arch/um/Makefile

Source file repositories/reference/linux-study-clean/arch/um/Makefile

File Facts

System
Linux kernel
Corpus path
arch/um/Makefile
Extension
[no extension]
Size
5185 bytes
Lines
157
Domain
Architecture Layer
Bucket
arch/um
Inferred role
Architecture Layer: build/configuration rule
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#
# 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 := 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

# -Dstrrchr=kernel_strrchr (as well as the various in6addr symbols) prevents
#  anything from referencing
# libc symbols with the same name, which can cause a linker error.
#
# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
# embedded copy of longjmp, same thing for setjmp.
#
# These apply to USER_CFLAGS too.

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

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)) \

Annotation

Implementation Notes