/* File: startup_ARMCM0.S
 * Purpose: startup file for Cortex-M0 devices. Should use with
 *   GCC for ARM Embedded Processors
 * Version: V1.4
 * Date: 20 Dezember 2012
 *
 */
/* Copyright (c) 2011 - 2012 ARM LIMITED

   All rights reserved.
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
   - Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   - 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.
   - Neither the name of ARM 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 COPYRIGHT HOLDERS AND 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.
   ---------------------------------------------------------------------------*/


    .syntax unified
    .arch armv6-m

    .section .stack
    .align 3
#ifdef __STACK_SIZE
    .equ    Stack_Size, __STACK_SIZE
#else
    .equ    Stack_Size, 0x00000400
#endif
    .globl    __StackTop
    .globl    __StackLimit
__StackLimit:
    .space    Stack_Size
    .size __StackLimit, . - __StackLimit
__StackTop:
    .size __StackTop, . - __StackTop

    .section .heap
    .align 3
#ifdef __HEAP_SIZE
    .equ    Heap_Size, __HEAP_SIZE
#else
    .equ    Heap_Size, 0x00000C00
#endif
    .globl    __HeapBase
    .globl    __HeapLimit
__HeapBase:
    .if    Heap_Size
    .space    Heap_Size
    .endif
    .size __HeapBase, . - __HeapBase
__HeapLimit:
    .size __HeapLimit, . - __HeapLimit

    .section .isr_vector
    .align 2
    .globl __isr_vector
__isr_vector:
    .long    __StackTop            /* Top of Stack */
    .long    Reset_Handler         /* Reset Handler */
    .long    NMI_Handler           /* NMI Handler */
    .long    HardFault_Handler     /* Hard Fault Handler */
    .long    0                     /* Reserved */
    .long    0                     /* Reserved */
    .long    0                     /* Reserved */
    .long    0                     /* Reserved */
    .long    0                     /* Reserved */
    .long    0                     /* Reserved */
    .long    0                     /* Reserved */
    .long    SVC_Handler           /* SVCall Handler */
    .long    0                     /* Reserved */
    .long    0                     /* Reserved */
    .long    PendSV_Handler        /* PendSV Handler */
    .long    SysTick_Handler       /* SysTick Handler */

    /* External interrupts */
    .long    WDT_IRQHandler        /*  0:  Watchdog Timer            */
    .long    RTC_IRQHandler        /*  1:  Real Time Clock           */
    .long    TIM0_IRQHandler       /*  2:  Timer0 / Timer1           */
    .long    TIM2_IRQHandler       /*  3:  Timer2 / Timer3           */
    .long    MCIA_IRQHandler       /*  4:  MCIa                      */
    .long    MCIB_IRQHandler       /*  5:  MCIb                      */
    .long    UART0_IRQHandler      /*  6:  UART0 - DUT FPGA          */
    .long    UART1_IRQHandler      /*  7:  UART1 - DUT FPGA          */
    .long    UART2_IRQHandler      /*  8:  UART2 - DUT FPGA          */
    .long    UART4_IRQHandler      /*  9:  UART4 - not connected     */
    .long    AACI_IRQHandler       /* 10: AACI / AC97                */
    .long    CLCD_IRQHandler       /* 11: CLCD Combined Interrupt    */
    .long    ENET_IRQHandler       /* 12: Ethernet                   */
    .long    USBDC_IRQHandler      /* 13: USB Device                 */
    .long    USBHC_IRQHandler      /* 14: USB Host Controller        */
    .long    CHLCD_IRQHandler      /* 15: Character LCD              */
    .long    FLEXRAY_IRQHandler    /* 16: Flexray                    */
    .long    CAN_IRQHandler        /* 17: CAN                        */
    .long    LIN_IRQHandler        /* 18: LIN                        */
    .long    I2C_IRQHandler        /* 19: I2C ADC/DAC                */
    .long    0                     /* 20: Reserved                   */
    .long    0                     /* 21: Reserved                   */
    .long    0                     /* 22: Reserved                   */
    .long    0                     /* 23: Reserved                   */
    .long    0                     /* 24: Reserved                   */
    .long    0                     /* 25: Reserved                   */
    .long    0                     /* 26: Reserved                   */
    .long    0                     /* 27: Reserved                   */
    .long    CPU_CLCD_IRQHandler   /* 28: Reserved - CPU FPGA CLCD   */
    .long    0                     /* 29: Reserved - CPU FPGA        */
    .long    UART3_IRQHandler      /* 30: UART3    - CPU FPGA        */
    .long    SPI_IRQHandler        /* 31: SPI Touchscreen - CPU FPGA */

    .size    __isr_vector, . - __isr_vector

    .text
    .thumb
    .thumb_func
    .align 1
    .globl    Reset_Handler
    .type    Reset_Handler, %function
Reset_Handler:
/*     Loop to copy data from read only memory to RAM. The ranges
 *      of copy from/to are specified by following symbols evaluated in
 *      linker script.
 *      __etext: End of code section, i.e., begin of data sections to copy from.
 *      __data_start__/__data_end__: RAM address range that data should be
 *      copied to. Both must be aligned to 4 bytes boundary.  */

    ldr    r1, =__etext
    ldr    r2, =__data_start__
    ldr    r3, =__data_end__

    subs    r3, r2
    ble     .LC0

.LC1:
    subs    r3, 4
    ldr    r0, [r1,r3]
    str    r0, [r2,r3]
    bgt    .LC1
.LC0:

#ifdef __STARTUP_CLEAR_BSS
/*     This part of work usually is done in C library startup code. Otherwise,
 *     define this macro to enable it in this startup.
 *
 *     Loop to zero out BSS section, which uses following symbols
 *     in linker script:
 *      __bss_start__: start of BSS section. Must align to 4
 *      __bss_end__: end of BSS section. Must align to 4
 */
    ldr r1, =__bss_start__
    ldr r2, =__bss_end__

    subs    r2, r1
    ble .LC3

    movs    r0, 0
.LC2:
    str r0, [r1, r2]
    subs    r2, 4
    bge .LC2
.LC3:
#endif

#ifndef __NO_SYSTEM_INIT
    bl	SystemInit
#endif

#ifndef __START
#define __START _start
#endif
    bl	__START

    .pool
    .size Reset_Handler, . - Reset_Handler

/*    Macro to define default handlers. Default handler
 *    will be weak symbol and just dead loops. They can be
 *    overwritten by other handlers */
    .macro    def_irq_handler    handler_name
    .align 1
    .thumb_func
    .weak    \handler_name
    .type    \handler_name, %function
\handler_name :
    b    .
    .size    \handler_name, . - \handler_name
    .endm

    def_irq_handler    NMI_Handler
    def_irq_handler    HardFault_Handler
    def_irq_handler    SVC_Handler
    def_irq_handler    PendSV_Handler
    def_irq_handler    SysTick_Handler
    def_irq_handler    Default_Handler

    def_irq_handler    WDT_IRQHandler
    def_irq_handler    RTC_IRQHandler
    def_irq_handler    TIM0_IRQHandler
    def_irq_handler    TIM2_IRQHandler
    def_irq_handler    MCIA_IRQHandler
    def_irq_handler    MCIB_IRQHandler
    def_irq_handler    UART0_IRQHandler
    def_irq_handler    UART1_IRQHandler
    def_irq_handler    UART2_IRQHandler
    def_irq_handler    UART3_IRQHandler
    def_irq_handler    UART4_IRQHandler
    def_irq_handler    AACI_IRQHandler
    def_irq_handler    CLCD_IRQHandler
    def_irq_handler    ENET_IRQHandler
    def_irq_handler    USBDC_IRQHandler
    def_irq_handler    USBHC_IRQHandler
    def_irq_handler    CHLCD_IRQHandler
    def_irq_handler    FLEXRAY_IRQHandler
    def_irq_handler    CAN_IRQHandler
    def_irq_handler    LIN_IRQHandler
    def_irq_handler    I2C_IRQHandler
    def_irq_handler    CPU_CLCD_IRQHandler
    def_irq_handler    SPI_IRQHandler

    .end
