From patchwork Sat Dec 27 07:35:47 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 5544371 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 [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id CB01FBEEA8 for ; Sat, 27 Dec 2014 07:45:44 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CED192016C for ; Sat, 27 Dec 2014 07:45:43 +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 D1DDB20155 for ; Sat, 27 Dec 2014 07:45:42 +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 1Y4m1e-0006ER-9r; Sat, 27 Dec 2014 07:43:02 +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 1Y4lzo-0004lQ-PP for linux-arm-kernel@lists.infradead.org; Sat, 27 Dec 2014 07:41:10 +0000 Received: from 172.24.2.119 (EHLO lggeml421-hub.china.huawei.com) ([172.24.2.119]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CGQ75634; Sat, 27 Dec 2014 15:40:25 +0800 (CST) Received: from kernel-host.huawei (10.107.197.247) by lggeml421-hub.china.huawei.com (10.72.61.31) with Microsoft SMTP Server id 14.3.158.1; Sat, 27 Dec 2014 15:40:17 +0800 From: Wang Nan To: , , Subject: [PATCH v17 09/11] ARM: kprobes: Fix unreliable MRS instruction tests Date: Sat, 27 Dec 2014 15:35:47 +0800 Message-ID: <1419665747-13240-1-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1419665637-12744-1-git-send-email-wangnan0@huawei.com> References: <1419665637-12744-1-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-20141226_234109_380994_97548091 X-CRM114-Status: GOOD ( 15.27 ) X-Spam-Score: -0.7 (/) Cc: lizefan@huawei.com, 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 From: "Jon Medhurst (Tixy)" For the instruction 'mrs Rn, cpsr' the resulting value of Rn can vary due to external factors we can't control. So get the test code to mask out these indeterminate bits. Signed-off-by: Jon Medhurst --- arch/arm/probes/kprobes/test-arm.c | 6 +++--- arch/arm/probes/kprobes/test-core.c | 19 ++++++++++--------- arch/arm/probes/kprobes/test-core.h | 33 ++++++++++++++++++++++++++++----- arch/arm/probes/kprobes/test-thumb.c | 4 ++-- 4 files changed, 43 insertions(+), 19 deletions(-) diff --git a/arch/arm/probes/kprobes/test-arm.c b/arch/arm/probes/kprobes/test-arm.c index 9b3b1b4..e72b07e 100644 --- a/arch/arm/probes/kprobes/test-arm.c +++ b/arch/arm/probes/kprobes/test-arm.c @@ -204,9 +204,9 @@ void kprobe_arm_test_cases(void) #endif TEST_GROUP("Miscellaneous instructions") - TEST("mrs r0, cpsr") - TEST("mrspl r7, cpsr") - TEST("mrs r14, cpsr") + TEST_RMASKED("mrs r",0,~PSR_IGNORE_BITS,", cpsr") + TEST_RMASKED("mrspl r",7,~PSR_IGNORE_BITS,", cpsr") + TEST_RMASKED("mrs r",14,~PSR_IGNORE_BITS,", cpsr") TEST_UNSUPPORTED(__inst_arm(0xe10ff000) " @ mrs r15, cpsr") TEST_UNSUPPORTED("mrs r0, spsr") TEST_UNSUPPORTED("mrs lr, spsr") diff --git a/arch/arm/probes/kprobes/test-core.c b/arch/arm/probes/kprobes/test-core.c index 7c5ddd5..e495127 100644 --- a/arch/arm/probes/kprobes/test-core.c +++ b/arch/arm/probes/kprobes/test-core.c @@ -1056,15 +1056,6 @@ static int test_case_run_count; static bool test_case_is_thumb; static int test_instance; -/* - * We ignore the state of the imprecise abort disable flag (CPSR.A) because this - * can change randomly as the kernel doesn't take care to preserve or initialise - * this across context switches. Also, with Security Extentions, the flag may - * not be under control of the kernel; for this reason we ignore the state of - * the FIQ disable flag CPSR.F as well. - */ -#define PSR_IGNORE_BITS (PSR_A_BIT | PSR_F_BIT) - static unsigned long test_check_cc(int cc, unsigned long cpsr) { int ret = arm_check_condition(cc << 28, cpsr); @@ -1271,11 +1262,21 @@ test_case_pre_handler(struct kprobe *p, struct pt_regs *regs) static int __kprobes test_after_pre_handler(struct kprobe *p, struct pt_regs *regs) { + struct test_arg *args; + if (container_of(p, struct test_probe, kprobe)->hit == test_instance) return 0; /* Already run for this test instance */ result_regs = *regs; + + /* Mask out results which are indeterminate */ result_regs.ARM_cpsr &= ~PSR_IGNORE_BITS; + for (args = current_args; args[0].type != ARG_TYPE_END; ++args) + if (args[0].type == ARG_TYPE_REG_MASKED) { + struct test_arg_regptr *arg = + (struct test_arg_regptr *)args; + result_regs.uregs[arg->reg] &= arg->val; + } /* Undo any changes done to SP by the test case */ regs->ARM_sp = (unsigned long)current_stack; diff --git a/arch/arm/probes/kprobes/test-core.h b/arch/arm/probes/kprobes/test-core.h index 9991754..9428520 100644 --- a/arch/arm/probes/kprobes/test-core.h +++ b/arch/arm/probes/kprobes/test-core.h @@ -45,10 +45,11 @@ extern int kprobe_test_cc_position; * */ -#define ARG_TYPE_END 0 -#define ARG_TYPE_REG 1 -#define ARG_TYPE_PTR 2 -#define ARG_TYPE_MEM 3 +#define ARG_TYPE_END 0 +#define ARG_TYPE_REG 1 +#define ARG_TYPE_PTR 2 +#define ARG_TYPE_MEM 3 +#define ARG_TYPE_REG_MASKED 4 #define ARG_FLAG_UNSUPPORTED 0x01 #define ARG_FLAG_SUPPORTED 0x02 @@ -61,7 +62,7 @@ struct test_arg { }; struct test_arg_regptr { - u8 type; /* ARG_TYPE_REG or ARG_TYPE_PTR */ + u8 type; /* ARG_TYPE_REG or ARG_TYPE_PTR or ARG_TYPE_REG_MASKED */ u8 reg; u8 _padding[2]; u32 val; @@ -138,6 +139,12 @@ struct test_arg_end { ".short 0 \n\t" \ ".word "#val" \n\t" +#define TEST_ARG_REG_MASKED(reg, val) \ + ".byte "__stringify(ARG_TYPE_REG_MASKED)" \n\t" \ + ".byte "#reg" \n\t" \ + ".short 0 \n\t" \ + ".word "#val" \n\t" + #define TEST_ARG_END(flags) \ ".byte "__stringify(ARG_TYPE_END)" \n\t" \ ".byte "TEST_ISA flags" \n\t" \ @@ -395,6 +402,22 @@ struct test_arg_end { " "codex" \n\t" \ TESTCASE_END +#define TEST_RMASKED(code1, reg, mask, code2) \ + TESTCASE_START(code1 #reg code2) \ + TEST_ARG_REG_MASKED(reg, mask) \ + TEST_ARG_END("") \ + TEST_INSTRUCTION(code1 #reg code2) \ + TESTCASE_END + +/* + * We ignore the state of the imprecise abort disable flag (CPSR.A) because this + * can change randomly as the kernel doesn't take care to preserve or initialise + * this across context switches. Also, with Security Extensions, the flag may + * not be under control of the kernel; for this reason we ignore the state of + * the FIQ disable flag CPSR.F as well. + */ +#define PSR_IGNORE_BITS (PSR_A_BIT | PSR_F_BIT) + /* * Macros for defining space directives spread over multiple lines. diff --git a/arch/arm/probes/kprobes/test-thumb.c b/arch/arm/probes/kprobes/test-thumb.c index e8cf193..b683b45 100644 --- a/arch/arm/probes/kprobes/test-thumb.c +++ b/arch/arm/probes/kprobes/test-thumb.c @@ -778,8 +778,8 @@ CONDITION_INSTRUCTIONS(22, TEST_UNSUPPORTED("subs pc, lr, #4") - TEST("mrs r0, cpsr") - TEST("mrs r14, cpsr") + TEST_RMASKED("mrs r",0,~PSR_IGNORE_BITS,", cpsr") + TEST_RMASKED("mrs r",14,~PSR_IGNORE_BITS,", cpsr") TEST_UNSUPPORTED(__inst_thumb32(0xf3ef8d00) " @ mrs sp, spsr") TEST_UNSUPPORTED(__inst_thumb32(0xf3ef8f00) " @ mrs pc, spsr") TEST_UNSUPPORTED("mrs r0, spsr")