;/*!
;    \file    startup_gd32f450.S
;    \brief   start up file
;
;    \version 2016-08-15, V1.0.0, firmware for GD32F4xx
;    \version 2018-12-12, V2.0.0, firmware for GD32F4xx
;*/
;
;/*
;    Copyright (c) 2018, GigaDevice Semiconductor Inc.
;
;    All rights reserved.
;
;    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 the copyright holder 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-m4
.fpu softvfp
.thumb

.global VecTab
.global Default_Handler

/* start address of the initialization .data */
.word _sidata
/* start address of the .data section */ 
.word _sdata
/* end address of the .data section */
.word _edata
/* start address of the .bss section */
.word  _sbss
/* end address of the .bss section */
.word  _ebss

/* reset Handler */
  .section .text.Reset_Handler
  .weak Reset_Handler
  .type Reset_Handler, %function
Reset_Handler:
  ldr   r0, =_estack
  mov   sp, r0          /* set stack pointer */

/* copy the data segment into RAM */
  movs r1, #0
  b DataInit

CopyData:
  ldr r3, =_sidata
  ldr r3, [r3, r1]
  str r3, [r0, r1]
  adds r1, r1, #4

DataInit:
  ldr r0, =_sdata
  ldr r3, =_edata
  adds r2, r0, r1
  cmp r2, r3
  bcc CopyData
  ldr r2, =_sbss
  b  LoopZeroFill
  
/* Zero fill the bss segment. */
ZeroFill:
  movs r3, #0
  str r3, [r2], #4

LoopZeroFill:
  ldr  r3, = _ebss
  cmp  r2, r3
  bcc  ZeroFill

/* system clock intitialization*/
    bl  SystemInit
/* static constructors */
//  bl __libc_init_array
/* jump to application's entry point */
  bl  main

  bx lr


.size Reset_Handler, .-Reset_Handler

    .section .text.Default_Handler,"ax",%progbits
Default_Handler:
/* infinite loop */
  b .
  .size Default_Handler, .-Default_Handler

  .section .isr_vector,"a",%progbits
  .type VecTab, %object
  .size VecTab, .-VecTab

VecTab:
                .word    _estack                           /* Top of Stack */
                .word    Reset_Handler                     /* Reset Handler */
                .word    NMI_Handler                       /* NMI Handler */
                .word    HardFault_Handler                 /* Hard Fault Handler */
                .word    MemManage_Handler                 /* MPU Fault Handler */
                .word    BusFault_Handler                  /* Bus Fault Handler */
                .word    UsageFault_Handler                /* Usage Fault Handler */
                .word    0                                 /* Reserved */
                .word    0                                 /* Reserved */
                .word    0                                 /* Reserved */
                .word    0                                 /* Reserved */
                .word    SVC_Handler                       /* SVCall Handler */
                .word    DebugMon_Handler                  /* Debug Monitor Handler */
                .word    0                                 /* Reserved */
                .word    PendSV_Handler                    /* PendSV Handler */
                .word    SysTick_Handler                   /* SysTick Handler */

                /* external interrupts handler */
                .word    WWDGT_IRQHandler                  /* 16:Window Watchdog Timer */
                .word    LVD_IRQHandler                    /* 17:LVD through EXTI Line detect */
                .word    TAMPER_STAMP_IRQHandler           /* 18:Tamper and TimeStamp through EXTI Line detect */
                .word    RTC_WKUP_IRQHandler               /* 19:RTC Wakeup through EXTI Line */
                .word    FMC_IRQHandler                    /* 20:FMC */
                .word    RCU_CTC_IRQHandler                /* 21:RCU and CTC */
                .word    EXTI0_IRQHandler                  /* 22:EXTI Line 0 */
                .word    EXTI1_IRQHandler                  /* 23:EXTI Line 1 */
                .word    EXTI2_IRQHandler                  /* 24:EXTI Line 2 */
                .word    EXTI3_IRQHandler                  /* 25:EXTI Line 3 */
                .word    EXTI4_IRQHandler                  /* 26:EXTI Line 4 */
                .word    DMA0_Channel0_IRQHandler          /* 27:DMA0 Channel0 */
                .word    DMA0_Channel1_IRQHandler          /* 28:DMA0 Channel1 */
                .word    DMA0_Channel2_IRQHandler          /* 29:DMA0 Channel2 */
                .word    DMA0_Channel3_IRQHandler          /* 30:DMA0 Channel3 */
                .word    DMA0_Channel4_IRQHandler          /* 31:DMA0 Channel4 */
                .word    DMA0_Channel5_IRQHandler          /* 32:DMA0 Channel5 */
                .word    DMA0_Channel6_IRQHandler          /* 33:DMA0 Channel6 */
                .word    ADC_IRQHandler                    /* 34:ADC */
                .word    CAN0_TX_IRQHandler                /* 35:CAN0 TX */
                .word    CAN0_RX0_IRQHandler               /* 36:CAN0 RX0 */
                .word    CAN0_RX1_IRQHandler               /* 37:CAN0 RX1 */
                .word    CAN0_EWMC_IRQHandler              /* 38:CAN0 EWMC */
                .word    EXTI5_9_IRQHandler                /* 39:EXTI5 to EXTI9 */
                .word    TIMER0_BRK_TIMER8_IRQHandler      /* 40:TIMER0 Break and TIMER8 */
                .word    TIMER0_UP_TIMER9_IRQHandler       /* 41:TIMER0 Update and TIMER9 */
                .word    TIMER0_TRG_CMT_TIMER10_IRQHandler /* 42:TIMER0 Trigger and Commutation and TIMER10 */
                .word    TIMER0_Channel_IRQHandler         /* 43:TIMER0 Capture Compare */
                .word    TIMER1_IRQHandler                 /* 44:TIMER1 */
                .word    TIMER2_IRQHandler                 /* 45:TIMER2 */
                .word    TIMER3_IRQHandler                 /* 46:TIMER3 */
                .word    I2C0_EV_IRQHandler                /* 47:I2C0 Event */
                .word    I2C0_ER_IRQHandler                /* 48:I2C0 Error */
                .word    I2C1_EV_IRQHandler                /* 49:I2C1 Event */
                .word    I2C1_ER_IRQHandler                /* 50:I2C1 Error */
                .word    SPI0_IRQHandler                   /* 51:SPI0 */
                .word    SPI1_IRQHandler                   /* 52:SPI1 */
                .word    USART0_IRQHandler                 /* 53:USART0 */
                .word    USART1_IRQHandler                 /* 54:USART1 */
                .word    USART2_IRQHandler                 /* 55:USART2 */
                .word    EXTI10_15_IRQHandler              /* 56:EXTI10 to EXTI15 */
                .word    RTC_Alarm_IRQHandler              /* 57:RTC Alarm */
                .word    USBFS_WKUP_IRQHandler             /* 58:USBFS Wakeup */
                .word    TIMER7_BRK_TIMER11_IRQHandler     /* 59:TIMER7 Break and TIMER11 */
                .word    TIMER7_UP_TIMER12_IRQHandler      /* 60:TIMER7 Update and TIMER12 */
                .word    TIMER7_TRG_CMT_TIMER13_IRQHandler /* 61:TIMER7 Trigger and Commutation and TIMER13 */
                .word    TIMER7_Channel_IRQHandler         /* 62:TIMER7 Channel Capture Compare */
                .word    DMA0_Channel7_IRQHandler          /* 63:DMA0 Channel7 */
                .word    EXMC_IRQHandler                   /* 64:EXMC */
                .word    SDIO_IRQHandler                   /* 65:SDIO */
                .word    TIMER4_IRQHandler                 /* 66:TIMER4 */
                .word    SPI2_IRQHandler                   /* 67:SPI2 */
                .word    UART3_IRQHandler                  /* 68:UART3 */
                .word    UART4_IRQHandler                  /* 69:UART4 */
                .word    TIMER5_DAC_IRQHandler             /* 70:TIMER5 and DAC0 DAC1 Underrun error */
                .word    TIMER6_IRQHandler                 /* 71:TIMER6 */
                .word    DMA1_Channel0_IRQHandler          /* 72:DMA1 Channel0 */
                .word    DMA1_Channel1_IRQHandler          /* 73:DMA1 Channel1 */
                .word    DMA1_Channel2_IRQHandler          /* 74:DMA1 Channel2 */
                .word    DMA1_Channel3_IRQHandler          /* 75:DMA1 Channel3 */
                .word    DMA1_Channel4_IRQHandler          /* 76:DMA1 Channel4 */
                .word    ENET_IRQHandler                   /* 77:Ethernet */
                .word    ENET_WKUP_IRQHandler              /* 78:Ethernet Wakeup through EXTI Line */
                .word    CAN1_TX_IRQHandler                /* 79:CAN1 TX */
                .word    CAN1_RX0_IRQHandler               /* 80:CAN1 RX0 */
                .word    CAN1_RX1_IRQHandler               /* 81:CAN1 RX1 */
                .word    CAN1_EWMC_IRQHandler              /* 82:CAN1 EWMC */
                .word    USBFS_IRQHandler                  /* 83:USBFS */
                .word    DMA1_Channel5_IRQHandler          /* 84:DMA1 Channel5 */
                .word    DMA1_Channel6_IRQHandler          /* 85:DMA1 Channel6 */
                .word    DMA1_Channel7_IRQHandler          /* 86:DMA1 Channel7 */
                .word    USART5_IRQHandler                 /* 87:USART5 */
                .word    I2C2_EV_IRQHandler                /* 88:I2C2 Event */
                .word    I2C2_ER_IRQHandler                /* 89:I2C2 Error */
                .word    USBHS_EP1_Out_IRQHandler          /* 90:USBHS Endpoint 1 Out */
                .word    USBHS_EP1_In_IRQHandler           /* 91:USBHS Endpoint 1 in */
                .word    USBHS_WKUP_IRQHandler             /* 92:USBHS Wakeup through EXTI Line */
                .word    USBHS_IRQHandler                  /* 93:USBHS */
                .word    DCI_IRQHandler                    /* 94:DCI */
                .word    0                                 /* 95:Reserved */
                .word    TRNG_IRQHandler                   /* 96:TRNG */
                .word    FPU_IRQHandler                    /* 97:FPU */
                .word    UART6_IRQHandler                  /* 98:UART6 */
                .word    UART7_IRQHandler                  /* 99:UART7 */
                .word    SPI3_IRQHandler                   /* 100:SPI3 */
                .word    SPI4_IRQHandler                   /* 101:SPI4 */
                .word    SPI5_IRQHandler                   /* 102:SPI5 */
                .word    0                                 /* 103:Reserved */
                .word    TLI_IRQHandler                    /* 104:TLI */
                .word    TLI_ER_IRQHandler                 /* 105:TLI Error */
                .word    IPA_IRQHandler                    /* 106:IPA */

/* dummy Exception Handlers */
  .weak NMI_Handler
  .thumb_set NMI_Handler,Default_Handler

  .weak HardFault_Handler
  .thumb_set HardFault_Handler,Default_Handler

  .weak MemManage_Handler
  .thumb_set MemManage_Handler,Default_Handler

  .weak BusFault_Handler
  .thumb_set BusFault_Handler,Default_Handler
  
  .weak UsageFault_Handler
  .thumb_set UsageFault_Handler,Default_Handler
  
  .weak SVC_Handler
  .thumb_set SVC_Handler,Default_Handler
  
  .weak DebugMon_Handler
  .thumb_set DebugMon_Handler,Default_Handler
  
  .weak PendSV_Handler
  .thumb_set PendSV_Handler,Default_Handler

  .weak SysTick_Handler
  .thumb_set SysTick_Handler,Default_Handler

  .weak WWDGT_IRQHandler
  .thumb_set WWDGT_IRQHandler,Default_Handler
  
  .weak LVD_IRQHandler
  .thumb_set LVD_IRQHandler,Default_Handler
  
  .weak TAMPER_STAMP_IRQHandler
  .thumb_set TAMPER_STAMP_IRQHandler,Default_Handler
  
  .weak RTC_WKUP_IRQHandler
  .thumb_set RTC_WKUP_IRQHandler,Default_Handler
  
  .weak FMC_IRQHandler
  .thumb_set FMC_IRQHandler,Default_Handler
  
  .weak RCU_CTC_IRQHandler
  .thumb_set RCU_CTC_IRQHandler,Default_Handler
  
  .weak EXTI0_IRQHandler
  .thumb_set EXTI0_IRQHandler,Default_Handler
  
  .weak EXTI1_IRQHandler
  .thumb_set EXTI1_IRQHandler,Default_Handler
  
  .weak EXTI2_IRQHandler
  .thumb_set EXTI2_IRQHandler,Default_Handler
  
  .weak EXTI3_IRQHandler
  .thumb_set EXTI3_IRQHandler,Default_Handler
  
  .weak EXTI4_IRQHandler
  .thumb_set EXTI4_IRQHandler,Default_Handler
  
  .weak DMA0_Channel0_IRQHandler
  .thumb_set DMA0_Channel0_IRQHandler,Default_Handler
  
  .weak DMA0_Channel1_IRQHandler
  .thumb_set DMA0_Channel1_IRQHandler,Default_Handler
  
  .weak DMA0_Channel2_IRQHandler
  .thumb_set DMA0_Channel2_IRQHandler,Default_Handler
  
  .weak DMA0_Channel3_IRQHandler
  .thumb_set DMA0_Channel3_IRQHandler,Default_Handler
  
  .weak DMA0_Channel4_IRQHandler
  .thumb_set DMA0_Channel4_IRQHandler,Default_Handler
  
  .weak DMA0_Channel5_IRQHandler
  .thumb_set DMA0_Channel5_IRQHandler,Default_Handler
  
  .weak DMA0_Channel6_IRQHandler
  .thumb_set DMA0_Channel6_IRQHandler,Default_Handler
  
  .weak ADC_IRQHandler
  .thumb_set ADC_IRQHandler,Default_Handler
  
  .weak CAN0_TX_IRQHandler
  .thumb_set CAN0_TX_IRQHandler,Default_Handler
  
  .weak CAN0_RX0_IRQHandler
  .thumb_set CAN0_RX0_IRQHandler,Default_Handler
  
  .weak CAN0_RX1_IRQHandler
  .thumb_set CAN0_RX1_IRQHandler,Default_Handler
  
  .weak CAN0_EWMC_IRQHandler
  .thumb_set CAN0_EWMC_IRQHandler,Default_Handler
  
  .weak EXTI5_9_IRQHandler
  .thumb_set EXTI5_9_IRQHandler,Default_Handler
  
  .weak TIMER0_BRK_TIMER8_IRQHandler
  .thumb_set TIMER0_BRK_TIMER8_IRQHandler,Default_Handler
  
  .weak TIMER0_UP_TIMER9_IRQHandler
  .thumb_set TIMER0_UP_TIMER9_IRQHandler,Default_Handler
  
  .weak TIMER0_TRG_CMT_TIMER10_IRQHandler
  .thumb_set TIMER0_TRG_CMT_TIMER10_IRQHandler,Default_Handler
  
  .weak TIMER0_Channel_IRQHandler
  .thumb_set TIMER0_Channel_IRQHandler,Default_Handler
  
  .weak TIMER1_IRQHandler
  .thumb_set TIMER1_IRQHandler,Default_Handler
  
  .weak TIMER2_IRQHandler
  .thumb_set TIMER2_IRQHandler,Default_Handler
  
  .weak TIMER3_IRQHandler
  .thumb_set TIMER3_IRQHandler,Default_Handler
  
  .weak I2C0_EV_IRQHandler
  .thumb_set I2C0_EV_IRQHandler,Default_Handler
  
  .weak I2C0_ER_IRQHandler
  .thumb_set I2C0_ER_IRQHandler,Default_Handler
  
  .weak I2C1_EV_IRQHandler
  .thumb_set I2C1_EV_IRQHandler,Default_Handler
  
  .weak I2C1_ER_IRQHandler
  .thumb_set I2C1_ER_IRQHandler,Default_Handler
  
  .weak SPI0_IRQHandler
  .thumb_set SPI0_IRQHandler,Default_Handler
  
  .weak SPI1_IRQHandler
  .thumb_set SPI1_IRQHandler,Default_Handler
  
  .weak USART0_IRQHandler
  .thumb_set USART0_IRQHandler,Default_Handler
  
  .weak USART1_IRQHandler
  .thumb_set USART1_IRQHandler,Default_Handler
  
  .weak USART2_IRQHandler
  .thumb_set USART2_IRQHandler,Default_Handler
  
  .weak EXTI10_15_IRQHandler
  .thumb_set EXTI10_15_IRQHandler,Default_Handler
  
  .weak RTC_Alarm_IRQHandler
  .thumb_set RTC_Alarm_IRQHandler,Default_Handler
  
  .weak USBFS_WKUP_IRQHandler
  .thumb_set USBFS_WKUP_IRQHandler,Default_Handler
  
  .weak TIMER7_BRK_TIMER11_IRQHandler
  .thumb_set TIMER7_BRK_TIMER11_IRQHandler,Default_Handler
  
  .weak TIMER7_UP_TIMER12_IRQHandler
  .thumb_set TIMER7_UP_TIMER12_IRQHandler,Default_Handler
  
  .weak TIMER7_TRG_CMT_TIMER13_IRQHandler
  .thumb_set TIMER7_TRG_CMT_TIMER13_IRQHandler,Default_Handler
  
  .weak TIMER7_Channel_IRQHandler
  .thumb_set TIMER7_Channel_IRQHandler,Default_Handler
  
  .weak DMA0_Channel7_IRQHandler
  .thumb_set DMA0_Channel7_IRQHandler,Default_Handler
  
  .weak EXMC_IRQHandler
  .thumb_set EXMC_IRQHandler,Default_Handler
  
  .weak SDIO_IRQHandler
  .thumb_set SDIO_IRQHandler,Default_Handler
  
  .weak TIMER4_IRQHandler
  .thumb_set TIMER4_IRQHandler,Default_Handler
  
  .weak SPI2_IRQHandler
  .thumb_set SPI2_IRQHandler,Default_Handler
  
  .weak UART3_IRQHandler
  .thumb_set UART3_IRQHandler,Default_Handler
  
  .weak UART4_IRQHandler
  .thumb_set UART4_IRQHandler,Default_Handler
  
  .weak TIMER5_DAC_IRQHandler
  .thumb_set TIMER5_DAC_IRQHandler,Default_Handler
  
  .weak TIMER6_IRQHandler
  .thumb_set TIMER6_IRQHandler,Default_Handler
  
  .weak DMA1_Channel0_IRQHandler
  .thumb_set DMA1_Channel0_IRQHandler,Default_Handler
  
  .weak DMA1_Channel1_IRQHandler
  .thumb_set DMA1_Channel1_IRQHandler,Default_Handler
  
  .weak DMA1_Channel2_IRQHandler
  .thumb_set DMA1_Channel2_IRQHandler,Default_Handler
  
  .weak DMA1_Channel3_IRQHandler
  .thumb_set DMA1_Channel3_IRQHandler,Default_Handler
  
  .weak DMA1_Channel4_IRQHandler
  .thumb_set DMA1_Channel4_IRQHandler,Default_Handler
  
  .weak ENET_IRQHandler
  .thumb_set ENET_IRQHandler,Default_Handler
  
  .weak ENET_WKUP_IRQHandler
  .thumb_set ENET_WKUP_IRQHandler,Default_Handler
  
  .weak CAN1_TX_IRQHandler
  .thumb_set CAN1_TX_IRQHandler,Default_Handler
  
  .weak CAN1_RX0_IRQHandler
  .thumb_set CAN1_RX0_IRQHandler,Default_Handler
  
  .weak CAN1_RX1_IRQHandler
  .thumb_set CAN1_RX1_IRQHandler,Default_Handler
  
  .weak CAN1_EWMC_IRQHandler
  .thumb_set CAN1_EWMC_IRQHandler,Default_Handler
  
  .weak USBFS_IRQHandler
  .thumb_set USBFS_IRQHandler,Default_Handler
  
  .weak DMA1_Channel5_IRQHandler
  .thumb_set DMA1_Channel5_IRQHandler,Default_Handler
  
  .weak DMA1_Channel6_IRQHandler
  .thumb_set DMA1_Channel6_IRQHandler,Default_Handler
  
  .weak DMA1_Channel7_IRQHandler
  .thumb_set DMA1_Channel7_IRQHandler,Default_Handler
  
  .weak USART5_IRQHandler
  .thumb_set USART5_IRQHandler,Default_Handler
  
  .weak I2C2_EV_IRQHandler
  .thumb_set I2C2_EV_IRQHandler,Default_Handler
  
  .weak I2C2_ER_IRQHandler
  .thumb_set I2C2_ER_IRQHandler,Default_Handler
  
  .weak USBHS_EP1_Out_IRQHandler
  .thumb_set USBHS_EP1_Out_IRQHandler,Default_Handler
  
  .weak USBHS_EP1_In_IRQHandler
  .thumb_set USBHS_EP1_In_IRQHandler,Default_Handler
  
  .weak USBHS_WKUP_IRQHandler
  .thumb_set USBHS_WKUP_IRQHandler,Default_Handler
  
  .weak USBHS_IRQHandler
  .thumb_set USBHS_IRQHandler,Default_Handler
  
  .weak DCI_IRQHandler
  .thumb_set DCI_IRQHandler,Default_Handler
  
  .weak TRNG_IRQHandler
  .thumb_set TRNG_IRQHandler,Default_Handler
  
  .weak FPU_IRQHandler
  .thumb_set FPU_IRQHandler,Default_Handler
  
  .weak UART6_IRQHandler
  .thumb_set UART6_IRQHandler,Default_Handler
  
  .weak UART7_IRQHandler
  .thumb_set UART7_IRQHandler,Default_Handler
  
  .weak SPI3_IRQHandler
  .thumb_set SPI3_IRQHandler,Default_Handler
  
  .weak SPI4_IRQHandler
  .thumb_set SPI4_IRQHandler,Default_Handler
  
  .weak SPI5_IRQHandler
  .thumb_set SPI5_IRQHandler,Default_Handler
  
  .weak TLI_IRQHandler
  .thumb_set TLI_IRQHandler,Default_Handler
  
  .weak TLI_ER_IRQHandler
  .thumb_set TLI_ER_IRQHandler,Default_Handler
  
  .weak IPA_IRQHandler
  .thumb_set IPA_IRQHandler,Default_Handler
