[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 (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
	4	This file is part of GDB.
	5
	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.
	10
	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.
	15
	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, Boston, MA 02111-1307, USA. */
	19
	20	#include "defs.h"
	21	#include "symtab.h"
	22	#include "opcode/vax.h"
	23
	24	/* Vax instructions are never longer than this. */
	25	#define MAXLEN 62
	26
	27	/* Number of elements in the opcode table. */
	28	#define NOPCODES (sizeof votstrs / sizeof votstrs[0])
	29
	30	static unsigned char *print_insn_arg ();
	31	\f
b83266a0 SS	32	/* Advance PC across any function entry prologue instructions
	33	to reach some "real" code. */
	34
	35	CORE_ADDR
	36	vax_skip_prologue (pc)
	37	CORE_ADDR pc;
	38	{
	39	register int op = (unsigned char) read_memory_integer (pc, 1);
	40	if (op == 0x11)
	41	pc += 2; /* skip brb */
	42	if (op == 0x31)
	43	pc += 3; /* skip brw */
	44	if (op == 0xC2
	45	&& ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5E)
	46	pc += 3; /* skip subl2 */
	47	if (op == 0x9E
	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 */
	51	if (op == 0x9E
	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 */
	55	if (op == 0x9E
	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 */
	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
	66	vax_frame_num_args (fi)
	67	struct frame_info *fi;
	68	{
	69	return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1));
	70	}
	71
	72
	73
c906108c SS	74	/* Print the vax instruction at address MEMADDR in debugged memory,
	75	from disassembler info INFO.
	76	Returns length of the instruction, in bytes. */
	77
	78	static int
	79	vax_print_insn (memaddr, info)
	80	CORE_ADDR memaddr;
	81	disassemble_info *info;
	82	{
	83	unsigned char buffer[MAXLEN];
	84	register int i;
	85	register unsigned char *p;
	86	register char *d;
	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]
	97	\|\| votstrs[i].detail.code == (unsigned short )buffer)
	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 *
	128	print_insn_arg (d, p, addr, info)
	129	char *d;
	130	register char *p;
	131	CORE_ADDR addr;
	132	disassemble_info *info;
	133	{
	134	register int regnum = *p & 0xf;
	135	float floatlitbuf;
	136
	137	if (*d == 'b')
138	{
139	if (d[1] == 'b')
140	(info->fprintf_func) (info->stream, "0x%x", addr + p++ + 1);
141	else
142	{
143	(info->fprintf_func) (info->stream, "0x%x", addr + (short *)p + 2);
144	p += 2;
145	}
146	}
147	else
148	switch ((*p++ >> 4) & 0xf)
149	{
150	case 0:
151	case 1:
152	case 2:
153	case 3: /* Literal mode */
154	if (d[1] == 'd' \|\| d[1] == 'f' \|\| d[1] == 'g' \|\| d[1] == 'h')
155	{
156	(int )&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
157	(*info->fprintf_func) (info->stream, "$%f", floatlitbuf);
158	}
159	else
160	(*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f);
161	break;
162
163	case 4: /* Indexed */
164	p = (char *) print_insn_arg (d, p, addr + 1, info);
165	(*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum));
166	break;
167
168	case 5: /* Register */
169	(*info->fprintf_func) (info->stream, REGISTER_NAME (regnum));
170	break;
171
172	case 7: /* Autodecrement */
173	(*info->fprintf_func) (info->stream, "-");
174	case 6: /* Register deferred */
175	(*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum));
176	break;
177
178	case 9: /* Autoincrement deferred */
179	(*info->fprintf_func) (info->stream, "@");
180	if (regnum == PC_REGNUM)
181	{
182	(*info->fprintf_func) (info->stream, "#");
183	info->target = (long )p;
184	(*info->print_address_func) (info->target, info);
185	p += 4;
186	break;
187	}
188	case 8: /* Autoincrement */
189	if (regnum == PC_REGNUM)
190	{
191	(*info->fprintf_func) (info->stream, "#");
192	switch (d[1])
193	{
194	case 'b':
195	(info->fprintf_func) (info->stream, "%d", p++);
196	break;
197
198	case 'w':
199	(info->fprintf_func) (info->stream, "%d", (short *)p);
200	p += 2;
201	break;
202
203	case 'l':
204	(info->fprintf_func) (info->stream, "%d", (long *)p);
205	p += 4;
206	break;
207
208	case 'q':
209	(*info->fprintf_func) (info->stream, "0x%x%08x",
210	((long )p)[1], ((long )p)[0]);
211	p += 8;
212	break;
213
214	case 'o':
215	(*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x",
216	((long )p)[3], ((long )p)[2],
217	((long )p)[1], ((long )p)[0]);
218	p += 16;
219	break;
220
221	case 'f':
222	if (INVALID_FLOAT (p, 4))
223	(*info->fprintf_func) (info->stream,
224	"<<invalid float 0x%x>>",
225	(int ) p);
226	else
227	(info->fprintf_func) (info->stream, "%f", (float *) p);
228	p += 4;
229	break;
230
231	case 'd':
232	if (INVALID_FLOAT (p, 8))
233	(*info->fprintf_func) (info->stream,
234	"<<invalid float 0x%x%08x>>",
235	((long )p)[1], ((long )p)[0]);
236	else
237	(info->fprintf_func) (info->stream, "%f", (double *) p);
238	p += 8;
239	break;
240
241	case 'g':
242	(*info->fprintf_func) (info->stream, "g-float");
243	p += 8;
244	break;
245
246	case 'h':
247	(*info->fprintf_func) (info->stream, "h-float");
248	p += 16;
249	break;
250
251	}
252	}
253	else
254	(*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum));
255	break;
256
257	case 11: /* Byte displacement deferred */
258	(*info->fprintf_func) (info->stream, "@");
259	case 10: /* Byte displacement */
260	if (regnum == PC_REGNUM)
261	{
262	info->target = addr + *p + 2;
263	(*info->print_address_func) (info->target, info);
264	}
265	else
266	(info->fprintf_func) (info->stream, "%d(%s)", p, REGISTER_NAME (regnum));
267	p += 1;
268	break;
269
270	case 13: /* Word displacement deferred */
271	(*info->fprintf_func) (info->stream, "@");
272	case 12: /* Word displacement */
273	if (regnum == PC_REGNUM)
274	{
275	info->target = addr + (short )p + 3;
276	(*info->print_address_func) (info->target, info);
277	}
278	else
279	(*info->fprintf_func) (info->stream, "%d(%s)",
280	(short )p, REGISTER_NAME (regnum));
281	p += 2;
282	break;
283
284	case 15: /* Long displacement deferred */
285	(*info->fprintf_func) (info->stream, "@");
286	case 14: /* Long displacement */
287	if (regnum == PC_REGNUM)
288	{
289	info->target = addr + (short )p + 5;
290	(*info->print_address_func) (info->target, info);
291	}
292	else
293	(*info->fprintf_func) (info->stream, "%d(%s)",
294	(long )p, REGISTER_NAME (regnum));
295	p += 4;
296	}
297
298	return (unsigned char *) p;
299	}
300
301	void
302	_initialize_vax_tdep ()
303	{
304	tm_print_insn = vax_print_insn;
305	}