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/* Native-dependent code for FreeBSD x86.
Copyright (C) 2022-2023 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 "defs.h"
#include "x86-fbsd-nat.h"
#ifdef PT_GETXSTATE_INFO
#include "nat/x86-xstate.h"
#endif
/* Implement the virtual fbsd_nat_target::low_new_fork method. */
void
x86_fbsd_nat_target::low_new_fork (ptid_t parent, pid_t child)
{
struct x86_debug_reg_state *parent_state, *child_state;
/* If there is no parent state, no watchpoints nor breakpoints have
been set, so there is nothing to do. */
parent_state = x86_lookup_debug_reg_state (parent.pid ());
if (parent_state == nullptr)
return;
/* The kernel clears debug registers in the new child process after
fork, but GDB core assumes the child inherits the watchpoints/hw
breakpoints of the parent, and will remove them all from the
forked off process. Copy the debug registers mirrors into the
new process so that all breakpoints and watchpoints can be
removed together. */
child_state = x86_debug_reg_state (child);
*child_state = *parent_state;
}
#ifdef PT_GETXSTATE_INFO
void
x86_fbsd_nat_target::probe_xsave_layout (pid_t pid)
{
if (m_xsave_probed)
return;
m_xsave_probed = true;
if (ptrace (PT_GETXSTATE_INFO, pid, (PTRACE_TYPE_ARG3) &m_xsave_info,
sizeof (m_xsave_info)) != 0)
return;
if (m_xsave_info.xsave_len != 0)
m_xsave_layout = x86_fetch_xsave_layout (m_xsave_info.xsave_mask,
m_xsave_info.xsave_len);
}
#endif
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