gdbserver/linux-ia64-low.cc

   1 /* GNU/Linux/IA64 specific low level interface, for the remote server for GDB.
   2    Copyright (C) 1995-2020 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "server.h"
  20 #include "linux-low.h"
  21
  22 #ifdef HAVE_SYS_REG_H
  23 #include <sys/reg.h>
  24 #endif
  25
  26 /* Linux target op definitions for the IA64 architecture.  */
  27
  28 class ia64_target : public linux_process_target
  29 {
  30 public:
  31
  32   const regs_info *get_regs_info () override;
  33
  34   const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
  35
  36 protected:
  37
  38   void low_arch_setup () override;
  39
  40   bool low_cannot_fetch_register (int regno) override;
  41
  42   bool low_cannot_store_register (int regno) override;
  43
  44   bool low_fetch_register (regcache *regcache, int regno) override;
  45 };
  46
  47 /* The singleton target ops object.  */
  48
  49 static ia64_target the_ia64_target;
  50
  51 const gdb_byte *
  52 ia64_target::sw_breakpoint_from_kind (int kind, int *size)
  53 {
  54   gdb_assert_no_reached ("target op sw_breakpoint_from_kind is not "
  55                          "implemented by this target");
  56 }
  57
  58 /* Defined in auto-generated file reg-ia64.c.  */
  59 void init_registers_ia64 (void);
  60 extern const struct target_desc *tdesc_ia64;
  61
  62 #define ia64_num_regs 462
  63
  64 #include <asm/ptrace_offsets.h>
  65
  66 static int ia64_regmap[] =
  67   {
  68     /* general registers */
  69     -1,         /* gr0 not available; i.e, it's always zero */
  70     PT_R1,
  71     PT_R2,
  72     PT_R3,
  73     PT_R4,
  74     PT_R5,
  75     PT_R6,
  76     PT_R7,
  77     PT_R8,
  78     PT_R9,
  79     PT_R10,
  80     PT_R11,
  81     PT_R12,
  82     PT_R13,
  83     PT_R14,
  84     PT_R15,
  85     PT_R16,
  86     PT_R17,
  87     PT_R18,
  88     PT_R19,
  89     PT_R20,
  90     PT_R21,
  91     PT_R22,
  92     PT_R23,
  93     PT_R24,
  94     PT_R25,
  95     PT_R26,
  96     PT_R27,
  97     PT_R28,
  98     PT_R29,
  99     PT_R30,
 100     PT_R31,
 101     /* gr32 through gr127 not directly available via the ptrace interface */
 102     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 103     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 104     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 105     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 106     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 107     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 108     /* Floating point registers */
 109     -1, -1,     /* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */
 110     PT_F2,
 111     PT_F3,
 112     PT_F4,
 113     PT_F5,
 114     PT_F6,
 115     PT_F7,
 116     PT_F8,
 117     PT_F9,
 118     PT_F10,
 119     PT_F11,
 120     PT_F12,
 121     PT_F13,
 122     PT_F14,
 123     PT_F15,
 124     PT_F16,
 125     PT_F17,
 126     PT_F18,
 127     PT_F19,
 128     PT_F20,
 129     PT_F21,
 130     PT_F22,
 131     PT_F23,
 132     PT_F24,
 133     PT_F25,
 134     PT_F26,
 135     PT_F27,
 136     PT_F28,
 137     PT_F29,
 138     PT_F30,
 139     PT_F31,
 140     PT_F32,
 141     PT_F33,
 142     PT_F34,
 143     PT_F35,
 144     PT_F36,
 145     PT_F37,
 146     PT_F38,
 147     PT_F39,
 148     PT_F40,
 149     PT_F41,
 150     PT_F42,
 151     PT_F43,
 152     PT_F44,
 153     PT_F45,
 154     PT_F46,
 155     PT_F47,
 156     PT_F48,
 157     PT_F49,
 158     PT_F50,
 159     PT_F51,
 160     PT_F52,
 161     PT_F53,
 162     PT_F54,
 163     PT_F55,
 164     PT_F56,
 165     PT_F57,
 166     PT_F58,
 167     PT_F59,
 168     PT_F60,
 169     PT_F61,
 170     PT_F62,
 171     PT_F63,
 172     PT_F64,
 173     PT_F65,
 174     PT_F66,
 175     PT_F67,
 176     PT_F68,
 177     PT_F69,
 178     PT_F70,
 179     PT_F71,
 180     PT_F72,
 181     PT_F73,
 182     PT_F74,
 183     PT_F75,
 184     PT_F76,
 185     PT_F77,
 186     PT_F78,
 187     PT_F79,
 188     PT_F80,
 189     PT_F81,
 190     PT_F82,
 191     PT_F83,
 192     PT_F84,
 193     PT_F85,
 194     PT_F86,
 195     PT_F87,
 196     PT_F88,
 197     PT_F89,
 198     PT_F90,
 199     PT_F91,
 200     PT_F92,
 201     PT_F93,
 202     PT_F94,
 203     PT_F95,
 204     PT_F96,
 205     PT_F97,
 206     PT_F98,
 207     PT_F99,
 208     PT_F100,
 209     PT_F101,
 210     PT_F102,
 211     PT_F103,
 212     PT_F104,
 213     PT_F105,
 214     PT_F106,
 215     PT_F107,
 216     PT_F108,
 217     PT_F109,
 218     PT_F110,
 219     PT_F111,
 220     PT_F112,
 221     PT_F113,
 222     PT_F114,
 223     PT_F115,
 224     PT_F116,
 225     PT_F117,
 226     PT_F118,
 227     PT_F119,
 228     PT_F120,
 229     PT_F121,
 230     PT_F122,
 231     PT_F123,
 232     PT_F124,
 233     PT_F125,
 234     PT_F126,
 235     PT_F127,
 236     /* predicate registers - we don't fetch these individually */
 237     -1, -1, -1, -1, -1, -1, -1, -1,
 238     -1, -1, -1, -1, -1, -1, -1, -1,
 239     -1, -1, -1, -1, -1, -1, -1, -1,
 240     -1, -1, -1, -1, -1, -1, -1, -1,
 241     -1, -1, -1, -1, -1, -1, -1, -1,
 242     -1, -1, -1, -1, -1, -1, -1, -1,
 243     -1, -1, -1, -1, -1, -1, -1, -1,
 244     -1, -1, -1, -1, -1, -1, -1, -1,
 245     /* branch registers */
 246     PT_B0,
 247     PT_B1,
 248     PT_B2,
 249     PT_B3,
 250     PT_B4,
 251     PT_B5,
 252     PT_B6,
 253     PT_B7,
 254     /* virtual frame pointer and virtual return address pointer */
 255     -1, -1,
 256     /* other registers */
 257     PT_PR,
 258     PT_CR_IIP,  /* ip */
 259     PT_CR_IPSR, /* psr */
 260     PT_CFM,     /* cfm */
 261     /* kernel registers not visible via ptrace interface (?) */
 262     -1, -1, -1, -1, -1, -1, -1, -1,
 263     /* hole */
 264     -1, -1, -1, -1, -1, -1, -1, -1,
 265     PT_AR_RSC,
 266     PT_AR_BSP,
 267     PT_AR_BSPSTORE,
 268     PT_AR_RNAT,
 269     -1,
 270     -1,         /* Not available: FCR, IA32 floating control register */
 271     -1, -1,
 272     -1,         /* Not available: EFLAG */
 273     -1,         /* Not available: CSD */
 274     -1,         /* Not available: SSD */
 275     -1,         /* Not available: CFLG */
 276     -1,         /* Not available: FSR */
 277     -1,         /* Not available: FIR */
 278     -1,         /* Not available: FDR */
 279     -1,
 280     PT_AR_CCV,
 281     -1, -1, -1,
 282     PT_AR_UNAT,
 283     -1, -1, -1,
 284     PT_AR_FPSR,
 285     -1, -1, -1,
 286     -1,         /* Not available: ITC */
 287     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 288     -1, -1, -1, -1, -1, -1, -1, -1, -1,
 289     PT_AR_PFS,
 290     PT_AR_LC,
 291     PT_AR_EC,
 292     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 293     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 294     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 295     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 296     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 297     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 298     -1,
 299   };
 300
 301 bool
 302 ia64_target::low_cannot_store_register (int regno)
 303 {
 304   return false;
 305 }
 306
 307 bool
 308 ia64_target::low_cannot_fetch_register (int regno)
 309 {
 310   return false;
 311 }
 312
 313 /* GDB register numbers.  */
 314 #define IA64_GR0_REGNUM         0
 315 #define IA64_FR0_REGNUM         128
 316 #define IA64_FR1_REGNUM         129
 317
 318 bool
 319 ia64_target::low_fetch_register (regcache *regcache, int regnum)
 320 {
 321   /* r0 cannot be fetched but is always zero.  */
 322   if (regnum == IA64_GR0_REGNUM)
 323     {
 324       const gdb_byte zero[8] = { 0 };
 325
 326       gdb_assert (sizeof (zero) == register_size (regcache->tdesc, regnum));
 327       supply_register (regcache, regnum, zero);
 328       return true;
 329     }
 330
 331   /* fr0 cannot be fetched but is always zero.  */
 332   if (regnum == IA64_FR0_REGNUM)
 333     {
 334       const gdb_byte f_zero[16] = { 0 };
 335
 336       gdb_assert (sizeof (f_zero) == register_size (regcache->tdesc, regnum));
 337       supply_register (regcache, regnum, f_zero);
 338       return true;
 339     }
 340
 341   /* fr1 cannot be fetched but is always one (1.0).  */
 342   if (regnum == IA64_FR1_REGNUM)
 343     {
 344       const gdb_byte f_one[16] =
 345         { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
 346
 347       gdb_assert (sizeof (f_one) == register_size (regcache->tdesc, regnum));
 348       supply_register (regcache, regnum, f_one);
 349       return true;
 350     }
 351
 352   return false;
 353 }
 354
 355 static struct usrregs_info ia64_usrregs_info =
 356   {
 357     ia64_num_regs,
 358     ia64_regmap,
 359   };
 360
 361 static struct regs_info myregs_info =
 362   {
 363     NULL, /* regset_bitmap */
 364     &ia64_usrregs_info
 365   };
 366
 367 const regs_info *
 368 ia64_target::get_regs_info ()
 369 {
 370   return &myregs_info;
 371 }
 372
 373 void
 374 ia64_target::low_arch_setup ()
 375 {
 376   current_process ()->tdesc = tdesc_ia64;
 377 }
 378
 379
 380 struct linux_target_ops the_low_target = {
 381 };
 382
 383 /* The linux target ops object.  */
 384
 385 linux_process_target *the_linux_target = &the_ia64_target;
 386
 387 void
 388 initialize_low_arch (void)
 389 {
 390   init_registers_ia64 ();
 391 }