1 /* Print instructions for Tahoe target machines, for GDB.
2 Copyright 1986, 1989, 1991 Free Software Foundation, Inc.
3 Contributed by the State University of New York at Buffalo, by the
4 Distributed Computer Systems Lab, Department of Computer Science, 1991.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
25 #include "opcode/tahoe.h"
27 /* Tahoe 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 Tahoe 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
, ",");
83 /*******************************************************************/
84 static unsigned char *
85 print_insn_arg (d
, p
, addr
, stream
)
92 register int regnum
= *p
& 0xf;
98 fprintf (stream
, "0x%x", addr
+ *p
++ + 1);
105 fprintf (stream
, "0x%x", addr
+ temp1
+ 2);
110 switch ((*p
++ >> 4) & 0xf)
115 case 3: /* Literal (short immediate byte) mode */
116 if (d
[1] == 'd' || d
[1] == 'f' || d
[1] == 'g' || d
[1] == 'h')
118 *(int *)&floatlitbuf
= 0x4000 + ((p
[-1] & 0x3f) << 4);
119 fprintf (stream
, "$%f", floatlitbuf
);
122 fprintf (stream
, "$%d", p
[-1] & 0x3f);
125 case 4: /* Indexed */
126 p
= (char *) print_insn_arg (d
, p
, addr
+ 1, stream
);
127 fprintf (stream
, "[%s]", reg_names
[regnum
]);
130 case 5: /* Register */
131 fprintf (stream
, reg_names
[regnum
]);
134 case 7: /* Autodecrement */
136 case 6: /* Register deferred */
137 fprintf (stream
, "(%s)", reg_names
[regnum
]);
140 case 9: /* Absolute Address & Autoincrement deferred */
142 if (regnum
== PC_REGNUM
)
149 print_address (temp1
, stream
);
153 case 8: /*Immediate & Autoincrement SP */
154 if (regnum
== 8) /*88 is Immediate Byte Mode*/
155 fprintf (stream
, "$%d", *p
++);
157 else if (regnum
== 9) /*89 is Immediate Word Mode*/
162 fprintf (stream
, "$%d", temp1
);
166 else if (regnum
== PC_REGNUM
) /*8F is Immediate Long Mode*/
175 fprintf (stream
, "$%d", temp1
);
179 else /*8E is Autoincrement SP Mode*/
180 fprintf (stream
, "(%s)+", reg_names
[regnum
]);
183 case 11: /* Register + Byte Displacement Deferred Mode*/
185 case 10: /* Register + Byte Displacement Mode*/
186 if (regnum
== PC_REGNUM
)
187 print_address (addr
+ *p
+ 2, stream
);
189 fprintf (stream
, "%d(%s)", *p
, reg_names
[regnum
]);
193 case 13: /* Register + Word Displacement Deferred Mode*/
195 case 12: /* Register + Word Displacement Mode*/
199 if (regnum
== PC_REGNUM
)
200 print_address (addr
+ temp1
+ 3, stream
);
202 fprintf (stream
, "%d(%s)", temp1
, reg_names
[regnum
]);
206 case 15: /* Register + Long Displacement Deferred Mode*/
208 case 14: /* Register + Long Displacement Mode*/
216 if (regnum
== PC_REGNUM
)
217 print_address (addr
+ temp1
+ 5, stream
);
219 fprintf (stream
, "%d(%s)", temp1
, reg_names
[regnum
]);
223 return (unsigned char *) p
;