From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C413C433EF for ; Thu, 21 Jul 2022 05:57:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231191AbiGUF5r (ORCPT ); Thu, 21 Jul 2022 01:57:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46438 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230499AbiGUF5m (ORCPT ); Thu, 21 Jul 2022 01:57:42 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1955E79ECE for ; Wed, 20 Jul 2022 22:57:40 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id v1-20020a259d81000000b0066ec7dff8feso570172ybp.18 for ; Wed, 20 Jul 2022 22:57:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=hybHHJpNkr5qvVF2psrpE5ezfSg01aH1BSluCT+EV4I=; b=Gy3GT+AejE5lIqh2FM7HDqKdxCV2+m38IsmUpjEKK1QJmEoelcLR1wNLUpjwR0PQkT B/On8ku5ir8YgBuuIXV0lnVfrOyHsaNGO/oL7BybSdER3FWejp7+Df8wxKW/R20ChgQO 0tgF+VaCWq69D/tqUhWzHS7NsjR7+BjUQboxtxC/mIamoEzuietAqDCS5WNaPh0NI1a7 mrsgfg+J61pDYkEnH16ghZeVk38xPbU9JFqu4U396jprd1MwcgriPzJJOiokg7xUfE+x Rz6bdZ0FG+eKIe2YdXgj6+0uRXCSoNKy9bpzXtHHvJX1XzmnGuI3NqMkai5ZBhjlyTO5 9Dfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=hybHHJpNkr5qvVF2psrpE5ezfSg01aH1BSluCT+EV4I=; b=gBWX4+5gRcQnhvP640vIcoeUnQwuAJ7qFPAfK8+AXpuL+yalYRX3T6taAjGyjH8kIe vvz0sDtczbAU2HNj+oiQt6ZVOU0F68se22nt9tkZb+U56tVyIs9jy3KvE3OXuPwQ70y1 vqKe1hqsZR/bvCqUoOyE/6u87iWKFx+NcE4FaKzxca9ih71uzMzjOxSYQaveAr86vCsd CmImWXGWhcl8i/MaT5FNs/S3g20Ve+UCKOT98NaugIwZXjh5CabcpTQJA7mwmEJBxgwP g3yG6dzNh5kHLiDLuI+b1rPs1rAUi6gpl4+KBbj93iGrkIS80IzapBWVvR4UamYm1xci axUQ== X-Gm-Message-State: AJIora9azlPIICcT3ykBVUhmEt7g5ix7uj/ckIqArFBF74PyVMcIpw2O 8fpkaCYWhaiLyVIke9V99+Nz3jBZUCBZ3xTGxQ== X-Google-Smtp-Source: AGRyM1t7p5bQOsZ7cBIoy5YIYG4Vty+5ObB0xcGW4MddH7Fc9hMYX+1F2OdOwVc+nCl0IjFDFNgEYMiRjLwrtJHNPw== X-Received: from kaleshsingh.mtv.corp.google.com ([2620:15c:211:200:5a87:b61e:76b5:d1e0]) (user=kaleshsingh job=sendgmr) by 2002:a25:d117:0:b0:670:7e79:e104 with SMTP id i23-20020a25d117000000b006707e79e104mr11309346ybg.528.1658383060543; Wed, 20 Jul 2022 22:57:40 -0700 (PDT) Date: Wed, 20 Jul 2022 22:57:14 -0700 In-Reply-To: <20220721055728.718573-1-kaleshsingh@google.com> Message-Id: <20220721055728.718573-4-kaleshsingh@google.com> Mime-Version: 1.0 References: <20220721055728.718573-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.37.0.170.g444d1eabd0-goog Subject: [PATCH v5 03/17] arm64: stacktrace: Factor out unwind_next_common() From: Kalesh Singh To: maz@kernel.org, mark.rutland@arm.com, broonie@kernel.org, madvenka@linux.microsoft.com, tabba@google.com Cc: will@kernel.org, qperret@google.com, kaleshsingh@google.com, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, andreyknvl@gmail.com, vincenzo.frascino@arm.com, mhiramat@kernel.org, ast@kernel.org, drjones@redhat.com, wangkefeng.wang@huawei.com, elver@google.com, keirf@google.com, yuzenghui@huawei.com, ardb@kernel.org, oupton@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, android-mm@google.com, kernel-team@android.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Move common unwind_next logic to stacktrace/common.h. This allows reusing the code in the implementation the nVHE hypervisor stack unwinder, later in this series. Signed-off-by: Kalesh Singh Reviewed-by: Fuad Tabba Reviewed-by: Mark Brown --- Changes in v5: - Add Reviewed-by tags from Mark Brown and Fuad arch/arm64/include/asm/stacktrace/common.h | 50 ++++++++++++++++++++++ arch/arm64/kernel/stacktrace.c | 41 ++---------------- 2 files changed, 54 insertions(+), 37 deletions(-) diff --git a/arch/arm64/include/asm/stacktrace/common.h b/arch/arm64/include/asm/stacktrace/common.h index f58b786460d3..0c5cbfdb56b5 100644 --- a/arch/arm64/include/asm/stacktrace/common.h +++ b/arch/arm64/include/asm/stacktrace/common.h @@ -65,6 +65,10 @@ struct unwind_state { static inline bool on_overflow_stack(unsigned long sp, unsigned long size, struct stack_info *info); +static inline bool on_accessible_stack(const struct task_struct *tsk, + unsigned long sp, unsigned long size, + struct stack_info *info); + static inline bool on_stack(unsigned long sp, unsigned long size, unsigned long low, unsigned long high, enum stack_type type, struct stack_info *info) @@ -120,4 +124,50 @@ static inline void unwind_init_common(struct unwind_state *state, state->prev_type = STACK_TYPE_UNKNOWN; } +static inline int unwind_next_common(struct unwind_state *state, + struct stack_info *info) +{ + struct task_struct *tsk = state->task; + unsigned long fp = state->fp; + + if (fp & 0x7) + return -EINVAL; + + if (!on_accessible_stack(tsk, fp, 16, info)) + return -EINVAL; + + if (test_bit(info->type, state->stacks_done)) + return -EINVAL; + + /* + * As stacks grow downward, any valid record on the same stack must be + * at a strictly higher address than the prior record. + * + * Stacks can nest in several valid orders, e.g. + * + * TASK -> IRQ -> OVERFLOW -> SDEI_NORMAL + * TASK -> SDEI_NORMAL -> SDEI_CRITICAL -> OVERFLOW + * + * ... but the nesting itself is strict. Once we transition from one + * stack to another, it's never valid to unwind back to that first + * stack. + */ + if (info->type == state->prev_type) { + if (fp <= state->prev_fp) + return -EINVAL; + } else { + __set_bit(state->prev_type, state->stacks_done); + } + + /* + * Record this frame record's values and location. The prev_fp and + * prev_type are only meaningful to the next unwind_next() invocation. + */ + state->fp = READ_ONCE(*(unsigned long *)(fp)); + state->pc = READ_ONCE(*(unsigned long *)(fp + 8)); + state->prev_fp = fp; + state->prev_type = info->type; + + return 0; +} #endif /* __ASM_STACKTRACE_COMMON_H */ diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index 94a5dd2ab8fd..834851939364 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -81,48 +81,15 @@ static int notrace unwind_next(struct unwind_state *state) struct task_struct *tsk = state->task; unsigned long fp = state->fp; struct stack_info info; + int err; /* Final frame; nothing to unwind */ if (fp == (unsigned long)task_pt_regs(tsk)->stackframe) return -ENOENT; - if (fp & 0x7) - return -EINVAL; - - if (!on_accessible_stack(tsk, fp, 16, &info)) - return -EINVAL; - - if (test_bit(info.type, state->stacks_done)) - return -EINVAL; - - /* - * As stacks grow downward, any valid record on the same stack must be - * at a strictly higher address than the prior record. - * - * Stacks can nest in several valid orders, e.g. - * - * TASK -> IRQ -> OVERFLOW -> SDEI_NORMAL - * TASK -> SDEI_NORMAL -> SDEI_CRITICAL -> OVERFLOW - * - * ... but the nesting itself is strict. Once we transition from one - * stack to another, it's never valid to unwind back to that first - * stack. - */ - if (info.type == state->prev_type) { - if (fp <= state->prev_fp) - return -EINVAL; - } else { - __set_bit(state->prev_type, state->stacks_done); - } - - /* - * Record this frame record's values and location. The prev_fp and - * prev_type are only meaningful to the next unwind_next() invocation. - */ - state->fp = READ_ONCE(*(unsigned long *)(fp)); - state->pc = READ_ONCE(*(unsigned long *)(fp + 8)); - state->prev_fp = fp; - state->prev_type = info.type; + err = unwind_next_common(state, &info); + if (err) + return err; state->pc = ptrauth_strip_insn_pac(state->pc); -- 2.37.0.170.g444d1eabd0-goog