1 /* read.c - read a source file -
2 Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* If your chars aren't 8 bits, you will change this a bit.
24 But then, GNU isn't spozed to run on your machine anyway.
25 (RMS is so shortsighted sometimes.) */
26 #define MASK_CHAR (0xFF)
28 #define MASK_CHAR ((int)(unsigned char) -1)
31 /* This is the largest known floating point format (for now). It will
32 grow when we do 4361 style flonums. */
33 #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
35 /* Routines that read assembler source text to build spaghetti in memory.
36 Another group of these functions is in the expr.c module. */
39 #include "safe-ctype.h"
46 #include "dw2gencfi.h"
48 #ifndef TC_START_LABEL
49 #define TC_START_LABEL(x,y) (x == ':')
52 /* Set by the object-format or the target. */
53 #ifndef TC_IMPLICIT_LCOMM_ALIGNMENT
54 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) \
59 else if ((SIZE) >= 4) \
61 else if ((SIZE) >= 2) \
69 char *input_line_pointer; /*->next char of source file to parse. */
71 #if BITS_PER_CHAR != 8
72 /* The following table is indexed by[(char)] and will break if
73 a char does not have exactly 256 states (hopefully 0:255!)! */
78 /* The m88k unfortunately uses @ as a label beginner. */
83 /* The RS/6000 assembler uses {,},[,] as parts of symbol names. */
88 /* The Delta 68k assembler permits % inside label names. */
93 /* The PowerPC Windows NT assemblers permits ? inside label names. */
98 /* The IA-64 assembler uses # as a suffix designating a symbol. We include
99 it in the symbol and strip it out in tc_canonicalize_symbol_name. */
104 /* The a29k assembler does not permits labels to start with $. */
109 /* The Delta 68k assembler permits ~ at start of label names. */
113 /* Used by is_... macros. our ctype[]. */
114 char lex_type[256] = {
115 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
116 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
117 0, 0, 0, LEX_HASH, LEX_DOLLAR, LEX_PCT, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
118 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, LEX_QM, /* 0123456789:;<=>? */
119 LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
120 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, 0, 3, /* PQRSTUVWXYZ[\]^_ */
121 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
122 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, LEX_TILDE, 0, /* pqrstuvwxyz{|}~. */
123 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
124 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
125 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
126 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
127 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
128 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
129 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
130 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
134 Out: 1 if this character ends a line. */
135 char is_end_of_line[256] = {
137 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, /* @abcdefghijklmno */
139 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, /* @abcdefghijklmno */
141 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
142 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* _!"#$%&'()*+,-./ */
143 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
144 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
145 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
146 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
147 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
148 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
149 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
150 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
151 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
152 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
153 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
154 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
155 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 /* */
158 #ifndef TC_CASE_SENSITIVE
159 char original_case_string[128];
162 /* Functions private to this file. */
164 static char *buffer; /* 1st char of each buffer of lines is here. */
165 static char *buffer_limit; /*->1 + last char in buffer. */
167 /* TARGET_BYTES_BIG_ENDIAN is required to be defined to either 0 or 1
168 in the tc-<CPU>.h file. See the "Porting GAS" section of the
170 int target_big_endian = TARGET_BYTES_BIG_ENDIAN;
172 /* Variables for handling include file directory table. */
174 /* Table of pointers to directories to search for .include's. */
177 /* How many are in the table. */
178 int include_dir_count;
180 /* Length of longest in table. */
181 int include_dir_maxlen = 1;
183 #ifndef WORKING_DOT_WORD
184 struct broken_word *broken_words;
185 int new_broken_words;
188 /* The current offset into the absolute section. We don't try to
189 build frags in the absolute section, since no data can be stored
190 there. We just keep track of the current offset. */
191 addressT abs_section_offset;
193 /* If this line had an MRI style label, it is stored in this variable.
194 This is used by some of the MRI pseudo-ops. */
197 /* This global variable is used to support MRI common sections. We
198 translate such sections into a common symbol. This variable is
199 non-NULL when we are in an MRI common section. */
200 symbolS *mri_common_symbol;
202 /* In MRI mode, after a dc.b pseudo-op with an odd number of bytes, we
203 need to align to an even byte boundary unless the next pseudo-op is
204 dc.b, ds.b, or dcb.b. This variable is set to 1 if an alignment
206 static int mri_pending_align;
210 /* This variable is set to be non-zero if the next string we see might
211 be the name of the source file in DWARF debugging information. See
212 the comment in emit_expr for the format we look for. */
213 static int dwarf_file_string;
217 static void do_align (int, char *, int, int);
218 static void s_align (int, int);
219 static void s_altmacro (int);
220 static int hex_float (int, char *);
221 static segT get_known_segmented_expression (expressionS * expP);
222 static void pobegin (void);
223 static int get_line_sb (sb *);
224 static void generate_file_debug (void);
232 obj_read_begin_hook ();
234 /* Something close -- but not too close -- to a multiple of 1024.
235 The debugging malloc I'm using has 24 bytes of overhead. */
236 obstack_begin (¬es, chunksize);
237 obstack_begin (&cond_obstack, chunksize);
239 /* Use machine dependent syntax. */
240 for (p = line_separator_chars; *p; p++)
241 is_end_of_line[(unsigned char) *p] = 1;
242 /* Use more. FIXME-SOMEDAY. */
248 /* Set up pseudo-op tables. */
250 static struct hash_control *po_hash;
252 static const pseudo_typeS potable[] = {
253 {"abort", s_abort, 0},
254 {"align", s_align_ptwo, 0},
255 {"altmacro", s_altmacro, 1},
256 {"ascii", stringer, 0},
257 {"asciz", stringer, 1},
258 {"balign", s_align_bytes, 0},
259 {"balignw", s_align_bytes, -2},
260 {"balignl", s_align_bytes, -4},
264 {"common", s_mri_common, 0},
265 {"common.s", s_mri_common, 1},
269 {"dc.d", float_cons, 'd'},
271 {"dc.s", float_cons, 'f'},
273 {"dc.x", float_cons, 'x'},
275 {"dcb.b", s_space, 1},
276 {"dcb.d", s_float_space, 'd'},
277 {"dcb.l", s_space, 4},
278 {"dcb.s", s_float_space, 'f'},
279 {"dcb.w", s_space, 2},
280 {"dcb.x", s_float_space, 'x'},
282 {"ds.b", s_space, 1},
283 {"ds.d", s_space, 8},
284 {"ds.l", s_space, 4},
285 {"ds.p", s_space, 12},
286 {"ds.s", s_space, 4},
287 {"ds.w", s_space, 2},
288 {"ds.x", s_space, 12},
289 {"debug", s_ignore, 0},
294 {"double", float_cons, 'd'},
296 {"eject", listing_eject, 0}, /* Formfeed listing. */
298 {"elsec", s_else, 0},
299 {"elseif", s_elseif, (int) O_ne},
301 {"endc", s_endif, 0},
302 {"endfunc", s_func, 1},
303 {"endif", s_endif, 0},
304 {"endr", s_bad_endr, 0},
309 {"error", s_errwarn, 1},
310 {"exitm", s_mexit, 0},
312 {"extern", s_ignore, 0}, /* We treat all undef as ext. */
313 {"appfile", s_app_file, 1},
314 {"appline", s_app_line, 0},
316 {"file", s_app_file, 0},
318 {"float", float_cons, 'f'},
319 {"format", s_ignore, 0},
321 {"global", s_globl, 0},
322 {"globl", s_globl, 0},
324 {"if", s_if, (int) O_ne},
326 {"ifdef", s_ifdef, 0},
327 {"ifeq", s_if, (int) O_eq},
328 {"ifeqs", s_ifeqs, 0},
329 {"ifge", s_if, (int) O_ge},
330 {"ifgt", s_if, (int) O_gt},
331 {"ifle", s_if, (int) O_le},
332 {"iflt", s_if, (int) O_lt},
334 {"ifndef", s_ifdef, 1},
335 {"ifne", s_if, (int) O_ne},
336 {"ifnes", s_ifeqs, 1},
337 {"ifnotdef", s_ifdef, 1},
338 {"incbin", s_incbin, 0},
339 {"include", s_include, 0},
345 {"lcomm", s_lcomm, 0},
346 {"lflags", listing_flags, 0}, /* Listing flags. */
347 {"linkonce", s_linkonce, 0},
348 {"list", listing_list, 1}, /* Turn listing on. */
349 {"llen", listing_psize, 1},
352 {"macro", s_macro, 0},
353 {"mexit", s_mexit, 0},
355 {".mri", s_mri, 0}, /* Special case so .mri works in MRI mode. */
356 {"name", s_ignore, 0},
357 {"noaltmacro", s_altmacro, 0},
358 {"noformat", s_ignore, 0},
359 {"nolist", listing_list, 0}, /* Turn listing off. */
360 {"nopage", listing_nopage, 0},
362 {"offset", s_struct, 0},
364 {"p2align", s_align_ptwo, 0},
365 {"p2alignw", s_align_ptwo, -2},
366 {"p2alignl", s_align_ptwo, -4},
367 {"page", listing_eject, 0},
368 {"plen", listing_psize, 0},
369 {"print", s_print, 0},
370 {"psize", listing_psize, 0}, /* Set paper size. */
371 {"purgem", s_purgem, 0},
376 {"sbttl", listing_title, 1}, /* Subtitle of listing. */
381 {"single", float_cons, 'f'},
383 {"space", s_space, 0},
384 {"skip", s_space, 0},
385 {"sleb128", s_leb128, 1},
386 {"spc", s_ignore, 0},
387 {"stabd", s_stab, 'd'},
388 {"stabn", s_stab, 'n'},
389 {"stabs", s_stab, 's'},
390 {"string", stringer, 1},
391 {"struct", s_struct, 0},
395 /* This is for gcc to use. It's only just been added (2/94), so gcc
396 won't be able to use it for a while -- probably a year or more.
397 But once this has been released, check with gcc maintainers
398 before deleting it or even changing the spelling. */
399 {"this_GCC_requires_the_GNU_assembler", s_ignore, 0},
400 /* If we're folding case -- done for some targets, not necessarily
401 all -- the above string in an input file will be converted to
402 this one. Match it either way... */
403 {"this_gcc_requires_the_gnu_assembler", s_ignore, 0},
405 {"title", listing_title, 0}, /* Listing title. */
406 {"ttl", listing_title, 0},
408 {"uleb128", s_leb128, 0},
412 {"xdef", s_globl, 0},
413 {"xref", s_ignore, 0},
414 {"xstabs", s_xstab, 's'},
415 {"warning", s_errwarn, 0},
417 {"zero", s_space, 0},
418 {NULL, NULL, 0} /* End sentinel. */
421 static int pop_override_ok = 0;
422 static const char *pop_table_name;
425 pop_insert (const pseudo_typeS *table)
428 const pseudo_typeS *pop;
429 for (pop = table; pop->poc_name; pop++)
431 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
432 if (errtxt && (!pop_override_ok || strcmp (errtxt, "exists")))
433 as_fatal (_("error constructing %s pseudo-op table: %s"), pop_table_name,
438 #ifndef md_pop_insert
439 #define md_pop_insert() pop_insert(md_pseudo_table)
442 #ifndef obj_pop_insert
443 #define obj_pop_insert() pop_insert(obj_pseudo_table)
446 #ifndef cfi_pop_insert
447 #define cfi_pop_insert() pop_insert(cfi_pseudo_table)
453 po_hash = hash_new ();
455 /* Do the target-specific pseudo ops. */
456 pop_table_name = "md";
459 /* Now object specific. Skip any that were in the target table. */
460 pop_table_name = "obj";
464 /* Now portable ones. Skip any that we've seen already. */
465 pop_table_name = "standard";
466 pop_insert (potable);
468 #ifdef TARGET_USE_CFIPOP
469 pop_table_name = "cfi";
475 #define HANDLE_CONDITIONAL_ASSEMBLY() \
476 if (ignore_input ()) \
478 while (!is_end_of_line[(unsigned char) *input_line_pointer++]) \
479 if (input_line_pointer == buffer_limit) \
484 /* This function is used when scrubbing the characters between #APP
487 static char *scrub_string;
488 static char *scrub_string_end;
491 scrub_from_string (char *buf, int buflen)
495 copy = scrub_string_end - scrub_string;
498 memcpy (buf, scrub_string, copy);
499 scrub_string += copy;
503 /* We read the file, putting things into a web that represents what we
504 have been reading. */
506 read_a_source_file (char *name)
509 register char *s; /* String of symbol, '\0' appended. */
517 buffer = input_scrub_new_file (name);
520 listing_newline (NULL);
521 register_dependency (name);
523 /* Generate debugging information before we've read anything in to denote
524 this file as the "main" source file and not a subordinate one
525 (e.g. N_SO vs N_SOL in stabs). */
526 generate_file_debug ();
528 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
529 { /* We have another line to parse. */
530 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
532 while (input_line_pointer < buffer_limit)
534 /* We have more of this buffer to parse. */
536 /* We now have input_line_pointer->1st char of next line.
537 If input_line_pointer [-1] == '\n' then we just
538 scanned another line: so bump line counters. */
539 if (is_end_of_line[(unsigned char) input_line_pointer[-1]])
541 #ifdef md_start_line_hook
542 md_start_line_hook ();
544 if (input_line_pointer[-1] == '\n')
545 bump_line_counters ();
549 if (LABELS_WITHOUT_COLONS || flag_m68k_mri)
551 /* Text at the start of a line must be a label, we
552 run down and stick a colon in. */
553 if (is_name_beginner (*input_line_pointer))
555 char *line_start = input_line_pointer;
560 HANDLE_CONDITIONAL_ASSEMBLY ();
562 c = get_symbol_end ();
564 /* In MRI mode, the EQU and MACRO pseudoops must
565 be handled specially. */
569 char *rest = input_line_pointer + 1;
573 if (*rest == ' ' || *rest == '\t')
575 if ((strncasecmp (rest, "EQU", 3) == 0
576 || strncasecmp (rest, "SET", 3) == 0)
577 && (rest[3] == ' ' || rest[3] == '\t'))
579 input_line_pointer = rest + 3;
581 strncasecmp (rest, "SET", 3) == 0);
584 if (strncasecmp (rest, "MACRO", 5) == 0
587 || is_end_of_line[(unsigned char) rest[5]]))
591 /* In MRI mode, we need to handle the MACRO
592 pseudo-op specially: we don't want to put the
593 symbol in the symbol table. */
595 #ifdef TC_START_LABEL_WITHOUT_COLON
596 && TC_START_LABEL_WITHOUT_COLON(c,
600 line_label = colon (line_start);
602 line_label = symbol_create (line_start,
607 *input_line_pointer = c;
609 input_line_pointer++;
614 /* We are at the beginning of a line, or similar place.
615 We expect a well-formed assembler statement.
616 A "symbol-name:" is a statement.
618 Depending on what compiler is used, the order of these tests
619 may vary to catch most common case 1st.
620 Each test is independent of all other tests at the (top) level.
621 PLEASE make a compiler that doesn't use this assembler.
622 It is crufty to waste a compiler's time encoding things for this
623 assembler, which then wastes more time decoding it.
624 (And communicating via (linear) files is silly!
625 If you must pass stuff, please pass a tree!) */
626 if ((c = *input_line_pointer++) == '\t'
630 c = *input_line_pointer++;
632 know (c != ' '); /* No further leading whitespace. */
635 /* If listing is on, and we are expanding a macro, then give
636 the listing code the contents of the expanded line. */
639 if ((listing & LISTING_MACEXP) && macro_nest > 0)
644 /* Find the end of the current expanded macro line. */
645 for (s = input_line_pointer - 1; *s; ++s)
646 if (is_end_of_line[(unsigned char) *s])
649 /* Copy it for safe keeping. Also give an indication of
650 how much macro nesting is involved at this point. */
651 len = s - (input_line_pointer - 1);
652 copy = (char *) xmalloc (len + macro_nest + 2);
653 memset (copy, '>', macro_nest);
654 copy[macro_nest] = ' ';
655 memcpy (copy + macro_nest + 1, input_line_pointer - 1, len);
656 copy[macro_nest + 1 + len] = '\0';
658 /* Install the line with the listing facility. */
659 listing_newline (copy);
662 listing_newline (NULL);
665 /* C is the 1st significant character.
666 Input_line_pointer points after that character. */
667 if (is_name_beginner (c))
669 /* Want user-defined label or pseudo/opcode. */
670 HANDLE_CONDITIONAL_ASSEMBLY ();
672 s = --input_line_pointer;
673 c = get_symbol_end (); /* name's delimiter. */
675 /* C is character after symbol.
676 That character's place in the input line is now '\0'.
677 S points to the beginning of the symbol.
678 [In case of pseudo-op, s->'.'.]
679 Input_line_pointer->'\0' where c was. */
680 if (TC_START_LABEL (c, input_line_pointer))
684 char *rest = input_line_pointer + 1;
686 /* In MRI mode, \tsym: set 0 is permitted. */
690 if (*rest == ' ' || *rest == '\t')
693 if ((strncasecmp (rest, "EQU", 3) == 0
694 || strncasecmp (rest, "SET", 3) == 0)
695 && (rest[3] == ' ' || rest[3] == '\t'))
697 input_line_pointer = rest + 3;
703 line_label = colon (s); /* User-defined label. */
704 /* Put ':' back for error messages' sake. */
705 *input_line_pointer++ = ':';
706 #ifdef tc_check_label
707 tc_check_label (line_label);
709 /* Input_line_pointer->after ':'. */
713 || ((c == ' ' || c == '\t')
714 && input_line_pointer[1] == '='
715 #ifdef TC_EQUAL_IN_INSN
716 && !TC_EQUAL_IN_INSN (c, input_line_pointer)
721 demand_empty_rest_of_line ();
725 /* Expect pseudo-op or machine instruction. */
728 #ifndef TC_CASE_SENSITIVE
732 strncpy (original_case_string, s2, sizeof (original_case_string));
733 original_case_string[sizeof (original_case_string) - 1] = 0;
742 if (NO_PSEUDO_DOT || flag_m68k_mri)
744 /* The MRI assembler and the m88k use pseudo-ops
746 pop = (pseudo_typeS *) hash_find (po_hash, s);
747 if (pop != NULL && pop->poc_handler == NULL)
752 || (!flag_m68k_mri && *s == '.'))
756 WARNING: c has next char, which may be end-of-line.
757 We lookup the pseudo-op table with s+1 because we
758 already know that the pseudo-op begins with a '.'. */
761 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
762 if (pop && !pop->poc_handler)
765 /* In MRI mode, we may need to insert an
766 automatic alignment directive. What a hack
768 if (mri_pending_align
770 || !((pop->poc_handler == cons
771 && pop->poc_val == 1)
772 || (pop->poc_handler == s_space
773 && pop->poc_val == 1)
774 #ifdef tc_conditional_pseudoop
775 || tc_conditional_pseudoop (pop)
777 || pop->poc_handler == s_if
778 || pop->poc_handler == s_ifdef
779 || pop->poc_handler == s_ifc
780 || pop->poc_handler == s_ifeqs
781 || pop->poc_handler == s_else
782 || pop->poc_handler == s_endif
783 || pop->poc_handler == s_globl
784 || pop->poc_handler == s_ignore)))
786 do_align (1, (char *) NULL, 0, 0);
787 mri_pending_align = 0;
789 if (line_label != NULL)
791 symbol_set_frag (line_label, frag_now);
792 S_SET_VALUE (line_label, frag_now_fix ());
796 /* Print the error msg now, while we still can. */
799 as_bad (_("unknown pseudo-op: `%s'"), s);
800 *input_line_pointer = c;
805 /* Put it back for error messages etc. */
806 *input_line_pointer = c;
807 /* The following skip of whitespace is compulsory.
808 A well shaped space is sometimes all that separates
809 keyword from operands. */
810 if (c == ' ' || c == '\t')
811 input_line_pointer++;
813 /* Input_line is restored.
814 Input_line_pointer->1st non-blank char
815 after pseudo-operation. */
816 (*pop->poc_handler) (pop->poc_val);
818 /* If that was .end, just get out now. */
819 if (pop->poc_handler == s_end)
825 #ifdef QUOTES_IN_INSN
829 /* WARNING: c has char, which may be end-of-line. */
830 /* Also: input_line_pointer->`\0` where c was. */
831 *input_line_pointer = c;
832 while (!is_end_of_line[(unsigned char) *input_line_pointer]
834 #ifdef TC_EOL_IN_INSN
835 || TC_EOL_IN_INSN (input_line_pointer)
839 if (flag_m68k_mri && *input_line_pointer == '\'')
841 #ifdef QUOTES_IN_INSN
844 else if (*input_line_pointer == '"')
846 else if (*input_line_pointer == '\\')
849 input_line_pointer++;
852 c = *input_line_pointer;
853 *input_line_pointer = '\0';
855 generate_lineno_debug ();
863 if (check_macro (s, &out, &err, ¯o))
867 *input_line_pointer++ = c;
868 input_scrub_include_sb (&out,
869 input_line_pointer, 1);
872 input_scrub_next_buffer (&input_line_pointer);
874 md_macro_info (macro);
880 if (mri_pending_align)
882 do_align (1, (char *) NULL, 0, 0);
883 mri_pending_align = 0;
884 if (line_label != NULL)
886 symbol_set_frag (line_label, frag_now);
887 S_SET_VALUE (line_label, frag_now_fix ());
891 md_assemble (s); /* Assemble 1 instruction. */
893 *input_line_pointer++ = c;
895 /* We resume loop AFTER the end-of-line from
902 /* Empty statement? */
903 if (is_end_of_line[(unsigned char) c])
906 if ((LOCAL_LABELS_DOLLAR || LOCAL_LABELS_FB) && ISDIGIT (c))
908 /* local label ("4:") */
909 char *backup = input_line_pointer;
911 HANDLE_CONDITIONAL_ASSEMBLY ();
915 /* Read the whole number. */
916 while (ISDIGIT (*input_line_pointer))
918 temp = (temp * 10) + *input_line_pointer - '0';
919 ++input_line_pointer;
922 if (LOCAL_LABELS_DOLLAR
923 && *input_line_pointer == '$'
924 && *(input_line_pointer + 1) == ':')
926 input_line_pointer += 2;
928 if (dollar_label_defined (temp))
930 as_fatal (_("label \"%d$\" redefined"), temp);
933 define_dollar_label (temp);
934 colon (dollar_label_name (temp, 0));
939 && *input_line_pointer++ == ':')
941 fb_label_instance_inc (temp);
942 colon (fb_label_name (temp, 0));
946 input_line_pointer = backup;
947 } /* local label ("4:") */
949 if (c && strchr (line_comment_chars, c))
950 { /* Its a comment. Better say APP or NO_APP. */
955 unsigned int new_length;
958 bump_line_counters ();
959 s = input_line_pointer;
960 if (strncmp (s, "APP\n", 4))
961 continue; /* We ignore it */
965 ends = strstr (s, "#NO_APP\n");
969 unsigned int tmp_len;
972 /* The end of the #APP wasn't in this buffer. We
973 keep reading in buffers until we find the #NO_APP
974 that goes with this #APP There is one. The specs
976 tmp_len = buffer_limit - s;
977 tmp_buf = xmalloc (tmp_len + 1);
978 memcpy (tmp_buf, s, tmp_len);
981 new_tmp = input_scrub_next_buffer (&buffer);
985 buffer_limit = new_tmp;
986 input_line_pointer = buffer;
987 ends = strstr (buffer, "#NO_APP\n");
991 num = buffer_limit - buffer;
993 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
994 memcpy (tmp_buf + tmp_len, buffer, num);
999 input_line_pointer = ends ? ends + 8 : NULL;
1007 input_line_pointer = ends + 8;
1011 scrub_string_end = ends;
1013 new_length = ends - s;
1014 new_buf = (char *) xmalloc (new_length);
1021 space = (new_buf + new_length) - new_tmp;
1022 size = do_scrub_chars (scrub_from_string, new_tmp, space);
1030 new_buf = xrealloc (new_buf, new_length + 100);
1031 new_tmp = new_buf + new_length;
1038 /* We've "scrubbed" input to the preferred format. In the
1039 process we may have consumed the whole of the remaining
1040 file (and included files). We handle this formatted
1041 input similar to that of macro expansion, letting
1042 actual macro expansion (possibly nested) and other
1043 input expansion work. Beware that in messages, line
1044 numbers and possibly file names will be incorrect. */
1045 sb_add_string (&sbuf, new_buf);
1046 input_scrub_include_sb (&sbuf, input_line_pointer, 0);
1048 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
1053 HANDLE_CONDITIONAL_ASSEMBLY ();
1055 #ifdef tc_unrecognized_line
1056 if (tc_unrecognized_line (c))
1059 input_line_pointer--;
1060 /* Report unknown char as ignored. */
1061 demand_empty_rest_of_line ();
1064 #ifdef md_after_pass_hook
1065 md_after_pass_hook ();
1074 /* Close the input file. */
1075 input_scrub_close ();
1076 #ifdef WARN_COMMENTS
1078 if (warn_comment && found_comment)
1079 as_warn_where (found_comment_file, found_comment,
1080 "first comment found here");
1085 /* For most MRI pseudo-ops, the line actually ends at the first
1086 nonquoted space. This function looks for that point, stuffs a null
1087 in, and sets *STOPCP to the character that used to be there, and
1088 returns the location.
1090 Until I hear otherwise, I am going to assume that this is only true
1091 for the m68k MRI assembler. */
1094 mri_comment_field (char *stopcp)
1100 know (flag_m68k_mri);
1102 for (s = input_line_pointer;
1103 ((!is_end_of_line[(unsigned char) *s] && *s != ' ' && *s != '\t')
1111 for (s = input_line_pointer;
1112 !is_end_of_line[(unsigned char) *s];
1122 /* Skip to the end of an MRI comment field. */
1125 mri_comment_end (char *stop, int stopc)
1129 input_line_pointer = stop;
1131 while (!is_end_of_line[(unsigned char) *input_line_pointer])
1132 ++input_line_pointer;
1136 s_abort (int ignore ATTRIBUTE_UNUSED)
1138 as_fatal (_(".abort detected. Abandoning ship."));
1141 /* Guts of .align directive. N is the power of two to which to align.
1142 FILL may be NULL, or it may point to the bytes of the fill pattern.
1143 LEN is the length of whatever FILL points to, if anything. MAX is
1144 the maximum number of characters to skip when doing the alignment,
1145 or 0 if there is no maximum. */
1148 do_align (int n, char *fill, int len, int max)
1150 if (now_seg == absolute_section)
1154 if (*fill++ != '\0')
1156 as_warn (_("ignoring fill value in absolute section"));
1163 #ifdef md_flush_pending_output
1164 md_flush_pending_output ();
1167 md_do_align (n, fill, len, max, just_record_alignment);
1170 /* Only make a frag if we HAVE to... */
1171 if (n != 0 && !need_pass_2)
1175 if (subseg_text_p (now_seg))
1176 frag_align_code (n, max);
1178 frag_align (n, 0, max);
1181 frag_align (n, *fill, max);
1183 frag_align_pattern (n, fill, len, max);
1187 just_record_alignment: ATTRIBUTE_UNUSED_LABEL
1190 record_alignment (now_seg, n - OCTETS_PER_BYTE_POWER);
1193 /* Handle the .align pseudo-op. A positive ARG is a default alignment
1194 (in bytes). A negative ARG is the negative of the length of the
1195 fill pattern. BYTES_P is non-zero if the alignment value should be
1196 interpreted as the byte boundary, rather than the power of 2. */
1199 s_align (int arg, int bytes_p)
1201 register unsigned int align;
1209 stop = mri_comment_field (&stopc);
1211 if (is_end_of_line[(unsigned char) *input_line_pointer])
1216 align = arg; /* Default value from pseudo-op table. */
1220 align = get_absolute_expression ();
1226 /* Convert to a power of 2. */
1231 for (i = 0; (align & 1) == 0; align >>= 1, ++i)
1234 as_bad (_("alignment not a power of 2"));
1243 as_warn (_("alignment too large: %u assumed"), align);
1246 if (*input_line_pointer != ',')
1253 ++input_line_pointer;
1254 if (*input_line_pointer == ',')
1258 fill = get_absolute_expression ();
1263 if (*input_line_pointer != ',')
1267 ++input_line_pointer;
1268 max = get_absolute_expression ();
1275 as_warn (_("expected fill pattern missing"));
1276 do_align (align, (char *) NULL, 0, max);
1291 do_align (align, &fill_char, fill_len, max);
1297 if ((size_t) fill_len > sizeof ab)
1299 md_number_to_chars (ab, fill, fill_len);
1300 do_align (align, ab, fill_len, max);
1304 demand_empty_rest_of_line ();
1307 mri_comment_end (stop, stopc);
1310 /* Handle the .align pseudo-op on machines where ".align 4" means
1311 align to a 4 byte boundary. */
1314 s_align_bytes (int arg)
1319 /* Handle the .align pseudo-op on machines where ".align 4" means align
1320 to a 2**4 boundary. */
1323 s_align_ptwo (int arg)
1328 /* Switch in and out of alternate macro mode. */
1333 demand_empty_rest_of_line ();
1334 macro_set_alternate (on);
1338 s_comm_internal (int param,
1339 symbolS *(*comm_parse_extra) (int, symbolS *, addressT))
1345 symbolS *symbolP = NULL;
1351 stop = mri_comment_field (&stopc);
1353 name = input_line_pointer;
1354 c = get_symbol_end ();
1355 /* Just after name is now '\0'. */
1356 p = input_line_pointer;
1361 as_bad (_("expected symbol name"));
1362 discard_rest_of_line ();
1368 /* Accept an optional comma after the name. The comma used to be
1369 required, but Irix 5 cc does not generate it for .lcomm. */
1370 if (*input_line_pointer == ',')
1371 input_line_pointer++;
1374 temp = get_absolute_expr (&exp);
1376 #ifdef BFD_ASSEMBLER
1377 size &= ((offsetT) 2 << (stdoutput->arch_info->bits_per_address - 1)) - 1;
1379 if (exp.X_op == O_absent)
1381 as_bad (_("missing size expression"));
1383 ignore_rest_of_line ();
1386 else if (temp != size || !exp.X_unsigned)
1388 as_warn (_("size (%ld) out of range, ignored"), (long) temp);
1390 ignore_rest_of_line ();
1394 symbolP = symbol_find_or_make (name);
1395 if (S_IS_DEFINED (symbolP) && !S_IS_COMMON (symbolP))
1398 as_bad (_("symbol `%s' is already defined"), name);
1400 ignore_rest_of_line ();
1404 size = S_GET_VALUE (symbolP);
1407 else if (size != temp)
1408 as_warn (_("size of \"%s\" is already %ld; not changing to %ld"),
1409 name, (long) size, (long) temp);
1412 if (comm_parse_extra != NULL)
1413 symbolP = (*comm_parse_extra) (param, symbolP, size);
1416 S_SET_VALUE (symbolP, (valueT) size);
1417 S_SET_EXTERNAL (symbolP);
1420 extern int flag_one;
1421 if (size == 0 || !flag_one)
1422 S_GET_OTHER (symbolP) = const_flag;
1427 know (symbolP == NULL || symbolP->sy_frag == &zero_address_frag);
1428 demand_empty_rest_of_line ();
1431 mri_comment_end (stop, stopc);
1438 s_comm_internal (ignore, NULL);
1441 /* The MRI COMMON pseudo-op. We handle this by creating a common
1442 symbol with the appropriate name. We make s_space do the right
1443 thing by increasing the size. */
1446 s_mri_common (int small ATTRIBUTE_UNUSED)
1462 stop = mri_comment_field (&stopc);
1466 name = input_line_pointer;
1467 if (!ISDIGIT (*name))
1468 c = get_symbol_end ();
1473 ++input_line_pointer;
1475 while (ISDIGIT (*input_line_pointer));
1477 c = *input_line_pointer;
1478 *input_line_pointer = '\0';
1480 if (line_label != NULL)
1482 alc = (char *) xmalloc (strlen (S_GET_NAME (line_label))
1483 + (input_line_pointer - name)
1485 sprintf (alc, "%s%s", name, S_GET_NAME (line_label));
1490 sym = symbol_find_or_make (name);
1491 *input_line_pointer = c;
1495 if (*input_line_pointer != ',')
1499 ++input_line_pointer;
1500 align = get_absolute_expression ();
1503 if (S_IS_DEFINED (sym) && !S_IS_COMMON (sym))
1505 as_bad (_("symbol `%s' is already defined"), S_GET_NAME (sym));
1506 ignore_rest_of_line ();
1507 mri_comment_end (stop, stopc);
1511 S_SET_EXTERNAL (sym);
1512 mri_common_symbol = sym;
1516 S_SET_ALIGN (sym, align);
1519 if (line_label != NULL)
1522 exp.X_op = O_symbol;
1523 exp.X_add_symbol = sym;
1524 exp.X_add_number = 0;
1525 symbol_set_value_expression (line_label, &exp);
1526 symbol_set_frag (line_label, &zero_address_frag);
1527 S_SET_SEGMENT (line_label, expr_section);
1530 /* FIXME: We just ignore the small argument, which distinguishes
1531 COMMON and COMMON.S. I don't know what we can do about it. */
1533 /* Ignore the type and hptype. */
1534 if (*input_line_pointer == ',')
1535 input_line_pointer += 2;
1536 if (*input_line_pointer == ',')
1537 input_line_pointer += 2;
1539 demand_empty_rest_of_line ();
1541 mri_comment_end (stop, stopc);
1545 s_data (int ignore ATTRIBUTE_UNUSED)
1550 temp = get_absolute_expression ();
1551 if (flag_readonly_data_in_text)
1553 section = text_section;
1557 section = data_section;
1559 subseg_set (section, (subsegT) temp);
1564 demand_empty_rest_of_line ();
1567 /* Handle the .appfile pseudo-op. This is automatically generated by
1568 do_scrub_chars when a preprocessor # line comment is seen with a
1569 file name. This default definition may be overridden by the object
1570 or CPU specific pseudo-ops. This function is also the default
1571 definition for .file; the APPFILE argument is 1 for .appfile, 0 for
1575 s_app_file_string (char *file, int appfile)
1579 listing_source_file (file);
1581 register_dependency (file);
1583 obj_app_file (file, appfile);
1588 s_app_file (int appfile)
1593 /* Some assemblers tolerate immediately following '"'. */
1594 if ((s = demand_copy_string (&length)) != 0)
1596 /* If this is a fake .appfile, a fake newline was inserted into
1597 the buffer. Passing -2 to new_logical_line tells it to
1600 = (!new_logical_line (s, appfile ? -2 : -1) && appfile);
1602 /* In MRI mode, the preprocessor may have inserted an extraneous
1605 && *input_line_pointer == '\''
1606 && is_end_of_line[(unsigned char) input_line_pointer[1]])
1607 ++input_line_pointer;
1609 demand_empty_rest_of_line ();
1611 s_app_file_string (s, appfile);
1615 /* Handle the .appline pseudo-op. This is automatically generated by
1616 do_scrub_chars when a preprocessor # line comment is seen. This
1617 default definition may be overridden by the object or CPU specific
1621 s_app_line (int ignore ATTRIBUTE_UNUSED)
1625 /* The given number is that of the next line. */
1626 l = get_absolute_expression () - 1;
1628 /* Some of the back ends can't deal with non-positive line numbers.
1629 Besides, it's silly. */
1630 as_warn (_("line numbers must be positive; line number %d rejected"),
1634 new_logical_line ((char *) NULL, l);
1637 listing_source_line (l);
1640 demand_empty_rest_of_line ();
1643 /* Handle the .end pseudo-op. Actually, the real work is done in
1644 read_a_source_file. */
1647 s_end (int ignore ATTRIBUTE_UNUSED)
1651 /* The MRI assembler permits the start symbol to follow .end,
1652 but we don't support that. */
1654 if (!is_end_of_line[(unsigned char) *input_line_pointer]
1655 && *input_line_pointer != '*'
1656 && *input_line_pointer != '!')
1657 as_warn (_("start address not supported"));
1661 /* Handle the .err pseudo-op. */
1664 s_err (int ignore ATTRIBUTE_UNUSED)
1666 as_bad (_(".err encountered"));
1667 demand_empty_rest_of_line ();
1670 /* Handle the .error and .warning pseudo-ops. */
1676 /* The purpose for the conditional assignment is not to
1677 internationalize the directive itself, but that we need a
1678 self-contained message, one that can be passed like the
1679 demand_copy_C_string return value, and with no assumption on the
1680 location of the name of the directive within the message. */
1682 = (err ? _(".error directive invoked in source file")
1683 : _(".warning directive invoked in source file"));
1685 if (!is_it_end_of_statement ())
1687 if (*input_line_pointer != '\"')
1689 as_bad (_("%s argument must be a string"),
1690 err ? ".error" : ".warning");
1691 discard_rest_of_line ();
1695 msg = demand_copy_C_string (&len);
1703 as_warn ("%s", msg);
1704 demand_empty_rest_of_line ();
1707 /* Handle the MRI fail pseudo-op. */
1710 s_fail (int ignore ATTRIBUTE_UNUSED)
1717 stop = mri_comment_field (&stopc);
1719 temp = get_absolute_expression ();
1721 as_warn (_(".fail %ld encountered"), (long) temp);
1723 as_bad (_(".fail %ld encountered"), (long) temp);
1725 demand_empty_rest_of_line ();
1728 mri_comment_end (stop, stopc);
1732 s_fill (int ignore ATTRIBUTE_UNUSED)
1734 expressionS rep_exp;
1736 register long fill = 0;
1739 #ifdef md_flush_pending_output
1740 md_flush_pending_output ();
1743 get_known_segmented_expression (&rep_exp);
1744 if (*input_line_pointer == ',')
1746 input_line_pointer++;
1747 size = get_absolute_expression ();
1748 if (*input_line_pointer == ',')
1750 input_line_pointer++;
1751 fill = get_absolute_expression ();
1755 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
1756 #define BSD_FILL_SIZE_CROCK_8 (8)
1757 if (size > BSD_FILL_SIZE_CROCK_8)
1759 as_warn (_(".fill size clamped to %d"), BSD_FILL_SIZE_CROCK_8);
1760 size = BSD_FILL_SIZE_CROCK_8;
1764 as_warn (_("size negative; .fill ignored"));
1767 else if (rep_exp.X_op == O_constant && rep_exp.X_add_number <= 0)
1769 if (rep_exp.X_add_number < 0)
1770 as_warn (_("repeat < 0; .fill ignored"));
1774 if (size && !need_pass_2)
1776 if (rep_exp.X_op == O_constant)
1778 p = frag_var (rs_fill, (int) size, (int) size,
1779 (relax_substateT) 0, (symbolS *) 0,
1780 (offsetT) rep_exp.X_add_number,
1785 /* We don't have a constant repeat count, so we can't use
1786 rs_fill. We can get the same results out of rs_space,
1787 but its argument is in bytes, so we must multiply the
1788 repeat count by size. */
1791 rep_sym = make_expr_symbol (&rep_exp);
1794 expressionS size_exp;
1795 size_exp.X_op = O_constant;
1796 size_exp.X_add_number = size;
1798 rep_exp.X_op = O_multiply;
1799 rep_exp.X_add_symbol = rep_sym;
1800 rep_exp.X_op_symbol = make_expr_symbol (&size_exp);
1801 rep_exp.X_add_number = 0;
1802 rep_sym = make_expr_symbol (&rep_exp);
1805 p = frag_var (rs_space, (int) size, (int) size,
1806 (relax_substateT) 0, rep_sym, (offsetT) 0, (char *) 0);
1809 memset (p, 0, (unsigned int) size);
1811 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
1812 flavoured AS. The following bizarre behaviour is to be
1813 compatible with above. I guess they tried to take up to 8
1814 bytes from a 4-byte expression and they forgot to sign
1816 #define BSD_FILL_SIZE_CROCK_4 (4)
1817 md_number_to_chars (p, (valueT) fill,
1818 (size > BSD_FILL_SIZE_CROCK_4
1819 ? BSD_FILL_SIZE_CROCK_4
1821 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
1822 but emits no error message because it seems a legal thing to do.
1823 It is a degenerate case of .fill but could be emitted by a
1826 demand_empty_rest_of_line ();
1830 s_globl (int ignore ATTRIBUTE_UNUSED)
1839 stop = mri_comment_field (&stopc);
1843 name = input_line_pointer;
1844 c = get_symbol_end ();
1845 symbolP = symbol_find_or_make (name);
1846 S_SET_EXTERNAL (symbolP);
1848 *input_line_pointer = c;
1850 c = *input_line_pointer;
1853 input_line_pointer++;
1855 if (is_end_of_line[(unsigned char) *input_line_pointer])
1861 demand_empty_rest_of_line ();
1864 mri_comment_end (stop, stopc);
1867 /* Handle the MRI IRP and IRPC pseudo-ops. */
1878 as_where (&file, &line);
1881 while (!is_end_of_line[(unsigned char) *input_line_pointer])
1882 sb_add_char (&s, *input_line_pointer++);
1886 err = expand_irp (irpc, 0, &s, &out, get_line_sb);
1888 as_bad_where (file, line, "%s", err);
1892 input_scrub_include_sb (&out, input_line_pointer, 1);
1894 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
1897 /* Handle the .linkonce pseudo-op. This tells the assembler to mark
1898 the section to only be linked once. However, this is not supported
1899 by most object file formats. This takes an optional argument,
1900 which is what to do about duplicates. */
1903 s_linkonce (int ignore ATTRIBUTE_UNUSED)
1905 enum linkonce_type type;
1909 type = LINKONCE_DISCARD;
1911 if (!is_end_of_line[(unsigned char) *input_line_pointer])
1916 s = input_line_pointer;
1917 c = get_symbol_end ();
1918 if (strcasecmp (s, "discard") == 0)
1919 type = LINKONCE_DISCARD;
1920 else if (strcasecmp (s, "one_only") == 0)
1921 type = LINKONCE_ONE_ONLY;
1922 else if (strcasecmp (s, "same_size") == 0)
1923 type = LINKONCE_SAME_SIZE;
1924 else if (strcasecmp (s, "same_contents") == 0)
1925 type = LINKONCE_SAME_CONTENTS;
1927 as_warn (_("unrecognized .linkonce type `%s'"), s);
1929 *input_line_pointer = c;
1932 #ifdef obj_handle_link_once
1933 obj_handle_link_once (type);
1934 #else /* ! defined (obj_handle_link_once) */
1935 #ifdef BFD_ASSEMBLER
1939 if ((bfd_applicable_section_flags (stdoutput) & SEC_LINK_ONCE) == 0)
1940 as_warn (_(".linkonce is not supported for this object file format"));
1942 flags = bfd_get_section_flags (stdoutput, now_seg);
1943 flags |= SEC_LINK_ONCE;
1948 case LINKONCE_DISCARD:
1949 flags |= SEC_LINK_DUPLICATES_DISCARD;
1951 case LINKONCE_ONE_ONLY:
1952 flags |= SEC_LINK_DUPLICATES_ONE_ONLY;
1954 case LINKONCE_SAME_SIZE:
1955 flags |= SEC_LINK_DUPLICATES_SAME_SIZE;
1957 case LINKONCE_SAME_CONTENTS:
1958 flags |= SEC_LINK_DUPLICATES_SAME_CONTENTS;
1961 if (!bfd_set_section_flags (stdoutput, now_seg, flags))
1962 as_bad (_("bfd_set_section_flags: %s"),
1963 bfd_errmsg (bfd_get_error ()));
1965 #else /* ! defined (BFD_ASSEMBLER) */
1966 as_warn (_(".linkonce is not supported for this object file format"));
1967 #endif /* ! defined (BFD_ASSEMBLER) */
1968 #endif /* ! defined (obj_handle_link_once) */
1970 demand_empty_rest_of_line ();
1974 bss_alloc (symbolS *symbolP, addressT size, int align)
1977 segT current_seg = now_seg;
1978 subsegT current_subseg = now_subseg;
1979 segT bss_seg = bss_section;
1981 #if defined (TC_MIPS) || defined (TC_ALPHA)
1982 if (OUTPUT_FLAVOR == bfd_target_ecoff_flavour
1983 || OUTPUT_FLAVOR == bfd_target_elf_flavour)
1985 /* For MIPS and Alpha ECOFF or ELF, small objects are put in .sbss. */
1986 if (size <= bfd_get_gp_size (stdoutput))
1988 bss_seg = subseg_new (".sbss", 1);
1989 seg_info (bss_seg)->bss = 1;
1990 #ifdef BFD_ASSEMBLER
1991 if (!bfd_set_section_flags (stdoutput, bss_seg, SEC_ALLOC))
1992 as_warn (_("error setting flags for \".sbss\": %s"),
1993 bfd_errmsg (bfd_get_error ()));
1998 subseg_set (bss_seg, 1);
2002 record_alignment (bss_seg, align);
2003 frag_align (align, 0, 0);
2006 /* Detach from old frag. */
2007 if (S_GET_SEGMENT (symbolP) == bss_seg)
2008 symbol_get_frag (symbolP)->fr_symbol = NULL;
2010 symbol_set_frag (symbolP, frag_now);
2011 pfrag = frag_var (rs_org, 1, 1, 0, symbolP, size, NULL);
2015 S_SET_SIZE (symbolP, size);
2017 S_SET_SEGMENT (symbolP, bss_seg);
2020 /* The symbol may already have been created with a preceding
2021 ".globl" directive -- be careful not to step on storage class
2022 in that case. Otherwise, set it to static. */
2023 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
2024 S_SET_STORAGE_CLASS (symbolP, C_STAT);
2025 #endif /* OBJ_COFF */
2027 subseg_set (current_seg, current_subseg);
2031 parse_align (int align_bytes)
2037 if (*input_line_pointer != ',')
2040 as_bad (_("expected alignment after size"));
2041 ignore_rest_of_line ();
2045 input_line_pointer++;
2048 align = get_absolute_expr (&exp);
2049 if (exp.X_op == O_absent)
2052 if (!exp.X_unsigned)
2054 as_warn (_("alignment negative; 0 assumed"));
2058 if (align_bytes && align != 0)
2060 /* convert to a power of 2 alignment */
2061 unsigned int alignp2 = 0;
2062 while ((align & 1) == 0)
2063 align >>= 1, ++alignp2;
2066 as_bad (_("alignment not a power of 2"));
2067 ignore_rest_of_line ();
2075 /* Called from s_comm_internal after symbol name and size have been
2076 parsed. NEEDS_ALIGN is 0 if it was an ".lcomm" (2 args only),
2077 1 if this was a ".bss" directive which has a 3rd argument
2078 (alignment as a power of 2), or 2 if this was a ".bss" directive
2079 with alignment in bytes. */
2082 s_lcomm_internal (int needs_align, symbolS *symbolP, addressT size)
2088 align = parse_align (needs_align - 1);
2089 if (align == (addressT) -1)
2093 /* Assume some objects may require alignment on some systems. */
2094 TC_IMPLICIT_LCOMM_ALIGNMENT (size, align);
2096 bss_alloc (symbolP, size, align);
2101 s_lcomm (int needs_align)
2103 s_comm_internal (needs_align, s_lcomm_internal);
2107 s_lcomm_bytes (int needs_align)
2109 s_comm_internal (needs_align * 2, s_lcomm_internal);
2113 s_lsym (int ignore ATTRIBUTE_UNUSED)
2115 register char *name;
2119 register symbolS *symbolP;
2121 /* We permit ANY defined expression: BSD4.2 demands constants. */
2122 name = input_line_pointer;
2123 c = get_symbol_end ();
2124 p = input_line_pointer;
2129 as_bad (_("expected symbol name"));
2130 discard_rest_of_line ();
2136 if (*input_line_pointer != ',')
2139 as_bad (_("expected comma after \"%s\""), name);
2141 ignore_rest_of_line ();
2145 input_line_pointer++;
2148 if (exp.X_op != O_constant
2149 && exp.X_op != O_register)
2151 as_bad (_("bad expression"));
2152 ignore_rest_of_line ();
2157 symbolP = symbol_find_or_make (name);
2159 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
2160 symbolP->sy_desc == 0) out of this test because coff doesn't have
2161 those fields, and I can't see when they'd ever be tripped. I
2162 don't think I understand why they were here so I may have
2163 introduced a bug. As recently as 1.37 didn't have this test
2164 anyway. xoxorich. */
2166 if (S_GET_SEGMENT (symbolP) == undefined_section
2167 && S_GET_VALUE (symbolP) == 0)
2169 /* The name might be an undefined .global symbol; be sure to
2170 keep the "external" bit. */
2171 S_SET_SEGMENT (symbolP,
2172 (exp.X_op == O_constant
2175 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
2179 as_bad (_("symbol `%s' is already defined"), name);
2183 demand_empty_rest_of_line ();
2186 /* Read a line into an sb. Returns the character that ended the line
2187 or zero if there are no more lines. */
2190 get_line_sb (sb *line)
2192 char quote1, quote2, inquote;
2195 if (input_line_pointer[-1] == '\n')
2196 bump_line_counters ();
2198 if (input_line_pointer >= buffer_limit)
2200 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2201 if (buffer_limit == 0)
2205 /* If app.c sets any other characters to LEX_IS_STRINGQUOTE, this
2206 code needs to be changed. */
2215 #ifdef LEX_IS_STRINGQUOTE
2221 while ((c = * input_line_pointer ++) != 0
2222 && (!is_end_of_line[c]
2223 || (inquote != '\0' && c != '\n')))
2227 else if (inquote == '\0')
2231 else if (c == quote2)
2235 sb_add_char (line, c);
2238 /* Don't skip multiple end-of-line characters, because that breaks support
2239 for the IA-64 stop bit (;;) which looks like two consecutive end-of-line
2240 characters but isn't. Instead just skip one end of line character and
2241 return the character skipped so that the caller can re-insert it if
2246 /* Define a macro. This is an interface to macro.c. */
2249 s_macro (int ignore ATTRIBUTE_UNUSED)
2258 as_where (&file, &line);
2261 while (!is_end_of_line[(unsigned char) *input_line_pointer])
2262 sb_add_char (&s, *input_line_pointer++);
2265 if (line_label != NULL)
2266 sb_add_string (&label, S_GET_NAME (line_label));
2268 err = define_macro (0, &s, &label, get_line_sb, &name);
2270 as_bad_where (file, line, "%s", err);
2273 if (line_label != NULL)
2275 S_SET_SEGMENT (line_label, undefined_section);
2276 S_SET_VALUE (line_label, 0);
2277 symbol_set_frag (line_label, &zero_address_frag);
2280 if (((NO_PSEUDO_DOT || flag_m68k_mri)
2281 && hash_find (po_hash, name) != NULL)
2284 && hash_find (po_hash, name + 1) != NULL))
2285 as_warn (_("attempt to redefine pseudo-op `%s' ignored"),
2292 /* Handle the .mexit pseudo-op, which immediately exits a macro
2296 s_mexit (int ignore ATTRIBUTE_UNUSED)
2298 cond_exit_macro (macro_nest);
2299 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2302 /* Switch in and out of MRI mode. */
2305 s_mri (int ignore ATTRIBUTE_UNUSED)
2309 on = get_absolute_expression ();
2310 old_flag = flag_mri;
2328 /* Operator precedence changes in m68k MRI mode, so we need to
2329 update the operator rankings. */
2330 expr_set_precedence ();
2332 #ifdef MRI_MODE_CHANGE
2334 MRI_MODE_CHANGE (on);
2337 demand_empty_rest_of_line ();
2340 /* Handle changing the location counter. */
2343 do_org (segT segment, expressionS *exp, int fill)
2345 if (segment != now_seg && segment != absolute_section)
2346 as_bad (_("invalid segment \"%s\""), segment_name (segment));
2348 if (now_seg == absolute_section)
2351 as_warn (_("ignoring fill value in absolute section"));
2352 if (exp->X_op != O_constant)
2354 as_bad (_("only constant offsets supported in absolute section"));
2355 exp->X_add_number = 0;
2357 abs_section_offset = exp->X_add_number;
2362 symbolS *sym = exp->X_add_symbol;
2363 offsetT off = exp->X_add_number * OCTETS_PER_BYTE;
2365 if (exp->X_op != O_constant && exp->X_op != O_symbol)
2367 /* Handle complex expressions. */
2368 sym = make_expr_symbol (exp);
2372 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, sym, off, (char *) 0);
2378 s_org (int ignore ATTRIBUTE_UNUSED)
2380 register segT segment;
2382 register long temp_fill;
2384 #ifdef md_flush_pending_output
2385 md_flush_pending_output ();
2388 /* The m68k MRI assembler has a different meaning for .org. It
2389 means to create an absolute section at a given address. We can't
2390 support that--use a linker script instead. */
2393 as_bad (_("MRI style ORG pseudo-op not supported"));
2394 ignore_rest_of_line ();
2398 /* Don't believe the documentation of BSD 4.2 AS. There is no such
2399 thing as a sub-segment-relative origin. Any absolute origin is
2400 given a warning, then assumed to be segment-relative. Any
2401 segmented origin expression ("foo+42") had better be in the right
2402 segment or the .org is ignored.
2404 BSD 4.2 AS warns if you try to .org backwards. We cannot because
2405 we never know sub-segment sizes when we are reading code. BSD
2406 will crash trying to emit negative numbers of filler bytes in
2407 certain .orgs. We don't crash, but see as-write for that code.
2409 Don't make frag if need_pass_2==1. */
2410 segment = get_known_segmented_expression (&exp);
2411 if (*input_line_pointer == ',')
2413 input_line_pointer++;
2414 temp_fill = get_absolute_expression ();
2420 do_org (segment, &exp, temp_fill);
2422 demand_empty_rest_of_line ();
2425 /* Handle parsing for the MRI SECT/SECTION pseudo-op. This should be
2426 called by the obj-format routine which handles section changing
2427 when in MRI mode. It will create a new section, and return it. It
2428 will set *TYPE to the section type: one of 'C' (code), 'D' (data),
2429 'M' (mixed), or 'R' (romable). If BFD_ASSEMBLER is defined, the
2430 flags will be set in the section. */
2433 s_mri_sect (char *type ATTRIBUTE_UNUSED)
2443 name = input_line_pointer;
2444 if (!ISDIGIT (*name))
2445 c = get_symbol_end ();
2450 ++input_line_pointer;
2452 while (ISDIGIT (*input_line_pointer));
2454 c = *input_line_pointer;
2455 *input_line_pointer = '\0';
2458 name = xstrdup (name);
2460 *input_line_pointer = c;
2462 seg = subseg_new (name, 0);
2464 if (*input_line_pointer == ',')
2468 ++input_line_pointer;
2469 align = get_absolute_expression ();
2470 record_alignment (seg, align);
2474 if (*input_line_pointer == ',')
2476 c = *++input_line_pointer;
2478 if (c == 'C' || c == 'D' || c == 'M' || c == 'R')
2481 as_bad (_("unrecognized section type"));
2482 ++input_line_pointer;
2484 #ifdef BFD_ASSEMBLER
2488 flags = SEC_NO_FLAGS;
2490 flags = SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE;
2491 else if (*type == 'D' || *type == 'M')
2492 flags = SEC_ALLOC | SEC_LOAD | SEC_DATA;
2493 else if (*type == 'R')
2494 flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_READONLY | SEC_ROM;
2495 if (flags != SEC_NO_FLAGS)
2497 if (!bfd_set_section_flags (stdoutput, seg, flags))
2498 as_warn (_("error setting flags for \"%s\": %s"),
2499 bfd_section_name (stdoutput, seg),
2500 bfd_errmsg (bfd_get_error ()));
2506 /* Ignore the HP type. */
2507 if (*input_line_pointer == ',')
2508 input_line_pointer += 2;
2510 demand_empty_rest_of_line ();
2512 #else /* ! TC_M68K */
2521 name = input_line_pointer;
2522 c = get_symbol_end ();
2524 name = xstrdup (name);
2526 *input_line_pointer = c;
2528 seg = subseg_new (name, 0);
2530 if (*input_line_pointer != ',')
2536 ++input_line_pointer;
2538 sectype = input_line_pointer;
2539 c = get_symbol_end ();
2540 if (*sectype == '\0')
2542 else if (strcasecmp (sectype, "text") == 0)
2544 else if (strcasecmp (sectype, "data") == 0)
2546 else if (strcasecmp (sectype, "romdata") == 0)
2549 as_warn (_("unrecognized section type `%s'"), sectype);
2550 *input_line_pointer = c;
2553 if (*input_line_pointer == ',')
2557 ++input_line_pointer;
2559 seccmd = input_line_pointer;
2560 c = get_symbol_end ();
2561 if (strcasecmp (seccmd, "absolute") == 0)
2563 as_bad (_("absolute sections are not supported"));
2564 *input_line_pointer = c;
2565 ignore_rest_of_line ();
2568 else if (strcasecmp (seccmd, "align") == 0)
2572 *input_line_pointer = c;
2573 align = get_absolute_expression ();
2574 record_alignment (seg, align);
2578 as_warn (_("unrecognized section command `%s'"), seccmd);
2579 *input_line_pointer = c;
2583 demand_empty_rest_of_line ();
2585 #else /* ! TC_I960 */
2586 /* The MRI assembler seems to use different forms of .sect for
2587 different targets. */
2588 as_bad ("MRI mode not supported for this target");
2589 ignore_rest_of_line ();
2590 #endif /* ! TC_I960 */
2591 #endif /* ! TC_M68K */
2594 /* Handle the .print pseudo-op. */
2597 s_print (int ignore ATTRIBUTE_UNUSED)
2602 s = demand_copy_C_string (&len);
2605 demand_empty_rest_of_line ();
2608 /* Handle the .purgem pseudo-op. */
2611 s_purgem (int ignore ATTRIBUTE_UNUSED)
2613 if (is_it_end_of_statement ())
2615 demand_empty_rest_of_line ();
2625 name = input_line_pointer;
2626 c = get_symbol_end ();
2627 delete_macro (name);
2628 *input_line_pointer = c;
2631 while (*input_line_pointer++ == ',');
2633 --input_line_pointer;
2634 demand_empty_rest_of_line ();
2637 /* Handle the .rept pseudo-op. */
2640 s_bad_endr (int ignore ATTRIBUTE_UNUSED)
2642 as_warn (_(".endr encountered without preceeding .rept, .irc, or .irp"));
2643 demand_empty_rest_of_line ();
2646 /* Handle the .rept pseudo-op. */
2649 s_rept (int ignore ATTRIBUTE_UNUSED)
2653 count = get_absolute_expression ();
2655 do_repeat (count, "REPT", "ENDR");
2658 /* This function provides a generic repeat block implementation. It allows
2659 different directives to be used as the start/end keys. */
2662 do_repeat (int count, const char *start, const char *end)
2668 if (!buffer_and_nest (start, end, &one, get_line_sb))
2670 as_bad (_("%s without %s"), start, end);
2676 sb_add_sb (&many, &one);
2680 input_scrub_include_sb (&many, input_line_pointer, 1);
2682 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2685 /* Skip to end of current repeat loop; EXTRA indicates how many additional
2686 input buffers to skip. Assumes that conditionals preceding the loop end
2687 are properly nested.
2689 This function makes it easier to implement a premature "break" out of the
2690 loop. The EXTRA arg accounts for other buffers we might have inserted,
2691 such as line substitutions. */
2694 end_repeat (int extra)
2696 cond_exit_macro (macro_nest);
2697 while (extra-- >= 0)
2698 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2701 /* Handle the .equ, .equiv and .set directives. If EQUIV is 1, then
2702 this is .equiv, and it is an error if the symbol is already
2708 register char *name;
2709 register char delim;
2710 register char *end_name;
2711 register symbolS *symbolP;
2713 /* Especial apologies for the random logic:
2714 this just grew, and could be parsed much more simply!
2716 name = input_line_pointer;
2717 delim = get_symbol_end ();
2718 end_name = input_line_pointer;
2721 if (name == end_name)
2723 as_bad (_("expected symbol name"));
2724 discard_rest_of_line ();
2730 if (*input_line_pointer != ',')
2733 as_bad (_("expected comma after \"%s\""), name);
2735 ignore_rest_of_line ();
2739 input_line_pointer++;
2742 if (name[0] == '.' && name[1] == '\0')
2744 /* Turn '. = mumble' into a .org mumble. */
2745 register segT segment;
2748 segment = get_known_segmented_expression (&exp);
2751 do_org (segment, &exp, 0);
2757 if ((symbolP = symbol_find (name)) == NULL
2758 && (symbolP = md_undefined_symbol (name)) == NULL)
2761 /* When doing symbol listings, play games with dummy fragments living
2762 outside the normal fragment chain to record the file and line info
2764 if (listing & LISTING_SYMBOLS)
2766 extern struct list_info_struct *listing_tail;
2767 fragS *dummy_frag = (fragS *) xmalloc (sizeof (fragS));
2768 memset (dummy_frag, 0, sizeof (fragS));
2769 dummy_frag->fr_type = rs_fill;
2770 dummy_frag->line = listing_tail;
2771 symbolP = symbol_new (name, undefined_section, 0, dummy_frag);
2772 dummy_frag->fr_symbol = symbolP;
2776 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
2779 /* "set" symbols are local unless otherwise specified. */
2780 SF_SET_LOCAL (symbolP);
2781 #endif /* OBJ_COFF */
2784 symbol_table_insert (symbolP);
2789 && S_IS_DEFINED (symbolP)
2790 && S_GET_SEGMENT (symbolP) != reg_section)
2791 as_bad (_("symbol `%s' is already defined"), S_GET_NAME (symbolP));
2793 pseudo_set (symbolP);
2794 demand_empty_rest_of_line ();
2807 #ifdef md_flush_pending_output
2808 md_flush_pending_output ();
2812 stop = mri_comment_field (&stopc);
2814 /* In m68k MRI mode, we need to align to a word boundary, unless
2816 if (flag_m68k_mri && mult > 1)
2818 if (now_seg == absolute_section)
2820 abs_section_offset += abs_section_offset & 1;
2821 if (line_label != NULL)
2822 S_SET_VALUE (line_label, abs_section_offset);
2824 else if (mri_common_symbol != NULL)
2828 val = S_GET_VALUE (mri_common_symbol);
2831 S_SET_VALUE (mri_common_symbol, val + 1);
2832 if (line_label != NULL)
2834 expressionS *symexp;
2836 symexp = symbol_get_value_expression (line_label);
2837 know (symexp->X_op == O_symbol);
2838 know (symexp->X_add_symbol == mri_common_symbol);
2839 symexp->X_add_number += 1;
2845 do_align (1, (char *) NULL, 0, 0);
2846 if (line_label != NULL)
2848 symbol_set_frag (line_label, frag_now);
2849 S_SET_VALUE (line_label, frag_now_fix ());
2859 if (*input_line_pointer == ',')
2861 ++input_line_pointer;
2866 val.X_op = O_constant;
2867 val.X_add_number = 0;
2870 if (val.X_op != O_constant
2871 || val.X_add_number < - 0x80
2872 || val.X_add_number > 0xff
2873 || (mult != 0 && mult != 1 && val.X_add_number != 0))
2875 if (exp.X_op != O_constant)
2876 as_bad (_("unsupported variable size or fill value"));
2883 bytes = mult * exp.X_add_number;
2884 for (i = 0; i < exp.X_add_number; i++)
2885 emit_expr (&val, mult);
2890 if (exp.X_op == O_constant)
2894 repeat = exp.X_add_number;
2901 as_warn (_(".space repeat count is zero, ignored"));
2902 else if (repeat < 0)
2903 as_warn (_(".space repeat count is negative, ignored"));
2907 /* If we are in the absolute section, just bump the offset. */
2908 if (now_seg == absolute_section)
2910 abs_section_offset += repeat;
2914 /* If we are secretly in an MRI common section, then
2915 creating space just increases the size of the common
2917 if (mri_common_symbol != NULL)
2919 S_SET_VALUE (mri_common_symbol,
2920 S_GET_VALUE (mri_common_symbol) + repeat);
2925 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
2926 (offsetT) repeat, (char *) 0);
2930 if (now_seg == absolute_section)
2932 as_bad (_("space allocation too complex in absolute section"));
2933 subseg_set (text_section, 0);
2936 if (mri_common_symbol != NULL)
2938 as_bad (_("space allocation too complex in common section"));
2939 mri_common_symbol = NULL;
2943 p = frag_var (rs_space, 1, 1, (relax_substateT) 0,
2944 make_expr_symbol (&exp), (offsetT) 0, (char *) 0);
2948 *p = val.X_add_number;
2953 /* In MRI mode, after an odd number of bytes, we must align to an
2954 even word boundary, unless the next instruction is a dc.b, ds.b
2956 if (flag_mri && (bytes & 1) != 0)
2957 mri_pending_align = 1;
2959 demand_empty_rest_of_line ();
2962 mri_comment_end (stop, stopc);
2965 /* This is like s_space, but the value is a floating point number with
2966 the given precision. This is for the MRI dcb.s pseudo-op and
2970 s_float_space (int float_type)
2974 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2979 stop = mri_comment_field (&stopc);
2981 count = get_absolute_expression ();
2984 if (*input_line_pointer != ',')
2986 as_bad (_("missing value"));
2987 ignore_rest_of_line ();
2989 mri_comment_end (stop, stopc);
2993 ++input_line_pointer;
2997 /* Skip any 0{letter} that may be present. Don't even check if the
2998 * letter is legal. */
2999 if (input_line_pointer[0] == '0'
3000 && ISALPHA (input_line_pointer[1]))
3001 input_line_pointer += 2;
3003 /* Accept :xxxx, where the x's are hex digits, for a floating point
3004 with the exact digits specified. */
3005 if (input_line_pointer[0] == ':')
3007 flen = hex_float (float_type, temp);
3010 ignore_rest_of_line ();
3012 mri_comment_end (stop, stopc);
3020 err = md_atof (float_type, temp, &flen);
3021 know (flen <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
3025 as_bad (_("bad floating literal: %s"), err);
3026 ignore_rest_of_line ();
3028 mri_comment_end (stop, stopc);
3033 while (--count >= 0)
3037 p = frag_more (flen);
3038 memcpy (p, temp, (unsigned int) flen);
3041 demand_empty_rest_of_line ();
3044 mri_comment_end (stop, stopc);
3047 /* Handle the .struct pseudo-op, as found in MIPS assemblers. */
3050 s_struct (int ignore ATTRIBUTE_UNUSED)
3056 stop = mri_comment_field (&stopc);
3057 abs_section_offset = get_absolute_expression ();
3058 subseg_set (absolute_section, 0);
3059 demand_empty_rest_of_line ();
3061 mri_comment_end (stop, stopc);
3065 s_text (int ignore ATTRIBUTE_UNUSED)
3069 temp = get_absolute_expression ();
3070 subseg_set (text_section, (subsegT) temp);
3071 demand_empty_rest_of_line ();
3073 const_flag &= ~IN_DEFAULT_SECTION;
3078 /* Verify that we are at the end of a line. If not, issue an error and
3082 demand_empty_rest_of_line (void)
3085 if (is_end_of_line[(unsigned char) *input_line_pointer])
3086 input_line_pointer++;
3089 if (ISPRINT (*input_line_pointer))
3090 as_bad (_("junk at end of line, first unrecognized character is `%c'"),
3091 *input_line_pointer);
3093 as_bad (_("junk at end of line, first unrecognized character valued 0x%x"),
3094 *input_line_pointer);
3095 ignore_rest_of_line ();
3098 /* Return pointing just after end-of-line. */
3099 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
3102 /* Silently advance to the end of line. Use this after already having
3103 issued an error about something bad. */
3106 ignore_rest_of_line (void)
3108 while (input_line_pointer < buffer_limit
3109 && !is_end_of_line[(unsigned char) *input_line_pointer])
3110 input_line_pointer++;
3112 input_line_pointer++;
3114 /* Return pointing just after end-of-line. */
3115 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
3119 discard_rest_of_line (void)
3121 while (input_line_pointer < buffer_limit
3122 && !is_end_of_line[(unsigned char) *input_line_pointer])
3123 input_line_pointer++;
3125 input_line_pointer++;
3127 /* Return pointing just after end-of-line. */
3128 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
3131 /* In: Pointer to a symbol.
3132 Input_line_pointer->expression.
3134 Out: Input_line_pointer->just after any whitespace after expression.
3135 Tried to set symbol to value of expression.
3136 Will change symbols type, value, and frag; */
3139 pseudo_set (symbolS *symbolP)
3142 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
3144 #endif /* OBJ_AOUT or OBJ_BOUT */
3146 know (symbolP); /* NULL pointer is logic error. */
3147 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
3148 ext = S_IS_EXTERNAL (symbolP);
3149 #endif /* OBJ_AOUT or OBJ_BOUT */
3151 (void) expression (&exp);
3153 if (exp.X_op == O_illegal)
3154 as_bad (_("illegal expression"));
3155 else if (exp.X_op == O_absent)
3156 as_bad (_("missing expression"));
3157 else if (exp.X_op == O_big)
3159 if (exp.X_add_number > 0)
3160 as_bad (_("bignum invalid"));
3162 as_bad (_("floating point number invalid"));
3164 else if (exp.X_op == O_subtract
3165 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
3166 && (symbol_get_frag (exp.X_add_symbol)
3167 == symbol_get_frag (exp.X_op_symbol)))
3169 exp.X_op = O_constant;
3170 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
3171 - S_GET_VALUE (exp.X_op_symbol));
3179 exp.X_add_number = 0;
3182 S_SET_SEGMENT (symbolP, absolute_section);
3183 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
3185 S_SET_EXTERNAL (symbolP);
3187 S_CLEAR_EXTERNAL (symbolP);
3188 #endif /* OBJ_AOUT or OBJ_BOUT */
3189 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
3190 if (exp.X_op != O_constant)
3191 symbol_set_frag (symbolP, &zero_address_frag);
3195 S_SET_SEGMENT (symbolP, reg_section);
3196 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
3197 symbol_set_frag (symbolP, &zero_address_frag);
3201 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section
3202 || exp.X_add_number != 0)
3203 symbol_set_value_expression (symbolP, &exp);
3204 else if (symbol_section_p (symbolP))
3205 as_bad ("attempt to set value of section symbol");
3208 symbolS *s = exp.X_add_symbol;
3210 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (s));
3211 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
3213 S_SET_EXTERNAL (symbolP);
3215 S_CLEAR_EXTERNAL (symbolP);
3216 #endif /* OBJ_AOUT or OBJ_BOUT */
3217 S_SET_VALUE (symbolP,
3218 exp.X_add_number + S_GET_VALUE (s));
3219 symbol_set_frag (symbolP, symbol_get_frag (s));
3220 copy_symbol_attributes (symbolP, s);
3225 /* The value is some complex expression.
3226 FIXME: Should we set the segment to anything? */
3227 symbol_set_value_expression (symbolP, &exp);
3234 CONStruct more frag of .bytes, or .words etc.
3235 Should need_pass_2 be 1 then emit no frag(s).
3236 This understands EXPRESSIONS.
3240 This has a split personality. We use expression() to read the
3241 value. We can detect if the value won't fit in a byte or word.
3242 But we can't detect if expression() discarded significant digits
3243 in the case of a long. Not worth the crocks required to fix it. */
3245 /* Select a parser for cons expressions. */
3247 /* Some targets need to parse the expression in various fancy ways.
3248 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
3249 (for example, the HPPA does this). Otherwise, you can define
3250 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
3251 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
3252 are defined, which is the normal case, then only simple expressions
3257 parse_mri_cons (expressionS *exp, unsigned int nbytes);
3260 #ifndef TC_PARSE_CONS_EXPRESSION
3261 #ifdef BITFIELD_CONS_EXPRESSIONS
3262 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
3264 parse_bitfield_cons (expressionS *exp, unsigned int nbytes);
3266 #ifdef REPEAT_CONS_EXPRESSIONS
3267 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
3269 parse_repeat_cons (expressionS *exp, unsigned int nbytes);
3272 /* If we haven't gotten one yet, just call expression. */
3273 #ifndef TC_PARSE_CONS_EXPRESSION
3274 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
3279 do_parse_cons_expression (expressionS *exp,
3280 int nbytes ATTRIBUTE_UNUSED)
3282 TC_PARSE_CONS_EXPRESSION (exp, nbytes);
3286 /* Worker to do .byte etc statements.
3287 Clobbers input_line_pointer and checks end-of-line. */
3290 cons_worker (register int nbytes, /* 1=.byte, 2=.word, 4=.long. */
3298 #ifdef md_flush_pending_output
3299 md_flush_pending_output ();
3303 stop = mri_comment_field (&stopc);
3305 if (is_it_end_of_statement ())
3307 demand_empty_rest_of_line ();
3309 mri_comment_end (stop, stopc);
3313 #ifdef md_cons_align
3314 md_cons_align (nbytes);
3322 parse_mri_cons (&exp, (unsigned int) nbytes);
3325 TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
3329 if (exp.X_op == O_symbol)
3330 exp.X_op = O_symbol_rva;
3332 as_fatal (_("rva without symbol"));
3334 emit_expr (&exp, (unsigned int) nbytes);
3337 while (*input_line_pointer++ == ',');
3339 /* In MRI mode, after an odd number of bytes, we must align to an
3340 even word boundary, unless the next instruction is a dc.b, ds.b
3342 if (flag_mri && nbytes == 1 && (c & 1) != 0)
3343 mri_pending_align = 1;
3345 input_line_pointer--; /* Put terminator back into stream. */
3347 demand_empty_rest_of_line ();
3350 mri_comment_end (stop, stopc);
3356 cons_worker (size, 0);
3362 cons_worker (size, 1);
3365 /* Put the contents of expression EXP into the object file using
3366 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
3369 emit_expr (expressionS *exp, unsigned int nbytes)
3373 valueT extra_digit = 0;
3375 /* Don't do anything if we are going to make another pass. */
3379 dot_value = frag_now_fix ();
3383 /* When gcc emits DWARF 1 debugging pseudo-ops, a line number will
3384 appear as a four byte positive constant in the .line section,
3385 followed by a 2 byte 0xffff. Look for that case here. */
3387 static int dwarf_line = -1;
3389 if (strcmp (segment_name (now_seg), ".line") != 0)
3391 else if (dwarf_line >= 0
3393 && exp->X_op == O_constant
3394 && (exp->X_add_number == -1 || exp->X_add_number == 0xffff))
3395 listing_source_line ((unsigned int) dwarf_line);
3396 else if (nbytes == 4
3397 && exp->X_op == O_constant
3398 && exp->X_add_number >= 0)
3399 dwarf_line = exp->X_add_number;
3404 /* When gcc emits DWARF 1 debugging pseudo-ops, a file name will
3405 appear as a 2 byte TAG_compile_unit (0x11) followed by a 2 byte
3406 AT_sibling (0x12) followed by a four byte address of the sibling
3407 followed by a 2 byte AT_name (0x38) followed by the name of the
3408 file. We look for that case here. */
3410 static int dwarf_file = 0;
3412 if (strcmp (segment_name (now_seg), ".debug") != 0)
3414 else if (dwarf_file == 0
3416 && exp->X_op == O_constant
3417 && exp->X_add_number == 0x11)
3419 else if (dwarf_file == 1
3421 && exp->X_op == O_constant
3422 && exp->X_add_number == 0x12)
3424 else if (dwarf_file == 2
3427 else if (dwarf_file == 3
3429 && exp->X_op == O_constant
3430 && exp->X_add_number == 0x38)
3435 /* The variable dwarf_file_string tells stringer that the string
3436 may be the name of the source file. */
3437 if (dwarf_file == 4)
3438 dwarf_file_string = 1;
3440 dwarf_file_string = 0;
3445 if (check_eh_frame (exp, &nbytes))
3450 /* Allow `.word 0' in the absolute section. */
3451 if (now_seg == absolute_section)
3453 if (op != O_constant || exp->X_add_number != 0)
3454 as_bad (_("attempt to store value in absolute section"));
3455 abs_section_offset += nbytes;
3459 /* Handle a negative bignum. */
3461 && exp->X_add_number == 0
3462 && symbol_get_value_expression (exp->X_add_symbol)->X_op == O_big
3463 && symbol_get_value_expression (exp->X_add_symbol)->X_add_number > 0)
3466 unsigned long carry;
3468 exp = symbol_get_value_expression (exp->X_add_symbol);
3470 /* Negate the bignum: one's complement each digit and add 1. */
3472 for (i = 0; i < exp->X_add_number; i++)
3476 next = (((~(generic_bignum[i] & LITTLENUM_MASK))
3479 generic_bignum[i] = next & LITTLENUM_MASK;
3480 carry = next >> LITTLENUM_NUMBER_OF_BITS;
3483 /* We can ignore any carry out, because it will be handled by
3484 extra_digit if it is needed. */
3486 extra_digit = (valueT) -1;
3490 if (op == O_absent || op == O_illegal)
3492 as_warn (_("zero assumed for missing expression"));
3493 exp->X_add_number = 0;
3496 else if (op == O_big && exp->X_add_number <= 0)
3498 as_bad (_("floating point number invalid"));
3499 exp->X_add_number = 0;
3502 else if (op == O_register)
3504 as_warn (_("register value used as expression"));
3508 p = frag_more ((int) nbytes);
3510 #ifndef WORKING_DOT_WORD
3511 /* If we have the difference of two symbols in a word, save it on
3512 the broken_words list. See the code in write.c. */
3513 if (op == O_subtract && nbytes == 2)
3515 struct broken_word *x;
3517 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
3518 x->next_broken_word = broken_words;
3521 x->subseg = now_subseg;
3523 x->word_goes_here = p;
3525 x->add = exp->X_add_symbol;
3526 x->sub = exp->X_op_symbol;
3527 x->addnum = exp->X_add_number;
3535 /* If we have an integer, but the number of bytes is too large to
3536 pass to md_number_to_chars, handle it as a bignum. */
3537 if (op == O_constant && nbytes > sizeof (valueT))
3542 if (!exp->X_unsigned && exp->X_add_number < 0)
3543 extra_digit = (valueT) -1;
3544 val = (valueT) exp->X_add_number;
3548 generic_bignum[gencnt] = val & LITTLENUM_MASK;
3549 val >>= LITTLENUM_NUMBER_OF_BITS;
3553 op = exp->X_op = O_big;
3554 exp->X_add_number = gencnt;
3557 if (op == O_constant)
3559 register valueT get;
3560 register valueT use;
3561 register valueT mask;
3563 register valueT unmask;
3565 /* JF << of >= number of bits in the object is undefined. In
3566 particular SPARC (Sun 4) has problems. */
3567 if (nbytes >= sizeof (valueT))
3570 if (nbytes > sizeof (valueT))
3573 hibit = (valueT) 1 << (nbytes * BITS_PER_CHAR - 1);
3577 /* Don't store these bits. */
3578 mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes);
3579 hibit = (valueT) 1 << (nbytes * BITS_PER_CHAR - 1);
3582 unmask = ~mask; /* Do store these bits. */
3585 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
3586 mask = ~(unmask >> 1); /* Includes sign bit now. */
3589 get = exp->X_add_number;
3591 if ((get & mask) != 0
3592 && ((get & mask) != mask
3593 || (get & hibit) == 0))
3594 { /* Leading bits contain both 0s & 1s. */
3595 as_warn (_("value 0x%lx truncated to 0x%lx"),
3596 (unsigned long) get, (unsigned long) use);
3598 /* Put bytes in right order. */
3599 md_number_to_chars (p, use, (int) nbytes);
3601 else if (op == O_big)
3604 LITTLENUM_TYPE *nums;
3606 know (nbytes % CHARS_PER_LITTLENUM == 0);
3608 size = exp->X_add_number * CHARS_PER_LITTLENUM;
3611 as_warn (_("bignum truncated to %d bytes"), nbytes);
3615 if (target_big_endian)
3617 while (nbytes > size)
3619 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
3620 nbytes -= CHARS_PER_LITTLENUM;
3621 p += CHARS_PER_LITTLENUM;
3624 nums = generic_bignum + size / CHARS_PER_LITTLENUM;
3625 while (size >= CHARS_PER_LITTLENUM)
3628 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
3629 size -= CHARS_PER_LITTLENUM;
3630 p += CHARS_PER_LITTLENUM;
3635 nums = generic_bignum;
3636 while (size >= CHARS_PER_LITTLENUM)
3638 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
3640 size -= CHARS_PER_LITTLENUM;
3641 p += CHARS_PER_LITTLENUM;
3642 nbytes -= CHARS_PER_LITTLENUM;
3645 while (nbytes >= CHARS_PER_LITTLENUM)
3647 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
3648 nbytes -= CHARS_PER_LITTLENUM;
3649 p += CHARS_PER_LITTLENUM;
3655 memset (p, 0, nbytes);
3657 /* Now we need to generate a fixS to record the symbol value.
3658 This is easy for BFD. For other targets it can be more
3659 complex. For very complex cases (currently, the HPPA and
3660 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
3661 want. For simpler cases, you can define TC_CONS_RELOC to be
3662 the name of the reloc code that should be stored in the fixS.
3663 If neither is defined, the code uses NO_RELOC if it is
3664 defined, and otherwise uses 0. */
3666 #ifdef BFD_ASSEMBLER
3667 #ifdef TC_CONS_FIX_NEW
3668 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
3671 bfd_reloc_code_real_type r;
3688 as_bad (_("unsupported BFD relocation size %u"), nbytes);
3692 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp,
3697 #ifdef TC_CONS_FIX_NEW
3698 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
3700 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
3701 it is defined, otherwise use NO_RELOC if it is defined,
3703 #ifndef TC_CONS_RELOC
3705 #define TC_CONS_RELOC NO_RELOC
3707 #define TC_CONS_RELOC 0
3710 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
3712 #endif /* TC_CONS_FIX_NEW */
3713 #endif /* BFD_ASSEMBLER */
3717 #ifdef BITFIELD_CONS_EXPRESSIONS
3719 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
3720 w:x,y:z, where w and y are bitwidths and x and y are values. They
3721 then pack them all together. We do a little better in that we allow
3722 them in words, longs, etc. and we'll pack them in target byte order
3725 The rules are: pack least significant bit first, if a field doesn't
3726 entirely fit, put it in the next unit. Overflowing the bitfield is
3727 explicitly *not* even a warning. The bitwidth should be considered
3730 To use this function the tc-XXX.h file should define
3731 BITFIELD_CONS_EXPRESSIONS. */
3734 parse_bitfield_cons (exp, nbytes)
3736 unsigned int nbytes;
3738 unsigned int bits_available = BITS_PER_CHAR * nbytes;
3739 char *hold = input_line_pointer;
3741 (void) expression (exp);
3743 if (*input_line_pointer == ':')
3750 unsigned long width;
3752 if (*input_line_pointer != ':')
3754 input_line_pointer = hold;
3756 } /* Next piece is not a bitfield. */
3758 /* In the general case, we can't allow
3759 full expressions with symbol
3760 differences and such. The relocation
3761 entries for symbols not defined in this
3762 assembly would require arbitrary field
3763 widths, positions, and masks which most
3764 of our current object formats don't
3767 In the specific case where a symbol
3768 *is* defined in this assembly, we
3769 *could* build fixups and track it, but
3770 this could lead to confusion for the
3771 backends. I'm lazy. I'll take any
3772 SEG_ABSOLUTE. I think that means that
3773 you can use a previous .set or
3774 .equ type symbol. xoxorich. */
3776 if (exp->X_op == O_absent)
3778 as_warn (_("using a bit field width of zero"));
3779 exp->X_add_number = 0;
3780 exp->X_op = O_constant;
3781 } /* Implied zero width bitfield. */
3783 if (exp->X_op != O_constant)
3785 *input_line_pointer = '\0';
3786 as_bad (_("field width \"%s\" too complex for a bitfield"), hold);
3787 *input_line_pointer = ':';
3788 demand_empty_rest_of_line ();
3790 } /* Too complex. */
3792 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
3794 as_warn (_("field width %lu too big to fit in %d bytes: truncated to %d bits"),
3795 width, nbytes, (BITS_PER_CHAR * nbytes));
3796 width = BITS_PER_CHAR * nbytes;
3799 if (width > bits_available)
3801 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
3802 input_line_pointer = hold;
3803 exp->X_add_number = value;
3808 hold = ++input_line_pointer;
3810 (void) expression (exp);
3811 if (exp->X_op != O_constant)
3813 char cache = *input_line_pointer;
3815 *input_line_pointer = '\0';
3816 as_bad (_("field value \"%s\" too complex for a bitfield"), hold);
3817 *input_line_pointer = cache;
3818 demand_empty_rest_of_line ();
3820 } /* Too complex. */
3822 value |= ((~(-1 << width) & exp->X_add_number)
3823 << ((BITS_PER_CHAR * nbytes) - bits_available));
3825 if ((bits_available -= width) == 0
3826 || is_it_end_of_statement ()
3827 || *input_line_pointer != ',')
3830 } /* All the bitfields we're gonna get. */
3832 hold = ++input_line_pointer;
3833 (void) expression (exp);
3836 exp->X_add_number = value;
3837 exp->X_op = O_constant;
3838 exp->X_unsigned = 1;
3842 #endif /* BITFIELD_CONS_EXPRESSIONS */
3844 /* Handle an MRI style string expression. */
3848 parse_mri_cons (exp, nbytes)
3850 unsigned int nbytes;
3852 if (*input_line_pointer != '\''
3853 && (input_line_pointer[1] != '\''
3854 || (*input_line_pointer != 'A'
3855 && *input_line_pointer != 'E')))
3856 TC_PARSE_CONS_EXPRESSION (exp, nbytes);
3860 unsigned int result = 0;
3862 /* An MRI style string. Cut into as many bytes as will fit into
3863 a nbyte chunk, left justify if necessary, and separate with
3864 commas so we can try again later. */
3865 if (*input_line_pointer == 'A')
3866 ++input_line_pointer;
3867 else if (*input_line_pointer == 'E')
3869 as_bad (_("EBCDIC constants are not supported"));
3870 ++input_line_pointer;
3873 input_line_pointer++;
3874 for (scan = 0; scan < nbytes; scan++)
3876 if (*input_line_pointer == '\'')
3878 if (input_line_pointer[1] == '\'')
3880 input_line_pointer++;
3885 result = (result << 8) | (*input_line_pointer++);
3889 while (scan < nbytes)
3895 /* Create correct expression. */
3896 exp->X_op = O_constant;
3897 exp->X_add_number = result;
3899 /* Fake it so that we can read the next char too. */
3900 if (input_line_pointer[0] != '\'' ||
3901 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
3903 input_line_pointer -= 2;
3904 input_line_pointer[0] = ',';
3905 input_line_pointer[1] = '\'';
3908 input_line_pointer++;
3911 #endif /* TC_M68K */
3913 #ifdef REPEAT_CONS_EXPRESSIONS
3915 /* Parse a repeat expression for cons. This is used by the MIPS
3916 assembler. The format is NUMBER:COUNT; NUMBER appears in the
3917 object file COUNT times.
3919 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
3922 parse_repeat_cons (exp, nbytes)
3924 unsigned int nbytes;
3931 if (*input_line_pointer != ':')
3933 /* No repeat count. */
3937 ++input_line_pointer;
3938 expression (&count);
3939 if (count.X_op != O_constant
3940 || count.X_add_number <= 0)
3942 as_warn (_("unresolvable or nonpositive repeat count; using 1"));
3946 /* The cons function is going to output this expression once. So we
3947 output it count - 1 times. */
3948 for (i = count.X_add_number - 1; i > 0; i--)
3949 emit_expr (exp, nbytes);
3952 #endif /* REPEAT_CONS_EXPRESSIONS */
3954 /* Parse a floating point number represented as a hex constant. This
3955 permits users to specify the exact bits they want in the floating
3959 hex_float (int float_type, char *bytes)
3991 as_bad (_("unknown floating type type '%c'"), float_type);
3995 /* It would be nice if we could go through expression to parse the
3996 hex constant, but if we get a bignum it's a pain to sort it into
3997 the buffer correctly. */
3999 while (hex_p (*input_line_pointer) || *input_line_pointer == '_')
4003 /* The MRI assembler accepts arbitrary underscores strewn about
4004 through the hex constant, so we ignore them as well. */
4005 if (*input_line_pointer == '_')
4007 ++input_line_pointer;
4013 as_warn (_("floating point constant too large"));
4016 d = hex_value (*input_line_pointer) << 4;
4017 ++input_line_pointer;
4018 while (*input_line_pointer == '_')
4019 ++input_line_pointer;
4020 if (hex_p (*input_line_pointer))
4022 d += hex_value (*input_line_pointer);
4023 ++input_line_pointer;
4025 if (target_big_endian)
4028 bytes[length - i - 1] = d;
4034 if (target_big_endian)
4035 memset (bytes + i, 0, length - i);
4037 memset (bytes, 0, length - i);
4045 CONStruct some more frag chars of .floats .ffloats etc.
4046 Makes 0 or more new frags.
4047 If need_pass_2 == 1, no frags are emitted.
4048 This understands only floating literals, not expressions. Sorry.
4050 A floating constant is defined by atof_generic(), except it is preceded
4051 by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
4052 reading, I decided to be incompatible. This always tries to give you
4053 rounded bits to the precision of the pseudo-op. Former AS did premature
4054 truncation, restored noisy bits instead of trailing 0s AND gave you
4055 a choice of 2 flavours of noise according to which of 2 floating-point
4056 scanners you directed AS to use.
4058 In: input_line_pointer->whitespace before, or '0' of flonum. */
4061 float_cons (/* Clobbers input_line-pointer, checks end-of-line. */
4062 register int float_type /* 'f':.ffloat ... 'F':.float ... */)
4065 int length; /* Number of chars in an object. */
4066 register char *err; /* Error from scanning floating literal. */
4067 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
4069 if (is_it_end_of_statement ())
4071 demand_empty_rest_of_line ();
4075 #ifdef md_flush_pending_output
4076 md_flush_pending_output ();
4081 /* input_line_pointer->1st char of a flonum (we hope!). */
4084 /* Skip any 0{letter} that may be present. Don't even check if the
4085 letter is legal. Someone may invent a "z" format and this routine
4086 has no use for such information. Lusers beware: you get
4087 diagnostics if your input is ill-conditioned. */
4088 if (input_line_pointer[0] == '0'
4089 && ISALPHA (input_line_pointer[1]))
4090 input_line_pointer += 2;
4092 /* Accept :xxxx, where the x's are hex digits, for a floating
4093 point with the exact digits specified. */
4094 if (input_line_pointer[0] == ':')
4096 ++input_line_pointer;
4097 length = hex_float (float_type, temp);
4100 ignore_rest_of_line ();
4106 err = md_atof (float_type, temp, &length);
4107 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
4111 as_bad (_("bad floating literal: %s"), err);
4112 ignore_rest_of_line ();
4123 #ifdef REPEAT_CONS_EXPRESSIONS
4124 if (*input_line_pointer == ':')
4126 expressionS count_exp;
4128 ++input_line_pointer;
4129 expression (&count_exp);
4131 if (count_exp.X_op != O_constant
4132 || count_exp.X_add_number <= 0)
4133 as_warn (_("unresolvable or nonpositive repeat count; using 1"));
4135 count = count_exp.X_add_number;
4139 while (--count >= 0)
4141 p = frag_more (length);
4142 memcpy (p, temp, (unsigned int) length);
4147 while (*input_line_pointer++ == ',');
4149 /* Put terminator back into stream. */
4150 --input_line_pointer;
4151 demand_empty_rest_of_line ();
4154 /* Return the size of a LEB128 value. */
4157 sizeof_sleb128 (offsetT value)
4159 register int size = 0;
4160 register unsigned byte;
4164 byte = (value & 0x7f);
4165 /* Sadly, we cannot rely on typical arithmetic right shift behaviour.
4166 Fortunately, we can structure things so that the extra work reduces
4167 to a noop on systems that do things "properly". */
4168 value = (value >> 7) | ~(-(offsetT)1 >> 7);
4171 while (!(((value == 0) && ((byte & 0x40) == 0))
4172 || ((value == -1) && ((byte & 0x40) != 0))));
4178 sizeof_uleb128 (valueT value)
4180 register int size = 0;
4181 register unsigned byte;
4185 byte = (value & 0x7f);
4195 sizeof_leb128 (valueT value, int sign)
4198 return sizeof_sleb128 ((offsetT) value);
4200 return sizeof_uleb128 (value);
4203 /* Output a LEB128 value. */
4206 output_sleb128 (char *p, offsetT value)
4208 register char *orig = p;
4213 unsigned byte = (value & 0x7f);
4215 /* Sadly, we cannot rely on typical arithmetic right shift behaviour.
4216 Fortunately, we can structure things so that the extra work reduces
4217 to a noop on systems that do things "properly". */
4218 value = (value >> 7) | ~(-(offsetT)1 >> 7);
4220 more = !((((value == 0) && ((byte & 0x40) == 0))
4221 || ((value == -1) && ((byte & 0x40) != 0))));
4233 output_uleb128 (char *p, valueT value)
4239 unsigned byte = (value & 0x7f);
4242 /* More bytes to follow. */
4253 output_leb128 (char *p, valueT value, int sign)
4256 return output_sleb128 (p, (offsetT) value);
4258 return output_uleb128 (p, value);
4261 /* Do the same for bignums. We combine sizeof with output here in that
4262 we don't output for NULL values of P. It isn't really as critical as
4263 for "normal" values that this be streamlined. */
4266 output_big_sleb128 (char *p, LITTLENUM_TYPE *bignum, int size)
4273 /* Strip leading sign extensions off the bignum. */
4274 while (size > 0 && bignum[size - 1] == (LITTLENUM_TYPE) -1)
4279 if (loaded < 7 && size > 0)
4281 val |= (*bignum << loaded);
4282 loaded += 8 * CHARS_PER_LITTLENUM;
4293 if ((val == 0 && (byte & 0x40) == 0)
4294 || (~(val | ~(((valueT) 1 << loaded) - 1)) == 0
4295 && (byte & 0x40) != 0))
4303 while (byte & 0x80);
4309 output_big_uleb128 (char *p, LITTLENUM_TYPE *bignum, int size)
4316 /* Strip leading zeros off the bignum. */
4317 /* XXX: Is this needed? */
4318 while (size > 0 && bignum[size - 1] == 0)
4323 if (loaded < 7 && size > 0)
4325 val |= (*bignum << loaded);
4326 loaded += 8 * CHARS_PER_LITTLENUM;
4335 if (size > 0 || val)
4342 while (byte & 0x80);
4348 output_big_leb128 (char *p, LITTLENUM_TYPE *bignum, int size, int sign)
4351 return output_big_sleb128 (p, bignum, size);
4353 return output_big_uleb128 (p, bignum, size);
4356 /* Generate the appropriate fragments for a given expression to emit a
4360 emit_leb128_expr (expressionS *exp, int sign)
4362 operatorT op = exp->X_op;
4365 if (op == O_absent || op == O_illegal)
4367 as_warn (_("zero assumed for missing expression"));
4368 exp->X_add_number = 0;
4371 else if (op == O_big && exp->X_add_number <= 0)
4373 as_bad (_("floating point number invalid"));
4374 exp->X_add_number = 0;
4377 else if (op == O_register)
4379 as_warn (_("register value used as expression"));
4383 /* Let check_eh_frame know that data is being emitted. nbytes == -1 is
4384 a signal that this is leb128 data. It shouldn't optimize this away. */
4386 if (check_eh_frame (exp, &nbytes))
4389 /* Let the backend know that subsequent data may be byte aligned. */
4390 #ifdef md_cons_align
4394 if (op == O_constant)
4396 /* If we've got a constant, emit the thing directly right now. */
4398 valueT value = exp->X_add_number;
4402 size = sizeof_leb128 (value, sign);
4403 p = frag_more (size);
4404 output_leb128 (p, value, sign);
4406 else if (op == O_big)
4408 /* O_big is a different sort of constant. */
4413 size = output_big_leb128 (NULL, generic_bignum, exp->X_add_number, sign);
4414 p = frag_more (size);
4415 output_big_leb128 (p, generic_bignum, exp->X_add_number, sign);
4419 /* Otherwise, we have to create a variable sized fragment and
4420 resolve things later. */
4422 frag_var (rs_leb128, sizeof_uleb128 (~(valueT) 0), 0, sign,
4423 make_expr_symbol (exp), 0, (char *) NULL);
4427 /* Parse the .sleb128 and .uleb128 pseudos. */
4434 #ifdef md_flush_pending_output
4435 md_flush_pending_output ();
4441 emit_leb128_expr (&exp, sign);
4443 while (*input_line_pointer++ == ',');
4445 input_line_pointer--;
4446 demand_empty_rest_of_line ();
4449 /* We read 0 or more ',' separated, double-quoted strings.
4450 Caller should have checked need_pass_2 is FALSE because we don't
4454 stringer (/* Worker to do .ascii etc statements. */
4455 /* Checks end-of-line. */
4456 register int append_zero /* 0: don't append '\0', else 1. */)
4458 register unsigned int c;
4461 #ifdef md_flush_pending_output
4462 md_flush_pending_output ();
4465 /* The following awkward logic is to parse ZERO or more strings,
4466 comma separated. Recall a string expression includes spaces
4467 before the opening '\"' and spaces after the closing '\"'.
4468 We fake a leading ',' if there is (supposed to be)
4469 a 1st, expression. We keep demanding expressions for each ','. */
4470 if (is_it_end_of_statement ())
4472 c = 0; /* Skip loop. */
4473 ++input_line_pointer; /* Compensate for end of loop. */
4477 c = ','; /* Do loop. */
4479 /* If we have been switched into the abs_section then we
4480 will not have an obstack onto which we can hang strings. */
4481 if (now_seg == absolute_section)
4483 as_bad (_("strings must be placed into a section"));
4485 ignore_rest_of_line ();
4488 while (c == ',' || c == '<' || c == '"')
4491 switch (*input_line_pointer)
4494 ++input_line_pointer; /*->1st char of string. */
4495 start = input_line_pointer;
4496 while (is_a_char (c = next_char_of_string ()))
4498 FRAG_APPEND_1_CHAR (c);
4502 FRAG_APPEND_1_CHAR (0);
4504 know (input_line_pointer[-1] == '\"');
4508 /* In ELF, when gcc is emitting DWARF 1 debugging output, it
4509 will emit .string with a filename in the .debug section
4510 after a sequence of constants. See the comment in
4511 emit_expr for the sequence. emit_expr will set
4512 dwarf_file_string to non-zero if this string might be a
4513 source file name. */
4514 if (strcmp (segment_name (now_seg), ".debug") != 0)
4515 dwarf_file_string = 0;
4516 else if (dwarf_file_string)
4518 c = input_line_pointer[-1];
4519 input_line_pointer[-1] = '\0';
4520 listing_source_file (start);
4521 input_line_pointer[-1] = c;
4528 input_line_pointer++;
4529 c = get_single_number ();
4530 FRAG_APPEND_1_CHAR (c);
4531 if (*input_line_pointer != '>')
4533 as_bad (_("expected <nn>"));
4535 input_line_pointer++;
4538 input_line_pointer++;
4542 c = *input_line_pointer;
4545 demand_empty_rest_of_line ();
4548 /* FIXME-SOMEDAY: I had trouble here on characters with the
4549 high bits set. We'll probably also have trouble with
4550 multibyte chars, wide chars, etc. Also be careful about
4551 returning values bigger than 1 byte. xoxorich. */
4554 next_char_of_string (void)
4556 register unsigned int c;
4558 c = *input_line_pointer++ & CHAR_MASK;
4566 as_warn (_("unterminated string; newline inserted"));
4567 bump_line_counters ();
4570 #ifndef NO_STRING_ESCAPES
4572 switch (c = *input_line_pointer++)
4600 break; /* As itself. */
4616 for (i = 0, number = 0;
4617 ISDIGIT (c) && i < 3;
4618 c = *input_line_pointer++, i++)
4620 number = number * 8 + c - '0';
4625 --input_line_pointer;
4634 c = *input_line_pointer++;
4635 while (ISXDIGIT (c))
4638 number = number * 16 + c - '0';
4639 else if (ISUPPER (c))
4640 number = number * 16 + c - 'A' + 10;
4642 number = number * 16 + c - 'a' + 10;
4643 c = *input_line_pointer++;
4646 --input_line_pointer;
4651 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
4652 as_warn (_("unterminated string; newline inserted"));
4654 bump_line_counters ();
4659 #ifdef ONLY_STANDARD_ESCAPES
4660 as_bad (_("bad escaped character in string"));
4662 #endif /* ONLY_STANDARD_ESCAPES */
4667 #endif /* ! defined (NO_STRING_ESCAPES) */
4676 get_segmented_expression (register expressionS *expP)
4678 register segT retval;
4680 retval = expression (expP);
4681 if (expP->X_op == O_illegal
4682 || expP->X_op == O_absent
4683 || expP->X_op == O_big)
4685 as_bad (_("expected address expression"));
4686 expP->X_op = O_constant;
4687 expP->X_add_number = 0;
4688 retval = absolute_section;
4694 get_known_segmented_expression (register expressionS *expP)
4696 register segT retval;
4698 if ((retval = get_segmented_expression (expP)) == undefined_section)
4700 /* There is no easy way to extract the undefined symbol from the
4702 if (expP->X_add_symbol != NULL
4703 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
4704 as_warn (_("symbol \"%s\" undefined; zero assumed"),
4705 S_GET_NAME (expP->X_add_symbol));
4707 as_warn (_("some symbol undefined; zero assumed"));
4708 retval = absolute_section;
4709 expP->X_op = O_constant;
4710 expP->X_add_number = 0;
4712 know (retval == absolute_section || SEG_NORMAL (retval));
4717 get_absolute_expr (expressionS *exp)
4720 if (exp->X_op != O_constant)
4722 if (exp->X_op != O_absent)
4723 as_bad (_("bad or irreducible absolute expression"));
4724 exp->X_add_number = 0;
4726 return exp->X_add_number;
4730 get_absolute_expression (void)
4734 return get_absolute_expr (&exp);
4737 char /* Return terminator. */
4738 get_absolute_expression_and_terminator (long *val_pointer /* Return value of expression. */)
4740 /* FIXME: val_pointer should probably be offsetT *. */
4741 *val_pointer = (long) get_absolute_expression ();
4742 return (*input_line_pointer++);
4745 /* Like demand_copy_string, but return NULL if the string contains any '\0's.
4746 Give a warning if that happens. */
4749 demand_copy_C_string (int *len_pointer)
4753 if ((s = demand_copy_string (len_pointer)) != 0)
4757 for (len = *len_pointer; len > 0; len--)
4764 as_bad (_("this string may not contain \'\\0\'"));
4772 /* Demand string, but return a safe (=private) copy of the string.
4773 Return NULL if we can't read a string here. */
4776 demand_copy_string (int *lenP)
4778 register unsigned int c;
4784 if (*input_line_pointer == '\"')
4786 input_line_pointer++; /* Skip opening quote. */
4788 while (is_a_char (c = next_char_of_string ()))
4790 obstack_1grow (¬es, c);
4793 /* JF this next line is so demand_copy_C_string will return a
4794 null terminated string. */
4795 obstack_1grow (¬es, '\0');
4796 retval = obstack_finish (¬es);
4800 as_bad (_("missing string"));
4802 ignore_rest_of_line ();
4808 /* In: Input_line_pointer->next character.
4810 Do: Skip input_line_pointer over all whitespace.
4812 Out: 1 if input_line_pointer->end-of-line. */
4815 is_it_end_of_statement (void)
4818 return (is_end_of_line[(unsigned char) *input_line_pointer]);
4822 equals (char *sym_name, int reassign)
4824 register symbolS *symbolP; /* Symbol we are working with. */
4828 input_line_pointer++;
4829 if (*input_line_pointer == '=')
4830 input_line_pointer++;
4832 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
4833 input_line_pointer++;
4836 stop = mri_comment_field (&stopc);
4838 if (sym_name[0] == '.' && sym_name[1] == '\0')
4840 /* Turn '. = mumble' into a .org mumble. */
4841 register segT segment;
4844 segment = get_known_segmented_expression (&exp);
4846 do_org (segment, &exp, 0);
4853 symbolP = symbol_find (sym_name);
4854 local = symbolP == NULL;
4856 #endif /* OBJ_COFF */
4857 symbolP = symbol_find_or_make (sym_name);
4858 /* Permit register names to be redefined. */
4860 && S_IS_DEFINED (symbolP)
4861 && S_GET_SEGMENT (symbolP) != reg_section)
4862 as_bad (_("symbol `%s' is already defined"), S_GET_NAME (symbolP));
4865 /* "set" symbols are local unless otherwise specified. */
4867 SF_SET_LOCAL (symbolP);
4868 #endif /* OBJ_COFF */
4870 pseudo_set (symbolP);
4875 /* Check garbage after the expression. */
4876 demand_empty_rest_of_line ();
4877 mri_comment_end (stop, stopc);
4881 /* .incbin -- include a file verbatim at the current location. */
4884 s_incbin (int x ATTRIBUTE_UNUSED)
4895 #ifdef md_flush_pending_output
4896 md_flush_pending_output ();
4900 filename = demand_copy_string (& len);
4901 if (filename == NULL)
4906 /* Look for optional skip and count. */
4907 if (* input_line_pointer == ',')
4909 ++ input_line_pointer;
4910 skip = get_absolute_expression ();
4914 if (* input_line_pointer == ',')
4916 ++ input_line_pointer;
4918 count = get_absolute_expression ();
4920 as_warn (_(".incbin count zero, ignoring `%s'"), filename);
4926 demand_empty_rest_of_line ();
4928 /* Try opening absolute path first, then try include dirs. */
4929 binfile = fopen (filename, FOPEN_RB);
4930 if (binfile == NULL)
4934 path = xmalloc ((unsigned long) len + include_dir_maxlen + 5);
4936 for (i = 0; i < include_dir_count; i++)
4938 sprintf (path, "%s/%s", include_dirs[i], filename);
4940 binfile = fopen (path, FOPEN_RB);
4941 if (binfile != NULL)
4945 if (binfile == NULL)
4946 as_bad (_("file not found: %s"), filename);
4949 path = xstrdup (filename);
4955 register_dependency (path);
4957 /* Compute the length of the file. */
4958 if (fseek (binfile, 0, SEEK_END) != 0)
4960 as_bad (_("seek to end of .incbin file failed `%s'"), path);
4963 file_len = ftell (binfile);
4965 /* If a count was not specified use the size of the file. */
4969 if (skip + count > file_len)
4971 as_bad (_("skip (%ld) + count (%ld) larger than file size (%ld)"),
4972 skip, count, file_len);
4976 if (fseek (binfile, skip, SEEK_SET) != 0)
4978 as_bad (_("could not skip to %ld in file `%s'"), skip, path);
4982 /* Allocate frag space and store file contents in it. */
4983 binfrag = frag_more (count);
4985 bytes = fread (binfrag, 1, count, binfile);
4987 as_warn (_("truncated file `%s', %ld of %ld bytes read"),
4988 path, bytes, count);
4991 if (binfile != NULL)
4997 /* .include -- include a file at this point. */
5000 s_include (int arg ATTRIBUTE_UNUSED)
5009 filename = demand_copy_string (&i);
5010 if (filename == NULL)
5012 /* demand_copy_string has already printed an error and
5013 called ignore_rest_of_line. */
5021 while (!is_end_of_line[(unsigned char) *input_line_pointer]
5022 && *input_line_pointer != ' '
5023 && *input_line_pointer != '\t')
5025 obstack_1grow (¬es, *input_line_pointer);
5026 ++input_line_pointer;
5030 obstack_1grow (¬es, '\0');
5031 filename = obstack_finish (¬es);
5032 while (!is_end_of_line[(unsigned char) *input_line_pointer])
5033 ++input_line_pointer;
5036 demand_empty_rest_of_line ();
5037 path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
5039 for (i = 0; i < include_dir_count; i++)
5041 strcpy (path, include_dirs[i]);
5043 strcat (path, filename);
5044 if (0 != (try = fopen (path, FOPEN_RT)))
5054 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
5055 register_dependency (path);
5056 input_scrub_insert_file (path);
5060 add_include_dir (char *path)
5064 if (include_dir_count == 0)
5066 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
5067 include_dirs[0] = "."; /* Current dir. */
5068 include_dir_count = 2;
5072 include_dir_count++;
5074 (char **) realloc (include_dirs,
5075 include_dir_count * sizeof (*include_dirs));
5078 include_dirs[include_dir_count - 1] = path; /* New one. */
5081 if (i > include_dir_maxlen)
5082 include_dir_maxlen = i;
5085 /* Output debugging information to denote the source file. */
5088 generate_file_debug (void)
5090 if (debug_type == DEBUG_STABS)
5091 stabs_generate_asm_file ();
5094 /* Output line number debugging information for the current source line. */
5097 generate_lineno_debug (void)
5101 case DEBUG_UNSPECIFIED:
5106 stabs_generate_asm_lineno ();
5109 ecoff_generate_asm_lineno ();
5112 /* ??? We could here indicate to dwarf2dbg.c that something
5113 has changed. However, since there is additional backend
5114 support that is required (calling dwarf2_emit_insn), we
5115 let dwarf2dbg.c call as_where on its own. */
5120 /* Output debugging information to mark a function entry point or end point.
5121 END_P is zero for .func, and non-zero for .endfunc. */
5126 do_s_func (end_p, NULL);
5129 /* Subroutine of s_func so targets can choose a different default prefix.
5130 If DEFAULT_PREFIX is NULL, use the target's "leading char". */
5133 do_s_func (int end_p, const char *default_prefix)
5135 /* Record the current function so that we can issue an error message for
5136 misplaced .func,.endfunc, and also so that .endfunc needs no
5138 static char *current_name;
5139 static char *current_label;
5143 if (current_name == NULL)
5145 as_bad (_("missing .func"));
5146 ignore_rest_of_line ();
5150 if (debug_type == DEBUG_STABS)
5151 stabs_generate_asm_endfunc (current_name, current_label);
5153 current_name = current_label = NULL;
5158 char delim1, delim2;
5160 if (current_name != NULL)
5162 as_bad (_(".endfunc missing for previous .func"));
5163 ignore_rest_of_line ();
5167 name = input_line_pointer;
5168 delim1 = get_symbol_end ();
5169 name = xstrdup (name);
5170 *input_line_pointer = delim1;
5172 if (*input_line_pointer != ',')
5175 asprintf (&label, "%s%s", default_prefix, name);
5178 char leading_char = 0;
5179 #ifdef BFD_ASSEMBLER
5180 leading_char = bfd_get_symbol_leading_char (stdoutput);
5182 /* Missing entry point, use function's name with the leading
5185 asprintf (&label, "%c%s", leading_char, name);
5192 ++input_line_pointer;
5194 label = input_line_pointer;
5195 delim2 = get_symbol_end ();
5196 label = xstrdup (label);
5197 *input_line_pointer = delim2;
5200 if (debug_type == DEBUG_STABS)
5201 stabs_generate_asm_func (name, label);
5203 current_name = name;
5204 current_label = label;
5207 demand_empty_rest_of_line ();
5211 s_ignore (int arg ATTRIBUTE_UNUSED)
5213 while (!is_end_of_line[(unsigned char) *input_line_pointer])
5215 ++input_line_pointer;
5217 ++input_line_pointer;
5221 read_print_statistics (FILE *file)
5223 hash_print_statistics (file, "pseudo-op table", po_hash);
5226 /* Inserts the given line into the input stream.
5228 This call avoids macro/conditionals nesting checking, since the contents of
5229 the line are assumed to replace the contents of a line already scanned.
5231 An appropriate use of this function would be substitution of input lines when
5232 called by md_start_line_hook(). The given line is assumed to already be
5233 properly scrubbed. */
5236 input_scrub_insert_line (const char *line)
5240 sb_add_string (&newline, line);
5241 input_scrub_include_sb (&newline, input_line_pointer, 0);
5243 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
5246 /* Insert a file into the input stream; the path must resolve to an actual
5247 file; no include path searching or dependency registering is performed. */
5250 input_scrub_insert_file (char *path)
5252 input_scrub_include_file (path, input_line_pointer);
5253 buffer_limit = input_scrub_next_buffer (&input_line_pointer);