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/*
* Ported by the State University of New York at Buffalo by the Distributed
* Computer Systems Lab, Department of Computer Science, 1991.
*/
#include <stdio.h>
#include "defs.h"
#include "param.h"
#include "symtab.h"
#include "tahoe-opcode.h"
/* Tahoe 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 Tahoe 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 ('\t', 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;
{
int temp1 = 0;
register int regnum = *p & 0xf;
float floatlitbuf;
if (*d == 'b')
{
if (d[1] == 'b')
fprintf (stream, "0x%x", addr + *p++ + 1);
else
{
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p + 1);
fprintf (stream, "0x%x", addr + temp1 + 2);
p += 2;
}
}
else
switch ((*p++ >> 4) & 0xf)
{
case 0:
case 1:
case 2:
case 3: /* Liter>al(short immediate byte) 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: /* Absolute Address & Autoincrement deferred */
fputc ('*', stream);
if (regnum == PC_REGNUM)
{
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p +1);
fputc ('$', stream);
print_address (temp1, stream);
p += 4;
break;
}
case 8: /*Immediate & Autoincrement SP */
if (regnum == 8) /*88 is Immediate Byte Mode*/
fprintf (stream, "$%d", *p++);
else if (regnum == 9) /*89 is Immediate Word Mode*/
{
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p +1);
fprintf (stream, "$%d", temp1);
p += 2;
}
else if (regnum == PC_REGNUM) /*8F is Immediate Long Mode*/
{
temp1 = *p;
temp1 <<=8;
temp1 |= *(p +1);
temp1 <<=8;
temp1 |= *(p +2);
temp1 <<= 8;
temp1 |= *(p +3);
fprintf (stream, "$%d", temp1);
p += 4;
}
else /*8E is Autoincrement SP Mode*/
fprintf (stream, "(%s)+", reg_names[regnum]);
break;
case 11: /* Register + Byte Displacement Deferred Mode*/
fputc ('*', stream);
case 10: /* Register + Byte Displacement Mode*/
if (regnum == PC_REGNUM)
print_address (addr + *p + 2, stream);
else
fprintf (stream, "%d(%s)", *p, reg_names[regnum]);
p += 1;
break;
case 13: /* Register + Word Displacement Deferred Mode*/
fputc ('*', stream);
case 12: /* Register + Word Displacement Mode*/
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p +1);
if (regnum == PC_REGNUM)
print_address (addr + temp1 + 3, stream);
else
fprintf (stream, "%d(%s)", temp1, reg_names[regnum]);
p += 2;
break;
case 15: /* Register + Long Displacement Deferred Mode*/
fputc ('*', stream);
case 14: /* Register + Long Displacement Mode*/
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p +1);
temp1 <<= 8;
temp1 |= *(p +2);
temp1 <<= 8;
temp1 |= *(p +3);
if (regnum == PC_REGNUM)
print_address (addr + temp1 + 5, stream);
else
fprintf (stream, "%d(%s)", temp1, reg_names[regnum]);
p += 4;
}
return (unsigned char *) p;
}
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