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/* GNU/Linux/x86-64 specific target description, for the remote server
for GDB.
Copyright (C) 2017-2024 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 "tdesc.h"
#include "linux-x86-tdesc.h"
#include "arch/i386.h"
#include "gdbsupport/x86-xstate.h"
#ifdef __x86_64__
#include "arch/amd64.h"
#endif
#include "x86-tdesc.h"
/* Return the right x86_linux_tdesc index for a given XCR0. Return
X86_TDESC_LAST if can't find a match. */
static enum x86_linux_tdesc
xcr0_to_tdesc_idx (uint64_t xcr0, bool is_x32)
{
if (xcr0 & X86_XSTATE_PKRU)
{
if (is_x32)
{
/* No x32 MPX and PKU, fall back to avx_avx512. */
return X86_TDESC_AVX_AVX512;
}
else
return X86_TDESC_AVX_MPX_AVX512_PKU;
}
else if (xcr0 & X86_XSTATE_AVX512)
return X86_TDESC_AVX_AVX512;
else if ((xcr0 & X86_XSTATE_AVX_MPX_MASK) == X86_XSTATE_AVX_MPX_MASK)
{
if (is_x32) /* No MPX on x32. */
return X86_TDESC_AVX;
else
return X86_TDESC_AVX_MPX;
}
else if (xcr0 & X86_XSTATE_MPX)
{
if (is_x32) /* No MPX on x32. */
return X86_TDESC_AVX;
else
return X86_TDESC_MPX;
}
else if (xcr0 & X86_XSTATE_AVX)
return X86_TDESC_AVX;
else if (xcr0 & X86_XSTATE_SSE)
return X86_TDESC_SSE;
else if (xcr0 & X86_XSTATE_X87)
return X86_TDESC_MMX;
else
return X86_TDESC_LAST;
}
#if defined __i386__ || !defined IN_PROCESS_AGENT
static struct target_desc *i386_tdescs[X86_TDESC_LAST] = { };
/* Return the target description according to XCR0. */
const struct target_desc *
i386_linux_read_description (uint64_t xcr0)
{
enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, false);
if (idx == X86_TDESC_LAST)
return NULL;
struct target_desc **tdesc = &i386_tdescs[idx];
if (*tdesc == NULL)
{
*tdesc = i386_create_target_description (xcr0, true, false);
init_target_desc (*tdesc, i386_expedite_regs);
}
return *tdesc;;
}
#endif
#ifdef __x86_64__
static target_desc *amd64_tdescs[X86_TDESC_LAST] = { };
static target_desc *x32_tdescs[X86_TDESC_LAST] = { };
const struct target_desc *
amd64_linux_read_description (uint64_t xcr0, bool is_x32)
{
enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, is_x32);
if (idx == X86_TDESC_LAST)
return NULL;
struct target_desc **tdesc = NULL;
if (is_x32)
tdesc = &x32_tdescs[idx];
else
tdesc = &amd64_tdescs[idx];
if (*tdesc == NULL)
{
*tdesc = amd64_create_target_description (xcr0, is_x32, true, true);
init_target_desc (*tdesc, amd64_expedite_regs);
}
return *tdesc;
}
#endif
#ifndef IN_PROCESS_AGENT
int
i386_get_ipa_tdesc_idx (const struct target_desc *tdesc)
{
for (int i = 0; i < X86_TDESC_LAST; i++)
{
if (tdesc == i386_tdescs[i])
return i;
}
/* If none tdesc is found, return the one with minimum features. */
return X86_TDESC_MMX;
}
#if defined __x86_64__
int
amd64_get_ipa_tdesc_idx (const struct target_desc *tdesc)
{
for (int i = 0; i < X86_TDESC_LAST; i++)
{
if (tdesc == amd64_tdescs[i])
return i;
}
for (int i = 0; i < X86_TDESC_LAST; i++)
{
if (tdesc == x32_tdescs[i])
return i;
}
return X86_TDESC_SSE;
}
#endif
#endif
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