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- /* read.c - read a source file -
- Copyright (C) 1986, 1987, 1990, 1991, 1993, 1994
- Free Software Foundation, Inc.
-
- This file is part of GAS, the GNU Assembler.
-
- GAS is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GAS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GAS; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #if 0
- #define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
- change this a bit. But then, GNU isn't
- spozed to run on your machine anyway.
- (RMS is so shortsighted sometimes.)
- */
- #else
- #define MASK_CHAR ((int)(unsigned char)-1)
- #endif
-
-
- /* This is the largest known floating point format (for now). It will
- grow when we do 4361 style flonums. */
-
- #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
-
- /* Routines that read assembler source text to build spagetti in memory.
- Another group of these functions is in the expr.c module. */
-
- /* for isdigit() */
- #include <ctype.h>
-
- #include "as.h"
- #include "subsegs.h"
-
- #include "obstack.h"
- #include "listing.h"
-
- #ifndef TC_START_LABEL
- #define TC_START_LABEL(x,y) (x==':')
- #endif
-
- /* The NOP_OPCODE is for the alignment fill value.
- * fill it a nop instruction so that the disassembler does not choke
- * on it
- */
- #ifndef NOP_OPCODE
- #define NOP_OPCODE 0x00
- #endif
-
- char *input_line_pointer; /*->next char of source file to parse. */
-
- int generate_asm_lineno = 0; /* flag to generate line stab for .s file */
-
- #if BITS_PER_CHAR != 8
- /* The following table is indexed by[(char)] and will break if
- a char does not have exactly 256 states (hopefully 0:255!)! */
- die horribly;
- #endif
-
- #ifndef LEX_AT
- /* The m88k unfortunately uses @ as a label beginner. */
- #define LEX_AT 0
- #endif
-
- #ifndef LEX_BR
- /* The RS/6000 assembler uses {,},[,] as parts of symbol names. */
- #define LEX_BR 0
- #endif
-
- #ifndef LEX_PCT
- /* The Delta 68k assembler permits % inside label names. */
- #define LEX_PCT 0
- #endif
-
- /* used by is_... macros. our ctype[] */
- const char lex_type[256] =
- {
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
- 0, 0, 0, 0, 3, LEX_PCT, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
- LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
- 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, 0, 3, /* PQRSTUVWXYZ[\]^_ */
- 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
- 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, 0, 0, /* pqrstuvwxyz{|}~. */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- };
-
-
- /*
- * In: a character.
- * Out: 1 if this character ends a line.
- */
- #define _ (0)
- char is_end_of_line[256] =
- {
- #ifdef CR_EOL
- _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
- #else
- _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
- #endif
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- #ifdef TC_HPPA
- _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
- #else
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
- #endif
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
- };
- #undef _
-
- /* Functions private to this file. */
-
- static char *buffer; /* 1st char of each buffer of lines is here. */
- static char *buffer_limit; /*->1 + last char in buffer. */
-
- int target_big_endian;
-
- static char *old_buffer; /* JF a hack */
- static char *old_input;
- static char *old_limit;
-
- /* Variables for handling include file directory list. */
-
- char **include_dirs; /* List of pointers to directories to
- search for .include's */
- int include_dir_count; /* How many are in the list */
- int include_dir_maxlen = 1;/* Length of longest in list */
-
- #ifndef WORKING_DOT_WORD
- struct broken_word *broken_words;
- int new_broken_words;
- #endif
-
- char *demand_copy_string PARAMS ((int *lenP));
- int is_it_end_of_statement PARAMS ((void));
- static segT get_segmented_expression PARAMS ((expressionS *expP));
- static segT get_known_segmented_expression PARAMS ((expressionS * expP));
- static void pobegin PARAMS ((void));
-
-
- void
- read_begin ()
- {
- const char *p;
-
- pobegin ();
- obj_read_begin_hook ();
-
- /* Something close -- but not too close -- to a multiple of 1024.
- The debugging malloc I'm using has 24 bytes of overhead. */
- obstack_begin (¬es, 5090);
- obstack_begin (&cond_obstack, 990);
-
- /* Use machine dependent syntax */
- for (p = line_separator_chars; *p; p++)
- is_end_of_line[(unsigned char) *p] = 1;
- /* Use more. FIXME-SOMEDAY. */
- }
-
- /* set up pseudo-op tables */
-
- struct hash_control *po_hash;
-
- static const pseudo_typeS potable[] =
- {
- {"abort", s_abort, 0},
- {"align", s_align_ptwo, 0},
- {"ascii", stringer, 0},
- {"asciz", stringer, 1},
- /* block */
- {"byte", cons, 1},
- {"comm", s_comm, 0},
- {"data", s_data, 0},
- #ifdef S_SET_DESC
- {"desc", s_desc, 0},
- #endif
- /* dim */
- {"double", float_cons, 'd'},
- /* dsect */
- {"eject", listing_eject, 0}, /* Formfeed listing */
- {"else", s_else, 0},
- {"end", s_end, 0},
- {"endif", s_endif, 0},
- /* endef */
- {"equ", s_set, 0},
- /* err */
- /* extend */
- {"extern", s_ignore, 0}, /* We treat all undef as ext */
- {"appfile", s_app_file, 1},
- {"appline", s_app_line, 0},
- {"file", s_app_file, 0},
- {"fill", s_fill, 0},
- {"float", float_cons, 'f'},
- {"global", s_globl, 0},
- {"globl", s_globl, 0},
- {"hword", cons, 2},
- {"if", s_if, 0},
- {"ifdef", s_ifdef, 0},
- {"ifeqs", s_ifeqs, 0},
- {"ifndef", s_ifdef, 1},
- {"ifnes", s_ifeqs, 1},
- {"ifnotdef", s_ifdef, 1},
- {"include", s_include, 0},
- {"int", cons, 4},
- {"lcomm", s_lcomm, 0},
- {"lflags", listing_flags, 0}, /* Listing flags */
- {"list", listing_list, 1}, /* Turn listing on */
- {"long", cons, 4},
- {"lsym", s_lsym, 0},
- {"nolist", listing_list, 0}, /* Turn listing off */
- {"octa", cons, 16},
- {"org", s_org, 0},
- {"psize", listing_psize, 0}, /* set paper size */
- /* print */
- {"quad", cons, 8},
- {"sbttl", listing_title, 1}, /* Subtitle of listing */
- /* scl */
- /* sect */
- {"set", s_set, 0},
- {"short", cons, 2},
- {"single", float_cons, 'f'},
- /* size */
- {"space", s_space, 0},
- {"stabd", s_stab, 'd'},
- {"stabn", s_stab, 'n'},
- {"stabs", s_stab, 's'},
- {"string", stringer, 1},
- /* tag */
- {"text", s_text, 0},
-
- /* This is for gcc to use. It's only just been added (2/94), so gcc
- won't be able to use it for a while -- probably a year or more.
- But once this has been released, check with gcc maintainers
- before deleting it or even changing the spelling. */
- {"this_GCC_requires_the_GNU_assembler", s_ignore, 0},
- /* If we're folding case -- done for some targets, not necessarily
- all -- the above string in an input file will be converted to
- this one. Match it either way... */
- {"this_gcc_requires_the_gnu_assembler", s_ignore, 0},
-
- {"title", listing_title, 0}, /* Listing title */
- /* type */
- /* use */
- /* val */
- {"xstabs", s_xstab, 's'},
- {"word", cons, 2},
- {"zero", s_space, 0},
- {NULL} /* end sentinel */
- };
-
- static void
- pobegin ()
- {
- const char *errtxt; /* error text */
- const pseudo_typeS *pop;
-
- po_hash = hash_new ();
-
- /* Do the target-specific pseudo ops. */
- for (pop = md_pseudo_table; pop->poc_name; pop++)
- {
- errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
- if (errtxt)
- {
- as_fatal ("error constructing md pseudo-op table");
- } /* on error */
- } /* for each op */
-
- /* Now object specific. Skip any that were in the target table. */
- for (pop = obj_pseudo_table; pop->poc_name; pop++)
- {
- errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
- if (errtxt)
- {
- if (!strcmp (errtxt, "exists"))
- {
- #ifdef DIE_ON_OVERRIDES
- as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
- #endif /* DIE_ON_OVERRIDES */
- continue; /* OK if target table overrides. */
- }
- else
- {
- as_fatal ("error constructing obj pseudo-op table");
- } /* if overridden */
- } /* on error */
- } /* for each op */
-
- /* Now portable ones. Skip any that we've seen already. */
- for (pop = potable; pop->poc_name; pop++)
- {
- errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
- if (errtxt)
- {
- if (!strcmp (errtxt, "exists"))
- {
- #ifdef DIE_ON_OVERRIDES
- as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
- #endif /* DIE_ON_OVERRIDES */
- continue; /* OK if target table overrides. */
- }
- else
- {
- as_fatal ("error constructing obj pseudo-op table");
- } /* if overridden */
- } /* on error */
- } /* for each op */
-
- return;
- } /* pobegin() */
-
- #define HANDLE_CONDITIONAL_ASSEMBLY() \
- if (ignore_input ()) \
- { \
- while (! is_end_of_line[(unsigned char) *input_line_pointer++]) \
- if (input_line_pointer == buffer_limit) \
- break; \
- continue; \
- }
-
-
- /* read_a_source_file()
- *
- * We read the file, putting things into a web that
- * represents what we have been reading.
- */
- void
- read_a_source_file (name)
- char *name;
- {
- register char c;
- register char *s; /* string of symbol, '\0' appended */
- register int temp;
- pseudo_typeS *pop;
-
- buffer = input_scrub_new_file (name);
-
- listing_file (name);
- listing_newline ("");
-
- while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
- { /* We have another line to parse. */
- know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
- contin: /* JF this goto is my fault I admit it.
- Someone brave please re-write the whole
- input section here? Pleeze??? */
- while (input_line_pointer < buffer_limit)
- {
- /* We have more of this buffer to parse. */
-
- /*
- * We now have input_line_pointer->1st char of next line.
- * If input_line_pointer [-1] == '\n' then we just
- * scanned another line: so bump line counters.
- */
- if (is_end_of_line[(unsigned char) input_line_pointer[-1]])
- {
- if (input_line_pointer[-1] == '\n')
- bump_line_counters ();
-
- #if defined (MRI) || defined (LABELS_WITHOUT_COLONS)
- /* Text at the start of a line must be a label, we run down
- and stick a colon in. */
- if (is_name_beginner (*input_line_pointer))
- {
- char *line_start = input_line_pointer;
- char c = get_symbol_end ();
- colon (line_start);
- *input_line_pointer = c;
- if (c == ':')
- input_line_pointer++;
-
- }
- #endif
- }
-
-
- /*
- * We are at the begining of a line, or similar place.
- * We expect a well-formed assembler statement.
- * A "symbol-name:" is a statement.
- *
- * Depending on what compiler is used, the order of these tests
- * may vary to catch most common case 1st.
- * Each test is independent of all other tests at the (top) level.
- * PLEASE make a compiler that doesn't use this assembler.
- * It is crufty to waste a compiler's time encoding things for this
- * assembler, which then wastes more time decoding it.
- * (And communicating via (linear) files is silly!
- * If you must pass stuff, please pass a tree!)
- */
- if ((c = *input_line_pointer++) == '\t'
- || c == ' '
- || c == '\f'
- || c == 0)
- {
- c = *input_line_pointer++;
- }
- know (c != ' '); /* No further leading whitespace. */
- LISTING_NEWLINE ();
- /*
- * C is the 1st significant character.
- * Input_line_pointer points after that character.
- */
- if (is_name_beginner (c))
- {
- /* want user-defined label or pseudo/opcode */
- HANDLE_CONDITIONAL_ASSEMBLY ();
-
- s = --input_line_pointer;
- c = get_symbol_end (); /* name's delimiter */
- /*
- * C is character after symbol.
- * That character's place in the input line is now '\0'.
- * S points to the beginning of the symbol.
- * [In case of pseudo-op, s->'.'.]
- * Input_line_pointer->'\0' where c was.
- */
- if (TC_START_LABEL(c, input_line_pointer))
- {
- colon (s); /* user-defined label */
- *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
- /* Input_line_pointer->after ':'. */
- SKIP_WHITESPACE ();
-
-
- }
- else if (c == '='
- || (input_line_pointer[1] == '='
- #ifdef TC_EQUAL_IN_INSN
- && ! TC_EQUAL_IN_INSN (c, input_line_pointer)
- #endif
- ))
- {
- equals (s);
- demand_empty_rest_of_line ();
- }
- else
- { /* expect pseudo-op or machine instruction */
- #ifdef MRI
- if (!done_pseudo (s))
-
- #else
-
- pop = NULL;
-
- #define IGNORE_OPCODE_CASE
- #ifdef IGNORE_OPCODE_CASE
- {
- char *s2 = s;
- while (*s2)
- {
- if (isupper (*s2))
- *s2 = tolower (*s2);
- s2++;
- }
- }
- #endif
-
- #ifdef NO_PSEUDO_DOT
- /* The m88k uses pseudo-ops without a period. */
- pop = (pseudo_typeS *) hash_find (po_hash, s);
- if (pop != NULL && pop->poc_handler == NULL)
- pop = NULL;
- #endif
-
- if (pop != NULL || *s == '.')
- {
- /*
- * PSEUDO - OP.
- *
- * WARNING: c has next char, which may be end-of-line.
- * We lookup the pseudo-op table with s+1 because we
- * already know that the pseudo-op begins with a '.'.
- */
-
- if (pop == NULL)
- pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
-
- /* Print the error msg now, while we still can */
- if (pop == NULL)
- {
- as_bad ("Unknown pseudo-op: `%s'", s);
- *input_line_pointer = c;
- s_ignore (0);
- continue;
- }
-
- /* Put it back for error messages etc. */
- *input_line_pointer = c;
- /* The following skip of whitespace is compulsory.
- A well shaped space is sometimes all that separates
- keyword from operands. */
- if (c == ' ' || c == '\t')
- input_line_pointer++;
- /*
- * Input_line is restored.
- * Input_line_pointer->1st non-blank char
- * after pseudo-operation.
- */
- (*pop->poc_handler) (pop->poc_val);
- }
- else
- #endif
- { /* machine instruction */
- /* WARNING: c has char, which may be end-of-line. */
- /* Also: input_line_pointer->`\0` where c was. */
- *input_line_pointer = c;
- while (!is_end_of_line[(unsigned char) *input_line_pointer]
- #ifdef TC_EOL_IN_INSN
- || TC_EOL_IN_INSN (input_line_pointer)
- #endif
- )
- {
- input_line_pointer++;
- }
-
- c = *input_line_pointer;
- *input_line_pointer = '\0';
-
- #ifdef OBJ_GENERATE_ASM_LINENO
- if (generate_asm_lineno == 0)
- {
- if (ecoff_no_current_file())
- generate_asm_lineno = 1;
- }
- if (generate_asm_lineno == 1)
- {
- unsigned int lineno;
- char *s;
- as_where (&s, &lineno);
- OBJ_GENERATE_ASM_LINENO (s, lineno);
- }
- #endif
-
- md_assemble (s); /* Assemble 1 instruction. */
-
- *input_line_pointer++ = c;
-
- /* We resume loop AFTER the end-of-line from
- this instruction. */
- } /* if (*s=='.') */
- } /* if c==':' */
- continue;
- } /* if (is_name_beginner(c) */
-
-
- /* Empty statement? */
- if (is_end_of_line[(unsigned char) c])
- continue;
-
- #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
- if (isdigit (c))
- {
- /* local label ("4:") */
- char *backup = input_line_pointer;
-
- HANDLE_CONDITIONAL_ASSEMBLY ();
-
- temp = c - '0';
-
- while (isdigit (*input_line_pointer))
- {
- temp = (temp * 10) + *input_line_pointer - '0';
- ++input_line_pointer;
- } /* read the whole number */
-
- #ifdef LOCAL_LABELS_DOLLAR
- if (*input_line_pointer == '$'
- && *(input_line_pointer + 1) == ':')
- {
- input_line_pointer += 2;
-
- if (dollar_label_defined (temp))
- {
- as_fatal ("label \"%d$\" redefined", temp);
- }
-
- define_dollar_label (temp);
- colon (dollar_label_name (temp, 0));
- continue;
- }
- #endif /* LOCAL_LABELS_DOLLAR */
-
- #ifdef LOCAL_LABELS_FB
- if (*input_line_pointer++ == ':')
- {
- fb_label_instance_inc (temp);
- colon (fb_label_name (temp, 0));
- continue;
- }
- #endif /* LOCAL_LABELS_FB */
-
- input_line_pointer = backup;
- } /* local label ("4:") */
- #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
-
- if (c && strchr (line_comment_chars, c))
- { /* Its a comment. Better say APP or NO_APP */
- char *ends;
- char *new_buf;
- char *new_tmp;
- unsigned int new_length;
- char *tmp_buf = 0;
- extern char *scrub_string, *scrub_last_string;
-
- bump_line_counters ();
- s = input_line_pointer;
- if (strncmp (s, "APP\n", 4))
- continue; /* We ignore it */
- s += 4;
-
- ends = strstr (s, "#NO_APP\n");
-
- if (!ends)
- {
- unsigned int tmp_len;
- unsigned int num;
-
- /* The end of the #APP wasn't in this buffer. We
- keep reading in buffers until we find the #NO_APP
- that goes with this #APP There is one. The specs
- guarentee it. . . */
- tmp_len = buffer_limit - s;
- tmp_buf = xmalloc (tmp_len + 1);
- memcpy (tmp_buf, s, tmp_len);
- do
- {
- new_tmp = input_scrub_next_buffer (&buffer);
- if (!new_tmp)
- break;
- else
- buffer_limit = new_tmp;
- input_line_pointer = buffer;
- ends = strstr (buffer, "#NO_APP\n");
- if (ends)
- num = ends - buffer;
- else
- num = buffer_limit - buffer;
-
- tmp_buf = xrealloc (tmp_buf, tmp_len + num);
- memcpy (tmp_buf + tmp_len, buffer, num);
- tmp_len += num;
- }
- while (!ends);
-
- input_line_pointer = ends ? ends + 8 : NULL;
-
- s = tmp_buf;
- ends = s + tmp_len;
-
- }
- else
- {
- input_line_pointer = ends + 8;
- }
- new_buf = xmalloc (100);
- new_length = 100;
- new_tmp = new_buf;
-
- scrub_string = s;
- scrub_last_string = ends;
- for (;;)
- {
- int ch;
-
- ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
- if (ch == EOF)
- break;
- *new_tmp++ = ch;
- if (new_tmp == new_buf + new_length)
- {
- new_buf = xrealloc (new_buf, new_length + 100);
- new_tmp = new_buf + new_length;
- new_length += 100;
- }
- }
-
- if (tmp_buf)
- free (tmp_buf);
- old_buffer = buffer;
- old_input = input_line_pointer;
- old_limit = buffer_limit;
- buffer = new_buf;
- input_line_pointer = new_buf;
- buffer_limit = new_tmp;
- continue;
- }
-
- HANDLE_CONDITIONAL_ASSEMBLY ();
-
- /* as_warn("Junk character %d.",c); Now done by ignore_rest */
- input_line_pointer--; /* Report unknown char as ignored. */
- ignore_rest_of_line ();
- } /* while (input_line_pointer<buffer_limit) */
- if (old_buffer)
- {
- bump_line_counters ();
- if (old_input != 0)
- {
- buffer = old_buffer;
- input_line_pointer = old_input;
- buffer_limit = old_limit;
- old_buffer = 0;
- goto contin;
- }
- }
- } /* while (more buffers to scan) */
- input_scrub_close (); /* Close the input file */
-
- }
-
- void
- s_abort (ignore)
- int ignore;
- {
- as_fatal (".abort detected. Abandoning ship.");
- }
-
- /* Guts of .align directive. */
- static void
- do_align (n, fill)
- int n;
- char *fill;
- {
- #ifdef md_do_align
- md_do_align (n, fill, just_record_alignment);
- #endif
- if (!fill)
- {
- /* @@ Fix this right for BFD! */
- static char zero;
- static char nop_opcode = NOP_OPCODE;
-
- if (now_seg != data_section && now_seg != bss_section)
- {
- fill = &nop_opcode;
- }
- else
- {
- fill = &zero;
- }
- }
- /* Only make a frag if we HAVE to. . . */
- if (n && !need_pass_2)
- frag_align (n, *fill);
-
- #ifdef md_do_align
- just_record_alignment:
- #endif
-
- record_alignment (now_seg, n);
- }
-
- /* For machines where ".align 4" means align to a 4 byte boundary. */
- void
- s_align_bytes (arg)
- int arg;
- {
- register unsigned int temp;
- char temp_fill;
- unsigned int i = 0;
- unsigned long max_alignment = 1 << 15;
-
- if (is_end_of_line[(unsigned char) *input_line_pointer])
- temp = arg; /* Default value from pseudo-op table */
- else
- temp = get_absolute_expression ();
-
- if (temp > max_alignment)
- {
- as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
- }
-
- /* For the sparc, `.align (1<<n)' actually means `.align n' so we
- have to convert it. */
- if (temp != 0)
- {
- for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
- ;
- }
- if (temp != 1)
- as_bad ("Alignment not a power of 2");
-
- temp = i;
- if (*input_line_pointer == ',')
- {
- input_line_pointer++;
- temp_fill = get_absolute_expression ();
- do_align (temp, &temp_fill);
- }
- else
- do_align (temp, (char *) 0);
-
- demand_empty_rest_of_line ();
- }
-
- /* For machines where ".align 4" means align to 2**4 boundary. */
- void
- s_align_ptwo (ignore)
- int ignore;
- {
- register int temp;
- char temp_fill;
- long max_alignment = 15;
-
- temp = get_absolute_expression ();
- if (temp > max_alignment)
- as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
- else if (temp < 0)
- {
- as_bad ("Alignment negative. 0 assumed.");
- temp = 0;
- }
- if (*input_line_pointer == ',')
- {
- input_line_pointer++;
- temp_fill = get_absolute_expression ();
- do_align (temp, &temp_fill);
- }
- else
- do_align (temp, (char *) 0);
-
- demand_empty_rest_of_line ();
- }
-
- void
- s_comm (ignore)
- int ignore;
- {
- register char *name;
- register char c;
- register char *p;
- offsetT temp;
- register symbolS *symbolP;
-
- name = input_line_pointer;
- c = get_symbol_end ();
- /* just after name is now '\0' */
- p = input_line_pointer;
- *p = c;
- SKIP_WHITESPACE ();
- if (*input_line_pointer != ',')
- {
- as_bad ("Expected comma after symbol-name: rest of line ignored.");
- ignore_rest_of_line ();
- return;
- }
- input_line_pointer++; /* skip ',' */
- if ((temp = get_absolute_expression ()) < 0)
- {
- as_warn (".COMMon length (%ld.) <0! Ignored.", (long) temp);
- ignore_rest_of_line ();
- return;
- }
- *p = 0;
- symbolP = symbol_find_or_make (name);
- *p = c;
- if (S_IS_DEFINED (symbolP))
- {
- as_bad ("Ignoring attempt to re-define symbol `%s'.",
- S_GET_NAME (symbolP));
- ignore_rest_of_line ();
- return;
- }
- if (S_GET_VALUE (symbolP))
- {
- if (S_GET_VALUE (symbolP) != (valueT) temp)
- as_bad ("Length of .comm \"%s\" is already %ld. Not changed to %ld.",
- S_GET_NAME (symbolP),
- (long) S_GET_VALUE (symbolP),
- (long) temp);
- }
- else
- {
- S_SET_VALUE (symbolP, (valueT) temp);
- S_SET_EXTERNAL (symbolP);
- }
- #ifdef OBJ_VMS
- {
- extern int flag_one;
- if ( (!temp) || !flag_one)
- S_GET_OTHER(symbolP) = const_flag;
- }
- #endif /* not OBJ_VMS */
- know (symbolP->sy_frag == &zero_address_frag);
- demand_empty_rest_of_line ();
- } /* s_comm() */
-
- void
- s_data (ignore)
- int ignore;
- {
- segT section;
- register int temp;
-
- temp = get_absolute_expression ();
- if (flag_readonly_data_in_text)
- {
- section = text_section;
- temp += 1000;
- }
- else
- section = data_section;
-
- subseg_set (section, (subsegT) temp);
-
- #ifdef OBJ_VMS
- const_flag = 0;
- #endif
- demand_empty_rest_of_line ();
- }
-
- /* Handle the .appfile pseudo-op. This is automatically generated by
- do_scrub_next_char when a preprocessor # line comment is seen with
- a file name. This default definition may be overridden by the
- object or CPU specific pseudo-ops. This function is also the
- default definition for .file; the APPFILE argument is 1 for
- .appfile, 0 for .file. */
-
- void
- s_app_file (appfile)
- int appfile;
- {
- register char *s;
- int length;
-
- /* Some assemblers tolerate immediately following '"' */
- if ((s = demand_copy_string (&length)) != 0)
- {
- /* If this is a fake .appfile, a fake newline was inserted into
- the buffer. Passing -2 to new_logical_line tells it to
- account for it. */
- new_logical_line (s, appfile ? -2 : -1);
- demand_empty_rest_of_line ();
- #ifdef LISTING
- if (listing)
- listing_source_file (s);
- #endif
- }
- #ifdef OBJ_COFF
- c_dot_file_symbol (s);
- #endif /* OBJ_COFF */
- #ifdef OBJ_ELF
- elf_file_symbol (s);
- #endif
- }
-
- /* Handle the .appline pseudo-op. This is automatically generated by
- do_scrub_next_char when a preprocessor # line comment is seen.
- This default definition may be overridden by the object or CPU
- specific pseudo-ops. */
-
- void
- s_app_line (ignore)
- int ignore;
- {
- int l;
-
- /* The given number is that of the next line. */
- l = get_absolute_expression () - 1;
- new_logical_line ((char *) NULL, l);
- #ifdef LISTING
- if (listing)
- listing_source_line (l);
- #endif
- demand_empty_rest_of_line ();
- }
-
- void
- s_fill (ignore)
- int ignore;
- {
- long temp_repeat = 0;
- long temp_size = 1;
- register long temp_fill = 0;
- char *p;
-
-
- temp_repeat = get_absolute_expression ();
- if (*input_line_pointer == ',')
- {
- input_line_pointer++;
- temp_size = get_absolute_expression ();
- if (*input_line_pointer == ',')
- {
- input_line_pointer++;
- temp_fill = get_absolute_expression ();
- }
- }
- /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
- #define BSD_FILL_SIZE_CROCK_8 (8)
- if (temp_size > BSD_FILL_SIZE_CROCK_8)
- {
- as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
- temp_size = BSD_FILL_SIZE_CROCK_8;
- }
- if (temp_size < 0)
- {
- as_warn ("Size negative: .fill ignored.");
- temp_size = 0;
- }
- else if (temp_repeat <= 0)
- {
- as_warn ("Repeat < 0, .fill ignored");
- temp_size = 0;
- }
-
- if (temp_size && !need_pass_2)
- {
- p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
- memset (p, 0, (unsigned int) temp_size);
- /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
- * flavoured AS. The following bizzare behaviour is to be
- * compatible with above. I guess they tried to take up to 8
- * bytes from a 4-byte expression and they forgot to sign
- * extend. Un*x Sux. */
- #define BSD_FILL_SIZE_CROCK_4 (4)
- md_number_to_chars (p, (valueT) temp_fill,
- (temp_size > BSD_FILL_SIZE_CROCK_4
- ? BSD_FILL_SIZE_CROCK_4
- : (int) temp_size));
- /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
- * but emits no error message because it seems a legal thing to do.
- * It is a degenerate case of .fill but could be emitted by a compiler.
- */
- }
- demand_empty_rest_of_line ();
- }
-
- void
- s_globl (ignore)
- int ignore;
- {
- char *name;
- int c;
- symbolS *symbolP;
-
- do
- {
- name = input_line_pointer;
- c = get_symbol_end ();
- symbolP = symbol_find_or_make (name);
- *input_line_pointer = c;
- SKIP_WHITESPACE ();
- S_SET_EXTERNAL (symbolP);
- if (c == ',')
- {
- input_line_pointer++;
- SKIP_WHITESPACE ();
- if (*input_line_pointer == '\n')
- c = '\n';
- }
- }
- while (c == ',');
- demand_empty_rest_of_line ();
- }
-
- void
- s_lcomm (needs_align)
- /* 1 if this was a ".bss" directive, which may require a 3rd argument
- (alignment); 0 if it was an ".lcomm" (2 args only) */
- int needs_align;
- {
- register char *name;
- register char c;
- register char *p;
- register int temp;
- register symbolS *symbolP;
- segT current_seg = now_seg;
- subsegT current_subseg = now_subseg;
- const int max_alignment = 15;
- int align = 0;
- segT bss_seg = bss_section;
-
- name = input_line_pointer;
- c = get_symbol_end ();
- p = input_line_pointer;
- *p = c;
- SKIP_WHITESPACE ();
-
- /* Accept an optional comma after the name. The comma used to be
- required, but Irix 5 cc does not generate it. */
- if (*input_line_pointer == ',')
- {
- ++input_line_pointer;
- SKIP_WHITESPACE ();
- }
-
- if (*input_line_pointer == '\n')
- {
- as_bad ("Missing size expression");
- return;
- }
-
- if ((temp = get_absolute_expression ()) < 0)
- {
- as_warn ("BSS length (%d.) <0! Ignored.", temp);
- ignore_rest_of_line ();
- return;
- }
-
- #if defined (TC_MIPS) || defined (TC_ALPHA)
- #if defined (OBJ_ECOFF) || defined (OBJ_ELF)
- /* For MIPS and Alpha ECOFF or ELF, small objects are put in .sbss. */
- if (temp <= bfd_get_gp_size (stdoutput))
- {
- bss_seg = subseg_new (".sbss", 1);
- seg_info (bss_seg)->bss = 1;
- }
- #endif
- #endif
- if (!needs_align)
- {
- /* FIXME. This needs to be machine independent. */
- if (temp >= 8)
- align = 3;
- else if (temp >= 4)
- align = 2;
- else if (temp >= 2)
- align = 1;
- else
- align = temp;
-
- record_alignment(bss_seg, align);
- }
-
- if (needs_align)
- {
- align = 0;
- SKIP_WHITESPACE ();
- if (*input_line_pointer != ',')
- {
- as_bad ("Expected comma after size");
- ignore_rest_of_line ();
- return;
- }
- input_line_pointer++;
- SKIP_WHITESPACE ();
- if (*input_line_pointer == '\n')
- {
- as_bad ("Missing alignment");
- return;
- }
- align = get_absolute_expression ();
- if (align > max_alignment)
- {
- align = max_alignment;
- as_warn ("Alignment too large: %d. assumed.", align);
- }
- else if (align < 0)
- {
- align = 0;
- as_warn ("Alignment negative. 0 assumed.");
- }
- record_alignment (bss_seg, align);
- } /* if needs align */
- else
- {
- /* Assume some objects may require alignment on some systems. */
- #ifdef TC_ALPHA
- if (temp > 1)
- {
- align = ffs (temp) - 1;
- if (temp % (1 << align))
- abort ();
- }
- #endif
- }
-
- *p = 0;
- symbolP = symbol_find_or_make (name);
- *p = c;
-
- if (
- #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
- S_GET_OTHER (symbolP) == 0 &&
- S_GET_DESC (symbolP) == 0 &&
- #endif /* OBJ_AOUT or OBJ_BOUT */
- (S_GET_SEGMENT (symbolP) == bss_seg
- || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
- {
- char *pfrag;
-
- subseg_set (bss_seg, 1);
-
- if (align)
- frag_align (align, 0);
- /* detach from old frag */
- if (S_GET_SEGMENT (symbolP) == bss_seg)
- symbolP->sy_frag->fr_symbol = NULL;
-
- symbolP->sy_frag = frag_now;
- pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
- temp, (char *)0);
- *pfrag = 0;
-
- S_SET_SEGMENT (symbolP, bss_seg);
-
- #ifdef OBJ_COFF
- /* The symbol may already have been created with a preceding
- ".globl" directive -- be careful not to step on storage class
- in that case. Otherwise, set it to static. */
- if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
- {
- S_SET_STORAGE_CLASS (symbolP, C_STAT);
- }
- #endif /* OBJ_COFF */
- }
- else
- as_bad ("Ignoring attempt to re-define symbol `%s'.",
- S_GET_NAME (symbolP));
-
- subseg_set (current_seg, current_subseg);
-
- demand_empty_rest_of_line ();
- } /* s_lcomm() */
-
- void
- s_lsym (ignore)
- int ignore;
- {
- register char *name;
- register char c;
- register char *p;
- expressionS exp;
- register symbolS *symbolP;
-
- /* we permit ANY defined expression: BSD4.2 demands constants */
- name = input_line_pointer;
- c = get_symbol_end ();
- p = input_line_pointer;
- *p = c;
- SKIP_WHITESPACE ();
- if (*input_line_pointer != ',')
- {
- *p = 0;
- as_bad ("Expected comma after name \"%s\"", name);
- *p = c;
- ignore_rest_of_line ();
- return;
- }
- input_line_pointer++;
- expression (&exp);
- if (exp.X_op != O_constant
- && exp.X_op != O_register)
- {
- as_bad ("bad expression");
- ignore_rest_of_line ();
- return;
- }
- *p = 0;
- symbolP = symbol_find_or_make (name);
-
- /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
- symbolP->sy_desc == 0) out of this test because coff doesn't have
- those fields, and I can't see when they'd ever be tripped. I
- don't think I understand why they were here so I may have
- introduced a bug. As recently as 1.37 didn't have this test
- anyway. xoxorich. */
-
- if (S_GET_SEGMENT (symbolP) == undefined_section
- && S_GET_VALUE (symbolP) == 0)
- {
- /* The name might be an undefined .global symbol; be sure to
- keep the "external" bit. */
- S_SET_SEGMENT (symbolP,
- (exp.X_op == O_constant
- ? absolute_section
- : reg_section));
- S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
- }
- else
- {
- as_bad ("Symbol %s already defined", name);
- }
- *p = c;
- demand_empty_rest_of_line ();
- } /* s_lsym() */
-
- void
- s_org (ignore)
- int ignore;
- {
- register segT segment;
- expressionS exp;
- register long temp_fill;
- register char *p;
- /* Don't believe the documentation of BSD 4.2 AS. There is no such
- thing as a sub-segment-relative origin. Any absolute origin is
- given a warning, then assumed to be segment-relative. Any
- segmented origin expression ("foo+42") had better be in the right
- segment or the .org is ignored.
-
- BSD 4.2 AS warns if you try to .org backwards. We cannot because
- we never know sub-segment sizes when we are reading code. BSD
- will crash trying to emit negative numbers of filler bytes in
- certain .orgs. We don't crash, but see as-write for that code.
-
- Don't make frag if need_pass_2==1. */
- segment = get_known_segmented_expression (&exp);
- if (*input_line_pointer == ',')
- {
- input_line_pointer++;
- temp_fill = get_absolute_expression ();
- }
- else
- temp_fill = 0;
- if (!need_pass_2)
- {
- if (segment != now_seg && segment != absolute_section)
- as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
- segment_name (segment), segment_name (now_seg));
- p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
- exp.X_add_number, (char *) 0);
- *p = temp_fill;
- } /* if (ok to make frag) */
- demand_empty_rest_of_line ();
- } /* s_org() */
-
- void
- s_set (ignore)
- int ignore;
- {
- register char *name;
- register char delim;
- register char *end_name;
- register symbolS *symbolP;
-
- /*
- * Especial apologies for the random logic:
- * this just grew, and could be parsed much more simply!
- * Dean in haste.
- */
- name = input_line_pointer;
- delim = get_symbol_end ();
- end_name = input_line_pointer;
- *end_name = delim;
- SKIP_WHITESPACE ();
-
- if (*input_line_pointer != ',')
- {
- *end_name = 0;
- as_bad ("Expected comma after name \"%s\"", name);
- *end_name = delim;
- ignore_rest_of_line ();
- return;
- }
-
- input_line_pointer++;
- *end_name = 0;
-
- if (name[0] == '.' && name[1] == '\0')
- {
- /* Turn '. = mumble' into a .org mumble */
- register segT segment;
- expressionS exp;
- register char *ptr;
-
- segment = get_known_segmented_expression (&exp);
-
- if (!need_pass_2)
- {
- if (segment != now_seg && segment != absolute_section)
- as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
- segment_name (segment),
- segment_name (now_seg));
- ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
- exp.X_add_number, (char *) 0);
- *ptr = 0;
- } /* if (ok to make frag) */
-
- *end_name = delim;
- return;
- }
-
- if ((symbolP = symbol_find (name)) == NULL
- && (symbolP = md_undefined_symbol (name)) == NULL)
- {
- symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
- #ifdef OBJ_COFF
- /* "set" symbols are local unless otherwise specified. */
- SF_SET_LOCAL (symbolP);
- #endif /* OBJ_COFF */
-
- } /* make a new symbol */
-
- symbol_table_insert (symbolP);
-
- *end_name = delim;
- pseudo_set (symbolP);
- demand_empty_rest_of_line ();
- } /* s_set() */
-
- void
- s_space (mult)
- int mult;
- {
- long temp_repeat;
- register long temp_fill;
- register char *p;
-
- /* Just like .fill, but temp_size = 1 */
- if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
- {
- temp_fill = get_absolute_expression ();
- }
- else
- {
- input_line_pointer--; /* Backup over what was not a ','. */
- temp_fill = 0;
- }
- if (mult)
- {
- temp_repeat *= mult;
- }
- if (temp_repeat <= 0)
- {
- as_warn ("Repeat < 0, .space ignored");
- ignore_rest_of_line ();
- return;
- }
- if (!need_pass_2)
- {
- p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
- temp_repeat, (char *) 0);
- *p = temp_fill;
- }
- demand_empty_rest_of_line ();
- } /* s_space() */
-
- void
- s_text (ignore)
- int ignore;
- {
- register int temp;
-
- temp = get_absolute_expression ();
- subseg_set (text_section, (subsegT) temp);
- demand_empty_rest_of_line ();
- #ifdef OBJ_VMS
- const_flag &= ~IN_DEFAULT_SECTION;
- #endif
- } /* s_text() */
-
-
- void
- demand_empty_rest_of_line ()
- {
- SKIP_WHITESPACE ();
- if (is_end_of_line[(unsigned char) *input_line_pointer])
- {
- input_line_pointer++;
- }
- else
- {
- ignore_rest_of_line ();
- }
- /* Return having already swallowed end-of-line. */
- } /* Return pointing just after end-of-line. */
-
- void
- ignore_rest_of_line () /* For suspect lines: gives warning. */
- {
- if (!is_end_of_line[(unsigned char) *input_line_pointer])
- {
- if (isprint (*input_line_pointer))
- as_bad ("Rest of line ignored. First ignored character is `%c'.",
- *input_line_pointer);
- else
- as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
- *input_line_pointer);
- while (input_line_pointer < buffer_limit
- && !is_end_of_line[(unsigned char) *input_line_pointer])
- {
- input_line_pointer++;
- }
- }
- input_line_pointer++; /* Return pointing just after end-of-line. */
- know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
- }
-
- /*
- * pseudo_set()
- *
- * In: Pointer to a symbol.
- * Input_line_pointer->expression.
- *
- * Out: Input_line_pointer->just after any whitespace after expression.
- * Tried to set symbol to value of expression.
- * Will change symbols type, value, and frag;
- */
- void
- pseudo_set (symbolP)
- symbolS *symbolP;
- {
- expressionS exp;
- #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
- int ext;
- #endif /* OBJ_AOUT or OBJ_BOUT */
-
- know (symbolP); /* NULL pointer is logic error. */
- #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
- ext = S_IS_EXTERNAL (symbolP);
- #endif /* OBJ_AOUT or OBJ_BOUT */
-
- (void) expression (&exp);
-
- if (exp.X_op == O_illegal)
- as_bad ("illegal expression; zero assumed");
- else if (exp.X_op == O_absent)
- as_bad ("missing expression; zero assumed");
- else if (exp.X_op == O_big)
- as_bad ("%s number invalid; zero assumed",
- exp.X_add_number > 0 ? "bignum" : "floating point");
- else if (exp.X_op == O_subtract
- && (S_GET_SEGMENT (exp.X_add_symbol)
- == S_GET_SEGMENT (exp.X_op_symbol))
- && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
- && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
- {
- exp.X_op = O_constant;
- exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
- - S_GET_VALUE (exp.X_op_symbol));
- }
-
- switch (exp.X_op)
- {
- case O_illegal:
- case O_absent:
- case O_big:
- exp.X_add_number = 0;
- /* Fall through. */
- case O_constant:
- S_SET_SEGMENT (symbolP, absolute_section);
- #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
- if (ext)
- S_SET_EXTERNAL (symbolP);
- else
- S_CLEAR_EXTERNAL (symbolP);
- #endif /* OBJ_AOUT or OBJ_BOUT */
- S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
- symbolP->sy_frag = &zero_address_frag;
- break;
-
- case O_register:
- S_SET_SEGMENT (symbolP, reg_section);
- S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
- symbolP->sy_frag = &zero_address_frag;
- break;
-
- case O_symbol:
- if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section
- || exp.X_add_number != 0)
- symbolP->sy_value = exp;
- else
- {
- symbolS *s = exp.X_add_symbol;
-
- S_SET_SEGMENT (symbolP, S_GET_SEGMENT (s));
- #if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
- if (ext)
- S_SET_EXTERNAL (symbolP);
- else
- S_CLEAR_EXTERNAL (symbolP);
- #endif /* OBJ_AOUT or OBJ_BOUT */
- S_SET_VALUE (symbolP,
- exp.X_add_number + S_GET_VALUE (s));
- symbolP->sy_frag = s->sy_frag;
- copy_symbol_attributes (symbolP, s);
- }
- break;
-
- default:
- /* The value is some complex expression.
- FIXME: Should we set the segment to anything? */
- symbolP->sy_value = exp;
- break;
- }
- }
-
- /*
- * cons()
- *
- * CONStruct more frag of .bytes, or .words etc.
- * Should need_pass_2 be 1 then emit no frag(s).
- * This understands EXPRESSIONS.
- *
- * Bug (?)
- *
- * This has a split personality. We use expression() to read the
- * value. We can detect if the value won't fit in a byte or word.
- * But we can't detect if expression() discarded significant digits
- * in the case of a long. Not worth the crocks required to fix it.
- */
-
- /* Select a parser for cons expressions. */
-
- /* Some targets need to parse the expression in various fancy ways.
- You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
- (for example, the HPPA does this). Otherwise, you can define
- BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
- REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
- are defined, which is the normal case, then only simple expressions
- are permitted. */
-
- #ifndef TC_PARSE_CONS_EXPRESSION
- #ifdef BITFIELD_CONS_EXPRESSIONS
- #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
- static void
- parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
- #endif
- #ifdef MRI
- #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
- static void
- parse_mri_cons PARAMS ((expressionS *exp));
- #endif
- #ifdef REPEAT_CONS_EXPRESSIONS
- #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
- static void
- parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
- #endif
-
- /* If we haven't gotten one yet, just call expression. */
- #ifndef TC_PARSE_CONS_EXPRESSION
- #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
- #endif
- #endif
-
- /* worker to do .byte etc statements */
- /* clobbers input_line_pointer, checks */
- /* end-of-line. */
- void
- cons (nbytes)
- register int nbytes; /* 1=.byte, 2=.word, 4=.long */
- {
- expressionS exp;
-
- if (is_it_end_of_statement ())
- {
- demand_empty_rest_of_line ();
- return;
- }
-
- do
- {
- TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
- emit_expr (&exp, (unsigned int) nbytes);
- }
- while (*input_line_pointer++ == ',');
-
- input_line_pointer--; /* Put terminator back into stream. */
- demand_empty_rest_of_line ();
- }
-
- /* Put the contents of expression EXP into the object file using
- NBYTES bytes. If need_pass_2 is 1, this does nothing. */
-
- void
- emit_expr (exp, nbytes)
- expressionS *exp;
- unsigned int nbytes;
- {
- operatorT op;
- register char *p;
- valueT extra_digit = 0;
-
- /* Don't do anything if we are going to make another pass. */
- if (need_pass_2)
- return;
-
- op = exp->X_op;
-
- /* Handle a negative bignum. */
- if (op == O_uminus
- && exp->X_add_number == 0
- && exp->X_add_symbol->sy_value.X_op == O_big
- && exp->X_add_symbol->sy_value.X_add_number > 0)
- {
- int i;
- unsigned long carry;
-
- exp = &exp->X_add_symbol->sy_value;
-
- /* Negate the bignum: one's complement each digit and add 1. */
- carry = 1;
- for (i = 0; i < exp->X_add_number; i++)
- {
- unsigned long next;
-
- next = (((~ (generic_bignum[i] & LITTLENUM_MASK))
- & LITTLENUM_MASK)
- + carry);
- generic_bignum[i] = next & LITTLENUM_MASK;
- carry = next >> LITTLENUM_NUMBER_OF_BITS;
- }
-
- /* We can ignore any carry out, because it will be handled by
- extra_digit if it is needed. */
-
- extra_digit = (valueT) -1;
- op = O_big;
- }
-
- if (op == O_absent || op == O_illegal)
- {
- as_warn ("zero assumed for missing expression");
- exp->X_add_number = 0;
- op = O_constant;
- }
- else if (op == O_big && exp->X_add_number <= 0)
- {
- as_bad ("floating point number invalid; zero assumed");
- exp->X_add_number = 0;
- op = O_constant;
- }
- else if (op == O_register)
- {
- as_warn ("register value used as expression");
- op = O_constant;
- }
-
- p = frag_more ((int) nbytes);
-
- #ifndef WORKING_DOT_WORD
- /* If we have the difference of two symbols in a word, save it on
- the broken_words list. See the code in write.c. */
- if (op == O_subtract && nbytes == 2)
- {
- struct broken_word *x;
-
- x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
- x->next_broken_word = broken_words;
- broken_words = x;
- x->frag = frag_now;
- x->word_goes_here = p;
- x->dispfrag = 0;
- x->add = exp->X_add_symbol;
- x->sub = exp->X_op_symbol;
- x->addnum = exp->X_add_number;
- x->added = 0;
- new_broken_words++;
- return;
- }
- #endif
-
- /* If we have an integer, but the number of bytes is too large to
- pass to md_number_to_chars, handle it as a bignum. */
- if (op == O_constant && nbytes > sizeof (valueT))
- {
- valueT val;
- int gencnt;
-
- if (! exp->X_unsigned && exp->X_add_number < 0)
- extra_digit = (valueT) -1;
- val = (valueT) exp->X_add_number;
- gencnt = 0;
- do
- {
- generic_bignum[gencnt] = val & LITTLENUM_MASK;
- val >>= LITTLENUM_NUMBER_OF_BITS;
- ++gencnt;
- }
- while (val != 0);
- op = exp->X_op = O_big;
- exp->X_add_number = gencnt;
- }
-
- if (op == O_constant)
- {
- register valueT get;
- register valueT use;
- register valueT mask;
- register valueT unmask;
-
- /* JF << of >= number of bits in the object is undefined. In
- particular SPARC (Sun 4) has problems */
- if (nbytes >= sizeof (valueT))
- mask = 0;
- else
- mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
-
- unmask = ~mask; /* Do store these bits. */
-
- #ifdef NEVER
- "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
- mask = ~(unmask >> 1); /* Includes sign bit now. */
- #endif
-
- get = exp->X_add_number;
- use = get & unmask;
- if ((get & mask) != 0 && (get & mask) != mask)
- { /* Leading bits contain both 0s & 1s. */
- as_warn ("Value 0x%lx truncated to 0x%lx.", get, use);
- }
- /* put bytes in right order. */
- md_number_to_chars (p, use, (int) nbytes);
- }
- else if (op == O_big)
- {
- int size;
- LITTLENUM_TYPE *nums;
-
- know (nbytes % CHARS_PER_LITTLENUM == 0);
-
- size = exp->X_add_number * CHARS_PER_LITTLENUM;
- if (nbytes < size)
- {
- as_warn ("Bignum truncated to %d bytes", nbytes);
- size = nbytes;
- }
-
- if (target_big_endian)
- {
- while (nbytes > size)
- {
- md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
- nbytes -= CHARS_PER_LITTLENUM;
- p += CHARS_PER_LITTLENUM;
- }
-
- nums = generic_bignum + size / CHARS_PER_LITTLENUM;
- while (size > 0)
- {
- --nums;
- md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
- size -= CHARS_PER_LITTLENUM;
- p += CHARS_PER_LITTLENUM;
- }
- }
- else
- {
- nums = generic_bignum;
- while (size > 0)
- {
- md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
- ++nums;
- size -= CHARS_PER_LITTLENUM;
- p += CHARS_PER_LITTLENUM;
- nbytes -= CHARS_PER_LITTLENUM;
- }
-
- while (nbytes > 0)
- {
- md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
- nbytes -= CHARS_PER_LITTLENUM;
- p += CHARS_PER_LITTLENUM;
- }
- }
- }
- else
- {
- memset (p, 0, nbytes);
-
- /* Now we need to generate a fixS to record the symbol value.
- This is easy for BFD. For other targets it can be more
- complex. For very complex cases (currently, the HPPA and
- NS32K), you can define TC_CONS_FIX_NEW to do whatever you
- want. For simpler cases, you can define TC_CONS_RELOC to be
- the name of the reloc code that should be stored in the fixS.
- If neither is defined, the code uses NO_RELOC if it is
- defined, and otherwise uses 0. */
-
- #ifdef BFD_ASSEMBLER
- #ifdef TC_CONS_FIX_NEW
- TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
- #else
- fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
- /* @@ Should look at CPU word size. */
- nbytes == 2 ? BFD_RELOC_16
- : nbytes == 8 ? BFD_RELOC_64
- : BFD_RELOC_32);
- #endif
- #else
- #ifdef TC_CONS_FIX_NEW
- TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
- #else
- /* Figure out which reloc number to use. Use TC_CONS_RELOC if
- it is defined, otherwise use NO_RELOC if it is defined,
- otherwise use 0. */
- #ifndef TC_CONS_RELOC
- #ifdef NO_RELOC
- #define TC_CONS_RELOC NO_RELOC
- #else
- #define TC_CONS_RELOC 0
- #endif
- #endif
- fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
- TC_CONS_RELOC);
- #endif /* TC_CONS_FIX_NEW */
- #endif /* BFD_ASSEMBLER */
- }
- }
-
- #ifdef BITFIELD_CONS_EXPRESSIONS
-
- /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
- w:x,y:z, where w and y are bitwidths and x and y are values. They
- then pack them all together. We do a little better in that we allow
- them in words, longs, etc. and we'll pack them in target byte order
- for you.
-
- The rules are: pack least significat bit first, if a field doesn't
- entirely fit, put it in the next unit. Overflowing the bitfield is
- explicitly *not* even a warning. The bitwidth should be considered
- a "mask".
-
- To use this function the tc-XXX.h file should define
- BITFIELD_CONS_EXPRESSIONS. */
-
- static void
- parse_bitfield_cons (exp, nbytes)
- expressionS *exp;
- unsigned int nbytes;
- {
- unsigned int bits_available = BITS_PER_CHAR * nbytes;
- char *hold = input_line_pointer;
-
- (void) expression (exp);
-
- if (*input_line_pointer == ':')
- { /* bitfields */
- long value = 0;
-
- for (;;)
- {
- unsigned long width;
-
- if (*input_line_pointer != ':')
- {
- input_line_pointer = hold;
- break;
- } /* next piece is not a bitfield */
-
- /* In the general case, we can't allow
- full expressions with symbol
- differences and such. The relocation
- entries for symbols not defined in this
- assembly would require arbitrary field
- widths, positions, and masks which most
- of our current object formats don't
- support.
-
- In the specific case where a symbol
- *is* defined in this assembly, we
- *could* build fixups and track it, but
- this could lead to confusion for the
- backends. I'm lazy. I'll take any
- SEG_ABSOLUTE. I think that means that
- you can use a previous .set or
- .equ type symbol. xoxorich. */
-
- if (exp->X_op == O_absent)
- {
- as_warn ("using a bit field width of zero");
- exp->X_add_number = 0;
- exp->X_op = O_constant;
- } /* implied zero width bitfield */
-
- if (exp->X_op != O_constant)
- {
- *input_line_pointer = '\0';
- as_bad ("field width \"%s\" too complex for a bitfield", hold);
- *input_line_pointer = ':';
- demand_empty_rest_of_line ();
- return;
- } /* too complex */
-
- if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
- {
- as_warn ("field width %lu too big to fit in %d bytes: truncated to %d bits",
- width, nbytes, (BITS_PER_CHAR * nbytes));
- width = BITS_PER_CHAR * nbytes;
- } /* too big */
-
- if (width > bits_available)
- {
- /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
- input_line_pointer = hold;
- exp->X_add_number = value;
- break;
- } /* won't fit */
-
- hold = ++input_line_pointer; /* skip ':' */
-
- (void) expression (exp);
- if (exp->X_op != O_constant)
- {
- char cache = *input_line_pointer;
-
- *input_line_pointer = '\0';
- as_bad ("field value \"%s\" too complex for a bitfield", hold);
- *input_line_pointer = cache;
- demand_empty_rest_of_line ();
- return;
- } /* too complex */
-
- value |= ((~(-1 << width) & exp->X_add_number)
- << ((BITS_PER_CHAR * nbytes) - bits_available));
-
- if ((bits_available -= width) == 0
- || is_it_end_of_statement ()
- || *input_line_pointer != ',')
- {
- break;
- } /* all the bitfields we're gonna get */
-
- hold = ++input_line_pointer;
- (void) expression (exp);
- } /* forever loop */
-
- exp->X_add_number = value;
- exp->X_op = O_constant;
- exp->X_unsigned = 1;
- } /* if looks like a bitfield */
- } /* parse_bitfield_cons() */
-
- #endif /* BITFIELD_CONS_EXPRESSIONS */
-
- #ifdef MRI
-
- static void
- parse_mri_cons (exp, nbytes)
- expressionS *exp;
- unsigned int nbytes;
- {
- if (*input_line_pointer == '\'')
- {
- /* An MRI style string, cut into as many bytes as will fit into
- a nbyte chunk, left justify if necessary, and separate with
- commas so we can try again later */
- int scan = 0;
- unsigned int result = 0;
- input_line_pointer++;
- for (scan = 0; scan < nbytes; scan++)
- {
- if (*input_line_pointer == '\'')
- {
- if (input_line_pointer[1] == '\'')
- {
- input_line_pointer++;
- }
- else
- break;
- }
- result = (result << 8) | (*input_line_pointer++);
- }
-
- /* Left justify */
- while (scan < nbytes)
- {
- result <<= 8;
- scan++;
- }
- /* Create correct expression */
- exp->X_op = O_constant;
- exp->X_add_number = result;
- /* Fake it so that we can read the next char too */
- if (input_line_pointer[0] != '\'' ||
- (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
- {
- input_line_pointer -= 2;
- input_line_pointer[0] = ',';
- input_line_pointer[1] = '\'';
- }
- else
- input_line_pointer++;
- }
- else
- expression (&exp);
- }
-
- #endif /* MRI */
-
- #ifdef REPEAT_CONS_EXPRESSIONS
-
- /* Parse a repeat expression for cons. This is used by the MIPS
- assembler. The format is NUMBER:COUNT; NUMBER appears in the
- object file COUNT times.
-
- To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
-
- static void
- parse_repeat_cons (exp, nbytes)
- expressionS *exp;
- unsigned int nbytes;
- {
- expressionS count;
- register int i;
-
- expression (exp);
-
- if (*input_line_pointer != ':')
- {
- /* No repeat count. */
- return;
- }
-
- ++input_line_pointer;
- expression (&count);
- if (count.X_op != O_constant
- || count.X_add_number <= 0)
- {
- as_warn ("Unresolvable or nonpositive repeat count; using 1");
- return;
- }
-
- /* The cons function is going to output this expression once. So we
- output it count - 1 times. */
- for (i = count.X_add_number - 1; i > 0; i--)
- emit_expr (exp, nbytes);
- }
-
- #endif /* REPEAT_CONS_EXPRESSIONS */
-
- /*
- * float_cons()
- *
- * CONStruct some more frag chars of .floats .ffloats etc.
- * Makes 0 or more new frags.
- * If need_pass_2 == 1, no frags are emitted.
- * This understands only floating literals, not expressions. Sorry.
- *
- * A floating constant is defined by atof_generic(), except it is preceded
- * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
- * reading, I decided to be incompatible. This always tries to give you
- * rounded bits to the precision of the pseudo-op. Former AS did premature
- * truncatation, restored noisy bits instead of trailing 0s AND gave you
- * a choice of 2 flavours of noise according to which of 2 floating-point
- * scanners you directed AS to use.
- *
- * In: input_line_pointer->whitespace before, or '0' of flonum.
- *
- */
-
- void
- float_cons (float_type)
- /* Clobbers input_line-pointer, checks end-of-line. */
- register int float_type; /* 'f':.ffloat ... 'F':.float ... */
- {
- register char *p;
- int length; /* Number of chars in an object. */
- register char *err; /* Error from scanning floating literal. */
- char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
-
- if (is_it_end_of_statement ())
- {
- demand_empty_rest_of_line ();
- return;
- }
-
- do
- {
- /* input_line_pointer->1st char of a flonum (we hope!). */
- SKIP_WHITESPACE ();
-
- /* Skip any 0{letter} that may be present. Don't even check if the
- * letter is legal. Someone may invent a "z" format and this routine
- * has no use for such information. Lusers beware: you get
- * diagnostics if your input is ill-conditioned.
- */
- if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
- input_line_pointer += 2;
-
- err = md_atof (float_type, temp, &length);
- know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
- know (length > 0);
- if (err)
- {
- as_bad ("Bad floating literal: %s", err);
- ignore_rest_of_line ();
- return;
- }
-
- if (!need_pass_2)
- {
- int count;
-
- count = 1;
-
- #ifdef REPEAT_CONS_EXPRESSIONS
- if (*input_line_pointer == ':')
- {
- expressionS count_exp;
-
- ++input_line_pointer;
- expression (&count_exp);
- if (count_exp.X_op != O_constant
- || count_exp.X_add_number <= 0)
- {
- as_warn ("unresolvable or nonpositive repeat count; using 1");
- }
- else
- count = count_exp.X_add_number;
- }
- #endif
-
- while (--count >= 0)
- {
- p = frag_more (length);
- memcpy (p, temp, (unsigned int) length);
- }
- }
- SKIP_WHITESPACE ();
- }
- while (*input_line_pointer++ == ',');
-
- --input_line_pointer; /* Put terminator back into stream. */
- demand_empty_rest_of_line ();
- } /* float_cons() */
-
- /*
- * stringer()
- *
- * We read 0 or more ',' seperated, double-quoted strings.
- *
- * Caller should have checked need_pass_2 is FALSE because we don't check it.
- */
-
-
- void
- stringer (append_zero) /* Worker to do .ascii etc statements. */
- /* Checks end-of-line. */
- register int append_zero; /* 0: don't append '\0', else 1 */
- {
- register unsigned int c;
-
- /*
- * The following awkward logic is to parse ZERO or more strings,
- * comma seperated. Recall a string expression includes spaces
- * before the opening '\"' and spaces after the closing '\"'.
- * We fake a leading ',' if there is (supposed to be)
- * a 1st, expression. We keep demanding expressions for each
- * ','.
- */
- if (is_it_end_of_statement ())
- {
- c = 0; /* Skip loop. */
- ++input_line_pointer; /* Compensate for end of loop. */
- }
- else
- {
- c = ','; /* Do loop. */
- }
- while (c == ',' || c == '<' || c == '"')
- {
- SKIP_WHITESPACE ();
- switch (*input_line_pointer)
- {
- case '\"':
- ++input_line_pointer; /*->1st char of string. */
- while (is_a_char (c = next_char_of_string ()))
- {
- FRAG_APPEND_1_CHAR (c);
- }
- if (append_zero)
- {
- FRAG_APPEND_1_CHAR (0);
- }
- know (input_line_pointer[-1] == '\"');
- break;
- case '<':
- input_line_pointer++;
- c = get_single_number ();
- FRAG_APPEND_1_CHAR (c);
- if (*input_line_pointer != '>')
- {
- as_bad ("Expected <nn>");
- }
- input_line_pointer++;
- break;
- case ',':
- input_line_pointer++;
- break;
- }
- SKIP_WHITESPACE ();
- c = *input_line_pointer;
- }
-
- demand_empty_rest_of_line ();
- } /* stringer() */
-
- /* FIXME-SOMEDAY: I had trouble here on characters with the
- high bits set. We'll probably also have trouble with
- multibyte chars, wide chars, etc. Also be careful about
- returning values bigger than 1 byte. xoxorich. */
-
- unsigned int
- next_char_of_string ()
- {
- register unsigned int c;
-
- c = *input_line_pointer++ & CHAR_MASK;
- switch (c)
- {
- case '\"':
- c = NOT_A_CHAR;
- break;
-
- #ifndef NO_STRING_ESCAPES
- case '\\':
- switch (c = *input_line_pointer++)
- {
- case 'b':
- c = '\b';
- break;
-
- case 'f':
- c = '\f';
- break;
-
- case 'n':
- c = '\n';
- break;
-
- case 'r':
- c = '\r';
- break;
-
- case 't':
- c = '\t';
- break;
-
- #ifdef BACKSLASH_V
- case 'v':
- c = '\013';
- break;
- #endif
-
- case '\\':
- case '"':
- break; /* As itself. */
-
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- {
- long number;
- int i;
-
- for (i = 0, number = 0; isdigit (c) && i < 3; c = *input_line_pointer++, i++)
- {
- number = number * 8 + c - '0';
- }
- c = number & 0xff;
- }
- --input_line_pointer;
- break;
-
- case 'x':
- case 'X':
- {
- long number;
-
- number = 0;
- c = *input_line_pointer++;
- while (isxdigit (c))
- {
- if (isdigit (c))
- number = number * 16 + c - '0';
- else if (isupper (c))
- number = number * 16 + c - 'A' + 10;
- else
- number = number * 16 + c - 'a' + 10;
- c = *input_line_pointer++;
- }
- c = number & 0xff;
- --input_line_pointer;
- }
- break;
-
- case '\n':
- /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
- as_warn ("Unterminated string: Newline inserted.");
- c = '\n';
- break;
-
- default:
-
- #ifdef ONLY_STANDARD_ESCAPES
- as_bad ("Bad escaped character in string, '?' assumed");
- c = '?';
- #endif /* ONLY_STANDARD_ESCAPES */
-
- break;
- } /* switch on escaped char */
- break;
- #endif /* ! defined (NO_STRING_ESCAPES) */
-
- default:
- break;
- } /* switch on char */
- return (c);
- } /* next_char_of_string() */
-
- static segT
- get_segmented_expression (expP)
- register expressionS *expP;
- {
- register segT retval;
-
- retval = expression (expP);
- if (expP->X_op == O_illegal
- || expP->X_op == O_absent
- || expP->X_op == O_big)
- {
- as_bad ("expected address expression; zero assumed");
- expP->X_op = O_constant;
- expP->X_add_number = 0;
- retval = absolute_section;
- }
- return retval;
- }
-
- static segT
- get_known_segmented_expression (expP)
- register expressionS *expP;
- {
- register segT retval;
-
- if ((retval = get_segmented_expression (expP)) == undefined_section)
- {
- /* There is no easy way to extract the undefined symbol from the
- expression. */
- if (expP->X_add_symbol != NULL
- && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
- as_warn ("symbol \"%s\" undefined; zero assumed",
- S_GET_NAME (expP->X_add_symbol));
- else
- as_warn ("some symbol undefined; zero assumed");
- retval = absolute_section;
- expP->X_op = O_constant;
- expP->X_add_number = 0;
- }
- know (retval == absolute_section || SEG_NORMAL (retval));
- return (retval);
- } /* get_known_segmented_expression() */
-
- offsetT
- get_absolute_expression ()
- {
- expressionS exp;
-
- expression (&exp);
- if (exp.X_op != O_constant)
- {
- if (exp.X_op != O_absent)
- as_bad ("bad absolute expression; zero assumed");
- exp.X_add_number = 0;
- }
- return exp.X_add_number;
- }
-
- char /* return terminator */
- get_absolute_expression_and_terminator (val_pointer)
- long *val_pointer; /* return value of expression */
- {
- /* FIXME: val_pointer should probably be offsetT *. */
- *val_pointer = (long) get_absolute_expression ();
- return (*input_line_pointer++);
- }
-
- /*
- * demand_copy_C_string()
- *
- * Like demand_copy_string, but return NULL if the string contains any '\0's.
- * Give a warning if that happens.
- */
- char *
- demand_copy_C_string (len_pointer)
- int *len_pointer;
- {
- register char *s;
-
- if ((s = demand_copy_string (len_pointer)) != 0)
- {
- register int len;
-
- for (len = *len_pointer;
- len > 0;
- len--)
- {
- if (*s == 0)
- {
- s = 0;
- len = 1;
- *len_pointer = 0;
- as_bad ("This string may not contain \'\\0\'");
- }
- }
- }
- return (s);
- }
-
- /*
- * demand_copy_string()
- *
- * Demand string, but return a safe (=private) copy of the string.
- * Return NULL if we can't read a string here.
- */
- char *
- demand_copy_string (lenP)
- int *lenP;
- {
- register unsigned int c;
- register int len;
- char *retval;
-
- len = 0;
- SKIP_WHITESPACE ();
- if (*input_line_pointer == '\"')
- {
- input_line_pointer++; /* Skip opening quote. */
-
- while (is_a_char (c = next_char_of_string ()))
- {
- obstack_1grow (¬es, c);
- len++;
- }
- /* JF this next line is so demand_copy_C_string will return a null
- termanated string. */
- obstack_1grow (¬es, '\0');
- retval = obstack_finish (¬es);
- }
- else
- {
- as_warn ("Missing string");
- retval = NULL;
- ignore_rest_of_line ();
- }
- *lenP = len;
- return (retval);
- } /* demand_copy_string() */
-
- /*
- * is_it_end_of_statement()
- *
- * In: Input_line_pointer->next character.
- *
- * Do: Skip input_line_pointer over all whitespace.
- *
- * Out: 1 if input_line_pointer->end-of-line.
- */
- int
- is_it_end_of_statement ()
- {
- SKIP_WHITESPACE ();
- return (is_end_of_line[(unsigned char) *input_line_pointer]);
- } /* is_it_end_of_statement() */
-
- void
- equals (sym_name)
- char *sym_name;
- {
- register symbolS *symbolP; /* symbol we are working with */
-
- input_line_pointer++;
- if (*input_line_pointer == '=')
- input_line_pointer++;
-
- while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
- input_line_pointer++;
-
- if (sym_name[0] == '.' && sym_name[1] == '\0')
- {
- /* Turn '. = mumble' into a .org mumble */
- register segT segment;
- expressionS exp;
- register char *p;
-
- segment = get_known_segmented_expression (&exp);
- if (!need_pass_2)
- {
- if (segment != now_seg && segment != absolute_section)
- as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
- segment_name (segment),
- segment_name (now_seg));
- p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
- exp.X_add_number, (char *) 0);
- *p = 0;
- } /* if (ok to make frag) */
- }
- else
- {
- symbolP = symbol_find_or_make (sym_name);
- pseudo_set (symbolP);
- }
- } /* equals() */
-
- /* .include -- include a file at this point. */
-
- /* ARGSUSED */
- void
- s_include (arg)
- int arg;
- {
- char *newbuf;
- char *filename;
- int i;
- FILE *try;
- char *path;
-
- filename = demand_copy_string (&i);
- demand_empty_rest_of_line ();
- path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
- for (i = 0; i < include_dir_count; i++)
- {
- strcpy (path, include_dirs[i]);
- strcat (path, "/");
- strcat (path, filename);
- if (0 != (try = fopen (path, "r")))
- {
- fclose (try);
- goto gotit;
- }
- }
- free (path);
- path = filename;
- gotit:
- /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
- newbuf = input_scrub_include_file (path, input_line_pointer);
- buffer_limit = input_scrub_next_buffer (&input_line_pointer);
- } /* s_include() */
-
- void
- add_include_dir (path)
- char *path;
- {
- int i;
-
- if (include_dir_count == 0)
- {
- include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
- include_dirs[0] = "."; /* Current dir */
- include_dir_count = 2;
- }
- else
- {
- include_dir_count++;
- include_dirs = (char **) realloc (include_dirs,
- include_dir_count * sizeof (*include_dirs));
- }
-
- include_dirs[include_dir_count - 1] = path; /* New one */
-
- i = strlen (path);
- if (i > include_dir_maxlen)
- include_dir_maxlen = i;
- } /* add_include_dir() */
-
- void
- s_ignore (arg)
- int arg;
- {
- while (!is_end_of_line[(unsigned char) *input_line_pointer])
- {
- ++input_line_pointer;
- }
- ++input_line_pointer;
- }
-
-
- /* end of read.c */
-