gdb/proc-service.c

   1 /* <proc_service.h> implementation.
   2
   3    Copyright (C) 1999-2021 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 (current_program_space->exec_bfd ()
  46       && bfd_get_sign_extend_vma (current_program_space->exec_bfd ()))
  47     return (intptr_t) addr;
  48   else
  49     return (uintptr_t) addr;
  50 }
  51
  52 /* Convert a CORE_ADDR to a psaddr_t.  */
  53
  54 static psaddr_t
  55 core_addr_to_ps_addr (CORE_ADDR addr)
  56 {
  57   if (current_program_space->exec_bfd ()
  58       && bfd_get_sign_extend_vma (current_program_space->exec_bfd ()))
  59     return (psaddr_t) (intptr_t) addr;
  60   else
  61     return (psaddr_t) (uintptr_t) addr;
  62 }
  63
  64 /* Transfer LEN bytes of memory between BUF and address ADDR in the
  65    process specified by PH.  If WRITE, transfer them to the process,
  66    else transfer them from the process.  Returns PS_OK for success,
  67    PS_ERR on failure.
  68
  69    This is a helper function for ps_pdread and ps_pdwrite.  */
  70
  71 static ps_err_e
  72 ps_xfer_memory (const struct ps_prochandle *ph, psaddr_t addr,
  73                 gdb_byte *buf, size_t len, int write)
  74 {
  75   scoped_restore_current_inferior restore_inferior;
  76   set_current_inferior (ph->thread->inf);
  77
  78   scoped_restore_current_program_space restore_current_progspace;
  79   set_current_program_space (ph->thread->inf->pspace);
  80
  81   scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
  82   inferior_ptid = ph->thread->ptid;
  83
  84   CORE_ADDR core_addr = ps_addr_to_core_addr (addr);
  85
  86   int ret;
  87   if (write)
  88     ret = target_write_memory (core_addr, buf, len);
  89   else
  90     ret = target_read_memory (core_addr, buf, len);
  91   return (ret == 0 ? PS_OK : PS_ERR);
  92 }
  93 \f
  94
  95 /* Search for the symbol named NAME within the object named OBJ within
  96    the target process PH.  If the symbol is found the address of the
  97    symbol is stored in SYM_ADDR.  */
  98
  99 ps_err_e
 100 ps_pglobal_lookup (struct ps_prochandle *ph, const char *obj,
 101                    const char *name, psaddr_t *sym_addr)
 102 {
 103   inferior *inf = ph->thread->inf;
 104
 105   scoped_restore_current_program_space restore_pspace;
 106
 107   set_current_program_space (inf->pspace);
 108
 109   /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */
 110   bound_minimal_symbol ms = lookup_minimal_symbol (name, NULL, NULL);
 111   if (ms.minsym == NULL)
 112     return PS_NOSYM;
 113
 114   *sym_addr = core_addr_to_ps_addr (BMSYMBOL_VALUE_ADDRESS (ms));
 115   return PS_OK;
 116 }
 117
 118 /* Read SIZE bytes from the target process PH at address ADDR and copy
 119    them into BUF.  */
 120
 121 ps_err_e
 122 ps_pdread (struct ps_prochandle *ph, psaddr_t addr, void *buf, size_t size)
 123 {
 124   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 0);
 125 }
 126
 127 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 128
 129 ps_err_e
 130 ps_pdwrite (struct ps_prochandle *ph, psaddr_t addr,
 131             const void *buf, size_t size)
 132 {
 133   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 134 }
 135
 136 /* Get a regcache for LWPID using its inferior's "main" architecture,
 137    which is the register set libthread_db expects to be using.  In
 138    multi-arch debugging scenarios, the thread's architecture may
 139    differ from the inferior's "main" architecture.  */
 140
 141 static struct regcache *
 142 get_ps_regcache (struct ps_prochandle *ph, lwpid_t lwpid)
 143 {
 144   inferior *inf = ph->thread->inf;
 145   return get_thread_arch_regcache (inf->process_target (),
 146                                    ptid_t (inf->pid, lwpid),
 147                                    inf->gdbarch);
 148 }
 149
 150 /* Get the general registers of LWP LWPID within the target process PH
 151    and store them in GREGSET.  */
 152
 153 ps_err_e
 154 ps_lgetregs (struct ps_prochandle *ph, lwpid_t lwpid, prgregset_t gregset)
 155 {
 156   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 157
 158   target_fetch_registers (regcache, -1);
 159   fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
 160
 161   return PS_OK;
 162 }
 163
 164 /* Set the general registers of LWP LWPID within the target process PH
 165    from GREGSET.  */
 166
 167 ps_err_e
 168 ps_lsetregs (struct ps_prochandle *ph, lwpid_t lwpid, const prgregset_t gregset)
 169 {
 170   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 171
 172   supply_gregset (regcache, (const gdb_gregset_t *) gregset);
 173   target_store_registers (regcache, -1);
 174
 175   return PS_OK;
 176 }
 177
 178 /* Get the floating-point registers of LWP LWPID within the target
 179    process PH and store them in FPREGSET.  */
 180
 181 ps_err_e
 182 ps_lgetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 183                prfpregset_t *fpregset)
 184 {
 185   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 186
 187   target_fetch_registers (regcache, -1);
 188   fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
 189
 190   return PS_OK;
 191 }
 192
 193 /* Set the floating-point registers of LWP LWPID within the target
 194    process PH from FPREGSET.  */
 195
 196 ps_err_e
 197 ps_lsetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 198                const prfpregset_t *fpregset)
 199 {
 200   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 201
 202   supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
 203   target_store_registers (regcache, -1);
 204
 205   return PS_OK;
 206 }
 207
 208 /* Return overall process id of the target PH.  Special for GNU/Linux
 209    -- not used on Solaris.  */
 210
 211 pid_t
 212 ps_getpid (struct ps_prochandle *ph)
 213 {
 214   return ph->thread->ptid.pid ();
 215 }
 216
 217 void _initialize_proc_service ();
 218 void
 219 _initialize_proc_service ()
 220 {
 221   /* This function solely exists to make sure this module is linked
 222      into the final binary.  */
 223 }