gas/as.h

   1 /* as.h - global header file
   2    Copyright (C) 1987-2019 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  23 /* I think this stuff is largely out of date.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 "alloca-conf.h"
  38
  39 /* Now, tend to the rest of the configuration.  */
  40
  41 /* System include files first...  */
  42 #include <stdio.h>
  43
  44 #ifdef STRING_WITH_STRINGS
  45 #include <string.h>
  46 #include <strings.h>
  47 #else
  48 #ifdef HAVE_STRING_H
  49 #include <string.h>
  50 #else
  51 #ifdef HAVE_STRINGS_H
  52 #include <strings.h>
  53 #endif
  54 #endif
  55 #endif
  56
  57 #ifdef HAVE_STDLIB_H
  58 #include <stdlib.h>
  59 #endif
  60 #ifdef HAVE_UNISTD_H
  61 #include <unistd.h>
  62 #endif
  63 #ifdef HAVE_SYS_TYPES_H
  64 /* for size_t, pid_t */
  65 #include <sys/types.h>
  66 #endif
  67
  68 #ifdef HAVE_ERRNO_H
  69 #include <errno.h>
  70 #endif
  71
  72 #include <stdarg.h>
  73
  74 #include "getopt.h"
  75 /* The first getopt value for machine-independent long options.
  76    150 isn't special; it's just an arbitrary non-ASCII char value.  */
  77 #define OPTION_STD_BASE 150
  78 /* The first getopt value for machine-dependent long options.
  79    290 gives the standard options room to grow.  */
  80 #define OPTION_MD_BASE  290
  81
  82 #ifdef DEBUG
  83 #undef NDEBUG
  84 #endif
  85 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
  86 #define __PRETTY_FUNCTION__  ((char *) NULL)
  87 #endif
  88 #define gas_assert(P)   ((void) ((P) ? 0 : (abort (), 0)))
  89 #undef abort
  90 #define abort()         as_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
  91
  92 /* Now GNU header files...  */
  93 #include "ansidecl.h"
  94 #include "bfd.h"
  95 #include "libiberty.h"
  96
  97 /* Define the standard progress macros.  */
  98 #include "progress.h"
  99
 100 /* Other stuff from config.h.  */
 101 #ifdef NEED_DECLARATION_ENVIRON
 102 extern char **environ;
 103 #endif
 104 #ifdef NEED_DECLARATION_ERRNO
 105 extern int errno;
 106 #endif
 107 #ifdef NEED_DECLARATION_FFS
 108 extern int ffs (int);
 109 #endif
 110 #ifdef NEED_DECLARATION_FREE
 111 extern void free ();
 112 #endif
 113 #ifdef NEED_DECLARATION_MALLOC
 114 extern void *malloc ();
 115 extern void *realloc ();
 116 #endif
 117 #ifdef NEED_DECLARATION_STRSTR
 118 extern char *strstr ();
 119 #endif
 120
 121 #if !HAVE_DECL_MEMPCPY
 122 void *mempcpy(void *, const void *, size_t);
 123 #endif
 124
 125 #if !HAVE_DECL_VSNPRINTF
 126 extern int vsnprintf(char *, size_t, const char *, va_list);
 127 #endif
 128
 129 /* This is needed for VMS.  */
 130 #if ! defined (HAVE_UNLINK) && defined (HAVE_REMOVE)
 131 #define unlink remove
 132 #endif
 133
 134 /* Hack to make "gcc -Wall" not complain about obstack macros.  */
 135 #if !defined (memcpy) && !defined (bcopy)
 136 #define bcopy(src,dest,size)    memcpy (dest, src, size)
 137 #endif
 138
 139 #ifndef __LINE__
 140 #define __LINE__ "unknown"
 141 #endif /* __LINE__ */
 142
 143 #ifndef __FILE__
 144 #define __FILE__ "unknown"
 145 #endif /* __FILE__ */
 146
 147 #ifndef FOPEN_WB
 148 #ifdef USE_BINARY_FOPEN
 149 #include "fopen-bin.h"
 150 #else
 151 #include "fopen-same.h"
 152 #endif
 153 #endif
 154
 155 #ifndef EXIT_SUCCESS
 156 #define EXIT_SUCCESS 0
 157 #define EXIT_FAILURE 1
 158 #endif
 159
 160 #ifndef SEEK_SET
 161 #define SEEK_SET 0
 162 #endif
 163
 164 #define obstack_chunk_alloc xmalloc
 165 #define obstack_chunk_free xfree
 166
 167 #define xfree free
 168
 169 #include "asintl.h"
 170
 171 #define BAD_CASE(val)                                                       \
 172   {                                                                         \
 173     as_fatal (_("Case value %ld unexpected at line %d of file \"%s\"\n"),   \
 174               (long) val, __LINE__, __FILE__);                              \
 175   }
 176 \f
 177 #include "flonum.h"
 178
 179 /* These are assembler-wide concepts */
 180
 181 extern bfd *stdoutput;
 182 typedef bfd_vma addressT;
 183 typedef bfd_signed_vma offsetT;
 184
 185 /* Type of symbol value, etc.  For use in prototypes.  */
 186 typedef addressT valueT;
 187
 188 #ifndef COMMON
 189 #ifdef TEST
 190 #define COMMON                  /* Declare our COMMONs storage here.  */
 191 #else
 192 #define COMMON extern           /* Our commons live elsewhere.  */
 193 #endif
 194 #endif
 195 /* COMMON now defined */
 196
 197 #ifndef ENABLE_CHECKING
 198 #define ENABLE_CHECKING 0
 199 #endif
 200
 201 #if ENABLE_CHECKING || defined (DEBUG)
 202 #ifndef know
 203 #define know(p) gas_assert(p)   /* Verify our assumptions!  */
 204 #endif /* not yet defined */
 205 #else
 206 #define know(p) do {} while (0) /* know() checks are no-op.ed  */
 207 #endif
 208 \f
 209 /* input_scrub.c */
 210
 211 /* Supplies sanitised buffers to read.c.
 212    Also understands printing line-number part of error messages.  */
 213 \f
 214 /* subsegs.c     Sub-segments. Also, segment(=expression type)s.*/
 215
 216 typedef asection *segT;
 217 #define SEG_NORMAL(SEG)         (   (SEG) != absolute_section   \
 218                                  && (SEG) != undefined_section  \
 219                                  && (SEG) != reg_section        \
 220                                  && (SEG) != expr_section)
 221 typedef int subsegT;
 222
 223 /* What subseg we are accessing now?  */
 224 COMMON subsegT now_subseg;
 225
 226 /* Segment our instructions emit to.  */
 227 COMMON segT now_seg;
 228
 229 #define segment_name(SEG)       bfd_section_name (SEG)
 230
 231 extern segT reg_section, expr_section;
 232 /* Shouldn't these be eliminated someday?  */
 233 extern segT text_section, data_section, bss_section;
 234 #define absolute_section        bfd_abs_section_ptr
 235 #define undefined_section       bfd_und_section_ptr
 236
 237 enum _relax_state
 238 {
 239   /* Dummy frag used by listing code.  */
 240   rs_dummy = 0,
 241
 242   /* Variable chars to be repeated fr_offset times.
 243      Fr_symbol unused. Used with fr_offset == 0 for a
 244      constant length frag.  */
 245   rs_fill,
 246
 247   /* Align.  The fr_offset field holds the power of 2 to which to
 248      align.  The fr_var field holds the number of characters in the
 249      fill pattern.  The fr_subtype field holds the maximum number of
 250      bytes to skip when aligning, or 0 if there is no maximum.  */
 251   rs_align,
 252
 253   /* Align code.  The fr_offset field holds the power of 2 to which
 254      to align.  This type is only generated by machine specific
 255      code, which is normally responsible for handling the fill
 256      pattern.  The fr_subtype field holds the maximum number of
 257      bytes to skip when aligning, or 0 if there is no maximum.  */
 258   rs_align_code,
 259
 260   /* Test for alignment.  Like rs_align, but used by several targets
 261      to warn if data is not properly aligned.  */
 262   rs_align_test,
 263
 264   /* Org: Fr_offset, fr_symbol: address. 1 variable char: fill
 265      character.  */
 266   rs_org,
 267
 268 #ifndef WORKING_DOT_WORD
 269   /* JF: gunpoint */
 270   rs_broken_word,
 271 #endif
 272
 273   /* Machine specific relaxable (or similarly alterable) instruction.  */
 274   rs_machine_dependent,
 275
 276   /* .space directive with expression operand that needs to be computed
 277      later.  Similar to rs_org, but different.
 278      fr_symbol: operand
 279      1 variable char: fill character  */
 280   rs_space,
 281
 282   /* .nop directive with expression operand that needs to be computed
 283      later.  Similar to rs_space, but different.  It fills with no-op
 284      instructions.
 285      fr_symbol: operand
 286      1 constant byte: no-op fill control byte.  */
 287   rs_space_nop,
 288
 289   /* Similar to rs_fill.  It is used to implement .nop directive .  */
 290   rs_fill_nop,
 291
 292   /* A DWARF leb128 value; only ELF uses this.  The subtype is 0 for
 293      unsigned, 1 for signed.  */
 294   rs_leb128,
 295
 296   /* Exception frame information which we may be able to optimize.  */
 297   rs_cfa,
 298
 299   /* Cross-fragment dwarf2 line number optimization.  */
 300   rs_dwarf2dbg
 301 };
 302
 303 typedef enum _relax_state relax_stateT;
 304
 305 /* This type is used in prototypes, so it can't be a type that will be
 306    widened for argument passing.  */
 307 typedef unsigned int relax_substateT;
 308
 309 /* Enough bits for address, but still an integer type.
 310    Could be a problem, cross-assembling for 64-bit machines.  */
 311 typedef addressT relax_addressT;
 312
 313 struct relax_type
 314 {
 315   /* Forward reach. Signed number. > 0.  */
 316   offsetT rlx_forward;
 317   /* Backward reach. Signed number. < 0.  */
 318   offsetT rlx_backward;
 319
 320   /* Bytes length of this address.  */
 321   unsigned char rlx_length;
 322
 323   /* Next longer relax-state.  0 means there is no 'next' relax-state.  */
 324   relax_substateT rlx_more;
 325 };
 326
 327 typedef struct relax_type relax_typeS;
 328 \f
 329 /* main program "as.c" (command arguments etc).  */
 330
 331 COMMON unsigned char flag_no_comments; /* -f */
 332 COMMON unsigned char flag_debug; /* -D */
 333 COMMON unsigned char flag_signed_overflow_ok; /* -J */
 334 #ifndef WORKING_DOT_WORD
 335 COMMON unsigned char flag_warn_displacement; /* -K */
 336 #endif
 337
 338 /* True if local symbols should be retained.  */
 339 COMMON int flag_keep_locals; /* -L */
 340
 341 /* True if we are assembling in MRI mode.  */
 342 COMMON int flag_mri;
 343
 344 /* Should the data section be made read-only and appended to the text
 345    section?  */
 346 COMMON unsigned char flag_readonly_data_in_text; /* -R */
 347
 348 /* True if warnings should be inhibited.  */
 349 COMMON int flag_no_warnings; /* -W */
 350
 351 /* True if warnings count as errors.  */
 352 COMMON int flag_fatal_warnings; /* --fatal-warnings */
 353
 354 /* True if we should attempt to generate output even if non-fatal errors
 355    are detected.  */
 356 COMMON unsigned char flag_always_generate_output; /* -Z */
 357
 358 /* This is true if the assembler should output time and space usage.  */
 359 COMMON unsigned char flag_print_statistics;
 360
 361 /* True if local absolute symbols are to be stripped.  */
 362 COMMON int flag_strip_local_absolute;
 363
 364 /* True if we should generate a traditional format object file.  */
 365 COMMON int flag_traditional_format;
 366
 367 /* Type of compressed debug sections we should generate.   */
 368 COMMON enum compressed_debug_section_type flag_compress_debug;
 369
 370 /* TRUE if .note.GNU-stack section with SEC_CODE should be created */
 371 COMMON int flag_execstack;
 372
 373 /* TRUE if .note.GNU-stack section with SEC_CODE should be created */
 374 COMMON int flag_noexecstack;
 375
 376 /* name of emitted object file */
 377 COMMON const char *out_file_name;
 378
 379 /* name of file defining extensions to the basic instruction set */
 380 COMMON char *insttbl_file_name;
 381
 382 /* TRUE if we need a second pass.  */
 383 COMMON int need_pass_2;
 384
 385 /* TRUE if we should do no relaxing, and
 386    leave lots of padding.  */
 387 COMMON int linkrelax;
 388
 389 COMMON int do_not_pad_sections_to_alignment;
 390
 391 /* TRUE if we should produce a listing.  */
 392 extern int listing;
 393
 394 /* Type of debugging information we should generate.  We currently support
 395    stabs, ECOFF, and DWARF2.
 396
 397    NOTE!  This means debug information about the assembly source code itself
 398    and _not_ about possible debug information from a high-level language.
 399    This is especially relevant to DWARF2, since the compiler may emit line
 400    number directives that the assembler resolves.  */
 401
 402 enum debug_info_type
 403 {
 404   DEBUG_UNSPECIFIED,
 405   DEBUG_NONE,
 406   DEBUG_STABS,
 407   DEBUG_ECOFF,
 408   DEBUG_DWARF,
 409   DEBUG_DWARF2
 410 };
 411
 412 extern enum debug_info_type debug_type;
 413 extern int use_gnu_debug_info_extensions;
 414 COMMON bfd_boolean flag_dwarf_sections;
 415 extern int flag_dwarf_cie_version;
 416 \f
 417 /* Maximum level of macro nesting.  */
 418 extern int max_macro_nest;
 419
 420 /* Verbosity level.  */
 421 extern int verbose;
 422
 423 /* Obstack chunk size.  Keep large for efficient space use, make small to
 424    increase malloc calls for monitoring memory allocation.  */
 425 extern int chunksize;
 426
 427 struct _pseudo_type
 428 {
 429   /* assembler mnemonic, lower case, no '.' */
 430   const char *poc_name;
 431   /* Do the work */
 432   void (*poc_handler) (int);
 433   /* Value to pass to handler */
 434   int poc_val;
 435 };
 436
 437 typedef struct _pseudo_type pseudo_typeS;
 438
 439 #if (__GNUC__ >= 2) && !defined(VMS)
 440 /* for use with -Wformat */
 441
 442 #if __GNUC__ == 2 && __GNUC_MINOR__ < 6
 443 /* Support for double underscores in attribute names was added in gcc
 444    2.6, so avoid them if we are using an earlier version.  */
 445 #define __printf__ printf
 446 #define __format__ format
 447 #endif
 448
 449 #define PRINTF_LIKE(FCN) \
 450   void FCN (const char *format, ...) \
 451     __attribute__ ((__format__ (__printf__, 1, 2)))
 452 #define PRINTF_WHERE_LIKE(FCN) \
 453   void FCN (const char *file, unsigned int line, const char *format, ...) \
 454     __attribute__ ((__format__ (__printf__, 3, 4)))
 455
 456 #else /* __GNUC__ < 2 || defined(VMS) */
 457
 458 #define PRINTF_LIKE(FCN)        void FCN (const char *format, ...)
 459 #define PRINTF_WHERE_LIKE(FCN)  void FCN (const char *file, \
 460                                           unsigned int line, \
 461                                           const char *format, ...)
 462
 463 #endif /* __GNUC__ < 2 || defined(VMS) */
 464
 465 PRINTF_LIKE (as_bad);
 466 PRINTF_LIKE (as_fatal) ATTRIBUTE_NORETURN;
 467 PRINTF_LIKE (as_tsktsk);
 468 PRINTF_LIKE (as_warn);
 469 PRINTF_WHERE_LIKE (as_bad_where);
 470 PRINTF_WHERE_LIKE (as_warn_where);
 471
 472 void   as_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 473 void   signal_init (void);
 474 void   sprint_value (char *, addressT);
 475 int    had_errors (void);
 476 int    had_warnings (void);
 477 void   as_warn_value_out_of_range (const char *, offsetT, offsetT, offsetT,
 478                                    const char *, unsigned);
 479 void   as_bad_value_out_of_range (const char *, offsetT, offsetT, offsetT,
 480                                   const char *, unsigned);
 481 void   print_version_id (void);
 482 char * app_push (void);
 483
 484 /* Number of littlenums required to hold an extended precision number.  */
 485 #define MAX_LITTLENUMS 6
 486
 487 char * atof_ieee (char *, int, LITTLENUM_TYPE *);
 488 char * atof_ieee_detail (char *, int, int, LITTLENUM_TYPE *, FLONUM_TYPE *);
 489 const char * ieee_md_atof (int, char *, int *, bfd_boolean);
 490 const char * vax_md_atof (int, char *, int *);
 491 char * input_scrub_include_file (const char *, char *);
 492 void   input_scrub_insert_line (const char *);
 493 void   input_scrub_insert_file (char *);
 494 char * input_scrub_new_file (const char *);
 495 char * input_scrub_next_buffer (char **bufp);
 496 size_t do_scrub_chars (size_t (*get) (char *, size_t), char *, size_t);
 497 int    gen_to_words (LITTLENUM_TYPE *, int, long);
 498 int    had_err (void);
 499 int    ignore_input (void);
 500 void   cond_finish_check (int);
 501 void   cond_exit_macro (int);
 502 int    seen_at_least_1_file (void);
 503 void   app_pop (char *);
 504 const char * as_where (unsigned int *);
 505 const char * as_where_physical (unsigned int *);
 506 void   bump_line_counters (void);
 507 void   do_scrub_begin (int);
 508 void   input_scrub_begin (void);
 509 void   input_scrub_close (void);
 510 void   input_scrub_end (void);
 511 int    new_logical_line (const char *, int);
 512 int    new_logical_line_flags (const char *, int, int);
 513 void   subsegs_begin (void);
 514 void   subseg_change (segT, int);
 515 segT   subseg_new (const char *, subsegT);
 516 segT   subseg_force_new (const char *, subsegT);
 517 void   subseg_set (segT, subsegT);
 518 int    subseg_text_p (segT);
 519 int    seg_not_empty_p (segT);
 520 void   start_dependencies (char *);
 521 void   register_dependency (const char *);
 522 void   print_dependencies (void);
 523 segT   subseg_get (const char *, int);
 524
 525 const char *remap_debug_filename (const char *);
 526 void add_debug_prefix_map (const char *);
 527
 528 static inline char *
 529 xmemdup0 (const char *in, size_t len)
 530 {
 531   char *out = (char *) xmalloc (len + 1);
 532   out[len] = 0;
 533   return (char *) memcpy (out, in, len);
 534 }
 535
 536 struct expressionS;
 537 struct fix;
 538 typedef struct symbol symbolS;
 539 typedef struct frag fragS;
 540
 541 /* literal.c */
 542 valueT add_to_literal_pool (symbolS *, valueT, segT, int);
 543
 544 int check_eh_frame (struct expressionS *, unsigned int *);
 545 int eh_frame_estimate_size_before_relax (fragS *);
 546 int eh_frame_relax_frag (fragS *);
 547 void eh_frame_convert_frag (fragS *);
 548 int generic_force_reloc (struct fix *);
 549
 550 #include "expr.h"               /* Before targ-*.h */
 551
 552 /* This one starts the chain of target dependent headers.  */
 553 #include "targ-env.h"
 554
 555 #ifdef OBJ_MAYBE_ELF
 556 #define IS_ELF (OUTPUT_FLAVOR == bfd_target_elf_flavour)
 557 #else
 558 #ifdef OBJ_ELF
 559 #define IS_ELF 1
 560 #else
 561 #define IS_ELF 0
 562 #endif
 563 #endif
 564
 565 #include "write.h"
 566 #include "frags.h"
 567 #include "hash.h"
 568 #include "read.h"
 569 #include "symbols.h"
 570
 571 #include "tc.h"
 572 #include "obj.h"
 573
 574 #ifdef USE_EMULATIONS
 575 #include "emul.h"
 576 #endif
 577 #include "listing.h"
 578
 579 #ifdef H_TICK_HEX
 580 extern int enable_h_tick_hex;
 581 #endif
 582
 583 #ifdef TC_M68K
 584 /* True if we are assembling in m68k MRI mode.  */
 585 COMMON int flag_m68k_mri;
 586 #define DOLLAR_AMBIGU flag_m68k_mri
 587 #else
 588 #define flag_m68k_mri 0
 589 #endif
 590
 591 #ifdef WARN_COMMENTS
 592 COMMON int           warn_comment;
 593 COMMON unsigned int  found_comment;
 594 COMMON const char *        found_comment_file;
 595 #endif
 596
 597 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 598 /* If .size directive failure should be error or warning.  */
 599 COMMON int flag_allow_nonconst_size;
 600
 601 /* If we should generate ELF common symbols with the STT_COMMON type.  */
 602 extern int flag_use_elf_stt_common;
 603
 604 /* TRUE iff GNU Build attribute notes should
 605    be generated if none are in the input files.  */
 606 extern bfd_boolean flag_generate_build_notes;
 607
 608 /* If section name substitution sequences should be honored */
 609 COMMON int flag_sectname_subst;
 610 #endif
 611
 612 #ifndef DOLLAR_AMBIGU
 613 #define DOLLAR_AMBIGU 0
 614 #endif
 615
 616 #ifndef NUMBERS_WITH_SUFFIX
 617 #define NUMBERS_WITH_SUFFIX 0
 618 #endif
 619
 620 #ifndef LOCAL_LABELS_DOLLAR
 621 #define LOCAL_LABELS_DOLLAR 0
 622 #endif
 623
 624 #ifndef LOCAL_LABELS_FB
 625 #define LOCAL_LABELS_FB 0
 626 #endif
 627
 628 #ifndef LABELS_WITHOUT_COLONS
 629 #define LABELS_WITHOUT_COLONS 0
 630 #endif
 631
 632 #ifndef NO_PSEUDO_DOT
 633 #define NO_PSEUDO_DOT 0
 634 #endif
 635
 636 #ifndef TEXT_SECTION_NAME
 637 #define TEXT_SECTION_NAME       ".text"
 638 #define DATA_SECTION_NAME       ".data"
 639 #define BSS_SECTION_NAME        ".bss"
 640 #endif
 641
 642 #ifndef OCTETS_PER_BYTE_POWER
 643 #define OCTETS_PER_BYTE_POWER 0
 644 #endif
 645 #ifndef OCTETS_PER_BYTE
 646 #define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
 647 #endif
 648 #if OCTETS_PER_BYTE != (1<<OCTETS_PER_BYTE_POWER)
 649  #error "Octets per byte conflicts with its power-of-two definition!"
 650 #endif
 651
 652 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 653 /* On ELF platforms, mark debug sections with SEC_ELF_OCTETS */
 654 #define SEC_OCTETS (IS_ELF ? SEC_ELF_OCTETS : 0)
 655 #else
 656 #define SEC_OCTETS 0
 657 #endif
 658
 659 #endif /* GAS */