opcodes/arc-ext.c

   1 /* ARC target-dependent stuff. Extension structure access functions
   2    Copyright (C) 1995, 1997, 2000 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include "bfd.h"
  23 #include "arc-ext.h"
  24 #include "libiberty.h"
  25
  26 /* Extension structure  */
  27 static struct arcExtMap arc_extension_map;
  28
  29 /* Get the name of an extension instruction.  */
  30
  31 const char *
  32 arcExtMap_instName(int opcode, int minor, int *flags)
  33 {
  34     if (opcode == 3)
  35       {
  36         /* FIXME: ??? need to also check 0/1/2 in bit0 for (3f) brk/sleep/swi  */
  37         if (minor < 0x09 || minor == 0x3f)
  38           return 0;
  39         else
  40           opcode = 0x1f - 0x10 + minor - 0x09 + 1;
  41       }
  42     else
  43       if (opcode < 0x10)
  44         return 0;
  45     else
  46       opcode -= 0x10;
  47     if (!arc_extension_map.instructions[opcode])
  48       return 0;
  49     *flags = arc_extension_map.instructions[opcode]->flags;
  50     return arc_extension_map.instructions[opcode]->name;
  51 }
  52
  53 /* Get the name of an extension core register.  */
  54
  55 const char *
  56 arcExtMap_coreRegName(int value)
  57 {
  58   if (value < 32)
  59     return 0;
  60   return (const char *) arc_extension_map.coreRegisters[value-32];
  61 }
  62
  63 /* Get the name of an extension condition code.  */
  64
  65 const char *
  66 arcExtMap_condCodeName(int value)
  67 {
  68   if (value < 16)
  69     return 0;
  70   return (const char *) arc_extension_map.condCodes[value-16];
  71 }
  72
  73 /* Get the name of an extension aux register.  */
  74
  75 const char *
  76 arcExtMap_auxRegName(long address)
  77 {
  78   /* walk the list of aux reg names and find the name  */
  79   struct ExtAuxRegister *r;
  80
  81   for (r = arc_extension_map.auxRegisters; r; r = r->next) {
  82     if (r->address == address)
  83       return (const char *) r->name;
  84   }
  85   return 0;
  86 }
  87
  88 /* Recursively free auxilliary register strcture pointers until
  89    the list is empty.  */
  90
  91 static void
  92 clean_aux_registers(struct ExtAuxRegister *r)
  93 {
  94   if (r -> next)
  95     {
  96       clean_aux_registers( r->next);
  97       free(r -> name);
  98       free(r -> next);
  99       r ->next = NULL;
 100     }
 101   else
 102     free(r -> name);
 103 }
 104
 105 /* Free memory that has been allocated for the extensions.  */
 106
 107 static void
 108 cleanup_ext_map(void)
 109 {
 110   struct ExtAuxRegister *r;
 111   struct ExtInstruction *insn;
 112   int i;
 113
 114   /* clean aux reg structure  */
 115   r = arc_extension_map.auxRegisters;
 116   if (r)
 117     {
 118       (clean_aux_registers(r));
 119       free(r);
 120     }
 121
 122   /* clean instructions  */
 123   for (i = 0; i < NUM_EXT_INST; i++)
 124     {
 125       insn = arc_extension_map.instructions[i];
 126       if (insn)
 127         free(insn->name);
 128     }
 129
 130   /* clean core reg struct  */
 131   for (i = 0; i < NUM_EXT_CORE; i++)
 132     {
 133       if (arc_extension_map.coreRegisters[i])
 134         free(arc_extension_map.coreRegisters[i]);
 135     }
 136
 137   for (i = 0; i < NUM_EXT_COND; i++) {
 138     if (arc_extension_map.condCodes[i])
 139       free(arc_extension_map.condCodes[i]);
 140   }
 141
 142   memset(&arc_extension_map, 0, sizeof(struct arcExtMap));
 143 }
 144
 145 int
 146 arcExtMap_add(void *base, unsigned long length)
 147 {
 148   unsigned char *block = base;
 149   unsigned char *p = block;
 150
 151   /* Clean up and reset everything if needed.  */
 152   cleanup_ext_map();
 153
 154   while (p && p < (block + length))
 155     {
 156       /* p[0] == length of record
 157          p[1] == type of record
 158          For instructions:
 159            p[2]  = opcode
 160            p[3]  = minor opcode (if opcode == 3)
 161            p[4]  = flags
 162            p[5]+ = name
 163          For core regs and condition codes:
 164            p[2]  = value
 165            p[3]+ = name
 166          For aux regs:
 167            p[2..5] = value
 168            p[6]+   = name
 169          (value is p[2]<<24|p[3]<<16|p[4]<<8|p[5])  */
 170
 171       if (p[0] == 0)
 172         return -1;
 173
 174       switch (p[1])
 175         {
 176         case EXT_INSTRUCTION:
 177           {
 178             char opcode = p[2];
 179             char minor  = p[3];
 180             char * insn_name = (char *) xmalloc(( (int)*p-5) * sizeof(char));
 181             struct ExtInstruction * insn =
 182               (struct ExtInstruction *) xmalloc(sizeof(struct ExtInstruction));
 183
 184             if (opcode==3)
 185               opcode = 0x1f - 0x10 + minor - 0x09 + 1;
 186             else
 187               opcode -= 0x10;
 188             insn -> flags = (char) *(p+4);
 189             strcpy(insn_name, (p+5));
 190             insn -> name = insn_name;
 191             arc_extension_map.instructions[(int) opcode] = insn;
 192           }
 193           break;
 194
 195         case EXT_CORE_REGISTER:
 196           {
 197             char * core_name = (char *) xmalloc(((int)*p-3) * sizeof(char));
 198
 199             strcpy(core_name, (p+3));
 200             arc_extension_map.coreRegisters[p[2]-32] = core_name;
 201           }
 202           break;
 203
 204         case EXT_COND_CODE:
 205           {
 206             char * cc_name = (char *) xmalloc( ((int)*p-3) * sizeof(char));
 207             strcpy(cc_name, (p+3));
 208             arc_extension_map.condCodes[p[2]-16] = cc_name;
 209           }
 210           break;
 211
 212         case EXT_AUX_REGISTER:
 213           {
 214             /* trickier -- need to store linked list to these  */
 215             struct ExtAuxRegister *newAuxRegister =
 216               (struct ExtAuxRegister *)malloc(sizeof(struct ExtAuxRegister));
 217             char * aux_name = (char *) xmalloc ( ((int)*p-6) * sizeof(char));
 218
 219             strcpy (aux_name, (p+6));
 220             newAuxRegister->name = aux_name;
 221             newAuxRegister->address = p[2]<<24 | p[3]<<16 | p[4]<<8  | p[5];
 222             newAuxRegister->next = arc_extension_map.auxRegisters;
 223             arc_extension_map.auxRegisters = newAuxRegister;
 224           }
 225           break;
 226
 227         default:
 228           return -1;
 229
 230         }
 231       p += p[0]; /* move to next record  */
 232     }
 233
 234   return 0;
 235 }
 236
 237 /* Load hw extension descibed in .extArcMap ELF section.  */
 238
 239 void
 240 build_ARC_extmap (text_bfd)
 241   bfd *text_bfd;
 242 {
 243   char *arcExtMap;
 244   bfd_size_type count;
 245   asection *p;
 246
 247   for (p = text_bfd->sections; p != NULL; p = p->next)
 248     if (!strcmp (p->name, ".arcextmap"))
 249       {
 250         count = p->_raw_size;
 251         arcExtMap = (char *) xmalloc (count);
 252         if (bfd_get_section_contents (text_bfd, p, (PTR) arcExtMap, 0, count))
 253           {
 254             arcExtMap_add ((PTR) arcExtMap, count);
 255             break;
 256           }
 257         free ((PTR) arcExtMap);
 258       }
 259 }