/src/binutils-gdb/opcodes/csky-dis.c

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/* C-SKY disassembler.
   Copyright (C) 1988-2023 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;
}

Coverage Report

Created: 2023-08-28 06:30