From patchwork Mon Feb 10 07:39:03 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Long X-Patchwork-Id: 3616311 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 0D2929F382 for ; Mon, 10 Feb 2014 08:10:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EE6F020176 for ; Mon, 10 Feb 2014 08:10:08 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (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 D34BA2016C for ; Mon, 10 Feb 2014 08:10:07 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WClVr-0001Mn-35; Mon, 10 Feb 2014 07:42:44 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WClUz-0001cW-V6; Mon, 10 Feb 2014 07:41:49 +0000 Received: from mail-qa0-f47.google.com ([209.85.216.47]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WClTD-0001Pw-PG for linux-arm-kernel@lists.infradead.org; Mon, 10 Feb 2014 07:40:46 +0000 Received: by mail-qa0-f47.google.com with SMTP id j5so9078297qaq.34 for ; Sun, 09 Feb 2014 23:39:39 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=r4zHk9wJsg5dbTlgNSNaSttDRO+oA8LaOZZbZWTb5Zs=; b=W1UasWUAzl/JNV2M5XIU6bLZK0S+oeRReiXisxVKsmWxTpddehN/454zQR8N5ofcub KpRhV858Z7V4ewmsXVSnKkU9HOESoKn4G1wLX1qrBc8xtzuQtsMQfIexvhkCNgmprEts UWioQbdavT1NDzs/nZ0ElC3Lu0aouiKQWdcELgKP8MXedzpCFG+XwkrrnAypn0v72M9n esg1J92KRa7+iji+MgxcjRbkBHkZtuzFZ2vbyiAwkRWbgC/yywsTL/8CcXm14YMja3Gp LeGNfj+32aWh6V704aXV1oeER9IRt2zo5UAHaQFERDryjALwjJhb3Bu5CbDmCF8xBWQL ROWQ== X-Gm-Message-State: ALoCoQleTxCAxo662RrCAGTnRKLHz61E9/ZoOJL9ubSPnHEfCGjGg8oBapZGZH0cc/mBO4m6T+kb X-Received: by 10.224.121.137 with SMTP id h9mr45321959qar.55.1392017979485; Sun, 09 Feb 2014 23:39:39 -0800 (PST) Received: from localhost.localdomain (pool-72-71-243-183.cncdnh.fast00.myfairpoint.net. [72.71.243.183]) by mx.google.com with ESMTPSA id k107sm22671621qgk.5.2014.02.09.23.39.36 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 09 Feb 2014 23:39:37 -0800 (PST) From: David Long To: linux-arm-kernel@lists.infradead.org, Russell King Subject: [PATCH v6 12/14] ARM: Add an emulate flag to the kprobes/uprobes instruction decode functions Date: Mon, 10 Feb 2014 02:39:03 -0500 Message-Id: <1392017945-4507-13-git-send-email-dave.long@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1392017945-4507-1-git-send-email-dave.long@linaro.org> References: <1392017945-4507-1-git-send-email-dave.long@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140210_023959_998987_B0090D62 X-CRM114-Status: GOOD ( 13.90 ) X-Spam-Score: 0.4 (/) Cc: "Jon Medhurst \(Tixy\)" , Peter Zijlstra , Srikar Dronamraju , Oleg Nesterov , Anil S Keshavamurthy , linux-kernel@vger.kernel.org, Rabin Vincent , Ingo Molnar , Paul Mackerras , Arnaldo Carvalho de Melo , Masami Hiramatsu , davem@davemloft.net, Ananth N Mavinakayanahalli X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,KHOP_BIG_TO_CC, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=no 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 From: "David A. Long" Add an emulate flag into the instruction interpreter, primarily for uprobes support. Signed-off-by: David A. Long Acked-by: Jon Medhurst --- arch/arm/kernel/kprobes.c | 2 +- arch/arm/kernel/kprobes.h | 1 + arch/arm/kernel/probes-arm.c | 4 ++-- arch/arm/kernel/probes-arm.h | 2 +- arch/arm/kernel/probes-thumb.c | 8 ++++---- arch/arm/kernel/probes-thumb.h | 4 ++-- arch/arm/kernel/probes.c | 18 +++++++++++++----- arch/arm/kernel/probes.h | 2 +- 8 files changed, 25 insertions(+), 16 deletions(-) diff --git a/arch/arm/kernel/kprobes.c b/arch/arm/kernel/kprobes.c index db040ad..9421c0d 100644 --- a/arch/arm/kernel/kprobes.c +++ b/arch/arm/kernel/kprobes.c @@ -87,7 +87,7 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) p->opcode = insn; p->ainsn.insn = tmp_insn; - switch ((*decode_insn)(insn, &p->ainsn, actions)) { + switch ((*decode_insn)(insn, &p->ainsn, true, actions)) { case INSN_REJECTED: /* not supported */ return -EINVAL; diff --git a/arch/arm/kernel/kprobes.h b/arch/arm/kernel/kprobes.h index eee8089..d0a24b7 100644 --- a/arch/arm/kernel/kprobes.h +++ b/arch/arm/kernel/kprobes.h @@ -35,6 +35,7 @@ kprobe_decode_ldmstm(kprobe_opcode_t insn, struct arch_specific_insn *asi, typedef enum probes_insn (kprobe_decode_insn_t)(probes_opcode_t, struct arch_specific_insn *, + bool, const union decode_action *); #ifdef CONFIG_THUMB2_KERNEL diff --git a/arch/arm/kernel/probes-arm.c b/arch/arm/kernel/probes-arm.c index 0faa4b2..a4f6914 100644 --- a/arch/arm/kernel/probes-arm.c +++ b/arch/arm/kernel/probes-arm.c @@ -723,10 +723,10 @@ static void __kprobes arm_singlestep(probes_opcode_t insn, */ enum probes_insn __kprobes arm_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, - const union decode_action *actions) + bool emulate, const union decode_action *actions) { asi->insn_singlestep = arm_singlestep; asi->insn_check_cc = probes_condition_checks[insn>>28]; return probes_decode_insn(insn, asi, probes_decode_arm_table, false, - actions); + emulate, actions); } diff --git a/arch/arm/kernel/probes-arm.h b/arch/arm/kernel/probes-arm.h index 7a5cce4..ea614dc 100644 --- a/arch/arm/kernel/probes-arm.h +++ b/arch/arm/kernel/probes-arm.h @@ -67,7 +67,7 @@ void __kprobes simulate_mov_ipsp(probes_opcode_t opcode, extern const union decode_item probes_decode_arm_table[]; enum probes_insn arm_probes_decode_insn(probes_opcode_t, - struct arch_specific_insn *, + struct arch_specific_insn *, bool emulate, const union decode_action *actions); #endif diff --git a/arch/arm/kernel/probes-thumb.c b/arch/arm/kernel/probes-thumb.c index 69d4de5..1a3ddf8 100644 --- a/arch/arm/kernel/probes-thumb.c +++ b/arch/arm/kernel/probes-thumb.c @@ -862,20 +862,20 @@ static void __kprobes thumb32_singlestep(probes_opcode_t opcode, enum probes_insn __kprobes thumb16_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, - const union decode_action *actions) + bool emulate, const union decode_action *actions) { asi->insn_singlestep = thumb16_singlestep; asi->insn_check_cc = thumb_check_cc; return probes_decode_insn(insn, asi, probes_decode_thumb16_table, true, - actions); + emulate, actions); } enum probes_insn __kprobes thumb32_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, - const union decode_action *actions) + bool emulate, const union decode_action *actions) { asi->insn_singlestep = thumb32_singlestep; asi->insn_check_cc = thumb_check_cc; return probes_decode_insn(insn, asi, probes_decode_thumb32_table, true, - actions); + emulate, actions); } diff --git a/arch/arm/kernel/probes-thumb.h b/arch/arm/kernel/probes-thumb.h index b26411e..dd95866 100644 --- a/arch/arm/kernel/probes-thumb.h +++ b/arch/arm/kernel/probes-thumb.h @@ -89,9 +89,9 @@ extern const union decode_item probes_decode_thumb16_table[]; enum probes_insn __kprobes thumb16_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, - const union decode_action *actions); + bool emulate, const union decode_action *actions); enum probes_insn __kprobes thumb32_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, - const union decode_action *actions); + bool emulate, const union decode_action *actions); #endif diff --git a/arch/arm/kernel/probes.c b/arch/arm/kernel/probes.c index 865d4b7..8a4088f 100644 --- a/arch/arm/kernel/probes.c +++ b/arch/arm/kernel/probes.c @@ -253,7 +253,7 @@ set_emulated_insn(probes_opcode_t insn, struct arch_specific_insn *asi, * non-zero value, the corresponding nibble in pinsn is validated and modified * according to the type. */ -static bool __kprobes decode_regs(probes_opcode_t *pinsn, u32 regs) +static bool __kprobes decode_regs(probes_opcode_t *pinsn, u32 regs, bool modify) { probes_opcode_t insn = *pinsn; probes_opcode_t mask = 0xf; /* Start at least significant nibble */ @@ -319,7 +319,9 @@ static bool __kprobes decode_regs(probes_opcode_t *pinsn, u32 regs) insn |= new_bits & mask; } - *pinsn = insn; + if (modify) + *pinsn = insn; + return true; reject: @@ -381,13 +383,14 @@ static const int decode_struct_sizes[NUM_DECODE_TYPES] = { int __kprobes probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, const union decode_item *table, bool thumb, - const union decode_action *actions) + bool emulate, const union decode_action *actions) { const struct decode_header *h = (struct decode_header *)table; const struct decode_header *next; bool matched = false; - insn = prepare_emulated_insn(insn, asi, thumb); + if (emulate) + insn = prepare_emulated_insn(insn, asi, thumb); for (;; h = next) { enum decode_type type = h->type_regs.bits & DECODE_TYPE_MASK; @@ -402,7 +405,7 @@ probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, if (!matched && (insn & h->mask.bits) != h->value.bits) continue; - if (!decode_regs(&insn, regs)) + if (!decode_regs(&insn, regs, emulate)) return INSN_REJECTED; switch (type) { @@ -426,6 +429,11 @@ probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, case DECODE_TYPE_EMULATE: { struct decode_emulate *d = (struct decode_emulate *)h; + + if (!emulate) + return actions[d->handler.action].decoder(insn, + asi, h); + asi->insn_handler = actions[d->handler.action].handler; set_emulated_insn(insn, asi, thumb); return INSN_GOOD; diff --git a/arch/arm/kernel/probes.h b/arch/arm/kernel/probes.h index e296ff1..321d15f 100644 --- a/arch/arm/kernel/probes.h +++ b/arch/arm/kernel/probes.h @@ -399,7 +399,7 @@ probes_insn_handler_t probes_emulate_none; int __kprobes probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, - const union decode_item *table, bool thumb, + const union decode_item *table, bool thumb, bool emulate, const union decode_action *actions); #endif