '*.gcov' \) -type f -print | xargs rm -f
154
155export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH
156