forked from Imagelibrary/binutils-gdb
d01e823438
This updates the copyright headers to include 2025. I did this by running gdb/copyright.py and then manually modifying a few files as noted by the script. Approved-By: Eli Zaretskii <eliz@gnu.org>
129 lines
3.1 KiB
C
129 lines
3.1 KiB
C
/* Native-dependent code for GNU/Linux x86 (i386 and x86-64).
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Copyright (C) 1999-2025 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 "x86-linux.h"
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#include "x86-linux-dregs.h"
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#include "nat/gdb_ptrace.h"
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#include <sys/user.h>
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/* Per-thread arch-specific data we want to keep. */
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struct arch_lwp_info
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{
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/* Non-zero if our copy differs from what's recorded in the
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thread. */
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int debug_registers_changed;
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};
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/* See nat/x86-linux.h. */
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void
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lwp_set_debug_registers_changed (struct lwp_info *lwp, int value)
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{
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if (lwp_arch_private_info (lwp) == NULL)
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lwp_set_arch_private_info (lwp, XCNEW (struct arch_lwp_info));
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lwp_arch_private_info (lwp)->debug_registers_changed = value;
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}
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/* See nat/x86-linux.h. */
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int
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lwp_debug_registers_changed (struct lwp_info *lwp)
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{
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struct arch_lwp_info *info = lwp_arch_private_info (lwp);
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/* NULL means either that this is the main thread still going
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through the shell, or that no watchpoint has been set yet.
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The debug registers are unchanged in either case. */
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if (info == NULL)
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return 0;
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return info->debug_registers_changed;
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}
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/* See nat/x86-linux.h. */
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void
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x86_linux_new_thread (struct lwp_info *lwp)
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{
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lwp_set_debug_registers_changed (lwp, 1);
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}
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/* See nat/x86-linux.h. */
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void
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x86_linux_delete_thread (struct arch_lwp_info *arch_lwp)
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{
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xfree (arch_lwp);
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}
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/* See nat/x86-linux.h. */
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void
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x86_linux_prepare_to_resume (struct lwp_info *lwp)
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{
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x86_linux_update_debug_registers (lwp);
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}
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#ifdef __x86_64__
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/* Value of CS segment register:
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64bit process: 0x33
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32bit process: 0x23 */
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#define AMD64_LINUX_USER64_CS 0x33
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/* Value of DS segment register:
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LP64 process: 0x0
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X32 process: 0x2b */
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#define AMD64_LINUX_X32_DS 0x2b
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#endif
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/* See nat/x86-linux.h. */
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x86_linux_arch_size
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x86_linux_ptrace_get_arch_size (int tid)
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{
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#ifdef __x86_64__
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unsigned long cs;
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unsigned long ds;
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/* Get CS register. */
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errno = 0;
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cs = ptrace (PTRACE_PEEKUSER, tid,
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offsetof (struct user_regs_struct, cs), 0);
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if (errno != 0)
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perror_with_name (_("Couldn't get CS register"));
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bool is_64bit = cs == AMD64_LINUX_USER64_CS;
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/* Get DS register. */
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errno = 0;
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ds = ptrace (PTRACE_PEEKUSER, tid,
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offsetof (struct user_regs_struct, ds), 0);
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if (errno != 0)
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perror_with_name (_("Couldn't get DS register"));
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bool is_x32 = ds == AMD64_LINUX_X32_DS;
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return x86_linux_arch_size (is_64bit, is_x32);
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#else
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return x86_linux_arch_size (false, false);
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#endif
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}
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