gas/as.h

   1 /* as.h - global header file
   2    Copyright 1987-2013 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  23 /* I think this stuff is largely out of date.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    190 gives the standard options room to grow.  */
  80 #define OPTION_MD_BASE 190
  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 /* This doesn't get taken care of anywhere.  */
 102 #ifndef __MWERKS__  /* Metrowerks C chokes on the "defined (inline)"  */
 103 #if !defined (__GNUC__) && !defined (inline)
 104 #define inline
 105 #endif
 106 #endif /* !__MWERKS__ */
 107
 108 /* Other stuff from config.h.  */
 109 #ifdef NEED_DECLARATION_ENVIRON
 110 extern char **environ;
 111 #endif
 112 #ifdef NEED_DECLARATION_ERRNO
 113 extern int errno;
 114 #endif
 115 #ifdef NEED_DECLARATION_FFS
 116 extern int ffs (int);
 117 #endif
 118 #ifdef NEED_DECLARATION_FREE
 119 extern void free ();
 120 #endif
 121 #ifdef NEED_DECLARATION_MALLOC
 122 extern void *malloc ();
 123 extern void *realloc ();
 124 #endif
 125 #ifdef NEED_DECLARATION_STRSTR
 126 extern char *strstr ();
 127 #endif
 128
 129 #if !HAVE_DECL_MEMPCPY
 130 void *mempcpy(void *, const void *, size_t);
 131 #endif
 132
 133 #if !HAVE_DECL_VSNPRINTF
 134 extern int vsnprintf(char *, size_t, const char *, va_list);
 135 #endif
 136
 137 /* This is needed for VMS.  */
 138 #if ! defined (HAVE_UNLINK) && defined (HAVE_REMOVE)
 139 #define unlink remove
 140 #endif
 141
 142 /* Hack to make "gcc -Wall" not complain about obstack macros.  */
 143 #if !defined (memcpy) && !defined (bcopy)
 144 #define bcopy(src,dest,size)    memcpy (dest, src, size)
 145 #endif
 146
 147 /* Make Saber happier on obstack.h.  */
 148 #ifdef SABER
 149 #undef  __PTR_TO_INT
 150 #define __PTR_TO_INT(P) ((int) (P))
 151 #undef  __INT_TO_PTR
 152 #define __INT_TO_PTR(P) ((char *) (P))
 153 #endif
 154
 155 #ifndef __LINE__
 156 #define __LINE__ "unknown"
 157 #endif /* __LINE__ */
 158
 159 #ifndef __FILE__
 160 #define __FILE__ "unknown"
 161 #endif /* __FILE__ */
 162
 163 #ifndef FOPEN_WB
 164 #ifdef USE_BINARY_FOPEN
 165 #include "fopen-bin.h"
 166 #else
 167 #include "fopen-same.h"
 168 #endif
 169 #endif
 170
 171 #ifndef EXIT_SUCCESS
 172 #define EXIT_SUCCESS 0
 173 #define EXIT_FAILURE 1
 174 #endif
 175
 176 #ifndef SEEK_SET
 177 #define SEEK_SET 0
 178 #endif
 179
 180 #define obstack_chunk_alloc xmalloc
 181 #define obstack_chunk_free xfree
 182
 183 #define xfree free
 184
 185 #include "asintl.h"
 186
 187 #define BAD_CASE(val)                                                       \
 188   {                                                                         \
 189     as_fatal (_("Case value %ld unexpected at line %d of file \"%s\"\n"),   \
 190               (long) val, __LINE__, __FILE__);                              \
 191   }
 192 \f
 193 #include "flonum.h"
 194
 195 /* These are assembler-wide concepts */
 196
 197 extern bfd *stdoutput;
 198 typedef bfd_vma addressT;
 199 typedef bfd_signed_vma offsetT;
 200
 201 /* Type of symbol value, etc.  For use in prototypes.  */
 202 typedef addressT valueT;
 203
 204 #ifndef COMMON
 205 #ifdef TEST
 206 #define COMMON                  /* Declare our COMMONs storage here.  */
 207 #else
 208 #define COMMON extern           /* Our commons live elsewhere.  */
 209 #endif
 210 #endif
 211 /* COMMON now defined */
 212
 213 #ifndef ENABLE_CHECKING
 214 #define ENABLE_CHECKING 0
 215 #endif
 216
 217 #if ENABLE_CHECKING || defined (DEBUG)
 218 #ifndef know
 219 #define know(p) gas_assert(p)   /* Verify our assumptions!  */
 220 #endif /* not yet defined */
 221 #else
 222 #define know(p) do {} while (0) /* know() checks are no-op.ed  */
 223 #endif
 224 \f
 225 /* input_scrub.c */
 226
 227 /* Supplies sanitised buffers to read.c.
 228    Also understands printing line-number part of error messages.  */
 229 \f
 230 /* subsegs.c     Sub-segments. Also, segment(=expression type)s.*/
 231
 232 typedef asection *segT;
 233 #define SEG_NORMAL(SEG)         (   (SEG) != absolute_section   \
 234                                  && (SEG) != undefined_section  \
 235                                  && (SEG) != reg_section        \
 236                                  && (SEG) != expr_section)
 237 typedef int subsegT;
 238
 239 /* What subseg we are accessing now?  */
 240 COMMON subsegT now_subseg;
 241
 242 /* Segment our instructions emit to.  */
 243 COMMON segT now_seg;
 244
 245 #define segment_name(SEG)       bfd_get_section_name (stdoutput, SEG)
 246
 247 extern segT reg_section, expr_section;
 248 /* Shouldn't these be eliminated someday?  */
 249 extern segT text_section, data_section, bss_section;
 250 #define absolute_section        bfd_abs_section_ptr
 251 #define undefined_section       bfd_und_section_ptr
 252
 253 enum _relax_state
 254 {
 255   /* Dummy frag used by listing code.  */
 256   rs_dummy = 0,
 257
 258   /* Variable chars to be repeated fr_offset times.
 259      Fr_symbol unused. Used with fr_offset == 0 for a
 260      constant length frag.  */
 261   rs_fill,
 262
 263   /* Align.  The fr_offset field holds the power of 2 to which to
 264      align.  The fr_var field holds the number of characters in the
 265      fill pattern.  The fr_subtype field holds the maximum number of
 266      bytes to skip when aligning, or 0 if there is no maximum.  */
 267   rs_align,
 268
 269   /* Align code.  The fr_offset field holds the power of 2 to which
 270      to align.  This type is only generated by machine specific
 271      code, which is normally responsible for handling the fill
 272      pattern.  The fr_subtype field holds the maximum number of
 273      bytes to skip when aligning, or 0 if there is no maximum.  */
 274   rs_align_code,
 275
 276   /* Test for alignment.  Like rs_align, but used by several targets
 277      to warn if data is not properly aligned.  */
 278   rs_align_test,
 279
 280   /* Org: Fr_offset, fr_symbol: address. 1 variable char: fill
 281      character.  */
 282   rs_org,
 283
 284 #ifndef WORKING_DOT_WORD
 285   /* JF: gunpoint */
 286   rs_broken_word,
 287 #endif
 288
 289   /* Machine specific relaxable (or similarly alterable) instruction.  */
 290   rs_machine_dependent,
 291
 292   /* .space directive with expression operand that needs to be computed
 293      later.  Similar to rs_org, but different.
 294      fr_symbol: operand
 295      1 variable char: fill character  */
 296   rs_space,
 297
 298   /* A DWARF leb128 value; only ELF uses this.  The subtype is 0 for
 299      unsigned, 1 for signed.  */
 300   rs_leb128,
 301
 302   /* Exception frame information which we may be able to optimize.  */
 303   rs_cfa,
 304
 305   /* Cross-fragment dwarf2 line number optimization.  */
 306   rs_dwarf2dbg
 307 };
 308
 309 typedef enum _relax_state relax_stateT;
 310
 311 /* This type is used in prototypes, so it can't be a type that will be
 312    widened for argument passing.  */
 313 typedef unsigned int relax_substateT;
 314
 315 /* Enough bits for address, but still an integer type.
 316    Could be a problem, cross-assembling for 64-bit machines.  */
 317 typedef addressT relax_addressT;
 318
 319 struct relax_type
 320 {
 321   /* Forward reach. Signed number. > 0.  */
 322   offsetT rlx_forward;
 323   /* Backward reach. Signed number. < 0.  */
 324   offsetT rlx_backward;
 325
 326   /* Bytes length of this address.  */
 327   unsigned char rlx_length;
 328
 329   /* Next longer relax-state.  0 means there is no 'next' relax-state.  */
 330   relax_substateT rlx_more;
 331 };
 332
 333 typedef struct relax_type relax_typeS;
 334 \f
 335 /* main program "as.c" (command arguments etc).  */
 336
 337 COMMON unsigned char flag_no_comments; /* -f */
 338 COMMON unsigned char flag_debug; /* -D */
 339 COMMON unsigned char flag_signed_overflow_ok; /* -J */
 340 #ifndef WORKING_DOT_WORD
 341 COMMON unsigned char flag_warn_displacement; /* -K */
 342 #endif
 343
 344 /* True if local symbols should be retained.  */
 345 COMMON int flag_keep_locals; /* -L */
 346
 347 /* True if we are assembling in MRI mode.  */
 348 COMMON int flag_mri;
 349
 350 /* Should the data section be made read-only and appended to the text
 351    section?  */
 352 COMMON unsigned char flag_readonly_data_in_text; /* -R */
 353
 354 /* True if warnings should be inhibited.  */
 355 COMMON int flag_no_warnings; /* -W */
 356
 357 /* True if warnings count as errors.  */
 358 COMMON int flag_fatal_warnings; /* --fatal-warnings */
 359
 360 /* True if we should attempt to generate output even if non-fatal errors
 361    are detected.  */
 362 COMMON unsigned char flag_always_generate_output; /* -Z */
 363
 364 /* This is true if the assembler should output time and space usage.  */
 365 COMMON unsigned char flag_print_statistics;
 366
 367 /* True if local absolute symbols are to be stripped.  */
 368 COMMON int flag_strip_local_absolute;
 369
 370 /* True if we should generate a traditional format object file.  */
 371 COMMON int flag_traditional_format;
 372
 373 /* TRUE if debug sections should be compressed.  */
 374 COMMON int flag_compress_debug;
 375
 376 /* TRUE if .note.GNU-stack section with SEC_CODE should be created */
 377 COMMON int flag_execstack;
 378
 379 /* TRUE if .note.GNU-stack section with SEC_CODE should be created */
 380 COMMON int flag_noexecstack;
 381
 382 /* name of emitted object file */
 383 COMMON char *out_file_name;
 384
 385 /* name of file defining extensions to the basic instruction set */
 386 COMMON char *insttbl_file_name;
 387
 388 /* TRUE if we need a second pass.  */
 389 COMMON int need_pass_2;
 390
 391 /* TRUE if we should do no relaxing, and
 392    leave lots of padding.  */
 393 COMMON int linkrelax;
 394
 395 /* TRUE if we should produce a listing.  */
 396 extern int listing;
 397
 398 /* Type of debugging information we should generate.  We currently support
 399    stabs, ECOFF, and DWARF2.
 400
 401    NOTE!  This means debug information about the assembly source code itself
 402    and _not_ about possible debug information from a high-level language.
 403    This is especially relevant to DWARF2, since the compiler may emit line
 404    number directives that the assembler resolves.  */
 405
 406 enum debug_info_type
 407 {
 408   DEBUG_UNSPECIFIED,
 409   DEBUG_NONE,
 410   DEBUG_STABS,
 411   DEBUG_ECOFF,
 412   DEBUG_DWARF,
 413   DEBUG_DWARF2
 414 };
 415
 416 extern enum debug_info_type debug_type;
 417 extern int use_gnu_debug_info_extensions;
 418 COMMON bfd_boolean flag_dwarf_sections;
 419 \f
 420 /* Maximum level of macro nesting.  */
 421 extern int max_macro_nest;
 422
 423 /* Verbosity level.  */
 424 extern int verbose;
 425
 426 /* Obstack chunk size.  Keep large for efficient space use, make small to
 427    increase malloc calls for monitoring memory allocation.  */
 428 extern int chunksize;
 429
 430 struct _pseudo_type
 431 {
 432   /* assembler mnemonic, lower case, no '.' */
 433   const char *poc_name;
 434   /* Do the work */
 435   void (*poc_handler) (int);
 436   /* Value to pass to handler */
 437   int poc_val;
 438 };
 439
 440 typedef struct _pseudo_type pseudo_typeS;
 441
 442 #if (__GNUC__ >= 2) && !defined(VMS)
 443 /* for use with -Wformat */
 444
 445 #if __GNUC__ == 2 && __GNUC_MINOR__ < 6
 446 /* Support for double underscores in attribute names was added in gcc
 447    2.6, so avoid them if we are using an earlier version.  */
 448 #define __printf__ printf
 449 #define __format__ format
 450 #endif
 451
 452 #define PRINTF_LIKE(FCN) \
 453   void FCN (const char *format, ...) \
 454     __attribute__ ((__format__ (__printf__, 1, 2)))
 455 #define PRINTF_WHERE_LIKE(FCN) \
 456   void FCN (char *file, unsigned int line, const char *format, ...) \
 457     __attribute__ ((__format__ (__printf__, 3, 4)))
 458
 459 #else /* __GNUC__ < 2 || defined(VMS) */
 460
 461 #define PRINTF_LIKE(FCN)        void FCN (const char *format, ...)
 462 #define PRINTF_WHERE_LIKE(FCN)  void FCN (char *file, \
 463                                           unsigned int line, \
 464                                           const char *format, ...)
 465
 466 #endif /* __GNUC__ < 2 || defined(VMS) */
 467
 468 PRINTF_LIKE (as_bad);
 469 PRINTF_LIKE (as_fatal) ATTRIBUTE_NORETURN;
 470 PRINTF_LIKE (as_tsktsk);
 471 PRINTF_LIKE (as_warn);
 472 PRINTF_WHERE_LIKE (as_bad_where);
 473 PRINTF_WHERE_LIKE (as_warn_where);
 474
 475 void   as_assert (const char *, int, const char *);
 476 void   as_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 477 void   sprint_value (char *, addressT);
 478 int    had_errors (void);
 479 int    had_warnings (void);
 480 void   as_warn_value_out_of_range (char *, offsetT, offsetT, offsetT, char *, unsigned);
 481 void   as_bad_value_out_of_range (char *, offsetT, offsetT, offsetT, char *, unsigned);
 482 void   print_version_id (void);
 483 char * app_push (void);
 484 char * atof_ieee (char *, int, LITTLENUM_TYPE *);
 485 char * ieee_md_atof (int, char *, int *, bfd_boolean);
 486 char * vax_md_atof (int, char *, int *);
 487 char * input_scrub_include_file (char *, char *);
 488 void   input_scrub_insert_line (const char *);
 489 void   input_scrub_insert_file (char *);
 490 char * input_scrub_new_file (char *);
 491 char * input_scrub_next_buffer (char **bufp);
 492 size_t do_scrub_chars (size_t (*get) (char *, size_t), char *, size_t);
 493 int    gen_to_words (LITTLENUM_TYPE *, int, long);
 494 int    had_err (void);
 495 int    ignore_input (void);
 496 void   cond_finish_check (int);
 497 void   cond_exit_macro (int);
 498 int    seen_at_least_1_file (void);
 499 void   app_pop (char *);
 500 void   as_where (char **, unsigned int *);
 501 void   bump_line_counters (void);
 502 void   do_scrub_begin (int);
 503 void   input_scrub_begin (void);
 504 void   input_scrub_close (void);
 505 void   input_scrub_end (void);
 506 int    new_logical_line (char *, int);
 507 int    new_logical_line_flags (char *, int, int);
 508 void   subsegs_begin (void);
 509 void   subseg_change (segT, int);
 510 segT   subseg_new (const char *, subsegT);
 511 segT   subseg_force_new (const char *, subsegT);
 512 void   subseg_set (segT, subsegT);
 513 int    subseg_text_p (segT);
 514 int    seg_not_empty_p (segT);
 515 void   start_dependencies (char *);
 516 void   register_dependency (char *);
 517 void   print_dependencies (void);
 518 segT   subseg_get (const char *, int);
 519
 520 const char *remap_debug_filename (const char *);
 521 void add_debug_prefix_map (const char *);
 522
 523 struct expressionS;
 524 struct fix;
 525 typedef struct symbol symbolS;
 526 typedef struct frag fragS;
 527
 528 /* literal.c */
 529 valueT add_to_literal_pool (symbolS *, valueT, segT, int);
 530
 531 int check_eh_frame (struct expressionS *, unsigned int *);
 532 int eh_frame_estimate_size_before_relax (fragS *);
 533 int eh_frame_relax_frag (fragS *);
 534 void eh_frame_convert_frag (fragS *);
 535 int generic_force_reloc (struct fix *);
 536
 537 #include "expr.h"               /* Before targ-*.h */
 538
 539 /* This one starts the chain of target dependant headers.  */
 540 #include "targ-env.h"
 541
 542 #ifdef OBJ_MAYBE_ELF
 543 #define IS_ELF (OUTPUT_FLAVOR == bfd_target_elf_flavour)
 544 #else
 545 #ifdef OBJ_ELF
 546 #define IS_ELF 1
 547 #else
 548 #define IS_ELF 0
 549 #endif
 550 #endif
 551
 552 #include "write.h"
 553 #include "frags.h"
 554 #include "hash.h"
 555 #include "read.h"
 556 #include "symbols.h"
 557
 558 #include "tc.h"
 559 #include "obj.h"
 560
 561 #ifdef USE_EMULATIONS
 562 #include "emul.h"
 563 #endif
 564 #include "listing.h"
 565
 566 #ifdef H_TICK_HEX
 567 extern int enable_h_tick_hex;
 568 #endif
 569
 570 #ifdef TC_M68K
 571 /* True if we are assembling in m68k MRI mode.  */
 572 COMMON int flag_m68k_mri;
 573 #define DOLLAR_AMBIGU flag_m68k_mri
 574 #else
 575 #define flag_m68k_mri 0
 576 #endif
 577
 578 #ifdef WARN_COMMENTS
 579 COMMON int           warn_comment;
 580 COMMON unsigned int  found_comment;
 581 COMMON char *        found_comment_file;
 582 #endif
 583
 584 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 585 /* If .size directive failure should be error or warning.  */
 586 COMMON enum
 587   {
 588     size_check_error = 0,
 589     size_check_warning
 590   }
 591 flag_size_check;
 592 #endif
 593
 594 #ifndef DOLLAR_AMBIGU
 595 #define DOLLAR_AMBIGU 0
 596 #endif
 597
 598 #ifndef NUMBERS_WITH_SUFFIX
 599 #define NUMBERS_WITH_SUFFIX 0
 600 #endif
 601
 602 #ifndef LOCAL_LABELS_DOLLAR
 603 #define LOCAL_LABELS_DOLLAR 0
 604 #endif
 605
 606 #ifndef LOCAL_LABELS_FB
 607 #define LOCAL_LABELS_FB 0
 608 #endif
 609
 610 #ifndef LABELS_WITHOUT_COLONS
 611 #define LABELS_WITHOUT_COLONS 0
 612 #endif
 613
 614 #ifndef NO_PSEUDO_DOT
 615 #define NO_PSEUDO_DOT 0
 616 #endif
 617
 618 #ifndef TEXT_SECTION_NAME
 619 #define TEXT_SECTION_NAME       ".text"
 620 #define DATA_SECTION_NAME       ".data"
 621 #define BSS_SECTION_NAME        ".bss"
 622 #endif
 623
 624 #ifndef OCTETS_PER_BYTE_POWER
 625 #define OCTETS_PER_BYTE_POWER 0
 626 #endif
 627 #ifndef OCTETS_PER_BYTE
 628 #define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
 629 #endif
 630 #if OCTETS_PER_BYTE != (1<<OCTETS_PER_BYTE_POWER)
 631  #error "Octets per byte conflicts with its power-of-two definition!"
 632 #endif
 633
 634 #endif /* GAS */