gdb/proc-service.c

   1 /* <proc_service.h> implementation.
   2
   3    Copyright (C) 1999, 2000, 2002, 2007, 2008 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 "symtab.h"
  25 #include "target.h"
  26 #include "regcache.h"
  27
  28 #include "gdb_proc_service.h"
  29
  30 #include <sys/procfs.h>
  31
  32 /* Prototypes for supply_gregset etc.  */
  33 #include "gregset.h"
  34 \f
  35
  36 /* Fix-up some broken systems.  */
  37
  38 /* The prototypes in <proc_service.h> are slightly different on older
  39    systems.  Compensate for the discrepancies.  */
  40
  41 #ifdef PROC_SERVICE_IS_OLD
  42 typedef const struct ps_prochandle *gdb_ps_prochandle_t;
  43 typedef char *gdb_ps_read_buf_t;
  44 typedef char *gdb_ps_write_buf_t;
  45 typedef int gdb_ps_size_t;
  46 #else
  47 typedef struct ps_prochandle *gdb_ps_prochandle_t;
  48 typedef void *gdb_ps_read_buf_t;
  49 typedef const void *gdb_ps_write_buf_t;
  50 typedef size_t gdb_ps_size_t;
  51 #endif
  52 \f
  53
  54 /* Building process ids.  */
  55
  56 #define BUILD_LWP(lwp, pid)     ptid_build (pid, lwp, 0)
  57 \f
  58
  59 /* Helper functions.  */
  60
  61 /* Convert a psaddr_t to a CORE_ADDR.  */
  62
  63 static CORE_ADDR
  64 ps_addr_to_core_addr (psaddr_t addr)
  65 {
  66   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  67     return (intptr_t) addr;
  68   else
  69     return (uintptr_t) addr;
  70 }
  71
  72 /* Convert a CORE_ADDR to a psaddr_t.  */
  73
  74 static psaddr_t
  75 core_addr_to_ps_addr (CORE_ADDR addr)
  76 {
  77   if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))
  78     return (psaddr_t) (intptr_t) addr;
  79   else
  80     return (psaddr_t) (uintptr_t) addr;
  81 }
  82
  83 /* Transfer LEN bytes of memory between BUF and address ADDR in the
  84    process specified by PH.  If WRITE, transfer them to the process,
  85    else transfer them from the process.  Returns PS_OK for success,
  86    PS_ERR on failure.
  87
  88    This is a helper function for ps_pdread, ps_pdwrite, ps_ptread and
  89    ps_ptwrite.  */
  90
  91 static ps_err_e
  92 ps_xfer_memory (const struct ps_prochandle *ph, psaddr_t addr,
  93                 gdb_byte *buf, size_t len, int write)
  94 {
  95   struct cleanup *old_chain = save_inferior_ptid ();
  96   int ret;
  97   CORE_ADDR core_addr = ps_addr_to_core_addr (addr);
  98
  99   inferior_ptid = pid_to_ptid (ph->pid);
 100
 101   if (write)
 102     ret = target_write_memory (core_addr, buf, len);
 103   else
 104     ret = target_read_memory (core_addr, buf, len);
 105
 106   do_cleanups (old_chain);
 107
 108   return (ret == 0 ? PS_OK : PS_ERR);
 109 }
 110 \f
 111
 112 /* Stop the target process PH.  */
 113
 114 ps_err_e
 115 ps_pstop (gdb_ps_prochandle_t ph)
 116 {
 117   /* The process is always stopped when under control of GDB.  */
 118   return PS_OK;
 119 }
 120
 121 /* Resume the target process PH.  */
 122
 123 ps_err_e
 124 ps_pcontinue (gdb_ps_prochandle_t ph)
 125 {
 126   /* Pretend we did successfully continue the process.  GDB will take
 127      care of it later on.  */
 128   return PS_OK;
 129 }
 130
 131 /* Stop the lightweight process LWPID within the target process PH.  */
 132
 133 ps_err_e
 134 ps_lstop (gdb_ps_prochandle_t ph, lwpid_t lwpid)
 135 {
 136   /* All lightweight processes are stopped when under control of GDB.  */
 137   return PS_OK;
 138 }
 139
 140 /* Resume the lightweight process (LWP) LWPID within the target
 141    process PH.  */
 142
 143 ps_err_e
 144 ps_lcontinue (gdb_ps_prochandle_t ph, lwpid_t lwpid)
 145 {
 146   /* Pretend we did successfully continue LWPID.  GDB will take care
 147      of it later on.  */
 148   return PS_OK;
 149 }
 150
 151 /* Get the size of the architecture-dependent extra state registers
 152    for LWP LWPID within the target process PH and return it in
 153    *XREGSIZE.  */
 154
 155 ps_err_e
 156 ps_lgetxregsize (gdb_ps_prochandle_t ph, lwpid_t lwpid, int *xregsize)
 157 {
 158   /* FIXME: Not supported yet.  */
 159   return PS_OK;
 160 }
 161
 162 /* Get the extra state registers of LWP LWPID within the target
 163    process PH and store them in XREGSET.  */
 164
 165 ps_err_e
 166 ps_lgetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
 167 {
 168   /* FIXME: Not supported yet.  */
 169   return PS_OK;
 170 }
 171
 172 /* Set the extra state registers of LWP LWPID within the target
 173    process PH from XREGSET.  */
 174
 175 ps_err_e
 176 ps_lsetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
 177 {
 178   /* FIXME: Not supported yet.  */
 179   return PS_OK;
 180 }
 181
 182 /* Log (additional) diognostic information.  */
 183
 184 void
 185 ps_plog (const char *fmt, ...)
 186 {
 187   va_list args;
 188
 189   va_start (args, fmt);
 190   vfprintf_filtered (gdb_stderr, fmt, args);
 191 }
 192
 193 /* Search for the symbol named NAME within the object named OBJ within
 194    the target process PH.  If the symbol is found the address of the
 195    symbol is stored in SYM_ADDR.  */
 196
 197 ps_err_e
 198 ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *obj,
 199                    const char *name, psaddr_t *sym_addr)
 200 {
 201   struct minimal_symbol *ms;
 202
 203   /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */
 204   ms = lookup_minimal_symbol (name, NULL, NULL);
 205   if (ms == NULL)
 206     return PS_NOSYM;
 207
 208   *sym_addr = core_addr_to_ps_addr (SYMBOL_VALUE_ADDRESS (ms));
 209   return PS_OK;
 210 }
 211
 212 /* Read SIZE bytes from the target process PH at address ADDR and copy
 213    them into BUF.  */
 214
 215 ps_err_e
 216 ps_pdread (gdb_ps_prochandle_t ph, psaddr_t addr,
 217            gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 218 {
 219   return ps_xfer_memory (ph, addr, buf, size, 0);
 220 }
 221
 222 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 223
 224 ps_err_e
 225 ps_pdwrite (gdb_ps_prochandle_t ph, psaddr_t addr,
 226             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
 227 {
 228   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 229 }
 230
 231 /* Read SIZE bytes from the target process PH at address ADDR and copy
 232    them into BUF.  */
 233
 234 ps_err_e
 235 ps_ptread (gdb_ps_prochandle_t ph, psaddr_t addr,
 236            gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 237 {
 238   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 0);
 239 }
 240
 241 /* Write SIZE bytes from BUF into the target process PH at address ADDR.  */
 242
 243 ps_err_e
 244 ps_ptwrite (gdb_ps_prochandle_t ph, psaddr_t addr,
 245             gdb_ps_write_buf_t buf, gdb_ps_size_t size)
 246 {
 247   return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);
 248 }
 249
 250 /* Get the general registers of LWP LWPID within the target process PH
 251    and store them in GREGSET.  */
 252
 253 ps_err_e
 254 ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
 255 {
 256   struct cleanup *old_chain = save_inferior_ptid ();
 257   struct regcache *regcache;
 258
 259   inferior_ptid = BUILD_LWP (lwpid, ph->pid);
 260   regcache = get_thread_regcache (inferior_ptid);
 261
 262   target_fetch_registers (regcache, -1);
 263   fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
 264
 265   do_cleanups (old_chain);
 266   return PS_OK;
 267 }
 268
 269 /* Set the general registers of LWP LWPID within the target process PH
 270    from GREGSET.  */
 271
 272 ps_err_e
 273 ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
 274 {
 275   struct cleanup *old_chain = save_inferior_ptid ();
 276   struct regcache *regcache;
 277
 278   inferior_ptid = BUILD_LWP (lwpid, ph->pid);
 279   regcache = get_thread_regcache (inferior_ptid);
 280
 281   supply_gregset (regcache, (const gdb_gregset_t *) gregset);
 282   target_store_registers (regcache, -1);
 283
 284   do_cleanups (old_chain);
 285   return PS_OK;
 286 }
 287
 288 /* Get the floating-point registers of LWP LWPID within the target
 289    process PH and store them in FPREGSET.  */
 290
 291 ps_err_e
 292 ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
 293                gdb_prfpregset_t *fpregset)
 294 {
 295   struct cleanup *old_chain = save_inferior_ptid ();
 296   struct regcache *regcache;
 297
 298   inferior_ptid = BUILD_LWP (lwpid, ph->pid);
 299   regcache = get_thread_regcache (inferior_ptid);
 300
 301   target_fetch_registers (regcache, -1);
 302   fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
 303
 304   do_cleanups (old_chain);
 305   return PS_OK;
 306 }
 307
 308 /* Set the floating-point registers of LWP LWPID within the target
 309    process PH from FPREGSET.  */
 310
 311 ps_err_e
 312 ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
 313                const gdb_prfpregset_t *fpregset)
 314 {
 315   struct cleanup *old_chain = save_inferior_ptid ();
 316   struct regcache *regcache;
 317
 318   inferior_ptid = BUILD_LWP (lwpid, ph->pid);
 319   regcache = get_thread_regcache (inferior_ptid);
 320
 321   supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
 322   target_store_registers (regcache, -1);
 323
 324   do_cleanups (old_chain);
 325   return PS_OK;
 326 }
 327
 328 /* Return overall process id of the target PH.  Special for GNU/Linux
 329    -- not used on Solaris.  */
 330
 331 pid_t
 332 ps_getpid (gdb_ps_prochandle_t ph)
 333 {
 334   return ph->pid;
 335 }
 336
 337 void
 338 _initialize_proc_service (void)
 339 {
 340   /* This function solely exists to make sure this module is linked
 341      into the final binary.  */
 342 }