source: trunk/libs/newlib/src/include/opcode/cgen.h @ 507

Last change on this file since 507 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 50.6 KB
Line 
1/* Header file for targets using CGEN: Cpu tools GENerator.
2
3   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2009, 2010
4   Free Software Foundation, Inc.
5
6   This file is part of GDB, the GNU debugger, and the GNU Binutils.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 3 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License along
19   with this program; if not, write to the Free Software Foundation, Inc.,
20   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
21
22#ifndef OPCODE_CGEN_H
23#define OPCODE_CGEN_H
24
25#include "symcat.h"
26#include "cgen/bitset.h"
27
28/* ??? IWBN to replace bfd in the name.  */
29#include "bfd_stdint.h"
30
31/* ??? This file requires bfd.h but only to get bfd_vma.
32   Seems like an awful lot to require just to get such a fundamental type.
33   Perhaps the definition of bfd_vma can be moved outside of bfd.h.
34   Or perhaps one could duplicate its definition in another file.
35   Until such time, this file conditionally compiles definitions that require
36   bfd_vma using __BFD_H_SEEN__.  */
37
38/* Enums must be defined before they can be used.
39   Allow them to be used in struct definitions, even though the enum must
40   be defined elsewhere.
41   If CGEN_ARCH isn't defined, this file is being included by something other
42   than <arch>-desc.h.  */
43
44/* Prepend the arch name, defined in <arch>-desc.h, and _cgen_ to symbol S.
45   The lack of spaces in the arg list is important for non-stdc systems.
46   This file is included by <arch>-desc.h.
47   It can be included independently of <arch>-desc.h, in which case the arch
48   dependent portions will be declared as "unknown_cgen_foo".  */
49
50#ifndef CGEN_SYM
51#define CGEN_SYM(s) CONCAT3 (unknown,_cgen_,s)
52#endif
53
54/* This file contains the static (unchanging) pieces and as much other stuff
55   as we can reasonably put here.  It's generally cleaner to put stuff here
56   rather than having it machine generated if possible.  */
57
58/* The assembler syntax is made up of expressions (duh...).
59   At the lowest level the values are mnemonics, register names, numbers, etc.
60   Above that are subexpressions, if any (an example might be the
61   "effective address" in m68k cpus).  Subexpressions are wip.
62   At the second highest level are the insns themselves.  Above that are
63   pseudo-insns, synthetic insns, and macros, if any.  */
64
65/* Lots of cpu's have a fixed insn size, or one which rarely changes,
66   and it's generally easier to handle these by treating the insn as an
67   integer type, rather than an array of characters.  So we allow targets
68   to control this.  When an integer type the value is in host byte order,
69   when an array of characters the value is in target byte order.  */
70
71typedef unsigned int CGEN_INSN_INT;
72typedef int64_t CGEN_INSN_LGSINT; /* large/long SINT */
73typedef uint64_t CGEN_INSN_LGUINT; /* large/long UINT */
74
75#if CGEN_INT_INSN_P
76typedef CGEN_INSN_INT CGEN_INSN_BYTES;
77typedef CGEN_INSN_INT *CGEN_INSN_BYTES_PTR;
78#else
79typedef unsigned char *CGEN_INSN_BYTES;
80typedef unsigned char *CGEN_INSN_BYTES_PTR;
81#endif
82
83#ifdef __GNUC__
84#define CGEN_INLINE __inline__
85#else
86#define CGEN_INLINE
87#endif
88
89enum cgen_endian
90{
91  CGEN_ENDIAN_UNKNOWN,
92  CGEN_ENDIAN_LITTLE,
93  CGEN_ENDIAN_BIG
94};
95
96/* Forward decl.  */
97
98typedef struct cgen_insn CGEN_INSN;
99
100/* Opaque pointer version for use by external world.  */
101
102typedef struct cgen_cpu_desc *CGEN_CPU_DESC;
103
104/* Attributes.
105   Attributes are used to describe various random things associated with
106   an object (ifield, hardware, operand, insn, whatever) and are specified
107   as name/value pairs.
108   Integer attributes computed at compile time are currently all that's
109   supported, though adding string attributes and run-time computation is
110   straightforward.  Integer attribute values are always host int's
111   (signed or unsigned).  For portability, this means 32 bits.
112   Integer attributes are further categorized as boolean, bitset, integer,
113   and enum types.  Boolean attributes appear frequently enough that they're
114   recorded in one host int.  This limits the maximum number of boolean
115   attributes to 32, though that's a *lot* of attributes.  */
116
117/* Type of attribute values.  */
118
119typedef CGEN_BITSET     CGEN_ATTR_VALUE_BITSET_TYPE;
120typedef int             CGEN_ATTR_VALUE_ENUM_TYPE;
121typedef union
122{
123  CGEN_ATTR_VALUE_BITSET_TYPE bitset;
124  CGEN_ATTR_VALUE_ENUM_TYPE   nonbitset;
125} CGEN_ATTR_VALUE_TYPE;
126
127/* Struct to record attribute information.  */
128
129typedef struct
130{
131  /* Boolean attributes.  */
132  unsigned int bool_;
133  /* Non-boolean integer attributes.  */
134  CGEN_ATTR_VALUE_TYPE nonbool[1];
135} CGEN_ATTR;
136
137/* Define a structure member for attributes with N non-boolean entries.
138   There is no maximum number of non-boolean attributes.
139   There is a maximum of 32 boolean attributes (since they are all recorded
140   in one host int).  */
141
142#define CGEN_ATTR_TYPE(n) \
143struct { unsigned int bool_; \
144         CGEN_ATTR_VALUE_TYPE nonbool[(n) ? (n) : 1]; }
145
146/* Return the boolean attributes.  */
147
148#define CGEN_ATTR_BOOLS(a) ((a)->bool_)
149
150/* Non-boolean attribute numbers are offset by this much.  */
151
152#define CGEN_ATTR_NBOOL_OFFSET 32
153
154/* Given a boolean attribute number, return its mask.  */
155
156#define CGEN_ATTR_MASK(attr) (1 << (attr))
157
158/* Return the value of boolean attribute ATTR in ATTRS.  */
159
160#define CGEN_BOOL_ATTR(attrs, attr) ((CGEN_ATTR_MASK (attr) & (attrs)) != 0)
161
162/* Return value of attribute ATTR in ATTR_TABLE for OBJ.
163   OBJ is a pointer to the entity that has the attributes
164   (??? not used at present but is reserved for future purposes - eventually
165   the goal is to allow recording attributes in source form and computing
166   them lazily at runtime, not sure of the details yet).  */
167
168#define CGEN_ATTR_VALUE(obj, attr_table, attr) \
169((unsigned int) (attr) < CGEN_ATTR_NBOOL_OFFSET \
170 ? ((CGEN_ATTR_BOOLS (attr_table) & CGEN_ATTR_MASK (attr)) != 0) \
171 : ((attr_table)->nonbool[(attr) - CGEN_ATTR_NBOOL_OFFSET].nonbitset))
172#define CGEN_BITSET_ATTR_VALUE(obj, attr_table, attr) \
173 ((attr_table)->nonbool[(attr) - CGEN_ATTR_NBOOL_OFFSET].bitset)
174
175/* Attribute name/value tables.
176   These are used to assist parsing of descriptions at run-time.  */
177
178typedef struct
179{
180  const char * name;
181  unsigned value;
182} CGEN_ATTR_ENTRY;
183
184/* For each domain (ifld,hw,operand,insn), list of attributes.  */
185
186typedef struct
187{
188  const char * name;
189  const CGEN_ATTR_ENTRY * dfault;
190  const CGEN_ATTR_ENTRY * vals;
191} CGEN_ATTR_TABLE;
192
193/* Instruction set variants.  */
194
195typedef struct {
196  const char *name;
197
198  /* Default instruction size (in bits).
199     This is used by the assembler when it encounters an unknown insn.  */
200  unsigned int default_insn_bitsize;
201
202  /* Base instruction size (in bits).
203     For non-LIW cpus this is generally the length of the smallest insn.
204     For LIW cpus its wip (work-in-progress).  For the m32r its 32.  */
205  unsigned int base_insn_bitsize;
206
207  /* Minimum/maximum instruction size (in bits).  */
208  unsigned int min_insn_bitsize;
209  unsigned int max_insn_bitsize;
210} CGEN_ISA;
211
212/* Machine variants.  */
213
214typedef struct {
215  const char *name;
216  /* The argument to bfd_arch_info->scan.  */
217  const char *bfd_name;
218  /* one of enum mach_attr */
219  int num;
220  /* parameter from mach->cpu */
221  unsigned int insn_chunk_bitsize;
222} CGEN_MACH;
223
224/* Parse result (also extraction result).
225
226   The result of parsing an insn is stored here.
227   To generate the actual insn, this is passed to the insert handler.
228   When printing an insn, the result of extraction is stored here.
229   To print the insn, this is passed to the print handler.
230
231   It is machine generated so we don't define it here,
232   but we do need a forward decl for the handler fns.
233
234   There is one member for each possible field in the insn.
235   The type depends on the field.
236   Also recorded here is the computed length of the insn for architectures
237   where it varies.
238*/
239
240typedef struct cgen_fields CGEN_FIELDS;
241
242/* Total length of the insn, as recorded in the `fields' struct.  */
243/* ??? The field insert handler has lots of opportunities for optimization
244   if it ever gets inlined.  On architectures where insns all have the same
245   size, may wish to detect that and make this macro a constant - to allow
246   further optimizations.  */
247
248#define CGEN_FIELDS_BITSIZE(fields) ((fields)->length)
249
250/* Extraction support for variable length insn sets.  */
251
252/* When disassembling we don't know the number of bytes to read at the start.
253   So the first CGEN_BASE_INSN_SIZE bytes are read at the start and the rest
254   are read when needed.  This struct controls this.  It is basically the
255   disassemble_info stuff, except that we provide a cache for values already
256   read (since bytes can typically be read several times to fetch multiple
257   operands that may be in them), and that extraction of fields is needed
258   in contexts other than disassembly.  */
259
260typedef struct {
261  /* A pointer to the disassemble_info struct.
262     We don't require dis-asm.h so we use void * for the type here.
263     If NULL, BYTES is full of valid data (VALID == -1).  */
264  void *dis_info;
265  /* Points to a working buffer of sufficient size.  */
266  unsigned char *insn_bytes;
267  /* Mask of bytes that are valid in INSN_BYTES.  */
268  unsigned int valid;
269} CGEN_EXTRACT_INFO;
270
271/* Associated with each insn or expression is a set of "handlers" for
272   performing operations like parsing, printing, etc.  These require a bfd_vma
273   value to be passed around but we don't want all applications to need bfd.h.
274   So this stuff is only provided if bfd.h has been included.  */
275
276/* Parse handler.
277   CD is a cpu table descriptor.
278   INSN is a pointer to a struct describing the insn being parsed.
279   STRP is a pointer to a pointer to the text being parsed.
280   FIELDS is a pointer to a cgen_fields struct in which the results are placed.
281   If the expression is successfully parsed, *STRP is updated.
282   If not it is left alone.
283   The result is NULL if success or an error message.  */
284typedef const char * (cgen_parse_fn)
285  (CGEN_CPU_DESC, const CGEN_INSN *insn_,
286   const char **strp_, CGEN_FIELDS *fields_);
287
288/* Insert handler.
289   CD is a cpu table descriptor.
290   INSN is a pointer to a struct describing the insn being parsed.
291   FIELDS is a pointer to a cgen_fields struct from which the values
292   are fetched.
293   INSNP is a pointer to a buffer in which to place the insn.
294   PC is the pc value of the insn.
295   The result is an error message or NULL if success.  */
296
297#ifdef __BFD_H_SEEN__
298typedef const char * (cgen_insert_fn)
299  (CGEN_CPU_DESC, const CGEN_INSN *insn_,
300   CGEN_FIELDS *fields_, CGEN_INSN_BYTES_PTR insnp_,
301   bfd_vma pc_);
302#else
303typedef const char * (cgen_insert_fn) ();
304#endif
305
306/* Extract handler.
307   CD is a cpu table descriptor.
308   INSN is a pointer to a struct describing the insn being parsed.
309   The second argument is a pointer to a struct controlling extraction
310   (only used for variable length insns).
311   EX_INFO is a pointer to a struct for controlling reading of further
312   bytes for the insn.
313   BASE_INSN is the first CGEN_BASE_INSN_SIZE bytes (host order).
314   FIELDS is a pointer to a cgen_fields struct in which the results are placed.
315   PC is the pc value of the insn.
316   The result is the length of the insn in bits or zero if not recognized.  */
317
318#ifdef __BFD_H_SEEN__
319typedef int (cgen_extract_fn)
320  (CGEN_CPU_DESC, const CGEN_INSN *insn_,
321   CGEN_EXTRACT_INFO *ex_info_, CGEN_INSN_INT base_insn_,
322   CGEN_FIELDS *fields_, bfd_vma pc_);
323#else
324typedef int (cgen_extract_fn) ();
325#endif
326
327/* Print handler.
328   CD is a cpu table descriptor.
329   INFO is a pointer to the disassembly info.
330   Eg: disassemble_info.  It's defined as `PTR' so this file can be included
331   without dis-asm.h.
332   INSN is a pointer to a struct describing the insn being printed.
333   FIELDS is a pointer to a cgen_fields struct.
334   PC is the pc value of the insn.
335   LEN is the length of the insn, in bits.  */
336
337#ifdef __BFD_H_SEEN__
338typedef void (cgen_print_fn)
339  (CGEN_CPU_DESC, void * info_, const CGEN_INSN *insn_,
340   CGEN_FIELDS *fields_, bfd_vma pc_, int len_);
341#else
342typedef void (cgen_print_fn) ();
343#endif
344
345/* Parse/insert/extract/print handlers.
346
347   Indices into the handler tables.
348   We could use pointers here instead, but 90% of them are generally identical
349   and that's a lot of redundant data.  Making these unsigned char indices
350   into tables of pointers saves a bit of space.
351   Using indices also keeps assembler code out of the disassembler and
352   vice versa.  */
353
354struct cgen_opcode_handler
355{
356  unsigned char parse, insert, extract, print;
357};
358
359/* Assembler interface.
360
361   The interface to the assembler is intended to be clean in the sense that
362   libopcodes.a is a standalone entity and could be used with any assembler.
363   Not that one would necessarily want to do that but rather that it helps
364   keep a clean interface.  The interface will obviously be slanted towards
365   GAS, but at least it's a start.
366   ??? Note that one possible user of the assembler besides GAS is GDB.
367
368   Parsing is controlled by the assembler which calls
369   CGEN_SYM (assemble_insn).  If it can parse and build the entire insn
370   it doesn't call back to the assembler.  If it needs/wants to call back
371   to the assembler, cgen_parse_operand_fn is called which can either
372
373   - return a number to be inserted in the insn
374   - return a "register" value to be inserted
375     (the register might not be a register per pe)
376   - queue the argument and return a marker saying the expression has been
377     queued (eg: a fix-up)
378   - return an error message indicating the expression wasn't recognizable
379
380   The result is an error message or NULL for success.
381   The parsed value is stored in the bfd_vma *.  */
382
383/* Values for indicating what the caller wants.  */
384
385enum cgen_parse_operand_type
386{
387  CGEN_PARSE_OPERAND_INIT,
388  CGEN_PARSE_OPERAND_INTEGER,
389  CGEN_PARSE_OPERAND_ADDRESS,
390  CGEN_PARSE_OPERAND_SYMBOLIC
391};
392
393/* Values for indicating what was parsed.  */
394
395enum cgen_parse_operand_result
396{
397  CGEN_PARSE_OPERAND_RESULT_NUMBER,
398  CGEN_PARSE_OPERAND_RESULT_REGISTER,
399  CGEN_PARSE_OPERAND_RESULT_QUEUED,
400  CGEN_PARSE_OPERAND_RESULT_ERROR
401};
402
403#ifdef __BFD_H_SEEN__ /* Don't require bfd.h unnecessarily.  */
404typedef const char * (cgen_parse_operand_fn)
405  (CGEN_CPU_DESC,
406   enum cgen_parse_operand_type, const char **, int, int,
407   enum cgen_parse_operand_result *, bfd_vma *);
408#else
409typedef const char * (cgen_parse_operand_fn) ();
410#endif
411
412/* Set the cgen_parse_operand_fn callback.  */
413
414extern void cgen_set_parse_operand_fn
415  (CGEN_CPU_DESC, cgen_parse_operand_fn);
416
417/* Called before trying to match a table entry with the insn.  */
418
419extern void cgen_init_parse_operand (CGEN_CPU_DESC);
420
421/* Operand values (keywords, integers, symbols, etc.)  */
422
423/* Types of assembler elements.  */
424
425enum cgen_asm_type
426{
427  CGEN_ASM_NONE, CGEN_ASM_KEYWORD, CGEN_ASM_MAX
428};
429
430#ifndef CGEN_ARCH
431enum cgen_hw_type { CGEN_HW_MAX };
432#endif
433
434/* List of hardware elements.  */
435
436typedef struct
437{
438  char *name;
439  enum cgen_hw_type type;
440  /* There is currently no example where both index specs and value specs
441     are required, so for now both are clumped under "asm_data".  */
442  enum cgen_asm_type asm_type;
443  void *asm_data;
444#ifndef CGEN_HW_NBOOL_ATTRS
445#define CGEN_HW_NBOOL_ATTRS 1
446#endif
447  CGEN_ATTR_TYPE (CGEN_HW_NBOOL_ATTRS) attrs;
448#define CGEN_HW_ATTRS(hw) (&(hw)->attrs)
449} CGEN_HW_ENTRY;
450
451/* Return value of attribute ATTR in HW.  */
452
453#define CGEN_HW_ATTR_VALUE(hw, attr) \
454CGEN_ATTR_VALUE ((hw), CGEN_HW_ATTRS (hw), (attr))
455
456/* Table of hardware elements for selected mach, computed at runtime.
457   enum cgen_hw_type is an index into this table (specifically `entries').  */
458
459typedef struct {
460  /* Pointer to null terminated table of all compiled in entries.  */
461  const CGEN_HW_ENTRY *init_entries;
462  unsigned int entry_size; /* since the attribute member is variable sized */
463  /* Array of all entries, initial and run-time added.  */
464  const CGEN_HW_ENTRY **entries;
465  /* Number of elements in `entries'.  */
466  unsigned int num_entries;
467  /* For now, xrealloc is called each time a new entry is added at runtime.
468     ??? May wish to keep track of some slop to reduce the number of calls to
469     xrealloc, except that there's unlikely to be many and not expected to be
470     in speed critical code.  */
471} CGEN_HW_TABLE;
472
473extern const CGEN_HW_ENTRY * cgen_hw_lookup_by_name
474  (CGEN_CPU_DESC, const char *);
475extern const CGEN_HW_ENTRY * cgen_hw_lookup_by_num
476  (CGEN_CPU_DESC, unsigned int);
477
478/* This struct is used to describe things like register names, etc.  */
479
480typedef struct cgen_keyword_entry
481{
482  /* Name (as in register name).  */
483  char * name;
484
485  /* Value (as in register number).
486     The value cannot be -1 as that is used to indicate "not found".
487     IDEA: Have "FUNCTION" attribute? [function is called to fetch value].  */
488  int value;
489
490  /* Attributes.
491     This should, but technically needn't, appear last.  It is a variable sized
492     array in that one architecture may have 1 nonbool attribute and another
493     may have more.  Having this last means the non-architecture specific code
494     needn't care.  The goal is to eventually record
495     attributes in their raw form, evaluate them at run-time, and cache the
496     values, so this worry will go away anyway.  */
497  /* ??? Moving this last should be done by treating keywords like insn lists
498     and moving the `next' fields into a CGEN_KEYWORD_LIST struct.  */
499  /* FIXME: Not used yet.  */
500#ifndef CGEN_KEYWORD_NBOOL_ATTRS
501#define CGEN_KEYWORD_NBOOL_ATTRS 1
502#endif
503  CGEN_ATTR_TYPE (CGEN_KEYWORD_NBOOL_ATTRS) attrs;
504
505  /* ??? Putting these here means compiled in entries can't be const.
506     Not a really big deal, but something to consider.  */
507  /* Next name hash table entry.  */
508  struct cgen_keyword_entry *next_name;
509  /* Next value hash table entry.  */
510  struct cgen_keyword_entry *next_value;
511} CGEN_KEYWORD_ENTRY;
512
513/* Top level struct for describing a set of related keywords
514   (e.g. register names).
515
516   This struct supports run-time entry of new values, and hashed lookups.  */
517
518typedef struct cgen_keyword
519{
520  /* Pointer to initial [compiled in] values.  */
521  CGEN_KEYWORD_ENTRY *init_entries;
522 
523  /* Number of entries in `init_entries'.  */
524  unsigned int num_init_entries;
525 
526  /* Hash table used for name lookup.  */
527  CGEN_KEYWORD_ENTRY **name_hash_table;
528 
529  /* Hash table used for value lookup.  */
530  CGEN_KEYWORD_ENTRY **value_hash_table;
531 
532  /* Number of entries in the hash_tables.  */
533  unsigned int hash_table_size;
534 
535  /* Pointer to null keyword "" entry if present.  */
536  const CGEN_KEYWORD_ENTRY *null_entry;
537
538  /* String containing non-alphanumeric characters used
539     in keywords. 
540     At present, the highest number of entries used is 1.  */
541  char nonalpha_chars[8];
542} CGEN_KEYWORD;
543
544/* Structure used for searching.  */
545
546typedef struct
547{
548  /* Table being searched.  */
549  const CGEN_KEYWORD *table;
550 
551  /* Specification of what is being searched for.  */
552  const char *spec;
553 
554  /* Current index in hash table.  */
555  unsigned int current_hash;
556 
557  /* Current element in current hash chain.  */
558  CGEN_KEYWORD_ENTRY *current_entry;
559} CGEN_KEYWORD_SEARCH;
560
561/* Lookup a keyword from its name.  */
562
563const CGEN_KEYWORD_ENTRY *cgen_keyword_lookup_name
564  (CGEN_KEYWORD *, const char *);
565
566/* Lookup a keyword from its value.  */
567
568const CGEN_KEYWORD_ENTRY *cgen_keyword_lookup_value
569  (CGEN_KEYWORD *, int);
570
571/* Add a keyword.  */
572
573void cgen_keyword_add (CGEN_KEYWORD *, CGEN_KEYWORD_ENTRY *);
574
575/* Keyword searching.
576   This can be used to retrieve every keyword, or a subset.  */
577
578CGEN_KEYWORD_SEARCH cgen_keyword_search_init
579  (CGEN_KEYWORD *, const char *);
580const CGEN_KEYWORD_ENTRY *cgen_keyword_search_next
581  (CGEN_KEYWORD_SEARCH *);
582
583/* Operand value support routines.  */
584
585extern const char *cgen_parse_keyword
586  (CGEN_CPU_DESC, const char **, CGEN_KEYWORD *, long *);
587#ifdef __BFD_H_SEEN__ /* Don't require bfd.h unnecessarily.  */
588extern const char *cgen_parse_signed_integer
589  (CGEN_CPU_DESC, const char **, int, long *);
590extern const char *cgen_parse_unsigned_integer
591  (CGEN_CPU_DESC, const char **, int, unsigned long *);
592extern const char *cgen_parse_address
593  (CGEN_CPU_DESC, const char **, int, int,
594   enum cgen_parse_operand_result *, bfd_vma *);
595extern const char *cgen_validate_signed_integer
596  (long, long, long);
597extern const char *cgen_validate_unsigned_integer
598  (unsigned long, unsigned long, unsigned long);
599#endif
600
601/* Operand modes.  */
602
603/* ??? This duplicates the values in arch.h.  Revisit.
604   These however need the CGEN_ prefix [as does everything in this file].  */
605/* ??? Targets may need to add their own modes so we may wish to move this
606   to <arch>-opc.h, or add a hook.  */
607
608enum cgen_mode {
609  CGEN_MODE_VOID, /* ??? rename simulator's VM to VOID? */
610  CGEN_MODE_BI, CGEN_MODE_QI, CGEN_MODE_HI, CGEN_MODE_SI, CGEN_MODE_DI,
611  CGEN_MODE_UBI, CGEN_MODE_UQI, CGEN_MODE_UHI, CGEN_MODE_USI, CGEN_MODE_UDI,
612  CGEN_MODE_SF, CGEN_MODE_DF, CGEN_MODE_XF, CGEN_MODE_TF,
613  CGEN_MODE_TARGET_MAX,
614  CGEN_MODE_INT, CGEN_MODE_UINT,
615  CGEN_MODE_MAX
616};
617
618/* FIXME: Until simulator is updated.  */
619
620#define CGEN_MODE_VM CGEN_MODE_VOID
621
622/* Operands.  */
623
624#ifndef CGEN_ARCH
625enum cgen_operand_type { CGEN_OPERAND_MAX };
626#endif
627
628/* "nil" indicator for the operand instance table */
629#define CGEN_OPERAND_NIL CGEN_OPERAND_MAX
630
631/* A tree of these structs represents the multi-ifield
632   structure of an operand's hw-index value, if it exists.  */
633
634struct cgen_ifld;
635
636typedef struct cgen_maybe_multi_ifield
637{
638  int count; /* 0: indexed by single cgen_ifld (possibly null: dead entry);
639                n: indexed by array of more cgen_maybe_multi_ifields.  */
640  union
641  {
642    const void *p;
643    const struct cgen_maybe_multi_ifield * multi;
644    const struct cgen_ifld * leaf;
645  } val;
646}
647CGEN_MAYBE_MULTI_IFLD;
648
649/* This struct defines each entry in the operand table.  */
650
651typedef struct
652{
653  /* Name as it appears in the syntax string.  */
654  char *name;
655
656  /* Operand type.  */
657  enum cgen_operand_type type;
658
659  /* The hardware element associated with this operand.  */
660  enum cgen_hw_type hw_type;
661
662  /* FIXME: We don't yet record ifield definitions, which we should.
663     When we do it might make sense to delete start/length (since they will
664     be duplicated in the ifield's definition) and replace them with a
665     pointer to the ifield entry.  */
666
667  /* Bit position.
668     This is just a hint, and may be unused in more complex operands.
669     May be unused for a modifier.  */
670  unsigned char start;
671
672  /* The number of bits in the operand.
673     This is just a hint, and may be unused in more complex operands.
674     May be unused for a modifier.  */
675  unsigned char length;
676
677  /* The (possibly-multi) ifield used as an index for this operand, if it
678     is indexed by a field at all. This substitutes / extends the start and
679     length fields above, but unsure at this time whether they are used
680     anywhere.  */
681  CGEN_MAYBE_MULTI_IFLD index_fields;
682#if 0 /* ??? Interesting idea but relocs tend to get too complicated,
683         and ABI dependent, for simple table lookups to work.  */
684  /* Ideally this would be the internal (external?) reloc type.  */
685  int reloc_type;
686#endif
687
688  /* Attributes.
689     This should, but technically needn't, appear last.  It is a variable sized
690     array in that one architecture may have 1 nonbool attribute and another
691     may have more.  Having this last means the non-architecture specific code
692     needn't care, now or tomorrow.  The goal is to eventually record
693     attributes in their raw form, evaluate them at run-time, and cache the
694     values, so this worry will go away anyway.  */
695#ifndef CGEN_OPERAND_NBOOL_ATTRS
696#define CGEN_OPERAND_NBOOL_ATTRS 1
697#endif
698  CGEN_ATTR_TYPE (CGEN_OPERAND_NBOOL_ATTRS) attrs;
699#define CGEN_OPERAND_ATTRS(operand) (&(operand)->attrs)
700} CGEN_OPERAND;
701
702/* Return value of attribute ATTR in OPERAND.  */
703
704#define CGEN_OPERAND_ATTR_VALUE(operand, attr) \
705CGEN_ATTR_VALUE ((operand), CGEN_OPERAND_ATTRS (operand), (attr))
706
707/* Table of operands for selected mach/isa, computed at runtime.
708   enum cgen_operand_type is an index into this table (specifically
709   `entries').  */
710
711typedef struct {
712  /* Pointer to null terminated table of all compiled in entries.  */
713  const CGEN_OPERAND *init_entries;
714  unsigned int entry_size; /* since the attribute member is variable sized */
715  /* Array of all entries, initial and run-time added.  */
716  const CGEN_OPERAND **entries;
717  /* Number of elements in `entries'.  */
718  unsigned int num_entries;
719  /* For now, xrealloc is called each time a new entry is added at runtime.
720     ??? May wish to keep track of some slop to reduce the number of calls to
721     xrealloc, except that there's unlikely to be many and not expected to be
722     in speed critical code.  */
723} CGEN_OPERAND_TABLE;
724
725extern const CGEN_OPERAND * cgen_operand_lookup_by_name
726  (CGEN_CPU_DESC, const char *);
727extern const CGEN_OPERAND * cgen_operand_lookup_by_num
728  (CGEN_CPU_DESC, int);
729
730/* Instruction operand instances.
731
732   For each instruction, a list of the hardware elements that are read and
733   written are recorded.  */
734
735/* The type of the instance.  */
736
737enum cgen_opinst_type {
738  /* End of table marker.  */
739  CGEN_OPINST_END = 0,
740  CGEN_OPINST_INPUT, CGEN_OPINST_OUTPUT
741};
742
743typedef struct
744{
745  /* Input or output indicator.  */
746  enum cgen_opinst_type type;
747
748  /* Name of operand.  */
749  const char *name;
750
751  /* The hardware element referenced.  */
752  enum cgen_hw_type hw_type;
753
754  /* The mode in which the operand is being used.  */
755  enum cgen_mode mode;
756
757  /* The operand table entry CGEN_OPERAND_NIL if there is none
758     (i.e. an explicit hardware reference).  */
759  enum cgen_operand_type op_type;
760
761  /* If `operand' is "nil", the index (e.g. into array of registers).  */
762  int index;
763
764  /* Attributes.
765     ??? This perhaps should be a real attribute struct but there's
766     no current need, so we save a bit of space and just have a set of
767     flags.  The interface is such that this can easily be made attributes
768     should it prove useful.  */
769  unsigned int attrs;
770#define CGEN_OPINST_ATTRS(opinst) ((opinst)->attrs)
771/* Return value of attribute ATTR in OPINST.  */
772#define CGEN_OPINST_ATTR(opinst, attr) \
773((CGEN_OPINST_ATTRS (opinst) & (attr)) != 0)
774/* Operand is conditionally referenced (read/written).  */
775#define CGEN_OPINST_COND_REF 1
776} CGEN_OPINST;
777
778/* Syntax string.
779
780   Each insn format and subexpression has one of these.
781
782   The syntax "string" consists of characters (n > 0 && n < 128), and operand
783   values (n >= 128), and is terminated by 0.  Operand values are 128 + index
784   into the operand table.  The operand table doesn't exist in C, per se, as
785   the data is recorded in the parse/insert/extract/print switch statements. */
786
787/* This should be at least as large as necessary for any target. */
788#define CGEN_MAX_SYNTAX_ELEMENTS 48
789
790/* A target may know its own precise maximum.  Assert that it falls below
791   the above limit. */
792#ifdef CGEN_ACTUAL_MAX_SYNTAX_ELEMENTS
793#if CGEN_ACTUAL_MAX_SYNTAX_ELEMENTS > CGEN_MAX_SYNTAX_ELEMENTS
794#error "CGEN_ACTUAL_MAX_SYNTAX_ELEMENTS too high - enlarge CGEN_MAX_SYNTAX_ELEMENTS"
795#endif
796#endif
797
798typedef unsigned short CGEN_SYNTAX_CHAR_TYPE;
799
800typedef struct
801{
802  CGEN_SYNTAX_CHAR_TYPE syntax[CGEN_MAX_SYNTAX_ELEMENTS];
803} CGEN_SYNTAX;
804
805#define CGEN_SYNTAX_STRING(syn) (syn->syntax)
806#define CGEN_SYNTAX_CHAR_P(c) ((c) < 128)
807#define CGEN_SYNTAX_CHAR(c) ((unsigned char)c)
808#define CGEN_SYNTAX_FIELD(c) ((c) - 128)
809#define CGEN_SYNTAX_MAKE_FIELD(c) ((c) + 128)
810
811/* ??? I can't currently think of any case where the mnemonic doesn't come
812   first [and if one ever doesn't building the hash tables will be tricky].
813   However, we treat mnemonics as just another operand of the instruction.
814   A value of 1 means "this is where the mnemonic appears".  1 isn't
815   special other than it's a non-printable ASCII char.  */
816
817#define CGEN_SYNTAX_MNEMONIC       1
818#define CGEN_SYNTAX_MNEMONIC_P(ch) ((ch) == CGEN_SYNTAX_MNEMONIC)
819
820/* Instruction fields.
821
822   ??? We currently don't allow adding fields at run-time.
823   Easy to fix when needed.  */
824
825typedef struct cgen_ifld {
826  /* Enum of ifield.  */
827  int num;
828#define CGEN_IFLD_NUM(f) ((f)->num)
829
830  /* Name of the field, distinguishes it from all other fields.  */
831  const char *name;
832#define CGEN_IFLD_NAME(f) ((f)->name)
833
834  /* Default offset, in bits, from the start of the insn to the word
835     containing the field.  */
836  int word_offset;
837#define CGEN_IFLD_WORD_OFFSET(f) ((f)->word_offset)
838
839  /* Default length of the word containing the field.  */
840  int word_size;
841#define CGEN_IFLD_WORD_SIZE(f) ((f)->word_size)
842
843  /* Default starting bit number.
844     Whether lsb=0 or msb=0 is determined by CGEN_INSN_LSB0_P.  */
845  int start;
846#define CGEN_IFLD_START(f) ((f)->start)
847
848  /* Length of the field, in bits.  */
849  int length;
850#define CGEN_IFLD_LENGTH(f) ((f)->length)
851
852#ifndef CGEN_IFLD_NBOOL_ATTRS
853#define CGEN_IFLD_NBOOL_ATTRS 1
854#endif
855  CGEN_ATTR_TYPE (CGEN_IFLD_NBOOL_ATTRS) attrs;
856#define CGEN_IFLD_ATTRS(f) (&(f)->attrs)
857} CGEN_IFLD;
858
859/* Return value of attribute ATTR in IFLD.  */
860#define CGEN_IFLD_ATTR_VALUE(ifld, attr) \
861CGEN_ATTR_VALUE ((ifld), CGEN_IFLD_ATTRS (ifld), (attr))
862
863/* Instruction data.  */
864
865/* Instruction formats.
866
867   Instructions are grouped by format.  Associated with an instruction is its
868   format.  Each insn's opcode table entry contains a format table entry.
869   ??? There is usually very few formats compared with the number of insns,
870   so one can reduce the size of the opcode table by recording the format table
871   as a separate entity.  Given that we currently don't, format table entries
872   are also distinguished by their operands.  This increases the size of the
873   table, but reduces the number of tables.  It's all minutiae anyway so it
874   doesn't really matter [at this point in time].
875
876   ??? Support for variable length ISA's is wip.  */
877
878/* Accompanying each iformat description is a list of its fields.  */
879
880typedef struct {
881  const CGEN_IFLD *ifld;
882#define CGEN_IFMT_IFLD_IFLD(ii) ((ii)->ifld)
883} CGEN_IFMT_IFLD;
884
885/* This should be at least as large as necessary for any target. */
886#define CGEN_MAX_IFMT_OPERANDS 16
887
888/* A target may know its own precise maximum.  Assert that it falls below
889   the above limit. */
890#ifdef CGEN_ACTUAL_MAX_IFMT_OPERANDS
891#if CGEN_ACTUAL_MAX_IFMT_OPERANDS > CGEN_MAX_IFMT_OPERANDS
892#error "CGEN_ACTUAL_MAX_IFMT_OPERANDS too high - enlarge CGEN_MAX_IFMT_OPERANDS"
893#endif
894#endif
895
896
897typedef struct
898{
899  /* Length that MASK and VALUE have been calculated to
900     [VALUE is recorded elsewhere].
901     Normally it is base_insn_bitsize.  On [V]LIW architectures where the base
902     insn size may be larger than the size of an insn, this field is less than
903     base_insn_bitsize.  */
904  unsigned char mask_length;
905#define CGEN_IFMT_MASK_LENGTH(ifmt) ((ifmt)->mask_length)
906
907  /* Total length of instruction, in bits.  */
908  unsigned char length;
909#define CGEN_IFMT_LENGTH(ifmt) ((ifmt)->length)
910
911  /* Mask to apply to the first MASK_LENGTH bits.
912     Each insn's value is stored with the insn.
913     The first step in recognizing an insn for disassembly is
914     (opcode & mask) == value.  */
915  CGEN_INSN_INT mask;
916#define CGEN_IFMT_MASK(ifmt) ((ifmt)->mask)
917
918  /* Instruction fields.
919     +1 for trailing NULL.  */
920  CGEN_IFMT_IFLD iflds[CGEN_MAX_IFMT_OPERANDS + 1];
921#define CGEN_IFMT_IFLDS(ifmt) ((ifmt)->iflds)
922} CGEN_IFMT;
923
924/* Instruction values.  */
925
926typedef struct
927{
928  /* The opcode portion of the base insn.  */
929  CGEN_INSN_INT base_value;
930
931#ifdef CGEN_MAX_EXTRA_OPCODE_OPERANDS
932  /* Extra opcode values beyond base_value.  */
933  unsigned long ifield_values[CGEN_MAX_EXTRA_OPCODE_OPERANDS];
934#endif
935} CGEN_IVALUE;
936
937/* Instruction opcode table.
938   This contains the syntax and format data of an instruction.  */
939
940/* ??? Some ports already have an opcode table yet still need to use the rest
941   of what cgen_insn has.  Plus keeping the opcode data with the operand
942   instance data can create a pretty big file.  So we keep them separately.
943   Not sure this is a good idea in the long run.  */
944
945typedef struct
946{
947  /* Indices into parse/insert/extract/print handler tables.  */
948  struct cgen_opcode_handler handlers;
949#define CGEN_OPCODE_HANDLERS(opc) (& (opc)->handlers)
950
951  /* Syntax string.  */
952  CGEN_SYNTAX syntax;
953#define CGEN_OPCODE_SYNTAX(opc) (& (opc)->syntax)
954
955  /* Format entry.  */
956  const CGEN_IFMT *format;
957#define CGEN_OPCODE_FORMAT(opc) ((opc)->format)
958#define CGEN_OPCODE_MASK_BITSIZE(opc) CGEN_IFMT_MASK_LENGTH (CGEN_OPCODE_FORMAT (opc))
959#define CGEN_OPCODE_BITSIZE(opc) CGEN_IFMT_LENGTH (CGEN_OPCODE_FORMAT (opc))
960#define CGEN_OPCODE_IFLDS(opc) CGEN_IFMT_IFLDS (CGEN_OPCODE_FORMAT (opc))
961
962  /* Instruction opcode value.  */
963  CGEN_IVALUE value;
964#define CGEN_OPCODE_VALUE(opc) (& (opc)->value)
965#define CGEN_OPCODE_BASE_VALUE(opc) (CGEN_OPCODE_VALUE (opc)->base_value)
966#define CGEN_OPCODE_BASE_MASK(opc) CGEN_IFMT_MASK (CGEN_OPCODE_FORMAT (opc))
967} CGEN_OPCODE;
968
969/* Instruction attributes.
970   This is made a published type as applications can cache a pointer to
971   the attributes for speed.  */
972
973#ifndef CGEN_INSN_NBOOL_ATTRS
974#define CGEN_INSN_NBOOL_ATTRS 1
975#endif
976typedef CGEN_ATTR_TYPE (CGEN_INSN_NBOOL_ATTRS) CGEN_INSN_ATTR_TYPE;
977
978/* Enum of architecture independent attributes.  */
979
980#ifndef CGEN_ARCH
981/* ??? Numbers here are recorded in two places.  */
982typedef enum cgen_insn_attr {
983  CGEN_INSN_ALIAS = 0
984} CGEN_INSN_ATTR;
985#define CGEN_ATTR_CGEN_INSN_ALIAS_VALUE(attrs) ((attrs)->bool_ & (1 << CGEN_INSN_ALIAS))
986#endif
987
988/* This struct defines each entry in the instruction table.  */
989
990typedef struct
991{
992  /* Each real instruction is enumerated.  */
993  /* ??? This may go away in time.  */
994  int num;
995#define CGEN_INSN_NUM(insn) ((insn)->base->num)
996
997  /* Name of entry (that distinguishes it from all other entries).  */
998  /* ??? If mnemonics have operands, try to print full mnemonic.  */
999  const char *name;
1000#define CGEN_INSN_NAME(insn) ((insn)->base->name)
1001
1002  /* Mnemonic.  This is used when parsing and printing the insn.
1003     In the case of insns that have operands on the mnemonics, this is
1004     only the constant part.  E.g. for conditional execution of an `add' insn,
1005     where the full mnemonic is addeq, addne, etc., and the condition is
1006     treated as an operand, this is only "add".  */
1007  const char *mnemonic;
1008#define CGEN_INSN_MNEMONIC(insn) ((insn)->base->mnemonic)
1009
1010  /* Total length of instruction, in bits.  */
1011  int bitsize;
1012#define CGEN_INSN_BITSIZE(insn) ((insn)->base->bitsize)
1013
1014#if 0 /* ??? Disabled for now as there is a problem with embedded newlines
1015         and the table is already pretty big.  Should perhaps be moved
1016         to a file of its own.  */
1017  /* Semantics, as RTL.  */
1018  /* ??? Plain text or bytecodes?  */
1019  /* ??? Note that the operand instance table could be computed at run-time
1020     if we parse this and cache the results.  Something to eventually do.  */
1021  const char *rtx;
1022#define CGEN_INSN_RTX(insn) ((insn)->base->rtx)
1023#endif
1024
1025  /* Attributes.
1026     This must appear last.  It is a variable sized array in that one
1027     architecture may have 1 nonbool attribute and another may have more.
1028     Having this last means the non-architecture specific code needn't
1029     care.  The goal is to eventually record attributes in their raw form,
1030     evaluate them at run-time, and cache the values, so this worry will go
1031     away anyway.  */
1032  CGEN_INSN_ATTR_TYPE attrs;
1033#define CGEN_INSN_ATTRS(insn) (&(insn)->base->attrs)
1034/* Return value of attribute ATTR in INSN.  */
1035#define CGEN_INSN_ATTR_VALUE(insn, attr) \
1036CGEN_ATTR_VALUE ((insn), CGEN_INSN_ATTRS (insn), (attr))
1037#define CGEN_INSN_BITSET_ATTR_VALUE(insn, attr) \
1038  CGEN_BITSET_ATTR_VALUE ((insn), CGEN_INSN_ATTRS (insn), (attr))
1039} CGEN_IBASE;
1040
1041/* Return non-zero if INSN is the "invalid" insn marker.  */
1042
1043#define CGEN_INSN_INVALID_P(insn) (CGEN_INSN_MNEMONIC (insn) == 0)
1044
1045/* Main struct contain instruction information.
1046   BASE is always present, the rest is present only if asked for.  */
1047
1048struct cgen_insn
1049{
1050  /* ??? May be of use to put a type indicator here.
1051     Then this struct could different info for different classes of insns.  */
1052  /* ??? A speedup can be had by moving `base' into this struct.
1053     Maybe later.  */
1054  const CGEN_IBASE *base;
1055  const CGEN_OPCODE *opcode;
1056  const CGEN_OPINST *opinst;
1057
1058  /* Regex to disambiguate overloaded opcodes */
1059  void *rx;
1060#define CGEN_INSN_RX(insn) ((insn)->rx)
1061#define CGEN_MAX_RX_ELEMENTS (CGEN_MAX_SYNTAX_ELEMENTS * 5)
1062};
1063
1064/* Instruction lists.
1065   This is used for adding new entries and for creating the hash lists.  */
1066
1067typedef struct cgen_insn_list
1068{
1069  struct cgen_insn_list *next;
1070  const CGEN_INSN *insn;
1071} CGEN_INSN_LIST;
1072
1073/* Table of instructions.  */
1074
1075typedef struct
1076{
1077  const CGEN_INSN *init_entries;
1078  unsigned int entry_size; /* since the attribute member is variable sized */
1079  unsigned int num_init_entries;
1080  CGEN_INSN_LIST *new_entries;
1081} CGEN_INSN_TABLE;
1082
1083/* Return number of instructions.  This includes any added at run-time.  */
1084
1085extern int cgen_insn_count (CGEN_CPU_DESC);
1086extern int cgen_macro_insn_count (CGEN_CPU_DESC);
1087
1088/* Macros to access the other insn elements not recorded in CGEN_IBASE.  */
1089
1090/* Fetch INSN's operand instance table.  */
1091/* ??? Doesn't handle insns added at runtime.  */
1092#define CGEN_INSN_OPERANDS(insn) ((insn)->opinst)
1093
1094/* Return INSN's opcode table entry.  */
1095#define CGEN_INSN_OPCODE(insn) ((insn)->opcode)
1096
1097/* Return INSN's handler data.  */
1098#define CGEN_INSN_HANDLERS(insn) CGEN_OPCODE_HANDLERS (CGEN_INSN_OPCODE (insn))
1099
1100/* Return INSN's syntax.  */
1101#define CGEN_INSN_SYNTAX(insn) CGEN_OPCODE_SYNTAX (CGEN_INSN_OPCODE (insn))
1102
1103/* Return size of base mask in bits.  */
1104#define CGEN_INSN_MASK_BITSIZE(insn) \
1105  CGEN_OPCODE_MASK_BITSIZE (CGEN_INSN_OPCODE (insn))
1106
1107/* Return mask of base part of INSN.  */
1108#define CGEN_INSN_BASE_MASK(insn) \
1109  CGEN_OPCODE_BASE_MASK (CGEN_INSN_OPCODE (insn))
1110
1111/* Return value of base part of INSN.  */
1112#define CGEN_INSN_BASE_VALUE(insn) \
1113  CGEN_OPCODE_BASE_VALUE (CGEN_INSN_OPCODE (insn))
1114
1115/* Standard way to test whether INSN is supported by MACH.
1116   MACH is one of enum mach_attr.
1117   The "|1" is because the base mach is always selected.  */
1118#define CGEN_INSN_MACH_HAS_P(insn, mach) \
1119((CGEN_INSN_ATTR_VALUE ((insn), CGEN_INSN_MACH) & ((1 << (mach)) | 1)) != 0)
1120
1121/* Macro instructions.
1122   Macro insns aren't real insns, they map to one or more real insns.
1123   E.g. An architecture's "nop" insn may actually be an "mv r0,r0" or
1124   some such.
1125
1126   Macro insns can expand to nothing (e.g. a nop that is optimized away).
1127   This is useful in multi-insn macros that build a constant in a register.
1128   Of course this isn't the default behaviour and must be explicitly enabled.
1129
1130   Assembly of macro-insns is relatively straightforward.  Disassembly isn't.
1131   However, disassembly of at least some kinds of macro insns is important
1132   in order that the disassembled code preserve the readability of the original
1133   insn.  What is attempted here is to disassemble all "simple" macro-insns,
1134   where "simple" is currently defined to mean "expands to one real insn".
1135
1136   Simple macro-insns are handled specially.  They are emitted as ALIAS's
1137   of real insns.  This simplifies their handling since there's usually more
1138   of them than any other kind of macro-insn, and proper disassembly of them
1139   falls out for free.  */
1140
1141/* For each macro-insn there may be multiple expansion possibilities,
1142   depending on the arguments.  This structure is accessed via the `data'
1143   member of CGEN_INSN.  */
1144
1145typedef struct cgen_minsn_expansion {
1146  /* Function to do the expansion.
1147     If the expansion fails (e.g. "no match") NULL is returned.
1148     Space for the expansion is obtained with malloc.
1149     It is up to the caller to free it.  */
1150  const char * (* fn)
1151     (const struct cgen_minsn_expansion *,
1152      const char *, const char **, int *,
1153      CGEN_OPERAND **);
1154#define CGEN_MIEXPN_FN(ex) ((ex)->fn)
1155
1156  /* Instruction(s) the macro expands to.
1157     The format of STR is defined by FN.
1158     It is typically the assembly code of the real insn, but it could also be
1159     the original Scheme expression or a tokenized form of it (with FN being
1160     an appropriate interpreter).  */
1161  const char * str;
1162#define CGEN_MIEXPN_STR(ex) ((ex)->str)
1163} CGEN_MINSN_EXPANSION;
1164
1165/* Normal expander.
1166   When supported, this function will convert the input string to another
1167   string and the parser will be invoked recursively.  The output string
1168   may contain further macro invocations.  */
1169
1170extern const char * cgen_expand_macro_insn
1171  (CGEN_CPU_DESC, const struct cgen_minsn_expansion *,
1172   const char *, const char **, int *, CGEN_OPERAND **);
1173
1174/* The assembler insn table is hashed based on some function of the mnemonic
1175   (the actually hashing done is up to the target, but we provide a few
1176   examples like the first letter or a function of the entire mnemonic).  */
1177
1178extern CGEN_INSN_LIST * cgen_asm_lookup_insn
1179  (CGEN_CPU_DESC, const char *);
1180#define CGEN_ASM_LOOKUP_INSN(cd, string) cgen_asm_lookup_insn ((cd), (string))
1181#define CGEN_ASM_NEXT_INSN(insn) ((insn)->next)
1182
1183/* The disassembler insn table is hashed based on some function of machine
1184   instruction (the actually hashing done is up to the target).  */
1185
1186extern CGEN_INSN_LIST * cgen_dis_lookup_insn
1187  (CGEN_CPU_DESC, const char *, CGEN_INSN_INT);
1188/* FIXME: delete these two */
1189#define CGEN_DIS_LOOKUP_INSN(cd, buf, value) cgen_dis_lookup_insn ((cd), (buf), (value))
1190#define CGEN_DIS_NEXT_INSN(insn) ((insn)->next)
1191
1192/* The CPU description.
1193   A copy of this is created when the cpu table is "opened".
1194   All global state information is recorded here.
1195   Access macros are provided for "public" members.  */
1196
1197typedef struct cgen_cpu_desc
1198{
1199  /* Bitmap of selected machine(s) (a la BFD machine number).  */
1200  int machs;
1201
1202  /* Bitmap of selected isa(s).  */
1203  CGEN_BITSET *isas;
1204#define CGEN_CPU_ISAS(cd) ((cd)->isas)
1205
1206  /* Current endian.  */
1207  enum cgen_endian endian;
1208#define CGEN_CPU_ENDIAN(cd) ((cd)->endian)
1209
1210  /* Current insn endian.  */
1211  enum cgen_endian insn_endian;
1212#define CGEN_CPU_INSN_ENDIAN(cd) ((cd)->insn_endian)
1213
1214  /* Word size (in bits).  */
1215  /* ??? Or maybe maximum word size - might we ever need to allow a cpu table
1216     to be opened for both sparc32/sparc64?
1217     ??? Another alternative is to create a table of selected machs and
1218     lazily fetch the data from there.  */
1219  unsigned int word_bitsize;
1220
1221  /* Instruction chunk size (in bits), for purposes of endianness
1222     conversion.  */
1223  unsigned int insn_chunk_bitsize;
1224
1225  /* Indicator if sizes are unknown.
1226     This is used by default_insn_bitsize,base_insn_bitsize if there is a
1227     difference between the selected isa's.  */
1228#define CGEN_SIZE_UNKNOWN 65535
1229
1230  /* Default instruction size (in bits).
1231     This is used by the assembler when it encounters an unknown insn.  */
1232  unsigned int default_insn_bitsize;
1233
1234  /* Base instruction size (in bits).
1235     For non-LIW cpus this is generally the length of the smallest insn.
1236     For LIW cpus its wip (work-in-progress).  For the m32r its 32.  */
1237  unsigned int base_insn_bitsize;
1238
1239  /* Minimum/maximum instruction size (in bits).  */
1240  unsigned int min_insn_bitsize;
1241  unsigned int max_insn_bitsize;
1242
1243  /* Instruction set variants.  */
1244  const CGEN_ISA *isa_table;
1245
1246  /* Machine variants.  */
1247  const CGEN_MACH *mach_table;
1248
1249  /* Hardware elements.  */
1250  CGEN_HW_TABLE hw_table;
1251
1252  /* Instruction fields.  */
1253  const CGEN_IFLD *ifld_table;
1254
1255  /* Operands.  */
1256  CGEN_OPERAND_TABLE operand_table;
1257
1258  /* Main instruction table.  */
1259  CGEN_INSN_TABLE insn_table;
1260#define CGEN_CPU_INSN_TABLE(cd) (& (cd)->insn_table)
1261
1262  /* Macro instructions are defined separately and are combined with real
1263     insns during hash table computation.  */
1264  CGEN_INSN_TABLE macro_insn_table;
1265
1266  /* Copy of CGEN_INT_INSN_P.  */
1267  int int_insn_p;
1268
1269  /* Called to rebuild the tables after something has changed.  */
1270  void (*rebuild_tables) (CGEN_CPU_DESC);
1271
1272  /* Operand parser callback.  */
1273  cgen_parse_operand_fn * parse_operand_fn;
1274
1275  /* Parse/insert/extract/print cover fns for operands.  */
1276  const char * (*parse_operand)
1277    (CGEN_CPU_DESC, int opindex_, const char **, CGEN_FIELDS *fields_);
1278#ifdef __BFD_H_SEEN__
1279  const char * (*insert_operand)
1280    (CGEN_CPU_DESC, int opindex_, CGEN_FIELDS *fields_,
1281     CGEN_INSN_BYTES_PTR, bfd_vma pc_);
1282  int (*extract_operand)
1283    (CGEN_CPU_DESC, int opindex_, CGEN_EXTRACT_INFO *, CGEN_INSN_INT,
1284     CGEN_FIELDS *fields_, bfd_vma pc_);
1285  void (*print_operand)
1286    (CGEN_CPU_DESC, int opindex_, void * info_, CGEN_FIELDS * fields_,
1287     void const *attrs_, bfd_vma pc_, int length_);
1288#else
1289  const char * (*insert_operand) ();
1290  int (*extract_operand) ();
1291  void (*print_operand) ();
1292#endif
1293#define CGEN_CPU_PARSE_OPERAND(cd) ((cd)->parse_operand)
1294#define CGEN_CPU_INSERT_OPERAND(cd) ((cd)->insert_operand)
1295#define CGEN_CPU_EXTRACT_OPERAND(cd) ((cd)->extract_operand)
1296#define CGEN_CPU_PRINT_OPERAND(cd) ((cd)->print_operand)
1297
1298  /* Size of CGEN_FIELDS struct.  */
1299  unsigned int sizeof_fields;
1300#define CGEN_CPU_SIZEOF_FIELDS(cd) ((cd)->sizeof_fields)
1301
1302  /* Set the bitsize field.  */
1303  void (*set_fields_bitsize) (CGEN_FIELDS *fields_, int size_);
1304#define CGEN_CPU_SET_FIELDS_BITSIZE(cd) ((cd)->set_fields_bitsize)
1305
1306  /* CGEN_FIELDS accessors.  */
1307  int (*get_int_operand)
1308    (CGEN_CPU_DESC, int opindex_, const CGEN_FIELDS *fields_);
1309  void (*set_int_operand)
1310    (CGEN_CPU_DESC, int opindex_, CGEN_FIELDS *fields_, int value_);
1311#ifdef __BFD_H_SEEN__
1312  bfd_vma (*get_vma_operand)
1313    (CGEN_CPU_DESC, int opindex_, const CGEN_FIELDS *fields_);
1314  void (*set_vma_operand)
1315    (CGEN_CPU_DESC, int opindex_, CGEN_FIELDS *fields_, bfd_vma value_);
1316#else
1317  long (*get_vma_operand) ();
1318  void (*set_vma_operand) ();
1319#endif
1320#define CGEN_CPU_GET_INT_OPERAND(cd) ((cd)->get_int_operand)
1321#define CGEN_CPU_SET_INT_OPERAND(cd) ((cd)->set_int_operand)
1322#define CGEN_CPU_GET_VMA_OPERAND(cd) ((cd)->get_vma_operand)
1323#define CGEN_CPU_SET_VMA_OPERAND(cd) ((cd)->set_vma_operand)
1324
1325  /* Instruction parse/insert/extract/print handlers.  */
1326  /* FIXME: make these types uppercase.  */
1327  cgen_parse_fn * const *parse_handlers;
1328  cgen_insert_fn * const *insert_handlers;
1329  cgen_extract_fn * const *extract_handlers;
1330  cgen_print_fn * const *print_handlers;
1331#define CGEN_PARSE_FN(cd, insn)   (cd->parse_handlers[(insn)->opcode->handlers.parse])
1332#define CGEN_INSERT_FN(cd, insn)  (cd->insert_handlers[(insn)->opcode->handlers.insert])
1333#define CGEN_EXTRACT_FN(cd, insn) (cd->extract_handlers[(insn)->opcode->handlers.extract])
1334#define CGEN_PRINT_FN(cd, insn)   (cd->print_handlers[(insn)->opcode->handlers.print])
1335
1336  /* Return non-zero if insn should be added to hash table.  */
1337  int (* asm_hash_p) (const CGEN_INSN *);
1338
1339  /* Assembler hash function.  */
1340  unsigned int (* asm_hash) (const char *);
1341
1342  /* Number of entries in assembler hash table.  */
1343  unsigned int asm_hash_size;
1344
1345  /* Return non-zero if insn should be added to hash table.  */
1346  int (* dis_hash_p) (const CGEN_INSN *);
1347
1348  /* Disassembler hash function.  */
1349  unsigned int (* dis_hash) (const char *, CGEN_INSN_INT);
1350
1351  /* Number of entries in disassembler hash table.  */
1352  unsigned int dis_hash_size;
1353
1354  /* Assembler instruction hash table.  */
1355  CGEN_INSN_LIST **asm_hash_table;
1356  CGEN_INSN_LIST *asm_hash_table_entries;
1357
1358  /* Disassembler instruction hash table.  */
1359  CGEN_INSN_LIST **dis_hash_table;
1360  CGEN_INSN_LIST *dis_hash_table_entries;
1361
1362  /* This field could be turned into a bitfield if room for other flags is needed.  */
1363  unsigned int signed_overflow_ok_p;
1364       
1365} CGEN_CPU_TABLE;
1366
1367/* wip */
1368#ifndef CGEN_WORD_ENDIAN
1369#define CGEN_WORD_ENDIAN(cd) CGEN_CPU_ENDIAN (cd)
1370#endif
1371#ifndef CGEN_INSN_WORD_ENDIAN
1372#define CGEN_INSN_WORD_ENDIAN(cd) CGEN_CPU_INSN_ENDIAN (cd)
1373#endif
1374
1375/* Prototypes of major functions.  */
1376/* FIXME: Move more CGEN_SYM-defined functions into CGEN_CPU_DESC.
1377   Not the init fns though, as that would drag in things that mightn't be
1378   used and might not even exist.  */
1379
1380/* Argument types to cpu_open.  */
1381
1382enum cgen_cpu_open_arg {
1383  CGEN_CPU_OPEN_END,
1384  /* Select instruction set(s), arg is bitmap or 0 meaning "unspecified".  */
1385  CGEN_CPU_OPEN_ISAS,
1386  /* Select machine(s), arg is bitmap or 0 meaning "unspecified".  */
1387  CGEN_CPU_OPEN_MACHS,
1388  /* Select machine, arg is mach's bfd name.
1389     Multiple machines can be specified by repeated use.  */
1390  CGEN_CPU_OPEN_BFDMACH,
1391  /* Select endian, arg is CGEN_ENDIAN_*.  */
1392  CGEN_CPU_OPEN_ENDIAN
1393};
1394
1395/* Open a cpu descriptor table for use.
1396   ??? We only support ISO C stdargs here, not K&R.
1397   Laziness, plus experiment to see if anything requires K&R - eventually
1398   K&R will no longer be supported - e.g. GDB is currently trying this.  */
1399
1400extern CGEN_CPU_DESC CGEN_SYM (cpu_open) (enum cgen_cpu_open_arg, ...);
1401
1402/* Cover fn to handle simple case.  */
1403
1404extern CGEN_CPU_DESC CGEN_SYM (cpu_open_1)
1405   (const char *mach_name_, enum cgen_endian endian_);
1406
1407/* Close it.  */
1408
1409extern void CGEN_SYM (cpu_close) (CGEN_CPU_DESC);
1410
1411/* Initialize the opcode table for use.
1412   Called by init_asm/init_dis.  */
1413
1414extern void CGEN_SYM (init_opcode_table) (CGEN_CPU_DESC cd_);
1415
1416/* build the insn selection regex.
1417   called by init_opcode_table */
1418
1419extern char * CGEN_SYM(build_insn_regex) (CGEN_INSN *insn_);
1420
1421/* Initialize the ibld table for use.
1422   Called by init_asm/init_dis.  */
1423
1424extern void CGEN_SYM (init_ibld_table) (CGEN_CPU_DESC cd_);
1425
1426/* Initialize an cpu table for assembler or disassembler use.
1427   These must be called immediately after cpu_open.  */
1428
1429extern void CGEN_SYM (init_asm) (CGEN_CPU_DESC);
1430extern void CGEN_SYM (init_dis) (CGEN_CPU_DESC);
1431
1432/* Initialize the operand instance table for use.  */
1433
1434extern void CGEN_SYM (init_opinst_table) (CGEN_CPU_DESC cd_);
1435
1436/* Assemble an instruction.  */
1437
1438extern const CGEN_INSN * CGEN_SYM (assemble_insn)
1439  (CGEN_CPU_DESC, const char *, CGEN_FIELDS *,
1440   CGEN_INSN_BYTES_PTR, char **);
1441
1442extern const CGEN_KEYWORD CGEN_SYM (operand_mach);
1443extern int CGEN_SYM (get_mach) (const char *);
1444
1445/* Operand index computation.  */
1446extern const CGEN_INSN * cgen_lookup_insn
1447  (CGEN_CPU_DESC, const CGEN_INSN * insn_,
1448   CGEN_INSN_INT int_value_, unsigned char *bytes_value_,
1449   int length_, CGEN_FIELDS *fields_, int alias_p_);
1450extern void cgen_get_insn_operands
1451  (CGEN_CPU_DESC, const CGEN_INSN * insn_,
1452   const CGEN_FIELDS *fields_, int *indices_);
1453extern const CGEN_INSN * cgen_lookup_get_insn_operands
1454  (CGEN_CPU_DESC, const CGEN_INSN *insn_,
1455   CGEN_INSN_INT int_value_, unsigned char *bytes_value_,
1456   int length_, int *indices_, CGEN_FIELDS *fields_);
1457
1458/* Cover fns to bfd_get/set.  */
1459
1460extern CGEN_INSN_INT cgen_get_insn_value
1461  (CGEN_CPU_DESC, unsigned char *, int);
1462extern void cgen_put_insn_value
1463  (CGEN_CPU_DESC, unsigned char *, int, CGEN_INSN_INT);
1464
1465/* Read in a cpu description file.
1466   ??? For future concerns, including adding instructions to the assembler/
1467   disassembler at run-time.  */
1468
1469extern const char * cgen_read_cpu_file (CGEN_CPU_DESC, const char * filename_);
1470
1471/* Allow signed overflow of instruction fields.  */
1472extern void cgen_set_signed_overflow_ok (CGEN_CPU_DESC);
1473
1474/* Generate an error message if a signed field in an instruction overflows.  */
1475extern void cgen_clear_signed_overflow_ok (CGEN_CPU_DESC);
1476
1477/* Will an error message be generated if a signed field in an instruction overflows ? */
1478extern unsigned int cgen_signed_overflow_ok_p (CGEN_CPU_DESC);
1479
1480#endif /* OPCODE_CGEN_H */
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