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ESMTP id 0E5286EBB for ; Sat, 14 Jan 2023 01:27:32 -0800 (PST) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8CxjfCCdcJjYJ0BAA--.5563S3; Sat, 14 Jan 2023 17:27:31 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bxb+SBdcJjcVYZAA--.11667S2; Sat, 14 Jan 2023 17:27:30 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , WANG Xuerui , Masami Hiramatsu Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v11 0/6] Add kprobe and kretprobe support for LoongArch Date: Sat, 14 Jan 2023 17:27:18 +0800 Message-Id: <1673688444-24251-1-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 X-CM-TRANSID: AQAAf8Bxb+SBdcJjcVYZAA--.11667S2 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjvJXoWxJw1kZry3uF18CrWfAw1fWFg_yoW5tw1kpF ZrArn5tr4rWrySvr9xt347ur1Sqw4kG3y7W3W7GrWru3W3XryUZr4xKrsrXFy8Gw4Fqr1I 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vjxU74lkDUUUU X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_PASS, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754989604338485381?= X-GMAIL-MSGID: =?utf-8?q?1754989604338485381?= v11: -- Rebase on the latest code -- Address all the review comments, thank you all -- Modify arch_prepare_kprobe() and setup_singlestep() to make the probe logic more clear -- Mark some assembler symbols as non-kprobe-able -- Use common function sign_extend64() -- Test 20 times about 36 hours for all the 71 assembler functions annotated with SYM_CODE_START and SYM_FUNC_START under arch/loongarch, especially test memset alone for 10 hours, no hang problems v10: -- Remove sign_extend() based on the latest code -- Rename insns_are_not_supported() to insns_not_supported() -- Rename insns_are_not_simulated() to insns_not_simulated() -- Set KPROBE_HIT_SSDONE if cur->post_handler is not NULL -- Enable preemption for KPROBE_REENTER in kprobe_fault_handler() v9: -- Rename sign_extended() to sign_extend() -- Modify kprobe_fault_handler() to handle all of kprobe_status v8: -- Put "regs->csr_prmd &= ~CSR_PRMD_PIE;" ahead to save one line -- Add code comment of preempt_disable() -- Put kprobe_page_fault() in __do_page_fault() -- Modify the check condition of break insn in kprobe_breakpoint_handler() v7: -- Remove stop_machine_cpuslocked() related code v6: -- Add a new patch to redefine larch_insn_patch_text() with stop_machine_cpuslocked() -- Modify kprobe_breakpoint_handler() to consider the original insn is break and return the correct value -- Modify do_bp() to refresh bcode when original insn is break v5: -- Rebase on the latest code -- Use stop_machine_cpuslocked() to modify insn to avoid CPU race v4: -- Remove kprobe_exceptions_notify() in kprobes.c -- Call kprobe_breakpoint_handler() and kprobe_singlestep_handler() in do_bp() v3: -- Rebase on the latest code -- Check the alignment of PC in simu_branch() and simu_pc() -- Add ibar in flush_insn_slot() -- Rename kprobe_{pre,post}_handler() to {post_}kprobe_handler -- Add preempt_disable() and preempt_enable_no_resched() -- Remove r0 save/restore and do some minor changes in kprobes_trampoline.S -- Do not enable CONFIG_KPROBES by default v2: -- Split simu_branch() and simu_pc() into a single patch -- Call kprobe_page_fault() in do_page_fault() -- Add kprobes_trampoline.S for kretprobe Tiezhu Yang (6): LoongArch: Simulate branch and PC* instructions LoongArch: Add kprobe support LoongArch: Add kretprobe support LoongArch: Mark some assembler symbols as non-kprobe-able samples/kprobes: Add LoongArch support LoongArch: Use common function sign_extend64() arch/loongarch/Kconfig | 2 + arch/loongarch/include/asm/asm.h | 10 + arch/loongarch/include/asm/inst.h | 28 +- arch/loongarch/include/asm/kprobes.h | 58 +++++ arch/loongarch/include/asm/ptrace.h | 1 + arch/loongarch/kernel/Makefile | 2 + arch/loongarch/kernel/alternative.c | 6 +- arch/loongarch/kernel/entry.S | 1 + arch/loongarch/kernel/inst.c | 123 +++++++++ arch/loongarch/kernel/kprobes.c | 405 +++++++++++++++++++++++++++++ arch/loongarch/kernel/kprobes_trampoline.S | 96 +++++++ arch/loongarch/kernel/traps.c | 11 +- arch/loongarch/lib/memcpy.S | 3 + arch/loongarch/mm/fault.c | 3 + samples/kprobes/kprobe_example.c | 8 + 15 files changed, 741 insertions(+), 16 deletions(-) create mode 100644 arch/loongarch/include/asm/kprobes.h create mode 100644 arch/loongarch/kernel/kprobes.c create mode 100644 arch/loongarch/kernel/kprobes_trampoline.S