/********************************** (C) COPYRIGHT *******************************
* File Name : startup_CH59x.s
* Author : WCH
* Version : V1.0.0
* Date : 2021/02/25
* Description :
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/
.section .init,"ax",@progbits
.global _start
.align 1
_start:
j handle_reset
.section .vector,"ax",@progbits
.align 1
_vector_base:
.option norvc;
.word 0
.word 0
.word NMI_Handler /* NMI Handler */
.word HardFault_Handler /* Hard Fault Handler */
.word 0xF5F9BDA9
.word Ecall_M_Mode_Handler /* 5 */
.word 0
.word 0
.word Ecall_U_Mode_Handler /* 8 */
.word Break_Point_Handler /* 9 */
.word 0
.word 0
.word SysTick_Handler /* SysTick Handler */
.word 0
.word SW_Handler /* SW Handler */
.word 0
/* External Interrupts */
.word TMR0_IRQHandler /* 0: TMR0 */
.word GPIOA_IRQHandler /* GPIOA */
.word GPIOB_IRQHandler /* GPIOB */
.word SPI0_IRQHandler /* SPI0 */
.word BB_IRQHandler /* BLEB */
.word LLE_IRQHandler /* BLEL */
.word USB_IRQHandler /* USB */
.word 0
.word TMR1_IRQHandler /* TMR1 */
.word TMR2_IRQHandler /* TMR2 */
.word UART0_IRQHandler /* UART0 */
.word UART1_IRQHandler /* UART1 */
.word RTC_IRQHandler /* RTC */
.word ADC_IRQHandler /* ADC */
.word I2C_IRQHandler /* I2C */
.word PWMX_IRQHandler /* PWMX */
.word TMR3_IRQHandler /* TMR3 */
.word UART2_IRQHandler /* UART2 */
.word UART3_IRQHandler /* UART3 */
.word WDOG_BAT_IRQHandler /* WDOG_BAT */
.option rvc;
.section .vector_handler, "ax", @progbits
.weak NMI_Handler
.weak HardFault_Handler
.weak Ecall_M_Mode_Handler
.weak Ecall_U_Mode_Handler
.weak Break_Point_Handler
.weak SysTick_Handler
.weak SW_Handler
.weak TMR0_IRQHandler
.weak GPIOA_IRQHandler
.weak GPIOB_IRQHandler
.weak SPI0_IRQHandler
.weak BB_IRQHandler
.weak LLE_IRQHandler
.weak USB_IRQHandler
.weak TMR1_IRQHandler
.weak TMR2_IRQHandler
.weak UART0_IRQHandler
.weak UART1_IRQHandler
.weak RTC_IRQHandler
.weak ADC_IRQHandler
.weak I2C_IRQHandler
.weak PWMX_IRQHandler
.weak TMR3_IRQHandler
.weak UART2_IRQHandler
.weak UART3_IRQHandler
.weak WDOG_BAT_IRQHandler
NMI_Handler: 1: j 1b
HardFault_Handler: 1: j 1b
Ecall_M_Mode_Handler: 1: j 1b
Ecall_U_Mode_Handler: 1: j 1b
Break_Point_Handler: 1: j 1b
SysTick_Handler: 1: j 1b
SW_Handler: 1: j 1b
TMR0_IRQHandler: 1: j 1b
GPIOA_IRQHandler: 1: j 1b
GPIOB_IRQHandler: 1: j 1b
SPI0_IRQHandler: 1: j 1b
BB_IRQHandler: 1: j 1b
LLE_IRQHandler: 1: j 1b
USB_IRQHandler: 1: j 1b
TMR1_IRQHandler: 1: j 1b
TMR2_IRQHandler: 1: j 1b
UART0_IRQHandler: 1: j 1b
UART1_IRQHandler: 1: j 1b
RTC_IRQHandler: 1: j 1b
ADC_IRQHandler: 1: j 1b
I2C_IRQHandler: 1: j 1b
PWMX_IRQHandler: 1: j 1b
TMR3_IRQHandler: 1: j 1b
UART2_IRQHandler: 1: j 1b
UART3_IRQHandler: 1: j 1b
WDOG_BAT_IRQHandler: 1: j 1b
.section .handle_reset,"ax",@progbits
.weak handle_reset
.align 1
handle_reset:
.option push
.option norelax
la gp, __global_pointer$
.option pop
1:
la sp, _eusrstack
/* Load highcode code section from flash to RAM */
2:
la a0, _highcode_lma
la a1, _highcode_vma_start
la a2, _highcode_vma_end
bgeu a1, a2, 2f
1:
lw t0, (a0)
sw t0, (a1)
addi a0, a0, 4
addi a1, a1, 4
bltu a1, a2, 1b
/* Load data section from flash to RAM */
2:
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:
/* 流水线控制位 & 动态预测控制位 */
li t0, 0x1f
csrw 0xbc0, t0
/* 打开嵌套中断、硬件压栈功能 */
li t0, 0x3
csrw 0x804, t0
li t0, 0x1888
csrw mstatus, t0
la t0, _vector_base
/* 配置向量表模式为绝对地址模式 */
ori t0, t0, 3
csrw mtvec, t0
la t0, main
csrw mepc, t0
mret
这个代码所示沁恒的单片机的启动文件，帮我注释一下
最新发布
本文解析了ELF文件中段信息的含义，重点介绍了Reset_Handler段的属性，包括其权限设置为可分配和可执行，以及progbits类型。通过使用readelf工具查看ELF文件的具体段信息。
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