arm - task switching didn't work out - 


.macro      save_context      swi_f     ldr     sp,=current_p               /* switch pcb */     ldr     sp,[sp]                     /* pcb ptr */     add     sp,sp,#68                   /* point top of stack */ .if (\swi_f == 0)                       /* if not swi macro */     sub     lr,lr,#0x04                 /* return addr */ .endif                                  /* lr -= 4 if not swi */     stmdb   sp!,{lr}     stmdb   sp!,{r0-r12,lr}             /* prepare return */      mrs     r1,spsr                     /* r1 <- spsr_usr */     mrs     r2,cpsr                     /* r2 <- cpsr */     push    {r1}                        /* save spsr_usr */     msr     cpsr_c,#sys_mode|no_intr    /* switch sys mode */     mov     r3,sp                       /* r3 <- sp_usr */     msr     cpsr,r2                     /* switch */     push    {r3}                        /* save sp_usr */     mov     r0,lr                       /* r0 <-- lr */     msr     cpsr_c,#svc_mode|no_intr    /* switch svc mode */     ldr     sp,=kernel_stack            /* switch svc stack */ .endm  .macro      set_isr_proc     isr_proc   /* */     ldr     lr,=__restart               /* set return address */     ldr     pc,=\isr_proc               /* call isr */ .endm  __restart:                              /* restore context */     ldr     sp,=current_p               /* pcb */     ldr     sp,[sp]                     /* adjust pcb */ re_restart:                             /* ret kernel */     pop     {r3}                        /* r3 <- sp_usr */     mrs     r2,cpsr                     /* r2 <- cpsr */     msr     cpsr_c,sys_mode|no_intr     /* switch sys mode*/     mov     sp,r3                       /* sp_usr <-- r3 */     msr     cpsr,r2                     /* switch */     pop     {r1}                        /* r1 <- spsr_usr */     msr     spsr,r1                     /* restore spsr */     ldmia   sp!,{r0-r12,lr,pc}^         /* intr ret */  _do_irq:     save_context    0                   /* not swi */     set_isr_proc    do_irq

this task switching code works on s3c2440 board when got 1 task when 2 or more tasks created ,task0 go execute task1 code or task 1 execute task0 code ,i do't know why ,any need !

the code ok atfer saved lr_usr @ irq mode (restore usr_ lr when return also).the code posted before not work out when task call func ,if func interrupted func not finished yet ,and clock interrupt change current_p,the lr not right lr after interrupt return


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