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      1 /* libthread_db helper functions for the remote server for GDB.
      2    Copyright (C) 2002-2024 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 
     22 /* This file is currently tied to GNU/Linux.  It should scale well to
     23    another libthread_db implementation, with the appropriate gdbserver
     24    hooks, but for now this means we can use GNU/Linux's target data.  */
     25 
     26 #include "linux-low.h"
     27 
     28 #include "gdb_proc_service.h"
     29 
     30 typedef struct ps_prochandle *gdb_ps_prochandle_t;
     31 typedef void *gdb_ps_read_buf_t;
     32 typedef const void *gdb_ps_write_buf_t;
     33 typedef size_t gdb_ps_size_t;
     34 
     35 #ifdef HAVE_LINUX_REGSETS
     36 #define HAVE_REGSETS
     37 #endif
     38 
     39 #ifdef HAVE_REGSETS
     40 static struct regset_info *
     41 gregset_info (void)
     42 {
     43   int i = 0;
     44   const regs_info *regs_info = the_linux_target->get_regs_info ();
     45   struct regsets_info *regsets_info = regs_info->regsets_info;
     46 
     47   while (regsets_info->regsets[i].size != -1)
     48     {
     49       if (regsets_info->regsets[i].type == GENERAL_REGS)
     50 	break;
     51       i++;
     52     }
     53 
     54   return &regsets_info->regsets[i];
     55 }
     56 #endif
     57 
     58 /* Search for the symbol named NAME within the object named OBJ within
     59    the target process PH.  If the symbol is found the address of the
     60    symbol is stored in SYM_ADDR.  */
     61 
     62 ps_err_e
     63 ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *obj,
     64 		   const char *name, psaddr_t *sym_addr)
     65 {
     66   CORE_ADDR addr;
     67 
     68   if (thread_db_look_up_one_symbol (name, &addr) == 0)
     69     return PS_NOSYM;
     70 
     71   *sym_addr = (psaddr_t) (unsigned long) addr;
     72   return PS_OK;
     73 }
     74 
     75 /* Read SIZE bytes from the target process PH at address ADDR and copy
     76    them into BUF.  */
     77 
     78 ps_err_e
     79 ps_pdread (gdb_ps_prochandle_t ph, psaddr_t addr,
     80 	   gdb_ps_read_buf_t buf, gdb_ps_size_t size)
     81 {
     82   if (read_inferior_memory ((uintptr_t) addr, (gdb_byte *) buf, size) != 0)
     83     return PS_ERR;
     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 (target_write_memory ((uintptr_t) addr, (const gdb_byte *) buf, size)
     94       != 0)
     95     return PS_ERR;
     96   return PS_OK;
     97 }
     98 
     99 /* Get the general registers of LWP LWPID within the target process PH
    100    and store them in GREGSET.  */
    101 
    102 ps_err_e
    103 ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
    104 {
    105 #ifdef HAVE_REGSETS
    106   struct lwp_info *lwp;
    107   struct regcache *regcache;
    108 
    109   lwp = find_lwp_pid (ptid_t (lwpid));
    110   if (lwp == NULL)
    111     return PS_ERR;
    112 
    113   scoped_restore_current_thread restore_thread;
    114   switch_to_thread (get_lwp_thread (lwp));
    115   regcache = get_thread_regcache (current_thread, 1);
    116   gregset_info ()->fill_function (regcache, gregset);
    117 
    118   return PS_OK;
    119 #else
    120   return PS_ERR;
    121 #endif
    122 }
    123 
    124 /* Set the general registers of LWP LWPID within the target process PH
    125    from GREGSET.  */
    126 
    127 ps_err_e
    128 ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
    129 {
    130   /* Unneeded.  */
    131   return PS_ERR;
    132 }
    133 
    134 /* Get the floating-point registers of LWP LWPID within the target
    135    process PH and store them in FPREGSET.  */
    136 
    137 ps_err_e
    138 ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prfpregset_t *fpregset)
    139 {
    140   /* Unneeded.  */
    141   return PS_ERR;
    142 }
    143 
    144 /* Set the floating-point registers of LWP LWPID within the target
    145    process PH from FPREGSET.  */
    146 
    147 ps_err_e
    148 ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prfpregset_t *fpregset)
    149 {
    150   /* Unneeded.  */
    151   return PS_ERR;
    152 }
    153 
    154 /* Return overall process id of the target PH.  Special for GNU/Linux
    155    -- not used on Solaris.  */
    156 
    157 pid_t
    158 ps_getpid (gdb_ps_prochandle_t ph)
    159 {
    160   return current_process ()->pid;
    161 }
    162