/* * See header file for description. */ portSTACK_TYPE * ICACHE_FLASH_ATTR pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters ) { #define SET_STKREG(r,v) sp[(r) >> 2] = (portSTACK_TYPE)(v) portSTACK_TYPE *sp, *tp; /* Create interrupt stack frame aligned to 16 byte boundary */ sp = (portSTACK_TYPE*) (((INT32U)(pxTopOfStack+1) - XT_CP_SIZE - XT_STK_FRMSZ) & ~0xf); /* Clear the entire frame (do not use memset() because we don't depend on C library) */ for (tp = sp; tp <= pxTopOfStack; ++tp) *tp = 0; /* Explicitly initialize certain saved registers */ SET_STKREG( XT_STK_PC, pxCode ); /* task entrypoint */ SET_STKREG( XT_STK_A0, 0 ); /* to terminate GDB backtrace */ SET_STKREG( XT_STK_A1, (INT32U)sp + XT_STK_FRMSZ ); /* physical top of stack frame */ SET_STKREG( XT_STK_A2, pvParameters ); /* parameters */ SET_STKREG( XT_STK_EXIT, _xt_user_exit ); /* user exception exit dispatcher */ /* Set initial PS to int level 0, EXCM disabled ('rfe' will enable), user mode. */ #ifdef __XTENSA_CALL0_ABI__ SET_STKREG( XT_STK_PS, PS_UM | PS_EXCM ); #else /* + for windowed ABI also set WOE and CALLINC (pretend task was 'call4'd). */ SET_STKREG( XT_STK_PS, PS_UM | PS_EXCM | PS_WOE | PS_CALLINC(1) ); #endif return sp; }
/* * Stack initialization */ portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters ) { #define SET_STKREG(r,v) sp[(r) >> 2] = (portSTACK_TYPE)(v) portSTACK_TYPE *sp, *tp; /* Create interrupt stack frame aligned to 16 byte boundary */ sp = (portSTACK_TYPE*) (((uint32_t)(pxTopOfStack+1) - XT_CP_SIZE - XT_STK_FRMSZ) & ~0xf); /* Clear the entire frame (do not use memset() because we don't depend on C library) */ for (tp = sp; tp <= pxTopOfStack; ++tp) *tp = 0; /* Explicitly initialize certain saved registers */ SET_STKREG( XT_STK_PC, pxCode ); /* task entrypoint */ SET_STKREG( XT_STK_A0, 0 ); /* to terminate GDB backtrace */ SET_STKREG( XT_STK_A1, (uint32_t)sp + XT_STK_FRMSZ ); /* physical top of stack frame */ SET_STKREG( XT_STK_A2, pvParameters ); /* parameters */ SET_STKREG( XT_STK_EXIT, sdk__xt_user_exit ); /* user exception exit dispatcher */ /* Set initial PS to int level 0, EXCM disabled ('rfe' will enable), user mode. */ SET_STKREG( XT_STK_PS, PS_UM | PS_EXCM ); return sp; }