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1.1 root 1: /* Print vax instructions for GDB, the GNU debugger.
2: Copyright (C) 1986 Free Software Foundation, Inc.
3:
4: GDB is distributed in the hope that it will be useful, but WITHOUT ANY
5: WARRANTY. No author or distributor accepts responsibility to anyone
6: for the consequences of using it or for whether it serves any
7: particular purpose or works at all, unless he says so in writing.
8: Refer to the GDB General Public License for full details.
9:
10: Everyone is granted permission to copy, modify and redistribute GDB,
11: but only under the conditions described in the GDB General Public
12: License. A copy of this license is supposed to have been given to you
13: along with GDB so you can know your rights and responsibilities. It
14: should be in a file named COPYING. Among other things, the copyright
15: notice and this notice must be preserved on all copies.
16:
17: In other words, go ahead and share GDB, but don't try to stop
18: anyone else from sharing it farther. Help stamp out software hoarding!
19: */
20:
21: #include <stdio.h>
22:
23: #include "defs.h"
24: #include "param.h"
25: #include "symtab.h"
26: #include "opcode.h"
27:
28: /* Vax instructions are never longer than this. */
29: #define MAXLEN 62
30:
31: /* Number of elements in the opcode table. */
32: #define NOPCODES (sizeof votstrs / sizeof votstrs[0])
33:
34: extern char *reg_names[];
35:
36: static unsigned char *print_insn_arg ();
37:
38: /* Print the vax instruction at address MEMADDR in debugged memory,
39: on STREAM. Returns length of the instruction, in bytes. */
40:
41: int
42: print_insn (memaddr, stream)
43: CORE_ADDR memaddr;
44: FILE *stream;
45: {
46: unsigned char buffer[MAXLEN];
47: register int i;
48: register unsigned char *p;
49: register char *d;
50:
51: read_memory (memaddr, buffer, MAXLEN);
52:
53: for (i = 0; i < NOPCODES; i++)
54: if (votstrs[i].detail.code == buffer[0]
55: || votstrs[i].detail.code == *(unsigned short *)buffer)
56: break;
57:
58: /* Handle undefined instructions. */
59: if (i == NOPCODES)
60: {
61: fprintf (stream, "0%o", buffer[0]);
62: return 1;
63: }
64:
65: fprintf (stream, "%s", votstrs[i].name);
66:
67: /* Point at first byte of argument data,
68: and at descriptor for first argument. */
69: p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
70: d = votstrs[i].detail.args;
71:
72: if (*d)
73: fputc (' ', stream);
74:
75: while (*d)
76: {
77: p = print_insn_arg (d, p, memaddr + (p - buffer), stream);
78: d += 2;
79: if (*d)
80: fprintf (stream, ",");
81: }
82: return p - buffer;
83: }
84:
85: static unsigned char *
86: print_insn_arg (d, p, addr, stream)
87: char *d;
88: register char *p;
89: CORE_ADDR addr;
90: FILE *stream;
91: {
92: register int regnum = *p & 0xf;
93: float floatlitbuf;
94:
95: if (*d == 'b')
96: {
97: if (d[1] == 'b')
98: fprintf (stream, "0x%x", addr + *p++ + 1);
99: else
100: {
101: fprintf (stream, "0x%x", addr + *(short *)p + 2);
102: p += 2;
103: }
104: }
105: else
106: switch ((*p++ >> 4) & 0xf)
107: {
108: case 0:
109: case 1:
110: case 2:
111: case 3: /* Literal mode */
112: if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h')
113: {
114: *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
115: fprintf (stream, "$%f", floatlitbuf);
116: }
117: else
118: fprintf (stream, "$%d", p[-1] & 0x3f);
119: break;
120:
121: case 4: /* Indexed */
122: p = (char *) print_insn_arg (d, p, addr + 1, stream);
123: fprintf (stream, "[%s]", reg_names[regnum]);
124: break;
125:
126: case 5: /* Register */
127: fprintf (stream, reg_names[regnum]);
128: break;
129:
130: case 7: /* Autodecrement */
131: fputc ('-', stream);
132: case 6: /* Register deferred */
133: fprintf (stream, "(%s)", reg_names[regnum]);
134: break;
135:
136: case 9: /* Autoincrement deferred */
137: fputc ('@', stream);
138: if (regnum == PC_REGNUM)
139: {
140: fputc ('#', stream);
141: print_address (*(long *)p, stream);
142: p += 4;
143: break;
144: }
145: case 8: /* Autoincrement */
146: if (regnum == PC_REGNUM)
147: {
148: fputc ('#', stream);
149: switch (d[1])
150: {
151: case 'b':
152: fprintf (stream, "%d", *p++);
153: break;
154:
155: case 'w':
156: fprintf (stream, "%d", *(short *)p);
157: p += 2;
158: break;
159:
160: case 'l':
161: fprintf (stream, "%d", *(long *)p);
162: p += 4;
163: break;
164:
165: case 'q':
166: fprintf (stream, "0x%x%08x", ((long *)p)[1], ((long *)p)[0]);
167: p += 8;
168: break;
169:
170: case 'o':
171: fprintf (stream, "0x%x%08x%08x%08x",
172: ((long *)p)[3], ((long *)p)[2],
173: ((long *)p)[1], ((long *)p)[0]);
174: p += 16;
175: break;
176:
177: case 'f':
178: if (INVALID_FLOAT (p, 4))
179: fprintf (stream, "<<invalid float 0x%x>>", *(int *) p);
180: else
181: fprintf (stream, "%f", *(float *) p);
182: p += 4;
183: break;
184:
185: case 'd':
186: if (INVALID_FLOAT (p, 8))
187: fprintf (stream, "<<invalid float 0x%x%08x>>",
188: ((long *)p)[1], ((long *)p)[0]);
189: else
190: fprintf (stream, "%f", *(double *) p);
191: p += 8;
192: break;
193:
194: case 'g':
195: fprintf (stream, "g-float");
196: p += 8;
197: break;
198:
199: case 'h':
200: fprintf (stream, "h-float");
201: p += 16;
202: break;
203:
204: }
205: }
206: else
207: fprintf (stream, "(%s)+", reg_names[regnum]);
208: break;
209:
210: case 11: /* Byte displacement deferred */
211: fputc ('@', stream);
212: case 10: /* Byte displacement */
213: if (regnum == PC_REGNUM)
214: print_address (addr + *p + 2, stream);
215: else
216: fprintf (stream, "%d(%s)", *p, reg_names[regnum]);
217: p += 1;
218: break;
219:
220: case 13: /* Word displacement deferred */
221: fputc ('@', stream);
222: case 12: /* Word displacement */
223: if (regnum == PC_REGNUM)
224: print_address (addr + *(short *)p + 3, stream);
225: else
226: fprintf (stream, "%d(%s)", *(short *)p, reg_names[regnum]);
227: p += 2;
228: break;
229:
230: case 15: /* Long displacement deferred */
231: fputc ('@', stream);
232: case 14: /* Long displacement */
233: if (regnum == PC_REGNUM)
234: print_address (addr + *(long *)p + 5, stream);
235: else
236: fprintf (stream, "%d(%s)", *(long *)p, reg_names[regnum]);
237: p += 4;
238: }
239:
240: return (unsigned char *) p;
241: }
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