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标题: ARM开发的问题1 [打印本页]

作者: wangxd54292000 时间: 2018-4-2 15:12 标题: ARM开发的问题1

各位高手，小弟基于友善之臂的MINI6410开发板编写裸板定时器中断程序。将裸板程序复制到SD卡中，设置开发板模式为SD卡启动。运行发现：系统未跳转到IRQ异常向量处执行。请教其中的原因。谢谢！启动文件内容如下：
.text
.globl _start
_start:
      b    reset
      ldr    pc, _undefined_instruction
      ldr    pc, _software_interrupt
      ldr    pc, _prefetch_abort
      ldr    pc, _data_abort
      ldr    pc, _not_used
      ldr    pc, _irq
      ldr    pc, _fiq

_undefined_instruction:
      .wordundefined_instruction
_software_interrupt:
      .wordsoftware_interrupt
_prefetch_abort:
      .wordprefetch_abort
_data_abort:
      .worddata_abort
_not_used:
      .wordnot_used
_irq:
      .wordirq
_fiq:
      .wordfiq
_pad:
      .word0x12345678 /* now 16*4=64 */

reset:
      ldrr0 , =0x7e004000
      movr1 , #0x0
      strr1 , [r0]

      /*复制中断向量表至0x0*/
      movr8 , #0
      adrr9 , _start
      ldmiar9! , {r0-r7}
      stmiar8! , {r0-r7}
      ldmiar9! , {r0-r7}
      stmiar8! , {r0-r7}

      ldrsp, =1024*4

      blmain

/*
* exception handlers
*/
      .align       5
undefined_instruction:
      ldrr0, =0x7f008800
      ldrr1, =0x11110000
      strr1, [r0]
      ldrr0, =0x7f008808
      ldrr1, =0x0
      strr1, [r0]

      bl    do_undefined_instruction

      .align       5
software_interrupt:
      ldrr0, =0x7f008800
      ldrr1, =0x11110000
      strr1, [r0]
      ldrr0, =0x7f008808
      ldrr1, =0x0
      strr1, [r0]

      bl    do_software_interrupt

      .align       5
prefetch_abort:
      ldrr0, =0x7f008800
      ldrr1, =0x11110000
      strr1, [r0]
      ldrr0, =0x7f008808
      ldrr1, =0x0
      strr1, [r0]

      bl    do_prefetch_abort

      .align       5
data_abort:
      ldrr0, =0x7f008800
      ldrr1, =0x11110000
      strr1, [r0]
      ldrr0, =0x7f008808
      ldrr1, =0x0
      strr1, [r0]

      bl    do_data_abort

      .align       5
not_used:
      ldrr0, =0x7f008800
      ldrr1, =0x11110000
      strr1, [r0]
      ldrr0, =0x7f008808
      ldrr1, =0x0
      strr1, [r0]

      bl    do_not_used

      .globlirq
      /*importc_irq_handler*/
      .align       5
irq:
      ldrr0, =0x7f008800
      ldrr1, =0x11110000
      strr1, [r0]
      ldrr0, =0x7f008808
      ldrr1, =0x0
      strr1, [r0]

      /*stmfdsp!, {r0-r12, lr}             ;保存现场 */

      bl c_irq_handler
                        /*调用中断处理子程序*/

      /*ldmfdsp!, {r0-r12, lr}             ;恢复现场*/

      /*subspc, lr, #4*/

      /*END*/
      .align       5
fiq:
      ldrr0, =0x7f008800
      ldrr1, =0x11110000
      strr1, [r0]
      ldrr0, =0x7f008808
      ldrr1, =0x0
      strr1, [r0]

      bl    do_fiq

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