1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
22 change this a bit. But then, GNU isn't
23 spozed to run on your machine anyway.
24 (RMS is so shortsighted sometimes.)
27 #define MASK_CHAR ((int)(unsigned char)-1)
31 /* This is the largest known floating point format (for now). It will
32 grow when we do 4361 style flonums. */
34 #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
36 /* Routines that read assembler source text to build spagetti in memory.
37 Another group of these functions is in the expr.c module. */
51 #ifndef TC_START_LABEL
52 #define TC_START_LABEL(x,y) (x==':')
55 /* The NOP_OPCODE is for the alignment fill value.
56 * fill it a nop instruction so that the disassembler does not choke
60 #define NOP_OPCODE 0x00
63 char *input_line_pointer
; /*->next char of source file to parse. */
65 #if BITS_PER_CHAR != 8
66 /* The following table is indexed by[(char)] and will break if
67 a char does not have exactly 256 states (hopefully 0:255!)! */
72 /* The m88k unfortunately uses @ as a label beginner. */
76 /* used by is_... macros. our ctype[] */
77 const char lex_type
[256] =
79 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
80 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
81 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
82 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
83 LEX_AT
, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
84 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
85 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
86 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
87 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
91 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
92 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
99 * Out: 1 if this character ends a line.
102 char is_end_of_line
[256] =
105 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, 99, _
, _
, 99, _
, _
, /* @abcdefghijklmno */
107 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, 99, _
, _
, _
, _
, _
, /* @abcdefghijklmno */
109 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
111 _
,99, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* _!"#$%&'()*+,-./ */
112 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* 0123456789:;<=>? */
114 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
115 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, 99, _
, _
, _
, _
, /* 0123456789:;<=>? */
117 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
118 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
119 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
120 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
121 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
122 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
123 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
124 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
125 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
129 /* Functions private to this file. */
131 static char *buffer
; /* 1st char of each buffer of lines is here. */
132 static char *buffer_limit
; /*->1 + last char in buffer. */
134 static char *bignum_low
; /* Lowest char of bignum. */
135 static char *bignum_limit
; /* 1st illegal address of bignum. */
136 static char *bignum_high
; /* Highest char of bignum. */
137 /* May point to (bignum_start-1). */
138 /* Never >= bignum_limit. */
140 int target_big_endian
;
142 static char *old_buffer
; /* JF a hack */
143 static char *old_input
;
144 static char *old_limit
;
146 /* Variables for handling include file directory list. */
148 char **include_dirs
; /* List of pointers to directories to
149 search for .include's */
150 int include_dir_count
; /* How many are in the list */
151 int include_dir_maxlen
= 1;/* Length of longest in list */
153 #ifndef WORKING_DOT_WORD
154 struct broken_word
*broken_words
;
155 int new_broken_words
;
158 static char *demand_copy_string
PARAMS ((int *lenP
));
159 int is_it_end_of_statement
PARAMS ((void));
160 unsigned int next_char_of_string
PARAMS ((void));
161 static segT get_known_segmented_expression
PARAMS ((expressionS
* expP
));
162 static void grow_bignum
PARAMS ((void));
163 static void pobegin
PARAMS ((void));
174 obj_read_begin_hook ();
176 obstack_begin (¬es
, 5000);
177 obstack_begin (&cond_obstack
, 960);
179 #define BIGNUM_BEGIN_SIZE (16)
180 bignum_low
= xmalloc ((long) BIGNUM_BEGIN_SIZE
);
181 bignum_limit
= bignum_low
+ BIGNUM_BEGIN_SIZE
;
183 /* Use machine dependent syntax */
184 for (p
= line_separator_chars
; *p
; p
++)
185 is_end_of_line
[*p
] = 1;
186 /* Use more. FIXME-SOMEDAY. */
189 /* set up pseudo-op tables */
191 struct hash_control
*po_hash
;
193 static const pseudo_typeS potable
[] =
195 {"abort", s_abort
, 0},
196 {"align", s_align_ptwo
, 0},
197 {"ascii", stringer
, 0},
198 {"asciz", stringer
, 1},
204 {"double", float_cons
, 'd'},
206 {"eject", listing_eject
, 0}, /* Formfeed listing */
209 {"endif", s_endif
, 0},
214 {"extern", s_ignore
, 0}, /* We treat all undef as ext */
215 {"appfile", s_app_file
, 1},
216 {"appline", s_app_line
, 0},
217 {"file", s_app_file
, 0},
219 {"float", float_cons
, 'f'},
220 {"global", s_globl
, 0},
221 {"globl", s_globl
, 0},
224 {"ifdef", s_ifdef
, 0},
225 {"ifeqs", s_ifeqs
, 0},
226 {"ifndef", s_ifdef
, 1},
227 {"ifnes", s_ifeqs
, 1},
228 {"ifnotdef", s_ifdef
, 1},
229 {"include", s_include
, 0},
231 {"lcomm", s_lcomm
, 0},
232 {"lflags", listing_flags
, 0}, /* Listing flags */
233 {"list", listing_list
, 1}, /* Turn listing on */
236 {"nolist", listing_list
, 0}, /* Turn listing off */
237 {"octa", big_cons
, 16},
239 {"psize", listing_psize
, 0}, /* set paper size */
241 {"quad", big_cons
, 8},
242 {"sbttl", listing_title
, 1}, /* Subtitle of listing */
247 {"single", float_cons
, 'f'},
249 {"space", s_space
, 0},
252 {"title", listing_title
, 0}, /* Listing title */
257 {NULL
} /* end sentinel */
263 char *errtxt
; /* error text */
264 const pseudo_typeS
*pop
;
266 po_hash
= hash_new ();
268 /* Do the target-specific pseudo ops. */
269 for (pop
= md_pseudo_table
; pop
->poc_name
; pop
++)
271 errtxt
= hash_insert (po_hash
, pop
->poc_name
, (char *) pop
);
272 if (errtxt
&& *errtxt
)
274 as_fatal ("error constructing md pseudo-op table");
278 /* Now object specific. Skip any that were in the target table. */
279 for (pop
= obj_pseudo_table
; pop
->poc_name
; pop
++)
281 errtxt
= hash_insert (po_hash
, pop
->poc_name
, (char *) pop
);
282 if (errtxt
&& *errtxt
)
284 if (!strcmp (errtxt
, "exists"))
286 #ifdef DIE_ON_OVERRIDES
287 as_fatal ("pseudo op \".%s\" overridden.\n", pop
->poc_name
);
288 #endif /* DIE_ON_OVERRIDES */
289 continue; /* OK if target table overrides. */
293 as_fatal ("error constructing obj pseudo-op table");
294 } /* if overridden */
298 /* Now portable ones. Skip any that we've seen already. */
299 for (pop
= potable
; pop
->poc_name
; pop
++)
301 errtxt
= hash_insert (po_hash
, pop
->poc_name
, (char *) pop
);
302 if (errtxt
&& *errtxt
)
304 if (!strcmp (errtxt
, "exists"))
306 #ifdef DIE_ON_OVERRIDES
307 as_fatal ("pseudo op \".%s\" overridden.\n", pop
->poc_name
);
308 #endif /* DIE_ON_OVERRIDES */
309 continue; /* OK if target table overrides. */
313 as_fatal ("error constructing obj pseudo-op table");
314 } /* if overridden */
321 #define HANDLE_CONDITIONAL_ASSEMBLY() \
322 if (ignore_input ()) \
324 while (! is_end_of_line[*input_line_pointer++]) \
325 if (input_line_pointer == buffer_limit) \
331 /* read_a_source_file()
333 * We read the file, putting things into a web that
334 * represents what we have been reading.
337 read_a_source_file (name
)
341 register char *s
; /* string of symbol, '\0' appended */
345 buffer
= input_scrub_new_file (name
);
348 listing_newline ("");
350 while ((buffer_limit
= input_scrub_next_buffer (&input_line_pointer
)) != 0)
351 { /* We have another line to parse. */
352 know (buffer_limit
[-1] == '\n'); /* Must have a sentinel. */
353 contin
: /* JF this goto is my fault I admit it.
354 Someone brave please re-write the whole
355 input section here? Pleeze??? */
356 while (input_line_pointer
< buffer_limit
)
358 /* We have more of this buffer to parse. */
361 * We now have input_line_pointer->1st char of next line.
362 * If input_line_pointer [-1] == '\n' then we just
363 * scanned another line: so bump line counters.
365 if (input_line_pointer
[-1] == '\n')
367 bump_line_counters ();
370 /* Text at the start of a line must be a label, we run down and stick a colon in */
371 if (is_name_beginner (*input_line_pointer
))
373 char *line_start
= input_line_pointer
;
374 char c
= get_symbol_end ();
376 *input_line_pointer
= c
;
378 input_line_pointer
++;
386 * We are at the begining of a line, or similar place.
387 * We expect a well-formed assembler statement.
388 * A "symbol-name:" is a statement.
390 * Depending on what compiler is used, the order of these tests
391 * may vary to catch most common case 1st.
392 * Each test is independent of all other tests at the (top) level.
393 * PLEASE make a compiler that doesn't use this assembler.
394 * It is crufty to waste a compiler's time encoding things for this
395 * assembler, which then wastes more time decoding it.
396 * (And communicating via (linear) files is silly!
397 * If you must pass stuff, please pass a tree!)
399 if ((c
= *input_line_pointer
++) == '\t'
404 c
= *input_line_pointer
++;
406 know (c
!= ' '); /* No further leading whitespace. */
409 * C is the 1st significant character.
410 * Input_line_pointer points after that character.
412 if (is_name_beginner (c
))
413 { /* want user-defined label or pseudo/opcode */
414 HANDLE_CONDITIONAL_ASSEMBLY ();
416 s
= --input_line_pointer
;
417 c
= get_symbol_end (); /* name's delimiter */
419 * C is character after symbol.
420 * That character's place in the input line is now '\0'.
421 * S points to the beginning of the symbol.
422 * [In case of pseudo-op, s->'.'.]
423 * Input_line_pointer->'\0' where c was.
425 if (TC_START_LABEL(c
, input_line_pointer
))
427 colon (s
); /* user-defined label */
428 *input_line_pointer
++ = ':'; /* Put ':' back for error messages' sake. */
429 /* Input_line_pointer->after ':'. */
434 else if (c
== '=' || input_line_pointer
[1] == '=')
437 demand_empty_rest_of_line ();
440 { /* expect pseudo-op or machine instruction */
442 if (!done_pseudo (s
))
450 * WARNING: c has next char, which may be end-of-line.
451 * We lookup the pseudo-op table with s+1 because we
452 * already know that the pseudo-op begins with a '.'.
455 pop
= (pseudo_typeS
*) hash_find (po_hash
, s
+ 1);
457 /* Print the error msg now, while we still can */
460 as_bad ("Unknown pseudo-op: `%s'", s
);
461 *input_line_pointer
= c
;
466 /* Put it back for error messages etc. */
467 *input_line_pointer
= c
;
468 /* The following skip of whitespace is compulsory.
469 A well shaped space is sometimes all that separates
470 keyword from operands. */
471 if (c
== ' ' || c
== '\t')
473 input_line_pointer
++;
474 } /* Skip seperator after keyword. */
476 * Input_line is restored.
477 * Input_line_pointer->1st non-blank char
478 * after pseudo-operation.
482 ignore_rest_of_line ();
487 (*pop
->poc_handler
) (pop
->poc_val
);
488 } /* if we have one */
492 { /* machine instruction */
493 /* WARNING: c has char, which may be end-of-line. */
494 /* Also: input_line_pointer->`\0` where c was. */
495 *input_line_pointer
= c
;
496 while (!is_end_of_line
[*input_line_pointer
])
498 input_line_pointer
++;
501 c
= *input_line_pointer
;
502 *input_line_pointer
= '\0';
504 md_assemble (s
); /* Assemble 1 instruction. */
506 *input_line_pointer
++ = c
;
508 /* We resume loop AFTER the end-of-line from this instruction */
513 } /* if (is_name_beginner(c) */
516 if (is_end_of_line
[c
])
519 } /* empty statement */
522 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
524 { /* local label ("4:") */
525 char *backup
= input_line_pointer
;
527 HANDLE_CONDITIONAL_ASSEMBLY ();
531 while (isdigit (*input_line_pointer
))
533 temp
= (temp
* 10) + *input_line_pointer
- '0';
534 ++input_line_pointer
;
535 } /* read the whole number */
537 #ifdef LOCAL_LABELS_DOLLAR
538 if (*input_line_pointer
== '$'
539 && *(input_line_pointer
+ 1) == ':')
541 input_line_pointer
+= 2;
543 if (dollar_label_defined (temp
))
545 as_fatal ("label \"%d$\" redefined", temp
);
548 define_dollar_label (temp
);
549 colon (dollar_label_name (temp
, 0));
552 #endif /* LOCAL_LABELS_DOLLAR */
554 #ifdef LOCAL_LABELS_FB
555 if (*input_line_pointer
++ == ':')
557 fb_label_instance_inc (temp
);
558 colon (fb_label_name (temp
, 0));
561 #endif /* LOCAL_LABELS_FB */
563 input_line_pointer
= backup
;
564 } /* local label ("4:") */
565 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
567 if (c
&& strchr (line_comment_chars
, c
))
568 { /* Its a comment. Better say APP or NO_APP */
574 extern char *scrub_string
, *scrub_last_string
;
576 bump_line_counters ();
577 s
= input_line_pointer
;
578 if (strncmp (s
, "APP\n", 4))
579 continue; /* We ignore it */
582 ends
= strstr (s
, "#NO_APP\n");
589 /* The end of the #APP wasn't in this buffer. We
590 keep reading in buffers until we find the #NO_APP
591 that goes with this #APP There is one. The specs
593 tmp_len
= buffer_limit
- s
;
594 tmp_buf
= xmalloc (tmp_len
+ 1);
595 bcopy (s
, tmp_buf
, tmp_len
);
598 new_tmp
= input_scrub_next_buffer (&buffer
);
602 buffer_limit
= new_tmp
;
603 input_line_pointer
= buffer
;
604 ends
= strstr (buffer
, "#NO_APP\n");
608 num
= buffer_limit
- buffer
;
610 tmp_buf
= xrealloc (tmp_buf
, tmp_len
+ num
);
611 bcopy (buffer
, tmp_buf
+ tmp_len
, num
);
616 input_line_pointer
= ends
? ends
+ 8 : NULL
;
624 input_line_pointer
= ends
+ 8;
626 new_buf
= xmalloc (100);
631 scrub_last_string
= ends
;
636 ch
= do_scrub_next_char (scrub_from_string
, scrub_to_string
);
640 if (new_tmp
== new_buf
+ new_length
)
642 new_buf
= xrealloc (new_buf
, new_length
+ 100);
643 new_tmp
= new_buf
+ new_length
;
651 old_input
= input_line_pointer
;
652 old_limit
= buffer_limit
;
654 input_line_pointer
= new_buf
;
655 buffer_limit
= new_tmp
;
659 HANDLE_CONDITIONAL_ASSEMBLY ();
661 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
662 input_line_pointer
--; /* Report unknown char as ignored. */
663 ignore_rest_of_line ();
664 } /* while (input_line_pointer<buffer_limit) */
667 bump_line_counters ();
671 input_line_pointer
= old_input
;
672 buffer_limit
= old_limit
;
677 } /* while (more buffers to scan) */
678 input_scrub_close (); /* Close the input file */
680 } /* read_a_source_file() */
685 as_fatal (".abort detected. Abandoning ship.");
688 /* For machines where ".align 4" means align to a 4 byte boundary. */
693 register unsigned int temp
;
694 register long temp_fill
;
696 unsigned long max_alignment
= 1 << 15;
698 if (is_end_of_line
[*input_line_pointer
])
699 temp
= arg
; /* Default value from pseudo-op table */
701 temp
= get_absolute_expression ();
703 if (temp
> max_alignment
)
705 as_bad ("Alignment too large: %d. assumed.", temp
= max_alignment
);
709 * For the sparc, `.align (1<<n)' actually means `.align n'
710 * so we have to convert it.
714 for (i
= 0; (temp
& 1) == 0; temp
>>= 1, ++i
)
718 as_bad ("Alignment not a power of 2");
721 if (*input_line_pointer
== ',')
723 input_line_pointer
++;
724 temp_fill
= get_absolute_expression ();
726 else if (now_seg
!= data_section
&& now_seg
!= bss_section
)
727 temp_fill
= NOP_OPCODE
;
730 /* Only make a frag if we HAVE to. . . */
731 if (temp
&& !need_pass_2
)
732 frag_align (temp
, (int) temp_fill
);
734 record_alignment (now_seg
, temp
);
736 demand_empty_rest_of_line ();
737 } /* s_align_bytes() */
739 /* For machines where ".align 4" means align to 2**4 boundary. */
744 register long temp_fill
;
745 long max_alignment
= 15;
747 temp
= get_absolute_expression ();
748 if (temp
> max_alignment
)
749 as_bad ("Alignment too large: %d. assumed.", temp
= max_alignment
);
752 as_bad ("Alignment negative. 0 assumed.");
755 if (*input_line_pointer
== ',')
757 input_line_pointer
++;
758 temp_fill
= get_absolute_expression ();
760 /* @@ Fix this right for BFD! */
761 else if (now_seg
!= data_section
&& now_seg
!= bss_section
)
762 temp_fill
= NOP_OPCODE
;
765 /* Only make a frag if we HAVE to. . . */
766 if (temp
&& !need_pass_2
)
767 frag_align (temp
, (int) temp_fill
);
769 record_alignment (now_seg
, temp
);
771 demand_empty_rest_of_line ();
772 } /* s_align_ptwo() */
781 register symbolS
*symbolP
;
783 name
= input_line_pointer
;
784 c
= get_symbol_end ();
785 /* just after name is now '\0' */
786 p
= input_line_pointer
;
789 if (*input_line_pointer
!= ',')
791 as_bad ("Expected comma after symbol-name: rest of line ignored.");
792 ignore_rest_of_line ();
795 input_line_pointer
++; /* skip ',' */
796 if ((temp
= get_absolute_expression ()) < 0)
798 as_warn (".COMMon length (%d.) <0! Ignored.", temp
);
799 ignore_rest_of_line ();
803 symbolP
= symbol_find_or_make (name
);
805 if (S_IS_DEFINED (symbolP
))
807 as_bad ("Ignoring attempt to re-define symbol");
808 ignore_rest_of_line ();
811 if (S_GET_VALUE (symbolP
))
813 if (S_GET_VALUE (symbolP
) != temp
)
814 as_bad ("Length of .comm \"%s\" is already %d. Not changed to %d.",
815 S_GET_NAME (symbolP
),
816 S_GET_VALUE (symbolP
),
821 S_SET_VALUE (symbolP
, temp
);
822 S_SET_EXTERNAL (symbolP
);
825 if ( (!temp
) || !flagseen
['1'])
826 S_GET_OTHER(symbolP
) = const_flag
;
827 #endif /* not OBJ_VMS */
828 know (symbolP
->sy_frag
== &zero_address_frag
);
829 demand_empty_rest_of_line ();
838 temp
= get_absolute_expression ();
841 section
= text_section
;
845 section
= data_section
;
848 subseg_set (section
, (subsegT
) temp
);
850 subseg_new (section
, (subsegT
) temp
);
856 demand_empty_rest_of_line ();
859 /* Handle the .appfile pseudo-op. This is automatically generated by
860 do_scrub_next_char when a preprocessor # line comment is seen with
861 a file name. This default definition may be overridden by the
862 object or CPU specific pseudo-ops. This function is also the
863 default definition for .file; the APPFILE argument is 1 for
864 .appfile, 0 for .file. */
873 /* Some assemblers tolerate immediately following '"' */
874 if ((s
= demand_copy_string (&length
)) != 0)
876 /* If this is a fake .appfile, a fake newline was inserted into
877 the buffer. Passing -2 to new_logical_line tells it to
879 new_logical_line (s
, appfile
? -2 : -1);
880 demand_empty_rest_of_line ();
883 listing_source_file (s
);
887 c_dot_file_symbol (s
);
888 #endif /* OBJ_COFF */
894 /* Handle the .appline pseudo-op. This is automatically generated by
895 do_scrub_next_char when a preprocessor # line comment is seen.
896 This default definition may be overridden by the object or CPU
897 specific pseudo-ops. */
904 /* The given number is that of the next line. */
905 l
= get_absolute_expression () - 1;
906 new_logical_line ((char *) NULL
, l
);
909 listing_source_line (l
);
911 demand_empty_rest_of_line ();
917 long temp_repeat
= 0;
919 register long temp_fill
= 0;
923 temp_repeat
= get_absolute_expression ();
924 if (*input_line_pointer
== ',')
926 input_line_pointer
++;
927 temp_size
= get_absolute_expression ();
928 if (*input_line_pointer
== ',')
930 input_line_pointer
++;
931 temp_fill
= get_absolute_expression ();
934 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
935 #define BSD_FILL_SIZE_CROCK_8 (8)
936 if (temp_size
> BSD_FILL_SIZE_CROCK_8
)
938 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8
);
939 temp_size
= BSD_FILL_SIZE_CROCK_8
;
943 as_warn ("Size negative: .fill ignored.");
946 else if (temp_repeat
<= 0)
948 as_warn ("Repeat < 0, .fill ignored");
952 if (temp_size
&& !need_pass_2
)
954 p
= frag_var (rs_fill
, (int) temp_size
, (int) temp_size
, (relax_substateT
) 0, (symbolS
*) 0, temp_repeat
, (char *) 0);
955 memset (p
, 0, (int) temp_size
);
956 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
957 * flavoured AS. The following bizzare behaviour is to be
958 * compatible with above. I guess they tried to take up to 8
959 * bytes from a 4-byte expression and they forgot to sign
960 * extend. Un*x Sux. */
961 #define BSD_FILL_SIZE_CROCK_4 (4)
962 md_number_to_chars (p
, temp_fill
,
963 (temp_size
> BSD_FILL_SIZE_CROCK_4
964 ? BSD_FILL_SIZE_CROCK_4
966 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
967 * but emits no error message because it seems a legal thing to do.
968 * It is a degenerate case of .fill but could be emitted by a compiler.
971 demand_empty_rest_of_line ();
983 name
= input_line_pointer
;
984 c
= get_symbol_end ();
985 symbolP
= symbol_find_or_make (name
);
986 *input_line_pointer
= c
;
988 S_SET_EXTERNAL (symbolP
);
991 input_line_pointer
++;
993 if (*input_line_pointer
== '\n')
998 demand_empty_rest_of_line ();
1002 s_lcomm (needs_align
)
1003 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1004 (alignment); 0 if it was an ".lcomm" (2 args only) */
1007 register char *name
;
1011 register symbolS
*symbolP
;
1012 segT current_seg
= now_seg
;
1013 subsegT current_subseg
= now_subseg
;
1014 const int max_alignment
= 15;
1016 segT bss_seg
= bss_section
;
1018 name
= input_line_pointer
;
1019 c
= get_symbol_end ();
1020 p
= input_line_pointer
;
1023 if (*input_line_pointer
!= ',')
1025 as_bad ("Expected comma after name");
1026 ignore_rest_of_line ();
1030 ++input_line_pointer
;
1032 if (*input_line_pointer
== '\n')
1034 as_bad ("Missing size expression");
1038 if ((temp
= get_absolute_expression ()) < 0)
1040 as_warn ("BSS length (%d.) <0! Ignored.", temp
);
1041 ignore_rest_of_line ();
1047 /* For MIPS ECOFF, small objects are put in .sbss. */
1048 if (temp
<= bfd_get_gp_size (stdoutput
))
1049 bss_seg
= subseg_new (".sbss", 1);
1057 if (*input_line_pointer
!= ',')
1059 as_bad ("Expected comma after size");
1060 ignore_rest_of_line ();
1063 input_line_pointer
++;
1065 if (*input_line_pointer
== '\n')
1067 as_bad ("Missing alignment");
1070 align
= get_absolute_expression ();
1071 if (align
> max_alignment
)
1073 align
= max_alignment
;
1074 as_warn ("Alignment too large: %d. assumed.", align
);
1079 as_warn ("Alignment negative. 0 assumed.");
1081 record_alignment (bss_seg
, align
);
1082 } /* if needs align */
1085 symbolP
= symbol_find_or_make (name
);
1089 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1090 S_GET_OTHER (symbolP
) == 0 &&
1091 S_GET_DESC (symbolP
) == 0 &&
1092 #endif /* OBJ_AOUT or OBJ_BOUT */
1093 (S_GET_SEGMENT (symbolP
) == bss_seg
1094 || (!S_IS_DEFINED (symbolP
) && S_GET_VALUE (symbolP
) == 0)))
1098 #ifdef BFD_ASSEMBLER
1099 subseg_set (bss_seg
, 1);
1101 subseg_new (bss_seg
, 1);
1105 frag_align (align
, 0);
1106 /* detach from old frag */
1107 if (S_GET_SEGMENT (symbolP
) == bss_seg
)
1108 symbolP
->sy_frag
->fr_symbol
= NULL
;
1110 symbolP
->sy_frag
= frag_now
;
1111 p
= frag_var (rs_org
, 1, 1, (relax_substateT
)0, symbolP
,
1115 S_SET_SEGMENT (symbolP
, bss_seg
);
1118 /* The symbol may already have been created with a preceding
1119 ".globl" directive -- be careful not to step on storage class
1120 in that case. Otherwise, set it to static. */
1121 if (S_GET_STORAGE_CLASS (symbolP
) != C_EXT
)
1123 S_SET_STORAGE_CLASS (symbolP
, C_STAT
);
1125 #endif /* OBJ_COFF */
1129 as_bad ("Ignoring attempt to re-define symbol %s.", name
);
1132 #ifdef BFD_ASSEMBLER
1133 subseg_set (current_seg
, current_subseg
);
1135 subseg_new (current_seg
, current_subseg
);
1138 demand_empty_rest_of_line ();
1156 register char *name
;
1159 register segT segment
;
1161 register symbolS
*symbolP
;
1163 /* we permit ANY defined expression: BSD4.2 demands constants */
1164 name
= input_line_pointer
;
1165 c
= get_symbol_end ();
1166 p
= input_line_pointer
;
1169 if (*input_line_pointer
!= ',')
1172 as_bad ("Expected comma after name \"%s\"", name
);
1174 ignore_rest_of_line ();
1177 input_line_pointer
++;
1178 segment
= expression (&exp
);
1179 if (segment
!= absolute_section
1180 && segment
!= reg_section
1181 && ! SEG_NORMAL (segment
))
1183 as_bad ("Bad expression: %s", segment_name (segment
));
1184 ignore_rest_of_line ();
1188 symbolP
= symbol_find_or_make (name
);
1190 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1191 symbolP->sy_desc == 0) out of this test because coff doesn't have
1192 those fields, and I can't see when they'd ever be tripped. I
1193 don't think I understand why they were here so I may have
1194 introduced a bug. As recently as 1.37 didn't have this test
1195 anyway. xoxorich. */
1197 if (S_GET_SEGMENT (symbolP
) == undefined_section
1198 && S_GET_VALUE (symbolP
) == 0)
1200 /* The name might be an undefined .global symbol; be sure to
1201 keep the "external" bit. */
1202 S_SET_SEGMENT (symbolP
, segment
);
1203 S_SET_VALUE (symbolP
, (valueT
) (exp
.X_add_number
));
1207 as_bad ("Symbol %s already defined", name
);
1210 demand_empty_rest_of_line ();
1216 register segT segment
;
1218 register long temp_fill
;
1220 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1221 thing as a sub-segment-relative origin. Any absolute origin is
1222 given a warning, then assumed to be segment-relative. Any
1223 segmented origin expression ("foo+42") had better be in the right
1224 segment or the .org is ignored.
1226 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1227 we never know sub-segment sizes when we are reading code. BSD
1228 will crash trying to emit negative numbers of filler bytes in
1229 certain .orgs. We don't crash, but see as-write for that code.
1231 Don't make frag if need_pass_2==1. */
1232 segment
= get_known_segmented_expression (&exp
);
1233 if (*input_line_pointer
== ',')
1235 input_line_pointer
++;
1236 temp_fill
= get_absolute_expression ();
1242 if (segment
!= now_seg
&& segment
!= absolute_section
)
1243 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1244 segment_name (segment
), segment_name (now_seg
));
1245 p
= frag_var (rs_org
, 1, 1, (relax_substateT
) 0, exp
.X_add_symbol
,
1246 exp
.X_add_number
, (char *) 0);
1248 } /* if (ok to make frag) */
1249 demand_empty_rest_of_line ();
1255 register char *name
;
1256 register char delim
;
1257 register char *end_name
;
1258 register symbolS
*symbolP
;
1261 * Especial apologies for the random logic:
1262 * this just grew, and could be parsed much more simply!
1265 name
= input_line_pointer
;
1266 delim
= get_symbol_end ();
1267 end_name
= input_line_pointer
;
1271 if (*input_line_pointer
!= ',')
1274 as_bad ("Expected comma after name \"%s\"", name
);
1276 ignore_rest_of_line ();
1280 input_line_pointer
++;
1283 if (name
[0] == '.' && name
[1] == '\0')
1285 /* Turn '. = mumble' into a .org mumble */
1286 register segT segment
;
1290 segment
= get_known_segmented_expression (&exp
);
1294 if (segment
!= now_seg
&& segment
!= absolute_section
)
1295 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1296 segment_name (segment
),
1297 segment_name (now_seg
));
1298 ptr
= frag_var (rs_org
, 1, 1, (relax_substateT
) 0, exp
.X_add_symbol
,
1299 exp
.X_add_number
, (char *) 0);
1301 } /* if (ok to make frag) */
1307 if ((symbolP
= symbol_find (name
)) == NULL
1308 && (symbolP
= md_undefined_symbol (name
)) == NULL
)
1310 symbolP
= symbol_new (name
, undefined_section
, 0, &zero_address_frag
);
1312 /* "set" symbols are local unless otherwise specified. */
1313 SF_SET_LOCAL (symbolP
);
1314 #endif /* OBJ_COFF */
1316 } /* make a new symbol */
1318 symbol_table_insert (symbolP
);
1321 pseudo_set (symbolP
);
1322 demand_empty_rest_of_line ();
1330 register long temp_fill
;
1333 /* Just like .fill, but temp_size = 1 */
1334 if (get_absolute_expression_and_terminator (&temp_repeat
) == ',')
1336 temp_fill
= get_absolute_expression ();
1340 input_line_pointer
--; /* Backup over what was not a ','. */
1345 temp_repeat
*= mult
;
1347 if (temp_repeat
<= 0)
1349 as_warn ("Repeat < 0, .space ignored");
1350 ignore_rest_of_line ();
1355 p
= frag_var (rs_fill
, 1, 1, (relax_substateT
) 0, (symbolS
*) 0,
1356 temp_repeat
, (char *) 0);
1359 demand_empty_rest_of_line ();
1367 temp
= get_absolute_expression ();
1368 #ifdef BFD_ASSEMBLER
1369 subseg_set (text_section
, (subsegT
) temp
);
1371 subseg_new (text_section
, (subsegT
) temp
);
1373 demand_empty_rest_of_line ();
1378 demand_empty_rest_of_line ()
1381 if (is_end_of_line
[*input_line_pointer
])
1383 input_line_pointer
++;
1387 ignore_rest_of_line ();
1389 /* Return having already swallowed end-of-line. */
1390 } /* Return pointing just after end-of-line. */
1393 ignore_rest_of_line () /* For suspect lines: gives warning. */
1395 if (!is_end_of_line
[*input_line_pointer
])
1397 if (isprint (*input_line_pointer
))
1398 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1399 *input_line_pointer
);
1401 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1402 *input_line_pointer
);
1403 while (input_line_pointer
< buffer_limit
1404 && !is_end_of_line
[*input_line_pointer
])
1406 input_line_pointer
++;
1409 input_line_pointer
++; /* Return pointing just after end-of-line. */
1410 know (is_end_of_line
[input_line_pointer
[-1]]);
1416 * In: Pointer to a symbol.
1417 * Input_line_pointer->expression.
1419 * Out: Input_line_pointer->just after any whitespace after expression.
1420 * Tried to set symbol to value of expression.
1421 * Will change symbols type, value, and frag;
1422 * May set need_pass_2 == 1.
1425 pseudo_set (symbolP
)
1429 register segT segment
;
1430 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1432 #endif /* OBJ_AOUT or OBJ_BOUT */
1434 know (symbolP
); /* NULL pointer is logic error. */
1435 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1436 /* @@ Fix this right for BFD. */
1437 ext
= S_IS_EXTERNAL (symbolP
);
1438 #endif /* OBJ_AOUT or OBJ_BOUT */
1440 if ((segment
= expression (&exp
)) == absent_section
)
1442 as_bad ("Missing expression: absolute 0 assumed");
1443 exp
.X_seg
= absolute_section
;
1444 exp
.X_add_number
= 0;
1447 if (segment
== reg_section
)
1449 S_SET_SEGMENT (symbolP
, reg_section
);
1450 S_SET_VALUE (symbolP
, exp
.X_add_number
);
1451 symbolP
->sy_frag
= &zero_address_frag
;
1453 else if (segment
== big_section
)
1455 as_bad ("%s number invalid. Absolute 0 assumed.",
1456 exp
.X_add_number
> 0 ? "Bignum" : "Floating-Point");
1457 S_SET_SEGMENT (symbolP
, absolute_section
);
1458 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1459 /* @@ Fix this right for BFD. */
1460 ext
? S_SET_EXTERNAL (symbolP
) :
1461 S_CLEAR_EXTERNAL (symbolP
);
1462 #endif /* OBJ_AOUT or OBJ_BOUT */
1463 S_SET_VALUE (symbolP
, 0);
1464 symbolP
->sy_frag
= &zero_address_frag
;
1466 else if (segment
== absent_section
)
1468 as_warn ("No expression: Using absolute 0");
1469 S_SET_SEGMENT (symbolP
, absolute_section
);
1470 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1471 /* @@ Fix this right for BFD. */
1472 ext
? S_SET_EXTERNAL (symbolP
) :
1473 S_CLEAR_EXTERNAL (symbolP
);
1474 #endif /* OBJ_AOUT or OBJ_BOUT */
1475 S_SET_VALUE (symbolP
, 0);
1476 symbolP
->sy_frag
= &zero_address_frag
;
1478 else if (segment
== diff_section
)
1480 if (exp
.X_add_symbol
&& exp
.X_subtract_symbol
1481 && (S_GET_SEGMENT (exp
.X_add_symbol
) ==
1482 S_GET_SEGMENT (exp
.X_subtract_symbol
)))
1484 if (exp
.X_add_symbol
->sy_frag
== exp
.X_subtract_symbol
->sy_frag
)
1486 exp
.X_add_number
+= S_GET_VALUE (exp
.X_add_symbol
) -
1487 S_GET_VALUE (exp
.X_subtract_symbol
);
1490 symbolP
->sy_value
= exp
;
1494 as_bad ("Complex expression. Absolute segment assumed.");
1498 else if (segment
== absolute_section
)
1501 S_SET_SEGMENT (symbolP
, absolute_section
);
1502 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1503 /* @@ Fix this right for BFD. */
1504 ext
? S_SET_EXTERNAL (symbolP
) :
1505 S_CLEAR_EXTERNAL (symbolP
);
1506 #endif /* OBJ_AOUT or OBJ_BOUT */
1507 S_SET_VALUE (symbolP
, exp
.X_add_number
);
1508 symbolP
->sy_frag
= &zero_address_frag
;
1510 else if (segment
== pass1_section
)
1512 symbolP
->sy_value
.X_add_symbol
= exp
.X_add_symbol
;
1513 symbolP
->sy_value
.X_subtract_symbol
= NULL
;
1514 symbolP
->sy_value
.X_add_number
= 0;
1515 symbolP
->sy_value
.X_seg
= undefined_section
;
1516 as_bad ("Unknown expression");
1517 know (need_pass_2
== 1);
1519 else if (segment
== undefined_section
)
1521 symbolP
->sy_value
.X_add_symbol
= exp
.X_add_symbol
;
1522 symbolP
->sy_value
.X_subtract_symbol
= NULL
;
1523 symbolP
->sy_value
.X_add_number
= 0;
1524 symbolP
->sy_value
.X_seg
= undefined_section
;
1528 #ifndef BFD_ASSEMBLER
1529 #ifndef MANY_SEGMENTS
1538 as_fatal ("failed sanity check.");
1539 } /* switch on segment */
1542 S_SET_SEGMENT (symbolP
, segment
);
1543 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1544 /* @@ Fix this right for BFD! */
1547 S_SET_EXTERNAL (symbolP
);
1551 S_CLEAR_EXTERNAL (symbolP
);
1553 #endif /* OBJ_AOUT or OBJ_BOUT */
1555 S_SET_VALUE (symbolP
, exp
.X_add_number
+ S_GET_VALUE (exp
.X_add_symbol
));
1556 symbolP
->sy_frag
= exp
.X_add_symbol
->sy_frag
;
1563 * CONStruct more frag of .bytes, or .words etc.
1564 * Should need_pass_2 be 1 then emit no frag(s).
1565 * This understands EXPRESSIONS, as opposed to big_cons().
1569 * This has a split personality. We use expression() to read the
1570 * value. We can detect if the value won't fit in a byte or word.
1571 * But we can't detect if expression() discarded significant digits
1572 * in the case of a long. Not worth the crocks required to fix it.
1575 /* Select a parser for cons expressions. */
1577 /* Some targets need to parse the expression in various fancy ways.
1578 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1579 (for example, the HPPA does this). Otherwise, you can define
1580 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1581 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1582 are defined, which is the normal case, then only simple expressions
1585 #ifndef TC_PARSE_CONS_EXPRESSION
1586 #ifdef BITFIELD_CONS_EXPRESSIONS
1587 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1589 parse_bitfield_cons
PARAMS ((expressionS
*exp
, unsigned int nbytes
));
1592 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1594 parse_mri_cons
PARAMS ((expressionS
*exp
));
1596 #ifdef REPEAT_CONS_EXPRESSIONS
1597 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1599 parse_repeat_cons
PARAMS ((expressionS
*exp
, unsigned int nbytes
));
1602 /* If we haven't gotten one yet, just call expression. */
1603 #ifndef TC_PARSE_CONS_EXPRESSION
1604 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1608 /* worker to do .byte etc statements */
1609 /* clobbers input_line_pointer, checks */
1613 register unsigned int nbytes
; /* 1=.byte, 2=.word, 4=.long */
1617 if (is_it_end_of_statement ())
1619 demand_empty_rest_of_line ();
1625 TC_PARSE_CONS_EXPRESSION (&exp
, nbytes
);
1626 emit_expr (&exp
, nbytes
);
1628 while (*input_line_pointer
++ == ',');
1630 input_line_pointer
--; /* Put terminator back into stream. */
1631 demand_empty_rest_of_line ();
1634 /* Put the contents of expression EXP into the object file using
1635 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1638 emit_expr (exp
, nbytes
)
1640 unsigned int nbytes
;
1645 /* Don't do anything if we are going to make another pass. */
1649 segment
= exp
->X_seg
;
1651 /* Don't call this if we are going to junk this pass anyway! */
1652 know (segment
!= pass1_section
);
1654 if (segment
== diff_section
&& exp
->X_add_symbol
== NULL
)
1656 as_bad ("Subtracting symbol \"%s\" (segment \"%s\") is too hard. Absolute segment assumed.",
1657 S_GET_NAME (exp
->X_subtract_symbol
),
1658 segment_name (S_GET_SEGMENT (exp
->X_subtract_symbol
)));
1659 segment
= absolute_section
;
1660 /* Leave exp->X_add_number alone. */
1662 else if (segment
== absent_section
)
1664 as_warn ("0 assumed for missing expression");
1665 exp
->X_add_number
= 0;
1666 know (exp
->X_add_symbol
== NULL
);
1667 segment
= absolute_section
;
1669 else if (segment
== big_section
)
1671 as_bad ("%s number invalid. Absolute 0 assumed.",
1672 exp
->X_add_number
> 0 ? "Bignum" : "Floating-Point");
1673 exp
->X_add_number
= 0;
1674 segment
= absolute_section
;
1677 p
= frag_more (nbytes
);
1679 #ifndef WORKING_DOT_WORD
1680 /* If we have the difference of two symbols in a word, save it on
1681 the broken_words list. See the code in write.c. */
1682 if (segment
== diff_section
&& nbytes
== 2)
1684 struct broken_word
*x
;
1686 x
= (struct broken_word
*) xmalloc (sizeof (struct broken_word
));
1687 x
->next_broken_word
= broken_words
;
1690 x
->word_goes_here
= p
;
1692 x
->add
= exp
->X_add_symbol
;
1693 x
->sub
= exp
->X_subtract_symbol
;
1694 x
->addnum
= exp
->X_add_number
;
1701 if (segment
== absolute_section
)
1706 register long unmask
;
1708 /* JF << of >= number of bits in the object is undefined. In
1709 particular SPARC (Sun 4) has problems */
1710 if (nbytes
>= sizeof (long))
1713 mask
= ~0 << (BITS_PER_CHAR
* nbytes
); /* Don't store these bits. */
1715 unmask
= ~mask
; /* Do store these bits. */
1718 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1719 mask
= ~(unmask
>> 1); /* Includes sign bit now. */
1722 get
= exp
->X_add_number
;
1724 if ((get
& mask
) != 0 && (get
& mask
) != mask
)
1725 { /* Leading bits contain both 0s & 1s. */
1726 as_warn ("Value 0x%x truncated to 0x%x.", get
, use
);
1728 md_number_to_chars (p
, use
, nbytes
); /* put bytes in right order. */
1732 md_number_to_chars (p
, (long) 0, nbytes
);
1734 /* Now we need to generate a fixS to record the symbol value.
1735 This is easy for BFD. For other targets it can be more
1736 complex. For very complex cases (currently, the HPPA and
1737 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1738 want. For simpler cases, you can define TC_CONS_RELOC to be
1739 the name of the reloc code that should be stored in the fixS.
1740 If neither is defined, the code uses NO_RELOC if it is
1741 defined, and otherwise uses 0. */
1743 #ifdef BFD_ASSEMBLER
1744 fix_new (frag_now
, p
- frag_now
->fr_literal
, nbytes
,
1745 exp
->X_add_symbol
, exp
->X_subtract_symbol
,
1746 exp
->X_add_number
, 0,
1747 /* @@ Should look at CPU word size. */
1750 #ifdef TC_CONS_FIX_NEW
1751 TC_CONS_FIX_NEW (frag_now
, p
- frag_now
->fr_literal
, nbytes
, exp
);
1753 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1754 it is defined, otherwise use NO_RELOC if it is defined,
1756 #ifndef TC_CONS_RELOC
1758 #define TC_CONS_RELOC NO_RELOC
1760 #define TC_CONS_RELOC 0
1763 fix_new (frag_now
, p
- frag_now
->fr_literal
, nbytes
,
1764 exp
->X_add_symbol
, exp
->X_subtract_symbol
,
1765 exp
->X_add_number
, 0, TC_CONS_RELOC
);
1766 #endif /* TC_CONS_FIX_NEW */
1767 #endif /* BFD_ASSEMBLER */
1771 #ifdef BITFIELD_CONS_EXPRESSIONS
1773 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1774 w:x,y:z, where w and y are bitwidths and x and y are values. They
1775 then pack them all together. We do a little better in that we allow
1776 them in words, longs, etc. and we'll pack them in target byte order
1779 The rules are: pack least significat bit first, if a field doesn't
1780 entirely fit, put it in the next unit. Overflowing the bitfield is
1781 explicitly *not* even a warning. The bitwidth should be considered
1784 To use this function the tc-XXX.h file should define
1785 BITFIELD_CONS_EXPRESSIONS. */
1788 parse_bitfield_cons (exp
, nbytes
)
1790 unsigned int nbytes
;
1792 unsigned int bits_available
= BITS_PER_CHAR
* nbytes
;
1793 char *hold
= input_line_pointer
;
1796 segment
= expression (exp
);
1798 if (*input_line_pointer
== ':')
1804 unsigned long width
;
1806 if (*input_line_pointer
!= ':')
1808 input_line_pointer
= hold
;
1810 } /* next piece is not a bitfield */
1812 /* In the general case, we can't allow
1813 full expressions with symbol
1814 differences and such. The relocation
1815 entries for symbols not defined in this
1816 assembly would require arbitrary field
1817 widths, positions, and masks which most
1818 of our current object formats don't
1821 In the specific case where a symbol
1822 *is* defined in this assembly, we
1823 *could* build fixups and track it, but
1824 this could lead to confusion for the
1825 backends. I'm lazy. I'll take any
1826 SEG_ABSOLUTE. I think that means that
1827 you can use a previous .set or
1828 .equ type symbol. xoxorich. */
1830 if (segment
== absent_section
)
1832 as_warn ("Using a bit field width of zero.");
1833 exp
->X_add_number
= 0;
1834 segment
= absolute_section
;
1835 } /* implied zero width bitfield */
1837 if (segment
!= absolute_section
)
1839 *input_line_pointer
= '\0';
1840 as_bad ("Field width \"%s\" too complex for a bitfield.\n", hold
);
1841 *input_line_pointer
= ':';
1842 demand_empty_rest_of_line ();
1846 if ((width
= exp
->X_add_number
) > (BITS_PER_CHAR
* nbytes
))
1848 as_warn ("Field width %d too big to fit in %d bytes: truncated to %d bits.",
1849 width
, nbytes
, (BITS_PER_CHAR
* nbytes
));
1850 width
= BITS_PER_CHAR
* nbytes
;
1853 if (width
> bits_available
)
1855 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1856 input_line_pointer
= hold
;
1857 exp
->X_add_number
= value
;
1861 hold
= ++input_line_pointer
; /* skip ':' */
1863 if ((segment
= expression (exp
)) != absolute_section
)
1865 char cache
= *input_line_pointer
;
1867 *input_line_pointer
= '\0';
1868 as_bad ("Field value \"%s\" too complex for a bitfield.\n", hold
);
1869 *input_line_pointer
= cache
;
1870 demand_empty_rest_of_line ();
1874 value
|= (~(-1 << width
) & exp
->X_add_number
)
1875 << ((BITS_PER_CHAR
* nbytes
) - bits_available
);
1877 if ((bits_available
-= width
) == 0
1878 || is_it_end_of_statement ()
1879 || *input_line_pointer
!= ',')
1882 } /* all the bitfields we're gonna get */
1884 hold
= ++input_line_pointer
;
1885 segment
= expression (exp
);
1886 } /* forever loop */
1888 exp
->X_add_number
= value
;
1889 exp
->X_seg
= absolute_section
;
1890 } /* if looks like a bitfield */
1891 } /* parse_bitfield_cons() */
1893 #endif /* BITFIELD_CONS_EXPRESSIONS */
1898 parse_mri_cons (exp
, nbytes
)
1900 unsigned int nbytes
;
1902 if (*input_line_pointer
== '\'')
1904 /* An MRI style string, cut into as many bytes as will fit into
1905 a nbyte chunk, left justify if necessary, and separate with
1906 commas so we can try again later */
1908 unsigned int result
= 0;
1909 input_line_pointer
++;
1910 for (scan
= 0; scan
< nbytes
; scan
++)
1912 if (*input_line_pointer
== '\'')
1914 if (input_line_pointer
[1] == '\'')
1916 input_line_pointer
++;
1921 result
= (result
<< 8) | (*input_line_pointer
++);
1925 while (scan
< nbytes
)
1930 /* Create correct expression */
1931 exp
->X_add_symbol
= 0;
1932 exp
->X_add_number
= result
;
1933 exp
->X_seg
= absolute_section
;
1934 /* Fake it so that we can read the next char too */
1935 if (input_line_pointer
[0] != '\'' ||
1936 (input_line_pointer
[0] == '\'' && input_line_pointer
[1] == '\''))
1938 input_line_pointer
-= 2;
1939 input_line_pointer
[0] = ',';
1940 input_line_pointer
[1] = '\'';
1943 input_line_pointer
++;
1951 #ifdef REPEAT_CONS_EXPRESSIONS
1953 /* Parse a repeat expression for cons. This is used by the MIPS
1954 assembler. The format is NUMBER:COUNT; NUMBER appears in the
1955 object file COUNT times.
1957 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
1960 parse_repeat_cons (exp
, nbytes
)
1962 unsigned int nbytes
;
1970 if (*input_line_pointer
!= ':')
1972 /* No repeat count. */
1976 ++input_line_pointer
;
1977 segment
= expression (&count
);
1978 if (segment
!= absolute_section
1979 || count
.X_add_number
<= 0)
1981 as_warn ("Unresolvable or nonpositive repeat count; using 1");
1985 /* The cons function is going to output this expression once. So we
1986 output it count - 1 times. */
1987 for (i
= count
.X_add_number
- 1; i
> 0; i
--)
1988 emit_expr (exp
, nbytes
);
1991 #endif /* REPEAT_CONS_EXPRESSIONS */
1996 * CONStruct more frag(s) of .quads, or .octa etc.
1997 * Makes 0 or more new frags.
1998 * If need_pass_2 == 1, generate no frag.
1999 * This understands only bignums, not expressions. Cons() understands
2002 * Constants recognised are '0...'(octal) '0x...'(hex) '...'(decimal).
2004 * This creates objects with struct obstack_control objs, destroying
2005 * any context objs held about a partially completed object. Beware!
2008 * I think it sucks to have 2 different types of integers, with 2
2009 * routines to read them, store them etc.
2010 * It would be nicer to permit bignums in expressions and only
2011 * complain if the result overflowed. However, due to "efficiency"...
2013 /* worker to do .quad etc statements */
2014 /* clobbers input_line_pointer, checks */
2016 /* 8=.quad 16=.octa ... */
2020 register int nbytes
;
2022 register char c
; /* input_line_pointer->c. */
2024 register long length
; /* Number of chars in an object. */
2025 register int digit
; /* Value of 1 digit. */
2026 register int carry
; /* For multi-precision arithmetic. */
2027 register int work
; /* For multi-precision arithmetic. */
2028 register char *p
; /* For multi-precision arithmetic. */
2030 extern const char hex_value
[]; /* In hex_value.c. */
2033 * The following awkward logic is to parse ZERO or more strings,
2034 * comma seperated. Recall an expression includes its leading &
2035 * trailing blanks. We fake a leading ',' if there is (supposed to
2036 * be) a 1st expression, and keep demanding 1 expression for each ','.
2038 if (is_it_end_of_statement ())
2040 c
= 0; /* Skip loop. */
2044 c
= ','; /* Do loop. */
2045 --input_line_pointer
;
2049 ++input_line_pointer
;
2051 c
= *input_line_pointer
;
2052 /* C contains 1st non-blank character of what we hope is a number. */
2055 c
= *++input_line_pointer
;
2056 if (c
== 'x' || c
== 'X')
2058 c
= *++input_line_pointer
;
2071 * This feature (?) is here to stop people worrying about
2072 * mysterious zero constants: which is what they get when
2073 * they completely omit digits.
2075 if (hex_value
[c
] >= radix
)
2077 as_bad ("Missing digits. 0 assumed.");
2079 bignum_high
= bignum_low
- 1; /* Start constant with 0 chars. */
2080 for (; (digit
= hex_value
[c
]) < radix
; c
= *++input_line_pointer
)
2082 /* Multiply existing number by radix, then add digit. */
2084 for (p
= bignum_low
; p
<= bignum_high
; p
++)
2086 work
= (*p
& MASK_CHAR
) * radix
+ carry
;
2087 *p
= work
& MASK_CHAR
;
2088 carry
= work
>> BITS_PER_CHAR
;
2093 *bignum_high
= carry
& MASK_CHAR
;
2094 know ((carry
& ~MASK_CHAR
) == 0);
2097 length
= bignum_high
- bignum_low
+ 1;
2098 if (length
> nbytes
)
2100 as_warn ("Most significant bits truncated in integer constant.");
2104 register long leading_zeroes
;
2106 for (leading_zeroes
= nbytes
- length
;
2116 char *src
= bignum_low
;
2117 p
= frag_more (nbytes
);
2118 if (target_big_endian
)
2121 for (i
= nbytes
- 1; i
>= 0; i
--)
2125 bcopy (bignum_low
, p
, (int) nbytes
);
2127 /* C contains character after number. */
2129 c
= *input_line_pointer
;
2130 /* C contains 1st non-blank character after number. */
2132 demand_empty_rest_of_line ();
2135 /* Extend bignum by 1 char. */
2139 register long length
;
2142 if (bignum_high
>= bignum_limit
)
2144 length
= bignum_limit
- bignum_low
;
2145 bignum_low
= xrealloc (bignum_low
, length
+ length
);
2146 bignum_high
= bignum_low
+ length
;
2147 bignum_limit
= bignum_low
+ length
+ length
;
2149 } /* grow_bignum(); */
2154 * CONStruct some more frag chars of .floats .ffloats etc.
2155 * Makes 0 or more new frags.
2156 * If need_pass_2 == 1, no frags are emitted.
2157 * This understands only floating literals, not expressions. Sorry.
2159 * A floating constant is defined by atof_generic(), except it is preceded
2160 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2161 * reading, I decided to be incompatible. This always tries to give you
2162 * rounded bits to the precision of the pseudo-op. Former AS did premature
2163 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2164 * a choice of 2 flavours of noise according to which of 2 floating-point
2165 * scanners you directed AS to use.
2167 * In: input_line_pointer->whitespace before, or '0' of flonum.
2171 void /* JF was static, but can't be if VAX.C is goning to use it */
2172 float_cons (float_type
) /* Worker to do .float etc statements. */
2173 /* Clobbers input_line-pointer, checks end-of-line. */
2174 register int float_type
; /* 'f':.ffloat ... 'F':.float ... */
2177 int length
; /* Number of chars in an object. */
2178 register char *err
; /* Error from scanning floating literal. */
2179 char temp
[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT
];
2181 if (is_it_end_of_statement ())
2183 demand_empty_rest_of_line ();
2189 /* input_line_pointer->1st char of a flonum (we hope!). */
2192 /* Skip any 0{letter} that may be present. Don't even check if the
2193 * letter is legal. Someone may invent a "z" format and this routine
2194 * has no use for such information. Lusers beware: you get
2195 * diagnostics if your input is ill-conditioned.
2197 if (input_line_pointer
[0] == '0' && isalpha (input_line_pointer
[1]))
2198 input_line_pointer
+= 2;
2200 err
= md_atof (float_type
, temp
, &length
);
2201 know (length
<= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT
);
2205 as_bad ("Bad floating literal: %s", err
);
2206 ignore_rest_of_line ();
2216 #ifdef REPEAT_CONS_EXPRESSIONS
2217 if (*input_line_pointer
== ':')
2220 expressionS count_exp
;
2222 ++input_line_pointer
;
2223 segment
= expression (&count_exp
);
2224 if (segment
!= absolute_section
2225 || count_exp
.X_add_number
<= 0)
2227 as_warn ("Unresolvable or nonpositive repeat count; using 1");
2230 count
= count_exp
.X_add_number
;
2234 while (--count
>= 0)
2236 p
= frag_more (length
);
2237 bcopy (temp
, p
, length
);
2242 while (*input_line_pointer
++ == ',');
2244 --input_line_pointer
; /* Put terminator back into stream. */
2245 demand_empty_rest_of_line ();
2246 } /* float_cons() */
2251 * We read 0 or more ',' seperated, double-quoted strings.
2253 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2258 stringer (append_zero
) /* Worker to do .ascii etc statements. */
2259 /* Checks end-of-line. */
2260 register int append_zero
; /* 0: don't append '\0', else 1 */
2262 register unsigned int c
;
2265 * The following awkward logic is to parse ZERO or more strings,
2266 * comma seperated. Recall a string expression includes spaces
2267 * before the opening '\"' and spaces after the closing '\"'.
2268 * We fake a leading ',' if there is (supposed to be)
2269 * a 1st, expression. We keep demanding expressions for each
2272 if (is_it_end_of_statement ())
2274 c
= 0; /* Skip loop. */
2275 ++input_line_pointer
; /* Compensate for end of loop. */
2279 c
= ','; /* Do loop. */
2281 while (c
== ',' || c
== '<' || c
== '"')
2284 switch (*input_line_pointer
)
2287 ++input_line_pointer
; /*->1st char of string. */
2288 while (is_a_char (c
= next_char_of_string ()))
2290 FRAG_APPEND_1_CHAR (c
);
2294 FRAG_APPEND_1_CHAR (0);
2296 know (input_line_pointer
[-1] == '\"');
2299 input_line_pointer
++;
2300 c
= get_single_number ();
2301 FRAG_APPEND_1_CHAR (c
);
2302 if (*input_line_pointer
!= '>')
2304 as_bad ("Expected <nn>");
2306 input_line_pointer
++;
2309 input_line_pointer
++;
2313 c
= *input_line_pointer
;
2316 demand_empty_rest_of_line ();
2319 /* FIXME-SOMEDAY: I had trouble here on characters with the
2320 high bits set. We'll probably also have trouble with
2321 multibyte chars, wide chars, etc. Also be careful about
2322 returning values bigger than 1 byte. xoxorich. */
2325 next_char_of_string ()
2327 register unsigned int c
;
2329 c
= *input_line_pointer
++ & CHAR_MASK
;
2337 switch (c
= *input_line_pointer
++)
2367 break; /* As itself. */
2382 for (number
= 0; isdigit (c
); c
= *input_line_pointer
++)
2384 number
= number
* 8 + c
- '0';
2388 --input_line_pointer
;
2392 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2393 as_warn ("Unterminated string: Newline inserted.");
2399 #ifdef ONLY_STANDARD_ESCAPES
2400 as_bad ("Bad escaped character in string, '?' assumed");
2402 #endif /* ONLY_STANDARD_ESCAPES */
2405 } /* switch on escaped char */
2410 } /* switch on char */
2412 } /* next_char_of_string() */
2415 get_segmented_expression (expP
)
2416 register expressionS
*expP
;
2418 register segT retval
;
2420 retval
= expression (expP
);
2421 if (retval
== pass1_section
2422 || retval
== absent_section
2423 || retval
== big_section
)
2425 as_bad ("Expected address expression: absolute 0 assumed");
2426 retval
= expP
->X_seg
= absolute_section
;
2427 expP
->X_add_number
= 0;
2428 expP
->X_add_symbol
= expP
->X_subtract_symbol
= 0;
2430 return (retval
); /* SEG_ ABSOLUTE,UNKNOWN,DATA,TEXT,BSS */
2434 get_known_segmented_expression (expP
)
2435 register expressionS
*expP
;
2437 register segT retval
;
2438 register CONST
char *name1
;
2439 register CONST
char *name2
;
2441 if ((retval
= get_segmented_expression (expP
)) == undefined_section
)
2443 name1
= expP
->X_add_symbol
? S_GET_NAME (expP
->X_add_symbol
) : "";
2444 name2
= expP
->X_subtract_symbol
?
2445 S_GET_NAME (expP
->X_subtract_symbol
) :
2449 as_warn ("Symbols \"%s\" \"%s\" are undefined: absolute 0 assumed.",
2454 as_warn ("Symbol \"%s\" undefined: absolute 0 assumed.",
2455 name1
? name1
: name2
);
2457 retval
= expP
->X_seg
= absolute_section
;
2458 expP
->X_add_number
= 0;
2459 expP
->X_add_symbol
= expP
->X_subtract_symbol
= NULL
;
2461 know (retval
== absolute_section
2462 || retval
== diff_section
2463 || SEG_NORMAL (retval
));
2466 } /* get_known_segmented_expression() */
2470 /* static */ long /* JF was static, but can't be if the MD pseudos are to use it */
2471 get_absolute_expression ()
2476 if ((s
= expression (&exp
)) != absolute_section
)
2478 if (s
!= absent_section
)
2480 as_bad ("Bad Absolute Expression, absolute 0 assumed.");
2482 exp
.X_add_number
= 0;
2484 return (exp
.X_add_number
);
2487 char /* return terminator */
2488 get_absolute_expression_and_terminator (val_pointer
)
2489 long *val_pointer
; /* return value of expression */
2491 *val_pointer
= get_absolute_expression ();
2492 return (*input_line_pointer
++);
2496 * demand_copy_C_string()
2498 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2499 * Give a warning if that happens.
2502 demand_copy_C_string (len_pointer
)
2507 if ((s
= demand_copy_string (len_pointer
)) != 0)
2511 for (len
= *len_pointer
;
2520 as_bad ("This string may not contain \'\\0\'");
2528 * demand_copy_string()
2530 * Demand string, but return a safe (=private) copy of the string.
2531 * Return NULL if we can't read a string here.
2534 demand_copy_string (lenP
)
2537 register unsigned int c
;
2543 if (*input_line_pointer
== '\"')
2545 input_line_pointer
++; /* Skip opening quote. */
2547 while (is_a_char (c
= next_char_of_string ()))
2549 obstack_1grow (¬es
, c
);
2552 /* JF this next line is so demand_copy_C_string will return a null
2553 termanated string. */
2554 obstack_1grow (¬es
, '\0');
2555 retval
= obstack_finish (¬es
);
2559 as_warn ("Missing string");
2561 ignore_rest_of_line ();
2565 } /* demand_copy_string() */
2568 * is_it_end_of_statement()
2570 * In: Input_line_pointer->next character.
2572 * Do: Skip input_line_pointer over all whitespace.
2574 * Out: 1 if input_line_pointer->end-of-line.
2577 is_it_end_of_statement ()
2580 return (is_end_of_line
[*input_line_pointer
]);
2581 } /* is_it_end_of_statement() */
2587 register symbolS
*symbolP
; /* symbol we are working with */
2589 input_line_pointer
++;
2590 if (*input_line_pointer
== '=')
2591 input_line_pointer
++;
2593 while (*input_line_pointer
== ' ' || *input_line_pointer
== '\t')
2594 input_line_pointer
++;
2596 if (sym_name
[0] == '.' && sym_name
[1] == '\0')
2598 /* Turn '. = mumble' into a .org mumble */
2599 register segT segment
;
2603 segment
= get_known_segmented_expression (&exp
);
2606 if (segment
!= now_seg
&& segment
!= absolute_section
)
2607 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2608 segment_name (segment
),
2609 segment_name (now_seg
));
2610 p
= frag_var (rs_org
, 1, 1, (relax_substateT
) 0, exp
.X_add_symbol
,
2611 exp
.X_add_number
, (char *) 0);
2613 } /* if (ok to make frag) */
2617 symbolP
= symbol_find_or_make (sym_name
);
2618 pseudo_set (symbolP
);
2622 /* .include -- include a file at this point. */
2635 filename
= demand_copy_string (&i
);
2636 demand_empty_rest_of_line ();
2637 path
= xmalloc (i
+ include_dir_maxlen
+ 5 /* slop */ );
2638 for (i
= 0; i
< include_dir_count
; i
++)
2640 strcpy (path
, include_dirs
[i
]);
2642 strcat (path
, filename
);
2643 if (0 != (try = fopen (path
, "r")))
2652 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2653 newbuf
= input_scrub_include_file (path
, input_line_pointer
);
2654 buffer_limit
= input_scrub_next_buffer (&input_line_pointer
);
2658 add_include_dir (path
)
2663 if (include_dir_count
== 0)
2665 include_dirs
= (char **) xmalloc (2 * sizeof (*include_dirs
));
2666 include_dirs
[0] = "."; /* Current dir */
2667 include_dir_count
= 2;
2671 include_dir_count
++;
2672 include_dirs
= (char **) realloc (include_dirs
,
2673 include_dir_count
* sizeof (*include_dirs
));
2676 include_dirs
[include_dir_count
- 1] = path
; /* New one */
2679 if (i
> include_dir_maxlen
)
2680 include_dir_maxlen
= i
;
2681 } /* add_include_dir() */
2687 while (!is_end_of_line
[*input_line_pointer
])
2689 ++input_line_pointer
;
2691 ++input_line_pointer
;