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Breakpoints not working in C code, only in assembly?

Danijel

I am running some example program in ARM Development Studio using FVP (fixed virtual platforms) simulator for A53. 

All is OK, I can run the app.

However, the problem is the breakpoints: they don't work in C code, the work only in .S files assembly. 

What could be the problem? 

Model parameters are -C bp.secure_memory=false -C cache_state_modelled=0. 

Parents
  • 0

    Hello

    I have a very similar problem with ARM DS 2021.2.

    I am running the Cortex R52 startup example code (startup_Cortex-R52.axf) on a virtual platform using FVP and ARM Fast Models.

    When a breakpoint is put in the C code (main.c or sort.c), the code never stops on them.

    When a breakpoint has been put in the file startup.s, there is no problem.

    I have read this thread and understood that this problem could be related to the exception level at which the code is executed.

    So, according to Ronan's reply, I added the following command into the default debug configuration for R52:

    add-symbol-file "${workspace_loc:/startup_Cortex-R52/startup_Cortex-R52.axf}" EL1N:0

    But it does not work, unfortunately.

    So my question is : what is the exception level in R52 at which the main.c is executed ?Maybe the configuration for A53 and R52 is not the same in this case ?

    or is there any other trick to perform in ARM DS ?

    Best Regards

    Frederic

Reply
  • 0

    Hello

    I have a very similar problem with ARM DS 2021.2.

    I am running the Cortex R52 startup example code (startup_Cortex-R52.axf) on a virtual platform using FVP and ARM Fast Models.

    When a breakpoint is put in the C code (main.c or sort.c), the code never stops on them.

    When a breakpoint has been put in the file startup.s, there is no problem.

    I have read this thread and understood that this problem could be related to the exception level at which the code is executed.

    So, according to Ronan's reply, I added the following command into the default debug configuration for R52:

    add-symbol-file "${workspace_loc:/startup_Cortex-R52/startup_Cortex-R52.axf}" EL1N:0

    But it does not work, unfortunately.

    So my question is : what is the exception level in R52 at which the main.c is executed ?Maybe the configuration for A53 and R52 is not the same in this case ?

    or is there any other trick to perform in ARM DS ?

    Best Regards

    Frederic

Children
  • 0 in reply to FredericH

    I would add that at execution time, the commands window shows me the following error :

    ERROR(ITR14-COR274):
    ! "EL1N:0" is not a valid address
    ! The address space "EL1N:" is not available on this target

    So i guess this trick is not OK for the R52

  • 0 Arm Employee Badge in reply to FredericH

    The startup_Cortex-R52 example comes with a ready-made debug launcher that already contains the command you require:
    add-symbol-file "${workspace_loc:/startup_Cortex-R52/startup_Cortex-R52.axf}" N:0

    Processors that support the AArch64 instruction set, such as Cortex-A53, have Exception Levels 0 to 3 - see developer.arm.com/.../Privilege-and-Exception-levels
    The Cortex-R52, which supports the AArch32 instruction set, also has ELs, but these map to AArch32 modes: EL2 (Hypervisor), EL1 (SVC, SYS, FIQ, IRQ, SVC, ABT, UNDEF) and EL0 (User).

    In Arm DS Debugger commands, EL2 (Hypervisor) is represented by the address space prefix: "H:", and the other modes by "N:" (c.f. Non-secure).

    You can use the "H:" and "N:" address space prefixes in front of any address, for example, when loading symbols (e.g. with the add-symbol-file command example above), or when specifying a memory address in the Memory view, or when specifying a breakpoint, e.g.:
    break N:compare_sorts

    The Address Spaces supported by a target can be viewed with:
    info memory

    Hope this helps

    Stephen