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/arch/powerpc/xmon/spu-dis.c

http://github.com/mirrors/linux
C | 237 lines | 201 code | 20 blank | 16 comment | 75 complexity | 8773096cf3d018f03ef72cda68403500 MD5 | raw file
  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
 19extern const struct spu_opcode spu_opcodes[];
 20extern const int spu_num_opcodes;
 21
 22#define SPU_DISASM_TBL_SIZE (1 << 11)
 23static const struct spu_opcode *spu_disassemble_table[SPU_DISASM_TBL_SIZE];
 24
 25static void
 26init_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. */
 43static const struct spu_opcode *
 44get_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
 82int
 83print_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}