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 /* Helper functions.  */
  38
  39 /* Convert a psaddr_t to a CORE_ADDR.  */
  40
  41 static CORE_ADDR
  42 ps_addr_to_core_addr (psaddr_t addr)
  43 {
  44   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  45     return (intptr_t) addr;
  46   else
  47     return (uintptr_t) addr;
  48 }
  49
  50 /* Convert a CORE_ADDR to a psaddr_t.  */
  51
  52 static psaddr_t
  53 core_addr_to_ps_addr (CORE_ADDR addr)
  54 {
  55   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  56     return (psaddr_t) (intptr_t) addr;
  57   else
  58     return (psaddr_t) (uintptr_t) addr;
  59 }
  60
  61 /* Transfer LEN bytes of memory between BUF and address ADDR in the
  62    process specified by PH.  If WRITE, transfer them to the process,
  63    else transfer them from the process.  Returns PS_OK for success,
  64    PS_ERR on failure.
  65
  66    This is a helper function for ps_pdread and ps_pdwrite.  */
  67
  68 static ps_err_e
  69 ps_xfer_memory (const struct ps_prochandle *ph, psaddr_t addr,
  70                 gdb_byte *buf, size_t len, int write)
  71 {
  72   scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
  73   int ret;
  74   CORE_ADDR core_addr = ps_addr_to_core_addr (addr);
  75
  76   inferior_ptid = ph->ptid;
  77
  78   if (write)
  79     ret = target_write_memory (core_addr, buf, len);
  80   else
  81     ret = target_read_memory (core_addr, buf, len);
  82
  83   return (ret == 0 ? PS_OK : PS_ERR);
  84 }
  85 \f
  86
  87 /* Search for the symbol named NAME within the object named OBJ within
  88    the target process PH.  If the symbol is found the address of the
  89    symbol is stored in SYM_ADDR.  */
  90
  91 ps_err_e
  92 ps_pglobal_lookup (struct ps_prochandle *ph, const char *obj,
  93                    const char *name, psaddr_t *sym_addr)
  94 {
  95   struct inferior *inf = find_inferior_ptid (ph->ptid);
  96
  97   scoped_restore_current_program_space restore_pspace;
  98
  99   set_current_program_space (inf->pspace);
 100
 101   /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */
 102   bound_minimal_symbol ms = lookup_minimal_symbol (name, NULL, NULL);
 103   if (ms.minsym == NULL)
 104     return PS_NOSYM;
 105
 106   *sym_addr = core_addr_to_ps_addr (BMSYMBOL_VALUE_ADDRESS (ms));
 107   return PS_OK;
 108 }
 109
 110 /* Read SIZE bytes from the target process PH at address ADDR and copy
 111    them into BUF.  */
 112
 113 ps_err_e
 114 ps_pdread (struct ps_prochandle *ph, psaddr_t addr, void *buf, size_t size)
 115 {
 116   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 0);
 117 }
 118
 119 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 120
 121 ps_err_e
 122 ps_pdwrite (struct ps_prochandle *ph, psaddr_t addr,
 123             const void *buf, size_t size)
 124 {
 125   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 126 }
 127
 128 /* Get the general registers of LWP LWPID within the target process PH
 129    and store them in GREGSET.  */
 130
 131 ps_err_e
 132 ps_lgetregs (struct ps_prochandle *ph, lwpid_t lwpid, prgregset_t gregset)
 133 {
 134   ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
 135   struct regcache *regcache
 136     = get_thread_arch_regcache (ptid, target_gdbarch ());
 137
 138   target_fetch_registers (regcache, -1);
 139   fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
 140
 141   return PS_OK;
 142 }
 143
 144 /* Set the general registers of LWP LWPID within the target process PH
 145    from GREGSET.  */
 146
 147 ps_err_e
 148 ps_lsetregs (struct ps_prochandle *ph, lwpid_t lwpid, const prgregset_t gregset)
 149 {
 150   ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
 151   struct regcache *regcache
 152     = get_thread_arch_regcache (ptid, target_gdbarch ());
 153
 154   supply_gregset (regcache, (const gdb_gregset_t *) gregset);
 155   target_store_registers (regcache, -1);
 156
 157   return PS_OK;
 158 }
 159
 160 /* Get the floating-point registers of LWP LWPID within the target
 161    process PH and store them in FPREGSET.  */
 162
 163 ps_err_e
 164 ps_lgetfpregs (struct ps_prochandle *ph, lwpid_t lwpid, gdb_prfpregset_t *fpregset)
 165 {
 166   ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
 167   struct regcache *regcache
 168     = get_thread_arch_regcache (ptid, target_gdbarch ());
 169
 170   target_fetch_registers (regcache, -1);
 171   fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
 172
 173   return PS_OK;
 174 }
 175
 176 /* Set the floating-point registers of LWP LWPID within the target
 177    process PH from FPREGSET.  */
 178
 179 ps_err_e
 180 ps_lsetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 181                const gdb_prfpregset_t *fpregset)
 182 {
 183   ptid_t ptid = ptid_build (ptid_get_pid (ph->ptid), lwpid, 0);
 184   struct regcache *regcache
 185     = get_thread_arch_regcache (ptid, target_gdbarch ());
 186
 187   supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
 188   target_store_registers (regcache, -1);
 189
 190   return PS_OK;
 191 }
 192
 193 /* Return overall process id of the target PH.  Special for GNU/Linux
 194    -- not used on Solaris.  */
 195
 196 pid_t
 197 ps_getpid (struct ps_prochandle *ph)
 198 {
 199   return ptid_get_pid (ph->ptid);
 200 }
 201
 202 void
 203 _initialize_proc_service (void)
 204 {
 205   /* This function solely exists to make sure this module is linked
 206      into the final binary.  */
 207 }