// **********************************************************************
// *                    SEGGER Microcontroller GmbH                     *
// *                        The Embedded Experts                        *
// **********************************************************************
// *                                                                    *
// *            (c) 2014 - 2019 SEGGER Microcontroller GmbH             *
// *            (c) 2001 - 2019 Rowley Associates Limited               *
// *                                                                    *
// *           www.segger.com     Support: support@segger.com           *
// *                                                                    *
// **********************************************************************
// *                                                                    *
// * 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.    *
// *                                                                    *
// * - Neither the name of SEGGER Microcontroller GmbH                  *
// *   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 SEGGER Microcontroller GmbH 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;    *
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// * DAMAGE.                                                            *
// *                                                                    *
// **********************************************************************

	.syntax	unified

	.section .stack
	.align	3
#ifdef __STACK_SIZE
	.equ	Stack_Size, __STACK_SIZE
#else
	.equ	Stack_Size, 0xc00
#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, 0
#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
	.long	Reset_Handler
	.long	NMI_Handler
	.long	HardFault_Handler
	.long	MemManage_Handler
	.long	BusFault_Handler
	.long	UsageFault_Handler
	.long	0                     /* Reserved */
	.long	0                     /* Reserved */
	.long	0                     /* Reserved */
	.long	0                     /* Reserved */
	.long	SVC_Handler
	.long	DebugMon_Handler
	.long	0                     /* Reserved */
	.long	PendSV_Handler
	.long	SysTick_Handler

	/* External interrupts */
	.long	Default_Handler

	.size	__isr_vector, . - __isr_vector

	.text
	.thumb
	.thumb_func
	.align	2
	.globl	Reset_Handler
	.type	Reset_Handler, %function
Reset_Handler:

/*  Single section scheme.
 *
 *  The ranges of copy from/to are specified by following symbols
 *    __etext: LMA of start of the section to copy from. Usually end of text
 *    __data_start__: VMA of start of the section to copy to
 *    __data_end__: VMA of end of the section to copy to
 *
 *  All addresses must be aligned to 4 bytes boundary.
 */
	ldr	r1, =__etext
	ldr	r2, =__data_start__
	ldr	r3, =__data_end__

.L_loop1:
	cmp	r2, r3
	ittt	lt
	ldrlt	r0, [r1], #4
	strlt	r0, [r2], #4
	blt	.L_loop1

/*  Single BSS section scheme.
 *
 *  The BSS section is specified by following symbols
 *    __bss_start__: start of the BSS section.
 *    __bss_end__: end of the BSS section.
 *
 *  Both addresses must be aligned to 4 bytes boundary.
 */
	ldr	r1, =__bss_start__
	ldr	r2, =__bss_end__

	movs	r0, 0
.L_loop3:
	cmp	r1, r2
	itt	lt
	strlt	r0, [r1], #4
	blt	.L_loop3

#ifndef __NO_SYSTEM_INIT
	bl	SystemInit
#endif

#ifndef __START
#define __START main
#endif
	bl	__START

	.pool
	.size	Reset_Handler, . - Reset_Handler

	.align	1
        .thumb_func
        .weak SystemInit
        .type SystemInit, %function
SystemInit:
        bx lr

	.thumb_func
	.weak	Default_Handler
	.type	Default_Handler, %function
Default_Handler:
	b	.
	.size	Default_Handler, . - Default_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
	.weak	\handler_name
	.set	\handler_name, Default_Handler
	.endm

	def_irq_handler	NMI_Handler
	def_irq_handler	HardFault_Handler
	def_irq_handler	MemManage_Handler
	def_irq_handler	BusFault_Handler
	def_irq_handler	UsageFault_Handler
	def_irq_handler	SVC_Handler
	def_irq_handler	DebugMon_Handler
	def_irq_handler	PendSV_Handler
	def_irq_handler	SysTick_Handler
	def_irq_handler	DEF_IRQHandler

	.end
