gdbserver/linux-ia64-low.cc

   1 /* GNU/Linux/IA64 specific low level interface, for the remote server for GDB.
   2    Copyright (C) 1995-2024 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 "linux-low.h"
  20
  21 #ifdef HAVE_SYS_REG_H
  22 #include <sys/reg.h>
  23 #endif
  24
  25 /* Linux target op definitions for the IA64 architecture.  */
  26
  27 class ia64_target : public linux_process_target
  28 {
  29 public:
  30
  31   const regs_info *get_regs_info () override;
  32
  33   const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
  34
  35 protected:
  36
  37   void low_arch_setup () override;
  38
  39   bool low_cannot_fetch_register (int regno) override;
  40
  41   bool low_cannot_store_register (int regno) override;
  42
  43   bool low_fetch_register (regcache *regcache, int regno) override;
  44
  45   bool low_breakpoint_at (CORE_ADDR pc) override;
  46 };
  47
  48 /* The singleton target ops object.  */
  49
  50 static ia64_target the_ia64_target;
  51
  52 const gdb_byte *
  53 ia64_target::sw_breakpoint_from_kind (int kind, int *size)
  54 {
  55   gdb_assert_not_reached ("target op sw_breakpoint_from_kind is not "
  56                           "implemented by this target");
  57 }
  58
  59 bool
  60 ia64_target::low_breakpoint_at (CORE_ADDR pc)
  61 {
  62   gdb_assert_not_reached ("linux target op low_breakpoint_at is not "
  63                           "implemented by this target");
  64 }
  65
  66 /* Defined in auto-generated file reg-ia64.c.  */
  67 void init_registers_ia64 (void);
  68 extern const struct target_desc *tdesc_ia64;
  69
  70 #define ia64_num_regs 462
  71
  72 #include <asm/ptrace_offsets.h>
  73
  74 static int ia64_regmap[] =
  75   {
  76     /* general registers */
  77     -1,         /* gr0 not available; i.e, it's always zero */
  78     PT_R1,
  79     PT_R2,
  80     PT_R3,
  81     PT_R4,
  82     PT_R5,
  83     PT_R6,
  84     PT_R7,
  85     PT_R8,
  86     PT_R9,
  87     PT_R10,
  88     PT_R11,
  89     PT_R12,
  90     PT_R13,
  91     PT_R14,
  92     PT_R15,
  93     PT_R16,
  94     PT_R17,
  95     PT_R18,
  96     PT_R19,
  97     PT_R20,
  98     PT_R21,
  99     PT_R22,
 100     PT_R23,
 101     PT_R24,
 102     PT_R25,
 103     PT_R26,
 104     PT_R27,
 105     PT_R28,
 106     PT_R29,
 107     PT_R30,
 108     PT_R31,
 109     /* gr32 through gr127 not directly available via the ptrace interface */
 110     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 111     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 112     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 113     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 114     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 115     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 116     /* Floating point registers */
 117     -1, -1,     /* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */
 118     PT_F2,
 119     PT_F3,
 120     PT_F4,
 121     PT_F5,
 122     PT_F6,
 123     PT_F7,
 124     PT_F8,
 125     PT_F9,
 126     PT_F10,
 127     PT_F11,
 128     PT_F12,
 129     PT_F13,
 130     PT_F14,
 131     PT_F15,
 132     PT_F16,
 133     PT_F17,
 134     PT_F18,
 135     PT_F19,
 136     PT_F20,
 137     PT_F21,
 138     PT_F22,
 139     PT_F23,
 140     PT_F24,
 141     PT_F25,
 142     PT_F26,
 143     PT_F27,
 144     PT_F28,
 145     PT_F29,
 146     PT_F30,
 147     PT_F31,
 148     PT_F32,
 149     PT_F33,
 150     PT_F34,
 151     PT_F35,
 152     PT_F36,
 153     PT_F37,
 154     PT_F38,
 155     PT_F39,
 156     PT_F40,
 157     PT_F41,
 158     PT_F42,
 159     PT_F43,
 160     PT_F44,
 161     PT_F45,
 162     PT_F46,
 163     PT_F47,
 164     PT_F48,
 165     PT_F49,
 166     PT_F50,
 167     PT_F51,
 168     PT_F52,
 169     PT_F53,
 170     PT_F54,
 171     PT_F55,
 172     PT_F56,
 173     PT_F57,
 174     PT_F58,
 175     PT_F59,
 176     PT_F60,
 177     PT_F61,
 178     PT_F62,
 179     PT_F63,
 180     PT_F64,
 181     PT_F65,
 182     PT_F66,
 183     PT_F67,
 184     PT_F68,
 185     PT_F69,
 186     PT_F70,
 187     PT_F71,
 188     PT_F72,
 189     PT_F73,
 190     PT_F74,
 191     PT_F75,
 192     PT_F76,
 193     PT_F77,
 194     PT_F78,
 195     PT_F79,
 196     PT_F80,
 197     PT_F81,
 198     PT_F82,
 199     PT_F83,
 200     PT_F84,
 201     PT_F85,
 202     PT_F86,
 203     PT_F87,
 204     PT_F88,
 205     PT_F89,
 206     PT_F90,
 207     PT_F91,
 208     PT_F92,
 209     PT_F93,
 210     PT_F94,
 211     PT_F95,
 212     PT_F96,
 213     PT_F97,
 214     PT_F98,
 215     PT_F99,
 216     PT_F100,
 217     PT_F101,
 218     PT_F102,
 219     PT_F103,
 220     PT_F104,
 221     PT_F105,
 222     PT_F106,
 223     PT_F107,
 224     PT_F108,
 225     PT_F109,
 226     PT_F110,
 227     PT_F111,
 228     PT_F112,
 229     PT_F113,
 230     PT_F114,
 231     PT_F115,
 232     PT_F116,
 233     PT_F117,
 234     PT_F118,
 235     PT_F119,
 236     PT_F120,
 237     PT_F121,
 238     PT_F122,
 239     PT_F123,
 240     PT_F124,
 241     PT_F125,
 242     PT_F126,
 243     PT_F127,
 244     /* predicate registers - we don't fetch these individually */
 245     -1, -1, -1, -1, -1, -1, -1, -1,
 246     -1, -1, -1, -1, -1, -1, -1, -1,
 247     -1, -1, -1, -1, -1, -1, -1, -1,
 248     -1, -1, -1, -1, -1, -1, -1, -1,
 249     -1, -1, -1, -1, -1, -1, -1, -1,
 250     -1, -1, -1, -1, -1, -1, -1, -1,
 251     -1, -1, -1, -1, -1, -1, -1, -1,
 252     -1, -1, -1, -1, -1, -1, -1, -1,
 253     /* branch registers */
 254     PT_B0,
 255     PT_B1,
 256     PT_B2,
 257     PT_B3,
 258     PT_B4,
 259     PT_B5,
 260     PT_B6,
 261     PT_B7,
 262     /* virtual frame pointer and virtual return address pointer */
 263     -1, -1,
 264     /* other registers */
 265     PT_PR,
 266     PT_CR_IIP,  /* ip */
 267     PT_CR_IPSR, /* psr */
 268     PT_CFM,     /* cfm */
 269     /* kernel registers not visible via ptrace interface (?) */
 270     -1, -1, -1, -1, -1, -1, -1, -1,
 271     /* hole */
 272     -1, -1, -1, -1, -1, -1, -1, -1,
 273     PT_AR_RSC,
 274     PT_AR_BSP,
 275     PT_AR_BSPSTORE,
 276     PT_AR_RNAT,
 277     -1,
 278     -1,         /* Not available: FCR, IA32 floating control register */
 279     -1, -1,
 280     -1,         /* Not available: EFLAG */
 281     -1,         /* Not available: CSD */
 282     -1,         /* Not available: SSD */
 283     -1,         /* Not available: CFLG */
 284     -1,         /* Not available: FSR */
 285     -1,         /* Not available: FIR */
 286     -1,         /* Not available: FDR */
 287     -1,
 288     PT_AR_CCV,
 289     -1, -1, -1,
 290     PT_AR_UNAT,
 291     -1, -1, -1,
 292     PT_AR_FPSR,
 293     -1, -1, -1,
 294     -1,         /* Not available: ITC */
 295     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 296     -1, -1, -1, -1, -1, -1, -1, -1, -1,
 297     PT_AR_PFS,
 298     PT_AR_LC,
 299     PT_AR_EC,
 300     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 301     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 302     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 303     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 304     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 305     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 306     -1,
 307   };
 308
 309 bool
 310 ia64_target::low_cannot_store_register (int regno)
 311 {
 312   return false;
 313 }
 314
 315 bool
 316 ia64_target::low_cannot_fetch_register (int regno)
 317 {
 318   return false;
 319 }
 320
 321 /* GDB register numbers.  */
 322 #define IA64_GR0_REGNUM         0
 323 #define IA64_FR0_REGNUM         128
 324 #define IA64_FR1_REGNUM         129
 325
 326 bool
 327 ia64_target::low_fetch_register (regcache *regcache, int regnum)
 328 {
 329   /* r0 cannot be fetched but is always zero.  */
 330   if (regnum == IA64_GR0_REGNUM)
 331     {
 332       const gdb_byte zero[8] = { 0 };
 333
 334       gdb_assert (sizeof (zero) == register_size (regcache->tdesc, regnum));
 335       supply_register (regcache, regnum, zero);
 336       return true;
 337     }
 338
 339   /* fr0 cannot be fetched but is always zero.  */
 340   if (regnum == IA64_FR0_REGNUM)
 341     {
 342       const gdb_byte f_zero[16] = { 0 };
 343
 344       gdb_assert (sizeof (f_zero) == register_size (regcache->tdesc, regnum));
 345       supply_register (regcache, regnum, f_zero);
 346       return true;
 347     }
 348
 349   /* fr1 cannot be fetched but is always one (1.0).  */
 350   if (regnum == IA64_FR1_REGNUM)
 351     {
 352       const gdb_byte f_one[16] =
 353         { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
 354
 355       gdb_assert (sizeof (f_one) == register_size (regcache->tdesc, regnum));
 356       supply_register (regcache, regnum, f_one);
 357       return true;
 358     }
 359
 360   return false;
 361 }
 362
 363 static struct usrregs_info ia64_usrregs_info =
 364   {
 365     ia64_num_regs,
 366     ia64_regmap,
 367   };
 368
 369 static struct regs_info myregs_info =
 370   {
 371     NULL, /* regset_bitmap */
 372     &ia64_usrregs_info
 373   };
 374
 375 const regs_info *
 376 ia64_target::get_regs_info ()
 377 {
 378   return &myregs_info;
 379 }
 380
 381 void
 382 ia64_target::low_arch_setup ()
 383 {
 384   current_process ()->tdesc = tdesc_ia64;
 385 }
 386
 387 /* The linux target ops object.  */
 388
 389 linux_process_target *the_linux_target = &the_ia64_target;
 390
 391 void
 392 initialize_low_arch (void)
 393 {
 394   init_registers_ia64 ();
 395 }