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 "time_host.h"
  21
  22 /*
  23  * A symbol to be the child of indirect callf:
  24  */
  25 Sym indirectchild;
  26
  27
  28 operandenum
  29 operandmode (modep)
  30      unsigned char *modep;
  31 {
  32   long usesreg = ((long) *modep) & 0xf;
  33
  34   switch (((long) *modep) >> 4)
  35     {
  36     case 0:
  37     case 1:
  38     case 2:
  39     case 3:
  40       return literal;
  41     case 4:
  42       return indexed;
  43     case 5:
  44       return reg;
  45     case 6:
  46       return regdef;
  47     case 7:
  48       return autodec;
  49     case 8:
  50       return usesreg != 0xe ? autoinc : immediate;
  51     case 9:
  52       return usesreg != PC ? autoincdef : absolute;
  53     case 10:
  54       return usesreg != PC ? bytedisp : byterel;
  55     case 11:
  56       return usesreg != PC ? bytedispdef : bytereldef;
  57     case 12:
  58       return usesreg != PC ? worddisp : wordrel;
  59     case 13:
  60       return usesreg != PC ? worddispdef : wordreldef;
  61     case 14:
  62       return usesreg != PC ? longdisp : longrel;
  63     case 15:
  64       return usesreg != PC ? longdispdef : longreldef;
  65     }
  66   /* NOTREACHED */
  67 }
  68
  69 char *
  70 operandname (mode)
  71      operandenum mode;
  72 {
  73
  74   switch (mode)
  75     {
  76     case literal:
  77       return "literal";
  78     case indexed:
  79       return "indexed";
  80     case reg:
  81       return "register";
  82     case regdef:
  83       return "register deferred";
  84     case autodec:
  85       return "autodecrement";
  86     case autoinc:
  87       return "autoincrement";
  88     case autoincdef:
  89       return "autoincrement deferred";
  90     case bytedisp:
  91       return "byte displacement";
  92     case bytedispdef:
  93       return "byte displacement deferred";
  94     case byterel:
  95       return "byte relative";
  96     case bytereldef:
  97       return "byte relative deferred";
  98     case worddisp:
  99       return "word displacement";
 100     case worddispdef:
 101       return "word displacement deferred";
 102     case wordrel:
 103       return "word relative";
 104     case wordreldef:
 105       return "word relative deferred";
 106     case immediate:
 107       return "immediate";
 108     case absolute:
 109       return "absolute";
 110     case longdisp:
 111       return "long displacement";
 112     case longdispdef:
 113       return "long displacement deferred";
 114     case longrel:
 115       return "long relative";
 116     case longreldef:
 117       return "long relative deferred";
 118     }
 119   /* NOTREACHED */
 120 }
 121
 122 long
 123 operandlength (modep)
 124      unsigned char *modep;
 125 {
 126
 127   switch (operandmode (modep))
 128     {
 129     case literal:
 130     case reg:
 131     case regdef:
 132     case autodec:
 133     case autoinc:
 134     case autoincdef:
 135       return 1;
 136     case bytedisp:
 137     case bytedispdef:
 138     case byterel:
 139     case bytereldef:
 140       return 2;
 141     case worddisp:
 142     case worddispdef:
 143     case wordrel:
 144     case wordreldef:
 145       return 3;
 146     case immediate:
 147     case absolute:
 148     case longdisp:
 149     case longdispdef:
 150     case longrel:
 151     case longreldef:
 152       return 5;
 153     case indexed:
 154       return 1 + operandlength (modep + 1);
 155     }
 156   /* NOTREACHED */
 157 }
 158
 159 bfd_vma
 160 reladdr (modep)
 161      char *modep;
 162 {
 163   operandenum mode = operandmode (modep);
 164   char *cp;
 165   short *sp;
 166   long *lp;
 167   int i;
 168   long value = 0;
 169
 170   cp = modep;
 171   ++cp;                         /* skip over the mode */
 172   switch (mode)
 173     {
 174     default:
 175       fprintf (stderr, "[reladdr] not relative address\n");
 176       return (bfd_vma) modep;
 177     case byterel:
 178       return (bfd_vma) (cp + sizeof *cp + *cp);
 179     case wordrel:
 180       for (i = 0; i < sizeof *sp; i++)
 181         value = (value << 8) + (cp[i] & 0xff);
 182       return (bfd_vma) (cp + sizeof *sp + value);
 183     case longrel:
 184       for (i = 0; i < sizeof *lp; i++)
 185         value = (value << 8) + (cp[i] & 0xff);
 186       return (bfd_vma) (cp + sizeof *lp + value);
 187     }
 188 }
 189
 190 find_call (parent, p_lowpc, p_highpc)
 191      Sym *parent;
 192      bfd_vma p_lowpc;
 193      bfd_vma p_highpc;
 194 {
 195   unsigned char *instructp;
 196   long length;
 197   Sym *child;
 198   operandenum mode;
 199   operandenum firstmode;
 200   bfd_vma destpc;
 201   static bool inited = FALSE;
 202
 203   if (!inited)
 204     {
 205       inited = TRUE;
 206       sym_init (&indirectchild);
 207       indirectchild.cg.prop.fract = 1.0;
 208       indirectchild.cg.cyc.head = &indirectchild;
 209     }
 210
 211   if (textspace == 0)
 212     {
 213       return;
 214     }
 215   if (p_lowpc < s_lowpc)
 216     {
 217       p_lowpc = s_lowpc;
 218     }
 219   if (p_highpc > s_highpc)
 220     {
 221       p_highpc = s_highpc;
 222     }
 223   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%x to 0x%x\n",
 224                           parent->name, p_lowpc, p_highpc));
 225   for (instructp = textspace + p_lowpc;
 226        instructp < textspace + p_highpc;
 227        instructp += length)
 228     {
 229       length = 1;
 230       if (*instructp == CALLF)
 231         {
 232           /*
 233            *    maybe a callf, better check it out.
 234            *      skip the count of the number of arguments.
 235            */
 236           DBG (CALLDEBUG, printf ("[findcall]\t0x%x:callf",
 237                                   instructp - textspace));
 238           firstmode = operandmode (instructp + length);
 239           switch (firstmode)
 240             {
 241             case literal:
 242             case immediate:
 243               break;
 244             default:
 245               goto botched;
 246             }
 247           length += operandlength (instructp + length);
 248           mode = operandmode (instructp + length);
 249           DBG (CALLDEBUG,
 250                printf ("\tfirst operand is %s", operandname (firstmode));
 251                printf ("\tsecond operand is %s\n", operandname (mode));
 252             );
 253           switch (mode)
 254             {
 255             case regdef:
 256             case bytedispdef:
 257             case worddispdef:
 258             case longdispdef:
 259             case bytereldef:
 260             case wordreldef:
 261             case longreldef:
 262               /*
 263                *    indirect call: call through pointer
 264                *      either  *d(r)   as a parameter or local
 265                *              (r)     as a return value
 266                *              *f      as a global pointer
 267                *      [are there others that we miss?,
 268                *       e.g. arrays of pointers to functions???]
 269                */
 270               arc_add (parent, &indirectchild, (long) 0);
 271               length += operandlength (instructp + length);
 272               continue;
 273             case byterel:
 274             case wordrel:
 275             case longrel:
 276               /*
 277                *    regular pc relative addressing
 278                *      check that this is the address of
 279                *      a function.
 280                */
 281               destpc = reladdr (instructp + length)
 282                 - (bfd_vma) textspace;
 283               if (destpc >= s_lowpc && destpc <= s_highpc)
 284                 {
 285                   child = sym_lookup (destpc);
 286                   DBG (CALLDEBUG,
 287                        printf ("[findcall]\tdestpc 0x%x", destpc);
 288                        printf (" child->name %s", child->name);
 289                        printf (" child->addr 0x%x\n", child->addr);
 290                     );
 291                   if (child->addr == destpc)
 292                     {
 293                       /*
 294                        *    a hit
 295                        */
 296                       arc_add (parent, child, (long) 0);
 297                       length += operandlength (instructp + length);
 298                       continue;
 299                     }
 300                   goto botched;
 301                 }
 302               /*
 303                *    else:
 304                *      it looked like a callf,
 305                *      but it wasn't to anywhere.
 306                */
 307               goto botched;
 308             default:
 309             botched:
 310               /*
 311                *    something funny going on.
 312                */
 313               DBG (CALLDEBUG, printf ("[findcall]\tbut it's a botch\n"));
 314               length = 1;
 315               continue;
 316             }
 317         }
 318     }
 319 }