arm-dis.c

基于4个mips核的noc设计

/* Instruction printing code for the ARM
   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
   Free Software Foundation, Inc.
   Contributed by Richard Earnshaw ([e-mail])
   Modification by James G. Smith ([e-mail])

This file is part of libopcodes. 

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version. 

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
more details. 

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "sysdep.h"
#include "dis-asm.h"
#define DEFINE_TABLE
#include "arm-opc.h"
#include "coff/internal.h"
#include "libcoff.h"
#include "opintl.h"

/* FIXME: This shouldn't be done here */
#include "elf-bfd.h"
#include "elf/internal.h"
#include "elf/arm.h"

#ifndef streq
#define streq(a,b)	(strcmp ((a), (b)) == 0)
#endif

#ifndef strneq
#define strneq(a,b,n)	(strncmp ((a), (b), (n)) == 0)
#endif

#ifndef NUM_ELEM
#define NUM_ELEM(a)     (sizeof (a) / sizeof (a)[0])
#endif

static char * arm_conditional[] =
{"eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
 "hi", "ls", "ge", "lt", "gt", "le", "", "nv"};

typedef struct
{
  const char * name;
  const char * description;
  const char * reg_names[16];
}
arm_regname;

static arm_regname regnames[] =
{
  { "raw" , "Select raw register names",
    { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"}},
  { "gcc",  "Select register names used by GCC",
    { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "sl",  "fp",  "ip",  "sp",  "lr",  "pc" }},
  { "std",  "Select register names used in ARM's ISA documentation",
    { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "sp",  "lr",  "pc" }},
  { "apcs", "Select register names used in the APCS",
    { "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4", "v5", "v6", "sl",  "fp",  "ip",  "sp",  "lr",  "pc" }},
  { "atpcs", "Select register names used in the ATPCS",
    { "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4", "v5", "v6", "v7",  "v8",  "IP",  "SP",  "LR",  "PC" }},
  { "special-atpcs", "Select special register names used in the ATPCS",
    { "a1", "a2", "a3", "a4", "v1", "v2", "v3", "WR", "v5", "SB", "SL",  "FP",  "IP",  "SP",  "LR",  "PC" }}
};

/* Default to GCC register name set.  */
static unsigned int regname_selected = 1;

#define NUM_ARM_REGNAMES  NUM_ELEM (regnames)
#define arm_regnames      regnames[regname_selected].reg_names

static boolean force_thumb = false;

static char * arm_fp_const[] =
{"0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0"};

static char * arm_shift[] = 
{"lsl", "lsr", "asr", "ror"};

/* Forward declarations.  */
static void arm_decode_shift PARAMS ((long, fprintf_ftype, void *));
static int  print_insn_arm   PARAMS ((bfd_vma, struct disassemble_info *, long));
static int  print_insn_thumb PARAMS ((bfd_vma, struct disassemble_info *, long));
static void parse_disassembler_options PARAMS ((char *));
static int  print_insn       PARAMS ((bfd_vma, struct disassemble_info *, boolean));
int get_arm_regname_num_options (void);
int set_arm_regname_option (int option);
int get_arm_regnames (int option, const char **setname,
		      const char **setdescription,
		      const char ***register_names);

/* Functions. */
int
get_arm_regname_num_options (void)
{
  return NUM_ARM_REGNAMES;
}

int
set_arm_regname_option (int option)
{
  int old = regname_selected;
  regname_selected = option;
  return old;
}

int
get_arm_regnames (int option, const char **setname,
		  const char **setdescription,
                  const char ***register_names)
{
  *setname = regnames[option].name;
  *setdescription = regnames[option].description;
  *register_names = regnames[option].reg_names;
  return 16;
}

static void
arm_decode_shift (given, func, stream)
     long given;
     fprintf_ftype func;
     void * stream;
{
  func (stream, "%s", arm_regnames[given & 0xf]);
  
  if ((given & 0xff0) != 0)
    {
      if ((given & 0x10) == 0)
	{
	  int amount = (given & 0xf80) >> 7;
	  int shift = (given & 0x60) >> 5;
	  
	  if (amount == 0)
	    {
	      if (shift == 3)
		{
		  func (stream, ", rrx");
		  return;
		}
	      
	      amount = 32;
	    }
	  
	  func (stream, ", %s #%d", arm_shift[shift], amount);
	}
      else
	func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5],
	      arm_regnames[(given & 0xf00) >> 8]);
    }
}

/* Print one instruction from PC on INFO->STREAM.
   Return the size of the instruction (always 4 on ARM). */
static int
print_insn_arm (pc, info, given)
     bfd_vma                   pc;
     struct disassemble_info * info;
     long                      given;
{
  struct arm_opcode *  insn;
  void *               stream = info->stream;
  fprintf_ftype        func   = info->fprintf_func;

  for (insn = arm_opcodes; insn->assembler; insn++)
    {
      if ((given & insn->mask) == insn->value)
	{
	  char * c;
	  
	  for (c = insn->assembler; *c; c++)
	    {
	      if (*c == '%')
		{
		  switch (*++c)
		    {
		    case '%':
		      func (stream, "%%");
		      break;

		    case 'a':
		      if (((given & 0x000f0000) == 0x000f0000)
			  && ((given & 0x02000000) == 0))
			{
			  int offset = given & 0xfff;
			  
			  func (stream, "[pc");
 
			  if (given & 0x01000000)
			    {
			      if ((given & 0x00800000) == 0)
				offset = - offset;
			  
			      /* pre-indexed */
			      func (stream, ", #%x]", offset);

			      offset += pc + 8;

			      /* Cope with the possibility of write-back
				 being used.  Probably a very dangerous thing
				 for the programmer to do, but who are we to
				 argue ?  */
			      if (given & 0x00200000)
				func (stream, "!");
			    }
			  else
			    {
			      /* Post indexed.  */
			      func (stream, "], #%x", offset);

			      offset = pc + 8;  /* ie ignore the offset.  */
			    }
			  
			  func (stream, "\t; ");
			  info->print_address_func (offset, info);
			}
		      else
			{
			  func (stream, "[%s", 
				arm_regnames[(given >> 16) & 0xf]);
			  if ((given & 0x01000000) != 0)
			    {
			      if ((given & 0x02000000) == 0)
				{
				  int offset = given & 0xfff;
				  if (offset)
				    func (stream, ", %s#%d",
					  (((given & 0x00800000) == 0)
					   ? "-" : ""), offset);
				}
			      else
				{
				  func (stream, ", %s",
					(((given & 0x00800000) == 0)
					 ? "-" : ""));
				  arm_decode_shift (given, func, stream);
				}

			      func (stream, "]%s", 
				    ((given & 0x00200000) != 0) ? "!" : "");
			    }
			  else
			    {
			      if ((given & 0x02000000) == 0)
				{
				  int offset = given & 0xfff;
				  if (offset)
				    func (stream, "], %s#%d",
					  (((given & 0x00800000) == 0)
					   ? "-" : ""), offset);
				  else 
				    func (stream, "]");
				}
			      else
				{
				  func (stream, "], %s",
					(((given & 0x00800000) == 0) 
					 ? "-" : ""));
				  arm_decode_shift (given, func, stream);
				}
			    }
			}
		      break;

		    case 's':
                      if ((given & 0x004f0000) == 0x004f0000)
			{
                          /* PC relative with immediate offset.  */
			  int offset = ((given & 0xf00) >> 4) | (given & 0xf);
			  
			  if ((given & 0x00800000) == 0)
			    offset = -offset;
			  
			  func (stream, "[pc, #%x]\t; ", offset);
			  
			  (*info->print_address_func)
			    (offset + pc + 8, info);
			}
		      else
			{
			  func (stream, "[%s", 
				arm_regnames[(given >> 16) & 0xf]);
			  if ((given & 0x01000000) != 0)
			    {
                              /* Pre-indexed.  */
			      if ((given & 0x00400000) == 0x00400000)
				{
                                  /* Immediate.  */
                                  int offset = ((given & 0xf00) >> 4) | (given & 0xf);
				  if (offset)
				    func (stream, ", %s#%d",
					  (((given & 0x00800000) == 0)
					   ? "-" : ""), offset);
				}
			      else
				{
                                  /* Register.  */
				  func (stream, ", %s%s",
					(((given & 0x00800000) == 0)
					 ? "-" : ""),
                                        arm_regnames[given & 0xf]);
				}

			      func (stream, "]%s", 
				    ((given & 0x00200000) != 0) ? "!" : "");
			    }
			  else
			    {
                              /* Post-indexed.  */
			      if ((given & 0x00400000) == 0x00400000)
				{
                                  /* Immediate.  */
                                  int offset = ((given & 0xf00) >> 4) | (given & 0xf);
				  if (offset)
				    func (stream, "], %s#%d",
					  (((given & 0x00800000) == 0)
					   ? "-" : ""), offset);
				  else 
				    func (stream, "]");
				}
			      else
				{
                                  /* Register.  */
				  func (stream, "], %s%s",
					(((given & 0x00800000) == 0)
					 ? "-" : ""),
                                        arm_regnames[given & 0xf]);
				}
			    }
			}
		      break;
			  
		    case 'b':
		      (*info->print_address_func)
			(BDISP (given) * 4 + pc + 8, info);
		      break;

		    case 'c':
		      func (stream, "%s",
			    arm_conditional [(given >> 28) & 0xf]);
		      break;

		    case 'm':
		      {
			int started = 0;
			int reg;

			func (stream, "{");
			for (reg = 0; reg < 16; reg++)
			  if ((given & (1 << reg)) != 0)
			    {
			      if (started)
				func (stream, ", ");
			      started = 1;
			      func (stream, "%s", arm_regnames[reg]);
			    }
			func (stream, "}");
		      }
		      break;

		    case 'o':
		      if ((given & 0x02000000) != 0)
			{
			  int rotate = (given & 0xf00) >> 7;
			  int immed = (given & 0xff);
			  immed = (((immed << (32 - rotate))
				    | (immed >> rotate)) & 0xffffffff);
			  func (stream, "#%d\t; 0x%x", immed, immed);
			}
		      else
			arm_decode_shift (given, func, stream);
		      break;

		    case 'p':
		      if ((given & 0x0000f000) == 0x0000f000)
			func (stream, "p");
		      break;

		    case 't':
		      if ((given & 0x01200000) == 0x00200000)
			func (stream, "t");
		      break;

		    case 'h':
		      if ((given & 0x00000020) == 0x00000020)
			func (stream, "h");
                      else
                        func (stream, "b");
		      break;

		    case 'A':
		      func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]);
		      if ((given & 0x01000000) != 0)
			{
			  int offset = given & 0xff;
			  if (offset)
			    func (stream, ", %s#%d]%s",
				  ((given & 0x00800000) == 0 ? "-" : ""),
				  offset * 4,
				  ((given & 0x00200000) != 0 ? "!" : ""));
			  else
			    func (stream, "]");
			}
		      else
			{
			  int offset = given & 0xff;
			  if (offset)
			    func (stream, "], %s#%d",
				  ((given & 0x00800000) == 0 ? "-" : ""),
				  offset * 4);
			  else
			    func (stream, "]");
			}
		      break;

		    case 'B':
		      /* Print ARM V5 BLX(1) address: pc+25 bits.  */
		      {
			bfd_vma address;
			bfd_vma offset = 0;
			
			if (given & 0x00800000)
			  /* Is signed, hi bits should be ones.  */
			  offset = (-1) ^ 0x00ffffff;

			/* Offset is (SignExtend(offset field)<<2).  */
			offset += given & 0x00ffffff;
			offset <<= 2;
			address = offset + pc + 8;
			
			if (given & 0x01000000)
			  /* H bit allows addressing to 2-byte boundaries.  */
			  address += 2;

		        info->print_address_func (address, info);
		      }
		      break;

		    case 'C':
		      func (stream, "_");
		      if (given & 0x80000)
			func (stream, "f");
		      if (given & 0x40000)
			func (stream, "s");
		      if (given & 0x20000)
			func (stream, "x");
		      if (given & 0x10000)
			func (stream, "c");
		      break;

		    case 'F':
		      switch (given & 0x00408000)
			{
			case 0:
			  func (stream, "4");
			  break;
			case 0x8000:
			  func (stream, "1");
			  break;
			case 0x00400000:
			  func (stream, "2");
			  break;
			default:
			  func (stream, "3");
			}
		      break;
			
		    case 'P':
		      switch (given & 0x00080080)
			{
			case 0:
			  func (stream, "s");
			  break;
			case 0x80:
			  func (stream, "d");
			  break;
			case 0x00080000:
			  func (stream, "e");
			  break;
			default:
			  func (stream, _("<illegal precision>"));
			  break;
			}
		      break;
		    case 'Q':
		      switch (given & 0x00408000)
			{
			case 0:
			  func (stream, "s");
			  break;
			case 0x8000:
			  func (stream, "d");
			  break;
			case 0x00400000:
			  func (stream, "e");
			  break;
			default:
			  func (stream, "p");
			  break;
			}
		      break;
		    case 'R':
		      switch (given & 0x60)
			{
			case 0:
			  break;
			case 0x20:
			  func (stream, "p");
			  break;
			case 0x40:
			  func (stream, "m");
			  break;
			default:
			  func (stream, "z");
			  break;
			}
		      break;

		    case '0': case '1': case '2': case '3': case '4': 
		    case '5': case '6': case '7': case '8': case '9':
		      {
			int bitstart = *c++ - '0';
			int bitend = 0;
			while (*c >= '0' && *c <= '9')
			  bitstart = (bitstart * 10) + *c++ - '0';

			switch (*c)
			  {
			  case '-':
			    c++;
			    
			    while (*c >= '0' && *c <= '9')
			      bitend = (bitend * 10) + *c++ - '0';
			    
			    if (!bitend)
			      abort ();
			    
			    switch (*c)
			      {
			      case 'r':