From patchwork Thu Feb 12 12:20:35 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 5819521 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 7A8A9BF440 for ; Thu, 12 Feb 2015 12:52:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AABB820109 for ; Thu, 12 Feb 2015 12:52:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BF7E820103 for ; Thu, 12 Feb 2015 12:52:24 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YLtCv-0006Ce-Sk; Thu, 12 Feb 2015 12:49:25 +0000 Received: from szxga01-in.huawei.com ([119.145.14.64]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YLswO-0004Cn-Gk for linux-arm-kernel@lists.infradead.org; Thu, 12 Feb 2015 12:32:21 +0000 Received: from 172.24.2.119 (EHLO lggeml423-hub.china.huawei.com) ([172.24.2.119]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CJL31447; Thu, 12 Feb 2015 20:27:22 +0800 (CST) Received: from kernel-host.huawei (10.107.197.247) by lggeml423-hub.china.huawei.com (10.72.61.33) with Microsoft SMTP Server id 14.3.158.1; Thu, 12 Feb 2015 20:27:15 +0800 From: Wang Nan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH v2 14/26] early kprobes: ARM: introduce early kprobes related code area. Date: Thu, 12 Feb 2015 20:20:35 +0800 Message-ID: <1423743635-12629-1-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1423743476-11927-1-git-send-email-wangnan0@huawei.com> References: <1423743476-11927-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.107.197.247] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150212_043220_941216_0E771A59 X-CRM114-Status: UNSURE ( 8.52 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.7 (/) Cc: lizefan@huawei.com, x86@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In arm's vmlinux.lds, introduces code area inside text section. Executable area used by early kprobes will be allocated from there. Signed-off-by: Wang Nan --- arch/arm/include/asm/kprobes.h | 31 +++++++++++++++++++++++++++++-- arch/arm/kernel/vmlinux.lds.S | 2 ++ 2 files changed, 31 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/kprobes.h b/arch/arm/include/asm/kprobes.h index 3ea9be5..0a4421e 100644 --- a/arch/arm/include/asm/kprobes.h +++ b/arch/arm/include/asm/kprobes.h @@ -17,16 +17,42 @@ #define _ARM_KPROBES_H #include -#include -#include #define __ARCH_WANT_KPROBES_INSN_SLOT #define MAX_INSN_SIZE 2 +#ifdef __ASSEMBLY__ + +#define KPROBE_OPCODE_SIZE 4 +#define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry) + +#ifdef CONFIG_EARLY_KPROBES +#define EARLY_KPROBES_CODES_AREA \ + . = ALIGN(8); \ + VMLINUX_SYMBOL(__early_kprobes_start) = .; \ + VMLINUX_SYMBOL(__early_kprobes_code_area_start) = .; \ + . = . + MAX_OPTINSN_SIZE * CONFIG_NR_EARLY_KPROBES_SLOTS; \ + VMLINUX_SYMBOL(__early_kprobes_code_area_end) = .; \ + . = ALIGN(8); \ + VMLINUX_SYMBOL(__early_kprobes_insn_slot_start) = .; \ + . = . + MAX_INSN_SIZE * KPROBE_OPCODE_SIZE * CONFIG_NR_EARLY_KPROBES_SLOTS;\ + VMLINUX_SYMBOL(__early_kprobes_insn_slot_end) = .; \ + VMLINUX_SYMBOL(__early_kprobes_end) = .; + +#else +#define EARLY_KPROBES_CODES_AREA +#endif + +#else + +#include +#include + #define flush_insn_slot(p) do { } while (0) #define kretprobe_blacklist_size 0 typedef u32 kprobe_opcode_t; +#define KPROBE_OPCODE_SIZE sizeof(kprobe_opcode_t) struct kprobe; #include @@ -83,4 +109,5 @@ struct arch_optimized_insn { */ }; +#endif /* __ASSEMBLY__ */ #endif /* _ARM_KPROBES_H */ diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index 9351f7f..6fa2b85 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -11,6 +11,7 @@ #ifdef CONFIG_ARM_KERNMEM_PERMS #include #endif +#include #define PROC_INFO \ . = ALIGN(4); \ @@ -108,6 +109,7 @@ SECTIONS SCHED_TEXT LOCK_TEXT KPROBES_TEXT + EARLY_KPROBES_CODES_AREA IDMAP_TEXT #ifdef CONFIG_MMU *(.fixup)