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 X-Spam-Level: X-Spam-Status: No, score=-9.3 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50C62C4724C for ; Fri, 1 May 2020 04:20:04 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E07F820836 for ; Fri, 1 May 2020 04:20:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="bUEPmuQq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E07F820836 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 49CzYY0r66zDqSQ for ; Fri, 1 May 2020 14:20:01 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::1044; helo=mail-pj1-x1044.google.com; envelope-from=jniethe5@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=bUEPmuQq; dkim-atps=neutral Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 49CyrT6s61zDrL4 for ; Fri, 1 May 2020 13:47:53 +1000 (AEST) Received: by mail-pj1-x1044.google.com with SMTP id a32so1859702pje.5 for ; Thu, 30 Apr 2020 20:47:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=GglahPuDIDNYvnqv+Ien9geCHOYyIVjEW6vAFBrV9jY=; b=bUEPmuQq8T1HOI0+RbTmWnwDqS4QV5ds2827hhYXSEXIA9jBMIT3gMXTXXdJk+QnmZ luLzcH/WWidvD1aB3eOAhj66s2vR9jQk4tq9k1OY6gaLRk9frH7wrQU4EH/B4JRA8GfD XsQD97Ag4YfdfkaedGU8ODtxfGKq6TC1SIiWVanjW0/8KN16orJwohwnqVoj3YZc0Uj3 MOZZKIaNMZvall+CktaHkNNO3O1JjCbLhr63sPDGDhN6qE1dY/Ps4gIxNwWLodFgeiAa vwudxc+ODNmwgSSOqbhyVhYhfeW+Fgw5ptHZbyxgSMjfKT3EAcUWutPhSUO+ZUBdm2W7 7p3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=GglahPuDIDNYvnqv+Ien9geCHOYyIVjEW6vAFBrV9jY=; b=ETHtkJRWMPUzJPSl0YGHU1SMIVtrMci/Mwx+1GzejppEUQA/l4p7H7mxbqaHHJuabq hhFawzF6Mkh5AwCiiswWZEt/NPlkJuWaNnpN3BRstUHZthWqv/m+rPjR3x25FbOxZEmN Z+jk5uECMrGKFEDn0dCwt16Lar07QgaRnXWCU8Gi6HetjJE4Bt0yKTZ1c6MNMA3nB6PA 2P20uNXEy04R8xb98+vbM83ALlUivJxH4/dYSpeD7p5SBPJHvWGemHKO3Gztabuh6tZj 6aymocJv3ULsMJp8ImSEsIy6iz5ok1DfTOpSILRnR3caTy/Z4gwSr3KhvFn3cOcR5EtA XoQw== X-Gm-Message-State: AGi0PuZe524ZoD496rcru1pJMNLn5e4NTavGW+TFkKSBc/3nBlkztIcE nXz3GFVGE9KGdTHHKIAT49b4jy78tNS9xg== X-Google-Smtp-Source: APiQypKyE4MPz/T6Q262rI/7Z0t6VnfwLWFQyOc7L/kO+O9/1Tok6iqjQPUGq5BRRURlzNeGwaf1tA== X-Received: by 2002:a17:902:d203:: with SMTP id t3mr2425012ply.136.1588304871499; Thu, 30 Apr 2020 20:47:51 -0700 (PDT) Received: from localhost.localdomain (180-150-65-4.b49641.syd.nbn.aussiebb.net. [180.150.65.4]) by smtp.gmail.com with ESMTPSA id w28sm940082pgc.26.2020.04.30.20.47.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2020 20:47:51 -0700 (PDT) From: Jordan Niethe To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v7 17/28] powerpc: Introduce a function for reporting instruction length Date: Fri, 1 May 2020 13:42:09 +1000 Message-Id: <20200501034220.8982-18-jniethe5@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200501034220.8982-1-jniethe5@gmail.com> References: <20200501034220.8982-1-jniethe5@gmail.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alistair@popple.id.au, npiggin@gmail.com, bala24@linux.ibm.com, naveen.n.rao@linux.vnet.ibm.com, Jordan Niethe , dja@axtens.net Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Currently all instructions have the same length, but in preparation for prefixed instructions introduce a function for returning instruction length. Signed-off-by: Jordan Niethe --- v6: - feature-fixups.c: do_final_fixups(): use here - ppc_inst_len(): change return type from bool to int - uprobes: Use ppc_inst_read() before calling ppc_inst_len() --- arch/powerpc/include/asm/inst.h | 5 +++++ arch/powerpc/kernel/kprobes.c | 6 ++++-- arch/powerpc/kernel/uprobes.c | 2 +- arch/powerpc/lib/feature-fixups.c | 14 +++++++------- 4 files changed, 17 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h index 0d581b332c20..2f3c9d5bcf7c 100644 --- a/arch/powerpc/include/asm/inst.h +++ b/arch/powerpc/include/asm/inst.h @@ -17,6 +17,11 @@ static inline u32 ppc_inst_val(struct ppc_inst x) return x.val; } +static inline int ppc_inst_len(struct ppc_inst x) +{ + return sizeof(struct ppc_inst); +} + static inline int ppc_inst_primary_opcode(struct ppc_inst x) { return ppc_inst_val(x) >> 26; diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index a72c8e1a42ad..33d54b091c70 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -462,14 +462,16 @@ NOKPROBE_SYMBOL(trampoline_probe_handler); */ int kprobe_post_handler(struct pt_regs *regs) { + int len; struct kprobe *cur = kprobe_running(); struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); if (!cur || user_mode(regs)) return 0; + len = ppc_inst_len(ppc_inst_read((struct ppc_inst *)cur->ainsn.insn)); /* make sure we got here for instruction we have a kprobe on */ - if (((unsigned long)cur->ainsn.insn + 4) != regs->nip) + if (((unsigned long)cur->ainsn.insn + len) != regs->nip) return 0; if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) { @@ -478,7 +480,7 @@ int kprobe_post_handler(struct pt_regs *regs) } /* Adjust nip to after the single-stepped instruction */ - regs->nip = (unsigned long)cur->addr + 4; + regs->nip = (unsigned long)cur->addr + len; regs->msr |= kcb->kprobe_saved_msr; /*Restore back the original saved kprobes variables and continue. */ diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c index 6893d40a48c5..83e883e1a42d 100644 --- a/arch/powerpc/kernel/uprobes.c +++ b/arch/powerpc/kernel/uprobes.c @@ -112,7 +112,7 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) * support doesn't exist and have to fix-up the next instruction * to be executed. */ - regs->nip = utask->vaddr + MAX_UINSN_BYTES; + regs->nip = utask->vaddr + ppc_inst_len(ppc_inst_read(&auprobe->insn)); user_disable_single_step(current); return 0; diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c index 13ec3264a565..f4845e740338 100644 --- a/arch/powerpc/lib/feature-fixups.c +++ b/arch/powerpc/lib/feature-fixups.c @@ -390,20 +390,20 @@ void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end) static void do_final_fixups(void) { #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE) - struct ppc_inst *src, *dest; - unsigned long length; + struct ppc_inst inst, *src, *dest, *end; if (PHYSICAL_START == 0) return; src = (struct ppc_inst *)(KERNELBASE + PHYSICAL_START); dest = (struct ppc_inst *)KERNELBASE; - length = (__end_interrupts - _stext) / sizeof(struct ppc_inst); + end = (void *)src + (__end_interrupts - _stext); - while (length--) { - raw_patch_instruction(dest, ppc_inst_read(src)); - src++; - dest++; + while (src < end) { + inst = ppc_inst_read(src); + raw_patch_instruction(dest, inst); + src = (void *)src + ppc_inst_len(inst); + dest = (void *)dest + ppc_inst_len(inst); } #endif } -- 2.17.1