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      1 /* Declarations for stacks of tokenized Xtensa instructions.
      2    Copyright (C) 2003-2014 Free Software Foundation, Inc.
      3 
      4    This file is part of GAS, the GNU Assembler.
      5 
      6    GAS is free software; you can redistribute it and/or modify
      7    it under the terms of the GNU General Public License as published by
      8    the Free Software Foundation; either version 3, or (at your option)
      9    any later version.
     10 
     11    GAS is distributed in the hope that it will be useful,
     12    but WITHOUT ANY WARRANTY; without even the implied warranty of
     13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14    GNU General Public License for more details.
     15 
     16    You should have received a copy of the GNU General Public License
     17    along with GAS; see the file COPYING.  If not, write to the Free
     18    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
     19    02110-1301, USA.  */
     20 
     21 #ifndef XTENSA_ISTACK_H
     22 #define XTENSA_ISTACK_H
     23 
     24 #include "xtensa-isa.h"
     25 
     26 #define MAX_ISTACK 12
     27 #define MAX_INSN_ARGS 64
     28 
     29 enum itype_enum
     30 {
     31   ITYPE_INSN,
     32   ITYPE_LITERAL,
     33   ITYPE_LABEL
     34 };
     35 
     36 
     37 /* Literals have 1 token and no opcode.
     38    Labels have 1 token and no opcode.  */
     39 
     40 typedef struct tinsn_struct
     41 {
     42   enum itype_enum insn_type;
     43 
     44   xtensa_opcode opcode;	/* Literals have an invalid opcode.  */
     45   bfd_boolean is_specific_opcode;
     46   bfd_boolean keep_wide;
     47   int ntok;
     48   expressionS tok[MAX_INSN_ARGS];
     49   bfd_boolean loc_directive_seen;
     50   struct dwarf2_line_info debug_line;
     51 
     52   /* This field is used for two types of special pseudo ops:
     53      1. TLS-related operations.  Eg:  callx8.tls
     54      2. j.l  label, a2
     55 
     56      For the tls-related operations, it will hold a tls-related opcode
     57      and info to be used in a fixup.  For j.l it will hold a
     58      register to be used during relaxation.  */
     59   expressionS extra_arg;
     60 
     61   /* Filled out by relaxation_requirements:  */
     62   enum xtensa_relax_statesE subtype;
     63   int literal_space;
     64 
     65   /* Filled out by vinsn_to_insnbuf:  */
     66   symbolS *symbol;
     67   offsetT offset;
     68   fragS *literal_frag;
     69 } TInsn;
     70 
     71 
     72 /* tinsn_stack:  This is a stack of instructions to  be placed.  */
     73 
     74 typedef struct tinsn_stack
     75 {
     76   int ninsn;
     77   TInsn insn[MAX_ISTACK];
     78 } IStack;
     79 
     80 
     81 void istack_init (IStack *);
     82 bfd_boolean istack_empty (IStack *);
     83 bfd_boolean istack_full (IStack *);
     84 TInsn *istack_top (IStack *);
     85 void istack_push (IStack *, TInsn *);
     86 TInsn *istack_push_space (IStack *);
     87 void istack_pop (IStack *);
     88 
     89 /* TInsn utilities.  */
     90 void tinsn_init (TInsn *);
     91 
     92 
     93 /* vliw_insn: bundles of TInsns.  */
     94 
     95 typedef struct vliw_insn
     96 {
     97   xtensa_format format;
     98   int num_slots;
     99   unsigned int inside_bundle;
    100   TInsn slots[MAX_SLOTS];
    101   xtensa_insnbuf insnbuf;
    102   xtensa_insnbuf slotbuf[MAX_SLOTS];
    103 } vliw_insn;
    104 
    105 #endif /* !XTENSA_ISTACK_H */
    106