gdb/proc-service.c

   1 /* <proc_service.h> implementation.
   2
   3    Copyright (C) 1999-2017 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21
  22 #include "gdbcore.h"
  23 #include "inferior.h"
  24 #include "symtab.h"
  25 #include "target.h"
  26 #include "regcache.h"
  27 #include "objfiles.h"
  28
  29 #include "gdb_proc_service.h"
  30
  31 #include <sys/procfs.h>
  32
  33 /* Prototypes for supply_gregset etc.  */
  34 #include "gregset.h"
  35 \f
  36
  37 /* Fix-up some broken systems.  */
  38
  39 /* The prototypes in <proc_service.h> are slightly different on older
  40    systems.  Compensate for the discrepancies.  */
  41
  42 #ifdef PROC_SERVICE_IS_OLD
  43 typedef const struct ps_prochandle *gdb_ps_prochandle_t;
  44 typedef char *gdb_ps_read_buf_t;
  45 typedef char *gdb_ps_write_buf_t;
  46 typedef int gdb_ps_size_t;
  47 #else
  48 typedef struct ps_prochandle *gdb_ps_prochandle_t;
  49 typedef void *gdb_ps_read_buf_t;
  50 typedef const void *gdb_ps_write_buf_t;
  51 typedef size_t gdb_ps_size_t;
  52 #endif
  53 \f
  54
  55 /* Helper functions.  */
  56
  57 /* Convert a psaddr_t to a CORE_ADDR.  */
  58
  59 static CORE_ADDR
  60 ps_addr_to_core_addr (psaddr_t addr)
  61 {
  62   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  63     return (intptr_t) addr;
  64   else
  65     return (uintptr_t) addr;
  66 }
  67
  68 /* Convert a CORE_ADDR to a psaddr_t.  */
  69
  70 static psaddr_t
  71 core_addr_to_ps_addr (CORE_ADDR addr)
  72 {
  73   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  74     return (psaddr_t) (intptr_t) addr;
  75   else
  76     return (psaddr_t) (uintptr_t) addr;
  77 }
  78
  79 /* Transfer LEN bytes of memory between BUF and address ADDR in the
  80    process specified by PH.  If WRITE, transfer them to the process,
  81    else transfer them from the process.  Returns PS_OK for success,
  82    PS_ERR on failure.
  83
  84    This is a helper function for ps_pdread and ps_pdwrite.  */
  85
  86 static ps_err_e
  87 ps_xfer_memory (const struct ps_prochandle *ph, psaddr_t addr,
  88                 gdb_byte *buf, size_t len, int write)
  89 {
  90   struct cleanup *old_chain = save_inferior_ptid ();
  91   int ret;
  92   CORE_ADDR core_addr = ps_addr_to_core_addr (addr);
  93
  94   inferior_ptid = ph->ptid;
  95
  96   if (write)
  97     ret = target_write_memory (core_addr, buf, len);
  98   else
  99     ret = target_read_memory (core_addr, buf, len);
 100
 101   do_cleanups (old_chain);
 102
 103   return (ret == 0 ? PS_OK : PS_ERR);
 104 }
 105 \f
 106
 107 /* Search for the symbol named NAME within the object named OBJ within
 108    the target process PH.  If the symbol is found the address of the
 109    symbol is stored in SYM_ADDR.  */
 110
 111 ps_err_e
 112 ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *obj,
 113                    const char *name, psaddr_t *sym_addr)
 114 {
 115   struct inferior *inf = find_inferior_ptid (ph->ptid);
 116
 117   scoped_restore_current_program_space restore_pspace;
 118
 119   set_current_program_space (inf->pspace);
 120
 121   /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */
 122   bound_minimal_symbol ms = lookup_minimal_symbol (name, NULL, NULL);
 123   if (ms.minsym == NULL)
 124     return PS_NOSYM;
 125
 126   *sym_addr = core_addr_to_ps_addr (BMSYMBOL_VALUE_ADDRESS (ms));
 127   return PS_OK;
 128 }
 129
 130 /* Read SIZE bytes from the target process PH at address ADDR and copy
 131    them into BUF.  */
 132
 133 ps_err_e
 134 ps_pdread (gdb_ps_prochandle_t ph, psaddr_t addr,
 135            gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 136 {
 137   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 0);
 138 }
 139
 140 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 141
 142 ps_err_e
 143 ps_pdwrite (gdb_ps_prochandle_t ph, psaddr_t addr,
 144             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
 145 {
 146   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 147 }
 148
 149 /* Get the general registers of LWP LWPID within the target process PH
 150    and store them in GREGSET.  */
 151
 152 ps_err_e
 153 ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
 154 {
 155   ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
 156   struct regcache *regcache
 157     = get_thread_arch_regcache (ptid, target_gdbarch ());
 158
 159   target_fetch_registers (regcache, -1);
 160   fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
 161
 162   return PS_OK;
 163 }
 164
 165 /* Set the general registers of LWP LWPID within the target process PH
 166    from GREGSET.  */
 167
 168 ps_err_e
 169 ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
 170 {
 171   ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
 172   struct regcache *regcache
 173     = get_thread_arch_regcache (ptid, target_gdbarch ());
 174
 175   supply_gregset (regcache, (const gdb_gregset_t *) gregset);
 176   target_store_registers (regcache, -1);
 177
 178   return PS_OK;
 179 }
 180
 181 /* Get the floating-point registers of LWP LWPID within the target
 182    process PH and store them in FPREGSET.  */
 183
 184 ps_err_e
 185 ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
 186                gdb_prfpregset_t *fpregset)
 187 {
 188   ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
 189   struct regcache *regcache
 190     = get_thread_arch_regcache (ptid, target_gdbarch ());
 191
 192   target_fetch_registers (regcache, -1);
 193   fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
 194
 195   return PS_OK;
 196 }
 197
 198 /* Set the floating-point registers of LWP LWPID within the target
 199    process PH from FPREGSET.  */
 200
 201 ps_err_e
 202 ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
 203                const gdb_prfpregset_t *fpregset)
 204 {
 205   ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
 206   struct regcache *regcache
 207     = get_thread_arch_regcache (ptid, target_gdbarch ());
 208
 209   supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
 210   target_store_registers (regcache, -1);
 211
 212   return PS_OK;
 213 }
 214
 215 /* Return overall process id of the target PH.  Special for GNU/Linux
 216    -- not used on Solaris.  */
 217
 218 pid_t
 219 ps_getpid (gdb_ps_prochandle_t ph)
 220 {
 221   return ptid_get_pid (ph->ptid);
 222 }
 223
 224 /* Provide a prototype to silence -Wmissing-prototypes.  */
 225 extern initialize_file_ftype _initialize_proc_service;
 226
 227 void
 228 _initialize_proc_service (void)
 229 {
 230   /* This function solely exists to make sure this module is linked
 231      into the final binary.  */
 232 }