[RFC,13/47] lkl: plug in the build system
diff mbox series

Message ID fbc2a747dbfe5520828aabc5d0a7f190455b9d9c.1571798507.git.thehajime@gmail.com
State New
Headers show
Series
  • [RFC,01/47] asm-generic: atomic64: allow using generic atomic64 on 64bit platforms
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Commit Message

Hajime Tazaki Oct. 23, 2019, 4:37 a.m. UTC
From: Octavian Purdila <tavi.purdila@gmail.com>

Basic Makefiles for building LKL. Add a new architecture specific
target for installing the resulting library files and headers.

Signed-off-by: Octavian Purdila <tavi.purdila@gmail.com>
---
 arch/um/Makefile.um         | 117 ++++++++++++++++++++++++++++++++++++
 arch/um/lkl/auto.conf       |   1 +
 arch/um/lkl/kernel/Makefile |   4 ++
 arch/um/lkl/mm/Makefile     |   1 +
 4 files changed, 123 insertions(+)
 create mode 100644 arch/um/Makefile.um
 create mode 100644 arch/um/lkl/auto.conf
 create mode 100644 arch/um/lkl/kernel/Makefile
 create mode 100644 arch/um/lkl/mm/Makefile

Patch
diff mbox series

diff --git a/arch/um/Makefile.um b/arch/um/Makefile.um
new file mode 100644
index 000000000000..24a088e5df04
--- /dev/null
+++ b/arch/um/Makefile.um
@@ -0,0 +1,117 @@ 
+# SPDX-License-Identifier: GPL-2.0
+#
+# 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
+#
+
+core-y			+= $(ARCH_DIR)/kernel/		\
+			 $(ARCH_DIR)/drivers/		\
+			 $(ARCH_DIR)/os-$(OS)/
+
+ifdef CONFIG_64BIT
+	KBUILD_CFLAGS += -mcmodel=large
+endif
+
+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 $(obj)/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
+
+archclean:
+	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
+		-o -name '*.gcov' \) -type f -print | xargs rm -f
+
+export USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
diff --git a/arch/um/lkl/auto.conf b/arch/um/lkl/auto.conf
new file mode 100644
index 000000000000..4bfd65a02d73
--- /dev/null
+++ b/arch/um/lkl/auto.conf
@@ -0,0 +1 @@ 
+export OUTPUT_FORMAT=$(shell $(LD) -r -print-output-format)
diff --git a/arch/um/lkl/kernel/Makefile b/arch/um/lkl/kernel/Makefile
new file mode 100644
index 000000000000..ef489f2f7176
--- /dev/null
+++ b/arch/um/lkl/kernel/Makefile
@@ -0,0 +1,4 @@ 
+extra-y := vmlinux.lds
+
+obj-y = setup.o threads.o irq.o time.o syscalls.o misc.o console.o \
+	syscalls_32.o cpu.o
diff --git a/arch/um/lkl/mm/Makefile b/arch/um/lkl/mm/Makefile
new file mode 100644
index 000000000000..2af6e3051897
--- /dev/null
+++ b/arch/um/lkl/mm/Makefile
@@ -0,0 +1 @@ 
+obj-y = bootmem.o