gdb/proc-service.c

   1 /* <proc_service.h> implementation.
   2
   3    Copyright (C) 1999, 2000, 2002, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22
  23 #include "gdbcore.h"
  24 #include "inferior.h"
  25 #include "symtab.h"
  26 #include "target.h"
  27 #include "regcache.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 /* Fix-up some broken systems.  */
  38
  39 /* The prototypes in <proc_service.h> are slightly different on older
  40    systems.  Compensate for the discrepancies.  */
  41
  42 #ifdef PROC_SERVICE_IS_OLD
  43 typedef const struct ps_prochandle *gdb_ps_prochandle_t;
  44 typedef char *gdb_ps_read_buf_t;
  45 typedef char *gdb_ps_write_buf_t;
  46 typedef int gdb_ps_size_t;
  47 #else
  48 typedef struct ps_prochandle *gdb_ps_prochandle_t;
  49 typedef void *gdb_ps_read_buf_t;
  50 typedef const void *gdb_ps_write_buf_t;
  51 typedef size_t gdb_ps_size_t;
  52 #endif
  53 \f
  54
  55 /* Building process ids.  */
  56
  57 #define BUILD_LWP(lwp, pid)     ptid_build (pid, lwp, 0)
  58 \f
  59
  60 /* Helper functions.  */
  61
  62 /* Convert a psaddr_t to a CORE_ADDR.  */
  63
  64 static CORE_ADDR
  65 ps_addr_to_core_addr (psaddr_t addr)
  66 {
  67   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  68     return (intptr_t) addr;
  69   else
  70     return (uintptr_t) addr;
  71 }
  72
  73 /* Convert a CORE_ADDR to a psaddr_t.  */
  74
  75 static psaddr_t
  76 core_addr_to_ps_addr (CORE_ADDR addr)
  77 {
  78   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  79     return (psaddr_t) (intptr_t) addr;
  80   else
  81     return (psaddr_t) (uintptr_t) addr;
  82 }
  83
  84 /* Transfer LEN bytes of memory between BUF and address ADDR in the
  85    process specified by PH.  If WRITE, transfer them to the process,
  86    else transfer them from the process.  Returns PS_OK for success,
  87    PS_ERR on failure.
  88
  89    This is a helper function for ps_pdread, ps_pdwrite, ps_ptread and
  90    ps_ptwrite.  */
  91
  92 static ps_err_e
  93 ps_xfer_memory (const struct ps_prochandle *ph, psaddr_t addr,
  94                 gdb_byte *buf, size_t len, int write)
  95 {
  96   struct cleanup *old_chain = save_inferior_ptid ();
  97   int ret;
  98   CORE_ADDR core_addr = ps_addr_to_core_addr (addr);
  99
 100   inferior_ptid = ph->ptid;
 101
 102   if (write)
 103     ret = target_write_memory (core_addr, buf, len);
 104   else
 105     ret = target_read_memory (core_addr, buf, len);
 106
 107   do_cleanups (old_chain);
 108
 109   return (ret == 0 ? PS_OK : PS_ERR);
 110 }
 111 \f
 112
 113 /* Stop the target process PH.  */
 114
 115 ps_err_e
 116 ps_pstop (gdb_ps_prochandle_t ph)
 117 {
 118   /* The process is always stopped when under control of GDB.  */
 119   return PS_OK;
 120 }
 121
 122 /* Resume the target process PH.  */
 123
 124 ps_err_e
 125 ps_pcontinue (gdb_ps_prochandle_t ph)
 126 {
 127   /* Pretend we did successfully continue the process.  GDB will take
 128      care of it later on.  */
 129   return PS_OK;
 130 }
 131
 132 /* Stop the lightweight process LWPID within the target process PH.  */
 133
 134 ps_err_e
 135 ps_lstop (gdb_ps_prochandle_t ph, lwpid_t lwpid)
 136 {
 137   /* All lightweight processes are stopped when under control of GDB.  */
 138   return PS_OK;
 139 }
 140
 141 /* Resume the lightweight process (LWP) LWPID within the target
 142    process PH.  */
 143
 144 ps_err_e
 145 ps_lcontinue (gdb_ps_prochandle_t ph, lwpid_t lwpid)
 146 {
 147   /* Pretend we did successfully continue LWPID.  GDB will take care
 148      of it later on.  */
 149   return PS_OK;
 150 }
 151
 152 /* Get the size of the architecture-dependent extra state registers
 153    for LWP LWPID within the target process PH and return it in
 154    *XREGSIZE.  */
 155
 156 ps_err_e
 157 ps_lgetxregsize (gdb_ps_prochandle_t ph, lwpid_t lwpid, int *xregsize)
 158 {
 159   /* FIXME: Not supported yet.  */
 160   return PS_OK;
 161 }
 162
 163 /* Get the extra state registers of LWP LWPID within the target
 164    process PH and store them in XREGSET.  */
 165
 166 ps_err_e
 167 ps_lgetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
 168 {
 169   /* FIXME: Not supported yet.  */
 170   return PS_OK;
 171 }
 172
 173 /* Set the extra state registers of LWP LWPID within the target
 174    process PH from XREGSET.  */
 175
 176 ps_err_e
 177 ps_lsetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
 178 {
 179   /* FIXME: Not supported yet.  */
 180   return PS_OK;
 181 }
 182
 183 /* Log (additional) diognostic information.  */
 184
 185 void
 186 ps_plog (const char *fmt, ...)
 187 {
 188   va_list args;
 189
 190   va_start (args, fmt);
 191   vfprintf_filtered (gdb_stderr, fmt, args);
 192   va_end (args);
 193 }
 194
 195 /* Search for the symbol named NAME within the object named OBJ within
 196    the target process PH.  If the symbol is found the address of the
 197    symbol is stored in SYM_ADDR.  */
 198
 199 ps_err_e
 200 ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *obj,
 201                    const char *name, psaddr_t *sym_addr)
 202 {
 203   struct minimal_symbol *ms;
 204
 205   /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */
 206   ms = lookup_minimal_symbol (name, NULL, NULL);
 207   if (ms == NULL)
 208     return PS_NOSYM;
 209
 210   *sym_addr = core_addr_to_ps_addr (SYMBOL_VALUE_ADDRESS (ms));
 211   return PS_OK;
 212 }
 213
 214 /* Read SIZE bytes from the target process PH at address ADDR and copy
 215    them into BUF.  */
 216
 217 ps_err_e
 218 ps_pdread (gdb_ps_prochandle_t ph, psaddr_t addr,
 219            gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 220 {
 221   return ps_xfer_memory (ph, addr, buf, size, 0);
 222 }
 223
 224 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 225
 226 ps_err_e
 227 ps_pdwrite (gdb_ps_prochandle_t ph, psaddr_t addr,
 228             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
 229 {
 230   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 231 }
 232
 233 /* Read SIZE bytes from the target process PH at address ADDR and copy
 234    them into BUF.  */
 235
 236 ps_err_e
 237 ps_ptread (gdb_ps_prochandle_t ph, psaddr_t addr,
 238            gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 239 {
 240   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 0);
 241 }
 242
 243 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 244
 245 ps_err_e
 246 ps_ptwrite (gdb_ps_prochandle_t ph, psaddr_t addr,
 247             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
 248 {
 249   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 250 }
 251
 252 /* Get the general registers of LWP LWPID within the target process PH
 253    and store them in GREGSET.  */
 254
 255 ps_err_e
 256 ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
 257 {
 258   struct cleanup *old_chain = save_inferior_ptid ();
 259   struct regcache *regcache;
 260
 261   inferior_ptid = BUILD_LWP (lwpid, ptid_get_pid (ph->ptid));
 262   regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch);
 263
 264   target_fetch_registers (regcache, -1);
 265   fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
 266
 267   do_cleanups (old_chain);
 268   return PS_OK;
 269 }
 270
 271 /* Set the general registers of LWP LWPID within the target process PH
 272    from GREGSET.  */
 273
 274 ps_err_e
 275 ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
 276 {
 277   struct cleanup *old_chain = save_inferior_ptid ();
 278   struct regcache *regcache;
 279
 280   inferior_ptid = BUILD_LWP (lwpid, ptid_get_pid (ph->ptid));
 281   regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch);
 282
 283   supply_gregset (regcache, (const gdb_gregset_t *) gregset);
 284   target_store_registers (regcache, -1);
 285
 286   do_cleanups (old_chain);
 287   return PS_OK;
 288 }
 289
 290 /* Get the floating-point registers of LWP LWPID within the target
 291    process PH and store them in FPREGSET.  */
 292
 293 ps_err_e
 294 ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
 295                gdb_prfpregset_t *fpregset)
 296 {
 297   struct cleanup *old_chain = save_inferior_ptid ();
 298   struct regcache *regcache;
 299
 300   inferior_ptid = BUILD_LWP (lwpid, ptid_get_pid (ph->ptid));
 301   regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch);
 302
 303   target_fetch_registers (regcache, -1);
 304   fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
 305
 306   do_cleanups (old_chain);
 307   return PS_OK;
 308 }
 309
 310 /* Set the floating-point registers of LWP LWPID within the target
 311    process PH from FPREGSET.  */
 312
 313 ps_err_e
 314 ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
 315                const gdb_prfpregset_t *fpregset)
 316 {
 317   struct cleanup *old_chain = save_inferior_ptid ();
 318   struct regcache *regcache;
 319
 320   inferior_ptid = BUILD_LWP (lwpid, ptid_get_pid (ph->ptid));
 321   regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch);
 322
 323   supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
 324   target_store_registers (regcache, -1);
 325
 326   do_cleanups (old_chain);
 327   return PS_OK;
 328 }
 329
 330 /* Return overall process id of the target PH.  Special for GNU/Linux
 331    -- not used on Solaris.  */
 332
 333 pid_t
 334 ps_getpid (gdb_ps_prochandle_t ph)
 335 {
 336   return ptid_get_pid (ph->ptid);
 337 }
 338
 339 /* Provide a prototype to silence -Wmissing-prototypes.  */
 340 extern initialize_file_ftype _initialize_proc_service;
 341
 342 void
 343 _initialize_proc_service (void)
 344 {
 345   /* This function solely exists to make sure this module is linked
 346      into the final binary.  */
 347 }