rt-thread/bsp/gd32vf103v-eval/libraries/n22/env_Eclipse/start.S

// See LICENSE for license details.

// See LICENSE for license details.

#include "riscv_encoding.h"

	.section .init

    .weak  eclic_msip_handler
    .weak  eclic_mtip_handler
    .weak  eclic_bwei_handler
    .weak  eclic_pmovi_handler
    .weak  WWDGT_IRQHandler
    .weak  LVD_IRQHandler
    .weak  TAMPER_IRQHandler
    .weak  RTC_IRQHandler
    .weak  FMC_IRQHandler
    .weak  RCU_IRQHandler
    .weak  EXTI0_IRQHandler
    .weak  EXTI1_IRQHandler
    .weak  EXTI2_IRQHandler
    .weak  EXTI3_IRQHandler
    .weak  EXTI4_IRQHandler
    .weak  DMA0_Channel0_IRQHandler
    .weak  DMA0_Channel1_IRQHandler
    .weak  DMA0_Channel2_IRQHandler
    .weak  DMA0_Channel3_IRQHandler
    .weak  DMA0_Channel4_IRQHandler
    .weak  DMA0_Channel5_IRQHandler
    .weak  DMA0_Channel6_IRQHandler
    .weak  ADC0_1_IRQHandler
    .weak  CAN0_TX_IRQHandler
    .weak  CAN0_RX0_IRQHandler
    .weak  CAN0_RX1_IRQHandler
    .weak  CAN0_EWMC_IRQHandler
    .weak  EXTI5_9_IRQHandler
    .weak  TIMER0_BRK_IRQHandler
    .weak  TIMER0_UP_IRQHandler
    .weak  TIMER0_TRG_CMT_IRQHandler
    .weak  TIMER0_Channel_IRQHandler
    .weak  TIMER1_IRQHandler
    .weak  TIMER2_IRQHandler
    .weak  TIMER3_IRQHandler
    .weak  I2C0_EV_IRQHandler
    .weak  I2C0_ER_IRQHandler
    .weak  I2C1_EV_IRQHandler
    .weak  I2C1_ER_IRQHandler
    .weak  SPI0_IRQHandler
    .weak  SPI1_IRQHandler
    .weak  USART0_IRQHandler
    .weak  USART1_IRQHandler
    .weak  USART2_IRQHandler
    .weak  EXTI10_15_IRQHandler
    .weak  RTC_Alarm_IRQHandler
    .weak  USBFS_WKUP_IRQHandler
    .weak  EXMC_IRQHandler
    .weak  TIMER4_IRQHandler
    .weak  SPI2_IRQHandler
    .weak  UART3_IRQHandler
    .weak  UART4_IRQHandler
    .weak  TIMER5_IRQHandler
    .weak  TIMER6_IRQHandler
    .weak  DMA1_Channel0_IRQHandler
    .weak  DMA1_Channel1_IRQHandler
    .weak  DMA1_Channel2_IRQHandler
    .weak  DMA1_Channel3_IRQHandler
    .weak  DMA1_Channel4_IRQHandler
    .weak  CAN1_TX_IRQHandler
    .weak  CAN1_RX0_IRQHandler
    .weak  CAN1_RX1_IRQHandler
    .weak  CAN1_EWMC_IRQHandler
    .weak  USBFS_IRQHandler


vector_base:
    j _start
    .align    2
    .word     0
    .word     0
    .word     eclic_msip_handler
    .word     0
    .word     0
    .word  	  0
    .word  	  eclic_mtip_handler
    .word  	  0
    .word  	  0
    .word  	  0
    .word  	  0
    .word  	  0
    .word  	  0
    .word  	  0
    .word 	  0
    .word  	  0
    .word  	  eclic_bwei_handler
    .word  	  eclic_pmovi_handler
    .word  	  WWDGT_IRQHandler
	.word     LVD_IRQHandler
	.word     TAMPER_IRQHandler
	.word     RTC_IRQHandler
	.word     FMC_IRQHandler
	.word     RCU_IRQHandler
	.word     EXTI0_IRQHandler
	.word     EXTI1_IRQHandler
	.word     EXTI2_IRQHandler
	.word     EXTI3_IRQHandler
	.word     EXTI4_IRQHandler
	.word     DMA0_Channel0_IRQHandler
	.word     DMA0_Channel1_IRQHandler
	.word     DMA0_Channel2_IRQHandler
	.word     DMA0_Channel3_IRQHandler
	.word     DMA0_Channel4_IRQHandler
	.word     DMA0_Channel5_IRQHandler
	.word     DMA0_Channel6_IRQHandler
	.word     ADC0_1_IRQHandler
	.word     CAN0_TX_IRQHandler
	.word     CAN0_RX0_IRQHandler
	.word     CAN0_RX1_IRQHandler
	.word     CAN0_EWMC_IRQHandler
	.word     EXTI5_9_IRQHandler
	.word     TIMER0_BRK_IRQHandler
	.word     TIMER0_UP_IRQHandler
	.word     TIMER0_TRG_CMT_IRQHandler
	.word     TIMER0_Channel_IRQHandler
	.word     TIMER1_IRQHandler
	.word     TIMER2_IRQHandler
	.word     TIMER3_IRQHandler
	.word     I2C0_EV_IRQHandler
	.word     I2C0_ER_IRQHandler
	.word     I2C1_EV_IRQHandler
	.word     I2C1_ER_IRQHandler
	.word     SPI0_IRQHandler
	.word     SPI1_IRQHandler
	.word     USART0_IRQHandler
	.word     USART1_IRQHandler
	.word     USART2_IRQHandler
	.word     EXTI10_15_IRQHandler
	.word     RTC_Alarm_IRQHandler
	.word     USBFS_WKUP_IRQHandler
    .word     0
    .word     0
    .word     0
    .word     0
	.word     0
	.word     EXMC_IRQHandler
	.word     0
	.word     TIMER4_IRQHandler
	.word     SPI2_IRQHandler
	.word     UART3_IRQHandler
	.word     UART4_IRQHandler
	.word     TIMER5_IRQHandler
	.word     TIMER6_IRQHandler
	.word     DMA1_Channel0_IRQHandler
	.word     DMA1_Channel1_IRQHandler
	.word     DMA1_Channel2_IRQHandler
	.word     DMA1_Channel3_IRQHandler
	.word     DMA1_Channel4_IRQHandler
    .word     0
    .word     0
	.word     CAN1_TX_IRQHandler
	.word     CAN1_RX0_IRQHandler
	.word     CAN1_RX1_IRQHandler
	.word     CAN1_EWMC_IRQHandler
	.word     USBFS_IRQHandler

	.globl _start
	.type _start,@function

_start:

	/* Jump to logical address first to ensure correct operation of RAM region  */
    la		a0,	_start
    li		a1,	1
	slli	a1,	a1, 29
    bleu	a1, a0, _start0800
    srli	a1,	a1, 2
    bleu	a1, a0, _start0800
    la		a0,	_start0800
    add		a0, a0, a1
	jr      a0

_start0800:

    /* Set the the NMI base to share with mtvec by setting CSR_MMISC_CTL */
    li t0, 0x200
    csrs CSR_MMISC_CTL, t0

	/* Intial the mtvt*/
    la t0, vector_base
    csrw CSR_MTVT, t0

	/* Intial the mtvt2 and enable it*/
    la t0, irq_entry
    csrw CSR_MIRQ_ENTRY, t0
    csrs CSR_MIRQ_ENTRY, 0x1

    /* Intial the CSR MTVEC for the Trap ane NMI base addr*/
    la t0, trap_entry
    csrw CSR_MTVEC, t0

#ifdef __riscv_flen
	/* Enable FPU */
	li t0, MSTATUS_FS
	csrs mstatus, t0
	csrw fcsr, x0
#endif

.option push
.option norelax
	la gp, __global_pointer$
.option pop
	la sp, _sp

	/* Load data section */
	la a0, _data_lma
	la a1, _data
	la a2, _edata
	bgeu a1, a2, 2f
1:
	lw t0, (a0)
	sw t0, (a1)
	addi a0, a0, 4
	addi a1, a1, 4
	bltu a1, a2, 1b
2:
	/* Clear bss section */
	la a0, __bss_start
	la a1, _end
	bgeu a0, a1, 2f
1:
	sw zero, (a0)
	addi a0, a0, 4
	bltu a0, a1, 1b
2:
	/* Call global constructors */
	la a0, __libc_fini_array
	call atexit
	call __libc_init_array


	/* argc = argv = 0 */
	li a0, 0
	li a1, 0
	call entry
	/* tail exit */

1:
	j 1b