gdb/proc-service.c

   1 /* <proc_service.h> implementation.
   2    Copyright 1999, 2000 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22
  23 #include "gdb_proc_service.h"
  24 #include <sys/procfs.h>
  25
  26 #include "inferior.h"
  27 #include "symtab.h"
  28 #include "target.h"
  29
  30 /* Prototypes for supply_gregset etc.  */
  31 #include "gregset.h"
  32 \f
  33
  34 /* Fix-up some broken systems.  */
  35
  36 /* The prototypes in <proc_service.h> are slightly different on older
  37    systems.  Compensate for the discrepancies.  */
  38
  39 #ifdef PROC_SERVICE_IS_OLD
  40 typedef const struct ps_prochandle *gdb_ps_prochandle_t;
  41 typedef char *gdb_ps_read_buf_t;
  42 typedef char *gdb_ps_write_buf_t;
  43 typedef int gdb_ps_size_t;
  44 #else
  45 typedef struct ps_prochandle *gdb_ps_prochandle_t;
  46 typedef void *gdb_ps_read_buf_t;
  47 typedef const void *gdb_ps_write_buf_t;
  48 typedef size_t gdb_ps_size_t;
  49 #endif
  50 \f
  51
  52 /* Building process ids.  */
  53
  54 #ifndef MERGEPID
  55 #define MERGEPID(PID, TID)      (((PID) & 0xffff) | ((TID) << 16))
  56 #endif
  57
  58 #define BUILD_LWP(tid, pid)     MERGEPID (pid, tid)
  59 \f
  60
  61 /* Helper functions.  */
  62
  63 static void
  64 restore_inferior_pid (void *arg)
  65 {
  66   int *saved_pid_ptr = arg;
  67   inferior_pid = *saved_pid_ptr;
  68   xfree (arg);
  69 }
  70
  71 static struct cleanup *
  72 save_inferior_pid (void)
  73 {
  74   int *saved_pid_ptr;
  75
  76   saved_pid_ptr = xmalloc (sizeof (int));
  77   *saved_pid_ptr = inferior_pid;
  78   return make_cleanup (restore_inferior_pid, saved_pid_ptr);
  79 }
  80
  81 /* Transfer LEN bytes of memory between BUF and address ADDR in the
  82    process specified by PH.  If WRITE, transfer them to the process,
  83    else transfer them from the process.  Returns PS_OK for success,
  84    PS_ERR on failure.
  85
  86    This is a helper function for ps_pdread, ps_pdwrite, ps_ptread and
  87    ps_ptwrite.  */
  88
  89 static ps_err_e
  90 ps_xfer_memory (const struct ps_prochandle *ph, paddr_t addr,
  91                 char *buf, size_t len, int write)
  92 {
  93   struct cleanup *old_chain = save_inferior_pid ();
  94   int ret;
  95
  96   inferior_pid = ph->pid;
  97
  98   if (write)
  99     ret = target_write_memory (addr, buf, len);
 100   else
 101     ret = target_read_memory (addr, buf, len);
 102
 103   do_cleanups (old_chain);
 104
 105   return (ret == 0 ? PS_OK : PS_ERR);
 106 }
 107 \f
 108
 109 /* Stop the target process PH.  */
 110
 111 ps_err_e
 112 ps_pstop (gdb_ps_prochandle_t ph)
 113 {
 114   /* The process is always stopped when under control of GDB.  */
 115   return PS_OK;
 116 }
 117
 118 /* Resume the target process PH.  */
 119
 120 ps_err_e
 121 ps_pcontinue (gdb_ps_prochandle_t ph)
 122 {
 123   /* Pretend we did successfully continue the process.  GDB will take
 124      care of it later on.  */
 125   return PS_OK;
 126 }
 127
 128 /* Stop the lightweight process LWPID within the target process PH.  */
 129
 130 ps_err_e
 131 ps_lstop (gdb_ps_prochandle_t ph, lwpid_t lwpid)
 132 {
 133   /* All lightweight processes are stopped when under control of GDB.  */
 134   return PS_OK;
 135 }
 136
 137 /* Resume the lightweight process (LWP) LWPID within the target
 138    process PH.  */
 139
 140 ps_err_e
 141 ps_lcontinue (gdb_ps_prochandle_t ph, lwpid_t lwpid)
 142 {
 143   /* Pretend we did successfully continue LWPID.  GDB will take care
 144      of it later on.  */
 145   return PS_OK;
 146 }
 147
 148 /* Get the size of the architecture-dependent extra state registers
 149    for LWP LWPID within the target process PH and return it in
 150    *XREGSIZE.  */
 151
 152 ps_err_e
 153 ps_lgetxregsize (gdb_ps_prochandle_t ph, lwpid_t lwpid, int *xregsize)
 154 {
 155   /* FIXME: Not supported yet.  */
 156   return PS_OK;
 157 }
 158
 159 /* Get the extra state registers of LWP LWPID within the target
 160    process PH and store them in XREGSET.  */
 161
 162 ps_err_e
 163 ps_lgetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
 164 {
 165   /* FIXME: Not supported yet.  */
 166   return PS_OK;
 167 }
 168
 169 /* Set the extra state registers of LWP LWPID within the target
 170    process PH from XREGSET.  */
 171
 172 ps_err_e
 173 ps_lsetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
 174 {
 175   /* FIXME: Not supported yet.  */
 176   return PS_OK;
 177 }
 178
 179 /* Log (additional) diognostic information.  */
 180
 181 void
 182 ps_plog (const char *fmt, ...)
 183 {
 184   va_list args;
 185
 186   va_start (args, fmt);
 187   vfprintf_filtered (gdb_stderr, fmt, args);
 188 }
 189
 190 /* Search for the symbol named NAME within the object named OBJ within
 191    the target process PH.  If the symbol is found the address of the
 192    symbol is stored in SYM_ADDR.  */
 193
 194 ps_err_e
 195 ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *obj,
 196                    const char *name, paddr_t *sym_addr)
 197 {
 198   struct minimal_symbol *ms;
 199
 200   /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */
 201   ms = lookup_minimal_symbol (name, NULL, NULL);
 202   if (ms == NULL)
 203     return PS_NOSYM;
 204
 205   *sym_addr = SYMBOL_VALUE_ADDRESS (ms);
 206   return PS_OK;
 207 }
 208
 209 /* Read SIZE bytes from the target process PH at address ADDR and copy
 210    them into BUF.  */
 211
 212 ps_err_e
 213 ps_pdread (gdb_ps_prochandle_t ph, paddr_t addr,
 214            gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 215 {
 216   return ps_xfer_memory (ph, addr, buf, size, 0);
 217 }
 218
 219 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 220
 221 ps_err_e
 222 ps_pdwrite (gdb_ps_prochandle_t ph, paddr_t addr,
 223             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
 224 {
 225   return ps_xfer_memory (ph, addr, (char *) buf, size, 1);
 226 }
 227
 228 /* Read SIZE bytes from the target process PH at address ADDR and copy
 229    them into BUF.  */
 230
 231 ps_err_e
 232 ps_ptread (gdb_ps_prochandle_t ph, paddr_t addr,
 233            gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 234 {
 235   return ps_xfer_memory (ph, addr, buf, size, 0);
 236 }
 237
 238 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 239
 240 ps_err_e
 241 ps_ptwrite (gdb_ps_prochandle_t ph, paddr_t addr,
 242             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
 243 {
 244   return ps_xfer_memory (ph, addr, (char *) buf, size, 1);
 245 }
 246
 247 /* Get the general registers of LWP LWPID within the target process PH
 248    and store them in GREGSET.  */
 249
 250 ps_err_e
 251 ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
 252 {
 253   struct cleanup *old_chain = save_inferior_pid ();
 254
 255   inferior_pid = BUILD_LWP (lwpid, ph->pid);
 256
 257   target_fetch_registers (-1);
 258   fill_gregset ((gdb_gregset_t *) gregset, -1);
 259
 260   do_cleanups (old_chain);
 261   return PS_OK;
 262 }
 263
 264 /* Set the general registers of LWP LWPID within the target process PH
 265    from GREGSET.  */
 266
 267 ps_err_e
 268 ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
 269 {
 270   struct cleanup *old_chain = save_inferior_pid ();
 271
 272   inferior_pid = BUILD_LWP (lwpid, ph->pid);
 273
 274   /* FIXME: We should really make supply_gregset const-correct.  */
 275   supply_gregset ((gdb_gregset_t *) gregset);
 276   target_store_registers (-1);
 277
 278   do_cleanups (old_chain);
 279   return PS_OK;
 280 }
 281
 282 /* Get the floating-point registers of LWP LWPID within the target
 283    process PH and store them in FPREGSET.  */
 284
 285 ps_err_e
 286 ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
 287                gdb_prfpregset_t *fpregset)
 288 {
 289   struct cleanup *old_chain = save_inferior_pid ();
 290
 291   inferior_pid = BUILD_LWP (lwpid, ph->pid);
 292
 293   target_fetch_registers (-1);
 294   fill_fpregset ((gdb_fpregset_t *) fpregset, -1);
 295
 296   do_cleanups (old_chain);
 297   return PS_OK;
 298 }
 299
 300 /* Set the floating-point registers of LWP LWPID within the target
 301    process PH from FPREGSET.  */
 302
 303 ps_err_e
 304 ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
 305                const gdb_prfpregset_t *fpregset)
 306 {
 307   struct cleanup *old_chain = save_inferior_pid ();
 308
 309   inferior_pid = BUILD_LWP (lwpid, ph->pid);
 310
 311   /* FIXME: We should really make supply_fpregset const-correct.  */
 312   supply_fpregset ((gdb_fpregset_t *) fpregset);
 313   target_store_registers (-1);
 314
 315   do_cleanups (old_chain);
 316   return PS_OK;
 317 }
 318
 319 /* Return overall process id of the target PH.
 320    Special for Linux -- not used on Solaris.  */
 321
 322 pid_t
 323 ps_getpid (gdb_ps_prochandle_t ph)
 324 {
 325   return ph->pid;
 326 }
 327
 328 void
 329 _initialize_proc_service (void)
 330 {
 331   /* This function solely exists to make sure this module is linked
 332      into the final binary.  */
 333 }