164 lines
3.8 KiB
C++
164 lines
3.8 KiB
C++
/* GNU/Linux/x86-64 specific target description, for the remote server
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for GDB.
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Copyright (C) 2017-2022 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 "server.h"
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#include "tdesc.h"
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#include "linux-x86-tdesc.h"
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#include "arch/i386.h"
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#include "gdbsupport/x86-xstate.h"
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#ifdef __x86_64__
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#include "arch/amd64.h"
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#endif
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#include "x86-tdesc.h"
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/* Return the right x86_linux_tdesc index for a given XCR0. Return
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X86_TDESC_LAST if can't find a match. */
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static enum x86_linux_tdesc
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xcr0_to_tdesc_idx (uint64_t xcr0, bool is_x32)
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{
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if (xcr0 & X86_XSTATE_PKRU)
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{
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if (is_x32)
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{
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/* No x32 MPX and PKU, fall back to avx_avx512. */
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return X86_TDESC_AVX_AVX512;
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}
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else
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return X86_TDESC_AVX_MPX_AVX512_PKU;
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}
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else if (xcr0 & X86_XSTATE_AVX512)
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return X86_TDESC_AVX_AVX512;
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else if ((xcr0 & X86_XSTATE_AVX_MPX_MASK) == X86_XSTATE_AVX_MPX_MASK)
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{
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if (is_x32) /* No MPX on x32. */
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return X86_TDESC_AVX;
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else
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return X86_TDESC_AVX_MPX;
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}
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else if (xcr0 & X86_XSTATE_MPX)
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{
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if (is_x32) /* No MPX on x32. */
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return X86_TDESC_AVX;
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else
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return X86_TDESC_MPX;
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}
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else if (xcr0 & X86_XSTATE_AVX)
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return X86_TDESC_AVX;
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else if (xcr0 & X86_XSTATE_SSE)
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return X86_TDESC_SSE;
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else if (xcr0 & X86_XSTATE_X87)
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return X86_TDESC_MMX;
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else
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return X86_TDESC_LAST;
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}
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#if defined __i386__ || !defined IN_PROCESS_AGENT
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static struct target_desc *i386_tdescs[X86_TDESC_LAST] = { };
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/* Return the target description according to XCR0. */
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const struct target_desc *
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i386_linux_read_description (uint64_t xcr0)
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{
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enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, false);
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if (idx == X86_TDESC_LAST)
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return NULL;
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struct target_desc **tdesc = &i386_tdescs[idx];
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if (*tdesc == NULL)
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{
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*tdesc = i386_create_target_description (xcr0, true, false);
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init_target_desc (*tdesc, i386_expedite_regs);
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}
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return *tdesc;;
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}
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#endif
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#ifdef __x86_64__
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static target_desc *amd64_tdescs[X86_TDESC_LAST] = { };
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static target_desc *x32_tdescs[X86_TDESC_LAST] = { };
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const struct target_desc *
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amd64_linux_read_description (uint64_t xcr0, bool is_x32)
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{
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enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, is_x32);
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if (idx == X86_TDESC_LAST)
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return NULL;
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struct target_desc **tdesc = NULL;
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if (is_x32)
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tdesc = &x32_tdescs[idx];
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else
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tdesc = &amd64_tdescs[idx];
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if (*tdesc == NULL)
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{
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*tdesc = amd64_create_target_description (xcr0, is_x32, true, true);
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init_target_desc (*tdesc, amd64_expedite_regs);
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}
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return *tdesc;
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}
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#endif
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#ifndef IN_PROCESS_AGENT
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int
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i386_get_ipa_tdesc_idx (const struct target_desc *tdesc)
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{
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for (int i = 0; i < X86_TDESC_LAST; i++)
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{
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if (tdesc == i386_tdescs[i])
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return i;
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}
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/* If none tdesc is found, return the one with minimum features. */
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return X86_TDESC_MMX;
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}
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#if defined __x86_64__
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int
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amd64_get_ipa_tdesc_idx (const struct target_desc *tdesc)
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{
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for (int i = 0; i < X86_TDESC_LAST; i++)
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{
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if (tdesc == amd64_tdescs[i])
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return i;
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}
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for (int i = 0; i < X86_TDESC_LAST; i++)
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{
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if (tdesc == x32_tdescs[i])
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return i;
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}
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return X86_TDESC_SSE;
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}
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#endif
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#endif
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