diff options
Diffstat (limited to 'arch/um/Makefile')
| -rw-r--r-- | arch/um/Makefile | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/arch/um/Makefile b/arch/um/Makefile new file mode 100644 index 0000000000..82f05f2506 --- /dev/null +++ b/arch/um/Makefile @@ -0,0 +1,153 @@ +# +# 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 := $(SUBARCH)_defconfig +endif + +ARCH_DIR := arch/um +# We require bash because the vmlinux link and loader script cpp use bash +# features. +SHELL := /bin/bash + +MODE_INCLUDE += -I$(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 $(srctree)/$(ARCH_DIR)/Makefile-skas +include $(srctree)/$(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_RUSTFLAGS += -Crelocation-model=pie + +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 $(srctree)/$(ARCH_DIR)/Makefile-os-Linux + +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) += $(call cc-option, -no-pie) +LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib + +CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \ + -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 := $(ELF_FORMAT) + +# The wrappers will select whether using "malloc" or the kernel allocator. +LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc + +# Avoid binutils 2.39+ warnings by marking the stack non-executable and +# ignorning warnings for the kallsyms sections. +LDFLAGS_EXECSTACK = -z noexecstack +ifeq ($(CONFIG_LD_IS_BFD),y) +LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments) +endif + +LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt)) + +# Used by link-vmlinux.sh which has special support for um link +export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO) + +# 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_FILES += $(HOST_DIR)/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 DEV_NULL_PATH |