Please note: We are aware of an issue affecting replies on the Arm Community forums, which may not be loading as expected.

We apologize for any inconvenience and appreciate your patience while we investigate and work to resolve the issue.

Thank you for your understanding.

  • State Accepted Answer
  • +1 person also asked this people also asked this
  • Locked Locked
  • Replies 21 replies
  • Subscribers 347 subscribers
  • Views 26218 views
  • Users 0 members are here
Options
Related
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

I cannot write the sp register in the monitor mode

Takumi Shimada

I use a Cortex-A7 board and write start up code.

I try to use Security Extension.

I use `smc` instruction and make cpu mode monitor mode.

In the monitor handler, I tried to changed stack pointer value for calling other functions.

But after execute `ldr sp, =_stack_start`, sp value is 0x0 (Of course, _stack_start is not 0x0 and I check it in the assembler code).

Therefore, after `push` some registers and `pop` those registers, the data abort excetpions occurred!

How can I change the sp value?

Parents
  • 0 in reply to Juha Aaltonen

    I previously used SEGGER J-Link and SEGGER's gdb server to debug this board.

    It works without any board specific options. I don't need to write such a special program too.

    Therefore, I assume some parameters in my configuration file would be incorrect and no additional procedure such as RPi2 would be needed.

Reply
  • 0 in reply to Juha Aaltonen

    I previously used SEGGER J-Link and SEGGER's gdb server to debug this board.

    It works without any board specific options. I don't need to write such a special program too.

    Therefore, I assume some parameters in my configuration file would be incorrect and no additional procedure such as RPi2 would be needed.

Children