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[88.21.204.71]) by smtp.gmail.com with ESMTPSA id o6sm1999775wrp.3.2020.05.27.00.19.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 May 2020 00:19:40 -0700 (PDT) Subject: Re: GDB get wrong debug infos on TI DSP architecture extension To: casmac <1482995675@qq.com>, qemu-devel References: From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <8b83e11b-e593-b7db-48b6-252e23c599da@amsat.org> Date: Wed, 27 May 2020 09:19:39 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::442; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wr1-x442.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Taylor Simpson , =?UTF-8?Q?Alex_Benn=c3=a9e?= , Luc Michel Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi Xiaolei, Cc'ing more developers who might answer you. On 5/27/20 8:48 AM, casmac wrote: > Hi all, >    I am working on a TI DSP architecture extension for QEMU. FYI you can find the TI TMS320C6x target implemented here: https://github.com/philmd/qemu/releases/tag/target-c6x-2.4 I started rebasing it to QEMU 4.2 but then got distracted. > Now, we are > adding GDB debugging features. >    We have done the following, but not sure we are on the right track : >    - add a xml description file in gdb-xml, without understanding the > purpose of the file, why some architectures don't provide such xml file? >    - add ***_cpu_gdb_read_register(), ***_cpu_gdb_write_register(); >    - added  dsp_cpu_get_phys_page_attrs_debug(), but uncertain about > what to return >      dsp_cpu_get_phys_page_attrs_debug(CPUState *cs, vaddr addr, > MemTxAttrs *attrs) >      { >         return addr & TARGET_PAGE_MASK;   >      } >    >    We run QEMU with the these arguments >    qemu-system-dsp ... -kernel filename.out -S -s >    >    It turns out that gdb reads incorrect register values, and complains > : "warning: Target-supplied registers are not supported by the current > architecture". >    >    Something is missing here, or we do it in a wrong way.  Any advise > would be helpful to us. >    >    Thanks. >     > xiaolei > >    ----- ti_dsp.xml  ----- >    >    > > >     >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   > >