gprof/vax.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 `calls' instruction
  27      */
  28 #define CALLS   0xfb
  29
  30     /*
  31      *        register for pc relative addressing
  32      */
  33 #define PC      0xf
  34
  35 enum 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 opermodes operandenum;
  43
  44 struct modebyte
  45   {
  46     unsigned int regfield:4;
  47     unsigned int modefield:4;
  48   };
  49
  50 /*
  51  * A symbol to be the child of indirect calls:
  52  */
  53 Sym indirectchild;
  54
  55
  56 static operandenum
  57 vax_operandmode (modep)
  58      struct modebyte *modep;
  59 {
  60   long usesreg = modep->regfield;
  61
  62   switch (modep->modefield)
  63     {
  64     case 0:
  65     case 1:
  66     case 2:
  67     case 3:
  68       return literal;
  69     case 4:
  70       return indexed;
  71     case 5:
  72       return reg;
  73     case 6:
  74       return regdef;
  75     case 7:
  76       return autodec;
  77     case 8:
  78       return usesreg != PC ? autoinc : immediate;
  79     case 9:
  80       return usesreg != PC ? autoincdef : absolute;
  81     case 10:
  82       return usesreg != PC ? bytedisp : byterel;
  83     case 11:
  84       return usesreg != PC ? bytedispdef : bytereldef;
  85     case 12:
  86       return usesreg != PC ? worddisp : wordrel;
  87     case 13:
  88       return usesreg != PC ? worddispdef : wordreldef;
  89     case 14:
  90       return usesreg != PC ? longdisp : longrel;
  91     case 15:
  92       return usesreg != PC ? longdispdef : longreldef;
  93     }
  94   /* NOTREACHED */
  95   abort ();
  96 }
  97
  98 static char *
  99 vax_operandname (mode)
 100      operandenum mode;
 101 {
 102
 103   switch (mode)
 104     {
 105     case literal:
 106       return "literal";
 107     case indexed:
 108       return "indexed";
 109     case reg:
 110       return "register";
 111     case regdef:
 112       return "register deferred";
 113     case autodec:
 114       return "autodecrement";
 115     case autoinc:
 116       return "autoincrement";
 117     case autoincdef:
 118       return "autoincrement deferred";
 119     case bytedisp:
 120       return "byte displacement";
 121     case bytedispdef:
 122       return "byte displacement deferred";
 123     case byterel:
 124       return "byte relative";
 125     case bytereldef:
 126       return "byte relative deferred";
 127     case worddisp:
 128       return "word displacement";
 129     case worddispdef:
 130       return "word displacement deferred";
 131     case wordrel:
 132       return "word relative";
 133     case wordreldef:
 134       return "word relative deferred";
 135     case immediate:
 136       return "immediate";
 137     case absolute:
 138       return "absolute";
 139     case longdisp:
 140       return "long displacement";
 141     case longdispdef:
 142       return "long displacement deferred";
 143     case longrel:
 144       return "long relative";
 145     case longreldef:
 146       return "long relative deferred";
 147     }
 148   /* NOTREACHED */
 149   abort ();
 150 }
 151
 152 static long
 153 vax_operandlength (modep)
 154      struct modebyte *modep;
 155 {
 156
 157   switch (vax_operandmode (modep))
 158     {
 159     case literal:
 160     case reg:
 161     case regdef:
 162     case autodec:
 163     case autoinc:
 164     case autoincdef:
 165       return 1;
 166     case bytedisp:
 167     case bytedispdef:
 168     case byterel:
 169     case bytereldef:
 170       return 2;
 171     case worddisp:
 172     case worddispdef:
 173     case wordrel:
 174     case wordreldef:
 175       return 3;
 176     case immediate:
 177     case absolute:
 178     case longdisp:
 179     case longdispdef:
 180     case longrel:
 181     case longreldef:
 182       return 5;
 183     case indexed:
 184       return 1 + vax_operandlength ((struct modebyte *) ((char *) modep) + 1);
 185     }
 186   /* NOTREACHED */
 187   abort ();
 188 }
 189
 190 static bfd_vma
 191 vax_reladdr (modep)
 192      struct modebyte *modep;
 193 {
 194   operandenum mode = vax_operandmode (modep);
 195   char *cp;
 196   short *sp;
 197   long *lp;
 198
 199   cp = (char *) modep;
 200   ++cp;                         /* skip over the mode */
 201   switch (mode)
 202     {
 203     default:
 204       fprintf (stderr, "[reladdr] not relative address\n");
 205       return (bfd_vma) modep;
 206     case byterel:
 207       return (bfd_vma) (cp + sizeof *cp + *cp);
 208     case wordrel:
 209       sp = (short *) cp;
 210       return (bfd_vma) (cp + sizeof *sp + *sp);
 211     case longrel:
 212       lp = (long *) cp;
 213       return (bfd_vma) (cp + sizeof *lp + *lp);
 214     }
 215 }
 216
 217
 218 void
 219 vax_find_call (parent, p_lowpc, p_highpc)
 220      Sym *parent;
 221      bfd_vma p_lowpc;
 222      bfd_vma p_highpc;
 223 {
 224   unsigned char *instructp;
 225   long length;
 226   Sym *child;
 227   operandenum mode;
 228   operandenum firstmode;
 229   bfd_vma destpc;
 230   static bool inited = FALSE;
 231
 232   if (!inited)
 233     {
 234       inited = TRUE;
 235       sym_init (&indirectchild);
 236       indirectchild.cg.prop.fract = 1.0;
 237       indirectchild.cg.cyc.head = &indirectchild;
 238     }
 239
 240   if (core_text_space == 0)
 241     {
 242       return;
 243     }
 244   if (p_lowpc < s_lowpc)
 245     {
 246       p_lowpc = s_lowpc;
 247     }
 248   if (p_highpc > s_highpc)
 249     {
 250       p_highpc = s_highpc;
 251     }
 252   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
 253                           parent->name, p_lowpc, p_highpc));
 254   for (instructp = (unsigned char *) core_text_space + p_lowpc;
 255        instructp < (unsigned char *) core_text_space + p_highpc;
 256        instructp += length)
 257     {
 258       length = 1;
 259       if (*instructp == CALLS)
 260         {
 261           /*
 262            *    maybe a calls, better check it out.
 263            *      skip the count of the number of arguments.
 264            */
 265           DBG (CALLDEBUG,
 266                printf ("[findcall]\t0x%x:calls",
 267                        instructp - (unsigned char *) core_text_space));
 268           firstmode = vax_operandmode ((struct modebyte *) (instructp + length));
 269           switch (firstmode)
 270             {
 271             case literal:
 272             case immediate:
 273               break;
 274             default:
 275               goto botched;
 276             }
 277           length += vax_operandlength ((struct modebyte *) (instructp + length));
 278           mode = vax_operandmode ((struct modebyte *) (instructp + length));
 279           DBG (CALLDEBUG,
 280                printf ("\tfirst operand is %s", vax_operandname (firstmode));
 281                printf ("\tsecond operand is %s\n", vax_operandname (mode)));
 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 += vax_operandlength (
 301                                   (struct modebyte *) (instructp + length));
 302               continue;
 303             case byterel:
 304             case wordrel:
 305             case longrel:
 306               /*
 307                *    regular pc relative addressing
 308                *      check that this is the address of
 309                *      a function.
 310                */
 311               destpc = vax_reladdr ((struct modebyte *) (instructp + length))
 312                 - (bfd_vma) core_text_space;
 313               if (destpc >= s_lowpc && destpc <= s_highpc)
 314                 {
 315                   child = sym_lookup (&symtab, destpc);
 316                   DBG (CALLDEBUG,
 317                        printf ("[findcall]\tdestpc 0x%lx", destpc);
 318                        printf (" child->name %s", child->name);
 319                        printf (" child->addr 0x%lx\n", child->addr);
 320                     );
 321                   if (child->addr == destpc)
 322                     {
 323                       /*
 324                        *    a hit
 325                        */
 326                       arc_add (parent, child, (unsigned long) 0);
 327                       length += vax_operandlength ((struct modebyte *)
 328                                                    (instructp + length));
 329                       continue;
 330                     }
 331                   goto botched;
 332                 }
 333               /*
 334                *    else:
 335                *      it looked like a calls,
 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 }