Using qemu (user mode) with gdb testsuites

Using qemu (user mode) with gdb testsuites

[Meg Yuan via Gdb]

Hi there,

I'm wondering if it is possible to use qemu as gdbserver when running gdb
testsuites from a riscv cross-compiler with dejagnu.

Here is an example of starting qemu (user mode) with the program at
localhost:1234:

qemu-riscv64 -g 1234 <program>

Then, we can start gdb with connection to qemu with this command:

riscv64-unknown-linux-gnu-gdb <program> -ex "target remote localhost:1234"

I am new to dejagnu. Though I tried some existing recipes, none worked out
of the box. Has anyone done this before? If so, could you give me a recipe
for an exp file?

Thanks,
Meg

Re: Using qemu (user mode) with gdb testsuites

[Luis Machado via Gdb]

On 10/2/24 01:01, Meg Yuan via Gdb wrote:
> Hi there,
> 
> I'm wondering if it is possible to use qemu as gdbserver when running gdb
> testsuites from a riscv cross-compiler with dejagnu.
> 
> Here is an example of starting qemu (user mode) with the program at
> localhost:1234:
> 
> qemu-riscv64 -g 1234 <program>
> 
> Then, we can start gdb with connection to qemu with this command:
> 
> riscv64-unknown-linux-gnu-gdb <program> -ex "target remote localhost:1234"
> 
> I am new to dejagnu. Though I tried some existing recipes, none worked out
> of the box. Has anyone done this before? If so, could you give me a recipe
> for an exp file?
> 
> Thanks,
> Meg

It is possible to do it, but you'll need some additional layers of expect code (board files)
that override functions like gdbserver startup (firing up qemu-user) and other things.

I don't think we have this in upstream gdb at the moment, unfortunately.