/* C-SKY disassembler.
  Copyright (C) 1988-2024 Free Software Foundation, Inc.
  Contributed by C-SKY Microsystems and Mentor Graphics.

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

#include "sysdep.h"
#include "config.h"
#include <stdio.h>
#include <stdint.h>
#include <elf/csky.h>
#include "disassemble.h"
#include "elf-bfd.h"
#include "opcode/csky.h"
#include "libiberty.h"
#include "csky-opc.h"
#include "floatformat.h"

#define CSKY_INST_TYPE unsigned long
#define HAS_SUB_OPERAND (unsigned int)0xffffffff
#define CSKY_DEFAULT_ISA 0xffffffff

enum sym_type
{
 CUR_TEXT,
 CUR_DATA
};

struct csky_dis_info
{
 /* Mem to disassemble.  */
 bfd_vma mem;
 /* Disassemble info.  */
 disassemble_info *info;
 /* Opcode information.  */
 struct csky_opcode_info const *opinfo;
 uint64_t isa;
 /* The value of operand to show.  */
 int value;
 /* Whether to look up/print a symbol name.  */
 int need_output_symbol;
} dis_info;


enum sym_type last_type;
int last_map_sym = 1;
bfd_vma last_map_addr = 0;
int using_abi = 0;

/* Only for objdump tool.  */
#define INIT_MACH_FLAG  0xffffffff
#define BINARY_MACH_FLAG 0x0

static unsigned int mach_flag = INIT_MACH_FLAG;

static void
print_insn_data (bfd_vma pc ATTRIBUTE_UNUSED,
                struct disassemble_info *info,
                long given)
{
 switch (info->bytes_per_chunk)
   {
   case 1:
     info->fprintf_func (info->stream, ".byte\t0x%02lx", given);
     break;
   case 2:
     info->fprintf_func (info->stream, ".short\t0x%04lx", given);
     break;
   case 4:
     info->fprintf_func (info->stream, ".long\t0x%08lx", given);
     break;
   default:
     abort ();
   }
}

static int
get_sym_code_type (struct disassemble_info *info,
                  int n,
                  enum sym_type *sym_type)
{
 const char *name;
 name = bfd_asymbol_name (info->symtab[n]);
 if (name[0] == '$' && (name[1] == 't' || name[1] == 'd')
     && (name[2] == 0 || name[2] == '.'))
   {
     *sym_type = ((name[1] == 't') ? CUR_TEXT : CUR_DATA);
     return true;
   }
 return false;
}

static int
csky_get_operand_mask (struct operand const *oprnd)
{
 int mask = 0;
 if (oprnd->mask == HAS_SUB_OPERAND)
   {
     struct soperand *sop = (struct soperand *)oprnd;
     mask |= csky_get_operand_mask (&sop->subs[0]);
     mask |= csky_get_operand_mask (&sop->subs[1]);
     return mask;
   }
 return oprnd->mask;
}

static int
csky_get_mask (struct csky_opcode_info const *pinfo)
{
 int i = 0;
 int mask = 0;
 /* List type.  */
 if (pinfo->operand_num == -1)
   mask |= csky_get_operand_mask (&pinfo->oprnd.oprnds[i]);
 else
   for (; i < pinfo->operand_num; i++)
     mask |= csky_get_operand_mask (&pinfo->oprnd.oprnds[i]);

 mask = ~mask;
 return mask;
}

static unsigned int
csky_chars_to_number (unsigned char * buf, int n)
{
 int i;
 unsigned int val = 0;

 if (dis_info.info->endian == BFD_ENDIAN_BIG)
   for (i = 0; i < n; i++)
     val = val << 8 | buf[i];
 else
   for (i = n - 1; i >= 0; i--)
     val = val << 8 | buf[i];
 return val;
}

static struct csky_opcode const *g_opcodeP;

static struct csky_opcode const *
csky_find_inst_info (struct csky_opcode_info const **pinfo,
                    CSKY_INST_TYPE inst, int length)
{
 int i;
 unsigned int mask;
 struct csky_opcode const *p;

 p = g_opcodeP;
 while (p->mnemonic)
   {
       if (!(p->isa_flag16 & dis_info.isa)
             && !(p->isa_flag32 & dis_info.isa))
       {
         p++;
         continue;
       }

     /* Get the opcode mask.  */
     for (i = 0; i < OP_TABLE_NUM; i++)
       if (length == 2)
         {
           mask =  csky_get_mask (&p->op16[i]);
           if (mask != 0 && (inst & mask) == p->op16[i].opcode)
             {
               *pinfo = &p->op16[i];
               g_opcodeP = p;
               return p;
             }
         }
       else if (length == 4)
         {
           mask =  csky_get_mask (&p->op32[i]);
           if (mask != 0
               && ((unsigned long)(inst & mask)
                   == (unsigned long)p->op32[i].opcode))
             {
               *pinfo = &p->op32[i];
               g_opcodeP = p;
               return p;
             }
         }
     p++;
   }

 return NULL;
}

static bool
is_extern_symbol (struct disassemble_info *info, int addr)
{
 unsigned int rel_count = 0;

 if (info->section == NULL)
   return 0;
 if ((info->section->flags & SEC_RELOC) != 0)  /* Fit .o file.  */
   {
     struct reloc_cache_entry *pt = info->section->relocation;
     for (; rel_count < info->section->reloc_count; rel_count++, pt++)
       if ((long unsigned int)addr == pt->address)
         return true;
     return false;
   }
 return false;
}


/* Suppress printing of mapping symbols emitted by the assembler to mark
  the beginning of code and data sequences.  */

bool
csky_symbol_is_valid (asymbol *sym,
                     struct disassemble_info *info ATTRIBUTE_UNUSED)
{
 const char *name;

 if (sym == NULL)
   return false;
 name = bfd_asymbol_name (sym);
 return name && *name != '$';
}

disassembler_ftype
csky_get_disassembler (bfd *abfd)
{
 obj_attribute *attr;
 const char *sec_name = NULL;
 if (!abfd || bfd_get_flavour (abfd) != bfd_target_elf_flavour)
   dis_info.isa = CSKY_DEFAULT_ISA;
 else
   {
     mach_flag = elf_elfheader (abfd)->e_flags;

     sec_name = get_elf_backend_data (abfd)->obj_attrs_section;
     /* Skip any input that hasn't attribute section.
        This enables to link object files without attribute section with
        any others.  */
     if (bfd_get_section_by_name (abfd, sec_name) != NULL)
       {
         attr = elf_known_obj_attributes_proc (abfd);
         dis_info.isa = attr[Tag_CSKY_ISA_EXT_FLAGS].i;
         dis_info.isa <<= 32;
         dis_info.isa |= attr[Tag_CSKY_ISA_FLAGS].i;
       }
     else
       dis_info.isa = CSKY_DEFAULT_ISA;
   }

  return print_insn_csky;
}

/* Parse the string of disassembler options.  */
static void
parse_csky_dis_options (const char *opts_in)
{
 char *opts = xstrdup (opts_in);
 char *opt = opts;
 char *opt_end = opts;

 for (; opt_end != NULL; opt = opt_end + 1)
   {
     if ((opt_end = strchr (opt, ',')) != NULL)
       *opt_end = 0;
     if (strcmp (opt, "abi-names") == 0)
       using_abi = 1;
     else
       fprintf (stderr,
                "unrecognized disassembler option: %s", opt);
   }
}

/* Get general register name.  */
static const char *
get_gr_name (int regno)
{
 return csky_get_general_reg_name (mach_flag, regno, using_abi);
}

/* Get control register name.  */
static const char *
get_cr_name (unsigned int regno, int bank)
{
 return csky_get_control_reg_name (mach_flag, bank, regno, using_abi);
}

static int
csky_output_operand (char *str, struct operand const *oprnd,
                    CSKY_INST_TYPE inst, int reloc ATTRIBUTE_UNUSED)
{
 int ret = 0;;
 int bit = 0;
 int result = 0;
 bfd_vma value;
 int mask = oprnd->mask;
 int max = 0;
 char buf[128];

 /* Get operand value with mask.  */
 value = inst & mask;
 for (; mask; mask >>= 1, value >>=1)
   if (mask & 0x1)
     {
       result |= ((value & 0x1) << bit);
       max |= (1 << bit);
       bit++;
     }
 value = result;

 /* Here is general instructions that have no reloc.  */
 switch (oprnd->type)
   {
   case OPRND_TYPE_CTRLREG:
       if (IS_CSKY_V1(mach_flag) && ((value & 0x1f) == 0x1f))
         return -1;
       strcat (str, get_cr_name((value & 0x1f), (value >> 5)));
       break;
   case OPRND_TYPE_DUMMY_REG:
     mask = dis_info.opinfo->oprnd.oprnds[0].mask;
     value = inst & mask;
     for (; mask; mask >>= 1, value >>=1)
       if (mask & 0x1)
         {
           result |= ((value & 0x1) << bit);
           bit++;
         }
     value = result;
     strcat (str, get_gr_name (value));
     break;
   case OPRND_TYPE_GREG0_7:
   case OPRND_TYPE_GREG0_15:
   case OPRND_TYPE_GREG16_31:
   case OPRND_TYPE_REGnsplr:
   case OPRND_TYPE_AREG:
     strcat (str, get_gr_name (value));
     break;
   case OPRND_TYPE_CPREG:
     sprintf (buf, "cpr%d", (int)value);
     strcat (str, buf);
     break;
   case OPRND_TYPE_FREG:
     sprintf (buf, "fr%d", (int)value);
     strcat (str, buf);
     break;
   case OPRND_TYPE_VREG:
     dis_info.value = value;
     sprintf (buf, "vr%d", (int)value);
     strcat (str, buf);
     break;
   case OPRND_TYPE_CPCREG:
     sprintf (buf, "cpcr%d", (int)value);
     strcat (str, buf);
     break;
   case OPRND_TYPE_CPIDX:
     sprintf (buf, "cp%d", (int)value);
     strcat (str, buf);
     break;
   case OPRND_TYPE_IMM2b_JMPIX:
     value = (value + 2) << 3;
     sprintf (buf, "%d", (int)value);
     strcat (str, buf);
     break;
   case OPRND_TYPE_IMM_LDST:
   case OPRND_TYPE_IMM_FLDST:
     value <<= oprnd->shift;
     sprintf (buf, "0x%x", (unsigned int)value);
     strcat (str, buf);
     break;
   case OPRND_TYPE_IMM7b_LS2:
   case OPRND_TYPE_IMM8b_LS2:
     sprintf (buf, "%d", (int)(value << 2));
     strcat (str, buf);
     ret = 0;
     break;
   case OPRND_TYPE_IMM5b_BMASKI:
     if ((value != 0) && (value > 31 || value < 8))
       {
         ret = -1;
         break;
       }
     sprintf (buf, "%d", (int)value);
     strcat (str, buf);
     ret = 0;
     break;
   case OPRND_TYPE_IMM5b_1_31:
     if (value > 31 || value < 1)
       {
         ret = -1;
         break;
       }
     sprintf (buf, "%d", (int)value);
     strcat (str, buf);
     ret = 0;
     break;
   case OPRND_TYPE_IMM5b_7_31:
     if (value > 31 || value < 7)
       {
         ret = -1;
         break;
       }
     sprintf (buf, "%d", (int)value);
     strcat (str, buf);
     ret = 0;
     break;
   case OPRND_TYPE_IMM5b_VSH:
     {
       char num[128];
       value = ((value & 0x1) << 4) | (value >> 1);
       sprintf (num, "%d", (int)value);
       strcat (str, num);
       ret = 0;
       break;
     }
   case OPRND_TYPE_MSB2SIZE:
   case OPRND_TYPE_LSB2SIZE:
     {
       static int size;
       if (oprnd->type == OPRND_TYPE_MSB2SIZE)
         size = value;
       else
         {
           str[strlen (str) - 2] = '\0';
           sprintf (buf, "%d, %d", (int)(size + value), (int)value);
           strcat (str, buf);
         }
       break;
     }
   case OPRND_TYPE_IMM1b:
   case OPRND_TYPE_IMM2b:
   case OPRND_TYPE_IMM4b:
   case OPRND_TYPE_IMM5b:
   case OPRND_TYPE_IMM5b_LS:
   case OPRND_TYPE_IMM7b:
   case OPRND_TYPE_IMM8b:
   case OPRND_TYPE_IMM12b:
   case OPRND_TYPE_IMM15b:
   case OPRND_TYPE_IMM16b:
   case OPRND_TYPE_IMM16b_MOVIH:
   case OPRND_TYPE_IMM16b_ORI:
     sprintf (buf, "%d", (int)value);
     strcat (str, buf);
     ret = 0;
     break;
   case OPRND_TYPE_OFF8b:
   case OPRND_TYPE_OFF16b:
     {
       unsigned char ibytes[4];
       int shift = oprnd->shift;
       int status;
       unsigned int mem_val;

       dis_info.info->stop_vma = 0;

       value = ((dis_info.mem + (value << shift)
                 + ((IS_CSKY_V1 (mach_flag)) ? 2 : 0))
                & 0xfffffffc);
       status = dis_info.info->read_memory_func (value, ibytes, 4,
                                                 dis_info.info);
       if (status != 0)
         {
           dis_info.info->memory_error_func (status, dis_info.mem,
                                             dis_info.info);
           return -1;
         }
       mem_val = csky_chars_to_number (ibytes, 4);
       /* Remove [] around literal value to match ABI syntax.  */
       sprintf (buf, "0x%X", mem_val);
       strcat (str, buf);
       /* For jmpi/jsri, we'll try to get a symbol for the target.  */
       if (dis_info.info->print_address_func && mem_val != 0)
         {
           dis_info.value = mem_val;
           dis_info.need_output_symbol = 1;
         }
       else
         {
           sprintf (buf, "\t// from address pool at 0x%x",
                    (unsigned int)value);
           strcat (str, buf);
         }
       break;
     }
   case OPRND_TYPE_BLOOP_OFF4b:
   case OPRND_TYPE_BLOOP_OFF12b:
   case OPRND_TYPE_OFF11b:
   case OPRND_TYPE_OFF16b_LSL1:
   case OPRND_TYPE_IMM_OFF18b:
   case OPRND_TYPE_OFF26b:
     {
       int shift = oprnd->shift;
       if (value & ((max >> 1) + 1))
         value |= ~max;
       if (is_extern_symbol (dis_info.info, dis_info.mem))
         value = 0;
       else if (IS_CSKY_V1 (mach_flag))
         value = dis_info.mem + 2 + (value << shift);
       else
         value = dis_info.mem + (value << shift);
       dis_info.need_output_symbol = 1;
       dis_info.value= value;
       sprintf (buf, "0x%x", (unsigned int)value);
       strcat (str, buf);
       break;
     }
   case OPRND_TYPE_CONSTANT:
   case OPRND_TYPE_FCONSTANT:
     {
       int shift = oprnd->shift;
       bfd_byte ibytes[8];
       int status;
       bfd_vma addr;
       int nbytes;

       dis_info.info->stop_vma = 0;
       value <<= shift;

       if (IS_CSKY_V1 (mach_flag))
         addr = (dis_info.mem + 2 + value) & 0xfffffffc;
       else
         addr = (dis_info.mem + value) & 0xfffffffc;

       if (oprnd->type == OPRND_TYPE_FCONSTANT
           && dis_info.opinfo->opcode != CSKYV2_INST_FLRW)
         nbytes = 8;
       else
         nbytes = 4;

       status = dis_info.info->read_memory_func (addr, ibytes,
                                                 nbytes, dis_info.info);
       if (status != 0)
         /* Address out of bounds.  -> lrw rx, [pc, 0ffset]. */
         sprintf (buf, "[pc, %d]\t// from address pool at %x", (int)value,
                  (unsigned int)addr);
       else if (oprnd->type == OPRND_TYPE_FCONSTANT)
         {
           double f;

           if (dis_info.opinfo->opcode == CSKYV2_INST_FLRW)
             /* flrws.  */
             floatformat_to_double ((dis_info.info->endian == BFD_ENDIAN_BIG
                                     ? &floatformat_ieee_single_big
                                     : &floatformat_ieee_single_little),
                                    ibytes, &f);
           else
             floatformat_to_double ((dis_info.info->endian == BFD_ENDIAN_BIG
                                     ? &floatformat_ieee_double_big
                                     : &floatformat_ieee_double_little),
                                    ibytes, &f);
           sprintf (buf, "%.7g", f);
         }
       else
         {
           dis_info.value = addr;
           dis_info.need_output_symbol = 1;
           value = csky_chars_to_number (ibytes, 4);
           sprintf (buf, "0x%x", (unsigned int) value);
         }

       strcat (str, buf);
       break;
     }
   case OPRND_TYPE_ELRW_CONSTANT:
     {
       int shift = oprnd->shift;
       char ibytes[4];
       int status;
       bfd_vma addr;
       dis_info.info->stop_vma = 0;

       value = 0x80 + ((~value) & 0x7f);

       value = value << shift;
       addr = (dis_info.mem + value) & 0xfffffffc;

       status = dis_info.info->read_memory_func (addr, (bfd_byte *)ibytes,
                                                 4, dis_info.info);
       if (status != 0)
         /* Address out of bounds.  -> lrw rx, [pc, 0ffset]. */
         sprintf (buf, "[pc, %d]\t// from address pool at %x", (int) value,
                  (unsigned int)addr);
       else
         {
           dis_info.value = addr;
           value = csky_chars_to_number ((unsigned char *)ibytes, 4);
           dis_info.need_output_symbol = 1;
           sprintf (buf, "0x%x", (unsigned int)value);
         }

       strcat (str, buf);
       break;
     }
   case OPRND_TYPE_SFLOAT:
   case OPRND_TYPE_DFLOAT:
     {
       /* This is for fmovis/fmovid, which have an internal 13-bit
          encoding that they convert to single/double precision
          (respectively).  We'll convert the 13-bit encoding to an IEEE
          double and then to host double format to print it.
          Sign bit: bit 20.
          4-bit exponent: bits 19:16, biased by 11.
          8-bit mantissa: split between 24:21 and 7:4.  */
       uint64_t imm4;
       uint64_t imm8;
       uint64_t dbnum;
       unsigned char valbytes[8];
       double fvalue;

       imm4 = ((inst >> 16) & 0xf);
       imm4 = (uint64_t)(1023 - (imm4 - 11)) << 52;

       imm8 = (uint64_t)((inst >> 4) & 0xf) << 44;
       imm8 |= (uint64_t)((inst >> 21) & 0xf) << 48;

       dbnum = (uint64_t)((inst >> 20) & 1) << 63;
       dbnum |= imm4 | imm8;

       /* Do this a byte at a time so we don't have to
          worry about the host's endianness.  */
       valbytes[0] = dbnum & 0xff;
       valbytes[1] = (dbnum >> 8) & 0xff;
       valbytes[2] = (dbnum >> 16) & 0xff;
       valbytes[3] = (dbnum >> 24) & 0xff;
       valbytes[4] = (dbnum >> 32) & 0xff;
       valbytes[5] = (dbnum >> 40) & 0xff;
       valbytes[6] = (dbnum >> 48) & 0xff;
       valbytes[7] = (dbnum >> 56) & 0xff;

       floatformat_to_double (&floatformat_ieee_double_little, valbytes,
                              &fvalue);

       sprintf (buf, "%.7g", fvalue);
       strcat (str, buf);
       break;
     }
   case OPRND_TYPE_HFLOAT_FMOVI:
   case OPRND_TYPE_SFLOAT_FMOVI:
     {
       int imm4;
       int imm8;
       imm4 = ((inst >> 16) & 0xf);
       imm4 = (138 - imm4) << 23;

       imm8 = ((inst >> 8) & 0x3);
       imm8 |= (((inst >> 20) & 0x3f) << 2);
       imm8 <<= 15;

       value = ((inst >> 5) & 1) << 31;
       value |= imm4 | imm8;

       imm4 = 138 - (imm4 >> 23);
       imm8 >>= 15;
       if ((inst >> 5) & 1)
         {
           imm8 = 0 - imm8;
         }

       float f = 0;
       memcpy (&f, &value, sizeof (float));
       sprintf (buf, "%.7g\t// imm9:%4d, imm4:%2d", f, imm8, imm4);
       strcat (str, buf);

       break;
     }

   case OPRND_TYPE_DFLOAT_FMOVI:
     {
       uint64_t imm4;
       uint64_t imm8;
       uint64_t dvalue;
       imm4 = ((inst >> 16) & 0xf);
       imm4 = (1034 - imm4) << 52;

       imm8 = ((inst >> 8) & 0x3);
       imm8 |= (((inst >> 20) & 0x3f) << 2);
       imm8 <<= 44;

       dvalue = (((uint64_t)inst >> 5) & 1) << 63;
       dvalue |= imm4 | imm8;

       imm4 = 1034 - (imm4 >> 52);
       imm8 >>= 44;
       if (inst >> 5)
         {
           imm8 = 0 - imm8;
         }
       double d = 0;
       memcpy (&d, &dvalue, sizeof (double));
       sprintf (buf, "%.7g\t// imm9:%4ld, imm4:%2ld", d, (long) imm8, (long) imm4);
       strcat (str, buf);

       break;
     }
   case OPRND_TYPE_LABEL_WITH_BRACKET:
     sprintf (buf, "[0x%x]", (unsigned int)value);
     strcat (str, buf);
     strcat (str, "\t// the offset is based on .data");
     break;
   case OPRND_TYPE_OIMM3b:
   case OPRND_TYPE_OIMM4b:
   case OPRND_TYPE_OIMM5b:
   case OPRND_TYPE_OIMM5b_IDLY:
   case OPRND_TYPE_OIMM8b:
   case OPRND_TYPE_OIMM12b:
   case OPRND_TYPE_OIMM16b:
   case OPRND_TYPE_OIMM18b:
     value += 1;
     sprintf (buf, "%d", (int)value);
     strcat (str, buf);
     break;
   case OPRND_TYPE_OIMM5b_BMASKI:
     if (value > 32 || value < 16)
       {
         ret = -1;
         break;
       }
     sprintf (buf, "%d", (int)(value + 1));
     strcat (str, buf);
     ret = 0;
     break;
   case OPRND_TYPE_FREGLIST_DASH:
     if (IS_CSKY_V2 (mach_flag))
       {
         int vrx = 0;
         int vry = 0;
         if (dis_info.isa & CSKY_ISA_FLOAT_7E60
             && (strstr (str, "fstm") != NULL
                 || strstr (str, "fldm") != NULL))
           {
             vrx = value & 0x1f;
             vry = vrx + (value >> 5);
           }
         else
           {
             vrx = value & 0xf;
             vry = vrx + (value >> 4);
           }
         sprintf (buf, "fr%d-fr%d", vrx, vry);
         strcat (str, buf);
       }
     break;
   case OPRND_TYPE_REGLIST_DASH:
     if (IS_CSKY_V1 (mach_flag))
       {
         sprintf (buf, "%s-r15", get_gr_name (value));
         strcat (str, buf);
       }
     else
       {
         if ((value & 0x1f) + (value >> 5) > 31)
           {
             ret = -1;
             break;
           }
         strcat (str, get_gr_name ((value >> 5)));
         strcat (str, "-");
         strcat (str, get_gr_name ((value & 0x1f) + (value >> 5)));
       }
     break;
   case OPRND_TYPE_PSR_BITS_LIST:
     {
       struct psrbit const *bits;
       int first_oprnd = true;
       int i = 0;
       if (IS_CSKY_V1 (mach_flag))
         {
           if (value == 0)
             {
               strcat (str, "af");
               break;
             }
           bits = cskyv1_psr_bits;
         }
       else
         bits = cskyv2_psr_bits;
       while (value != 0 && bits[i].name != NULL)
           {
             if (value & bits[i].value)
               {
                 if (!first_oprnd)
                   strcat (str, ", ");
                 strcat (str, bits[i].name);
                 value &= ~bits[i].value;
                 first_oprnd = false;
               }
             i++;
           }
       break;
     }
   case OPRND_TYPE_REGbsp:
     if (IS_CSKY_V1 (mach_flag))
       sprintf(buf, "(%s)", get_gr_name (0));
     else
       sprintf(buf, "(%s)", get_gr_name (14));
     strcat (str, buf);
     break;
   case OPRND_TYPE_REGsp:
     if (IS_CSKY_V1 (mach_flag))
       strcat (str, get_gr_name (0));
     else
       strcat (str, get_gr_name (14));
     break;
   case OPRND_TYPE_REGnr4_r7:
   case OPRND_TYPE_AREG_WITH_BRACKET:
     strcat (str, "(");
     strcat (str, get_gr_name (value));
     strcat (str, ")");
     break;
   case OPRND_TYPE_AREG_WITH_LSHIFT:
     strcat (str, get_gr_name (value >> 5));
     strcat (str, " << ");
     if ((value & 0x1f) == 0x1)
       strcat (str, "0");
     else if ((value & 0x1f) == 0x2)
       strcat (str, "1");
     else if ((value & 0x1f) == 0x4)
       strcat (str, "2");
     else if ((value & 0x1f) == 0x8)
       strcat (str, "3");
     break;
   case OPRND_TYPE_AREG_WITH_LSHIFT_FPU:
     strcat (str, get_gr_name (value >> 2));
     strcat (str, " << ");
     if ((value & 0x3) == 0x0)
       strcat (str, "0");
     else if ((value & 0x3) == 0x1)
       strcat (str, "1");
     else if ((value & 0x3) == 0x2)
       strcat (str, "2");
     else if ((value & 0x3) == 0x3)
       strcat (str, "3");
     break;
   case OPRND_TYPE_VREG_WITH_INDEX:
     {
       unsigned freg_val = value & 0xf;
       unsigned index_val = (value >> 4) & 0xf;
       sprintf (buf, "vr%d[%d]", freg_val, index_val);
       strcat(str, buf);
       break;
     }
   case OPRND_TYPE_FREG_WITH_INDEX:
     {
       unsigned freg_val = value & 0xf;
       unsigned index_val = (value >> 4) & 0xf;
       sprintf (buf, "fr%d[%d]", freg_val, index_val);
       strcat(str, buf);
       break;
     }
   case OPRND_TYPE_REGr4_r7:
     if (IS_CSKY_V1 (mach_flag))
       {
         sprintf (buf, "%s-%s", get_gr_name (4), get_gr_name (7));
         strcat (str, buf);
       }
     break;
   case OPRND_TYPE_CONST1:
     strcat (str, "1");
     break;
   case OPRND_TYPE_REG_r1a:
   case OPRND_TYPE_REG_r1b:
     strcat (str, get_gr_name (1));
     break;
   case OPRND_TYPE_REG_r28:
     strcat (str, get_gr_name (28));
     break;
   case OPRND_TYPE_REGLIST_DASH_COMMA:
     /* 16-bit reglist.  */
     if (value & 0xf)
       {
         strcat (str, get_gr_name (4));
         if ((value & 0xf) > 1)
           {
             strcat (str, "-");
             strcat (str, get_gr_name ((value & 0xf) + 3));
           }
         if (value & ~0xf)
           strcat (str, ", ");
       }
     if (value & 0x10)
       {
         /* r15.  */
         strcat (str, get_gr_name (15));
         if (value & ~0x1f)
           strcat (str, ", ");
       }
     if (dis_info.opinfo->oprnd.oprnds[0].mask != OPRND_MASK_0_4)
       {
         /* 32bits reglist.  */
         value >>= 5;
         if (value & 0x3)
           {
             strcat (str, get_gr_name (16));
             if ((value & 0x7) > 1)
               {
                 strcat (str, "-");
                 strcat (str, get_gr_name ((value & 0x7) + 15));
               }
             if (value & ~0x7)
               strcat (str, ", ");
             }
         if (value & 0x8)
           /* r15.  */
           strcat (str, get_gr_name (28));
       }
     break;
   case OPRND_TYPE_UNCOND10b:
   case OPRND_TYPE_UNCOND16b:
   case OPRND_TYPE_COND10b:
   case OPRND_TYPE_COND16b:
     {
       int shift = oprnd->shift;

       if (value & ((max >> 1) + 1))
         value |= ~max;
       if (is_extern_symbol (dis_info.info, dis_info.mem))
         value = 0;
       else
         value = dis_info.mem + (value << shift);
       sprintf (buf, "0x%x", (unsigned int)value);
       strcat (str, buf);
       dis_info.need_output_symbol = 1;
       dis_info.value = value;
     }
     break;

   default:
     ret = -1;
     break;
   }
 return ret;
}

static int
csky_print_operand (char *str, struct operand const *oprnd,
                   CSKY_INST_TYPE inst, int reloc)
{
 int ret = -1;
 char *lc = "";
 char *rc = "";
 if (oprnd->mask == HAS_SUB_OPERAND)
   {
     struct soperand *sop = (struct soperand *)oprnd;
     if (oprnd->type == OPRND_TYPE_BRACKET)
       {
         lc = "(";
         rc = ")";
       }
     else if (oprnd->type == OPRND_TYPE_ABRACKET)
       {
         lc = "<";
         rc = ">";
       }
     strcat (str, lc);
     ret = csky_print_operand (str, &sop->subs[0], inst, reloc);
     if (ret)
       return ret;
     strcat (str, ", ");
     ret = csky_print_operand (str, &sop->subs[1], inst, reloc);
     strcat (str, rc);
     return ret;
   }
 return csky_output_operand (str, oprnd, inst, reloc);
}

static int
csky_print_operands (char *str, struct csky_opcode_info const *pinfo,
                    struct disassemble_info *info, CSKY_INST_TYPE inst,
                    int reloc)
{
 int i = 0;
 int ret = 0;
 if (pinfo->operand_num)
   strcat (str, "      \t");
 if (pinfo->operand_num == -1)
   {
     ret = csky_print_operand (str, &pinfo->oprnd.oprnds[i], inst, reloc);
     if (ret)
       return ret;
   }
 else
   for (; i < pinfo->operand_num; i++)
     {
       if (i != 0)
         strcat (str, ", ");
       ret = csky_print_operand (str, &pinfo->oprnd.oprnds[i], inst, reloc);
       if (ret)
         return ret;
     }
 info->fprintf_func (info->stream, "%s", str);
 if (dis_info.need_output_symbol)
   {
     info->fprintf_func (info->stream, "\t// ");
     info->print_address_func (dis_info.value, dis_info.info);
   }
 return 0;
}

static void
number_to_chars_littleendian (char *buf, CSKY_INST_TYPE val, int n)
{
 if (n <= 0)
   abort ();
 while (n--)
   {
     *buf++ = val & 0xff;
     val >>= 8;
   }
}

#define CSKY_READ_DATA()                                        \
{                                                               \
 status = info->read_memory_func (memaddr, buf, 2, info);      \
 if (status)                                                   \
   {                                                           \
     info->memory_error_func (status, memaddr, info);          \
     return -1;                                                \
   }                                                           \
 if (info->endian == BFD_ENDIAN_BIG)                           \
   inst |= (buf[0] << 8) | buf[1];                             \
 else if (info->endian == BFD_ENDIAN_LITTLE)                   \
   inst |= (buf[1] << 8) | buf[0];                             \
 else                                                          \
   abort();                                                    \
 info->bytes_per_chunk += 2;                                   \
 memaddr += 2;                                                 \
}

int
print_insn_csky (bfd_vma memaddr, struct disassemble_info *info)
{
 unsigned char buf[4];
 CSKY_INST_TYPE inst = 0;
 int status;
 char str[256];
 unsigned long given;
 int is_data = false;
 void (*printer) (bfd_vma, struct disassemble_info *, long);
 unsigned int  size = 4;

 memset (str, 0, sizeof (str));
 info->bytes_per_chunk = 0;
 info->bytes_per_chunk = 0;
 dis_info.mem = memaddr;
 dis_info.info = info;
 dis_info.need_output_symbol = 0;

 if (info->disassembler_options)
   {
     parse_csky_dis_options (info->disassembler_options);
     info->disassembler_options = NULL;
   }

 if (mach_flag != INIT_MACH_FLAG && mach_flag != BINARY_MACH_FLAG)
   info->mach = mach_flag;
 else if (mach_flag == INIT_MACH_FLAG)
   {
     mach_flag = info->mach;
     dis_info.isa = CSKY_DEFAULT_ISA;
   }

 if (mach_flag == BINARY_MACH_FLAG && info->endian == BFD_ENDIAN_UNKNOWN)
   {
     info->endian = BFD_ENDIAN_LITTLE;
     dis_info.isa = CSKY_DEFAULT_ISA;
   }

 /* First check the full symtab for a mapping symbol, even if there
    are no usable non-mapping symbols for this address.  */
 if (info->symtab_size != 0
     && bfd_asymbol_flavour (*info->symtab) == bfd_target_elf_flavour)
   {
     bfd_vma addr;
     int n;
     int last_sym = -1;
     enum sym_type type = CUR_TEXT;

     if (memaddr <= last_map_addr)
       last_map_sym = -1;
     /* Start scanning at the start of the function, or wherever
        we finished last time.  */
     n = 0;
     if (n < last_map_sym)
       n = last_map_sym;

     /* Scan up to the location being disassembled.  */
     for (; n < info->symtab_size; n++)
       {
         addr = bfd_asymbol_value (info->symtab[n]);
         if (addr > memaddr)
           break;
         if ((info->section == NULL
              || info->section == info->symtab[n]->section)
             && get_sym_code_type (info, n, &type))
           last_sym = n;
       }
     last_map_sym = last_sym;
     last_type = type;
     is_data = (last_type == CUR_DATA);
     if (is_data)
       {
         size = 4 - ( memaddr & 3);
         for (n = last_sym + 1; n < info->symtab_size; n++)
           {
             addr = bfd_asymbol_value (info->symtab[n]);
             if (addr > memaddr)
               {
                 if (addr - memaddr < size)
                   size = addr - memaddr;
                 break;
               }
           }
         /* If the next symbol is after three bytes, we need to
            print only part of the data, so that we can use either
            .byte or .short.  */
         if (size == 3)
           size = (memaddr & 1) ? 1 : 2;
       }
   }
 info->bytes_per_line = 4;

 if (is_data)
   {
     int i;

     /* Size was already set above.  */
     info->bytes_per_chunk = size;
     printer = print_insn_data;

     status = info->read_memory_func (memaddr, (bfd_byte *) buf, size, info);
     given = 0;
     if (info->endian == BFD_ENDIAN_LITTLE)
       for (i = size - 1; i >= 0; i--)
         given = buf[i] | (given << 8);
     else
       for (i = 0; i < (int) size; i++)
         given = buf[i] | (given << 8);

     printer (memaddr, info, given);
     return info->bytes_per_chunk;
   }

 /* Handle instructions.  */
 CSKY_READ_DATA();
 if ((inst & 0xc000) == 0xc000 && IS_CSKY_V2 (mach_flag))
   {
     /* It's a 32-bit instruction.  */
     inst <<= 16;
     CSKY_READ_DATA();
     if (info->buffer && (info->endian == BFD_ENDIAN_LITTLE))
       {
         char* src = (char *)(info->buffer
                              + ((memaddr - 4 - info->buffer_vma)
                                 * info->octets_per_byte));
         if (info->endian == BFD_ENDIAN_LITTLE)
           number_to_chars_littleendian (src, inst, 4);
       }
   }

 if (IS_CSKY_V1 (mach_flag))
   g_opcodeP = csky_v1_opcodes;
 else
   g_opcodeP = csky_v2_opcodes;

 do
   {
     struct csky_opcode const *op;
     struct csky_opcode_info const *pinfo = NULL;
     int reloc;

     memset (str, 0, sizeof (str));
     op = csky_find_inst_info (&pinfo, inst, info->bytes_per_chunk);
     if (!op)
       {
         if (IS_CSKY_V1 (mach_flag))
           info->fprintf_func (info->stream, ".short: 0x%04x",
                               (unsigned short)inst);
         else
           info->fprintf_func (info->stream, ".long: 0x%08x",
                               (unsigned int)inst);
         return info->bytes_per_chunk;
       }

     if (info->bytes_per_chunk == 2)
       reloc = op->reloc16;
     else
       reloc = op->reloc32;
     dis_info.opinfo = pinfo;
     strcat (str, op->mnemonic);

     if (csky_print_operands (str, pinfo, info, inst, reloc))
       g_opcodeP++;
     else
       break;
   } while (1);

 return info->bytes_per_chunk;
}

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