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cell-binutils  2.17cvs20070401
Classes | Defines | Functions | Variables
avr-dis.c File Reference
#include <assert.h>
#include "sysdep.h"
#include "dis-asm.h"
#include "opintl.h"
#include "libiberty.h"
#include "opcode/avr.h"

Go to the source code of this file.

Classes

struct  avr_opcodes_s

Defines

#define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN)   {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},

Functions

static int avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint, char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr)
static unsigned short avrdis_opcode (bfd_vma addr, disassemble_info *info)
int print_insn_avr (bfd_vma addr, disassemble_info *info)

Variables

static const char * comment_start = "0x"

Class Documentation

struct avr_opcodes_s

Definition at line 28 of file tc-avr.c.

Class Members
unsigned int bin_opcode
char * constraints
int insn_size
int isa
char * name
char * opcode

Define Documentation

#define AVR_INSN (   NAME,
  CONSTR,
  OPCODE,
  SIZE,
  ISA,
  BIN 
)    {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},

Definition at line 37 of file avr-dis.c.


Function Documentation

static int avr_operand ( unsigned int  insn,
unsigned int  insn2,
unsigned int  pc,
int  constraint,
char *  buf,
char *  comment,
int  regs,
int sym,
bfd_vma sym_addr 
) [static]

Definition at line 49 of file avr-dis.c.

{
  int ok = 1;
  *sym = 0;

  switch (constraint)
    {
      /* Any register operand.  */
    case 'r':
      if (regs)
       insn = (insn & 0xf) | ((insn & 0x0200) >> 5); /* Source register.  */
      else
       insn = (insn & 0x01f0) >> 4; /* Destination register.  */
      
      sprintf (buf, "r%d", insn);
      break;

    case 'd':
      if (regs)
       sprintf (buf, "r%d", 16 + (insn & 0xf));
      else
       sprintf (buf, "r%d", 16 + ((insn & 0xf0) >> 4));
      break;
      
    case 'w':
      sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3));
      break;
      
    case 'a':
      if (regs)
       sprintf (buf, "r%d", 16 + (insn & 7));
      else
       sprintf (buf, "r%d", 16 + ((insn >> 4) & 7));
      break;

    case 'v':
      if (regs)
       sprintf (buf, "r%d", (insn & 0xf) * 2);
      else
       sprintf (buf, "r%d", ((insn & 0xf0) >> 3));
      break;

    case 'e':
      {
       char *xyz;

       switch (insn & 0x100f)
         {
           case 0x0000: xyz = "Z";  break;
           case 0x1001: xyz = "Z+"; break;
           case 0x1002: xyz = "-Z"; break;
           case 0x0008: xyz = "Y";  break;
           case 0x1009: xyz = "Y+"; break;
           case 0x100a: xyz = "-Y"; break;
           case 0x100c: xyz = "X";  break;
           case 0x100d: xyz = "X+"; break;
           case 0x100e: xyz = "-X"; break;
           default: xyz = "??"; ok = 0;
         }
       sprintf (buf, xyz);

       if (AVR_UNDEF_P (insn))
         sprintf (comment, _("undefined"));
      }
      break;

    case 'z':
      *buf++ = 'Z';
      if (insn & 0x1)
       *buf++ = '+';
      *buf = '\0';
      if (AVR_UNDEF_P (insn))
       sprintf (comment, _("undefined"));
      break;

    case 'b':
      {
       unsigned int x;
       
       x = (insn & 7);
       x |= (insn >> 7) & (3 << 3);
       x |= (insn >> 8) & (1 << 5);
       
       if (insn & 0x8)
         *buf++ = 'Y';
       else
         *buf++ = 'Z';
       sprintf (buf, "+%d", x);
       sprintf (comment, "0x%02x", x);
      }
      break;
      
    case 'h':
      *sym = 1;
      *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2;
      /* See PR binutils/2454.  Ideally we would like to display the hex
        value of the address only once, but this would mean recoding
        objdump_print_address() which would affect many targets.  */
      sprintf (buf, "%#lx", (unsigned long) *sym_addr);      
      sprintf (comment, comment_start);
      break;
      
    case 'L':
      {
       int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2;
       sprintf (buf, ".%+-8d", rel_addr);
        *sym = 1;
        *sym_addr = pc + 2 + rel_addr;
       sprintf (comment, comment_start);
      }
      break;

    case 'l':
      {
       int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;

       sprintf (buf, ".%+-8d", rel_addr);
        *sym = 1;
        *sym_addr = pc + 2 + rel_addr;
       sprintf (comment, comment_start);
      }
      break;

    case 'i':
      sprintf (buf, "0x%04X", insn2);
      break;
      
    case 'M':
      sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
      sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
      break;

    case 'n':
      sprintf (buf, "??");
      fprintf (stderr, _("Internal disassembler error"));
      ok = 0;
      break;
      
    case 'K':
      {
       unsigned int x;

       x = (insn & 0xf) | ((insn >> 2) & 0x30);
       sprintf (buf, "0x%02x", x);
       sprintf (comment, "%d", x);
      }
      break;
      
    case 's':
      sprintf (buf, "%d", insn & 7);
      break;
      
    case 'S':
      sprintf (buf, "%d", (insn >> 4) & 7);
      break;
      
    case 'P':
      {
       unsigned int x;

       x = (insn & 0xf);
       x |= (insn >> 5) & 0x30;
       sprintf (buf, "0x%02x", x);
       sprintf (comment, "%d", x);
      }
      break;

    case 'p':
      {
       unsigned int x;
       
       x = (insn >> 3) & 0x1f;
       sprintf (buf, "0x%02x", x);
       sprintf (comment, "%d", x);
      }
      break;
      
    case '?':
      *buf = '\0';
      break;
      
    default:
      sprintf (buf, "??");
      fprintf (stderr, _("unknown constraint `%c'"), constraint);
      ok = 0;
    }

    return ok;
}

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static unsigned short avrdis_opcode ( bfd_vma  addr,
disassemble_info info 
) [static]

Definition at line 241 of file avr-dis.c.

{
  bfd_byte buffer[2];
  int status;

  status = info->read_memory_func (addr, buffer, 2, info);

  if (status == 0)
    return bfd_getl16 (buffer);

  info->memory_error_func (status, addr, info);
  return -1;
}

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int print_insn_avr ( bfd_vma  addr,
disassemble_info info 
)

Definition at line 257 of file avr-dis.c.

{
  unsigned int insn, insn2;
  const struct avr_opcodes_s *opcode;
  static unsigned int *maskptr;
  void *stream = info->stream;
  fprintf_ftype prin = info->fprintf_func;
  static unsigned int *avr_bin_masks;
  static int initialized;
  int cmd_len = 2;
  int ok = 0;
  char op1[20], op2[20], comment1[40], comment2[40];
  int sym_op1 = 0, sym_op2 = 0;
  bfd_vma sym_addr1, sym_addr2;


  if (!initialized)
    {
      unsigned int nopcodes;

      /* PR 4045: Try to avoid duplicating the 0x prefix that
        objdump_print_addr() will put on addresses when there
        is no symbol table available.  */
      if (info->symtab_size == 0)
       comment_start = " ";

      nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
      
      avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));

      for (opcode = avr_opcodes, maskptr = avr_bin_masks;
          opcode->name;
          opcode++, maskptr++)
       {
         char * s;
         unsigned int bin = 0;
         unsigned int mask = 0;
       
         for (s = opcode->opcode; *s; ++s)
           {
             bin <<= 1;
             mask <<= 1;
             bin |= (*s == '1');
             mask |= (*s == '1' || *s == '0');
           }
         assert (s - opcode->opcode == 16);
         assert (opcode->bin_opcode == bin);
         *maskptr = mask;
       }

      initialized = 1;
    }

  insn = avrdis_opcode (addr, info);
  
  for (opcode = avr_opcodes, maskptr = avr_bin_masks;
       opcode->name;
       opcode++, maskptr++)
    if ((insn & *maskptr) == opcode->bin_opcode)
      break;
  
  /* Special case: disassemble `ldd r,b+0' as `ld r,b', and
     `std b+0,r' as `st b,r' (next entry in the table).  */

  if (AVR_DISP0_P (insn))
    opcode++;

  op1[0] = 0;
  op2[0] = 0;
  comment1[0] = 0;
  comment2[0] = 0;

  if (opcode->name)
    {
      char *op = opcode->constraints;

      insn2 = 0;
      ok = 1;

      if (opcode->insn_size > 1)
       {
         insn2 = avrdis_opcode (addr + 2, info);
         cmd_len = 4;
       }

      if (*op && *op != '?')
       {
         int regs = REGISTER_P (*op);

         ok = avr_operand (insn, insn2, addr, *op, op1, comment1, 0, &sym_op1, &sym_addr1);

         if (ok && *(++op) == ',')
           ok = avr_operand (insn, insn2, addr, *(++op), op2,
                           *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
       }
    }

  if (!ok)
    {
      /* Unknown opcode, or invalid combination of operands.  */
      sprintf (op1, "0x%04x", insn);
      op2[0] = 0;
      sprintf (comment1, "????");
      comment2[0] = 0;
    }

  (*prin) (stream, "%s", ok ? opcode->name : ".word");

  if (*op1)
      (*prin) (stream, "\t%s", op1);

  if (*op2)
    (*prin) (stream, ", %s", op2);

  if (*comment1)
    (*prin) (stream, "\t; %s", comment1);

  if (sym_op1)
    info->print_address_func (sym_addr1, info);

  if (*comment2)
    (*prin) (stream, " %s", comment2);

  if (sym_op2)
    info->print_address_func (sym_addr2, info);

  return cmd_len;
}

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Variable Documentation

const char* comment_start = "0x" [static]

Definition at line 46 of file avr-dis.c.