gdb/nat/loongarch-linux.c

   1 /* Native-dependent code for GNU/Linux on LoongArch processors.
   2
   3    Copyright (C) 2024 Free Software Foundation, Inc.
   4    Contributed by Loongson Ltd.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "gdbsupport/break-common.h"
  22 #include "nat/linux-nat.h"
  23 #include "nat/loongarch-linux-hw-point.h"
  24 #include "nat/loongarch-linux.h"
  25
  26 #include "elf/common.h"
  27 #include "nat/gdb_ptrace.h"
  28 #include <asm/ptrace.h>
  29 #include <sys/uio.h>
  30
  31 /* Called when resuming a thread LWP.
  32    The hardware debug registers are updated when there is any change.  */
  33
  34 void
  35 loongarch_linux_prepare_to_resume (struct lwp_info *lwp)
  36 {
  37   struct arch_lwp_info *info = lwp_arch_private_info (lwp);
  38
  39   /* NULL means this is the main thread still going through the shell,
  40      or, no watchpoint has been set yet.  In that case, there's
  41      nothing to do.  */
  42   if (info == NULL)
  43     return;
  44
  45   if (DR_HAS_CHANGED (info->dr_changed_bp)
  46       || DR_HAS_CHANGED (info->dr_changed_wp))
  47     {
  48       ptid_t ptid = ptid_of_lwp (lwp);
  49       int tid = ptid.lwp ();
  50       struct loongarch_debug_reg_state *state
  51         = loongarch_get_debug_reg_state (ptid.pid ());
  52
  53       if (show_debug_regs)
  54         debug_printf ("prepare_to_resume thread %d\n", tid);
  55
  56       /* Watchpoints.  */
  57       if (DR_HAS_CHANGED (info->dr_changed_wp))
  58         {
  59           loongarch_linux_set_debug_regs (state, tid, 1);
  60           DR_CLEAR_CHANGED (info->dr_changed_wp);
  61         }
  62
  63       /* Breakpoints.  */
  64       if (DR_HAS_CHANGED (info->dr_changed_bp))
  65         {
  66           loongarch_linux_set_debug_regs (state, tid, 0);
  67           DR_CLEAR_CHANGED (info->dr_changed_bp);
  68         }
  69     }
  70 }
  71
  72 /* Function to call when a new thread is detected.  */
  73
  74 void
  75 loongarch_linux_new_thread (struct lwp_info *lwp)
  76 {
  77   ptid_t ptid = ptid_of_lwp (lwp);
  78   struct loongarch_debug_reg_state *state
  79         = loongarch_get_debug_reg_state (ptid.pid ());
  80   struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
  81
  82   /* If there are hardware breakpoints/watchpoints in the process then mark that
  83      all the hardware breakpoint/watchpoint register pairs for this thread need
  84      to be initialized (with data from arch_process_info.debug_reg_state).  */
  85   if (loongarch_any_set_debug_regs_state (state, false))
  86     DR_MARK_ALL_CHANGED (info->dr_changed_bp, loongarch_num_bp_regs);
  87   if (loongarch_any_set_debug_regs_state (state, true))
  88     DR_MARK_ALL_CHANGED (info->dr_changed_wp, loongarch_num_wp_regs);
  89
  90   lwp_set_arch_private_info (lwp, info);
  91 }
  92
  93 /* See nat/loongarch-linux.h.  */
  94
  95 void
  96 loongarch_linux_delete_thread (struct arch_lwp_info *arch_lwp)
  97 {
  98   xfree (arch_lwp);
  99 }