gas/config/tc-i386.h

   1 /* tc-i386.h -- Header file for tc-i386.c
   2    Copyright (C) 1989-2024 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS 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, or (at your option)
   9    any later version.
  10
  11    GAS 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 GAS; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20
  21 #ifndef TC_I386
  22 #define TC_I386 1
  23
  24 #include "opcodes/i386-opc.h"
  25
  26 struct fix;
  27
  28 #define TARGET_BYTES_BIG_ENDIAN 0
  29
  30 #define TARGET_ARCH             (i386_arch ())
  31 #define TARGET_MACH             (i386_mach ())
  32 extern enum bfd_architecture i386_arch (void);
  33 extern unsigned long i386_mach (void);
  34
  35 #ifdef TE_FreeBSD
  36 #define AOUT_TARGET_FORMAT      "a.out-i386-freebsd"
  37 #endif
  38 #ifdef TE_NetBSD
  39 #define AOUT_TARGET_FORMAT      "a.out-i386-netbsd"
  40 #endif
  41 #ifdef TE_386BSD
  42 #define AOUT_TARGET_FORMAT      "a.out-i386-bsd"
  43 #endif
  44 #ifdef TE_LINUX
  45 #define AOUT_TARGET_FORMAT      "a.out-i386-linux"
  46 #endif
  47 #ifdef TE_Mach
  48 #define AOUT_TARGET_FORMAT      "a.out-mach3"
  49 #endif
  50 #ifdef TE_DYNIX
  51 #define AOUT_TARGET_FORMAT      "a.out-i386-dynix"
  52 #endif
  53 #ifndef AOUT_TARGET_FORMAT
  54 #define AOUT_TARGET_FORMAT      "a.out-i386"
  55 #endif
  56
  57 #ifdef TE_FreeBSD
  58 #define ELF_TARGET_FORMAT       "elf32-i386-freebsd"
  59 #define ELF_TARGET_FORMAT64     "elf64-x86-64-freebsd"
  60 #elif defined (TE_VXWORKS)
  61 #define ELF_TARGET_FORMAT       "elf32-i386-vxworks"
  62 #elif defined TE_CLOUDABI
  63 #define ELF_TARGET_FORMAT64     "elf64-x86-64-cloudabi"
  64 #endif
  65
  66 #ifdef TE_SOLARIS
  67 #define ELF_TARGET_FORMAT       "elf32-i386-sol2"
  68 #define ELF_TARGET_FORMAT64     "elf64-x86-64-sol2"
  69 #endif
  70
  71 #ifndef ELF_TARGET_FORMAT
  72 #define ELF_TARGET_FORMAT       "elf32-i386"
  73 #endif
  74
  75 #ifndef ELF_TARGET_FORMAT64
  76 #define ELF_TARGET_FORMAT64     "elf64-x86-64"
  77 #endif
  78
  79 #ifndef ELF_TARGET_FORMAT32
  80 #define ELF_TARGET_FORMAT32     "elf32-x86-64"
  81 #endif
  82
  83 #ifndef ELF_TARGET_IAMCU_FORMAT
  84 #define ELF_TARGET_IAMCU_FORMAT "elf32-iamcu"
  85 #endif
  86
  87 #if ((defined (OBJ_MAYBE_COFF) && defined (OBJ_MAYBE_AOUT)) \
  88      || defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) \
  89      || defined (TE_PE) || defined (TE_PEP) || defined (OBJ_MACH_O))
  90 extern const char *i386_target_format (void);
  91 #define TARGET_FORMAT i386_target_format ()
  92 #else
  93 #ifdef TE_GO32
  94 #define TARGET_FORMAT           "coff-go32"
  95 #endif
  96 #ifdef OBJ_AOUT
  97 #define TARGET_FORMAT           AOUT_TARGET_FORMAT
  98 #endif
  99 #endif
 100
 101 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
 102
 103 /* '$' may be used as immediate prefix.  */
 104 #undef LOCAL_LABELS_DOLLAR
 105 #define LOCAL_LABELS_DOLLAR 0
 106 #undef LOCAL_LABELS_FB
 107 #define LOCAL_LABELS_FB 1
 108
 109 extern const char extra_symbol_chars[];
 110 #define tc_symbol_chars extra_symbol_chars
 111
 112 extern const char *i386_comment_chars;
 113 #define tc_comment_chars i386_comment_chars
 114
 115 /* The name of the global offset table generated by the compiler. Allow
 116    this to be overridden if need be.  */
 117 #ifndef GLOBAL_OFFSET_TABLE_NAME
 118 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 119 #endif
 120
 121 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) x86_cons (EXP, NBYTES)
 122 extern bfd_reloc_code_real_type x86_cons (expressionS *, int);
 123
 124 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP, RELOC)     \
 125   x86_cons_fix_new(FRAG, OFF, LEN, EXP, RELOC)
 126 extern void x86_cons_fix_new
 127 (fragS *, unsigned int, unsigned int, expressionS *, bfd_reloc_code_real_type);
 128
 129 #define X_PRECISION     5
 130 #define X_PRECISION_PAD 0
 131
 132 #define TC_ADDRESS_BYTES x86_address_bytes
 133 extern int x86_address_bytes (void);
 134
 135 #define DIFF_EXPR_OK    /* foo-. gets turned into PC relative relocs */
 136
 137 #define NO_RELOC BFD_RELOC_NONE
 138
 139 int i386_validate_fix (struct fix *);
 140 #define TC_VALIDATE_FIX(FIX,SEGTYPE,SKIP) do { \
 141     if (!i386_validate_fix(FIX)) goto SKIP;      \
 142   } while (0)
 143
 144 #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
 145 #define tc_fix_adjustable(X)  tc_i386_fix_adjustable(X)
 146 extern int tc_i386_fix_adjustable (struct fix *);
 147 #else
 148 #define tc_fix_adjustable(X)  ((void)(X), 1)
 149 #endif
 150
 151 /* Values passed to md_apply_fix don't include the symbol value.  */
 152 #define MD_APPLY_SYM_VALUE(FIX) 0
 153
 154 /* ELF wants external syms kept, as does PE COFF.  */
 155 #if defined (TE_PE) && defined (STRICT_PE_FORMAT)
 156 #define EXTERN_FORCE_RELOC                              \
 157   (IS_ELF || OUTPUT_FLAVOR == bfd_target_coff_flavour)
 158 #else
 159 #define EXTERN_FORCE_RELOC      IS_ELF
 160 #endif
 161
 162 /* This expression evaluates to true if the relocation is for a local
 163    object for which we still want to do the relocation at runtime.
 164    False if we are willing to perform this relocation while building
 165    the .o file.  GOTOFF and GOT32 do not need to be checked here because
 166    they are not pcrel.  .*/
 167
 168 #define TC_FORCE_RELOCATION_LOCAL(FIX)                          \
 169   (GENERIC_FORCE_RELOCATION_LOCAL (FIX)                         \
 170    || (FIX)->fx_r_type == BFD_RELOC_386_PLT32                   \
 171    || (FIX)->fx_r_type == BFD_RELOC_386_GOTPC                   \
 172    || (FIX)->fx_r_type == BFD_RELOC_X86_64_GOTPCREL             \
 173    || (FIX)->fx_r_type == BFD_RELOC_X86_64_GOTPCRELX            \
 174    || (FIX)->fx_r_type == BFD_RELOC_X86_64_REX_GOTPCRELX        \
 175    || (FIX)->fx_r_type == BFD_RELOC_X86_64_CODE_4_GOTPCRELX)
 176
 177 #define TC_FORCE_RELOCATION_ABS(FIX)                            \
 178   (TC_FORCE_RELOCATION (FIX)                                    \
 179    || (FIX)->fx_r_type == BFD_RELOC_386_GOT32                   \
 180    || (FIX)->fx_r_type == BFD_RELOC_386_GOT32X                  \
 181    || (FIX)->fx_r_type == BFD_RELOC_X86_64_GOTPCREL             \
 182    || (FIX)->fx_r_type == BFD_RELOC_X86_64_GOTPCRELX            \
 183    || (FIX)->fx_r_type == BFD_RELOC_X86_64_REX_GOTPCRELX        \
 184    || (FIX)->fx_r_type == BFD_RELOC_X86_64_CODE_4_GOTPCRELX)
 185
 186 extern int i386_parse_name (char *, expressionS *, char *);
 187 #define md_parse_name(s, e, m, c) i386_parse_name (s, e, c)
 188
 189 extern operatorT i386_operator (const char *name, unsigned int operands, char *);
 190 #define md_operator i386_operator
 191
 192 extern int i386_need_index_operator (void);
 193 #define md_need_index_operator i386_need_index_operator
 194
 195 #ifdef BFD64
 196 extern bool i386_record_operator
 197   (operatorT, const expressionS *, const expressionS *);
 198 #define md_optimize_expr(l, o, r) i386_record_operator (o, l, r)
 199 #endif
 200
 201 #define md_register_arithmetic 0
 202
 203 extern const struct relax_type md_relax_table[];
 204 #define TC_GENERIC_RELAX_TABLE md_relax_table
 205
 206 extern int optimize_align_code;
 207
 208 #define md_do_align(n, fill, len, max, around)                          \
 209 if ((n)                                                                 \
 210     && !need_pass_2                                                     \
 211     && optimize_align_code                                              \
 212     && (!(fill)                                                         \
 213         || ((char)*(fill) == (char)0x90 && (len) == 1))                 \
 214     && subseg_text_p (now_seg))                                         \
 215   {                                                                     \
 216     frag_align_code ((n), (max));                                       \
 217     goto around;                                                        \
 218   }
 219
 220 #define MAX_MEM_FOR_RS_ALIGN_CODE \
 221   (alignment ? ((size_t) 1 << alignment) - 1 : (size_t) 1)
 222
 223 extern void i386_cons_align (int);
 224 #define md_cons_align(nbytes) i386_cons_align (nbytes)
 225
 226 #if !defined (OBJ_AOUT) && !defined (OBJ_MAYBE_AOUT)
 227 #define md_section_align(seg, value) ((void)(seg), (value))
 228 #endif
 229
 230 void i386_print_statistics (FILE *);
 231 #define tc_print_statistics i386_print_statistics
 232
 233 void i386_md_end (void);
 234 #define md_end i386_md_end
 235
 236 extern unsigned int i386_frag_max_var (fragS *);
 237 #define md_frag_max_var i386_frag_max_var
 238
 239 extern long i386_generic_table_relax_frag (segT, fragS *, long);
 240 #define md_generic_table_relax_frag(segment, fragP, stretch) \
 241   i386_generic_table_relax_frag (segment, fragP, stretch)
 242
 243 #define md_number_to_chars number_to_chars_littleendian
 244
 245 enum processor_type
 246 {
 247   PROCESSOR_UNKNOWN,
 248   PROCESSOR_GENERIC32,
 249   PROCESSOR_GENERIC64,
 250   PROCESSOR_I386,
 251   PROCESSOR_I486,
 252   PROCESSOR_PENTIUM,
 253   PROCESSOR_I686,
 254   PROCESSOR_PENTIUMPRO,
 255   PROCESSOR_PENTIUM4,
 256   PROCESSOR_NOCONA,
 257   PROCESSOR_CORE,
 258   PROCESSOR_CORE2,
 259   PROCESSOR_COREI7,
 260   PROCESSOR_IAMCU,
 261   PROCESSOR_K6,
 262   PROCESSOR_ATHLON,
 263   PROCESSOR_K8,
 264   PROCESSOR_AMDFAM10,
 265   PROCESSOR_BD,
 266   PROCESSOR_ZNVER,
 267   PROCESSOR_BT,
 268   /* Keep this last.  */
 269   PROCESSOR_NONE
 270 };
 271
 272 extern i386_cpu_flags cpu_arch_flags;
 273 extern enum processor_type cpu_arch_tune;
 274 extern enum processor_type cpu_arch_isa;
 275 extern i386_cpu_flags cpu_arch_isa_flags;
 276
 277 /* We support four different modes.  I386_FLAG_CODE variable is used to
 278    distinguish three of these.  */
 279
 280 extern enum i386_flag_code {
 281         CODE_32BIT,
 282         CODE_16BIT,
 283         CODE_64BIT
 284 } i386_flag_code;
 285
 286 struct i386_segment_info {
 287   /* Type of previous "instruction", e.g. .byte or stand-alone prefix.  */
 288   struct last_insn {
 289     const char *file;
 290     const char *name;
 291     unsigned int line;
 292     enum last_insn_kind
 293       {
 294         last_insn_other = 0,
 295         last_insn_directive,
 296         last_insn_prefix
 297       } kind;
 298   } last_insn;
 299   subsegT subseg;
 300   struct i386_segment_info *next;
 301 };
 302
 303 #define TC_SEGMENT_INFO_TYPE struct i386_segment_info
 304
 305 struct i386_tc_frag_data
 306 {
 307   union
 308     {
 309       fragS *padding_fragP;
 310       fragS *branch_fragP;
 311     } u;
 312   addressT padding_address;
 313   enum processor_type isa;
 314   enum processor_type tune;
 315   enum i386_flag_code code;
 316   unsigned int max_bytes;
 317   unsigned char length;
 318   unsigned char last_length;
 319   unsigned char max_prefix_length;
 320   unsigned char prefix_length;
 321   unsigned char default_prefix;
 322   unsigned char cmp_size;
 323   unsigned int mf_type : 3;
 324   unsigned int classified : 1;
 325   unsigned int branch_type : 3;
 326   unsigned int cpunop : 1;
 327   unsigned int isanop : 1;
 328   unsigned int last_insn_normal : 1;
 329 };
 330
 331 /* We need to emit the right NOP pattern in .align frags.  This is
 332    done after the text-to-bits assembly pass, so we need to mark it with
 333    the isa/tune settings at the time the .align was assembled.  */
 334 #define TC_FRAG_TYPE struct i386_tc_frag_data
 335
 336 #define TC_FRAG_INIT(FRAGP, MAX_BYTES)                          \
 337  do                                                             \
 338    {                                                            \
 339      (FRAGP)->tc_frag_data.u.padding_fragP = NULL;              \
 340      (FRAGP)->tc_frag_data.padding_address = 0;                 \
 341      (FRAGP)->tc_frag_data.isa = cpu_arch_isa;                  \
 342      (FRAGP)->tc_frag_data.tune = cpu_arch_tune;                \
 343      (FRAGP)->tc_frag_data.cpunop = cpu_arch_flags.bitfield.cpunop; \
 344      (FRAGP)->tc_frag_data.isanop = cpu_arch_isa_flags.bitfield.cpunop; \
 345      (FRAGP)->tc_frag_data.code = i386_flag_code;               \
 346      (FRAGP)->tc_frag_data.max_bytes = (MAX_BYTES);             \
 347      (FRAGP)->tc_frag_data.length = 0;                          \
 348      (FRAGP)->tc_frag_data.last_length = 0;                     \
 349      (FRAGP)->tc_frag_data.max_prefix_length = 0;               \
 350      (FRAGP)->tc_frag_data.prefix_length = 0;                   \
 351      (FRAGP)->tc_frag_data.default_prefix = 0;                  \
 352      (FRAGP)->tc_frag_data.cmp_size = 0;                        \
 353      (FRAGP)->tc_frag_data.classified = 0;                      \
 354      (FRAGP)->tc_frag_data.branch_type = 0;                     \
 355      (FRAGP)->tc_frag_data.mf_type = 0;                         \
 356      (FRAGP)->tc_frag_data.last_insn_normal                     \
 357         = (seg_info(now_seg)->tc_segment_info_data.last_insn.kind \
 358            == last_insn_other);                                 \
 359    }                                                            \
 360  while (0)
 361
 362 #define WORKING_DOT_WORD 1
 363
 364 /* How to generate NOPs for .nop direct directive.  */
 365 extern void i386_generate_nops (fragS *, char *, offsetT, int);
 366 #define md_generate_nops(frag, where, amount, control) \
 367   i386_generate_nops ((frag), (where), (amount), (control))
 368
 369 #define HANDLE_ALIGN(fragP)                                             \
 370 if (fragP->fr_type == rs_align_code)                                    \
 371   {                                                                     \
 372     offsetT __count = (fragP->fr_next->fr_address                       \
 373                        - fragP->fr_address                              \
 374                        - fragP->fr_fix);                                \
 375     if (__count > 0                                                     \
 376         && (unsigned int) __count <= fragP->tc_frag_data.max_bytes)     \
 377       md_generate_nops (fragP, fragP->fr_literal + fragP->fr_fix,       \
 378                         __count, 0);                                    \
 379   }
 380
 381 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 382 #define TARGET_USE_CFIPOP 1
 383
 384 extern unsigned int x86_dwarf2_return_column;
 385 #define DWARF2_DEFAULT_RETURN_COLUMN x86_dwarf2_return_column
 386
 387 extern int x86_cie_data_alignment;
 388 #define DWARF2_CIE_DATA_ALIGNMENT x86_cie_data_alignment
 389
 390 extern int x86_dwarf2_addr_size (void);
 391 #define DWARF2_ADDR_SIZE(bfd) x86_dwarf2_addr_size ()
 392
 393 #define tc_parse_to_dw2regnum tc_x86_parse_to_dw2regnum
 394 extern void tc_x86_parse_to_dw2regnum (expressionS *);
 395
 396 #define tc_cfi_frame_initial_instructions tc_x86_frame_initial_instructions
 397 extern void tc_x86_frame_initial_instructions (void);
 398
 399 /* DWARF register number of the frame-pointer register in 64-bit mode.  */
 400 #define REG_FP 6
 401 /* DWARF register number of the stack-pointer register in 64-bit mode.  */
 402 #define REG_SP 7
 403
 404 #define md_elf_section_type(str,len) i386_elf_section_type (str, len)
 405 extern int i386_elf_section_type (const char *, size_t);
 406
 407 #define md_elf_section_change_hook i386_elf_section_change_hook
 408 extern void i386_elf_section_change_hook (void);
 409
 410 #ifdef TE_SOLARIS
 411 #define md_fix_up_eh_frame(sec) i386_solaris_fix_up_eh_frame (sec)
 412 extern void i386_solaris_fix_up_eh_frame (segT);
 413 #endif
 414
 415 /* Support for SHF_X86_64_LARGE */
 416 extern bfd_vma x86_64_section_letter (int, const char **);
 417 #define md_elf_section_letter(LETTER, PTR_MSG)  x86_64_section_letter (LETTER, PTR_MSG)
 418
 419 #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
 420 extern void x86_cleanup (void);
 421 #define md_cleanup() x86_cleanup ()
 422
 423 #define TARGET_USE_GINSN 1
 424 /* Allow GAS to synthesize DWARF CFI for hand-written asm.
 425    PS: TARGET_USE_CFIPOP is a pre-condition.  */
 426 #define TARGET_USE_SCFI 1
 427 /* Identify the maximum DWARF register number of all the registers being
 428    tracked for SCFI.  This is the last DWARF register number of the set
 429    of SP, BP, and all callee-saved registers.  For AMD64, this means
 430    R15 (15).  Use SCFI_CALLEE_SAVED_REG_P to identify which registers
 431    are callee-saved from this set.  */
 432 #define SCFI_MAX_REG_ID 15
 433 /* Some ABIs, like AMD64, use stack for call instruction.  For such an ABI,
 434    identify the initial (CFA) offset from RSP at the entry of function.  */
 435 #define SCFI_INIT_CFA_OFFSET 8
 436
 437 #define SCFI_CALLEE_SAVED_REG_P(dw2reg)  x86_scfi_callee_saved_p (dw2reg)
 438 extern bool x86_scfi_callee_saved_p (uint32_t dw2reg_num);
 439
 440 /* Whether SFrame stack trace info is supported.  */
 441 extern bool x86_support_sframe_p (void);
 442 #define support_sframe_p x86_support_sframe_p
 443
 444 /* The stack-pointer register number for SFrame stack trace info.  */
 445 extern unsigned int x86_sframe_cfa_sp_reg;
 446 #define SFRAME_CFA_SP_REG x86_sframe_cfa_sp_reg
 447
 448 /* The frame-pointer register number for SFrame stack trace info.  */
 449 extern unsigned int x86_sframe_cfa_fp_reg;
 450 #define SFRAME_CFA_FP_REG x86_sframe_cfa_fp_reg
 451
 452 /* Specify if RA tracking is needed.  */
 453 extern bool x86_sframe_ra_tracking_p (void);
 454 #define sframe_ra_tracking_p x86_sframe_ra_tracking_p
 455
 456 /* Specify the fixed offset to recover RA from CFA.
 457    (useful only when RA tracking is not needed).  */
 458 extern offsetT x86_sframe_cfa_ra_offset (void);
 459 #define sframe_cfa_ra_offset x86_sframe_cfa_ra_offset
 460
 461 /* The abi/arch indentifier for SFrame.  */
 462 extern unsigned char x86_sframe_get_abi_arch (void);
 463 #define sframe_get_abi_arch x86_sframe_get_abi_arch
 464
 465 #endif
 466
 467 #ifdef TE_PE
 468
 469 #define O_secrel O_md1
 470
 471 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 472 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 473
 474 #endif /* TE_PE */
 475
 476 /* X_add_symbol:X_op_symbol (Intel mode only) */
 477 #define O_full_ptr O_md2
 478
 479 #ifdef OBJ_MACH_O
 480
 481 #define TC_FORCE_RELOCATION(FIX) (obj_mach_o_force_reloc (FIX))
 482
 483 #define TC_FORCE_RELOCATION_SUB_SAME(FIX,SEG) \
 484           (obj_mach_o_force_reloc_sub_same (FIX, SEG))
 485
 486 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX,SEG) \
 487         (obj_mach_o_force_reloc_sub_local (FIX, SEG))
 488
 489 #define TC_VALIDATE_FIX_SUB(FIX, SEG) 1
 490
 491 #endif /* OBJ_MACH_O */
 492
 493 #endif /* TC_I386 */