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, 0, 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, 0, 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[(unsigned char) 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 */
704 as_fatal (".abort detected. Abandoning ship.");
707 /* Guts of .align directive. */
714 md_do_align (n, fill, just_record_alignment);
718 /* @@ Fix this right for BFD! */
720 static char nop_opcode = NOP_OPCODE;
722 if (now_seg != data_section && now_seg != bss_section)
731 /* Only make a frag if we HAVE to. . . */
732 if (n && !need_pass_2)
733 frag_align (n, *fill);
735 just_record_alignment:
736 record_alignment (now_seg, n);
739 /* For machines where ".align 4" means align to a 4 byte boundary. */
744 register unsigned int temp;
747 unsigned long max_alignment = 1 << 15;
749 if (is_end_of_line[(unsigned char) *input_line_pointer])
750 temp = arg; /* Default value from pseudo-op table */
752 temp = get_absolute_expression ();
754 if (temp > max_alignment)
756 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
759 /* For the sparc, `.align (1<<n)' actually means `.align n' so we
760 have to convert it. */
763 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
767 as_bad ("Alignment not a power of 2");
770 if (*input_line_pointer == ',')
772 input_line_pointer++;
773 temp_fill = get_absolute_expression ();
774 do_align (temp, &temp_fill);
777 do_align (temp, (char *) 0);
779 demand_empty_rest_of_line ();
782 /* For machines where ".align 4" means align to 2**4 boundary. */
784 s_align_ptwo (ignore)
789 long max_alignment = 15;
791 temp = get_absolute_expression ();
792 if (temp > max_alignment)
793 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
796 as_bad ("Alignment negative. 0 assumed.");
799 if (*input_line_pointer == ',')
801 input_line_pointer++;
802 temp_fill = get_absolute_expression ();
803 do_align (temp, &temp_fill);
806 do_align (temp, (char *) 0);
808 demand_empty_rest_of_line ();
819 register symbolS *symbolP;
821 name = input_line_pointer;
822 c = get_symbol_end ();
823 /* just after name is now '\0' */
824 p = input_line_pointer;
827 if (*input_line_pointer != ',')
829 as_bad ("Expected comma after symbol-name: rest of line ignored.");
830 ignore_rest_of_line ();
833 input_line_pointer++; /* skip ',' */
834 if ((temp = get_absolute_expression ()) < 0)
836 as_warn (".COMMon length (%ld.) <0! Ignored.", (long) temp);
837 ignore_rest_of_line ();
841 symbolP = symbol_find_or_make (name);
843 if (S_IS_DEFINED (symbolP))
845 as_bad ("Ignoring attempt to re-define symbol");
846 ignore_rest_of_line ();
849 if (S_GET_VALUE (symbolP))
851 if (S_GET_VALUE (symbolP) != (valueT) temp)
852 as_bad ("Length of .comm \"%s\" is already %ld. Not changed to %ld.",
853 S_GET_NAME (symbolP),
854 (long) S_GET_VALUE (symbolP),
859 S_SET_VALUE (symbolP, (valueT) temp);
860 S_SET_EXTERNAL (symbolP);
863 if ( (!temp) || !flagseen['1'])
864 S_GET_OTHER(symbolP) = const_flag;
865 #endif /* not OBJ_VMS */
866 know (symbolP->sy_frag == &zero_address_frag);
867 demand_empty_rest_of_line ();
877 temp = get_absolute_expression ();
880 section = text_section;
884 section = data_section;
886 subseg_set (section, (subsegT) temp);
891 demand_empty_rest_of_line ();
894 /* Handle the .appfile pseudo-op. This is automatically generated by
895 do_scrub_next_char when a preprocessor # line comment is seen with
896 a file name. This default definition may be overridden by the
897 object or CPU specific pseudo-ops. This function is also the
898 default definition for .file; the APPFILE argument is 1 for
899 .appfile, 0 for .file. */
908 /* Some assemblers tolerate immediately following '"' */
909 if ((s = demand_copy_string (&length)) != 0)
911 /* If this is a fake .appfile, a fake newline was inserted into
912 the buffer. Passing -2 to new_logical_line tells it to
914 new_logical_line (s, appfile ? -2 : -1);
915 demand_empty_rest_of_line ();
918 listing_source_file (s);
922 c_dot_file_symbol (s);
923 #endif /* OBJ_COFF */
929 /* Handle the .appline pseudo-op. This is automatically generated by
930 do_scrub_next_char when a preprocessor # line comment is seen.
931 This default definition may be overridden by the object or CPU
932 specific pseudo-ops. */
940 /* The given number is that of the next line. */
941 l = get_absolute_expression () - 1;
942 new_logical_line ((char *) NULL, l);
945 listing_source_line (l);
947 demand_empty_rest_of_line ();
954 long temp_repeat = 0;
956 register long temp_fill = 0;
960 temp_repeat = get_absolute_expression ();
961 if (*input_line_pointer == ',')
963 input_line_pointer++;
964 temp_size = get_absolute_expression ();
965 if (*input_line_pointer == ',')
967 input_line_pointer++;
968 temp_fill = get_absolute_expression ();
971 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
972 #define BSD_FILL_SIZE_CROCK_8 (8)
973 if (temp_size > BSD_FILL_SIZE_CROCK_8)
975 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
976 temp_size = BSD_FILL_SIZE_CROCK_8;
980 as_warn ("Size negative: .fill ignored.");
983 else if (temp_repeat <= 0)
985 as_warn ("Repeat < 0, .fill ignored");
989 if (temp_size && !need_pass_2)
991 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
992 memset (p, 0, (unsigned int) temp_size);
993 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
994 * flavoured AS. The following bizzare behaviour is to be
995 * compatible with above. I guess they tried to take up to 8
996 * bytes from a 4-byte expression and they forgot to sign
997 * extend. Un*x Sux. */
998 #define BSD_FILL_SIZE_CROCK_4 (4)
999 md_number_to_chars (p, (valueT) temp_fill,
1000 (temp_size > BSD_FILL_SIZE_CROCK_4
1001 ? BSD_FILL_SIZE_CROCK_4
1002 : (int) temp_size));
1003 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
1004 * but emits no error message because it seems a legal thing to do.
1005 * It is a degenerate case of .fill but could be emitted by a compiler.
1008 demand_empty_rest_of_line ();
1021 name = input_line_pointer;
1022 c = get_symbol_end ();
1023 symbolP = symbol_find_or_make (name);
1024 *input_line_pointer = c;
1026 S_SET_EXTERNAL (symbolP);
1029 input_line_pointer++;
1031 if (*input_line_pointer == '\n')
1036 demand_empty_rest_of_line ();
1040 s_lcomm (needs_align)
1041 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1042 (alignment); 0 if it was an ".lcomm" (2 args only) */
1045 register char *name;
1049 register symbolS *symbolP;
1050 segT current_seg = now_seg;
1051 subsegT current_subseg = now_subseg;
1052 const int max_alignment = 15;
1054 segT bss_seg = bss_section;
1056 name = input_line_pointer;
1057 c = get_symbol_end ();
1058 p = input_line_pointer;
1062 /* Accept an optional comma after the name. The comma used to be
1063 required, but Irix 5 cc does not generate it. */
1064 if (*input_line_pointer == ',')
1066 ++input_line_pointer;
1070 if (*input_line_pointer == '\n')
1072 as_bad ("Missing size expression");
1076 if ((temp = get_absolute_expression ()) < 0)
1078 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1079 ignore_rest_of_line ();
1083 #if defined (TC_MIPS) || defined (TC_ALPHA)
1084 #if defined (OBJ_ECOFF) || defined (OBJ_ELF)
1085 /* For MIPS and Alpha ECOFF or ELF, small objects are put in .sbss. */
1086 if (temp <= bfd_get_gp_size (stdoutput))
1088 bss_seg = subseg_new (".sbss", 1);
1089 seg_info (bss_seg)->bss = 1;
1098 if (*input_line_pointer != ',')
1100 as_bad ("Expected comma after size");
1101 ignore_rest_of_line ();
1104 input_line_pointer++;
1106 if (*input_line_pointer == '\n')
1108 as_bad ("Missing alignment");
1111 align = get_absolute_expression ();
1112 if (align > max_alignment)
1114 align = max_alignment;
1115 as_warn ("Alignment too large: %d. assumed.", align);
1120 as_warn ("Alignment negative. 0 assumed.");
1122 record_alignment (bss_seg, align);
1123 } /* if needs align */
1126 /* Assume some objects may require alignment on some systems. */
1130 align = ffs (temp) - 1;
1131 if (temp % (1 << align))
1138 symbolP = symbol_find_or_make (name);
1142 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1143 S_GET_OTHER (symbolP) == 0 &&
1144 S_GET_DESC (symbolP) == 0 &&
1145 #endif /* OBJ_AOUT or OBJ_BOUT */
1146 (S_GET_SEGMENT (symbolP) == bss_seg
1147 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1151 subseg_set (bss_seg, 1);
1154 frag_align (align, 0);
1155 /* detach from old frag */
1156 if (S_GET_SEGMENT (symbolP) == bss_seg)
1157 symbolP->sy_frag->fr_symbol = NULL;
1159 symbolP->sy_frag = frag_now;
1160 pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1164 S_SET_SEGMENT (symbolP, bss_seg);
1167 /* The symbol may already have been created with a preceding
1168 ".globl" directive -- be careful not to step on storage class
1169 in that case. Otherwise, set it to static. */
1170 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1172 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1174 #endif /* OBJ_COFF */
1178 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1181 subseg_set (current_seg, current_subseg);
1183 demand_empty_rest_of_line ();
1190 register char *name;
1194 register symbolS *symbolP;
1196 /* we permit ANY defined expression: BSD4.2 demands constants */
1197 name = input_line_pointer;
1198 c = get_symbol_end ();
1199 p = input_line_pointer;
1202 if (*input_line_pointer != ',')
1205 as_bad ("Expected comma after name \"%s\"", name);
1207 ignore_rest_of_line ();
1210 input_line_pointer++;
1212 if (exp.X_op != O_constant
1213 && exp.X_op != O_register)
1215 as_bad ("bad expression");
1216 ignore_rest_of_line ();
1220 symbolP = symbol_find_or_make (name);
1222 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1223 symbolP->sy_desc == 0) out of this test because coff doesn't have
1224 those fields, and I can't see when they'd ever be tripped. I
1225 don't think I understand why they were here so I may have
1226 introduced a bug. As recently as 1.37 didn't have this test
1227 anyway. xoxorich. */
1229 if (S_GET_SEGMENT (symbolP) == undefined_section
1230 && S_GET_VALUE (symbolP) == 0)
1232 /* The name might be an undefined .global symbol; be sure to
1233 keep the "external" bit. */
1234 S_SET_SEGMENT (symbolP,
1235 (exp.X_op == O_constant
1238 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1242 as_bad ("Symbol %s already defined", name);
1245 demand_empty_rest_of_line ();
1252 register segT segment;
1254 register long temp_fill;
1256 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1257 thing as a sub-segment-relative origin. Any absolute origin is
1258 given a warning, then assumed to be segment-relative. Any
1259 segmented origin expression ("foo+42") had better be in the right
1260 segment or the .org is ignored.
1262 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1263 we never know sub-segment sizes when we are reading code. BSD
1264 will crash trying to emit negative numbers of filler bytes in
1265 certain .orgs. We don't crash, but see as-write for that code.
1267 Don't make frag if need_pass_2==1. */
1268 segment = get_known_segmented_expression (&exp);
1269 if (*input_line_pointer == ',')
1271 input_line_pointer++;
1272 temp_fill = get_absolute_expression ();
1278 if (segment != now_seg && segment != absolute_section)
1279 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1280 segment_name (segment), segment_name (now_seg));
1281 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1282 exp.X_add_number, (char *) 0);
1284 } /* if (ok to make frag) */
1285 demand_empty_rest_of_line ();
1292 register char *name;
1293 register char delim;
1294 register char *end_name;
1295 register symbolS *symbolP;
1298 * Especial apologies for the random logic:
1299 * this just grew, and could be parsed much more simply!
1302 name = input_line_pointer;
1303 delim = get_symbol_end ();
1304 end_name = input_line_pointer;
1308 if (*input_line_pointer != ',')
1311 as_bad ("Expected comma after name \"%s\"", name);
1313 ignore_rest_of_line ();
1317 input_line_pointer++;
1320 if (name[0] == '.' && name[1] == '\0')
1322 /* Turn '. = mumble' into a .org mumble */
1323 register segT segment;
1327 segment = get_known_segmented_expression (&exp);
1331 if (segment != now_seg && segment != absolute_section)
1332 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1333 segment_name (segment),
1334 segment_name (now_seg));
1335 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1336 exp.X_add_number, (char *) 0);
1338 } /* if (ok to make frag) */
1344 if ((symbolP = symbol_find (name)) == NULL
1345 && (symbolP = md_undefined_symbol (name)) == NULL)
1347 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1349 /* "set" symbols are local unless otherwise specified. */
1350 SF_SET_LOCAL (symbolP);
1351 #endif /* OBJ_COFF */
1353 } /* make a new symbol */
1355 symbol_table_insert (symbolP);
1358 pseudo_set (symbolP);
1359 demand_empty_rest_of_line ();
1367 register long temp_fill;
1370 /* Just like .fill, but temp_size = 1 */
1371 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1373 temp_fill = get_absolute_expression ();
1377 input_line_pointer--; /* Backup over what was not a ','. */
1382 temp_repeat *= mult;
1384 if (temp_repeat <= 0)
1386 as_warn ("Repeat < 0, .space ignored");
1387 ignore_rest_of_line ();
1392 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1393 temp_repeat, (char *) 0);
1396 demand_empty_rest_of_line ();
1405 temp = get_absolute_expression ();
1406 subseg_set (text_section, (subsegT) temp);
1407 demand_empty_rest_of_line ();
1412 demand_empty_rest_of_line ()
1415 if (is_end_of_line[(unsigned char) *input_line_pointer])
1417 input_line_pointer++;
1421 ignore_rest_of_line ();
1423 /* Return having already swallowed end-of-line. */
1424 } /* Return pointing just after end-of-line. */
1427 ignore_rest_of_line () /* For suspect lines: gives warning. */
1429 if (!is_end_of_line[(unsigned char) *input_line_pointer])
1431 if (isprint (*input_line_pointer))
1432 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1433 *input_line_pointer);
1435 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1436 *input_line_pointer);
1437 while (input_line_pointer < buffer_limit
1438 && !is_end_of_line[(unsigned char) *input_line_pointer])
1440 input_line_pointer++;
1443 input_line_pointer++; /* Return pointing just after end-of-line. */
1444 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
1450 * In: Pointer to a symbol.
1451 * Input_line_pointer->expression.
1453 * Out: Input_line_pointer->just after any whitespace after expression.
1454 * Tried to set symbol to value of expression.
1455 * Will change symbols type, value, and frag;
1458 pseudo_set (symbolP)
1462 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1464 #endif /* OBJ_AOUT or OBJ_BOUT */
1466 know (symbolP); /* NULL pointer is logic error. */
1467 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1468 /* @@ Fix this right for BFD. */
1469 ext = S_IS_EXTERNAL (symbolP);
1470 #endif /* OBJ_AOUT or OBJ_BOUT */
1472 (void) expression (&exp);
1474 if (exp.X_op == O_illegal)
1475 as_bad ("illegal expression; zero assumed");
1476 else if (exp.X_op == O_absent)
1477 as_bad ("missing expression; zero assumed");
1478 else if (exp.X_op == O_big)
1479 as_bad ("%s number invalid; zero assumed",
1480 exp.X_add_number > 0 ? "bignum" : "floating point");
1481 else if (exp.X_op == O_subtract
1482 && (S_GET_SEGMENT (exp.X_add_symbol)
1483 == S_GET_SEGMENT (exp.X_op_symbol))
1484 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
1485 && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
1487 exp.X_op = O_constant;
1488 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
1489 - S_GET_VALUE (exp.X_op_symbol));
1497 exp.X_add_number = 0;
1500 S_SET_SEGMENT (symbolP, absolute_section);
1501 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1502 /* @@ Fix this right for BFD. */
1504 S_SET_EXTERNAL (symbolP);
1506 S_CLEAR_EXTERNAL (symbolP);
1507 #endif /* OBJ_AOUT or OBJ_BOUT */
1508 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1509 symbolP->sy_frag = &zero_address_frag;
1513 S_SET_SEGMENT (symbolP, reg_section);
1514 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1515 symbolP->sy_frag = &zero_address_frag;
1519 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section)
1520 symbolP->sy_value = exp;
1523 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (exp.X_add_symbol));
1524 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1525 /* @@ Fix this right for BFD! */
1527 S_SET_EXTERNAL (symbolP);
1529 S_CLEAR_EXTERNAL (symbolP);
1530 #endif /* OBJ_AOUT or OBJ_BOUT */
1531 S_SET_VALUE (symbolP,
1532 exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1533 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1538 /* The value is some complex expression.
1539 FIXME: Should we set the segment to anything? */
1540 symbolP->sy_value = exp;
1548 * CONStruct more frag of .bytes, or .words etc.
1549 * Should need_pass_2 be 1 then emit no frag(s).
1550 * This understands EXPRESSIONS.
1554 * This has a split personality. We use expression() to read the
1555 * value. We can detect if the value won't fit in a byte or word.
1556 * But we can't detect if expression() discarded significant digits
1557 * in the case of a long. Not worth the crocks required to fix it.
1560 /* Select a parser for cons expressions. */
1562 /* Some targets need to parse the expression in various fancy ways.
1563 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1564 (for example, the HPPA does this). Otherwise, you can define
1565 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1566 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1567 are defined, which is the normal case, then only simple expressions
1570 #ifndef TC_PARSE_CONS_EXPRESSION
1571 #ifdef BITFIELD_CONS_EXPRESSIONS
1572 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1574 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1577 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1579 parse_mri_cons PARAMS ((expressionS *exp));
1581 #ifdef REPEAT_CONS_EXPRESSIONS
1582 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1584 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1587 /* If we haven't gotten one yet, just call expression. */
1588 #ifndef TC_PARSE_CONS_EXPRESSION
1589 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1593 /* worker to do .byte etc statements */
1594 /* clobbers input_line_pointer, checks */
1598 register int nbytes; /* 1=.byte, 2=.word, 4=.long */
1602 if (is_it_end_of_statement ())
1604 demand_empty_rest_of_line ();
1610 TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
1611 emit_expr (&exp, (unsigned int) nbytes);
1613 while (*input_line_pointer++ == ',');
1615 input_line_pointer--; /* Put terminator back into stream. */
1616 demand_empty_rest_of_line ();
1619 /* Put the contents of expression EXP into the object file using
1620 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1623 emit_expr (exp, nbytes)
1625 unsigned int nbytes;
1629 valueT extra_digit = 0;
1631 /* Don't do anything if we are going to make another pass. */
1637 /* Handle a negative bignum. */
1639 && exp->X_add_number == 0
1640 && exp->X_add_symbol->sy_value.X_op == O_big
1641 && exp->X_add_symbol->sy_value.X_add_number > 0)
1644 unsigned long carry;
1646 exp = &exp->X_add_symbol->sy_value;
1648 /* Negate the bignum: one's complement each digit and add 1. */
1650 for (i = 0; i < exp->X_add_number; i++)
1654 next = (((~ (generic_bignum[i] & LITTLENUM_MASK))
1657 generic_bignum[i] = next & LITTLENUM_MASK;
1658 carry = next >> LITTLENUM_NUMBER_OF_BITS;
1661 /* We can ignore any carry out, because it will be handled by
1662 extra_digit if it is needed. */
1664 extra_digit = (valueT) -1;
1668 if (op == O_absent || op == O_illegal)
1670 as_warn ("zero assumed for missing expression");
1671 exp->X_add_number = 0;
1674 else if (op == O_big && exp->X_add_number <= 0)
1676 as_bad ("floating point number invalid; zero assumed");
1677 exp->X_add_number = 0;
1680 else if (op == O_register)
1682 as_warn ("register value used as expression");
1686 p = frag_more ((int) nbytes);
1688 #ifndef WORKING_DOT_WORD
1689 /* If we have the difference of two symbols in a word, save it on
1690 the broken_words list. See the code in write.c. */
1691 if (op == O_subtract && nbytes == 2)
1693 struct broken_word *x;
1695 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1696 x->next_broken_word = broken_words;
1699 x->word_goes_here = p;
1701 x->add = exp->X_add_symbol;
1702 x->sub = exp->X_op_symbol;
1703 x->addnum = exp->X_add_number;
1710 /* If we have an integer, but the number of bytes is too large to
1711 pass to md_number_to_chars, handle it as a bignum. */
1712 if (op == O_constant && nbytes > sizeof (valueT))
1717 if (! exp->X_unsigned && exp->X_add_number < 0)
1718 extra_digit = (valueT) -1;
1719 val = (valueT) exp->X_add_number;
1723 generic_bignum[gencnt] = val & LITTLENUM_MASK;
1724 val >>= LITTLENUM_NUMBER_OF_BITS;
1728 op = exp->X_op = O_big;
1729 exp->X_add_number = gencnt;
1732 if (op == O_constant)
1734 register valueT get;
1735 register valueT use;
1736 register valueT mask;
1737 register valueT unmask;
1739 /* JF << of >= number of bits in the object is undefined. In
1740 particular SPARC (Sun 4) has problems */
1741 if (nbytes >= sizeof (valueT))
1744 mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1746 unmask = ~mask; /* Do store these bits. */
1749 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1750 mask = ~(unmask >> 1); /* Includes sign bit now. */
1753 get = exp->X_add_number;
1755 if ((get & mask) != 0 && (get & mask) != mask)
1756 { /* Leading bits contain both 0s & 1s. */
1757 as_warn ("Value 0x%lx truncated to 0x%lx.", get, use);
1759 /* put bytes in right order. */
1760 md_number_to_chars (p, use, (int) nbytes);
1762 else if (op == O_big)
1765 LITTLENUM_TYPE *nums;
1767 know (nbytes % CHARS_PER_LITTLENUM == 0);
1769 size = exp->X_add_number * CHARS_PER_LITTLENUM;
1772 as_warn ("Bignum truncated to %d bytes", nbytes);
1776 if (target_big_endian)
1778 while (nbytes > size)
1780 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1781 nbytes -= CHARS_PER_LITTLENUM;
1782 p += CHARS_PER_LITTLENUM;
1785 nums = generic_bignum + size / CHARS_PER_LITTLENUM;
1789 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1790 size -= CHARS_PER_LITTLENUM;
1791 p += CHARS_PER_LITTLENUM;
1796 nums = generic_bignum;
1799 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1801 size -= CHARS_PER_LITTLENUM;
1802 p += CHARS_PER_LITTLENUM;
1803 nbytes -= CHARS_PER_LITTLENUM;
1808 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1809 nbytes -= CHARS_PER_LITTLENUM;
1810 p += CHARS_PER_LITTLENUM;
1816 md_number_to_chars (p, (valueT) 0, (int) nbytes);
1818 /* Now we need to generate a fixS to record the symbol value.
1819 This is easy for BFD. For other targets it can be more
1820 complex. For very complex cases (currently, the HPPA and
1821 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1822 want. For simpler cases, you can define TC_CONS_RELOC to be
1823 the name of the reloc code that should be stored in the fixS.
1824 If neither is defined, the code uses NO_RELOC if it is
1825 defined, and otherwise uses 0. */
1827 #ifdef BFD_ASSEMBLER
1828 #ifdef TC_CONS_FIX_NEW
1829 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1831 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1832 /* @@ Should look at CPU word size. */
1833 nbytes == 2 ? BFD_RELOC_16
1834 : nbytes == 8 ? BFD_RELOC_64
1838 #ifdef TC_CONS_FIX_NEW
1839 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1841 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1842 it is defined, otherwise use NO_RELOC if it is defined,
1844 #ifndef TC_CONS_RELOC
1846 #define TC_CONS_RELOC NO_RELOC
1848 #define TC_CONS_RELOC 0
1851 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1853 #endif /* TC_CONS_FIX_NEW */
1854 #endif /* BFD_ASSEMBLER */
1858 #ifdef BITFIELD_CONS_EXPRESSIONS
1860 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1861 w:x,y:z, where w and y are bitwidths and x and y are values. They
1862 then pack them all together. We do a little better in that we allow
1863 them in words, longs, etc. and we'll pack them in target byte order
1866 The rules are: pack least significat bit first, if a field doesn't
1867 entirely fit, put it in the next unit. Overflowing the bitfield is
1868 explicitly *not* even a warning. The bitwidth should be considered
1871 To use this function the tc-XXX.h file should define
1872 BITFIELD_CONS_EXPRESSIONS. */
1875 parse_bitfield_cons (exp, nbytes)
1877 unsigned int nbytes;
1879 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1880 char *hold = input_line_pointer;
1882 (void) expression (exp);
1884 if (*input_line_pointer == ':')
1890 unsigned long width;
1892 if (*input_line_pointer != ':')
1894 input_line_pointer = hold;
1896 } /* next piece is not a bitfield */
1898 /* In the general case, we can't allow
1899 full expressions with symbol
1900 differences and such. The relocation
1901 entries for symbols not defined in this
1902 assembly would require arbitrary field
1903 widths, positions, and masks which most
1904 of our current object formats don't
1907 In the specific case where a symbol
1908 *is* defined in this assembly, we
1909 *could* build fixups and track it, but
1910 this could lead to confusion for the
1911 backends. I'm lazy. I'll take any
1912 SEG_ABSOLUTE. I think that means that
1913 you can use a previous .set or
1914 .equ type symbol. xoxorich. */
1916 if (exp->X_op == O_absent)
1918 as_warn ("using a bit field width of zero");
1919 exp->X_add_number = 0;
1920 exp->X_op = O_constant;
1921 } /* implied zero width bitfield */
1923 if (exp->X_op != O_constant)
1925 *input_line_pointer = '\0';
1926 as_bad ("field width \"%s\" too complex for a bitfield", hold);
1927 *input_line_pointer = ':';
1928 demand_empty_rest_of_line ();
1932 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1934 as_warn ("field width %lu too big to fit in %d bytes: truncated to %d bits",
1935 width, nbytes, (BITS_PER_CHAR * nbytes));
1936 width = BITS_PER_CHAR * nbytes;
1939 if (width > bits_available)
1941 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1942 input_line_pointer = hold;
1943 exp->X_add_number = value;
1947 hold = ++input_line_pointer; /* skip ':' */
1949 (void) expression (exp);
1950 if (exp->X_op != O_constant)
1952 char cache = *input_line_pointer;
1954 *input_line_pointer = '\0';
1955 as_bad ("field value \"%s\" too complex for a bitfield", hold);
1956 *input_line_pointer = cache;
1957 demand_empty_rest_of_line ();
1961 value |= ((~(-1 << width) & exp->X_add_number)
1962 << ((BITS_PER_CHAR * nbytes) - bits_available));
1964 if ((bits_available -= width) == 0
1965 || is_it_end_of_statement ()
1966 || *input_line_pointer != ',')
1969 } /* all the bitfields we're gonna get */
1971 hold = ++input_line_pointer;
1972 (void) expression (exp);
1973 } /* forever loop */
1975 exp->X_add_number = value;
1976 exp->X_op = O_constant;
1977 exp->X_unsigned = 1;
1978 } /* if looks like a bitfield */
1979 } /* parse_bitfield_cons() */
1981 #endif /* BITFIELD_CONS_EXPRESSIONS */
1986 parse_mri_cons (exp, nbytes)
1988 unsigned int nbytes;
1990 if (*input_line_pointer == '\'')
1992 /* An MRI style string, cut into as many bytes as will fit into
1993 a nbyte chunk, left justify if necessary, and separate with
1994 commas so we can try again later */
1996 unsigned int result = 0;
1997 input_line_pointer++;
1998 for (scan = 0; scan < nbytes; scan++)
2000 if (*input_line_pointer == '\'')
2002 if (input_line_pointer[1] == '\'')
2004 input_line_pointer++;
2009 result = (result << 8) | (*input_line_pointer++);
2013 while (scan < nbytes)
2018 /* Create correct expression */
2019 exp->X_op = O_constant;
2020 exp->X_add_number = result;
2021 /* Fake it so that we can read the next char too */
2022 if (input_line_pointer[0] != '\'' ||
2023 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
2025 input_line_pointer -= 2;
2026 input_line_pointer[0] = ',';
2027 input_line_pointer[1] = '\'';
2030 input_line_pointer++;
2038 #ifdef REPEAT_CONS_EXPRESSIONS
2040 /* Parse a repeat expression for cons. This is used by the MIPS
2041 assembler. The format is NUMBER:COUNT; NUMBER appears in the
2042 object file COUNT times.
2044 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
2047 parse_repeat_cons (exp, nbytes)
2049 unsigned int nbytes;
2056 if (*input_line_pointer != ':')
2058 /* No repeat count. */
2062 ++input_line_pointer;
2063 expression (&count);
2064 if (count.X_op != O_constant
2065 || count.X_add_number <= 0)
2067 as_warn ("Unresolvable or nonpositive repeat count; using 1");
2071 /* The cons function is going to output this expression once. So we
2072 output it count - 1 times. */
2073 for (i = count.X_add_number - 1; i > 0; i--)
2074 emit_expr (exp, nbytes);
2077 #endif /* REPEAT_CONS_EXPRESSIONS */
2082 * CONStruct some more frag chars of .floats .ffloats etc.
2083 * Makes 0 or more new frags.
2084 * If need_pass_2 == 1, no frags are emitted.
2085 * This understands only floating literals, not expressions. Sorry.
2087 * A floating constant is defined by atof_generic(), except it is preceded
2088 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2089 * reading, I decided to be incompatible. This always tries to give you
2090 * rounded bits to the precision of the pseudo-op. Former AS did premature
2091 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2092 * a choice of 2 flavours of noise according to which of 2 floating-point
2093 * scanners you directed AS to use.
2095 * In: input_line_pointer->whitespace before, or '0' of flonum.
2100 float_cons (float_type)
2101 /* Clobbers input_line-pointer, checks end-of-line. */
2102 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2105 int length; /* Number of chars in an object. */
2106 register char *err; /* Error from scanning floating literal. */
2107 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2109 if (is_it_end_of_statement ())
2111 demand_empty_rest_of_line ();
2117 /* input_line_pointer->1st char of a flonum (we hope!). */
2120 /* Skip any 0{letter} that may be present. Don't even check if the
2121 * letter is legal. Someone may invent a "z" format and this routine
2122 * has no use for such information. Lusers beware: you get
2123 * diagnostics if your input is ill-conditioned.
2125 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2126 input_line_pointer += 2;
2128 err = md_atof (float_type, temp, &length);
2129 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2133 as_bad ("Bad floating literal: %s", err);
2134 ignore_rest_of_line ();
2144 #ifdef REPEAT_CONS_EXPRESSIONS
2145 if (*input_line_pointer == ':')
2147 expressionS count_exp;
2149 ++input_line_pointer;
2150 expression (&count_exp);
2151 if (count_exp.X_op != O_constant
2152 || count_exp.X_add_number <= 0)
2154 as_warn ("unresolvable or nonpositive repeat count; using 1");
2157 count = count_exp.X_add_number;
2161 while (--count >= 0)
2163 p = frag_more (length);
2164 memcpy (p, temp, (unsigned int) length);
2169 while (*input_line_pointer++ == ',');
2171 --input_line_pointer; /* Put terminator back into stream. */
2172 demand_empty_rest_of_line ();
2173 } /* float_cons() */
2178 * We read 0 or more ',' seperated, double-quoted strings.
2180 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2185 stringer (append_zero) /* Worker to do .ascii etc statements. */
2186 /* Checks end-of-line. */
2187 register int append_zero; /* 0: don't append '\0', else 1 */
2189 register unsigned int c;
2192 * The following awkward logic is to parse ZERO or more strings,
2193 * comma seperated. Recall a string expression includes spaces
2194 * before the opening '\"' and spaces after the closing '\"'.
2195 * We fake a leading ',' if there is (supposed to be)
2196 * a 1st, expression. We keep demanding expressions for each
2199 if (is_it_end_of_statement ())
2201 c = 0; /* Skip loop. */
2202 ++input_line_pointer; /* Compensate for end of loop. */
2206 c = ','; /* Do loop. */
2208 while (c == ',' || c == '<' || c == '"')
2211 switch (*input_line_pointer)
2214 ++input_line_pointer; /*->1st char of string. */
2215 while (is_a_char (c = next_char_of_string ()))
2217 FRAG_APPEND_1_CHAR (c);
2221 FRAG_APPEND_1_CHAR (0);
2223 know (input_line_pointer[-1] == '\"');
2226 input_line_pointer++;
2227 c = get_single_number ();
2228 FRAG_APPEND_1_CHAR (c);
2229 if (*input_line_pointer != '>')
2231 as_bad ("Expected <nn>");
2233 input_line_pointer++;
2236 input_line_pointer++;
2240 c = *input_line_pointer;
2243 demand_empty_rest_of_line ();
2246 /* FIXME-SOMEDAY: I had trouble here on characters with the
2247 high bits set. We'll probably also have trouble with
2248 multibyte chars, wide chars, etc. Also be careful about
2249 returning values bigger than 1 byte. xoxorich. */
2252 next_char_of_string ()
2254 register unsigned int c;
2256 c = *input_line_pointer++ & CHAR_MASK;
2264 switch (c = *input_line_pointer++)
2294 break; /* As itself. */
2310 for (i = 0, number = 0; isdigit (c) && i < 3; c = *input_line_pointer++, i++)
2312 number = number * 8 + c - '0';
2316 --input_line_pointer;
2325 c = *input_line_pointer++;
2326 while (isxdigit (c))
2329 number = number * 16 + c - '0';
2330 else if (isupper (c))
2331 number = number * 16 + c - 'A' + 10;
2333 number = number * 16 + c - 'a' + 10;
2334 c = *input_line_pointer++;
2337 --input_line_pointer;
2342 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2343 as_warn ("Unterminated string: Newline inserted.");
2349 #ifdef ONLY_STANDARD_ESCAPES
2350 as_bad ("Bad escaped character in string, '?' assumed");
2352 #endif /* ONLY_STANDARD_ESCAPES */
2355 } /* switch on escaped char */
2360 } /* switch on char */
2362 } /* next_char_of_string() */
2365 get_segmented_expression (expP)
2366 register expressionS *expP;
2368 register segT retval;
2370 retval = expression (expP);
2371 if (expP->X_op == O_illegal
2372 || expP->X_op == O_absent
2373 || expP->X_op == O_big)
2375 as_bad ("expected address expression; zero assumed");
2376 expP->X_op = O_constant;
2377 expP->X_add_number = 0;
2378 retval = absolute_section;
2384 get_known_segmented_expression (expP)
2385 register expressionS *expP;
2387 register segT retval;
2389 if ((retval = get_segmented_expression (expP)) == undefined_section)
2391 /* There is no easy way to extract the undefined symbol from the
2393 if (expP->X_add_symbol != NULL
2394 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
2395 as_warn ("symbol \"%s\" undefined; zero assumed",
2396 S_GET_NAME (expP->X_add_symbol));
2398 as_warn ("some symbol undefined; zero assumed");
2399 retval = absolute_section;
2400 expP->X_op = O_constant;
2401 expP->X_add_number = 0;
2403 know (retval == absolute_section || SEG_NORMAL (retval));
2405 } /* get_known_segmented_expression() */
2408 get_absolute_expression ()
2413 if (exp.X_op != O_constant)
2415 if (exp.X_op != O_absent)
2416 as_bad ("bad absolute expression; zero assumed");
2417 exp.X_add_number = 0;
2419 return exp.X_add_number;
2422 char /* return terminator */
2423 get_absolute_expression_and_terminator (val_pointer)
2424 long *val_pointer; /* return value of expression */
2426 /* FIXME: val_pointer should probably be offsetT *. */
2427 *val_pointer = (long) get_absolute_expression ();
2428 return (*input_line_pointer++);
2432 * demand_copy_C_string()
2434 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2435 * Give a warning if that happens.
2438 demand_copy_C_string (len_pointer)
2443 if ((s = demand_copy_string (len_pointer)) != 0)
2447 for (len = *len_pointer;
2456 as_bad ("This string may not contain \'\\0\'");
2464 * demand_copy_string()
2466 * Demand string, but return a safe (=private) copy of the string.
2467 * Return NULL if we can't read a string here.
2470 demand_copy_string (lenP)
2473 register unsigned int c;
2479 if (*input_line_pointer == '\"')
2481 input_line_pointer++; /* Skip opening quote. */
2483 while (is_a_char (c = next_char_of_string ()))
2485 obstack_1grow (¬es, c);
2488 /* JF this next line is so demand_copy_C_string will return a null
2489 termanated string. */
2490 obstack_1grow (¬es, '\0');
2491 retval = obstack_finish (¬es);
2495 as_warn ("Missing string");
2497 ignore_rest_of_line ();
2501 } /* demand_copy_string() */
2504 * is_it_end_of_statement()
2506 * In: Input_line_pointer->next character.
2508 * Do: Skip input_line_pointer over all whitespace.
2510 * Out: 1 if input_line_pointer->end-of-line.
2513 is_it_end_of_statement ()
2516 return (is_end_of_line[(unsigned char) *input_line_pointer]);
2517 } /* is_it_end_of_statement() */
2523 register symbolS *symbolP; /* symbol we are working with */
2525 input_line_pointer++;
2526 if (*input_line_pointer == '=')
2527 input_line_pointer++;
2529 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2530 input_line_pointer++;
2532 if (sym_name[0] == '.' && sym_name[1] == '\0')
2534 /* Turn '. = mumble' into a .org mumble */
2535 register segT segment;
2539 segment = get_known_segmented_expression (&exp);
2542 if (segment != now_seg && segment != absolute_section)
2543 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2544 segment_name (segment),
2545 segment_name (now_seg));
2546 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2547 exp.X_add_number, (char *) 0);
2549 } /* if (ok to make frag) */
2553 symbolP = symbol_find_or_make (sym_name);
2554 pseudo_set (symbolP);
2558 /* .include -- include a file at this point. */
2571 filename = demand_copy_string (&i);
2572 demand_empty_rest_of_line ();
2573 path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
2574 for (i = 0; i < include_dir_count; i++)
2576 strcpy (path, include_dirs[i]);
2578 strcat (path, filename);
2579 if (0 != (try = fopen (path, FOPEN_RT)))
2588 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2589 newbuf = input_scrub_include_file (path, input_line_pointer);
2590 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2594 add_include_dir (path)
2599 if (include_dir_count == 0)
2601 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2602 include_dirs[0] = "."; /* Current dir */
2603 include_dir_count = 2;
2607 include_dir_count++;
2608 include_dirs = (char **) realloc (include_dirs,
2609 include_dir_count * sizeof (*include_dirs));
2612 include_dirs[include_dir_count - 1] = path; /* New one */
2615 if (i > include_dir_maxlen)
2616 include_dir_maxlen = i;
2617 } /* add_include_dir() */
2623 while (!is_end_of_line[(unsigned char) *input_line_pointer])
2625 ++input_line_pointer;
2627 ++input_line_pointer;