1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991, 1993 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
22 change this a bit. But then, GNU isn't
23 spozed to run on your machine anyway.
24 (RMS is so shortsighted sometimes.)
27 #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. */
34 #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
36 /* Routines that read assembler source text to build spagetti in memory.
37 Another group of these functions is in the expr.c module. */
48 /* We need this, despite the apparent object format dependency, since
49 it defines stab types, which all object formats can use now. */
51 #include "aout/stab_gnu.h"
53 /* Allow backends to override the names used for the stab sections. */
54 #ifndef STAB_SECTION_NAME
55 #define STAB_SECTION_NAME ".stab"
58 #ifndef STAB_STRING_SECTION_NAME
59 #define STAB_STRING_SECTION_NAME ".stabstr"
62 #ifndef TC_START_LABEL
63 #define TC_START_LABEL(x,y) (x==':')
66 /* The NOP_OPCODE is for the alignment fill value.
67 * fill it a nop instruction so that the disassembler does not choke
71 #define NOP_OPCODE 0x00
74 char *input_line_pointer; /*->next char of source file to parse. */
76 #if BITS_PER_CHAR != 8
77 /* The following table is indexed by[(char)] and will break if
78 a char does not have exactly 256 states (hopefully 0:255!)! */
83 /* The m88k unfortunately uses @ as a label beginner. */
87 /* used by is_... macros. our ctype[] */
88 const char lex_type[256] =
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
91 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
92 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
93 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
94 LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
95 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
96 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
97 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
98 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
99 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
100 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
101 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
102 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
103 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
104 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
110 * Out: 1 if this character ends a line.
113 char is_end_of_line[256] =
116 _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
118 _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
120 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
122 _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
123 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
125 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
126 _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
128 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
129 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
130 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
131 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
132 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
133 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
134 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
135 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
136 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
140 /* Functions private to this file. */
142 static char *buffer; /* 1st char of each buffer of lines is here. */
143 static char *buffer_limit; /*->1 + last char in buffer. */
145 int target_big_endian;
147 static char *old_buffer; /* JF a hack */
148 static char *old_input;
149 static char *old_limit;
151 /* Variables for handling include file directory list. */
153 char **include_dirs; /* List of pointers to directories to
154 search for .include's */
155 int include_dir_count; /* How many are in the list */
156 int include_dir_maxlen = 1;/* Length of longest in list */
158 #ifndef WORKING_DOT_WORD
159 struct broken_word *broken_words;
160 int new_broken_words;
163 static char *demand_copy_string PARAMS ((int *lenP));
164 int is_it_end_of_statement PARAMS ((void));
165 static segT get_segmented_expression PARAMS ((expressionS *expP));
166 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
167 static void pobegin PARAMS ((void));
176 obj_read_begin_hook ();
178 /* Something close -- but not too close -- to a multiple of 1024.
179 The debugging malloc I'm using has 24 bytes of overhead. */
180 obstack_begin (¬es, 5090);
181 obstack_begin (&cond_obstack, 990);
183 /* Use machine dependent syntax */
184 for (p = line_separator_chars; *p; p++)
185 is_end_of_line[(unsigned char) *p] = 1;
186 /* Use more. FIXME-SOMEDAY. */
189 /* set up pseudo-op tables */
191 struct hash_control *po_hash;
193 static const pseudo_typeS potable[] =
195 {"abort", s_abort, 0},
196 {"align", s_align_ptwo, 0},
197 {"ascii", stringer, 0},
198 {"asciz", stringer, 1},
207 {"double", float_cons, 'd'},
209 {"eject", listing_eject, 0}, /* Formfeed listing */
212 {"endif", s_endif, 0},
217 {"extern", s_ignore, 0}, /* We treat all undef as ext */
218 {"appfile", s_app_file, 1},
219 {"appline", s_app_line, 0},
220 {"file", s_app_file, 0},
222 {"float", float_cons, 'f'},
223 {"global", s_globl, 0},
224 {"globl", s_globl, 0},
227 {"ifdef", s_ifdef, 0},
228 {"ifeqs", s_ifeqs, 0},
229 {"ifndef", s_ifdef, 1},
230 {"ifnes", s_ifeqs, 1},
231 {"ifnotdef", s_ifdef, 1},
232 {"include", s_include, 0},
234 {"lcomm", s_lcomm, 0},
235 {"lflags", listing_flags, 0}, /* Listing flags */
236 {"list", listing_list, 1}, /* Turn listing on */
239 {"nolist", listing_list, 0}, /* Turn listing off */
242 {"psize", listing_psize, 0}, /* set paper size */
245 {"sbttl", listing_title, 1}, /* Subtitle of listing */
250 {"single", float_cons, 'f'},
252 {"space", s_space, 0},
253 {"stabd", s_stab, 'd'},
254 {"stabn", s_stab, 'n'},
255 {"stabs", s_stab, 's'},
256 {"string", stringer, 1},
259 {"title", listing_title, 0}, /* Listing title */
263 {"xstabs", s_xstab, 's'},
265 {NULL} /* end sentinel */
271 const char *errtxt; /* error text */
272 const pseudo_typeS *pop;
274 po_hash = hash_new ();
276 /* Do the target-specific pseudo ops. */
277 for (pop = md_pseudo_table; pop->poc_name; pop++)
279 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
282 as_fatal ("error constructing md pseudo-op table");
286 /* Now object specific. Skip any that were in the target table. */
287 for (pop = obj_pseudo_table; pop->poc_name; pop++)
289 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
292 if (!strcmp (errtxt, "exists"))
294 #ifdef DIE_ON_OVERRIDES
295 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
296 #endif /* DIE_ON_OVERRIDES */
297 continue; /* OK if target table overrides. */
301 as_fatal ("error constructing obj pseudo-op table");
302 } /* if overridden */
306 /* Now portable ones. Skip any that we've seen already. */
307 for (pop = potable; pop->poc_name; pop++)
309 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
312 if (!strcmp (errtxt, "exists"))
314 #ifdef DIE_ON_OVERRIDES
315 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
316 #endif /* DIE_ON_OVERRIDES */
317 continue; /* OK if target table overrides. */
321 as_fatal ("error constructing obj pseudo-op table");
322 } /* if overridden */
329 #define HANDLE_CONDITIONAL_ASSEMBLY() \
330 if (ignore_input ()) \
332 while (! is_end_of_line[(unsigned char) *input_line_pointer++]) \
333 if (input_line_pointer == buffer_limit) \
339 /* read_a_source_file()
341 * We read the file, putting things into a web that
342 * represents what we have been reading.
345 read_a_source_file (name)
349 register char *s; /* string of symbol, '\0' appended */
353 buffer = input_scrub_new_file (name);
356 listing_newline ("");
358 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
359 { /* We have another line to parse. */
360 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
361 contin: /* JF this goto is my fault I admit it.
362 Someone brave please re-write the whole
363 input section here? Pleeze??? */
364 while (input_line_pointer < buffer_limit)
366 /* We have more of this buffer to parse. */
369 * We now have input_line_pointer->1st char of next line.
370 * If input_line_pointer [-1] == '\n' then we just
371 * scanned another line: so bump line counters.
373 if (input_line_pointer[-1] == '\n')
375 bump_line_counters ();
378 /* Text at the start of a line must be a label, we run down and stick a colon in */
379 if (is_name_beginner (*input_line_pointer))
381 char *line_start = input_line_pointer;
382 char c = get_symbol_end ();
384 *input_line_pointer = c;
386 input_line_pointer++;
394 * We are at the begining of a line, or similar place.
395 * We expect a well-formed assembler statement.
396 * A "symbol-name:" is a statement.
398 * Depending on what compiler is used, the order of these tests
399 * may vary to catch most common case 1st.
400 * Each test is independent of all other tests at the (top) level.
401 * PLEASE make a compiler that doesn't use this assembler.
402 * It is crufty to waste a compiler's time encoding things for this
403 * assembler, which then wastes more time decoding it.
404 * (And communicating via (linear) files is silly!
405 * If you must pass stuff, please pass a tree!)
407 if ((c = *input_line_pointer++) == '\t'
412 c = *input_line_pointer++;
414 know (c != ' '); /* No further leading whitespace. */
417 * C is the 1st significant character.
418 * Input_line_pointer points after that character.
420 if (is_name_beginner (c))
421 { /* want user-defined label or pseudo/opcode */
422 HANDLE_CONDITIONAL_ASSEMBLY ();
424 s = --input_line_pointer;
425 c = get_symbol_end (); /* name's delimiter */
427 * C is character after symbol.
428 * That character's place in the input line is now '\0'.
429 * S points to the beginning of the symbol.
430 * [In case of pseudo-op, s->'.'.]
431 * Input_line_pointer->'\0' where c was.
433 if (TC_START_LABEL(c, input_line_pointer))
435 colon (s); /* user-defined label */
436 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
437 /* Input_line_pointer->after ':'. */
443 || (input_line_pointer[1] == '='
444 #ifdef TC_EQUAL_IN_INSN
445 && ! TC_EQUAL_IN_INSN (c, input_line_pointer)
450 demand_empty_rest_of_line ();
453 { /* expect pseudo-op or machine instruction */
455 if (!done_pseudo (s))
461 #define IGNORE_OPCODE_CASE
462 #ifdef IGNORE_OPCODE_CASE
475 /* The m88k uses pseudo-ops without a period. */
476 pop = (pseudo_typeS *) hash_find (po_hash, s);
477 if (pop != NULL && pop->poc_handler == NULL)
481 if (pop != NULL || *s == '.')
486 * WARNING: c has next char, which may be end-of-line.
487 * We lookup the pseudo-op table with s+1 because we
488 * already know that the pseudo-op begins with a '.'.
492 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
494 /* Print the error msg now, while we still can */
497 as_bad ("Unknown pseudo-op: `%s'", s);
498 *input_line_pointer = c;
503 /* Put it back for error messages etc. */
504 *input_line_pointer = c;
505 /* The following skip of whitespace is compulsory.
506 A well shaped space is sometimes all that separates
507 keyword from operands. */
508 if (c == ' ' || c == '\t')
509 input_line_pointer++;
511 * Input_line is restored.
512 * Input_line_pointer->1st non-blank char
513 * after pseudo-operation.
515 (*pop->poc_handler) (pop->poc_val);
519 { /* machine instruction */
520 /* WARNING: c has char, which may be end-of-line. */
521 /* Also: input_line_pointer->`\0` where c was. */
522 *input_line_pointer = c;
523 while (!is_end_of_line[(unsigned char) *input_line_pointer]
524 #ifdef TC_EOL_IN_INSN
525 || TC_EOL_IN_INSN (input_line_pointer)
529 input_line_pointer++;
532 c = *input_line_pointer;
533 *input_line_pointer = '\0';
535 md_assemble (s); /* Assemble 1 instruction. */
537 *input_line_pointer++ = c;
539 /* We resume loop AFTER the end-of-line from
544 } /* if (is_name_beginner(c) */
547 /* Empty statement? */
548 if (is_end_of_line[(unsigned char) c])
551 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
554 /* local label ("4:") */
555 char *backup = input_line_pointer;
557 HANDLE_CONDITIONAL_ASSEMBLY ();
561 while (isdigit (*input_line_pointer))
563 temp = (temp * 10) + *input_line_pointer - '0';
564 ++input_line_pointer;
565 } /* read the whole number */
567 #ifdef LOCAL_LABELS_DOLLAR
568 if (*input_line_pointer == '$'
569 && *(input_line_pointer + 1) == ':')
571 input_line_pointer += 2;
573 if (dollar_label_defined (temp))
575 as_fatal ("label \"%d$\" redefined", temp);
578 define_dollar_label (temp);
579 colon (dollar_label_name (temp, 0));
582 #endif /* LOCAL_LABELS_DOLLAR */
584 #ifdef LOCAL_LABELS_FB
585 if (*input_line_pointer++ == ':')
587 fb_label_instance_inc (temp);
588 colon (fb_label_name (temp, 0));
591 #endif /* LOCAL_LABELS_FB */
593 input_line_pointer = backup;
594 } /* local label ("4:") */
595 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
597 if (c && strchr (line_comment_chars, c))
598 { /* Its a comment. Better say APP or NO_APP */
602 unsigned int new_length;
604 extern char *scrub_string, *scrub_last_string;
606 bump_line_counters ();
607 s = input_line_pointer;
608 if (strncmp (s, "APP\n", 4))
609 continue; /* We ignore it */
612 ends = strstr (s, "#NO_APP\n");
616 unsigned int tmp_len;
619 /* The end of the #APP wasn't in this buffer. We
620 keep reading in buffers until we find the #NO_APP
621 that goes with this #APP There is one. The specs
623 tmp_len = buffer_limit - s;
624 tmp_buf = xmalloc (tmp_len + 1);
625 memcpy (tmp_buf, s, tmp_len);
628 new_tmp = input_scrub_next_buffer (&buffer);
632 buffer_limit = new_tmp;
633 input_line_pointer = buffer;
634 ends = strstr (buffer, "#NO_APP\n");
638 num = buffer_limit - buffer;
640 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
641 memcpy (tmp_buf, buffer + tmp_len, num);
646 input_line_pointer = ends ? ends + 8 : NULL;
654 input_line_pointer = ends + 8;
656 new_buf = xmalloc (100);
661 scrub_last_string = ends;
666 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
670 if (new_tmp == new_buf + new_length)
672 new_buf = xrealloc (new_buf, new_length + 100);
673 new_tmp = new_buf + new_length;
681 old_input = input_line_pointer;
682 old_limit = buffer_limit;
684 input_line_pointer = new_buf;
685 buffer_limit = new_tmp;
689 HANDLE_CONDITIONAL_ASSEMBLY ();
691 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
692 input_line_pointer--; /* Report unknown char as ignored. */
693 ignore_rest_of_line ();
694 } /* while (input_line_pointer<buffer_limit) */
697 bump_line_counters ();
701 input_line_pointer = old_input;
702 buffer_limit = old_limit;
707 } /* while (more buffers to scan) */
708 input_scrub_close (); /* Close the input file */
710 } /* read_a_source_file() */
716 as_fatal (".abort detected. Abandoning ship.");
719 /* For machines where ".align 4" means align to a 4 byte boundary. */
724 register unsigned int temp;
725 register long temp_fill;
727 unsigned long max_alignment = 1 << 15;
729 if (is_end_of_line[(unsigned char) *input_line_pointer])
730 temp = arg; /* Default value from pseudo-op table */
732 temp = get_absolute_expression ();
734 if (temp > max_alignment)
736 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
740 * For the sparc, `.align (1<<n)' actually means `.align n'
741 * so we have to convert it.
745 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
749 as_bad ("Alignment not a power of 2");
752 if (*input_line_pointer == ',')
754 input_line_pointer++;
755 temp_fill = get_absolute_expression ();
757 else if (now_seg != data_section && now_seg != bss_section)
758 temp_fill = NOP_OPCODE;
761 /* Only make a frag if we HAVE to. . . */
762 if (temp && !need_pass_2)
763 frag_align ((int) temp, (int) temp_fill);
765 record_alignment (now_seg, (int) temp);
767 demand_empty_rest_of_line ();
768 } /* s_align_bytes() */
770 /* For machines where ".align 4" means align to 2**4 boundary. */
772 s_align_ptwo (ignore)
776 register long temp_fill;
777 long max_alignment = 15;
779 temp = get_absolute_expression ();
780 if (temp > max_alignment)
781 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
784 as_bad ("Alignment negative. 0 assumed.");
787 if (*input_line_pointer == ',')
789 input_line_pointer++;
790 temp_fill = get_absolute_expression ();
792 /* @@ Fix this right for BFD! */
793 else if (now_seg != data_section && now_seg != bss_section)
794 temp_fill = NOP_OPCODE;
797 /* Only make a frag if we HAVE to. . . */
798 if (temp && !need_pass_2)
799 frag_align (temp, (int) temp_fill);
801 record_alignment (now_seg, temp);
803 demand_empty_rest_of_line ();
804 } /* s_align_ptwo() */
814 register symbolS *symbolP;
816 name = input_line_pointer;
817 c = get_symbol_end ();
818 /* just after name is now '\0' */
819 p = input_line_pointer;
822 if (*input_line_pointer != ',')
824 as_bad ("Expected comma after symbol-name: rest of line ignored.");
825 ignore_rest_of_line ();
828 input_line_pointer++; /* skip ',' */
829 if ((temp = get_absolute_expression ()) < 0)
831 as_warn (".COMMon length (%ld.) <0! Ignored.", (long) temp);
832 ignore_rest_of_line ();
836 symbolP = symbol_find_or_make (name);
838 if (S_IS_DEFINED (symbolP))
840 as_bad ("Ignoring attempt to re-define symbol");
841 ignore_rest_of_line ();
844 if (S_GET_VALUE (symbolP))
846 if (S_GET_VALUE (symbolP) != (valueT) temp)
847 as_bad ("Length of .comm \"%s\" is already %ld. Not changed to %ld.",
848 S_GET_NAME (symbolP),
849 (long) S_GET_VALUE (symbolP),
854 S_SET_VALUE (symbolP, (valueT) temp);
855 S_SET_EXTERNAL (symbolP);
858 if ( (!temp) || !flagseen['1'])
859 S_GET_OTHER(symbolP) = const_flag;
860 #endif /* not OBJ_VMS */
861 know (symbolP->sy_frag == &zero_address_frag);
862 demand_empty_rest_of_line ();
872 temp = get_absolute_expression ();
875 section = text_section;
879 section = data_section;
881 subseg_set (section, (subsegT) temp);
886 demand_empty_rest_of_line ();
889 /* Handle the .appfile pseudo-op. This is automatically generated by
890 do_scrub_next_char when a preprocessor # line comment is seen with
891 a file name. This default definition may be overridden by the
892 object or CPU specific pseudo-ops. This function is also the
893 default definition for .file; the APPFILE argument is 1 for
894 .appfile, 0 for .file. */
903 /* Some assemblers tolerate immediately following '"' */
904 if ((s = demand_copy_string (&length)) != 0)
906 /* If this is a fake .appfile, a fake newline was inserted into
907 the buffer. Passing -2 to new_logical_line tells it to
909 new_logical_line (s, appfile ? -2 : -1);
910 demand_empty_rest_of_line ();
913 listing_source_file (s);
917 c_dot_file_symbol (s);
918 #endif /* OBJ_COFF */
924 /* Handle the .appline pseudo-op. This is automatically generated by
925 do_scrub_next_char when a preprocessor # line comment is seen.
926 This default definition may be overridden by the object or CPU
927 specific pseudo-ops. */
935 /* The given number is that of the next line. */
936 l = get_absolute_expression () - 1;
937 new_logical_line ((char *) NULL, l);
940 listing_source_line (l);
942 demand_empty_rest_of_line ();
949 long temp_repeat = 0;
951 register long temp_fill = 0;
955 temp_repeat = get_absolute_expression ();
956 if (*input_line_pointer == ',')
958 input_line_pointer++;
959 temp_size = get_absolute_expression ();
960 if (*input_line_pointer == ',')
962 input_line_pointer++;
963 temp_fill = get_absolute_expression ();
966 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
967 #define BSD_FILL_SIZE_CROCK_8 (8)
968 if (temp_size > BSD_FILL_SIZE_CROCK_8)
970 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
971 temp_size = BSD_FILL_SIZE_CROCK_8;
975 as_warn ("Size negative: .fill ignored.");
978 else if (temp_repeat <= 0)
980 as_warn ("Repeat < 0, .fill ignored");
984 if (temp_size && !need_pass_2)
986 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
987 memset (p, 0, (unsigned int) temp_size);
988 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
989 * flavoured AS. The following bizzare behaviour is to be
990 * compatible with above. I guess they tried to take up to 8
991 * bytes from a 4-byte expression and they forgot to sign
992 * extend. Un*x Sux. */
993 #define BSD_FILL_SIZE_CROCK_4 (4)
994 md_number_to_chars (p, (valueT) temp_fill,
995 (temp_size > BSD_FILL_SIZE_CROCK_4
996 ? BSD_FILL_SIZE_CROCK_4
998 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
999 * but emits no error message because it seems a legal thing to do.
1000 * It is a degenerate case of .fill but could be emitted by a compiler.
1003 demand_empty_rest_of_line ();
1016 name = input_line_pointer;
1017 c = get_symbol_end ();
1018 symbolP = symbol_find_or_make (name);
1019 *input_line_pointer = c;
1021 S_SET_EXTERNAL (symbolP);
1024 input_line_pointer++;
1026 if (*input_line_pointer == '\n')
1031 demand_empty_rest_of_line ();
1035 s_lcomm (needs_align)
1036 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1037 (alignment); 0 if it was an ".lcomm" (2 args only) */
1040 register char *name;
1044 register symbolS *symbolP;
1045 segT current_seg = now_seg;
1046 subsegT current_subseg = now_subseg;
1047 const int max_alignment = 15;
1049 segT bss_seg = bss_section;
1051 name = input_line_pointer;
1052 c = get_symbol_end ();
1053 p = input_line_pointer;
1057 /* Accept an optional comma after the name. The comma used to be
1058 required, but Irix 5 cc does not generate it. */
1059 if (*input_line_pointer == ',')
1061 ++input_line_pointer;
1065 if (*input_line_pointer == '\n')
1067 as_bad ("Missing size expression");
1071 if ((temp = get_absolute_expression ()) < 0)
1073 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1074 ignore_rest_of_line ();
1079 #if defined (OBJ_ECOFF) || defined (OBJ_ELF)
1080 /* For MIPS ECOFF or ELF, small objects are put in .sbss. */
1081 if (temp <= bfd_get_gp_size (stdoutput))
1083 bss_seg = subseg_new (".sbss", 1);
1084 seg_info (bss_seg)->bss = 1;
1093 if (*input_line_pointer != ',')
1095 as_bad ("Expected comma after size");
1096 ignore_rest_of_line ();
1099 input_line_pointer++;
1101 if (*input_line_pointer == '\n')
1103 as_bad ("Missing alignment");
1106 align = get_absolute_expression ();
1107 if (align > max_alignment)
1109 align = max_alignment;
1110 as_warn ("Alignment too large: %d. assumed.", align);
1115 as_warn ("Alignment negative. 0 assumed.");
1117 record_alignment (bss_seg, align);
1118 } /* if needs align */
1121 symbolP = symbol_find_or_make (name);
1125 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1126 S_GET_OTHER (symbolP) == 0 &&
1127 S_GET_DESC (symbolP) == 0 &&
1128 #endif /* OBJ_AOUT or OBJ_BOUT */
1129 (S_GET_SEGMENT (symbolP) == bss_seg
1130 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1134 subseg_set (bss_seg, 1);
1137 frag_align (align, 0);
1138 /* detach from old frag */
1139 if (S_GET_SEGMENT (symbolP) == bss_seg)
1140 symbolP->sy_frag->fr_symbol = NULL;
1142 symbolP->sy_frag = frag_now;
1143 pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1147 S_SET_SEGMENT (symbolP, bss_seg);
1150 /* The symbol may already have been created with a preceding
1151 ".globl" directive -- be careful not to step on storage class
1152 in that case. Otherwise, set it to static. */
1153 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1155 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1157 #endif /* OBJ_COFF */
1161 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1164 subseg_set (current_seg, current_subseg);
1166 demand_empty_rest_of_line ();
1173 register char *name;
1177 register symbolS *symbolP;
1179 /* we permit ANY defined expression: BSD4.2 demands constants */
1180 name = input_line_pointer;
1181 c = get_symbol_end ();
1182 p = input_line_pointer;
1185 if (*input_line_pointer != ',')
1188 as_bad ("Expected comma after name \"%s\"", name);
1190 ignore_rest_of_line ();
1193 input_line_pointer++;
1195 if (exp.X_op != O_constant
1196 && exp.X_op != O_register)
1198 as_bad ("bad expression");
1199 ignore_rest_of_line ();
1203 symbolP = symbol_find_or_make (name);
1205 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1206 symbolP->sy_desc == 0) out of this test because coff doesn't have
1207 those fields, and I can't see when they'd ever be tripped. I
1208 don't think I understand why they were here so I may have
1209 introduced a bug. As recently as 1.37 didn't have this test
1210 anyway. xoxorich. */
1212 if (S_GET_SEGMENT (symbolP) == undefined_section
1213 && S_GET_VALUE (symbolP) == 0)
1215 /* The name might be an undefined .global symbol; be sure to
1216 keep the "external" bit. */
1217 S_SET_SEGMENT (symbolP,
1218 (exp.X_op == O_constant
1221 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1225 as_bad ("Symbol %s already defined", name);
1228 demand_empty_rest_of_line ();
1235 register segT segment;
1237 register long temp_fill;
1239 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1240 thing as a sub-segment-relative origin. Any absolute origin is
1241 given a warning, then assumed to be segment-relative. Any
1242 segmented origin expression ("foo+42") had better be in the right
1243 segment or the .org is ignored.
1245 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1246 we never know sub-segment sizes when we are reading code. BSD
1247 will crash trying to emit negative numbers of filler bytes in
1248 certain .orgs. We don't crash, but see as-write for that code.
1250 Don't make frag if need_pass_2==1. */
1251 segment = get_known_segmented_expression (&exp);
1252 if (*input_line_pointer == ',')
1254 input_line_pointer++;
1255 temp_fill = get_absolute_expression ();
1261 if (segment != now_seg && segment != absolute_section)
1262 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1263 segment_name (segment), segment_name (now_seg));
1264 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1265 exp.X_add_number, (char *) 0);
1267 } /* if (ok to make frag) */
1268 demand_empty_rest_of_line ();
1275 register char *name;
1276 register char delim;
1277 register char *end_name;
1278 register symbolS *symbolP;
1281 * Especial apologies for the random logic:
1282 * this just grew, and could be parsed much more simply!
1285 name = input_line_pointer;
1286 delim = get_symbol_end ();
1287 end_name = input_line_pointer;
1291 if (*input_line_pointer != ',')
1294 as_bad ("Expected comma after name \"%s\"", name);
1296 ignore_rest_of_line ();
1300 input_line_pointer++;
1303 if (name[0] == '.' && name[1] == '\0')
1305 /* Turn '. = mumble' into a .org mumble */
1306 register segT segment;
1310 segment = get_known_segmented_expression (&exp);
1314 if (segment != now_seg && segment != absolute_section)
1315 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1316 segment_name (segment),
1317 segment_name (now_seg));
1318 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1319 exp.X_add_number, (char *) 0);
1321 } /* if (ok to make frag) */
1327 if ((symbolP = symbol_find (name)) == NULL
1328 && (symbolP = md_undefined_symbol (name)) == NULL)
1330 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1332 /* "set" symbols are local unless otherwise specified. */
1333 SF_SET_LOCAL (symbolP);
1334 #endif /* OBJ_COFF */
1336 } /* make a new symbol */
1338 symbol_table_insert (symbolP);
1341 pseudo_set (symbolP);
1342 demand_empty_rest_of_line ();
1350 register long temp_fill;
1353 /* Just like .fill, but temp_size = 1 */
1354 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1356 temp_fill = get_absolute_expression ();
1360 input_line_pointer--; /* Backup over what was not a ','. */
1365 temp_repeat *= mult;
1367 if (temp_repeat <= 0)
1369 as_warn ("Repeat < 0, .space ignored");
1370 ignore_rest_of_line ();
1375 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1376 temp_repeat, (char *) 0);
1379 demand_empty_rest_of_line ();
1388 temp = get_absolute_expression ();
1389 subseg_set (text_section, (subsegT) temp);
1390 demand_empty_rest_of_line ();
1395 demand_empty_rest_of_line ()
1398 if (is_end_of_line[(unsigned char) *input_line_pointer])
1400 input_line_pointer++;
1404 ignore_rest_of_line ();
1406 /* Return having already swallowed end-of-line. */
1407 } /* Return pointing just after end-of-line. */
1410 ignore_rest_of_line () /* For suspect lines: gives warning. */
1412 if (!is_end_of_line[(unsigned char) *input_line_pointer])
1414 if (isprint (*input_line_pointer))
1415 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1416 *input_line_pointer);
1418 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1419 *input_line_pointer);
1420 while (input_line_pointer < buffer_limit
1421 && !is_end_of_line[(unsigned char) *input_line_pointer])
1423 input_line_pointer++;
1426 input_line_pointer++; /* Return pointing just after end-of-line. */
1427 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
1433 * In: Pointer to a symbol.
1434 * Input_line_pointer->expression.
1436 * Out: Input_line_pointer->just after any whitespace after expression.
1437 * Tried to set symbol to value of expression.
1438 * Will change symbols type, value, and frag;
1441 pseudo_set (symbolP)
1445 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1447 #endif /* OBJ_AOUT or OBJ_BOUT */
1449 know (symbolP); /* NULL pointer is logic error. */
1450 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1451 /* @@ Fix this right for BFD. */
1452 ext = S_IS_EXTERNAL (symbolP);
1453 #endif /* OBJ_AOUT or OBJ_BOUT */
1455 (void) expression (&exp);
1457 if (exp.X_op == O_illegal)
1458 as_bad ("illegal expression; zero assumed");
1459 else if (exp.X_op == O_absent)
1460 as_bad ("missing expression; zero assumed");
1461 else if (exp.X_op == O_big)
1462 as_bad ("%s number invalid; zero assumed",
1463 exp.X_add_number > 0 ? "bignum" : "floating point");
1464 else if (exp.X_op == O_subtract
1465 && (S_GET_SEGMENT (exp.X_add_symbol)
1466 == S_GET_SEGMENT (exp.X_op_symbol))
1467 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
1468 && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
1470 exp.X_op = O_constant;
1471 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
1472 - S_GET_VALUE (exp.X_op_symbol));
1480 exp.X_add_number = 0;
1483 S_SET_SEGMENT (symbolP, absolute_section);
1484 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1485 /* @@ Fix this right for BFD. */
1487 S_SET_EXTERNAL (symbolP);
1489 S_CLEAR_EXTERNAL (symbolP);
1490 #endif /* OBJ_AOUT or OBJ_BOUT */
1491 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1492 symbolP->sy_frag = &zero_address_frag;
1496 S_SET_SEGMENT (symbolP, reg_section);
1497 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1498 symbolP->sy_frag = &zero_address_frag;
1502 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section)
1503 symbolP->sy_value = exp;
1506 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (exp.X_add_symbol));
1507 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1508 /* @@ Fix this right for BFD! */
1510 S_SET_EXTERNAL (symbolP);
1512 S_CLEAR_EXTERNAL (symbolP);
1513 #endif /* OBJ_AOUT or OBJ_BOUT */
1514 S_SET_VALUE (symbolP,
1515 exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1516 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1521 /* The value is some complex expression.
1522 FIXME: Should we set the segment to anything? */
1523 symbolP->sy_value = exp;
1531 * CONStruct more frag of .bytes, or .words etc.
1532 * Should need_pass_2 be 1 then emit no frag(s).
1533 * This understands EXPRESSIONS.
1537 * This has a split personality. We use expression() to read the
1538 * value. We can detect if the value won't fit in a byte or word.
1539 * But we can't detect if expression() discarded significant digits
1540 * in the case of a long. Not worth the crocks required to fix it.
1543 /* Select a parser for cons expressions. */
1545 /* Some targets need to parse the expression in various fancy ways.
1546 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1547 (for example, the HPPA does this). Otherwise, you can define
1548 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1549 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1550 are defined, which is the normal case, then only simple expressions
1553 #ifndef TC_PARSE_CONS_EXPRESSION
1554 #ifdef BITFIELD_CONS_EXPRESSIONS
1555 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1557 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1560 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1562 parse_mri_cons PARAMS ((expressionS *exp));
1564 #ifdef REPEAT_CONS_EXPRESSIONS
1565 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1567 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1570 /* If we haven't gotten one yet, just call expression. */
1571 #ifndef TC_PARSE_CONS_EXPRESSION
1572 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1576 /* worker to do .byte etc statements */
1577 /* clobbers input_line_pointer, checks */
1581 register int nbytes; /* 1=.byte, 2=.word, 4=.long */
1585 if (is_it_end_of_statement ())
1587 demand_empty_rest_of_line ();
1593 TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
1594 emit_expr (&exp, (unsigned int) nbytes);
1596 while (*input_line_pointer++ == ',');
1598 input_line_pointer--; /* Put terminator back into stream. */
1599 demand_empty_rest_of_line ();
1602 /* Put the contents of expression EXP into the object file using
1603 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1606 emit_expr (exp, nbytes)
1608 unsigned int nbytes;
1612 valueT extra_digit = 0;
1614 /* Don't do anything if we are going to make another pass. */
1620 /* Handle a negative bignum. */
1622 && exp->X_add_number == 0
1623 && exp->X_add_symbol->sy_value.X_op == O_big
1624 && exp->X_add_symbol->sy_value.X_add_number > 0)
1627 unsigned long carry;
1629 exp = &exp->X_add_symbol->sy_value;
1631 /* Negate the bignum: one's complement each digit and add 1. */
1633 for (i = 0; i < exp->X_add_number; i++)
1637 next = (((~ (generic_bignum[i] & LITTLENUM_MASK))
1640 generic_bignum[i] = next & LITTLENUM_MASK;
1641 carry = next >> LITTLENUM_NUMBER_OF_BITS;
1644 /* We can ignore any carry out, because it will be handled by
1645 extra_digit if it is needed. */
1647 extra_digit = (valueT) -1;
1651 if (op == O_absent || op == O_illegal)
1653 as_warn ("zero assumed for missing expression");
1654 exp->X_add_number = 0;
1657 else if (op == O_big && exp->X_add_number <= 0)
1659 as_bad ("floating point number invalid; zero assumed");
1660 exp->X_add_number = 0;
1663 else if (op == O_register)
1665 as_warn ("register value used as expression");
1669 p = frag_more ((int) nbytes);
1671 #ifndef WORKING_DOT_WORD
1672 /* If we have the difference of two symbols in a word, save it on
1673 the broken_words list. See the code in write.c. */
1674 if (op == O_subtract && nbytes == 2)
1676 struct broken_word *x;
1678 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1679 x->next_broken_word = broken_words;
1682 x->word_goes_here = p;
1684 x->add = exp->X_add_symbol;
1685 x->sub = exp->X_op_symbol;
1686 x->addnum = exp->X_add_number;
1693 /* If we have an integer, but the number of bytes is too large to
1694 pass to md_number_to_chars, handle it as a bignum. */
1695 if (op == O_constant && nbytes > sizeof (valueT))
1700 if (! exp->X_unsigned && exp->X_add_number < 0)
1701 extra_digit = (valueT) -1;
1702 val = (valueT) exp->X_add_number;
1706 generic_bignum[gencnt] = val & LITTLENUM_MASK;
1707 val >>= LITTLENUM_NUMBER_OF_BITS;
1711 op = exp->X_op = O_big;
1712 exp->X_add_number = gencnt;
1715 if (op == O_constant)
1720 register long unmask;
1722 /* JF << of >= number of bits in the object is undefined. In
1723 particular SPARC (Sun 4) has problems */
1724 if (nbytes >= sizeof (long))
1727 mask = ~0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1729 unmask = ~mask; /* Do store these bits. */
1732 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1733 mask = ~(unmask >> 1); /* Includes sign bit now. */
1736 get = exp->X_add_number;
1738 if ((get & mask) != 0 && (get & mask) != mask)
1739 { /* Leading bits contain both 0s & 1s. */
1740 as_warn ("Value 0x%lx truncated to 0x%lx.", get, use);
1742 /* put bytes in right order. */
1743 md_number_to_chars (p, (valueT) use, (int) nbytes);
1745 else if (op == O_big)
1748 LITTLENUM_TYPE *nums;
1750 know (nbytes % CHARS_PER_LITTLENUM == 0);
1752 size = exp->X_add_number * CHARS_PER_LITTLENUM;
1755 as_warn ("Bignum truncated to %d bytes", nbytes);
1759 if (target_big_endian)
1761 while (nbytes > size)
1763 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1764 nbytes -= CHARS_PER_LITTLENUM;
1765 p += CHARS_PER_LITTLENUM;
1768 nums = generic_bignum + size / CHARS_PER_LITTLENUM;
1772 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1773 size -= CHARS_PER_LITTLENUM;
1774 p += CHARS_PER_LITTLENUM;
1779 nums = generic_bignum;
1782 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1784 size -= CHARS_PER_LITTLENUM;
1785 p += CHARS_PER_LITTLENUM;
1786 nbytes -= CHARS_PER_LITTLENUM;
1791 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1792 nbytes -= CHARS_PER_LITTLENUM;
1793 p += CHARS_PER_LITTLENUM;
1799 md_number_to_chars (p, (valueT) 0, (int) nbytes);
1801 /* Now we need to generate a fixS to record the symbol value.
1802 This is easy for BFD. For other targets it can be more
1803 complex. For very complex cases (currently, the HPPA and
1804 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1805 want. For simpler cases, you can define TC_CONS_RELOC to be
1806 the name of the reloc code that should be stored in the fixS.
1807 If neither is defined, the code uses NO_RELOC if it is
1808 defined, and otherwise uses 0. */
1810 #ifdef BFD_ASSEMBLER
1811 #ifdef TC_CONS_FIX_NEW
1812 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1814 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1815 /* @@ Should look at CPU word size. */
1816 nbytes == 2 ? BFD_RELOC_16
1817 : nbytes == 8 ? BFD_RELOC_64
1821 #ifdef TC_CONS_FIX_NEW
1822 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1824 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1825 it is defined, otherwise use NO_RELOC if it is defined,
1827 #ifndef TC_CONS_RELOC
1829 #define TC_CONS_RELOC NO_RELOC
1831 #define TC_CONS_RELOC 0
1834 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1836 #endif /* TC_CONS_FIX_NEW */
1837 #endif /* BFD_ASSEMBLER */
1841 #ifdef BITFIELD_CONS_EXPRESSIONS
1843 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1844 w:x,y:z, where w and y are bitwidths and x and y are values. They
1845 then pack them all together. We do a little better in that we allow
1846 them in words, longs, etc. and we'll pack them in target byte order
1849 The rules are: pack least significat bit first, if a field doesn't
1850 entirely fit, put it in the next unit. Overflowing the bitfield is
1851 explicitly *not* even a warning. The bitwidth should be considered
1854 To use this function the tc-XXX.h file should define
1855 BITFIELD_CONS_EXPRESSIONS. */
1858 parse_bitfield_cons (exp, nbytes)
1860 unsigned int nbytes;
1862 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1863 char *hold = input_line_pointer;
1865 (void) expression (exp);
1867 if (*input_line_pointer == ':')
1873 unsigned long width;
1875 if (*input_line_pointer != ':')
1877 input_line_pointer = hold;
1879 } /* next piece is not a bitfield */
1881 /* In the general case, we can't allow
1882 full expressions with symbol
1883 differences and such. The relocation
1884 entries for symbols not defined in this
1885 assembly would require arbitrary field
1886 widths, positions, and masks which most
1887 of our current object formats don't
1890 In the specific case where a symbol
1891 *is* defined in this assembly, we
1892 *could* build fixups and track it, but
1893 this could lead to confusion for the
1894 backends. I'm lazy. I'll take any
1895 SEG_ABSOLUTE. I think that means that
1896 you can use a previous .set or
1897 .equ type symbol. xoxorich. */
1899 if (exp->X_op == O_absent)
1901 as_warn ("using a bit field width of zero");
1902 exp->X_add_number = 0;
1903 exp->X_op = O_constant;
1904 } /* implied zero width bitfield */
1906 if (exp->X_op != O_constant)
1908 *input_line_pointer = '\0';
1909 as_bad ("field width \"%s\" too complex for a bitfield", hold);
1910 *input_line_pointer = ':';
1911 demand_empty_rest_of_line ();
1915 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1917 as_warn ("field width %lu too big to fit in %d bytes: truncated to %d bits",
1918 width, nbytes, (BITS_PER_CHAR * nbytes));
1919 width = BITS_PER_CHAR * nbytes;
1922 if (width > bits_available)
1924 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1925 input_line_pointer = hold;
1926 exp->X_add_number = value;
1930 hold = ++input_line_pointer; /* skip ':' */
1932 (void) expression (exp);
1933 if (exp->X_op != O_constant)
1935 char cache = *input_line_pointer;
1937 *input_line_pointer = '\0';
1938 as_bad ("field value \"%s\" too complex for a bitfield", hold);
1939 *input_line_pointer = cache;
1940 demand_empty_rest_of_line ();
1944 value |= ((~(-1 << width) & exp->X_add_number)
1945 << ((BITS_PER_CHAR * nbytes) - bits_available));
1947 if ((bits_available -= width) == 0
1948 || is_it_end_of_statement ()
1949 || *input_line_pointer != ',')
1952 } /* all the bitfields we're gonna get */
1954 hold = ++input_line_pointer;
1955 (void) expression (exp);
1956 } /* forever loop */
1958 exp->X_add_number = value;
1959 exp->X_op = O_constant;
1960 exp->X_unsigned = 1;
1961 } /* if looks like a bitfield */
1962 } /* parse_bitfield_cons() */
1964 #endif /* BITFIELD_CONS_EXPRESSIONS */
1969 parse_mri_cons (exp, nbytes)
1971 unsigned int nbytes;
1973 if (*input_line_pointer == '\'')
1975 /* An MRI style string, cut into as many bytes as will fit into
1976 a nbyte chunk, left justify if necessary, and separate with
1977 commas so we can try again later */
1979 unsigned int result = 0;
1980 input_line_pointer++;
1981 for (scan = 0; scan < nbytes; scan++)
1983 if (*input_line_pointer == '\'')
1985 if (input_line_pointer[1] == '\'')
1987 input_line_pointer++;
1992 result = (result << 8) | (*input_line_pointer++);
1996 while (scan < nbytes)
2001 /* Create correct expression */
2002 exp->X_op = O_constant;
2003 exp->X_add_number = result;
2004 /* Fake it so that we can read the next char too */
2005 if (input_line_pointer[0] != '\'' ||
2006 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
2008 input_line_pointer -= 2;
2009 input_line_pointer[0] = ',';
2010 input_line_pointer[1] = '\'';
2013 input_line_pointer++;
2021 #ifdef REPEAT_CONS_EXPRESSIONS
2023 /* Parse a repeat expression for cons. This is used by the MIPS
2024 assembler. The format is NUMBER:COUNT; NUMBER appears in the
2025 object file COUNT times.
2027 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
2030 parse_repeat_cons (exp, nbytes)
2032 unsigned int nbytes;
2039 if (*input_line_pointer != ':')
2041 /* No repeat count. */
2045 ++input_line_pointer;
2046 expression (&count);
2047 if (count.X_op != O_constant
2048 || count.X_add_number <= 0)
2050 as_warn ("Unresolvable or nonpositive repeat count; using 1");
2054 /* The cons function is going to output this expression once. So we
2055 output it count - 1 times. */
2056 for (i = count.X_add_number - 1; i > 0; i--)
2057 emit_expr (exp, nbytes);
2060 #endif /* REPEAT_CONS_EXPRESSIONS */
2065 * CONStruct some more frag chars of .floats .ffloats etc.
2066 * Makes 0 or more new frags.
2067 * If need_pass_2 == 1, no frags are emitted.
2068 * This understands only floating literals, not expressions. Sorry.
2070 * A floating constant is defined by atof_generic(), except it is preceded
2071 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2072 * reading, I decided to be incompatible. This always tries to give you
2073 * rounded bits to the precision of the pseudo-op. Former AS did premature
2074 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2075 * a choice of 2 flavours of noise according to which of 2 floating-point
2076 * scanners you directed AS to use.
2078 * In: input_line_pointer->whitespace before, or '0' of flonum.
2083 float_cons (float_type)
2084 /* Clobbers input_line-pointer, checks end-of-line. */
2085 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2088 int length; /* Number of chars in an object. */
2089 register char *err; /* Error from scanning floating literal. */
2090 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2092 if (is_it_end_of_statement ())
2094 demand_empty_rest_of_line ();
2100 /* input_line_pointer->1st char of a flonum (we hope!). */
2103 /* Skip any 0{letter} that may be present. Don't even check if the
2104 * letter is legal. Someone may invent a "z" format and this routine
2105 * has no use for such information. Lusers beware: you get
2106 * diagnostics if your input is ill-conditioned.
2108 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2109 input_line_pointer += 2;
2111 err = md_atof (float_type, temp, &length);
2112 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2116 as_bad ("Bad floating literal: %s", err);
2117 ignore_rest_of_line ();
2127 #ifdef REPEAT_CONS_EXPRESSIONS
2128 if (*input_line_pointer == ':')
2130 expressionS count_exp;
2132 ++input_line_pointer;
2133 expression (&count_exp);
2134 if (count_exp.X_op != O_constant
2135 || count_exp.X_add_number <= 0)
2137 as_warn ("unresolvable or nonpositive repeat count; using 1");
2140 count = count_exp.X_add_number;
2144 while (--count >= 0)
2146 p = frag_more (length);
2147 memcpy (p, temp, (unsigned int) length);
2152 while (*input_line_pointer++ == ',');
2154 --input_line_pointer; /* Put terminator back into stream. */
2155 demand_empty_rest_of_line ();
2156 } /* float_cons() */
2161 * We read 0 or more ',' seperated, double-quoted strings.
2163 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2168 stringer (append_zero) /* Worker to do .ascii etc statements. */
2169 /* Checks end-of-line. */
2170 register int append_zero; /* 0: don't append '\0', else 1 */
2172 register unsigned int c;
2175 * The following awkward logic is to parse ZERO or more strings,
2176 * comma seperated. Recall a string expression includes spaces
2177 * before the opening '\"' and spaces after the closing '\"'.
2178 * We fake a leading ',' if there is (supposed to be)
2179 * a 1st, expression. We keep demanding expressions for each
2182 if (is_it_end_of_statement ())
2184 c = 0; /* Skip loop. */
2185 ++input_line_pointer; /* Compensate for end of loop. */
2189 c = ','; /* Do loop. */
2191 while (c == ',' || c == '<' || c == '"')
2194 switch (*input_line_pointer)
2197 ++input_line_pointer; /*->1st char of string. */
2198 while (is_a_char (c = next_char_of_string ()))
2200 FRAG_APPEND_1_CHAR (c);
2204 FRAG_APPEND_1_CHAR (0);
2206 know (input_line_pointer[-1] == '\"');
2209 input_line_pointer++;
2210 c = get_single_number ();
2211 FRAG_APPEND_1_CHAR (c);
2212 if (*input_line_pointer != '>')
2214 as_bad ("Expected <nn>");
2216 input_line_pointer++;
2219 input_line_pointer++;
2223 c = *input_line_pointer;
2226 demand_empty_rest_of_line ();
2229 /* FIXME-SOMEDAY: I had trouble here on characters with the
2230 high bits set. We'll probably also have trouble with
2231 multibyte chars, wide chars, etc. Also be careful about
2232 returning values bigger than 1 byte. xoxorich. */
2235 next_char_of_string ()
2237 register unsigned int c;
2239 c = *input_line_pointer++ & CHAR_MASK;
2247 switch (c = *input_line_pointer++)
2277 break; /* As itself. */
2293 for (i = 0, number = 0; isdigit (c) && i < 3; c = *input_line_pointer++, i++)
2295 number = number * 8 + c - '0';
2299 --input_line_pointer;
2308 c = *input_line_pointer++;
2309 while (isxdigit (c))
2312 number = number * 16 + c - '0';
2313 else if (isupper (c))
2314 number = number * 16 + c - 'A' + 10;
2316 number = number * 16 + c - 'a' + 10;
2317 c = *input_line_pointer++;
2320 --input_line_pointer;
2325 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2326 as_warn ("Unterminated string: Newline inserted.");
2332 #ifdef ONLY_STANDARD_ESCAPES
2333 as_bad ("Bad escaped character in string, '?' assumed");
2335 #endif /* ONLY_STANDARD_ESCAPES */
2338 } /* switch on escaped char */
2343 } /* switch on char */
2345 } /* next_char_of_string() */
2348 get_segmented_expression (expP)
2349 register expressionS *expP;
2351 register segT retval;
2353 retval = expression (expP);
2354 if (expP->X_op == O_illegal
2355 || expP->X_op == O_absent
2356 || expP->X_op == O_big)
2358 as_bad ("expected address expression; zero assumed");
2359 expP->X_op = O_constant;
2360 expP->X_add_number = 0;
2361 retval = absolute_section;
2367 get_known_segmented_expression (expP)
2368 register expressionS *expP;
2370 register segT retval;
2372 if ((retval = get_segmented_expression (expP)) == undefined_section)
2374 /* There is no easy way to extract the undefined symbol from the
2376 if (expP->X_add_symbol != NULL
2377 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
2378 as_warn ("symbol \"%s\" undefined; zero assumed",
2379 S_GET_NAME (expP->X_add_symbol));
2381 as_warn ("some symbol undefined; zero assumed");
2382 retval = absolute_section;
2383 expP->X_op = O_constant;
2384 expP->X_add_number = 0;
2386 know (retval == absolute_section || SEG_NORMAL (retval));
2388 } /* get_known_segmented_expression() */
2391 get_absolute_expression ()
2396 if (exp.X_op != O_constant)
2398 if (exp.X_op != O_absent)
2399 as_bad ("bad absolute expression; zero assumed");
2400 exp.X_add_number = 0;
2402 return exp.X_add_number;
2405 char /* return terminator */
2406 get_absolute_expression_and_terminator (val_pointer)
2407 long *val_pointer; /* return value of expression */
2409 /* FIXME: val_pointer should probably be offsetT *. */
2410 *val_pointer = (long) get_absolute_expression ();
2411 return (*input_line_pointer++);
2415 * demand_copy_C_string()
2417 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2418 * Give a warning if that happens.
2421 demand_copy_C_string (len_pointer)
2426 if ((s = demand_copy_string (len_pointer)) != 0)
2430 for (len = *len_pointer;
2439 as_bad ("This string may not contain \'\\0\'");
2447 * demand_copy_string()
2449 * Demand string, but return a safe (=private) copy of the string.
2450 * Return NULL if we can't read a string here.
2453 demand_copy_string (lenP)
2456 register unsigned int c;
2462 if (*input_line_pointer == '\"')
2464 input_line_pointer++; /* Skip opening quote. */
2466 while (is_a_char (c = next_char_of_string ()))
2468 obstack_1grow (¬es, c);
2471 /* JF this next line is so demand_copy_C_string will return a null
2472 termanated string. */
2473 obstack_1grow (¬es, '\0');
2474 retval = obstack_finish (¬es);
2478 as_warn ("Missing string");
2480 ignore_rest_of_line ();
2484 } /* demand_copy_string() */
2487 * is_it_end_of_statement()
2489 * In: Input_line_pointer->next character.
2491 * Do: Skip input_line_pointer over all whitespace.
2493 * Out: 1 if input_line_pointer->end-of-line.
2496 is_it_end_of_statement ()
2499 return (is_end_of_line[(unsigned char) *input_line_pointer]);
2500 } /* is_it_end_of_statement() */
2506 register symbolS *symbolP; /* symbol we are working with */
2508 input_line_pointer++;
2509 if (*input_line_pointer == '=')
2510 input_line_pointer++;
2512 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2513 input_line_pointer++;
2515 if (sym_name[0] == '.' && sym_name[1] == '\0')
2517 /* Turn '. = mumble' into a .org mumble */
2518 register segT segment;
2522 segment = get_known_segmented_expression (&exp);
2525 if (segment != now_seg && segment != absolute_section)
2526 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2527 segment_name (segment),
2528 segment_name (now_seg));
2529 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2530 exp.X_add_number, (char *) 0);
2532 } /* if (ok to make frag) */
2536 symbolP = symbol_find_or_make (sym_name);
2537 pseudo_set (symbolP);
2541 /* .include -- include a file at this point. */
2554 filename = demand_copy_string (&i);
2555 demand_empty_rest_of_line ();
2556 path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
2557 for (i = 0; i < include_dir_count; i++)
2559 strcpy (path, include_dirs[i]);
2561 strcat (path, filename);
2562 if (0 != (try = fopen (path, "r")))
2571 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2572 newbuf = input_scrub_include_file (path, input_line_pointer);
2573 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2577 add_include_dir (path)
2582 if (include_dir_count == 0)
2584 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2585 include_dirs[0] = "."; /* Current dir */
2586 include_dir_count = 2;
2590 include_dir_count++;
2591 include_dirs = (char **) realloc (include_dirs,
2592 include_dir_count * sizeof (*include_dirs));
2595 include_dirs[include_dir_count - 1] = path; /* New one */
2598 if (i > include_dir_maxlen)
2599 include_dir_maxlen = i;
2600 } /* add_include_dir() */
2606 while (!is_end_of_line[(unsigned char) *input_line_pointer])
2608 ++input_line_pointer;
2610 ++input_line_pointer;
2616 * Handle .stabX directives, which used to be open-coded.
2617 * So much creeping featurism overloaded the semantics that we decided
2618 * to put all .stabX thinking in one place. Here.
2620 * We try to make any .stabX directive legal. Other people's AS will often
2621 * do assembly-time consistency checks: eg assigning meaning to n_type bits
2622 * and "protecting" you from setting them to certain values. (They also zero
2623 * certain bits before emitting symbols. Tut tut.)
2625 * If an expression is not absolute we either gripe or use the relocation
2626 * information. Other people's assemblers silently forget information they
2627 * don't need and invent information they need that you didn't supply.
2631 * Build a string dictionary entry for a .stabX symbol.
2632 * The symbol is added to the .<secname>str section.
2635 #ifdef SEPARATE_STAB_SECTIONS
2638 get_stab_string_offset (string, stabstr_secname)
2640 const char *stabstr_secname;
2642 unsigned int length;
2643 unsigned int retval;
2646 length = strlen (string);
2648 { /* Ordinary case. */
2650 subsegT save_subseg;
2656 save_subseg = now_subseg;
2658 /* Create the stab string section. */
2659 newsecname = xmalloc ((unsigned long) (strlen (stabstr_secname) + 1));
2660 strcpy (newsecname, stabstr_secname);
2662 seg = subseg_new (newsecname, 0);
2664 retval = seg_info (seg)->stabu.stab_string_size;
2669 /* Make sure the first string is empty. */
2672 retval = seg_info (seg)->stabu.stab_string_size = 1;
2673 #ifdef BFD_ASSEMBLER
2674 bfd_set_section_flags (stdoutput, seg, SEC_READONLY | SEC_DEBUGGING);
2680 p = frag_more (length + 1);
2683 seg_info (seg)->stabu.stab_string_size += length + 1;
2685 subseg_set (save_seg, save_subseg);
2691 #endif /* SEPARATE_STAB_SECTIONS */
2693 /* This can handle different kinds of stabs (s,n,d) and different
2694 kinds of stab sections. */
2697 s_stab_generic (what, stab_secname, stabstr_secname)
2700 char *stabstr_secname;
2708 /* The general format is:
2709 .stabs "STRING",TYPE,OTHER,DESC,VALUE
2710 .stabn TYPE,OTHER,DESC,VALUE
2711 .stabd TYPE,OTHER,DESC
2712 At this point input_line_pointer points after the pseudo-op and
2713 any trailing whitespace. The argument what is one of 's', 'n' or
2714 'd' indicating which type of .stab this is. */
2722 string = demand_copy_C_string (&length);
2724 if (*input_line_pointer == ',')
2725 input_line_pointer++;
2728 as_warn (".stabs: Missing comma");
2729 ignore_rest_of_line ();
2734 if (get_absolute_expression_and_terminator (&longint) != ',')
2736 as_warn (".stab%c: Missing comma", what);
2737 ignore_rest_of_line ();
2742 if (get_absolute_expression_and_terminator (&longint) != ',')
2744 as_warn (".stab%c: Missing comma", what);
2745 ignore_rest_of_line ();
2750 desc = get_absolute_expression ();
2751 if (what == 's' || what == 'n')
2753 if (*input_line_pointer != ',')
2755 as_warn (".stab%c: Missing comma", what);
2756 ignore_rest_of_line ();
2759 input_line_pointer++;
2763 /* We have now gathered the type, other, and desc information. For
2764 .stabs or .stabn, input_line_pointer is now pointing at the
2767 #ifdef SEPARATE_STAB_SECTIONS
2768 /* Output the stab information in a separate section. This is used
2769 at least for COFF and ELF. */
2771 segT saved_seg = now_seg;
2772 subsegT saved_subseg = now_subseg;
2773 fragS *saved_frag = frag_now;
2776 unsigned int stroff;
2779 dot = frag_now_fix ();
2781 seg = subseg_new (stab_secname, 0);
2783 if (! seg_info (seg)->hadone)
2785 #ifdef BFD_ASSEMBLER
2786 bfd_set_section_flags (stdoutput, seg,
2787 SEC_READONLY | SEC_RELOC | SEC_DEBUGGING);
2789 #ifdef INIT_STAB_SECTION
2790 INIT_STAB_SECTION (seg);
2792 seg_info (seg)->hadone = 1;
2795 stroff = get_stab_string_offset (string, stabstr_secname);
2797 /* At least for now, stabs in a special stab section are always
2798 output as 12 byte blocks of information. */
2800 md_number_to_chars (p, (valueT) stroff, 4);
2801 md_number_to_chars (p + 4, (valueT) type, 1);
2802 md_number_to_chars (p + 5, (valueT) other, 1);
2803 md_number_to_chars (p + 6, (valueT) desc, 2);
2805 if (what == 's' || what == 'n')
2807 /* Pick up the value from the input line. */
2809 input_line_pointer--;
2817 /* Arrange for a value representing the current location. */
2818 fake = FAKE_LABEL_NAME;
2819 symbol = symbol_new (fake, saved_seg, dot, saved_frag);
2821 exp.X_op = O_symbol;
2822 exp.X_add_symbol = symbol;
2823 exp.X_add_number = 0;
2825 emit_expr (&exp, 4);
2828 #ifdef OBJ_PROCESS_STAB
2829 OBJ_PROCESS_STAB (seg, string, stroff, type, other, desc);
2832 subseg_set (saved_seg, saved_subseg);
2834 #else /* ! SEPARATE_STAB_SECTIONS */
2835 #ifdef OBJ_PROCESS_STAB
2836 OBJ_PROCESS_STAB (what, string, type, other, desc);
2838 /* Put the stab information in the symbol table. */
2842 symbol = symbol_new (string, undefined_section, 0,
2843 (struct frag *) NULL);
2844 if (what == 's' || what == 'n')
2846 /* Pick up the value from the input line. */
2847 symbol->sy_frag = &zero_address_frag;
2848 pseudo_set (symbol);
2852 /* .stabd sets the name to NULL. Why? */
2853 S_SET_NAME (symbol, NULL);
2854 symbol->sy_frag = frag_now;
2855 S_SET_VALUE (symbol, (valueT) frag_now_fix ());
2858 S_SET_TYPE (symbol, type);
2859 S_SET_OTHER (symbol, other);
2860 S_SET_DESC (symbol, desc);
2862 #endif /* ! OBJ_PROCESS_STAB */
2863 #endif /* ! SEPARATE_STAB_SECTIONS */
2871 listing_source_line ((unsigned int) desc);
2875 listing_source_file (string);
2879 #endif /* ! NO_LISTING */
2881 demand_empty_rest_of_line ();
2884 /* Regular stab directive. */
2890 s_stab_generic (what, STAB_SECTION_NAME, STAB_STRING_SECTION_NAME);
2893 /* "Extended stabs", used in Solaris only now. */
2900 char *stab_secname, *stabstr_secname;
2902 stab_secname = demand_copy_C_string (&length);
2904 if (*input_line_pointer == ',')
2905 input_line_pointer++;
2908 as_bad ("comma missing in .xstabs");
2909 ignore_rest_of_line ();
2913 /* To get the name of the stab string section, simply .str to
2914 the stab section name. */
2915 stabstr_secname = (char *) xmalloc (strlen (stab_secname) + 4);
2916 strcpy (stabstr_secname, stab_secname);
2917 strcat (stabstr_secname, "str");
2918 s_stab_generic (what, stab_secname, stabstr_secname);
2919 free (stabstr_secname);
2924 /* Frob invented at RMS' request. Set the n_desc of a symbol. */
2936 name = input_line_pointer;
2937 c = get_symbol_end ();
2938 p = input_line_pointer;
2941 if (*input_line_pointer != ',')
2944 as_bad ("Expected comma after name \"%s\"", name);
2946 ignore_rest_of_line ();
2950 input_line_pointer++;
2951 temp = get_absolute_expression ();
2953 symbolP = symbol_find_or_make (name);
2955 S_SET_DESC (symbolP, temp);
2957 demand_empty_rest_of_line ();
2960 #endif /* defined (S_SET_DESC) */