opcodes/arc-ext.c

   1 /* ARC target-dependent stuff. Extension structure access functions
   2    Copyright 1995, 1997, 2000, 2001, 2004 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 "sysdep.h"
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include "bfd.h"
  24 #include "arc-ext.h"
  25 #include "libiberty.h"
  26
  27 /* Extension structure  */
  28 static struct arcExtMap arc_extension_map;
  29
  30 /* Get the name of an extension instruction.  */
  31
  32 const char *
  33 arcExtMap_instName(int opcode, int minor, int *flags)
  34 {
  35     if (opcode == 3)
  36       {
  37         /* FIXME: ??? need to also check 0/1/2 in bit0 for (3f) brk/sleep/swi  */
  38         if (minor < 0x09 || minor == 0x3f)
  39           return 0;
  40         else
  41           opcode = 0x1f - 0x10 + minor - 0x09 + 1;
  42       }
  43     else
  44       if (opcode < 0x10)
  45         return 0;
  46     else
  47       opcode -= 0x10;
  48     if (!arc_extension_map.instructions[opcode])
  49       return 0;
  50     *flags = arc_extension_map.instructions[opcode]->flags;
  51     return arc_extension_map.instructions[opcode]->name;
  52 }
  53
  54 /* Get the name of an extension core register.  */
  55
  56 const char *
  57 arcExtMap_coreRegName(int value)
  58 {
  59   if (value < 32)
  60     return 0;
  61   return (const char *) arc_extension_map.coreRegisters[value-32];
  62 }
  63
  64 /* Get the name of an extension condition code.  */
  65
  66 const char *
  67 arcExtMap_condCodeName(int value)
  68 {
  69   if (value < 16)
  70     return 0;
  71   return (const char *) arc_extension_map.condCodes[value-16];
  72 }
  73
  74 /* Get the name of an extension aux register.  */
  75
  76 const char *
  77 arcExtMap_auxRegName(long address)
  78 {
  79   /* walk the list of aux reg names and find the name  */
  80   struct ExtAuxRegister *r;
  81
  82   for (r = arc_extension_map.auxRegisters; r; r = r->next) {
  83     if (r->address == address)
  84       return (const char *) r->name;
  85   }
  86   return 0;
  87 }
  88
  89 /* Recursively free auxilliary register strcture pointers until
  90    the list is empty.  */
  91
  92 static void
  93 clean_aux_registers(struct ExtAuxRegister *r)
  94 {
  95   if (r -> next)
  96     {
  97       clean_aux_registers( r->next);
  98       free(r -> name);
  99       free(r -> next);
 100       r ->next = NULL;
 101     }
 102   else
 103     free(r -> name);
 104 }
 105
 106 /* Free memory that has been allocated for the extensions.  */
 107
 108 static void
 109 cleanup_ext_map(void)
 110 {
 111   struct ExtAuxRegister *r;
 112   struct ExtInstruction *insn;
 113   int i;
 114
 115   /* clean aux reg structure  */
 116   r = arc_extension_map.auxRegisters;
 117   if (r)
 118     {
 119       (clean_aux_registers(r));
 120       free(r);
 121     }
 122
 123   /* clean instructions  */
 124   for (i = 0; i < NUM_EXT_INST; i++)
 125     {
 126       insn = arc_extension_map.instructions[i];
 127       if (insn)
 128         free(insn->name);
 129     }
 130
 131   /* clean core reg struct  */
 132   for (i = 0; i < NUM_EXT_CORE; i++)
 133     {
 134       if (arc_extension_map.coreRegisters[i])
 135         free(arc_extension_map.coreRegisters[i]);
 136     }
 137
 138   for (i = 0; i < NUM_EXT_COND; i++) {
 139     if (arc_extension_map.condCodes[i])
 140       free(arc_extension_map.condCodes[i]);
 141   }
 142
 143   memset(&arc_extension_map, 0, sizeof(struct arcExtMap));
 144 }
 145
 146 int
 147 arcExtMap_add(void *base, unsigned long length)
 148 {
 149   unsigned char *block = base;
 150   unsigned char *p = block;
 151
 152   /* Clean up and reset everything if needed.  */
 153   cleanup_ext_map();
 154
 155   while (p && p < (block + length))
 156     {
 157       /* p[0] == length of record
 158          p[1] == type of record
 159          For instructions:
 160            p[2]  = opcode
 161            p[3]  = minor opcode (if opcode == 3)
 162            p[4]  = flags
 163            p[5]+ = name
 164          For core regs and condition codes:
 165            p[2]  = value
 166            p[3]+ = name
 167          For aux regs:
 168            p[2..5] = value
 169            p[6]+   = name
 170          (value is p[2]<<24|p[3]<<16|p[4]<<8|p[5])  */
 171
 172       if (p[0] == 0)
 173         return -1;
 174
 175       switch (p[1])
 176         {
 177         case EXT_INSTRUCTION:
 178           {
 179             char opcode = p[2];
 180             char minor  = p[3];
 181             char * insn_name = (char *) xmalloc(( (int)*p-5) * sizeof(char));
 182             struct ExtInstruction * insn =
 183               (struct ExtInstruction *) xmalloc(sizeof(struct ExtInstruction));
 184
 185             if (opcode==3)
 186               opcode = 0x1f - 0x10 + minor - 0x09 + 1;
 187             else
 188               opcode -= 0x10;
 189             insn -> flags = (char) *(p+4);
 190             strcpy(insn_name, (p+5));
 191             insn -> name = insn_name;
 192             arc_extension_map.instructions[(int) opcode] = insn;
 193           }
 194           break;
 195
 196         case EXT_CORE_REGISTER:
 197           {
 198             char * core_name = (char *) xmalloc(((int)*p-3) * sizeof(char));
 199
 200             strcpy(core_name, (p+3));
 201             arc_extension_map.coreRegisters[p[2]-32] = core_name;
 202           }
 203           break;
 204
 205         case EXT_COND_CODE:
 206           {
 207             char * cc_name = (char *) xmalloc( ((int)*p-3) * sizeof(char));
 208             strcpy(cc_name, (p+3));
 209             arc_extension_map.condCodes[p[2]-16] = cc_name;
 210           }
 211           break;
 212
 213         case EXT_AUX_REGISTER:
 214           {
 215             /* trickier -- need to store linked list to these  */
 216             struct ExtAuxRegister *newAuxRegister =
 217               (struct ExtAuxRegister *)malloc(sizeof(struct ExtAuxRegister));
 218             char * aux_name = (char *) xmalloc ( ((int)*p-6) * sizeof(char));
 219
 220             strcpy (aux_name, (p+6));
 221             newAuxRegister->name = aux_name;
 222             newAuxRegister->address = p[2]<<24 | p[3]<<16 | p[4]<<8  | p[5];
 223             newAuxRegister->next = arc_extension_map.auxRegisters;
 224             arc_extension_map.auxRegisters = newAuxRegister;
 225           }
 226           break;
 227
 228         default:
 229           return -1;
 230
 231         }
 232       p += p[0]; /* move to next record  */
 233     }
 234
 235   return 0;
 236 }
 237
 238 /* Load hw extension descibed in .extArcMap ELF section.  */
 239
 240 void
 241 build_ARC_extmap (text_bfd)
 242   bfd *text_bfd;
 243 {
 244   char *arcExtMap;
 245   bfd_size_type count;
 246   asection *p;
 247
 248   for (p = text_bfd->sections; p != NULL; p = p->next)
 249     if (!strcmp (p->name, ".arcextmap"))
 250       {
 251         count = bfd_get_section_size (p);
 252         arcExtMap = (char *) xmalloc (count);
 253         if (bfd_get_section_contents (text_bfd, p, (PTR) arcExtMap, 0, count))
 254           {
 255             arcExtMap_add ((PTR) arcExtMap, count);
 256             break;
 257           }
 258         free ((PTR) arcExtMap);
 259       }
 260 }