[deliverable/binutils-gdb.git] / gdb / vax-tdep.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 ();
\f
/* Advance PC across any function entry prologue instructions
   to reach some "real" code.  */

CORE_ADDR
vax_skip_prologue (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 (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 (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 (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 (void)
{
  tm_print_insn = vax_print_insn;
}
Commit	Line	Data
c906108c SS	1	/* Print VAX instructions for GDB, the GNU debugger.
	2	Copyright 1986, 1989, 1991, 1992, 1996 Free Software Foundation, Inc.
	3
c5aa993b	4	This file is part of GDB.
c906108c	5
c5aa993b JM	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
c906108c	10
c5aa993b JM	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
c906108c	15
c5aa993b JM	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 59 Temple Place - Suite 330,
	19	Boston, MA 02111-1307, USA. */
c906108c SS	20
	21	#include "defs.h"
	22	#include "symtab.h"
	23	#include "opcode/vax.h"
	24
	25	/* Vax instructions are never longer than this. */
	26	#define MAXLEN 62
	27
	28	/* Number of elements in the opcode table. */
	29	#define NOPCODES (sizeof votstrs / sizeof votstrs[0])
	30
	31	static unsigned char *print_insn_arg ();
	32	\f
b83266a0 SS	33	/* Advance PC across any function entry prologue instructions
	34	to reach some "real" code. */
	35
	36	CORE_ADDR
fba45db2	37	vax_skip_prologue (CORE_ADDR pc)
b83266a0 SS	38	{
	39	register int op = (unsigned char) read_memory_integer (pc, 1);
	40	if (op == 0x11)
c5aa993b	41	pc += 2; /* skip brb */
b83266a0	42	if (op == 0x31)
c5aa993b	43	pc += 3; /* skip brw */
b83266a0	44	if (op == 0xC2
c5aa993b JM	45	&& ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E)
c5aa993b JM	46	pc += 3; /* skip subl2 */
b83266a0	47	if (op == 0x9E
c5aa993b JM	48	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE
	49	&& ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E)
	50	pc += 4; /* skip movab */
b83266a0	51	if (op == 0x9E
c5aa993b JM	52	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE
	53	&& ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E)
	54	pc += 5; /* skip movab */
b83266a0	55	if (op == 0x9E
c5aa993b JM	56	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE
	57	&& ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E)
	58	pc += 7; /* skip movab */
b83266a0 SS	59	return pc;
	60	}
	61
392a587b JM	62	/* Return number of args passed to a frame.
	63	Can return -1, meaning no way to tell. */
	64
	65	int
fba45db2	66	vax_frame_num_args (struct frame_info *fi)
392a587b JM	67	{
	68	return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1));
	69	}
	70
	71
	72
c906108c SS	73	/* Print the vax instruction at address MEMADDR in debugged memory,
	74	from disassembler info INFO.
	75	Returns length of the instruction, in bytes. */
	76
	77	static int
fba45db2	78	vax_print_insn (CORE_ADDR memaddr, disassemble_info *info)
c906108c SS	79	{
	80	unsigned char buffer[MAXLEN];
	81	register int i;
	82	register unsigned char *p;
	83	register char *d;
	84
	85	int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info);
	86	if (status != 0)
	87	{
	88	(*info->memory_error_func) (status, memaddr, info);
	89	return -1;
	90	}
	91
	92	for (i = 0; i < NOPCODES; i++)
	93	if (votstrs[i].detail.code == buffer[0]
c5aa993b	94	\|\| votstrs[i].detail.code == (unsigned short ) buffer)
c906108c SS	95	break;
	96
	97	/* Handle undefined instructions. */
	98	if (i == NOPCODES)
	99	{
	100	(*info->fprintf_func) (info->stream, "0%o", buffer[0]);
	101	return 1;
	102	}
	103
	104	(*info->fprintf_func) (info->stream, "%s", votstrs[i].name);
	105
	106	/* Point at first byte of argument data,
	107	and at descriptor for first argument. */
	108	p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
	109	d = votstrs[i].detail.args;
	110
	111	if (*d)
	112	(*info->fprintf_func) (info->stream, " ");
	113
	114	while (*d)
	115	{
	116	p = print_insn_arg (d, p, memaddr + (p - buffer), info);
	117	d += 2;
	118	if (*d)
	119	(*info->fprintf_func) (info->stream, ",");
	120	}
	121	return p - buffer;
	122	}
	123
	124	static unsigned char *
fba45db2 KB	125	print_insn_arg (char d, register char p, CORE_ADDR addr,
fba45db2 KB	126	disassemble_info *info)
c906108c SS	127	{
	128	register int regnum = *p & 0xf;
	129	float floatlitbuf;
	130
	131	if (*d == 'b')
	132	{
	133	if (d[1] == 'b')
	134	(info->fprintf_func) (info->stream, "0x%x", addr + p++ + 1);
	135	else
	136	{
c5aa993b	137	(info->fprintf_func) (info->stream, "0x%x", addr + (short *) p + 2);
c906108c SS	138	p += 2;
	139	}
	140	}
	141	else
	142	switch ((*p++ >> 4) & 0xf)
	143	{
	144	case 0:
	145	case 1:
	146	case 2:
	147	case 3: /* Literal mode */
	148	if (d[1] == 'd' \|\| d[1] == 'f' \|\| d[1] == 'g' \|\| d[1] == 'h')
	149	{
c5aa993b	150	(int ) &floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
c906108c SS	151	(*info->fprintf_func) (info->stream, "$%f", floatlitbuf);
	152	}
	153	else
	154	(*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f);
	155	break;
	156
	157	case 4: /* Indexed */
	158	p = (char *) print_insn_arg (d, p, addr + 1, info);
	159	(*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum));
	160	break;
	161
	162	case 5: /* Register */
	163	(*info->fprintf_func) (info->stream, REGISTER_NAME (regnum));
	164	break;
	165
	166	case 7: /* Autodecrement */
	167	(*info->fprintf_func) (info->stream, "-");
	168	case 6: /* Register deferred */
	169	(*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum));
	170	break;
	171
	172	case 9: /* Autoincrement deferred */
	173	(*info->fprintf_func) (info->stream, "@");
	174	if (regnum == PC_REGNUM)
	175	{
	176	(*info->fprintf_func) (info->stream, "#");
c5aa993b	177	info->target = (long ) p;
c906108c SS	178	(*info->print_address_func) (info->target, info);
	179	p += 4;
	180	break;
	181	}
	182	case 8: /* Autoincrement */
	183	if (regnum == PC_REGNUM)
	184	{
	185	(*info->fprintf_func) (info->stream, "#");
	186	switch (d[1])
	187	{
	188	case 'b':
	189	(info->fprintf_func) (info->stream, "%d", p++);
	190	break;
	191
	192	case 'w':
c5aa993b	193	(info->fprintf_func) (info->stream, "%d", (short *) p);
c906108c SS	194	p += 2;
	195	break;
	196
	197	case 'l':
c5aa993b	198	(info->fprintf_func) (info->stream, "%d", (long *) p);
c906108c SS	199	p += 4;
	200	break;
	201
	202	case 'q':
	203	(*info->fprintf_func) (info->stream, "0x%x%08x",
c5aa993b	204	((long ) p)[1], ((long ) p)[0]);
c906108c SS	205	p += 8;
	206	break;
	207
	208	case 'o':
	209	(*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x",
c5aa993b JM	210	((long ) p)[3], ((long ) p)[2],
c5aa993b JM	211	((long ) p)[1], ((long ) p)[0]);
c906108c SS	212	p += 16;
	213	break;
	214
	215	case 'f':
	216	if (INVALID_FLOAT (p, 4))
	217	(*info->fprintf_func) (info->stream,
	218	"<<invalid float 0x%x>>",
	219	(int ) p);
	220	else
	221	(info->fprintf_func) (info->stream, "%f", (float *) p);
	222	p += 4;
	223	break;
	224
	225	case 'd':
	226	if (INVALID_FLOAT (p, 8))
	227	(*info->fprintf_func) (info->stream,
	228	"<<invalid float 0x%x%08x>>",
c5aa993b	229	((long ) p)[1], ((long ) p)[0]);
c906108c SS	230	else
	231	(info->fprintf_func) (info->stream, "%f", (double *) p);
	232	p += 8;
	233	break;
	234
	235	case 'g':
	236	(*info->fprintf_func) (info->stream, "g-float");
	237	p += 8;
	238	break;
	239
	240	case 'h':
	241	(*info->fprintf_func) (info->stream, "h-float");
	242	p += 16;
	243	break;
	244
	245	}
	246	}
	247	else
	248	(*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum));
	249	break;
	250
	251	case 11: /* Byte displacement deferred */
	252	(*info->fprintf_func) (info->stream, "@");
	253	case 10: /* Byte displacement */
	254	if (regnum == PC_REGNUM)
	255	{
	256	info->target = addr + *p + 2;
	257	(*info->print_address_func) (info->target, info);
	258	}
	259	else
	260	(info->fprintf_func) (info->stream, "%d(%s)", p, REGISTER_NAME (regnum));
	261	p += 1;
	262	break;
	263
	264	case 13: /* Word displacement deferred */
	265	(*info->fprintf_func) (info->stream, "@");
	266	case 12: /* Word displacement */
	267	if (regnum == PC_REGNUM)
	268	{
c5aa993b	269	info->target = addr + (short ) p + 3;
c906108c SS	270	(*info->print_address_func) (info->target, info);
	271	}
	272	else
	273	(*info->fprintf_func) (info->stream, "%d(%s)",
c5aa993b	274	(short ) p, REGISTER_NAME (regnum));
c906108c SS	275	p += 2;
	276	break;
	277
	278	case 15: /* Long displacement deferred */
	279	(*info->fprintf_func) (info->stream, "@");
	280	case 14: /* Long displacement */
	281	if (regnum == PC_REGNUM)
	282	{
c5aa993b	283	info->target = addr + (short ) p + 5;
c906108c SS	284	(*info->print_address_func) (info->target, info);
	285	}
	286	else
	287	(*info->fprintf_func) (info->stream, "%d(%s)",
c5aa993b	288	(long ) p, REGISTER_NAME (regnum));
c906108c SS	289	p += 4;
	290	}
	291
	292	return (unsigned char *) p;
	293	}
	294
	295	void
fba45db2	296	_initialize_vax_tdep (void)
c906108c SS	297	{
	298	tm_print_insn = vax_print_insn;
	299	}