include/xtensa-isa-internal.h

   1 /* Internal definitions for configurable Xtensa ISA support.
   2    Copyright 2003 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* Use the statically-linked version for the GNU tools.  */
  21 #define STATIC_LIBISA 1
  22
  23 #define ISA_INTERFACE_VERSION 3
  24
  25 struct config_struct
  26 {
  27     char *param_name;
  28     char *param_value;
  29 };
  30
  31 /* Encode/decode function types for immediate operands.  */
  32 typedef uint32 (*xtensa_immed_decode_fn) (uint32);
  33 typedef xtensa_encode_result (*xtensa_immed_encode_fn) (uint32 *);
  34
  35 /* Field accessor function types.  */
  36 typedef uint32 (*xtensa_get_field_fn) (const xtensa_insnbuf);
  37 typedef void (*xtensa_set_field_fn) (xtensa_insnbuf, uint32);
  38
  39 /* PC-relative relocation function types.  */
  40 typedef uint32 (*xtensa_do_reloc_fn) (uint32, uint32);
  41 typedef uint32 (*xtensa_undo_reloc_fn) (uint32, uint32);
  42
  43 /* Instruction decode function type.  */
  44 typedef int (*xtensa_insn_decode_fn) (const xtensa_insnbuf);
  45
  46 /* Instruction encoding template function type (each of these functions
  47    returns a constant template; they exist only to make it easier for the
  48    TIE compiler to generate endian-independent DLLs).  */
  49 typedef xtensa_insnbuf (*xtensa_encoding_template_fn) (void);
  50
  51
  52 typedef struct xtensa_operand_internal_struct
  53 {
  54   char *operand_kind;                   /* e.g., "a", "f", "i", "l"....  */
  55   char inout;                           /* '<', '>', or '='.  */
  56   char isPCRelative;                    /* Is this a PC-relative offset?  */
  57   xtensa_get_field_fn get_field;        /* Get encoded value of the field.  */
  58   xtensa_set_field_fn set_field;        /* Set field with an encoded value.  */
  59   xtensa_immed_encode_fn encode;        /* Encode the operand value.  */
  60   xtensa_immed_decode_fn decode;        /* Decode the value from the field.  */
  61   xtensa_do_reloc_fn do_reloc;          /* Perform a PC-relative relocation.  */
  62   xtensa_undo_reloc_fn undo_reloc;      /* Undo a PC-relative relocation.  */
  63 } xtensa_operand_internal;
  64
  65
  66 typedef struct xtensa_iclass_internal_struct
  67 {
  68   int num_operands;                     /* Size of "operands" array.  */
  69   xtensa_operand_internal **operands;   /* Array of operand structures.  */
  70 } xtensa_iclass_internal;
  71
  72
  73 typedef struct xtensa_opcode_internal_struct
  74 {
  75   const char *name;                     /* Opcode mnemonic.  */
  76   int length;                           /* Length in bytes of the insn.  */
  77   xtensa_encoding_template_fn template; /* Fn returning encoding template.  */
  78   xtensa_iclass_internal *iclass;       /* Iclass for this opcode.  */
  79 } xtensa_opcode_internal;
  80
  81
  82 typedef struct opname_lookup_entry_struct
  83 {
  84   const char *key;                      /* Opcode mnemonic.  */
  85   xtensa_opcode opcode;                 /* Internal opcode number.  */
  86 } opname_lookup_entry;
  87
  88
  89 typedef struct xtensa_isa_internal_struct
  90 {
  91   int is_big_endian;                    /* Endianness.  */
  92   int insn_size;                        /* Maximum length in bytes.  */
  93   int insnbuf_size;                     /* Number of insnbuf_words.  */
  94   int num_opcodes;                      /* Total number for all modules.  */
  95   xtensa_opcode_internal **opcode_table;/* Indexed by internal opcode #.  */
  96   int num_modules;                      /* Number of modules (DLLs) loaded.  */
  97   int *module_opcode_base;              /* Starting opcode # for each module.  */
  98   xtensa_insn_decode_fn *module_decode_fn; /* Decode fn for each module.  */
  99   opname_lookup_entry *opname_lookup_table; /* Lookup table for each module.  */
 100   struct config_struct *config;         /* Table of configuration parameters.  */
 101   int has_density;                      /* Is density option available?  */
 102 } xtensa_isa_internal;
 103
 104
 105 typedef struct xtensa_isa_module_struct
 106 {
 107   int (*get_num_opcodes_fn) (void);
 108   xtensa_opcode_internal **(*get_opcodes_fn) (void);
 109   int (*decode_insn_fn) (const xtensa_insnbuf);
 110   struct config_struct *(*get_config_table_fn) (void);
 111 } xtensa_isa_module;
 112
 113 extern xtensa_isa_module xtensa_isa_modules[];
 114