ccbf19b8e858a2d6c3dde02bb32470105fd702bd
1 /* Print VAX instructions for GDB, the GNU debugger.
2 Copyright 1986, 1989, 1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #include "vax-opcode.h"
26 /* Vax instructions are never longer than this. */
29 /* Number of elements in the opcode table. */
30 #define NOPCODES (sizeof votstrs / sizeof votstrs[0])
32 extern char *reg_names
[];
34 static unsigned char *print_insn_arg ();
36 /* Print the vax instruction at address MEMADDR in debugged memory,
37 on STREAM. Returns length of the instruction, in bytes. */
40 print_insn (memaddr
, stream
)
44 unsigned char buffer
[MAXLEN
];
46 register unsigned char *p
;
49 read_memory (memaddr
, buffer
, MAXLEN
);
51 for (i
= 0; i
< NOPCODES
; i
++)
52 if (votstrs
[i
].detail
.code
== buffer
[0]
53 || votstrs
[i
].detail
.code
== *(unsigned short *)buffer
)
56 /* Handle undefined instructions. */
59 fprintf (stream
, "0%o", buffer
[0]);
63 fprintf (stream
, "%s", votstrs
[i
].name
);
65 /* Point at first byte of argument data,
66 and at descriptor for first argument. */
67 p
= buffer
+ 1 + (votstrs
[i
].detail
.code
>= 0x100);
68 d
= votstrs
[i
].detail
.args
;
75 p
= print_insn_arg (d
, p
, memaddr
+ (p
- buffer
), stream
);
78 fprintf (stream
, ",");
83 static unsigned char *
84 print_insn_arg (d
, p
, addr
, stream
)
90 register int regnum
= *p
& 0xf;
96 fprintf (stream
, "0x%x", addr
+ *p
++ + 1);
99 fprintf (stream
, "0x%x", addr
+ *(short *)p
+ 2);
104 switch ((*p
++ >> 4) & 0xf)
109 case 3: /* Literal mode */
110 if (d
[1] == 'd' || d
[1] == 'f' || d
[1] == 'g' || d
[1] == 'h')
112 *(int *)&floatlitbuf
= 0x4000 + ((p
[-1] & 0x3f) << 4);
113 fprintf (stream
, "$%f", floatlitbuf
);
116 fprintf (stream
, "$%d", p
[-1] & 0x3f);
119 case 4: /* Indexed */
120 p
= (char *) print_insn_arg (d
, p
, addr
+ 1, stream
);
121 fprintf (stream
, "[%s]", reg_names
[regnum
]);
124 case 5: /* Register */
125 fprintf (stream
, reg_names
[regnum
]);
128 case 7: /* Autodecrement */
130 case 6: /* Register deferred */
131 fprintf (stream
, "(%s)", reg_names
[regnum
]);
134 case 9: /* Autoincrement deferred */
136 if (regnum
== PC_REGNUM
)
139 print_address (*(long *)p
, stream
);
143 case 8: /* Autoincrement */
144 if (regnum
== PC_REGNUM
)
150 fprintf (stream
, "%d", *p
++);
154 fprintf (stream
, "%d", *(short *)p
);
159 fprintf (stream
, "%d", *(long *)p
);
164 fprintf (stream
, "0x%x%08x", ((long *)p
)[1], ((long *)p
)[0]);
169 fprintf (stream
, "0x%x%08x%08x%08x",
170 ((long *)p
)[3], ((long *)p
)[2],
171 ((long *)p
)[1], ((long *)p
)[0]);
176 if (INVALID_FLOAT (p
, 4))
177 fprintf (stream
, "<<invalid float 0x%x>>", *(int *) p
);
179 fprintf (stream
, "%f", *(float *) p
);
184 if (INVALID_FLOAT (p
, 8))
185 fprintf (stream
, "<<invalid float 0x%x%08x>>",
186 ((long *)p
)[1], ((long *)p
)[0]);
188 fprintf (stream
, "%f", *(double *) p
);
193 fprintf (stream
, "g-float");
198 fprintf (stream
, "h-float");
205 fprintf (stream
, "(%s)+", reg_names
[regnum
]);
208 case 11: /* Byte displacement deferred */
210 case 10: /* Byte displacement */
211 if (regnum
== PC_REGNUM
)
212 print_address (addr
+ *p
+ 2, stream
);
214 fprintf (stream
, "%d(%s)", *p
, reg_names
[regnum
]);
218 case 13: /* Word displacement deferred */
220 case 12: /* Word displacement */
221 if (regnum
== PC_REGNUM
)
222 print_address (addr
+ *(short *)p
+ 3, stream
);
224 fprintf (stream
, "%d(%s)", *(short *)p
, reg_names
[regnum
]);
228 case 15: /* Long displacement deferred */
230 case 14: /* Long displacement */
231 if (regnum
== PC_REGNUM
)
232 print_address (addr
+ *(long *)p
+ 5, stream
);
234 fprintf (stream
, "%d(%s)", *(long *)p
, reg_names
[regnum
]);
238 return (unsigned char *) p
;