configs/sim/loadable: Add loadable demo for arch sim

configs/sim/README.txt

@@ -561,6 +561,12 @@ ipforward
   Additional required settings will also be selected when you manually
   select the above via 'make menuconfig'.
 
+loadable
+
+  This configuration provides an example of loadable apps.  It cannot used
+  with any Windows configuration, however, because Windows does not use
+  the ELF format.
+
 minibasic
 
   This configuration was used to test the Mini Basic port at

configs/sim/loadable/defconfig

@@ -0,0 +1,46 @@
+CONFIG_APPS_LOADABLE=y
+CONFIG_ARCH="sim"
+CONFIG_ARCH_BOARD="sim"
+CONFIG_ARCH_BOARD_SIM=y
+CONFIG_ARCH_SIM=y
+CONFIG_BINFMT_EXEPATH=y
+CONFIG_BOARDCTL_APP_SYMTAB=y
+CONFIG_BOARDCTL_POWEROFF=y
+CONFIG_BUILTIN=y
+CONFIG_CLOCK_MONOTONIC=y
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_ELF=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_EXAMPLES_HELLO_STACKSIZE=8192
+CONFIG_EXECFUNCS_HAVE_SYMTAB=y
+CONFIG_FS_HOSTFS=y
+CONFIG_FS_PROCFS=y
+CONFIG_IDLETHREAD_STACKSIZE=4096
+CONFIG_INIT_FILEPATH=y
+CONFIG_INIT_MOUNT_DATA="fs=../apps/exe/system"
+CONFIG_INIT_MOUNT_FLAGS=0x1
+CONFIG_INIT_MOUNT_FSTYPE="hostfs"
+CONFIG_INIT_MOUNT_TARGET="/system"
+CONFIG_LIBC_EXECFUNCS=y
+CONFIG_MEMSET_OPTSPEED=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_LINELEN=128
+CONFIG_NSH_READLINE=y
+CONFIG_PATH_INITIAL="/system/bin"
+CONFIG_RAW_BINARY=y
+CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_READLINE_TABCOMPLETION=y
+CONFIG_SCHED_HAVE_PARENT=y
+CONFIG_SCHED_ONEXIT=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_SIM_M32=y
+CONFIG_SIM_WALLTIME=y
+CONFIG_START_MONTH=6
+CONFIG_START_YEAR=2008
+CONFIG_SYSTEM_NSH=y
+CONFIG_TIME_EXTENDED=y
+CONFIG_USERMAIN_STACKSIZE=4096
+CONFIG_USER_INITPATH="/system/bin/nsh"