gdb/armnbsd-nat.c

   1 /* Native-dependent code for BSD Unix running on ARM's, for GDB.
   2
   3    Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 1999, 2002, 2004, 2007
   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 2 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, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #include "defs.h"
  24 #include "gdbcore.h"
  25 #include "inferior.h"
  26 #include "regcache.h"
  27 #include "target.h"
  28
  29 #include "gdb_string.h"
  30 #include <sys/types.h>
  31 #include <sys/ptrace.h>
  32 #include <machine/reg.h>
  33 #include <machine/frame.h>
  34
  35 #include "arm-tdep.h"
  36 #include "inf-ptrace.h"
  37
  38 extern int arm_apcs_32;
  39
  40 static void
  41 arm_supply_gregset (struct regcache *regcache, struct reg *gregset)
  42 {
  43   int regno;
  44   CORE_ADDR r_pc;
  45
  46   /* Integer registers.  */
  47   for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
  48     regcache_raw_supply (regcache, regno, (char *) &gregset->r[regno]);
  49
  50   regcache_raw_supply (regcache, ARM_SP_REGNUM,
  51                        (char *) &gregset->r_sp);
  52   regcache_raw_supply (regcache, ARM_LR_REGNUM,
  53                        (char *) &gregset->r_lr);
  54   /* This is ok: we're running native...  */
  55   r_pc = ADDR_BITS_REMOVE (gregset->r_pc);
  56   regcache_raw_supply (regcache, ARM_PC_REGNUM, (char *) &r_pc);
  57
  58   if (arm_apcs_32)
  59     regcache_raw_supply (regcache, ARM_PS_REGNUM,
  60                          (char *) &gregset->r_cpsr);
  61   else
  62     regcache_raw_supply (regcache, ARM_PS_REGNUM,
  63                          (char *) &gregset->r_pc);
  64 }
  65
  66 static void
  67 arm_supply_fparegset (struct regcache *regcache, struct fpreg *fparegset)
  68 {
  69   int regno;
  70
  71   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
  72     regcache_raw_supply (regcache, regno,
  73                          (char *) &fparegset->fpr[regno - ARM_F0_REGNUM]);
  74
  75   regcache_raw_supply (regcache, ARM_FPS_REGNUM,
  76                        (char *) &fparegset->fpr_fpsr);
  77 }
  78
  79 static void
  80 fetch_register (struct regcache *regcache, int regno)
  81 {
  82   struct reg inferior_registers;
  83   int ret;
  84
  85   ret = ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  86                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
  87
  88   if (ret < 0)
  89     {
  90       warning (_("unable to fetch general register"));
  91       return;
  92     }
  93
  94   switch (regno)
  95     {
  96     case ARM_SP_REGNUM:
  97       regcache_raw_supply (regcache, ARM_SP_REGNUM,
  98                            (char *) &inferior_registers.r_sp);
  99       break;
 100
 101     case ARM_LR_REGNUM:
 102       regcache_raw_supply (regcache, ARM_LR_REGNUM,
 103                            (char *) &inferior_registers.r_lr);
 104       break;
 105
 106     case ARM_PC_REGNUM:
 107       /* This is ok: we're running native... */
 108       inferior_registers.r_pc = ADDR_BITS_REMOVE (inferior_registers.r_pc);
 109       regcache_raw_supply (regcache, ARM_PC_REGNUM,
 110                            (char *) &inferior_registers.r_pc);
 111       break;
 112
 113     case ARM_PS_REGNUM:
 114       if (arm_apcs_32)
 115         regcache_raw_supply (regcache, ARM_PS_REGNUM,
 116                              (char *) &inferior_registers.r_cpsr);
 117       else
 118         regcache_raw_supply (regcache, ARM_PS_REGNUM,
 119                              (char *) &inferior_registers.r_pc);
 120       break;
 121
 122     default:
 123       regcache_raw_supply (regcache, regno,
 124                            (char *) &inferior_registers.r[regno]);
 125       break;
 126     }
 127 }
 128
 129 static void
 130 fetch_regs (struct regcache *regcache)
 131 {
 132   struct reg inferior_registers;
 133   int ret;
 134   int regno;
 135
 136   ret = ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 137                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 138
 139   if (ret < 0)
 140     {
 141       warning (_("unable to fetch general registers"));
 142       return;
 143     }
 144
 145   arm_supply_gregset (regcache, &inferior_registers);
 146 }
 147
 148 static void
 149 fetch_fp_register (struct regcache *regcache, int regno)
 150 {
 151   struct fpreg inferior_fp_registers;
 152   int ret;
 153
 154   ret = ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 155                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 156
 157   if (ret < 0)
 158     {
 159       warning (_("unable to fetch floating-point register"));
 160       return;
 161     }
 162
 163   switch (regno)
 164     {
 165     case ARM_FPS_REGNUM:
 166       regcache_raw_supply (regcache, ARM_FPS_REGNUM,
 167                            (char *) &inferior_fp_registers.fpr_fpsr);
 168       break;
 169
 170     default:
 171       regcache_raw_supply (regcache, regno,
 172                            (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 173       break;
 174     }
 175 }
 176
 177 static void
 178 fetch_fp_regs (struct regcache *regcache)
 179 {
 180   struct fpreg inferior_fp_registers;
 181   int ret;
 182   int regno;
 183
 184   ret = ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 185                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 186
 187   if (ret < 0)
 188     {
 189       warning (_("unable to fetch general registers"));
 190       return;
 191     }
 192
 193   arm_supply_fparegset (regcache, &inferior_fp_registers);
 194 }
 195
 196 static void
 197 armnbsd_fetch_registers (struct regcache *regcache, int regno)
 198 {
 199   if (regno >= 0)
 200     {
 201       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 202         fetch_register (regcache, regno);
 203       else
 204         fetch_fp_register (regcache, regno);
 205     }
 206   else
 207     {
 208       fetch_regs (regcache);
 209       fetch_fp_regs (regcache);
 210     }
 211 }
 212
 213
 214 static void
 215 store_register (const struct regcache *regcache, int regno)
 216 {
 217   struct reg inferior_registers;
 218   int ret;
 219
 220   ret = ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 221                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 222
 223   if (ret < 0)
 224     {
 225       warning (_("unable to fetch general registers"));
 226       return;
 227     }
 228
 229   switch (regno)
 230     {
 231     case ARM_SP_REGNUM:
 232       regcache_raw_collect (regcache, ARM_SP_REGNUM,
 233                             (char *) &inferior_registers.r_sp);
 234       break;
 235
 236     case ARM_LR_REGNUM:
 237       regcache_raw_collect (regcache, ARM_LR_REGNUM,
 238                             (char *) &inferior_registers.r_lr);
 239       break;
 240
 241     case ARM_PC_REGNUM:
 242       if (arm_apcs_32)
 243         regcache_raw_collect (regcache, ARM_PC_REGNUM,
 244                               (char *) &inferior_registers.r_pc);
 245       else
 246         {
 247           unsigned pc_val;
 248
 249           regcache_raw_collect (regcache, ARM_PC_REGNUM,
 250                                 (char *) &pc_val);
 251
 252           pc_val = ADDR_BITS_REMOVE (pc_val);
 253           inferior_registers.r_pc
 254             ^= ADDR_BITS_REMOVE (inferior_registers.r_pc);
 255           inferior_registers.r_pc |= pc_val;
 256         }
 257       break;
 258
 259     case ARM_PS_REGNUM:
 260       if (arm_apcs_32)
 261         regcache_raw_collect (regcache, ARM_PS_REGNUM,
 262                               (char *) &inferior_registers.r_cpsr);
 263       else
 264         {
 265           unsigned psr_val;
 266
 267           regcache_raw_collect (regcache, ARM_PS_REGNUM,
 268                                 (char *) &psr_val);
 269
 270           psr_val ^= ADDR_BITS_REMOVE (psr_val);
 271           inferior_registers.r_pc = ADDR_BITS_REMOVE (inferior_registers.r_pc);
 272           inferior_registers.r_pc |= psr_val;
 273         }
 274       break;
 275
 276     default:
 277       regcache_raw_collect (regcache, regno,
 278                             (char *) &inferior_registers.r[regno]);
 279       break;
 280     }
 281
 282   ret = ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 283                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 284
 285   if (ret < 0)
 286     warning (_("unable to write register %d to inferior"), regno);
 287 }
 288
 289 static void
 290 store_regs (const struct regcache *regcache)
 291 {
 292   struct reg inferior_registers;
 293   int ret;
 294   int regno;
 295
 296
 297   for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
 298     regcache_raw_collect (regcache, regno,
 299                           (char *) &inferior_registers.r[regno]);
 300
 301   regcache_raw_collect (regcache, ARM_SP_REGNUM,
 302                         (char *) &inferior_registers.r_sp);
 303   regcache_raw_collect (regcache, ARM_LR_REGNUM,
 304                         (char *) &inferior_registers.r_lr);
 305
 306   if (arm_apcs_32)
 307     {
 308       regcache_raw_collect (regcache, ARM_PC_REGNUM,
 309                             (char *) &inferior_registers.r_pc);
 310       regcache_raw_collect (regcache, ARM_PS_REGNUM,
 311                             (char *) &inferior_registers.r_cpsr);
 312     }
 313   else
 314     {
 315       unsigned pc_val;
 316       unsigned psr_val;
 317
 318       regcache_raw_collect (regcache, ARM_PC_REGNUM,
 319                             (char *) &pc_val);
 320       regcache_raw_collect (regcache, ARM_PS_REGNUM,
 321                             (char *) &psr_val);
 322
 323       pc_val = ADDR_BITS_REMOVE (pc_val);
 324       psr_val ^= ADDR_BITS_REMOVE (psr_val);
 325
 326       inferior_registers.r_pc = pc_val | psr_val;
 327     }
 328
 329   ret = ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 330                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 331
 332   if (ret < 0)
 333     warning (_("unable to store general registers"));
 334 }
 335
 336 static void
 337 store_fp_register (const struct regcache *regcache, int regno)
 338 {
 339   struct fpreg inferior_fp_registers;
 340   int ret;
 341
 342   ret = ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 343                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 344
 345   if (ret < 0)
 346     {
 347       warning (_("unable to fetch floating-point registers"));
 348       return;
 349     }
 350
 351   switch (regno)
 352     {
 353     case ARM_FPS_REGNUM:
 354       regcache_raw_collect (regcache, ARM_FPS_REGNUM,
 355                             (char *) &inferior_fp_registers.fpr_fpsr);
 356       break;
 357
 358     default:
 359       regcache_raw_collect (regcache, regno,
 360                             (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 361       break;
 362     }
 363
 364   ret = ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 365                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 366
 367   if (ret < 0)
 368     warning (_("unable to write register %d to inferior"), regno);
 369 }
 370
 371 static void
 372 store_fp_regs (const struct regcache *regcache)
 373 {
 374   struct fpreg inferior_fp_registers;
 375   int ret;
 376   int regno;
 377
 378
 379   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
 380     regcache_raw_collect (regcache, regno,
 381                           (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 382
 383   regcache_raw_collect (regcache, ARM_FPS_REGNUM,
 384                         (char *) &inferior_fp_registers.fpr_fpsr);
 385
 386   ret = ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 387                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 388
 389   if (ret < 0)
 390     warning (_("unable to store floating-point registers"));
 391 }
 392
 393 static void
 394 armnbsd_store_registers (struct regcache *regcache, int regno)
 395 {
 396   if (regno >= 0)
 397     {
 398       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 399         store_register (regcache, regno);
 400       else
 401         store_fp_register (regcache, regno);
 402     }
 403   else
 404     {
 405       store_regs (regcache);
 406       store_fp_regs (regcache);
 407     }
 408 }
 409
 410 struct md_core
 411 {
 412   struct reg intreg;
 413   struct fpreg freg;
 414 };
 415
 416 static void
 417 fetch_core_registers (struct regcache *regcache,
 418                       char *core_reg_sect, unsigned core_reg_size,
 419                       int which, CORE_ADDR ignore)
 420 {
 421   struct md_core *core_reg = (struct md_core *) core_reg_sect;
 422   int regno;
 423   CORE_ADDR r_pc;
 424
 425   arm_supply_gregset (regcache, &core_reg->intreg);
 426   arm_supply_fparegset (regcache, &core_reg->freg);
 427 }
 428
 429 static void
 430 fetch_elfcore_registers (struct regcache *regcache,
 431                          char *core_reg_sect, unsigned core_reg_size,
 432                          int which, CORE_ADDR ignore)
 433 {
 434   struct reg gregset;
 435   struct fpreg fparegset;
 436
 437   switch (which)
 438     {
 439     case 0:     /* Integer registers.  */
 440       if (core_reg_size != sizeof (struct reg))
 441         warning (_("wrong size of register set in core file"));
 442       else
 443         {
 444           /* The memcpy may be unnecessary, but we can't really be sure
 445              of the alignment of the data in the core file.  */
 446           memcpy (&gregset, core_reg_sect, sizeof (gregset));
 447           arm_supply_gregset (regcache, &gregset);
 448         }
 449       break;
 450
 451     case 2:
 452       if (core_reg_size != sizeof (struct fpreg))
 453         warning (_("wrong size of FPA register set in core file"));
 454       else
 455         {
 456           /* The memcpy may be unnecessary, but we can't really be sure
 457              of the alignment of the data in the core file.  */
 458           memcpy (&fparegset, core_reg_sect, sizeof (fparegset));
 459           arm_supply_fparegset (regcache, &fparegset);
 460         }
 461       break;
 462
 463     default:
 464       /* Don't know what kind of register request this is; just ignore it.  */
 465       break;
 466     }
 467 }
 468
 469 static struct core_fns arm_netbsd_core_fns =
 470 {
 471   bfd_target_unknown_flavour,           /* core_flovour.  */
 472   default_check_format,                 /* check_format.  */
 473   default_core_sniffer,                 /* core_sniffer.  */
 474   fetch_core_registers,                 /* core_read_registers.  */
 475   NULL
 476 };
 477
 478 static struct core_fns arm_netbsd_elfcore_fns =
 479 {
 480   bfd_target_elf_flavour,               /* core_flovour.  */
 481   default_check_format,                 /* check_format.  */
 482   default_core_sniffer,                 /* core_sniffer.  */
 483   fetch_elfcore_registers,              /* core_read_registers.  */
 484   NULL
 485 };
 486
 487 void
 488 _initialize_arm_netbsd_nat (void)
 489 {
 490   struct target_ops *t;
 491
 492   t = inf_ptrace_target ();
 493   t->to_fetch_registers = armnbsd_fetch_registers;
 494   t->to_store_registers = armnbsd_store_registers;
 495   add_target (t);
 496
 497   deprecated_add_core_fns (&arm_netbsd_core_fns);
 498   deprecated_add_core_fns (&arm_netbsd_elfcore_fns);
 499 }