编译器的iar EWARM，
uCosII 通过初始化下面的向量表，在程序复位时将程序定位到__program_start（void)函数，但该函数是个空函数呀，程序到底是怎么进行到正常状态的呢？请大虾们指点。
另外，向量表__vector_table[] 的第一行{ .__ptr = __sfe( "CSTACK" ) },是什么意思呀？
下面是uCosII 自带的向量初始化文件‘app_vect.c’的完整内容：
/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_vector.c
* Author : MCD Application Team
* Version : V2.0.3
* Date : 09/22/2008
* Description : STM32F10x vector table for EWARM4.x toolchain.
* This module performs:
* - Set the initial SP
* - Set the initial PC == __program_start,
* - Set the vector table entries with the exceptions ISR address,
* - Configure external SRAM mounted on STM3210E-EVAL board
* to be used as data memory (optional, to be enabled by user)
* After Reset the Cortex-M3 processor is in Thread mode,
* priority is Privileged, and the Stack is set to Main.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "stm32f10x_it.h"
/* Private typedef -----------------------------------------------------------*/
typedef void( *intfunc )( void );
typedef union { intfunc __fun; void * __ptr; } intvec_elem;
/* Private define ------------------------------------------------------------*/
/* Uncomment the following line if you need to use external SRAM mounted on
STM3210E-EVAL board as data memory */
/* #define DATA_IN_ExtSRAM */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
#pragma language=extended
#pragma segment="CSTACK"
void __program_start( void );
#pragma location = "INTVEC"
/* STM32F10x Vector Table entries */
const intvec_elem __vector_table[] =
{
{ .__ptr = __sfe( "CSTACK" ) },
__program_start,
NMIException,
HardFaultException,
MemManageException,
BusFaultException,
UsageFaultException,
0, 0, 0, 0, /* Reserved */
SVCHandler,
DebugMonitor,
0, /* Reserved */
PendSVC,
SysTickHandler,
WWDG_IRQHandler,
PVD_IRQHandler,
TAMPER_IRQHandler,
RTC_IRQHandler,
FLASH_IRQHandler,
RCC_IRQHandler,
EXTI0_IRQHandler,
EXTI1_IRQHandler,
EXTI2_IRQHandler,
EXTI3_IRQHandler,
EXTI4_IRQHandler,
DMA1_Channel1_IRQHandler,
DMA1_Channel2_IRQHandler,
DMA1_Channel3_IRQHandler,
DMA1_Channel4_IRQHandler,
DMA1_Channel5_IRQHandler,
DMA1_Channel6_IRQHandler,
DMA1_Channel7_IRQHandler,
ADC1_2_IRQHandler,
USB_HP_CAN_TX_IRQHandler,
USB_LP_CAN_RX0_IRQHandler,
CAN_RX1_IRQHandler,
CAN_SCE_IRQHandler,
EXTI9_5_IRQHandler,
TIM1_BRK_IRQHandler,
TIM1_UP_IRQHandler,
TIM1_TRG_COM_IRQHandler,
TIM1_CC_IRQHandler,
TIM2_IRQHandler,
TIM3_IRQHandler,
TIM4_IRQHandler,
I2C1_EV_IRQHandler,
I2C1_ER_IRQHandler,
I2C2_EV_IRQHandler,
I2C2_ER_IRQHandler,
SPI1_IRQHandler,
SPI2_IRQHandler,
USART1_IRQHandler,
USART2_IRQHandler,
USART3_IRQHandler,
EXTI15_10_IRQHandler,
RTCAlarm_IRQHandler,
USBWakeUp_IRQHandler,
TIM8_BRK_IRQHandler,
TIM8_UP_IRQHandler,
TIM8_TRG_COM_IRQHandler,
TIM8_CC_IRQHandler,
ADC3_IRQHandler,
FSMC_IRQHandler,
SDIO_IRQHandler,
TIM5_IRQHandler,
SPI3_IRQHandler,
UART4_IRQHandler,
UART5_IRQHandler,
TIM6_IRQHandler,
TIM7_IRQHandler,
DMA2_Channel1_IRQHandler,
DMA2_Channel2_IRQHandler,
DMA2_Channel3_IRQHandler,
DMA2_Channel4_5_IRQHandler,
};
#ifdef DATA_IN_ExtSRAM
#pragma language=extended
__interwork int __low_level_init(void);
#pragma location="ICODE"
__interwork int __low_level_init(void)
{
/* FSMC Bank1 NOR/SRAM3 is used for the STM3210E-EVAL, if another Bank is
required, then adjust the Register Addresses*/
/* Enable FSMC clock */
*(vu32 *)0x40021014 = 0x00000114;
/* Enable GPIOD, GPIOE, GPIOF and GPIOG clocks */
*(vu32 *)0x40021018 = 0x000001E0;
/* --------------- SRAM Data lines, NOE and NWE configuration ---------------*/
/*---------------- SRAM Address lines configuration -------------------------*/
/*---------------- NOE and NWE configuration --------------------------------*/
/*---------------- NE3 configuration ----------------------------------------*/
/*---------------- NBL0, NBL1 configuration ---------------------------------*/
*(vu32 *)0x40011400 = 0x44BB44BB;
*(vu32 *)0x40011404 = 0xBBBBBBBB;
*(vu32 *)0x40011800 = 0xB44444BB;
*(vu32 *)0x40011804 = 0xBBBBBBBB;
*(vu32 *)0x40011C00 = 0x44BBBBBB;
*(vu32 *)0x40011C04 = 0xBBBB4444;
*(vu32 *)0x40012000 = 0x44BBBBBB;
*(vu32 *)0x40012004 = 0x44444B44;
/*---------------- FSMC Configuration ---------------------------------------*/
/*---------------- Enable FSMC Bank1_SRAM Bank ------------------------------*/
*(vu32 *)0xA0000010 = 0x00001011;
*(vu32 *)0xA0000014 = 0x00000200;
return (1);
}
#endif /*DATA_IN_ExtSRAM*/
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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