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I am trying to make some automation testing with an embedded application running in an ARM Microcontroller. For the I/O exchange I have setup the Semihosting using arm-none-eabi-gdb as GDB client:

arm-none-eabi-gdb my_binary.axf -ex "target localhost::3333" -ex"load" -ex "continue"

After launching the GDB session I am able to use printf(), scanf() to interact with the user through the GDB console.

I am now desperately trying to make Python read and write to/from the gdb console in order to substitute the user, but the results so far have been poor.

This is the best solution I tried without any success:

  • Create a new gdb console into a separate pseudo terminal with the following GDB command:

(gdb) new-ui console /dev/ptyp0

and let Python open/read/write the device /dev/ttyp0. The connections seems to be properly established but I am not able to neither read nor write any data from the GDB console.

(ref: https://sourceware.org/gdb/onlinedocs/gdb/Interpreters.html)

Which is the best way to solve this problem?

I am totally running out of solutions here and it would be great to know is someone has already tried to do the same thing.

Improve this question
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  • Use pexpect to write a script that controls an interactive application. Commented Jul 30, 2022 at 17:44
  • @Barmar seems to be a good idea but I have to exchange binary strings to send commands and receive responses. Commented Jul 30, 2022 at 17:50
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