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/* Print VAX instructions for GDB, the GNU debugger.
Copyright 1986, 1989, 1991, 1992, 1996 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#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])
static unsigned char *print_insn_arg ();
/* Advance PC across any function entry prologue instructions
to reach some "real" code. */
CORE_ADDR
vax_skip_prologue (pc)
CORE_ADDR pc;
{
register int op = (unsigned char) read_memory_integer (pc, 1);
if (op == 0x11)
pc += 2; /* skip brb */
if (op == 0x31)
pc += 3; /* skip brw */
if (op == 0xC2
&& ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E)
pc += 3; /* skip subl2 */
if (op == 0x9E
&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE
&& ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E)
pc += 4; /* skip movab */
if (op == 0x9E
&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE
&& ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E)
pc += 5; /* skip movab */
if (op == 0x9E
&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE
&& ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E)
pc += 7; /* skip movab */
return pc;
}
/* Return number of args passed to a frame.
Can return -1, meaning no way to tell. */
int
vax_frame_num_args (fi)
struct frame_info *fi;
{
return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1));
}
/* Print the vax instruction at address MEMADDR in debugged memory,
from disassembler info INFO.
Returns length of the instruction, in bytes. */
static int
vax_print_insn (memaddr, info)
CORE_ADDR memaddr;
disassemble_info *info;
{
unsigned char buffer[MAXLEN];
register int i;
register unsigned char *p;
register char *d;
int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
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)
{
(*info->fprintf_func) (info->stream, "0%o", buffer[0]);
return 1;
}
(*info->fprintf_func) (info->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)
(*info->fprintf_func) (info->stream, " ");
while (*d)
{
p = print_insn_arg (d, p, memaddr + (p - buffer), info);
d += 2;
if (*d)
(*info->fprintf_func) (info->stream, ",");
}
return p - buffer;
}
static unsigned char *
print_insn_arg (d, p, addr, info)
char *d;
register char *p;
CORE_ADDR addr;
disassemble_info *info;
{
register int regnum = *p & 0xf;
float floatlitbuf;
if (*d == 'b')
{
if (d[1] == 'b')
(*info->fprintf_func) (info->stream, "0x%x", addr + *p++ + 1);
else
{
(*info->fprintf_func) (info->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);
(*info->fprintf_func) (info->stream, "$%f", floatlitbuf);
}
else
(*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f);
break;
case 4: /* Indexed */
p = (char *) print_insn_arg (d, p, addr + 1, info);
(*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum));
break;
case 5: /* Register */
(*info->fprintf_func) (info->stream, REGISTER_NAME (regnum));
break;
case 7: /* Autodecrement */
(*info->fprintf_func) (info->stream, "-");
case 6: /* Register deferred */
(*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum));
break;
case 9: /* Autoincrement deferred */
(*info->fprintf_func) (info->stream, "@");
if (regnum == PC_REGNUM)
{
(*info->fprintf_func) (info->stream, "#");
info->target = *(long *) p;
(*info->print_address_func) (info->target, info);
p += 4;
break;
}
case 8: /* Autoincrement */
if (regnum == PC_REGNUM)
{
(*info->fprintf_func) (info->stream, "#");
switch (d[1])
{
case 'b':
(*info->fprintf_func) (info->stream, "%d", *p++);
break;
case 'w':
(*info->fprintf_func) (info->stream, "%d", *(short *) p);
p += 2;
break;
case 'l':
(*info->fprintf_func) (info->stream, "%d", *(long *) p);
p += 4;
break;
case 'q':
(*info->fprintf_func) (info->stream, "0x%x%08x",
((long *) p)[1], ((long *) p)[0]);
p += 8;
break;
case 'o':
(*info->fprintf_func) (info->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))
(*info->fprintf_func) (info->stream,
"<<invalid float 0x%x>>",
*(int *) p);
else
(*info->fprintf_func) (info->stream, "%f", *(float *) p);
p += 4;
break;
case 'd':
if (INVALID_FLOAT (p, 8))
(*info->fprintf_func) (info->stream,
"<<invalid float 0x%x%08x>>",
((long *) p)[1], ((long *) p)[0]);
else
(*info->fprintf_func) (info->stream, "%f", *(double *) p);
p += 8;
break;
case 'g':
(*info->fprintf_func) (info->stream, "g-float");
p += 8;
break;
case 'h':
(*info->fprintf_func) (info->stream, "h-float");
p += 16;
break;
}
}
else
(*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum));
break;
case 11: /* Byte displacement deferred */
(*info->fprintf_func) (info->stream, "@");
case 10: /* Byte displacement */
if (regnum == PC_REGNUM)
{
info->target = addr + *p + 2;
(*info->print_address_func) (info->target, info);
}
else
(*info->fprintf_func) (info->stream, "%d(%s)", *p, REGISTER_NAME (regnum));
p += 1;
break;
case 13: /* Word displacement deferred */
(*info->fprintf_func) (info->stream, "@");
case 12: /* Word displacement */
if (regnum == PC_REGNUM)
{
info->target = addr + *(short *) p + 3;
(*info->print_address_func) (info->target, info);
}
else
(*info->fprintf_func) (info->stream, "%d(%s)",
*(short *) p, REGISTER_NAME (regnum));
p += 2;
break;
case 15: /* Long displacement deferred */
(*info->fprintf_func) (info->stream, "@");
case 14: /* Long displacement */
if (regnum == PC_REGNUM)
{
info->target = addr + *(short *) p + 5;
(*info->print_address_func) (info->target, info);
}
else
(*info->fprintf_func) (info->stream, "%d(%s)",
*(long *) p, REGISTER_NAME (regnum));
p += 4;
}
return (unsigned char *) p;
}
void
_initialize_vax_tdep ()
{
tm_print_insn = vax_print_insn;
}
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