解析STM32启动过程
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相对于ARM上一代的主流ARM7/ARM9内核架构，新一代Cortex内核架构的启动方式有了比较大的变化。ARM7/ARM9内核的控制器在复位后，CPU会从存储
空间的绝对地址0x000000取出第一条指令执行复位中断服务程序的方式启动，即固定了复位后的起始地址为0x000000（PC = 0x000000）同时中断向量表
的位置并不是固定的。而Cortex-M3内核则正好相反，有3种情况:
1、通过boot引脚设置可以将中断向量表定位于SRAM区，即起始地址为0x2000000，同时复位后PC指针位于0x2000000处；
2、通过boot引脚设置可以将中断向量表定位于FLASH区，即起始地址为0x8000000，同时复位后PC指针位于0x8000000处；
3、通过boot引脚设置可以将中断向量表定位于内置Bootloader区，本文不对这种情况做论述；
而Cortex-M3内核规定，起始地址必须存放堆顶指针，而第二个地址则必须存放复位中断入口向量地址，这样在Cortex-M3内核复位后，会自动从起始地址
的下一个32位空间取出复位中断入口向量，跳转执行复位中断服务程序。对比ARM7/ARM9内核，Cortex-M3内核则是固定了中断向量表的位置而起始地址
是可变化的。
有了上述准备只是后，下面以STM32的2.02固件库提供的启动文件“stm32f10x_vector.s”为模板，对STM32的启动过程做一个简要而全面的解析。
程序清单一：
；文件“stm32f10x_vector.s”，其中注释为行号
DATA_IN_ExtSRAMEQU0；1
Stack_SizeEQU0x00000400；2
AREASTACK,NOINIT,READWRITE,ALIGN=3；3
Stack_MemSPACEStack_Size；4
__initial_sp；5
Heap_SizeEQU0x00000400；6
AREAHEAP,NOINIT,READWRITE,ALIGN=3；7
__heap_base；8
Heap_MemSPACEHeap_Size；9
__heap_limit；10
THUMB；11
PRESERVE8；12
IMPORTNMIException；13
IMPORTHardFaultException；14
IMPORTMemManageException；15
IMPORTBusFaultException；16
IMPORTUsageFaultException；17
IMPORTSVCHandler；18
IMPORTDebugMonitor；19
IMPORTPendSVC；20
IMPORTSysTickHandler；21
IMPORTWWDG_IRQHandler；22
IMPORTPVD_IRQHandler；23
IMPORTTAMPER_IRQHandler；24
IMPORTRTC_IRQHandler；25
IMPORTFLASH_IRQHandler；26
IMPORTRCC_IRQHandler；27
IMPORTEXTI0_IRQHandler；28
IMPORTEXTI1_IRQHandler；29
IMPORTEXTI2_IRQHandler；30
IMPORTEXTI3_IRQHandler；31
IMPORTEXTI4_IRQHandler；32
IMPORTDMA1_Channel1_IRQHandler；33
IMPORTDMA1_Channel2_IRQHandler；34
IMPORTDMA1_Channel3_IRQHandler；35
IMPORTDMA1_Channel4_IRQHandler；36
IMPORTDMA1_Channel5_IRQHandler；37
IMPORTDMA1_Channel6_IRQHandler；38
IMPORTDMA1_Channel7_IRQHandler；39
IMPORTADC1_2_IRQHandler；40
IMPORTUSB_HP_CAN_TX_IRQHandler；41
IMPORTUSB_LP_CAN_RX0_IRQHandler；42
IMPORTCAN_RX1_IRQHandler；43
IMPORTCAN_SCE_IRQHandler；44
IMPORTEXTI9_5_IRQHandler；45
IMPORTTIM1_BRK_IRQHandler；46
IMPORTTIM1_UP_IRQHandler；47
IMPORTTIM1_TRG_COM_IRQHandler；48
IMPORTTIM1_CC_IRQHandler；49
IMPORTTIM2_IRQHandler；50
IMPORTTIM3_IRQHandler；51
IMPORTTIM4_IRQHandler；52
IMPORTI2C1_EV_IRQHandler；53
IMPORTI2C1_ER_IRQHandler；54
IMPORTI2C2_EV_IRQHandler；55
IMPORTI2C2_ER_IRQHandler；56
IMPORTSPI1_IRQHandler；57
IMPORTSPI2_IRQHandler；58
IMPORTUSART1_IRQHandler；59
IMPORTUSART2_IRQHandler；60
IMPORTUSART3_IRQHandler；61
IMPORTEXTI15_10_IRQHandler；62
IMPORTRTCAlarm_IRQHandler；63
IMPORTUSBWakeUp_IRQHandler；64
IMPORTTIM8_BRK_IRQHandler；65
IMPORTTIM8_UP_IRQHandler；66
IMPORTTIM8_TRG_COM_IRQHandler；67
IMPORTTIM8_CC_IRQHandler；68
IMPORTADC3_IRQHandler；69
IMPORTFSMC_IRQHandler；70
IMPORTSDIO_IRQHandler；71
IMPORTTIM5_IRQHandler；72
IMPORTSPI3_IRQHandler；73
IMPORTUART4_IRQHandler；74
IMPORTUART5_IRQHandler；75
IMPORTTIM6_IRQHandler；76
IMPORTTIM7_IRQHandler；77
IMPORTDMA2_Channel1_IRQHandler；78
IMPORTDMA2_Channel2_IRQHandler；79
IMPORTDMA2_Channel3_IRQHandler；80
IMPORTDMA2_Channel4_5_IRQHandler；81
AREARESET,DATA,READONLY；82
EXPORT__Vectors；83
__Vectors；84
DCD__initial_sp；85
DCDReset_Handler；86
DCDNMIException；87
DCDHardFaultException；88
DCDMemManageException；89
DCDBusFaultException；90
DCDUsageFaultException；91
DCD0；92
DCD0；93
DCD0；94
DCD0；95
DCDSVCHandler；96
DCDDebugMonitor；97
DCD0；98
DCDPendSVC；99
DCDSysTickHandler；100
DCDWWDG_IRQHandler；101
DCDPVD_IRQHandler；102
DCDTAMPER_IRQHandler；103
DCDRTC_IRQHandler；104
DCDFLASH_IRQHandler；105
DCDRCC_IRQHandler；106
DCDEXTI0_IRQHandler；107
DCDEXTI1_IRQHandler；108
DCDEXTI2_IRQHandler；109
DCDEXTI3_IRQHandler；110
DCDEXTI4_IRQHandler；111
DCDDMA1_Channel1_IRQHandler；112
DCDDMA1_Channel2_IRQHandler；113
DCDDMA1_Channel3_IRQHandler；114
DCDDMA1_Channel4_IRQHandler；115
DCDDMA1_Channel5_IRQHandler；116
DCDDMA1_Channel6_IRQHandler；117
DCDDMA1_Channel7_IRQHandler；118
DCDADC1_2_IRQHandler；119
DCDUSB_HP_CAN_TX_IRQHandler；120
DCDUSB_LP_CAN_RX0_IRQHandler；121
DCDCAN_RX1_IRQHandler；122
DCDCAN_SCE_IRQHandler；123
DCDEXTI9_5_IRQHandler；124
DCDTIM1_BRK_IRQHandler；125
DCDTIM1_UP_IRQHandler；126
DCDTIM1_TRG_COM_IRQHandler；127
DCDTIM1_CC_IRQHandler；128
DCDTIM2_IRQHandler；129
DCDTIM3_IRQHandler；130
DCDTIM4_IRQHandler；131
DCDI2C1_EV_IRQHandler；132
DCDI2C1_ER_IRQHandler；133
DCDI2C2_EV_IRQHandler；134
DCDI2C2_ER_IRQHandler；135
DCDSPI1_IRQHandler；136
DCDSPI2_IRQHandler；137
DCDUSART1_IRQHandler；138
DCDUSART2_IRQHandler；139
DCDUSART3_IRQHandler；140
DCDEXTI15_10_IRQHandler；141
DCDRTCAlarm_IRQHandler；142
DCDUSBWakeUp_IRQHandler；143
DCDTIM8_BRK_IRQHandler；144
DCDTIM8_UP_IRQHandler；145
DCDTIM8_TRG_COM_IRQHandler；146
DCDTIM8_CC_IRQHandler；147
DCDADC3_IRQHandler；148
DCDFSMC_IRQHandler；149
DCDSDIO_IRQHandler；150
DCDTIM5_IRQHandler；151
DCDSPI3_IRQHandler；152
DCDUART4_IRQHandler；153
DCDUART5_IRQHandler；154
DCDTIM6_IRQHandler；155
DCDTIM7_IRQHandler；156
DCDDMA2_Channel1_IRQHandler；157
DCDDMA2_Channel2_IRQHandler；158
DCDDMA2_Channel3_IRQHandler；159
DCDDMA2_Channel4_5_IRQHandler；160
AREA|.text|,CODE,READONLY；161
Reset_HandlerPROC；162
EXPORTReset_Handler；163
IF DATA_IN_ExtSRAM ==
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