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
init_spu_disassemble(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 *
get_index_for_opcode(unsigned int insn)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
print_insn_spu(unsigned long insn,unsigned long memaddr)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