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_lineno = 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 #ifdef TARGET_BYTES_BIG_ENDIAN
145 /* Hack to deal with tc-*.h defining TARGET_BYTES_BIG_ENDIAN to empty
146 instead of to 0 or 1. */
147 #if 5 - TARGET_BYTES_BIG_ENDIAN - 5 == 10
148 #undef TARGET_BYTES_BIG_ENDIAN
149 #define TARGET_BYTES_BIG_ENDIAN 1
151 int target_big_endian = TARGET_BYTES_BIG_ENDIAN;
153 int target_big_endian /* = 0 */;
156 static char *old_buffer; /* JF a hack */
157 static char *old_input;
158 static char *old_limit;
160 /* Variables for handling include file directory list. */
162 char **include_dirs; /* List of pointers to directories to
163 search for .include's */
164 int include_dir_count; /* How many are in the list */
165 int include_dir_maxlen = 1;/* Length of longest in list */
167 #ifndef WORKING_DOT_WORD
168 struct broken_word *broken_words;
169 int new_broken_words;
172 char *demand_copy_string PARAMS ((int *lenP));
173 int is_it_end_of_statement PARAMS ((void));
174 static segT get_segmented_expression PARAMS ((expressionS *expP));
175 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
176 static void pobegin PARAMS ((void));
185 obj_read_begin_hook ();
187 /* Something close -- but not too close -- to a multiple of 1024.
188 The debugging malloc I'm using has 24 bytes of overhead. */
189 obstack_begin (¬es, 5090);
190 obstack_begin (&cond_obstack, 990);
192 /* Use machine dependent syntax */
193 for (p = line_separator_chars; *p; p++)
194 is_end_of_line[(unsigned char) *p] = 1;
195 /* Use more. FIXME-SOMEDAY. */
198 /* set up pseudo-op tables */
200 struct hash_control *po_hash;
202 static const pseudo_typeS potable[] =
204 {"abort", s_abort, 0},
205 {"align", s_align_ptwo, 0},
206 {"ascii", stringer, 0},
207 {"asciz", stringer, 1},
208 {"balign", s_align_bytes, 0},
217 {"double", float_cons, 'd'},
219 {"eject", listing_eject, 0}, /* Formfeed listing */
222 {"endif", s_endif, 0},
227 {"extern", s_ignore, 0}, /* We treat all undef as ext */
228 {"appfile", s_app_file, 1},
229 {"appline", s_app_line, 0},
230 {"file", s_app_file, 0},
232 {"float", float_cons, 'f'},
233 {"global", s_globl, 0},
234 {"globl", s_globl, 0},
237 {"ifdef", s_ifdef, 0},
238 {"ifeqs", s_ifeqs, 0},
239 {"ifndef", s_ifdef, 1},
240 {"ifnes", s_ifeqs, 1},
241 {"ifnotdef", s_ifdef, 1},
242 {"include", s_include, 0},
244 {"lcomm", s_lcomm, 0},
245 {"lflags", listing_flags, 0}, /* Listing flags */
246 {"list", listing_list, 1}, /* Turn listing on */
249 {"nolist", listing_list, 0}, /* Turn listing off */
252 {"p2align", s_align_ptwo, 0},
253 {"psize", listing_psize, 0}, /* set paper size */
256 {"sbttl", listing_title, 1}, /* Subtitle of listing */
261 {"single", float_cons, 'f'},
263 {"space", s_space, 0},
264 {"stabd", s_stab, 'd'},
265 {"stabn", s_stab, 'n'},
266 {"stabs", s_stab, 's'},
267 {"string", stringer, 1},
271 /* This is for gcc to use. It's only just been added (2/94), so gcc
272 won't be able to use it for a while -- probably a year or more.
273 But once this has been released, check with gcc maintainers
274 before deleting it or even changing the spelling. */
275 {"this_GCC_requires_the_GNU_assembler", s_ignore, 0},
276 /* If we're folding case -- done for some targets, not necessarily
277 all -- the above string in an input file will be converted to
278 this one. Match it either way... */
279 {"this_gcc_requires_the_gnu_assembler", s_ignore, 0},
281 {"title", listing_title, 0}, /* Listing title */
285 {"xstabs", s_xstab, 's'},
287 {"zero", s_space, 0},
288 {NULL} /* end sentinel */
291 static int pop_override_ok = 0;
292 static const char *pop_table_name;
296 const pseudo_typeS *table;
299 const pseudo_typeS *pop;
300 for (pop = table; pop->poc_name; pop++)
302 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
303 if (errtxt && (!pop_override_ok || strcmp (errtxt, "exists")))
304 as_fatal ("error constructing %s pseudo-op table", pop_table_name);
308 #ifndef md_pop_insert
309 #define md_pop_insert() pop_insert(md_pseudo_table)
312 #ifndef obj_pop_insert
313 #define obj_pop_insert() pop_insert(obj_pseudo_table)
319 po_hash = hash_new ();
321 /* Do the target-specific pseudo ops. */
322 pop_table_name = "md";
325 /* Now object specific. Skip any that were in the target table. */
326 pop_table_name = "obj";
330 /* Now portable ones. Skip any that we've seen already. */
331 pop_table_name = "standard";
332 pop_insert (potable);
335 #define HANDLE_CONDITIONAL_ASSEMBLY() \
336 if (ignore_input ()) \
338 while (! is_end_of_line[(unsigned char) *input_line_pointer++]) \
339 if (input_line_pointer == buffer_limit) \
345 /* read_a_source_file()
347 * We read the file, putting things into a web that
348 * represents what we have been reading.
351 read_a_source_file (name)
355 register char *s; /* string of symbol, '\0' appended */
359 buffer = input_scrub_new_file (name);
362 listing_newline ("");
364 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
365 { /* We have another line to parse. */
366 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
367 contin: /* JF this goto is my fault I admit it.
368 Someone brave please re-write the whole
369 input section here? Pleeze??? */
370 while (input_line_pointer < buffer_limit)
372 /* We have more of this buffer to parse. */
375 * We now have input_line_pointer->1st char of next line.
376 * If input_line_pointer [-1] == '\n' then we just
377 * scanned another line: so bump line counters.
379 if (is_end_of_line[(unsigned char) input_line_pointer[-1]])
381 if (input_line_pointer[-1] == '\n')
382 bump_line_counters ();
384 #if defined (MRI) || defined (LABELS_WITHOUT_COLONS)
385 /* Text at the start of a line must be a label, we run down
386 and stick a colon in. */
387 if (is_name_beginner (*input_line_pointer))
389 char *line_start = input_line_pointer;
390 char c = get_symbol_end ();
392 *input_line_pointer = c;
394 input_line_pointer++;
402 * We are at the begining of a line, or similar place.
403 * We expect a well-formed assembler statement.
404 * A "symbol-name:" is a statement.
406 * Depending on what compiler is used, the order of these tests
407 * may vary to catch most common case 1st.
408 * Each test is independent of all other tests at the (top) level.
409 * PLEASE make a compiler that doesn't use this assembler.
410 * It is crufty to waste a compiler's time encoding things for this
411 * assembler, which then wastes more time decoding it.
412 * (And communicating via (linear) files is silly!
413 * If you must pass stuff, please pass a tree!)
415 if ((c = *input_line_pointer++) == '\t'
420 c = *input_line_pointer++;
422 know (c != ' '); /* No further leading whitespace. */
425 * C is the 1st significant character.
426 * Input_line_pointer points after that character.
428 if (is_name_beginner (c))
430 /* want user-defined label or pseudo/opcode */
431 HANDLE_CONDITIONAL_ASSEMBLY ();
433 s = --input_line_pointer;
434 c = get_symbol_end (); /* name's delimiter */
436 * C is character after symbol.
437 * That character's place in the input line is now '\0'.
438 * S points to the beginning of the symbol.
439 * [In case of pseudo-op, s->'.'.]
440 * Input_line_pointer->'\0' where c was.
442 if (TC_START_LABEL(c, input_line_pointer))
444 colon (s); /* user-defined label */
445 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
446 /* Input_line_pointer->after ':'. */
452 || (input_line_pointer[1] == '='
453 #ifdef TC_EQUAL_IN_INSN
454 && ! TC_EQUAL_IN_INSN (c, input_line_pointer)
459 demand_empty_rest_of_line ();
462 { /* expect pseudo-op or machine instruction */
464 if (!done_pseudo (s))
470 #define IGNORE_OPCODE_CASE
471 #ifdef IGNORE_OPCODE_CASE
484 /* The m88k uses pseudo-ops without a period. */
485 pop = (pseudo_typeS *) hash_find (po_hash, s);
486 if (pop != NULL && pop->poc_handler == NULL)
490 if (pop != NULL || *s == '.')
495 * WARNING: c has next char, which may be end-of-line.
496 * We lookup the pseudo-op table with s+1 because we
497 * already know that the pseudo-op begins with a '.'.
501 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
503 /* Print the error msg now, while we still can */
506 as_bad ("Unknown pseudo-op: `%s'", s);
507 *input_line_pointer = c;
512 /* Put it back for error messages etc. */
513 *input_line_pointer = c;
514 /* The following skip of whitespace is compulsory.
515 A well shaped space is sometimes all that separates
516 keyword from operands. */
517 if (c == ' ' || c == '\t')
518 input_line_pointer++;
520 * Input_line is restored.
521 * Input_line_pointer->1st non-blank char
522 * after pseudo-operation.
524 (*pop->poc_handler) (pop->poc_val);
528 { /* machine instruction */
529 /* WARNING: c has char, which may be end-of-line. */
530 /* Also: input_line_pointer->`\0` where c was. */
531 *input_line_pointer = c;
532 while (!is_end_of_line[(unsigned char) *input_line_pointer]
533 #ifdef TC_EOL_IN_INSN
534 || TC_EOL_IN_INSN (input_line_pointer)
538 input_line_pointer++;
541 c = *input_line_pointer;
542 *input_line_pointer = '\0';
544 #ifdef OBJ_GENERATE_ASM_LINENO
545 if (generate_asm_lineno == 0)
547 if (ecoff_no_current_file ())
548 generate_asm_lineno = 1;
550 if (generate_asm_lineno == 1)
555 as_where (&s, &lineno);
556 OBJ_GENERATE_ASM_LINENO (s, lineno);
560 md_assemble (s); /* Assemble 1 instruction. */
562 *input_line_pointer++ = c;
564 /* We resume loop AFTER the end-of-line from
569 } /* if (is_name_beginner(c) */
572 /* Empty statement? */
573 if (is_end_of_line[(unsigned char) c])
576 if ((LOCAL_LABELS_DOLLAR || LOCAL_LABELS_FB)
579 /* local label ("4:") */
580 char *backup = input_line_pointer;
582 HANDLE_CONDITIONAL_ASSEMBLY ();
586 while (isdigit (*input_line_pointer))
588 temp = (temp * 10) + *input_line_pointer - '0';
589 ++input_line_pointer;
590 } /* read the whole number */
592 if (LOCAL_LABELS_DOLLAR
593 && *input_line_pointer == '$'
594 && *(input_line_pointer + 1) == ':')
596 input_line_pointer += 2;
598 if (dollar_label_defined (temp))
600 as_fatal ("label \"%d$\" redefined", temp);
603 define_dollar_label (temp);
604 colon (dollar_label_name (temp, 0));
609 && *input_line_pointer++ == ':')
611 fb_label_instance_inc (temp);
612 colon (fb_label_name (temp, 0));
616 input_line_pointer = backup;
617 } /* local label ("4:") */
619 if (c && strchr (line_comment_chars, c))
620 { /* Its a comment. Better say APP or NO_APP */
624 unsigned int new_length;
626 extern char *scrub_string, *scrub_last_string;
628 bump_line_counters ();
629 s = input_line_pointer;
630 if (strncmp (s, "APP\n", 4))
631 continue; /* We ignore it */
634 ends = strstr (s, "#NO_APP\n");
638 unsigned int tmp_len;
641 /* The end of the #APP wasn't in this buffer. We
642 keep reading in buffers until we find the #NO_APP
643 that goes with this #APP There is one. The specs
645 tmp_len = buffer_limit - s;
646 tmp_buf = xmalloc (tmp_len + 1);
647 memcpy (tmp_buf, s, tmp_len);
650 new_tmp = input_scrub_next_buffer (&buffer);
654 buffer_limit = new_tmp;
655 input_line_pointer = buffer;
656 ends = strstr (buffer, "#NO_APP\n");
660 num = buffer_limit - buffer;
662 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
663 memcpy (tmp_buf + tmp_len, buffer, num);
668 input_line_pointer = ends ? ends + 8 : NULL;
676 input_line_pointer = ends + 8;
678 new_buf = xmalloc (100);
683 scrub_last_string = ends;
688 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
692 if (new_tmp == new_buf + new_length)
694 new_buf = xrealloc (new_buf, new_length + 100);
695 new_tmp = new_buf + new_length;
703 old_input = input_line_pointer;
704 old_limit = buffer_limit;
706 input_line_pointer = new_buf;
707 buffer_limit = new_tmp;
711 HANDLE_CONDITIONAL_ASSEMBLY ();
713 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
714 input_line_pointer--; /* Report unknown char as ignored. */
715 ignore_rest_of_line ();
716 } /* while (input_line_pointer<buffer_limit) */
719 bump_line_counters ();
723 input_line_pointer = old_input;
724 buffer_limit = old_limit;
729 } /* while (more buffers to scan) */
730 input_scrub_close (); /* Close the input file */
738 as_fatal (".abort detected. Abandoning ship.");
741 /* Guts of .align directive. */
748 md_do_align (n, fill, just_record_alignment);
752 /* @@ Fix this right for BFD! */
754 static char nop_opcode = NOP_OPCODE;
756 if (now_seg != data_section && now_seg != bss_section)
765 /* Only make a frag if we HAVE to. . . */
766 if (n && !need_pass_2)
767 frag_align (n, *fill);
770 just_record_alignment:
773 record_alignment (now_seg, n);
776 /* For machines where ".align 4" means align to a 4 byte boundary. */
781 register unsigned int temp;
784 unsigned long max_alignment = 1 << 15;
786 if (is_end_of_line[(unsigned char) *input_line_pointer])
787 temp = arg; /* Default value from pseudo-op table */
789 temp = get_absolute_expression ();
791 if (temp > max_alignment)
793 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
796 /* For the sparc, `.align (1<<n)' actually means `.align n' so we
797 have to convert it. */
800 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
804 as_bad ("Alignment not a power of 2");
807 if (*input_line_pointer == ',')
809 input_line_pointer++;
810 temp_fill = get_absolute_expression ();
811 do_align (temp, &temp_fill);
814 do_align (temp, (char *) 0);
816 demand_empty_rest_of_line ();
819 /* For machines where ".align 4" means align to 2**4 boundary. */
821 s_align_ptwo (ignore)
826 long max_alignment = 15;
828 temp = get_absolute_expression ();
829 if (temp > max_alignment)
830 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
833 as_bad ("Alignment negative. 0 assumed.");
836 if (*input_line_pointer == ',')
838 input_line_pointer++;
839 temp_fill = get_absolute_expression ();
840 do_align (temp, &temp_fill);
843 do_align (temp, (char *) 0);
845 demand_empty_rest_of_line ();
856 register symbolS *symbolP;
858 name = input_line_pointer;
859 c = get_symbol_end ();
860 /* just after name is now '\0' */
861 p = input_line_pointer;
864 if (*input_line_pointer != ',')
866 as_bad ("Expected comma after symbol-name: rest of line ignored.");
867 ignore_rest_of_line ();
870 input_line_pointer++; /* skip ',' */
871 if ((temp = get_absolute_expression ()) < 0)
873 as_warn (".COMMon length (%ld.) <0! Ignored.", (long) temp);
874 ignore_rest_of_line ();
878 symbolP = symbol_find_or_make (name);
880 if (S_IS_DEFINED (symbolP))
882 as_bad ("Ignoring attempt to re-define symbol `%s'.",
883 S_GET_NAME (symbolP));
884 ignore_rest_of_line ();
887 if (S_GET_VALUE (symbolP))
889 if (S_GET_VALUE (symbolP) != (valueT) temp)
890 as_bad ("Length of .comm \"%s\" is already %ld. Not changed to %ld.",
891 S_GET_NAME (symbolP),
892 (long) S_GET_VALUE (symbolP),
897 S_SET_VALUE (symbolP, (valueT) temp);
898 S_SET_EXTERNAL (symbolP);
903 if ( (!temp) || !flag_one)
904 S_GET_OTHER(symbolP) = const_flag;
906 #endif /* not OBJ_VMS */
907 know (symbolP->sy_frag == &zero_address_frag);
908 demand_empty_rest_of_line ();
918 temp = get_absolute_expression ();
919 if (flag_readonly_data_in_text)
921 section = text_section;
925 section = data_section;
927 subseg_set (section, (subsegT) temp);
932 demand_empty_rest_of_line ();
935 /* Handle the .appfile pseudo-op. This is automatically generated by
936 do_scrub_next_char when a preprocessor # line comment is seen with
937 a file name. This default definition may be overridden by the
938 object or CPU specific pseudo-ops. This function is also the
939 default definition for .file; the APPFILE argument is 1 for
940 .appfile, 0 for .file. */
949 /* Some assemblers tolerate immediately following '"' */
950 if ((s = demand_copy_string (&length)) != 0)
952 /* If this is a fake .appfile, a fake newline was inserted into
953 the buffer. Passing -2 to new_logical_line tells it to
955 new_logical_line (s, appfile ? -2 : -1);
956 demand_empty_rest_of_line ();
959 listing_source_file (s);
967 /* Handle the .appline pseudo-op. This is automatically generated by
968 do_scrub_next_char when a preprocessor # line comment is seen.
969 This default definition may be overridden by the object or CPU
970 specific pseudo-ops. */
978 /* The given number is that of the next line. */
979 l = get_absolute_expression () - 1;
981 /* Some of the back ends can't deal with non-positive line numbers.
982 Besides, it's silly. */
983 as_warn ("Line numbers must be positive; line number %d rejected.", l+1);
986 new_logical_line ((char *) NULL, l);
989 listing_source_line (l);
992 demand_empty_rest_of_line ();
999 long temp_repeat = 0;
1001 register long temp_fill = 0;
1005 temp_repeat = get_absolute_expression ();
1006 if (*input_line_pointer == ',')
1008 input_line_pointer++;
1009 temp_size = get_absolute_expression ();
1010 if (*input_line_pointer == ',')
1012 input_line_pointer++;
1013 temp_fill = get_absolute_expression ();
1016 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
1017 #define BSD_FILL_SIZE_CROCK_8 (8)
1018 if (temp_size > BSD_FILL_SIZE_CROCK_8)
1020 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
1021 temp_size = BSD_FILL_SIZE_CROCK_8;
1025 as_warn ("Size negative: .fill ignored.");
1028 else if (temp_repeat <= 0)
1030 as_warn ("Repeat < 0, .fill ignored");
1034 if (temp_size && !need_pass_2)
1036 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
1037 memset (p, 0, (unsigned int) temp_size);
1038 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
1039 * flavoured AS. The following bizzare behaviour is to be
1040 * compatible with above. I guess they tried to take up to 8
1041 * bytes from a 4-byte expression and they forgot to sign
1042 * extend. Un*x Sux. */
1043 #define BSD_FILL_SIZE_CROCK_4 (4)
1044 md_number_to_chars (p, (valueT) temp_fill,
1045 (temp_size > BSD_FILL_SIZE_CROCK_4
1046 ? BSD_FILL_SIZE_CROCK_4
1047 : (int) temp_size));
1048 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
1049 * but emits no error message because it seems a legal thing to do.
1050 * It is a degenerate case of .fill but could be emitted by a compiler.
1053 demand_empty_rest_of_line ();
1066 name = input_line_pointer;
1067 c = get_symbol_end ();
1068 symbolP = symbol_find_or_make (name);
1069 *input_line_pointer = c;
1071 S_SET_EXTERNAL (symbolP);
1074 input_line_pointer++;
1076 if (*input_line_pointer == '\n')
1081 demand_empty_rest_of_line ();
1085 s_lcomm (needs_align)
1086 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1087 (alignment); 0 if it was an ".lcomm" (2 args only) */
1090 register char *name;
1094 register symbolS *symbolP;
1095 segT current_seg = now_seg;
1096 subsegT current_subseg = now_subseg;
1097 const int max_alignment = 15;
1099 segT bss_seg = bss_section;
1101 name = input_line_pointer;
1102 c = get_symbol_end ();
1103 p = input_line_pointer;
1107 /* Accept an optional comma after the name. The comma used to be
1108 required, but Irix 5 cc does not generate it. */
1109 if (*input_line_pointer == ',')
1111 ++input_line_pointer;
1115 if (*input_line_pointer == '\n')
1117 as_bad ("Missing size expression");
1121 if ((temp = get_absolute_expression ()) < 0)
1123 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1124 ignore_rest_of_line ();
1128 #if defined (TC_MIPS) || defined (TC_ALPHA)
1129 #if defined (OBJ_ECOFF) || defined (OBJ_ELF)
1130 /* For MIPS and Alpha ECOFF or ELF, small objects are put in .sbss. */
1131 if (temp <= bfd_get_gp_size (stdoutput))
1133 bss_seg = subseg_new (".sbss", 1);
1134 seg_info (bss_seg)->bss = 1;
1140 /* FIXME. This needs to be machine independent. */
1150 record_alignment(bss_seg, align);
1157 if (*input_line_pointer != ',')
1159 as_bad ("Expected comma after size");
1160 ignore_rest_of_line ();
1163 input_line_pointer++;
1165 if (*input_line_pointer == '\n')
1167 as_bad ("Missing alignment");
1170 align = get_absolute_expression ();
1171 if (align > max_alignment)
1173 align = max_alignment;
1174 as_warn ("Alignment too large: %d. assumed.", align);
1179 as_warn ("Alignment negative. 0 assumed.");
1181 record_alignment (bss_seg, align);
1182 } /* if needs align */
1185 /* Assume some objects may require alignment on some systems. */
1189 align = ffs (temp) - 1;
1190 if (temp % (1 << align))
1197 symbolP = symbol_find_or_make (name);
1201 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1202 S_GET_OTHER (symbolP) == 0 &&
1203 S_GET_DESC (symbolP) == 0 &&
1204 #endif /* OBJ_AOUT or OBJ_BOUT */
1205 (S_GET_SEGMENT (symbolP) == bss_seg
1206 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1210 subseg_set (bss_seg, 1);
1213 frag_align (align, 0);
1214 /* detach from old frag */
1215 if (S_GET_SEGMENT (symbolP) == bss_seg)
1216 symbolP->sy_frag->fr_symbol = NULL;
1218 symbolP->sy_frag = frag_now;
1219 pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1223 S_SET_SEGMENT (symbolP, bss_seg);
1226 /* The symbol may already have been created with a preceding
1227 ".globl" directive -- be careful not to step on storage class
1228 in that case. Otherwise, set it to static. */
1229 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1231 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1233 #endif /* OBJ_COFF */
1236 as_bad ("Ignoring attempt to re-define symbol `%s'.",
1237 S_GET_NAME (symbolP));
1239 subseg_set (current_seg, current_subseg);
1241 demand_empty_rest_of_line ();
1248 register char *name;
1252 register symbolS *symbolP;
1254 /* we permit ANY defined expression: BSD4.2 demands constants */
1255 name = input_line_pointer;
1256 c = get_symbol_end ();
1257 p = input_line_pointer;
1260 if (*input_line_pointer != ',')
1263 as_bad ("Expected comma after name \"%s\"", name);
1265 ignore_rest_of_line ();
1268 input_line_pointer++;
1270 if (exp.X_op != O_constant
1271 && exp.X_op != O_register)
1273 as_bad ("bad expression");
1274 ignore_rest_of_line ();
1278 symbolP = symbol_find_or_make (name);
1280 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1281 symbolP->sy_desc == 0) out of this test because coff doesn't have
1282 those fields, and I can't see when they'd ever be tripped. I
1283 don't think I understand why they were here so I may have
1284 introduced a bug. As recently as 1.37 didn't have this test
1285 anyway. xoxorich. */
1287 if (S_GET_SEGMENT (symbolP) == undefined_section
1288 && S_GET_VALUE (symbolP) == 0)
1290 /* The name might be an undefined .global symbol; be sure to
1291 keep the "external" bit. */
1292 S_SET_SEGMENT (symbolP,
1293 (exp.X_op == O_constant
1296 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1300 as_bad ("Symbol %s already defined", name);
1303 demand_empty_rest_of_line ();
1310 register segT segment;
1312 register long temp_fill;
1314 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1315 thing as a sub-segment-relative origin. Any absolute origin is
1316 given a warning, then assumed to be segment-relative. Any
1317 segmented origin expression ("foo+42") had better be in the right
1318 segment or the .org is ignored.
1320 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1321 we never know sub-segment sizes when we are reading code. BSD
1322 will crash trying to emit negative numbers of filler bytes in
1323 certain .orgs. We don't crash, but see as-write for that code.
1325 Don't make frag if need_pass_2==1. */
1326 segment = get_known_segmented_expression (&exp);
1327 if (*input_line_pointer == ',')
1329 input_line_pointer++;
1330 temp_fill = get_absolute_expression ();
1336 if (segment != now_seg && segment != absolute_section)
1337 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1338 segment_name (segment), segment_name (now_seg));
1339 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1340 exp.X_add_number, (char *) 0);
1342 } /* if (ok to make frag) */
1343 demand_empty_rest_of_line ();
1350 register char *name;
1351 register char delim;
1352 register char *end_name;
1353 register symbolS *symbolP;
1356 * Especial apologies for the random logic:
1357 * this just grew, and could be parsed much more simply!
1360 name = input_line_pointer;
1361 delim = get_symbol_end ();
1362 end_name = input_line_pointer;
1366 if (*input_line_pointer != ',')
1369 as_bad ("Expected comma after name \"%s\"", name);
1371 ignore_rest_of_line ();
1375 input_line_pointer++;
1378 if (name[0] == '.' && name[1] == '\0')
1380 /* Turn '. = mumble' into a .org mumble */
1381 register segT segment;
1385 segment = get_known_segmented_expression (&exp);
1389 if (segment != now_seg && segment != absolute_section)
1390 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1391 segment_name (segment),
1392 segment_name (now_seg));
1393 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1394 exp.X_add_number, (char *) 0);
1396 } /* if (ok to make frag) */
1402 if ((symbolP = symbol_find (name)) == NULL
1403 && (symbolP = md_undefined_symbol (name)) == NULL)
1405 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1407 /* "set" symbols are local unless otherwise specified. */
1408 SF_SET_LOCAL (symbolP);
1409 #endif /* OBJ_COFF */
1411 } /* make a new symbol */
1413 symbol_table_insert (symbolP);
1416 pseudo_set (symbolP);
1417 demand_empty_rest_of_line ();
1428 /* Just like .fill, but temp_size = 1 */
1430 if (exp.X_op == O_constant)
1434 repeat = exp.X_add_number;
1439 as_warn (".space repeat count is %s, ignored",
1440 repeat ? "negative" : "zero");
1441 ignore_rest_of_line ();
1446 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1447 repeat, (char *) 0);
1452 p = frag_var (rs_space, 1, 1, (relax_substateT) 0,
1453 make_expr_symbol (&exp), 0L, (char *) 0);
1456 if (*input_line_pointer == ',')
1458 input_line_pointer++;
1459 temp_fill = get_absolute_expression ();
1469 demand_empty_rest_of_line ();
1478 temp = get_absolute_expression ();
1479 subseg_set (text_section, (subsegT) temp);
1480 demand_empty_rest_of_line ();
1482 const_flag &= ~IN_DEFAULT_SECTION;
1488 demand_empty_rest_of_line ()
1491 if (is_end_of_line[(unsigned char) *input_line_pointer])
1493 input_line_pointer++;
1497 ignore_rest_of_line ();
1499 /* Return having already swallowed end-of-line. */
1500 } /* Return pointing just after end-of-line. */
1503 ignore_rest_of_line () /* For suspect lines: gives warning. */
1505 if (!is_end_of_line[(unsigned char) *input_line_pointer])
1507 if (isprint (*input_line_pointer))
1508 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1509 *input_line_pointer);
1511 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1512 *input_line_pointer);
1513 while (input_line_pointer < buffer_limit
1514 && !is_end_of_line[(unsigned char) *input_line_pointer])
1516 input_line_pointer++;
1519 input_line_pointer++; /* Return pointing just after end-of-line. */
1520 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
1526 * In: Pointer to a symbol.
1527 * Input_line_pointer->expression.
1529 * Out: Input_line_pointer->just after any whitespace after expression.
1530 * Tried to set symbol to value of expression.
1531 * Will change symbols type, value, and frag;
1534 pseudo_set (symbolP)
1538 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
1540 #endif /* OBJ_AOUT or OBJ_BOUT */
1542 know (symbolP); /* NULL pointer is logic error. */
1543 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
1544 ext = S_IS_EXTERNAL (symbolP);
1545 #endif /* OBJ_AOUT or OBJ_BOUT */
1547 (void) expression (&exp);
1549 if (exp.X_op == O_illegal)
1550 as_bad ("illegal expression; zero assumed");
1551 else if (exp.X_op == O_absent)
1552 as_bad ("missing expression; zero assumed");
1553 else if (exp.X_op == O_big)
1554 as_bad ("%s number invalid; zero assumed",
1555 exp.X_add_number > 0 ? "bignum" : "floating point");
1556 else if (exp.X_op == O_subtract
1557 && (S_GET_SEGMENT (exp.X_add_symbol)
1558 == S_GET_SEGMENT (exp.X_op_symbol))
1559 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
1560 && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
1562 exp.X_op = O_constant;
1563 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
1564 - S_GET_VALUE (exp.X_op_symbol));
1572 exp.X_add_number = 0;
1575 S_SET_SEGMENT (symbolP, absolute_section);
1576 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
1578 S_SET_EXTERNAL (symbolP);
1580 S_CLEAR_EXTERNAL (symbolP);
1581 #endif /* OBJ_AOUT or OBJ_BOUT */
1582 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1583 symbolP->sy_frag = &zero_address_frag;
1587 S_SET_SEGMENT (symbolP, reg_section);
1588 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1589 symbolP->sy_frag = &zero_address_frag;
1593 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section
1594 || exp.X_add_number != 0)
1595 symbolP->sy_value = exp;
1598 symbolS *s = exp.X_add_symbol;
1600 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (s));
1601 #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
1603 S_SET_EXTERNAL (symbolP);
1605 S_CLEAR_EXTERNAL (symbolP);
1606 #endif /* OBJ_AOUT or OBJ_BOUT */
1607 S_SET_VALUE (symbolP,
1608 exp.X_add_number + S_GET_VALUE (s));
1609 symbolP->sy_frag = s->sy_frag;
1610 copy_symbol_attributes (symbolP, s);
1615 /* The value is some complex expression.
1616 FIXME: Should we set the segment to anything? */
1617 symbolP->sy_value = exp;
1625 * CONStruct more frag of .bytes, or .words etc.
1626 * Should need_pass_2 be 1 then emit no frag(s).
1627 * This understands EXPRESSIONS.
1631 * This has a split personality. We use expression() to read the
1632 * value. We can detect if the value won't fit in a byte or word.
1633 * But we can't detect if expression() discarded significant digits
1634 * in the case of a long. Not worth the crocks required to fix it.
1637 /* Select a parser for cons expressions. */
1639 /* Some targets need to parse the expression in various fancy ways.
1640 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1641 (for example, the HPPA does this). Otherwise, you can define
1642 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1643 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1644 are defined, which is the normal case, then only simple expressions
1647 #ifndef TC_PARSE_CONS_EXPRESSION
1648 #ifdef BITFIELD_CONS_EXPRESSIONS
1649 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1651 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1654 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1656 parse_mri_cons PARAMS ((expressionS *exp));
1658 #ifdef REPEAT_CONS_EXPRESSIONS
1659 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1661 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1664 /* If we haven't gotten one yet, just call expression. */
1665 #ifndef TC_PARSE_CONS_EXPRESSION
1666 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1670 /* worker to do .byte etc statements */
1671 /* clobbers input_line_pointer, checks */
1675 register int nbytes; /* 1=.byte, 2=.word, 4=.long */
1679 if (is_it_end_of_statement ())
1681 demand_empty_rest_of_line ();
1687 TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
1688 emit_expr (&exp, (unsigned int) nbytes);
1690 while (*input_line_pointer++ == ',');
1692 input_line_pointer--; /* Put terminator back into stream. */
1693 demand_empty_rest_of_line ();
1696 /* Put the contents of expression EXP into the object file using
1697 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1700 emit_expr (exp, nbytes)
1702 unsigned int nbytes;
1706 valueT extra_digit = 0;
1708 /* Don't do anything if we are going to make another pass. */
1714 /* Handle a negative bignum. */
1716 && exp->X_add_number == 0
1717 && exp->X_add_symbol->sy_value.X_op == O_big
1718 && exp->X_add_symbol->sy_value.X_add_number > 0)
1721 unsigned long carry;
1723 exp = &exp->X_add_symbol->sy_value;
1725 /* Negate the bignum: one's complement each digit and add 1. */
1727 for (i = 0; i < exp->X_add_number; i++)
1731 next = (((~ (generic_bignum[i] & LITTLENUM_MASK))
1734 generic_bignum[i] = next & LITTLENUM_MASK;
1735 carry = next >> LITTLENUM_NUMBER_OF_BITS;
1738 /* We can ignore any carry out, because it will be handled by
1739 extra_digit if it is needed. */
1741 extra_digit = (valueT) -1;
1745 if (op == O_absent || op == O_illegal)
1747 as_warn ("zero assumed for missing expression");
1748 exp->X_add_number = 0;
1751 else if (op == O_big && exp->X_add_number <= 0)
1753 as_bad ("floating point number invalid; zero assumed");
1754 exp->X_add_number = 0;
1757 else if (op == O_register)
1759 as_warn ("register value used as expression");
1763 p = frag_more ((int) nbytes);
1765 #ifndef WORKING_DOT_WORD
1766 /* If we have the difference of two symbols in a word, save it on
1767 the broken_words list. See the code in write.c. */
1768 if (op == O_subtract && nbytes == 2)
1770 struct broken_word *x;
1772 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1773 x->next_broken_word = broken_words;
1776 x->word_goes_here = p;
1778 x->add = exp->X_add_symbol;
1779 x->sub = exp->X_op_symbol;
1780 x->addnum = exp->X_add_number;
1787 /* If we have an integer, but the number of bytes is too large to
1788 pass to md_number_to_chars, handle it as a bignum. */
1789 if (op == O_constant && nbytes > sizeof (valueT))
1794 if (! exp->X_unsigned && exp->X_add_number < 0)
1795 extra_digit = (valueT) -1;
1796 val = (valueT) exp->X_add_number;
1800 generic_bignum[gencnt] = val & LITTLENUM_MASK;
1801 val >>= LITTLENUM_NUMBER_OF_BITS;
1805 op = exp->X_op = O_big;
1806 exp->X_add_number = gencnt;
1809 if (op == O_constant)
1811 register valueT get;
1812 register valueT use;
1813 register valueT mask;
1814 register valueT unmask;
1816 /* JF << of >= number of bits in the object is undefined. In
1817 particular SPARC (Sun 4) has problems */
1818 if (nbytes >= sizeof (valueT))
1821 mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1823 unmask = ~mask; /* Do store these bits. */
1826 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1827 mask = ~(unmask >> 1); /* Includes sign bit now. */
1830 get = exp->X_add_number;
1832 if ((get & mask) != 0 && (get & mask) != mask)
1833 { /* Leading bits contain both 0s & 1s. */
1834 as_warn ("Value 0x%lx truncated to 0x%lx.", get, use);
1836 /* put bytes in right order. */
1837 md_number_to_chars (p, use, (int) nbytes);
1839 else if (op == O_big)
1842 LITTLENUM_TYPE *nums;
1844 know (nbytes % CHARS_PER_LITTLENUM == 0);
1846 size = exp->X_add_number * CHARS_PER_LITTLENUM;
1849 as_warn ("Bignum truncated to %d bytes", nbytes);
1853 if (target_big_endian)
1855 while (nbytes > size)
1857 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1858 nbytes -= CHARS_PER_LITTLENUM;
1859 p += CHARS_PER_LITTLENUM;
1862 nums = generic_bignum + size / CHARS_PER_LITTLENUM;
1866 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1867 size -= CHARS_PER_LITTLENUM;
1868 p += CHARS_PER_LITTLENUM;
1873 nums = generic_bignum;
1876 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1878 size -= CHARS_PER_LITTLENUM;
1879 p += CHARS_PER_LITTLENUM;
1880 nbytes -= CHARS_PER_LITTLENUM;
1885 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1886 nbytes -= CHARS_PER_LITTLENUM;
1887 p += CHARS_PER_LITTLENUM;
1893 memset (p, 0, nbytes);
1895 /* Now we need to generate a fixS to record the symbol value.
1896 This is easy for BFD. For other targets it can be more
1897 complex. For very complex cases (currently, the HPPA and
1898 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1899 want. For simpler cases, you can define TC_CONS_RELOC to be
1900 the name of the reloc code that should be stored in the fixS.
1901 If neither is defined, the code uses NO_RELOC if it is
1902 defined, and otherwise uses 0. */
1904 #ifdef BFD_ASSEMBLER
1905 #ifdef TC_CONS_FIX_NEW
1906 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1908 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1909 /* @@ Should look at CPU word size. */
1910 nbytes == 2 ? BFD_RELOC_16
1911 : nbytes == 8 ? BFD_RELOC_64
1915 #ifdef TC_CONS_FIX_NEW
1916 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1918 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1919 it is defined, otherwise use NO_RELOC if it is defined,
1921 #ifndef TC_CONS_RELOC
1923 #define TC_CONS_RELOC NO_RELOC
1925 #define TC_CONS_RELOC 0
1928 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1930 #endif /* TC_CONS_FIX_NEW */
1931 #endif /* BFD_ASSEMBLER */
1935 #ifdef BITFIELD_CONS_EXPRESSIONS
1937 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1938 w:x,y:z, where w and y are bitwidths and x and y are values. They
1939 then pack them all together. We do a little better in that we allow
1940 them in words, longs, etc. and we'll pack them in target byte order
1943 The rules are: pack least significat bit first, if a field doesn't
1944 entirely fit, put it in the next unit. Overflowing the bitfield is
1945 explicitly *not* even a warning. The bitwidth should be considered
1948 To use this function the tc-XXX.h file should define
1949 BITFIELD_CONS_EXPRESSIONS. */
1952 parse_bitfield_cons (exp, nbytes)
1954 unsigned int nbytes;
1956 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1957 char *hold = input_line_pointer;
1959 (void) expression (exp);
1961 if (*input_line_pointer == ':')
1967 unsigned long width;
1969 if (*input_line_pointer != ':')
1971 input_line_pointer = hold;
1973 } /* next piece is not a bitfield */
1975 /* In the general case, we can't allow
1976 full expressions with symbol
1977 differences and such. The relocation
1978 entries for symbols not defined in this
1979 assembly would require arbitrary field
1980 widths, positions, and masks which most
1981 of our current object formats don't
1984 In the specific case where a symbol
1985 *is* defined in this assembly, we
1986 *could* build fixups and track it, but
1987 this could lead to confusion for the
1988 backends. I'm lazy. I'll take any
1989 SEG_ABSOLUTE. I think that means that
1990 you can use a previous .set or
1991 .equ type symbol. xoxorich. */
1993 if (exp->X_op == O_absent)
1995 as_warn ("using a bit field width of zero");
1996 exp->X_add_number = 0;
1997 exp->X_op = O_constant;
1998 } /* implied zero width bitfield */
2000 if (exp->X_op != O_constant)
2002 *input_line_pointer = '\0';
2003 as_bad ("field width \"%s\" too complex for a bitfield", hold);
2004 *input_line_pointer = ':';
2005 demand_empty_rest_of_line ();
2009 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
2011 as_warn ("field width %lu too big to fit in %d bytes: truncated to %d bits",
2012 width, nbytes, (BITS_PER_CHAR * nbytes));
2013 width = BITS_PER_CHAR * nbytes;
2016 if (width > bits_available)
2018 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
2019 input_line_pointer = hold;
2020 exp->X_add_number = value;
2024 hold = ++input_line_pointer; /* skip ':' */
2026 (void) expression (exp);
2027 if (exp->X_op != O_constant)
2029 char cache = *input_line_pointer;
2031 *input_line_pointer = '\0';
2032 as_bad ("field value \"%s\" too complex for a bitfield", hold);
2033 *input_line_pointer = cache;
2034 demand_empty_rest_of_line ();
2038 value |= ((~(-1 << width) & exp->X_add_number)
2039 << ((BITS_PER_CHAR * nbytes) - bits_available));
2041 if ((bits_available -= width) == 0
2042 || is_it_end_of_statement ()
2043 || *input_line_pointer != ',')
2046 } /* all the bitfields we're gonna get */
2048 hold = ++input_line_pointer;
2049 (void) expression (exp);
2050 } /* forever loop */
2052 exp->X_add_number = value;
2053 exp->X_op = O_constant;
2054 exp->X_unsigned = 1;
2055 } /* if looks like a bitfield */
2056 } /* parse_bitfield_cons() */
2058 #endif /* BITFIELD_CONS_EXPRESSIONS */
2063 parse_mri_cons (exp, nbytes)
2065 unsigned int nbytes;
2067 if (*input_line_pointer == '\'')
2069 /* An MRI style string, cut into as many bytes as will fit into
2070 a nbyte chunk, left justify if necessary, and separate with
2071 commas so we can try again later */
2073 unsigned int result = 0;
2074 input_line_pointer++;
2075 for (scan = 0; scan < nbytes; scan++)
2077 if (*input_line_pointer == '\'')
2079 if (input_line_pointer[1] == '\'')
2081 input_line_pointer++;
2086 result = (result << 8) | (*input_line_pointer++);
2090 while (scan < nbytes)
2095 /* Create correct expression */
2096 exp->X_op = O_constant;
2097 exp->X_add_number = result;
2098 /* Fake it so that we can read the next char too */
2099 if (input_line_pointer[0] != '\'' ||
2100 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
2102 input_line_pointer -= 2;
2103 input_line_pointer[0] = ',';
2104 input_line_pointer[1] = '\'';
2107 input_line_pointer++;
2115 #ifdef REPEAT_CONS_EXPRESSIONS
2117 /* Parse a repeat expression for cons. This is used by the MIPS
2118 assembler. The format is NUMBER:COUNT; NUMBER appears in the
2119 object file COUNT times.
2121 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
2124 parse_repeat_cons (exp, nbytes)
2126 unsigned int nbytes;
2133 if (*input_line_pointer != ':')
2135 /* No repeat count. */
2139 ++input_line_pointer;
2140 expression (&count);
2141 if (count.X_op != O_constant
2142 || count.X_add_number <= 0)
2144 as_warn ("Unresolvable or nonpositive repeat count; using 1");
2148 /* The cons function is going to output this expression once. So we
2149 output it count - 1 times. */
2150 for (i = count.X_add_number - 1; i > 0; i--)
2151 emit_expr (exp, nbytes);
2154 #endif /* REPEAT_CONS_EXPRESSIONS */
2159 * CONStruct some more frag chars of .floats .ffloats etc.
2160 * Makes 0 or more new frags.
2161 * If need_pass_2 == 1, no frags are emitted.
2162 * This understands only floating literals, not expressions. Sorry.
2164 * A floating constant is defined by atof_generic(), except it is preceded
2165 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2166 * reading, I decided to be incompatible. This always tries to give you
2167 * rounded bits to the precision of the pseudo-op. Former AS did premature
2168 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2169 * a choice of 2 flavours of noise according to which of 2 floating-point
2170 * scanners you directed AS to use.
2172 * In: input_line_pointer->whitespace before, or '0' of flonum.
2177 float_cons (float_type)
2178 /* Clobbers input_line-pointer, checks end-of-line. */
2179 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2182 int length; /* Number of chars in an object. */
2183 register char *err; /* Error from scanning floating literal. */
2184 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2186 if (is_it_end_of_statement ())
2188 demand_empty_rest_of_line ();
2194 /* input_line_pointer->1st char of a flonum (we hope!). */
2197 /* Skip any 0{letter} that may be present. Don't even check if the
2198 * letter is legal. Someone may invent a "z" format and this routine
2199 * has no use for such information. Lusers beware: you get
2200 * diagnostics if your input is ill-conditioned.
2202 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2203 input_line_pointer += 2;
2205 err = md_atof (float_type, temp, &length);
2206 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2210 as_bad ("Bad floating literal: %s", err);
2211 ignore_rest_of_line ();
2221 #ifdef REPEAT_CONS_EXPRESSIONS
2222 if (*input_line_pointer == ':')
2224 expressionS count_exp;
2226 ++input_line_pointer;
2227 expression (&count_exp);
2228 if (count_exp.X_op != O_constant
2229 || count_exp.X_add_number <= 0)
2231 as_warn ("unresolvable or nonpositive repeat count; using 1");
2234 count = count_exp.X_add_number;
2238 while (--count >= 0)
2240 p = frag_more (length);
2241 memcpy (p, temp, (unsigned int) length);
2246 while (*input_line_pointer++ == ',');
2248 --input_line_pointer; /* Put terminator back into stream. */
2249 demand_empty_rest_of_line ();
2250 } /* float_cons() */
2255 * We read 0 or more ',' seperated, double-quoted strings.
2257 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2262 stringer (append_zero) /* Worker to do .ascii etc statements. */
2263 /* Checks end-of-line. */
2264 register int append_zero; /* 0: don't append '\0', else 1 */
2266 register unsigned int c;
2269 * The following awkward logic is to parse ZERO or more strings,
2270 * comma seperated. Recall a string expression includes spaces
2271 * before the opening '\"' and spaces after the closing '\"'.
2272 * We fake a leading ',' if there is (supposed to be)
2273 * a 1st, expression. We keep demanding expressions for each
2276 if (is_it_end_of_statement ())
2278 c = 0; /* Skip loop. */
2279 ++input_line_pointer; /* Compensate for end of loop. */
2283 c = ','; /* Do loop. */
2285 while (c == ',' || c == '<' || c == '"')
2288 switch (*input_line_pointer)
2291 ++input_line_pointer; /*->1st char of string. */
2292 while (is_a_char (c = next_char_of_string ()))
2294 FRAG_APPEND_1_CHAR (c);
2298 FRAG_APPEND_1_CHAR (0);
2300 know (input_line_pointer[-1] == '\"');
2303 input_line_pointer++;
2304 c = get_single_number ();
2305 FRAG_APPEND_1_CHAR (c);
2306 if (*input_line_pointer != '>')
2308 as_bad ("Expected <nn>");
2310 input_line_pointer++;
2313 input_line_pointer++;
2317 c = *input_line_pointer;
2320 demand_empty_rest_of_line ();
2323 /* FIXME-SOMEDAY: I had trouble here on characters with the
2324 high bits set. We'll probably also have trouble with
2325 multibyte chars, wide chars, etc. Also be careful about
2326 returning values bigger than 1 byte. xoxorich. */
2329 next_char_of_string ()
2331 register unsigned int c;
2333 c = *input_line_pointer++ & CHAR_MASK;
2340 #ifndef NO_STRING_ESCAPES
2342 switch (c = *input_line_pointer++)
2372 break; /* As itself. */
2388 for (i = 0, number = 0; isdigit (c) && i < 3; c = *input_line_pointer++, i++)
2390 number = number * 8 + c - '0';
2394 --input_line_pointer;
2403 c = *input_line_pointer++;
2404 while (isxdigit (c))
2407 number = number * 16 + c - '0';
2408 else if (isupper (c))
2409 number = number * 16 + c - 'A' + 10;
2411 number = number * 16 + c - 'a' + 10;
2412 c = *input_line_pointer++;
2415 --input_line_pointer;
2420 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2421 as_warn ("Unterminated string: Newline inserted.");
2427 #ifdef ONLY_STANDARD_ESCAPES
2428 as_bad ("Bad escaped character in string, '?' assumed");
2430 #endif /* ONLY_STANDARD_ESCAPES */
2433 } /* switch on escaped char */
2435 #endif /* ! defined (NO_STRING_ESCAPES) */
2439 } /* switch on char */
2441 } /* next_char_of_string() */
2444 get_segmented_expression (expP)
2445 register expressionS *expP;
2447 register segT retval;
2449 retval = expression (expP);
2450 if (expP->X_op == O_illegal
2451 || expP->X_op == O_absent
2452 || expP->X_op == O_big)
2454 as_bad ("expected address expression; zero assumed");
2455 expP->X_op = O_constant;
2456 expP->X_add_number = 0;
2457 retval = absolute_section;
2463 get_known_segmented_expression (expP)
2464 register expressionS *expP;
2466 register segT retval;
2468 if ((retval = get_segmented_expression (expP)) == undefined_section)
2470 /* There is no easy way to extract the undefined symbol from the
2472 if (expP->X_add_symbol != NULL
2473 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
2474 as_warn ("symbol \"%s\" undefined; zero assumed",
2475 S_GET_NAME (expP->X_add_symbol));
2477 as_warn ("some symbol undefined; zero assumed");
2478 retval = absolute_section;
2479 expP->X_op = O_constant;
2480 expP->X_add_number = 0;
2482 know (retval == absolute_section || SEG_NORMAL (retval));
2484 } /* get_known_segmented_expression() */
2487 get_absolute_expression ()
2492 if (exp.X_op != O_constant)
2494 if (exp.X_op != O_absent)
2495 as_bad ("bad or irreducible absolute expression; zero assumed");
2496 exp.X_add_number = 0;
2498 return exp.X_add_number;
2501 char /* return terminator */
2502 get_absolute_expression_and_terminator (val_pointer)
2503 long *val_pointer; /* return value of expression */
2505 /* FIXME: val_pointer should probably be offsetT *. */
2506 *val_pointer = (long) get_absolute_expression ();
2507 return (*input_line_pointer++);
2511 * demand_copy_C_string()
2513 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2514 * Give a warning if that happens.
2517 demand_copy_C_string (len_pointer)
2522 if ((s = demand_copy_string (len_pointer)) != 0)
2526 for (len = *len_pointer;
2535 as_bad ("This string may not contain \'\\0\'");
2543 * demand_copy_string()
2545 * Demand string, but return a safe (=private) copy of the string.
2546 * Return NULL if we can't read a string here.
2549 demand_copy_string (lenP)
2552 register unsigned int c;
2558 if (*input_line_pointer == '\"')
2560 input_line_pointer++; /* Skip opening quote. */
2562 while (is_a_char (c = next_char_of_string ()))
2564 obstack_1grow (¬es, c);
2567 /* JF this next line is so demand_copy_C_string will return a null
2568 termanated string. */
2569 obstack_1grow (¬es, '\0');
2570 retval = obstack_finish (¬es);
2574 as_warn ("Missing string");
2576 ignore_rest_of_line ();
2580 } /* demand_copy_string() */
2583 * is_it_end_of_statement()
2585 * In: Input_line_pointer->next character.
2587 * Do: Skip input_line_pointer over all whitespace.
2589 * Out: 1 if input_line_pointer->end-of-line.
2592 is_it_end_of_statement ()
2595 return (is_end_of_line[(unsigned char) *input_line_pointer]);
2596 } /* is_it_end_of_statement() */
2602 register symbolS *symbolP; /* symbol we are working with */
2604 input_line_pointer++;
2605 if (*input_line_pointer == '=')
2606 input_line_pointer++;
2608 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2609 input_line_pointer++;
2611 if (sym_name[0] == '.' && sym_name[1] == '\0')
2613 /* Turn '. = mumble' into a .org mumble */
2614 register segT segment;
2618 segment = get_known_segmented_expression (&exp);
2621 if (segment != now_seg && segment != absolute_section)
2622 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2623 segment_name (segment),
2624 segment_name (now_seg));
2625 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2626 exp.X_add_number, (char *) 0);
2628 } /* if (ok to make frag) */
2632 symbolP = symbol_find_or_make (sym_name);
2633 pseudo_set (symbolP);
2637 /* .include -- include a file at this point. */
2650 filename = demand_copy_string (&i);
2651 demand_empty_rest_of_line ();
2652 path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
2653 for (i = 0; i < include_dir_count; i++)
2655 strcpy (path, include_dirs[i]);
2657 strcat (path, filename);
2658 if (0 != (try = fopen (path, "r")))
2667 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2668 newbuf = input_scrub_include_file (path, input_line_pointer);
2669 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2673 add_include_dir (path)
2678 if (include_dir_count == 0)
2680 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2681 include_dirs[0] = "."; /* Current dir */
2682 include_dir_count = 2;
2686 include_dir_count++;
2687 include_dirs = (char **) realloc (include_dirs,
2688 include_dir_count * sizeof (*include_dirs));
2691 include_dirs[include_dir_count - 1] = path; /* New one */
2694 if (i > include_dir_maxlen)
2695 include_dir_maxlen = i;
2696 } /* add_include_dir() */
2702 while (!is_end_of_line[(unsigned char) *input_line_pointer])
2704 ++input_line_pointer;
2706 ++input_line_pointer;