opcodes/pru-dis.c

   1 /* TI PRU disassemble routines
   2    Copyright (C) 2014-2019 Free Software Foundation, Inc.
   3    Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
   4
   5    This file is part of the GNU opcodes library.
   6
   7    This library 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 3, or (at your option)
  10    any later version.
  11
  12    It is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this file; see the file COPYING.  If not, write to the
  19    Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "disassemble.h"
  24 #include "opcode/pru.h"
  25 #include "libiberty.h"
  26 #include <string.h>
  27 #include <assert.h>
  28
  29 /* No symbol table is available when this code runs out in an embedded
  30    system as when it is used for disassembler support in a monitor.  */
  31 #if !defined (EMBEDDED_ENV)
  32 #define SYMTAB_AVAILABLE 1
  33 #include "elf-bfd.h"
  34 #include "elf/pru.h"
  35 #endif
  36
  37 /* Length of PRU instruction in bytes.  */
  38 #define INSNLEN 4
  39
  40 /* Return a pointer to an pru_opcode struct for a given instruction
  41    opcode, or NULL if there is an error.  */
  42 const struct pru_opcode *
  43 pru_find_opcode (unsigned long opcode)
  44 {
  45   const struct pru_opcode *p;
  46   const struct pru_opcode *op = NULL;
  47   const struct pru_opcode *pseudo_op = NULL;
  48
  49   for (p = pru_opcodes; p < &pru_opcodes[NUMOPCODES]; p++)
  50     {
  51       if ((p->mask & opcode) == p->match)
  52         {
  53           if ((p->pinfo & PRU_INSN_MACRO) == PRU_INSN_MACRO)
  54             pseudo_op = p;
  55           else if ((p->pinfo & PRU_INSN_LDI32) == PRU_INSN_LDI32)
  56             /* ignore - should be caught with regular patterns */;
  57           else
  58             op = p;
  59         }
  60     }
  61
  62   return pseudo_op ? pseudo_op : op;
  63 }
  64
  65 /* There are 32 regular registers, each with 8 possible subfield selectors.  */
  66 #define NUMREGNAMES (32 * 8)
  67
  68 static void
  69 pru_print_insn_arg_reg (unsigned int r, unsigned int sel,
  70                         disassemble_info *info)
  71 {
  72   unsigned int i = r * RSEL_NUM_ITEMS + sel;
  73   assert (i < (unsigned int)pru_num_regs);
  74   assert (i < NUMREGNAMES);
  75   (*info->fprintf_func) (info->stream, "%s", pru_regs[i].name);
  76 }
  77
  78 /* The function pru_print_insn_arg uses the character pointed
  79    to by ARGPTR to determine how it print the next token or separator
  80    character in the arguments to an instruction.  */
  81 static int
  82 pru_print_insn_arg (const char *argptr,
  83                       unsigned long opcode, bfd_vma address,
  84                       disassemble_info *info)
  85 {
  86   long offs = 0;
  87   unsigned long i = 0;
  88   unsigned long io = 0;
  89
  90   switch (*argptr)
  91     {
  92     case ',':
  93       (*info->fprintf_func) (info->stream, "%c ", *argptr);
  94       break;
  95     case 'd':
  96       pru_print_insn_arg_reg (GET_INSN_FIELD (RD, opcode),
  97                               GET_INSN_FIELD (RDSEL, opcode),
  98                               info);
  99       break;
 100     case 'D':
 101       /* The first 4 values for RDB and RSEL are the same, so we
 102          can reuse some code.  */
 103       pru_print_insn_arg_reg (GET_INSN_FIELD (RD, opcode),
 104                               GET_INSN_FIELD (RDB, opcode),
 105                               info);
 106       break;
 107     case 's':
 108       pru_print_insn_arg_reg (GET_INSN_FIELD (RS1, opcode),
 109                               GET_INSN_FIELD (RS1SEL, opcode),
 110                               info);
 111       break;
 112     case 'S':
 113       pru_print_insn_arg_reg (GET_INSN_FIELD (RS1, opcode),
 114                               RSEL_31_0,
 115                               info);
 116       break;
 117     case 'b':
 118       io = GET_INSN_FIELD (IO, opcode);
 119
 120       if (io)
 121         {
 122           i = GET_INSN_FIELD (IMM8, opcode);
 123           (*info->fprintf_func) (info->stream, "%ld", i);
 124         }
 125       else
 126         {
 127         pru_print_insn_arg_reg (GET_INSN_FIELD (RS2, opcode),
 128                                 GET_INSN_FIELD (RS2SEL, opcode),
 129                                 info);
 130         }
 131       break;
 132     case 'B':
 133       io = GET_INSN_FIELD (IO, opcode);
 134
 135       if (io)
 136         {
 137           i = GET_INSN_FIELD (IMM8, opcode) + 1;
 138           (*info->fprintf_func) (info->stream, "%ld", i);
 139         }
 140       else
 141         {
 142         pru_print_insn_arg_reg (GET_INSN_FIELD (RS2, opcode),
 143                                 GET_INSN_FIELD (RS2SEL, opcode),
 144                                 info);
 145         }
 146       break;
 147     case 'j':
 148       io = GET_INSN_FIELD (IO, opcode);
 149
 150       if (io)
 151         {
 152           /* For the sake of pretty-printing, dump text addresses with
 153              their "virtual" offset that we use for distinguishing
 154              PMEM vs DMEM. This is needed for printing the correct text
 155              labels.  */
 156           bfd_vma text_offset = address & ~0x3fffff;
 157           i = GET_INSN_FIELD (IMM16, opcode) * 4;
 158           (*info->print_address_func) (i + text_offset, info);
 159         }
 160       else
 161         {
 162           pru_print_insn_arg_reg (GET_INSN_FIELD (RS2, opcode),
 163                                 GET_INSN_FIELD (RS2SEL, opcode),
 164                                 info);
 165         }
 166       break;
 167     case 'W':
 168       i = GET_INSN_FIELD (IMM16, opcode);
 169       (*info->fprintf_func) (info->stream, "%ld", i);
 170       break;
 171     case 'o':
 172       offs = GET_BROFF_SIGNED (opcode) * 4;
 173       (*info->print_address_func) (address + offs, info);
 174       break;
 175     case 'O':
 176       offs = GET_INSN_FIELD (LOOP_JMPOFFS, opcode) * 4;
 177       (*info->print_address_func) (address + offs, info);
 178       break;
 179     case 'l':
 180       i = GET_BURSTLEN (opcode);
 181       if (i < LSSBBO_BYTECOUNT_R0_BITS7_0)
 182         (*info->fprintf_func) (info->stream, "%ld", i + 1);
 183       else
 184         {
 185           i -= LSSBBO_BYTECOUNT_R0_BITS7_0;
 186           (*info->fprintf_func) (info->stream, "r0.b%ld", i);
 187         }
 188       break;
 189     case 'n':
 190       i = GET_INSN_FIELD (XFR_LENGTH, opcode);
 191       if (i < LSSBBO_BYTECOUNT_R0_BITS7_0)
 192         (*info->fprintf_func) (info->stream, "%ld", i + 1);
 193       else
 194         {
 195           i -= LSSBBO_BYTECOUNT_R0_BITS7_0;
 196           (*info->fprintf_func) (info->stream, "r0.b%ld", i);
 197         }
 198       break;
 199     case 'c':
 200       i = GET_INSN_FIELD (CB, opcode);
 201       (*info->fprintf_func) (info->stream, "%ld", i);
 202       break;
 203     case 'w':
 204       i = GET_INSN_FIELD (WAKEONSTATUS, opcode);
 205       (*info->fprintf_func) (info->stream, "%ld", i);
 206       break;
 207     case 'x':
 208       i = GET_INSN_FIELD (XFR_WBA, opcode);
 209       (*info->fprintf_func) (info->stream, "%ld", i);
 210       break;
 211     default:
 212       (*info->fprintf_func) (info->stream, "unknown");
 213       break;
 214     }
 215   return 0;
 216 }
 217
 218 /* pru_disassemble does all the work of disassembling a PRU
 219    instruction opcode.  */
 220 static int
 221 pru_disassemble (bfd_vma address, unsigned long opcode,
 222                    disassemble_info *info)
 223 {
 224   const struct pru_opcode *op;
 225
 226   info->bytes_per_line = INSNLEN;
 227   info->bytes_per_chunk = INSNLEN;
 228   info->display_endian = info->endian;
 229   info->insn_info_valid = 1;
 230   info->branch_delay_insns = 0;
 231   info->data_size = 0;
 232   info->insn_type = dis_nonbranch;
 233   info->target = 0;
 234   info->target2 = 0;
 235
 236   /* Find the major opcode and use this to disassemble
 237      the instruction and its arguments.  */
 238   op = pru_find_opcode (opcode);
 239
 240   if (op != NULL)
 241     {
 242       (*info->fprintf_func) (info->stream, "%s", op->name);
 243
 244       const char *argstr = op->args;
 245       if (argstr != NULL && *argstr != '\0')
 246         {
 247           (*info->fprintf_func) (info->stream, "\t");
 248           while (*argstr != '\0')
 249             {
 250               pru_print_insn_arg (argstr, opcode, address, info);
 251               ++argstr;
 252             }
 253         }
 254     }
 255   else
 256     {
 257       /* Handle undefined instructions.  */
 258       info->insn_type = dis_noninsn;
 259       (*info->fprintf_func) (info->stream, "0x%lx", opcode);
 260     }
 261   /* Tell the caller how far to advance the program counter.  */
 262   return INSNLEN;
 263 }
 264
 265
 266 /* print_insn_pru is the main disassemble function for PRU.  */
 267 int
 268 print_insn_pru (bfd_vma address, disassemble_info *info)
 269 {
 270   bfd_byte buffer[INSNLEN];
 271   int status;
 272
 273   status = (*info->read_memory_func) (address, buffer, INSNLEN, info);
 274   if (status == 0)
 275     {
 276       unsigned long insn;
 277       insn = (unsigned long) bfd_getl32 (buffer);
 278       status = pru_disassemble (address, insn, info);
 279     }
 280   else
 281     {
 282       (*info->memory_error_func) (status, address, info);
 283       status = -1;
 284     }
 285   return status;
 286 }