gdb/proc-service.c

   1 /* <proc_service.h> implementation.
   2
   3    Copyright (C) 1999-2020 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 "gdbthread.h"
  25 #include "symtab.h"
  26 #include "target.h"
  27 #include "regcache.h"
  28 #include "objfiles.h"
  29
  30 #include "gdb_proc_service.h"
  31
  32 #include <sys/procfs.h>
  33
  34 /* Prototypes for supply_gregset etc.  */
  35 #include "gregset.h"
  36 \f
  37
  38 /* Helper functions.  */
  39
  40 /* Convert a psaddr_t to a CORE_ADDR.  */
  41
  42 static CORE_ADDR
  43 ps_addr_to_core_addr (psaddr_t addr)
  44 {
  45   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  46     return (intptr_t) addr;
  47   else
  48     return (uintptr_t) addr;
  49 }
  50
  51 /* Convert a CORE_ADDR to a psaddr_t.  */
  52
  53 static psaddr_t
  54 core_addr_to_ps_addr (CORE_ADDR addr)
  55 {
  56   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  57     return (psaddr_t) (intptr_t) addr;
  58   else
  59     return (psaddr_t) (uintptr_t) addr;
  60 }
  61
  62 /* Transfer LEN bytes of memory between BUF and address ADDR in the
  63    process specified by PH.  If WRITE, transfer them to the process,
  64    else transfer them from the process.  Returns PS_OK for success,
  65    PS_ERR on failure.
  66
  67    This is a helper function for ps_pdread and ps_pdwrite.  */
  68
  69 static ps_err_e
  70 ps_xfer_memory (const struct ps_prochandle *ph, psaddr_t addr,
  71                 gdb_byte *buf, size_t len, int write)
  72 {
  73   scoped_restore_current_inferior restore_inferior;
  74   set_current_inferior (ph->thread->inf);
  75
  76   scoped_restore_current_program_space restore_current_progspace;
  77   set_current_program_space (ph->thread->inf->pspace);
  78
  79   scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
  80   inferior_ptid = ph->thread->ptid;
  81
  82   CORE_ADDR core_addr = ps_addr_to_core_addr (addr);
  83
  84   int ret;
  85   if (write)
  86     ret = target_write_memory (core_addr, buf, len);
  87   else
  88     ret = target_read_memory (core_addr, buf, len);
  89   return (ret == 0 ? PS_OK : PS_ERR);
  90 }
  91 \f
  92
  93 /* Search for the symbol named NAME within the object named OBJ within
  94    the target process PH.  If the symbol is found the address of the
  95    symbol is stored in SYM_ADDR.  */
  96
  97 ps_err_e
  98 ps_pglobal_lookup (struct ps_prochandle *ph, const char *obj,
  99                    const char *name, psaddr_t *sym_addr)
 100 {
 101   inferior *inf = ph->thread->inf;
 102
 103   scoped_restore_current_program_space restore_pspace;
 104
 105   set_current_program_space (inf->pspace);
 106
 107   /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */
 108   bound_minimal_symbol ms = lookup_minimal_symbol (name, NULL, NULL);
 109   if (ms.minsym == NULL)
 110     return PS_NOSYM;
 111
 112   *sym_addr = core_addr_to_ps_addr (BMSYMBOL_VALUE_ADDRESS (ms));
 113   return PS_OK;
 114 }
 115
 116 /* Read SIZE bytes from the target process PH at address ADDR and copy
 117    them into BUF.  */
 118
 119 ps_err_e
 120 ps_pdread (struct ps_prochandle *ph, psaddr_t addr, void *buf, size_t size)
 121 {
 122   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 0);
 123 }
 124
 125 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 126
 127 ps_err_e
 128 ps_pdwrite (struct ps_prochandle *ph, psaddr_t addr,
 129             const void *buf, size_t size)
 130 {
 131   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 132 }
 133
 134 /* Get a regcache for LWPID using its inferior's "main" architecture,
 135    which is the register set libthread_db expects to be using.  In
 136    multi-arch debugging scenarios, the thread's architecture may
 137    differ from the inferior's "main" architecture.  */
 138
 139 static struct regcache *
 140 get_ps_regcache (struct ps_prochandle *ph, lwpid_t lwpid)
 141 {
 142   inferior *inf = ph->thread->inf;
 143   return get_thread_arch_regcache (inf->process_target (),
 144                                    ptid_t (inf->pid, lwpid),
 145                                    inf->gdbarch);
 146 }
 147
 148 /* Get the general registers of LWP LWPID within the target process PH
 149    and store them in GREGSET.  */
 150
 151 ps_err_e
 152 ps_lgetregs (struct ps_prochandle *ph, lwpid_t lwpid, prgregset_t gregset)
 153 {
 154   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 155
 156   target_fetch_registers (regcache, -1);
 157   fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
 158
 159   return PS_OK;
 160 }
 161
 162 /* Set the general registers of LWP LWPID within the target process PH
 163    from GREGSET.  */
 164
 165 ps_err_e
 166 ps_lsetregs (struct ps_prochandle *ph, lwpid_t lwpid, const prgregset_t gregset)
 167 {
 168   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 169
 170   supply_gregset (regcache, (const gdb_gregset_t *) gregset);
 171   target_store_registers (regcache, -1);
 172
 173   return PS_OK;
 174 }
 175
 176 /* Get the floating-point registers of LWP LWPID within the target
 177    process PH and store them in FPREGSET.  */
 178
 179 ps_err_e
 180 ps_lgetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 181                prfpregset_t *fpregset)
 182 {
 183   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 184
 185   target_fetch_registers (regcache, -1);
 186   fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
 187
 188   return PS_OK;
 189 }
 190
 191 /* Set the floating-point registers of LWP LWPID within the target
 192    process PH from FPREGSET.  */
 193
 194 ps_err_e
 195 ps_lsetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 196                const prfpregset_t *fpregset)
 197 {
 198   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 199
 200   supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
 201   target_store_registers (regcache, -1);
 202
 203   return PS_OK;
 204 }
 205
 206 /* Return overall process id of the target PH.  Special for GNU/Linux
 207    -- not used on Solaris.  */
 208
 209 pid_t
 210 ps_getpid (struct ps_prochandle *ph)
 211 {
 212   return ph->thread->ptid.pid ();
 213 }
 214
 215 void
 216 _initialize_proc_service (void)
 217 {
 218   /* This function solely exists to make sure this module is linked
 219      into the final binary.  */
 220 }