/*
 * Copyright (c) 2022 OpenLuat & AirM2M
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

  .syntax unified
  .cpu cortex-m4
  .fpu softvfp
  .thumb

.global  g_pfnVectors
.global  Default_Handler

/* start address for the initialization values of the .data section. 
defined in linker script */
.word  _sidata
/* start address for the .data section. defined in linker script */  
.word  _sdata
/* end address for the .data section. defined in linker script */
.word  _edata
/* start address for the .bss section. defined in linker script */
.word  _sbss
/* end address for the .bss section. defined in linker script */
.word  _ebss
/* stack used for SystemInit_ExtMemCtl; always internal RAM used */

/**
 * @brief  This is the code that gets called when the processor first
 *          starts execution following a reset event. Only the absolutely
 *          necessary set is performed, after which the application
 *          supplied main() routine is called. 
 * @param  None
 * @retval : None
*/

    .section  .text.Reset_Handler
  .weak  Reset_Handler
  .type  Reset_Handler, %function
Reset_Handler:  
  ldr   sp, =_estack     /* set stack pointer */

/* Copy the data segment initializers from flash to SRAM */  
  ldr r0, =_sdata
  ldr r1, =_edata
  ldr r2, =_sidata
  movs r3, #0
  b LoopCopyDataInit

CopyDataInit:
  ldr r4, [r2, r3]
  str r4, [r0, r3]
  adds r3, r3, #4

LoopCopyDataInit:
  adds r4, r0, r3
  cmp r4, r1
  bcc CopyDataInit
  
/* Zero fill the bss segment. */
  ldr r2, =_sbss
  ldr r4, =_ebss
  movs r3, #0
  b LoopFillZerobss

FillZerobss:
  str  r3, [r2]
  adds r2, r2, #4

LoopFillZerobss:
  cmp r2, r4
  bcc FillZerobss

/* Call the clock system intitialization function.*/
  bl  SystemInit   
/* Call static constructors */
    bl __libc_init_array
/* Call the application's entry point.*/
  bl  entry
  bx  lr    
.size  Reset_Handler, .-Reset_Handler

/**
 * @brief  This is the code that gets called when the processor receives an 
 *         unexpected interrupt.  This simply enters an infinite loop, preserving
 *         the system state for examination by a debugger.
 * @param  None     
 * @retval None       
*/
    .section  .text.Default_Handler,"ax",%progbits
Default_Handler:
Infinite_Loop:
  b  Infinite_Loop
  .size  Default_Handler, .-Default_Handler
/******************************************************************************
*
* The minimal vector table for a Cortex M3. Note that the proper constructs
* must be placed on this to ensure that it ends up at physical address
* 0x0000.0000.
* 
*******************************************************************************/
   .section  .isr_vector,"a",%progbits
  .type  g_pfnVectors, %object
  .size  g_pfnVectors, .-g_pfnVectors
    

	
g_pfnVectors:
  .word  _estack
  .word  Reset_Handler

  .word  HardFault_Handler
  .word  HardFault_Handler
  .word  HardFault_Handler
  .word  HardFault_Handler
  .word  HardFault_Handler
  .word  0
  .word  0
  .word  0
  .word  0
  .word  SVC_Handler
  .word  DebugMon_Handler
  .word  0
  .word  PendSV_Handler
  .word  SysTick_Handler
  
  /* External Interrupts */
  .word     ISR_GlobalHandler                   /* Window WatchDog              */                                        
  .word     ISR_GlobalHandler                    /* PVD through EXTI Line detection */                        
  .word     ISR_GlobalHandler             /* Tamper and TimeStamps through the EXTI line */            
  .word     ISR_GlobalHandler               /* RTC Wakeup through the EXTI line */                      
  .word     ISR_GlobalHandler                  /* FLASH                        */                                          
  .word     ISR_GlobalHandler                    /* RCC                          */                                            
  .word     ISR_GlobalHandler                  /* EXTI Line0                   */                        
  .word     ISR_GlobalHandler                  /* EXTI Line1                   */                          
  .word     ISR_GlobalHandler                  /* EXTI Line2                   */                          
  .word     ISR_GlobalHandler                  /* EXTI Line3                   */                          
  .word     ISR_GlobalHandler                  /* EXTI Line4                   */                          
  .word     ISR_GlobalHandler           /* DMA1 Stream 0                */                  
  .word     ISR_GlobalHandler           /* DMA1 Stream 1                */                   
  .word     ISR_GlobalHandler           /* DMA1 Stream 2                */                   
  .word     ISR_GlobalHandler           /* DMA1 Stream 3                */                   
  .word     ISR_GlobalHandler           /* DMA1 Stream 4                */                   
  .word     ISR_GlobalHandler           /* DMA1 Stream 5                */                   
  .word     ISR_GlobalHandler           /* DMA1 Stream 6                */                   
  .word     ISR_GlobalHandler                    /* ADC1, ADC2 and ADC3s         */                   
  .word     ISR_GlobalHandler                /* CAN1 TX                      */                         
  .word     ISR_GlobalHandler               /* CAN1 RX0                     */                          
  .word     ISR_GlobalHandler               /* CAN1 RX1                     */                          
  .word     ISR_GlobalHandler               /* CAN1 SCE                     */                          
  .word     ISR_GlobalHandler                /* External Line[9:5]s          */                          
  .word     ISR_GlobalHandler          /* TIM1 Break and TIM9          */         
  .word     ISR_GlobalHandler          /* TIM1 Update and TIM10        */         
  .word     ISR_GlobalHandler     /* TIM1 Trigger and Commutation and TIM11 */
  .word     ISR_GlobalHandler                /* TIM1 Capture Compare         */                          
  .word     ISR_GlobalHandler                   /* TIM2                         */                   
  .word     ISR_GlobalHandler                   /* TIM3                         */                   
  .word     ISR_GlobalHandler                   /* TIM4                         */                   
  .word     ISR_GlobalHandler                /* I2C1 Event                   */                          
  .word     ISR_GlobalHandler                /* I2C1 Error                   */                          
  .word     ISR_GlobalHandler                /* I2C2 Event                   */                          
  .word     ISR_GlobalHandler                /* I2C2 Error                   */                            
  .word     ISR_GlobalHandler                   /* SPI1                         */                   
  .word     ISR_GlobalHandler                   /* SPI2                         */                   
  .word     ISR_GlobalHandler                 /* USART1                       */                   
  .word     ISR_GlobalHandler                 /* USART2                       */                   
  .word     ISR_GlobalHandler                 /* USART3                       */                   
  .word     ISR_GlobalHandler              /* External Line[15:10]s        */                          
  .word     ISR_GlobalHandler              /* RTC Alarm (A and B) through EXTI Line */                 
  .word     ISR_GlobalHandler            /* USB OTG FS Wakeup through EXTI line */                       
  .word     ISR_GlobalHandler         /* TIM8 Break and TIM12         */         
  .word     ISR_GlobalHandler          /* TIM8 Update and TIM13        */         
  .word     ISR_GlobalHandler     /* TIM8 Trigger and Commutation and TIM14 */
  .word     ISR_GlobalHandler                /* TIM8 Capture Compare         */                          
  .word     ISR_GlobalHandler           /* DMA1 Stream7                 */                          
  .word     ISR_GlobalHandler                   /* FSMC                         */                   
  .word     ISR_GlobalHandler                   /* SDIO                         */                   
  .word     ISR_GlobalHandler                   /* TIM5                         */                   
  .word     ISR_GlobalHandler                   /* SPI3                         */                   
  .word     ISR_GlobalHandler                  /* UART4                        */                   
  .word     ISR_GlobalHandler                  /* UART5                        */                   
  .word     ISR_GlobalHandler               /* TIM6 and DAC1&2 underrun errors */                   
  .word     ISR_GlobalHandler                   /* TIM7                         */
  .word     ISR_GlobalHandler           /* DMA2 Stream 0                */                   
  .word     ISR_GlobalHandler           /* DMA2 Stream 1                */                   
  .word     ISR_GlobalHandler           /* DMA2 Stream 2                */                   
  .word     ISR_GlobalHandler           /* DMA2 Stream 3                */                   
  .word     ISR_GlobalHandler           /* DMA2 Stream 4                */                   
  .word     ISR_GlobalHandler                    /* Ethernet                     */                   
  .word     ISR_GlobalHandler               /* Ethernet Wakeup through EXTI line */                     
  .word     ISR_GlobalHandler                /* CAN2 TX                      */                          
  .word     ISR_GlobalHandler               /* CAN2 RX0                     */                          
  .word     ISR_GlobalHandler               /* CAN2 RX1                     */                          
  .word     ISR_GlobalHandler               /* CAN2 SCE                     */                          
  .word     ISR_GlobalHandler                 /* USB OTG FS                   */                   
  .word     ISR_GlobalHandler           /* DMA2 Stream 5                */                   
  .word     ISR_GlobalHandler           /* DMA2 Stream 6                */                   
  .word     ISR_GlobalHandler           /* DMA2 Stream 7                */                   
  .word     ISR_GlobalHandler                 /* USART6                       */                    
  .word     ISR_GlobalHandler                /* I2C3 event                   */                          
  .word     ISR_GlobalHandler                /* I2C3 error                   */                          
  .word     ISR_GlobalHandler         /* USB OTG HS End Point 1 Out   */                   
  .word     ISR_GlobalHandler          /* USB OTG HS End Point 1 In    */                   
  .word     ISR_GlobalHandler            /* USB OTG HS Wakeup through EXTI */                         
  .word     ISR_GlobalHandler                 /* USB OTG HS                   */                   
  .word     ISR_GlobalHandler                   /* DCMI                         */                   
  .word     ISR_GlobalHandler                                /* CRYP crypto                  */                   
  .word     ISR_GlobalHandler               /* Hash and Rng                 */
  .word     ISR_GlobalHandler                    /* FPU                          */
  .word     ISR_GlobalHandler                  /* UART7                        */      
  .word     ISR_GlobalHandler                  /* UART8                        */
  .word     ISR_GlobalHandler                   /* SPI4                         */
  .word     ISR_GlobalHandler                   /* SPI5 						  */
  .word     ISR_GlobalHandler                   /* SPI6						  */
  .word     ISR_GlobalHandler                   /* SAI1						  */
  .word     ISR_GlobalHandler                   /* LTDC_IRQHandler			  */
  .word     ISR_GlobalHandler                /* LTDC_ER_IRQHandler			  */
  .word     ISR_GlobalHandler                  /* DMA2D                   

                      
/*******************************************************************************
*
* Provide weak aliases for each Exception handler to the Default_Handler. 
* As they are weak aliases, any function with the same name will override 
* this definition.
* 
*******************************************************************************/
   .weak      NMI_Handler
   .thumb_set NMI_Handler,Default_Handler
  
   .weak      HardFault_Handler
   .thumb_set HardFault_Handler,Default_Handler
  
   .weak      MemManage_Handler
   .thumb_set MemManage_Handler,Default_Handler
  
   .weak      BusFault_Handler
   .thumb_set BusFault_Handler,Default_Handler

   .weak      UsageFault_Handler
   .thumb_set UsageFault_Handler,Default_Handler

   .weak      SVC_Handler
   .thumb_set SVC_Handler,Default_Handler

   .weak      DebugMon_Handler
   .thumb_set DebugMon_Handler,Default_Handler

   .weak      PendSV_Handler
   .thumb_set PendSV_Handler,Default_Handler

   .weak      SysTick_Handler
   .thumb_set SysTick_Handler,Default_Handler