Add support for the C_SKY series of processors.

This patch series is a new binutils port for C-SKY processors, including support for both the V1 and V2 processor variants.  V1 is derived from the MCore architecture while V2 is substantially different, with mixed 16- and 32-bit instructions, a larger register set, a different (but overlapping) ABI, etc.  There is support for bare-metal ELF targets and Linux with both glibc and uClibc.

This code is being contributed jointly by C-SKY Microsystems and Mentor Graphics.  C-SKY is responsible for the technical content and has proposed Lifang Xia and Yunhai Shang as port maintainers.  (Note that C-SKY does have a corporate copyright assignment on file with the FSF.) Mentor Graphics' role has been cleaning up the code, adding documentation and additional test cases, etc, to address issues we anticipated reviewers would complain about.

bfd     * Makefile.am (ALL_MACHINES, ALL_MACHINES_CFILES): Add C-SKY.
        (BFD32_BACKENDS, BFD_BACKENDS_CFILES): Likewise.
        * Makefile.in: Regenerated.
        * archures.c (enum bfd_architecture): Add bfd_arch_csky and
        related bfd_mach defines.
        (bfd_csky_arch): Declare.
        (bfd_archures_list): Add C-SKY.
        * bfd-in.h (elf32_csky_build_stubs): Declare.
        (elf32_csky_size_stubs): Declare.
        (elf32_csky_next_input_section: Declare.
        (elf32_csky_setup_section_lists): Declare.
        * bfd-in2.h: Regenerated.
        * config.bfd: Add C-SKY.
        * configure.ac: Likewise.
        * configure: Regenerated.
        * cpu-csky.c: New file.
        * elf-bfd.h (enum elf_target_id): Add C-SKY.
        * elf32-csky.c: New file.
        * libbfd.h: Regenerated.
        * reloc.c: Add C-SKY relocations.
        * targets.c (csky_elf32_be_vec, csky_elf32_le_vec): Declare.
        (_bfd_target_vector): Add C-SKY target vector entries.

binutils* readelf.c: Include elf/csky.h.
        (guess_is_rela): Handle EM_CSKY.
        (dump_relocations): Likewise.
        (get_machine_name): Likewise.
        (is_32bit_abs_reloc): Likewise.

include  * dis-asm.h (csky_symbol_is_valid): Declare.
         * opcode/csky.h: New file.

opcodes  * Makefile.am (TARGET_LIBOPCODES_CFILES): Add csky-dis.c.
         * Makefile.in: Regenerated.
         * configure.ac: Add C-SKY.
         * configure: Regenerated.
         * csky-dis.c: New file.
         * csky-opc.h: New file.
         * disassemble.c (ARCH_csky): Define.
         (disassembler, disassemble_init_for_target): Add case for ARCH_csky.
         * disassemble.h (print_insn_csky, csky_get_disassembler): Declare.

gas      * Makefile.am (TARGET_CPU_CFILES): Add entry for C-SKY.
         (TARGET_CPU_HFILES, TARGET_ENV_HFILES): Likewise.
         * Makefile.in: Regenerated.
         * config/tc-csky.c: New file.
         * config/tc-csky.h: New file.
         * config/te-csky_abiv1.h: New file.
         * config/te-csky_abiv1_linux.h: New file.
         * config/te-csky_abiv2.h: New file.
         * config/te-csky_abiv2_linux.h: New file.
         * configure.tgt: Add C-SKY.
         * doc/Makefile.am (CPU_DOCS): Add entry for C-SKY.
         * doc/Makefile.in: Regenerated.
         * doc/all.texi: Set CSKY feature.
         * doc/as.texi (Overview): Add C-SKY options.
         (Machine Dependencies): Likewise.
         * doc/c-csky.texi: New file.
         * testsuite/gas/csky/*: New test cases.

ld      * Makefile.am (ALL_EMULATION_SOURCES): Add C-SKY emulations.
        (ecskyelf.c, ecskyelf_linux.c): New rules.
        * Makefile.in: Regenerated.
        * configure.tgt: Add C-SKY.
        * emulparams/cskyelf.sh: New file.
        * emulparams/cskyelf_linux.sh: New file.
        * emultempl/cskyelf.em: New file.
        * gen-doc.texi: Add C-SKY.
        * ld.texi: Likewise.
        (Options specific to C-SKY targets): New section.
        * testsuite/ld-csky/*: New tests.

1 files changed, 1068 insertions, 0 deletions

diff --git a/opcodes/csky-dis.c b/opcodes/csky-dis.c
new file mode 100644
index 0000000..9c3495f
--- /dev/null
+++ b/opcodes/csky-dis.c
@@ -0,0 +1,1068 @@
+/* C-SKY disassembler.
+   Copyright (C) 1988-2018 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 "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
+
+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;
+  /* 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;
+
+/* 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)
+{
+  if (n == 0)
+    abort ();
+  int i;
+  int val = 0;
+
+  if (dis_info.info->endian == BFD_ENDIAN_BIG)
+    while (n--)
+      val |= buf[n] << (n*8);
+  else
+    for (i = 0; i < n; i++)
+      val |= buf[i] << (i*8);
+  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)
+    {
+      /* 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 bfd_boolean
+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.  */
+
+bfd_boolean
+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)
+{
+  if (abfd != NULL)
+    mach_flag = elf_elfheader (abfd)->e_flags;
+  return print_insn_csky;
+}
+
+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))
+	{
+	  /* In V1 only cr0-cr12 have alias names.  */
+	  if (value <= 12)
+	    strcat (str, csky_ctrl_regs[value].name);
+	  /* Others using crn(n > 12).  */
+	  else if (value <= 30)
+	    {
+	      sprintf (buf, "cr%d", (int)value);
+	      strcat (str, buf);
+	    }
+	  else
+	    return -1;
+	}
+      else
+	{
+	  int sel;
+	  int crx;
+	  sel = value >> 5;
+	  crx = value & 0x1f;
+	  sprintf (buf, "cr<%d, %d>", crx, sel);
+	  strcat (str, buf);
+	}
+      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, csky_general_reg[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:
+      if (IS_CSKY_V2 (mach_flag) && value == 14)
+	strcat (str, "sp");
+      else
+	strcat (str, csky_general_reg[value]);
+      dis_info.value = value;
+      break;
+    case OPRND_TYPE_CPREG:
+      strcat (str, csky_cp_reg[value]);
+      break;
+    case OPRND_TYPE_FREG:
+      sprintf (buf, "fr%d", (int)value);
+      strcat (str, buf);
+      break;
+    case OPRND_TYPE_VREG:
+      sprintf (buf, "vr%d", (int)value);
+      strcat (str, buf);
+      break;
+    case OPRND_TYPE_CPCREG:
+      strcat (str, csky_cp_creg[value]);
+      break;
+    case OPRND_TYPE_CPIDX:
+      strcat (str, csky_cp_idx[value]);
+      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_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_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;
+	char 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, (bfd_byte *)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
+	  {
+	    dis_info.value = addr;
+	    value = csky_chars_to_number ((unsigned char *)ibytes, 4);
+	  }
+
+	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, "%f", f);
+	  }
+	else
+	  {
+	    dis_info.need_output_symbol = 1;
+	    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, "%f", fvalue);
+	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 = value & 0xf;
+	  int 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))
+	{
+	  strcat (str, csky_general_reg[value]);
+	  strcat (str, "-r15");
+	}
+      else
+	{
+	  strcat (str, csky_general_reg[value >> 5]);
+	  strcat (str, "-");
+	  strcat (str, csky_general_reg[(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))
+	strcat (str, "(sp)");
+      else
+	strcat (str, "(sp)");
+      break;
+    case OPRND_TYPE_REGsp:
+      if (IS_CSKY_V1 (mach_flag))
+	strcat (str, "sp");
+      else
+	strcat (str, "sp");
+      break;
+    case OPRND_TYPE_REGnr4_r7:
+    case OPRND_TYPE_AREG_WITH_BRACKET:
+      if (IS_CSKY_V1 (mach_flag) && (value < 4 || value > 7))
+	{
+	  strcat (str, "(");
+	  strcat (str, csky_general_reg[value]);
+	  strcat (str, ")");
+	}
+      else
+	{
+	  strcat (str, "(");
+	  strcat (str, csky_general_reg[value]);
+	  strcat (str, ")");
+	}
+      break;
+    case OPRND_TYPE_AREG_WITH_LSHIFT:
+      strcat (str, csky_general_reg[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, csky_general_reg[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_FREG_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_REGr4_r7:
+      if (IS_CSKY_V1 (mach_flag))
+	strcat (str, "r4-r7");
+      break;
+    case OPRND_TYPE_CONST1:
+      strcat (str, "1");
+      break;
+    case OPRND_TYPE_REG_r1a:
+    case OPRND_TYPE_REG_r1b:
+      strcat (str, "r1");
+      break;
+    case OPRND_TYPE_REG_r28:
+      strcat (str, "r28");
+      break;
+    case OPRND_TYPE_REGLIST_DASH_COMMA:
+      /* 16-bit reglist.  */
+      if (value & 0xf)
+	{
+	  strcat (str, "r4");
+	  if ((value & 0xf) > 1)
+	    {
+	      strcat (str, "-");
+	      strcat (str, csky_general_reg[(value & 0xf) + 3]);
+	    }
+	  if (value & ~0xf)
+	    strcat (str, ", ");
+	}
+      if (value & 0x10)
+	{
+	  /* r15.  */
+	  strcat (str, "r15");
+	  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, "r16");
+	      if ((value & 0x7) > 1)
+		{
+		  strcat (str, "-");
+		  strcat (str, csky_general_reg[(value & 0xf) + 15]);
+		}
+	      if (value & ~0x7)
+		strcat (str, ", ");
+	      }
+	  if (value & 0x8)
+	    /* r15.  */
+	    strcat (str, "r28");
+	}
+      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];
+  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 (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;
+
+  if (mach_flag == BINARY_MACH_FLAG && info->endian == BFD_ENDIAN_UNKNOWN)
+    info->endian = BFD_ENDIAN_LITTLE;
+
+  /* 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;
+}