[BSP][stm32f4xx-HAL] Add GNU GCC support.

bsp/stm32f4xx-HAL/Libraries/CMSIS/Device/ST/STM32F4xx/Source/Templates/gcc/gcc_startup.s

+/**
+  *************** (C) COPYRIGHT 2017 STMicroelectronics ************************
+  * @file      gcc_startup.s
+  * @author    MCD Application Team
+  * @version   V4.2.0
+  * @date      31-March-2017
+  * @brief     Based on STM32F103xE's startup file.
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Configure the clock system
+  *                - Configure external SRAM mounted on STM3210E-EVAL board
+  *                  to be used as data memory (optional, to be enabled by user)
+  *                - Branches to entry in the C library (which eventually
+  *                  calls main(), but entry() in RT-Thread).
+  *            After Reset the Cortex-M3 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * 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 of STMicroelectronics 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 HOLDER 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.
+  *
+  ******************************************************************************
+  */
+
+  .syntax unified
+  .cpu cortex-m3
+  .fpu softvfp
+  .thumb
+
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called.
+ * @param  None
+ * @retval : None
+*/
+
+  .global Reset_Handler
+
+  .section .text.Reset_Handler
+  .type Reset_Handler, %function
+Reset_Handler:
+
+/* Copy the data segment initializers from flash to SRAM */
+  movs r1, #0
+  b LoopCopyDataInit
+
+CopyDataInit:
+  ldr r3, =_sidata
+  ldr r3, [r3, r1]
+  str r3, [r0, r1]
+  adds r1, r1, #4
+
+LoopCopyDataInit:
+  ldr r0, =_sdata
+  ldr r3, =_edata
+  adds r2, r0, r1
+  cmp r2, r3
+  bcc CopyDataInit
+  ldr r2, =_sbss
+  b LoopFillZerobss
+/* Zero fill the bss segment. */
+FillZerobss:
+  movs r3, #0
+  str r3, [r2], #4
+
+LoopFillZerobss:
+  ldr r3, = _ebss
+  cmp r2, r3
+  bcc FillZerobss
+
+/* Call the clock system intitialization function.*/
+  bl  SystemInit
+/* Call static constructors */
+  /* bl __libc_init_array */
+/* Call the application's entry point.*/
+  bl entry
+  bx lr
+.size Reset_Handler, .-Reset_Handler
+

bsp/stm32f4xx-HAL/Libraries/CMSIS/SConscript

@@ -61,10 +61,12 @@ CPPDEFINES = [STM32_TYPE]
 # add for startup script 
 if rtconfig.CROSS_TOOL == 'gcc':
      folder = 'gcc'
+     src += ['Device/ST/STM32F4xx/Source/Templates/gcc/gcc_startup.s']
 elif rtconfig.CROSS_TOOL == 'keil':
      folder = 'arm'
 elif rtconfig.CROSS_TOOL == 'iar':
      folder = 'iar'
+
 #Device/ST/STM32F4xx/Source/Templates/iar/startup_stm32f411xe.s     
 src += ['Device/ST/STM32F4xx/Source/Templates/' + folder + '/startup_' + STM32_TYPE.lower() + '.s']
 

bsp/stm32f4xx-HAL/applications/main.c

@@ -20,8 +20,3 @@ int main(void)
 
     return 0;
 }
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