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/* TI C6X disassembler.

   Copyright 2010

   Free Software Foundation, Inc.

   This file is part of libopcodes.

   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 of the License, 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 program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

#include "sysdep.h"

#include "dis-asm.h"

#include "opcode/tic6x.h"

#include "libiberty.h"

/* Define the instruction format table.  */

const tic6x_insn_format tic6x_insn_format_table[tic6x_insn_format_max] =

  {

#define FMT(name, num_bits, cst_bits, mask, fields) \

    { num_bits, cst_bits, mask, fields },

#include "opcode/tic6x-insn-formats.h"

#undef FMT

  };

/* Define the control register table.  */

const tic6x_ctrl tic6x_ctrl_table[tic6x_ctrl_max] =

  {

#define CTRL(name, isa, rw, crlo, crhi_mask)    \

    {                                           \

      STRINGX(name),                            \

      CONCAT2(TIC6X_INSN_,isa),                 \

      CONCAT2(tic6x_rw_,rw),                    \

      crlo,                                     \

      crhi_mask                                 \

    },

#include "opcode/tic6x-control-registers.h"

#undef CTRL

  };

/* Define the opcode table.  */

const tic6x_opcode tic6x_opcode_table[tic6x_opcode_max] =

  {

#define INSN(name, func_unit, format, type, isa, flags, fixed, ops, var) \

    {                                                                   \

      STRINGX(name),                                                    \

      CONCAT2(tic6x_func_unit_,func_unit),                              \

      CONCAT4(tic6x_insn_format_,func_unit,_,format),                   \

      CONCAT2(tic6x_pipeline_,type),                                    \

      CONCAT2(TIC6X_INSN_,isa),                                         \

      flags,                                                            \

      fixed,                                                            \

      ops,                                                              \

      var                                                               \

    },

#define INSNE(name, e, func_unit, format, type, isa, flags, fixed, ops, var) \

    {                                                                   \

      STRINGX(name),                                                    \

      CONCAT2(tic6x_func_unit_,func_unit),                              \

      CONCAT4(tic6x_insn_format_,func_unit,_,format),                   \

      CONCAT2(tic6x_pipeline_,type),                                    \

      CONCAT2(TIC6X_INSN_,isa),                                         \

      flags,                                                            \

      fixed,                                                            \

      ops,                                                              \

      var                                                               \

    },

#include "opcode/tic6x-opcode-table.h"

#undef INSN

#undef INSNE

  };

/* If instruction format FMT has a field FIELD, return a pointer to

   the description of that field; otherwise return NULL.  */

const tic6x_insn_field *

tic6x_field_from_fmt (const tic6x_insn_format *fmt, tic6x_insn_field_id field)

{

  unsigned int f;

  for (f = 0; f < fmt->num_fields; f++)

    if (fmt->fields[f].field_id == field)

      return &fmt->fields[f];

  return NULL;

}

/* Extract the bits corresponding to FIELD from OPCODE.  */

static unsigned int

tic6x_field_bits (unsigned int opcode, const tic6x_insn_field *field)

{

  return (opcode >> field->low_pos) & ((1u << field->width) - 1);

}

/* Extract a 32-bit value read from the instruction stream.  */

static unsigned int

tic6x_extract_32 (unsigned char *p, struct disassemble_info *info)

{

  if (info->endian == BFD_ENDIAN_LITTLE)

    return (p[0]) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);

  else

    return (p[3]) | (p[2] << 8) | (p[1] << 16) | (p[0] << 24);

}

/* Extract a 16-bit value read from the instruction stream.  */

static unsigned int

tic6x_extract_16 (unsigned char *p, struct disassemble_info *info)

{

  if (info->endian == BFD_ENDIAN_LITTLE)

    return (p[0]) | (p[1] << 8);

  else

    return (p[1]) | (p[0] << 8);

}

/* FP points to a fetch packet.  Return whether it is header-based; if

   it is, fill in HEADER.  */

static bfd_boolean

tic6x_check_fetch_packet_header (unsigned char *fp,

                                 tic6x_fetch_packet_header *header,

                                 struct disassemble_info *info)

{

  int i;

  header->header = tic6x_extract_32 (fp + 28, info);

  if ((header->header & 0xf0000000) != 0xe0000000)

    return FALSE;

  for (i = 0; i < 7; i++)

    header->word_compact[i]

      = (header->header & (1u << (21 + i))) ? TRUE : FALSE;

  header->prot = (header->header & (1u << 20)) ? TRUE : FALSE;

  header->rs = (header->header & (1u << 19)) ? TRUE : FALSE;

  header->dsz = (header->header >> 16) & 0x7;

  header->br = (header->header & (1u << 15)) ? TRUE : FALSE;

  header->sat = (header->header & (1u << 14)) ? TRUE : FALSE;

  for (i = 0; i < 14; i++)

    header->p_bits[i]

      = (header->header & (1u << i)) ? TRUE : FALSE;

  return TRUE;

}

/* Disassemble the instruction at ADDR and print it using

   INFO->FPRINTF_FUNC and INFO->STREAM, returning the number of bytes

   consumed.  */

int

print_insn_tic6x (bfd_vma addr, struct disassemble_info *info)

{

  int status;

  bfd_vma fp_addr;

  bfd_vma fp_offset;

  unsigned char fp[32];

  unsigned int opcode;

  tic6x_opcode_id opcode_id;

  bfd_boolean fetch_packet_header_based;

  tic6x_fetch_packet_header header;

  unsigned int num_bits;

  bfd_boolean bad_offset = FALSE;

  fp_offset = addr & 0x1f;

  fp_addr = addr - fp_offset;

  status = info->read_memory_func (fp_addr, fp, 32, info);

  if (status)

    {

      info->memory_error_func (status, addr, info);

      return -1;

    }

  fetch_packet_header_based

    = tic6x_check_fetch_packet_header (fp, &header, info);

  if (fetch_packet_header_based)

    {

      if (fp_offset & 0x1)

        bad_offset = TRUE;

      if ((fp_offset & 0x3) && (fp_offset >= 28

                                || !header.word_compact[fp_offset >> 2]))

        bad_offset = TRUE;

      if (fp_offset == 28)

        {

          info->bytes_per_chunk = 4;

          info->fprintf_func (info->stream, "<fetch packet header 0x%.8x>",

                              header.header);

          return 4;

        }

      num_bits = (header.word_compact[fp_offset >> 2] ? 16 : 32);

    }

  else

    {

      num_bits = 32;

      if (fp_offset & 0x3)

        bad_offset = TRUE;

    }

  if (bad_offset)

    {

      info->bytes_per_chunk = 1;

      info->fprintf_func (info->stream, ".byte 0x%.2x", fp[fp_offset]);

      return 1;

    }

  if (num_bits == 16)

    {

      /* The least-significant part of a 32-bit word comes logically

         before the most-significant part.  For big-endian, follow the

         TI assembler in showing instructions in logical order by

         pretending that the two halves of the word are in opposite

         locations to where they actually are.  */

      if (info->endian == BFD_ENDIAN_LITTLE)

        opcode = tic6x_extract_16 (fp + fp_offset, info);

      else

        opcode = tic6x_extract_16 (fp + (fp_offset ^ 2), info);

    }

  else

    opcode = tic6x_extract_32 (fp + fp_offset, info);

  for (opcode_id = 0; opcode_id < tic6x_opcode_max; opcode_id++)

    {

      const tic6x_opcode *const opc = &tic6x_opcode_table[opcode_id];

      const tic6x_insn_format *const fmt

        = &tic6x_insn_format_table[opc->format];

      const tic6x_insn_field *creg_field;

      bfd_boolean p_bit;

      const char *parallel;

      const char *cond = "";

      const char *func_unit;

      char func_unit_buf[7];

      unsigned int func_unit_side = 0;

      unsigned int func_unit_data_side = 0;

      unsigned int func_unit_cross = 0;

      /* The maximum length of the text of a non-PC-relative operand

         is 24 bytes (SPMASK masking all eight functional units, with

         separating commas and trailing NUL).  */

      char operands[TIC6X_MAX_OPERANDS][24] = { { 0 } };

      bfd_vma operands_addresses[TIC6X_MAX_OPERANDS] = { 0 };

      bfd_boolean operands_text[TIC6X_MAX_OPERANDS] = { FALSE };

      bfd_boolean operands_pcrel[TIC6X_MAX_OPERANDS] = { FALSE };

      unsigned int fix;

      unsigned int num_operands;

      unsigned int op_num;

      bfd_boolean fixed_ok;

      bfd_boolean operands_ok;

      if (opc->flags & TIC6X_FLAG_MACRO)

        continue;

      if (fmt->num_bits != num_bits)

        continue;

      if ((opcode & fmt->mask) != fmt->cst_bits)

        continue;

      /* If the format has a creg field, it is only a candidate for a

         match if the creg and z fields have values indicating a valid

         condition; reserved values indicate either an instruction

         format without a creg field, or an invalid instruction.  */

      creg_field = tic6x_field_from_fmt (fmt, tic6x_field_creg);

      if (creg_field)

        {

          const tic6x_insn_field *z_field;

          unsigned int creg_value, z_value;

          static const char *const conds[8][2] =

            {

              { "", NULL },

              { "[b0] ", "[!b0] " },

              { "[b1] ", "[!b1] " },

              { "[b2] ", "[!b2] " },

              { "[a1] ", "[!a1] " },

              { "[a2] ", "[!a2] " },

              { "[a0] ", "[!a0] " },

              { NULL, NULL }

            };

          /* A creg field is not meaningful without a z field, so if

             the z field is not present this is an error in the format

             table.  */

          z_field = tic6x_field_from_fmt (fmt, tic6x_field_z);

          if (!z_field)

            abort ();

          creg_value = tic6x_field_bits (opcode, creg_field);

          z_value = tic6x_field_bits (opcode, z_field);

          cond = conds[creg_value][z_value];

          if (cond == NULL)

            continue;

        }

      /* All fixed fields must have matching values; all fields with

         restricted ranges must have values within those ranges.  */

      fixed_ok = TRUE;

      for (fix = 0; fix < opc->num_fixed_fields; fix++)

        {

          unsigned int field_bits;

          const tic6x_insn_field *const field

            = tic6x_field_from_fmt (fmt, opc->fixed_fields[fix].field_id);

          if (!field)

            abort ();

          field_bits = tic6x_field_bits (opcode, field);

          if (field_bits < opc->fixed_fields[fix].min_val

              || field_bits > opc->fixed_fields[fix].max_val)

            {

              fixed_ok = FALSE;

              break;

            }

        }

      if (!fixed_ok)

        continue;

      /* The instruction matches.  */

      /* The p-bit indicates whether this instruction is in parallel

         with the *next* instruction, whereas the parallel bars

         indicate the instruction is in parallel with the *previous*

         instruction.  Thus, we must find the p-bit for the previous

         instruction.  */

      if (num_bits == 16 && (fp_offset & 0x2) == 2)

        {

          /* This is the logically second (most significant; second in

             fp_offset terms because fp_offset relates to logical not

             physical addresses) instruction of a compact pair; find

             the p-bit for the first (least significant).  */

          p_bit = header.p_bits[(fp_offset >> 2) << 1];

        }

      else if (fp_offset >= 4)

        {

          /* Find the last instruction of the previous word in this

             fetch packet.  For compact instructions, this is the most

             significant 16 bits.  */

          if (fetch_packet_header_based

              && header.word_compact[(fp_offset >> 2) - 1])

            p_bit = header.p_bits[(fp_offset >> 1) - 1];

          else

            {

              unsigned int prev_opcode

                = tic6x_extract_32 (fp + (fp_offset & 0x1c) - 4, info);

              p_bit = (prev_opcode & 0x1) ? TRUE : FALSE;

            }

        }

      else

        {

          /* Find the last instruction of the previous fetch

             packet.  */

          unsigned char fp_prev[32];

          status = info->read_memory_func (fp_addr - 32, fp_prev, 32, info);

          if (status)

            /* No previous instruction to be parallel with.  */

            p_bit = FALSE;

          else

            {

              bfd_boolean prev_header_based;

              tic6x_fetch_packet_header prev_header;

              prev_header_based

                = tic6x_check_fetch_packet_header (fp_prev, &prev_header, info);

              if (prev_header_based && prev_header.word_compact[6])

                p_bit = prev_header.p_bits[13];

              else

                {

                  unsigned int prev_opcode = tic6x_extract_32 (fp_prev + 28,

                                                               info);

                  p_bit = (prev_opcode & 0x1) ? TRUE : FALSE;

                }

            }

        }

      parallel = p_bit ? "|| " : "";

      if (opc->func_unit == tic6x_func_unit_nfu)

        func_unit = "";

      else

        {

          unsigned int fld_num;

          char func_unit_char;

          const char *data_str;

          bfd_boolean have_areg = FALSE;

          bfd_boolean have_cross = FALSE;

          func_unit_side = (opc->flags & TIC6X_FLAG_SIDE_B_ONLY) ? 2 : 0;

          func_unit_cross = 0;

          func_unit_data_side = (opc->flags & TIC6X_FLAG_SIDE_T2_ONLY) ? 2 : 0;

          for (fld_num = 0; fld_num < opc->num_variable_fields; fld_num++)

            {

              const tic6x_coding_field *const enc = &opc->variable_fields[fld_num];

              const tic6x_insn_field *field;

              unsigned int fld_val;

              field = tic6x_field_from_fmt (fmt, enc->field_id);

              if (!field)

                abort ();

              fld_val = tic6x_field_bits (opcode, field);

              switch (enc->coding_method)

                {

                case tic6x_coding_fu:

                  /* The side must be specified exactly once.  */

                  if (func_unit_side)

                    abort ();

                  func_unit_side = (fld_val ? 2 : 1);

                  break;

                case tic6x_coding_data_fu:

                  /* The data side must be specified exactly once.  */

                  if (func_unit_data_side)

                    abort ();

                  func_unit_data_side = (fld_val ? 2 : 1);

                  break;

                case tic6x_coding_xpath:

                  /* Cross path use must be specified exactly

                     once.  */

                  if (have_cross)

                    abort ();

                  have_cross = TRUE;

                  func_unit_cross = fld_val;

                  break;

                case tic6x_coding_areg:

                  have_areg = TRUE;

                  break;

                default:

                  /* Don't relate to functional units.  */

                  break;

                }

            }

          /* The side of the functional unit used must now have been

             determined either from the flags or from an instruction

             field.  */

          if (func_unit_side != 1 && func_unit_side != 2)

            abort ();

          /* Cross paths are not applicable when sides are specified

             for both address and data paths.  */

          if (func_unit_data_side && have_cross)

            abort ();

          /* Separate address and data paths are only applicable for

             the D unit.  */

          if (func_unit_data_side && opc->func_unit != tic6x_func_unit_d)

            abort ();

          /* If an address register is being used but in ADDA rather

             than a load or store, it uses a cross path for side-A

             instructions, and the cross path use is not specified by

             an instruction field.  */

          if (have_areg && !func_unit_data_side)

            {

              if (have_cross)

                abort ();

              func_unit_cross = (func_unit_side == 1 ? TRUE : FALSE);

            }

          switch (opc->func_unit)

            {

            case tic6x_func_unit_d:

              func_unit_char = 'D';

              break;

            case tic6x_func_unit_l:

              func_unit_char = 'L';

              break;

            case tic6x_func_unit_m:

              func_unit_char = 'M';

              break;

            case tic6x_func_unit_s:

              func_unit_char = 'S';

              break;

            default:

              abort ();

            }

          switch (func_unit_data_side)

            {

            case 0:

              data_str = "";

              break;

            case 1:

              data_str = "T1";

              break;

            case 2:

              data_str = "T2";

              break;

            default:

              abort ();

            }

          snprintf (func_unit_buf, 7, " .%c%u%s%s", func_unit_char,

                    func_unit_side, (func_unit_cross ? "X" : ""), data_str);

          func_unit = func_unit_buf;

        }

      /* For each operand there must be one or more fields set based

         on that operand, that can together be used to derive the

         operand value.  */

      operands_ok = TRUE;

      num_operands = opc->num_operands;

      for (op_num = 0; op_num < num_operands; op_num++)

        {

          unsigned int fld_num;

          unsigned int mem_base_reg = 0;

          bfd_boolean mem_base_reg_known = FALSE;

          bfd_boolean mem_base_reg_known_long = FALSE;

          unsigned int mem_offset = 0;

          bfd_boolean mem_offset_known = FALSE;

          bfd_boolean mem_offset_known_long = FALSE;

          unsigned int mem_mode = 0;

          bfd_boolean mem_mode_known = FALSE;

          unsigned int mem_scaled = 0;

          bfd_boolean mem_scaled_known = FALSE;

          unsigned int crlo = 0;

          bfd_boolean crlo_known = FALSE;

          unsigned int crhi = 0;

          bfd_boolean crhi_known = FALSE;

          bfd_boolean spmask_skip_operand = FALSE;

          unsigned int fcyc_bits = 0;

          bfd_boolean prev_sploop_found = FALSE;

          switch (opc->operand_info[op_num].form)

            {

            case tic6x_operand_retreg:

              /* Fully determined by the functional unit.  */

              operands_text[op_num] = TRUE;

              snprintf (operands[op_num], 24, "%c3",

                        (func_unit_side == 2 ? 'b' : 'a'));

              continue;

            case tic6x_operand_irp:

              operands_text[op_num] = TRUE;

              snprintf (operands[op_num], 24, "irp");

              continue;

            case tic6x_operand_nrp:

              operands_text[op_num] = TRUE;

              snprintf (operands[op_num], 24, "nrp");

              continue;

            default:

              break;

            }

          for (fld_num = 0; fld_num < opc->num_variable_fields; fld_num++)

            {

              const tic6x_coding_field *const enc

                = &opc->variable_fields[fld_num];

              const tic6x_insn_field *field;

              unsigned int fld_val;

              signed int signed_fld_val;

              if (enc->operand_num != op_num)

                continue;

              field = tic6x_field_from_fmt (fmt, enc->field_id);

              if (!field)

                abort ();

              fld_val = tic6x_field_bits (opcode, field);

              switch (enc->coding_method)

                {

                case tic6x_coding_ucst:

                case tic6x_coding_ulcst_dpr_byte:

                case tic6x_coding_ulcst_dpr_half:

                case tic6x_coding_ulcst_dpr_word:

                case tic6x_coding_lcst_low16:

                  switch (opc->operand_info[op_num].form)

                    {

                    case tic6x_operand_asm_const:

                    case tic6x_operand_link_const:

                      operands_text[op_num] = TRUE;

                      snprintf (operands[op_num], 24, "%u", fld_val);

                      break;

                    case tic6x_operand_mem_long:

                      mem_offset = fld_val;

                      mem_offset_known_long = TRUE;

                      break;

                    default:

                      abort ();

                    }

                  break;

                case tic6x_coding_lcst_high16:

                  operands_text[op_num] = TRUE;

                  snprintf (operands[op_num], 24, "%u", fld_val << 16);

                  break;

                case tic6x_coding_scst:

                  operands_text[op_num] = TRUE;

                  signed_fld_val = (signed int) fld_val;

                  signed_fld_val ^= (1 << (field->width - 1));

                  signed_fld_val -= (1 << (field->width - 1));

                  snprintf (operands[op_num], 24, "%d", signed_fld_val);

                  break;

                case tic6x_coding_ucst_minus_one:

                  operands_text[op_num] = TRUE;

                  snprintf (operands[op_num], 24, "%u", fld_val + 1);

                  break;

                case tic6x_coding_pcrel:

                case tic6x_coding_pcrel_half:

                  signed_fld_val = (signed int) fld_val;

                  signed_fld_val ^= (1 << (field->width - 1));

                  signed_fld_val -= (1 << (field->width - 1));

                  if (fetch_packet_header_based

                      && enc->coding_method == tic6x_coding_pcrel_half)

                    signed_fld_val *= 2;

                  else

                    signed_fld_val *= 4;

                  operands_pcrel[op_num] = TRUE;

                  operands_addresses[op_num] = fp_addr + signed_fld_val;

                  break;

                case tic6x_coding_reg_shift:

                  fld_val <<= 1;

                  /* Fall through.  */

                case tic6x_coding_reg:

                  switch (opc->operand_info[op_num].form)

                    {

                    case tic6x_operand_reg:

                      operands_text[op_num] = TRUE;

                      snprintf (operands[op_num], 24, "%c%u",

                                (func_unit_side == 2 ? 'b' : 'a'), fld_val);

                      break;

                    case tic6x_operand_xreg:

                      operands_text[op_num] = TRUE;

                      snprintf (operands[op_num], 24, "%c%u",

                                (((func_unit_side == 2) ^ func_unit_cross)

                                 ? 'b'

                                 : 'a'), fld_val);

                      break;

                    case tic6x_operand_dreg:

                      operands_text[op_num] = TRUE;