1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991 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. */
51 #ifndef TC_START_LABEL
52 #define TC_START_LABEL(x,y) (x==':')
55 /* The NOP_OPCODE is for the alignment fill value.
56 * fill it a nop instruction so that the disassembler does not choke
60 #define NOP_OPCODE 0x00
63 char *input_line_pointer; /*->next char of source file to parse. */
65 #if BITS_PER_CHAR != 8
66 /* The following table is indexed by[(char)] and will break if
67 a char does not have exactly 256 states (hopefully 0:255!)! */
71 /* used by is_... macros. our ctype[] */
72 const char lex_type[256] =
74 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
75 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
76 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
77 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
78 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
79 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
80 0, 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, 0, /* pqrstuvwxyz{|}~. */
82 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
83 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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,
94 * Out: 1 if this character ends a line.
97 char is_end_of_line[256] =
100 _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
102 _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
104 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
106 _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
107 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
109 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
110 _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
112 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
113 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
114 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
115 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
116 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
117 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
118 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
119 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
120 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
124 /* Functions private to this file. */
126 static char *buffer; /* 1st char of each buffer of lines is here. */
127 static char *buffer_limit; /*->1 + last char in buffer. */
129 static char *bignum_low; /* Lowest char of bignum. */
130 static char *bignum_limit; /* 1st illegal address of bignum. */
131 static char *bignum_high; /* Highest char of bignum. */
132 /* May point to (bignum_start-1). */
133 /* Never >= bignum_limit. */
135 int target_big_endian;
137 static char *old_buffer; /* JF a hack */
138 static char *old_input;
139 static char *old_limit;
141 /* Variables for handling include file directory list. */
143 char **include_dirs; /* List of pointers to directories to
144 search for .include's */
145 int include_dir_count; /* How many are in the list */
146 int include_dir_maxlen = 1;/* Length of longest in list */
148 #ifndef WORKING_DOT_WORD
149 struct broken_word *broken_words;
150 int new_broken_words;
153 static char *demand_copy_string PARAMS ((int *lenP));
154 int is_it_end_of_statement PARAMS ((void));
155 unsigned int next_char_of_string PARAMS ((void));
156 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
157 static void grow_bignum PARAMS ((void));
158 static void pobegin PARAMS ((void));
169 obj_read_begin_hook ();
171 obstack_begin (¬es, 5000);
172 obstack_begin (&cond_obstack, 960);
174 #define BIGNUM_BEGIN_SIZE (16)
175 bignum_low = xmalloc ((long) BIGNUM_BEGIN_SIZE);
176 bignum_limit = bignum_low + BIGNUM_BEGIN_SIZE;
178 /* Use machine dependent syntax */
179 for (p = line_separator_chars; *p; p++)
180 is_end_of_line[*p] = 1;
181 /* Use more. FIXME-SOMEDAY. */
184 /* set up pseudo-op tables */
186 struct hash_control *po_hash;
188 static const pseudo_typeS potable[] =
190 {"abort", s_abort, 0},
191 {"align", s_align_ptwo, 0},
192 {"ascii", stringer, 0},
193 {"asciz", stringer, 1},
199 {"double", float_cons, 'd'},
201 {"eject", listing_eject, 0}, /* Formfeed listing */
204 {"endif", s_endif, 0},
209 {"extern", s_ignore, 0}, /* We treat all undef as ext */
210 {"appfile", s_app_file, 1},
211 {"appline", s_app_line, 0},
212 {"file", s_app_file, 0},
214 {"float", float_cons, 'f'},
215 {"global", s_globl, 0},
216 {"globl", s_globl, 0},
219 {"ifdef", s_ifdef, 0},
220 {"ifeqs", s_ifeqs, 0},
221 {"ifndef", s_ifdef, 1},
222 {"ifnes", s_ifeqs, 1},
223 {"ifnotdef", s_ifdef, 1},
224 {"include", s_include, 0},
226 {"lcomm", s_lcomm, 0},
227 {"lflags", listing_flags, 0}, /* Listing flags */
228 {"list", listing_list, 1}, /* Turn listing on */
231 {"nolist", listing_list, 0}, /* Turn listing off */
232 {"octa", big_cons, 16},
234 {"psize", listing_psize, 0}, /* set paper size */
236 {"quad", big_cons, 8},
237 {"sbttl", listing_title, 1}, /* Subtitle of listing */
242 {"single", float_cons, 'f'},
244 {"space", s_space, 0},
247 {"title", listing_title, 0}, /* Listing title */
252 {NULL} /* end sentinel */
258 char *errtxt; /* error text */
259 const pseudo_typeS *pop;
261 po_hash = hash_new ();
263 /* Do the target-specific pseudo ops. */
264 for (pop = md_pseudo_table; pop->poc_name; pop++)
266 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
267 if (errtxt && *errtxt)
269 as_fatal ("error constructing md pseudo-op table");
273 /* Now object specific. Skip any that were in the target table. */
274 for (pop = obj_pseudo_table; pop->poc_name; pop++)
276 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
277 if (errtxt && *errtxt)
279 if (!strcmp (errtxt, "exists"))
281 #ifdef DIE_ON_OVERRIDES
282 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
283 #endif /* DIE_ON_OVERRIDES */
284 continue; /* OK if target table overrides. */
288 as_fatal ("error constructing obj pseudo-op table");
289 } /* if overridden */
293 /* Now portable ones. Skip any that we've seen already. */
294 for (pop = potable; pop->poc_name; pop++)
296 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
297 if (errtxt && *errtxt)
299 if (!strcmp (errtxt, "exists"))
301 #ifdef DIE_ON_OVERRIDES
302 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
303 #endif /* DIE_ON_OVERRIDES */
304 continue; /* OK if target table overrides. */
308 as_fatal ("error constructing obj pseudo-op table");
309 } /* if overridden */
316 #define HANDLE_CONDITIONAL_ASSEMBLY() \
317 if (ignore_input ()) \
319 while (! is_end_of_line[*input_line_pointer++]) \
320 if (input_line_pointer == buffer_limit) \
326 /* read_a_source_file()
328 * We read the file, putting things into a web that
329 * represents what we have been reading.
332 read_a_source_file (name)
336 register char *s; /* string of symbol, '\0' appended */
340 buffer = input_scrub_new_file (name);
343 listing_newline ("");
345 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
346 { /* We have another line to parse. */
347 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
348 contin: /* JF this goto is my fault I admit it.
349 Someone brave please re-write the whole
350 input section here? Pleeze??? */
351 while (input_line_pointer < buffer_limit)
353 /* We have more of this buffer to parse. */
356 * We now have input_line_pointer->1st char of next line.
357 * If input_line_pointer [-1] == '\n' then we just
358 * scanned another line: so bump line counters.
360 if (input_line_pointer[-1] == '\n')
362 bump_line_counters ();
365 /* Text at the start of a line must be a label, we run down and stick a colon in */
366 if (is_name_beginner (*input_line_pointer))
368 char *line_start = input_line_pointer;
369 char c = get_symbol_end ();
371 *input_line_pointer = c;
373 input_line_pointer++;
381 * We are at the begining of a line, or similar place.
382 * We expect a well-formed assembler statement.
383 * A "symbol-name:" is a statement.
385 * Depending on what compiler is used, the order of these tests
386 * may vary to catch most common case 1st.
387 * Each test is independent of all other tests at the (top) level.
388 * PLEASE make a compiler that doesn't use this assembler.
389 * It is crufty to waste a compiler's time encoding things for this
390 * assembler, which then wastes more time decoding it.
391 * (And communicating via (linear) files is silly!
392 * If you must pass stuff, please pass a tree!)
394 if ((c = *input_line_pointer++) == '\t'
399 c = *input_line_pointer++;
401 know (c != ' '); /* No further leading whitespace. */
404 * C is the 1st significant character.
405 * Input_line_pointer points after that character.
407 if (is_name_beginner (c))
408 { /* want user-defined label or pseudo/opcode */
409 HANDLE_CONDITIONAL_ASSEMBLY ();
411 s = --input_line_pointer;
412 c = get_symbol_end (); /* name's delimiter */
414 * C is character after symbol.
415 * That character's place in the input line is now '\0'.
416 * S points to the beginning of the symbol.
417 * [In case of pseudo-op, s->'.'.]
418 * Input_line_pointer->'\0' where c was.
420 if (TC_START_LABEL(c, input_line_pointer))
422 colon (s); /* user-defined label */
423 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
424 /* Input_line_pointer->after ':'. */
429 else if (c == '=' || input_line_pointer[1] == '=')
432 demand_empty_rest_of_line ();
435 { /* expect pseudo-op or machine instruction */
437 if (!done_pseudo (s))
445 * WARNING: c has next char, which may be end-of-line.
446 * We lookup the pseudo-op table with s+1 because we
447 * already know that the pseudo-op begins with a '.'.
450 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
452 /* Print the error msg now, while we still can */
455 as_bad ("Unknown pseudo-op: `%s'", s);
456 *input_line_pointer = c;
461 /* Put it back for error messages etc. */
462 *input_line_pointer = c;
463 /* The following skip of whitespace is compulsory.
464 A well shaped space is sometimes all that separates
465 keyword from operands. */
466 if (c == ' ' || c == '\t')
468 input_line_pointer++;
469 } /* Skip seperator after keyword. */
471 * Input_line is restored.
472 * Input_line_pointer->1st non-blank char
473 * after pseudo-operation.
477 ignore_rest_of_line ();
482 (*pop->poc_handler) (pop->poc_val);
483 } /* if we have one */
487 { /* machine instruction */
488 /* WARNING: c has char, which may be end-of-line. */
489 /* Also: input_line_pointer->`\0` where c was. */
490 *input_line_pointer = c;
491 while (!is_end_of_line[*input_line_pointer])
493 input_line_pointer++;
496 c = *input_line_pointer;
497 *input_line_pointer = '\0';
499 md_assemble (s); /* Assemble 1 instruction. */
501 *input_line_pointer++ = c;
503 /* We resume loop AFTER the end-of-line from this instruction */
508 } /* if (is_name_beginner(c) */
511 if (is_end_of_line[c])
514 } /* empty statement */
517 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
519 { /* local label ("4:") */
520 char *backup = input_line_pointer;
522 HANDLE_CONDITIONAL_ASSEMBLY ();
526 while (isdigit (*input_line_pointer))
528 temp = (temp * 10) + *input_line_pointer - '0';
529 ++input_line_pointer;
530 } /* read the whole number */
532 #ifdef LOCAL_LABELS_DOLLAR
533 if (*input_line_pointer == '$'
534 && *(input_line_pointer + 1) == ':')
536 input_line_pointer += 2;
538 if (dollar_label_defined (temp))
540 as_fatal ("label \"%d$\" redefined", temp);
543 define_dollar_label (temp);
544 colon (dollar_label_name (temp, 0));
547 #endif /* LOCAL_LABELS_DOLLAR */
549 #ifdef LOCAL_LABELS_FB
550 if (*input_line_pointer++ == ':')
552 fb_label_instance_inc (temp);
553 colon (fb_label_name (temp, 0));
556 #endif /* LOCAL_LABELS_FB */
558 input_line_pointer = backup;
559 } /* local label ("4:") */
560 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
562 if (c && strchr (line_comment_chars, c))
563 { /* Its a comment. Better say APP or NO_APP */
569 extern char *scrub_string, *scrub_last_string;
571 bump_line_counters ();
572 s = input_line_pointer;
573 if (strncmp (s, "APP\n", 4))
574 continue; /* We ignore it */
577 ends = strstr (s, "#NO_APP\n");
584 /* The end of the #APP wasn't in this buffer. We
585 keep reading in buffers until we find the #NO_APP
586 that goes with this #APP There is one. The specs
588 tmp_len = buffer_limit - s;
589 tmp_buf = xmalloc (tmp_len + 1);
590 bcopy (s, tmp_buf, tmp_len);
593 new_tmp = input_scrub_next_buffer (&buffer);
597 buffer_limit = new_tmp;
598 input_line_pointer = buffer;
599 ends = strstr (buffer, "#NO_APP\n");
603 num = buffer_limit - buffer;
605 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
606 bcopy (buffer, tmp_buf + tmp_len, num);
611 input_line_pointer = ends ? ends + 8 : NULL;
619 input_line_pointer = ends + 8;
621 new_buf = xmalloc (100);
626 scrub_last_string = ends;
631 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
635 if (new_tmp == new_buf + new_length)
637 new_buf = xrealloc (new_buf, new_length + 100);
638 new_tmp = new_buf + new_length;
646 old_input = input_line_pointer;
647 old_limit = buffer_limit;
649 input_line_pointer = new_buf;
650 buffer_limit = new_tmp;
654 HANDLE_CONDITIONAL_ASSEMBLY ();
656 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
657 input_line_pointer--; /* Report unknown char as ignored. */
658 ignore_rest_of_line ();
659 } /* while (input_line_pointer<buffer_limit) */
662 bump_line_counters ();
666 input_line_pointer = old_input;
667 buffer_limit = old_limit;
672 } /* while (more buffers to scan) */
673 input_scrub_close (); /* Close the input file */
675 } /* read_a_source_file() */
680 as_fatal (".abort detected. Abandoning ship.");
683 /* For machines where ".align 4" means align to a 4 byte boundary. */
688 register unsigned int temp;
689 register long temp_fill;
691 unsigned long max_alignment = 1 << 15;
693 if (is_end_of_line[*input_line_pointer])
694 temp = arg; /* Default value from pseudo-op table */
696 temp = get_absolute_expression ();
698 if (temp > max_alignment)
700 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
704 * For the sparc, `.align (1<<n)' actually means `.align n'
705 * so we have to convert it.
709 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
713 as_bad ("Alignment not a power of 2");
716 if (*input_line_pointer == ',')
718 input_line_pointer++;
719 temp_fill = get_absolute_expression ();
721 else if (now_seg != data_section && now_seg != bss_section)
722 temp_fill = NOP_OPCODE;
725 /* Only make a frag if we HAVE to. . . */
726 if (temp && !need_pass_2)
727 frag_align (temp, (int) temp_fill);
729 record_alignment (now_seg, temp);
731 demand_empty_rest_of_line ();
732 } /* s_align_bytes() */
734 /* For machines where ".align 4" means align to 2**4 boundary. */
739 register long temp_fill;
740 long max_alignment = 15;
742 temp = get_absolute_expression ();
743 if (temp > max_alignment)
744 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
747 as_bad ("Alignment negative. 0 assumed.");
750 if (*input_line_pointer == ',')
752 input_line_pointer++;
753 temp_fill = get_absolute_expression ();
755 /* @@ Fix this right for BFD! */
756 else if (now_seg != data_section && now_seg != bss_section)
757 temp_fill = NOP_OPCODE;
760 /* Only make a frag if we HAVE to. . . */
761 if (temp && !need_pass_2)
762 frag_align (temp, (int) temp_fill);
764 record_alignment (now_seg, temp);
766 demand_empty_rest_of_line ();
767 } /* s_align_ptwo() */
776 register symbolS *symbolP;
778 name = input_line_pointer;
779 c = get_symbol_end ();
780 /* just after name is now '\0' */
781 p = input_line_pointer;
784 if (*input_line_pointer != ',')
786 as_bad ("Expected comma after symbol-name: rest of line ignored.");
787 ignore_rest_of_line ();
790 input_line_pointer++; /* skip ',' */
791 if ((temp = get_absolute_expression ()) < 0)
793 as_warn (".COMMon length (%d.) <0! Ignored.", temp);
794 ignore_rest_of_line ();
798 symbolP = symbol_find_or_make (name);
800 if (S_IS_DEFINED (symbolP))
802 as_bad ("Ignoring attempt to re-define symbol");
803 ignore_rest_of_line ();
806 if (S_GET_VALUE (symbolP))
808 if (S_GET_VALUE (symbolP) != temp)
809 as_bad ("Length of .comm \"%s\" is already %d. Not changed to %d.",
810 S_GET_NAME (symbolP),
811 S_GET_VALUE (symbolP),
816 S_SET_VALUE (symbolP, temp);
817 S_SET_EXTERNAL (symbolP);
820 if ( (!temp) || !flagseen['1'])
821 S_GET_OTHER(symbolP) = const_flag;
822 #endif /* not OBJ_VMS */
823 know (symbolP->sy_frag == &zero_address_frag);
824 demand_empty_rest_of_line ();
832 temp = get_absolute_expression ();
834 subseg_set (data_section, (subsegT) temp);
836 subseg_new (data_section, (subsegT) temp);
842 demand_empty_rest_of_line ();
845 /* Handle the .appfile pseudo-op. This is automatically generated by
846 do_scrub_next_char when a preprocessor # line comment is seen with
847 a file name. This default definition may be overridden by the
848 object or CPU specific pseudo-ops. This function is also the
849 default definition for .file; the APPFILE argument is 1 for
850 .appfile, 0 for .file. */
859 /* Some assemblers tolerate immediately following '"' */
860 if ((s = demand_copy_string (&length)) != 0)
862 /* If this is a fake .appfile, a fake newline was inserted into
863 the buffer. Passing -2 to new_logical_line tells it to
865 new_logical_line (s, appfile ? -2 : -1);
866 demand_empty_rest_of_line ();
869 listing_source_file (s);
873 c_dot_file_symbol (s);
874 #endif /* OBJ_COFF */
880 /* Handle the .appline pseudo-op. This is automatically generated by
881 do_scrub_next_char when a preprocessor # line comment is seen.
882 This default definition may be overridden by the object or CPU
883 specific pseudo-ops. */
890 /* The given number is that of the next line. */
891 l = get_absolute_expression () - 1;
892 new_logical_line ((char *) NULL, l);
895 listing_source_line (l);
897 demand_empty_rest_of_line ();
903 long temp_repeat = 0;
905 register long temp_fill = 0;
909 temp_repeat = get_absolute_expression ();
910 if (*input_line_pointer == ',')
912 input_line_pointer++;
913 temp_size = get_absolute_expression ();
914 if (*input_line_pointer == ',')
916 input_line_pointer++;
917 temp_fill = get_absolute_expression ();
920 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
921 #define BSD_FILL_SIZE_CROCK_8 (8)
922 if (temp_size > BSD_FILL_SIZE_CROCK_8)
924 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
925 temp_size = BSD_FILL_SIZE_CROCK_8;
929 as_warn ("Size negative: .fill ignored.");
932 else if (temp_repeat <= 0)
934 as_warn ("Repeat < 0, .fill ignored");
938 if (temp_size && !need_pass_2)
940 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
941 memset (p, 0, (int) temp_size);
942 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
943 * flavoured AS. The following bizzare behaviour is to be
944 * compatible with above. I guess they tried to take up to 8
945 * bytes from a 4-byte expression and they forgot to sign
946 * extend. Un*x Sux. */
947 #define BSD_FILL_SIZE_CROCK_4 (4)
948 md_number_to_chars (p, temp_fill,
949 (temp_size > BSD_FILL_SIZE_CROCK_4
950 ? BSD_FILL_SIZE_CROCK_4
952 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
953 * but emits no error message because it seems a legal thing to do.
954 * It is a degenerate case of .fill but could be emitted by a compiler.
957 demand_empty_rest_of_line ();
969 name = input_line_pointer;
970 c = get_symbol_end ();
971 symbolP = symbol_find_or_make (name);
972 *input_line_pointer = c;
974 S_SET_EXTERNAL (symbolP);
977 input_line_pointer++;
979 if (*input_line_pointer == '\n')
984 demand_empty_rest_of_line ();
988 s_lcomm (needs_align)
989 /* 1 if this was a ".bss" directive, which may require a 3rd argument
990 (alignment); 0 if it was an ".lcomm" (2 args only) */
997 register symbolS *symbolP;
998 segT current_seg = now_seg;
999 subsegT current_subseg = now_subseg;
1000 const int max_alignment = 15;
1002 segT bss_seg = bss_section;
1004 name = input_line_pointer;
1005 c = get_symbol_end ();
1006 p = input_line_pointer;
1009 if (*input_line_pointer != ',')
1011 as_bad ("Expected comma after name");
1012 ignore_rest_of_line ();
1016 ++input_line_pointer;
1018 if (*input_line_pointer == '\n')
1020 as_bad ("Missing size expression");
1024 if ((temp = get_absolute_expression ()) < 0)
1026 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1027 ignore_rest_of_line ();
1033 /* For MIPS ECOFF, small objects are put in .sbss. */
1034 if (temp <= bfd_get_gp_size (stdoutput))
1035 bss_seg = subseg_new (".sbss", 1);
1043 if (*input_line_pointer != ',')
1045 as_bad ("Expected comma after size");
1046 ignore_rest_of_line ();
1049 input_line_pointer++;
1051 if (*input_line_pointer == '\n')
1053 as_bad ("Missing alignment");
1056 align = get_absolute_expression ();
1057 if (align > max_alignment)
1059 align = max_alignment;
1060 as_warn ("Alignment too large: %d. assumed.", align);
1065 as_warn ("Alignment negative. 0 assumed.");
1067 record_alignment (bss_seg, align);
1068 } /* if needs align */
1071 symbolP = symbol_find_or_make (name);
1075 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1076 S_GET_OTHER (symbolP) == 0 &&
1077 S_GET_DESC (symbolP) == 0 &&
1078 #endif /* OBJ_AOUT or OBJ_BOUT */
1079 (S_GET_SEGMENT (symbolP) == bss_seg
1080 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1084 #ifdef BFD_ASSEMBLER
1085 subseg_set (bss_seg, 1);
1087 subseg_new (bss_seg, 1);
1091 frag_align (align, 0);
1092 /* detach from old frag */
1093 if (S_GET_SEGMENT (symbolP) == bss_seg)
1094 symbolP->sy_frag->fr_symbol = NULL;
1096 symbolP->sy_frag = frag_now;
1097 p = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1101 S_SET_SEGMENT (symbolP, bss_seg);
1104 /* The symbol may already have been created with a preceding
1105 ".globl" directive -- be careful not to step on storage class
1106 in that case. Otherwise, set it to static. */
1107 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1109 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1111 #endif /* OBJ_COFF */
1115 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1118 #ifdef BFD_ASSEMBLER
1119 subseg_set (current_seg, current_subseg);
1121 subseg_new (current_seg, current_subseg);
1124 demand_empty_rest_of_line ();
1142 register char *name;
1145 register segT segment;
1147 register symbolS *symbolP;
1149 /* we permit ANY defined expression: BSD4.2 demands constants */
1150 name = input_line_pointer;
1151 c = get_symbol_end ();
1152 p = input_line_pointer;
1155 if (*input_line_pointer != ',')
1158 as_bad ("Expected comma after name \"%s\"", name);
1160 ignore_rest_of_line ();
1163 input_line_pointer++;
1164 segment = expression (&exp);
1165 if (segment != absolute_section
1166 && segment != reg_section
1167 && ! SEG_NORMAL (segment))
1169 as_bad ("Bad expression: %s", segment_name (segment));
1170 ignore_rest_of_line ();
1174 symbolP = symbol_find_or_make (name);
1176 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1177 symbolP->sy_desc == 0) out of this test because coff doesn't have
1178 those fields, and I can't see when they'd ever be tripped. I
1179 don't think I understand why they were here so I may have
1180 introduced a bug. As recently as 1.37 didn't have this test
1181 anyway. xoxorich. */
1183 if (S_GET_SEGMENT (symbolP) == undefined_section
1184 && S_GET_VALUE (symbolP) == 0)
1186 /* The name might be an undefined .global symbol; be sure to
1187 keep the "external" bit. */
1188 S_SET_SEGMENT (symbolP, segment);
1189 S_SET_VALUE (symbolP, (valueT) (exp.X_add_number));
1193 as_bad ("Symbol %s already defined", name);
1196 demand_empty_rest_of_line ();
1202 register segT segment;
1204 register long temp_fill;
1206 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1207 thing as a sub-segment-relative origin. Any absolute origin is
1208 given a warning, then assumed to be segment-relative. Any
1209 segmented origin expression ("foo+42") had better be in the right
1210 segment or the .org is ignored.
1212 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1213 we never know sub-segment sizes when we are reading code. BSD
1214 will crash trying to emit negative numbers of filler bytes in
1215 certain .orgs. We don't crash, but see as-write for that code.
1217 Don't make frag if need_pass_2==1. */
1218 segment = get_known_segmented_expression (&exp);
1219 if (*input_line_pointer == ',')
1221 input_line_pointer++;
1222 temp_fill = get_absolute_expression ();
1228 if (segment != now_seg && segment != absolute_section)
1229 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1230 segment_name (segment), segment_name (now_seg));
1231 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1232 exp.X_add_number, (char *) 0);
1234 } /* if (ok to make frag) */
1235 demand_empty_rest_of_line ();
1241 register char *name;
1242 register char delim;
1243 register char *end_name;
1244 register symbolS *symbolP;
1247 * Especial apologies for the random logic:
1248 * this just grew, and could be parsed much more simply!
1251 name = input_line_pointer;
1252 delim = get_symbol_end ();
1253 end_name = input_line_pointer;
1257 if (*input_line_pointer != ',')
1260 as_bad ("Expected comma after name \"%s\"", name);
1262 ignore_rest_of_line ();
1266 input_line_pointer++;
1269 if (name[0] == '.' && name[1] == '\0')
1271 /* Turn '. = mumble' into a .org mumble */
1272 register segT segment;
1276 segment = get_known_segmented_expression (&exp);
1280 if (segment != now_seg && segment != absolute_section)
1281 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1282 segment_name (segment),
1283 segment_name (now_seg));
1284 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1285 exp.X_add_number, (char *) 0);
1287 } /* if (ok to make frag) */
1293 if ((symbolP = symbol_find (name)) == NULL
1294 && (symbolP = md_undefined_symbol (name)) == NULL)
1296 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1298 /* "set" symbols are local unless otherwise specified. */
1299 SF_SET_LOCAL (symbolP);
1300 #endif /* OBJ_COFF */
1302 } /* make a new symbol */
1304 symbol_table_insert (symbolP);
1307 pseudo_set (symbolP);
1308 demand_empty_rest_of_line ();
1316 register long temp_fill;
1319 /* Just like .fill, but temp_size = 1 */
1320 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1322 temp_fill = get_absolute_expression ();
1326 input_line_pointer--; /* Backup over what was not a ','. */
1331 temp_repeat *= mult;
1333 if (temp_repeat <= 0)
1335 as_warn ("Repeat < 0, .space ignored");
1336 ignore_rest_of_line ();
1341 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1342 temp_repeat, (char *) 0);
1345 demand_empty_rest_of_line ();
1353 temp = get_absolute_expression ();
1354 #ifdef BFD_ASSEMBLER
1355 subseg_set (text_section, (subsegT) temp);
1357 subseg_new (text_section, (subsegT) temp);
1359 demand_empty_rest_of_line ();
1364 demand_empty_rest_of_line ()
1367 if (is_end_of_line[*input_line_pointer])
1369 input_line_pointer++;
1373 ignore_rest_of_line ();
1375 /* Return having already swallowed end-of-line. */
1376 } /* Return pointing just after end-of-line. */
1379 ignore_rest_of_line () /* For suspect lines: gives warning. */
1381 if (!is_end_of_line[*input_line_pointer])
1383 if (isprint (*input_line_pointer))
1384 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1385 *input_line_pointer);
1387 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1388 *input_line_pointer);
1389 while (input_line_pointer < buffer_limit
1390 && !is_end_of_line[*input_line_pointer])
1392 input_line_pointer++;
1395 input_line_pointer++; /* Return pointing just after end-of-line. */
1396 know (is_end_of_line[input_line_pointer[-1]]);
1402 * In: Pointer to a symbol.
1403 * Input_line_pointer->expression.
1405 * Out: Input_line_pointer->just after any whitespace after expression.
1406 * Tried to set symbol to value of expression.
1407 * Will change symbols type, value, and frag;
1408 * May set need_pass_2 == 1.
1411 pseudo_set (symbolP)
1415 register segT segment;
1416 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1418 #endif /* OBJ_AOUT or OBJ_BOUT */
1420 know (symbolP); /* NULL pointer is logic error. */
1421 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1422 /* @@ Fix this right for BFD. */
1423 ext = S_IS_EXTERNAL (symbolP);
1424 #endif /* OBJ_AOUT or OBJ_BOUT */
1426 if ((segment = expression (&exp)) == absent_section)
1428 as_bad ("Missing expression: absolute 0 assumed");
1429 exp.X_seg = absolute_section;
1430 exp.X_add_number = 0;
1433 if (segment == reg_section)
1435 S_SET_SEGMENT (symbolP, reg_section);
1436 S_SET_VALUE (symbolP, exp.X_add_number);
1437 symbolP->sy_frag = &zero_address_frag;
1439 else if (segment == big_section)
1441 as_bad ("%s number invalid. Absolute 0 assumed.",
1442 exp.X_add_number > 0 ? "Bignum" : "Floating-Point");
1443 S_SET_SEGMENT (symbolP, absolute_section);
1444 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1445 /* @@ Fix this right for BFD. */
1446 ext ? S_SET_EXTERNAL (symbolP) :
1447 S_CLEAR_EXTERNAL (symbolP);
1448 #endif /* OBJ_AOUT or OBJ_BOUT */
1449 S_SET_VALUE (symbolP, 0);
1450 symbolP->sy_frag = &zero_address_frag;
1452 else if (segment == absent_section)
1454 as_warn ("No expression: Using absolute 0");
1455 S_SET_SEGMENT (symbolP, absolute_section);
1456 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1457 /* @@ Fix this right for BFD. */
1458 ext ? S_SET_EXTERNAL (symbolP) :
1459 S_CLEAR_EXTERNAL (symbolP);
1460 #endif /* OBJ_AOUT or OBJ_BOUT */
1461 S_SET_VALUE (symbolP, 0);
1462 symbolP->sy_frag = &zero_address_frag;
1464 else if (segment == diff_section)
1466 if (exp.X_add_symbol && exp.X_subtract_symbol
1467 && (S_GET_SEGMENT (exp.X_add_symbol) ==
1468 S_GET_SEGMENT (exp.X_subtract_symbol)))
1470 if (exp.X_add_symbol->sy_frag == exp.X_subtract_symbol->sy_frag)
1472 exp.X_add_number += S_GET_VALUE (exp.X_add_symbol) -
1473 S_GET_VALUE (exp.X_subtract_symbol);
1476 as_bad ("Invalid expression: separation between symbols `%s'",
1477 S_GET_NAME (exp.X_add_symbol));
1478 as_bad (" and `%s' may not be constant",
1479 S_GET_NAME (exp.X_subtract_symbol));
1484 as_bad ("Complex expression. Absolute segment assumed.");
1488 else if (segment == absolute_section)
1491 S_SET_SEGMENT (symbolP, absolute_section);
1492 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1493 /* @@ Fix this right for BFD. */
1494 ext ? S_SET_EXTERNAL (symbolP) :
1495 S_CLEAR_EXTERNAL (symbolP);
1496 #endif /* OBJ_AOUT or OBJ_BOUT */
1497 S_SET_VALUE (symbolP, exp.X_add_number);
1498 symbolP->sy_frag = &zero_address_frag;
1500 else if (segment == pass1_section)
1502 symbolP->sy_forward = exp.X_add_symbol;
1503 as_bad ("Unknown expression");
1504 know (need_pass_2 == 1);
1506 else if (segment == undefined_section)
1508 symbolP->sy_forward = exp.X_add_symbol;
1512 #ifndef BFD_ASSEMBLER
1513 #ifndef MANY_SEGMENTS
1522 as_fatal ("failed sanity check.");
1523 } /* switch on segment */
1526 S_SET_SEGMENT (symbolP, segment);
1527 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1528 /* @@ Fix this right for BFD! */
1531 S_SET_EXTERNAL (symbolP);
1535 S_CLEAR_EXTERNAL (symbolP);
1537 #endif /* OBJ_AOUT or OBJ_BOUT */
1539 S_SET_VALUE (symbolP, exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1540 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1547 * CONStruct more frag of .bytes, or .words etc.
1548 * Should need_pass_2 be 1 then emit no frag(s).
1549 * This understands EXPRESSIONS, as opposed to big_cons().
1553 * This has a split personality. We use expression() to read the
1554 * value. We can detect if the value won't fit in a byte or word.
1555 * But we can't detect if expression() discarded significant digits
1556 * in the case of a long. Not worth the crocks required to fix it.
1559 /* Select a parser for cons expressions. */
1561 /* Some targets need to parse the expression in various fancy ways.
1562 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1563 (for example, the HPPA does this). Otherwise, you can define
1564 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1565 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1566 are defined, which is the normal case, then only simple expressions
1569 #ifndef TC_PARSE_CONS_EXPRESSION
1570 #ifdef BITFIELD_CONS_EXPRESSIONS
1571 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1573 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1576 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1578 parse_mri_cons PARAMS ((expressionS *exp));
1580 #ifdef REPEAT_CONS_EXPRESSIONS
1581 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1583 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1586 /* If we haven't gotten one yet, just call expression. */
1587 #ifndef TC_PARSE_CONS_EXPRESSION
1588 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1592 /* worker to do .byte etc statements */
1593 /* clobbers input_line_pointer, checks */
1597 register unsigned int nbytes; /* 1=.byte, 2=.word, 4=.long */
1601 if (is_it_end_of_statement ())
1603 demand_empty_rest_of_line ();
1609 TC_PARSE_CONS_EXPRESSION (&exp, nbytes);
1610 emit_expr (&exp, nbytes);
1612 while (*input_line_pointer++ == ',');
1614 input_line_pointer--; /* Put terminator back into stream. */
1615 demand_empty_rest_of_line ();
1618 /* Put the contents of expression EXP into the object file using
1619 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1622 emit_expr (exp, nbytes)
1624 unsigned int nbytes;
1629 /* Don't do anything if we are going to make another pass. */
1633 segment = exp->X_seg;
1635 /* Don't call this if we are going to junk this pass anyway! */
1636 know (segment != pass1_section);
1638 if (segment == diff_section && exp->X_add_symbol == NULL)
1640 as_bad ("Subtracting symbol \"%s\" (segment \"%s\") is too hard. Absolute segment assumed.",
1641 S_GET_NAME (exp->X_subtract_symbol),
1642 segment_name (S_GET_SEGMENT (exp->X_subtract_symbol)));
1643 segment = absolute_section;
1644 /* Leave exp->X_add_number alone. */
1646 else if (segment == absent_section)
1648 as_warn ("0 assumed for missing expression");
1649 exp->X_add_number = 0;
1650 know (exp->X_add_symbol == NULL);
1651 segment = absolute_section;
1653 else if (segment == big_section)
1655 as_bad ("%s number invalid. Absolute 0 assumed.",
1656 exp->X_add_number > 0 ? "Bignum" : "Floating-Point");
1657 exp->X_add_number = 0;
1658 segment = absolute_section;
1661 p = frag_more (nbytes);
1663 #ifndef WORKING_DOT_WORD
1664 /* If we have the difference of two symbols in a word, save it on
1665 the broken_words list. See the code in write.c. */
1666 if (segment == diff_section && nbytes == 2)
1668 struct broken_word *x;
1670 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1671 x->next_broken_word = broken_words;
1674 x->word_goes_here = p;
1676 x->add = exp->X_add_symbol;
1677 x->sub = exp->X_subtract_symbol;
1678 x->addnum = exp->X_add_number;
1685 if (segment == absolute_section)
1690 register long unmask;
1692 /* JF << of >= number of bits in the object is undefined. In
1693 particular SPARC (Sun 4) has problems */
1694 if (nbytes >= sizeof (long))
1697 mask = ~0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1699 unmask = ~mask; /* Do store these bits. */
1702 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1703 mask = ~(unmask >> 1); /* Includes sign bit now. */
1706 get = exp->X_add_number;
1708 if ((get & mask) != 0 && (get & mask) != mask)
1709 { /* Leading bits contain both 0s & 1s. */
1710 as_warn ("Value 0x%x truncated to 0x%x.", get, use);
1712 md_number_to_chars (p, use, nbytes); /* put bytes in right order. */
1716 md_number_to_chars (p, (long) 0, nbytes);
1718 /* Now we need to generate a fixS to record the symbol value.
1719 This is easy for BFD. For other targets it can be more
1720 complex. For very complex cases (currently, the HPPA and
1721 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1722 want. For simpler cases, you can define TC_CONS_RELOC to be
1723 the name of the reloc code that should be stored in the fixS.
1724 If neither is defined, the code uses NO_RELOC if it is
1725 defined, and otherwise uses 0. */
1727 #ifdef BFD_ASSEMBLER
1728 fix_new (frag_now, p - frag_now->fr_literal, nbytes,
1729 exp->X_add_symbol, exp->X_subtract_symbol,
1730 exp->X_add_number, 0,
1731 /* @@ Should look at CPU word size. */
1734 #ifdef TC_CONS_FIX_NEW
1735 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1737 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1738 it is defined, otherwise use NO_RELOC if it is defined,
1740 #ifndef TC_CONS_RELOC
1742 #define TC_CONS_RELOC NO_RELOC
1744 #define TC_CONS_RELOC 0
1747 fix_new (frag_now, p - frag_now->fr_literal, nbytes,
1748 exp->X_add_symbol, exp->X_subtract_symbol,
1749 exp->X_add_number, 0, TC_CONS_RELOC);
1750 #endif /* TC_CONS_FIX_NEW */
1751 #endif /* BFD_ASSEMBLER */
1755 #ifdef BITFIELD_CONS_EXPRESSIONS
1757 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1758 w:x,y:z, where w and y are bitwidths and x and y are values. They
1759 then pack them all together. We do a little better in that we allow
1760 them in words, longs, etc. and we'll pack them in target byte order
1763 The rules are: pack least significat bit first, if a field doesn't
1764 entirely fit, put it in the next unit. Overflowing the bitfield is
1765 explicitly *not* even a warning. The bitwidth should be considered
1768 To use this function the tc-XXX.h file should define
1769 BITFIELD_CONS_EXPRESSIONS. */
1772 parse_bitfield_cons (exp, nbytes)
1774 unsigned int nbytes;
1776 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1777 char *hold = input_line_pointer;
1780 segment = expression (exp);
1782 if (*input_line_pointer == ':')
1788 unsigned long width;
1790 if (*input_line_pointer != ':')
1792 input_line_pointer = hold;
1794 } /* next piece is not a bitfield */
1796 /* In the general case, we can't allow
1797 full expressions with symbol
1798 differences and such. The relocation
1799 entries for symbols not defined in this
1800 assembly would require arbitrary field
1801 widths, positions, and masks which most
1802 of our current object formats don't
1805 In the specific case where a symbol
1806 *is* defined in this assembly, we
1807 *could* build fixups and track it, but
1808 this could lead to confusion for the
1809 backends. I'm lazy. I'll take any
1810 SEG_ABSOLUTE. I think that means that
1811 you can use a previous .set or
1812 .equ type symbol. xoxorich. */
1814 if (segment == absent_section)
1816 as_warn ("Using a bit field width of zero.");
1817 exp->X_add_number = 0;
1818 segment = absolute_section;
1819 } /* implied zero width bitfield */
1821 if (segment != absolute_section)
1823 *input_line_pointer = '\0';
1824 as_bad ("Field width \"%s\" too complex for a bitfield.\n", hold);
1825 *input_line_pointer = ':';
1826 demand_empty_rest_of_line ();
1830 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1832 as_warn ("Field width %d too big to fit in %d bytes: truncated to %d bits.",
1833 width, nbytes, (BITS_PER_CHAR * nbytes));
1834 width = BITS_PER_CHAR * nbytes;
1837 if (width > bits_available)
1839 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1840 input_line_pointer = hold;
1841 exp->X_add_number = value;
1845 hold = ++input_line_pointer; /* skip ':' */
1847 if ((segment = expression (exp)) != absolute_section)
1849 char cache = *input_line_pointer;
1851 *input_line_pointer = '\0';
1852 as_bad ("Field value \"%s\" too complex for a bitfield.\n", hold);
1853 *input_line_pointer = cache;
1854 demand_empty_rest_of_line ();
1858 value |= (~(-1 << width) & exp->X_add_number)
1859 << ((BITS_PER_CHAR * nbytes) - bits_available);
1861 if ((bits_available -= width) == 0
1862 || is_it_end_of_statement ()
1863 || *input_line_pointer != ',')
1866 } /* all the bitfields we're gonna get */
1868 hold = ++input_line_pointer;
1869 segment = expression (exp);
1870 } /* forever loop */
1872 exp->X_add_number = value;
1873 exp->X_seg = absolute_section;
1874 } /* if looks like a bitfield */
1875 } /* parse_bitfield_cons() */
1877 #endif /* BITFIELD_CONS_EXPRESSIONS */
1882 parse_mri_cons (exp, nbytes)
1884 unsigned int nbytes;
1886 if (*input_line_pointer == '\'')
1888 /* An MRI style string, cut into as many bytes as will fit into
1889 a nbyte chunk, left justify if necessary, and separate with
1890 commas so we can try again later */
1892 unsigned int result = 0;
1893 input_line_pointer++;
1894 for (scan = 0; scan < nbytes; scan++)
1896 if (*input_line_pointer == '\'')
1898 if (input_line_pointer[1] == '\'')
1900 input_line_pointer++;
1905 result = (result << 8) | (*input_line_pointer++);
1909 while (scan < nbytes)
1914 /* Create correct expression */
1915 exp->X_add_symbol = 0;
1916 exp->X_add_number = result;
1917 exp->X_seg = absolute_section;
1918 /* Fake it so that we can read the next char too */
1919 if (input_line_pointer[0] != '\'' ||
1920 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
1922 input_line_pointer -= 2;
1923 input_line_pointer[0] = ',';
1924 input_line_pointer[1] = '\'';
1927 input_line_pointer++;
1935 #ifdef REPEAT_CONS_EXPRESSIONS
1937 /* Parse a repeat expression for cons. This is used by the MIPS
1938 assembler. The format is NUMBER:COUNT; NUMBER appears in the
1939 object file COUNT times.
1941 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
1944 parse_repeat_cons (exp, nbytes)
1946 unsigned int nbytes;
1954 if (*input_line_pointer != ':')
1956 /* No repeat count. */
1960 ++input_line_pointer;
1961 segment = expression (&count);
1962 if (segment != absolute_section
1963 || count.X_add_number <= 0)
1965 as_warn ("Unresolvable or nonpositive repeat count; using 1");
1969 /* The cons function is going to output this expression once. So we
1970 output it count - 1 times. */
1971 for (i = count.X_add_number - 1; i > 0; i--)
1972 emit_expr (exp, nbytes);
1975 #endif /* REPEAT_CONS_EXPRESSIONS */
1980 * CONStruct more frag(s) of .quads, or .octa etc.
1981 * Makes 0 or more new frags.
1982 * If need_pass_2 == 1, generate no frag.
1983 * This understands only bignums, not expressions. Cons() understands
1986 * Constants recognised are '0...'(octal) '0x...'(hex) '...'(decimal).
1988 * This creates objects with struct obstack_control objs, destroying
1989 * any context objs held about a partially completed object. Beware!
1992 * I think it sucks to have 2 different types of integers, with 2
1993 * routines to read them, store them etc.
1994 * It would be nicer to permit bignums in expressions and only
1995 * complain if the result overflowed. However, due to "efficiency"...
1997 /* worker to do .quad etc statements */
1998 /* clobbers input_line_pointer, checks */
2000 /* 8=.quad 16=.octa ... */
2004 register int nbytes;
2006 register char c; /* input_line_pointer->c. */
2008 register long length; /* Number of chars in an object. */
2009 register int digit; /* Value of 1 digit. */
2010 register int carry; /* For multi-precision arithmetic. */
2011 register int work; /* For multi-precision arithmetic. */
2012 register char *p; /* For multi-precision arithmetic. */
2014 extern const char hex_value[]; /* In hex_value.c. */
2017 * The following awkward logic is to parse ZERO or more strings,
2018 * comma seperated. Recall an expression includes its leading &
2019 * trailing blanks. We fake a leading ',' if there is (supposed to
2020 * be) a 1st expression, and keep demanding 1 expression for each ','.
2022 if (is_it_end_of_statement ())
2024 c = 0; /* Skip loop. */
2028 c = ','; /* Do loop. */
2029 --input_line_pointer;
2033 ++input_line_pointer;
2035 c = *input_line_pointer;
2036 /* C contains 1st non-blank character of what we hope is a number. */
2039 c = *++input_line_pointer;
2040 if (c == 'x' || c == 'X')
2042 c = *++input_line_pointer;
2055 * This feature (?) is here to stop people worrying about
2056 * mysterious zero constants: which is what they get when
2057 * they completely omit digits.
2059 if (hex_value[c] >= radix)
2061 as_bad ("Missing digits. 0 assumed.");
2063 bignum_high = bignum_low - 1; /* Start constant with 0 chars. */
2064 for (; (digit = hex_value[c]) < radix; c = *++input_line_pointer)
2066 /* Multiply existing number by radix, then add digit. */
2068 for (p = bignum_low; p <= bignum_high; p++)
2070 work = (*p & MASK_CHAR) * radix + carry;
2071 *p = work & MASK_CHAR;
2072 carry = work >> BITS_PER_CHAR;
2077 *bignum_high = carry & MASK_CHAR;
2078 know ((carry & ~MASK_CHAR) == 0);
2081 length = bignum_high - bignum_low + 1;
2082 if (length > nbytes)
2084 as_warn ("Most significant bits truncated in integer constant.");
2088 register long leading_zeroes;
2090 for (leading_zeroes = nbytes - length;
2100 char *src = bignum_low;
2101 p = frag_more (nbytes);
2102 if (target_big_endian)
2105 for (i = nbytes - 1; i >= 0; i--)
2109 bcopy (bignum_low, p, (int) nbytes);
2111 /* C contains character after number. */
2113 c = *input_line_pointer;
2114 /* C contains 1st non-blank character after number. */
2116 demand_empty_rest_of_line ();
2119 /* Extend bignum by 1 char. */
2123 register long length;
2126 if (bignum_high >= bignum_limit)
2128 length = bignum_limit - bignum_low;
2129 bignum_low = xrealloc (bignum_low, length + length);
2130 bignum_high = bignum_low + length;
2131 bignum_limit = bignum_low + length + length;
2133 } /* grow_bignum(); */
2138 * CONStruct some more frag chars of .floats .ffloats etc.
2139 * Makes 0 or more new frags.
2140 * If need_pass_2 == 1, no frags are emitted.
2141 * This understands only floating literals, not expressions. Sorry.
2143 * A floating constant is defined by atof_generic(), except it is preceded
2144 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2145 * reading, I decided to be incompatible. This always tries to give you
2146 * rounded bits to the precision of the pseudo-op. Former AS did premature
2147 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2148 * a choice of 2 flavours of noise according to which of 2 floating-point
2149 * scanners you directed AS to use.
2151 * In: input_line_pointer->whitespace before, or '0' of flonum.
2155 void /* JF was static, but can't be if VAX.C is goning to use it */
2156 float_cons (float_type) /* Worker to do .float etc statements. */
2157 /* Clobbers input_line-pointer, checks end-of-line. */
2158 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2162 int length; /* Number of chars in an object. */
2163 register char *err; /* Error from scanning floating literal. */
2164 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2167 * The following awkward logic is to parse ZERO or more strings,
2168 * comma seperated. Recall an expression includes its leading &
2169 * trailing blanks. We fake a leading ',' if there is (supposed to
2170 * be) a 1st expression, and keep demanding 1 expression for each ','.
2172 if (is_it_end_of_statement ())
2174 c = 0; /* Skip loop. */
2175 ++input_line_pointer; /*->past termintor. */
2179 c = ','; /* Do loop. */
2183 /* input_line_pointer->1st char of a flonum (we hope!). */
2185 /* Skip any 0{letter} that may be present. Don't even check if the
2186 * letter is legal. Someone may invent a "z" format and this routine
2187 * has no use for such information. Lusers beware: you get
2188 * diagnostics if your input is ill-conditioned.
2191 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2192 input_line_pointer += 2;
2194 err = md_atof (float_type, temp, &length);
2195 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2199 as_bad ("Bad floating literal: %s", err);
2200 ignore_rest_of_line ();
2201 /* Input_line_pointer->just after end-of-line. */
2202 c = 0; /* Break out of loop. */
2208 p = frag_more (length);
2209 bcopy (temp, p, length);
2212 c = *input_line_pointer++;
2213 /* C contains 1st non-white character after number. */
2214 /* input_line_pointer->just after terminator (c). */
2217 --input_line_pointer; /*->terminator (is not ','). */
2218 demand_empty_rest_of_line ();
2219 } /* float_cons() */
2224 * We read 0 or more ',' seperated, double-quoted strings.
2226 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2231 stringer (append_zero) /* Worker to do .ascii etc statements. */
2232 /* Checks end-of-line. */
2233 register int append_zero; /* 0: don't append '\0', else 1 */
2235 register unsigned int c;
2238 * The following awkward logic is to parse ZERO or more strings,
2239 * comma seperated. Recall a string expression includes spaces
2240 * before the opening '\"' and spaces after the closing '\"'.
2241 * We fake a leading ',' if there is (supposed to be)
2242 * a 1st, expression. We keep demanding expressions for each
2245 if (is_it_end_of_statement ())
2247 c = 0; /* Skip loop. */
2248 ++input_line_pointer; /* Compensate for end of loop. */
2252 c = ','; /* Do loop. */
2254 while (c == ',' || c == '<' || c == '"')
2257 switch (*input_line_pointer)
2260 ++input_line_pointer; /*->1st char of string. */
2261 while (is_a_char (c = next_char_of_string ()))
2263 FRAG_APPEND_1_CHAR (c);
2267 FRAG_APPEND_1_CHAR (0);
2269 know (input_line_pointer[-1] == '\"');
2272 input_line_pointer++;
2273 c = get_single_number ();
2274 FRAG_APPEND_1_CHAR (c);
2275 if (*input_line_pointer != '>')
2277 as_bad ("Expected <nn>");
2279 input_line_pointer++;
2282 input_line_pointer++;
2286 c = *input_line_pointer;
2289 demand_empty_rest_of_line ();
2292 /* FIXME-SOMEDAY: I had trouble here on characters with the
2293 high bits set. We'll probably also have trouble with
2294 multibyte chars, wide chars, etc. Also be careful about
2295 returning values bigger than 1 byte. xoxorich. */
2298 next_char_of_string ()
2300 register unsigned int c;
2302 c = *input_line_pointer++ & CHAR_MASK;
2310 switch (c = *input_line_pointer++)
2340 break; /* As itself. */
2355 for (number = 0; isdigit (c); c = *input_line_pointer++)
2357 number = number * 8 + c - '0';
2361 --input_line_pointer;
2365 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2366 as_warn ("Unterminated string: Newline inserted.");
2372 #ifdef ONLY_STANDARD_ESCAPES
2373 as_bad ("Bad escaped character in string, '?' assumed");
2375 #endif /* ONLY_STANDARD_ESCAPES */
2378 } /* switch on escaped char */
2383 } /* switch on char */
2385 } /* next_char_of_string() */
2388 get_segmented_expression (expP)
2389 register expressionS *expP;
2391 register segT retval;
2393 retval = expression (expP);
2394 if (retval == pass1_section
2395 || retval == absent_section
2396 || retval == big_section)
2398 as_bad ("Expected address expression: absolute 0 assumed");
2399 retval = expP->X_seg = absolute_section;
2400 expP->X_add_number = 0;
2401 expP->X_add_symbol = expP->X_subtract_symbol = 0;
2403 return (retval); /* SEG_ ABSOLUTE,UNKNOWN,DATA,TEXT,BSS */
2407 get_known_segmented_expression (expP)
2408 register expressionS *expP;
2410 register segT retval;
2411 register CONST char *name1;
2412 register CONST char *name2;
2414 if ((retval = get_segmented_expression (expP)) == undefined_section)
2416 name1 = expP->X_add_symbol ? S_GET_NAME (expP->X_add_symbol) : "";
2417 name2 = expP->X_subtract_symbol ?
2418 S_GET_NAME (expP->X_subtract_symbol) :
2422 as_warn ("Symbols \"%s\" \"%s\" are undefined: absolute 0 assumed.",
2427 as_warn ("Symbol \"%s\" undefined: absolute 0 assumed.",
2428 name1 ? name1 : name2);
2430 retval = expP->X_seg = absolute_section;
2431 expP->X_add_number = 0;
2432 expP->X_add_symbol = expP->X_subtract_symbol = NULL;
2434 know (retval == absolute_section
2435 || retval == diff_section
2436 || SEG_NORMAL (retval));
2439 } /* get_known_segmented_expression() */
2443 /* static */ long /* JF was static, but can't be if the MD pseudos are to use it */
2444 get_absolute_expression ()
2449 if ((s = expression (&exp)) != absolute_section)
2451 if (s != absent_section)
2453 as_bad ("Bad Absolute Expression, absolute 0 assumed.");
2455 exp.X_add_number = 0;
2457 return (exp.X_add_number);
2460 char /* return terminator */
2461 get_absolute_expression_and_terminator (val_pointer)
2462 long *val_pointer; /* return value of expression */
2464 *val_pointer = get_absolute_expression ();
2465 return (*input_line_pointer++);
2469 * demand_copy_C_string()
2471 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2472 * Give a warning if that happens.
2475 demand_copy_C_string (len_pointer)
2480 if ((s = demand_copy_string (len_pointer)) != 0)
2484 for (len = *len_pointer;
2493 as_bad ("This string may not contain \'\\0\'");
2501 * demand_copy_string()
2503 * Demand string, but return a safe (=private) copy of the string.
2504 * Return NULL if we can't read a string here.
2507 demand_copy_string (lenP)
2510 register unsigned int c;
2516 if (*input_line_pointer == '\"')
2518 input_line_pointer++; /* Skip opening quote. */
2520 while (is_a_char (c = next_char_of_string ()))
2522 obstack_1grow (¬es, c);
2525 /* JF this next line is so demand_copy_C_string will return a null
2526 termanated string. */
2527 obstack_1grow (¬es, '\0');
2528 retval = obstack_finish (¬es);
2532 as_warn ("Missing string");
2534 ignore_rest_of_line ();
2538 } /* demand_copy_string() */
2541 * is_it_end_of_statement()
2543 * In: Input_line_pointer->next character.
2545 * Do: Skip input_line_pointer over all whitespace.
2547 * Out: 1 if input_line_pointer->end-of-line.
2550 is_it_end_of_statement ()
2553 return (is_end_of_line[*input_line_pointer]);
2554 } /* is_it_end_of_statement() */
2560 register symbolS *symbolP; /* symbol we are working with */
2562 input_line_pointer++;
2563 if (*input_line_pointer == '=')
2564 input_line_pointer++;
2566 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2567 input_line_pointer++;
2569 if (sym_name[0] == '.' && sym_name[1] == '\0')
2571 /* Turn '. = mumble' into a .org mumble */
2572 register segT segment;
2576 segment = get_known_segmented_expression (&exp);
2579 if (segment != now_seg && segment != absolute_section)
2580 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2581 segment_name (segment),
2582 segment_name (now_seg));
2583 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2584 exp.X_add_number, (char *) 0);
2586 } /* if (ok to make frag) */
2590 symbolP = symbol_find_or_make (sym_name);
2591 pseudo_set (symbolP);
2595 /* .include -- include a file at this point. */
2608 filename = demand_copy_string (&i);
2609 demand_empty_rest_of_line ();
2610 path = xmalloc (i + include_dir_maxlen + 5 /* slop */ );
2611 for (i = 0; i < include_dir_count; i++)
2613 strcpy (path, include_dirs[i]);
2615 strcat (path, filename);
2616 if (0 != (try = fopen (path, "r")))
2625 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2626 newbuf = input_scrub_include_file (path, input_line_pointer);
2627 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2631 add_include_dir (path)
2636 if (include_dir_count == 0)
2638 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2639 include_dirs[0] = "."; /* Current dir */
2640 include_dir_count = 2;
2644 include_dir_count++;
2645 include_dirs = (char **) realloc (include_dirs,
2646 include_dir_count * sizeof (*include_dirs));
2649 include_dirs[include_dir_count - 1] = path; /* New one */
2652 if (i > include_dir_maxlen)
2653 include_dir_maxlen = i;
2654 } /* add_include_dir() */
2660 while (!is_end_of_line[*input_line_pointer])
2662 ++input_line_pointer;
2664 ++input_line_pointer;