1 /* Print vax instructions for GDB, the GNU debugger.
2 Copyright (C) 1986, 1989 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. */
25 #include "vax-opcode.h"
27 /* Vax instructions are never longer than this. */
30 /* Number of elements in the opcode table. */
31 #define NOPCODES (sizeof votstrs / sizeof votstrs[0])
33 extern char *reg_names
[];
35 static unsigned char *print_insn_arg ();
37 /* Print the vax instruction at address MEMADDR in debugged memory,
38 on STREAM. Returns length of the instruction, in bytes. */
41 print_insn (memaddr
, stream
)
45 unsigned char buffer
[MAXLEN
];
47 register unsigned char *p
;
50 read_memory (memaddr
, buffer
, MAXLEN
);
52 for (i
= 0; i
< NOPCODES
; i
++)
53 if (votstrs
[i
].detail
.code
== buffer
[0]
54 || votstrs
[i
].detail
.code
== *(unsigned short *)buffer
)
57 /* Handle undefined instructions. */
60 fprintf (stream
, "0%o", buffer
[0]);
64 fprintf (stream
, "%s", votstrs
[i
].name
);
66 /* Point at first byte of argument data,
67 and at descriptor for first argument. */
68 p
= buffer
+ 1 + (votstrs
[i
].detail
.code
>= 0x100);
69 d
= votstrs
[i
].detail
.args
;
76 p
= print_insn_arg (d
, p
, memaddr
+ (p
- buffer
), stream
);
79 fprintf (stream
, ",");
84 static unsigned char *
85 print_insn_arg (d
, p
, addr
, stream
)
91 register int regnum
= *p
& 0xf;
97 fprintf (stream
, "0x%x", addr
+ *p
++ + 1);
100 fprintf (stream
, "0x%x", addr
+ *(short *)p
+ 2);
105 switch ((*p
++ >> 4) & 0xf)
110 case 3: /* Literal mode */
111 if (d
[1] == 'd' || d
[1] == 'f' || d
[1] == 'g' || d
[1] == 'h')
113 *(int *)&floatlitbuf
= 0x4000 + ((p
[-1] & 0x3f) << 4);
114 fprintf (stream
, "$%f", floatlitbuf
);
117 fprintf (stream
, "$%d", p
[-1] & 0x3f);
120 case 4: /* Indexed */
121 p
= (char *) print_insn_arg (d
, p
, addr
+ 1, stream
);
122 fprintf (stream
, "[%s]", reg_names
[regnum
]);
125 case 5: /* Register */
126 fprintf (stream
, reg_names
[regnum
]);
129 case 7: /* Autodecrement */
131 case 6: /* Register deferred */
132 fprintf (stream
, "(%s)", reg_names
[regnum
]);
135 case 9: /* Autoincrement deferred */
137 if (regnum
== PC_REGNUM
)
140 print_address (*(long *)p
, stream
);
144 case 8: /* Autoincrement */
145 if (regnum
== PC_REGNUM
)
151 fprintf (stream
, "%d", *p
++);
155 fprintf (stream
, "%d", *(short *)p
);
160 fprintf (stream
, "%d", *(long *)p
);
165 fprintf (stream
, "0x%x%08x", ((long *)p
)[1], ((long *)p
)[0]);
170 fprintf (stream
, "0x%x%08x%08x%08x",
171 ((long *)p
)[3], ((long *)p
)[2],
172 ((long *)p
)[1], ((long *)p
)[0]);
177 if (INVALID_FLOAT (p
, 4))
178 fprintf (stream
, "<<invalid float 0x%x>>", *(int *) p
);
180 fprintf (stream
, "%f", *(float *) p
);
185 if (INVALID_FLOAT (p
, 8))
186 fprintf (stream
, "<<invalid float 0x%x%08x>>",
187 ((long *)p
)[1], ((long *)p
)[0]);
189 fprintf (stream
, "%f", *(double *) p
);
194 fprintf (stream
, "g-float");
199 fprintf (stream
, "h-float");
206 fprintf (stream
, "(%s)+", reg_names
[regnum
]);
209 case 11: /* Byte displacement deferred */
211 case 10: /* Byte displacement */
212 if (regnum
== PC_REGNUM
)
213 print_address (addr
+ *p
+ 2, stream
);
215 fprintf (stream
, "%d(%s)", *p
, reg_names
[regnum
]);
219 case 13: /* Word displacement deferred */
221 case 12: /* Word displacement */
222 if (regnum
== PC_REGNUM
)
223 print_address (addr
+ *(short *)p
+ 3, stream
);
225 fprintf (stream
, "%d(%s)", *(short *)p
, reg_names
[regnum
]);
229 case 15: /* Long displacement deferred */
231 case 14: /* Long displacement */
232 if (regnum
== PC_REGNUM
)
233 print_address (addr
+ *(long *)p
+ 5, stream
);
235 fprintf (stream
, "%d(%s)", *(long *)p
, reg_names
[regnum
]);
239 return (unsigned char *) p
;
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