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[2620:137:e000::1:20]) by mx.google.com with ESMTP id a25-20020aa7cf19000000b004acbcd255b1si2411741edy.198.2023.04.12.03.36.09; Wed, 12 Apr 2023 03:36:32 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231410AbjDLKFi (ORCPT + 99 others); Wed, 12 Apr 2023 06:05:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230365AbjDLKFS (ORCPT ); Wed, 12 Apr 2023 06:05:18 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 0F65D7EDC for ; Wed, 12 Apr 2023 03:05:10 -0700 (PDT) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8CxTNpVgjZkviwbAA--.30731S3; Wed, 12 Apr 2023 18:05:09 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8DxSL1SgjZke9wgAA--.34313S6; Wed, 12 Apr 2023 18:05:09 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , WANG Xuerui Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn Subject: [PATCH v1 4/4] LoongArch: Add uprobes support Date: Wed, 12 Apr 2023 18:05:01 +0800 Message-Id: <1681293901-24918-5-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1681293901-24918-1-git-send-email-yangtiezhu@loongson.cn> References: <1681293901-24918-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf8DxSL1SgjZke9wgAA--.34313S6 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjvJXoW3GryDXF45tF13ZFyxCF1rZwb_yoW3Kr1fpa yDCF90gF4DG3Z3Jry7JrZ8Zr1FyrWkWw47ZFy2ka4Sya12qryrJr1IqrWqvF1rA39YgFW0 qa4rKFWY9FW3JaUanT9S1TB71UUUUUJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b3xYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4 x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Cr1j6rxdM2kK e7AKxVWUXVWUAwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI 0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUtVWrXwAv7VC2z280 aVAFwI0_Gr0_Cr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxAIw28Icx kI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI1I0E14v26r1Y6r17MI8I3I0E 5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUAV WUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26ryj6F1UMIIF0xvE2Ix0cI8IcVCY 1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI 0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7I U8EeHDUUUUU== 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?1762966417095434872?= X-GMAIL-MSGID: =?utf-8?q?1762966417095434872?= Uprobes is the user-space counterpart to kprobes, this commit adds uprobes support for LoongArch. Here is a simple example with CONFIG_UPROBE_EVENTS=y: # cat test.c #include int add(int a, int b) { return a + b; } int main() { return add(2, 7); } # gcc test.c -o /tmp/test # nm /tmp/test | grep add 0000000120004194 T add # cd /sys/kernel/debug/tracing # echo > uprobe_events # echo "p:myuprobe /tmp/test:0x4194 %r4 %r5" > uprobe_events # echo "r:myuretprobe /tmp/test:0x4194 %r4" >> uprobe_events # echo 1 > events/uprobes/enable # echo 1 > tracing_on # /tmp/test # cat trace ... # TASK-PID CPU# ||||| TIMESTAMP FUNCTION # | | | ||||| | | test-1060 [001] DNZff 1015.770620: myuprobe: (0x120004194) arg1=0x2 arg2=0x7 test-1060 [001] DNZff 1015.770930: myuretprobe: (0x1200041f0 <- 0x120004194) arg1=0x9 Signed-off-by: Tiezhu Yang --- arch/loongarch/Kconfig | 3 + arch/loongarch/include/asm/uprobes.h | 36 ++++++++++ arch/loongarch/kernel/Makefile | 1 + arch/loongarch/kernel/traps.c | 9 ++- arch/loongarch/kernel/uprobes.c | 135 +++++++++++++++++++++++++++++++++++ 5 files changed, 179 insertions(+), 5 deletions(-) create mode 100644 arch/loongarch/include/asm/uprobes.h create mode 100644 arch/loongarch/kernel/uprobes.c diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 7fd5125..ab66ad2 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -574,6 +574,9 @@ config ARCH_MMAP_RND_BITS_MIN config ARCH_MMAP_RND_BITS_MAX default 18 +config ARCH_SUPPORTS_UPROBES + def_bool y + menu "Power management options" config ARCH_SUSPEND_POSSIBLE diff --git a/arch/loongarch/include/asm/uprobes.h b/arch/loongarch/include/asm/uprobes.h new file mode 100644 index 0000000..c6ffcb7 --- /dev/null +++ b/arch/loongarch/include/asm/uprobes.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __ASM_LOONGARCH_UPROBES_H +#define __ASM_LOONGARCH_UPROBES_H + +#include + +typedef u32 uprobe_opcode_t; + +#define MAX_UINSN_BYTES LOONGARCH_INSN_SIZE +#define UPROBE_XOL_SLOT_BYTES MAX_UINSN_BYTES + +#define UPROBE_XOLBP_INSN larch_insn_gen_break(BRK_UPROBE_XOLBP) +#define UPROBE_SWBP_INSN larch_insn_gen_break(BRK_UPROBE_BP) +#define UPROBE_SWBP_INSN_SIZE LOONGARCH_INSN_SIZE + +struct arch_uprobe { + union { + u32 insn[MAX_UINSN_BYTES]; + u32 ixol[MAX_UINSN_BYTES]; + }; + bool simulate; +}; + +struct arch_uprobe_task { + unsigned long saved_trap_nr; +}; + +#ifdef CONFIG_UPROBES +bool uprobe_breakpoint_handler(struct pt_regs *regs); +bool uprobe_singlestep_handler(struct pt_regs *regs); +#else /* !CONFIG_UPROBES */ +static inline bool uprobe_breakpoint_handler(struct pt_regs *regs) { return false; } +static inline bool uprobe_singlestep_handler(struct pt_regs *regs) { return false; } +#endif /* CONFIG_UPROBES */ + +#endif /* __ASM_LOONGARCH_UPROBES_H */ diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile index 78d4e33..67b9c26 100644 --- a/arch/loongarch/kernel/Makefile +++ b/arch/loongarch/kernel/Makefile @@ -53,5 +53,6 @@ obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o obj-$(CONFIG_KPROBES) += kprobes.o kprobes_trampoline.o +obj-$(CONFIG_UPROBES) += uprobes.o CPPFLAGS_vmlinux.lds := $(KBUILD_CFLAGS) diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c index de8ebe2..cfc2e0c 100644 --- a/arch/loongarch/kernel/traps.c +++ b/arch/loongarch/kernel/traps.c @@ -45,6 +45,7 @@ #include #include #include +#include #include "access-helper.h" @@ -440,7 +441,6 @@ asmlinkage void noinstr do_bp(struct pt_regs *regs) if (regs->csr_prmd & CSR_PRMD_PIE) local_irq_enable(); - current->thread.trap_nr = read_csr_excode(); if (__get_inst(&opcode, (u32 *)era, user)) goto out_sigsegv; @@ -462,18 +462,17 @@ asmlinkage void noinstr do_bp(struct pt_regs *regs) else break; case BRK_UPROBE_BP: - if (notify_die(DIE_UPROBE, "Uprobe", regs, bcode, - current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP) + if (uprobe_breakpoint_handler(regs)) goto out; else break; case BRK_UPROBE_XOLBP: - if (notify_die(DIE_UPROBE_XOL, "Uprobe_XOL", regs, bcode, - current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP) + if (uprobe_singlestep_handler(regs)) goto out; else break; default: + current->thread.trap_nr = read_csr_excode(); if (notify_die(DIE_TRAP, "Break", regs, bcode, current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP) goto out; diff --git a/arch/loongarch/kernel/uprobes.c b/arch/loongarch/kernel/uprobes.c new file mode 100644 index 0000000..1b0e2de --- /dev/null +++ b/arch/loongarch/kernel/uprobes.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include + +#define UPROBE_TRAP_NR UINT_MAX + +int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, + struct mm_struct *mm, unsigned long addr) +{ + if (addr & 0x3) + return -EILSEQ; + + if (insns_not_supported(auprobe->insn[0])) + return -EINVAL; + + if (insns_need_simulation(auprobe->insn[0])) { + auprobe->ixol[0] = larch_insn_gen_nop(); + auprobe->simulate = true; + } else { + auprobe->ixol[0] = auprobe->insn[0]; + auprobe->simulate = false; + } + + auprobe->ixol[1] = UPROBE_XOLBP_INSN; + + return 0; +} + +int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct uprobe_task *utask = current->utask; + + utask->autask.saved_trap_nr = current->thread.trap_nr; + current->thread.trap_nr = UPROBE_TRAP_NR; + instruction_pointer_set(regs, utask->xol_vaddr); + + return 0; +} + +int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct uprobe_task *utask = current->utask; + + WARN_ON_ONCE(current->thread.trap_nr != UPROBE_TRAP_NR); + current->thread.trap_nr = utask->autask.saved_trap_nr; + instruction_pointer_set(regs, utask->vaddr + 4); + + return 0; +} + +void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct uprobe_task *utask = current->utask; + + current->thread.trap_nr = utask->autask.saved_trap_nr; + instruction_pointer_set(regs, utask->vaddr); +} + +bool arch_uprobe_xol_was_trapped(struct task_struct *t) +{ + if (t->thread.trap_nr != UPROBE_TRAP_NR) + return true; + + return false; +} + +bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + if (!auprobe->simulate) + return false; + + arch_simulate_insn(auprobe->insn[0], regs); + + return true; +} + +unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, + struct pt_regs *regs) +{ + unsigned long ra = regs->regs[1]; + + regs->regs[1] = trampoline_vaddr; + + return ra; +} + +bool arch_uretprobe_is_alive(struct return_instance *ret, + enum rp_check ctx, struct pt_regs *regs) +{ + if (ctx == RP_CHECK_CHAIN_CALL) + return regs->regs[3] <= ret->stack; + else + return regs->regs[3] < ret->stack; +} + +int arch_uprobe_exception_notify(struct notifier_block *self, + unsigned long val, void *data) +{ + return NOTIFY_DONE; +} + +bool uprobe_breakpoint_handler(struct pt_regs *regs) +{ + if (uprobe_pre_sstep_notifier(regs)) + return true; + + return false; +} + +bool uprobe_singlestep_handler(struct pt_regs *regs) +{ + if (uprobe_post_sstep_notifier(regs)) + return true; + + return false; +} + +unsigned long uprobe_get_swbp_addr(struct pt_regs *regs) +{ + return instruction_pointer(regs); +} + +void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr, + void *src, unsigned long len) +{ + void *kaddr = kmap_local_page(page); + void *dst = kaddr + (vaddr & ~PAGE_MASK); + + memcpy(dst, src, len); + flush_icache_range((unsigned long)dst, (unsigned long)dst + len); + kunmap_local(kaddr); +}