gprof/vax.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 `calls' instruction
  39      */
  40 #define CALLS   0xfb
  41
  42     /*
  43      *        register for pc relative addressing
  44      */
  45 #define PC      0xf
  46
  47 enum 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 opermodes operandenum;
  55
  56 #if 0
  57 /* Here to document only.  We can't use this when cross compiling as
  58    the bitfield layout might not be the same as native.  */
  59 struct modebyte
  60   {
  61     unsigned int regfield:4;
  62     unsigned int modefield:4;
  63   };
  64 #endif
  65
  66 /*
  67  * A symbol to be the child of indirect calls:
  68  */
  69 static Sym indirectchild;
  70
  71 static operandenum vax_operandmode PARAMS ((unsigned char *));
  72 static char *vax_operandname PARAMS ((operandenum));
  73 static long vax_operandlength PARAMS ((unsigned char *));
  74 static bfd_signed_vma vax_offset PARAMS ((unsigned char *));
  75 void vax_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
  76
  77 static operandenum
  78 vax_operandmode (modep)
  79      unsigned char *modep;
  80 {
  81   int usesreg = *modep & 0xf;
  82
  83   switch ((*modep >> 4) & 0xf)
  84     {
  85     case 0:
  86     case 1:
  87     case 2:
  88     case 3:
  89       return literal;
  90     case 4:
  91       return indexed;
  92     case 5:
  93       return reg;
  94     case 6:
  95       return regdef;
  96     case 7:
  97       return autodec;
  98     case 8:
  99       return usesreg != PC ? autoinc : immediate;
 100     case 9:
 101       return usesreg != PC ? autoincdef : absolute;
 102     case 10:
 103       return usesreg != PC ? bytedisp : byterel;
 104     case 11:
 105       return usesreg != PC ? bytedispdef : bytereldef;
 106     case 12:
 107       return usesreg != PC ? worddisp : wordrel;
 108     case 13:
 109       return usesreg != PC ? worddispdef : wordreldef;
 110     case 14:
 111       return usesreg != PC ? longdisp : longrel;
 112     case 15:
 113       return usesreg != PC ? longdispdef : longreldef;
 114     }
 115   /* NOTREACHED */
 116   abort ();
 117 }
 118
 119 static char *
 120 vax_operandname (mode)
 121      operandenum mode;
 122 {
 123
 124   switch (mode)
 125     {
 126     case literal:
 127       return "literal";
 128     case indexed:
 129       return "indexed";
 130     case reg:
 131       return "register";
 132     case regdef:
 133       return "register deferred";
 134     case autodec:
 135       return "autodecrement";
 136     case autoinc:
 137       return "autoincrement";
 138     case autoincdef:
 139       return "autoincrement deferred";
 140     case bytedisp:
 141       return "byte displacement";
 142     case bytedispdef:
 143       return "byte displacement deferred";
 144     case byterel:
 145       return "byte relative";
 146     case bytereldef:
 147       return "byte relative deferred";
 148     case worddisp:
 149       return "word displacement";
 150     case worddispdef:
 151       return "word displacement deferred";
 152     case wordrel:
 153       return "word relative";
 154     case wordreldef:
 155       return "word relative deferred";
 156     case immediate:
 157       return "immediate";
 158     case absolute:
 159       return "absolute";
 160     case longdisp:
 161       return "long displacement";
 162     case longdispdef:
 163       return "long displacement deferred";
 164     case longrel:
 165       return "long relative";
 166     case longreldef:
 167       return "long relative deferred";
 168     }
 169   /* NOTREACHED */
 170   abort ();
 171 }
 172
 173 static long
 174 vax_operandlength (modep)
 175      unsigned char *modep;
 176 {
 177
 178   switch (vax_operandmode (modep))
 179     {
 180     case literal:
 181     case reg:
 182     case regdef:
 183     case autodec:
 184     case autoinc:
 185     case autoincdef:
 186       return 1;
 187     case bytedisp:
 188     case bytedispdef:
 189     case byterel:
 190     case bytereldef:
 191       return 2;
 192     case worddisp:
 193     case worddispdef:
 194     case wordrel:
 195     case wordreldef:
 196       return 3;
 197     case immediate:
 198     case absolute:
 199     case longdisp:
 200     case longdispdef:
 201     case longrel:
 202     case longreldef:
 203       return 5;
 204     case indexed:
 205       return 1 + vax_operandlength (modep + 1);
 206     }
 207   /* NOTREACHED */
 208   abort ();
 209 }
 210
 211 static bfd_signed_vma
 212 vax_offset (modep)
 213      unsigned char *modep;
 214 {
 215   operandenum mode = vax_operandmode (modep);
 216
 217   ++modep;                              /* skip over the mode */
 218   switch (mode)
 219     {
 220     default:
 221       fprintf (stderr, "[reladdr] not relative address\n");
 222       return 0;
 223     case byterel:
 224       return 1 + bfd_get_signed_8 (core_bfd, modep);
 225     case wordrel:
 226       return 2 + bfd_get_signed_16 (core_bfd, modep);
 227     case longrel:
 228       return 4 + bfd_get_signed_32 (core_bfd, modep);
 229     }
 230 }
 231
 232
 233 void
 234 vax_find_call (parent, p_lowpc, p_highpc)
 235      Sym *parent;
 236      bfd_vma p_lowpc;
 237      bfd_vma p_highpc;
 238 {
 239   unsigned char *instructp;
 240   long length;
 241   Sym *child;
 242   operandenum mode;
 243   operandenum firstmode;
 244   bfd_vma pc, destpc;
 245   static boolean inited = false;
 246
 247   if (!inited)
 248     {
 249       inited = true;
 250       sym_init (&indirectchild);
 251       indirectchild.cg.prop.fract = 1.0;
 252       indirectchild.cg.cyc.head = &indirectchild;
 253     }
 254
 255   if (core_text_space == 0)
 256     {
 257       return;
 258     }
 259   if (p_lowpc < s_lowpc)
 260     {
 261       p_lowpc = s_lowpc;
 262     }
 263   if (p_highpc > s_highpc)
 264     {
 265       p_highpc = s_highpc;
 266     }
 267   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
 268                           parent->name, (unsigned long) p_lowpc,
 269                           (unsigned long) p_highpc));
 270   for (pc = p_lowpc; pc < p_highpc; pc += length)
 271     {
 272       length = 1;
 273       instructp = ((unsigned char *) core_text_space
 274                    + pc - core_text_sect->vma);
 275       if ((*instructp & 0xff) == CALLS)
 276         {
 277           /*
 278            *    maybe a calls, better check it out.
 279            *      skip the count of the number of arguments.
 280            */
 281           DBG (CALLDEBUG,
 282                printf ("[findcall]\t0x%lx:calls", (unsigned long) pc));
 283           firstmode = vax_operandmode (instructp + length);
 284           switch (firstmode)
 285             {
 286             case literal:
 287             case immediate:
 288               break;
 289             default:
 290               goto botched;
 291             }
 292           length += vax_operandlength (instructp + length);
 293           mode = vax_operandmode (instructp + length);
 294           DBG (CALLDEBUG,
 295                printf ("\tfirst operand is %s", vax_operandname (firstmode));
 296                printf ("\tsecond operand is %s\n", vax_operandname (mode)));
 297           switch (mode)
 298             {
 299             case regdef:
 300             case bytedispdef:
 301             case worddispdef:
 302             case longdispdef:
 303             case bytereldef:
 304             case wordreldef:
 305             case longreldef:
 306               /*
 307                *    indirect call: call through pointer
 308                *      either  *d(r)   as a parameter or local
 309                *              (r)     as a return value
 310                *              *f      as a global pointer
 311                *      [are there others that we miss?,
 312                *       e.g. arrays of pointers to functions???]
 313                */
 314               arc_add (parent, &indirectchild, (unsigned long) 0);
 315               length += vax_operandlength (instructp + length);
 316               continue;
 317             case byterel:
 318             case wordrel:
 319             case longrel:
 320               /*
 321                *    regular pc relative addressing
 322                *      check that this is the address of
 323                *      a function.
 324                */
 325               destpc = pc + vax_offset (instructp + length);
 326               if (destpc >= s_lowpc && destpc <= s_highpc)
 327                 {
 328                   child = sym_lookup (&symtab, destpc);
 329                   DBG (CALLDEBUG,
 330                        printf ("[findcall]\tdestpc 0x%lx",
 331                                (unsigned long) destpc);
 332                        printf (" child->name %s", child->name);
 333                        printf (" child->addr 0x%lx\n",
 334                                (unsigned long) child->addr);
 335                     );
 336                   if (child->addr == destpc)
 337                     {
 338                       /*
 339                        *    a hit
 340                        */
 341                       arc_add (parent, child, (unsigned long) 0);
 342                       length += vax_operandlength (instructp + length);
 343                       continue;
 344                     }
 345                   goto botched;
 346                 }
 347               /*
 348                *    else:
 349                *      it looked like a calls,
 350                *      but it wasn't to anywhere.
 351                */
 352               goto botched;
 353             default:
 354             botched:
 355               /*
 356                *    something funny going on.
 357                */
 358               DBG (CALLDEBUG, printf ("[findcall]\tbut it's a botch\n"));
 359               length = 1;
 360               continue;
 361             }
 362         }
 363     }
 364 }