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Tue, 09 Sep 2025 05:53:50 -0700 (PDT) MIME-Version: 1.0 References: <430e84f1-b960-45e7-a617-8f88c083a800@eagercon.com> In-Reply-To: <430e84f1-b960-45e7-a617-8f88c083a800@eagercon.com> From: Gopi Kumar Bulusu Date: Tue, 9 Sep 2025 17:53:26 +0530 X-Gm-Features: AS18NWD0jvvllWlcWNlZy3HzEUYTSwoZzEBSufNyedSr3ZHCHLRMSfmFR15kjus Message-ID: Subject: Re: [PATCH] MicroBlaze: Update software breakpoint machine code as per MicroBlaze ISA To: Michael Eager Cc: gdb-patches@sourceware.org Content-Type: multipart/alternative; boundary="000000000000b39c0d063e5dcb1e" X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org --000000000000b39c0d063e5dcb1e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable namaskaaram On Tue, Sep 9, 2025 at 5:26=E2=80=AFPM Michael Eager w= rote: > 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 > > --000000000000b39c0d063e5dcb1e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
namaskaaram

On T= ue, Sep 9, 2025 at 5:26=E2=80=AFPM Michael Eager <eager@eagercon.com> wrote:
On 9/9/25 12:16 AM, Gopi Kumar Bulusu wro= te:
> namaskaaram,
> The macro MICROBLAZE_BREAKPOINT is set to an instruction opcode that <= br> > does not meet the criteria for software breakpoint instruction as set =
> forth in the AMD MicroBlaze ISA. This patch=C2=A0 addresses the proble= m.
>
> This simple patch concludes a series of patches that add AMD MicroBlaz= e
> gdbserver target support for GNU/Linux.
>
> Updated NEWS to include MicroBlaze gdbserver target.
>
> Build/Test - tested by building microblazeel-linux-gdb and verifying <= br> > 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 th= e AMD/Xilinx git sources (Yocto builds) for many many years. Breakpoints
work with bare metal (qemu).=C2=A0 From what I understand - the bar= e-metal case when using QEMU does not use a
software breakpo= int.

2. No, I have not checked Baremetal - real ta= rget, 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=C2=A0 a remote debug monitor for b= are metal targets
that may use software breakpoint.

Approved ?

dhanyavaadaaha
gopi

=C2=A0
--
Michael Eager

--000000000000b39c0d063e5dcb1e--