gdbserver/proc-service.cc

   1 /* libthread_db helper functions for the remote server for GDB.
   2    Copyright (C) 2002-2020 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 appropriate 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 regs_info *regs_info = the_linux_target->get_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   if (read_inferior_memory ((uintptr_t) addr, (gdb_byte *) buf, size) != 0)
  84     return PS_ERR;
  85   return PS_OK;
  86 }
  87
  88 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
  89
  90 ps_err_e
  91 ps_pdwrite (gdb_ps_prochandle_t ph, psaddr_t addr,
  92             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
  93 {
  94   if (target_write_memory ((uintptr_t) addr, (const gdb_byte *) buf, size)
  95       != 0)
  96     return PS_ERR;
  97   return PS_OK;
  98 }
  99
 100 /* Get the general registers of LWP LWPID within the target process PH
 101    and store them in GREGSET.  */
 102
 103 ps_err_e
 104 ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
 105 {
 106 #ifdef HAVE_REGSETS
 107   struct lwp_info *lwp;
 108   struct thread_info *reg_thread, *saved_thread;
 109   struct regcache *regcache;
 110
 111   lwp = find_lwp_pid (ptid_t (lwpid));
 112   if (lwp == NULL)
 113     return PS_ERR;
 114
 115   reg_thread = get_lwp_thread (lwp);
 116   saved_thread = current_thread;
 117   current_thread = reg_thread;
 118   regcache = get_thread_regcache (current_thread, 1);
 119   gregset_info ()->fill_function (regcache, gregset);
 120
 121   current_thread = saved_thread;
 122   return PS_OK;
 123 #else
 124   return PS_ERR;
 125 #endif
 126 }
 127
 128 /* Set the general registers of LWP LWPID within the target process PH
 129    from GREGSET.  */
 130
 131 ps_err_e
 132 ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
 133 {
 134   /* Unneeded.  */
 135   return PS_ERR;
 136 }
 137
 138 /* Get the floating-point registers of LWP LWPID within the target
 139    process PH and store them in FPREGSET.  */
 140
 141 ps_err_e
 142 ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prfpregset_t *fpregset)
 143 {
 144   /* Unneeded.  */
 145   return PS_ERR;
 146 }
 147
 148 /* Set the floating-point registers of LWP LWPID within the target
 149    process PH from FPREGSET.  */
 150
 151 ps_err_e
 152 ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prfpregset_t *fpregset)
 153 {
 154   /* Unneeded.  */
 155   return PS_ERR;
 156 }
 157
 158 /* Return overall process id of the target PH.  Special for GNU/Linux
 159    -- not used on Solaris.  */
 160
 161 pid_t
 162 ps_getpid (gdb_ps_prochandle_t ph)
 163 {
 164   return pid_of (current_thread);
 165 }