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CCS/TMS570LS0914: memset - undefEntry after program change

Alexander Wiegel
Prodigy 30 points
Part Number: TMS570LS0914


Tool/software: Code Composer Studio

Program was working fine, but when i changed something there it crashes at some point. The problem seems to be memset... do I need to include it in the memory, if yes why was it working before?

Somewhere in the main method:

...

uint8_t data[8] = {0};
     0800 8E8C  MOV          R1, #0x00
     0800 8E90  ADD          R0, SP, #0x18
     0800 8E94  MOV          R2, #0x08
     0800 8E98  BL             0x08009018

when you step into it you get the following:

$ARM
0800 9018 LDR    R12, =memset    ; [0x08009020] =0x000200C3
0800 901c BX     R12

and it jumps into undefEntry and crashes.

  • 0
    TI__Mastermind 49120 points

    It looks like you are executing code from RAM as well as Flash. Is the memset routine located at address 0x000200C3? Can you force the functions to be aligned to a 32-bit-aligned address?

    Also, when the CPU is at the underEntry, you can look at the link register (R14) to identify the instruction that caused the undefined instruction exception. This will give you a better hint for what caused the error.

    Regards, Sunil

  • 0 in reply to Sunil Oak
    Prodigy 30 points

    Sunil Oak said:

    It looks like you are executing code from RAM as well as Flash.

    Yes exactly. Most of the functions are located in RAM (for example main)

    Sunil Oak said:

    Is the memset routine located at address 0x000200C3?

    Yes, the program tries to access a function that is stored in Flash from RAM code

    Sunil Oak said:

    Can you force the functions to be aligned to a 32-bit-aligned address?

    How can we do that?

    Sunil Oak said:

    Also, when the CPU is at the underEntry, you can look at the link register (R14) to identify the instruction that caused the undefined instruction exception. This will give you a better hint for what caused the error.

    The exact line that causes the undefEntry is the following:

    0800 9018 LDR    R12, =memset    ; [0x08009020] =0x000200C3

  • 0 in reply to Alexander Wiegel
    TI__Mastermind 49120 points

    You can align sections using the linker command file constructs. See the "align" keyword for linker command files in this document: 

    Do you have valid code at address 0x0800_9018? Did the application program this location with the valid code to jump to the memset routine?