From patchwork Fri Mar 7 20:10:38 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Long X-Patchwork-Id: 25909 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-qc0-f198.google.com (mail-qc0-f198.google.com [209.85.216.198]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id 5FA74203C3 for ; Fri, 7 Mar 2014 20:11:53 +0000 (UTC) Received: by mail-qc0-f198.google.com with SMTP id r5sf10923717qcx.9 for ; Fri, 07 Mar 2014 12:11:53 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:delivered-to:from:to:cc:subject :date:message-id:in-reply-to:references:x-original-sender :x-original-authentication-results:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-unsubscribe; bh=vwwUuJmTTjvk4mxsBscqjeJNu/RWhvswPpxT+0YGxG4=; b=hmveZAQrUQ10En4OWmA7e2V5UnpaZ+WOlN2asA3+ry59uyfNcV+9od8l/O8sqD+yze Q4LL60ktwWlLKWc8unpSN7c+nVEoSgj5yoXISlnfLCWxNTqUtuc52HqkWc3HeF+usCBw O7nLyNACzEpYhyjFT0bVJgSYGDwfqYjHNNW8pvX5ibwS20usg/UOpF8iMJUnDNzmU6a5 eExmoGBhzdEPtPyiWqPeoyyQOlw0AK6zKTwpvFWHinFgsy8nECAWD9qpVrxwFtrjILIj DpntaQbu+scW/+FjNBqiFJsoOeJFgOunLr/152d1bQ15AIpTB4Hyc8UTqAPBJwQWRVEo FTwA== X-Gm-Message-State: ALoCoQmhBKc5FMjigY0W9Il9c2xMcCrZTVFrhJtX+wON+eQhKiF+Fegm5UYSYb/nhFB2lRt35FRM X-Received: by 10.58.111.202 with SMTP id ik10mr6359535veb.4.1394223113057; Fri, 07 Mar 2014 12:11:53 -0800 (PST) MIME-Version: 1.0 X-BeenThere: patchwork-forward@linaro.org Received: by 10.140.44.101 with SMTP id f92ls1280296qga.61.gmail; Fri, 07 Mar 2014 12:11:52 -0800 (PST) X-Received: by 10.52.160.233 with SMTP id xn9mr1332145vdb.48.1394223112903; Fri, 07 Mar 2014 12:11:52 -0800 (PST) Received: from mail-vc0-f170.google.com (mail-vc0-f170.google.com [209.85.220.170]) by mx.google.com with ESMTPS id sr19si2420758vcb.71.2014.03.07.12.11.52 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 07 Mar 2014 12:11:52 -0800 (PST) Received-SPF: neutral (google.com: 209.85.220.170 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) client-ip=209.85.220.170; Received: by mail-vc0-f170.google.com with SMTP id hu8so4773992vcb.29 for ; Fri, 07 Mar 2014 12:11:52 -0800 (PST) X-Received: by 10.58.247.193 with SMTP id yg1mr1589467vec.41.1394223112813; Fri, 07 Mar 2014 12:11:52 -0800 (PST) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patches@linaro.org Received: by 10.220.78.9 with SMTP id i9csp139764vck; Fri, 7 Mar 2014 12:11:52 -0800 (PST) X-Received: by 10.68.231.169 with SMTP id th9mr23974091pbc.113.1394223111070; Fri, 07 Mar 2014 12:11:51 -0800 (PST) Received: from mail-pa0-f41.google.com (mail-pa0-f41.google.com [209.85.220.41]) by mx.google.com with ESMTPS id zo6si9374122pbc.223.2014.03.07.12.11.50 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 07 Mar 2014 12:11:51 -0800 (PST) Received-SPF: neutral (google.com: 209.85.220.41 is neither permitted nor denied by best guess record for domain of dave.long@linaro.org) client-ip=209.85.220.41; Received: by mail-pa0-f41.google.com with SMTP id fa1so4649878pad.28 for ; Fri, 07 Mar 2014 12:11:50 -0800 (PST) X-Received: by 10.66.150.69 with SMTP id ug5mr24150851pab.55.1394223110564; Fri, 07 Mar 2014 12:11:50 -0800 (PST) Received: from localhost.localdomain (n182z4l226.static.ctm.net. [182.93.4.226]) by mx.google.com with ESMTPSA id tu3sm12419427pab.1.2014.03.07.12.11.45 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 07 Mar 2014 12:11:49 -0800 (PST) From: David Long To: linux-arm-kernel@lists.infradead.org, Russell King Cc: Rabin Vincent , "Jon Medhurst (Tixy)" , Oleg Nesterov , Srikar Dronamraju , Ingo Molnar , Masami Hiramatsu , Ananth N Mavinakayanahalli , Anil S Keshavamurthy , , Peter Zijlstra , Paul Mackerras , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org Subject: [PATCH v7 13/15] ARM: Add an emulate flag to the kprobes/uprobes instruction decode functions Date: Fri, 7 Mar 2014 15:10:38 -0500 Message-Id: <1394223040-17129-14-git-send-email-dave.long@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1394223040-17129-1-git-send-email-dave.long@linaro.org> References: <1394223040-17129-1-git-send-email-dave.long@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: dave.long@linaro.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.220.170 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , 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 468d4a9..8795f9f 100644 --- a/arch/arm/kernel/kprobes.c +++ b/arch/arm/kernel/kprobes.c @@ -89,7 +89,7 @@ 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 738e5fc..8e7fde8 100644 --- a/arch/arm/kernel/probes-arm.c +++ b/arch/arm/kernel/probes-arm.c @@ -725,10 +725,10 @@ 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 eab440f..23e2cbd 100644 --- a/arch/arm/kernel/probes-thumb.c +++ b/arch/arm/kernel/probes-thumb.c @@ -863,20 +863,20 @@ 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 d6f67c1d..65e4250 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 b6d9b85..f9dff12 100644 --- a/arch/arm/kernel/probes.c +++ b/arch/arm/kernel/probes.c @@ -257,7 +257,7 @@ 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 */ @@ -323,7 +323,9 @@ static bool __kprobes decode_regs(probes_opcode_t *pinsn, u32 regs) insn |= new_bits & mask; } - *pinsn = insn; + if (modify) + *pinsn = insn; + return true; reject: @@ -385,13 +387,14 @@ 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; @@ -406,7 +409,7 @@ 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) { @@ -430,6 +433,11 @@ 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 0c72e54..33cc30c 100644 --- a/arch/arm/kernel/probes.h +++ b/arch/arm/kernel/probes.h @@ -401,7 +401,7 @@ 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