gdb/proc-service.c

   1 /* <proc_service.h> implementation.
   2
   3    Copyright (C) 1999-2023 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_for_memory save_inferior (ph->thread->inf);
  76
  77   CORE_ADDR core_addr = ps_addr_to_core_addr (addr);
  78
  79   int ret;
  80   if (write)
  81     ret = target_write_memory (core_addr, buf, len);
  82   else
  83     ret = target_read_memory (core_addr, buf, len);
  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 (ms.value_address ());
 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 (inf->process_target (),
 139                                    ptid_t (inf->pid, lwpid),
 140                                    inf->arch ());
 141 }
 142
 143 /* Get the general registers of LWP LWPID within the target process PH
 144    and store them in GREGSET.  */
 145
 146 ps_err_e
 147 ps_lgetregs (struct ps_prochandle *ph, lwpid_t lwpid, prgregset_t gregset)
 148 {
 149   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 150
 151   target_fetch_registers (regcache, -1);
 152   fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
 153
 154   return PS_OK;
 155 }
 156
 157 /* Set the general registers of LWP LWPID within the target process PH
 158    from GREGSET.  */
 159
 160 ps_err_e
 161 ps_lsetregs (struct ps_prochandle *ph, lwpid_t lwpid, const prgregset_t gregset)
 162 {
 163   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 164
 165   supply_gregset (regcache, (const gdb_gregset_t *) gregset);
 166   target_store_registers (regcache, -1);
 167
 168   return PS_OK;
 169 }
 170
 171 /* Get the floating-point registers of LWP LWPID within the target
 172    process PH and store them in FPREGSET.  */
 173
 174 ps_err_e
 175 ps_lgetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 176                prfpregset_t *fpregset)
 177 {
 178   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 179
 180   target_fetch_registers (regcache, -1);
 181   fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
 182
 183   return PS_OK;
 184 }
 185
 186 /* Set the floating-point registers of LWP LWPID within the target
 187    process PH from FPREGSET.  */
 188
 189 ps_err_e
 190 ps_lsetfpregs (struct ps_prochandle *ph, lwpid_t lwpid,
 191                const prfpregset_t *fpregset)
 192 {
 193   struct regcache *regcache = get_ps_regcache (ph, lwpid);
 194
 195   supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
 196   target_store_registers (regcache, -1);
 197
 198   return PS_OK;
 199 }
 200
 201 /* Return overall process id of the target PH.  Special for GNU/Linux
 202    -- not used on Solaris.  */
 203
 204 pid_t
 205 ps_getpid (struct ps_prochandle *ph)
 206 {
 207   return ph->thread->ptid.pid ();
 208 }
 209
 210 void _initialize_proc_service ();
 211 void
 212 _initialize_proc_service ()
 213 {
 214   /* This function solely exists to make sure this module is linked
 215      into the final binary.  */
 216 }