gdb/armnbsd-nat.c

   1 /* Native-dependent code for BSD Unix running on ARM's, for GDB.
   2
   3    Copyright (C) 1988-2013 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 #include "gdbcore.h"
  22 #include "inferior.h"
  23 #include "regcache.h"
  24 #include "target.h"
  25
  26 #include "gdb_string.h"
  27 #include <sys/types.h>
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30 #include <machine/frame.h>
  31
  32 #include "arm-tdep.h"
  33 #include "inf-ptrace.h"
  34
  35 extern int arm_apcs_32;
  36
  37 static void
  38 arm_supply_gregset (struct regcache *regcache, struct reg *gregset)
  39 {
  40   int regno;
  41   CORE_ADDR r_pc;
  42
  43   /* Integer registers.  */
  44   for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
  45     regcache_raw_supply (regcache, regno, (char *) &gregset->r[regno]);
  46
  47   regcache_raw_supply (regcache, ARM_SP_REGNUM,
  48                        (char *) &gregset->r_sp);
  49   regcache_raw_supply (regcache, ARM_LR_REGNUM,
  50                        (char *) &gregset->r_lr);
  51   /* This is ok: we're running native...  */
  52   r_pc = gdbarch_addr_bits_remove (get_regcache_arch (regcache), gregset->r_pc);
  53   regcache_raw_supply (regcache, ARM_PC_REGNUM, (char *) &r_pc);
  54
  55   if (arm_apcs_32)
  56     regcache_raw_supply (regcache, ARM_PS_REGNUM,
  57                          (char *) &gregset->r_cpsr);
  58   else
  59     regcache_raw_supply (regcache, ARM_PS_REGNUM,
  60                          (char *) &gregset->r_pc);
  61 }
  62
  63 static void
  64 arm_supply_fparegset (struct regcache *regcache, struct fpreg *fparegset)
  65 {
  66   int regno;
  67
  68   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
  69     regcache_raw_supply (regcache, regno,
  70                          (char *) &fparegset->fpr[regno - ARM_F0_REGNUM]);
  71
  72   regcache_raw_supply (regcache, ARM_FPS_REGNUM,
  73                        (char *) &fparegset->fpr_fpsr);
  74 }
  75
  76 static void
  77 fetch_register (struct regcache *regcache, int regno)
  78 {
  79   struct reg inferior_registers;
  80   int ret;
  81
  82   ret = ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  83                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
  84
  85   if (ret < 0)
  86     {
  87       warning (_("unable to fetch general register"));
  88       return;
  89     }
  90
  91   switch (regno)
  92     {
  93     case ARM_SP_REGNUM:
  94       regcache_raw_supply (regcache, ARM_SP_REGNUM,
  95                            (char *) &inferior_registers.r_sp);
  96       break;
  97
  98     case ARM_LR_REGNUM:
  99       regcache_raw_supply (regcache, ARM_LR_REGNUM,
 100                            (char *) &inferior_registers.r_lr);
 101       break;
 102
 103     case ARM_PC_REGNUM:
 104       /* This is ok: we're running native...  */
 105       inferior_registers.r_pc = gdbarch_addr_bits_remove
 106                                   (get_regcache_arch (regcache),
 107                                    inferior_registers.r_pc);
 108       regcache_raw_supply (regcache, ARM_PC_REGNUM,
 109                            (char *) &inferior_registers.r_pc);
 110       break;
 111
 112     case ARM_PS_REGNUM:
 113       if (arm_apcs_32)
 114         regcache_raw_supply (regcache, ARM_PS_REGNUM,
 115                              (char *) &inferior_registers.r_cpsr);
 116       else
 117         regcache_raw_supply (regcache, ARM_PS_REGNUM,
 118                              (char *) &inferior_registers.r_pc);
 119       break;
 120
 121     default:
 122       regcache_raw_supply (regcache, regno,
 123                            (char *) &inferior_registers.r[regno]);
 124       break;
 125     }
 126 }
 127
 128 static void
 129 fetch_regs (struct regcache *regcache)
 130 {
 131   struct reg inferior_registers;
 132   int ret;
 133   int regno;
 134
 135   ret = ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 136                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 137
 138   if (ret < 0)
 139     {
 140       warning (_("unable to fetch general registers"));
 141       return;
 142     }
 143
 144   arm_supply_gregset (regcache, &inferior_registers);
 145 }
 146
 147 static void
 148 fetch_fp_register (struct regcache *regcache, int regno)
 149 {
 150   struct fpreg inferior_fp_registers;
 151   int ret;
 152
 153   ret = ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 154                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 155
 156   if (ret < 0)
 157     {
 158       warning (_("unable to fetch floating-point register"));
 159       return;
 160     }
 161
 162   switch (regno)
 163     {
 164     case ARM_FPS_REGNUM:
 165       regcache_raw_supply (regcache, ARM_FPS_REGNUM,
 166                            (char *) &inferior_fp_registers.fpr_fpsr);
 167       break;
 168
 169     default:
 170       regcache_raw_supply (regcache, regno,
 171                            (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 172       break;
 173     }
 174 }
 175
 176 static void
 177 fetch_fp_regs (struct regcache *regcache)
 178 {
 179   struct fpreg inferior_fp_registers;
 180   int ret;
 181   int regno;
 182
 183   ret = ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 184                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 185
 186   if (ret < 0)
 187     {
 188       warning (_("unable to fetch general registers"));
 189       return;
 190     }
 191
 192   arm_supply_fparegset (regcache, &inferior_fp_registers);
 193 }
 194
 195 static void
 196 armnbsd_fetch_registers (struct target_ops *ops,
 197                          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 gdbarch *gdbarch = get_regcache_arch (regcache);
 218   struct reg inferior_registers;
 219   int ret;
 220
 221   ret = ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 222                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 223
 224   if (ret < 0)
 225     {
 226       warning (_("unable to fetch general registers"));
 227       return;
 228     }
 229
 230   switch (regno)
 231     {
 232     case ARM_SP_REGNUM:
 233       regcache_raw_collect (regcache, ARM_SP_REGNUM,
 234                             (char *) &inferior_registers.r_sp);
 235       break;
 236
 237     case ARM_LR_REGNUM:
 238       regcache_raw_collect (regcache, ARM_LR_REGNUM,
 239                             (char *) &inferior_registers.r_lr);
 240       break;
 241
 242     case ARM_PC_REGNUM:
 243       if (arm_apcs_32)
 244         regcache_raw_collect (regcache, ARM_PC_REGNUM,
 245                               (char *) &inferior_registers.r_pc);
 246       else
 247         {
 248           unsigned pc_val;
 249
 250           regcache_raw_collect (regcache, ARM_PC_REGNUM,
 251                                 (char *) &pc_val);
 252
 253           pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val);
 254           inferior_registers.r_pc ^= gdbarch_addr_bits_remove
 255                                        (gdbarch, inferior_registers.r_pc);
 256           inferior_registers.r_pc |= pc_val;
 257         }
 258       break;
 259
 260     case ARM_PS_REGNUM:
 261       if (arm_apcs_32)
 262         regcache_raw_collect (regcache, ARM_PS_REGNUM,
 263                               (char *) &inferior_registers.r_cpsr);
 264       else
 265         {
 266           unsigned psr_val;
 267
 268           regcache_raw_collect (regcache, ARM_PS_REGNUM,
 269                                 (char *) &psr_val);
 270
 271           psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val);
 272           inferior_registers.r_pc = gdbarch_addr_bits_remove
 273                                       (gdbarch, inferior_registers.r_pc);
 274           inferior_registers.r_pc |= psr_val;
 275         }
 276       break;
 277
 278     default:
 279       regcache_raw_collect (regcache, regno,
 280                             (char *) &inferior_registers.r[regno]);
 281       break;
 282     }
 283
 284   ret = ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 285                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 286
 287   if (ret < 0)
 288     warning (_("unable to write register %d to inferior"), regno);
 289 }
 290
 291 static void
 292 store_regs (const struct regcache *regcache)
 293 {
 294   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 295   struct reg inferior_registers;
 296   int ret;
 297   int regno;
 298
 299
 300   for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
 301     regcache_raw_collect (regcache, regno,
 302                           (char *) &inferior_registers.r[regno]);
 303
 304   regcache_raw_collect (regcache, ARM_SP_REGNUM,
 305                         (char *) &inferior_registers.r_sp);
 306   regcache_raw_collect (regcache, ARM_LR_REGNUM,
 307                         (char *) &inferior_registers.r_lr);
 308
 309   if (arm_apcs_32)
 310     {
 311       regcache_raw_collect (regcache, ARM_PC_REGNUM,
 312                             (char *) &inferior_registers.r_pc);
 313       regcache_raw_collect (regcache, ARM_PS_REGNUM,
 314                             (char *) &inferior_registers.r_cpsr);
 315     }
 316   else
 317     {
 318       unsigned pc_val;
 319       unsigned psr_val;
 320
 321       regcache_raw_collect (regcache, ARM_PC_REGNUM,
 322                             (char *) &pc_val);
 323       regcache_raw_collect (regcache, ARM_PS_REGNUM,
 324                             (char *) &psr_val);
 325
 326       pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val);
 327       psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val);
 328
 329       inferior_registers.r_pc = pc_val | psr_val;
 330     }
 331
 332   ret = ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 333                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 334
 335   if (ret < 0)
 336     warning (_("unable to store general registers"));
 337 }
 338
 339 static void
 340 store_fp_register (const struct regcache *regcache, int regno)
 341 {
 342   struct fpreg inferior_fp_registers;
 343   int ret;
 344
 345   ret = ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 346                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 347
 348   if (ret < 0)
 349     {
 350       warning (_("unable to fetch floating-point registers"));
 351       return;
 352     }
 353
 354   switch (regno)
 355     {
 356     case ARM_FPS_REGNUM:
 357       regcache_raw_collect (regcache, ARM_FPS_REGNUM,
 358                             (char *) &inferior_fp_registers.fpr_fpsr);
 359       break;
 360
 361     default:
 362       regcache_raw_collect (regcache, regno,
 363                             (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 364       break;
 365     }
 366
 367   ret = ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 368                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 369
 370   if (ret < 0)
 371     warning (_("unable to write register %d to inferior"), regno);
 372 }
 373
 374 static void
 375 store_fp_regs (const struct regcache *regcache)
 376 {
 377   struct fpreg inferior_fp_registers;
 378   int ret;
 379   int regno;
 380
 381
 382   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
 383     regcache_raw_collect (regcache, regno,
 384                           (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 385
 386   regcache_raw_collect (regcache, ARM_FPS_REGNUM,
 387                         (char *) &inferior_fp_registers.fpr_fpsr);
 388
 389   ret = ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 390                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 391
 392   if (ret < 0)
 393     warning (_("unable to store floating-point registers"));
 394 }
 395
 396 static void
 397 armnbsd_store_registers (struct target_ops *ops,
 398                          struct regcache *regcache, int regno)
 399 {
 400   if (regno >= 0)
 401     {
 402       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 403         store_register (regcache, regno);
 404       else
 405         store_fp_register (regcache, regno);
 406     }
 407   else
 408     {
 409       store_regs (regcache);
 410       store_fp_regs (regcache);
 411     }
 412 }
 413
 414 struct md_core
 415 {
 416   struct reg intreg;
 417   struct fpreg freg;
 418 };
 419
 420 static void
 421 fetch_core_registers (struct regcache *regcache,
 422                       char *core_reg_sect, unsigned core_reg_size,
 423                       int which, CORE_ADDR ignore)
 424 {
 425   struct md_core *core_reg = (struct md_core *) core_reg_sect;
 426   int regno;
 427   CORE_ADDR r_pc;
 428
 429   arm_supply_gregset (regcache, &core_reg->intreg);
 430   arm_supply_fparegset (regcache, &core_reg->freg);
 431 }
 432
 433 static void
 434 fetch_elfcore_registers (struct regcache *regcache,
 435                          char *core_reg_sect, unsigned core_reg_size,
 436                          int which, CORE_ADDR ignore)
 437 {
 438   struct reg gregset;
 439   struct fpreg fparegset;
 440
 441   switch (which)
 442     {
 443     case 0:     /* Integer registers.  */
 444       if (core_reg_size != sizeof (struct reg))
 445         warning (_("wrong size of register set in core file"));
 446       else
 447         {
 448           /* The memcpy may be unnecessary, but we can't really be sure
 449              of the alignment of the data in the core file.  */
 450           memcpy (&gregset, core_reg_sect, sizeof (gregset));
 451           arm_supply_gregset (regcache, &gregset);
 452         }
 453       break;
 454
 455     case 2:
 456       if (core_reg_size != sizeof (struct fpreg))
 457         warning (_("wrong size of FPA register set in core file"));
 458       else
 459         {
 460           /* The memcpy may be unnecessary, but we can't really be sure
 461              of the alignment of the data in the core file.  */
 462           memcpy (&fparegset, core_reg_sect, sizeof (fparegset));
 463           arm_supply_fparegset (regcache, &fparegset);
 464         }
 465       break;
 466
 467     default:
 468       /* Don't know what kind of register request this is; just ignore it.  */
 469       break;
 470     }
 471 }
 472
 473 static struct core_fns arm_netbsd_core_fns =
 474 {
 475   bfd_target_unknown_flavour,           /* core_flovour.  */
 476   default_check_format,                 /* check_format.  */
 477   default_core_sniffer,                 /* core_sniffer.  */
 478   fetch_core_registers,                 /* core_read_registers.  */
 479   NULL
 480 };
 481
 482 static struct core_fns arm_netbsd_elfcore_fns =
 483 {
 484   bfd_target_elf_flavour,               /* core_flovour.  */
 485   default_check_format,                 /* check_format.  */
 486   default_core_sniffer,                 /* core_sniffer.  */
 487   fetch_elfcore_registers,              /* core_read_registers.  */
 488   NULL
 489 };
 490
 491 void
 492 _initialize_arm_netbsd_nat (void)
 493 {
 494   struct target_ops *t;
 495
 496   t = inf_ptrace_target ();
 497   t->to_fetch_registers = armnbsd_fetch_registers;
 498   t->to_store_registers = armnbsd_store_registers;
 499   add_target (t);
 500
 501   deprecated_add_core_fns (&arm_netbsd_core_fns);
 502   deprecated_add_core_fns (&arm_netbsd_elfcore_fns);
 503 }