gdb/i386-tdep.h

   1 /* Target-dependent code for the i386.
   2
   3    Copyright (C) 2001-2004, 2006-2012 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 struct frame_info;
  24 struct gdbarch;
  25 struct reggroup;
  26 struct regset;
  27 struct regcache;
  28
  29 /* GDB's i386 target supports both the 32-bit Intel Architecture
  30    (IA-32) and the 64-bit AMD x86-64 architecture.  Internally it uses
  31    a similar register layout for both.
  32
  33    - General purpose registers
  34    - FPU data registers
  35    - FPU control registers
  36    - SSE data registers
  37    - SSE control register
  38
  39    The general purpose registers for the x86-64 architecture are quite
  40    different from IA-32.  Therefore, gdbarch_fp0_regnum
  41    determines the register number at which the FPU data registers
  42    start.  The number of FPU data and control registers is the same
  43    for both architectures.  The number of SSE registers however,
  44    differs and is determined by the num_xmm_regs member of `struct
  45    gdbarch_tdep'.  */
  46
  47 /* Convention for returning structures.  */
  48
  49 enum struct_return
  50 {
  51   pcc_struct_return,            /* Return "short" structures in memory.  */
  52   reg_struct_return             /* Return "short" structures in registers.  */
  53 };
  54
  55 /* Register classes as defined in the AMD x86-64 psABI.  */
  56
  57 enum amd64_reg_class
  58 {
  59   AMD64_INTEGER,
  60   AMD64_SSE,
  61   AMD64_SSEUP,
  62   AMD64_X87,
  63   AMD64_X87UP,
  64   AMD64_COMPLEX_X87,
  65   AMD64_NO_CLASS,
  66   AMD64_MEMORY
  67 };
  68
  69 /* i386 architecture specific information.  */
  70 struct gdbarch_tdep
  71 {
  72   /* General-purpose registers.  */
  73   struct regset *gregset;
  74   int *gregset_reg_offset;
  75   int gregset_num_regs;
  76   size_t sizeof_gregset;
  77
  78   /* The general-purpose registers used to pass integers when making
  79      function calls.  This only applies to amd64, as all parameters
  80      are passed through the stack on x86.  */
  81   int call_dummy_num_integer_regs;
  82   int *call_dummy_integer_regs;
  83
  84   /* Used on amd64 only.  Classify TYPE according to calling conventions,
  85      and store the result in CLASS.  */
  86   void (*classify) (struct type *type, enum amd64_reg_class class[2]);
  87
  88   /* Used on amd64 only.  Non-zero if the first few MEMORY arguments
  89      should be passed by pointer.
  90
  91      More precisely, MEMORY arguments are passed through the stack.
  92      But certain architectures require that their address be passed
  93      by register as well, if there are still some integer registers
  94      available for argument passing.  */
  95   int memory_args_by_pointer;
  96
  97   /* Used on amd64 only.
  98
  99      If non-zero, then the callers of a function are expected to reserve
 100      some space in the stack just before the area where the PC is saved
 101      so that the callee may save the integer-parameter registers there.
 102      The amount of space is dependent on the list of registers used for
 103      integer parameter passing (see component call_dummy_num_integer_regs
 104      above).  */
 105   int integer_param_regs_saved_in_caller_frame;
 106
 107   /* Floating-point registers.  */
 108   struct regset *fpregset;
 109   size_t sizeof_fpregset;
 110
 111   /* XSAVE extended state.  */
 112   struct regset *xstateregset;
 113
 114   /* Register number for %st(0).  The register numbers for the other
 115      registers follow from this one.  Set this to -1 to indicate the
 116      absence of an FPU.  */
 117   int st0_regnum;
 118
 119   /* Number of MMX registers.  */
 120   int num_mmx_regs;
 121
 122   /* Register number for %mm0.  Set this to -1 to indicate the absence
 123      of MMX support.  */
 124   int mm0_regnum;
 125
 126   /* Number of pseudo YMM registers.  */
 127   int num_ymm_regs;
 128
 129   /* Register number for %ymm0.  Set this to -1 to indicate the absence
 130      of pseudo YMM register support.  */
 131   int ymm0_regnum;
 132
 133   /* Number of byte registers.  */
 134   int num_byte_regs;
 135
 136   /* Register pseudo number for %al.  */
 137   int al_regnum;
 138
 139   /* Number of pseudo word registers.  */
 140   int num_word_regs;
 141
 142   /* Register number for %ax.  */
 143   int ax_regnum;
 144
 145   /* Number of pseudo dword registers.  */
 146   int num_dword_regs;
 147
 148   /* Register number for %eax.  Set this to -1 to indicate the absence
 149      of pseudo dword register support.  */
 150   int eax_regnum;
 151
 152   /* Number of core registers.  */
 153   int num_core_regs;
 154
 155   /* Number of SSE registers.  */
 156   int num_xmm_regs;
 157
 158   /* Bits of the extended control register 0 (the XFEATURE_ENABLED_MASK
 159      register), excluding the x87 bit, which are supported by this GDB.  */
 160
 161   uint64_t xcr0;
 162
 163   /* Offset of XCR0 in XSAVE extended state.  */
 164   int xsave_xcr0_offset;
 165
 166   /* Register names.  */
 167   const char **register_names;
 168
 169   /* Register number for %ymm0h.  Set this to -1 to indicate the absence
 170      of upper YMM register support.  */
 171   int ymm0h_regnum;
 172
 173   /* Upper YMM register names.  Only used for tdesc_numbered_register.  */
 174   const char **ymmh_register_names;
 175
 176   /* Target description.  */
 177   const struct target_desc *tdesc;
 178
 179   /* Register group function.  */
 180   const void *register_reggroup_p;
 181
 182   /* Offset of saved PC in jmp_buf.  */
 183   int jb_pc_offset;
 184
 185   /* Convention for returning structures.  */
 186   enum struct_return struct_return;
 187
 188   /* Address range where sigtramp lives.  */
 189   CORE_ADDR sigtramp_start;
 190   CORE_ADDR sigtramp_end;
 191
 192   /* Detect sigtramp.  */
 193   int (*sigtramp_p) (struct frame_info *);
 194
 195   /* Get address of sigcontext for sigtramp.  */
 196   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
 197
 198   /* Offset of registers in `struct sigcontext'.  */
 199   int *sc_reg_offset;
 200   int sc_num_regs;
 201
 202   /* Offset of saved PC and SP in `struct sigcontext'.  Usage of these
 203      is deprecated, please use `sc_reg_offset' instead.  */
 204   int sc_pc_offset;
 205   int sc_sp_offset;
 206
 207   /* ISA-specific data types.  */
 208   struct type *i386_mmx_type;
 209   struct type *i386_ymm_type;
 210   struct type *i387_ext_type;
 211
 212   /* Process record/replay target.  */
 213   /* The map for registers because the AMD64's registers order
 214      in GDB is not same as I386 instructions.  */
 215   const int *record_regmap;
 216   /* Parse intx80 args.  */
 217   int (*i386_intx80_record) (struct regcache *regcache);
 218   /* Parse sysenter args.  */
 219   int (*i386_sysenter_record) (struct regcache *regcache);
 220   /* Parse syscall args.  */
 221   int (*i386_syscall_record) (struct regcache *regcache);
 222 };
 223
 224 /* Floating-point registers.  */
 225
 226 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
 227    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
 228    register cache.  */
 229
 230 /* Return non-zero if REGNUM matches the FP register and the FP
 231    register set is active.  */
 232 extern int i386_fp_regnum_p (struct gdbarch *, int);
 233 extern int i386_fpc_regnum_p (struct gdbarch *, int);
 234
 235 /* Register numbers of various important registers.  */
 236
 237 enum i386_regnum
 238 {
 239   I386_EAX_REGNUM,              /* %eax */
 240   I386_ECX_REGNUM,              /* %ecx */
 241   I386_EDX_REGNUM,              /* %edx */
 242   I386_EBX_REGNUM,              /* %ebx */
 243   I386_ESP_REGNUM,              /* %esp */
 244   I386_EBP_REGNUM,              /* %ebp */
 245   I386_ESI_REGNUM,              /* %esi */
 246   I386_EDI_REGNUM,              /* %edi */
 247   I386_EIP_REGNUM,              /* %eip */
 248   I386_EFLAGS_REGNUM,           /* %eflags */
 249   I386_CS_REGNUM,               /* %cs */
 250   I386_SS_REGNUM,               /* %ss */
 251   I386_DS_REGNUM,               /* %ds */
 252   I386_ES_REGNUM,               /* %es */
 253   I386_FS_REGNUM,               /* %fs */
 254   I386_GS_REGNUM,               /* %gs */
 255   I386_ST0_REGNUM,              /* %st(0) */
 256   I386_MXCSR_REGNUM = 40,       /* %mxcsr */
 257   I386_YMM0H_REGNUM,            /* %ymm0h */
 258   I386_YMM7H_REGNUM = I386_YMM0H_REGNUM + 7
 259 };
 260
 261 /* Register numbers of RECORD_REGMAP.  */
 262
 263 enum record_i386_regnum
 264 {
 265   X86_RECORD_REAX_REGNUM,
 266   X86_RECORD_RECX_REGNUM,
 267   X86_RECORD_REDX_REGNUM,
 268   X86_RECORD_REBX_REGNUM,
 269   X86_RECORD_RESP_REGNUM,
 270   X86_RECORD_REBP_REGNUM,
 271   X86_RECORD_RESI_REGNUM,
 272   X86_RECORD_REDI_REGNUM,
 273   X86_RECORD_R8_REGNUM,
 274   X86_RECORD_R9_REGNUM,
 275   X86_RECORD_R10_REGNUM,
 276   X86_RECORD_R11_REGNUM,
 277   X86_RECORD_R12_REGNUM,
 278   X86_RECORD_R13_REGNUM,
 279   X86_RECORD_R14_REGNUM,
 280   X86_RECORD_R15_REGNUM,
 281   X86_RECORD_REIP_REGNUM,
 282   X86_RECORD_EFLAGS_REGNUM,
 283   X86_RECORD_CS_REGNUM,
 284   X86_RECORD_SS_REGNUM,
 285   X86_RECORD_DS_REGNUM,
 286   X86_RECORD_ES_REGNUM,
 287   X86_RECORD_FS_REGNUM,
 288   X86_RECORD_GS_REGNUM,
 289 };
 290
 291 #define I386_NUM_GREGS  16
 292 #define I386_NUM_XREGS  9
 293
 294 #define I386_SSE_NUM_REGS       (I386_MXCSR_REGNUM + 1)
 295 #define I386_AVX_NUM_REGS       (I386_YMM7H_REGNUM + 1)
 296
 297 /* Size of the largest register.  */
 298 #define I386_MAX_REGISTER_SIZE  16
 299
 300 /* Types for i386-specific registers.  */
 301 extern struct type *i387_ext_type (struct gdbarch *gdbarch);
 302
 303 /* Checks of different pseudo-registers.  */
 304 extern int i386_byte_regnum_p (struct gdbarch *gdbarch, int regnum);
 305 extern int i386_word_regnum_p (struct gdbarch *gdbarch, int regnum);
 306 extern int i386_dword_regnum_p (struct gdbarch *gdbarch, int regnum);
 307 extern int i386_xmm_regnum_p (struct gdbarch *gdbarch, int regnum);
 308 extern int i386_ymm_regnum_p (struct gdbarch *gdbarch, int regnum);
 309
 310 extern const char *i386_pseudo_register_name (struct gdbarch *gdbarch,
 311                                               int regnum);
 312
 313 extern void i386_pseudo_register_read_into_value (struct gdbarch *gdbarch,
 314                                                   struct regcache *regcache,
 315                                                   int regnum,
 316                                                   struct value *result);
 317
 318 extern void i386_pseudo_register_write (struct gdbarch *gdbarch,
 319                                         struct regcache *regcache,
 320                                         int regnum, const gdb_byte *buf);
 321
 322 /* Segment selectors.  */
 323 #define I386_SEL_RPL    0x0003  /* Requester's Privilege Level mask.  */
 324 #define I386_SEL_UPL    0x0003  /* User Privilige Level.  */
 325 #define I386_SEL_KPL    0x0000  /* Kernel Privilige Level.  */
 326
 327 /* The length of the longest i386 instruction (according to
 328    include/asm-i386/kprobes.h in Linux 2.6.  */
 329 #define I386_MAX_INSN_LEN (16)
 330
 331 /* Functions exported from i386-tdep.c.  */
 332 extern CORE_ADDR i386_pe_skip_trampoline_code (struct frame_info *frame,
 333                                                CORE_ADDR pc, char *name);
 334 extern CORE_ADDR i386_skip_main_prologue (struct gdbarch *gdbarch,
 335                                           CORE_ADDR pc);
 336
 337 /* Return whether the THIS_FRAME corresponds to a sigtramp routine.  */
 338 extern int i386_sigtramp_p (struct frame_info *this_frame);
 339
 340 /* Return non-zero if REGNUM is a member of the specified group.  */
 341 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 342                                      struct reggroup *group);
 343
 344 /* Supply register REGNUM from the general-purpose register set REGSET
 345    to register cache REGCACHE.  If REGNUM is -1, do this for all
 346    registers in REGSET.  */
 347 extern void i386_supply_gregset (const struct regset *regset,
 348                                  struct regcache *regcache, int regnum,
 349                                  const void *gregs, size_t len);
 350
 351 /* Collect register REGNUM from the register cache REGCACHE and store
 352    it in the buffer specified by GREGS and LEN as described by the
 353    general-purpose register set REGSET.  If REGNUM is -1, do this for
 354    all registers in REGSET.  */
 355 extern void i386_collect_gregset (const struct regset *regset,
 356                                   const struct regcache *regcache,
 357                                   int regnum, void *gregs, size_t len);
 358
 359 /* Return the appropriate register set for the core section identified
 360    by SECT_NAME and SECT_SIZE.  */
 361 extern const struct regset *
 362   i386_regset_from_core_section (struct gdbarch *gdbarch,
 363                                  const char *sect_name, size_t sect_size);
 364
 365
 366 extern struct displaced_step_closure *i386_displaced_step_copy_insn
 367   (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to,
 368    struct regcache *regs);
 369 extern void i386_displaced_step_fixup (struct gdbarch *gdbarch,
 370                                        struct displaced_step_closure *closure,
 371                                        CORE_ADDR from, CORE_ADDR to,
 372                                        struct regcache *regs);
 373
 374 /* Initialize a basic ELF architecture variant.  */
 375 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 376
 377 /* Initialize a SVR4 architecture variant.  */
 378 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 379
 380 extern int i386_process_record (struct gdbarch *gdbarch,
 381                                 struct regcache *regcache, CORE_ADDR addr);
 382
 383 \f
 384
 385 /* Functions and variables exported from i386bsd-tdep.c.  */
 386
 387 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 388 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
 389 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
 390 extern CORE_ADDR i386obsd_sigtramp_start_addr;
 391 extern CORE_ADDR i386obsd_sigtramp_end_addr;
 392 extern int i386fbsd4_sc_reg_offset[];
 393 extern int i386fbsd_sc_reg_offset[];
 394 extern int i386nbsd_sc_reg_offset[];
 395 extern int i386obsd_sc_reg_offset[];
 396 extern int i386bsd_sc_reg_offset[];
 397
 398 /* SystemTap related functions.  */
 399
 400 extern int i386_stap_is_single_operand (struct gdbarch *gdbarch,
 401                                         const char *s);
 402
 403 extern int i386_stap_parse_special_token (struct gdbarch *gdbarch,
 404                                           struct stap_parse_info *p);
 405
 406 #endif /* i386-tdep.h */