- /********************************** (C) COPYRIGHT *******************************
- * File Name : startup_ch32v10x.s
- * Author : WCH
- * Version : V1.0.0
- * Date : 2020/04/30
- * Description : CH32V10x vector table for eclipse toolchain.
- *******************************************************************************/
-
- .section .init,"ax",@progbits /* 声明section 为 .init */
- .global _start /* 指明标签_start的属性为全局性的 */
- .align 1
- _start: /* 标签_start处 */
- j handle_reset /* 跳转至 handle_reset处 */
- .word 0x00000013 /* 内核设计需要，不用关注 */
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00000013
- .word 0x00100073
- .section .vector,"ax",@progbits
- .align 1
- _vector_base: /* 中断向量表 */
- .option norvc;
- j _start
- .word 0
- j NMI_Handler /* NMI Handler */
- j HardFault_Handler /* Hard Fault Handler */
- .word 0
- .word 0
- .word 0
- .word 0
- .word 0
- .word 0
- .word 0
- .word 0
- j SysTick_Handler /* SysTick Handler */
- .word 0
- j SW_handler /* SW Handler */
- .word 0
- /* External Interrupts */
- j WWDG_IRQHandler /* Window Watchdog */
- j PVD_IRQHandler /* PVD through EXTI Line detect */
- j TAMPER_IRQHandler /* TAMPER */
- j RTC_IRQHandler /* RTC */
- j FLASH_IRQHandler /* Flash */
- j RCC_IRQHandler /* RCC */
- j EXTI0_IRQHandler /* EXTI Line 0 */
- j EXTI1_IRQHandler /* EXTI Line 1 */
- j EXTI2_IRQHandler /* EXTI Line 2 */
- j EXTI3_IRQHandler /* EXTI Line 3 */
- j EXTI4_IRQHandler /* EXTI Line 4 */
- j DMA1_Channel1_IRQHandler /* DMA1 Channel 1 */
- j DMA1_Channel2_IRQHandler /* DMA1 Channel 2 */
- j DMA1_Channel3_IRQHandler /* DMA1 Channel 3 */
- j DMA1_Channel4_IRQHandler /* DMA1 Channel 4 */
- j DMA1_Channel5_IRQHandler /* DMA1 Channel 5 */
- j DMA1_Channel6_IRQHandler /* DMA1 Channel 6 */
- j DMA1_Channel7_IRQHandler /* DMA1 Channel 7 */
- j ADC1_2_IRQHandler /* ADC1_2 */
- .word 0
- .word 0
- .word 0
- .word 0
- j EXTI9_5_IRQHandler /* EXTI Line 9..5 */
- j TIM1_BRK_IRQHandler /* TIM1 Break */
- j TIM1_UP_IRQHandler /* TIM1 Update */
- j TIM1_TRG_COM_IRQHandler /* TIM1 Trigger and Commutation */
- j TIM1_CC_IRQHandler /* TIM1 Capture Compare */
- j TIM2_IRQHandler /* TIM2 */
- j TIM3_IRQHandler /* TIM3 */
- j TIM4_IRQHandler /* TIM4 */
- j I2C1_EV_IRQHandler /* I2C1 Event */
- j I2C1_ER_IRQHandler /* I2C1 Error */
- j I2C2_EV_IRQHandler /* I2C2 Event */
- j I2C2_ER_IRQHandler /* I2C2 Error */
- j SPI1_IRQHandler /* SPI1 */
- j SPI2_IRQHandler /* SPI2 */
- j USART1_IRQHandler /* USART1 */
- j USART2_IRQHandler /* USART2 */
- j USART3_IRQHandler /* USART3 */
- j EXTI15_10_IRQHandler /* EXTI Line 15..10 */
- j RTCAlarm_IRQHandler /* RTC Alarm through EXTI Line */
- j USBWakeUp_IRQHandler /* USB Wakeup from suspend */
- j USBHD_IRQHandler /* USBHD */
-
- .option rvc;
-
- .section .text. , "ax", @progbits /* 中断服务程序弱定义 */
- .weak NMI_Handler
- .weak HardFault_Handler
- .weak SysTick_Handler
- .weak SW_handler
- .weak WWDG_IRQHandler
- .weak PVD_IRQHandler
- .weak TAMPER_IRQHandler
- .weak RTC_IRQHandler
- .weak FLASH_IRQHandler
- .weak RCC_IRQHandler
- .weak EXTI0_IRQHandler
- .weak EXTI1_IRQHandler
- .weak EXTI2_IRQHandler
- .weak EXTI3_IRQHandler
- .weak EXTI4_IRQHandler
- .weak DMA1_Channel1_IRQHandler
- .weak DMA1_Channel2_IRQHandler
- .weak DMA1_Channel3_IRQHandler
- .weak DMA1_Channel4_IRQHandler
- .weak DMA1_Channel5_IRQHandler
- .weak DMA1_Channel6_IRQHandler
- .weak DMA1_Channel7_IRQHandler
- .weak ADC1_2_IRQHandler
- .weak EXTI9_5_IRQHandler
- .weak TIM1_BRK_IRQHandler
- .weak TIM1_UP_IRQHandler
- .weak TIM1_TRG_COM_IRQHandler
- .weak TIM1_CC_IRQHandler
- .weak TIM2_IRQHandler
- .weak TIM3_IRQHandler
- .weak TIM4_IRQHandler
- .weak I2C1_EV_IRQHandler
- .weak I2C1_ER_IRQHandler
- .weak I2C2_EV_IRQHandler
- .weak I2C2_ER_IRQHandler
- .weak SPI1_IRQHandler
- .weak SPI2_IRQHandler
- .weak USART1_IRQHandler
- .weak USART2_IRQHandler
- .weak USART3_IRQHandler
- .weak EXTI15_10_IRQHandler
- .weak RTCAlarm_IRQHandler
- .weak USBWakeUp_IRQHandler
- .weak USBHD_IRQHandler
-
- .section .text.handle_reset,"ax",@progbits
- .weak handle_reset
- .align 1
- handle_reset: /* handle_reset起始位置 */
- .option push
- .option norelax
- la gp, __global_pointer$ /* 将ld文件中的标签__global_pointer所处的地址值赋给gp寄存器 */
- .option pop
- 1:
- la sp, _eusrstack /* 将ld文件中的标签_eusrstack所处的地址值赋给sp寄存器 */
- 2:
- /* Load data section from flash to RAM */
- la a0, _data_lma
- la a1, _data_vma
- 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, _sbss
- la a1, _ebss
- bgeu a0, a1, 2f
- 1:
- sw zero, (a0)
- addi a0, a0, 4
- bltu a0, a1, 1b
- 2:
- /* enable all interrupt */ /* csrs ，根据寄存器中每个为1的位，把CSR寄存器对应位置位 */
- li t0, 0x88
- csrs mstatus, t0 /* 状态寄存器mstatus赋值为0x88，打开所有中断，设置MPP值为00 */
- la t0, _vector_base
- ori t0, t0, 1
- csrw mtvec, t0 /* 将中断向量表的首地址赋值给mtvec寄存器（中断发生时PC的地址） */
-
- jal SystemInit /* 设置MCU系统时钟 */
- la t0, main
- csrw mepc, t0
- mret
-
- /*
- mret返回指令(M模式特有的指令)，调用该指令会进行如下操作：
-
- - 将PC指针设置为mepc的值
- - 将mstatus的MPIE域复制到MIE来恢复之前的中断使能
- - 将权限模式设置为mstatus的MPP域中的值。
-
- 芯片上电默认进入的是机器模式，通过将mstatus中的MPP值设置为00（00: User, 01: Supervisor, 11: Machine），
- 并将main函数的地址赋值给mepc，调用mret，使得用户在进入main函数运行时，芯片由机器模式切换为用户模式。
- */
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