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[123.195.35.41]) by smtp.gmail.com with ESMTPSA id g30sm12097660pgn.40.2020.03.31.08.23.36 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 31 Mar 2020 08:23:39 -0700 (PDT) From: Vincent Chen To: jason.wessel@windriver.com, daniel.thompson@linaro.org, dianders@chromium.org, paul.walmsley@sifive.com, palmer@dabbelt.com Subject: [PATCH v2 3/5] kgdb: enable arch to support XML packet support. Date: Tue, 31 Mar 2020 23:23:09 +0800 Message-Id: <1585668191-16287-4-git-send-email-vincent.chen@sifive.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1585668191-16287-1-git-send-email-vincent.chen@sifive.com> References: <1585668191-16287-1-git-send-email-vincent.chen@sifive.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200331_085157_703176_10171D36 X-CRM114-Status: GOOD ( 13.08 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kgdb-bugreport@lists.sourceforge.net, linux-riscv@lists.infradead.org, Vincent Chen Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org The XML packet could be supported by required architecture if the architecture defines CONFIG_ACRH_SUPPORTS_GDB_XML and implement its own arch_handle_qxfer_pkt(). Except for the arch_handle_qxfer_pkt(), the architecture also needs to record the feature supported by gdb stub into the arch_gdb_stub_feature, and these features will be reported to host gdb when gdb stub receives the qSupported packet. Signed-off-by: Vincent Chen --- include/linux/kgdb.h | 9 +++++++++ kernel/debug/gdbstub.c | 13 +++++++++++++ lib/Kconfig.kgdb | 5 +++++ 3 files changed, 27 insertions(+) diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h index b072aeb1fd78..ee9109d2f056 100644 --- a/include/linux/kgdb.h +++ b/include/linux/kgdb.h @@ -177,6 +177,15 @@ kgdb_arch_handle_exception(int vector, int signo, int err_code, struct pt_regs *regs); /** + * arch_handle_qxfer_pkt - Handle architecture specific GDB XML packets. + * @remcom_in_buffer: The buffer of the packet we have read. + * @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into. + */ + +extern void +arch_handle_qxfer_pkt(char *remcom_in_buffer, char *remcom_out_buffer); + +/** * kgdb_call_nmi_hook - Call kgdb_nmicallback() on the current CPU * @ignored: This parameter is only here to match the prototype. * diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c index 4b280fc7dd67..d6b1b630a7e7 100644 --- a/kernel/debug/gdbstub.c +++ b/kernel/debug/gdbstub.c @@ -792,6 +792,19 @@ static void gdb_cmd_query(struct kgdb_state *ks) } break; #endif +#ifdef CONFIG_ACRH_SUPPORTS_GDB_XML + case 'S': + if (!strncmp(remcom_in_buffer, "qSupported:", 11)) + strcpy(remcom_out_buffer, arch_gdb_stub_feature); + break; + case 'X': + if (!strncmp(remcom_in_buffer, "qXfer:", 6)) + arch_handle_qxfer_pkt(remcom_in_buffer, + remcom_out_buffer); + break; +#endif + default: + break; } } diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb index 933680b59e2d..5b586a3bba90 100644 --- a/lib/Kconfig.kgdb +++ b/lib/Kconfig.kgdb @@ -3,6 +3,11 @@ config HAVE_ARCH_KGDB bool +# set if architecture implemented the arch_handle_qxfer_pkt function +# to enable gdb stub to address XML packet sent from GDB. +config ARCH_SUPPORTS_GDB_XML + bool + menuconfig KGDB bool "KGDB: kernel debugger" depends on HAVE_ARCH_KGDB -- 2.7.4