path: root/libcpu/avr32/uc3/exception_gcc.S

/**
 * \file
 *
 * \brief Exception and interrupt vectors mapping for the INTC Software Driver.
 *
 * Copyright (c) 2009-2018 Microchip Technology Inc. and its subsidiaries.
 *
 * \asf_license_start
 *
 * \page License
 *
 * 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. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
 *
 * \asf_license_stop
 *
 */

#if !__AVR32_UC__ && !__AVR32_AP__
  #error Implementation for the AVR32 architecture only.
#endif


#include <avr32/io.h>


//! @{
//! \verbatim


.section  .exception, "ax", @progbits


// Start of Exception Vector Table.

/*
 * EVBA must be aligned with a power of two strictly greater than the
 * EVBA-relative offset of the last vector.
 */
.balign 0x200

// Export symbol.
.global _evba
.type _evba, @function
_evba:

	.org  0x000
	// Unrecoverable Exception.
_handle_Unrecoverable_Exception:
	rjmp $

	.org  0x004
	// TLB Multiple Hit.
_handle_TLB_Multiple_Hit:
	rjmp $

	.org  0x008
	// Bus Error Data Fetch.
_handle_Bus_Error_Data_Fetch:
	rjmp $

	.org  0x00C
	// Bus Error Instruction Fetch.
_handle_Bus_Error_Instruction_Fetch:
	rjmp $

	.org  0x010
	// NMI.
_handle_NMI:
	rjmp $

	.org  0x014
	// Instruction Address.
_handle_Instruction_Address:
	rjmp $

	.org  0x018
	// ITLB Protection.
_handle_ITLB_Protection:
	rjmp $

	.org  0x01C
	// Breakpoint.
_handle_Breakpoint:
	rjmp $

	.org  0x020
	// Illegal Opcode.
_handle_Illegal_Opcode:
	rjmp $

	.org  0x024
	// Unimplemented Instruction.
_handle_Unimplemented_Instruction:
	rjmp $

	.org  0x028
	// Privilege Violation.
_handle_Privilege_Violation:
	rjmp $

	.org  0x02C
	// Floating-Point: UNUSED IN AVR32UC and AVR32AP.
_handle_Floating_Point:
	rjmp $

	.org  0x030
	// Coprocessor Absent: UNUSED IN AVR32UC.
_handle_Coprocessor_Absent:
	rjmp $

	.org  0x034
	// Data Address (Read).
_handle_Data_Address_Read:
	rjmp $

	.org  0x038
	// Data Address (Write).
_handle_Data_Address_Write:
	rjmp $

	.org  0x03C
	// DTLB Protection (Read).
_handle_DTLB_Protection_Read:
	rjmp $

	.org  0x040
	// DTLB Protection (Write).
_handle_DTLB_Protection_Write:
	rjmp $

	.org  0x044
	// DTLB Modified: UNUSED IN AVR32UC.
_handle_DTLB_Modified:
	rjmp $

	.org  0x050
	// ITLB Miss.
_handle_ITLB_Miss:
	rjmp $

	.org  0x060
	// DTLB Miss (Read).
_handle_DTLB_Miss_Read:
	rjmp $

	.org  0x070
	// DTLB Miss (Write).
_handle_DTLB_Miss_Write:
	rjmp $

	.org  0x100
	// Supervisor Call.
_handle_Supervisor_Call:
	rjmp $


/*
 * Interrupt support.
 * The interrupt controller must provide the offset address relative to EVBA.
 * Important note:
 * All interrupts call a C function named _get_interrupt_handler.
 * This function will read group and interrupt line number to then return in
 *R12 a pointer to a user-provided interrupt handler.
 */

.balign 4

.irp    priority, 0, 1, 2, 3
.global _int\priority
.type   _int\priority, @function
_int\priority:
#if __AVR32_UC__
	/*
	 * R8-R12, LR, PC and SR are automatically pushed onto the system stack
	 * by the CPU upon interrupt entry. No other register is saved by
	 * hardware.
	 */
#elif __AVR32_AP__
	/*
	 * PC and SR are automatically saved in respectively RAR_INTx and
	 * RSR_INTx by the CPU upon interrupt entry. No other register is saved
	 * by hardware.
	 */
	pushm   r8-r12, lr
#endif
        mov     r12, \priority    // Pass the int_level parameter to the _get_interrupt_handler function.
        call    _get_interrupt_handler
        cp.w    r12, 0            // Get the pointer to the interrupt handler returned by the function.
        breq    _spint\priority   // If this was not a spurious interrupt (R12 != NULL), jump to the handler.
        call    rt_interrupt_enter
        icall   r12
        call    rt_interrupt_leave
        ssrf    AVR32_SR_GM_OFFSET			/* Disable global interrupt */
        lda.w   r12, rt_interrupt_nest		        /* Is nested interrupt? */
        ld.w    r11, r12[0]
        cp.w    r11, 0
        brne    _spint\priority
        lda.w   r12, rt_thread_switch_interrupt_flag	/* Is thread switch required? */
        ld.w    r11, r12[0]
        cp.w    r11, 1
        breq    rt_hw_context_switch_interrupt_do
_spint\priority:
    csrf    AVR32_SR_GM_OFFSET			/* Enable global interrupt */
#if __AVR32_UC__
	/*
	 * If this was not a spurious interrupt (R12 != NULL), jump to the
	 * handler.
	 */
	/* movne   pc, r12 */
#elif __AVR32_AP__
	// If this was a spurious interrupt (R12 == NULL), branch.
	breq    spint\priority
	/*
	 * Push the pointer to the interrupt handler onto the system stack since
	 * no register may be altered.
	 */
	st.w    --sp, r12
	popm    r8-r12, lr, pc  // Restore registers and jump to the handler.
spint\priority:
	popm    r8-r12, lr
#endif
	/*
	 * If this was a spurious interrupt (R12 == NULL), return from event
	 * handler.
	 */
	rete
.endr

rt_hw_context_switch_interrupt_do:
  mov     r11, 0
  st.w    r12[0], r11					/* Clear rt_thread_switch_interrupt_flag */
  stm     --sp, r0-r7					/* Push R0-R7 */
  lda.w   r12, rt_interrupt_from_thread	/* Get old thread SP */
  ld.w    r12, r12[0]
  lda.w   r11, rt_interrupt_to_thread	/* Get new thread SP */
  ld.w    r11, r11[0]
  st.w    r12[0], sp					/* Store old thread SP */
  ld.w    sp, r11[0]					/* Load new thread SP */
  ldm     sp++, r0-r7					/* Pop R0-R7 (new thread) */
  rete							/* RETE pops R8-R12, LR, PC, SR automatically */

// Constant data area.

.balign 4

// Values to store in the interrupt priority registers for the various interrupt priority levels.
// The interrupt priority registers contain the interrupt priority level and
// the EVBA-relative interrupt vector offset.
.global ipr_val
.type ipr_val, @object
ipr_val:
  .word (AVR32_INTC_INT0 << AVR32_INTC_IPR_INTLEVEL_OFFSET) | (_int0 - _evba),\
        (AVR32_INTC_INT1 << AVR32_INTC_IPR_INTLEVEL_OFFSET) | (_int1 - _evba),\
        (AVR32_INTC_INT2 << AVR32_INTC_IPR_INTLEVEL_OFFSET) | (_int2 - _evba),\
        (AVR32_INTC_INT3 << AVR32_INTC_IPR_INTLEVEL_OFFSET) | (_int3 - _evba)

//! \endverbatim
//! @}