1 /* Disassemble SPU instructions
2
3 Copyright 2006 Free Software Foundation, Inc.
4
5 This file is part of GDB, GAS, and the GNU binutils.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
20
21 #include <linux/string.h>
22 #include "nonstdio.h"
23 #include "ansidecl.h"
24 #include "spu.h"
25 #include "dis-asm.h"
26
27 /* This file provides a disassembler function which uses
28 the disassembler interface defined in dis-asm.h. */
29
30 extern const struct spu_opcode spu_opcodes[];
31 extern const int spu_num_opcodes;
32
33 #define SPU_DISASM_TBL_SIZE (1 << 11)
34 static const struct spu_opcode *spu_disassemble_table[SPU_DISASM_TBL_SIZE];
35
36 static void
init_spu_disassemble(void)37 init_spu_disassemble (void)
38 {
39 int i;
40
41 /* If two instructions have the same opcode then we prefer the first
42 * one. In most cases it is just an alternate mnemonic. */
43 for (i = 0; i < spu_num_opcodes; i++)
44 {
45 int o = spu_opcodes[i].opcode;
46 if (o >= SPU_DISASM_TBL_SIZE)
47 continue; /* abort (); */
48 if (spu_disassemble_table[o] == 0)
49 spu_disassemble_table[o] = &spu_opcodes[i];
50 }
51 }
52
53 /* Determine the instruction from the 10 least significant bits. */
54 static const struct spu_opcode *
get_index_for_opcode(unsigned int insn)55 get_index_for_opcode (unsigned int insn)
56 {
57 const struct spu_opcode *index;
58 unsigned int opcode = insn >> (32-11);
59
60 /* Init the table. This assumes that element 0/opcode 0 (currently
61 * NOP) is always used */
62 if (spu_disassemble_table[0] == 0)
63 init_spu_disassemble ();
64
65 if ((index = spu_disassemble_table[opcode & 0x780]) != 0
66 && index->insn_type == RRR)
67 return index;
68
69 if ((index = spu_disassemble_table[opcode & 0x7f0]) != 0
70 && (index->insn_type == RI18 || index->insn_type == LBT))
71 return index;
72
73 if ((index = spu_disassemble_table[opcode & 0x7f8]) != 0
74 && index->insn_type == RI10)
75 return index;
76
77 if ((index = spu_disassemble_table[opcode & 0x7fc]) != 0
78 && (index->insn_type == RI16))
79 return index;
80
81 if ((index = spu_disassemble_table[opcode & 0x7fe]) != 0
82 && (index->insn_type == RI8))
83 return index;
84
85 if ((index = spu_disassemble_table[opcode & 0x7ff]) != 0)
86 return index;
87
88 return NULL;
89 }
90
91 /* Print a Spu instruction. */
92
93 int
print_insn_spu(unsigned long insn,unsigned long memaddr)94 print_insn_spu (unsigned long insn, unsigned long memaddr)
95 {
96 int value;
97 int hex_value;
98 const struct spu_opcode *index;
99 enum spu_insns tag;
100
101 index = get_index_for_opcode (insn);
102
103 if (index == 0)
104 {
105 printf(".long 0x%x", insn);
106 }
107 else
108 {
109 int i;
110 int paren = 0;
111 tag = (enum spu_insns)(index - spu_opcodes);
112 printf("%s", index->mnemonic);
113 if (tag == M_BI || tag == M_BISL || tag == M_IRET || tag == M_BISLED
114 || tag == M_BIHNZ || tag == M_BIHZ || tag == M_BINZ || tag == M_BIZ
115 || tag == M_SYNC || tag == M_HBR)
116 {
117 int fb = (insn >> (32-18)) & 0x7f;
118 if (fb & 0x40)
119 printf(tag == M_SYNC ? "c" : "p");
120 if (fb & 0x20)
121 printf("d");
122 if (fb & 0x10)
123 printf("e");
124 }
125 if (index->arg[0] != 0)
126 printf("\t");
127 hex_value = 0;
128 for (i = 1; i <= index->arg[0]; i++)
129 {
130 int arg = index->arg[i];
131 if (arg != A_P && !paren && i > 1)
132 printf(",");
133
134 switch (arg)
135 {
136 case A_T:
137 printf("$%d",
138 DECODE_INSN_RT (insn));
139 break;
140 case A_A:
141 printf("$%d",
142 DECODE_INSN_RA (insn));
143 break;
144 case A_B:
145 printf("$%d",
146 DECODE_INSN_RB (insn));
147 break;
148 case A_C:
149 printf("$%d",
150 DECODE_INSN_RC (insn));
151 break;
152 case A_S:
153 printf("$sp%d",
154 DECODE_INSN_RA (insn));
155 break;
156 case A_H:
157 printf("$ch%d",
158 DECODE_INSN_RA (insn));
159 break;
160 case A_P:
161 paren++;
162 printf("(");
163 break;
164 case A_U7A:
165 printf("%d",
166 173 - DECODE_INSN_U8 (insn));
167 break;
168 case A_U7B:
169 printf("%d",
170 155 - DECODE_INSN_U8 (insn));
171 break;
172 case A_S3:
173 case A_S6:
174 case A_S7:
175 case A_S7N:
176 case A_U3:
177 case A_U5:
178 case A_U6:
179 case A_U7:
180 hex_value = DECODE_INSN_I7 (insn);
181 printf("%d", hex_value);
182 break;
183 case A_S11:
184 print_address(memaddr + DECODE_INSN_I9a (insn) * 4);
185 break;
186 case A_S11I:
187 print_address(memaddr + DECODE_INSN_I9b (insn) * 4);
188 break;
189 case A_S10:
190 case A_S10B:
191 hex_value = DECODE_INSN_I10 (insn);
192 printf("%d", hex_value);
193 break;
194 case A_S14:
195 hex_value = DECODE_INSN_I10 (insn) * 16;
196 printf("%d", hex_value);
197 break;
198 case A_S16:
199 hex_value = DECODE_INSN_I16 (insn);
200 printf("%d", hex_value);
201 break;
202 case A_X16:
203 hex_value = DECODE_INSN_U16 (insn);
204 printf("%u", hex_value);
205 break;
206 case A_R18:
207 value = DECODE_INSN_I16 (insn) * 4;
208 if (value == 0)
209 printf("%d", value);
210 else
211 {
212 hex_value = memaddr + value;
213 print_address(hex_value & 0x3ffff);
214 }
215 break;
216 case A_S18:
217 value = DECODE_INSN_U16 (insn) * 4;
218 if (value == 0)
219 printf("%d", value);
220 else
221 print_address(value);
222 break;
223 case A_U18:
224 value = DECODE_INSN_U18 (insn);
225 if (value == 0 || 1)
226 {
227 hex_value = value;
228 printf("%u", value);
229 }
230 else
231 print_address(value);
232 break;
233 case A_U14:
234 hex_value = DECODE_INSN_U14 (insn);
235 printf("%u", hex_value);
236 break;
237 }
238 if (arg != A_P && paren)
239 {
240 printf(")");
241 paren--;
242 }
243 }
244 if (hex_value > 16)
245 printf("\t# %x", hex_value);
246 }
247 return 4;
248 }
249