gas/as.h

   1 /* as.h - global header file
   2    Copyright (C) 1987-2021 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, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    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 GAS
  22 #define GAS 1
  23 /* I think this stuff is largely out of date.  xoxorich.
  24
  25    CAPITALISED names are #defined.
  26    "lowercaseH" is #defined if "lowercase.h" has been #include-d.
  27    "lowercaseT" is a typedef of "lowercase" objects.
  28    "lowercaseP" is type "pointer to object of type 'lowercase'".
  29    "lowercaseS" is typedef struct ... lowercaseS.
  30
  31    #define DEBUG to enable all the "know" assertion tests.
  32    #define SUSPECT when debugging hash code.
  33    #define COMMON as "extern" for all modules except one, where you #define
  34         COMMON as "".
  35    If TEST is #defined, then we are testing a module: #define COMMON as "".  */
  36
  37 #include "config.h"
  38
  39 /* Now, tend to the rest of the configuration.  */
  40
  41 /* System include files first...  */
  42 #include <stdio.h>
  43 #include <string.h>
  44 #include <stdlib.h>
  45
  46 #ifdef HAVE_UNISTD_H
  47 #include <unistd.h>
  48 #endif
  49 #ifdef HAVE_SYS_TYPES_H
  50 /* for size_t, pid_t */
  51 #include <sys/types.h>
  52 #endif
  53
  54 #include <errno.h>
  55 #include <stdarg.h>
  56
  57 #include "getopt.h"
  58 /* The first getopt value for machine-independent long options.
  59    150 isn't special; it's just an arbitrary non-ASCII char value.  */
  60 #define OPTION_STD_BASE 150
  61 /* The first getopt value for machine-dependent long options.
  62    290 gives the standard options room to grow.  */
  63 #define OPTION_MD_BASE  290
  64
  65 #ifdef DEBUG
  66 #undef NDEBUG
  67 #endif
  68 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
  69 #define __PRETTY_FUNCTION__  ((char *) NULL)
  70 #endif
  71 #define gas_assert(P)   ((void) ((P) ? 0 : (abort (), 0)))
  72 #undef abort
  73 #define abort()         as_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
  74
  75 /* Now GNU header files...  */
  76 #include "ansidecl.h"
  77 #include "bfd.h"
  78 #include "libiberty.h"
  79
  80 /* Define the standard progress macros.  */
  81 #include "progress.h"
  82
  83 /* Other stuff from config.h.  */
  84 #ifdef NEED_DECLARATION_ENVIRON
  85 extern char **environ;
  86 #endif
  87 #ifdef NEED_DECLARATION_FFS
  88 extern int ffs (int);
  89 #endif
  90
  91 #if !HAVE_DECL_MEMPCPY
  92 void *mempcpy(void *, const void *, size_t);
  93 #endif
  94
  95 #ifndef __LINE__
  96 #define __LINE__ "unknown"
  97 #endif /* __LINE__ */
  98
  99 #ifndef __FILE__
 100 #define __FILE__ "unknown"
 101 #endif /* __FILE__ */
 102
 103 #ifndef FOPEN_WB
 104 #ifdef USE_BINARY_FOPEN
 105 #include "fopen-bin.h"
 106 #else
 107 #include "fopen-same.h"
 108 #endif
 109 #endif
 110
 111 #ifndef EXIT_SUCCESS
 112 #define EXIT_SUCCESS 0
 113 #define EXIT_FAILURE 1
 114 #endif
 115
 116 #ifndef SEEK_SET
 117 #define SEEK_SET 0
 118 #endif
 119
 120 #define obstack_chunk_alloc xmalloc
 121 #define obstack_chunk_free xfree
 122
 123 #define xfree free
 124
 125 #include "asintl.h"
 126
 127 #define BAD_CASE(val)                                                       \
 128   {                                                                         \
 129     as_fatal (_("Case value %ld unexpected at line %d of file \"%s\"\n"),   \
 130               (long) val, __LINE__, __FILE__);                              \
 131   }
 132 \f
 133 #include "flonum.h"
 134
 135 /* These are assembler-wide concepts */
 136
 137 extern bfd *stdoutput;
 138 typedef bfd_vma addressT;
 139 typedef bfd_signed_vma offsetT;
 140
 141 /* Type of symbol value, etc.  For use in prototypes.  */
 142 typedef addressT valueT;
 143
 144 #ifndef COMMON
 145 #ifdef TEST
 146 #define COMMON                  /* Declare our COMMONs storage here.  */
 147 #else
 148 #define COMMON extern           /* Our commons live elsewhere.  */
 149 #endif
 150 #endif
 151 /* COMMON now defined */
 152
 153 #ifndef ENABLE_CHECKING
 154 #define ENABLE_CHECKING 0
 155 #endif
 156
 157 #if ENABLE_CHECKING || defined (DEBUG)
 158 #ifndef know
 159 #define know(p) gas_assert(p)   /* Verify our assumptions!  */
 160 #endif /* not yet defined */
 161 #else
 162 #define know(p) do {} while (0) /* know() checks are no-op.ed  */
 163 #endif
 164 \f
 165 /* input_scrub.c */
 166
 167 /* Supplies sanitised buffers to read.c.
 168    Also understands printing line-number part of error messages.  */
 169 \f
 170 /* subsegs.c     Sub-segments. Also, segment(=expression type)s.*/
 171
 172 typedef asection *segT;
 173 #define SEG_NORMAL(SEG)         (   (SEG) != absolute_section   \
 174                                  && (SEG) != undefined_section  \
 175                                  && (SEG) != reg_section        \
 176                                  && (SEG) != expr_section)
 177 typedef int subsegT;
 178
 179 /* What subseg we are accessing now?  */
 180 COMMON subsegT now_subseg;
 181
 182 /* Segment our instructions emit to.  */
 183 COMMON segT now_seg;
 184
 185 #define segment_name(SEG)       bfd_section_name (SEG)
 186
 187 extern segT reg_section, expr_section;
 188 /* Shouldn't these be eliminated someday?  */
 189 extern segT text_section, data_section, bss_section;
 190 #define absolute_section        bfd_abs_section_ptr
 191 #define undefined_section       bfd_und_section_ptr
 192
 193 enum _relax_state
 194 {
 195   /* Dummy frag used by listing code.  */
 196   rs_dummy = 0,
 197
 198   /* Variable chars to be repeated fr_offset times.
 199      Fr_symbol unused. Used with fr_offset == 0 for a
 200      constant length frag.  */
 201   rs_fill,
 202
 203   /* Align.  The fr_offset field holds the power of 2 to which to
 204      align.  The fr_var field holds the number of characters in the
 205      fill pattern.  The fr_subtype field holds the maximum number of
 206      bytes to skip when aligning, or 0 if there is no maximum.  */
 207   rs_align,
 208
 209   /* Align code.  The fr_offset field holds the power of 2 to which
 210      to align.  This type is only generated by machine specific
 211      code, which is normally responsible for handling the fill
 212      pattern.  The fr_subtype field holds the maximum number of
 213      bytes to skip when aligning, or 0 if there is no maximum.  */
 214   rs_align_code,
 215
 216   /* Test for alignment.  Like rs_align, but used by several targets
 217      to warn if data is not properly aligned.  */
 218   rs_align_test,
 219
 220   /* Org: Fr_offset, fr_symbol: address. 1 variable char: fill
 221      character.  */
 222   rs_org,
 223
 224 #ifndef WORKING_DOT_WORD
 225   /* JF: gunpoint */
 226   rs_broken_word,
 227 #endif
 228
 229   /* Machine specific relaxable (or similarly alterable) instruction.  */
 230   rs_machine_dependent,
 231
 232   /* .space directive with expression operand that needs to be computed
 233      later.  Similar to rs_org, but different.
 234      fr_symbol: operand
 235      1 variable char: fill character  */
 236   rs_space,
 237
 238   /* .nop directive with expression operand that needs to be computed
 239      later.  Similar to rs_space, but different.  It fills with no-op
 240      instructions.
 241      fr_symbol: operand
 242      1 constant byte: no-op fill control byte.  */
 243   rs_space_nop,
 244
 245   /* Similar to rs_fill.  It is used to implement .nop directive .  */
 246   rs_fill_nop,
 247
 248   /* A DWARF leb128 value; only ELF uses this.  The subtype is 0 for
 249      unsigned, 1 for signed.  */
 250   rs_leb128,
 251
 252   /* Exception frame information which we may be able to optimize.  */
 253   rs_cfa,
 254
 255   /* Cross-fragment dwarf2 line number optimization.  */
 256   rs_dwarf2dbg
 257 };
 258
 259 typedef enum _relax_state relax_stateT;
 260
 261 /* This type is used in prototypes, so it can't be a type that will be
 262    widened for argument passing.  */
 263 typedef unsigned int relax_substateT;
 264
 265 /* Enough bits for address, but still an integer type.
 266    Could be a problem, cross-assembling for 64-bit machines.  */
 267 typedef addressT relax_addressT;
 268
 269 struct relax_type
 270 {
 271   /* Forward reach. Signed number. > 0.  */
 272   offsetT rlx_forward;
 273   /* Backward reach. Signed number. < 0.  */
 274   offsetT rlx_backward;
 275
 276   /* Bytes length of this address.  */
 277   unsigned char rlx_length;
 278
 279   /* Next longer relax-state.  0 means there is no 'next' relax-state.  */
 280   relax_substateT rlx_more;
 281 };
 282
 283 typedef struct relax_type relax_typeS;
 284 \f
 285 /* main program "as.c" (command arguments etc).  */
 286
 287 COMMON unsigned char flag_no_comments; /* -f */
 288 COMMON unsigned char flag_debug; /* -D */
 289 COMMON unsigned char flag_signed_overflow_ok; /* -J */
 290 #ifndef WORKING_DOT_WORD
 291 COMMON unsigned char flag_warn_displacement; /* -K */
 292 #endif
 293
 294 /* True if local symbols should be retained.  */
 295 COMMON int flag_keep_locals; /* -L */
 296
 297 /* True if we are assembling in MRI mode.  */
 298 COMMON int flag_mri;
 299
 300 /* Should the data section be made read-only and appended to the text
 301    section?  */
 302 COMMON unsigned char flag_readonly_data_in_text; /* -R */
 303
 304 /* True if warnings should be inhibited.  */
 305 COMMON int flag_no_warnings; /* -W */
 306
 307 /* True if warnings count as errors.  */
 308 COMMON int flag_fatal_warnings; /* --fatal-warnings */
 309
 310 /* True if we should attempt to generate output even if non-fatal errors
 311    are detected.  */
 312 COMMON unsigned char flag_always_generate_output; /* -Z */
 313
 314 /* This is true if the assembler should output time and space usage.  */
 315 COMMON unsigned char flag_print_statistics;
 316
 317 /* True if local absolute symbols are to be stripped.  */
 318 COMMON int flag_strip_local_absolute;
 319
 320 /* True if we should generate a traditional format object file.  */
 321 COMMON int flag_traditional_format;
 322
 323 /* Type of compressed debug sections we should generate.   */
 324 COMMON enum compressed_debug_section_type flag_compress_debug;
 325
 326 /* TRUE if .note.GNU-stack section with SEC_CODE should be created */
 327 COMMON int flag_execstack;
 328
 329 /* TRUE if .note.GNU-stack section with SEC_CODE should be created */
 330 COMMON int flag_noexecstack;
 331
 332 /* name of emitted object file */
 333 COMMON const char *out_file_name;
 334
 335 /* name of file defining extensions to the basic instruction set */
 336 COMMON char *insttbl_file_name;
 337
 338 /* TRUE if we need a second pass.  */
 339 COMMON int need_pass_2;
 340
 341 /* TRUE if we should do no relaxing, and
 342    leave lots of padding.  */
 343 COMMON int linkrelax;
 344
 345 COMMON int do_not_pad_sections_to_alignment;
 346
 347 /* TRUE if we should produce a listing.  */
 348 extern int listing;
 349
 350 /* Type of debugging information we should generate.  We currently support
 351    stabs, ECOFF, and DWARF2.
 352
 353    NOTE!  This means debug information about the assembly source code itself
 354    and _not_ about possible debug information from a high-level language.
 355    This is especially relevant to DWARF2, since the compiler may emit line
 356    number directives that the assembler resolves.  */
 357
 358 enum debug_info_type
 359 {
 360   DEBUG_UNSPECIFIED,
 361   DEBUG_NONE,
 362   DEBUG_STABS,
 363   DEBUG_ECOFF,
 364   DEBUG_DWARF,
 365   DEBUG_DWARF2
 366 };
 367
 368 extern enum debug_info_type debug_type;
 369 extern int use_gnu_debug_info_extensions;
 370 COMMON bool flag_dwarf_sections;
 371 extern int flag_dwarf_cie_version;
 372 extern unsigned int dwarf_level;
 373 \f
 374 /* Maximum level of macro nesting.  */
 375 extern int max_macro_nest;
 376
 377 /* Verbosity level.  */
 378 extern int verbose;
 379
 380 /* Obstack chunk size.  Keep large for efficient space use, make small to
 381    increase malloc calls for monitoring memory allocation.  */
 382 extern int chunksize;
 383
 384 struct _pseudo_type
 385 {
 386   /* assembler mnemonic, lower case, no '.' */
 387   const char *poc_name;
 388   /* Do the work */
 389   void (*poc_handler) (int);
 390   /* Value to pass to handler */
 391   int poc_val;
 392 };
 393
 394 typedef struct _pseudo_type pseudo_typeS;
 395
 396 #if (__GNUC__ >= 2) && !defined(VMS)
 397 /* for use with -Wformat */
 398
 399 #if __GNUC__ == 2 && __GNUC_MINOR__ < 6
 400 /* Support for double underscores in attribute names was added in gcc
 401    2.6, so avoid them if we are using an earlier version.  */
 402 #define __printf__ printf
 403 #define __format__ format
 404 #endif
 405
 406 #define PRINTF_LIKE(FCN) \
 407   void FCN (const char *format, ...) \
 408     __attribute__ ((__format__ (__printf__, 1, 2)))
 409 #define PRINTF_WHERE_LIKE(FCN) \
 410   void FCN (const char *file, unsigned int line, const char *format, ...) \
 411     __attribute__ ((__format__ (__printf__, 3, 4)))
 412
 413 #else /* __GNUC__ < 2 || defined(VMS) */
 414
 415 #define PRINTF_LIKE(FCN)        void FCN (const char *format, ...)
 416 #define PRINTF_WHERE_LIKE(FCN)  void FCN (const char *file, \
 417                                           unsigned int line, \
 418                                           const char *format, ...)
 419
 420 #endif /* __GNUC__ < 2 || defined(VMS) */
 421
 422 PRINTF_LIKE (as_bad);
 423 PRINTF_LIKE (as_fatal) ATTRIBUTE_NORETURN;
 424 PRINTF_LIKE (as_tsktsk);
 425 PRINTF_LIKE (as_warn);
 426 PRINTF_WHERE_LIKE (as_bad_where);
 427 PRINTF_WHERE_LIKE (as_warn_where);
 428
 429 void   as_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 430 void   signal_init (void);
 431 int    had_errors (void);
 432 int    had_warnings (void);
 433 void   as_warn_value_out_of_range (const char *, offsetT, offsetT, offsetT,
 434                                    const char *, unsigned);
 435 void   as_bad_value_out_of_range (const char *, offsetT, offsetT, offsetT,
 436                                   const char *, unsigned);
 437 void   print_version_id (void);
 438 char * app_push (void);
 439
 440 /* Number of littlenums required to hold an extended precision number.  */
 441 #define MAX_LITTLENUMS 6
 442
 443 char * atof_ieee (char *, int, LITTLENUM_TYPE *);
 444 char * atof_ieee_detail (char *, int, int, LITTLENUM_TYPE *, FLONUM_TYPE *);
 445 const char * ieee_md_atof (int, char *, int *, bool);
 446 const char * vax_md_atof (int, char *, int *);
 447 char * input_scrub_include_file (const char *, char *);
 448 void   input_scrub_insert_line (const char *);
 449 void   input_scrub_insert_file (char *);
 450 char * input_scrub_new_file (const char *);
 451 char * input_scrub_next_buffer (char **bufp);
 452 size_t do_scrub_chars (size_t (*get) (char *, size_t), char *, size_t);
 453 int    gen_to_words (LITTLENUM_TYPE *, int, long);
 454 int    had_err (void);
 455 int    ignore_input (void);
 456 void   cond_finish_check (int);
 457 void   cond_exit_macro (int);
 458 int    seen_at_least_1_file (void);
 459 void   app_pop (char *);
 460 const char * as_where (unsigned int *);
 461 const char * as_where_physical (unsigned int *);
 462 void   bump_line_counters (void);
 463 void   do_scrub_begin (int);
 464 void   input_scrub_begin (void);
 465 void   input_scrub_close (void);
 466 void   input_scrub_end (void);
 467 int    new_logical_line (const char *, int);
 468 int    new_logical_line_flags (const char *, int, int);
 469 void   subsegs_begin (void);
 470 void   subseg_change (segT, int);
 471 segT   subseg_new (const char *, subsegT);
 472 segT   subseg_force_new (const char *, subsegT);
 473 void   subseg_set (segT, subsegT);
 474 int    subseg_text_p (segT);
 475 int    seg_not_empty_p (segT);
 476 void   start_dependencies (char *);
 477 void   register_dependency (const char *);
 478 void   print_dependencies (void);
 479 segT   subseg_get (const char *, int);
 480
 481 const char *remap_debug_filename (const char *);
 482 void add_debug_prefix_map (const char *);
 483
 484 static inline char *
 485 xmemdup0 (const char *in, size_t len)
 486 {
 487   char *out = (char *) xmalloc (len + 1);
 488   out[len] = 0;
 489   return (char *) memcpy (out, in, len);
 490 }
 491
 492 struct expressionS;
 493 struct fix;
 494 typedef struct symbol symbolS;
 495 typedef struct frag fragS;
 496
 497 /* literal.c */
 498 valueT add_to_literal_pool (symbolS *, valueT, segT, int);
 499
 500 int check_eh_frame (struct expressionS *, unsigned int *);
 501 int eh_frame_estimate_size_before_relax (fragS *);
 502 int eh_frame_relax_frag (fragS *);
 503 void eh_frame_convert_frag (fragS *);
 504 int generic_force_reloc (struct fix *);
 505
 506 #include "expr.h"               /* Before targ-*.h */
 507
 508 /* This one starts the chain of target dependent headers.  */
 509 #include "targ-env.h"
 510
 511 #ifdef OBJ_MAYBE_ELF
 512 #define IS_ELF (OUTPUT_FLAVOR == bfd_target_elf_flavour)
 513 #else
 514 #ifdef OBJ_ELF
 515 #define IS_ELF 1
 516 #else
 517 #define IS_ELF 0
 518 #endif
 519 #endif
 520
 521 #include "write.h"
 522 #include "frags.h"
 523 #include "hashtab.h"
 524 #include "hash.h"
 525 #include "read.h"
 526 #include "symbols.h"
 527
 528 #include "tc.h"
 529 #include "obj.h"
 530
 531 #ifdef USE_EMULATIONS
 532 #include "emul.h"
 533 #endif
 534 #include "listing.h"
 535
 536 #ifdef H_TICK_HEX
 537 extern int enable_h_tick_hex;
 538 #endif
 539
 540 #ifdef TC_M68K
 541 /* True if we are assembling in m68k MRI mode.  */
 542 COMMON int flag_m68k_mri;
 543 #define DOLLAR_AMBIGU flag_m68k_mri
 544 #else
 545 #define flag_m68k_mri 0
 546 #endif
 547
 548 #ifndef TC_STRING_ESCAPES
 549 #define TC_STRING_ESCAPES 1
 550 #endif
 551
 552 #ifdef WARN_COMMENTS
 553 COMMON int           warn_comment;
 554 COMMON unsigned int  found_comment;
 555 COMMON const char *        found_comment_file;
 556 #endif
 557
 558 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 559 /* If .size directive failure should be error or warning.  */
 560 COMMON int flag_allow_nonconst_size;
 561
 562 /* If we should generate ELF common symbols with the STT_COMMON type.  */
 563 extern int flag_use_elf_stt_common;
 564
 565 /* TRUE iff GNU Build attribute notes should
 566    be generated if none are in the input files.  */
 567 extern bool flag_generate_build_notes;
 568
 569 /* If section name substitution sequences should be honored */
 570 COMMON int flag_sectname_subst;
 571 #endif
 572
 573 #ifndef DOLLAR_AMBIGU
 574 #define DOLLAR_AMBIGU 0
 575 #endif
 576
 577 #ifndef NUMBERS_WITH_SUFFIX
 578 #define NUMBERS_WITH_SUFFIX 0
 579 #endif
 580
 581 #ifndef LOCAL_LABELS_DOLLAR
 582 #define LOCAL_LABELS_DOLLAR 0
 583 #endif
 584
 585 #ifndef LOCAL_LABELS_FB
 586 #define LOCAL_LABELS_FB 0
 587 #endif
 588
 589 #ifndef LABELS_WITHOUT_COLONS
 590 #define LABELS_WITHOUT_COLONS 0
 591 #endif
 592
 593 #ifndef NO_PSEUDO_DOT
 594 #define NO_PSEUDO_DOT 0
 595 #endif
 596
 597 #ifndef TEXT_SECTION_NAME
 598 #define TEXT_SECTION_NAME       ".text"
 599 #define DATA_SECTION_NAME       ".data"
 600 #define BSS_SECTION_NAME        ".bss"
 601 #endif
 602
 603 #ifndef OCTETS_PER_BYTE_POWER
 604 #define OCTETS_PER_BYTE_POWER 0
 605 #endif
 606 #ifndef OCTETS_PER_BYTE
 607 #define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
 608 #endif
 609 #if OCTETS_PER_BYTE != (1<<OCTETS_PER_BYTE_POWER)
 610  #error "Octets per byte conflicts with its power-of-two definition!"
 611 #endif
 612
 613 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 614 /* On ELF platforms, mark debug sections with SEC_ELF_OCTETS */
 615 #define SEC_OCTETS (IS_ELF ? SEC_ELF_OCTETS : 0)
 616 #else
 617 #define SEC_OCTETS 0
 618 #endif
 619
 620 #define POISON_BFD_BOOLEAN 1
 621
 622 #endif /* GAS */