293 lines
8.4 KiB
C
293 lines
8.4 KiB
C
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/* as.h - global header file
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Copyright (C) 1987 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef asH
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#define asH /* Don't declare things twice. */
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#if !defined(__STDC__) && !defined(const)
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#define const /* ignore */
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#endif
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#ifdef USG
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#define index strchr
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#define bzero(s,n) memset((s),0,(n))
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#define bcopy(from,to,n) memcpy((to),(from),(n))
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#define setbuffer(a,b,c)
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#endif
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/*
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* CAPITALISED names are #defined.
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* "lowercaseH" is #defined if "lowercase.h" has been #include-d.
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* "lowercaseT" is a typedef of "lowercase" objects.
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* "lowercaseP" is type "pointer to object of type 'lowercase'".
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* "lowercaseS" is typedef struct ... lowercaseS.
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*
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* #define SUSPECT when debugging.
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* #define DUMP to include data-structure dumpers.
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* #define COMMON as "extern" for all modules except one, where you #define
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* COMMON as "".
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* If TEST is #defined, then we are testing a module: #define COMMON as "".
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*/
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/* These #defines are for parameters of entire assembler. */
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/* #define SUSPECT JF remove for speed testing */
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/* #define DUMP */
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#define NDEBUG /* JF disable asserts */
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/* These #includes are for type definitions etc. */
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/* #include "style.h" */
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#include <stdio.h>
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#include <assert.h>
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#define obstack_chunk_alloc xmalloc
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#define obstack_chunk_free xfree
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/* These defines are potentially useful */
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#define FALSE (0)
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#define TRUE (!FALSE)
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#define ASSERT assert
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#define BAD_CASE(value) \
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{ \
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as_fatal ("Case value %d unexpected at line %d of file \"%s\"\n", \
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value, __LINE__, __FILE__); \
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}
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/* These are assembler-wide concepts */
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#ifndef COMMON
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#ifdef TEST
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#define COMMON /* declare our COMMONs storage here. */
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#else
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#define COMMON extern /* our commons live elswhere */
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#endif
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#endif
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/* COMMON now defined */
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#ifdef SUSPECT
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#define register /* no registers: helps debugging */
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#define know(p) ASSERT(p) /* know() is less ugly than #ifdef SUSPECT/ */
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/* assert()/#endif. */
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#else
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#define know(p) /* know() checks are no-op.ed */
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#endif /* #ifdef SUSPECT */
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char *xmalloc(); /* keep C compilers happy */
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char *xrealloc(); /* " */
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void free(); /* " */
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#define xfree free
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/* input_scrub.c */
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/*
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* Supplies sanitised buffers to read.c.
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* Also understands printing line-number part of error messages.
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*/
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/* Line number things. */
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int seen_at_least_1_file();
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void bump_line_counters();
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void new_logical_line();
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void as_where();
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void as_perror();
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void as_howmuch();
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/* Sanitising things. */
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void input_scrub_begin();
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void input_scrub_end();
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char *input_scrub_new_file();
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char *input_scrub_next_buffer();
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/* subsegs.c Sub-segments. Also, segment(=expression type)s.*/
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/*
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* This table describes the use of segments as EXPRESSION types.
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*
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* X_seg X_add_symbol X_subtract_symbol X_add_number
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* SEG_NONE no (legal) expression
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* SEG_PASS1 no (defined) "
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* SEG_BIG * > 32 bits const.
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* SEG_ABSOLUTE 0
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* SEG_DATA * 0
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* SEG_TEXT * 0
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* SEG_BSS * 0
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* SEG_UNKNOWN * 0
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* SEG_DIFFERENCE 0 * 0
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*
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* The blank fields MUST be 0, and are nugatory.
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* The '0' fields MAY be 0. The '*' fields MAY NOT be 0.
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*
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* SEG_BIG: X_add_number is < 0 if the result is in
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* generic_floating_point_number. The value is -'c' where c is the
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* character that introduced the constant. e.g. "0f6.9" will have -'f'
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* as a X_add_number value.
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* X_add_number > 0 is a count of how many littlenums it took to
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* represent a bignum.
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* SEG_DIFFERENCE:
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* If segments of both symbols are known, they are the same segment.
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* X_add_symbol != X_sub_symbol (then we just cancel them, => SEG_ABSOLUTE).
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*/
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typedef enum
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{
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SEG_ABSOLUTE,
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SEG_TEXT,
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SEG_DATA,
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SEG_BSS,
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SEG_UNKNOWN,
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SEG_NONE, /* Mythical Segment: NO expression seen. */
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SEG_PASS1, /* Mythical Segment: Need another pass. */
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SEG_GOOF, /* Only happens if AS has a logic error. */
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/* Invented so we don't crash printing */
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/* error message involving weird segment. */
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SEG_BIG, /* Bigger than 32 bits constant. */
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SEG_DIFFERENCE /* Mythical Segment: absolute difference. */
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} segT;
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#define SEG_MAXIMUM_ORDINAL (SEG_DIFFERENCE)
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typedef unsigned char subsegT;
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COMMON subsegT now_subseg;
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/* What subseg we are accreting now? */
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COMMON segT now_seg;
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/* Segment our instructions emit to. */
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/* Only OK values are SEG_TEXT or SEG_DATA. */
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extern char *const seg_name[];
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extern const int seg_N_TYPE[];
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extern const segT N_TYPE_seg[];
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void subsegs_begin();
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void subseg_change();
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void subseg_new();
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/* relax() */
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typedef enum
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{
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rs_fill, /* Variable chars to be repeated fr_offset */
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/* times. Fr_symbol unused. */
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/* Used with fr_offset == 0 for a constant */
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/* length frag. */
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rs_align, /* Align: Fr_offset: power of 2. */
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/* 1 variable char: fill character. */
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rs_org, /* Org: Fr_offset, fr_symbol: address. */
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/* 1 variable char: fill character. */
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rs_machine_dependent,
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#ifndef WORKING_DOT_WORD
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rs_broken_word, /* JF: gunpoint */
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#endif
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}
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relax_stateT;
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/* typedef unsigned char relax_substateT; */
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/* JF this is more likely to leave the end of a struct frag on an align
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boundry. Be very careful with this. */
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typedef unsigned long int relax_substateT;
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typedef unsigned long int relax_addressT;/* Enough bits for address. */
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/* Still an integer type. */
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/* frags.c */
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/*
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* A code fragment (frag) is some known number of chars, followed by some
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* unknown number of chars. Typically the unknown number of chars is an
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* instruction address whose size is yet unknown. We always know the greatest
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* possible size the unknown number of chars may become, and reserve that
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* much room at the end of the frag.
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* Once created, frags do not change address during assembly.
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* We chain the frags in (a) forward-linked list(s). The object-file address
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* of the 1st char of a frag is generally not known until after relax().
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* Many things at assembly time describe an address by {object-file-address
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* of a particular frag}+offset.
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BUG: it may be smarter to have a single pointer off to various different
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notes for different frag kinds. See how code pans out.
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*/
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struct frag /* a code fragment */
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{
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long unsigned int fr_address; /* Object file address. */
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struct frag *fr_next; /* Chain forward; ascending address order. */
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/* Rooted in frch_root. */
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long int fr_fix; /* (Fixed) number of chars we know we have. */
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/* May be 0. */
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long int fr_var; /* (Variable) number of chars after above. */
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/* May be 0. */
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struct symbol *fr_symbol; /* For variable-length tail. */
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long int fr_offset; /* For variable-length tail. */
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char *fr_opcode; /*->opcode low addr byte,for relax()ation*/
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relax_stateT fr_type; /* What state is my tail in? */
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relax_substateT fr_subtype;
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/* These are needed only on the NS32K machines */
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char fr_pcrel_adjust;
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char fr_bsr;
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char fr_literal [1]; /* Chars begin here. */
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/* One day we will compile fr_literal[0]. */
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};
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#define SIZEOF_STRUCT_FRAG \
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((int)zero_address_frag.fr_literal-(int)&zero_address_frag)
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/* We want to say fr_literal[0] above. */
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typedef struct frag fragS;
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COMMON fragS * frag_now; /* -> current frag we are building. */
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/* This frag is incomplete. */
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/* It is, however, included in frchain_now. */
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/* Frag_now->fr_fix is bogus. Use: */
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/* Virtual frag_now->fr_fix==obstack_next_free(&frags)-frag_now->fr_literal.*/
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COMMON fragS zero_address_frag; /* For foreign-segment symbol fixups. */
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COMMON fragS bss_address_frag; /* For local common (N_BSS segment) fixups. */
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void frag_new();
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char * frag_more();
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char * frag_var();
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void frag_wane();
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void frag_align();
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/* main program "as.c" (command arguments etc) */
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COMMON char
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flagseen[128]; /* ['x'] TRUE if "-x" seen. */
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COMMON char *
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out_file_name; /* name of emitted object file */
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COMMON int need_pass_2; /* TRUE if we need a second pass. */
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#endif /* #ifdef asH */
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/* end: as.h */
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