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- /* GNU/Linux/x86-64 specific target description, for the remote server
- for GDB.
- Copyright (C) 2017-2022 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 "server.h"
- #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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