configs/olimex-stm32-p407/kmodule: Add a configuration that can be used for testing installation of kernel modules in the protected build. This configuration is useless in its present state, not due to any problem with the OS itself, but rather with the current apps/ build system. The symbol table is built by apps/examples/module/drivers/Makefile in user space. The problem with that is that the kernel module does reference internal kernel symbols which are not available in the user space build context. A mechanism is needed in the build system to build the symbol table in the context of the kernel. There is currently no way to do that.

configs/olimex-stm32-p407/README.txt

@@ -309,6 +309,37 @@ must be is one of the following.
        apps/example/elf will wait on power up until the USB FLASH driver
        has been inserted and initialized.
 
+  kmodule:
+
+    This is a protected mode version of the apps/examples/module test of
+    loadable ELF kernel modules.  This version is unique because the ELF
+    programs are loaded into the protected kernel space.
+
+    NOTES:
+
+    1. See build recommendations and instructions for combining the .hex
+       files under the knsh configuration.  These instructions are common
+       for all protected mode builds.
+
+    2. Unlike other versions of apps/examples/module configurations, the test
+       ELF modules are not provided internally on a ROMFS or CROMFS file
+       system.  This is due to the fact that those file systems are built in
+       user space and there is no mechanism in the build system to easily
+       get them into the kernel space.
+
+       Instead, the module(s) must be copied to a USB FLASH drive from your
+       host PC.  The module(s) can be found at apps/examples/module/driver/fsroot.
+       All of those file(s) should be copied to the USB FLASH drive.  Lik the
+       kelf configuration, the logic in apps/example/module will wait on power
+       up until the USB FLASH driver has been inserted and initialized.
+
+    STATUS:  There is an issue that makes this configuration unusable at the
+      present time:  The symbol table is built by apps/examples/module/drivers/Makefile
+      in user space.  The problem with that is that the kernel module does reference
+      internal kernel symbols which are not available in the user space build context.
+      A mechanism is needed in the build system to build the symbol table in the
+      context of the kernel.  There is currently no way to do that.
+
   knsh:
 
     This is identical to the nsh configuration below except that NuttX

configs/olimex-stm32-p407/kelf/Make.defs

@@ -96,7 +96,18 @@ NXFLATLDFLAGS1 = -r -d -warn-common
 NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)$(DELIM)binfmt$(DELIM)libnxflat$(DELIM)gnu-nxflat-pcrel.ld -no-check-sections
 LDNXFLATFLAGS = -e main -s 2048
 
-# ELF module definitions
+# ELF kernael module definitions
+
+CMODULEFLAGS = $(CFLAGS) -mlong-calls # --target1-abs
+
+LDMODULEFLAGS = -r -e module_initialize
+ifeq ($(WINTOOL),y)
+  LDMODULEFLAGS += -T "${shell cygpath -w $(TOPDIR)/libs/libc/modlib/gnu-elf.ld}"
+else
+  LDMODULEFLAGS += -T $(TOPDIR)/libs/libc/modlib/gnu-elf.ld
+endif
+
+# ELF program module definitions
 
 CELFFLAGS = $(CFLAGS) -mlong-calls # --target1-abs
 CXXELFFLAGS = $(CXXFLAGS) -mlong-calls # --target1-abs

configs/olimex-stm32-p407/kmodule/Make.defs

@@ -0,0 +1,148 @@
+############################################################################
+# configs/olimex-stm32-p407/kmodule/Make.defs
+#
+#   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+include ${TOPDIR}/.config
+include ${TOPDIR}/tools/Config.mk
+include ${TOPDIR}$(DELIM)arch$(DELIM)arm$(DELIM)src$(DELIM)armv7-m$(DELIM)Toolchain.defs
+
+ifeq ($(WINTOOL),y)
+  # Windows-native toolchains
+  DIRLINK = $(TOPDIR)/tools/copydir.sh
+  DIRUNLINK = $(TOPDIR)/tools/unlink.sh
+  MKDEP = $(TOPDIR)/tools/mkwindeps.sh
+  ARCHINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)$(DELIM)include}"
+  ARCHXXINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)$(DELIM)include}" -isystem "${shell cygpath -w $(TOPDIR)$(DELIM)include$(DELIM)cxx}"
+  ARCHSCRIPT = -T "${shell cygpath -w $(TOPDIR)$(DELIM)configs$(DELIM)$(CONFIG_ARCH_BOARD)$(DELIM)scripts$(DELIM)memory.ld}"
+  ARCHSCRIPT += -T "${shell cygpath -w $(TOPDIR)$(DELIM)configs$(DELIM)$(CONFIG_ARCH_BOARD)$(DELIM)scripts$(DELIM)kernel-space.ld}"
+else
+  # Linux/Cygwin-native toolchain
+  MKDEP = $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
+  ARCHINCLUDES = -I. -isystem $(TOPDIR)$(DELIM)include
+  ARCHXXINCLUDES = -I. -isystem $(TOPDIR)$(DELIM)include -isystem $(TOPDIR)$(DELIM)include$(DELIM)cxx
+  ARCHSCRIPT = -T$(TOPDIR)$(DELIM)configs$(DELIM)$(CONFIG_ARCH_BOARD)$(DELIM)scripts$(DELIM)memory.ld
+  ARCHSCRIPT += -T$(TOPDIR)$(DELIM)configs$(DELIM)$(CONFIG_ARCH_BOARD)$(DELIM)scripts$(DELIM)kernel-space.ld
+endif
+
+CC = $(CROSSDEV)gcc
+CXX = $(CROSSDEV)g++
+CPP = $(CROSSDEV)gcc -E
+LD = $(CROSSDEV)ld
+STRIP = $(CROSSDEV)strip --strip-unneeded
+AR = $(ARCROSSDEV)ar rcs
+NM = $(ARCROSSDEV)nm
+OBJCOPY = $(CROSSDEV)objcopy
+OBJDUMP = $(CROSSDEV)objdump
+
+ARCHCCVERSION = ${shell $(CC) -v 2>&1 | sed -n '/^gcc version/p' | sed -e 's/^gcc version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q'}
+ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1}
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  ARCHOPTIMIZATION = -g
+endif
+
+ifneq ($(CONFIG_DEBUG_NOOPT),y)
+  ARCHOPTIMIZATION += $(MAXOPTIMIZATION) -fno-strict-aliasing -fno-strength-reduce -fomit-frame-pointer
+endif
+
+ARCHCFLAGS = -fno-builtin
+ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fcheck-new -fno-rtti
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
+ARCHWARNINGSXX = -Wall -Wshadow -Wundef
+ARCHDEFINES =
+ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
+
+CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
+CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
+CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+AFLAGS = $(CFLAGS) -D__ASSEMBLY__
+
+# NXFLAT module definitions
+
+NXFLATLDFLAGS1 = -r -d -warn-common
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)$(DELIM)binfmt$(DELIM)libnxflat$(DELIM)gnu-nxflat-pcrel.ld -no-check-sections
+LDNXFLATFLAGS = -e main -s 2048
+
+# ELF kernael module definitions
+
+CMODULEFLAGS = $(CFLAGS) -mlong-calls # --target1-abs
+
+LDMODULEFLAGS = -r -e module_initialize
+ifeq ($(WINTOOL),y)
+  LDMODULEFLAGS += -T "${shell cygpath -w $(TOPDIR)/libs/libc/modlib/gnu-elf.ld}"
+else
+  LDMODULEFLAGS += -T $(TOPDIR)/libs/libc/modlib/gnu-elf.ld
+endif
+
+# ELF program module definitions
+
+CELFFLAGS = $(CFLAGS) -mlong-calls # --target1-abs
+CXXELFFLAGS = $(CXXFLAGS) -mlong-calls # --target1-abs
+
+LDELFFLAGS = -r -e main
+ifeq ($(WINTOOL),y)
+  LDELFFLAGS += -T "${shell cygpath -w  $(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)modlib$(DELIM)gnu-elf.ld}"
+else
+  LDELFFLAGS += -T  $(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)modlib$(DELIM)gnu-elf.ld
+endif
+
+# File extensions
+
+ASMEXT = .S
+OBJEXT = .o
+LIBEXT = .a
+EXEEXT =
+
+# Linker flags
+
+ifneq ($(CROSSDEV),arm-nuttx-elf-)
+  LDFLAGS += -nostartfiles -nodefaultlibs
+endif
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDFLAGS += -g
+endif
+
+# Host tools
+
+HOSTCC = gcc
+HOSTINCLUDES = -I.
+HOSTCFLAGS = -Wall -Wstrict-prototypes -Wshadow -Wundef -g -pipe
+HOSTLDFLAGS =
+ifeq ($(CONFIG_HOST_WINDOWS),y)
+  HOSTEXEEXT = .exe
+else
+  HOSTEXEEXT =
+endif

configs/olimex-stm32-p407/kmodule/defconfig

@@ -0,0 +1,73 @@
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="olimex-stm32-p407"
+CONFIG_ARCH_BOARD_OLIMEX_STM32P407=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32F407ZG=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_IRQBUTTONS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARMV7M_USEBASEPRI=y
+CONFIG_ARM_MPU=y
+CONFIG_BOARD_LOOPSPERMSEC=16717
+CONFIG_BUILD_PROTECTED=y
+CONFIG_DEBUG_ASSERTIONS=y
+CONFIG_DEBUG_BINFMT=y
+CONFIG_DEBUG_BINFMT_ERROR=y
+CONFIG_DEBUG_BINFMT_WARN=y
+CONFIG_DEBUG_CUSTOMOPT=y
+CONFIG_DEBUG_ERROR=y
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_FS=y
+CONFIG_DEBUG_FS_ERROR=y
+CONFIG_DEBUG_FS_WARN=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEBUG_USB=y
+CONFIG_DEBUG_USB_ERROR=y
+CONFIG_DEBUG_USB_WARN=y
+CONFIG_DEBUG_WARN=y
+CONFIG_EXAMPLES_MODULE=y
+CONFIG_EXAMPLES_MODULE_DEVPATH="/dev/sda"
+CONFIG_EXAMPLES_MODULE_FSREMOVEABLE=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FS_FAT=y
+CONFIG_FS_PROCFS=y
+CONFIG_HOST_WINDOWS=y
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIB_BOARDCTL=y
+CONFIG_MAX_TASKS=16
+CONFIG_MAX_WDOGPARMS=2
+CONFIG_MM_KERNEL_HEAPSIZE=16384
+CONFIG_MM_REGIONS=2
+CONFIG_MODULE=y
+CONFIG_NFILE_DESCRIPTORS=8
+CONFIG_NFILE_STREAMS=8
+CONFIG_NUTTX_USERSPACE=0x08020000
+CONFIG_PASS1_BUILDIR="configs/olimex-stm32-p407/kernel"
+CONFIG_PREALLOC_MQ_MSGS=4
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_PREALLOC_WDOGS=4
+CONFIG_RAM_SIZE=114688
+CONFIG_RAM_START=0x20000000
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_START_DAY=5
+CONFIG_START_MONTH=8
+CONFIG_STM32_CCMEXCLUDE=y
+CONFIG_STM32_DISABLE_IDLE_SLEEP_DURING_DEBUG=y
+CONFIG_STM32_JTAG_SW_ENABLE=y
+CONFIG_STM32_OTGFS=y
+CONFIG_STM32_PWR=y
+CONFIG_STM32_USART3=y
+CONFIG_SYMTAB_ORDEREDBYNAME=y
+CONFIG_SYS_RESERVED=8
+CONFIG_USART3_SERIAL_CONSOLE=y
+CONFIG_USBHOST=y
+CONFIG_USBHOST_ISOC_DISABLE=y
+CONFIG_USBHOST_MSC=y
+CONFIG_USER_ENTRYPOINT="module_main"
+CONFIG_WDOG_INTRESERVE=0