OS_STK *OSTaskStkInit (void (*task)(void *p_arg), void *p_arg, OS_STK *ptos, INT16U opt)
{
OS_STK *stk;
(void)opt; /* 'opt' is not used, prevent warning */
stk = ptos; /* Load stack pointer */
/* Registers stacked as if auto-saved on exception */
*(stk) = (INT32U)0x01000000uL; /* xPSR */
*(--stk) = (INT32U)task; /* Entry Point */
*(--stk) = (INT32U)OS_TaskReturn; /* R14 (LR) */
*(--stk) = (INT32U)0x12121212uL; /* R12 */
*(--stk) = (INT32U)0x03030303uL; /* R3 */
*(--stk) = (INT32U)0x02020202uL; /* R2 */
*(--stk) = (INT32U)0x01010101uL; /* R1 */
*(--stk) = (INT32U)p_arg; /* R0 : argument */
/* Remaining registers saved on process stack */
//*(--stk) = (INT32U)0x11111111uL; /* R11 */
//*(--stk) = (INT32U)0x10101010uL; /* R10 */
//*(--stk) = (INT32U)0x09090909uL; /* R9 */
//*(--stk) = (INT32U)0x08080808uL; /* R8 */
*(--stk) = (INT32U)0x07070707uL; /* R7 */
*(--stk) = (INT32U)0x06060606uL; /* R6 */
*(--stk) = (INT32U)0x05050505uL; /* R5 */
*(--stk) = (INT32U)0x04040404uL; /* R4 */
return (stk);
}
这里为什么是屏蔽的 R8 R9 R10 R11 不需要保存??? |