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Glenn Glenn Washburn (2): scripts/gdb: Correct indentation in get_current_task scripts/gdb: Support getting current task struct in UML scripts/gdb/linux/cpus.py | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) Range-diff against v1: 1: f33ebe524590 ! 1: c5a916e094d9 scripts/gdb: Correct indentation in get_current_task @@ Commit message There is an extra space in a couple blocks in get_current_task. Though python does not care, let's make the spacing consistent. + Also, format better an if expression, removing unneeded parenthesis. ## scripts/gdb/linux/cpus.py ## @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): - raise gdb.GdbError("Sorry, obtaining the current task is not allowed " - "while running in userspace(EL0)") + current_task_addr = gdb.parse_and_eval("$SP_EL0") -+ if((current_task_addr >> 63) != 0): ++ if (current_task_addr >> 63) != 0: + current_task = current_task_addr.cast(task_ptr_type) + return current_task.dereference() + else: 2: 8c3db2291f58 ! 2: 683d10e752cd scripts/gdb: Support getting current task struct in UML @@ Commit message A running x86 UML kernel reports with architecture "i386:x86-64" as it is a sub-architecture. However, a difference with bare-metal x86 kernels is in how it manages tasks and the current task struct. To - identify that the inferior is a UML kernel and not bare-metal, the - symbol "uml_kmalloc" is checked for. If it exists, then do the UML - specific way of getting the current task struct. + identify that the inferior is a UML kernel and not bare-metal, check + for the existence of the UML specific symbol "cpu_tasks" which + contains the current task struct. ## scripts/gdb/linux/cpus.py ## @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): if utils.is_target_arch("x86"): - var_ptr = gdb.parse_and_eval("¤t_task") - return per_cpu(var_ptr, cpu).dereference() -+ if gdb.lookup_global_symbol("uml_kmalloc"): ++ if gdb.lookup_global_symbol("cpu_tasks"): ++ # This is a UML kernel, which stores the current task ++ # differently than other x86 sub architectures + var_ptr = gdb.parse_and_eval("(struct task_struct *)cpu_tasks[0].task") + return var_ptr.dereference() + else: @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): + return per_cpu(var_ptr, cpu).dereference() elif utils.is_target_arch("aarch64"): current_task_addr = gdb.parse_and_eval("$SP_EL0") - if((current_task_addr >> 63) != 0): + if (current_task_addr >> 63) != 0: -- 2.30.2 _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B9B2AC636D6 for ; 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Fri, 17 Feb 2023 17:13:02 -0800 (PST) From: Glenn Washburn To: Jan Kiszka , Kieran Bingham Cc: linux-kernel@vger.kernel.org, Andrew Morton , Glenn Washburn , linux-um , Richard Weinberger , Johannes Berg , Anton Ivanov Subject: [PATCH v2 0/2] GDB: Support getting current task struct in UML Date: Fri, 17 Feb 2023 19:11:52 -0600 Message-ID: X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230217_171305_271336_9D21466D X-CRM114-Status: GOOD ( 11.72 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org Message-ID: <20230218011152.WEF5PeMDNoVdyEsniCYyPim9uLro8tpaus3z69hqCSk@z> Added suggestions from Jan. Glenn Glenn Washburn (2): scripts/gdb: Correct indentation in get_current_task scripts/gdb: Support getting current task struct in UML scripts/gdb/linux/cpus.py | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) Range-diff against v1: 1: f33ebe524590 ! 1: c5a916e094d9 scripts/gdb: Correct indentation in get_current_task @@ Commit message There is an extra space in a couple blocks in get_current_task. Though python does not care, let's make the spacing consistent. + Also, format better an if expression, removing unneeded parenthesis. ## scripts/gdb/linux/cpus.py ## @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): - raise gdb.GdbError("Sorry, obtaining the current task is not allowed " - "while running in userspace(EL0)") + current_task_addr = gdb.parse_and_eval("$SP_EL0") -+ if((current_task_addr >> 63) != 0): ++ if (current_task_addr >> 63) != 0: + current_task = current_task_addr.cast(task_ptr_type) + return current_task.dereference() + else: 2: 8c3db2291f58 ! 2: 683d10e752cd scripts/gdb: Support getting current task struct in UML @@ Commit message A running x86 UML kernel reports with architecture "i386:x86-64" as it is a sub-architecture. However, a difference with bare-metal x86 kernels is in how it manages tasks and the current task struct. To - identify that the inferior is a UML kernel and not bare-metal, the - symbol "uml_kmalloc" is checked for. If it exists, then do the UML - specific way of getting the current task struct. + identify that the inferior is a UML kernel and not bare-metal, check + for the existence of the UML specific symbol "cpu_tasks" which + contains the current task struct. ## scripts/gdb/linux/cpus.py ## @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): if utils.is_target_arch("x86"): - var_ptr = gdb.parse_and_eval("¤t_task") - return per_cpu(var_ptr, cpu).dereference() -+ if gdb.lookup_global_symbol("uml_kmalloc"): ++ if gdb.lookup_global_symbol("cpu_tasks"): ++ # This is a UML kernel, which stores the current task ++ # differently than other x86 sub architectures + var_ptr = gdb.parse_and_eval("(struct task_struct *)cpu_tasks[0].task") + return var_ptr.dereference() + else: @@ scripts/gdb/linux/cpus.py: def get_current_task(cpu): + return per_cpu(var_ptr, cpu).dereference() elif utils.is_target_arch("aarch64"): current_task_addr = gdb.parse_and_eval("$SP_EL0") - if((current_task_addr >> 63) != 0): + if (current_task_addr >> 63) != 0: -- 2.30.2 _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um