mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-24 18:44:20 +08:00
307 lines
7.8 KiB
C
307 lines
7.8 KiB
C
/* 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;
|
||
}
|