/* tilepro-dis.c.  Disassembly routines for the TILEPro architecture.
  Copyright (C) 2011-2024 Free Software Foundation, Inc.

  This file is part of the GNU opcodes library.

  This program 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 of the License, or
  (at your option) any later version.

  This program 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 program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  MA 02110-1301, USA.  */

#include "sysdep.h"
#include <stddef.h>
#include <assert.h>
#include "bfd.h"
#include "elf/tilepro.h"
#include "elf-bfd.h"
#include "disassemble.h"
#include "opcode/tilepro.h"


#define TREG_ZERO 63

static int
contains_insn (tilepro_mnemonic expected_mnemonic,
              int expected_first_operand,
              int expected_second_operand,
              bfd_vma memaddr,
              int *last_operand_ret,
              disassemble_info *info)
{
 struct tilepro_decoded_instruction
   decoded[TILEPRO_MAX_INSTRUCTIONS_PER_BUNDLE];
 bfd_byte opbuf[TILEPRO_BUNDLE_SIZE_IN_BYTES];
 int i, num_instructions;

 if ((*info->read_memory_func) (memaddr, opbuf,
                                TILEPRO_BUNDLE_SIZE_IN_BYTES, info) != 0)
   /* If we cannot even read the memory, it obviously does not have the
      instruction for which we are looking. */
   return 0;

 /* Parse the instructions in the bundle. */
 num_instructions = parse_insn_tilepro (bfd_getl64 (opbuf), memaddr, decoded);

 for (i = 0; i < num_instructions; i++)
   {
     const struct tilepro_opcode *opcode = decoded[i].opcode;

     if (opcode->mnemonic != expected_mnemonic)
       continue;

     if (expected_first_operand != -1
         && decoded[i].operand_values[0] != expected_first_operand)
       continue;

     if (expected_second_operand != -1
         && decoded[i].operand_values[1] != expected_second_operand)
       continue;

     *last_operand_ret = decoded[i].operand_values[opcode->num_operands - 1];
     return 1;
   }

 /* No match. */
 return 0;
}


int
print_insn_tilepro (bfd_vma memaddr, disassemble_info *info)
{
 struct tilepro_decoded_instruction
   decoded[TILEPRO_MAX_INSTRUCTIONS_PER_BUNDLE];
 bfd_byte opbuf[TILEPRO_BUNDLE_SIZE_IN_BYTES];
 int status, i, num_instructions, num_printed;
 tilepro_mnemonic padding_mnemonic;

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

 info->bytes_per_line = TILEPRO_BUNDLE_SIZE_IN_BYTES;
 info->bytes_per_chunk = TILEPRO_BUNDLE_SIZE_IN_BYTES;
 info->octets_per_byte = 1;
 info->display_endian = BFD_ENDIAN_LITTLE;

 /* Parse the instructions in the bundle.  */
 num_instructions = parse_insn_tilepro (bfd_getl64 (opbuf), memaddr, decoded);

 /* Print the instructions in the bundle.  */
 info->fprintf_func (info->stream, "{ ");
 num_printed = 0;

 /* Determine which nop opcode is used for padding and should be skipped.  */
 padding_mnemonic = TILEPRO_OPC_FNOP;
 for (i = 0; i < num_instructions; i++)
   {
     if (!decoded[i].opcode->can_bundle)
       {
         /* Instructions that cannot be bundled are padded out with nops,
            rather than fnops. Displaying them is always clutter.  */
         padding_mnemonic = TILEPRO_OPC_NOP;
         break;
       }
   }

 for (i = 0; i < num_instructions; i++)
   {
     const struct tilepro_opcode *opcode = decoded[i].opcode;
     const char *name;
     int j;

     /* Do not print out fnops, unless everything is an fnop, in
        which case we will print out just the last one.  */
     if (opcode->mnemonic == padding_mnemonic
         && (num_printed > 0 || i + 1 < num_instructions))
       continue;

     if (num_printed > 0)
       info->fprintf_func (info->stream, " ; ");
     ++num_printed;

     name = opcode->name;
     if (name == NULL)
       name = "<invalid>";
     info->fprintf_func (info->stream, "%s", name);

     for (j = 0; j < opcode->num_operands; j++)
       {
         int num;
         const struct tilepro_operand *op;
         const char *spr_name;

         if (j > 0)
           info->fprintf_func (info->stream, ",");
         info->fprintf_func (info->stream, " ");

         num = decoded[i].operand_values[j];

         op = decoded[i].operands[j];
         switch (op->type)
           {
           case TILEPRO_OP_TYPE_REGISTER:
             info->fprintf_func (info->stream, "%s",
                                 tilepro_register_names[num]);
             break;

           case TILEPRO_OP_TYPE_SPR:
             spr_name = get_tilepro_spr_name(num);
             if (spr_name != NULL)
               info->fprintf_func (info->stream, "%s", spr_name);
             else
               info->fprintf_func (info->stream, "%d", num);
             break;

           case TILEPRO_OP_TYPE_IMMEDIATE:
             {
               bfd_vma addr = 0;
               int found_addr = 0;
               int addr_piece;

               switch (opcode->mnemonic)
                 {
                 case TILEPRO_OPC_ADDLI:
                   if (contains_insn (TILEPRO_OPC_AULI,
                                      decoded[i].operand_values[1],
                                      TREG_ZERO,
                                      memaddr - TILEPRO_BUNDLE_SIZE_IN_BYTES,
                                      &addr_piece,
                                      info))
                     {
                       addr = num + (addr_piece << 16);
                       found_addr = 1;
                     }
                   break;

                 case TILEPRO_OPC_AULI:
                   if (contains_insn (TILEPRO_OPC_MOVELI,
                                      decoded[i].operand_values[1],
                                      -1,
                                      memaddr - TILEPRO_BUNDLE_SIZE_IN_BYTES,
                                      &addr_piece,
                                      info))
                     {
                       addr = (num << 16) + addr_piece;
                       found_addr = 1;
                     }
                   break;

                 default:
                   /* Operand does not look like a constructed address.  */
                   break;
                 }

               info->fprintf_func (info->stream, "%d", num);

               if (found_addr)
                 {
                   info->fprintf_func (info->stream, " /* ");
                   info->print_address_func (addr, info);
                   info->fprintf_func (info->stream, " */");
                 }
             }
             break;

           case TILEPRO_OP_TYPE_ADDRESS:
             info->print_address_func ((bfd_vma)(unsigned int) num, info);
             break;

           default:
             abort ();
           }
       }
   }
 info->fprintf_func (info->stream, " }");

 return TILEPRO_BUNDLE_SIZE_IN_BYTES;
}

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