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/* x86 XSAVE extended state functions.
Copyright (C) 2022-2024 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 <http://www.gnu.org/licenses/>. */
#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 ebx;
if (!x86_cpuid_count (0xd, 0, nullptr, &ebx, nullptr, nullptr))
return 0;
return ebx;
}
/* 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.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;
}
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