add some basic infrastructure for qemu-system-m68k

Qemu emulates a Coldfire Evaluation board without MMU.
As that is the first non-MMU platform in OpenADK I added
ADK_TARGET_UCLINUX. Mksh can not be used for non-MMU, because
it requires fork() for job control and other things.
We use hush here. non-MMU support in uClibc does not have
shared library support.

Kernel does not start yet. So no runtime testing, but at least
coldfire toolchain can be tested with uClibc-ng.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>

13 files changed, 305 insertions, 5 deletions

diff --git a/target/config/Config.in b/target/config/Config.in
index 5187c9bac..38f8090dd 100644
--- a/target/config/Config.in
+++ b/target/config/Config.in
@@ -14,6 +14,10 @@ config ADK_TOOLCHAIN_ONLY
 config ADK_TARGET_TOOLCHAIN
 	boolean
 
+config ADK_TARGET_UCLINUX
+	select ADK_TARGET_USE_STATIC_LIBS
+	boolean
+
 config ADK_TARGET_QEMU
 	boolean
 
diff --git a/target/config/Config.in.cpu b/target/config/Config.in.cpu
index 3ab984484..ed612b9df 100644
--- a/target/config/Config.in.cpu
+++ b/target/config/Config.in.cpu
@@ -107,6 +107,9 @@ config ADK_CPU_CORTEX_A9
 config ADK_CPU_ARMV8
 	boolean
 
+config ADK_CPU_CF_5208
+	boolean
+
 config ADK_TARGET_CPU_ARCH
 	string
 	default "aarch64" if ADK_LINUX_AARCH64 && ADK_little
diff --git a/target/config/Config.in.kernel b/target/config/Config.in.kernel
index 28d8ef276..94b5dfefb 100644
--- a/target/config/Config.in.kernel
+++ b/target/config/Config.in.kernel
@@ -52,6 +52,7 @@ config ADK_TARGET_KERNEL_MINICONFIG
 	default "qemu-x86_64" if ADK_TARGET_SYSTEM_QEMU_X86_64
 	default "qemu-xtensa" if ADK_TARGET_SYSTEM_QEMU_XTENSA
 	default "qemu-alpha" if ADK_TARGET_SYSTEM_QEMU_ALPHA
+	default "qemu-m68k" if ADK_TARGET_SYSTEM_QEMU_M68K
 	default "aranym-m68k" if ADK_TARGET_SYSTEM_ARANYM_M68K
 	default "vbox-x86" if ADK_TARGET_SYSTEM_VBOX_X86
 	default "ibm-x40" if ADK_TARGET_SYSTEM_IBM_X40
diff --git a/target/config/Config.in.libc.choice b/target/config/Config.in.libc.choice
index 41905898c..e95e48e96 100644
--- a/target/config/Config.in.libc.choice
+++ b/target/config/Config.in.libc.choice
@@ -23,6 +23,7 @@ config ADK_TARGET_LIB_MUSL
 	prompt "musl C library"
 	boolean
 	select ADK_musl
+	depends on !ADK_TARGET_UCLINUX
 	depends on \
 		ADK_LINUX_ARM || \
 		ADK_LINUX_MICROBLAZE || \
@@ -39,6 +40,7 @@ config ADK_TARGET_LIB_GLIBC
 	boolean
 	select ADK_glibc
 	depends on !ADK_LINUX_XTENSA
+	depends on !ADK_TARGET_UCLINUX
 	help
 	  http://www.gnu.org/libc
 
diff --git a/target/config/Config.in.libc.default b/target/config/Config.in.libc.default
index cd160a4cb..6d094cf05 100644
--- a/target/config/Config.in.libc.default
+++ b/target/config/Config.in.libc.default
@@ -23,9 +23,7 @@ config ADK_TARGET_LIBC
 config ADK_TARGET_WITH_NPTL
 	boolean
 	default n if ADK_TARGET_LIB_UCLIBC_NG && ADK_LINUX_M68K
-	default n if ADK_TARGET_LIB_UCLIBC_NG && ADK_LINUX_MICROBLAZE
 	default n if ADK_TARGET_LIB_UCLIBC && ADK_LINUX_M68K
-	default n if ADK_TARGET_LIB_UCLIBC && ADK_LINUX_MICROBLAZE
 	default y
 
 config ADK_TARGET_SUFFIX
diff --git a/target/config/Config.in.runtime b/target/config/Config.in.runtime
index b7bc2462d..1f70460e8 100644
--- a/target/config/Config.in.runtime
+++ b/target/config/Config.in.runtime
@@ -150,6 +150,7 @@ config ADK_RUNTIME_KBD_LAYOUT
 
 choice
 prompt "initial login shell for the root user"
+default ADK_ROOTSH_HUSH if ADK_TARGET_UCLINUX
 default ADK_ROOTSH_MKSH
 
 config ADK_ROOTSH_MKSH
@@ -159,6 +160,12 @@ config ADK_ROOTSH_MKSH
 	  Use mksh (a Korn Shell variant) as standard login shell
 	  for the superuser.
 
+config ADK_ROOTSH_HUSH
+	select ADK_PACKAGE_HUSH if !ADK_TOOLCHAIN_ONLY
+	bool "hush (Shell compatible with non-MMU systems)"
+	help
+	  hush shell from busybox.
+
 config ADK_ROOTSH_ASH
 	select BUSYBOX_ASH
 	bool "ash (busybox)"
@@ -190,6 +197,7 @@ endchoice
 
 choice
 prompt "system /bin/sh (POSIX script shell)"
+default ADK_BINSH_HUSH if ADK_TARGET_UCLINUX
 default ADK_BINSH_MKSH
 
 config ADK_BINSH_MKSH
@@ -199,6 +207,12 @@ config ADK_BINSH_MKSH
 	  Use mksh (a Korn Shell variant) as system shell, which is
 	  both small and powerful, so quite suited for this task.
 
+config ADK_BINSH_HUSH
+	select ADK_PACKAGE_HUSH if !ADK_TOOLCHAIN_ONLY
+	bool "hush (busybox)"
+	help
+	  hush shell.
+
 config ADK_BINSH_ASH
 	select BUSYBOX_ASH
 	bool "ash (busybox)"
diff --git a/target/config/Config.in.target b/target/config/Config.in.target
index 6887df312..d0ed59bfe 100644
--- a/target/config/Config.in.target
+++ b/target/config/Config.in.target
@@ -3,6 +3,7 @@
 
 config ADK_TARGET_CFLAGS
 	string
+	default "-march=isaaplus -mcpu=5208" if ADK_CPU_CF_5208
 	default "-mcpu=v7.10.d" if ADK_CPU_MICROBLAZE
 	default "-m4 -ml" if ADK_CPU_SH4 && ADK_little
 	default "-m4 -mb" if ADK_CPU_SH4 && ADK_big
diff --git a/target/config/Config.in.toolchain b/target/config/Config.in.toolchain
index bda929a88..9a799d72c 100644
--- a/target/config/Config.in.toolchain
+++ b/target/config/Config.in.toolchain
@@ -128,6 +128,7 @@ config ADK_DEBUG_STRIP
 config ADK_TARGET_USE_STATIC_LIBS
 	bool "Link applications statically by default"
 	default n
+	default y if ADK_TARGET_UCLINUX
 	select BUSYBOX_STATIC
 	help
 	  Useful for debugging of dynamic linker problems. Be aware of the fact, that uClibc and glibc
diff --git a/target/m68k/Makefile b/target/m68k/Makefile
index bc48f9890..7de6f6001 100644
--- a/target/m68k/Makefile
+++ b/target/m68k/Makefile
@@ -7,9 +7,22 @@ include $(ADK_TOPDIR)/mk/modules.mk
 include $(ADK_TOPDIR)/mk/kernel-build.mk
 include $(ADK_TOPDIR)/mk/image.mk
 
-KERNEL:=$(LINUX_DIR)/vmlinux.gz
+KERNEL:=$(LINUX_DIR)/vmlinux
+QEMU_ARGS:=${ADK_QEMU_ARGS}
+QEMU_ARGS+=-M mcf5208evb -cpu m5206
 
 # target helper text
+ifeq ($(ADK_TARGET_FS),archive)
+targethelp:
+	@echo "The RootFS tarball is: $(FW_DIR)/$(ROOTFSTARBALL)"
+ifeq ($(ADK_TARGET_QEMU),y)
+	@echo 'The kernel file is: $(FW_DIR)/${TARGET_KERNEL}'
+	@echo "Use following command to create a QEMU Image:"
+	@echo "./scripts/create.sh qemu-${ADK_TARGET_CPU_ARCH}.img $(FW_DIR)/$(ROOTFSTARBALL)"
+	@echo "Start qemu with following options:"
+	@echo 'qemu-system-${ADK_TARGET_CPU_ARCH} ${QEMU_ARGS} -kernel $(FW_DIR)/$(TARGET_KERNEL) qemu-${ADK_TARGET_CPU_ARCH}.img'
+endif
+endif
 ifeq ($(ADK_TARGET_FS),initramfs)
 targethelp:
 	@echo 'The kernel file is: $(FW_DIR)/${TARGET_KERNEL}'
@@ -23,6 +36,14 @@ ifeq ($(ADK_TARGET_SYSTEM_ARANYM_M68K),y)
 	@echo 'Ungrab mouse with middle mouse click'
 endif
 endif
+ifeq ($(ADK_TARGET_FS),initramfspiggyback)
+targethelp:
+	@echo 'The kernel+initramfs file is: $(FW_DIR)/${TARGET_KERNEL}'
+ifeq ($(ADK_TARGET_QEMU),y)
+	@echo "Start qemu with following command line:"
+	@echo 'qemu-system-${ADK_TARGET_CPU_ARCH} ${QEMU_ARGS} -kernel $(FW_DIR)/$(TARGET_KERNEL)'
+endif
+endif
 
 kernel-strip:
 
@@ -30,6 +51,12 @@ kernel-install: kernel-strip
 	@cp $(KERNEL) $(FW_DIR)/$(TARGET_KERNEL)
 
 # filesystem specific targets
+ifeq ($(ADK_TARGET_FS),archive)
+imageinstall: kernel-install $(FW_DIR)/$(ROOTFSUSERTARBALL) targethelp
+endif
 ifeq ($(ADK_TARGET_FS),initramfs)
 imageinstall: kernel-install $(FW_DIR)/$(INITRAMFS) targethelp
 endif
+ifeq ($(ADK_TARGET_FS),initramfspiggyback)
+imageinstall: createinitramfs targethelp
+endif
diff --git a/target/m68k/kernel/qemu-m68k b/target/m68k/kernel/qemu-m68k
new file mode 100644
index 000000000..f9fbf383e
--- /dev/null
+++ b/target/m68k/kernel/qemu-m68k
@@ -0,0 +1,16 @@
+CONFIG_M68K=y
+CONFIG_COLDFIRE=y
+CONFIG_M520x=y
+# CONFIG_MMU is not set
+CONFIG_CLOCK_SET=y
+CONFIG_CLOCK_FREQ=166666666
+CONFIG_M5208EVB=y
+CONFIG_RAMBASE=0x40000000
+CONFIG_RAMSIZE=0x2000000
+CONFIG_VECTORBASE=0x40000000
+CONFIG_KERNELBASE=0x40020000
+CONFIG_BINFMT_FLAT=y
+CONFIG_SERIAL_MCF=y
+CONFIG_SERIAL_MCF_BAUDRATE=115200
+CONFIG_SERIAL_MCF_CONSOLE=y
+
diff --git a/target/m68k/systems/qemu-m68k b/target/m68k/systems/qemu-m68k
new file mode 100644
index 000000000..7e381be99
--- /dev/null
+++ b/target/m68k/systems/qemu-m68k
@@ -0,0 +1,11 @@
+config ADK_TARGET_SYSTEM_QEMU_M68K
+	bool "Qemu M68K"
+	select ADK_m68k
+	select ADK_qemu_m68k
+	select ADK_CPU_CF_5208
+	select ADK_TARGET_QEMU
+	select ADK_TARGET_UCLINUX
+	select ADK_TARGET_KERNEL_ZIMAGE
+	help
+	 Support for Qemu Emulator M68K/Coldfire without MMU.
+
diff --git a/target/m68k/uclibc-ng.config b/target/m68k/uclibc-ng.config
index 6a965bd2f..469da7217 100644
--- a/target/m68k/uclibc-ng.config
+++ b/target/m68k/uclibc-ng.config
@@ -34,9 +34,9 @@ ARCH_BIG_ENDIAN=y
 # Using Big Endian
 #
 ARCH_HAS_MMU=y
-ARCH_USE_MMU=y
+# ARCH_USE_MMU is not set
 UCLIBC_HAS_FLOATS=y
-UCLIBC_HAS_FPU=y
+# UCLIBC_HAS_FPU is not set
 DO_C99_MATH=y
 DO_XSI_MATH=y
 UCLIBC_HAS_FENV=y
diff --git a/target/m68k/uclibc.config b/target/m68k/uclibc.config
new file mode 100644
index 000000000..c0e0dbe33
--- /dev/null
+++ b/target/m68k/uclibc.config
@@ -0,0 +1,222 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# uClibc-ng 1.0.0 C Library Configuration
+#
+# TARGET_alpha is not set
+# TARGET_arc is not set
+# TARGET_arm is not set
+# TARGET_bfin is not set
+# TARGET_i386 is not set
+TARGET_m68k=y
+# TARGET_metag is not set
+# TARGET_microblaze is not set
+# TARGET_mips is not set
+# TARGET_powerpc is not set
+# TARGET_sh is not set
+# TARGET_sparc is not set
+# TARGET_x86_64 is not set
+# TARGET_xtensa is not set
+
+#
+# Target Architecture Features and Options
+#
+TARGET_ARCH="m68k"
+FORCE_OPTIONS_FOR_ARCH=y
+TARGET_SUBARCH=""
+
+#
+# Using ELF file format
+#
+ARCH_HAS_DEPRECATED_SYSCALLS=y
+ARCH_BIG_ENDIAN=y
+
+#
+# Using Big Endian
+#
+ARCH_HAS_MMU=y
+ARCH_USE_MMU=y
+UCLIBC_HAS_FLOATS=y
+UCLIBC_HAS_FPU=y
+DO_C99_MATH=y
+DO_XSI_MATH=y
+UCLIBC_HAS_FENV=y
+UCLIBC_HAS_LONG_DOUBLE_MATH=y
+KERNEL_HEADERS=""
+HAVE_DOT_CONFIG=y
+
+#
+# General Library Settings
+#
+DOPIC=y
+HAVE_SHARED=y
+# FORCE_SHAREABLE_TEXT_SEGMENTS is not set
+LDSO_LDD_SUPPORT=y
+LDSO_CACHE_SUPPORT=y
+LDSO_PRELOAD_ENV_SUPPORT=y
+# LDSO_PRELOAD_FILE_SUPPORT is not set
+LDSO_BASE_FILENAME="ld.so"
+# LDSO_STANDALONE_SUPPORT is not set
+# LDSO_PRELINK_SUPPORT is not set
+UCLIBC_STATIC_LDCONFIG=y
+LDSO_RUNPATH=y
+LDSO_SAFE_RUNPATH=y
+LDSO_SEARCH_INTERP_PATH=y
+LDSO_LD_LIBRARY_PATH=y
+# LDSO_NO_CLEANUP is not set
+# LDSO_GNU_HASH_SUPPORT is not set
+HAS_NO_THREADS=y
+# UCLIBC_HAS_THREADS_NATIVE is not set
+UCLIBC_HAS_SYSLOG=y
+UCLIBC_HAS_LFS=y
+# MALLOC is not set
+# MALLOC_SIMPLE is not set
+MALLOC_STANDARD=y
+MALLOC_GLIBC_COMPAT=y
+UCLIBC_HAS_OBSTACK=y
+UCLIBC_DYNAMIC_ATEXIT=y
+UCLIBC_SUSV2_LEGACY=y
+UCLIBC_SUSV3_LEGACY=y
+# UCLIBC_SUSV3_LEGACY_MACROS is not set
+UCLIBC_SUSV4_LEGACY=y
+# UCLIBC_STRICT_HEADERS is not set
+# UCLIBC_HAS_STUBS is not set
+UCLIBC_HAS_SHADOW=y
+UCLIBC_HAS_PROGRAM_INVOCATION_NAME=y
+UCLIBC_HAS___PROGNAME=y
+UCLIBC_HAS_PTY=y
+ASSUME_DEVPTS=y
+UNIX98PTY_ONLY=y
+UCLIBC_HAS_GETPT=y
+UCLIBC_HAS_LIBUTIL=y
+UCLIBC_HAS_TM_EXTENSIONS=y
+UCLIBC_HAS_TZ_CACHING=y
+UCLIBC_HAS_TZ_FILE=y
+UCLIBC_HAS_TZ_FILE_READ_MANY=y
+UCLIBC_TZ_FILE_PATH="/etc/TZ"
+UCLIBC_FALLBACK_TO_ETC_LOCALTIME=y
+
+#
+# Advanced Library Settings
+#
+UCLIBC_PWD_BUFFER_SIZE=256
+UCLIBC_GRP_BUFFER_SIZE=256
+
+#
+# Support various families of functions
+#
+UCLIBC_LINUX_SPECIFIC=y
+UCLIBC_HAS_GNU_ERROR=y
+UCLIBC_BSD_SPECIFIC=y
+UCLIBC_HAS_BSD_ERR=y
+UCLIBC_HAS_OBSOLETE_BSD_SIGNAL=y
+# UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL is not set
+# UCLIBC_NTP_LEGACY is not set
+UCLIBC_SV4_DEPRECATED=y
+UCLIBC_HAS_REALTIME=y
+UCLIBC_HAS_ADVANCED_REALTIME=y
+UCLIBC_HAS_EPOLL=y
+UCLIBC_HAS_XATTR=y
+# UCLIBC_HAS_PROFILING is not set
+UCLIBC_HAS_CRYPT_IMPL=y
+# UCLIBC_HAS_SHA256_CRYPT_IMPL is not set
+# UCLIBC_HAS_SHA512_CRYPT_IMPL is not set
+UCLIBC_HAS_CRYPT=y
+UCLIBC_HAS_NETWORK_SUPPORT=y
+UCLIBC_HAS_SOCKET=y
+UCLIBC_HAS_IPV4=y
+UCLIBC_HAS_IPV6=y
+UCLIBC_USE_NETLINK=y
+UCLIBC_SUPPORT_AI_ADDRCONFIG=y
+UCLIBC_HAS_BSD_RES_CLOSE=y
+UCLIBC_HAS_COMPAT_RES_STATE=y
+# UCLIBC_HAS_EXTRA_COMPAT_RES_STATE is not set
+UCLIBC_HAS_RESOLVER_SUPPORT=y
+UCLIBC_HAS_LIBRESOLV_STUB=y
+UCLIBC_HAS_LIBNSL_STUB=y
+
+#
+# String and Stdio Support
+#
+UCLIBC_HAS_STRING_GENERIC_OPT=y
+UCLIBC_HAS_STRING_ARCH_OPT=y
+UCLIBC_HAS_CTYPE_TABLES=y
+UCLIBC_HAS_CTYPE_SIGNED=y
+# UCLIBC_HAS_CTYPE_UNSAFE is not set
+UCLIBC_HAS_CTYPE_CHECKED=y
+# UCLIBC_HAS_CTYPE_ENFORCED is not set
+UCLIBC_HAS_WCHAR=y
+# UCLIBC_HAS_LOCALE is not set
+UCLIBC_HAS_HEXADECIMAL_FLOATS=y
+UCLIBC_HAS_GLIBC_CUSTOM_PRINTF=y
+UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS=9
+# UCLIBC_HAS_STDIO_BUFSIZ_256 is not set
+# UCLIBC_HAS_STDIO_BUFSIZ_512 is not set
+# UCLIBC_HAS_STDIO_BUFSIZ_1024 is not set
+# UCLIBC_HAS_STDIO_BUFSIZ_2048 is not set
+UCLIBC_HAS_STDIO_BUFSIZ_4096=y
+# UCLIBC_HAS_STDIO_BUFSIZ_8192 is not set
+UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE=y
+# UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4 is not set
+# UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8 is not set
+# UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT is not set
+UCLIBC_HAS_STDIO_GETC_MACRO=y
+UCLIBC_HAS_STDIO_PUTC_MACRO=y
+UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION=y
+# UCLIBC_HAS_FOPEN_LARGEFILE_MODE is not set
+UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE=y
+# UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE is not set
+UCLIBC_HAS_GLIBC_CUSTOM_STREAMS=y
+UCLIBC_HAS_PRINTF_M_SPEC=y
+UCLIBC_HAS_ERRNO_MESSAGES=y
+# UCLIBC_HAS_SYS_ERRLIST is not set
+UCLIBC_HAS_SIGNUM_MESSAGES=y
+# UCLIBC_HAS_SYS_SIGLIST is not set
+UCLIBC_HAS_GNU_GETOPT=y
+UCLIBC_HAS_GNU_GETSUBOPT=y
+
+#
+# Big and Tall
+#
+UCLIBC_HAS_REGEX=y
+UCLIBC_HAS_FNMATCH=y
+UCLIBC_HAS_WORDEXP=y
+UCLIBC_HAS_NFTW=y
+UCLIBC_HAS_FTW=y
+UCLIBC_HAS_FTS=y
+UCLIBC_HAS_GLOB=y
+UCLIBC_HAS_GNU_GLOB=y
+UCLIBC_HAS_UTMPX=y
+
+#
+# Library Installation Options
+#
+RUNTIME_PREFIX="/"
+DEVEL_PREFIX="/usr/"
+MULTILIB_DIR="lib"
+HARDWIRED_ABSPATH=y
+
+#
+# Security options
+#
+UCLIBC_HAS_ARC4RANDOM=y
+# ARC4RANDOM_USES_NODEV is not set
+# UCLIBC_HAS_SSP is not set
+UCLIBC_BUILD_RELRO=y
+# UCLIBC_BUILD_NOW is not set
+UCLIBC_BUILD_NOEXECSTACK=y
+
+#
+# Development/debugging options
+#
+CROSS_COMPILER_PREFIX=""
+UCLIBC_EXTRA_CFLAGS=""
+# DODEBUG is not set
+# DOSTRIP is not set
+# DOASSERTS is not set
+# SUPPORT_LD_DEBUG is not set
+# SUPPORT_LD_DEBUG_EARLY is not set
+# UCLIBC_MALLOC_DEBUGGING is not set
+# UCLIBC_HAS_BACKTRACE is not set
+WARNINGS="-Wall"
+EXTRA_WARNINGS=y
+# DOMULTI is not set