2e639674c5
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 by the caller if known (e.g. from FreeBSD's PT_GETXSTATEINFO) or it can be queried from the running host using x86_xsave_length. Approved-By: Simon Marchi <simon.marchi@efficios.com>
67 lines
2 KiB
C
67 lines
2 KiB
C
/* x86 XSAVE extended state functions.
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Copyright (C) 2022-2023 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "gdbsupport/common-defs.h"
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#include "gdbsupport/x86-xstate.h"
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#include "nat/x86-cpuid.h"
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#include "nat/x86-xstate.h"
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/* Fetch the offset of a specific XSAVE extended region. */
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static int
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xsave_feature_offset (uint64_t xcr0, int feature)
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{
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uint32_t ebx;
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if ((xcr0 & (1ULL << feature)) == 0)
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return 0;
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if (!x86_cpuid_count (0xd, feature, nullptr, &ebx, nullptr, nullptr))
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return 0;
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return ebx;
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}
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/* See x86-xstate.h. */
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int
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x86_xsave_length ()
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{
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uint32_t ecx;
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if (!x86_cpuid_count (0xd, 0, nullptr, nullptr, &ecx, nullptr))
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return 0;
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return ecx;
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}
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/* See x86-xstate.h. */
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x86_xsave_layout
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x86_fetch_xsave_layout (uint64_t xcr0, int len)
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{
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x86_xsave_layout layout;
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layout.sizeof_xsave = len;
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layout.avx_offset = xsave_feature_offset (xcr0, X86_XSTATE_AVX_ID);
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layout.bndregs_offset = xsave_feature_offset (xcr0, X86_XSTATE_BNDREGS_ID);
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layout.bndcfg_offset = xsave_feature_offset (xcr0, X86_XSTATE_BNDCFG_ID);
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layout.k_offset = xsave_feature_offset (xcr0, X86_XSTATE_K_ID);
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layout.zmm_h_offset = xsave_feature_offset (xcr0, X86_XSTATE_ZMM_H_ID);
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layout.zmm_offset = xsave_feature_offset (xcr0, X86_XSTATE_ZMM_ID);
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layout.pkru_offset = xsave_feature_offset (xcr0, X86_XSTATE_PKRU_ID);
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return layout;
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}
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