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 save_inferior_ptid = make_scoped_restore (&inferior_ptid);
  74   int ret;
  75   CORE_ADDR core_addr = ps_addr_to_core_addr (addr);
  76
  77   inferior_ptid = ph->thread->ptid;
  78
  79   if (write)
  80     ret = target_write_memory (core_addr, buf, len);
  81   else
  82     ret = target_read_memory (core_addr, buf, len);
  83
  84   return (ret == 0 ? PS_OK : PS_ERR);
  85 }
  86 \f
  87
  88 /* Search for the symbol named NAME within the object named OBJ within
  89    the target process PH.  If the symbol is found the address of the
  90    symbol is stored in SYM_ADDR.  */
  91
  92 ps_err_e
  93 ps_pglobal_lookup (struct ps_prochandle *ph, const char *obj,
  94                    const char *name, psaddr_t *sym_addr)
  95 {
  96   inferior *inf = ph->thread->inf;
  97
  98   scoped_restore_current_program_space restore_pspace;
  99
 100   set_current_program_space (inf->pspace);
 101
 102   /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */
 103   bound_minimal_symbol ms = lookup_minimal_symbol (name, NULL, NULL);
 104   if (ms.minsym == NULL)
 105     return PS_NOSYM;
 106
 107   *sym_addr = core_addr_to_ps_addr (BMSYMBOL_VALUE_ADDRESS (ms));
 108   return PS_OK;
 109 }
 110
 111 /* Read SIZE bytes from the target process PH at address ADDR and copy
 112    them into BUF.  */
 113
 114 ps_err_e
 115 ps_pdread (struct ps_prochandle *ph, psaddr_t addr, void *buf, size_t size)
 116 {
 117   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 0);
 118 }
 119
 120 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 121
 122 ps_err_e
 123 ps_pdwrite (struct ps_prochandle *ph, psaddr_t addr,
 124             const void *buf, size_t size)
 125 {
 126   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 127 }
 128
 129 /* Get a regcache for LWPID using its inferior's "main" architecture,
 130    which is the register set libthread_db expects to be using.  In
 131    multi-arch debugging scenarios, the thread's architecture may
 132    differ from the inferior's "main" architecture.  */
 133
 134 static struct regcache *
 135 get_ps_regcache (struct ps_prochandle *ph, lwpid_t lwpid)
 136 {
 137   inferior *inf = ph->thread->inf;
 138   return get_thread_arch_regcache (ptid_t (inf->pid, lwpid), inf->gdbarch);
 139 }
 140
 141 /* Get the general registers of LWP LWPID within the target process PH
 142    and store them in GREGSET.  */
 143
 144 ps_err_e
 145 ps_lgetregs (struct ps_prochandle *ph, lwpid_t lwpid, prgregset_t gregset)
 146 {
 147   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 148
 149   target_fetch_registers (regcache, -1);
 150   fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
 151
 152   return PS_OK;
 153 }
 154
 155 /* Set the general registers of LWP LWPID within the target process PH
 156    from GREGSET.  */
 157
 158 ps_err_e
 159 ps_lsetregs (struct ps_prochandle *ph, lwpid_t lwpid, const prgregset_t gregset)
 160 {
 161   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 162
 163   supply_gregset (regcache, (const gdb_gregset_t *) gregset);
 164   target_store_registers (regcache, -1);
 165
 166   return PS_OK;
 167 }
 168
 169 /* Get the floating-point registers of LWP LWPID within the target
 170    process PH and store them in FPREGSET.  */
 171
 172 ps_err_e
 173 ps_lgetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 174                prfpregset_t *fpregset)
 175 {
 176   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 177
 178   target_fetch_registers (regcache, -1);
 179   fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
 180
 181   return PS_OK;
 182 }
 183
 184 /* Set the floating-point registers of LWP LWPID within the target
 185    process PH from FPREGSET.  */
 186
 187 ps_err_e
 188 ps_lsetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 189                const prfpregset_t *fpregset)
 190 {
 191   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 192
 193   supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
 194   target_store_registers (regcache, -1);
 195
 196   return PS_OK;
 197 }
 198
 199 /* Return overall process id of the target PH.  Special for GNU/Linux
 200    -- not used on Solaris.  */
 201
 202 pid_t
 203 ps_getpid (struct ps_prochandle *ph)
 204 {
 205   return ph->thread->ptid.pid ();
 206 }
 207
 208 void
 209 _initialize_proc_service (void)
 210 {
 211   /* This function solely exists to make sure this module is linked
 212      into the final binary.  */
 213 }