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/* 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;
/* Return the target description for Linux thread TID.
When *HAVE_PTRACE_GETREGSET is TRIBOOL_UNKNOWN then the current value of
xcr0 is read using ptrace calls and stored into *XCR0_STORAGE. Then
XCR0_INIT_CB is called with the value of *XCR0_STORAGE and
*HAVE_PTRACE_GETREGSET is set to TRIBOOL_TRUE.
If the attempt to read xcr0 using ptrace fails then *XCR0_STORAGE is set
to zero and *HAVE_PTRACE_GETREGSET is set to TRIBOOL_FALSE.
The storage pointed to by XCR0_STORAGE must exist until the program
terminates, this storage is used to cache the xcr0 value. As such
XCR0_INIT_CB will only be called once if xcr0 is successfully read using
ptrace, or not at all if the ptrace call fails.
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.
ERROR_MSG is using in an error() call if we try to create a target
description for a 64-bit process but this is a 32-bit build of GDB. */
extern const target_desc *
x86_linux_tdesc_for_tid (int tid, enum tribool *have_ptrace_getregset,
gdb::function_view<void (uint64_t)> xcr0_init_cb,
const char *error_msg, uint64_t *xcr0_storage);
#ifdef __x86_64__
/* Return the right amd64-linux target descriptions according to
XCR0_FEATURES_BIT and IS_X32. This is implemented separately in both
GDB and gdbserver. */
extern const target_desc *amd64_linux_read_description
(uint64_t xcr0_features_bit, bool is_x32);
#endif
/* Return the target description according to XCR0. This is implemented
separately in both GDB and gdbserver. */
extern const struct target_desc *i386_linux_read_description (uint64_t xcr0);
#endif /* NAT_X86_LINUX_TDESC_H */
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