gdb/arm-nbsd-nat.c

   1 /* Native-dependent code for BSD Unix running on ARM's, for GDB.
   2
   3    Copyright (C) 1988-2019 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 /* Standard C includes.  */
  23 #include <machine/frame.h>
  24 #include <machine/reg.h>
  25 #include <sys/ptrace.h>
  26 #include <sys/types.h>
  27
  28 /* Local non-gdb includes.  */
  29 #include "arm-tdep.h"
  30 #include "gdbcore.h"
  31 #include "inf-ptrace.h"
  32 #include "inferior.h"
  33 #include "regcache.h"
  34 #include "target.h"
  35
  36 class arm_netbsd_nat_target final : public inf_ptrace_target
  37 {
  38 public:
  39   /* Add our register access methods.  */
  40   void fetch_registers (struct regcache *, int) override;
  41   void store_registers (struct regcache *, int) override;
  42 };
  43
  44 static arm_netbsd_nat_target the_arm_netbsd_nat_target;
  45
  46 extern int arm_apcs_32;
  47
  48 static void
  49 arm_supply_gregset (struct regcache *regcache, struct reg *gregset)
  50 {
  51   int regno;
  52   CORE_ADDR r_pc;
  53
  54   /* Integer registers.  */
  55   for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
  56     regcache->raw_supply (regno, (char *) &gregset->r[regno]);
  57
  58   regcache->raw_supply (ARM_SP_REGNUM, (char *) &gregset->r_sp);
  59   regcache->raw_supply (ARM_LR_REGNUM, (char *) &gregset->r_lr);
  60   /* This is ok: we're running native...  */
  61   r_pc = gdbarch_addr_bits_remove (regcache->arch (), gregset->r_pc);
  62   regcache->raw_supply (ARM_PC_REGNUM, (char *) &r_pc);
  63
  64   if (arm_apcs_32)
  65     regcache->raw_supply (ARM_PS_REGNUM, (char *) &gregset->r_cpsr);
  66   else
  67     regcache->raw_supply (ARM_PS_REGNUM, (char *) &gregset->r_pc);
  68 }
  69
  70 static void
  71 arm_supply_fparegset (struct regcache *regcache, struct fpreg *fparegset)
  72 {
  73   int regno;
  74
  75   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
  76     regcache->raw_supply (regno,
  77                           (char *) &fparegset->fpr[regno - ARM_F0_REGNUM]);
  78
  79   regcache->raw_supply (ARM_FPS_REGNUM, (char *) &fparegset->fpr_fpsr);
  80 }
  81
  82 static void
  83 fetch_register (struct regcache *regcache, int regno)
  84 {
  85   struct reg inferior_registers;
  86   int ret;
  87
  88   ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
  89                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
  90
  91   if (ret < 0)
  92     {
  93       warning (_("unable to fetch general register"));
  94       return;
  95     }
  96
  97   switch (regno)
  98     {
  99     case ARM_SP_REGNUM:
 100       regcache->raw_supply (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp);
 101       break;
 102
 103     case ARM_LR_REGNUM:
 104       regcache->raw_supply (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr);
 105       break;
 106
 107     case ARM_PC_REGNUM:
 108       /* This is ok: we're running native...  */
 109       inferior_registers.r_pc = gdbarch_addr_bits_remove
 110                                   (regcache->arch (),
 111                                    inferior_registers.r_pc);
 112       regcache->raw_supply (ARM_PC_REGNUM, (char *) &inferior_registers.r_pc);
 113       break;
 114
 115     case ARM_PS_REGNUM:
 116       if (arm_apcs_32)
 117         regcache->raw_supply (ARM_PS_REGNUM,
 118                               (char *) &inferior_registers.r_cpsr);
 119       else
 120         regcache->raw_supply (ARM_PS_REGNUM,
 121                               (char *) &inferior_registers.r_pc);
 122       break;
 123
 124     default:
 125       regcache->raw_supply (regno, (char *) &inferior_registers.r[regno]);
 126       break;
 127     }
 128 }
 129
 130 static void
 131 fetch_regs (struct regcache *regcache)
 132 {
 133   struct reg inferior_registers;
 134   int ret;
 135   int regno;
 136
 137   ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
 138                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 139
 140   if (ret < 0)
 141     {
 142       warning (_("unable to fetch general registers"));
 143       return;
 144     }
 145
 146   arm_supply_gregset (regcache, &inferior_registers);
 147 }
 148
 149 static void
 150 fetch_fp_register (struct regcache *regcache, int regno)
 151 {
 152   struct fpreg inferior_fp_registers;
 153   int ret;
 154
 155   ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 156                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 157
 158   if (ret < 0)
 159     {
 160       warning (_("unable to fetch floating-point register"));
 161       return;
 162     }
 163
 164   switch (regno)
 165     {
 166     case ARM_FPS_REGNUM:
 167       regcache->raw_supply (ARM_FPS_REGNUM,
 168                             (char *) &inferior_fp_registers.fpr_fpsr);
 169       break;
 170
 171     default:
 172       regcache->raw_supply
 173         (regno, (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 174       break;
 175     }
 176 }
 177
 178 static void
 179 fetch_fp_regs (struct regcache *regcache)
 180 {
 181   struct fpreg inferior_fp_registers;
 182   int ret;
 183   int regno;
 184
 185   ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 186                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 187
 188   if (ret < 0)
 189     {
 190       warning (_("unable to fetch general registers"));
 191       return;
 192     }
 193
 194   arm_supply_fparegset (regcache, &inferior_fp_registers);
 195 }
 196
 197 void
 198 arm_nbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
 199 {
 200   if (regno >= 0)
 201     {
 202       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 203         fetch_register (regcache, regno);
 204       else
 205         fetch_fp_register (regcache, regno);
 206     }
 207   else
 208     {
 209       fetch_regs (regcache);
 210       fetch_fp_regs (regcache);
 211     }
 212 }
 213
 214
 215 static void
 216 store_register (const struct regcache *regcache, int regno)
 217 {
 218   struct gdbarch *gdbarch = regcache->arch ();
 219   struct reg inferior_registers;
 220   int ret;
 221
 222   ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
 223                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 224
 225   if (ret < 0)
 226     {
 227       warning (_("unable to fetch general registers"));
 228       return;
 229     }
 230
 231   switch (regno)
 232     {
 233     case ARM_SP_REGNUM:
 234       regcache->raw_collect (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp);
 235       break;
 236
 237     case ARM_LR_REGNUM:
 238       regcache->raw_collect (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr);
 239       break;
 240
 241     case ARM_PC_REGNUM:
 242       if (arm_apcs_32)
 243         regcache->raw_collect (ARM_PC_REGNUM,
 244                                (char *) &inferior_registers.r_pc);
 245       else
 246         {
 247           unsigned pc_val;
 248
 249           regcache->raw_collect (ARM_PC_REGNUM, (char *) &pc_val);
 250
 251           pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val);
 252           inferior_registers.r_pc ^= gdbarch_addr_bits_remove
 253                                        (gdbarch, inferior_registers.r_pc);
 254           inferior_registers.r_pc |= pc_val;
 255         }
 256       break;
 257
 258     case ARM_PS_REGNUM:
 259       if (arm_apcs_32)
 260         regcache->raw_collect (ARM_PS_REGNUM,
 261                                (char *) &inferior_registers.r_cpsr);
 262       else
 263         {
 264           unsigned psr_val;
 265
 266           regcache->raw_collect (ARM_PS_REGNUM, (char *) &psr_val);
 267
 268           psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val);
 269           inferior_registers.r_pc = gdbarch_addr_bits_remove
 270                                       (gdbarch, inferior_registers.r_pc);
 271           inferior_registers.r_pc |= psr_val;
 272         }
 273       break;
 274
 275     default:
 276       regcache->raw_collect (regno, (char *) &inferior_registers.r[regno]);
 277       break;
 278     }
 279
 280   ret = ptrace (PT_SETREGS, regcache->ptid ().pid (),
 281                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 282
 283   if (ret < 0)
 284     warning (_("unable to write register %d to inferior"), regno);
 285 }
 286
 287 static void
 288 store_regs (const struct regcache *regcache)
 289 {
 290   struct gdbarch *gdbarch = regcache->arch ();
 291   struct reg inferior_registers;
 292   int ret;
 293   int regno;
 294
 295
 296   for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
 297     regcache->raw_collect (regno, (char *) &inferior_registers.r[regno]);
 298
 299   regcache->raw_collect (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp);
 300   regcache->raw_collect (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr);
 301
 302   if (arm_apcs_32)
 303     {
 304       regcache->raw_collect (ARM_PC_REGNUM, (char *) &inferior_registers.r_pc);
 305       regcache->raw_collect (ARM_PS_REGNUM,
 306                              (char *) &inferior_registers.r_cpsr);
 307     }
 308   else
 309     {
 310       unsigned pc_val;
 311       unsigned psr_val;
 312
 313       regcache->raw_collect (ARM_PC_REGNUM, (char *) &pc_val);
 314       regcache->raw_collect (ARM_PS_REGNUM, (char *) &psr_val);
 315
 316       pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val);
 317       psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val);
 318
 319       inferior_registers.r_pc = pc_val | psr_val;
 320     }
 321
 322   ret = ptrace (PT_SETREGS, regcache->ptid ().pid (),
 323                 (PTRACE_TYPE_ARG3) &inferior_registers, 0);
 324
 325   if (ret < 0)
 326     warning (_("unable to store general registers"));
 327 }
 328
 329 static void
 330 store_fp_register (const struct regcache *regcache, int regno)
 331 {
 332   struct fpreg inferior_fp_registers;
 333   int ret;
 334
 335   ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 336                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 337
 338   if (ret < 0)
 339     {
 340       warning (_("unable to fetch floating-point registers"));
 341       return;
 342     }
 343
 344   switch (regno)
 345     {
 346     case ARM_FPS_REGNUM:
 347       regcache->raw_collect (ARM_FPS_REGNUM,
 348                              (char *) &inferior_fp_registers.fpr_fpsr);
 349       break;
 350
 351     default:
 352       regcache->raw_collect
 353         (regno, (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 354       break;
 355     }
 356
 357   ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 358                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 359
 360   if (ret < 0)
 361     warning (_("unable to write register %d to inferior"), regno);
 362 }
 363
 364 static void
 365 store_fp_regs (const struct regcache *regcache)
 366 {
 367   struct fpreg inferior_fp_registers;
 368   int ret;
 369   int regno;
 370
 371
 372   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
 373     regcache->raw_collect
 374       (regno, (char *) &inferior_fp_registers.fpr[regno - ARM_F0_REGNUM]);
 375
 376   regcache->raw_collect (ARM_FPS_REGNUM,
 377                          (char *) &inferior_fp_registers.fpr_fpsr);
 378
 379   ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 380                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, 0);
 381
 382   if (ret < 0)
 383     warning (_("unable to store floating-point registers"));
 384 }
 385
 386 void
 387 arm_nbsd_nat_target::store_registers (struct regcache *regcache, int regno)
 388 {
 389   if (regno >= 0)
 390     {
 391       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 392         store_register (regcache, regno);
 393       else
 394         store_fp_register (regcache, regno);
 395     }
 396   else
 397     {
 398       store_regs (regcache);
 399       store_fp_regs (regcache);
 400     }
 401 }
 402
 403 static void
 404 fetch_elfcore_registers (struct regcache *regcache,
 405                          char *core_reg_sect, unsigned core_reg_size,
 406                          int which, CORE_ADDR ignore)
 407 {
 408   struct reg gregset;
 409   struct fpreg fparegset;
 410
 411   switch (which)
 412     {
 413     case 0:     /* Integer registers.  */
 414       if (core_reg_size != sizeof (struct reg))
 415         warning (_("wrong size of register set in core file"));
 416       else
 417         {
 418           /* The memcpy may be unnecessary, but we can't really be sure
 419              of the alignment of the data in the core file.  */
 420           memcpy (&gregset, core_reg_sect, sizeof (gregset));
 421           arm_supply_gregset (regcache, &gregset);
 422         }
 423       break;
 424
 425     case 2:
 426       if (core_reg_size != sizeof (struct fpreg))
 427         warning (_("wrong size of FPA register set in core file"));
 428       else
 429         {
 430           /* The memcpy may be unnecessary, but we can't really be sure
 431              of the alignment of the data in the core file.  */
 432           memcpy (&fparegset, core_reg_sect, sizeof (fparegset));
 433           arm_supply_fparegset (regcache, &fparegset);
 434         }
 435       break;
 436
 437     default:
 438       /* Don't know what kind of register request this is; just ignore it.  */
 439       break;
 440     }
 441 }
 442
 443 static struct core_fns arm_netbsd_elfcore_fns =
 444 {
 445   bfd_target_elf_flavour,               /* core_flovour.  */
 446   default_check_format,                 /* check_format.  */
 447   default_core_sniffer,                 /* core_sniffer.  */
 448   fetch_elfcore_registers,              /* core_read_registers.  */
 449   NULL
 450 };
 451
 452 void
 453 _initialize_arm_netbsd_nat (void)
 454 {
 455   add_inf_child_target (&the_arm_netbsd_nat_target);
 456
 457   deprecated_add_core_fns (&arm_netbsd_elfcore_fns);
 458 }