[binutils.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"
#include "gdbcore.h"
#include "frame.h"
#include "value.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;
  const 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"
c11c3a98 AC	24	#include "gdbcore.h"
	25	#include "frame.h"
	26	#include "value.h"
c906108c SS	27
	28	/* Vax instructions are never longer than this. */
	29	#define MAXLEN 62
	30
	31	/* Number of elements in the opcode table. */
	32	#define NOPCODES (sizeof votstrs / sizeof votstrs[0])
	33
	34	static unsigned char *print_insn_arg ();
	35	\f
b83266a0 SS	36	/* Advance PC across any function entry prologue instructions
	37	to reach some "real" code. */
	38
	39	CORE_ADDR
fba45db2	40	vax_skip_prologue (CORE_ADDR pc)
b83266a0 SS	41	{
	42	register int op = (unsigned char) read_memory_integer (pc, 1);
	43	if (op == 0x11)
c5aa993b	44	pc += 2; /* skip brb */
b83266a0	45	if (op == 0x31)
c5aa993b	46	pc += 3; /* skip brw */
b83266a0	47	if (op == 0xC2
c5aa993b JM	48	&& ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E)
c5aa993b JM	49	pc += 3; /* skip subl2 */
b83266a0	50	if (op == 0x9E
c5aa993b JM	51	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE
	52	&& ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E)
	53	pc += 4; /* skip movab */
b83266a0	54	if (op == 0x9E
c5aa993b JM	55	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE
	56	&& ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E)
	57	pc += 5; /* skip movab */
b83266a0	58	if (op == 0x9E
c5aa993b JM	59	&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE
	60	&& ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E)
	61	pc += 7; /* skip movab */
b83266a0 SS	62	return pc;
	63	}
	64
392a587b JM	65	/* Return number of args passed to a frame.
	66	Can return -1, meaning no way to tell. */
	67
	68	int
fba45db2	69	vax_frame_num_args (struct frame_info *fi)
392a587b JM	70	{
	71	return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1));
	72	}
	73
	74
	75
c906108c SS	76	/* Print the vax instruction at address MEMADDR in debugged memory,
	77	from disassembler info INFO.
	78	Returns length of the instruction, in bytes. */
	79
	80	static int
fba45db2	81	vax_print_insn (CORE_ADDR memaddr, disassemble_info *info)
c906108c SS	82	{
	83	unsigned char buffer[MAXLEN];
	84	register int i;
	85	register unsigned char *p;
c11c3a98	86	const char *d;
c906108c SS	87
	88	int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info);
	89	if (status != 0)
	90	{
	91	(*info->memory_error_func) (status, memaddr, info);
	92	return -1;
	93	}
	94
	95	for (i = 0; i < NOPCODES; i++)
	96	if (votstrs[i].detail.code == buffer[0]
c5aa993b	97	\|\| votstrs[i].detail.code == (unsigned short ) buffer)
c906108c SS	98	break;
	99
	100	/* Handle undefined instructions. */
	101	if (i == NOPCODES)
	102	{
	103	(*info->fprintf_func) (info->stream, "0%o", buffer[0]);
	104	return 1;
	105	}
	106
	107	(*info->fprintf_func) (info->stream, "%s", votstrs[i].name);
	108
	109	/* Point at first byte of argument data,
	110	and at descriptor for first argument. */
	111	p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
	112	d = votstrs[i].detail.args;
	113
	114	if (*d)
	115	(*info->fprintf_func) (info->stream, " ");
	116
	117	while (*d)
	118	{
	119	p = print_insn_arg (d, p, memaddr + (p - buffer), info);
	120	d += 2;
	121	if (*d)
	122	(*info->fprintf_func) (info->stream, ",");
	123	}
	124	return p - buffer;
	125	}
	126
	127	static unsigned char *
fba45db2 KB	128	print_insn_arg (char d, register char p, CORE_ADDR addr,
fba45db2 KB	129	disassemble_info *info)
c906108c SS	130	{
	131	register int regnum = *p & 0xf;
	132	float floatlitbuf;
	133
	134	if (*d == 'b')
	135	{
	136	if (d[1] == 'b')
	137	(info->fprintf_func) (info->stream, "0x%x", addr + p++ + 1);
	138	else
	139	{
c5aa993b	140	(info->fprintf_func) (info->stream, "0x%x", addr + (short *) p + 2);
c906108c SS	141	p += 2;
	142	}
	143	}
	144	else
	145	switch ((*p++ >> 4) & 0xf)
	146	{
	147	case 0:
	148	case 1:
	149	case 2:
	150	case 3: /* Literal mode */
	151	if (d[1] == 'd' \|\| d[1] == 'f' \|\| d[1] == 'g' \|\| d[1] == 'h')
	152	{
c5aa993b	153	(int ) &floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
c906108c SS	154	(*info->fprintf_func) (info->stream, "$%f", floatlitbuf);
	155	}
	156	else
	157	(*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f);
	158	break;
	159
	160	case 4: /* Indexed */
	161	p = (char *) print_insn_arg (d, p, addr + 1, info);
	162	(*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum));
	163	break;
	164
	165	case 5: /* Register */
	166	(*info->fprintf_func) (info->stream, REGISTER_NAME (regnum));
	167	break;
	168
	169	case 7: /* Autodecrement */
	170	(*info->fprintf_func) (info->stream, "-");
	171	case 6: /* Register deferred */
	172	(*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum));
	173	break;
	174
	175	case 9: /* Autoincrement deferred */
	176	(*info->fprintf_func) (info->stream, "@");
	177	if (regnum == PC_REGNUM)
	178	{
	179	(*info->fprintf_func) (info->stream, "#");
c5aa993b	180	info->target = (long ) p;
c906108c SS	181	(*info->print_address_func) (info->target, info);
	182	p += 4;
	183	break;
	184	}
	185	case 8: /* Autoincrement */
	186	if (regnum == PC_REGNUM)
	187	{
	188	(*info->fprintf_func) (info->stream, "#");
	189	switch (d[1])
	190	{
	191	case 'b':
	192	(info->fprintf_func) (info->stream, "%d", p++);
	193	break;
	194
	195	case 'w':
c5aa993b	196	(info->fprintf_func) (info->stream, "%d", (short *) p);
c906108c SS	197	p += 2;
	198	break;
	199
	200	case 'l':
c5aa993b	201	(info->fprintf_func) (info->stream, "%d", (long *) p);
c906108c SS	202	p += 4;
	203	break;
	204
	205	case 'q':
	206	(*info->fprintf_func) (info->stream, "0x%x%08x",
c5aa993b	207	((long ) p)[1], ((long ) p)[0]);
c906108c SS	208	p += 8;
	209	break;
	210
	211	case 'o':
	212	(*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x",
c5aa993b JM	213	((long ) p)[3], ((long ) p)[2],
c5aa993b JM	214	((long ) p)[1], ((long ) p)[0]);
c906108c SS	215	p += 16;
	216	break;
	217
	218	case 'f':
	219	if (INVALID_FLOAT (p, 4))
	220	(*info->fprintf_func) (info->stream,
	221	"<<invalid float 0x%x>>",
	222	(int ) p);
	223	else
	224	(info->fprintf_func) (info->stream, "%f", (float *) p);
	225	p += 4;
	226	break;
	227
	228	case 'd':
	229	if (INVALID_FLOAT (p, 8))
	230	(*info->fprintf_func) (info->stream,
	231	"<<invalid float 0x%x%08x>>",
c5aa993b	232	((long ) p)[1], ((long ) p)[0]);
c906108c SS	233	else
	234	(info->fprintf_func) (info->stream, "%f", (double *) p);
	235	p += 8;
	236	break;
	237
	238	case 'g':
	239	(*info->fprintf_func) (info->stream, "g-float");
	240	p += 8;
	241	break;
	242
	243	case 'h':
	244	(*info->fprintf_func) (info->stream, "h-float");
	245	p += 16;
	246	break;
	247
	248	}
	249	}
	250	else
	251	(*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum));
	252	break;
	253
	254	case 11: /* Byte displacement deferred */
	255	(*info->fprintf_func) (info->stream, "@");
	256	case 10: /* Byte displacement */
	257	if (regnum == PC_REGNUM)
	258	{
	259	info->target = addr + *p + 2;
	260	(*info->print_address_func) (info->target, info);
	261	}
	262	else
	263	(info->fprintf_func) (info->stream, "%d(%s)", p, REGISTER_NAME (regnum));
	264	p += 1;
	265	break;
	266
	267	case 13: /* Word displacement deferred */
	268	(*info->fprintf_func) (info->stream, "@");
	269	case 12: /* Word displacement */
	270	if (regnum == PC_REGNUM)
	271	{
c5aa993b	272	info->target = addr + (short ) p + 3;
c906108c SS	273	(*info->print_address_func) (info->target, info);
	274	}
	275	else
	276	(*info->fprintf_func) (info->stream, "%d(%s)",
c5aa993b	277	(short ) p, REGISTER_NAME (regnum));
c906108c SS	278	p += 2;
	279	break;
	280
	281	case 15: /* Long displacement deferred */
	282	(*info->fprintf_func) (info->stream, "@");
	283	case 14: /* Long displacement */
	284	if (regnum == PC_REGNUM)
	285	{
c5aa993b	286	info->target = addr + (short ) p + 5;
c906108c SS	287	(*info->print_address_func) (info->target, info);
	288	}
	289	else
	290	(*info->fprintf_func) (info->stream, "%d(%s)",
c5aa993b	291	(long ) p, REGISTER_NAME (regnum));
c906108c SS	292	p += 4;
	293	}
	294
	295	return (unsigned char *) p;
	296	}
	297
	298	void
fba45db2	299	_initialize_vax_tdep (void)
c906108c SS	300	{
	301	tm_print_insn = vax_print_insn;
	302	}