[thirdparty/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 (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;
}
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
	37	vax_skip_prologue (pc)
	38	CORE_ADDR pc;
	39	{
	40	register int op = (unsigned char) read_memory_integer (pc, 1);
	41	if (op == 0x11)
c5aa993b	42	pc += 2; /* skip brb */
b83266a0	43	if (op == 0x31)
c5aa993b	44	pc += 3; /* skip brw */
b83266a0	45	if (op == 0xC2
c5aa993b JM	46	&& ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E)
c5aa993b JM	47	pc += 3; /* skip subl2 */
b83266a0	48	if (op == 0x9E
c5aa993b JM	49	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE
	50	&& ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E)
	51	pc += 4; /* skip movab */
b83266a0	52	if (op == 0x9E
c5aa993b JM	53	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE
	54	&& ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E)
	55	pc += 5; /* skip movab */
b83266a0	56	if (op == 0x9E
c5aa993b JM	57	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE
	58	&& ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E)
	59	pc += 7; /* skip movab */
b83266a0 SS	60	return pc;
	61	}
	62
392a587b JM	63	/* Return number of args passed to a frame.
	64	Can return -1, meaning no way to tell. */
	65
	66	int
	67	vax_frame_num_args (fi)
	68	struct frame_info *fi;
	69	{
	70	return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1));
	71	}
	72
	73
	74
c906108c SS	75	/* Print the vax instruction at address MEMADDR in debugged memory,
	76	from disassembler info INFO.
	77	Returns length of the instruction, in bytes. */
	78
	79	static int
	80	vax_print_insn (memaddr, info)
	81	CORE_ADDR memaddr;
	82	disassemble_info *info;
	83	{
	84	unsigned char buffer[MAXLEN];
	85	register int i;
	86	register unsigned char *p;
	87	register char *d;
	88
	89	int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info);
	90	if (status != 0)
	91	{
	92	(*info->memory_error_func) (status, memaddr, info);
	93	return -1;
	94	}
	95
	96	for (i = 0; i < NOPCODES; i++)
	97	if (votstrs[i].detail.code == buffer[0]
c5aa993b	98	\|\| votstrs[i].detail.code == (unsigned short ) buffer)
c906108c SS	99	break;
	100
	101	/* Handle undefined instructions. */
	102	if (i == NOPCODES)
	103	{
	104	(*info->fprintf_func) (info->stream, "0%o", buffer[0]);
	105	return 1;
	106	}
	107
	108	(*info->fprintf_func) (info->stream, "%s", votstrs[i].name);
	109
	110	/* Point at first byte of argument data,
	111	and at descriptor for first argument. */
	112	p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
	113	d = votstrs[i].detail.args;
	114
	115	if (*d)
	116	(*info->fprintf_func) (info->stream, " ");
	117
	118	while (*d)
	119	{
	120	p = print_insn_arg (d, p, memaddr + (p - buffer), info);
	121	d += 2;
	122	if (*d)
	123	(*info->fprintf_func) (info->stream, ",");
	124	}
	125	return p - buffer;
	126	}
	127
	128	static unsigned char *
	129	print_insn_arg (d, p, addr, info)
	130	char *d;
	131	register char *p;
	132	CORE_ADDR addr;
	133	disassemble_info *info;
	134	{
	135	register int regnum = *p & 0xf;
	136	float floatlitbuf;
	137
	138	if (*d == 'b')
	139	{
	140	if (d[1] == 'b')
	141	(info->fprintf_func) (info->stream, "0x%x", addr + p++ + 1);
	142	else
	143	{
c5aa993b	144	(info->fprintf_func) (info->stream, "0x%x", addr + (short *) p + 2);
c906108c SS	145	p += 2;
	146	}
	147	}
	148	else
	149	switch ((*p++ >> 4) & 0xf)
	150	{
	151	case 0:
	152	case 1:
	153	case 2:
	154	case 3: /* Literal mode */
	155	if (d[1] == 'd' \|\| d[1] == 'f' \|\| d[1] == 'g' \|\| d[1] == 'h')
	156	{
c5aa993b	157	(int ) &floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
c906108c SS	158	(*info->fprintf_func) (info->stream, "$%f", floatlitbuf);
	159	}
	160	else
	161	(*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f);
	162	break;
	163
	164	case 4: /* Indexed */
	165	p = (char *) print_insn_arg (d, p, addr + 1, info);
	166	(*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum));
	167	break;
	168
	169	case 5: /* Register */
	170	(*info->fprintf_func) (info->stream, REGISTER_NAME (regnum));
	171	break;
	172
	173	case 7: /* Autodecrement */
	174	(*info->fprintf_func) (info->stream, "-");
	175	case 6: /* Register deferred */
	176	(*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum));
	177	break;
	178
	179	case 9: /* Autoincrement deferred */
	180	(*info->fprintf_func) (info->stream, "@");
	181	if (regnum == PC_REGNUM)
	182	{
	183	(*info->fprintf_func) (info->stream, "#");
c5aa993b	184	info->target = (long ) p;
c906108c SS	185	(*info->print_address_func) (info->target, info);
	186	p += 4;
	187	break;
	188	}
	189	case 8: /* Autoincrement */
	190	if (regnum == PC_REGNUM)
	191	{
	192	(*info->fprintf_func) (info->stream, "#");
	193	switch (d[1])
	194	{
	195	case 'b':
	196	(info->fprintf_func) (info->stream, "%d", p++);
	197	break;
	198
	199	case 'w':
c5aa993b	200	(info->fprintf_func) (info->stream, "%d", (short *) p);
c906108c SS	201	p += 2;
	202	break;
	203
	204	case 'l':
c5aa993b	205	(info->fprintf_func) (info->stream, "%d", (long *) p);
c906108c SS	206	p += 4;
	207	break;
	208
	209	case 'q':
	210	(*info->fprintf_func) (info->stream, "0x%x%08x",
c5aa993b	211	((long ) p)[1], ((long ) p)[0]);
c906108c SS	212	p += 8;
	213	break;
	214
	215	case 'o':
	216	(*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x",
c5aa993b JM	217	((long ) p)[3], ((long ) p)[2],
c5aa993b JM	218	((long ) p)[1], ((long ) p)[0]);
c906108c SS	219	p += 16;
	220	break;
	221
	222	case 'f':
	223	if (INVALID_FLOAT (p, 4))
	224	(*info->fprintf_func) (info->stream,
	225	"<<invalid float 0x%x>>",
	226	(int ) p);
	227	else
	228	(info->fprintf_func) (info->stream, "%f", (float *) p);
	229	p += 4;
	230	break;
	231
	232	case 'd':
	233	if (INVALID_FLOAT (p, 8))
	234	(*info->fprintf_func) (info->stream,
	235	"<<invalid float 0x%x%08x>>",
c5aa993b	236	((long ) p)[1], ((long ) p)[0]);
c906108c SS	237	else
	238	(info->fprintf_func) (info->stream, "%f", (double *) p);
	239	p += 8;
	240	break;
	241
	242	case 'g':
	243	(*info->fprintf_func) (info->stream, "g-float");
	244	p += 8;
	245	break;
	246
	247	case 'h':
	248	(*info->fprintf_func) (info->stream, "h-float");
	249	p += 16;
	250	break;
	251
	252	}
	253	}
	254	else
	255	(*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum));
	256	break;
	257
	258	case 11: /* Byte displacement deferred */
	259	(*info->fprintf_func) (info->stream, "@");
	260	case 10: /* Byte displacement */
	261	if (regnum == PC_REGNUM)
	262	{
	263	info->target = addr + *p + 2;
	264	(*info->print_address_func) (info->target, info);
	265	}
	266	else
	267	(info->fprintf_func) (info->stream, "%d(%s)", p, REGISTER_NAME (regnum));
	268	p += 1;
	269	break;
	270
	271	case 13: /* Word displacement deferred */
	272	(*info->fprintf_func) (info->stream, "@");
	273	case 12: /* Word displacement */
	274	if (regnum == PC_REGNUM)
	275	{
c5aa993b	276	info->target = addr + (short ) p + 3;
c906108c SS	277	(*info->print_address_func) (info->target, info);
	278	}
	279	else
	280	(*info->fprintf_func) (info->stream, "%d(%s)",
c5aa993b	281	(short ) p, REGISTER_NAME (regnum));
c906108c SS	282	p += 2;
	283	break;
	284
	285	case 15: /* Long displacement deferred */
	286	(*info->fprintf_func) (info->stream, "@");
	287	case 14: /* Long displacement */
	288	if (regnum == PC_REGNUM)
	289	{
c5aa993b	290	info->target = addr + (short ) p + 5;
c906108c SS	291	(*info->print_address_func) (info->target, info);
	292	}
	293	else
	294	(*info->fprintf_func) (info->stream, "%d(%s)",
c5aa993b	295	(long ) p, REGISTER_NAME (regnum));
c906108c SS	296	p += 4;
	297	}
	298
	299	return (unsigned char *) p;
	300	}
	301
	302	void
	303	_initialize_vax_tdep ()
	304	{
	305	tm_print_insn = vax_print_insn;
	306	}