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