gprof/tahoe.c

   1 /*
   2  * Copyright (c) 1983, 1993, 2001
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 #include "gprof.h"
  30 #include "search_list.h"
  31 #include "source.h"
  32 #include "symtab.h"
  33 #include "cg_arcs.h"
  34 #include "corefile.h"
  35 #include "hist.h"
  36
  37     /*
  38      *        opcode of the `callf' instruction
  39      */
  40 #define CALLF   0xfe
  41
  42     /*
  43      *        register for pc relative addressing
  44      */
  45 #define PC      0xf
  46
  47 enum tahoe_opermodes
  48   {
  49     literal, indexed, reg, regdef, autodec, autoinc, autoincdef,
  50     bytedisp, bytedispdef, worddisp, worddispdef, longdisp, longdispdef,
  51     immediate, absolute, byterel, bytereldef, wordrel, wordreldef,
  52     longrel, longreldef
  53   };
  54 typedef enum tahoe_opermodes tahoe_operandenum;
  55
  56 /*
  57  * A symbol to be the child of indirect callf:
  58  */
  59 static Sym indirectchild;
  60
  61 static tahoe_operandenum tahoe_operandmode PARAMS ((unsigned char *));
  62 static char *tahoe_operandname PARAMS ((tahoe_operandenum));
  63 static long tahoe_operandlength PARAMS ((unsigned char *));
  64 static bfd_signed_vma tahoe_offset PARAMS ((unsigned char *));
  65 void tahoe_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
  66
  67 static tahoe_operandenum
  68 tahoe_operandmode (modep)
  69      unsigned char *modep;
  70 {
  71   long usesreg = *modep & 0xf;
  72
  73   switch ((*modep >> 4) & 0xf)
  74     {
  75     case 0:
  76     case 1:
  77     case 2:
  78     case 3:
  79       return literal;
  80     case 4:
  81       return indexed;
  82     case 5:
  83       return reg;
  84     case 6:
  85       return regdef;
  86     case 7:
  87       return autodec;
  88     case 8:
  89       return usesreg != 0xe ? autoinc : immediate;
  90     case 9:
  91       return usesreg != PC ? autoincdef : absolute;
  92     case 10:
  93       return usesreg != PC ? bytedisp : byterel;
  94     case 11:
  95       return usesreg != PC ? bytedispdef : bytereldef;
  96     case 12:
  97       return usesreg != PC ? worddisp : wordrel;
  98     case 13:
  99       return usesreg != PC ? worddispdef : wordreldef;
 100     case 14:
 101       return usesreg != PC ? longdisp : longrel;
 102     case 15:
 103       return usesreg != PC ? longdispdef : longreldef;
 104     }
 105   /* NOTREACHED */
 106   abort ();
 107 }
 108
 109 static char *
 110 tahoe_operandname (mode)
 111      tahoe_operandenum mode;
 112 {
 113
 114   switch (mode)
 115     {
 116     case literal:
 117       return "literal";
 118     case indexed:
 119       return "indexed";
 120     case reg:
 121       return "register";
 122     case regdef:
 123       return "register deferred";
 124     case autodec:
 125       return "autodecrement";
 126     case autoinc:
 127       return "autoincrement";
 128     case autoincdef:
 129       return "autoincrement deferred";
 130     case bytedisp:
 131       return "byte displacement";
 132     case bytedispdef:
 133       return "byte displacement deferred";
 134     case byterel:
 135       return "byte relative";
 136     case bytereldef:
 137       return "byte relative deferred";
 138     case worddisp:
 139       return "word displacement";
 140     case worddispdef:
 141       return "word displacement deferred";
 142     case wordrel:
 143       return "word relative";
 144     case wordreldef:
 145       return "word relative deferred";
 146     case immediate:
 147       return "immediate";
 148     case absolute:
 149       return "absolute";
 150     case longdisp:
 151       return "long displacement";
 152     case longdispdef:
 153       return "long displacement deferred";
 154     case longrel:
 155       return "long relative";
 156     case longreldef:
 157       return "long relative deferred";
 158     }
 159   /* NOTREACHED */
 160   abort ();
 161 }
 162
 163 static long
 164 tahoe_operandlength (modep)
 165      unsigned char *modep;
 166 {
 167
 168   switch (tahoe_operandmode (modep))
 169     {
 170     case literal:
 171     case reg:
 172     case regdef:
 173     case autodec:
 174     case autoinc:
 175     case autoincdef:
 176       return 1;
 177     case bytedisp:
 178     case bytedispdef:
 179     case byterel:
 180     case bytereldef:
 181       return 2;
 182     case worddisp:
 183     case worddispdef:
 184     case wordrel:
 185     case wordreldef:
 186       return 3;
 187     case immediate:
 188     case absolute:
 189     case longdisp:
 190     case longdispdef:
 191     case longrel:
 192     case longreldef:
 193       return 5;
 194     case indexed:
 195       return 1 + tahoe_operandlength (modep + 1);
 196     }
 197   /* NOTREACHED */
 198   abort ();
 199 }
 200
 201 static bfd_signed_vma
 202 tahoe_offset (modep)
 203      unsigned char *modep;
 204 {
 205   tahoe_operandenum mode = tahoe_operandmode (modep);
 206
 207   ++modep;                              /* skip over the mode */
 208   switch (mode)
 209     {
 210     default:
 211       fprintf (stderr, "[reladdr] not relative address\n");
 212       return 0;
 213     case byterel:
 214       return 1 + bfd_get_signed_8 (core_bfd, modep);
 215     case wordrel:
 216       return 2 + bfd_get_signed_16 (core_bfd, modep);
 217     case longrel:
 218       return 4 + bfd_get_signed_32 (core_bfd, modep);
 219     }
 220 }
 221
 222 void
 223 tahoe_find_call (parent, p_lowpc, p_highpc)
 224      Sym *parent;
 225      bfd_vma p_lowpc;
 226      bfd_vma p_highpc;
 227 {
 228   unsigned char *instructp;
 229   long length;
 230   Sym *child;
 231   tahoe_operandenum mode;
 232   tahoe_operandenum firstmode;
 233   bfd_vma pc, destpc;
 234   static bfd_boolean inited = FALSE;
 235
 236   if (!inited)
 237     {
 238       inited = TRUE;
 239       sym_init (&indirectchild);
 240       indirectchild.cg.prop.fract = 1.0;
 241       indirectchild.cg.cyc.head = &indirectchild;
 242     }
 243
 244   if (core_text_space == 0)
 245     {
 246       return;
 247     }
 248   if (p_lowpc < s_lowpc)
 249     {
 250       p_lowpc = s_lowpc;
 251     }
 252   if (p_highpc > s_highpc)
 253     {
 254       p_highpc = s_highpc;
 255     }
 256   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
 257                           parent->name, (unsigned long) p_lowpc,
 258                           (unsigned long) p_highpc));
 259   for (pc = p_lowpc; pc < p_highpc; pc += length)
 260     {
 261       length = 1;
 262       instructp = ((unsigned char *) core_text_space
 263                    + pc - core_text_sect->vma);
 264       if ((*instructp & 0xff) == CALLF)
 265         {
 266           /*
 267            *    maybe a callf, better check it out.
 268            *      skip the count of the number of arguments.
 269            */
 270           DBG (CALLDEBUG, printf ("[findcall]\t0x%lx:callf",
 271                                   (unsigned long) pc));
 272           firstmode = tahoe_operandmode (instructp + length);
 273           switch (firstmode)
 274             {
 275             case literal:
 276             case immediate:
 277               break;
 278             default:
 279               goto botched;
 280             }
 281           length += tahoe_operandlength (instructp + length);
 282           mode = tahoe_operandmode (instructp + length);
 283           DBG (CALLDEBUG,
 284                printf ("\tfirst operand is %s", tahoe_operandname (firstmode));
 285                printf ("\tsecond operand is %s\n", tahoe_operandname (mode));
 286             );
 287           switch (mode)
 288             {
 289             case regdef:
 290             case bytedispdef:
 291             case worddispdef:
 292             case longdispdef:
 293             case bytereldef:
 294             case wordreldef:
 295             case longreldef:
 296               /*
 297                *    indirect call: call through pointer
 298                *      either  *d(r)   as a parameter or local
 299                *              (r)     as a return value
 300                *              *f      as a global pointer
 301                *      [are there others that we miss?,
 302                *       e.g. arrays of pointers to functions???]
 303                */
 304               arc_add (parent, &indirectchild, (unsigned long) 0);
 305               length += tahoe_operandlength (instructp + length);
 306               continue;
 307             case byterel:
 308             case wordrel:
 309             case longrel:
 310               /*
 311                *    regular pc relative addressing
 312                *      check that this is the address of
 313                *      a function.
 314                */
 315               destpc = pc + tahoe_offset (instructp + length);
 316               if (destpc >= s_lowpc && destpc <= s_highpc)
 317                 {
 318                   child = sym_lookup (&symtab, destpc);
 319                   DBG (CALLDEBUG,
 320                        printf ("[findcall]\tdestpc 0x%lx",
 321                                (unsigned long) destpc);
 322                        printf (" child->name %s", child->name);
 323                        printf (" child->addr 0x%lx\n",
 324                                (unsigned long) child->addr);
 325                     );
 326                   if (child->addr == destpc)
 327                     {
 328                       /*
 329                        *    a hit
 330                        */
 331                       arc_add (parent, child, (unsigned long) 0);
 332                       length += tahoe_operandlength (instructp + length);
 333                       continue;
 334                     }
 335                   goto botched;
 336                 }
 337               /*
 338                *    else:
 339                *      it looked like a callf,
 340                *      but it wasn't to anywhere.
 341                */
 342               goto botched;
 343             default:
 344             botched:
 345               /*
 346                *    something funny going on.
 347                */
 348               DBG (CALLDEBUG, printf ("[findcall]\tbut it's a botch\n"));
 349               length = 1;
 350               continue;
 351             }
 352         }
 353     }
 354 }