Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752211AbbBMFtK (ORCPT ); Fri, 13 Feb 2015 00:49:10 -0500 Received: from szxga03-in.huawei.com ([119.145.14.66]:23178 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752115AbbBMFtH (ORCPT ); Fri, 13 Feb 2015 00:49:07 -0500 From: Wang Nan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , Subject: [RFC PATCH v3 14/26] early kprobes: ARM: introduce early kprobes related code area. Date: Fri, 13 Feb 2015 13:40:51 +0800 Message-ID: <1423806051-62072-1-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1423805941-61407-1-git-send-email-wangnan0@huawei.com> References: <1423805941-61407-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.197.247] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.54DD8FFD.0050,ss=1,re=0.001,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 00b7c3020f87c05110220a993af68b97 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2627 Lines: 92 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) -- 1.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/