44b0alib.s

来自「arm编程 ads应用hello.rar」· S 代码 · 共 71 行

    GET option.s
    
   
    
    AREA _44b0alib, CODE, READONLY
    
    CODE32
    ALIGN
    
    ENTRY
    

    
 
    EXPORT IrqEnable
    EXPORT IrqDisable

    EXPORT ARMDisableInt2
    EXPORT ARMEnableInt2
    
    EXPORT GetIsrStartAddr
    
ARMDisableInt2    
    mrs  r0,cpsr
    stmfd sp!,{r0}
    orr r0,r0,#0xc0
    msr  cpsr_cxsf,r0
    mov pc,lr

ARMEnableInt2
    ldmfd sp!,{r0}
    msr cpsr_cxsf,r0
    mov pc,lr
    
IrqEnable
    mrs r0,cpsr
    bic r0,r0,#0x80
    orr r0,r0,#0x40
    msr cpsr_cxsf,r0
    
    ;stmfd sp!,{r1}
    ;mrs r1,cpsr
    ;bic r1,r1,#0xff
    ;orr r1,r1,r0
    ;msr cpsr_cxsf,r1
    ;ldmfd sp!,{r1}
    
    mov pc,lr

IrqDisable

    mrs r0,cpsr
    mov r1,r0
    orr r1,r1,#0xc0
    msr cpsr_cxsf,r1
    and r0,r0,#0x80
    
    ;stmfd sp!,{r1}
    ;mrs r1,cpsr
    ;bic r0,r1,#0xffffff00
    ;orr r1,r1,#0xd0
    ;msr cpsr_cxsf,r1
    ;ldmfd sp!,{r1}
    
    mov pc,lr

GetIsrStartAddr
    ldr r0,=_ISR_STARTADDRESS
    mov pc,lr

    END