gdb/nat/x86-linux-tdesc.h

/* Target description related code for GNU/Linux x86 (i386 and x86-64).

   Copyright (C) 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/>.  */

#ifndef NAT_X86_LINUX_TDESC_H
#define NAT_X86_LINUX_TDESC_H

#include "gdbsupport/function-view.h"

struct target_desc;
struct x86_xsave_layout;

/* Return the target description for Linux thread TID.

   The storage pointed to by XCR0_STORAGE and XSAVE_LAYOUT_STORAGE must
   exist until the program (GDB or gdbserver) terminates, this storage is
   used to cache the xcr0 and xsave layout values.  The values pointed to
   by these arguments are only updated at most once, the first time this
   function is called if the have_ptrace_getregset global is set to
   TRIBOOL_UNKNOWN.

   This function returns a target description based on the extracted xcr0
   value along with other characteristics of the thread identified by TID.

   This function can return nullptr if we encounter a machine configuration
   for which a target_desc cannot be created.  Ideally this would not be
   the case, we should be able to create a target description for every
   possible machine configuration.  See amd64_linux_read_description and
   i386_linux_read_description for cases when nullptr might be
   returned.  */

extern const target_desc *x86_linux_tdesc_for_tid
  (int tid, uint64_t *xcr0_storage, x86_xsave_layout *xsave_layout_storage);

#endif /* NAT_X86_LINUX_TDESC_H */