Commit | Line | Data |
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cb173f45 JK |
1 | /* |
2 | * Ported by the State University of New York at Buffalo by the Distributed | |
3 | * Computer Systems Lab, Department of Computer Science, 1991. | |
4 | */ | |
5 | ||
6 | #include <stdio.h> | |
7 | ||
8 | #include "defs.h" | |
9 | #include "param.h" | |
10 | #include "symtab.h" | |
0c540082 | 11 | #include "tahoe-opcode.h" |
cb173f45 JK |
12 | |
13 | /* Tahoe instructions are never longer than this. */ | |
14 | #define MAXLEN 62 | |
15 | ||
16 | /* Number of elements in the opcode table. */ | |
17 | #define NOPCODES (sizeof votstrs / sizeof votstrs[0]) | |
18 | ||
19 | extern char *reg_names[]; | |
20 | ||
21 | static unsigned char *print_insn_arg (); | |
22 | ||
23 | /* Print the Tahoe instruction at address MEMADDR in debugged memory, | |
24 | on STREAM. Returns length of the instruction, in bytes. */ | |
25 | ||
26 | int | |
27 | print_insn (memaddr, stream) | |
28 | CORE_ADDR memaddr; | |
29 | FILE *stream; | |
30 | { | |
31 | unsigned char buffer[MAXLEN]; | |
32 | register int i; | |
33 | register unsigned char *p; | |
34 | register char *d; | |
35 | ||
36 | read_memory (memaddr, buffer, MAXLEN); | |
37 | ||
38 | for (i = 0; i < NOPCODES; i++) | |
39 | if (votstrs[i].detail.code == buffer[0] | |
40 | || votstrs[i].detail.code == *(unsigned short *)buffer) | |
41 | break; | |
42 | ||
43 | /* Handle undefined instructions. */ | |
44 | if (i == NOPCODES) | |
45 | { | |
46 | fprintf (stream, "0%o", buffer[0]); | |
47 | return 1; | |
48 | } | |
49 | ||
50 | fprintf (stream, "%s", votstrs[i].name); | |
51 | ||
52 | /* Point at first byte of argument data, | |
53 | and at descriptor for first argument. */ | |
54 | p = buffer + 1 + (votstrs[i].detail.code >= 0x100); | |
55 | d = votstrs[i].detail.args; | |
56 | ||
57 | if (*d) | |
58 | fputc ('\t', stream); | |
59 | ||
60 | while (*d) | |
61 | { | |
62 | p = print_insn_arg (d, p, memaddr + (p - buffer), stream); | |
63 | d += 2; | |
64 | if (*d) | |
65 | fprintf (stream, ","); | |
66 | } | |
67 | return p - buffer; | |
68 | } | |
69 | /*******************************************************************/ | |
70 | static unsigned char * | |
71 | print_insn_arg (d, p, addr, stream) | |
72 | char *d; | |
73 | register char *p; | |
74 | CORE_ADDR addr; | |
75 | FILE *stream; | |
76 | { | |
77 | int temp1 = 0; | |
78 | register int regnum = *p & 0xf; | |
79 | float floatlitbuf; | |
80 | ||
81 | if (*d == 'b') | |
82 | { | |
83 | if (d[1] == 'b') | |
84 | fprintf (stream, "0x%x", addr + *p++ + 1); | |
85 | else | |
86 | { | |
87 | ||
88 | temp1 = *p; | |
89 | temp1 <<= 8; | |
90 | temp1 |= *(p + 1); | |
91 | fprintf (stream, "0x%x", addr + temp1 + 2); | |
92 | p += 2; | |
93 | } | |
94 | } | |
95 | else | |
96 | switch ((*p++ >> 4) & 0xf) | |
97 | { | |
98 | case 0: | |
99 | case 1: | |
100 | case 2: | |
101 | case 3: /* Liter>al(short immediate byte) mode */ | |
102 | if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') | |
103 | { | |
104 | *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); | |
105 | fprintf (stream, "$%f", floatlitbuf); | |
106 | } | |
107 | else | |
108 | fprintf (stream, "$%d", p[-1] & 0x3f); | |
109 | break; | |
110 | ||
111 | case 4: /* Indexed */ | |
112 | p = (char *) print_insn_arg (d, p, addr + 1, stream); | |
113 | fprintf (stream, "[%s]", reg_names[regnum]); | |
114 | break; | |
115 | ||
116 | case 5: /* Register */ | |
117 | fprintf (stream, reg_names[regnum]); | |
118 | break; | |
119 | ||
120 | case 7: /* Autodecrement */ | |
121 | fputc ('-', stream); | |
122 | case 6: /* Register deferred */ | |
123 | fprintf (stream, "(%s)", reg_names[regnum]); | |
124 | break; | |
125 | ||
126 | case 9: /* Absolute Address & Autoincrement deferred */ | |
127 | fputc ('*', stream); | |
128 | if (regnum == PC_REGNUM) | |
129 | { | |
130 | temp1 = *p; | |
131 | temp1 <<= 8; | |
132 | temp1 |= *(p +1); | |
133 | ||
134 | fputc ('$', stream); | |
135 | print_address (temp1, stream); | |
136 | p += 4; | |
137 | break; | |
138 | } | |
139 | case 8: /*Immediate & Autoincrement SP */ | |
140 | if (regnum == 8) /*88 is Immediate Byte Mode*/ | |
141 | fprintf (stream, "$%d", *p++); | |
142 | ||
143 | else if (regnum == 9) /*89 is Immediate Word Mode*/ | |
144 | { | |
145 | temp1 = *p; | |
146 | temp1 <<= 8; | |
147 | temp1 |= *(p +1); | |
148 | fprintf (stream, "$%d", temp1); | |
149 | p += 2; | |
150 | } | |
151 | ||
152 | else if (regnum == PC_REGNUM) /*8F is Immediate Long Mode*/ | |
153 | { | |
154 | temp1 = *p; | |
155 | temp1 <<=8; | |
156 | temp1 |= *(p +1); | |
157 | temp1 <<=8; | |
158 | temp1 |= *(p +2); | |
159 | temp1 <<= 8; | |
160 | temp1 |= *(p +3); | |
161 | fprintf (stream, "$%d", temp1); | |
162 | p += 4; | |
163 | } | |
164 | ||
165 | else /*8E is Autoincrement SP Mode*/ | |
166 | fprintf (stream, "(%s)+", reg_names[regnum]); | |
167 | break; | |
168 | ||
169 | case 11: /* Register + Byte Displacement Deferred Mode*/ | |
170 | fputc ('*', stream); | |
171 | case 10: /* Register + Byte Displacement Mode*/ | |
172 | if (regnum == PC_REGNUM) | |
173 | print_address (addr + *p + 2, stream); | |
174 | else | |
175 | fprintf (stream, "%d(%s)", *p, reg_names[regnum]); | |
176 | p += 1; | |
177 | break; | |
178 | ||
179 | case 13: /* Register + Word Displacement Deferred Mode*/ | |
180 | fputc ('*', stream); | |
181 | case 12: /* Register + Word Displacement Mode*/ | |
182 | temp1 = *p; | |
183 | temp1 <<= 8; | |
184 | temp1 |= *(p +1); | |
185 | if (regnum == PC_REGNUM) | |
186 | print_address (addr + temp1 + 3, stream); | |
187 | else | |
188 | fprintf (stream, "%d(%s)", temp1, reg_names[regnum]); | |
189 | p += 2; | |
190 | break; | |
191 | ||
192 | case 15: /* Register + Long Displacement Deferred Mode*/ | |
193 | fputc ('*', stream); | |
194 | case 14: /* Register + Long Displacement Mode*/ | |
195 | temp1 = *p; | |
196 | temp1 <<= 8; | |
197 | temp1 |= *(p +1); | |
198 | temp1 <<= 8; | |
199 | temp1 |= *(p +2); | |
200 | temp1 <<= 8; | |
201 | temp1 |= *(p +3); | |
202 | if (regnum == PC_REGNUM) | |
203 | print_address (addr + temp1 + 5, stream); | |
204 | else | |
205 | fprintf (stream, "%d(%s)", temp1, reg_names[regnum]); | |
206 | p += 4; | |
207 | } | |
208 | ||
209 | return (unsigned char *) p; | |
210 | } | |
211 | ||
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