gdb/i386-tdep.h

   1 /* Target-dependent code for the i386.
   2
   3    Copyright (C) 2001-2013 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   /* Classify TYPE according to calling conventions, and store
  85      the result in CLASS.  Used on amd64 only.  */
  86   void (*classify) (struct type *type, enum amd64_reg_class class[2]);
  87
  88   /* Non-zero if the first few MEMORY arguments should be passed by
  89      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   /* Floating-point registers.  */
  98   struct regset *fpregset;
  99   size_t sizeof_fpregset;
 100
 101   /* XSAVE extended state.  */
 102   struct regset *xstateregset;
 103
 104   /* Register number for %st(0).  The register numbers for the other
 105      registers follow from this one.  Set this to -1 to indicate the
 106      absence of an FPU.  */
 107   int st0_regnum;
 108
 109   /* Number of MMX registers.  */
 110   int num_mmx_regs;
 111
 112   /* Register number for %mm0.  Set this to -1 to indicate the absence
 113      of MMX support.  */
 114   int mm0_regnum;
 115
 116   /* Number of pseudo YMM registers.  */
 117   int num_ymm_regs;
 118
 119   /* Register number for %ymm0.  Set this to -1 to indicate the absence
 120      of pseudo YMM register support.  */
 121   int ymm0_regnum;
 122
 123   /* Number of byte registers.  */
 124   int num_byte_regs;
 125
 126   /* Register pseudo number for %al.  */
 127   int al_regnum;
 128
 129   /* Number of pseudo word registers.  */
 130   int num_word_regs;
 131
 132   /* Register number for %ax.  */
 133   int ax_regnum;
 134
 135   /* Number of pseudo dword registers.  */
 136   int num_dword_regs;
 137
 138   /* Register number for %eax.  Set this to -1 to indicate the absence
 139      of pseudo dword register support.  */
 140   int eax_regnum;
 141
 142   /* Number of core registers.  */
 143   int num_core_regs;
 144
 145   /* Number of SSE registers.  */
 146   int num_xmm_regs;
 147
 148   /* Bits of the extended control register 0 (the XFEATURE_ENABLED_MASK
 149      register), excluding the x87 bit, which are supported by this GDB.  */
 150
 151   uint64_t xcr0;
 152
 153   /* Offset of XCR0 in XSAVE extended state.  */
 154   int xsave_xcr0_offset;
 155
 156   /* Register names.  */
 157   const char **register_names;
 158
 159   /* Register number for %ymm0h.  Set this to -1 to indicate the absence
 160      of upper YMM register support.  */
 161   int ymm0h_regnum;
 162
 163   /* Upper YMM register names.  Only used for tdesc_numbered_register.  */
 164   const char **ymmh_register_names;
 165
 166   /* Target description.  */
 167   const struct target_desc *tdesc;
 168
 169   /* Register group function.  */
 170   const void *register_reggroup_p;
 171
 172   /* Offset of saved PC in jmp_buf.  */
 173   int jb_pc_offset;
 174
 175   /* Convention for returning structures.  */
 176   enum struct_return struct_return;
 177
 178   /* Address range where sigtramp lives.  */
 179   CORE_ADDR sigtramp_start;
 180   CORE_ADDR sigtramp_end;
 181
 182   /* Detect sigtramp.  */
 183   int (*sigtramp_p) (struct frame_info *);
 184
 185   /* Get address of sigcontext for sigtramp.  */
 186   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
 187
 188   /* Offset of registers in `struct sigcontext'.  */
 189   int *sc_reg_offset;
 190   int sc_num_regs;
 191
 192   /* Offset of saved PC and SP in `struct sigcontext'.  Usage of these
 193      is deprecated, please use `sc_reg_offset' instead.  */
 194   int sc_pc_offset;
 195   int sc_sp_offset;
 196
 197   /* ISA-specific data types.  */
 198   struct type *i386_mmx_type;
 199   struct type *i386_ymm_type;
 200   struct type *i387_ext_type;
 201
 202   /* Process record/replay target.  */
 203   /* The map for registers because the AMD64's registers order
 204      in GDB is not same as I386 instructions.  */
 205   const int *record_regmap;
 206   /* Parse intx80 args.  */
 207   int (*i386_intx80_record) (struct regcache *regcache);
 208   /* Parse sysenter args.  */
 209   int (*i386_sysenter_record) (struct regcache *regcache);
 210   /* Parse syscall args.  */
 211   int (*i386_syscall_record) (struct regcache *regcache);
 212 };
 213
 214 /* Floating-point registers.  */
 215
 216 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
 217    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
 218    register cache.  */
 219
 220 /* Return non-zero if REGNUM matches the FP register and the FP
 221    register set is active.  */
 222 extern int i386_fp_regnum_p (struct gdbarch *, int);
 223 extern int i386_fpc_regnum_p (struct gdbarch *, int);
 224
 225 /* Register numbers of various important registers.  */
 226
 227 enum i386_regnum
 228 {
 229   I386_EAX_REGNUM,              /* %eax */
 230   I386_ECX_REGNUM,              /* %ecx */
 231   I386_EDX_REGNUM,              /* %edx */
 232   I386_EBX_REGNUM,              /* %ebx */
 233   I386_ESP_REGNUM,              /* %esp */
 234   I386_EBP_REGNUM,              /* %ebp */
 235   I386_ESI_REGNUM,              /* %esi */
 236   I386_EDI_REGNUM,              /* %edi */
 237   I386_EIP_REGNUM,              /* %eip */
 238   I386_EFLAGS_REGNUM,           /* %eflags */
 239   I386_CS_REGNUM,               /* %cs */
 240   I386_SS_REGNUM,               /* %ss */
 241   I386_DS_REGNUM,               /* %ds */
 242   I386_ES_REGNUM,               /* %es */
 243   I386_FS_REGNUM,               /* %fs */
 244   I386_GS_REGNUM,               /* %gs */
 245   I386_ST0_REGNUM,              /* %st(0) */
 246   I386_MXCSR_REGNUM = 40,       /* %mxcsr */
 247   I386_YMM0H_REGNUM,            /* %ymm0h */
 248   I386_YMM7H_REGNUM = I386_YMM0H_REGNUM + 7
 249 };
 250
 251 /* Register numbers of RECORD_REGMAP.  */
 252
 253 enum record_i386_regnum
 254 {
 255   X86_RECORD_REAX_REGNUM,
 256   X86_RECORD_RECX_REGNUM,
 257   X86_RECORD_REDX_REGNUM,
 258   X86_RECORD_REBX_REGNUM,
 259   X86_RECORD_RESP_REGNUM,
 260   X86_RECORD_REBP_REGNUM,
 261   X86_RECORD_RESI_REGNUM,
 262   X86_RECORD_REDI_REGNUM,
 263   X86_RECORD_R8_REGNUM,
 264   X86_RECORD_R9_REGNUM,
 265   X86_RECORD_R10_REGNUM,
 266   X86_RECORD_R11_REGNUM,
 267   X86_RECORD_R12_REGNUM,
 268   X86_RECORD_R13_REGNUM,
 269   X86_RECORD_R14_REGNUM,
 270   X86_RECORD_R15_REGNUM,
 271   X86_RECORD_REIP_REGNUM,
 272   X86_RECORD_EFLAGS_REGNUM,
 273   X86_RECORD_CS_REGNUM,
 274   X86_RECORD_SS_REGNUM,
 275   X86_RECORD_DS_REGNUM,
 276   X86_RECORD_ES_REGNUM,
 277   X86_RECORD_FS_REGNUM,
 278   X86_RECORD_GS_REGNUM,
 279 };
 280
 281 #define I386_NUM_GREGS  16
 282 #define I386_NUM_XREGS  9
 283
 284 #define I386_SSE_NUM_REGS       (I386_MXCSR_REGNUM + 1)
 285 #define I386_AVX_NUM_REGS       (I386_YMM7H_REGNUM + 1)
 286
 287 /* Size of the largest register.  */
 288 #define I386_MAX_REGISTER_SIZE  16
 289
 290 /* Types for i386-specific registers.  */
 291 extern struct type *i387_ext_type (struct gdbarch *gdbarch);
 292
 293 /* Checks of different pseudo-registers.  */
 294 extern int i386_byte_regnum_p (struct gdbarch *gdbarch, int regnum);
 295 extern int i386_word_regnum_p (struct gdbarch *gdbarch, int regnum);
 296 extern int i386_dword_regnum_p (struct gdbarch *gdbarch, int regnum);
 297 extern int i386_xmm_regnum_p (struct gdbarch *gdbarch, int regnum);
 298 extern int i386_ymm_regnum_p (struct gdbarch *gdbarch, int regnum);
 299
 300 extern const char *i386_pseudo_register_name (struct gdbarch *gdbarch,
 301                                               int regnum);
 302 extern struct type *i386_pseudo_register_type (struct gdbarch *gdbarch,
 303                                                int regnum);
 304
 305 extern void i386_pseudo_register_read_into_value (struct gdbarch *gdbarch,
 306                                                   struct regcache *regcache,
 307                                                   int regnum,
 308                                                   struct value *result);
 309
 310 extern void i386_pseudo_register_write (struct gdbarch *gdbarch,
 311                                         struct regcache *regcache,
 312                                         int regnum, const gdb_byte *buf);
 313
 314 /* Segment selectors.  */
 315 #define I386_SEL_RPL    0x0003  /* Requester's Privilege Level mask.  */
 316 #define I386_SEL_UPL    0x0003  /* User Privilige Level.  */
 317 #define I386_SEL_KPL    0x0000  /* Kernel Privilige Level.  */
 318
 319 /* The length of the longest i386 instruction (according to
 320    include/asm-i386/kprobes.h in Linux 2.6.  */
 321 #define I386_MAX_INSN_LEN (16)
 322
 323 /* Functions exported from i386-tdep.c.  */
 324 extern CORE_ADDR i386_pe_skip_trampoline_code (struct frame_info *frame,
 325                                                CORE_ADDR pc, char *name);
 326 extern CORE_ADDR i386_skip_main_prologue (struct gdbarch *gdbarch,
 327                                           CORE_ADDR pc);
 328
 329 /* Return whether the THIS_FRAME corresponds to a sigtramp routine.  */
 330 extern int i386_sigtramp_p (struct frame_info *this_frame);
 331
 332 /* Return non-zero if REGNUM is a member of the specified group.  */
 333 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 334                                      struct reggroup *group);
 335
 336 /* Supply register REGNUM from the general-purpose register set REGSET
 337    to register cache REGCACHE.  If REGNUM is -1, do this for all
 338    registers in REGSET.  */
 339 extern void i386_supply_gregset (const struct regset *regset,
 340                                  struct regcache *regcache, int regnum,
 341                                  const void *gregs, size_t len);
 342
 343 /* Collect register REGNUM from the register cache REGCACHE and store
 344    it in the buffer specified by GREGS and LEN as described by the
 345    general-purpose register set REGSET.  If REGNUM is -1, do this for
 346    all registers in REGSET.  */
 347 extern void i386_collect_gregset (const struct regset *regset,
 348                                   const struct regcache *regcache,
 349                                   int regnum, void *gregs, size_t len);
 350
 351 /* Return the appropriate register set for the core section identified
 352    by SECT_NAME and SECT_SIZE.  */
 353 extern const struct regset *
 354   i386_regset_from_core_section (struct gdbarch *gdbarch,
 355                                  const char *sect_name, size_t sect_size);
 356
 357
 358 extern struct displaced_step_closure *i386_displaced_step_copy_insn
 359   (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to,
 360    struct regcache *regs);
 361 extern void i386_displaced_step_fixup (struct gdbarch *gdbarch,
 362                                        struct displaced_step_closure *closure,
 363                                        CORE_ADDR from, CORE_ADDR to,
 364                                        struct regcache *regs);
 365
 366 /* Initialize a basic ELF architecture variant.  */
 367 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 368
 369 /* Initialize a SVR4 architecture variant.  */
 370 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 371
 372 extern int i386_process_record (struct gdbarch *gdbarch,
 373                                 struct regcache *regcache, CORE_ADDR addr);
 374
 375 \f
 376
 377 /* Functions and variables exported from i386bsd-tdep.c.  */
 378
 379 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 380 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
 381 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
 382 extern CORE_ADDR i386obsd_sigtramp_start_addr;
 383 extern CORE_ADDR i386obsd_sigtramp_end_addr;
 384 extern int i386fbsd4_sc_reg_offset[];
 385 extern int i386fbsd_sc_reg_offset[];
 386 extern int i386nbsd_sc_reg_offset[];
 387 extern int i386obsd_sc_reg_offset[];
 388 extern int i386bsd_sc_reg_offset[];
 389
 390 /* SystemTap related functions.  */
 391
 392 extern int i386_stap_is_single_operand (struct gdbarch *gdbarch,
 393                                         const char *s);
 394
 395 extern int i386_stap_parse_special_token (struct gdbarch *gdbarch,
 396                                           struct stap_parse_info *p);
 397
 398 #endif /* i386-tdep.h */