gprof/tahoe.c

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