gdb/nat/aarch64-linux.c

   1 /* Copyright (C) 2009-2016 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_get_pid (ptid));
  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 /* Convert native siginfo FROM to the siginfo in the layout of the
  88    inferior's architecture TO.  */
  89
  90 void
  91 aarch64_compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
  92 {
  93   memset (to, 0, sizeof (*to));
  94
  95   to->si_signo = from->si_signo;
  96   to->si_errno = from->si_errno;
  97   to->si_code = from->si_code;
  98
  99   if (to->si_code == SI_TIMER)
 100     {
 101       to->cpt_si_timerid = from->si_timerid;
 102       to->cpt_si_overrun = from->si_overrun;
 103       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 104     }
 105   else if (to->si_code == SI_USER)
 106     {
 107       to->cpt_si_pid = from->si_pid;
 108       to->cpt_si_uid = from->si_uid;
 109     }
 110   else if (to->si_code < 0)
 111     {
 112       to->cpt_si_pid = from->si_pid;
 113       to->cpt_si_uid = from->si_uid;
 114       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 115     }
 116   else
 117     {
 118       switch (to->si_signo)
 119         {
 120         case SIGCHLD:
 121           to->cpt_si_pid = from->si_pid;
 122           to->cpt_si_uid = from->si_uid;
 123           to->cpt_si_status = from->si_status;
 124           to->cpt_si_utime = from->si_utime;
 125           to->cpt_si_stime = from->si_stime;
 126           break;
 127         case SIGILL:
 128         case SIGFPE:
 129         case SIGSEGV:
 130         case SIGBUS:
 131           to->cpt_si_addr = (intptr_t) from->si_addr;
 132           break;
 133         case SIGPOLL:
 134           to->cpt_si_band = from->si_band;
 135           to->cpt_si_fd = from->si_fd;
 136           break;
 137         default:
 138           to->cpt_si_pid = from->si_pid;
 139           to->cpt_si_uid = from->si_uid;
 140           to->cpt_si_ptr = (intptr_t) from->si_ptr;
 141           break;
 142         }
 143     }
 144 }
 145
 146 /* Convert inferior's architecture siginfo FROM to native siginfo TO.  */
 147
 148 void
 149 aarch64_siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
 150 {
 151   memset (to, 0, sizeof (*to));
 152
 153   to->si_signo = from->si_signo;
 154   to->si_errno = from->si_errno;
 155   to->si_code = from->si_code;
 156
 157   if (to->si_code == SI_TIMER)
 158     {
 159       to->si_timerid = from->cpt_si_timerid;
 160       to->si_overrun = from->cpt_si_overrun;
 161       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 162     }
 163   else if (to->si_code == SI_USER)
 164     {
 165       to->si_pid = from->cpt_si_pid;
 166       to->si_uid = from->cpt_si_uid;
 167     }
 168   if (to->si_code < 0)
 169     {
 170       to->si_pid = from->cpt_si_pid;
 171       to->si_uid = from->cpt_si_uid;
 172       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 173     }
 174   else
 175     {
 176       switch (to->si_signo)
 177         {
 178         case SIGCHLD:
 179           to->si_pid = from->cpt_si_pid;
 180           to->si_uid = from->cpt_si_uid;
 181           to->si_status = from->cpt_si_status;
 182           to->si_utime = from->cpt_si_utime;
 183           to->si_stime = from->cpt_si_stime;
 184           break;
 185         case SIGILL:
 186         case SIGFPE:
 187         case SIGSEGV:
 188         case SIGBUS:
 189           to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
 190           break;
 191         case SIGPOLL:
 192           to->si_band = from->cpt_si_band;
 193           to->si_fd = from->cpt_si_fd;
 194           break;
 195         default:
 196           to->si_pid = from->cpt_si_pid;
 197           to->si_uid = from->cpt_si_uid;
 198           to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
 199           break;
 200         }
 201     }
 202 }
 203
 204 /* Called by libthread_db.  Returns a pointer to the thread local
 205    storage (or its descriptor).  */
 206
 207 ps_err_e
 208 aarch64_ps_get_thread_area (struct ps_prochandle *ph,
 209                             lwpid_t lwpid, int idx, void **base,
 210                             int is_64bit_p)
 211 {
 212   struct iovec iovec;
 213   uint64_t reg64;
 214   uint32_t reg32;
 215
 216   if (is_64bit_p)
 217     {
 218       iovec.iov_base = &reg64;
 219       iovec.iov_len = sizeof (reg64);
 220     }
 221   else
 222     {
 223       iovec.iov_base = &reg32;
 224       iovec.iov_len = sizeof (reg32);
 225     }
 226
 227   if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0)
 228     return PS_ERR;
 229
 230   /* IDX is the bias from the thread pointer to the beginning of the
 231      thread descriptor.  It has to be subtracted due to implementation
 232      quirks in libthread_db.  */
 233   if (is_64bit_p)
 234     *base = (void *) (reg64 - idx);
 235   else
 236     *base = (void *) (uintptr_t) (reg32 - idx);
 237
 238   return PS_OK;
 239 }