From patchwork Thu Apr 27 21:00:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Baldwin X-Patchwork-Id: 68410 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 6E5DC385381F for ; Thu, 27 Apr 2023 21:02:22 +0000 (GMT) X-Original-To: gdb-patches@sourceware.org Delivered-To: gdb-patches@sourceware.org Received: from mail.baldwin.cx (bigwig.baldwin.cx [IPv6:2607:f138:0:13::2]) by sourceware.org (Postfix) with ESMTPS id 85B673858C66 for ; Thu, 27 Apr 2023 21:01:33 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 85B673858C66 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=FreeBSD.org Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=FreeBSD.org Received: from ralph.baldwin.net (c-98-35-126-114.hsd1.ca.comcast.net [98.35.126.114]) by mail.baldwin.cx (Postfix) with ESMTPSA id 3171C1A84E1F for ; Thu, 27 Apr 2023 17:01:31 -0400 (EDT) From: John Baldwin To: gdb-patches@sourceware.org Subject: [PATCH v5 05/19] x86 nat: Add helper functions to save the XSAVE layout for the host. Date: Thu, 27 Apr 2023 14:00:59 -0700 Message-Id: <20230427210113.45380-6-jhb@FreeBSD.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230427210113.45380-1-jhb@FreeBSD.org> References: <20230427210113.45380-1-jhb@FreeBSD.org> MIME-Version: 1.0 X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.6.4 (mail.baldwin.cx [0.0.0.0]); Thu, 27 Apr 2023 17:01:31 -0400 (EDT) X-Virus-Scanned: clamav-milter 0.103.1 at mail.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-11.9 required=5.0 tests=BAYES_00, FORGED_SPF_HELO, GIT_PATCH_0, KAM_DMARC_STATUS, KAM_SHORT, KHOP_HELO_FCRDNS, SPF_HELO_PASS, SPF_SOFTFAIL, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces+patchwork=sourceware.org@sourceware.org Sender: "Gdb-patches" x86_xsave_length returns the total length of the XSAVE state area standard format as queried from CPUID. x86_fetch_xsave_layout uses CPUID to query the offsets of XSAVE extended regions from the running host. The total length of the XSAVE state area can either be supplied the caller if known (e.g. from FreeBSD's PT_GETXSTATEINFO) or it can be queried from the running host using x86_xsave_length. --- gdb/nat/x86-xstate.c | 67 ++++++++++++++++++++++++++++++++++++++++++++ gdb/nat/x86-xstate.h | 35 +++++++++++++++++++++++ 2 files changed, 102 insertions(+) create mode 100644 gdb/nat/x86-xstate.c create mode 100644 gdb/nat/x86-xstate.h diff --git a/gdb/nat/x86-xstate.c b/gdb/nat/x86-xstate.c new file mode 100644 index 00000000000..9fdc572356a --- /dev/null +++ b/gdb/nat/x86-xstate.c @@ -0,0 +1,67 @@ +/* x86 XSAVE extended state functions. + + Copyright (C) 2022-2023 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#include "gdbsupport/common-defs.h" +#include "gdbsupport/x86-xstate.h" +#include "nat/x86-cpuid.h" +#include "nat/x86-xstate.h" + +/* Fetch the offset of a specific XSAVE extended region. */ + +static int +xsave_feature_offset (uint64_t xcr0, int feature) +{ + uint32_t ebx; + + if ((xcr0 & (1ULL << feature)) == 0) + return 0; + + if (!x86_cpuid_count (0xd, feature, nullptr, &ebx, nullptr, nullptr)) + return 0; + return ebx; +} + +/* See x86-xstate.h. */ + +int +x86_xsave_length () +{ + uint32_t ecx; + + if (!x86_cpuid_count (0xd, 0, nullptr, nullptr, &ecx, nullptr)) + return 0; + return ecx; +} + +/* See x86-xstate.h. */ + +x86_xsave_layout +x86_fetch_xsave_layout (uint64_t xcr0, int len) +{ + x86_xsave_layout layout; + layout.sizeof_xsave = len; + layout.avx_offset = xsave_feature_offset (xcr0, X86_XSTATE_AVX_ID); + layout.bndregs_offset = xsave_feature_offset (xcr0, X86_XSTATE_BNDREGS_ID); + layout.bndcfg_offset = xsave_feature_offset (xcr0, X86_XSTATE_BNDCFG_ID); + layout.k_offset = xsave_feature_offset (xcr0, X86_XSTATE_K_ID); + layout.zmm_h_offset = xsave_feature_offset (xcr0, X86_XSTATE_ZMM_H_ID); + layout.zmm_offset = xsave_feature_offset (xcr0, X86_XSTATE_ZMM_ID); + layout.pkru_offset = xsave_feature_offset (xcr0, X86_XSTATE_PKRU_ID); + return layout; +} diff --git a/gdb/nat/x86-xstate.h b/gdb/nat/x86-xstate.h new file mode 100644 index 00000000000..30f3a35087e --- /dev/null +++ b/gdb/nat/x86-xstate.h @@ -0,0 +1,35 @@ +/* x86 XSAVE extended state functions. + + Copyright (C) 2022-2023 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef NAT_X86_XSTATE_H +#define NAT_X86_XSTATE_H + +#include "gdbsupport/x86-xstate.h" + +/* Return the size of the XSAVE extended state fetched via CPUID. */ + +int x86_xsave_length (); + +/* Return the layout (size and offsets) of the XSAVE extended regions + for the running host. Offsets of each of the enabled regions in + XCR0 are fetched via CPUID. */ + +x86_xsave_layout x86_fetch_xsave_layout (uint64_t xcr0, int len); + +#endif /* NAT_X86_XSTATE_H */