1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Disassemble SPU instructions
3
4 Copyright 2006 Free Software Foundation, Inc.
5
6 This file is part of GDB, GAS, and the GNU binutils.
7
8 */
9
10 #include <linux/string.h>
11 #include "nonstdio.h"
12 #include "ansidecl.h"
13 #include "spu.h"
14 #include "dis-asm.h"
15
16 /* This file provides a disassembler function which uses
17 the disassembler interface defined in dis-asm.h. */
18
19 extern const struct spu_opcode spu_opcodes[];
20 extern const int spu_num_opcodes;
21
22 #define SPU_DISASM_TBL_SIZE (1 << 11)
23 static const struct spu_opcode *spu_disassemble_table[SPU_DISASM_TBL_SIZE];
24
25 static void
26 init_spu_disassemble (void)
27 {
28 int i;
29
30 /* If two instructions have the same opcode then we prefer the first
31 * one. In most cases it is just an alternate mnemonic. */
32 for (i = 0; i < spu_num_opcodes; i++)
33 {
34 int o = spu_opcodes[i].opcode;
35 if (o >= SPU_DISASM_TBL_SIZE)
36 continue; /* abort (); */
37 if (spu_disassemble_table[o] == 0)
38 spu_disassemble_table[o] = &spu_opcodes[i];
39 }
40 }
41
42 /* Determine the instruction from the 10 least significant bits. */
43 static const struct spu_opcode *
44 get_index_for_opcode (unsigned int insn)
45 {
46 const struct spu_opcode *index;
47 unsigned int opcode = insn >> (32-11);
48
49 /* Init the table. This assumes that element 0/opcode 0 (currently
50 * NOP) is always used */
51 if (spu_disassemble_table[0] == 0)
52 init_spu_disassemble ();
53
54 if ((index = spu_disassemble_table[opcode & 0x780]) != 0
55 && index->insn_type == RRR)
56 return index;
57
58 if ((index = spu_disassemble_table[opcode & 0x7f0]) != 0
59 && (index->insn_type == RI18 || index->insn_type == LBT))
60 return index;
61
62 if ((index = spu_disassemble_table[opcode & 0x7f8]) != 0
63 && index->insn_type == RI10)
64 return index;
65
66 if ((index = spu_disassemble_table[opcode & 0x7fc]) != 0
67 && (index->insn_type == RI16))
68 return index;
69
70 if ((index = spu_disassemble_table[opcode & 0x7fe]) != 0
71 && (index->insn_type == RI8))
72 return index;
73
74 if ((index = spu_disassemble_table[opcode & 0x7ff]) != 0)
75 return index;
76
77 return NULL;
78 }
79
80 /* Print a Spu instruction. */
81
82 int
83 print_insn_spu (unsigned long insn, unsigned long memaddr)
84 {
85 int value;
86 int hex_value;
87 const struct spu_opcode *index;
88 enum spu_insns tag;
89
90 index = get_index_for_opcode (insn);
91
92 if (index == 0)
93 {
94 printf(".long 0x%lx", insn);
95 }
96 else
97 {
98 int i;
99 int paren = 0;
100 tag = (enum spu_insns)(index - spu_opcodes);
101 printf("%s", index->mnemonic);
102 if (tag == M_BI || tag == M_BISL || tag == M_IRET || tag == M_BISLED
103 || tag == M_BIHNZ || tag == M_BIHZ || tag == M_BINZ || tag == M_BIZ
104 || tag == M_SYNC || tag == M_HBR)
105 {
106 int fb = (insn >> (32-18)) & 0x7f;
107 if (fb & 0x40)
108 printf(tag == M_SYNC ? "c" : "p");
109 if (fb & 0x20)
110 printf("d");
111 if (fb & 0x10)
112 printf("e");
113 }
114 if (index->arg[0] != 0)
115 printf("\t");
116 hex_value = 0;
117 for (i = 1; i <= index->arg[0]; i++)
118 {
119 int arg = index->arg[i];
120 if (arg != A_P && !paren && i > 1)
121 printf(",");
122
123 switch (arg)
124 {
125 case A_T:
126 printf("$%lu",
127 DECODE_INSN_RT (insn));
128 break;
129 case A_A:
130 printf("$%lu",
131 DECODE_INSN_RA (insn));
132 break;
133 case A_B:
134 printf("$%lu",
135 DECODE_INSN_RB (insn));
136 break;
137 case A_C:
138 printf("$%lu",
139 DECODE_INSN_RC (insn));
140 break;
141 case A_S:
142 printf("$sp%lu",
143 DECODE_INSN_RA (insn));
144 break;
145 case A_H:
146 printf("$ch%lu",
147 DECODE_INSN_RA (insn));
148 break;
149 case A_P:
150 paren++;
151 printf("(");
152 break;
153 case A_U7A:
154 printf("%lu",
155 173 - DECODE_INSN_U8 (insn));
156 break;
157 case A_U7B:
158 printf("%lu",
159 155 - DECODE_INSN_U8 (insn));
160 break;
161 case A_S3:
162 case A_S6:
163 case A_S7:
164 case A_S7N:
165 case A_U3:
166 case A_U5:
167 case A_U6:
168 case A_U7:
169 hex_value = DECODE_INSN_I7 (insn);
170 printf("%d", hex_value);
171 break;
172 case A_S11:
173 print_address(memaddr + DECODE_INSN_I9a (insn) * 4);
174 break;
175 case A_S11I:
176 print_address(memaddr + DECODE_INSN_I9b (insn) * 4);
177 break;
178 case A_S10:
179 case A_S10B:
180 hex_value = DECODE_INSN_I10 (insn);
181 printf("%d", hex_value);
182 break;
183 case A_S14:
184 hex_value = DECODE_INSN_I10 (insn) * 16;
185 printf("%d", hex_value);
186 break;
187 case A_S16:
188 hex_value = DECODE_INSN_I16 (insn);
189 printf("%d", hex_value);
190 break;
191 case A_X16:
192 hex_value = DECODE_INSN_U16 (insn);
193 printf("%u", hex_value);
194 break;
195 case A_R18:
196 value = DECODE_INSN_I16 (insn) * 4;
197 if (value == 0)
198 printf("%d", value);
199 else
200 {
201 hex_value = memaddr + value;
202 print_address(hex_value & 0x3ffff);
203 }
204 break;
205 case A_S18:
206 value = DECODE_INSN_U16 (insn) * 4;
207 if (value == 0)
208 printf("%d", value);
209 else
210 print_address(value);
211 break;
212 case A_U18:
213 value = DECODE_INSN_U18 (insn);
214 if (value == 0 || 1)
215 {
216 hex_value = value;
217 printf("%u", value);
218 }
219 else
220 print_address(value);
221 break;
222 case A_U14:
223 hex_value = DECODE_INSN_U14 (insn);
224 printf("%u", hex_value);
225 break;
226 }
227 if (arg != A_P && paren)
228 {
229 printf(")");
230 paren--;
231 }
232 }
233 if (hex_value > 16)
234 printf("\t# %x", hex_value);
235 }
236 return 4;
237 }
238
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