gas/as.h

   1 /* as.h - global header file
   2    Copyright (C) 1987-2017 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  23 /* I think this stuff is largely out of date.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) \
  89   ((void) ((P) ? 0 : (as_assert (__FILE__, __LINE__, __PRETTY_FUNCTION__), 0)))
  90 #undef abort
  91 #define abort()         as_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
  92
  93 /* Now GNU header files...  */
  94 #include "ansidecl.h"
  95 #include "bfd.h"
  96 #include "libiberty.h"
  97
  98 /* Define the standard progress macros.  */
  99 #include "progress.h"
 100
 101 /* Other stuff from config.h.  */
 102 #ifdef NEED_DECLARATION_ENVIRON
 103 extern char **environ;
 104 #endif
 105 #ifdef NEED_DECLARATION_ERRNO
 106 extern int errno;
 107 #endif
 108 #ifdef NEED_DECLARATION_FFS
 109 extern int ffs (int);
 110 #endif
 111 #ifdef NEED_DECLARATION_FREE
 112 extern void free ();
 113 #endif
 114 #ifdef NEED_DECLARATION_MALLOC
 115 extern void *malloc ();
 116 extern void *realloc ();
 117 #endif
 118 #ifdef NEED_DECLARATION_STRSTR
 119 extern char *strstr ();
 120 #endif
 121
 122 #if !HAVE_DECL_MEMPCPY
 123 void *mempcpy(void *, const void *, size_t);
 124 #endif
 125
 126 #if !HAVE_DECL_VSNPRINTF
 127 extern int vsnprintf(char *, size_t, const char *, va_list);
 128 #endif
 129
 130 /* This is needed for VMS.  */
 131 #if ! defined (HAVE_UNLINK) && defined (HAVE_REMOVE)
 132 #define unlink remove
 133 #endif
 134
 135 /* Hack to make "gcc -Wall" not complain about obstack macros.  */
 136 #if !defined (memcpy) && !defined (bcopy)
 137 #define bcopy(src,dest,size)    memcpy (dest, src, size)
 138 #endif
 139
 140 #ifndef __LINE__
 141 #define __LINE__ "unknown"
 142 #endif /* __LINE__ */
 143
 144 #ifndef __FILE__
 145 #define __FILE__ "unknown"
 146 #endif /* __FILE__ */
 147
 148 #ifndef FOPEN_WB
 149 #ifdef USE_BINARY_FOPEN
 150 #include "fopen-bin.h"
 151 #else
 152 #include "fopen-same.h"
 153 #endif
 154 #endif
 155
 156 #ifndef EXIT_SUCCESS
 157 #define EXIT_SUCCESS 0
 158 #define EXIT_FAILURE 1
 159 #endif
 160
 161 #ifndef SEEK_SET
 162 #define SEEK_SET 0
 163 #endif
 164
 165 #define obstack_chunk_alloc xmalloc
 166 #define obstack_chunk_free xfree
 167
 168 #define xfree free
 169
 170 #include "asintl.h"
 171
 172 #define BAD_CASE(val)                                                       \
 173   {                                                                         \
 174     as_fatal (_("Case value %ld unexpected at line %d of file \"%s\"\n"),   \
 175               (long) val, __LINE__, __FILE__);                              \
 176   }
 177 \f
 178 #include "flonum.h"
 179
 180 /* These are assembler-wide concepts */
 181
 182 extern bfd *stdoutput;
 183 typedef bfd_vma addressT;
 184 typedef bfd_signed_vma offsetT;
 185
 186 /* Type of symbol value, etc.  For use in prototypes.  */
 187 typedef addressT valueT;
 188
 189 #ifndef COMMON
 190 #ifdef TEST
 191 #define COMMON                  /* Declare our COMMONs storage here.  */
 192 #else
 193 #define COMMON extern           /* Our commons live elsewhere.  */
 194 #endif
 195 #endif
 196 /* COMMON now defined */
 197
 198 #ifndef ENABLE_CHECKING
 199 #define ENABLE_CHECKING 0
 200 #endif
 201
 202 #if ENABLE_CHECKING || defined (DEBUG)
 203 #ifndef know
 204 #define know(p) gas_assert(p)   /* Verify our assumptions!  */
 205 #endif /* not yet defined */
 206 #else
 207 #define know(p) do {} while (0) /* know() checks are no-op.ed  */
 208 #endif
 209 \f
 210 /* input_scrub.c */
 211
 212 /* Supplies sanitised buffers to read.c.
 213    Also understands printing line-number part of error messages.  */
 214 \f
 215 /* subsegs.c     Sub-segments. Also, segment(=expression type)s.*/
 216
 217 typedef asection *segT;
 218 #define SEG_NORMAL(SEG)         (   (SEG) != absolute_section   \
 219                                  && (SEG) != undefined_section  \
 220                                  && (SEG) != reg_section        \
 221                                  && (SEG) != expr_section)
 222 typedef int subsegT;
 223
 224 /* What subseg we are accessing now?  */
 225 COMMON subsegT now_subseg;
 226
 227 /* Segment our instructions emit to.  */
 228 COMMON segT now_seg;
 229
 230 #define segment_name(SEG)       bfd_get_section_name (stdoutput, SEG)
 231
 232 extern segT reg_section, expr_section;
 233 /* Shouldn't these be eliminated someday?  */
 234 extern segT text_section, data_section, bss_section;
 235 #define absolute_section        bfd_abs_section_ptr
 236 #define undefined_section       bfd_und_section_ptr
 237
 238 enum _relax_state
 239 {
 240   /* Dummy frag used by listing code.  */
 241   rs_dummy = 0,
 242
 243   /* Variable chars to be repeated fr_offset times.
 244      Fr_symbol unused. Used with fr_offset == 0 for a
 245      constant length frag.  */
 246   rs_fill,
 247
 248   /* Align.  The fr_offset field holds the power of 2 to which to
 249      align.  The fr_var field holds the number of characters in the
 250      fill pattern.  The fr_subtype field holds the maximum number of
 251      bytes to skip when aligning, or 0 if there is no maximum.  */
 252   rs_align,
 253
 254   /* Align code.  The fr_offset field holds the power of 2 to which
 255      to align.  This type is only generated by machine specific
 256      code, which is normally responsible for handling the fill
 257      pattern.  The fr_subtype field holds the maximum number of
 258      bytes to skip when aligning, or 0 if there is no maximum.  */
 259   rs_align_code,
 260
 261   /* Test for alignment.  Like rs_align, but used by several targets
 262      to warn if data is not properly aligned.  */
 263   rs_align_test,
 264
 265   /* Org: Fr_offset, fr_symbol: address. 1 variable char: fill
 266      character.  */
 267   rs_org,
 268
 269 #ifndef WORKING_DOT_WORD
 270   /* JF: gunpoint */
 271   rs_broken_word,
 272 #endif
 273
 274   /* Machine specific relaxable (or similarly alterable) instruction.  */
 275   rs_machine_dependent,
 276
 277   /* .space directive with expression operand that needs to be computed
 278      later.  Similar to rs_org, but different.
 279      fr_symbol: operand
 280      1 variable char: fill character  */
 281   rs_space,
 282
 283   /* A DWARF leb128 value; only ELF uses this.  The subtype is 0 for
 284      unsigned, 1 for signed.  */
 285   rs_leb128,
 286
 287   /* Exception frame information which we may be able to optimize.  */
 288   rs_cfa,
 289
 290   /* Cross-fragment dwarf2 line number optimization.  */
 291   rs_dwarf2dbg
 292 };
 293
 294 typedef enum _relax_state relax_stateT;
 295
 296 /* This type is used in prototypes, so it can't be a type that will be
 297    widened for argument passing.  */
 298 typedef unsigned int relax_substateT;
 299
 300 /* Enough bits for address, but still an integer type.
 301    Could be a problem, cross-assembling for 64-bit machines.  */
 302 typedef addressT relax_addressT;
 303
 304 struct relax_type
 305 {
 306   /* Forward reach. Signed number. > 0.  */
 307   offsetT rlx_forward;
 308   /* Backward reach. Signed number. < 0.  */
 309   offsetT rlx_backward;
 310
 311   /* Bytes length of this address.  */
 312   unsigned char rlx_length;
 313
 314   /* Next longer relax-state.  0 means there is no 'next' relax-state.  */
 315   relax_substateT rlx_more;
 316 };
 317
 318 typedef struct relax_type relax_typeS;
 319 \f
 320 /* main program "as.c" (command arguments etc).  */
 321
 322 COMMON unsigned char flag_no_comments; /* -f */
 323 COMMON unsigned char flag_debug; /* -D */
 324 COMMON unsigned char flag_signed_overflow_ok; /* -J */
 325 #ifndef WORKING_DOT_WORD
 326 COMMON unsigned char flag_warn_displacement; /* -K */
 327 #endif
 328
 329 /* True if local symbols should be retained.  */
 330 COMMON int flag_keep_locals; /* -L */
 331
 332 /* True if we are assembling in MRI mode.  */
 333 COMMON int flag_mri;
 334
 335 /* Should the data section be made read-only and appended to the text
 336    section?  */
 337 COMMON unsigned char flag_readonly_data_in_text; /* -R */
 338
 339 /* True if warnings should be inhibited.  */
 340 COMMON int flag_no_warnings; /* -W */
 341
 342 /* True if warnings count as errors.  */
 343 COMMON int flag_fatal_warnings; /* --fatal-warnings */
 344
 345 /* True if we should attempt to generate output even if non-fatal errors
 346    are detected.  */
 347 COMMON unsigned char flag_always_generate_output; /* -Z */
 348
 349 /* This is true if the assembler should output time and space usage.  */
 350 COMMON unsigned char flag_print_statistics;
 351
 352 /* True if local absolute symbols are to be stripped.  */
 353 COMMON int flag_strip_local_absolute;
 354
 355 /* True if we should generate a traditional format object file.  */
 356 COMMON int flag_traditional_format;
 357
 358 /* Type of compressed debug sections we should generate.   */
 359 COMMON enum compressed_debug_section_type flag_compress_debug;
 360
 361 /* TRUE if .note.GNU-stack section with SEC_CODE should be created */
 362 COMMON int flag_execstack;
 363
 364 /* TRUE if .note.GNU-stack section with SEC_CODE should be created */
 365 COMMON int flag_noexecstack;
 366
 367 /* name of emitted object file */
 368 COMMON const char *out_file_name;
 369
 370 /* name of file defining extensions to the basic instruction set */
 371 COMMON char *insttbl_file_name;
 372
 373 /* TRUE if we need a second pass.  */
 374 COMMON int need_pass_2;
 375
 376 /* TRUE if we should do no relaxing, and
 377    leave lots of padding.  */
 378 COMMON int linkrelax;
 379
 380 COMMON int do_not_pad_sections_to_alignment;
 381
 382 /* TRUE if we should produce a listing.  */
 383 extern int listing;
 384
 385 /* Type of debugging information we should generate.  We currently support
 386    stabs, ECOFF, and DWARF2.
 387
 388    NOTE!  This means debug information about the assembly source code itself
 389    and _not_ about possible debug information from a high-level language.
 390    This is especially relevant to DWARF2, since the compiler may emit line
 391    number directives that the assembler resolves.  */
 392
 393 enum debug_info_type
 394 {
 395   DEBUG_UNSPECIFIED,
 396   DEBUG_NONE,
 397   DEBUG_STABS,
 398   DEBUG_ECOFF,
 399   DEBUG_DWARF,
 400   DEBUG_DWARF2
 401 };
 402
 403 extern enum debug_info_type debug_type;
 404 extern int use_gnu_debug_info_extensions;
 405 COMMON bfd_boolean flag_dwarf_sections;
 406 \f
 407 /* Maximum level of macro nesting.  */
 408 extern int max_macro_nest;
 409
 410 /* Verbosity level.  */
 411 extern int verbose;
 412
 413 /* Obstack chunk size.  Keep large for efficient space use, make small to
 414    increase malloc calls for monitoring memory allocation.  */
 415 extern int chunksize;
 416
 417 struct _pseudo_type
 418 {
 419   /* assembler mnemonic, lower case, no '.' */
 420   const char *poc_name;
 421   /* Do the work */
 422   void (*poc_handler) (int);
 423   /* Value to pass to handler */
 424   int poc_val;
 425 };
 426
 427 typedef struct _pseudo_type pseudo_typeS;
 428
 429 #if (__GNUC__ >= 2) && !defined(VMS)
 430 /* for use with -Wformat */
 431
 432 #if __GNUC__ == 2 && __GNUC_MINOR__ < 6
 433 /* Support for double underscores in attribute names was added in gcc
 434    2.6, so avoid them if we are using an earlier version.  */
 435 #define __printf__ printf
 436 #define __format__ format
 437 #endif
 438
 439 #define PRINTF_LIKE(FCN) \
 440   void FCN (const char *format, ...) \
 441     __attribute__ ((__format__ (__printf__, 1, 2)))
 442 #define PRINTF_WHERE_LIKE(FCN) \
 443   void FCN (const char *file, unsigned int line, const char *format, ...) \
 444     __attribute__ ((__format__ (__printf__, 3, 4)))
 445
 446 #else /* __GNUC__ < 2 || defined(VMS) */
 447
 448 #define PRINTF_LIKE(FCN)        void FCN (const char *format, ...)
 449 #define PRINTF_WHERE_LIKE(FCN)  void FCN (const char *file, \
 450                                           unsigned int line, \
 451                                           const char *format, ...)
 452
 453 #endif /* __GNUC__ < 2 || defined(VMS) */
 454
 455 PRINTF_LIKE (as_bad);
 456 PRINTF_LIKE (as_fatal) ATTRIBUTE_NORETURN;
 457 PRINTF_LIKE (as_tsktsk);
 458 PRINTF_LIKE (as_warn);
 459 PRINTF_WHERE_LIKE (as_bad_where);
 460 PRINTF_WHERE_LIKE (as_warn_where);
 461
 462 void   as_assert (const char *, int, const char *) ATTRIBUTE_NORETURN;
 463 void   as_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 464 void   sprint_value (char *, addressT);
 465 int    had_errors (void);
 466 int    had_warnings (void);
 467 void   as_warn_value_out_of_range (const char *, offsetT, offsetT, offsetT,
 468                                    const char *, unsigned);
 469 void   as_bad_value_out_of_range (const char *, offsetT, offsetT, offsetT,
 470                                   const char *, unsigned);
 471 void   print_version_id (void);
 472 char * app_push (void);
 473 char * atof_ieee (char *, int, LITTLENUM_TYPE *);
 474 const char * ieee_md_atof (int, char *, int *, bfd_boolean);
 475 const char * vax_md_atof (int, char *, int *);
 476 char * input_scrub_include_file (const char *, char *);
 477 void   input_scrub_insert_line (const char *);
 478 void   input_scrub_insert_file (char *);
 479 char * input_scrub_new_file (const char *);
 480 char * input_scrub_next_buffer (char **bufp);
 481 size_t do_scrub_chars (size_t (*get) (char *, size_t), char *, size_t);
 482 int    gen_to_words (LITTLENUM_TYPE *, int, long);
 483 int    had_err (void);
 484 int    ignore_input (void);
 485 void   cond_finish_check (int);
 486 void   cond_exit_macro (int);
 487 int    seen_at_least_1_file (void);
 488 void   app_pop (char *);
 489 const char * as_where (unsigned int *);
 490 void   bump_line_counters (void);
 491 void   do_scrub_begin (int);
 492 void   input_scrub_begin (void);
 493 void   input_scrub_close (void);
 494 void   input_scrub_end (void);
 495 int    new_logical_line (const char *, int);
 496 int    new_logical_line_flags (const char *, int, int);
 497 void   subsegs_begin (void);
 498 void   subseg_change (segT, int);
 499 segT   subseg_new (const char *, subsegT);
 500 segT   subseg_force_new (const char *, subsegT);
 501 void   subseg_set (segT, subsegT);
 502 int    subseg_text_p (segT);
 503 int    seg_not_empty_p (segT);
 504 void   start_dependencies (char *);
 505 void   register_dependency (const char *);
 506 void   print_dependencies (void);
 507 segT   subseg_get (const char *, int);
 508
 509 const char *remap_debug_filename (const char *);
 510 void add_debug_prefix_map (const char *);
 511
 512 static inline char *
 513 xmemdup0 (const char *in, size_t len)
 514 {
 515   char *out = (char *) xmalloc (len + 1);
 516   out[len] = 0;
 517   return (char *) memcpy (out, in, len);
 518 }
 519
 520 struct expressionS;
 521 struct fix;
 522 typedef struct symbol symbolS;
 523 typedef struct frag fragS;
 524
 525 /* literal.c */
 526 valueT add_to_literal_pool (symbolS *, valueT, segT, int);
 527
 528 int check_eh_frame (struct expressionS *, unsigned int *);
 529 int eh_frame_estimate_size_before_relax (fragS *);
 530 int eh_frame_relax_frag (fragS *);
 531 void eh_frame_convert_frag (fragS *);
 532 int generic_force_reloc (struct fix *);
 533
 534 #include "expr.h"               /* Before targ-*.h */
 535
 536 /* This one starts the chain of target dependent headers.  */
 537 #include "targ-env.h"
 538
 539 #ifdef OBJ_MAYBE_ELF
 540 #define IS_ELF (OUTPUT_FLAVOR == bfd_target_elf_flavour)
 541 #else
 542 #ifdef OBJ_ELF
 543 #define IS_ELF 1
 544 #else
 545 #define IS_ELF 0
 546 #endif
 547 #endif
 548
 549 #include "write.h"
 550 #include "frags.h"
 551 #include "hash.h"
 552 #include "read.h"
 553 #include "symbols.h"
 554
 555 #include "tc.h"
 556 #include "obj.h"
 557
 558 #ifdef USE_EMULATIONS
 559 #include "emul.h"
 560 #endif
 561 #include "listing.h"
 562
 563 #ifdef H_TICK_HEX
 564 extern int enable_h_tick_hex;
 565 #endif
 566
 567 #ifdef TC_M68K
 568 /* True if we are assembling in m68k MRI mode.  */
 569 COMMON int flag_m68k_mri;
 570 #define DOLLAR_AMBIGU flag_m68k_mri
 571 #else
 572 #define flag_m68k_mri 0
 573 #endif
 574
 575 #ifdef WARN_COMMENTS
 576 COMMON int           warn_comment;
 577 COMMON unsigned int  found_comment;
 578 COMMON const char *        found_comment_file;
 579 #endif
 580
 581 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 582 /* If .size directive failure should be error or warning.  */
 583 COMMON int flag_allow_nonconst_size;
 584
 585 /* If we should generate ELF common symbols with the STT_COMMON type.  */
 586 extern int flag_use_elf_stt_common;
 587
 588 /* If section name substitution sequences should be honored */
 589 COMMON int flag_sectname_subst;
 590 #endif
 591
 592 #ifndef DOLLAR_AMBIGU
 593 #define DOLLAR_AMBIGU 0
 594 #endif
 595
 596 #ifndef NUMBERS_WITH_SUFFIX
 597 #define NUMBERS_WITH_SUFFIX 0
 598 #endif
 599
 600 #ifndef LOCAL_LABELS_DOLLAR
 601 #define LOCAL_LABELS_DOLLAR 0
 602 #endif
 603
 604 #ifndef LOCAL_LABELS_FB
 605 #define LOCAL_LABELS_FB 0
 606 #endif
 607
 608 #ifndef LABELS_WITHOUT_COLONS
 609 #define LABELS_WITHOUT_COLONS 0
 610 #endif
 611
 612 #ifndef NO_PSEUDO_DOT
 613 #define NO_PSEUDO_DOT 0
 614 #endif
 615
 616 #ifndef TEXT_SECTION_NAME
 617 #define TEXT_SECTION_NAME       ".text"
 618 #define DATA_SECTION_NAME       ".data"
 619 #define BSS_SECTION_NAME        ".bss"
 620 #endif
 621
 622 #ifndef OCTETS_PER_BYTE_POWER
 623 #define OCTETS_PER_BYTE_POWER 0
 624 #endif
 625 #ifndef OCTETS_PER_BYTE
 626 #define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
 627 #endif
 628 #if OCTETS_PER_BYTE != (1<<OCTETS_PER_BYTE_POWER)
 629  #error "Octets per byte conflicts with its power-of-two definition!"
 630 #endif
 631
 632 #endif /* GAS */