gdb/i386-tdep.h

   1 /* Target-dependent code for the i386.
   2
   3    Copyright (C) 2001-2019 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 #ifndef I386_TDEP_H
  21 #define I386_TDEP_H
  22
  23 #include "infrun.h"
  24
  25 struct frame_info;
  26 struct gdbarch;
  27 struct reggroup;
  28 struct regset;
  29 struct regcache;
  30
  31 /* GDB's i386 target supports both the 32-bit Intel Architecture
  32    (IA-32) and the 64-bit AMD x86-64 architecture.  Internally it uses
  33    a similar register layout for both.
  34
  35    - General purpose registers
  36    - FPU data registers
  37    - FPU control registers
  38    - SSE data registers
  39    - SSE control register
  40
  41    The general purpose registers for the x86-64 architecture are quite
  42    different from IA-32.  Therefore, gdbarch_fp0_regnum
  43    determines the register number at which the FPU data registers
  44    start.  The number of FPU data and control registers is the same
  45    for both architectures.  The number of SSE registers however,
  46    differs and is determined by the num_xmm_regs member of `struct
  47    gdbarch_tdep'.  */
  48
  49 /* Convention for returning structures.  */
  50
  51 enum struct_return
  52 {
  53   pcc_struct_return,            /* Return "short" structures in memory.  */
  54   reg_struct_return             /* Return "short" structures in registers.  */
  55 };
  56
  57 /* i386 architecture specific information.  */
  58 struct gdbarch_tdep
  59 {
  60   /* General-purpose registers.  */
  61   int *gregset_reg_offset;
  62   int gregset_num_regs;
  63   size_t sizeof_gregset;
  64
  65   /* Floating-point registers.  */
  66   size_t sizeof_fpregset;
  67
  68   /* Register number for %st(0).  The register numbers for the other
  69      registers follow from this one.  Set this to -1 to indicate the
  70      absence of an FPU.  */
  71   int st0_regnum;
  72
  73   /* Number of MMX registers.  */
  74   int num_mmx_regs;
  75
  76   /* Register number for %mm0.  Set this to -1 to indicate the absence
  77      of MMX support.  */
  78   int mm0_regnum;
  79
  80   /* Number of pseudo YMM registers.  */
  81   int num_ymm_regs;
  82
  83   /* Register number for %ymm0.  Set this to -1 to indicate the absence
  84      of pseudo YMM register support.  */
  85   int ymm0_regnum;
  86
  87   /* Number of AVX512 OpMask registers (K-registers)  */
  88   int num_k_regs;
  89
  90   /* Register number for %k0.  Set this to -1 to indicate the absence
  91      of AVX512 OpMask register support.  */
  92   int k0_regnum;
  93
  94   /* Number of pseudo ZMM registers ($zmm0-$zmm31).  */
  95   int num_zmm_regs;
  96
  97   /* Register number for %zmm0.  Set this to -1 to indicate the absence
  98      of pseudo ZMM register support.  */
  99   int zmm0_regnum;
 100
 101   /* Number of byte registers.  */
 102   int num_byte_regs;
 103
 104   /* Register pseudo number for %al.  */
 105   int al_regnum;
 106
 107   /* Number of pseudo word registers.  */
 108   int num_word_regs;
 109
 110   /* Register number for %ax.  */
 111   int ax_regnum;
 112
 113   /* Number of pseudo dword registers.  */
 114   int num_dword_regs;
 115
 116   /* Register number for %eax.  Set this to -1 to indicate the absence
 117      of pseudo dword register support.  */
 118   int eax_regnum;
 119
 120   /* Number of core registers.  */
 121   int num_core_regs;
 122
 123   /* Number of SSE registers.  */
 124   int num_xmm_regs;
 125
 126   /* Number of SSE registers added in AVX512.  */
 127   int num_xmm_avx512_regs;
 128
 129   /* Register number of XMM16, the first XMM register added in AVX512.  */
 130   int xmm16_regnum;
 131
 132   /* Number of YMM registers added in AVX512.  */
 133   int num_ymm_avx512_regs;
 134
 135   /* Register number of YMM16, the first YMM register added in AVX512.  */
 136   int ymm16_regnum;
 137
 138   /* Bits of the extended control register 0 (the XFEATURE_ENABLED_MASK
 139      register), excluding the x87 bit, which are supported by this GDB.  */
 140
 141   uint64_t xcr0;
 142
 143   /* Offset of XCR0 in XSAVE extended state.  */
 144   int xsave_xcr0_offset;
 145
 146   /* Register names.  */
 147   const char **register_names;
 148
 149   /* Register number for %ymm0h.  Set this to -1 to indicate the absence
 150      of upper YMM register support.  */
 151   int ymm0h_regnum;
 152
 153   /* Upper YMM register names.  Only used for tdesc_numbered_register.  */
 154   const char **ymmh_register_names;
 155
 156   /* Register number for %ymm16h.  Set this to -1 to indicate the absence
 157   of support for YMM16-31.  */
 158   int ymm16h_regnum;
 159
 160   /* YMM16-31 register names.  Only used for tdesc_numbered_register.  */
 161   const char **ymm16h_register_names;
 162
 163   /* Register number for %bnd0r.  Set this to -1 to indicate the absence
 164      bound registers.  */
 165   int bnd0r_regnum;
 166
 167   /* Register number for pseudo register %bnd0.  Set this to -1 to indicate the absence
 168      bound registers.  */
 169   int bnd0_regnum;
 170
 171   /* Register number for %bndcfgu. Set this to -1 to indicate the absence
 172      bound control registers.  */
 173   int bndcfgu_regnum;
 174
 175   /* MPX register names.  Only used for tdesc_numbered_register.  */
 176   const char **mpx_register_names;
 177
 178   /* Register number for %zmm0h.  Set this to -1 to indicate the absence
 179      of ZMM_HI256 register support.  */
 180   int zmm0h_regnum;
 181
 182   /* OpMask register names.  */
 183   const char **k_register_names;
 184
 185   /* ZMM register names.  Only used for tdesc_numbered_register.  */
 186   const char **zmmh_register_names;
 187
 188   /* XMM16-31 register names.  Only used for tdesc_numbered_register.  */
 189   const char **xmm_avx512_register_names;
 190
 191   /* YMM16-31 register names.  Only used for tdesc_numbered_register.  */
 192   const char **ymm_avx512_register_names;
 193
 194   /* Number of PKEYS registers.  */
 195   int num_pkeys_regs;
 196
 197   /* Register number for PKRU register.  */
 198   int pkru_regnum;
 199
 200   /* PKEYS register names.  */
 201   const char **pkeys_register_names;
 202
 203   /* Register number for %fsbase.  Set this to -1 to indicate the
 204      absence of segment base registers.  */
 205   int fsbase_regnum;
 206
 207   /* Target description.  */
 208   const struct target_desc *tdesc;
 209
 210   /* Register group function.  */
 211   gdbarch_register_reggroup_p_ftype *register_reggroup_p;
 212
 213   /* Offset of saved PC in jmp_buf.  */
 214   int jb_pc_offset;
 215
 216   /* Convention for returning structures.  */
 217   enum struct_return struct_return;
 218
 219   /* Address range where sigtramp lives.  */
 220   CORE_ADDR sigtramp_start;
 221   CORE_ADDR sigtramp_end;
 222
 223   /* Detect sigtramp.  */
 224   int (*sigtramp_p) (struct frame_info *);
 225
 226   /* Get address of sigcontext for sigtramp.  */
 227   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
 228
 229   /* Offset of registers in `struct sigcontext'.  */
 230   int *sc_reg_offset;
 231   int sc_num_regs;
 232
 233   /* Offset of saved PC and SP in `struct sigcontext'.  Usage of these
 234      is deprecated, please use `sc_reg_offset' instead.  */
 235   int sc_pc_offset;
 236   int sc_sp_offset;
 237
 238   /* ISA-specific data types.  */
 239   struct type *i386_mmx_type;
 240   struct type *i386_ymm_type;
 241   struct type *i386_zmm_type;
 242   struct type *i387_ext_type;
 243   struct type *i386_bnd_type;
 244
 245   /* Process record/replay target.  */
 246   /* The map for registers because the AMD64's registers order
 247      in GDB is not same as I386 instructions.  */
 248   const int *record_regmap;
 249   /* Parse intx80 args.  */
 250   int (*i386_intx80_record) (struct regcache *regcache);
 251   /* Parse sysenter args.  */
 252   int (*i386_sysenter_record) (struct regcache *regcache);
 253   /* Parse syscall args.  */
 254   int (*i386_syscall_record) (struct regcache *regcache);
 255
 256   /* Regsets. */
 257   const struct regset *fpregset;
 258 };
 259
 260 /* Floating-point registers.  */
 261
 262 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
 263    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
 264    register cache.  */
 265
 266 /* Return non-zero if REGNUM matches the FP register and the FP
 267    register set is active.  */
 268 extern int i386_fp_regnum_p (struct gdbarch *, int);
 269 extern int i386_fpc_regnum_p (struct gdbarch *, int);
 270
 271 /* Register numbers of various important registers.  */
 272
 273 enum i386_regnum
 274 {
 275   I386_EAX_REGNUM,              /* %eax */
 276   I386_ECX_REGNUM,              /* %ecx */
 277   I386_EDX_REGNUM,              /* %edx */
 278   I386_EBX_REGNUM,              /* %ebx */
 279   I386_ESP_REGNUM,              /* %esp */
 280   I386_EBP_REGNUM,              /* %ebp */
 281   I386_ESI_REGNUM,              /* %esi */
 282   I386_EDI_REGNUM,              /* %edi */
 283   I386_EIP_REGNUM,              /* %eip */
 284   I386_EFLAGS_REGNUM,           /* %eflags */
 285   I386_CS_REGNUM,               /* %cs */
 286   I386_SS_REGNUM,               /* %ss */
 287   I386_DS_REGNUM,               /* %ds */
 288   I386_ES_REGNUM,               /* %es */
 289   I386_FS_REGNUM,               /* %fs */
 290   I386_GS_REGNUM,               /* %gs */
 291   I386_ST0_REGNUM,              /* %st(0) */
 292   I386_MXCSR_REGNUM = 40,       /* %mxcsr */
 293   I386_YMM0H_REGNUM,            /* %ymm0h */
 294   I386_YMM7H_REGNUM = I386_YMM0H_REGNUM + 7,
 295   I386_BND0R_REGNUM,
 296   I386_BND3R_REGNUM = I386_BND0R_REGNUM + 3,
 297   I386_BNDCFGU_REGNUM,
 298   I386_BNDSTATUS_REGNUM,
 299   I386_K0_REGNUM,               /* %k0 */
 300   I386_K7_REGNUM = I386_K0_REGNUM + 7,
 301   I386_ZMM0H_REGNUM,            /* %zmm0h */
 302   I386_ZMM7H_REGNUM = I386_ZMM0H_REGNUM + 7,
 303   I386_PKRU_REGNUM,
 304   I386_FSBASE_REGNUM,
 305   I386_GSBASE_REGNUM
 306 };
 307
 308 /* Register numbers of RECORD_REGMAP.  */
 309
 310 enum record_i386_regnum
 311 {
 312   X86_RECORD_REAX_REGNUM,
 313   X86_RECORD_RECX_REGNUM,
 314   X86_RECORD_REDX_REGNUM,
 315   X86_RECORD_REBX_REGNUM,
 316   X86_RECORD_RESP_REGNUM,
 317   X86_RECORD_REBP_REGNUM,
 318   X86_RECORD_RESI_REGNUM,
 319   X86_RECORD_REDI_REGNUM,
 320   X86_RECORD_R8_REGNUM,
 321   X86_RECORD_R9_REGNUM,
 322   X86_RECORD_R10_REGNUM,
 323   X86_RECORD_R11_REGNUM,
 324   X86_RECORD_R12_REGNUM,
 325   X86_RECORD_R13_REGNUM,
 326   X86_RECORD_R14_REGNUM,
 327   X86_RECORD_R15_REGNUM,
 328   X86_RECORD_REIP_REGNUM,
 329   X86_RECORD_EFLAGS_REGNUM,
 330   X86_RECORD_CS_REGNUM,
 331   X86_RECORD_SS_REGNUM,
 332   X86_RECORD_DS_REGNUM,
 333   X86_RECORD_ES_REGNUM,
 334   X86_RECORD_FS_REGNUM,
 335   X86_RECORD_GS_REGNUM,
 336 };
 337
 338 #define I386_NUM_GREGS  16
 339 #define I386_NUM_XREGS  9
 340
 341 #define I386_SSE_NUM_REGS       (I386_MXCSR_REGNUM + 1)
 342 #define I386_AVX_NUM_REGS       (I386_YMM7H_REGNUM + 1)
 343 #define I386_MPX_NUM_REGS       (I386_BNDSTATUS_REGNUM + 1)
 344 #define I386_AVX512_NUM_REGS    (I386_ZMM7H_REGNUM + 1)
 345 #define I386_PKEYS_NUM_REGS     (I386_PKRU_REGNUM + 1)
 346 #define I386_NUM_REGS           (I386_GSBASE_REGNUM + 1)
 347
 348 /* Size of the largest register.  */
 349 #define I386_MAX_REGISTER_SIZE  64
 350
 351 /* Types for i386-specific registers.  */
 352 extern struct type *i387_ext_type (struct gdbarch *gdbarch);
 353
 354 /* Checks of different pseudo-registers.  */
 355 extern int i386_byte_regnum_p (struct gdbarch *gdbarch, int regnum);
 356 extern int i386_word_regnum_p (struct gdbarch *gdbarch, int regnum);
 357 extern int i386_dword_regnum_p (struct gdbarch *gdbarch, int regnum);
 358 extern int i386_xmm_regnum_p (struct gdbarch *gdbarch, int regnum);
 359 extern int i386_xmm_avx512_regnum_p (struct gdbarch * gdbarch, int regnum);
 360 extern int i386_ymm_regnum_p (struct gdbarch *gdbarch, int regnum);
 361 extern int i386_ymm_avx512_regnum_p (struct gdbarch *gdbarch, int regnum);
 362 extern int i386_bnd_regnum_p (struct gdbarch *gdbarch, int regnum);
 363 extern int i386_k_regnum_p (struct gdbarch *gdbarch, int regnum);
 364 extern int i386_zmm_regnum_p (struct gdbarch *gdbarch, int regnum);
 365 extern int i386_zmmh_regnum_p (struct gdbarch *gdbarch, int regnum);
 366 extern bool i386_pkru_regnum_p (struct gdbarch *gdbarch, int regnum);
 367
 368 extern const char *i386_pseudo_register_name (struct gdbarch *gdbarch,
 369                                               int regnum);
 370 extern struct type *i386_pseudo_register_type (struct gdbarch *gdbarch,
 371                                                int regnum);
 372
 373 extern void i386_pseudo_register_read_into_value (struct gdbarch *gdbarch,
 374                                                   readable_regcache *regcache,
 375                                                   int regnum,
 376                                                   struct value *result);
 377
 378 extern void i386_pseudo_register_write (struct gdbarch *gdbarch,
 379                                         struct regcache *regcache,
 380                                         int regnum, const gdb_byte *buf);
 381
 382 extern int i386_ax_pseudo_register_collect (struct gdbarch *gdbarch,
 383                                             struct agent_expr *ax,
 384                                             int regnum);
 385
 386 /* Segment selectors.  */
 387 #define I386_SEL_RPL    0x0003  /* Requester's Privilege Level mask.  */
 388 #define I386_SEL_UPL    0x0003  /* User Privilige Level.  */
 389 #define I386_SEL_KPL    0x0000  /* Kernel Privilige Level.  */
 390
 391 /* The length of the longest i386 instruction (according to
 392    include/asm-i386/kprobes.h in Linux 2.6.  */
 393 #define I386_MAX_INSN_LEN (16)
 394
 395 /* Functions exported from i386-tdep.c.  */
 396 extern CORE_ADDR i386_pe_skip_trampoline_code (struct frame_info *frame,
 397                                                CORE_ADDR pc, char *name);
 398 extern CORE_ADDR i386_skip_main_prologue (struct gdbarch *gdbarch,
 399                                           CORE_ADDR pc);
 400
 401 /* Return whether the THIS_FRAME corresponds to a sigtramp routine.  */
 402 extern int i386_sigtramp_p (struct frame_info *this_frame);
 403
 404 /* Return non-zero if REGNUM is a member of the specified group.  */
 405 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 406                                      struct reggroup *group);
 407
 408 /* Supply register REGNUM from the general-purpose register set REGSET
 409    to register cache REGCACHE.  If REGNUM is -1, do this for all
 410    registers in REGSET.  */
 411 extern void i386_supply_gregset (const struct regset *regset,
 412                                  struct regcache *regcache, int regnum,
 413                                  const void *gregs, size_t len);
 414
 415 /* General-purpose register set. */
 416 extern const struct regset i386_gregset;
 417
 418 /* Floating-point register set. */
 419 extern const struct regset i386_fpregset;
 420
 421 /* Default iterator over core file register note sections.  */
 422 extern void
 423   i386_iterate_over_regset_sections (struct gdbarch *gdbarch,
 424                                      iterate_over_regset_sections_cb *cb,
 425                                      void *cb_data,
 426                                      const struct regcache *regcache);
 427
 428 typedef buf_displaced_step_closure i386_displaced_step_closure;
 429
 430 extern struct displaced_step_closure *i386_displaced_step_copy_insn
 431   (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to,
 432    struct regcache *regs);
 433 extern void i386_displaced_step_fixup (struct gdbarch *gdbarch,
 434                                        struct displaced_step_closure *closure,
 435                                        CORE_ADDR from, CORE_ADDR to,
 436                                        struct regcache *regs);
 437
 438 /* Initialize a basic ELF architecture variant.  */
 439 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 440
 441 /* Initialize a SVR4 architecture variant.  */
 442 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 443
 444 /* Convert SVR4 register number REG to the appropriate register number
 445    used by GDB.  */
 446 extern int i386_svr4_reg_to_regnum (struct gdbarch *gdbarch, int reg);
 447
 448 extern int i386_process_record (struct gdbarch *gdbarch,
 449                                 struct regcache *regcache, CORE_ADDR addr);
 450 extern const struct target_desc *i386_target_description (uint64_t xcr0,
 451                                                           bool segments);
 452
 453 /* Return true iff the current target is MPX enabled.  */
 454 extern int i386_mpx_enabled (void);
 455 \f
 456
 457 /* Functions and variables exported from i386-bsd-tdep.c.  */
 458
 459 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 460 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
 461 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
 462 extern CORE_ADDR i386obsd_sigtramp_start_addr;
 463 extern CORE_ADDR i386obsd_sigtramp_end_addr;
 464 extern int i386fbsd4_sc_reg_offset[];
 465 extern int i386fbsd_sc_reg_offset[];
 466 extern int i386nbsd_sc_reg_offset[];
 467 extern int i386obsd_sc_reg_offset[];
 468 extern int i386bsd_sc_reg_offset[];
 469
 470 /* SystemTap related functions.  */
 471
 472 extern int i386_stap_is_single_operand (struct gdbarch *gdbarch,
 473                                         const char *s);
 474
 475 extern int i386_stap_parse_special_token (struct gdbarch *gdbarch,
 476                                           struct stap_parse_info *p);
 477
 478 #endif /* i386-tdep.h */