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    2008 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 #include "gdbcore.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26
  27 #include "gdb_string.h"
  28 #include <sys/types.h>
  29 #include <sys/ptrace.h>
  30 #include <machine/reg.h>
  31 #include <machine/frame.h>
  32
  33 #include "arm-tdep.h"
  34 #include "inf-ptrace.h"
  35
  36 extern int arm_apcs_32;
  37
  38 static void
  39 arm_supply_gregset (struct regcache *regcache, struct reg *gregset)
  40 {
  41   int regno;
  42   CORE_ADDR r_pc;
  43
  44   /* Integer registers.  */
  45   for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
  46     regcache_raw_supply (regcache, regno, (char *) &gregset->r[regno]);
  47
  48   regcache_raw_supply (regcache, ARM_SP_REGNUM,
  49                        (char *) &gregset->r_sp);
  50   regcache_raw_supply (regcache, ARM_LR_REGNUM,
  51                        (char *) &gregset->r_lr);
  52   /* This is ok: we're running native...  */
  53   r_pc = gdbarch_addr_bits_remove (get_regcache_arch (regcache), gregset->r_pc);
  54   regcache_raw_supply (regcache, ARM_PC_REGNUM, (char *) &r_pc);
  55
  56   if (arm_apcs_32)
  57     regcache_raw_supply (regcache, ARM_PS_REGNUM,
  58                          (char *) &gregset->r_cpsr);
  59   else
  60     regcache_raw_supply (regcache, ARM_PS_REGNUM,
  61                          (char *) &gregset->r_pc);
  62 }
  63
  64 static void
  65 arm_supply_fparegset (struct regcache *regcache, struct fpreg *fparegset)
  66 {
  67   int regno;
  68
  69   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
  70     regcache_raw_supply (regcache, regno,
  71                          (char *) &fparegset->fpr[regno - ARM_F0_REGNUM]);
  72
  73   regcache_raw_supply (regcache, ARM_FPS_REGNUM,
  74                        (char *) &fparegset->fpr_fpsr);
  75 }
  76
  77 static void
  78 fetch_register (struct regcache *regcache, int regno)
  79 {
  80   struct reg inferior_registers;
  81   int ret;
  82
  83   ret = ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  84                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
  85
  86   if (ret < 0)
  87     {
  88       warning (_("unable to fetch general register"));
  89       return;
  90     }
  91
  92   switch (regno)
  93     {
  94     case ARM_SP_REGNUM:
  95       regcache_raw_supply (regcache, ARM_SP_REGNUM,
  96                            (char *) &inferior_registers.r_sp);
  97       break;
  98
  99     case ARM_LR_REGNUM:
 100       regcache_raw_supply (regcache, ARM_LR_REGNUM,
 101                            (char *) &inferior_registers.r_lr);
 102       break;
 103
 104     case ARM_PC_REGNUM:
 105       /* This is ok: we're running native... */
 106       inferior_registers.r_pc = gdbarch_addr_bits_remove
 107                                   (get_regcache_arch (regcache),
 108                                    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 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 regcache *regcache, int regno)
 398 {
 399   if (regno >= 0)
 400     {
 401       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 402         store_register (regcache, regno);
 403       else
 404         store_fp_register (regcache, regno);
 405     }
 406   else
 407     {
 408       store_regs (regcache);
 409       store_fp_regs (regcache);
 410     }
 411 }
 412
 413 struct md_core
 414 {
 415   struct reg intreg;
 416   struct fpreg freg;
 417 };
 418
 419 static void
 420 fetch_core_registers (struct regcache *regcache,
 421                       char *core_reg_sect, unsigned core_reg_size,
 422                       int which, CORE_ADDR ignore)
 423 {
 424   struct md_core *core_reg = (struct md_core *) core_reg_sect;
 425   int regno;
 426   CORE_ADDR r_pc;
 427
 428   arm_supply_gregset (regcache, &core_reg->intreg);
 429   arm_supply_fparegset (regcache, &core_reg->freg);
 430 }
 431
 432 static void
 433 fetch_elfcore_registers (struct regcache *regcache,
 434                          char *core_reg_sect, unsigned core_reg_size,
 435                          int which, CORE_ADDR ignore)
 436 {
 437   struct reg gregset;
 438   struct fpreg fparegset;
 439
 440   switch (which)
 441     {
 442     case 0:     /* Integer registers.  */
 443       if (core_reg_size != sizeof (struct reg))
 444         warning (_("wrong size of register set in core file"));
 445       else
 446         {
 447           /* The memcpy may be unnecessary, but we can't really be sure
 448              of the alignment of the data in the core file.  */
 449           memcpy (&gregset, core_reg_sect, sizeof (gregset));
 450           arm_supply_gregset (regcache, &gregset);
 451         }
 452       break;
 453
 454     case 2:
 455       if (core_reg_size != sizeof (struct fpreg))
 456         warning (_("wrong size of FPA register set in core file"));
 457       else
 458         {
 459           /* The memcpy may be unnecessary, but we can't really be sure
 460              of the alignment of the data in the core file.  */
 461           memcpy (&fparegset, core_reg_sect, sizeof (fparegset));
 462           arm_supply_fparegset (regcache, &fparegset);
 463         }
 464       break;
 465
 466     default:
 467       /* Don't know what kind of register request this is; just ignore it.  */
 468       break;
 469     }
 470 }
 471
 472 static struct core_fns arm_netbsd_core_fns =
 473 {
 474   bfd_target_unknown_flavour,           /* core_flovour.  */
 475   default_check_format,                 /* check_format.  */
 476   default_core_sniffer,                 /* core_sniffer.  */
 477   fetch_core_registers,                 /* core_read_registers.  */
 478   NULL
 479 };
 480
 481 static struct core_fns arm_netbsd_elfcore_fns =
 482 {
 483   bfd_target_elf_flavour,               /* core_flovour.  */
 484   default_check_format,                 /* check_format.  */
 485   default_core_sniffer,                 /* core_sniffer.  */
 486   fetch_elfcore_registers,              /* core_read_registers.  */
 487   NULL
 488 };
 489
 490 void
 491 _initialize_arm_netbsd_nat (void)
 492 {
 493   struct target_ops *t;
 494
 495   t = inf_ptrace_target ();
 496   t->to_fetch_registers = armnbsd_fetch_registers;
 497   t->to_store_registers = armnbsd_store_registers;
 498   add_target (t);
 499
 500   deprecated_add_core_fns (&arm_netbsd_core_fns);
 501   deprecated_add_core_fns (&arm_netbsd_elfcore_fns);
 502 }