gdb/nat/aarch64-linux.c

   1 /* Copyright (C) 2009-2018 Free Software Foundation, Inc.
   2    Contributed by ARM Ltd.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "common-defs.h"
  20 #include "break-common.h"
  21 #include "nat/linux-nat.h"
  22 #include "nat/aarch64-linux-hw-point.h"
  23 #include "nat/aarch64-linux.h"
  24
  25 #include "elf/common.h"
  26 #include "nat/gdb_ptrace.h"
  27 #include <asm/ptrace.h>
  28 #include <sys/uio.h>
  29
  30 /* Called when resuming a thread LWP.
  31    The hardware debug registers are updated when there is any change.  */
  32
  33 void
  34 aarch64_linux_prepare_to_resume (struct lwp_info *lwp)
  35 {
  36   struct arch_lwp_info *info = lwp_arch_private_info (lwp);
  37
  38   /* NULL means this is the main thread still going through the shell,
  39      or, no watchpoint has been set yet.  In that case, there's
  40      nothing to do.  */
  41   if (info == NULL)
  42     return;
  43
  44   if (DR_HAS_CHANGED (info->dr_changed_bp)
  45       || DR_HAS_CHANGED (info->dr_changed_wp))
  46     {
  47       ptid_t ptid = ptid_of_lwp (lwp);
  48       int tid = ptid_get_lwp (ptid);
  49       struct aarch64_debug_reg_state *state
  50         = aarch64_get_debug_reg_state (ptid.pid ());
  51
  52       if (show_debug_regs)
  53         debug_printf ("prepare_to_resume thread %d\n", tid);
  54
  55       /* Watchpoints.  */
  56       if (DR_HAS_CHANGED (info->dr_changed_wp))
  57         {
  58           aarch64_linux_set_debug_regs (state, tid, 1);
  59           DR_CLEAR_CHANGED (info->dr_changed_wp);
  60         }
  61
  62       /* Breakpoints.  */
  63       if (DR_HAS_CHANGED (info->dr_changed_bp))
  64         {
  65           aarch64_linux_set_debug_regs (state, tid, 0);
  66           DR_CLEAR_CHANGED (info->dr_changed_bp);
  67         }
  68     }
  69 }
  70
  71 /* Function to call when a new thread is detected.  */
  72
  73 void
  74 aarch64_linux_new_thread (struct lwp_info *lwp)
  75 {
  76   struct arch_lwp_info *info = XNEW (struct arch_lwp_info);
  77
  78   /* Mark that all the hardware breakpoint/watchpoint register pairs
  79      for this thread need to be initialized (with data from
  80      aarch_process_info.debug_reg_state).  */
  81   DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs);
  82   DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs);
  83
  84   lwp_set_arch_private_info (lwp, info);
  85 }
  86
  87 /* See nat/aarch64-linux.h.  */
  88
  89 void
  90 aarch64_linux_delete_thread (struct arch_lwp_info *arch_lwp)
  91 {
  92   xfree (arch_lwp);
  93 }
  94
  95 /* Convert native siginfo FROM to the siginfo in the layout of the
  96    inferior's architecture TO.  */
  97
  98 void
  99 aarch64_compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
 100 {
 101   memset (to, 0, sizeof (*to));
 102
 103   to->si_signo = from->si_signo;
 104   to->si_errno = from->si_errno;
 105   to->si_code = from->si_code;
 106
 107   if (to->si_code == SI_TIMER)
 108     {
 109       to->cpt_si_timerid = from->si_timerid;
 110       to->cpt_si_overrun = from->si_overrun;
 111       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 112     }
 113   else if (to->si_code == SI_USER)
 114     {
 115       to->cpt_si_pid = from->si_pid;
 116       to->cpt_si_uid = from->si_uid;
 117     }
 118   else if (to->si_code < 0)
 119     {
 120       to->cpt_si_pid = from->si_pid;
 121       to->cpt_si_uid = from->si_uid;
 122       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 123     }
 124   else
 125     {
 126       switch (to->si_signo)
 127         {
 128         case SIGCHLD:
 129           to->cpt_si_pid = from->si_pid;
 130           to->cpt_si_uid = from->si_uid;
 131           to->cpt_si_status = from->si_status;
 132           to->cpt_si_utime = from->si_utime;
 133           to->cpt_si_stime = from->si_stime;
 134           break;
 135         case SIGILL:
 136         case SIGFPE:
 137         case SIGSEGV:
 138         case SIGBUS:
 139           to->cpt_si_addr = (intptr_t) from->si_addr;
 140           break;
 141         case SIGPOLL:
 142           to->cpt_si_band = from->si_band;
 143           to->cpt_si_fd = from->si_fd;
 144           break;
 145         default:
 146           to->cpt_si_pid = from->si_pid;
 147           to->cpt_si_uid = from->si_uid;
 148           to->cpt_si_ptr = (intptr_t) from->si_ptr;
 149           break;
 150         }
 151     }
 152 }
 153
 154 /* Convert inferior's architecture siginfo FROM to native siginfo TO.  */
 155
 156 void
 157 aarch64_siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
 158 {
 159   memset (to, 0, sizeof (*to));
 160
 161   to->si_signo = from->si_signo;
 162   to->si_errno = from->si_errno;
 163   to->si_code = from->si_code;
 164
 165   if (to->si_code == SI_TIMER)
 166     {
 167       to->si_timerid = from->cpt_si_timerid;
 168       to->si_overrun = from->cpt_si_overrun;
 169       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 170     }
 171   else if (to->si_code == SI_USER)
 172     {
 173       to->si_pid = from->cpt_si_pid;
 174       to->si_uid = from->cpt_si_uid;
 175     }
 176   if (to->si_code < 0)
 177     {
 178       to->si_pid = from->cpt_si_pid;
 179       to->si_uid = from->cpt_si_uid;
 180       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 181     }
 182   else
 183     {
 184       switch (to->si_signo)
 185         {
 186         case SIGCHLD:
 187           to->si_pid = from->cpt_si_pid;
 188           to->si_uid = from->cpt_si_uid;
 189           to->si_status = from->cpt_si_status;
 190           to->si_utime = from->cpt_si_utime;
 191           to->si_stime = from->cpt_si_stime;
 192           break;
 193         case SIGILL:
 194         case SIGFPE:
 195         case SIGSEGV:
 196         case SIGBUS:
 197           to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
 198           break;
 199         case SIGPOLL:
 200           to->si_band = from->cpt_si_band;
 201           to->si_fd = from->cpt_si_fd;
 202           break;
 203         default:
 204           to->si_pid = from->cpt_si_pid;
 205           to->si_uid = from->cpt_si_uid;
 206           to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
 207           break;
 208         }
 209     }
 210 }
 211
 212 /* Called by libthread_db.  Returns a pointer to the thread local
 213    storage (or its descriptor).  */
 214
 215 ps_err_e
 216 aarch64_ps_get_thread_area (struct ps_prochandle *ph,
 217                             lwpid_t lwpid, int idx, void **base,
 218                             int is_64bit_p)
 219 {
 220   struct iovec iovec;
 221   uint64_t reg64;
 222   uint32_t reg32;
 223
 224   if (is_64bit_p)
 225     {
 226       iovec.iov_base = &reg64;
 227       iovec.iov_len = sizeof (reg64);
 228     }
 229   else
 230     {
 231       iovec.iov_base = &reg32;
 232       iovec.iov_len = sizeof (reg32);
 233     }
 234
 235   if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0)
 236     return PS_ERR;
 237
 238   /* IDX is the bias from the thread pointer to the beginning of the
 239      thread descriptor.  It has to be subtracted due to implementation
 240      quirks in libthread_db.  */
 241   if (is_64bit_p)
 242     *base = (void *) (reg64 - idx);
 243   else
 244     *base = (void *) (uintptr_t) (reg32 - idx);
 245
 246   return PS_OK;
 247 }