gdb/gdbserver/proc-service.c

   1 /* libthread_db helper functions for the remote server for GDB.
   2    Copyright (C) 2002-2015 Free Software Foundation, Inc.
   3
   4    Contributed by MontaVista Software.
   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 "server.h"
  22
  23 /* This file is currently tied to GNU/Linux.  It should scale well to
  24    another libthread_db implementation, with the approriate gdbserver
  25    hooks, but for now this means we can use GNU/Linux's target data.  */
  26
  27 #include "linux-low.h"
  28
  29 #include "gdb_proc_service.h"
  30
  31 typedef struct ps_prochandle *gdb_ps_prochandle_t;
  32 typedef void *gdb_ps_read_buf_t;
  33 typedef const void *gdb_ps_write_buf_t;
  34 typedef size_t gdb_ps_size_t;
  35
  36 #ifdef HAVE_LINUX_REGSETS
  37 #define HAVE_REGSETS
  38 #endif
  39
  40 #ifdef HAVE_REGSETS
  41 static struct regset_info *
  42 gregset_info (void)
  43 {
  44   int i = 0;
  45   const struct regs_info *regs_info = (*the_low_target.regs_info) ();
  46   struct regsets_info *regsets_info = regs_info->regsets_info;
  47
  48   while (regsets_info->regsets[i].size != -1)
  49     {
  50       if (regsets_info->regsets[i].type == GENERAL_REGS)
  51         break;
  52       i++;
  53     }
  54
  55   return &regsets_info->regsets[i];
  56 }
  57 #endif
  58
  59 /* Search for the symbol named NAME within the object named OBJ within
  60    the target process PH.  If the symbol is found the address of the
  61    symbol is stored in SYM_ADDR.  */
  62
  63 ps_err_e
  64 ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *obj,
  65                    const char *name, psaddr_t *sym_addr)
  66 {
  67   CORE_ADDR addr;
  68
  69   if (thread_db_look_up_one_symbol (name, &addr) == 0)
  70     return PS_NOSYM;
  71
  72   *sym_addr = (psaddr_t) (unsigned long) addr;
  73   return PS_OK;
  74 }
  75
  76 /* Read SIZE bytes from the target process PH at address ADDR and copy
  77    them into BUF.  */
  78
  79 ps_err_e
  80 ps_pdread (gdb_ps_prochandle_t ph, psaddr_t addr,
  81            gdb_ps_read_buf_t buf, gdb_ps_size_t size)
  82 {
  83   read_inferior_memory ((unsigned long) addr, buf, size);
  84   return PS_OK;
  85 }
  86
  87 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
  88
  89 ps_err_e
  90 ps_pdwrite (gdb_ps_prochandle_t ph, psaddr_t addr,
  91             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
  92 {
  93   if (write_inferior_memory ((unsigned long) addr, buf, size) != 0)
  94     return PS_ERR;
  95   return PS_OK;
  96 }
  97
  98 /* Get the general registers of LWP LWPID within the target process PH
  99    and store them in GREGSET.  */
 100
 101 ps_err_e
 102 ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
 103 {
 104 #ifdef HAVE_REGSETS
 105   struct lwp_info *lwp;
 106   struct thread_info *reg_thread, *saved_thread;
 107   struct regcache *regcache;
 108
 109   lwp = find_lwp_pid (pid_to_ptid (lwpid));
 110   if (lwp == NULL)
 111     return PS_ERR;
 112
 113   reg_thread = get_lwp_thread (lwp);
 114   saved_thread = current_thread;
 115   current_thread = reg_thread;
 116   regcache = get_thread_regcache (current_thread, 1);
 117   gregset_info ()->fill_function (regcache, gregset);
 118
 119   current_thread = saved_thread;
 120   return PS_OK;
 121 #else
 122   return PS_ERR;
 123 #endif
 124 }
 125
 126 /* Set the general registers of LWP LWPID within the target process PH
 127    from GREGSET.  */
 128
 129 ps_err_e
 130 ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
 131 {
 132   /* Unneeded.  */
 133   return PS_ERR;
 134 }
 135
 136 /* Get the floating-point registers of LWP LWPID within the target
 137    process PH and store them in FPREGSET.  */
 138
 139 ps_err_e
 140 ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prfpregset_t *fpregset)
 141 {
 142   /* Unneeded.  */
 143   return PS_ERR;
 144 }
 145
 146 /* Set the floating-point registers of LWP LWPID within the target
 147    process PH from FPREGSET.  */
 148
 149 ps_err_e
 150 ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prfpregset_t *fpregset)
 151 {
 152   /* Unneeded.  */
 153   return PS_ERR;
 154 }
 155
 156 /* Return overall process id of the target PH.  Special for GNU/Linux
 157    -- not used on Solaris.  */
 158
 159 pid_t
 160 ps_getpid (gdb_ps_prochandle_t ph)
 161 {
 162   return pid_of (current_thread);
 163 }