1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991, 1993, 1994
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to
19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
23 change this a bit. But then, GNU isn't
24 spozed to run on your machine anyway.
25 (RMS is so shortsighted sometimes.)
28 #define MASK_CHAR ((int)(unsigned char)-1)
32 /* This is the largest known floating point format (for now). It will
33 grow when we do 4361 style flonums. */
35 #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
37 /* Routines that read assembler source text to build spagetti in memory.
38 Another group of these functions is in the expr.c module. */
49 #ifndef TC_START_LABEL
50 #define TC_START_LABEL(x,y) (x==':')
53 /* The NOP_OPCODE is for the alignment fill value.
54 * fill it a nop instruction so that the disassembler does not choke
58 #define NOP_OPCODE 0x00
61 char *input_line_pointer; /*->next char of source file to parse. */
63 int generate_asm_line_stab = 0; /* flag to generate line stab for .s file */
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!)! */
72 /* The m88k unfortunately uses @ as a label beginner. */
77 /* The RS/6000 assembler uses {,},[,] as parts of symbol names. */
82 /* The Delta 68k assembler permits % inside label names. */
86 /* used by is_... macros. our ctype[] */
87 const char lex_type[256] =
89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
91 0, 0, 0, 0, 3, LEX_PCT, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
92 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
93 LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
94 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, 0, 3, /* PQRSTUVWXYZ[\]^_ */
95 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
96 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, 0, 0, /* pqrstuvwxyz{|}~. */
97 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
98 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
99 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
100 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
101 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
102 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
103 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
109 * Out: 1 if this character ends a line.
112 char is_end_of_line[256] =
115 _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
117 _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
119 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
121 _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
122 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
124 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
125 _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
127 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
128 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
129 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
130 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
131 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
132 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
133 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
134 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
135 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
139 /* Functions private to this file. */
141 static char *buffer; /* 1st char of each buffer of lines is here. */
142 static char *buffer_limit; /*->1 + last char in buffer. */
144 int target_big_endian;
146 static char *old_buffer; /* JF a hack */
147 static char *old_input;
148 static char *old_limit;
150 /* Variables for handling include file directory list. */
152 char **include_dirs; /* List of pointers to directories to
153 search for .include's */
154 int include_dir_count; /* How many are in the list */
155 int include_dir_maxlen = 1;/* Length of longest in list */
157 #ifndef WORKING_DOT_WORD
158 struct broken_word *broken_words;
159 int new_broken_words;
162 char *demand_copy_string PARAMS ((int *lenP));
163 int is_it_end_of_statement PARAMS ((void));
164 static segT get_segmented_expression PARAMS ((expressionS *expP));
165 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
166 static void pobegin PARAMS ((void));
175 obj_read_begin_hook ();
177 /* Something close -- but not too close -- to a multiple of 1024.
178 The debugging malloc I'm using has 24 bytes of overhead. */
179 obstack_begin (¬es, 5090);
180 obstack_begin (&cond_obstack, 990);
182 /* Use machine dependent syntax */
183 for (p = line_separator_chars; *p; p++)
184 is_end_of_line[(unsigned char) *p] = 1;
185 /* Use more. FIXME-SOMEDAY. */
188 /* set up pseudo-op tables */
190 struct hash_control *po_hash;
192 static const pseudo_typeS potable[] =
194 {"abort", s_abort, 0},
195 {"align", s_align_ptwo, 0},
196 {"ascii", stringer, 0},
197 {"asciz", stringer, 1},
206 {"double", float_cons, 'd'},
208 {"eject", listing_eject, 0}, /* Formfeed listing */
211 {"endif", s_endif, 0},
216 {"extern", s_ignore, 0}, /* We treat all undef as ext */
217 {"appfile", s_app_file, 1},
218 {"appline", s_app_line, 0},
219 {"file", s_app_file, 0},
221 {"float", float_cons, 'f'},
222 {"global", s_globl, 0},
223 {"globl", s_globl, 0},
226 {"ifdef", s_ifdef, 0},
227 {"ifeqs", s_ifeqs, 0},
228 {"ifndef", s_ifdef, 1},
229 {"ifnes", s_ifeqs, 1},
230 {"ifnotdef", s_ifdef, 1},
231 {"include", s_include, 0},
233 {"lcomm", s_lcomm, 0},
234 {"lflags", listing_flags, 0}, /* Listing flags */
235 {"list", listing_list, 1}, /* Turn listing on */
238 {"nolist", listing_list, 0}, /* Turn listing off */
241 {"psize", listing_psize, 0}, /* set paper size */
244 {"sbttl", listing_title, 1}, /* Subtitle of listing */
249 {"single", float_cons, 'f'},
251 {"space", s_space, 0},
252 {"stabd", s_stab, 'd'},
253 {"stabn", s_stab, 'n'},
254 {"stabs", s_stab, 's'},
255 {"string", stringer, 1},
259 /* This is for gcc to use. It's only just been added (2/94), so gcc
260 won't be able to use it for a while -- probably a year or more.
261 But once this has been released, check with gcc maintainers
262 before deleting it or even changing the spelling. */
263 {"this_GCC_requires_the_GNU_assembler", s_ignore, 0},
264 /* If we're folding case -- done for some targets, not necessarily
265 all -- the above string in an input file will be converted to
266 this one. Match it either way... */
267 {"this_gcc_requires_the_gnu_assembler", s_ignore, 0},
269 {"title", listing_title, 0}, /* Listing title */
273 {"xstabs", s_xstab, 's'},
275 {"zero", s_space, 0},
276 {NULL} /* end sentinel */
282 const char *errtxt; /* error text */
283 const pseudo_typeS *pop;
285 po_hash = hash_new ();
287 /* Do the target-specific pseudo ops. */
288 for (pop = md_pseudo_table; pop->poc_name; pop++)
290 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
293 as_fatal ("error constructing md pseudo-op table");
297 /* Now object specific. Skip any that were in the target table. */
298 for (pop = obj_pseudo_table; pop->poc_name; pop++)
300 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
303 if (!strcmp (errtxt, "exists"))
305 #ifdef DIE_ON_OVERRIDES
306 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
307 #endif /* DIE_ON_OVERRIDES */
308 continue; /* OK if target table overrides. */
312 as_fatal ("error constructing obj pseudo-op table");
313 } /* if overridden */
317 /* Now portable ones. Skip any that we've seen already. */
318 for (pop = potable; pop->poc_name; pop++)
320 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
323 if (!strcmp (errtxt, "exists"))
325 #ifdef DIE_ON_OVERRIDES
326 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
327 #endif /* DIE_ON_OVERRIDES */
328 continue; /* OK if target table overrides. */
332 as_fatal ("error constructing obj pseudo-op table");
333 } /* if overridden */
340 #define HANDLE_CONDITIONAL_ASSEMBLY() \
341 if (ignore_input ()) \
343 while (! is_end_of_line[(unsigned char) *input_line_pointer++]) \
344 if (input_line_pointer == buffer_limit) \
350 /* read_a_source_file()
352 * We read the file, putting things into a web that
353 * represents what we have been reading.
356 read_a_source_file (name)
360 register char *s; /* string of symbol, '\0' appended */
364 buffer = input_scrub_new_file (name);
367 listing_newline ("");
369 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
370 { /* We have another line to parse. */
371 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
372 contin: /* JF this goto is my fault I admit it.
373 Someone brave please re-write the whole
374 input section here? Pleeze??? */
375 while (input_line_pointer < buffer_limit)
377 /* We have more of this buffer to parse. */
380 * We now have input_line_pointer->1st char of next line.
381 * If input_line_pointer [-1] == '\n' then we just
382 * scanned another line: so bump line counters.
384 if (is_end_of_line[(unsigned char) input_line_pointer[-1]])
386 if (input_line_pointer[-1] == '\n')
387 bump_line_counters ();
389 #if defined (MRI) || defined (LABELS_WITHOUT_COLONS)
390 /* Text at the start of a line must be a label, we run down
391 and stick a colon in. */
392 if (is_name_beginner (*input_line_pointer))
394 char *line_start = input_line_pointer;
395 char c = get_symbol_end ();
397 *input_line_pointer = c;
399 input_line_pointer++;
407 * We are at the begining of a line, or similar place.
408 * We expect a well-formed assembler statement.
409 * A "symbol-name:" is a statement.
411 * Depending on what compiler is used, the order of these tests
412 * may vary to catch most common case 1st.
413 * Each test is independent of all other tests at the (top) level.
414 * PLEASE make a compiler that doesn't use this assembler.
415 * It is crufty to waste a compiler's time encoding things for this
416 * assembler, which then wastes more time decoding it.
417 * (And communicating via (linear) files is silly!
418 * If you must pass stuff, please pass a tree!)
420 if ((c = *input_line_pointer++) == '\t'
425 c = *input_line_pointer++;
427 know (c != ' '); /* No further leading whitespace. */
430 * C is the 1st significant character.
431 * Input_line_pointer points after that character.
433 if (is_name_beginner (c))
435 /* want user-defined label or pseudo/opcode */
436 HANDLE_CONDITIONAL_ASSEMBLY ();
438 s = --input_line_pointer;
439 c = get_symbol_end (); /* name's delimiter */
441 * C is character after symbol.
442 * That character's place in the input line is now '\0'.
443 * S points to the beginning of the symbol.
444 * [In case of pseudo-op, s->'.'.]
445 * Input_line_pointer->'\0' where c was.
447 if (TC_START_LABEL(c, input_line_pointer))
449 colon (s); /* user-defined label */
450 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
451 /* Input_line_pointer->after ':'. */
457 || (input_line_pointer[1] == '='
458 #ifdef TC_EQUAL_IN_INSN
459 && ! TC_EQUAL_IN_INSN (c, input_line_pointer)
464 demand_empty_rest_of_line ();
467 { /* expect pseudo-op or machine instruction */
469 if (!done_pseudo (s))
475 #define IGNORE_OPCODE_CASE
476 #ifdef IGNORE_OPCODE_CASE
489 /* The m88k uses pseudo-ops without a period. */
490 pop = (pseudo_typeS *) hash_find (po_hash, s);
491 if (pop != NULL && pop->poc_handler == NULL)
495 if (pop != NULL || *s == '.')
500 * WARNING: c has next char, which may be end-of-line.
501 * We lookup the pseudo-op table with s+1 because we
502 * already know that the pseudo-op begins with a '.'.
506 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
508 /* Print the error msg now, while we still can */
511 as_bad ("Unknown pseudo-op: `%s'", s);
512 *input_line_pointer = c;
517 /* Put it back for error messages etc. */
518 *input_line_pointer = c;
519 /* The following skip of whitespace is compulsory.
520 A well shaped space is sometimes all that separates
521 keyword from operands. */
522 if (c == ' ' || c == '\t')
523 input_line_pointer++;
525 * Input_line is restored.
526 * Input_line_pointer->1st non-blank char
527 * after pseudo-operation.
529 (*pop->poc_handler) (pop->poc_val);
533 { /* machine instruction */
534 /* WARNING: c has char, which may be end-of-line. */
535 /* Also: input_line_pointer->`\0` where c was. */
536 *input_line_pointer = c;
537 while (!is_end_of_line[(unsigned char) *input_line_pointer]
538 #ifdef TC_EOL_IN_INSN
539 || TC_EOL_IN_INSN (input_line_pointer)
543 input_line_pointer++;
546 c = *input_line_pointer;
547 *input_line_pointer = '\0';
549 #ifdef OBJ_GENERATE_ASM_LINE_STAB
550 if (generate_asm_line_stab)
554 as_where (&s, &lineno);
555 OBJ_GENERATE_ASM_LINE_STAB (lineno);
559 md_assemble (s); /* Assemble 1 instruction. */
561 *input_line_pointer++ = c;
563 /* We resume loop AFTER the end-of-line from
568 } /* if (is_name_beginner(c) */
571 /* Empty statement? */
572 if (is_end_of_line[(unsigned char) c])
575 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
578 /* local label ("4:") */
579 char *backup = input_line_pointer;
581 HANDLE_CONDITIONAL_ASSEMBLY ();
585 while (isdigit (*input_line_pointer))
587 temp = (temp * 10) + *input_line_pointer - '0';
588 ++input_line_pointer;
589 } /* read the whole number */
591 #ifdef LOCAL_LABELS_DOLLAR
592 if (*input_line_pointer == '$'
593 && *(input_line_pointer + 1) == ':')
595 input_line_pointer += 2;
597 if (dollar_label_defined (temp))
599 as_fatal ("label \"%d$\" redefined", temp);
602 define_dollar_label (temp);
603 colon (dollar_label_name (temp, 0));
606 #endif /* LOCAL_LABELS_DOLLAR */
608 #ifdef LOCAL_LABELS_FB
609 if (*input_line_pointer++ == ':')
611 fb_label_instance_inc (temp);
612 colon (fb_label_name (temp, 0));
615 #endif /* LOCAL_LABELS_FB */
617 input_line_pointer = backup;
618 } /* local label ("4:") */
619 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
621 if (c && strchr (line_comment_chars, c))
622 { /* Its a comment. Better say APP or NO_APP */
626 unsigned int new_length;
628 extern char *scrub_string, *scrub_last_string;
630 bump_line_counters ();
631 s = input_line_pointer;
632 if (strncmp (s, "APP\n", 4))
633 continue; /* We ignore it */
636 ends = strstr (s, "#NO_APP\n");
640 unsigned int tmp_len;
643 /* The end of the #APP wasn't in this buffer. We
644 keep reading in buffers until we find the #NO_APP
645 that goes with this #APP There is one. The specs
647 tmp_len = buffer_limit - s;
648 tmp_buf = xmalloc (tmp_len + 1);
649 memcpy (tmp_buf, s, tmp_len);
652 new_tmp = input_scrub_next_buffer (&buffer);
656 buffer_limit = new_tmp;
657 input_line_pointer = buffer;
658 ends = strstr (buffer, "#NO_APP\n");
662 num = buffer_limit - buffer;
664 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
665 memcpy (tmp_buf + tmp_len, buffer, num);
670 input_line_pointer = ends ? ends + 8 : NULL;
678 input_line_pointer = ends + 8;
680 new_buf = xmalloc (100);
685 scrub_last_string = ends;
690 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
694 if (new_tmp == new_buf + new_length)
696 new_buf = xrealloc (new_buf, new_length + 100);
697 new_tmp = new_buf + new_length;
705 old_input = input_line_pointer;
706 old_limit = buffer_limit;
708 input_line_pointer = new_buf;
709 buffer_limit = new_tmp;
713 HANDLE_CONDITIONAL_ASSEMBLY ();
715 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
716 input_line_pointer--; /* Report unknown char as ignored. */
717 ignore_rest_of_line ();
718 } /* while (input_line_pointer<buffer_limit) */
721 bump_line_counters ();
725 input_line_pointer = old_input;
726 buffer_limit = old_limit;
731 } /* while (more buffers to scan) */
732 input_scrub_close (); /* Close the input file */
740 as_fatal (".abort detected. Abandoning ship.");
743 /* Guts of .align directive. */
750 md_do_align (n, fill, just_record_alignment);
754 /* @@ Fix this right for BFD! */
756 static char nop_opcode = NOP_OPCODE;
758 if (now_seg != data_section && now_seg != bss_section)
767 /* Only make a frag if we HAVE to. . . */
768 if (n && !need_pass_2)
769 frag_align (n, *fill);
772 just_record_alignment:
775 record_alignment (now_seg, n);
778 /* For machines where ".align 4" means align to a 4 byte boundary. */
783 register unsigned int temp;
786 unsigned long max_alignment = 1 << 15;
788 if (is_end_of_line[(unsigned char) *input_line_pointer])
789 temp = arg; /* Default value from pseudo-op table */
791 temp = get_absolute_expression ();
793 if (temp > max_alignment)
795 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
798 /* For the sparc, `.align (1<<n)' actually means `.align n' so we
799 have to convert it. */
802 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
806 as_bad ("Alignment not a power of 2");
809 if (*input_line_pointer == ',')
811 input_line_pointer++;
812 temp_fill = get_absolute_expression ();
813 do_align (temp, &temp_fill);
816 do_align (temp, (char *) 0);
818 demand_empty_rest_of_line ();
821 /* For machines where ".align 4" means align to 2**4 boundary. */
823 s_align_ptwo (ignore)
828 long max_alignment = 15;
830 temp = get_absolute_expression ();
831 if (temp > max_alignment)
832 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
835 as_bad ("Alignment negative. 0 assumed.");
838 if (*input_line_pointer == ',')
840 input_line_pointer++;
841 temp_fill = get_absolute_expression ();
842 do_align (temp, &temp_fill);
845 do_align (temp, (char *) 0);
847 demand_empty_rest_of_line ();
858 register symbolS *symbolP;
860 name = input_line_pointer;
861 c = get_symbol_end ();
862 /* just after name is now '\0' */
863 p = input_line_pointer;
866 if (*input_line_pointer != ',')
868 as_bad ("Expected comma after symbol-name: rest of line ignored.");
869 ignore_rest_of_line ();
872 input_line_pointer++; /* skip ',' */
873 if ((temp = get_absolute_expression ()) < 0)
875 as_warn (".COMMon length (%ld.) <0! Ignored.", (long) temp);
876 ignore_rest_of_line ();
880 symbolP = symbol_find_or_make (name);
882 if (S_IS_DEFINED (symbolP))
884 as_bad ("Ignoring attempt to re-define symbol `%s'.",
885 S_GET_NAME (symbolP));
886 ignore_rest_of_line ();
889 if (S_GET_VALUE (symbolP))
891 if (S_GET_VALUE (symbolP) != (valueT) temp)
892 as_bad ("Length of .comm \"%s\" is already %ld. Not changed to %ld.",
893 S_GET_NAME (symbolP),
894 (long) S_GET_VALUE (symbolP),
899 S_SET_VALUE (symbolP, (valueT) temp);
900 S_SET_EXTERNAL (symbolP);
905 if ( (!temp) || !flag_one)
906 S_GET_OTHER(symbolP) = const_flag;
908 #endif /* not OBJ_VMS */
909 know (symbolP->sy_frag == &zero_address_frag);
910 demand_empty_rest_of_line ();
920 temp = get_absolute_expression ();
921 if (flag_readonly_data_in_text)
923 section = text_section;
927 section = data_section;
929 subseg_set (section, (subsegT) temp);
934 demand_empty_rest_of_line ();
937 /* Handle the .appfile pseudo-op. This is automatically generated by
938 do_scrub_next_char when a preprocessor # line comment is seen with
939 a file name. This default definition may be overridden by the
940 object or CPU specific pseudo-ops. This function is also the
941 default definition for .file; the APPFILE argument is 1 for
942 .appfile, 0 for .file. */
951 /* Some assemblers tolerate immediately following '"' */
952 if ((s = demand_copy_string (&length)) != 0)
954 /* If this is a fake .appfile, a fake newline was inserted into
955 the buffer. Passing -2 to new_logical_line tells it to
957 new_logical_line (s, appfile ? -2 : -1);
958 demand_empty_rest_of_line ();
961 listing_source_file (s);
965 c_dot_file_symbol (s);
966 #endif /* OBJ_COFF */
972 /* Handle the .appline pseudo-op. This is automatically generated by
973 do_scrub_next_char when a preprocessor # line comment is seen.
974 This default definition may be overridden by the object or CPU
975 specific pseudo-ops. */
983 /* The given number is that of the next line. */
984 l = get_absolute_expression () - 1;
985 new_logical_line ((char *) NULL, l);
988 listing_source_line (l);
990 demand_empty_rest_of_line ();
997 long temp_repeat = 0;
999 register long temp_fill = 0;
1003 temp_repeat = get_absolute_expression ();
1004 if (*input_line_pointer == ',')
1006 input_line_pointer++;
1007 temp_size = get_absolute_expression ();
1008 if (*input_line_pointer == ',')
1010 input_line_pointer++;
1011 temp_fill = get_absolute_expression ();
1014 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
1015 #define BSD_FILL_SIZE_CROCK_8 (8)
1016 if (temp_size > BSD_FILL_SIZE_CROCK_8)
1018 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
1019 temp_size = BSD_FILL_SIZE_CROCK_8;
1023 as_warn ("Size negative: .fill ignored.");
1026 else if (temp_repeat <= 0)
1028 as_warn ("Repeat < 0, .fill ignored");
1032 if (temp_size && !need_pass_2)
1034 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
1035 memset (p, 0, (unsigned int) temp_size);
1036 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
1037 * flavoured AS. The following bizzare behaviour is to be
1038 * compatible with above. I guess they tried to take up to 8
1039 * bytes from a 4-byte expression and they forgot to sign
1040 * extend. Un*x Sux. */
1041 #define BSD_FILL_SIZE_CROCK_4 (4)
1042 md_number_to_chars (p, (valueT) temp_fill,
1043 (temp_size > BSD_FILL_SIZE_CROCK_4
1044 ? BSD_FILL_SIZE_CROCK_4
1045 : (int) temp_size));
1046 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
1047 * but emits no error message because it seems a legal thing to do.
1048 * It is a degenerate case of .fill but could be emitted by a compiler.
1051 demand_empty_rest_of_line ();
1064 name = input_line_pointer;
1065 c = get_symbol_end ();
1066 symbolP = symbol_find_or_make (name);
1067 *input_line_pointer = c;
1069 S_SET_EXTERNAL (symbolP);
1072 input_line_pointer++;
1074 if (*input_line_pointer == '\n')
1079 demand_empty_rest_of_line ();
1083 s_lcomm (needs_align)
1084 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1085 (alignment); 0 if it was an ".lcomm" (2 args only) */
1088 register char *name;
1092 register symbolS *symbolP;
1093 segT current_seg = now_seg;
1094 subsegT current_subseg = now_subseg;
1095 const int max_alignment = 15;
1097 segT bss_seg = bss_section;
1099 name = input_line_pointer;
1100 c = get_symbol_end ();
1101 p = input_line_pointer;
1105 /* Accept an optional comma after the name. The comma used to be
1106 required, but Irix 5 cc does not generate it. */
1107 if (*input_line_pointer == ',')
1109 ++input_line_pointer;
1113 if (*input_line_pointer == '\n')
1115 as_bad ("Missing size expression");
1119 if ((temp = get_absolute_expression ()) < 0)
1121 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1122 ignore_rest_of_line ();
1126 #if defined (TC_MIPS) || defined (TC_ALPHA)
1127 #if defined (OBJ_ECOFF) || defined (OBJ_ELF)
1128 /* For MIPS and Alpha ECOFF or ELF, small objects are put in .sbss. */
1129 if (temp <= bfd_get_gp_size (stdoutput))
1131 bss_seg = subseg_new (".sbss", 1);
1132 seg_info (bss_seg)->bss = 1;
1138 /* FIXME. This needs to be machine independent. */
1148 record_alignment(bss_seg, align);
1155 if (*input_line_pointer != ',')
1157 as_bad ("Expected comma after size");
1158 ignore_rest_of_line ();
1161 input_line_pointer++;
1163 if (*input_line_pointer == '\n')
1165 as_bad ("Missing alignment");
1168 align = get_absolute_expression ();
1169 if (align > max_alignment)
1171 align = max_alignment;
1172 as_warn ("Alignment too large: %d. assumed.", align);
1177 as_warn ("Alignment negative. 0 assumed.");
1179 record_alignment (bss_seg, align);
1180 } /* if needs align */
1183 /* Assume some objects may require alignment on some systems. */
1187 align = ffs (temp) - 1;
1188 if (temp % (1 << align))
1195 symbolP = symbol_find_or_make (name);
1199 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1200 S_GET_OTHER (symbolP) == 0 &&
1201 S_GET_DESC (symbolP) == 0 &&
1202 #endif /* OBJ_AOUT or OBJ_BOUT */
1203 (S_GET_SEGMENT (symbolP) == bss_seg
1204 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1208 subseg_set (bss_seg, 1);
1211 frag_align (align, 0);
1212 /* detach from old frag */
1213 if (S_GET_SEGMENT (symbolP) == bss_seg)
1214 symbolP->sy_frag->fr_symbol = NULL;
1216 symbolP->sy_frag = frag_now;
1217 pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1221 S_SET_SEGMENT (symbolP, bss_seg);
1224 /* The symbol may already have been created with a preceding
1225 ".globl" directive -- be careful not to step on storage class
1226 in that case. Otherwise, set it to static. */
1227 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1229 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1231 #endif /* OBJ_COFF */
1234 as_bad ("Ignoring attempt to re-define symbol `%s'.",
1235 S_GET_NAME (symbolP));
1237 subseg_set (current_seg, current_subseg);
1239 demand_empty_rest_of_line ();
1246 register char *name;
1250 register symbolS *symbolP;
1252 /* we permit ANY defined expression: BSD4.2 demands constants */
1253 name = input_line_pointer;
1254 c = get_symbol_end ();
1255 p = input_line_pointer;
1258 if (*input_line_pointer != ',')
1261 as_bad ("Expected comma after name \"%s\"", name);
1263 ignore_rest_of_line ();
1266 input_line_pointer++;
1268 if (exp.X_op != O_constant
1269 && exp.X_op != O_register)
1271 as_bad ("bad expression");
1272 ignore_rest_of_line ();
1276 symbolP = symbol_find_or_make (name);
1278 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1279 symbolP->sy_desc == 0) out of this test because coff doesn't have
1280 those fields, and I can't see when they'd ever be tripped. I
1281 don't think I understand why they were here so I may have
1282 introduced a bug. As recently as 1.37 didn't have this test
1283 anyway. xoxorich. */
1285 if (S_GET_SEGMENT (symbolP) == undefined_section
1286 && S_GET_VALUE (symbolP) == 0)
1288 /* The name might be an undefined .global symbol; be sure to
1289 keep the "external" bit. */
1290 S_SET_SEGMENT (symbolP,
1291 (exp.X_op == O_constant
1294 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1298 as_bad ("Symbol %s already defined", name);
1301 demand_empty_rest_of_line ();
1308 register segT segment;
1310 register long temp_fill;
1312 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1313 thing as a sub-segment-relative origin. Any absolute origin is
1314 given a warning, then assumed to be segment-relative. Any
1315 segmented origin expression ("foo+42") had better be in the right
1316 segment or the .org is ignored.
1318 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1319 we never know sub-segment sizes when we are reading code. BSD
1320 will crash trying to emit negative numbers of filler bytes in
1321 certain .orgs. We don't crash, but see as-write for that code.
1323 Don't make frag if need_pass_2==1. */
1324 segment = get_known_segmented_expression (&exp);
1325 if (*input_line_pointer == ',')
1327 input_line_pointer++;
1328 temp_fill = get_absolute_expression ();
1334 if (segment != now_seg && segment != absolute_section)
1335 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1336 segment_name (segment), segment_name (now_seg));
1337 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1338 exp.X_add_number, (char *) 0);
1340 } /* if (ok to make frag) */
1341 demand_empty_rest_of_line ();
1348 register char *name;
1349 register char delim;
1350 register char *end_name;
1351 register symbolS *symbolP;
1354 * Especial apologies for the random logic:
1355 * this just grew, and could be parsed much more simply!
1358 name = input_line_pointer;
1359 delim = get_symbol_end ();
1360 end_name = input_line_pointer;
1364 if (*input_line_pointer != ',')
1367 as_bad ("Expected comma after name \"%s\"", name);
1369 ignore_rest_of_line ();
1373 input_line_pointer++;
1376 if (name[0] == '.' && name[1] == '\0')
1378 /* Turn '. = mumble' into a .org mumble */
1379 register segT segment;
1383 segment = get_known_segmented_expression (&exp);
1387 if (segment != now_seg && segment != absolute_section)
1388 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1389 segment_name (segment),
1390 segment_name (now_seg));
1391 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1392 exp.X_add_number, (char *) 0);
1394 } /* if (ok to make frag) */
1400 if ((symbolP = symbol_find (name)) == NULL
1401 && (symbolP = md_undefined_symbol (name)) == NULL)
1403 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1405 /* "set" symbols are local unless otherwise specified. */
1406 SF_SET_LOCAL (symbolP);
1407 #endif /* OBJ_COFF */
1409 } /* make a new symbol */
1411 symbol_table_insert (symbolP);
1414 pseudo_set (symbolP);
1415 demand_empty_rest_of_line ();
1423 register long temp_fill;
1426 /* Just like .fill, but temp_size = 1 */
1427 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1429 temp_fill = get_absolute_expression ();
1433 input_line_pointer--; /* Backup over what was not a ','. */
1438 temp_repeat *= mult;
1440 if (temp_repeat <= 0)
1442 as_warn ("Repeat < 0, .space ignored");
1443 ignore_rest_of_line ();
1448 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1449 temp_repeat, (char *) 0);
1452 demand_empty_rest_of_line ();
1461 temp = get_absolute_expression ();
1462 subseg_set (text_section, (subsegT) temp);
1463 demand_empty_rest_of_line ();
1468 demand_empty_rest_of_line ()
1471 if (is_end_of_line[(unsigned char) *input_line_pointer])
1473 input_line_pointer++;
1477 ignore_rest_of_line ();
1479 /* Return having already swallowed end-of-line. */
1480 } /* Return pointing just after end-of-line. */
1483 ignore_rest_of_line () /* For suspect lines: gives warning. */
1485 if (!is_end_of_line[(unsigned char) *input_line_pointer])
1487 if (isprint (*input_line_pointer))
1488 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1489 *input_line_pointer);
1491 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1492 *input_line_pointer);
1493 while (input_line_pointer < buffer_limit
1494 && !is_end_of_line[(unsigned char) *input_line_pointer])
1496 input_line_pointer++;
1499 input_line_pointer++; /* Return pointing just after end-of-line. */
1500 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
1506 * In: Pointer to a symbol.
1507 * Input_line_pointer->expression.
1509 * Out: Input_line_pointer->just after any whitespace after expression.
1510 * Tried to set symbol to value of expression.
1511 * Will change symbols type, value, and frag;
1514 pseudo_set (symbolP)
1518 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
1520 #endif /* OBJ_AOUT or OBJ_BOUT */
1522 know (symbolP); /* NULL pointer is logic error. */
1523 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
1524 ext = S_IS_EXTERNAL (symbolP);
1525 #endif /* OBJ_AOUT or OBJ_BOUT */
1527 (void) expression (&exp);
1529 if (exp.X_op == O_illegal)
1530 as_bad ("illegal expression; zero assumed");
1531 else if (exp.X_op == O_absent)
1532 as_bad ("missing expression; zero assumed");
1533 else if (exp.X_op == O_big)
1534 as_bad ("%s number invalid; zero assumed",
1535 exp.X_add_number > 0 ? "bignum" : "floating point");
1536 else if (exp.X_op == O_subtract
1537 && (S_GET_SEGMENT (exp.X_add_symbol)
1538 == S_GET_SEGMENT (exp.X_op_symbol))
1539 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
1540 && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
1542 exp.X_op = O_constant;
1543 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
1544 - S_GET_VALUE (exp.X_op_symbol));
1552 exp.X_add_number = 0;
1555 S_SET_SEGMENT (symbolP, absolute_section);
1556 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
1558 S_SET_EXTERNAL (symbolP);
1560 S_CLEAR_EXTERNAL (symbolP);
1561 #endif /* OBJ_AOUT or OBJ_BOUT */
1562 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1563 symbolP->sy_frag = &zero_address_frag;
1567 S_SET_SEGMENT (symbolP, reg_section);
1568 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1569 symbolP->sy_frag = &zero_address_frag;
1573 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section)
1574 symbolP->sy_value = exp;
1577 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (exp.X_add_symbol));
1578 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
1580 S_SET_EXTERNAL (symbolP);
1582 S_CLEAR_EXTERNAL (symbolP);
1583 #endif /* OBJ_AOUT or OBJ_BOUT */
1584 S_SET_VALUE (symbolP,
1585 exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1586 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1591 /* The value is some complex expression.
1592 FIXME: Should we set the segment to anything? */
1593 symbolP->sy_value = exp;
1601 * CONStruct more frag of .bytes, or .words etc.
1602 * Should need_pass_2 be 1 then emit no frag(s).
1603 * This understands EXPRESSIONS.
1607 * This has a split personality. We use expression() to read the
1608 * value. We can detect if the value won't fit in a byte or word.
1609 * But we can't detect if expression() discarded significant digits
1610 * in the case of a long. Not worth the crocks required to fix it.
1613 /* Select a parser for cons expressions. */
1615 /* Some targets need to parse the expression in various fancy ways.
1616 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1617 (for example, the HPPA does this). Otherwise, you can define
1618 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1619 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1620 are defined, which is the normal case, then only simple expressions
1623 #ifndef TC_PARSE_CONS_EXPRESSION
1624 #ifdef BITFIELD_CONS_EXPRESSIONS
1625 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1627 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1630 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1632 parse_mri_cons PARAMS ((expressionS *exp));
1634 #ifdef REPEAT_CONS_EXPRESSIONS
1635 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1637 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1640 /* If we haven't gotten one yet, just call expression. */
1641 #ifndef TC_PARSE_CONS_EXPRESSION
1642 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1646 /* worker to do .byte etc statements */
1647 /* clobbers input_line_pointer, checks */
1651 register int nbytes; /* 1=.byte, 2=.word, 4=.long */
1655 if (is_it_end_of_statement ())
1657 demand_empty_rest_of_line ();
1663 TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
1664 emit_expr (&exp, (unsigned int) nbytes);
1666 while (*input_line_pointer++ == ',');
1668 input_line_pointer--; /* Put terminator back into stream. */
1669 demand_empty_rest_of_line ();
1672 /* Put the contents of expression EXP into the object file using
1673 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1676 emit_expr (exp, nbytes)
1678 unsigned int nbytes;
1682 valueT extra_digit = 0;
1684 /* Don't do anything if we are going to make another pass. */
1690 /* Handle a negative bignum. */
1692 && exp->X_add_number == 0
1693 && exp->X_add_symbol->sy_value.X_op == O_big
1694 && exp->X_add_symbol->sy_value.X_add_number > 0)
1697 unsigned long carry;
1699 exp = &exp->X_add_symbol->sy_value;
1701 /* Negate the bignum: one's complement each digit and add 1. */
1703 for (i = 0; i < exp->X_add_number; i++)
1707 next = (((~ (generic_bignum[i] & LITTLENUM_MASK))
1710 generic_bignum[i] = next & LITTLENUM_MASK;
1711 carry = next >> LITTLENUM_NUMBER_OF_BITS;
1714 /* We can ignore any carry out, because it will be handled by
1715 extra_digit if it is needed. */
1717 extra_digit = (valueT) -1;
1721 if (op == O_absent || op == O_illegal)
1723 as_warn ("zero assumed for missing expression");
1724 exp->X_add_number = 0;
1727 else if (op == O_big && exp->X_add_number <= 0)
1729 as_bad ("floating point number invalid; zero assumed");
1730 exp->X_add_number = 0;
1733 else if (op == O_register)
1735 as_warn ("register value used as expression");
1739 p = frag_more ((int) nbytes);
1741 #ifndef WORKING_DOT_WORD
1742 /* If we have the difference of two symbols in a word, save it on
1743 the broken_words list. See the code in write.c. */
1744 if (op == O_subtract && nbytes == 2)
1746 struct broken_word *x;
1748 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1749 x->next_broken_word = broken_words;
1752 x->word_goes_here = p;
1754 x->add = exp->X_add_symbol;
1755 x->sub = exp->X_op_symbol;
1756 x->addnum = exp->X_add_number;
1763 /* If we have an integer, but the number of bytes is too large to
1764 pass to md_number_to_chars, handle it as a bignum. */
1765 if (op == O_constant && nbytes > sizeof (valueT))
1770 if (! exp->X_unsigned && exp->X_add_number < 0)
1771 extra_digit = (valueT) -1;
1772 val = (valueT) exp->X_add_number;
1776 generic_bignum[gencnt] = val & LITTLENUM_MASK;
1777 val >>= LITTLENUM_NUMBER_OF_BITS;
1781 op = exp->X_op = O_big;
1782 exp->X_add_number = gencnt;
1785 if (op == O_constant)
1787 register valueT get;
1788 register valueT use;
1789 register valueT mask;
1790 register valueT unmask;
1792 /* JF << of >= number of bits in the object is undefined. In
1793 particular SPARC (Sun 4) has problems */
1794 if (nbytes >= sizeof (valueT))
1797 mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1799 unmask = ~mask; /* Do store these bits. */
1802 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1803 mask = ~(unmask >> 1); /* Includes sign bit now. */
1806 get = exp->X_add_number;
1808 if ((get & mask) != 0 && (get & mask) != mask)
1809 { /* Leading bits contain both 0s & 1s. */
1810 as_warn ("Value 0x%lx truncated to 0x%lx.", get, use);
1812 /* put bytes in right order. */
1813 md_number_to_chars (p, use, (int) nbytes);
1815 else if (op == O_big)
1818 LITTLENUM_TYPE *nums;
1820 know (nbytes % CHARS_PER_LITTLENUM == 0);
1822 size = exp->X_add_number * CHARS_PER_LITTLENUM;
1825 as_warn ("Bignum truncated to %d bytes", nbytes);
1829 if (target_big_endian)
1831 while (nbytes > size)
1833 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1834 nbytes -= CHARS_PER_LITTLENUM;
1835 p += CHARS_PER_LITTLENUM;
1838 nums = generic_bignum + size / CHARS_PER_LITTLENUM;
1842 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1843 size -= CHARS_PER_LITTLENUM;
1844 p += CHARS_PER_LITTLENUM;
1849 nums = generic_bignum;
1852 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1854 size -= CHARS_PER_LITTLENUM;
1855 p += CHARS_PER_LITTLENUM;
1856 nbytes -= CHARS_PER_LITTLENUM;
1861 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1862 nbytes -= CHARS_PER_LITTLENUM;
1863 p += CHARS_PER_LITTLENUM;
1869 memset (p, 0, nbytes);
1871 /* Now we need to generate a fixS to record the symbol value.
1872 This is easy for BFD. For other targets it can be more
1873 complex. For very complex cases (currently, the HPPA and
1874 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1875 want. For simpler cases, you can define TC_CONS_RELOC to be
1876 the name of the reloc code that should be stored in the fixS.
1877 If neither is defined, the code uses NO_RELOC if it is
1878 defined, and otherwise uses 0. */
1880 #ifdef BFD_ASSEMBLER
1881 #ifdef TC_CONS_FIX_NEW
1882 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1884 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1885 /* @@ Should look at CPU word size. */
1886 nbytes == 2 ? BFD_RELOC_16
1887 : nbytes == 8 ? BFD_RELOC_64
1891 #ifdef TC_CONS_FIX_NEW
1892 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1894 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1895 it is defined, otherwise use NO_RELOC if it is defined,
1897 #ifndef TC_CONS_RELOC
1899 #define TC_CONS_RELOC NO_RELOC
1901 #define TC_CONS_RELOC 0
1904 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1906 #endif /* TC_CONS_FIX_NEW */
1907 #endif /* BFD_ASSEMBLER */
1911 #ifdef BITFIELD_CONS_EXPRESSIONS
1913 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1914 w:x,y:z, where w and y are bitwidths and x and y are values. They
1915 then pack them all together. We do a little better in that we allow
1916 them in words, longs, etc. and we'll pack them in target byte order
1919 The rules are: pack least significat bit first, if a field doesn't
1920 entirely fit, put it in the next unit. Overflowing the bitfield is
1921 explicitly *not* even a warning. The bitwidth should be considered
1924 To use this function the tc-XXX.h file should define
1925 BITFIELD_CONS_EXPRESSIONS. */
1928 parse_bitfield_cons (exp, nbytes)
1930 unsigned int nbytes;
1932 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1933 char *hold = input_line_pointer;
1935 (void) expression (exp);
1937 if (*input_line_pointer == ':')
1943 unsigned long width;
1945 if (*input_line_pointer != ':')
1947 input_line_pointer = hold;
1949 } /* next piece is not a bitfield */
1951 /* In the general case, we can't allow
1952 full expressions with symbol
1953 differences and such. The relocation
1954 entries for symbols not defined in this
1955 assembly would require arbitrary field
1956 widths, positions, and masks which most
1957 of our current object formats don't
1960 In the specific case where a symbol
1961 *is* defined in this assembly, we
1962 *could* build fixups and track it, but
1963 this could lead to confusion for the
1964 backends. I'm lazy. I'll take any
1965 SEG_ABSOLUTE. I think that means that
1966 you can use a previous .set or
1967 .equ type symbol. xoxorich. */
1969 if (exp->X_op == O_absent)
1971 as_warn ("using a bit field width of zero");
1972 exp->X_add_number = 0;
1973 exp->X_op = O_constant;
1974 } /* implied zero width bitfield */
1976 if (exp->X_op != O_constant)
1978 *input_line_pointer = '\0';
1979 as_bad ("field width \"%s\" too complex for a bitfield", hold);
1980 *input_line_pointer = ':';
1981 demand_empty_rest_of_line ();
1985 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1987 as_warn ("field width %lu too big to fit in %d bytes: truncated to %d bits",
1988 width, nbytes, (BITS_PER_CHAR * nbytes));
1989 width = BITS_PER_CHAR * nbytes;
1992 if (width > bits_available)
1994 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1995 input_line_pointer = hold;
1996 exp->X_add_number = value;
2000 hold = ++input_line_pointer; /* skip ':' */
2002 (void) expression (exp);
2003 if (exp->X_op != O_constant)
2005 char cache = *input_line_pointer;
2007 *input_line_pointer = '\0';
2008 as_bad ("field value \"%s\" too complex for a bitfield", hold);
2009 *input_line_pointer = cache;
2010 demand_empty_rest_of_line ();
2014 value |= ((~(-1 << width) & exp->X_add_number)
2015 << ((BITS_PER_CHAR * nbytes) - bits_available));
2017 if ((bits_available -= width) == 0
2018 || is_it_end_of_statement ()
2019 || *input_line_pointer != ',')
2022 } /* all the bitfields we're gonna get */
2024 hold = ++input_line_pointer;
2025 (void) expression (exp);
2026 } /* forever loop */
2028 exp->X_add_number = value;
2029 exp->X_op = O_constant;
2030 exp->X_unsigned = 1;
2031 } /* if looks like a bitfield */
2032 } /* parse_bitfield_cons() */
2034 #endif /* BITFIELD_CONS_EXPRESSIONS */
2039 parse_mri_cons (exp, nbytes)
2041 unsigned int nbytes;
2043 if (*input_line_pointer == '\'')
2045 /* An MRI style string, cut into as many bytes as will fit into
2046 a nbyte chunk, left justify if necessary, and separate with
2047 commas so we can try again later */
2049 unsigned int result = 0;
2050 input_line_pointer++;
2051 for (scan = 0; scan < nbytes; scan++)
2053 if (*input_line_pointer == '\'')
2055 if (input_line_pointer[1] == '\'')
2057 input_line_pointer++;
2062 result = (result << 8) | (*input_line_pointer++);
2066 while (scan < nbytes)
2071 /* Create correct expression */
2072 exp->X_op = O_constant;
2073 exp->X_add_number = result;
2074 /* Fake it so that we can read the next char too */
2075 if (input_line_pointer[0] != '\'' ||
2076 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
2078 input_line_pointer -= 2;
2079 input_line_pointer[0] = ',';
2080 input_line_pointer[1] = '\'';
2083 input_line_pointer++;
2091 #ifdef REPEAT_CONS_EXPRESSIONS
2093 /* Parse a repeat expression for cons. This is used by the MIPS
2094 assembler. The format is NUMBER:COUNT; NUMBER appears in the
2095 object file COUNT times.
2097 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
2100 parse_repeat_cons (exp, nbytes)
2102 unsigned int nbytes;
2109 if (*input_line_pointer != ':')
2111 /* No repeat count. */
2115 ++input_line_pointer;
2116 expression (&count);
2117 if (count.X_op != O_constant
2118 || count.X_add_number <= 0)
2120 as_warn ("Unresolvable or nonpositive repeat count; using 1");
2124 /* The cons function is going to output this expression once. So we
2125 output it count - 1 times. */
2126 for (i = count.X_add_number - 1; i > 0; i--)
2127 emit_expr (exp, nbytes);
2130 #endif /* REPEAT_CONS_EXPRESSIONS */
2135 * CONStruct some more frag chars of .floats .ffloats etc.
2136 * Makes 0 or more new frags.
2137 * If need_pass_2 == 1, no frags are emitted.
2138 * This understands only floating literals, not expressions. Sorry.
2140 * A floating constant is defined by atof_generic(), except it is preceded
2141 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2142 * reading, I decided to be incompatible. This always tries to give you
2143 * rounded bits to the precision of the pseudo-op. Former AS did premature
2144 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2145 * a choice of 2 flavours of noise according to which of 2 floating-point
2146 * scanners you directed AS to use.
2148 * In: input_line_pointer->whitespace before, or '0' of flonum.
2153 float_cons (float_type)
2154 /* Clobbers input_line-pointer, checks end-of-line. */
2155 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2158 int length; /* Number of chars in an object. */
2159 register char *err; /* Error from scanning floating literal. */
2160 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2162 if (is_it_end_of_statement ())
2164 demand_empty_rest_of_line ();
2170 /* input_line_pointer->1st char of a flonum (we hope!). */
2173 /* Skip any 0{letter} that may be present. Don't even check if the
2174 * letter is legal. Someone may invent a "z" format and this routine
2175 * has no use for such information. Lusers beware: you get
2176 * diagnostics if your input is ill-conditioned.
2178 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2179 input_line_pointer += 2;
2181 err = md_atof (float_type, temp, &length);
2182 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2186 as_bad ("Bad floating literal: %s", err);
2187 ignore_rest_of_line ();
2197 #ifdef REPEAT_CONS_EXPRESSIONS
2198 if (*input_line_pointer == ':')
2200 expressionS count_exp;
2202 ++input_line_pointer;
2203 expression (&count_exp);
2204 if (count_exp.X_op != O_constant
2205 || count_exp.X_add_number <= 0)
2207 as_warn ("unresolvable or nonpositive repeat count; using 1");
2210 count = count_exp.X_add_number;
2214 while (--count >= 0)
2216 p = frag_more (length);
2217 memcpy (p, temp, (unsigned int) length);
2222 while (*input_line_pointer++ == ',');
2224 --input_line_pointer; /* Put terminator back into stream. */
2225 demand_empty_rest_of_line ();
2226 } /* float_cons() */
2231 * We read 0 or more ',' seperated, double-quoted strings.
2233 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2238 stringer (append_zero) /* Worker to do .ascii etc statements. */
2239 /* Checks end-of-line. */
2240 register int append_zero; /* 0: don't append '\0', else 1 */
2242 register unsigned int c;
2245 * The following awkward logic is to parse ZERO or more strings,
2246 * comma seperated. Recall a string expression includes spaces
2247 * before the opening '\"' and spaces after the closing '\"'.
2248 * We fake a leading ',' if there is (supposed to be)
2249 * a 1st, expression. We keep demanding expressions for each
2252 if (is_it_end_of_statement ())
2254 c = 0; /* Skip loop. */
2255 ++input_line_pointer; /* Compensate for end of loop. */
2259 c = ','; /* Do loop. */
2261 while (c == ',' || c == '<' || c == '"')
2264 switch (*input_line_pointer)
2267 ++input_line_pointer; /*->1st char of string. */
2268 while (is_a_char (c = next_char_of_string ()))
2270 FRAG_APPEND_1_CHAR (c);
2274 FRAG_APPEND_1_CHAR (0);
2276 know (input_line_pointer[-1] == '\"');
2279 input_line_pointer++;
2280 c = get_single_number ();
2281 FRAG_APPEND_1_CHAR (c);
2282 if (*input_line_pointer != '>')
2284 as_bad ("Expected <nn>");
2286 input_line_pointer++;
2289 input_line_pointer++;
2293 c = *input_line_pointer;
2296 demand_empty_rest_of_line ();
2299 /* FIXME-SOMEDAY: I had trouble here on characters with the
2300 high bits set. We'll probably also have trouble with
2301 multibyte chars, wide chars, etc. Also be careful about
2302 returning values bigger than 1 byte. xoxorich. */
2305 next_char_of_string ()
2307 register unsigned int c;
2309 c = *input_line_pointer++ & CHAR_MASK;
2316 #ifndef NO_STRING_ESCAPES
2318 switch (c = *input_line_pointer++)
2348 break; /* As itself. */
2364 for (i = 0, number = 0; isdigit (c) && i < 3; c = *input_line_pointer++, i++)
2366 number = number * 8 + c - '0';
2370 --input_line_pointer;
2379 c = *input_line_pointer++;
2380 while (isxdigit (c))
2383 number = number * 16 + c - '0';
2384 else if (isupper (c))
2385 number = number * 16 + c - 'A' + 10;
2387 number = number * 16 + c - 'a' + 10;
2388 c = *input_line_pointer++;
2391 --input_line_pointer;
2396 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2397 as_warn ("Unterminated string: Newline inserted.");
2403 #ifdef ONLY_STANDARD_ESCAPES
2404 as_bad ("Bad escaped character in string, '?' assumed");
2406 #endif /* ONLY_STANDARD_ESCAPES */
2409 } /* switch on escaped char */
2411 #endif /* ! defined (NO_STRING_ESCAPES) */
2415 } /* switch on char */
2417 } /* next_char_of_string() */
2420 get_segmented_expression (expP)
2421 register expressionS *expP;
2423 register segT retval;
2425 retval = expression (expP);
2426 if (expP->X_op == O_illegal
2427 || expP->X_op == O_absent
2428 || expP->X_op == O_big)
2430 as_bad ("expected address expression; zero assumed");
2431 expP->X_op = O_constant;
2432 expP->X_add_number = 0;
2433 retval = absolute_section;
2439 get_known_segmented_expression (expP)
2440 register expressionS *expP;
2442 register segT retval;
2444 if ((retval = get_segmented_expression (expP)) == undefined_section)
2446 /* There is no easy way to extract the undefined symbol from the
2448 if (expP->X_add_symbol != NULL
2449 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
2450 as_warn ("symbol \"%s\" undefined; zero assumed",
2451 S_GET_NAME (expP->X_add_symbol));
2453 as_warn ("some symbol undefined; zero assumed");
2454 retval = absolute_section;
2455 expP->X_op = O_constant;
2456 expP->X_add_number = 0;
2458 know (retval == absolute_section || SEG_NORMAL (retval));
2460 } /* get_known_segmented_expression() */
2463 get_absolute_expression ()
2468 if (exp.X_op != O_constant)
2470 if (exp.X_op != O_absent)
2471 as_bad ("bad absolute expression; zero assumed");
2472 exp.X_add_number = 0;
2474 return exp.X_add_number;
2477 char /* return terminator */
2478 get_absolute_expression_and_terminator (val_pointer)
2479 long *val_pointer; /* return value of expression */
2481 /* FIXME: val_pointer should probably be offsetT *. */
2482 *val_pointer = (long) get_absolute_expression ();
2483 return (*input_line_pointer++);
2487 * demand_copy_C_string()
2489 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2490 * Give a warning if that happens.
2493 demand_copy_C_string (len_pointer)
2498 if ((s = demand_copy_string (len_pointer)) != 0)
2502 for (len = *len_pointer;
2511 as_bad ("This string may not contain \'\\0\'");
2519 * demand_copy_string()
2521 * Demand string, but return a safe (=private) copy of the string.
2522 * Return NULL if we can't read a string here.
2525 demand_copy_string (lenP)
2528 register unsigned int c;
2534 if (*input_line_pointer == '\"')
2536 input_line_pointer++; /* Skip opening quote. */
2538 while (is_a_char (c = next_char_of_string ()))
2540 obstack_1grow (¬es, c);
2543 /* JF this next line is so demand_copy_C_string will return a null
2544 termanated string. */
2545 obstack_1grow (¬es, '\0');
2546 retval = obstack_finish (¬es);
2550 as_warn ("Missing string");
2552 ignore_rest_of_line ();
2556 } /* demand_copy_string() */
2559 * is_it_end_of_statement()
2561 * In: Input_line_pointer->next character.
2563 * Do: Skip input_line_pointer over all whitespace.
2565 * Out: 1 if input_line_pointer->end-of-line.
2568 is_it_end_of_statement ()
2571 return (is_end_of_line[(unsigned char) *input_line_pointer]);
2572 } /* is_it_end_of_statement() */
2578 register symbolS *symbolP; /* symbol we are working with */
2580 input_line_pointer++;
2581 if (*input_line_pointer == '=')
2582 input_line_pointer++;
2584 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2585 input_line_pointer++;
2587 if (sym_name[0] == '.' && sym_name[1] == '\0')
2589 /* Turn '. = mumble' into a .org mumble */
2590 register segT segment;
2594 segment = get_known_segmented_expression (&exp);
2597 if (segment != now_seg && segment != absolute_section)
2598 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2599 segment_name (segment),
2600 segment_name (now_seg));
2601 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2602 exp.X_add_number, (char *) 0);
2604 } /* if (ok to make frag) */
2608 symbolP = symbol_find_or_make (sym_name);
2609 pseudo_set (symbolP);
2613 /* .include -- include a file at this point. */
2626 filename = demand_copy_string (&i);
2627 demand_empty_rest_of_line ();
2628 path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
2629 for (i = 0; i < include_dir_count; i++)
2631 strcpy (path, include_dirs[i]);
2633 strcat (path, filename);
2634 if (0 != (try = fopen (path, FOPEN_RT)))
2643 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2644 newbuf = input_scrub_include_file (path, input_line_pointer);
2645 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2649 add_include_dir (path)
2654 if (include_dir_count == 0)
2656 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2657 include_dirs[0] = "."; /* Current dir */
2658 include_dir_count = 2;
2662 include_dir_count++;
2663 include_dirs = (char **) realloc (include_dirs,
2664 include_dir_count * sizeof (*include_dirs));
2667 include_dirs[include_dir_count - 1] = path; /* New one */
2670 if (i > include_dir_maxlen)
2671 include_dir_maxlen = i;
2672 } /* add_include_dir() */
2678 while (!is_end_of_line[(unsigned char) *input_line_pointer])
2680 ++input_line_pointer;
2682 ++input_line_pointer;