/********************************************************************************************
* arch/avr/src/atmega/atmega_exceptions.S
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
********************************************************************************************/
/********************************************************************************************
* Included Files
********************************************************************************************/
#include <nuttx/config.h>
#include <arch/irq.h>
#include "excptmacros.h"
/********************************************************************************************
* External Symbols
********************************************************************************************/
.file "atmega_exceptions.S"
.global up_doirq
.global up_fullcontextrestore
/********************************************************************************************
* Macros
********************************************************************************************/
/********************************************************************************************
* Exception Vector Handlers
********************************************************************************************/
.section .handlers, "ax", @progbits
HANDLER atmega_int0, ATMEGA_IRQ_INT0, excpt_common /* External interrupt request 0 */
HANDLER atmega_int1, ATMEGA_IRQ_INT1, excpt_common /* External interrupt request 1 */
HANDLER atmega_int2, ATMEGA_IRQ_INT2, excpt_common /* External interrupt request 2 */
HANDLER atmega_int3, ATMEGA_IRQ_INT3, excpt_common /* External interrupt request 3 */
HANDLER atmega_int4, ATMEGA_IRQ_INT4, excpt_common /* External interrupt request 4 */
HANDLER atmega_int5, ATMEGA_IRQ_INT5, excpt_common /* External interrupt request 5 */
HANDLER atmega_int6, ATMEGA_IRQ_INT6, excpt_common /* External interrupt request 6 */
HANDLER atmega_int7, ATMEGA_IRQ_INT7, excpt_common /* External interrupt request 7 */
HANDLER atmega_t2comp, ATMEGA_IRQ_T2COMP, excpt_common /* TIMER2 COMP timer/counter2 compare match */
HANDLER atmega_t2ovf, ATMEGA_IRQ_T2OVF, excpt_common /* TIMER2 OVF timer/counter2 overflow */
HANDLER atmega_t1capt, ATMEGA_IRQ_T1CAPT, excpt_common /* TIMER1 CAPT timer/counter1 capture event */
HANDLER atmega_t1compa, ATMEGA_IRQ_T1COMPA, excpt_common /* TIMER1 COMPA timer/counter1 compare match a */
HANDLER atmega_t1compb, ATMEGA_IRQ_T1COMPB, excpt_common /* TIMER1 COMPB timer/counter1 compare match b */
HANDLER atmega_t1ovf, ATMEGA_IRQ_T1OVF, excpt_common /* TIMER1 OVF timer/counter1 overflow */
HANDLER atmega_t0comp, ATMEGA_IRQ_T0COMP, excpt_common /* TIMER0 COMP timer/counter0 compare match */
HANDLER atmega_t0ovf, ATMEGA_IRQ_T0OVF, excpt_common /* TIMER0 OVF timer/counter0 overflow */
HANDLER atmega_spi, ATMEGA_IRQ_SPI, excpt_common /* STC SPI serial transfer complete */
HANDLER atmega_u0rx, ATMEGA_IRQ_U0RX, excpt_common /* USART0 RX complete */
HANDLER atmega_u0dre, ATMEGA_IRQ_U0DRE, excpt_common /* USART0 data register empty */
HANDLER atmega_u0tx, ATMEGA_IRQ_U0TX, excpt_common /* USART0 TX complete */
HANDLER atmega_adc, ATMEGA_IRQ_ADC, excpt_common /* ADC conversion complete */
HANDLER atmega_ee, ATMEGA_IRQ_EE, excpt_common /* EEPROM ready */
HANDLER atmega_anacomp, ATMEGA_IRQ_ANACOMP, excpt_common /* ANALOG COMP analog comparator */
HANDLER atmega_t1compc, ATMEGA_IRQ_T1COMPC, excpt_common /* TIMER1 COMPC timer/countre1 compare match c */
HANDLER atmega_t3capt, ATMEGA_IRQ_T3CAPT, excpt_common /* TIMER3 CAPT timer/counter3 capture event */
HANDLER atmega_t3compa, ATMEGA_IRQ_T3COMPA, excpt_common /* TIMER3 COMPA timer/counter3 compare match a */
HANDLER atmega_t3compb, ATMEGA_IRQ_T3COMPB, excpt_common /* TIMER3 COMPB timer/counter3 compare match b */
HANDLER atmega_t3compc, ATMEGA_IRQ_T3COMPC, excpt_common /* TIMER3 COMPC timer/counter3 compare match c */
HANDLER atmega_t3ovf, ATMEGA_IRQ_T3OVF, excpt_common /* TIMER3 OVF timer/counter3 overflow */
HANDLER atmega_u1rx, ATMEGA_IRQ_U1RX, excpt_common /* USART1 RX complete */
HANDLER atmega_u1dre, ATMEGA_IRQ_U1DRE, excpt_common /* USART1 data register empty */
HANDLER atmega_u1tx, ATMEGA_IRQ_U1TX, excpt_common /* USART1 TX complete */
HANDLER atmega_twi, ATMEGA_IRQ_TWI, excpt_common /* TWI two-wire serial interface */
HANDLER atmega_spmrdy, ATMEGA_IRQ_SPMRDY, excpt_common /* Store program memory ready */
/********************************************************************************************
* Name: excpt_common
*
* Description:
* Exception Vector Handlers
*
* On Entry:
* The return PC and the saved r24 is on the stack, r24 now contains the IRQ number
*
* PCL
* PCH
* R0
* --- <- SP
*
********************************************************************************************/
excpt_common:
/* Save the remaining registers on the stack, preserving the IRQ number in r14 */
EXCPT_PROLOGUE
/* Call up_doirq with r24 = IRQ number, r22-23 = Pointer to the save structure. The stack
* pointer currently points to the save structure (or maybe the save struture -1 since
* the push operation post-decrements -- need to REVISIT this).
*/
in r28, _SFR_IO_ADDR(SPL) /* Get the save structure pointer in a Call-saved register pair */
in r29, _SFR_IO_ADDR(SPH) /* Pointer can be obtained from the stack pointer */
adiw r28, 1 /* Remembering that push post-decrements */
movw r22, r28 /* Pass register save structure as the parameter 2 */
USE_INTSTACK rx, ry, rz /* Switch to the interrupt stack */
call up_doirq /* Dispatch the interrupt */
RESTORE_STACK rx, ry /* Undo the operations of USE_INTSTACK */
/* up_doiq returns with r24-r25 equal to the new save structure. If no context
* switch occurred, this will be the same as the value passed to it in r22-23.
* But if a context switch occurs, then the returned value will point not at a
* stack frame, but at a register save area inside of the new task's TCB.
*/
cp r28, r24
cpc r29, r25
breq .Lnoswitch
/* A context switch has occurred, jump to up_fullcontextrestore with r24, r25
* equal to the address of the new register save ared.
*/
jmp up_fullcontextrestore
/* No context switch occurred.. just return off the stack */
.Lnoswitch:
EXCPT_EPILOGUE
reti
/****************************************************************************************************
* Name: up_interruptstack
****************************************************************************************************/
#if CONFIG_ARCH_INTERRUPTSTACK > 0
.bss
.align 4
.globl up_interruptstack
.type up_interruptstack, object
up_interruptstack:
.skip CONFIG_ARCH_INTERRUPTSTACK
.Lintstackbase:
.size up_interruptstack, .-up_interruptstack
#endif
.end
