[deliverable/binutils-gdb.git] / opcodes / vax-dis.c

/* Print VAX instructions.
   Copyright (C) 1995, 1998 Free Software Foundation, Inc.
   Contributed by Pauline Middelink <middelin@polyware.iaf.nl>

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 "opcode/vax.h"
#include "dis-asm.h"

/* Local function prototypes */
static int
print_insn_arg PARAMS ((const char *, unsigned char *, bfd_vma,
			disassemble_info *));

static int
print_insn_mode PARAMS ((int, unsigned char *, bfd_vma, disassemble_info *));

static char *reg_names[] =
{
  "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc"
};

/* Sign-extend an (unsigned char). */
#if __STDC__ == 1
#define COERCE_SIGNED_CHAR(ch) ((signed char)(ch))
#else
#define COERCE_SIGNED_CHAR(ch) ((int)(((ch) ^ 0x80) & 0xFF) - 128)
#endif

/* Get a 1 byte signed integer.  */
#define NEXTBYTE(p)  \
  (p += 1, FETCH_DATA (info, p), \
  COERCE_SIGNED_CHAR(p[-1]))

/* Get a 2 byte signed integer.  */
#define COERCE16(x) ((int) (((x) ^ 0x8000) - 0x8000))
#define NEXTWORD(p)  \
  (p += 2, FETCH_DATA (info, p), \
   COERCE16 ((p[-1] << 8) + p[-2]))

/* Get a 4 byte signed integer.  */
#define COERCE32(x) ((int) (((x) ^ 0x80000000) - 0x80000000))
#define NEXTLONG(p)  \
  (p += 4, FETCH_DATA (info, p), \
   (COERCE32 ((((((p[-1] << 8) + p[-2]) << 8) + p[-3]) << 8) + p[-4])))

/* Maximum length of an instruction.  */
#define MAXLEN 25

#include <setjmp.h>

struct private
{
  /* Points to first byte not fetched.  */
  bfd_byte *max_fetched;
  bfd_byte the_buffer[MAXLEN];
  bfd_vma insn_start;
  jmp_buf bailout;
};

/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
   to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
   on error.  */
#define FETCH_DATA(info, addr) \
  ((addr) <= ((struct private *)(info->private_data))->max_fetched \
   ? 1 : fetch_data ((info), (addr)))

static int
fetch_data (info, addr)
     struct disassemble_info *info;
     bfd_byte *addr;
{
  int status;
  struct private *priv = (struct private *) info->private_data;
  bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer);

  status = (*info->read_memory_func) (start,
				      priv->max_fetched,
				      addr - priv->max_fetched,
				      info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, start, info);
      longjmp (priv->bailout, 1);
    }
  else
    priv->max_fetched = addr;

  return 1;
}

/* Print the vax instruction at address MEMADDR in debugged memory,
   on INFO->STREAM.  Returns length of the instruction, in bytes.  */

int
print_insn_vax (memaddr, info)
     bfd_vma memaddr;
     disassemble_info *info;
{
  const struct vot *votp;
  const char *argp = NULL;
  unsigned char *arg;
  struct private priv;
  bfd_byte *buffer = priv.the_buffer;

  info->private_data = (PTR) &priv;
  priv.max_fetched = priv.the_buffer;
  priv.insn_start = memaddr;
  if (setjmp (priv.bailout) != 0)
    {
      /* Error return.  */
      return -1;
    }

  FETCH_DATA (info, buffer + 2);
  for (votp = &votstrs[0]; votp->name[0]; votp++)
    {
      register vax_opcodeT opcode = votp->detail.code;

      /* 2 byte codes match 2 buffer pos. */
      if ((bfd_byte) opcode == buffer[0]
	  && (opcode >> 8 == 0 || opcode >> 8 == buffer[1]))
	{
	  argp = votp->detail.args;
	  break;
	}
    }
  if (argp == NULL)
    {
      /* Handle undefined instructions. */
      (*info->fprintf_func) (info->stream, ".word 0x%x",
			     (buffer[0] << 8) + buffer[1]);
      return 2;
    }

  /* Point at first byte of argument data, and at descriptor for first
     argument.  */
  arg = buffer + ((votp->detail.code >> 8) ? 2 : 1);

  /* Make sure we have it in mem */
  FETCH_DATA (info, arg);

  (*info->fprintf_func) (info->stream, "%s", votp->name);
  if (*argp)
    (*info->fprintf_func) (info->stream, " ");

  while (*argp)
    {
      arg += print_insn_arg (argp, arg, memaddr + arg - buffer, info);
      argp += 2;
      if (*argp)
	(*info->fprintf_func) (info->stream, ",");
    }

  return arg - buffer;
}

/* Returns number of bytes "eaten" by the operand, or return -1 if an
   invalid operand was found, or -2 if an opcode tabel error was
   found. */

static int
print_insn_arg (d, p0, addr, info)
     const char *d;
     unsigned char *p0;
     bfd_vma addr;		/* PC for this arg to be relative to */
     disassemble_info *info;
{
  int arg_len;

  /* check validity of addressing length */
  switch (d[1])
    {
    case 'b' : arg_len = 1;	break;
    case 'd' : arg_len = 8;	break;
    case 'f' : arg_len = 4;	break;
    case 'g' : arg_len = 8;	break;
    case 'h' : arg_len = 16;	break;
    case 'l' : arg_len = 4;	break;
    case 'o' : arg_len = 16;	break;
    case 'w' : arg_len = 2;	break;
    case 'q' : arg_len = 8;	break;
    default  : abort();
    }

  /* branches have no mode byte */
  if (d[0] == 'b')
    {
      unsigned char *p = p0;

      if (arg_len == 1)
	(*info->print_address_func) (addr + 1 + NEXTBYTE (p), info);
      else
	(*info->print_address_func) (addr + 2 + NEXTWORD (p), info);

      return p - p0;
    }

  return print_insn_mode (arg_len, p0, addr, info);
}

static int
print_insn_mode (size, p0, addr, info)
     int size;
     unsigned char *p0;
     bfd_vma addr;		/* PC for this arg to be relative to */
     disassemble_info *info;
{
  unsigned char *p = p0;
  unsigned char mode, reg;

  /* fetch and interpret mode byte */
  mode = (unsigned char) NEXTBYTE (p);
  reg = mode & 0xF;
  switch (mode & 0xF0)
    {
    case 0x00:
    case 0x10:
    case 0x20:
    case 0x30: /* literal mode			$number */
      (*info->fprintf_func) (info->stream, "$0x%x", mode);
      break;
    case 0x40: /* index:			base-addr[Rn] */
      p += print_insn_mode (size, p0 + 1, addr + 1, info);
      (*info->fprintf_func) (info->stream, "[%s]", reg_names[reg]);
      break;
    case 0x50: /* register:			Rn */
      (*info->fprintf_func) (info->stream, "%s", reg_names[reg]);
      break;
    case 0x60: /* register deferred:		(Rn) */
      (*info->fprintf_func) (info->stream, "(%s)", reg_names[reg]);
      break;
    case 0x70: /* autodecrement:		-(Rn) */
      (*info->fprintf_func) (info->stream, "-(%s)", reg_names[reg]);
      break;
    case 0x80: /* autoincrement:		(Rn)+ */
      if (reg == 0xF)
	{	/* immediate? */
	  int i;

	  FETCH_DATA (info, p + size);
	  (*info->fprintf_func) (info->stream, "$0x");
	  for (i = 0; i < size; i++)
	    (*info->fprintf_func) (info->stream, "%02x", p[size - i - 1]);
	  p += size;
	}
      else
	(*info->fprintf_func) (info->stream, "(%s)+", reg_names[reg]);
      break;
    case 0x90: /* autoincrement deferred:	@(Rn)+ */
      if (reg == 0xF)
	(*info->fprintf_func) (info->stream, "*0x%x", NEXTLONG (p));
      else
	(*info->fprintf_func) (info->stream, "@(%s)+", reg_names[reg]);
      break;
    case 0xB0: /* displacement byte deferred:	*displ(Rn) */
      (*info->fprintf_func) (info->stream, "*");
    case 0xA0: /* displacement byte:		displ(Rn) */
      if (reg == 0xF)
	(*info->print_address_func) (addr + 2 + NEXTBYTE (p), info);
      else
	(*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTBYTE (p),
			       reg_names[reg]);
      break;
    case 0xD0: /* displacement word deferred:	*displ(Rn) */
      (*info->fprintf_func) (info->stream, "*");
    case 0xC0: /* displacement word:		displ(Rn) */
      if (reg == 0xF)
	(*info->print_address_func) (addr + 3 + NEXTWORD (p), info);
      else
	(*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTWORD (p),
			       reg_names[reg]);
      break;
    case 0xF0: /* displacement long deferred:	*displ(Rn) */
      (*info->fprintf_func) (info->stream, "*");
    case 0xE0: /* displacement long:		displ(Rn) */
      if (reg == 0xF)
	(*info->print_address_func) (addr + 5 + NEXTLONG (p), info);
      else
	(*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTLONG (p),
			       reg_names[reg]);
      break;
    }

  return p - p0;
}
Commit	Line	Data
252b5132 RH	1	/* Print VAX instructions.
	2	Copyright (C) 1995, 1998 Free Software Foundation, Inc.
	3	Contributed by Pauline Middelink <middelin@polyware.iaf.nl>
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 2 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	GNU General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program; if not, write to the Free Software
	17	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	18
	19	#include "opcode/vax.h"
	20	#include "dis-asm.h"
	21
	22	/* Local function prototypes */
	23	static int
	24	print_insn_arg PARAMS ((const char , unsigned char , bfd_vma,
	25	disassemble_info *));
	26
	27	static int
	28	print_insn_mode PARAMS ((int, unsigned char , bfd_vma, disassemble_info ));
	29
	30	static char *reg_names[] =
	31	{
	32	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
	33	"r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc"
	34	};
	35
	36	/* Sign-extend an (unsigned char). */
	37	#if __STDC__ == 1
	38	#define COERCE_SIGNED_CHAR(ch) ((signed char)(ch))
	39	#else
	40	#define COERCE_SIGNED_CHAR(ch) ((int)(((ch) ^ 0x80) & 0xFF) - 128)
	41	#endif
	42
	43	/* Get a 1 byte signed integer. */
	44	#define NEXTBYTE(p) \
	45	(p += 1, FETCH_DATA (info, p), \
	46	COERCE_SIGNED_CHAR(p[-1]))
	47
	48	/* Get a 2 byte signed integer. */
	49	#define COERCE16(x) ((int) (((x) ^ 0x8000) - 0x8000))
	50	#define NEXTWORD(p) \
	51	(p += 2, FETCH_DATA (info, p), \
	52	COERCE16 ((p[-1] << 8) + p[-2]))
	53
	54	/* Get a 4 byte signed integer. */
	55	#define COERCE32(x) ((int) (((x) ^ 0x80000000) - 0x80000000))
	56	#define NEXTLONG(p) \
	57	(p += 4, FETCH_DATA (info, p), \
	58	(COERCE32 ((((((p[-1] << 8) + p[-2]) << 8) + p[-3]) << 8) + p[-4])))
	59
	60	/* Maximum length of an instruction. */
	61	#define MAXLEN 25
	62
	63	#include <setjmp.h>
	64
65	struct private
66	{
67	/* Points to first byte not fetched. */
68	bfd_byte *max_fetched;
69	bfd_byte the_buffer[MAXLEN];
70	bfd_vma insn_start;
71	jmp_buf bailout;
72	};
73
74	/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
75	to ADDR (exclusive) are valid. Returns 1 for success, longjmps
76	on error. */
77	#define FETCH_DATA(info, addr) \
78	((addr) <= ((struct private *)(info->private_data))->max_fetched \
79	? 1 : fetch_data ((info), (addr)))
80
81	static int
82	fetch_data (info, addr)
83	struct disassemble_info *info;
84	bfd_byte *addr;
85	{
86	int status;
87	struct private priv = (struct private ) info->private_data;
88	bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer);
89
90	status = (*info->read_memory_func) (start,
91	priv->max_fetched,
92	addr - priv->max_fetched,
93	info);
94	if (status != 0)
95	{
96	(*info->memory_error_func) (status, start, info);
97	longjmp (priv->bailout, 1);
98	}
99	else
100	priv->max_fetched = addr;
101
102	return 1;
103	}
104
105	/* Print the vax instruction at address MEMADDR in debugged memory,
106	on INFO->STREAM. Returns length of the instruction, in bytes. */
107
108	int
109	print_insn_vax (memaddr, info)
110	bfd_vma memaddr;
111	disassemble_info *info;
112	{
113	const struct vot *votp;
114	const char *argp = NULL;
115	unsigned char *arg;
116	struct private priv;
117	bfd_byte *buffer = priv.the_buffer;
118
119	info->private_data = (PTR) &priv;
120	priv.max_fetched = priv.the_buffer;
121	priv.insn_start = memaddr;
122	if (setjmp (priv.bailout) != 0)
123	{
124	/* Error return. */
125	return -1;
126	}
127
128	FETCH_DATA (info, buffer + 2);
129	for (votp = &votstrs[0]; votp->name[0]; votp++)
130	{
131	register vax_opcodeT opcode = votp->detail.code;
132
133	/* 2 byte codes match 2 buffer pos. */
134	if ((bfd_byte) opcode == buffer[0]
135	&& (opcode >> 8 == 0 \|\| opcode >> 8 == buffer[1]))
136	{
137	argp = votp->detail.args;
138	break;
139	}
140	}
141	if (argp == NULL)
142	{
143	/* Handle undefined instructions. */
144	(*info->fprintf_func) (info->stream, ".word 0x%x",
145	(buffer[0] << 8) + buffer[1]);
146	return 2;
147	}
148
149	/* Point at first byte of argument data, and at descriptor for first
150	argument. */
151	arg = buffer + ((votp->detail.code >> 8) ? 2 : 1);
152
153	/* Make sure we have it in mem */
154	FETCH_DATA (info, arg);
155
156	(*info->fprintf_func) (info->stream, "%s", votp->name);
157	if (*argp)
158	(*info->fprintf_func) (info->stream, " ");
159
160	while (*argp)
161	{
162	arg += print_insn_arg (argp, arg, memaddr + arg - buffer, info);
163	argp += 2;
164	if (*argp)
165	(*info->fprintf_func) (info->stream, ",");
166	}
167
168	return arg - buffer;
169	}
170
171	/* Returns number of bytes "eaten" by the operand, or return -1 if an
172	invalid operand was found, or -2 if an opcode tabel error was
173	found. */
174
175	static int
176	print_insn_arg (d, p0, addr, info)
177	const char *d;
178	unsigned char *p0;
179	bfd_vma addr; /* PC for this arg to be relative to */
180	disassemble_info *info;
181	{
182	int arg_len;
183
184	/* check validity of addressing length */
185	switch (d[1])
186	{
187	case 'b' : arg_len = 1; break;
188	case 'd' : arg_len = 8; break;
189	case 'f' : arg_len = 4; break;
190	case 'g' : arg_len = 8; break;
191	case 'h' : arg_len = 16; break;
192	case 'l' : arg_len = 4; break;
193	case 'o' : arg_len = 16; break;
194	case 'w' : arg_len = 2; break;
195	case 'q' : arg_len = 8; break;
196	default : abort();
197	}
198
199	/* branches have no mode byte */
200	if (d[0] == 'b')
201	{
202	unsigned char *p = p0;
203
204	if (arg_len == 1)
205	(*info->print_address_func) (addr + 1 + NEXTBYTE (p), info);
206	else
207	(*info->print_address_func) (addr + 2 + NEXTWORD (p), info);
208
209	return p - p0;
210	}
211
212	return print_insn_mode (arg_len, p0, addr, info);
213	}
214
215	static int
216	print_insn_mode (size, p0, addr, info)
217	int size;
218	unsigned char *p0;
219	bfd_vma addr; /* PC for this arg to be relative to */
220	disassemble_info *info;
221	{
222	unsigned char *p = p0;
223	unsigned char mode, reg;
224
225	/* fetch and interpret mode byte */
226	mode = (unsigned char) NEXTBYTE (p);
227	reg = mode & 0xF;
228	switch (mode & 0xF0)
229	{
230	case 0x00:
231	case 0x10:
232	case 0x20:
233	case 0x30: /* literal mode $number */
234	(*info->fprintf_func) (info->stream, "$0x%x", mode);
235	break;
236	case 0x40: /* index: base-addr[Rn] */
237	p += print_insn_mode (size, p0 + 1, addr + 1, info);
238	(*info->fprintf_func) (info->stream, "[%s]", reg_names[reg]);
239	break;
240	case 0x50: /* register: Rn */
241	(*info->fprintf_func) (info->stream, "%s", reg_names[reg]);
242	break;
243	case 0x60: /* register deferred: (Rn) */
244	(*info->fprintf_func) (info->stream, "(%s)", reg_names[reg]);
245	break;
246	case 0x70: /* autodecrement: -(Rn) */
247	(*info->fprintf_func) (info->stream, "-(%s)", reg_names[reg]);
248	break;
249	case 0x80: /* autoincrement: (Rn)+ */
250	if (reg == 0xF)
251	{ /* immediate? */
252	int i;
253
254	FETCH_DATA (info, p + size);
255	(*info->fprintf_func) (info->stream, "$0x");
256	for (i = 0; i < size; i++)
257	(*info->fprintf_func) (info->stream, "%02x", p[size - i - 1]);
258	p += size;
259	}
260	else
261	(*info->fprintf_func) (info->stream, "(%s)+", reg_names[reg]);
262	break;
263	case 0x90: /* autoincrement deferred: @(Rn)+ */
264	if (reg == 0xF)
265	(info->fprintf_func) (info->stream, "0x%x", NEXTLONG (p));
266	else
267	(*info->fprintf_func) (info->stream, "@(%s)+", reg_names[reg]);
268	break;
269	case 0xB0: /* displacement byte deferred: displ(Rn) /
270	(info->fprintf_func) (info->stream, "");
271	case 0xA0: /* displacement byte: displ(Rn) */
272	if (reg == 0xF)
273	(*info->print_address_func) (addr + 2 + NEXTBYTE (p), info);
274	else
275	(*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTBYTE (p),
276	reg_names[reg]);
277	break;
278	case 0xD0: /* displacement word deferred: displ(Rn) /
279	(info->fprintf_func) (info->stream, "");
280	case 0xC0: /* displacement word: displ(Rn) */
281	if (reg == 0xF)
282	(*info->print_address_func) (addr + 3 + NEXTWORD (p), info);
283	else
284	(*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTWORD (p),
285	reg_names[reg]);
286	break;
287	case 0xF0: /* displacement long deferred: displ(Rn) /
288	(info->fprintf_func) (info->stream, "");
289	case 0xE0: /* displacement long: displ(Rn) */
290	if (reg == 0xF)
291	(*info->print_address_func) (addr + 5 + NEXTLONG (p), info);
292	else
293	(*info->fprintf_func) (info->stream, "0x%x(%s)", NEXTLONG (p),
294	reg_names[reg]);
295	break;
296	}
297
298	return p - p0;
299	}