看芯片官方手册
找到中断这一章节
里面有详细的如何屏蔽中断
下面给出210的代码.text
.global _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: .word undefined_instruction _software_interrupt:.word software_interrupt _prefetch_abort:.word prefetch_abort _data_abort:.word data_abort _not_used:.word not_used _irq:.word irq _fiq:.word fiq undefined_instruction: nop software_interrupt: nop prefetch_abort: nop data_abort: nop not_used: nop irq: nop fiq: nop reset: bl set_svc bl disable_watchdog bl diasble_interrupt set_svc: mrs r0, cpsr bic r0, r0, #0x1f orr r0, r0, #0xd3 msr cpsr, r0
#define pwTCON 0x53000000 disable_watchdog: ldr r0, =pwTCON mov r1, #0x0 str r1, [r0] disable_interrupt mvn r1, #0x0 ldr r0, =0xf2000014 str r1, [r0] ldr r0, =0xf2100014 str r1, [r0] ldr r0, =0xf2200014 str r1, [r0] ldr r0, =0xf2300014 str r1, [r0]
2440
.text .global _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: .word undefined_instruction _software_interrupt:.word software_interrupt _prefetch_abort:.word prefetch_abort _data_abort:.word data_abort _not_used:.word not_used _irq:.word irq _fiq:.word fiq undefined_instruction: nop software_interrupt: nop prefetch_abort: nop data_abort: nop not_used: nop irq: nop fiq: nop reset: bl set_svc bl disable_watchdog bl diasble_interrupt set_svc: mrs r0, cpsr bic r0, r0, #0x1f orr r0, r0, #0xd3 msr cpsr, r0 #define pwTCON 0x53000000 disable_watchdog: ldr r0, =pwTCON mov r1, #0x0 str r1, [r0] disable_interrupt mvn r1, #0x0 ldr r0, =0x4a000008 str r1,[r0]
6410
.text .global _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: .word undefined_instruction _software_interrupt:.word software_interrupt _prefetch_abort:.word prefetch_abort _data_abort:.word data_abort _not_used:.word not_used _irq:.word irq _fiq:.word fiq undefined_instruction: nop software_interrupt: nop prefetch_abort: nop data_abort: nop not_used: nop irq: nop fiq: nop reset: bl set_svc bl disable_watchdog bl diasble_interrupt set_svc: mrs r0, cpsr bic r0, r0, #0x1f orr r0, r0, #0xd3 msr cpsr, r0 #define pwTCON 0x53000000 disable_watchdog: ldr r0, =pwTCON mov r1, #0x0 str r1, [r0] disable_interrupt mvn r1, #0x0 ldr r0, =0x71200014 str r1, [r0] ldr r0, =0x71300014 str r1, [r0]
三者主要的不同就在屏蔽中断的代码不一样，2440只有一个寄存器管理中断的清除，6410有两个寄存器管理中断的清除，210有4个寄存器管理中断的清除。
这三段代码执行完每个部分之后，就需要加上 mov pc lr，这是把之前跳转的lr保存的pc地址给返回给pc。