1 /* Print VAX instructions for GDB, the GNU debugger.
2 Copyright 1986, 1989, 1991, 1992, 1996 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
23 #include "opcode/vax.h"
25 /* Vax instructions are never longer than this. */
28 /* Number of elements in the opcode table. */
29 #define NOPCODES (sizeof votstrs / sizeof votstrs[0])
31 static unsigned char *print_insn_arg ();
33 /* Advance PC across any function entry prologue instructions
34 to reach some "real" code. */
37 vax_skip_prologue (CORE_ADDR pc
)
39 register int op
= (unsigned char) read_memory_integer (pc
, 1);
41 pc
+= 2; /* skip brb */
43 pc
+= 3; /* skip brw */
45 && ((unsigned char) read_memory_integer (pc
+ 2, 1)) == 0x5E)
46 pc
+= 3; /* skip subl2 */
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 */
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 */
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 */
62 /* Return number of args passed to a frame.
63 Can return -1, meaning no way to tell. */
66 vax_frame_num_args (struct frame_info
*fi
)
68 return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi
), 1));
73 /* Print the vax instruction at address MEMADDR in debugged memory,
74 from disassembler info INFO.
75 Returns length of the instruction, in bytes. */
78 vax_print_insn (CORE_ADDR memaddr
, disassemble_info
*info
)
80 unsigned char buffer
[MAXLEN
];
82 register unsigned char *p
;
85 int status
= (*info
->read_memory_func
) (memaddr
, buffer
, MAXLEN
, info
);
88 (*info
->memory_error_func
) (status
, memaddr
, info
);
92 for (i
= 0; i
< NOPCODES
; i
++)
93 if (votstrs
[i
].detail
.code
== buffer
[0]
94 || votstrs
[i
].detail
.code
== *(unsigned short *) buffer
)
97 /* Handle undefined instructions. */
100 (*info
->fprintf_func
) (info
->stream
, "0%o", buffer
[0]);
104 (*info
->fprintf_func
) (info
->stream
, "%s", votstrs
[i
].name
);
106 /* Point at first byte of argument data,
107 and at descriptor for first argument. */
108 p
= buffer
+ 1 + (votstrs
[i
].detail
.code
>= 0x100);
109 d
= votstrs
[i
].detail
.args
;
112 (*info
->fprintf_func
) (info
->stream
, " ");
116 p
= print_insn_arg (d
, p
, memaddr
+ (p
- buffer
), info
);
119 (*info
->fprintf_func
) (info
->stream
, ",");
124 static unsigned char *
125 print_insn_arg (char *d
, register char *p
, CORE_ADDR addr
,
126 disassemble_info
*info
)
128 register int regnum
= *p
& 0xf;
134 (*info
->fprintf_func
) (info
->stream
, "0x%x", addr
+ *p
++ + 1);
137 (*info
->fprintf_func
) (info
->stream
, "0x%x", addr
+ *(short *) p
+ 2);
142 switch ((*p
++ >> 4) & 0xf)
147 case 3: /* Literal mode */
148 if (d
[1] == 'd' || d
[1] == 'f' || d
[1] == 'g' || d
[1] == 'h')
150 *(int *) &floatlitbuf
= 0x4000 + ((p
[-1] & 0x3f) << 4);
151 (*info
->fprintf_func
) (info
->stream
, "$%f", floatlitbuf
);
154 (*info
->fprintf_func
) (info
->stream
, "$%d", p
[-1] & 0x3f);
157 case 4: /* Indexed */
158 p
= (char *) print_insn_arg (d
, p
, addr
+ 1, info
);
159 (*info
->fprintf_func
) (info
->stream
, "[%s]", REGISTER_NAME (regnum
));
162 case 5: /* Register */
163 (*info
->fprintf_func
) (info
->stream
, REGISTER_NAME (regnum
));
166 case 7: /* Autodecrement */
167 (*info
->fprintf_func
) (info
->stream
, "-");
168 case 6: /* Register deferred */
169 (*info
->fprintf_func
) (info
->stream
, "(%s)", REGISTER_NAME (regnum
));
172 case 9: /* Autoincrement deferred */
173 (*info
->fprintf_func
) (info
->stream
, "@");
174 if (regnum
== PC_REGNUM
)
176 (*info
->fprintf_func
) (info
->stream
, "#");
177 info
->target
= *(long *) p
;
178 (*info
->print_address_func
) (info
->target
, info
);
182 case 8: /* Autoincrement */
183 if (regnum
== PC_REGNUM
)
185 (*info
->fprintf_func
) (info
->stream
, "#");
189 (*info
->fprintf_func
) (info
->stream
, "%d", *p
++);
193 (*info
->fprintf_func
) (info
->stream
, "%d", *(short *) p
);
198 (*info
->fprintf_func
) (info
->stream
, "%d", *(long *) p
);
203 (*info
->fprintf_func
) (info
->stream
, "0x%x%08x",
204 ((long *) p
)[1], ((long *) p
)[0]);
209 (*info
->fprintf_func
) (info
->stream
, "0x%x%08x%08x%08x",
210 ((long *) p
)[3], ((long *) p
)[2],
211 ((long *) p
)[1], ((long *) p
)[0]);
216 if (INVALID_FLOAT (p
, 4))
217 (*info
->fprintf_func
) (info
->stream
,
218 "<<invalid float 0x%x>>",
221 (*info
->fprintf_func
) (info
->stream
, "%f", *(float *) p
);
226 if (INVALID_FLOAT (p
, 8))
227 (*info
->fprintf_func
) (info
->stream
,
228 "<<invalid float 0x%x%08x>>",
229 ((long *) p
)[1], ((long *) p
)[0]);
231 (*info
->fprintf_func
) (info
->stream
, "%f", *(double *) p
);
236 (*info
->fprintf_func
) (info
->stream
, "g-float");
241 (*info
->fprintf_func
) (info
->stream
, "h-float");
248 (*info
->fprintf_func
) (info
->stream
, "(%s)+", REGISTER_NAME (regnum
));
251 case 11: /* Byte displacement deferred */
252 (*info
->fprintf_func
) (info
->stream
, "@");
253 case 10: /* Byte displacement */
254 if (regnum
== PC_REGNUM
)
256 info
->target
= addr
+ *p
+ 2;
257 (*info
->print_address_func
) (info
->target
, info
);
260 (*info
->fprintf_func
) (info
->stream
, "%d(%s)", *p
, REGISTER_NAME (regnum
));
264 case 13: /* Word displacement deferred */
265 (*info
->fprintf_func
) (info
->stream
, "@");
266 case 12: /* Word displacement */
267 if (regnum
== PC_REGNUM
)
269 info
->target
= addr
+ *(short *) p
+ 3;
270 (*info
->print_address_func
) (info
->target
, info
);
273 (*info
->fprintf_func
) (info
->stream
, "%d(%s)",
274 *(short *) p
, REGISTER_NAME (regnum
));
278 case 15: /* Long displacement deferred */
279 (*info
->fprintf_func
) (info
->stream
, "@");
280 case 14: /* Long displacement */
281 if (regnum
== PC_REGNUM
)
283 info
->target
= addr
+ *(short *) p
+ 5;
284 (*info
->print_address_func
) (info
->target
, info
);
287 (*info
->fprintf_func
) (info
->stream
, "%d(%s)",
288 *(long *) p
, REGISTER_NAME (regnum
));
292 return (unsigned char *) p
;
296 _initialize_vax_tdep (void)
298 tm_print_insn
= vax_print_insn
;
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