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 #ifndef TC_START_LABEL
49 #define TC_START_LABEL(x,y) (x==':')
52 /* The NOP_OPCODE is for the alignment fill value.
53 * fill it a nop instruction so that the disassembler does not choke
57 #define NOP_OPCODE 0x00
60 char *input_line_pointer; /*->next char of source file to parse. */
62 #if BITS_PER_CHAR != 8
63 /* The following table is indexed by[(char)] and will break if
64 a char does not have exactly 256 states (hopefully 0:255!)! */
69 /* The m88k unfortunately uses @ as a label beginner. */
73 /* used by is_... macros. our ctype[] */
74 const char lex_type[256] =
76 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
77 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
78 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
79 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
80 LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
81 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
82 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
83 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
84 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
85 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
86 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
87 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
96 * Out: 1 if this character ends a line.
99 char is_end_of_line[256] =
102 _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
104 _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
106 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
108 _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
109 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
111 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
112 _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
114 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
115 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
116 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
117 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
118 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
119 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
120 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
121 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
122 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
126 /* Functions private to this file. */
128 static char *buffer; /* 1st char of each buffer of lines is here. */
129 static char *buffer_limit; /*->1 + last char in buffer. */
131 int target_big_endian;
133 static char *old_buffer; /* JF a hack */
134 static char *old_input;
135 static char *old_limit;
137 /* Variables for handling include file directory list. */
139 char **include_dirs; /* List of pointers to directories to
140 search for .include's */
141 int include_dir_count; /* How many are in the list */
142 int include_dir_maxlen = 1;/* Length of longest in list */
144 #ifndef WORKING_DOT_WORD
145 struct broken_word *broken_words;
146 int new_broken_words;
149 static char *demand_copy_string PARAMS ((int *lenP));
150 int is_it_end_of_statement PARAMS ((void));
151 static segT get_segmented_expression PARAMS ((expressionS *expP));
152 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
153 static void pobegin PARAMS ((void));
162 obj_read_begin_hook ();
164 /* Something close -- but not too close -- to a multiple of 1024.
165 The debugging malloc I'm using has 24 bytes of overhead. */
166 obstack_begin (¬es, 5090);
167 obstack_begin (&cond_obstack, 990);
169 /* Use machine dependent syntax */
170 for (p = line_separator_chars; *p; p++)
171 is_end_of_line[(unsigned char) *p] = 1;
172 /* Use more. FIXME-SOMEDAY. */
175 /* set up pseudo-op tables */
177 struct hash_control *po_hash;
179 static const pseudo_typeS potable[] =
181 {"abort", s_abort, 0},
182 {"align", s_align_ptwo, 0},
183 {"ascii", stringer, 0},
184 {"asciz", stringer, 1},
193 {"double", float_cons, 'd'},
195 {"eject", listing_eject, 0}, /* Formfeed listing */
198 {"endif", s_endif, 0},
203 {"extern", s_ignore, 0}, /* We treat all undef as ext */
204 {"appfile", s_app_file, 1},
205 {"appline", s_app_line, 0},
206 {"file", s_app_file, 0},
208 {"float", float_cons, 'f'},
209 {"global", s_globl, 0},
210 {"globl", s_globl, 0},
213 {"ifdef", s_ifdef, 0},
214 {"ifeqs", s_ifeqs, 0},
215 {"ifndef", s_ifdef, 1},
216 {"ifnes", s_ifeqs, 1},
217 {"ifnotdef", s_ifdef, 1},
218 {"include", s_include, 0},
220 {"lcomm", s_lcomm, 0},
221 {"lflags", listing_flags, 0}, /* Listing flags */
222 {"list", listing_list, 1}, /* Turn listing on */
225 {"nolist", listing_list, 0}, /* Turn listing off */
228 {"psize", listing_psize, 0}, /* set paper size */
231 {"sbttl", listing_title, 1}, /* Subtitle of listing */
236 {"single", float_cons, 'f'},
238 {"space", s_space, 0},
239 {"stabd", s_stab, 'd'},
240 {"stabn", s_stab, 'n'},
241 {"stabs", s_stab, 's'},
242 {"string", stringer, 1},
245 {"title", listing_title, 0}, /* Listing title */
249 {"xstabs", s_xstab, 's'},
251 {NULL} /* end sentinel */
257 const char *errtxt; /* error text */
258 const pseudo_typeS *pop;
260 po_hash = hash_new ();
262 /* Do the target-specific pseudo ops. */
263 for (pop = md_pseudo_table; pop->poc_name; pop++)
265 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
268 as_fatal ("error constructing md pseudo-op table");
272 /* Now object specific. Skip any that were in the target table. */
273 for (pop = obj_pseudo_table; pop->poc_name; pop++)
275 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
278 if (!strcmp (errtxt, "exists"))
280 #ifdef DIE_ON_OVERRIDES
281 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
282 #endif /* DIE_ON_OVERRIDES */
283 continue; /* OK if target table overrides. */
287 as_fatal ("error constructing obj pseudo-op table");
288 } /* if overridden */
292 /* Now portable ones. Skip any that we've seen already. */
293 for (pop = potable; pop->poc_name; pop++)
295 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
298 if (!strcmp (errtxt, "exists"))
300 #ifdef DIE_ON_OVERRIDES
301 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
302 #endif /* DIE_ON_OVERRIDES */
303 continue; /* OK if target table overrides. */
307 as_fatal ("error constructing obj pseudo-op table");
308 } /* if overridden */
315 #define HANDLE_CONDITIONAL_ASSEMBLY() \
316 if (ignore_input ()) \
318 while (! is_end_of_line[(unsigned char) *input_line_pointer++]) \
319 if (input_line_pointer == buffer_limit) \
325 /* read_a_source_file()
327 * We read the file, putting things into a web that
328 * represents what we have been reading.
331 read_a_source_file (name)
335 register char *s; /* string of symbol, '\0' appended */
339 buffer = input_scrub_new_file (name);
342 listing_newline ("");
344 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
345 { /* We have another line to parse. */
346 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
347 contin: /* JF this goto is my fault I admit it.
348 Someone brave please re-write the whole
349 input section here? Pleeze??? */
350 while (input_line_pointer < buffer_limit)
352 /* We have more of this buffer to parse. */
355 * We now have input_line_pointer->1st char of next line.
356 * If input_line_pointer [-1] == '\n' then we just
357 * scanned another line: so bump line counters.
359 if (is_end_of_line[input_line_pointer[-1]])
361 if (input_line_pointer[-1] == '\n')
362 bump_line_counters ();
364 #if defined (MRI) || defined (LABELS_WITHOUT_COLONS)
365 /* Text at the start of a line must be a label, we run down
366 and stick a colon in. */
367 if (is_name_beginner (*input_line_pointer))
369 char *line_start = input_line_pointer;
370 char c = get_symbol_end ();
372 *input_line_pointer = c;
374 input_line_pointer++;
382 * We are at the begining of a line, or similar place.
383 * We expect a well-formed assembler statement.
384 * A "symbol-name:" is a statement.
386 * Depending on what compiler is used, the order of these tests
387 * may vary to catch most common case 1st.
388 * Each test is independent of all other tests at the (top) level.
389 * PLEASE make a compiler that doesn't use this assembler.
390 * It is crufty to waste a compiler's time encoding things for this
391 * assembler, which then wastes more time decoding it.
392 * (And communicating via (linear) files is silly!
393 * If you must pass stuff, please pass a tree!)
395 if ((c = *input_line_pointer++) == '\t'
400 c = *input_line_pointer++;
402 know (c != ' '); /* No further leading whitespace. */
405 * C is the 1st significant character.
406 * Input_line_pointer points after that character.
408 if (is_name_beginner (c))
409 { /* want user-defined label or pseudo/opcode */
410 HANDLE_CONDITIONAL_ASSEMBLY ();
412 s = --input_line_pointer;
413 c = get_symbol_end (); /* name's delimiter */
415 * C is character after symbol.
416 * That character's place in the input line is now '\0'.
417 * S points to the beginning of the symbol.
418 * [In case of pseudo-op, s->'.'.]
419 * Input_line_pointer->'\0' where c was.
421 if (TC_START_LABEL(c, input_line_pointer))
423 colon (s); /* user-defined label */
424 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
425 /* Input_line_pointer->after ':'. */
431 || (input_line_pointer[1] == '='
432 #ifdef TC_EQUAL_IN_INSN
433 && ! TC_EQUAL_IN_INSN (c, input_line_pointer)
438 demand_empty_rest_of_line ();
441 { /* expect pseudo-op or machine instruction */
443 if (!done_pseudo (s))
449 #define IGNORE_OPCODE_CASE
450 #ifdef IGNORE_OPCODE_CASE
463 /* The m88k uses pseudo-ops without a period. */
464 pop = (pseudo_typeS *) hash_find (po_hash, s);
465 if (pop != NULL && pop->poc_handler == NULL)
469 if (pop != NULL || *s == '.')
474 * WARNING: c has next char, which may be end-of-line.
475 * We lookup the pseudo-op table with s+1 because we
476 * already know that the pseudo-op begins with a '.'.
480 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
482 /* Print the error msg now, while we still can */
485 as_bad ("Unknown pseudo-op: `%s'", s);
486 *input_line_pointer = c;
491 /* Put it back for error messages etc. */
492 *input_line_pointer = c;
493 /* The following skip of whitespace is compulsory.
494 A well shaped space is sometimes all that separates
495 keyword from operands. */
496 if (c == ' ' || c == '\t')
497 input_line_pointer++;
499 * Input_line is restored.
500 * Input_line_pointer->1st non-blank char
501 * after pseudo-operation.
503 (*pop->poc_handler) (pop->poc_val);
507 { /* machine instruction */
508 /* WARNING: c has char, which may be end-of-line. */
509 /* Also: input_line_pointer->`\0` where c was. */
510 *input_line_pointer = c;
511 while (!is_end_of_line[(unsigned char) *input_line_pointer]
512 #ifdef TC_EOL_IN_INSN
513 || TC_EOL_IN_INSN (input_line_pointer)
517 input_line_pointer++;
520 c = *input_line_pointer;
521 *input_line_pointer = '\0';
523 md_assemble (s); /* Assemble 1 instruction. */
525 *input_line_pointer++ = c;
527 /* We resume loop AFTER the end-of-line from
532 } /* if (is_name_beginner(c) */
535 /* Empty statement? */
536 if (is_end_of_line[(unsigned char) c])
539 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
542 /* local label ("4:") */
543 char *backup = input_line_pointer;
545 HANDLE_CONDITIONAL_ASSEMBLY ();
549 while (isdigit (*input_line_pointer))
551 temp = (temp * 10) + *input_line_pointer - '0';
552 ++input_line_pointer;
553 } /* read the whole number */
555 #ifdef LOCAL_LABELS_DOLLAR
556 if (*input_line_pointer == '$'
557 && *(input_line_pointer + 1) == ':')
559 input_line_pointer += 2;
561 if (dollar_label_defined (temp))
563 as_fatal ("label \"%d$\" redefined", temp);
566 define_dollar_label (temp);
567 colon (dollar_label_name (temp, 0));
570 #endif /* LOCAL_LABELS_DOLLAR */
572 #ifdef LOCAL_LABELS_FB
573 if (*input_line_pointer++ == ':')
575 fb_label_instance_inc (temp);
576 colon (fb_label_name (temp, 0));
579 #endif /* LOCAL_LABELS_FB */
581 input_line_pointer = backup;
582 } /* local label ("4:") */
583 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
585 if (c && strchr (line_comment_chars, c))
586 { /* Its a comment. Better say APP or NO_APP */
590 unsigned int new_length;
592 extern char *scrub_string, *scrub_last_string;
594 bump_line_counters ();
595 s = input_line_pointer;
596 if (strncmp (s, "APP\n", 4))
597 continue; /* We ignore it */
600 ends = strstr (s, "#NO_APP\n");
604 unsigned int tmp_len;
607 /* The end of the #APP wasn't in this buffer. We
608 keep reading in buffers until we find the #NO_APP
609 that goes with this #APP There is one. The specs
611 tmp_len = buffer_limit - s;
612 tmp_buf = xmalloc (tmp_len + 1);
613 memcpy (tmp_buf, s, tmp_len);
616 new_tmp = input_scrub_next_buffer (&buffer);
620 buffer_limit = new_tmp;
621 input_line_pointer = buffer;
622 ends = strstr (buffer, "#NO_APP\n");
626 num = buffer_limit - buffer;
628 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
629 memcpy (tmp_buf, buffer + tmp_len, num);
634 input_line_pointer = ends ? ends + 8 : NULL;
642 input_line_pointer = ends + 8;
644 new_buf = xmalloc (100);
649 scrub_last_string = ends;
654 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
658 if (new_tmp == new_buf + new_length)
660 new_buf = xrealloc (new_buf, new_length + 100);
661 new_tmp = new_buf + new_length;
669 old_input = input_line_pointer;
670 old_limit = buffer_limit;
672 input_line_pointer = new_buf;
673 buffer_limit = new_tmp;
677 HANDLE_CONDITIONAL_ASSEMBLY ();
679 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
680 input_line_pointer--; /* Report unknown char as ignored. */
681 ignore_rest_of_line ();
682 } /* while (input_line_pointer<buffer_limit) */
685 bump_line_counters ();
689 input_line_pointer = old_input;
690 buffer_limit = old_limit;
695 } /* while (more buffers to scan) */
696 input_scrub_close (); /* Close the input file */
698 } /* read_a_source_file() */
704 as_fatal (".abort detected. Abandoning ship.");
707 /* For machines where ".align 4" means align to a 4 byte boundary. */
712 register unsigned int temp;
713 register long temp_fill;
715 unsigned long max_alignment = 1 << 15;
717 if (is_end_of_line[(unsigned char) *input_line_pointer])
718 temp = arg; /* Default value from pseudo-op table */
720 temp = get_absolute_expression ();
722 if (temp > max_alignment)
724 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
728 * For the sparc, `.align (1<<n)' actually means `.align n'
729 * so we have to convert it.
733 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
737 as_bad ("Alignment not a power of 2");
740 if (*input_line_pointer == ',')
742 input_line_pointer++;
743 temp_fill = get_absolute_expression ();
745 else if (now_seg != data_section && now_seg != bss_section)
746 temp_fill = NOP_OPCODE;
749 /* Only make a frag if we HAVE to. . . */
750 if (temp && !need_pass_2)
751 frag_align ((int) temp, (int) temp_fill);
753 record_alignment (now_seg, (int) temp);
755 demand_empty_rest_of_line ();
756 } /* s_align_bytes() */
758 /* For machines where ".align 4" means align to 2**4 boundary. */
760 s_align_ptwo (ignore)
764 register long temp_fill;
765 long max_alignment = 15;
767 temp = get_absolute_expression ();
768 if (temp > max_alignment)
769 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
772 as_bad ("Alignment negative. 0 assumed.");
775 if (*input_line_pointer == ',')
777 input_line_pointer++;
778 temp_fill = get_absolute_expression ();
780 /* @@ Fix this right for BFD! */
781 else if (now_seg != data_section && now_seg != bss_section)
782 temp_fill = NOP_OPCODE;
785 /* Only make a frag if we HAVE to. . . */
786 if (temp && !need_pass_2)
787 frag_align (temp, (int) temp_fill);
789 record_alignment (now_seg, temp);
791 demand_empty_rest_of_line ();
792 } /* s_align_ptwo() */
802 register symbolS *symbolP;
804 name = input_line_pointer;
805 c = get_symbol_end ();
806 /* just after name is now '\0' */
807 p = input_line_pointer;
810 if (*input_line_pointer != ',')
812 as_bad ("Expected comma after symbol-name: rest of line ignored.");
813 ignore_rest_of_line ();
816 input_line_pointer++; /* skip ',' */
817 if ((temp = get_absolute_expression ()) < 0)
819 as_warn (".COMMon length (%ld.) <0! Ignored.", (long) temp);
820 ignore_rest_of_line ();
824 symbolP = symbol_find_or_make (name);
826 if (S_IS_DEFINED (symbolP))
828 as_bad ("Ignoring attempt to re-define symbol");
829 ignore_rest_of_line ();
832 if (S_GET_VALUE (symbolP))
834 if (S_GET_VALUE (symbolP) != (valueT) temp)
835 as_bad ("Length of .comm \"%s\" is already %ld. Not changed to %ld.",
836 S_GET_NAME (symbolP),
837 (long) S_GET_VALUE (symbolP),
842 S_SET_VALUE (symbolP, (valueT) temp);
843 S_SET_EXTERNAL (symbolP);
846 if ( (!temp) || !flagseen['1'])
847 S_GET_OTHER(symbolP) = const_flag;
848 #endif /* not OBJ_VMS */
849 know (symbolP->sy_frag == &zero_address_frag);
850 demand_empty_rest_of_line ();
860 temp = get_absolute_expression ();
863 section = text_section;
867 section = data_section;
869 subseg_set (section, (subsegT) temp);
874 demand_empty_rest_of_line ();
877 /* Handle the .appfile pseudo-op. This is automatically generated by
878 do_scrub_next_char when a preprocessor # line comment is seen with
879 a file name. This default definition may be overridden by the
880 object or CPU specific pseudo-ops. This function is also the
881 default definition for .file; the APPFILE argument is 1 for
882 .appfile, 0 for .file. */
891 /* Some assemblers tolerate immediately following '"' */
892 if ((s = demand_copy_string (&length)) != 0)
894 /* If this is a fake .appfile, a fake newline was inserted into
895 the buffer. Passing -2 to new_logical_line tells it to
897 new_logical_line (s, appfile ? -2 : -1);
898 demand_empty_rest_of_line ();
901 listing_source_file (s);
905 c_dot_file_symbol (s);
906 #endif /* OBJ_COFF */
912 /* Handle the .appline pseudo-op. This is automatically generated by
913 do_scrub_next_char when a preprocessor # line comment is seen.
914 This default definition may be overridden by the object or CPU
915 specific pseudo-ops. */
923 /* The given number is that of the next line. */
924 l = get_absolute_expression () - 1;
925 new_logical_line ((char *) NULL, l);
928 listing_source_line (l);
930 demand_empty_rest_of_line ();
937 long temp_repeat = 0;
939 register long temp_fill = 0;
943 temp_repeat = get_absolute_expression ();
944 if (*input_line_pointer == ',')
946 input_line_pointer++;
947 temp_size = get_absolute_expression ();
948 if (*input_line_pointer == ',')
950 input_line_pointer++;
951 temp_fill = get_absolute_expression ();
954 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
955 #define BSD_FILL_SIZE_CROCK_8 (8)
956 if (temp_size > BSD_FILL_SIZE_CROCK_8)
958 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
959 temp_size = BSD_FILL_SIZE_CROCK_8;
963 as_warn ("Size negative: .fill ignored.");
966 else if (temp_repeat <= 0)
968 as_warn ("Repeat < 0, .fill ignored");
972 if (temp_size && !need_pass_2)
974 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
975 memset (p, 0, (unsigned int) temp_size);
976 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
977 * flavoured AS. The following bizzare behaviour is to be
978 * compatible with above. I guess they tried to take up to 8
979 * bytes from a 4-byte expression and they forgot to sign
980 * extend. Un*x Sux. */
981 #define BSD_FILL_SIZE_CROCK_4 (4)
982 md_number_to_chars (p, (valueT) temp_fill,
983 (temp_size > BSD_FILL_SIZE_CROCK_4
984 ? BSD_FILL_SIZE_CROCK_4
986 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
987 * but emits no error message because it seems a legal thing to do.
988 * It is a degenerate case of .fill but could be emitted by a compiler.
991 demand_empty_rest_of_line ();
1004 name = input_line_pointer;
1005 c = get_symbol_end ();
1006 symbolP = symbol_find_or_make (name);
1007 *input_line_pointer = c;
1009 S_SET_EXTERNAL (symbolP);
1012 input_line_pointer++;
1014 if (*input_line_pointer == '\n')
1019 demand_empty_rest_of_line ();
1023 s_lcomm (needs_align)
1024 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1025 (alignment); 0 if it was an ".lcomm" (2 args only) */
1028 register char *name;
1032 register symbolS *symbolP;
1033 segT current_seg = now_seg;
1034 subsegT current_subseg = now_subseg;
1035 const int max_alignment = 15;
1037 segT bss_seg = bss_section;
1039 name = input_line_pointer;
1040 c = get_symbol_end ();
1041 p = input_line_pointer;
1045 /* Accept an optional comma after the name. The comma used to be
1046 required, but Irix 5 cc does not generate it. */
1047 if (*input_line_pointer == ',')
1049 ++input_line_pointer;
1053 if (*input_line_pointer == '\n')
1055 as_bad ("Missing size expression");
1059 if ((temp = get_absolute_expression ()) < 0)
1061 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1062 ignore_rest_of_line ();
1067 #if defined (OBJ_ECOFF) || defined (OBJ_ELF)
1068 /* For MIPS ECOFF or ELF, small objects are put in .sbss. */
1069 if (temp <= bfd_get_gp_size (stdoutput))
1071 bss_seg = subseg_new (".sbss", 1);
1072 seg_info (bss_seg)->bss = 1;
1081 if (*input_line_pointer != ',')
1083 as_bad ("Expected comma after size");
1084 ignore_rest_of_line ();
1087 input_line_pointer++;
1089 if (*input_line_pointer == '\n')
1091 as_bad ("Missing alignment");
1094 align = get_absolute_expression ();
1095 if (align > max_alignment)
1097 align = max_alignment;
1098 as_warn ("Alignment too large: %d. assumed.", align);
1103 as_warn ("Alignment negative. 0 assumed.");
1105 record_alignment (bss_seg, align);
1106 } /* if needs align */
1109 symbolP = symbol_find_or_make (name);
1113 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1114 S_GET_OTHER (symbolP) == 0 &&
1115 S_GET_DESC (symbolP) == 0 &&
1116 #endif /* OBJ_AOUT or OBJ_BOUT */
1117 (S_GET_SEGMENT (symbolP) == bss_seg
1118 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1122 subseg_set (bss_seg, 1);
1125 frag_align (align, 0);
1126 /* detach from old frag */
1127 if (S_GET_SEGMENT (symbolP) == bss_seg)
1128 symbolP->sy_frag->fr_symbol = NULL;
1130 symbolP->sy_frag = frag_now;
1131 pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1135 S_SET_SEGMENT (symbolP, bss_seg);
1138 /* The symbol may already have been created with a preceding
1139 ".globl" directive -- be careful not to step on storage class
1140 in that case. Otherwise, set it to static. */
1141 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1143 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1145 #endif /* OBJ_COFF */
1149 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1152 subseg_set (current_seg, current_subseg);
1154 demand_empty_rest_of_line ();
1161 register char *name;
1165 register symbolS *symbolP;
1167 /* we permit ANY defined expression: BSD4.2 demands constants */
1168 name = input_line_pointer;
1169 c = get_symbol_end ();
1170 p = input_line_pointer;
1173 if (*input_line_pointer != ',')
1176 as_bad ("Expected comma after name \"%s\"", name);
1178 ignore_rest_of_line ();
1181 input_line_pointer++;
1183 if (exp.X_op != O_constant
1184 && exp.X_op != O_register)
1186 as_bad ("bad expression");
1187 ignore_rest_of_line ();
1191 symbolP = symbol_find_or_make (name);
1193 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1194 symbolP->sy_desc == 0) out of this test because coff doesn't have
1195 those fields, and I can't see when they'd ever be tripped. I
1196 don't think I understand why they were here so I may have
1197 introduced a bug. As recently as 1.37 didn't have this test
1198 anyway. xoxorich. */
1200 if (S_GET_SEGMENT (symbolP) == undefined_section
1201 && S_GET_VALUE (symbolP) == 0)
1203 /* The name might be an undefined .global symbol; be sure to
1204 keep the "external" bit. */
1205 S_SET_SEGMENT (symbolP,
1206 (exp.X_op == O_constant
1209 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1213 as_bad ("Symbol %s already defined", name);
1216 demand_empty_rest_of_line ();
1223 register segT segment;
1225 register long temp_fill;
1227 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1228 thing as a sub-segment-relative origin. Any absolute origin is
1229 given a warning, then assumed to be segment-relative. Any
1230 segmented origin expression ("foo+42") had better be in the right
1231 segment or the .org is ignored.
1233 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1234 we never know sub-segment sizes when we are reading code. BSD
1235 will crash trying to emit negative numbers of filler bytes in
1236 certain .orgs. We don't crash, but see as-write for that code.
1238 Don't make frag if need_pass_2==1. */
1239 segment = get_known_segmented_expression (&exp);
1240 if (*input_line_pointer == ',')
1242 input_line_pointer++;
1243 temp_fill = get_absolute_expression ();
1249 if (segment != now_seg && segment != absolute_section)
1250 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1251 segment_name (segment), segment_name (now_seg));
1252 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1253 exp.X_add_number, (char *) 0);
1255 } /* if (ok to make frag) */
1256 demand_empty_rest_of_line ();
1263 register char *name;
1264 register char delim;
1265 register char *end_name;
1266 register symbolS *symbolP;
1269 * Especial apologies for the random logic:
1270 * this just grew, and could be parsed much more simply!
1273 name = input_line_pointer;
1274 delim = get_symbol_end ();
1275 end_name = input_line_pointer;
1279 if (*input_line_pointer != ',')
1282 as_bad ("Expected comma after name \"%s\"", name);
1284 ignore_rest_of_line ();
1288 input_line_pointer++;
1291 if (name[0] == '.' && name[1] == '\0')
1293 /* Turn '. = mumble' into a .org mumble */
1294 register segT segment;
1298 segment = get_known_segmented_expression (&exp);
1302 if (segment != now_seg && segment != absolute_section)
1303 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1304 segment_name (segment),
1305 segment_name (now_seg));
1306 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1307 exp.X_add_number, (char *) 0);
1309 } /* if (ok to make frag) */
1315 if ((symbolP = symbol_find (name)) == NULL
1316 && (symbolP = md_undefined_symbol (name)) == NULL)
1318 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1320 /* "set" symbols are local unless otherwise specified. */
1321 SF_SET_LOCAL (symbolP);
1322 #endif /* OBJ_COFF */
1324 } /* make a new symbol */
1326 symbol_table_insert (symbolP);
1329 pseudo_set (symbolP);
1330 demand_empty_rest_of_line ();
1338 register long temp_fill;
1341 /* Just like .fill, but temp_size = 1 */
1342 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1344 temp_fill = get_absolute_expression ();
1348 input_line_pointer--; /* Backup over what was not a ','. */
1353 temp_repeat *= mult;
1355 if (temp_repeat <= 0)
1357 as_warn ("Repeat < 0, .space ignored");
1358 ignore_rest_of_line ();
1363 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1364 temp_repeat, (char *) 0);
1367 demand_empty_rest_of_line ();
1376 temp = get_absolute_expression ();
1377 subseg_set (text_section, (subsegT) temp);
1378 demand_empty_rest_of_line ();
1383 demand_empty_rest_of_line ()
1386 if (is_end_of_line[(unsigned char) *input_line_pointer])
1388 input_line_pointer++;
1392 ignore_rest_of_line ();
1394 /* Return having already swallowed end-of-line. */
1395 } /* Return pointing just after end-of-line. */
1398 ignore_rest_of_line () /* For suspect lines: gives warning. */
1400 if (!is_end_of_line[(unsigned char) *input_line_pointer])
1402 if (isprint (*input_line_pointer))
1403 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1404 *input_line_pointer);
1406 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1407 *input_line_pointer);
1408 while (input_line_pointer < buffer_limit
1409 && !is_end_of_line[(unsigned char) *input_line_pointer])
1411 input_line_pointer++;
1414 input_line_pointer++; /* Return pointing just after end-of-line. */
1415 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
1421 * In: Pointer to a symbol.
1422 * Input_line_pointer->expression.
1424 * Out: Input_line_pointer->just after any whitespace after expression.
1425 * Tried to set symbol to value of expression.
1426 * Will change symbols type, value, and frag;
1429 pseudo_set (symbolP)
1433 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1435 #endif /* OBJ_AOUT or OBJ_BOUT */
1437 know (symbolP); /* NULL pointer is logic error. */
1438 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1439 /* @@ Fix this right for BFD. */
1440 ext = S_IS_EXTERNAL (symbolP);
1441 #endif /* OBJ_AOUT or OBJ_BOUT */
1443 (void) expression (&exp);
1445 if (exp.X_op == O_illegal)
1446 as_bad ("illegal expression; zero assumed");
1447 else if (exp.X_op == O_absent)
1448 as_bad ("missing expression; zero assumed");
1449 else if (exp.X_op == O_big)
1450 as_bad ("%s number invalid; zero assumed",
1451 exp.X_add_number > 0 ? "bignum" : "floating point");
1452 else if (exp.X_op == O_subtract
1453 && (S_GET_SEGMENT (exp.X_add_symbol)
1454 == S_GET_SEGMENT (exp.X_op_symbol))
1455 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
1456 && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
1458 exp.X_op = O_constant;
1459 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
1460 - S_GET_VALUE (exp.X_op_symbol));
1468 exp.X_add_number = 0;
1471 S_SET_SEGMENT (symbolP, absolute_section);
1472 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1473 /* @@ Fix this right for BFD. */
1475 S_SET_EXTERNAL (symbolP);
1477 S_CLEAR_EXTERNAL (symbolP);
1478 #endif /* OBJ_AOUT or OBJ_BOUT */
1479 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1480 symbolP->sy_frag = &zero_address_frag;
1484 S_SET_SEGMENT (symbolP, reg_section);
1485 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1486 symbolP->sy_frag = &zero_address_frag;
1490 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section)
1491 symbolP->sy_value = exp;
1494 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (exp.X_add_symbol));
1495 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1496 /* @@ Fix this right for BFD! */
1498 S_SET_EXTERNAL (symbolP);
1500 S_CLEAR_EXTERNAL (symbolP);
1501 #endif /* OBJ_AOUT or OBJ_BOUT */
1502 S_SET_VALUE (symbolP,
1503 exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1504 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1509 /* The value is some complex expression.
1510 FIXME: Should we set the segment to anything? */
1511 symbolP->sy_value = exp;
1519 * CONStruct more frag of .bytes, or .words etc.
1520 * Should need_pass_2 be 1 then emit no frag(s).
1521 * This understands EXPRESSIONS.
1525 * This has a split personality. We use expression() to read the
1526 * value. We can detect if the value won't fit in a byte or word.
1527 * But we can't detect if expression() discarded significant digits
1528 * in the case of a long. Not worth the crocks required to fix it.
1531 /* Select a parser for cons expressions. */
1533 /* Some targets need to parse the expression in various fancy ways.
1534 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1535 (for example, the HPPA does this). Otherwise, you can define
1536 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1537 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1538 are defined, which is the normal case, then only simple expressions
1541 #ifndef TC_PARSE_CONS_EXPRESSION
1542 #ifdef BITFIELD_CONS_EXPRESSIONS
1543 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1545 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1548 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1550 parse_mri_cons PARAMS ((expressionS *exp));
1552 #ifdef REPEAT_CONS_EXPRESSIONS
1553 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1555 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1558 /* If we haven't gotten one yet, just call expression. */
1559 #ifndef TC_PARSE_CONS_EXPRESSION
1560 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1564 /* worker to do .byte etc statements */
1565 /* clobbers input_line_pointer, checks */
1569 register int nbytes; /* 1=.byte, 2=.word, 4=.long */
1573 if (is_it_end_of_statement ())
1575 demand_empty_rest_of_line ();
1581 TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
1582 emit_expr (&exp, (unsigned int) nbytes);
1584 while (*input_line_pointer++ == ',');
1586 input_line_pointer--; /* Put terminator back into stream. */
1587 demand_empty_rest_of_line ();
1590 /* Put the contents of expression EXP into the object file using
1591 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1594 emit_expr (exp, nbytes)
1596 unsigned int nbytes;
1600 valueT extra_digit = 0;
1602 /* Don't do anything if we are going to make another pass. */
1608 /* Handle a negative bignum. */
1610 && exp->X_add_number == 0
1611 && exp->X_add_symbol->sy_value.X_op == O_big
1612 && exp->X_add_symbol->sy_value.X_add_number > 0)
1615 unsigned long carry;
1617 exp = &exp->X_add_symbol->sy_value;
1619 /* Negate the bignum: one's complement each digit and add 1. */
1621 for (i = 0; i < exp->X_add_number; i++)
1625 next = (((~ (generic_bignum[i] & LITTLENUM_MASK))
1628 generic_bignum[i] = next & LITTLENUM_MASK;
1629 carry = next >> LITTLENUM_NUMBER_OF_BITS;
1632 /* We can ignore any carry out, because it will be handled by
1633 extra_digit if it is needed. */
1635 extra_digit = (valueT) -1;
1639 if (op == O_absent || op == O_illegal)
1641 as_warn ("zero assumed for missing expression");
1642 exp->X_add_number = 0;
1645 else if (op == O_big && exp->X_add_number <= 0)
1647 as_bad ("floating point number invalid; zero assumed");
1648 exp->X_add_number = 0;
1651 else if (op == O_register)
1653 as_warn ("register value used as expression");
1657 p = frag_more ((int) nbytes);
1659 #ifndef WORKING_DOT_WORD
1660 /* If we have the difference of two symbols in a word, save it on
1661 the broken_words list. See the code in write.c. */
1662 if (op == O_subtract && nbytes == 2)
1664 struct broken_word *x;
1666 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1667 x->next_broken_word = broken_words;
1670 x->word_goes_here = p;
1672 x->add = exp->X_add_symbol;
1673 x->sub = exp->X_op_symbol;
1674 x->addnum = exp->X_add_number;
1681 /* If we have an integer, but the number of bytes is too large to
1682 pass to md_number_to_chars, handle it as a bignum. */
1683 if (op == O_constant && nbytes > sizeof (valueT))
1688 if (! exp->X_unsigned && exp->X_add_number < 0)
1689 extra_digit = (valueT) -1;
1690 val = (valueT) exp->X_add_number;
1694 generic_bignum[gencnt] = val & LITTLENUM_MASK;
1695 val >>= LITTLENUM_NUMBER_OF_BITS;
1699 op = exp->X_op = O_big;
1700 exp->X_add_number = gencnt;
1703 if (op == O_constant)
1708 register long unmask;
1710 /* JF << of >= number of bits in the object is undefined. In
1711 particular SPARC (Sun 4) has problems */
1712 if (nbytes >= sizeof (long))
1715 mask = ~0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1717 unmask = ~mask; /* Do store these bits. */
1720 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1721 mask = ~(unmask >> 1); /* Includes sign bit now. */
1724 get = exp->X_add_number;
1726 if ((get & mask) != 0 && (get & mask) != mask)
1727 { /* Leading bits contain both 0s & 1s. */
1728 as_warn ("Value 0x%lx truncated to 0x%lx.", get, use);
1730 /* put bytes in right order. */
1731 md_number_to_chars (p, (valueT) use, (int) nbytes);
1733 else if (op == O_big)
1736 LITTLENUM_TYPE *nums;
1738 know (nbytes % CHARS_PER_LITTLENUM == 0);
1740 size = exp->X_add_number * CHARS_PER_LITTLENUM;
1743 as_warn ("Bignum truncated to %d bytes", nbytes);
1747 if (target_big_endian)
1749 while (nbytes > size)
1751 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1752 nbytes -= CHARS_PER_LITTLENUM;
1753 p += CHARS_PER_LITTLENUM;
1756 nums = generic_bignum + size / CHARS_PER_LITTLENUM;
1760 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1761 size -= CHARS_PER_LITTLENUM;
1762 p += CHARS_PER_LITTLENUM;
1767 nums = generic_bignum;
1770 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1772 size -= CHARS_PER_LITTLENUM;
1773 p += CHARS_PER_LITTLENUM;
1774 nbytes -= CHARS_PER_LITTLENUM;
1779 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1780 nbytes -= CHARS_PER_LITTLENUM;
1781 p += CHARS_PER_LITTLENUM;
1787 md_number_to_chars (p, (valueT) 0, (int) nbytes);
1789 /* Now we need to generate a fixS to record the symbol value.
1790 This is easy for BFD. For other targets it can be more
1791 complex. For very complex cases (currently, the HPPA and
1792 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1793 want. For simpler cases, you can define TC_CONS_RELOC to be
1794 the name of the reloc code that should be stored in the fixS.
1795 If neither is defined, the code uses NO_RELOC if it is
1796 defined, and otherwise uses 0. */
1798 #ifdef BFD_ASSEMBLER
1799 #ifdef TC_CONS_FIX_NEW
1800 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1802 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1803 /* @@ Should look at CPU word size. */
1804 nbytes == 2 ? BFD_RELOC_16
1805 : nbytes == 8 ? BFD_RELOC_64
1809 #ifdef TC_CONS_FIX_NEW
1810 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1812 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1813 it is defined, otherwise use NO_RELOC if it is defined,
1815 #ifndef TC_CONS_RELOC
1817 #define TC_CONS_RELOC NO_RELOC
1819 #define TC_CONS_RELOC 0
1822 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1824 #endif /* TC_CONS_FIX_NEW */
1825 #endif /* BFD_ASSEMBLER */
1829 #ifdef BITFIELD_CONS_EXPRESSIONS
1831 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1832 w:x,y:z, where w and y are bitwidths and x and y are values. They
1833 then pack them all together. We do a little better in that we allow
1834 them in words, longs, etc. and we'll pack them in target byte order
1837 The rules are: pack least significat bit first, if a field doesn't
1838 entirely fit, put it in the next unit. Overflowing the bitfield is
1839 explicitly *not* even a warning. The bitwidth should be considered
1842 To use this function the tc-XXX.h file should define
1843 BITFIELD_CONS_EXPRESSIONS. */
1846 parse_bitfield_cons (exp, nbytes)
1848 unsigned int nbytes;
1850 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1851 char *hold = input_line_pointer;
1853 (void) expression (exp);
1855 if (*input_line_pointer == ':')
1861 unsigned long width;
1863 if (*input_line_pointer != ':')
1865 input_line_pointer = hold;
1867 } /* next piece is not a bitfield */
1869 /* In the general case, we can't allow
1870 full expressions with symbol
1871 differences and such. The relocation
1872 entries for symbols not defined in this
1873 assembly would require arbitrary field
1874 widths, positions, and masks which most
1875 of our current object formats don't
1878 In the specific case where a symbol
1879 *is* defined in this assembly, we
1880 *could* build fixups and track it, but
1881 this could lead to confusion for the
1882 backends. I'm lazy. I'll take any
1883 SEG_ABSOLUTE. I think that means that
1884 you can use a previous .set or
1885 .equ type symbol. xoxorich. */
1887 if (exp->X_op == O_absent)
1889 as_warn ("using a bit field width of zero");
1890 exp->X_add_number = 0;
1891 exp->X_op = O_constant;
1892 } /* implied zero width bitfield */
1894 if (exp->X_op != O_constant)
1896 *input_line_pointer = '\0';
1897 as_bad ("field width \"%s\" too complex for a bitfield", hold);
1898 *input_line_pointer = ':';
1899 demand_empty_rest_of_line ();
1903 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1905 as_warn ("field width %lu too big to fit in %d bytes: truncated to %d bits",
1906 width, nbytes, (BITS_PER_CHAR * nbytes));
1907 width = BITS_PER_CHAR * nbytes;
1910 if (width > bits_available)
1912 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1913 input_line_pointer = hold;
1914 exp->X_add_number = value;
1918 hold = ++input_line_pointer; /* skip ':' */
1920 (void) expression (exp);
1921 if (exp->X_op != O_constant)
1923 char cache = *input_line_pointer;
1925 *input_line_pointer = '\0';
1926 as_bad ("field value \"%s\" too complex for a bitfield", hold);
1927 *input_line_pointer = cache;
1928 demand_empty_rest_of_line ();
1932 value |= ((~(-1 << width) & exp->X_add_number)
1933 << ((BITS_PER_CHAR * nbytes) - bits_available));
1935 if ((bits_available -= width) == 0
1936 || is_it_end_of_statement ()
1937 || *input_line_pointer != ',')
1940 } /* all the bitfields we're gonna get */
1942 hold = ++input_line_pointer;
1943 (void) expression (exp);
1944 } /* forever loop */
1946 exp->X_add_number = value;
1947 exp->X_op = O_constant;
1948 exp->X_unsigned = 1;
1949 } /* if looks like a bitfield */
1950 } /* parse_bitfield_cons() */
1952 #endif /* BITFIELD_CONS_EXPRESSIONS */
1957 parse_mri_cons (exp, nbytes)
1959 unsigned int nbytes;
1961 if (*input_line_pointer == '\'')
1963 /* An MRI style string, cut into as many bytes as will fit into
1964 a nbyte chunk, left justify if necessary, and separate with
1965 commas so we can try again later */
1967 unsigned int result = 0;
1968 input_line_pointer++;
1969 for (scan = 0; scan < nbytes; scan++)
1971 if (*input_line_pointer == '\'')
1973 if (input_line_pointer[1] == '\'')
1975 input_line_pointer++;
1980 result = (result << 8) | (*input_line_pointer++);
1984 while (scan < nbytes)
1989 /* Create correct expression */
1990 exp->X_op = O_constant;
1991 exp->X_add_number = result;
1992 /* Fake it so that we can read the next char too */
1993 if (input_line_pointer[0] != '\'' ||
1994 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
1996 input_line_pointer -= 2;
1997 input_line_pointer[0] = ',';
1998 input_line_pointer[1] = '\'';
2001 input_line_pointer++;
2009 #ifdef REPEAT_CONS_EXPRESSIONS
2011 /* Parse a repeat expression for cons. This is used by the MIPS
2012 assembler. The format is NUMBER:COUNT; NUMBER appears in the
2013 object file COUNT times.
2015 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
2018 parse_repeat_cons (exp, nbytes)
2020 unsigned int nbytes;
2027 if (*input_line_pointer != ':')
2029 /* No repeat count. */
2033 ++input_line_pointer;
2034 expression (&count);
2035 if (count.X_op != O_constant
2036 || count.X_add_number <= 0)
2038 as_warn ("Unresolvable or nonpositive repeat count; using 1");
2042 /* The cons function is going to output this expression once. So we
2043 output it count - 1 times. */
2044 for (i = count.X_add_number - 1; i > 0; i--)
2045 emit_expr (exp, nbytes);
2048 #endif /* REPEAT_CONS_EXPRESSIONS */
2053 * CONStruct some more frag chars of .floats .ffloats etc.
2054 * Makes 0 or more new frags.
2055 * If need_pass_2 == 1, no frags are emitted.
2056 * This understands only floating literals, not expressions. Sorry.
2058 * A floating constant is defined by atof_generic(), except it is preceded
2059 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2060 * reading, I decided to be incompatible. This always tries to give you
2061 * rounded bits to the precision of the pseudo-op. Former AS did premature
2062 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2063 * a choice of 2 flavours of noise according to which of 2 floating-point
2064 * scanners you directed AS to use.
2066 * In: input_line_pointer->whitespace before, or '0' of flonum.
2071 float_cons (float_type)
2072 /* Clobbers input_line-pointer, checks end-of-line. */
2073 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2076 int length; /* Number of chars in an object. */
2077 register char *err; /* Error from scanning floating literal. */
2078 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2080 if (is_it_end_of_statement ())
2082 demand_empty_rest_of_line ();
2088 /* input_line_pointer->1st char of a flonum (we hope!). */
2091 /* Skip any 0{letter} that may be present. Don't even check if the
2092 * letter is legal. Someone may invent a "z" format and this routine
2093 * has no use for such information. Lusers beware: you get
2094 * diagnostics if your input is ill-conditioned.
2096 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2097 input_line_pointer += 2;
2099 err = md_atof (float_type, temp, &length);
2100 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2104 as_bad ("Bad floating literal: %s", err);
2105 ignore_rest_of_line ();
2115 #ifdef REPEAT_CONS_EXPRESSIONS
2116 if (*input_line_pointer == ':')
2118 expressionS count_exp;
2120 ++input_line_pointer;
2121 expression (&count_exp);
2122 if (count_exp.X_op != O_constant
2123 || count_exp.X_add_number <= 0)
2125 as_warn ("unresolvable or nonpositive repeat count; using 1");
2128 count = count_exp.X_add_number;
2132 while (--count >= 0)
2134 p = frag_more (length);
2135 memcpy (p, temp, (unsigned int) length);
2140 while (*input_line_pointer++ == ',');
2142 --input_line_pointer; /* Put terminator back into stream. */
2143 demand_empty_rest_of_line ();
2144 } /* float_cons() */
2149 * We read 0 or more ',' seperated, double-quoted strings.
2151 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2156 stringer (append_zero) /* Worker to do .ascii etc statements. */
2157 /* Checks end-of-line. */
2158 register int append_zero; /* 0: don't append '\0', else 1 */
2160 register unsigned int c;
2163 * The following awkward logic is to parse ZERO or more strings,
2164 * comma seperated. Recall a string expression includes spaces
2165 * before the opening '\"' and spaces after the closing '\"'.
2166 * We fake a leading ',' if there is (supposed to be)
2167 * a 1st, expression. We keep demanding expressions for each
2170 if (is_it_end_of_statement ())
2172 c = 0; /* Skip loop. */
2173 ++input_line_pointer; /* Compensate for end of loop. */
2177 c = ','; /* Do loop. */
2179 while (c == ',' || c == '<' || c == '"')
2182 switch (*input_line_pointer)
2185 ++input_line_pointer; /*->1st char of string. */
2186 while (is_a_char (c = next_char_of_string ()))
2188 FRAG_APPEND_1_CHAR (c);
2192 FRAG_APPEND_1_CHAR (0);
2194 know (input_line_pointer[-1] == '\"');
2197 input_line_pointer++;
2198 c = get_single_number ();
2199 FRAG_APPEND_1_CHAR (c);
2200 if (*input_line_pointer != '>')
2202 as_bad ("Expected <nn>");
2204 input_line_pointer++;
2207 input_line_pointer++;
2211 c = *input_line_pointer;
2214 demand_empty_rest_of_line ();
2217 /* FIXME-SOMEDAY: I had trouble here on characters with the
2218 high bits set. We'll probably also have trouble with
2219 multibyte chars, wide chars, etc. Also be careful about
2220 returning values bigger than 1 byte. xoxorich. */
2223 next_char_of_string ()
2225 register unsigned int c;
2227 c = *input_line_pointer++ & CHAR_MASK;
2235 switch (c = *input_line_pointer++)
2265 break; /* As itself. */
2281 for (i = 0, number = 0; isdigit (c) && i < 3; c = *input_line_pointer++, i++)
2283 number = number * 8 + c - '0';
2287 --input_line_pointer;
2296 c = *input_line_pointer++;
2297 while (isxdigit (c))
2300 number = number * 16 + c - '0';
2301 else if (isupper (c))
2302 number = number * 16 + c - 'A' + 10;
2304 number = number * 16 + c - 'a' + 10;
2305 c = *input_line_pointer++;
2308 --input_line_pointer;
2313 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2314 as_warn ("Unterminated string: Newline inserted.");
2320 #ifdef ONLY_STANDARD_ESCAPES
2321 as_bad ("Bad escaped character in string, '?' assumed");
2323 #endif /* ONLY_STANDARD_ESCAPES */
2326 } /* switch on escaped char */
2331 } /* switch on char */
2333 } /* next_char_of_string() */
2336 get_segmented_expression (expP)
2337 register expressionS *expP;
2339 register segT retval;
2341 retval = expression (expP);
2342 if (expP->X_op == O_illegal
2343 || expP->X_op == O_absent
2344 || expP->X_op == O_big)
2346 as_bad ("expected address expression; zero assumed");
2347 expP->X_op = O_constant;
2348 expP->X_add_number = 0;
2349 retval = absolute_section;
2355 get_known_segmented_expression (expP)
2356 register expressionS *expP;
2358 register segT retval;
2360 if ((retval = get_segmented_expression (expP)) == undefined_section)
2362 /* There is no easy way to extract the undefined symbol from the
2364 if (expP->X_add_symbol != NULL
2365 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
2366 as_warn ("symbol \"%s\" undefined; zero assumed",
2367 S_GET_NAME (expP->X_add_symbol));
2369 as_warn ("some symbol undefined; zero assumed");
2370 retval = absolute_section;
2371 expP->X_op = O_constant;
2372 expP->X_add_number = 0;
2374 know (retval == absolute_section || SEG_NORMAL (retval));
2376 } /* get_known_segmented_expression() */
2379 get_absolute_expression ()
2384 if (exp.X_op != O_constant)
2386 if (exp.X_op != O_absent)
2387 as_bad ("bad absolute expression; zero assumed");
2388 exp.X_add_number = 0;
2390 return exp.X_add_number;
2393 char /* return terminator */
2394 get_absolute_expression_and_terminator (val_pointer)
2395 long *val_pointer; /* return value of expression */
2397 /* FIXME: val_pointer should probably be offsetT *. */
2398 *val_pointer = (long) get_absolute_expression ();
2399 return (*input_line_pointer++);
2403 * demand_copy_C_string()
2405 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2406 * Give a warning if that happens.
2409 demand_copy_C_string (len_pointer)
2414 if ((s = demand_copy_string (len_pointer)) != 0)
2418 for (len = *len_pointer;
2427 as_bad ("This string may not contain \'\\0\'");
2435 * demand_copy_string()
2437 * Demand string, but return a safe (=private) copy of the string.
2438 * Return NULL if we can't read a string here.
2441 demand_copy_string (lenP)
2444 register unsigned int c;
2450 if (*input_line_pointer == '\"')
2452 input_line_pointer++; /* Skip opening quote. */
2454 while (is_a_char (c = next_char_of_string ()))
2456 obstack_1grow (¬es, c);
2459 /* JF this next line is so demand_copy_C_string will return a null
2460 termanated string. */
2461 obstack_1grow (¬es, '\0');
2462 retval = obstack_finish (¬es);
2466 as_warn ("Missing string");
2468 ignore_rest_of_line ();
2472 } /* demand_copy_string() */
2475 * is_it_end_of_statement()
2477 * In: Input_line_pointer->next character.
2479 * Do: Skip input_line_pointer over all whitespace.
2481 * Out: 1 if input_line_pointer->end-of-line.
2484 is_it_end_of_statement ()
2487 return (is_end_of_line[(unsigned char) *input_line_pointer]);
2488 } /* is_it_end_of_statement() */
2494 register symbolS *symbolP; /* symbol we are working with */
2496 input_line_pointer++;
2497 if (*input_line_pointer == '=')
2498 input_line_pointer++;
2500 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2501 input_line_pointer++;
2503 if (sym_name[0] == '.' && sym_name[1] == '\0')
2505 /* Turn '. = mumble' into a .org mumble */
2506 register segT segment;
2510 segment = get_known_segmented_expression (&exp);
2513 if (segment != now_seg && segment != absolute_section)
2514 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2515 segment_name (segment),
2516 segment_name (now_seg));
2517 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2518 exp.X_add_number, (char *) 0);
2520 } /* if (ok to make frag) */
2524 symbolP = symbol_find_or_make (sym_name);
2525 pseudo_set (symbolP);
2529 /* .include -- include a file at this point. */
2542 filename = demand_copy_string (&i);
2543 demand_empty_rest_of_line ();
2544 path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
2545 for (i = 0; i < include_dir_count; i++)
2547 strcpy (path, include_dirs[i]);
2549 strcat (path, filename);
2550 if (0 != (try = fopen (path, FOPEN_RT)))
2559 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2560 newbuf = input_scrub_include_file (path, input_line_pointer);
2561 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2565 add_include_dir (path)
2570 if (include_dir_count == 0)
2572 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2573 include_dirs[0] = "."; /* Current dir */
2574 include_dir_count = 2;
2578 include_dir_count++;
2579 include_dirs = (char **) realloc (include_dirs,
2580 include_dir_count * sizeof (*include_dirs));
2583 include_dirs[include_dir_count - 1] = path; /* New one */
2586 if (i > include_dir_maxlen)
2587 include_dir_maxlen = i;
2588 } /* add_include_dir() */
2594 while (!is_end_of_line[(unsigned char) *input_line_pointer])
2596 ++input_line_pointer;
2598 ++input_line_pointer;