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/* Print VAX instructions for GDB, the GNU debugger.
Copyright 1986, 1989, 1991 Free Software Foundation, Inc.
This file is part of GDB.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include "defs.h"
#include "symtab.h"
#include "opcode/vax.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 ();
/* 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;
}
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