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/* Native-dependent code for GNU/Linux on LoongArch processors.
Copyright (C) 2024 Free Software Foundation, Inc.
Contributed by Loongson Ltd.
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 "gdbsupport/common-defs.h"
#include "gdbsupport/break-common.h"
#include "nat/linux-nat.h"
#include "nat/loongarch-linux-hw-point.h"
#include "nat/loongarch-linux.h"
#include "elf/common.h"
#include "nat/gdb_ptrace.h"
#include <asm/ptrace.h>
#include <sys/uio.h>
/* Called when resuming a thread LWP.
The hardware debug registers are updated when there is any change. */
void
loongarch_linux_prepare_to_resume (struct lwp_info *lwp)
{
struct arch_lwp_info *info = lwp_arch_private_info (lwp);
/* NULL means this is the main thread still going through the shell,
or, no watchpoint has been set yet. In that case, there's
nothing to do. */
if (info == NULL)
return;
if (DR_HAS_CHANGED (info->dr_changed_bp)
|| DR_HAS_CHANGED (info->dr_changed_wp))
{
ptid_t ptid = ptid_of_lwp (lwp);
int tid = ptid.lwp ();
struct loongarch_debug_reg_state *state
= loongarch_get_debug_reg_state (ptid.pid ());
if (show_debug_regs)
debug_printf ("prepare_to_resume thread %d\n", tid);
/* Watchpoints. */
if (DR_HAS_CHANGED (info->dr_changed_wp))
{
loongarch_linux_set_debug_regs (state, tid, 1);
DR_CLEAR_CHANGED (info->dr_changed_wp);
}
/* Breakpoints. */
if (DR_HAS_CHANGED (info->dr_changed_bp))
{
loongarch_linux_set_debug_regs (state, tid, 0);
DR_CLEAR_CHANGED (info->dr_changed_bp);
}
}
}
/* Function to call when a new thread is detected. */
void
loongarch_linux_new_thread (struct lwp_info *lwp)
{
ptid_t ptid = ptid_of_lwp (lwp);
struct loongarch_debug_reg_state *state
= loongarch_get_debug_reg_state (ptid.pid ());
struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
/* If there are hardware breakpoints/watchpoints in the process then mark that
all the hardware breakpoint/watchpoint register pairs for this thread need
to be initialized (with data from arch_process_info.debug_reg_state). */
if (loongarch_any_set_debug_regs_state (state, false))
DR_MARK_ALL_CHANGED (info->dr_changed_bp, loongarch_num_bp_regs);
if (loongarch_any_set_debug_regs_state (state, true))
DR_MARK_ALL_CHANGED (info->dr_changed_wp, loongarch_num_wp_regs);
lwp_set_arch_private_info (lwp, info);
}
/* See nat/loongarch-linux.h. */
void
loongarch_linux_delete_thread (struct arch_lwp_info *arch_lwp)
{
xfree (arch_lwp);
}
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