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[2620:137:e000::1:20]) by mx.google.com with ESMTP id g24-20020a50d0d8000000b0045938ab7129si10653655edf.330.2022.11.28.18.07.15; Mon, 28 Nov 2022 18:07:38 -0800 (PST) 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 S235058AbiK2CDO (ORCPT + 99 others); Mon, 28 Nov 2022 21:03:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50320 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235085AbiK2CDK (ORCPT ); Mon, 28 Nov 2022 21:03:10 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 46E9E13D71 for ; Mon, 28 Nov 2022 18:03:05 -0800 (PST) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8Dx++pXaIVjLeIBAA--.4421S3; Tue, 29 Nov 2022 10:03:03 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8AxPuBUaIVjPdsdAA--.10463S3; Tue, 29 Nov 2022 10:03:02 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , WANG Xuerui , Masami Hiramatsu Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v5 1/4] LoongArch: Simulate branch and PC instructions Date: Tue, 29 Nov 2022 10:02:51 +0800 Message-Id: <1669687374-16432-2-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1669687374-16432-1-git-send-email-yangtiezhu@loongson.cn> References: <1669687374-16432-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf8AxPuBUaIVjPdsdAA--.10463S3 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjvJXoW3WrWkAF4kWFyxWF1kXF1UWrg_yoWxGr1Upr W29r4kCr4DWr93CrWjqr1kXr15tr4fur43uwnxCw13CFy7uFy5GrykWr4jvFyYkw4Utry0 gayftw429F4SyaUanT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b28YFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l84 ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AKxVW8Jr0_Cr1U M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx1l5I8CrVACY4 xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r126r1DMcIj6I8E87Iv67AKxVWUJVW8 JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I 8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AK xVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcV AFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8I cIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r 1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x07j83kZUUUUU= 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?1750794406250227347?= X-GMAIL-MSGID: =?utf-8?q?1750794406250227347?= According to LoongArch Reference Manual, simulate branch and PC instructions, this is preparation for later patch. Link: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#branch-instructions Link: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#_pcaddi_pcaddu121_pcaddu18l_pcalau12i Co-developed-by: Jinyang He Signed-off-by: Jinyang He Signed-off-by: Tiezhu Yang --- arch/loongarch/include/asm/inst.h | 12 ++++ arch/loongarch/include/asm/ptrace.h | 1 + arch/loongarch/kernel/inst.c | 123 ++++++++++++++++++++++++++++++++++++ 3 files changed, 136 insertions(+) diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h index 6cd994d..a91798b 100644 --- a/arch/loongarch/include/asm/inst.h +++ b/arch/loongarch/include/asm/inst.h @@ -7,6 +7,7 @@ #include #include +#include #define INSN_NOP 0x03400000 #define INSN_BREAK 0x002a0000 @@ -32,6 +33,7 @@ enum reg1i20_op { lu12iw_op = 0x0a, lu32id_op = 0x0b, pcaddi_op = 0x0c, + pcalau12i_op = 0x0d, pcaddu12i_op = 0x0e, pcaddu18i_op = 0x0f, }; @@ -366,6 +368,16 @@ u32 larch_insn_gen_lu12iw(enum loongarch_gpr rd, int imm); u32 larch_insn_gen_lu32id(enum loongarch_gpr rd, int imm); u32 larch_insn_gen_lu52id(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm); u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, unsigned long pc, unsigned long dest); +void simu_branch(struct pt_regs *regs, union loongarch_instruction insn); +void simu_pc(struct pt_regs *regs, union loongarch_instruction insn); + +static inline unsigned long sign_extended(unsigned long val, unsigned int idx) +{ + if (val & (1UL << idx)) + return ~((1UL << (idx + 1)) - 1) | val; + else + return ((1UL << (idx + 1)) - 1) & val; +} static inline bool signed_imm_check(long val, unsigned int bit) { diff --git a/arch/loongarch/include/asm/ptrace.h b/arch/loongarch/include/asm/ptrace.h index 59c4608..58596c4 100644 --- a/arch/loongarch/include/asm/ptrace.h +++ b/arch/loongarch/include/asm/ptrace.h @@ -6,6 +6,7 @@ #define _ASM_PTRACE_H #include +#include #include #include diff --git a/arch/loongarch/kernel/inst.c b/arch/loongarch/kernel/inst.c index 512579d..aaaf9de 100644 --- a/arch/loongarch/kernel/inst.c +++ b/arch/loongarch/kernel/inst.c @@ -165,3 +165,126 @@ u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, unsigned l return insn.word; } + +void simu_branch(struct pt_regs *regs, union loongarch_instruction insn) +{ + unsigned int imm, imm_l, imm_h, rd, rj; + unsigned long pc = regs->csr_era; + + if (pc & 3) { + pr_warn("%s: invalid pc 0x%lx\n", __func__, pc); + return; + } + + imm_l = insn.reg0i26_format.immediate_l; + imm_h = insn.reg0i26_format.immediate_h; + switch (insn.reg0i26_format.opcode) { + case b_op: + regs->csr_era = pc + sign_extended((imm_h << 16 | imm_l) << 2, 27); + return; + case bl_op: + regs->csr_era = pc + sign_extended((imm_h << 16 | imm_l) << 2, 27); + regs->regs[1] = pc + LOONGARCH_INSN_SIZE; + return; + } + + imm_l = insn.reg1i21_format.immediate_l; + imm_h = insn.reg1i21_format.immediate_h; + rj = insn.reg1i21_format.rj; + switch (insn.reg1i21_format.opcode) { + case beqz_op: + if (regs->regs[rj] == 0) + regs->csr_era = pc + sign_extended((imm_h << 16 | imm_l) << 2, 22); + else + regs->csr_era = pc + LOONGARCH_INSN_SIZE; + return; + case bnez_op: + if (regs->regs[rj] != 0) + regs->csr_era = pc + sign_extended((imm_h << 16 | imm_l) << 2, 22); + else + regs->csr_era = pc + LOONGARCH_INSN_SIZE; + return; + } + + imm = insn.reg2i16_format.immediate; + rj = insn.reg2i16_format.rj; + rd = insn.reg2i16_format.rd; + switch (insn.reg2i16_format.opcode) { + case beq_op: + if (regs->regs[rj] == regs->regs[rd]) + regs->csr_era = pc + sign_extended(imm << 2, 17); + else + regs->csr_era = pc + LOONGARCH_INSN_SIZE; + break; + case bne_op: + if (regs->regs[rj] != regs->regs[rd]) + regs->csr_era = pc + sign_extended(imm << 2, 17); + else + regs->csr_era = pc + LOONGARCH_INSN_SIZE; + break; + case blt_op: + if ((long)regs->regs[rj] < (long)regs->regs[rd]) + regs->csr_era = pc + sign_extended(imm << 2, 17); + else + regs->csr_era = pc + LOONGARCH_INSN_SIZE; + break; + case bge_op: + if ((long)regs->regs[rj] >= (long)regs->regs[rd]) + regs->csr_era = pc + sign_extended(imm << 2, 17); + else + regs->csr_era = pc + LOONGARCH_INSN_SIZE; + break; + case bltu_op: + if (regs->regs[rj] < regs->regs[rd]) + regs->csr_era = pc + sign_extended(imm << 2, 17); + else + regs->csr_era = pc + LOONGARCH_INSN_SIZE; + break; + case bgeu_op: + if (regs->regs[rj] >= regs->regs[rd]) + regs->csr_era = pc + sign_extended(imm << 2, 17); + else + regs->csr_era = pc + LOONGARCH_INSN_SIZE; + break; + case jirl_op: + regs->csr_era = regs->regs[rj] + sign_extended(imm << 2, 17); + regs->regs[rd] = pc + LOONGARCH_INSN_SIZE; + break; + default: + pr_info("%s: unknown opcode\n", __func__); + return; + } +} + +void simu_pc(struct pt_regs *regs, union loongarch_instruction insn) +{ + unsigned long pc = regs->csr_era; + unsigned int rd = insn.reg1i20_format.rd; + unsigned int imm = insn.reg1i20_format.immediate; + + if (pc & 3) { + pr_warn("%s: invalid pc 0x%lx\n", __func__, pc); + return; + } + + switch (insn.reg1i20_format.opcode) { + case pcaddi_op: + regs->regs[rd] = pc + sign_extended(imm << 2, 21); + break; + case pcaddu12i_op: + regs->regs[rd] = pc + sign_extended(imm << 12, 31); + break; + case pcaddu18i_op: + regs->regs[rd] = pc + sign_extended(imm << 18, 37); + break; + case pcalau12i_op: + regs->regs[rd] = pc + sign_extended(imm << 12, 31); + regs->regs[rd] &= ~((1 << 12) - 1); + break; + default: + pr_info("%s: unknown opcode\n", __func__); + return; + } + + regs->csr_era += LOONGARCH_INSN_SIZE; +} From patchwork Tue Nov 29 02:02:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tiezhu Yang X-Patchwork-Id: 27032 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:f944:0:0:0:0:0 with SMTP id q4csp76197wrr; Mon, 28 Nov 2022 18:15:20 -0800 (PST) X-Google-Smtp-Source: AA0mqf6K3AgBUDEJOU7hxovZeVl5xQ8fqfaq5XuE3i8GbWzAl9TBhvq5SQGrEol/s0qDA/zL9ewf X-Received: by 2002:a05:6a00:a88:b0:574:2c5e:b18c with SMTP id b8-20020a056a000a8800b005742c5eb18cmr31600367pfl.10.1669688120263; Mon, 28 Nov 2022 18:15:20 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1669688120; cv=none; d=google.com; s=arc-20160816; b=ujfovNJpyHb0NUj6KirwQSOhP9KPrbc5AXTSQ4HKkbR+ClBjoQ2r4ROEGps4EiPxpp s3VDWs/kmeLoLpZjMZHKIjl7Va24sUowlkt8l0035O4MLapmeJ1P8bMFbqZkv3vh/amu u/EYd7pJUVuHdBzh+LMa694kg6peXotA/4z9UmCQCoNV2GzySLVmunOtMge+MMZB4s2v Rp5lCfyGIlL4xKMMooH+WUc0XoqXEL35ZL2ygXmFnPYW04umjOW+HKxpKHpAaVemLz/d sCtP+VAPgCHyvvlLhlj2Py51Ru3ANFZNoddvHjCyUKjdYGuAUzNmpFiC+6MKWjmPgEeH xFug== ARC-Message-Signature: i=1; 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[2620:137:e000::1:20]) by mx.google.com with ESMTP id k13-20020a63d10d000000b0047679fcf773si13224418pgg.478.2022.11.28.18.14.38; Mon, 28 Nov 2022 18:15:20 -0800 (PST) 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 S235150AbiK2CDT (ORCPT + 99 others); Mon, 28 Nov 2022 21:03:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234969AbiK2CDK (ORCPT ); Mon, 28 Nov 2022 21:03:10 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 02DEC95B8 for ; Mon, 28 Nov 2022 18:03:05 -0800 (PST) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8Dx9vBYaIVjMeIBAA--.4472S3; Tue, 29 Nov 2022 10:03:04 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8AxPuBUaIVjPdsdAA--.10463S4; Tue, 29 Nov 2022 10:03:04 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , WANG Xuerui , Masami Hiramatsu Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v5 2/4] LoongArch: Add kprobe support Date: Tue, 29 Nov 2022 10:02:52 +0800 Message-Id: <1669687374-16432-3-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1669687374-16432-1-git-send-email-yangtiezhu@loongson.cn> References: <1669687374-16432-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf8AxPuBUaIVjPdsdAA--.10463S4 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjvAXoW3KryUtF43CF1rZw1xJr1fWFg_yoW8Xr1rAo WSvF4DXw48Gr47uF45Ar1kXFWUu3W8KFZ5Aryayanxur1kAr1rXr1UC3y8J3W2qrsYgw4f u34Y9w1fGFW3Crnxn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7ZEXasCq-sGcSsGvf J3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnRJU UUkIb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2IYs7xG6rWj6s 0DM7CIcVAFz4kK6r1Y6r17M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr0_Gr1UM2 8EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gr1j6F4U JwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI0UMc02F40EFc xC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUtVWrXwAv7VC2z280aVAFwI0_Gr0_ Cr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxAIw28IcxkI7VAKI48JMx C20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAF wI0_JrI_JrWlx4CE17CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20x vE14v26r1I6r4UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v2 0xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxV W8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7IU8l38UUUUUU== 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?1750794890369518766?= X-GMAIL-MSGID: =?utf-8?q?1750794890369518766?= Kprobes allows you to trap at almost any kernel address and execute a callback function, this commit adds kprobe support for LoongArch. Signed-off-by: Tiezhu Yang --- arch/loongarch/Kconfig | 1 + arch/loongarch/include/asm/inst.h | 10 ++ arch/loongarch/include/asm/kprobes.h | 65 +++++++ arch/loongarch/kernel/Makefile | 2 + arch/loongarch/kernel/kprobes.c | 326 +++++++++++++++++++++++++++++++++++ arch/loongarch/kernel/traps.c | 6 +- arch/loongarch/mm/fault.c | 4 + 7 files changed, 410 insertions(+), 4 deletions(-) create mode 100644 arch/loongarch/include/asm/kprobes.h create mode 100644 arch/loongarch/kernel/kprobes.c diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 5c4f1dc..925d46d 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -102,6 +102,7 @@ config LOONGARCH select HAVE_IOREMAP_PROT select HAVE_IRQ_EXIT_ON_IRQ_STACK select HAVE_IRQ_TIME_ACCOUNTING + select HAVE_KPROBES select HAVE_MOD_ARCH_SPECIFIC select HAVE_NMI select HAVE_PCI diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h index a91798b..f5fb2be 100644 --- a/arch/loongarch/include/asm/inst.h +++ b/arch/loongarch/include/asm/inst.h @@ -24,6 +24,10 @@ #define ADDR_IMM(addr, INSN) ((addr & ADDR_IMMMASK_##INSN) >> ADDR_IMMSHIFT_##INSN) +enum reg0i15_op { + break_op = 0x54, +}; + enum reg0i26_op { b_op = 0x14, bl_op = 0x15, @@ -180,6 +184,11 @@ enum reg3sa2_op { alsld_op = 0x16, }; +struct reg0i15_format { + unsigned int immediate : 15; + unsigned int opcode : 17; +}; + struct reg0i26_format { unsigned int immediate_h : 10; unsigned int immediate_l : 16; @@ -265,6 +274,7 @@ struct reg3sa2_format { union loongarch_instruction { unsigned int word; + struct reg0i15_format reg0i15_format; struct reg0i26_format reg0i26_format; struct reg1i20_format reg1i20_format; struct reg1i21_format reg1i21_format; diff --git a/arch/loongarch/include/asm/kprobes.h b/arch/loongarch/include/asm/kprobes.h new file mode 100644 index 0000000..e2d0729 --- /dev/null +++ b/arch/loongarch/include/asm/kprobes.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __ASM_LOONGARCH_KPROBES_H +#define __ASM_LOONGARCH_KPROBES_H + +#include +#include + +#ifdef CONFIG_KPROBES + +#include + +#define __ARCH_WANT_KPROBES_INSN_SLOT +#define MAX_INSN_SIZE 2 + +#define flush_insn_slot(p) \ +do { \ + if (p->addr) \ + flush_icache_range((unsigned long)p->addr, \ + (unsigned long)p->addr + \ + (MAX_INSN_SIZE * sizeof(kprobe_opcode_t))); \ +} while (0) + +#define kretprobe_blacklist_size 0 + +typedef union loongarch_instruction kprobe_opcode_t; + +/* Architecture specific copy of original instruction */ +struct arch_specific_insn { + /* copy of the original instruction */ + kprobe_opcode_t *insn; +}; + +struct prev_kprobe { + struct kprobe *kp; + unsigned long status; + unsigned long saved_irq; + unsigned long saved_era; +}; + +/* per-cpu kprobe control block */ +struct kprobe_ctlblk { + unsigned long kprobe_status; + unsigned long kprobe_saved_irq; + unsigned long kprobe_saved_era; + struct prev_kprobe prev_kprobe; +}; + +struct patch_insn { + void *addr; + union loongarch_instruction insn; + atomic_t cpu_count; +}; + +void arch_remove_kprobe(struct kprobe *p); +bool kprobe_fault_handler(struct pt_regs *regs, int trapnr); +bool kprobe_breakpoint_handler(struct pt_regs *regs); +bool kprobe_singlestep_handler(struct pt_regs *regs); + +#else /* !CONFIG_KPROBES */ + +static inline bool kprobe_breakpoint_handler(struct pt_regs *regs) { return 0; } +static inline bool kprobe_singlestep_handler(struct pt_regs *regs) { return 0; } + +#endif /* CONFIG_KPROBES */ +#endif /* __ASM_LOONGARCH_KPROBES_H */ diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile index 27a5b62..a87b7f5 100644 --- a/arch/loongarch/kernel/Makefile +++ b/arch/loongarch/kernel/Makefile @@ -47,4 +47,6 @@ obj-$(CONFIG_UNWINDER_PROLOGUE) += unwind_prologue.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o +obj-$(CONFIG_KPROBES) += kprobes.o + CPPFLAGS_vmlinux.lds := $(KBUILD_CFLAGS) diff --git a/arch/loongarch/kernel/kprobes.c b/arch/loongarch/kernel/kprobes.c new file mode 100644 index 0000000..d01ecb2 --- /dev/null +++ b/arch/loongarch/kernel/kprobes.c @@ -0,0 +1,326 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include + +static const union loongarch_instruction breakpoint_insn = { + .reg0i15_format = { + .opcode = break_op, + .immediate = BRK_KPROBE_BP, + } +}; + +static const union loongarch_instruction singlestep_insn = { + .reg0i15_format = { + .opcode = break_op, + .immediate = BRK_KPROBE_SSTEPBP, + } +}; + +DEFINE_PER_CPU(struct kprobe *, current_kprobe); +DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); + +static bool insns_are_not_supported(union loongarch_instruction insn) +{ + switch (insn.reg2i14_format.opcode) { + case llw_op: + case lld_op: + case scw_op: + case scd_op: + pr_notice("kprobe: ll or sc instructions are not supported\n"); + return true; + } + + switch (insn.reg1i21_format.opcode) { + case bceqz_op: + pr_notice("kprobe: bceqz or bcnez instructions are not supported\n"); + return true; + } + + return false; +} +NOKPROBE_SYMBOL(insns_are_not_supported); + +int arch_prepare_kprobe(struct kprobe *p) +{ + union loongarch_instruction insn; + + insn = p->addr[0]; + if (insns_are_not_supported(insn)) + return -EINVAL; + + p->ainsn.insn = get_insn_slot(); + if (!p->ainsn.insn) + return -ENOMEM; + + p->ainsn.insn[0] = *p->addr; + p->ainsn.insn[1] = singlestep_insn; + + p->opcode = *p->addr; + + return 0; +} +NOKPROBE_SYMBOL(arch_prepare_kprobe); + +static int patch_text_cb(void *data) +{ + struct patch_insn *param = data; + int ret = 0; + + if (atomic_inc_return(¶m->cpu_count) == num_online_cpus()) { + ret = larch_insn_patch_text(param->addr, param->insn.word); + atomic_inc(¶m->cpu_count); + } else { + while (atomic_read(¶m->cpu_count) <= num_online_cpus()) + cpu_relax(); + smp_mb(); + } + + return ret; +} +NOKPROBE_SYMBOL(patch_text_cb); + +static int patch_text(void *addr, union loongarch_instruction insn) +{ + struct patch_insn param = { addr, insn, ATOMIC_INIT(0) }; + + return stop_machine_cpuslocked(patch_text_cb, ¶m, cpu_online_mask); +} +NOKPROBE_SYMBOL(patch_text); + +/* Install breakpoint in text */ +void arch_arm_kprobe(struct kprobe *p) +{ + patch_text(p->addr, breakpoint_insn); +} +NOKPROBE_SYMBOL(arch_arm_kprobe); + +/* Remove breakpoint from text */ +void arch_disarm_kprobe(struct kprobe *p) +{ + patch_text(p->addr, p->opcode); +} +NOKPROBE_SYMBOL(arch_disarm_kprobe); + +void arch_remove_kprobe(struct kprobe *p) +{ + if (p->ainsn.insn) { + free_insn_slot(p->ainsn.insn, 0); + p->ainsn.insn = NULL; + } +} +NOKPROBE_SYMBOL(arch_remove_kprobe); + +static void save_previous_kprobe(struct kprobe_ctlblk *kcb) +{ + kcb->prev_kprobe.kp = kprobe_running(); + kcb->prev_kprobe.status = kcb->kprobe_status; + kcb->prev_kprobe.saved_irq = kcb->kprobe_saved_irq; + kcb->prev_kprobe.saved_era = kcb->kprobe_saved_era; +} +NOKPROBE_SYMBOL(save_previous_kprobe); + +static void restore_previous_kprobe(struct kprobe_ctlblk *kcb) +{ + __this_cpu_write(current_kprobe, kcb->prev_kprobe.kp); + kcb->kprobe_status = kcb->prev_kprobe.status; + kcb->kprobe_saved_irq = kcb->prev_kprobe.saved_irq; + kcb->kprobe_saved_era = kcb->prev_kprobe.saved_era; +} +NOKPROBE_SYMBOL(restore_previous_kprobe); + +static void set_current_kprobe(struct kprobe *p, struct pt_regs *regs, + struct kprobe_ctlblk *kcb) +{ + __this_cpu_write(current_kprobe, p); + kcb->kprobe_saved_irq = regs->csr_prmd & CSR_PRMD_PIE; + kcb->kprobe_saved_era = regs->csr_era; +} +NOKPROBE_SYMBOL(set_current_kprobe); + +static bool insns_are_not_simulated(struct kprobe *p, struct pt_regs *regs) +{ + if (is_branch_ins(&p->opcode)) { + simu_branch(regs, p->opcode); + return false; + } else if (is_pc_ins(&p->opcode)) { + simu_pc(regs, p->opcode); + return false; + } else { + return true; + } +} +NOKPROBE_SYMBOL(insns_are_not_simulated); + +static void setup_singlestep(struct kprobe *p, struct pt_regs *regs, + struct kprobe_ctlblk *kcb, int reenter) +{ + if (reenter) { + save_previous_kprobe(kcb); + set_current_kprobe(p, regs, kcb); + kcb->kprobe_status = KPROBE_REENTER; + } else { + kcb->kprobe_status = KPROBE_HIT_SS; + } + + if (p->ainsn.insn->word == breakpoint_insn.word) { + regs->csr_prmd &= ~CSR_PRMD_PIE; + regs->csr_prmd |= kcb->kprobe_saved_irq; + preempt_enable_no_resched(); + return; + } + + regs->csr_prmd &= ~CSR_PRMD_PIE; + + if (insns_are_not_simulated(p, regs)) { + kcb->kprobe_status = KPROBE_HIT_SS; + regs->csr_era = (unsigned long)&p->ainsn.insn[0]; + } else { + kcb->kprobe_status = KPROBE_HIT_SSDONE; + if (p->post_handler) + p->post_handler(p, regs, 0); + reset_current_kprobe(); + preempt_enable_no_resched(); + } +} +NOKPROBE_SYMBOL(setup_singlestep); + +static bool reenter_kprobe(struct kprobe *p, struct pt_regs *regs, + struct kprobe_ctlblk *kcb) +{ + switch (kcb->kprobe_status) { + case KPROBE_HIT_SSDONE: + case KPROBE_HIT_ACTIVE: + kprobes_inc_nmissed_count(p); + setup_singlestep(p, regs, kcb, 1); + break; + case KPROBE_HIT_SS: + case KPROBE_REENTER: + pr_warn("Failed to recover from reentered kprobes.\n"); + dump_kprobe(p); + BUG(); + break; + default: + WARN_ON(1); + return false; + } + + return true; +} +NOKPROBE_SYMBOL(reenter_kprobe); + +bool kprobe_breakpoint_handler(struct pt_regs *regs) +{ + struct kprobe *p, *cur_kprobe; + struct kprobe_ctlblk *kcb; + unsigned long addr = instruction_pointer(regs); + + preempt_disable(); + kcb = get_kprobe_ctlblk(); + cur_kprobe = kprobe_running(); + + p = get_kprobe((kprobe_opcode_t *)addr); + if (p) { + if (cur_kprobe) { + if (reenter_kprobe(p, regs, kcb)) + return true; + } else { + /* Probe hit */ + set_current_kprobe(p, regs, kcb); + kcb->kprobe_status = KPROBE_HIT_ACTIVE; + + /* + * If we have no pre-handler or it returned 0, we + * continue with normal processing. If we have a + * pre-handler and it returned non-zero, it will + * modify the execution path and no need to single + * stepping. Let's just reset current kprobe and exit. + * + * pre_handler can hit a breakpoint and can step thru + * before return. + */ + if (!p->pre_handler || !p->pre_handler(p, regs)) { + setup_singlestep(p, regs, kcb, 0); + } else { + reset_current_kprobe(); + preempt_enable_no_resched(); + } + } + return true; + } + + /* + * The breakpoint instruction was removed right + * after we hit it. Another cpu has removed + * either a probepoint or a debugger breakpoint + * at this address. In either case, no further + * handling of this interrupt is appropriate. + * Return back to original instruction, and continue. + */ + preempt_enable_no_resched(); + return false; +} +NOKPROBE_SYMBOL(kprobe_breakpoint_handler); + +bool kprobe_singlestep_handler(struct pt_regs *regs) +{ + struct kprobe *cur = kprobe_running(); + struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); + + if (!cur) + return false; + + /* Restore back the original saved kprobes variables and continue */ + if (kcb->kprobe_status == KPROBE_REENTER) { + restore_previous_kprobe(kcb); + goto out; + } + + /* Call post handler */ + kcb->kprobe_status = KPROBE_HIT_SSDONE; + if (cur->post_handler) + cur->post_handler(cur, regs, 0); + + regs->csr_era = kcb->kprobe_saved_era + LOONGARCH_INSN_SIZE; + regs->csr_prmd |= kcb->kprobe_saved_irq; + + reset_current_kprobe(); +out: + preempt_enable_no_resched(); + + return true; +} +NOKPROBE_SYMBOL(kprobe_singlestep_handler); + +bool kprobe_fault_handler(struct pt_regs *regs, int trapnr) +{ + struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); + + if (kcb->kprobe_status & KPROBE_HIT_SS) { + regs->csr_era = kcb->kprobe_saved_era + LOONGARCH_INSN_SIZE; + regs->csr_prmd |= kcb->kprobe_saved_irq; + + reset_current_kprobe(); + preempt_enable_no_resched(); + } + + return false; +} +NOKPROBE_SYMBOL(kprobe_fault_handler); + +/* + * Provide a blacklist of symbols identifying ranges which cannot be kprobed. + * This blacklist is exposed to userspace via debugfs (kprobes/blacklist). + */ +int __init arch_populate_kprobe_blacklist(void) +{ + return kprobe_add_area_blacklist((unsigned long)__irqentry_text_start, + (unsigned long)__irqentry_text_end); +} + +int __init arch_init_kprobes(void) +{ + return 0; +} diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c index 7ea62fa..8525446 100644 --- a/arch/loongarch/kernel/traps.c +++ b/arch/loongarch/kernel/traps.c @@ -448,14 +448,12 @@ asmlinkage void noinstr do_bp(struct pt_regs *regs) */ switch (bcode) { case BRK_KPROBE_BP: - if (notify_die(DIE_BREAK, "Kprobe", regs, bcode, - current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP) + if (kprobe_breakpoint_handler(regs)) goto out; else break; case BRK_KPROBE_SSTEPBP: - if (notify_die(DIE_SSTEPBP, "Kprobe_SingleStep", regs, bcode, - current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP) + if (kprobe_singlestep_handler(regs)) goto out; else break; diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c index 1ccd536..fc9225a 100644 --- a/arch/loongarch/mm/fault.c +++ b/arch/loongarch/mm/fault.c @@ -253,12 +253,16 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, { irqentry_state_t state = irqentry_enter(regs); + if (kprobe_page_fault(regs, current->thread.trap_nr)) + goto out; + /* Enable interrupt if enabled in parent context */ if (likely(regs->csr_prmd & CSR_PRMD_PIE)) local_irq_enable(); __do_page_fault(regs, write, address); +out: local_irq_disable(); irqentry_exit(regs, state); From patchwork Tue Nov 29 02:02:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tiezhu Yang X-Patchwork-Id: 27034 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:f944:0:0:0:0:0 with SMTP id q4csp79137wrr; Mon, 28 Nov 2022 18:22:46 -0800 (PST) X-Google-Smtp-Source: AA0mqf70l0W7SkYZ9rXWsZyKxzbwyUG08JfpYAqZdAN5+PGL/OzKgUmK7jJzWwJdzlmSI5QnqpR4 X-Received: by 2002:a17:907:3f8a:b0:7bf:4ae6:c36 with SMTP id hr10-20020a1709073f8a00b007bf4ae60c36mr8341701ejc.674.1669688566609; Mon, 28 Nov 2022 18:22:46 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1669688566; cv=none; d=google.com; s=arc-20160816; b=gDOsQixEFMf73FbUe7y2aI0sin+MsS6VgJqQyXWBpDel+YlnUn/SvI2LaSnv/7vr+w YDrA2ucT+omz/zMQPGmMST7mETDJ6Vh53Yh2KzLT1C2VvPYbfZ1Wv9LesrRpA8giBYkE 3xfHWDappzTwwPe/gAmzGvvN6Muyc2PPF1VM/aSydbrAd0q9ifzC/saustd7b/pXS2i1 G03edh8RJQeygwKMCyujzQt+kT8ITbPihYODZgpjboTExdg4phyDlFsDLsRRK+S5vWvB vApszxPlgmpvy3G4oQg3atfXxwAwG1+rrd1R6N8Xpnk8DUhiPIB11tkNXs25zXjQ6Uw4 as8A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:references:in-reply-to:message-id:date:subject :cc:to:from; bh=8aQ4FXJfiErSEcHUgamtAm4yRbAC1SItWmvVrGK5eTM=; b=F2Y2XrtJaRLr8zQq/rdUOp9Sq9Xcq5j8uK7laQIF0ATh5mnsCW7f0cm6mM/AW4RnQV ubhC3uXxVvTJjFv0phiDhKO7UC9jvmhj3yvESNUL8QJyVRgi1lJJhtWKG6mEnR+TY+Op SENOnA6cvYWnmAzhoBGK6LItFGt3rkzzELIzodnpqOAcNPpORrDaZmkfUTYTGHq8Mf2p FXow4IKFCf5oQvgu8kQyvgRyK2Yz8U8ptSpMfXgTKC0S9gxdtsulVC6Or5hrmSzDF26j 489DyXWsZBsuSIJyF2zNRDVfC2eqKR2CdoW/KhiiP+o9f5zPSa3CeSit7OxyCpSZkRKy jFpA== ARC-Authentication-Results: i=1; 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: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id bb4-20020a1709070a0400b007b28c6790edsi3780190ejc.205.2022.11.28.18.22.23; Mon, 28 Nov 2022 18:22:46 -0800 (PST) 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 S235131AbiK2CD0 (ORCPT + 99 others); Mon, 28 Nov 2022 21:03:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235110AbiK2CDM (ORCPT ); Mon, 28 Nov 2022 21:03:12 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 4E0DB18364 for ; Mon, 28 Nov 2022 18:03:08 -0800 (PST) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8AxjutbaIVjO+IBAA--.4604S3; Tue, 29 Nov 2022 10:03:07 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8AxPuBUaIVjPdsdAA--.10463S5; Tue, 29 Nov 2022 10:03:04 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , WANG Xuerui , Masami Hiramatsu Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v5 3/4] LoongArch: Add kretprobe support Date: Tue, 29 Nov 2022 10:02:53 +0800 Message-Id: <1669687374-16432-4-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1669687374-16432-1-git-send-email-yangtiezhu@loongson.cn> References: <1669687374-16432-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf8AxPuBUaIVjPdsdAA--.10463S5 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjvJXoWxGFWrZw45JF4kWFWxXFW5KFg_yoWrtr48pF 9rArn8Zr4I9rnYvr93trWF9FyUXr1kua12gFy7JrWrWF48Wr1UXr1xGr9rZF43Kws8Jr1S qr1fGrWYyFW3J37anT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b2xYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l84 ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AKxVW8Jr0_Cr1U M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx1l5I8CrVACY4 xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5McIj6I8E87Iv67AKxVW8JVWx JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I 8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AK xVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcV AFwI0_Gr0_Xr1lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8I cIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r 4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU2F4iUUUUU 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?1750795358168521538?= X-GMAIL-MSGID: =?utf-8?q?1750795358168521538?= Use the generic kretprobe trampoline handler to add kretprobe support for LoongArch. Signed-off-by: Tiezhu Yang --- arch/loongarch/Kconfig | 1 + arch/loongarch/kernel/Makefile | 2 +- arch/loongarch/kernel/kprobes.c | 24 ++++++++ arch/loongarch/kernel/kprobes_trampoline.S | 96 ++++++++++++++++++++++++++++++ 4 files changed, 122 insertions(+), 1 deletion(-) create mode 100644 arch/loongarch/kernel/kprobes_trampoline.S diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 925d46d..e3eedfe 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -103,6 +103,7 @@ config LOONGARCH select HAVE_IRQ_EXIT_ON_IRQ_STACK select HAVE_IRQ_TIME_ACCOUNTING select HAVE_KPROBES + select HAVE_KRETPROBES select HAVE_MOD_ARCH_SPECIFIC select HAVE_NMI select HAVE_PCI diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile index a87b7f5..0172a3d 100644 --- a/arch/loongarch/kernel/Makefile +++ b/arch/loongarch/kernel/Makefile @@ -47,6 +47,6 @@ obj-$(CONFIG_UNWINDER_PROLOGUE) += unwind_prologue.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o -obj-$(CONFIG_KPROBES) += kprobes.o +obj-$(CONFIG_KPROBES) += kprobes.o kprobes_trampoline.o CPPFLAGS_vmlinux.lds := $(KBUILD_CFLAGS) diff --git a/arch/loongarch/kernel/kprobes.c b/arch/loongarch/kernel/kprobes.c index d01ecb2..541994c 100644 --- a/arch/loongarch/kernel/kprobes.c +++ b/arch/loongarch/kernel/kprobes.c @@ -320,6 +320,30 @@ int __init arch_populate_kprobe_blacklist(void) (unsigned long)__irqentry_text_end); } +/* Called from __kretprobe_trampoline */ +void __used *trampoline_probe_handler(struct pt_regs *regs) +{ + return (void *)kretprobe_trampoline_handler(regs, NULL); +} +NOKPROBE_SYMBOL(trampoline_probe_handler); + +void arch_prepare_kretprobe(struct kretprobe_instance *ri, + struct pt_regs *regs) +{ + ri->ret_addr = (kprobe_opcode_t *)regs->regs[1]; + ri->fp = NULL; + + /* Replace the return addr with trampoline addr */ + regs->regs[1] = (unsigned long)&__kretprobe_trampoline; +} +NOKPROBE_SYMBOL(arch_prepare_kretprobe); + +int arch_trampoline_kprobe(struct kprobe *p) +{ + return 0; +} +NOKPROBE_SYMBOL(arch_trampoline_kprobe); + int __init arch_init_kprobes(void) { return 0; diff --git a/arch/loongarch/kernel/kprobes_trampoline.S b/arch/loongarch/kernel/kprobes_trampoline.S new file mode 100644 index 0000000..af94b0d --- /dev/null +++ b/arch/loongarch/kernel/kprobes_trampoline.S @@ -0,0 +1,96 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +#include +#include + + .text + + .macro save_all_base_regs + cfi_st ra, PT_R1 + cfi_st tp, PT_R2 + cfi_st a0, PT_R4 + cfi_st a1, PT_R5 + cfi_st a2, PT_R6 + cfi_st a3, PT_R7 + cfi_st a4, PT_R8 + cfi_st a5, PT_R9 + cfi_st a6, PT_R10 + cfi_st a7, PT_R11 + cfi_st t0, PT_R12 + cfi_st t1, PT_R13 + cfi_st t2, PT_R14 + cfi_st t3, PT_R15 + cfi_st t4, PT_R16 + cfi_st t5, PT_R17 + cfi_st t6, PT_R18 + cfi_st t7, PT_R19 + cfi_st t8, PT_R20 + cfi_st u0, PT_R21 + cfi_st fp, PT_R22 + cfi_st s0, PT_R23 + cfi_st s1, PT_R24 + cfi_st s2, PT_R25 + cfi_st s3, PT_R26 + cfi_st s4, PT_R27 + cfi_st s5, PT_R28 + cfi_st s6, PT_R29 + cfi_st s7, PT_R30 + cfi_st s8, PT_R31 + csrrd t0, LOONGARCH_CSR_CRMD + andi t0, t0, 0x7 /* extract bit[1:0] PLV, bit[2] IE */ + LONG_S t0, sp, PT_CRMD + .endm + + .macro restore_all_base_regs + cfi_ld tp, PT_R2 + cfi_ld a0, PT_R4 + cfi_ld a1, PT_R5 + cfi_ld a2, PT_R6 + cfi_ld a3, PT_R7 + cfi_ld a4, PT_R8 + cfi_ld a5, PT_R9 + cfi_ld a6, PT_R10 + cfi_ld a7, PT_R11 + cfi_ld t0, PT_R12 + cfi_ld t1, PT_R13 + cfi_ld t2, PT_R14 + cfi_ld t3, PT_R15 + cfi_ld t4, PT_R16 + cfi_ld t5, PT_R17 + cfi_ld t6, PT_R18 + cfi_ld t7, PT_R19 + cfi_ld t8, PT_R20 + cfi_ld u0, PT_R21 + cfi_ld fp, PT_R22 + cfi_ld s0, PT_R23 + cfi_ld s1, PT_R24 + cfi_ld s2, PT_R25 + cfi_ld s3, PT_R26 + cfi_ld s4, PT_R27 + cfi_ld s5, PT_R28 + cfi_ld s6, PT_R29 + cfi_ld s7, PT_R30 + cfi_ld s8, PT_R31 + LONG_L t0, sp, PT_CRMD + li.d t1, 0x7 /* mask bit[1:0] PLV, bit[2] IE */ + csrxchg t0, t1, LOONGARCH_CSR_CRMD + .endm + +SYM_CODE_START(__kretprobe_trampoline) + addi.d sp, sp, -PT_SIZE + save_all_base_regs + + addi.d t0, sp, PT_SIZE + LONG_S t0, sp, PT_R3 + + move a0, sp /* pt_regs */ + + bl trampoline_probe_handler + + /* use the result as the return-address */ + move ra, a0 + + restore_all_base_regs + addi.d sp, sp, PT_SIZE + + jr ra +SYM_CODE_END(__kretprobe_trampoline) From patchwork Tue Nov 29 02:02:54 2022 Content-Type: text/plain; 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[2620:137:e000::1:20]) by mx.google.com with ESMTP id hz3-20020a1709072ce300b007ae10525573si12106004ejc.671.2022.11.28.18.20.22; Mon, 28 Nov 2022 18:21:26 -0800 (PST) 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 S235181AbiK2CDb (ORCPT + 99 others); Mon, 28 Nov 2022 21:03:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235123AbiK2CDM (ORCPT ); Mon, 28 Nov 2022 21:03:12 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 524F0BE04 for ; Mon, 28 Nov 2022 18:03:09 -0800 (PST) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8Bx3+tdaIVjSuIBAA--.4566S3; Tue, 29 Nov 2022 10:03:09 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8AxPuBUaIVjPdsdAA--.10463S6; Tue, 29 Nov 2022 10:03:07 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , WANG Xuerui , Masami Hiramatsu Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v5 4/4] samples/kprobes: Add LoongArch support Date: Tue, 29 Nov 2022 10:02:54 +0800 Message-Id: <1669687374-16432-5-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1669687374-16432-1-git-send-email-yangtiezhu@loongson.cn> References: <1669687374-16432-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf8AxPuBUaIVjPdsdAA--.10463S6 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjvJXoWrZw4rWrW5CF1fJw1xZFWDJwb_yoW8JF1fpF n0y3W5t3yFyw13WFW3Jayvgry0yryjkay8u3ykC34Yya429ry5AF1rKayjyw4kur90qF43 tr1FvryUGF1xZrJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b2xYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_JrI_Jryl8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l84 ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AKxVW8Jr0_Cr1U M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx1l5I8CrVACY4 xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5McIj6I8E87Iv67AKxVW8JVWx JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I 8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AK xVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcV AFwI0_Gr0_Xr1lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8I cIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r 4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxUcHUqUUUUU 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?1750795274625846554?= X-GMAIL-MSGID: =?utf-8?q?1750795274625846554?= Add LoongArch specific info in handler_pre() and handler_post(). Signed-off-by: Tiezhu Yang --- samples/kprobes/kprobe_example.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c index fd346f5..ef44c61 100644 --- a/samples/kprobes/kprobe_example.c +++ b/samples/kprobes/kprobe_example.c @@ -55,6 +55,10 @@ static int __kprobes handler_pre(struct kprobe *p, struct pt_regs *regs) pr_info("<%s> p->addr, 0x%p, ip = 0x%lx, flags = 0x%lx\n", p->symbol_name, p->addr, regs->psw.addr, regs->flags); #endif +#ifdef CONFIG_LOONGARCH + pr_info("<%s> p->addr = 0x%p, era = 0x%lx, estat = 0x%lx\n", + p->symbol_name, p->addr, regs->csr_era, regs->csr_estat); +#endif /* A dump_stack() here will give a stack backtrace */ return 0; @@ -92,6 +96,10 @@ static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs, pr_info("<%s> p->addr, 0x%p, flags = 0x%lx\n", p->symbol_name, p->addr, regs->flags); #endif +#ifdef CONFIG_LOONGARCH + pr_info("<%s> p->addr = 0x%p, estat = 0x%lx\n", + p->symbol_name, p->addr, regs->csr_estat); +#endif } static int __init kprobe_init(void)