Re: [PATCH] MicroBlaze: Update software breakpoint machine code as per MicroBlaze ISA

[Gopi Kumar Bulusu <gopi@sankhya.com>]

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namaskaaram

On Tue, Sep 9, 2025 at 5:26 PM Michael Eager <eager@eagercon.com> wrote:

> On 9/9/25 12:16 AM, Gopi Kumar Bulusu wrote:
> > namaskaaram,
> > The macro MICROBLAZE_BREAKPOINT is set to an instruction opcode that
> > does not meet the criteria for software breakpoint instruction as set
> > forth in the AMD MicroBlaze ISA. This patch  addresses the problem.
> >
> > This simple patch concludes a series of patches that add AMD MicroBlaze
> > gdbserver target support for GNU/Linux.
> >
> > Updated NEWS to include MicroBlaze gdbserver target.
> >
> > Build/Test - tested by building microblazeel-linux-gdb and verifying
> > that software breakpoint works
> > using gdbserver as target.
>
>
> Has this patch been tested with bare metal targets?
>
>
1. Yes, This patch has been part of the AMD/Xilinx git sources (Yocto
builds) for many many years. Breakpoints
work with bare metal (qemu).  From what I understand - the bare-metal case
when using QEMU does not use a
software breakpoint.

2. No, I have not checked Baremetal - real target, but when using BDM/JTAG
this may not matter. However I don't see
currently JTAG supported from gdb for MicroBlaze (does it ?).

3. I also don't see any indication that gdb for MicroBlaze includes support
for  a remote debug monitor for bare metal targets
that may use software breakpoint.

Approved ?

dhanyavaadaaha
gopi



> --
> Michael Eager
>
>

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