/* Disassemble SPU instructions

  Copyright (C) 2006-2024 Free Software Foundation, Inc.

  This file is part of the GNU opcodes library.

  This library 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 3, or (at your option)
  any later version.

  It 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 this file; see the file COPYING.  If not, write to the
  Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
  MA 02110-1301, USA.  */

#include "sysdep.h"
#include <stdio.h>
#include "disassemble.h"
#include "opcode/spu.h"

/* This file provides a disassembler function which uses
  the disassembler interface defined in dis-asm.h.   */

extern const struct spu_opcode spu_opcodes[];
extern const int spu_num_opcodes;

static const struct spu_opcode *spu_disassemble_table[(1<<11)];

static void
init_spu_disassemble (void)
{
 int i;

 /* If two instructions have the same opcode then we prefer the first
  * one.  In most cases it is just an alternate mnemonic. */
 for (i = 0; i < spu_num_opcodes; i++)
   {
     int o = spu_opcodes[i].opcode;
     if (o >= (1 << 11))
       abort ();
     if (spu_disassemble_table[o] == 0)
       spu_disassemble_table[o] = &spu_opcodes[i];
   }
}

/* Determine the instruction from the 10 least significant bits. */
static const struct spu_opcode *
get_index_for_opcode (unsigned int insn)
{
 const struct spu_opcode *op_index;
 unsigned int opcode = insn >> (32-11);

 /* Init the table.  This assumes that element 0/opcode 0 (currently
  * NOP) is always used */
 if (spu_disassemble_table[0] == 0)
   init_spu_disassemble ();

 if ((op_index = spu_disassemble_table[opcode & 0x780]) != 0
     && op_index->insn_type == RRR)
   return op_index;

 if ((op_index = spu_disassemble_table[opcode & 0x7f0]) != 0
     && (op_index->insn_type == RI18 || op_index->insn_type == LBT))
   return op_index;

 if ((op_index = spu_disassemble_table[opcode & 0x7f8]) != 0
     && op_index->insn_type == RI10)
   return op_index;

 if ((op_index = spu_disassemble_table[opcode & 0x7fc]) != 0
     && (op_index->insn_type == RI16))
   return op_index;

 if ((op_index = spu_disassemble_table[opcode & 0x7fe]) != 0
     && (op_index->insn_type == RI8))
   return op_index;

 if ((op_index = spu_disassemble_table[opcode & 0x7ff]) != 0)
   return op_index;

 return 0;
}

/* Print a Spu instruction.  */

int
print_insn_spu (bfd_vma memaddr, struct disassemble_info *info)
{
 bfd_byte buffer[4];
 int value;
 int hex_value;
 int status;
 unsigned int insn;
 const struct spu_opcode *op_index;
 enum spu_insns tag;

 status = (*info->read_memory_func) (memaddr, buffer, 4, info);
 if (status != 0)
   {
     (*info->memory_error_func) (status, memaddr, info);
     return -1;
   }

 insn = bfd_getb32 (buffer);

 op_index = get_index_for_opcode (insn);

 if (op_index == 0)
   {
     (*info->fprintf_func) (info->stream, ".long 0x%x", insn);
   }
 else
   {
     int i;
     int paren = 0;
     tag = (enum spu_insns)(op_index - spu_opcodes);
     (*info->fprintf_func) (info->stream, "%s", op_index->mnemonic);
     if (tag == M_BI || tag == M_BISL || tag == M_IRET || tag == M_BISLED
         || tag == M_BIHNZ || tag == M_BIHZ || tag == M_BINZ || tag == M_BIZ
         || tag == M_SYNC || tag == M_HBR)
       {
         int fb = (insn >> (32-18)) & 0x7f;
         if (fb & 0x40)
           (*info->fprintf_func) (info->stream, tag == M_SYNC ? "c" : "p");
         if (fb & 0x20)
           (*info->fprintf_func) (info->stream, "d");
         if (fb & 0x10)
           (*info->fprintf_func) (info->stream, "e");
       }
     if (op_index->arg[0] != 0)
       (*info->fprintf_func) (info->stream, "\t");
     hex_value = 0;
     for (i = 1;  i <= op_index->arg[0]; i++)
       {
         int arg = op_index->arg[i];
         if (arg != A_P && !paren && i > 1)
           (*info->fprintf_func) (info->stream, ",");

         switch (arg)
           {
           case A_T:
             (*info->fprintf_func) (info->stream, "$%d",
                                    DECODE_INSN_RT (insn));
             break;
           case A_A:
             (*info->fprintf_func) (info->stream, "$%d",
                                    DECODE_INSN_RA (insn));
             break;
           case A_B:
             (*info->fprintf_func) (info->stream, "$%d",
                                    DECODE_INSN_RB (insn));
             break;
           case A_C:
             (*info->fprintf_func) (info->stream, "$%d",
                                    DECODE_INSN_RC (insn));
             break;
           case A_S:
             (*info->fprintf_func) (info->stream, "$sp%d",
                                    DECODE_INSN_RA (insn));
             break;
           case A_H:
             (*info->fprintf_func) (info->stream, "$ch%d",
                                    DECODE_INSN_RA (insn));
             break;
           case A_P:
             paren++;
             (*info->fprintf_func) (info->stream, "(");
             break;
           case A_U7A:
             (*info->fprintf_func) (info->stream, "%d",
                                    173 - DECODE_INSN_U8 (insn));
             break;
           case A_U7B:
             (*info->fprintf_func) (info->stream, "%d",
                                    155 - DECODE_INSN_U8 (insn));
             break;
           case A_S3:
           case A_S6:
           case A_S7:
           case A_S7N:
           case A_U3:
           case A_U5:
           case A_U6:
           case A_U7:
             hex_value = DECODE_INSN_I7 (insn);
             (*info->fprintf_func) (info->stream, "%d", hex_value);
             break;
           case A_S11:
             (*info->print_address_func) (memaddr + DECODE_INSN_I9a (insn) * 4,
                                          info);
             break;
           case A_S11I:
             (*info->print_address_func) (memaddr + DECODE_INSN_I9b (insn) * 4,
                                          info);
             break;
           case A_S10:
           case A_S10B:
             hex_value = DECODE_INSN_I10 (insn);
             (*info->fprintf_func) (info->stream, "%d", hex_value);
             break;
           case A_S14:
             hex_value = DECODE_INSN_I10 (insn) * 16;
             (*info->fprintf_func) (info->stream, "%d", hex_value);
             break;
           case A_S16:
             hex_value = DECODE_INSN_I16 (insn);
             (*info->fprintf_func) (info->stream, "%d", hex_value);
             break;
           case A_X16:
             hex_value = DECODE_INSN_U16 (insn);
             (*info->fprintf_func) (info->stream, "%u", hex_value);
             break;
           case A_R18:
             value = DECODE_INSN_I16 (insn) * 4;
             if (value == 0)
               (*info->fprintf_func) (info->stream, "%d", value);
             else
               {
                 hex_value = memaddr + value;
                 (*info->print_address_func) (hex_value & 0x3ffff, info);
               }
             break;
           case A_S18:
             value = DECODE_INSN_U16 (insn) * 4;
             if (value == 0)
               (*info->fprintf_func) (info->stream, "%d", value);
             else
               (*info->print_address_func) (value, info);
             break;
           case A_U18:
             value = DECODE_INSN_U18 (insn);
             if (value == 0 || !(*info->symbol_at_address_func)(0, info))
               {
                 hex_value = value;
                 (*info->fprintf_func) (info->stream, "%u", value);
               }
             else
               (*info->print_address_func) (value, info);
             break;
           case A_U14:
             hex_value = DECODE_INSN_U14 (insn);
             (*info->fprintf_func) (info->stream, "%u", hex_value);
             break;
           }
         if (arg != A_P && paren)
           {
             (*info->fprintf_func) (info->stream, ")");
             paren--;
           }
       }
     if (hex_value > 16)
       (*info->fprintf_func) (info->stream, "\t# %x", hex_value);
   }
 return 4;
}

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