Jumping from one firmware to another in MCU internal FLASH

Question

I am currently working on a bootloader firmware application targeted to STM32F030C8. I specified in my scatter file that the bootloader app will occupy main memory location

Answer 1

In file 'startup_stm32f03xx.s', make sure that you have the following piece of code:

EXTERN  HardFault_Handler_C        ; this declaration is probably missing

__tx_vectors                       ; this declaration is probably there
    DCD     HardFault_Handler

Then, in the same file, add the following interrupt handler (where all other handlers are located):

    PUBWEAK HardFault_Handler
    SECTION .text:CODE:REORDER(1)
HardFault_Handler
    TST LR, #4
    ITE EQ
    MRSEQ R0, MSP
    MRSNE R0, PSP
    B HardFault_Handler_C

Then, in file 'stm32f03xx.c', add the following ISR:

void HardFault_Handler_C(unsigned int* hardfault_args)
{
    printf("R0    = 0x%.8X\r\n",hardfault_args[0]);         
    printf("R1    = 0x%.8X\r\n",hardfault_args[1]);         
    printf("R2    = 0x%.8X\r\n",hardfault_args[2]);         
    printf("R3    = 0x%.8X\r\n",hardfault_args[3]);         
    printf("R12   = 0x%.8X\r\n",hardfault_args[4]);         
    printf("LR    = 0x%.8X\r\n",hardfault_args[5]);         
    printf("PC    = 0x%.8X\r\n",hardfault_args[6]);         
    printf("PSR   = 0x%.8X\r\n",hardfault_args[7]);         
    printf("BFAR  = 0x%.8X\r\n",*(unsigned int*)0xE000ED38);
    printf("CFSR  = 0x%.8X\r\n",*(unsigned int*)0xE000ED28);
    printf("HFSR  = 0x%.8X\r\n",*(unsigned int*)0xE000ED2C);
    printf("DFSR  = 0x%.8X\r\n",*(unsigned int*)0xE000ED30);
    printf("AFSR  = 0x%.8X\r\n",*(unsigned int*)0xE000ED3C);
    printf("SHCSR = 0x%.8X\r\n",SCB->SHCSR);                
    while (1);
}

If you can't use printf at the point in the execution when this specific Hard-Fault interrupt occurs, then save all the above data in a global buffer instead, so you can view it after reaching the while (1).

Then, refer to the 'Cortex-M Fault Exceptions and Registers' section at http://www.keil.com/appnotes/files/apnt209.pdf in order to understand the problem, or publish the output here if you want further assistance.