1 /* Print VAX instructions.
2 Copyright (C) 1995, 1998 Free Software Foundation, Inc.
3 Contributed by Pauline Middelink <middelin@polyware.iaf.nl>
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.
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.
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. */
20 #include "opcode/vax.h"
23 /* Local function prototypes */
25 print_insn_arg
PARAMS ((const char *, unsigned char *, bfd_vma
,
29 print_insn_mode
PARAMS ((int, unsigned char *, bfd_vma
, disassemble_info
*));
31 static char *reg_names
[] =
33 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
34 "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc"
37 /* Sign-extend an (unsigned char). */
39 #define COERCE_SIGNED_CHAR(ch) ((signed char)(ch))
41 #define COERCE_SIGNED_CHAR(ch) ((int)(((ch) ^ 0x80) & 0xFF) - 128)
44 /* Get a 1 byte signed integer. */
46 (p += 1, FETCH_DATA (info, p), \
47 COERCE_SIGNED_CHAR(p[-1]))
49 /* Get a 2 byte signed integer. */
50 #define COERCE16(x) ((int) (((x) ^ 0x8000) - 0x8000))
52 (p += 2, FETCH_DATA (info, p), \
53 COERCE16 ((p[-1] << 8) + p[-2]))
55 /* Get a 4 byte signed integer. */
56 #define COERCE32(x) ((int) (((x) ^ 0x80000000) - 0x80000000))
58 (p += 4, FETCH_DATA (info, p), \
59 (COERCE32 ((((((p[-1] << 8) + p[-2]) << 8) + p[-3]) << 8) + p[-4])))
61 /* Maximum length of an instruction. */
68 /* Points to first byte not fetched. */
69 bfd_byte
*max_fetched
;
70 bfd_byte the_buffer
[MAXLEN
];
75 /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
76 to ADDR (exclusive) are valid. Returns 1 for success, longjmps
78 #define FETCH_DATA(info, addr) \
79 ((addr) <= ((struct private *)(info->private_data))->max_fetched \
80 ? 1 : fetch_data ((info), (addr)))
83 fetch_data (info
, addr
)
84 struct disassemble_info
*info
;
88 struct private *priv
= (struct private *) info
->private_data
;
89 bfd_vma start
= priv
->insn_start
+ (priv
->max_fetched
- priv
->the_buffer
);
91 status
= (*info
->read_memory_func
) (start
,
93 addr
- priv
->max_fetched
,
97 (*info
->memory_error_func
) (status
, start
, info
);
98 longjmp (priv
->bailout
, 1);
101 priv
->max_fetched
= addr
;
106 /* Print the vax instruction at address MEMADDR in debugged memory,
107 on INFO->STREAM. Returns length of the instruction, in bytes. */
110 print_insn_vax (memaddr
, info
)
112 disassemble_info
*info
;
114 const struct vot
*votp
;
115 const char *argp
= NULL
;
118 bfd_byte
*buffer
= priv
.the_buffer
;
120 info
->private_data
= (PTR
) &priv
;
121 priv
.max_fetched
= priv
.the_buffer
;
122 priv
.insn_start
= memaddr
;
123 if (setjmp (priv
.bailout
) != 0)
129 FETCH_DATA (info
, buffer
+ 2);
130 for (votp
= &votstrs
[0]; votp
->name
[0]; votp
++)
132 register vax_opcodeT opcode
= votp
->detail
.code
;
134 /* 2 byte codes match 2 buffer pos. */
135 if ((bfd_byte
) opcode
== buffer
[0]
136 && (opcode
>> 8 == 0 || opcode
>> 8 == buffer
[1]))
138 argp
= votp
->detail
.args
;
144 /* Handle undefined instructions. */
145 (*info
->fprintf_func
) (info
->stream
, ".word 0x%x",
146 (buffer
[0] << 8) + buffer
[1]);
150 /* Point at first byte of argument data, and at descriptor for first
152 arg
= buffer
+ ((votp
->detail
.code
>> 8) ? 2 : 1);
154 /* Make sure we have it in mem */
155 FETCH_DATA (info
, arg
);
157 (*info
->fprintf_func
) (info
->stream
, "%s", votp
->name
);
159 (*info
->fprintf_func
) (info
->stream
, " ");
163 arg
+= print_insn_arg (argp
, arg
, memaddr
+ arg
- buffer
, info
);
166 (*info
->fprintf_func
) (info
->stream
, ",");
172 /* Returns number of bytes "eaten" by the operand, or return -1 if an
173 invalid operand was found, or -2 if an opcode tabel error was
177 print_insn_arg (d
, p0
, addr
, info
)
180 bfd_vma addr
; /* PC for this arg to be relative to */
181 disassemble_info
*info
;
185 /* check validity of addressing length */
188 case 'b' : arg_len
= 1; break;
189 case 'd' : arg_len
= 8; break;
190 case 'f' : arg_len
= 4; break;
191 case 'g' : arg_len
= 8; break;
192 case 'h' : arg_len
= 16; break;
193 case 'l' : arg_len
= 4; break;
194 case 'o' : arg_len
= 16; break;
195 case 'w' : arg_len
= 2; break;
196 case 'q' : arg_len
= 8; break;
200 /* branches have no mode byte */
203 unsigned char *p
= p0
;
206 (*info
->print_address_func
) (addr
+ 1 + NEXTBYTE (p
), info
);
208 (*info
->print_address_func
) (addr
+ 2 + NEXTWORD (p
), info
);
213 return print_insn_mode (arg_len
, p0
, addr
, info
);
217 print_insn_mode (size
, p0
, addr
, info
)
220 bfd_vma addr
; /* PC for this arg to be relative to */
221 disassemble_info
*info
;
223 unsigned char *p
= p0
;
224 unsigned char mode
, reg
;
226 /* fetch and interpret mode byte */
227 mode
= (unsigned char) NEXTBYTE (p
);
234 case 0x30: /* literal mode $number */
235 (*info
->fprintf_func
) (info
->stream
, "$0x%x", mode
);
237 case 0x40: /* index: base-addr[Rn] */
238 p
+= print_insn_mode (size
, p0
+ 1, addr
+ 1, info
);
239 (*info
->fprintf_func
) (info
->stream
, "[%s]", reg_names
[reg
]);
241 case 0x50: /* register: Rn */
242 (*info
->fprintf_func
) (info
->stream
, "%s", reg_names
[reg
]);
244 case 0x60: /* register deferred: (Rn) */
245 (*info
->fprintf_func
) (info
->stream
, "(%s)", reg_names
[reg
]);
247 case 0x70: /* autodecrement: -(Rn) */
248 (*info
->fprintf_func
) (info
->stream
, "-(%s)", reg_names
[reg
]);
250 case 0x80: /* autoincrement: (Rn)+ */
255 FETCH_DATA (info
, p
+ size
);
256 (*info
->fprintf_func
) (info
->stream
, "$0x");
257 for (i
= 0; i
< size
; i
++)
258 (*info
->fprintf_func
) (info
->stream
, "%02x", p
[size
- i
- 1]);
262 (*info
->fprintf_func
) (info
->stream
, "(%s)+", reg_names
[reg
]);
264 case 0x90: /* autoincrement deferred: @(Rn)+ */
266 (*info
->fprintf_func
) (info
->stream
, "*0x%x", NEXTLONG (p
));
268 (*info
->fprintf_func
) (info
->stream
, "@(%s)+", reg_names
[reg
]);
270 case 0xB0: /* displacement byte deferred: *displ(Rn) */
271 (*info
->fprintf_func
) (info
->stream
, "*");
272 case 0xA0: /* displacement byte: displ(Rn) */
274 (*info
->print_address_func
) (addr
+ 2 + NEXTBYTE (p
), info
);
276 (*info
->fprintf_func
) (info
->stream
, "0x%x(%s)", NEXTBYTE (p
),
279 case 0xD0: /* displacement word deferred: *displ(Rn) */
280 (*info
->fprintf_func
) (info
->stream
, "*");
281 case 0xC0: /* displacement word: displ(Rn) */
283 (*info
->print_address_func
) (addr
+ 3 + NEXTWORD (p
), info
);
285 (*info
->fprintf_func
) (info
->stream
, "0x%x(%s)", NEXTWORD (p
),
288 case 0xF0: /* displacement long deferred: *displ(Rn) */
289 (*info
->fprintf_func
) (info
->stream
, "*");
290 case 0xE0: /* displacement long: displ(Rn) */
292 (*info
->print_address_func
) (addr
+ 5 + NEXTLONG (p
), info
);
294 (*info
->fprintf_func
) (info
->stream
, "0x%x(%s)", NEXTLONG (p
),
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