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Dir : ~/usr/lib/modules/5.4.0-124-generic/build/arch/um/

Edit File: Makefile

#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies.
#
# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
# Licensed under the GPL
#

# select defconfig based on actual architecture
ifeq ($(SUBARCH),x86)
  ifeq ($(shell uname -m),x86_64)
        KBUILD_DEFCONFIG := x86_64_defconfig
  else
        KBUILD_DEFCONFIG := i386_defconfig
  endif
else
        KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
endif

ARCH_DIR := arch/um
OS := $(shell uname -s)
# We require bash because the vmlinux link and loader script cpp use bash
# features.
SHELL := /bin/bash

core-y			+= $(ARCH_DIR)/kernel/		\
			   $(ARCH_DIR)/drivers/		\
			   $(ARCH_DIR)/os-$(OS)/

MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas

HEADER_ARCH 	:= $(SUBARCH)

ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
	HEADER_ARCH := x86
endif

ifdef CONFIG_64BIT
	KBUILD_CFLAGS += -mcmodel=large
endif

HOST_DIR := arch/$(HEADER_ARCH)

include $(ARCH_DIR)/Makefile-skas
include $(HOST_DIR)/Makefile.um

core-y += $(HOST_DIR)/um/

SHARED_HEADERS	:= $(ARCH_DIR)/include/shared
ARCH_INCLUDE	:= -I$(srctree)/$(SHARED_HEADERS)
ARCH_INCLUDE	+= -I$(srctree)/$(HOST_DIR)/um/shared
KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um

# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
# named - it's a common symbol in libpcap, so we get a binary which crashes.
#
# Same things for in6addr_loopback and mktime - found in libc. For these two we
# only get link-time error, luckily.
#
# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
# embedded copy of longjmp, same thing for setjmp.
#
# These apply to USER_CFLAGS to.

KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
	-Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
	-Din6addr_loopback=kernel_in6addr_loopback \
	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr

KBUILD_AFLAGS += $(ARCH_INCLUDE)

USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
		$(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
		-D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
		-idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__

#This will adjust *FLAGS accordingly to the platform.
include $(ARCH_DIR)/Makefile-os-$(OS)

KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
		   -I$(srctree)/$(HOST_DIR)/include/uapi \
		   -I$(objtree)/$(HOST_DIR)/include/generated \
		   -I$(objtree)/$(HOST_DIR)/include/generated/uapi

# -Derrno=kernel_errno - This turns all kernel references to errno into
# kernel_errno to separate them from the libc errno.  This allows -fno-common
# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
# errnos.
# These apply to kernelspace only.
#
# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
# defines more robust

KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
KBUILD_CFLAGS += $(KERNEL_DEFINES)

PHONY += linux

all: linux

linux: vmlinux
	@echo '  LINK $@'
	$(Q)ln -f $< $@

define archhelp
  echo '* linux		- Binary kernel image (./linux) - for backward'
  echo '		   compatibility only, this creates a hard link to the'
  echo '		   real kernel binary, the "vmlinux" binary you'
  echo '		   find in the kernel root.'
endef

archheaders:
	$(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders

archprepare:
	$(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h

LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib $(call cc-option, -no-pie)

CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
	$(call cc-option, -fno-stack-protector,) \
	$(call cc-option, -fno-stack-protector-all,)

# Options used by linker script
export LDS_START      := $(START)
export LDS_ELF_ARCH   := $(ELF_ARCH)
export LDS_ELF_FORMAT := $(ELF_FORMAT)

# The wrappers will select whether using "malloc" or the kernel allocator.
LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc

LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))

# Used by link-vmlinux.sh which has special support for um link
export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)

# When cleaning we don't include .config, so we don't include
# TT or skas makefiles and don't clean skas_ptregs.h.
CLEAN_FILES += linux x.i gmon.out
MRPROPER_DIRS += arch/$(SUBARCH)/include/generated

archclean:
	@find . $ -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
		-o -name '*.gcov' $ -type f -print | xargs rm -f

export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH