BSD 4_3_Net_2 release

[unix-history] / usr / src / usr.bin / gdb / config / vax-pinsn.c

/*-
* This code is derived from software copyrighted by the Free Software
* Foundation.
*
* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
*/

#ifndef lint
static char sccsid[] = "@(#)vax-pinsn.c 6.3 (Berkeley) 5/8/91";
#endif /* not lint */

/* Print vax instructions for GDB, the GNU debugger.
  Copyright (C) 1986, 1989 Free Software Foundation, Inc.

This file is part of GDB.

GDB 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 1, or (at your option)
any later version.

GDB 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 GDB; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <stdio.h>

#include "defs.h"
#include "param.h"
#include "symtab.h"
#include "vax-opcode.h"

/* Vax instructions are never longer than this.  */
#define MAXLEN 62

/* Number of elements in the opcode table.  */
#define NOPCODES (sizeof votstrs / sizeof votstrs[0])

extern char *reg_names[];

static unsigned char *print_insn_arg ();
\f
/* Print the vax instruction at address MEMADDR in debugged memory,
  on STREAM.  Returns length of the instruction, in bytes.  */

int
print_insn (memaddr, stream)
    CORE_ADDR memaddr;
    FILE *stream;
{
 unsigned char buffer[MAXLEN];
 register int i;
 register unsigned char *p;
 register char *d;

 read_memory (memaddr, buffer, MAXLEN);

 for (i = 0; i < NOPCODES; i++)
   if (votstrs[i].detail.code == buffer[0]
       || votstrs[i].detail.code == *(unsigned short *)buffer)
     break;

 /* Handle undefined instructions.  */
 if (i == NOPCODES)
   {
     fprintf (stream, "0%o", buffer[0]);
     return 1;
   }

 fprintf (stream, "%s", votstrs[i].name);

 /* Point at first byte of argument data,
    and at descriptor for first argument.  */
 p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
 d = votstrs[i].detail.args;

 if (*d)
   fputc (' ', stream);

 while (*d)
   {
     p = print_insn_arg (d, p, memaddr + (p - buffer), stream);
     d += 2;
     if (*d)
       fprintf (stream, ",");
   }
 return p - buffer;
}

static unsigned char *
print_insn_arg (d, p, addr, stream)
    char *d;
    register char *p;
    CORE_ADDR addr;
    FILE *stream;
{
 register int regnum = *p & 0xf;
 float floatlitbuf;

 if (*d == 'b')
   {
     if (d[1] == 'b')
       fprintf (stream, "0x%x", addr + *p++ + 1);
     else
       {
         fprintf (stream, "0x%x", addr + *(short *)p + 2);
         p += 2;
       }
   }
 else
   switch ((*p++ >> 4) & 0xf)
     {
     case 0:
     case 1:
     case 2:
     case 3:                   /* Literal mode */
       if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h')
         {
           *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
           fprintf (stream, "$%f", floatlitbuf);
         }
       else
         fprintf (stream, "$%d", p[-1] & 0x3f);
       break;

     case 4:                   /* Indexed */
       p = (char *) print_insn_arg (d, p, addr + 1, stream);
       fprintf (stream, "[%s]", reg_names[regnum]);
       break;

     case 5:                   /* Register */
       fprintf (stream, reg_names[regnum]);
       break;

     case 7:                   /* Autodecrement */
       fputc ('-', stream);
     case 6:                   /* Register deferred */
       fprintf (stream, "(%s)", reg_names[regnum]);
       break;

     case 9:                   /* Autoincrement deferred */
       fputc ('@', stream);
       if (regnum == PC_REGNUM)
         {
           fputc ('#', stream);
           print_address (*(long *)p, stream);
           p += 4;
           break;
         }
     case 8:                   /* Autoincrement */
       if (regnum == PC_REGNUM)
         {
           fputc ('#', stream);
           switch (d[1])
             {
             case 'b':
               fprintf (stream, "%d", *p++);
               break;

             case 'w':
               fprintf (stream, "%d", *(short *)p);
               p += 2;
               break;

             case 'l':
               fprintf (stream, "%d", *(long *)p);
               p += 4;
               break;

             case 'q':
               fprintf (stream, "0x%x%08x", ((long *)p)[1], ((long *)p)[0]);
               p += 8;
               break;

             case 'o':
               fprintf (stream, "0x%x%08x%08x%08x",
                        ((long *)p)[3], ((long *)p)[2],
                        ((long *)p)[1], ((long *)p)[0]);
               p += 16;
               break;

             case 'f':
               if (INVALID_FLOAT (p, 4))
                 fprintf (stream, "<<invalid float 0x%x>>", *(int *) p);
               else
                 fprintf (stream, "%f", *(float *) p);
               p += 4;
               break;

             case 'd':
               if (INVALID_FLOAT (p, 8))
                 fprintf (stream, "<<invalid float 0x%x%08x>>",
                          ((long *)p)[1], ((long *)p)[0]);
               else
                 fprintf (stream, "%f", *(double *) p);
               p += 8;
               break;

             case 'g':
               fprintf (stream, "g-float");
               p += 8;
               break;

             case 'h':
               fprintf (stream, "h-float");
               p += 16;
               break;

             }
         }
       else
         fprintf (stream, "(%s)+", reg_names[regnum]);
       break;

     case 11:                  /* Byte displacement deferred */
       fputc ('@', stream);
     case 10:                  /* Byte displacement */
       if (regnum == PC_REGNUM)
         print_address (addr + *p + 2, stream);
       else
         fprintf (stream, "%d(%s)", *p, reg_names[regnum]);
       p += 1;
       break;

     case 13:                  /* Word displacement deferred */
       fputc ('@', stream);
     case 12:                  /* Word displacement */
       if (regnum == PC_REGNUM)
         print_address (addr + *(short *)p + 3, stream);
       else
         fprintf (stream, "%d(%s)", *(short *)p, reg_names[regnum]);
       p += 2;
       break;

     case 15:                  /* Long displacement deferred */
       fputc ('@', stream);
     case 14:                  /* Long displacement */
       if (regnum == PC_REGNUM)
         print_address (addr + *(long *)p + 5, stream);
       else
         fprintf (stream, "%d(%s)", *(long *)p, reg_names[regnum]);
       p += 4;
     }

 return (unsigned char *) p;
}