Fix build of & add CMake to LM3S Qemu Demo (#1368)

* Demo/CORTEX_LM3S6965_GCC_QEMU: Trim trailing spaces & lines

* Demo/CORTEX_LM3S6965_GCC_QEMU: Fix Eclipse build 1/2 (examples)

It was trying to build the examples, which pulled in symbols such as
`_write` that are not implemented.

* Demo/CORTEX_LM3S6965_GCC_QEMU: Fix Eclipse build 1/2 (discard .ARM.exidx)

Somewhere along the line now there is the .ARM.exidx section in the
files, we don't use exceptions so can just discard it.

* Demo/CORTEX_LM3S6965_GCC_QEMU: Add CMake

* Debug/CORTEX_LM3S6965_GCC_QEMU: Fix Qemu startup

It was tripping on port.c

        /* Check that the maximum system call priority is nonzero after
         * accounting for the number of priority bits supported by the
         * hardware. A priority of 0 is invalid because setting the BASEPRI
         * register to 0 unmasks all interrupts, and interrupts with priority 0
         * cannot be masked using BASEPRI.
         * See https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
        configASSERT( ucMaxSysCallPriority );

Inspecting the value ucMaxPriorityValue gave 0xE0, and setting it to
0xE0 complains about overflow in
FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/LocalDemoFiles/IntQueueTimer.c:57

    /* Shift left 5 as only the top 3 bits are implemented. */
    IntPrioritySet( INT_TIMER2A, configMAX_SYSCALL_INTERRUPT_PRIORITY + ( 1 << 5 ) );

* Add qemu options to run in headless mode

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

---------

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>
Co-authored-by: Gaurav Aggarwal <aggarg@amazon.com>

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/.cproject

@@ -202,7 +202,7 @@
 						</tool>
 					</fileInfo>
 					<sourceEntries>
-						<entry excluding="FreeRTOS+Trace Recorder" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
+						<entry excluding="FreeRTOS_Source/examples|build|FreeRTOS+Trace Recorder" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
 					</sourceEntries>
 				</configuration>
 			</storageModule>

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/CMakeLists.txt

@@ -0,0 +1,58 @@
+cmake_minimum_required(VERSION 3.21)
+
+project(RTOSDemo LANGUAGES C ASM)
+
+set(FREERTOS_BASE "${CMAKE_CURRENT_LIST_DIR}/../../")
+set(FREERTOS_PORT GCC_ARM_CM3)
+set(FREERTOS_HEAP 4)
+add_library(freertos_config INTERFACE)
+target_include_directories(freertos_config INTERFACE .)
+add_subdirectory("${FREERTOS_BASE}/Source" FreeRTOS_kernel)
+
+add_executable(RTOSDemo
+    startup.c
+    main.c
+    LocalDemoFiles/IntQueueTimer.c
+    LocalDemoFiles/osram128x64x4.c
+    LocalDemoFiles/printf-stdarg.c
+    LocalDemoFiles/timertest.c
+
+    ../Common/Minimal/blocktim.c
+    ../Common/Minimal/death.c
+    ../Common/Minimal/EventGroupsDemo.c
+    ../Common/Minimal/IntQueue.c
+    ../Common/Minimal/MessageBufferDemo.c
+    ../Common/Minimal/QPeek.c
+    ../Common/Minimal/QueueSet.c
+    ../Common/Minimal/recmutex.c
+    ../Common/Minimal/semtest.c
+    ../Common/Minimal/StreamBufferDemo.c
+
+    ../Common/drivers/LuminaryMicro/ustdlib.c
+)
+target_include_directories(RTOSDemo PUBLIC
+    .
+    LocalDemoFiles
+    ../Common/include
+    ../Common/drivers/LuminaryMicro
+)
+target_link_libraries(RTOSDemo PUBLIC
+    freertos_kernel
+    "${CMAKE_CURRENT_LIST_DIR}/../Common/drivers/LuminaryMicro/arm-none-eabi-gcc/libdriver.a"
+    "${CMAKE_CURRENT_LIST_DIR}/../Common/drivers/LuminaryMicro/arm-none-eabi-gcc/libgr.a"
+)
+
+add_custom_target(run
+    COMMAND qemu-system-arm
+        -machine lm3s6965evb
+        -monitor null
+        -semihosting
+        --semihosting-config enable=on,target=native
+        -serial stdio
+        -nographic
+        -s # gdb tcp::1234
+        -S
+        -kernel $<TARGET_FILE:RTOSDemo>
+    VERBATIM COMMAND_EXPAND_LISTS
+    COMMENT "You can now attach GDB to localhost:1234"
+)

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/CMakePresets.json

@@ -0,0 +1,36 @@
+{
+  "version": 6,
+  "configurePresets": [
+    {
+      "name": "debug",
+      "toolchainFile": "gcc-arm-embedded.cmake",
+      "binaryDir": "build",
+      "generator": "Ninja",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "debug",
+        "CMAKE_EXPORT_COMPILE_COMMANDS": true
+      }
+    }
+  ],
+  "buildPresets": [
+    {
+      "name": "debug",
+      "configurePreset": "debug"
+    }
+  ],
+  "workflowPresets": [
+    {
+      "name": "debug",
+      "steps": [
+        {
+          "type": "configure",
+          "name": "debug"
+        },
+        {
+          "type": "build",
+          "name": "debug"
+        }
+      ]
+    }
+  ]
+}

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/FreeRTOSConfig.h

@@ -95,7 +95,7 @@ FreeRTOS/Source/tasks.c for limitations. */
 #define configKERNEL_INTERRUPT_PRIORITY 		( 255 )	/* All eight bits as QEMU doesn't model the priority bits. */
 /* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
 See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
-#define configMAX_SYSCALL_INTERRUPT_PRIORITY 	( 4 )
+#define configMAX_SYSCALL_INTERRUPT_PRIORITY 	( 0x40 )
 
 /* Use the Cortex-M3 optimised task selection rather than the generic C code
 version. */

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/StartQEMU.bat

@@ -1,2 +1 @@
 qemu-system-arm -machine lm3s6965evb -s -S -kernel ./debug/RTOSDemo.elf
-

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/gcc-arm-embedded.cmake

@@ -0,0 +1,52 @@
+set(CMAKE_SYSTEM_NAME      Generic)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+
+set(CMAKE_TOOLCHAIN_PREFIX arm-none-eabi-)
+
+set(CMAKE_C_COMPILER   ${CMAKE_TOOLCHAIN_PREFIX}gcc)
+set(CMAKE_ASM_COMPILER ${CMAKE_C_COMPILER})
+set(CMAKE_CXX_COMPILER ${CMAKE_TOOLCHAIN_PREFIX}g++)
+set(CMAKE_LINKER       ${CMAKE_TOOLCHAIN_PREFIX}gcc)
+set(CMAKE_OBJCOPY      ${CMAKE_TOOLCHAIN_PREFIX}objcopy)
+set(CMAKE_SIZE         ${CMAKE_TOOLCHAIN_PREFIX}size)
+
+set(CMAKE_EXECUTABLE_SUFFIX_ASM ".elf")
+set(CMAKE_EXECUTABLE_SUFFIX_C   ".elf")
+set(CMAKE_EXECUTABLE_SUFFIX_CXX ".elf")
+
+# Adjust the default behavior of the FIND_XXX() commands:
+# - Search programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+# - Search headers and libraries in the target environment
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+# Don't try to execute linked programs
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+
+set(CMAKE_C_FLAGS_INIT "-mcpu=cortex-m3 -mthumb")
+set(CMAKE_C_FLAGS_INIT "${CMAKE_C_FLAGS_INIT} --specs=nano.specs")
+
+# Always build debug information (stripped out for executable)
+# Add `-g3` to put macro values into debug information
+if(CMAKE_BUILD_TYPE MATCHES Debug)
+    set(CMAKE_C_FLAGS_INIT "${CMAKE_C_FLAGS_INIT} -O0 -g3")
+endif()
+if(CMAKE_BUILD_TYPE MATCHES Release)
+    set(CMAKE_C_FLAGS_INIT "${CMAKE_C_FLAGS_INIT} -O3 -g3")
+endif()
+if(CMAKE_BUILD_TYPE MATCHES MinSizeRel)
+    set(CMAKE_C_FLAGS_INIT "${CMAKE_C_FLAGS_INIT} -Os -g3")
+endif()
+
+set(CMAKE_ASM_FLAGS_INIT "${CMAKE_C_FLAGS_INIT} -x assembler-with-cpp")
+set(CMAKE_CXX_FLAGS_INIT "${CMAKE_C_FLAGS_INIT} -fno-rtti -fno-exceptions")
+
+set(CMAKE_ASM_LINK_FLAGS "-T ${CMAKE_CURRENT_LIST_DIR}/standalone.ld -nostartfiles")
+set(CMAKE_ASM_LINK_FLAGS "${CMAKE_ASM_LINK_FLAGS} -Wl,-Map=${CMAKE_PROJECT_NAME}.map")
+set(CMAKE_ASM_LINK_FLAGS "${CMAKE_ASM_LINK_FLAGS} -Wl,--print-memory-usage")
+
+set(CMAKE_C_LINK_FLAGS "${CMAKE_ASM_LINK_FLAGS} -Wl,--start-group -lc -lm -Wl,--end-group")
+set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -ffunction-sections -fdata-sections -Wl,--gc-sections")
+
+set(CMAKE_CXX_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -Wl,--start-group -lstdc++ -lsupc++ -Wl,--end-group")

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/standalone.ld

@@ -4,24 +4,24 @@
  *                 DriverLib.
  *
  * Copyright (c) 2005-2007 Luminary Micro, Inc.  All rights reserved.
- * 
+ *
  * Software License Agreement
- * 
+ *
  * Luminary Micro, Inc. (LMI) is supplying this software for use solely and
  * exclusively on LMI's microcontroller products.
- * 
+ *
  * The software is owned by LMI and/or its suppliers, and is protected under
  * applicable copyright laws.  All rights are reserved.  Any use in violation
  * of the foregoing restrictions may subject the user to criminal sanctions
  * under applicable laws, as well as to civil liability for the breach of the
  * terms and conditions of this license.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
  * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
  * LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
  * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
- * 
+ *
  * This is part of revision 1392 of the Stellaris Peripheral Driver Library.
  *
  *****************************************************************************/
@@ -57,4 +57,9 @@ SECTIONS
         *(COMMON)
         _ebss = .;
     } > SRAM
+
+    /DISCARD/ :
+    {
+        *(.ARM.exidx)
+    }
 }

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/startup.c

@@ -252,4 +252,3 @@ uipprintf(const char *fmt, ...)
 	( void ) fmt;
     return(0);
 }
-

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/trcConfig.h

@@ -123,7 +123,7 @@ __attribute__( ( always_inline ) ) static inline void __set_PRIMASK(uint32_t pri
  * trace recorder library with an older version of FreeRTOS).
  *
  * TRC_FREERTOS_VERSION_7_3_X          If using FreeRTOS v7.3.X
- * TRC_FREERTOS_VERSION_7_4_X          If using FreeRTOS v7.4.X 
+ * TRC_FREERTOS_VERSION_7_4_X          If using FreeRTOS v7.4.X
  * TRC_FREERTOS_VERSION_7_5_X          If using FreeRTOS v7.5.X
  * TRC_FREERTOS_VERSION_7_6_X          If using FreeRTOS v7.6.X
  * TRC_FREERTOS_VERSION_8_X_X          If using FreeRTOS v8.X.X