gdb/arm-netbsd-nat.c

   1 /* Native-dependent code for BSD Unix running on ARM's, for GDB.
   2
   3    Copyright (C) 1988-2024 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 /* We define this to get types like register_t.  */
  21 #define _KERNTYPES
  22 #include "gdbcore.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26 #include <sys/types.h>
  27 #include <sys/ptrace.h>
  28 #include <sys/sysctl.h>
  29 #include <machine/reg.h>
  30 #include <machine/frame.h>
  31
  32 #include "arm-tdep.h"
  33 #include "arm-netbsd-tdep.h"
  34 #include "aarch32-tdep.h"
  35 #include "inf-ptrace.h"
  36 #include "netbsd-nat.h"
  37
  38 class arm_netbsd_nat_target final : public nbsd_nat_target
  39 {
  40 public:
  41   /* Add our register access methods.  */
  42   void fetch_registers (struct regcache *, int) override;
  43   void store_registers (struct regcache *, int) override;
  44   const struct target_desc *read_description () override;
  45 };
  46
  47 static arm_netbsd_nat_target the_arm_netbsd_nat_target;
  48
  49 static void
  50 arm_supply_vfpregset (struct regcache *regcache, struct fpreg *fpregset)
  51 {
  52   arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (regcache->arch ());
  53   if (tdep->vfp_register_count == 0)
  54     return;
  55
  56   struct vfpreg &vfp = fpregset->fpr_vfp;
  57   for (int regno = 0; regno <= tdep->vfp_register_count; regno++)
  58     regcache->raw_supply (regno + ARM_D0_REGNUM, (char *) &vfp.vfp_regs[regno]);
  59
  60   regcache->raw_supply (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr);
  61 }
  62
  63 static void
  64 fetch_register (struct regcache *regcache, int regno)
  65 {
  66   struct reg inferior_registers;
  67   int ret;
  68   int lwp = regcache->ptid ().lwp ();
  69
  70   ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
  71                 (PTRACE_TYPE_ARG3) &inferior_registers, lwp);
  72
  73   if (ret < 0)
  74     {
  75       warning (_("unable to fetch general register"));
  76       return;
  77     }
  78   arm_nbsd_supply_gregset (nullptr, regcache, regno, &inferior_registers,
  79                            sizeof (inferior_registers));
  80 }
  81
  82 static void
  83 fetch_fp_register (struct regcache *regcache, int regno)
  84 {
  85   struct fpreg inferior_fp_registers;
  86   int lwp = regcache->ptid ().lwp ();
  87
  88   int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
  89                     (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
  90
  91   struct vfpreg &vfp = inferior_fp_registers.fpr_vfp;
  92
  93   if (ret < 0)
  94     {
  95       warning (_("unable to fetch floating-point register"));
  96       return;
  97     }
  98
  99   arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (regcache->arch ());
 100   if (regno == ARM_FPSCR_REGNUM && tdep->vfp_register_count != 0)
 101     regcache->raw_supply (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr);
 102   else if (regno >= ARM_D0_REGNUM
 103            && regno <= ARM_D0_REGNUM + tdep->vfp_register_count)
 104     {
 105       regcache->raw_supply (regno,
 106                             (char *) &vfp.vfp_regs[regno - ARM_D0_REGNUM]);
 107     }
 108   else
 109     warning (_("Invalid register number."));
 110 }
 111
 112 static void
 113 fetch_fp_regs (struct regcache *regcache)
 114 {
 115   struct fpreg inferior_fp_registers;
 116   int lwp = regcache->ptid ().lwp ();
 117   int ret;
 118   int regno;
 119
 120   ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 121                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
 122
 123   if (ret < 0)
 124     {
 125       warning (_("unable to fetch general registers"));
 126       return;
 127     }
 128
 129   arm_supply_vfpregset (regcache, &inferior_fp_registers);
 130 }
 131
 132 void
 133 arm_netbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
 134 {
 135   if (regno >= 0)
 136     {
 137       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 138         fetch_register (regcache, regno);
 139       else
 140         fetch_fp_register (regcache, regno);
 141     }
 142   else
 143     {
 144       fetch_register (regcache, -1);
 145       fetch_fp_regs (regcache);
 146     }
 147 }
 148
 149
 150 static void
 151 store_register (const struct regcache *regcache, int regno)
 152 {
 153   struct gdbarch *gdbarch = regcache->arch ();
 154   struct reg inferior_registers;
 155   int lwp = regcache->ptid ().lwp ();
 156   int ret;
 157
 158   ret = ptrace (PT_GETREGS, regcache->ptid ().pid (),
 159                 (PTRACE_TYPE_ARG3) &inferior_registers, lwp);
 160
 161   if (ret < 0)
 162     {
 163       warning (_("unable to fetch general registers"));
 164       return;
 165     }
 166
 167   switch (regno)
 168     {
 169     case ARM_SP_REGNUM:
 170       regcache->raw_collect (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp);
 171       break;
 172
 173     case ARM_LR_REGNUM:
 174       regcache->raw_collect (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr);
 175       break;
 176
 177     case ARM_PC_REGNUM:
 178       if (arm_apcs_32)
 179         regcache->raw_collect (ARM_PC_REGNUM,
 180                                (char *) &inferior_registers.r_pc);
 181       else
 182         {
 183           unsigned pc_val;
 184
 185           regcache->raw_collect (ARM_PC_REGNUM, (char *) &pc_val);
 186
 187           pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val);
 188           inferior_registers.r_pc ^= gdbarch_addr_bits_remove
 189                                        (gdbarch, inferior_registers.r_pc);
 190           inferior_registers.r_pc |= pc_val;
 191         }
 192       break;
 193
 194     case ARM_PS_REGNUM:
 195       if (arm_apcs_32)
 196         regcache->raw_collect (ARM_PS_REGNUM,
 197                                (char *) &inferior_registers.r_cpsr);
 198       else
 199         {
 200           unsigned psr_val;
 201
 202           regcache->raw_collect (ARM_PS_REGNUM, (char *) &psr_val);
 203
 204           psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val);
 205           inferior_registers.r_pc = gdbarch_addr_bits_remove
 206                                       (gdbarch, inferior_registers.r_pc);
 207           inferior_registers.r_pc |= psr_val;
 208         }
 209       break;
 210
 211     default:
 212       regcache->raw_collect (regno, (char *) &inferior_registers.r[regno]);
 213       break;
 214     }
 215
 216   ret = ptrace (PT_SETREGS, regcache->ptid ().pid (),
 217                 (PTRACE_TYPE_ARG3) &inferior_registers, lwp);
 218
 219   if (ret < 0)
 220     warning (_("unable to write register %d to inferior"), regno);
 221 }
 222
 223 static void
 224 store_regs (const struct regcache *regcache)
 225 {
 226   struct gdbarch *gdbarch = regcache->arch ();
 227   struct reg inferior_registers;
 228   int lwp = regcache->ptid ().lwp ();
 229   int ret;
 230   int regno;
 231
 232
 233   for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++)
 234     regcache->raw_collect (regno, (char *) &inferior_registers.r[regno]);
 235
 236   regcache->raw_collect (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp);
 237   regcache->raw_collect (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr);
 238
 239   if (arm_apcs_32)
 240     {
 241       regcache->raw_collect (ARM_PC_REGNUM, (char *) &inferior_registers.r_pc);
 242       regcache->raw_collect (ARM_PS_REGNUM,
 243                              (char *) &inferior_registers.r_cpsr);
 244     }
 245   else
 246     {
 247       unsigned pc_val;
 248       unsigned psr_val;
 249
 250       regcache->raw_collect (ARM_PC_REGNUM, (char *) &pc_val);
 251       regcache->raw_collect (ARM_PS_REGNUM, (char *) &psr_val);
 252
 253       pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val);
 254       psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val);
 255
 256       inferior_registers.r_pc = pc_val | psr_val;
 257     }
 258
 259   ret = ptrace (PT_SETREGS, regcache->ptid ().pid (),
 260                 (PTRACE_TYPE_ARG3) &inferior_registers, lwp);
 261
 262   if (ret < 0)
 263     warning (_("unable to store general registers"));
 264 }
 265
 266 static void
 267 store_fp_register (const struct regcache *regcache, int regno)
 268 {
 269   struct fpreg inferior_fp_registers;
 270   int lwp = regcache->ptid ().lwp ();
 271   int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 272                     (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
 273   struct vfpreg &vfp = inferior_fp_registers.fpr_vfp;
 274
 275   if (ret < 0)
 276     {
 277       warning (_("unable to fetch floating-point registers"));
 278       return;
 279     }
 280
 281   arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (regcache->arch ());
 282   if (regno == ARM_FPSCR_REGNUM && tdep->vfp_register_count != 0)
 283     regcache->raw_collect (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr);
 284   else if (regno >= ARM_D0_REGNUM
 285            && regno <= ARM_D0_REGNUM + tdep->vfp_register_count)
 286     {
 287       regcache->raw_collect (regno,
 288                              (char *) &vfp.vfp_regs[regno - ARM_D0_REGNUM]);
 289     }
 290   else
 291     warning (_("Invalid register number."));
 292
 293   ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 294                 (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp);
 295
 296   if (ret < 0)
 297     warning (_("unable to write register %d to inferior"), regno);
 298 }
 299
 300 static void
 301 store_fp_regs (const struct regcache *regcache)
 302 {
 303   arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (regcache->arch ());
 304   int lwp = regcache->ptid ().lwp ();
 305   if (tdep->vfp_register_count == 0)
 306     return;
 307
 308   struct fpreg fpregs;
 309   for (int regno = 0; regno <= tdep->vfp_register_count; regno++)
 310     regcache->raw_collect
 311       (regno + ARM_D0_REGNUM, (char *) &fpregs.fpr_vfp.vfp_regs[regno]);
 312
 313   regcache->raw_collect (ARM_FPSCR_REGNUM,
 314                          (char *) &fpregs.fpr_vfp.vfp_fpscr);
 315
 316   int ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 317                     (PTRACE_TYPE_ARG3) &fpregs, lwp);
 318
 319   if (ret < 0)
 320     warning (_("unable to store floating-point registers"));
 321 }
 322
 323 void
 324 arm_netbsd_nat_target::store_registers (struct regcache *regcache, int regno)
 325 {
 326   if (regno >= 0)
 327     {
 328       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 329         store_register (regcache, regno);
 330       else
 331         store_fp_register (regcache, regno);
 332     }
 333   else
 334     {
 335       store_regs (regcache);
 336       store_fp_regs (regcache);
 337     }
 338 }
 339
 340 const struct target_desc *
 341 arm_netbsd_nat_target::read_description ()
 342 {
 343   int flag;
 344   size_t len = sizeof (flag);
 345
 346   if (sysctlbyname("machdep.fpu_present", &flag, &len, NULL, 0) != 0
 347       || !flag)
 348     return arm_read_description (ARM_FP_TYPE_NONE, false);
 349
 350   len = sizeof(flag);
 351   if (sysctlbyname("machdep.neon_present", &flag, &len, NULL, 0) == 0 && flag)
 352     return aarch32_read_description (false);
 353
 354   return arm_read_description (ARM_FP_TYPE_VFPV3, false);
 355 }
 356
 357 void _initialize_arm_netbsd_nat ();
 358 void
 359 _initialize_arm_netbsd_nat ()
 360 {
 361   add_inf_child_target (&the_arm_netbsd_nat_target);
 362 }