[SOLVED] gdbserver + gdb + generic semihosting

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  • [SOLVED] gdbserver + gdb + generic semihosting

    I am using your implementation of semihosting to do file I/O (the generic one with SEGGER_SEMIHOST_DebugHalt and no bkpt). Everything works great under Ozone. Now I would like to execute that under gdb.
    I start arm-none-eabi-gdb my_project.elf. My gdb session is:

    Source Code

    1. target remote localhost:2331
    2. monitor semihosting enable
    3. monitor semihosting breakOnError 1
    4. monitor reset
    5. load
    6. continue
    I have a BKPT after my file I/O. It is reached almost immediately (it takes ~1 minute to do all the I/O under Ozone), no files are created, nothing happens. I don't see any error messages.

    Am I enabling semihosting correctly? Do I have to switch to the BKPT 0xAB method?


    Thanks for help

    The post was edited 1 time, last by artur ().

  • Hi,

    When using GDB, you first need to decide which way to go:
    #1 Have GDB handling the semihosting requests
    #2 Have J-Link GDB Server handling the semihosting requests

    Then you need to determine what approach your target application is following:
    #a Using SWI / SVC calls + vector catch for semihosting
    #b Target application has breakpoint instructions compiled in the code for semihosting

    wiki.segger.com/Semihosting#Semihosting_with_GCC_and_newlib
    wiki.segger.com/J-Link_GDB_Ser…te_.28monitor.29_commands

    There is no generic approach, it depends on your application / library how the printf / scanf / fopen / ... calls are implemented on the low-level.
    Please read the forum rules before posting.

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