gprof/i386.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 "core.h"
  22 #include "hist.h"
  23 #include "symtab.h"
  24
  25
  26 int
  27 DEFUN (iscall, (ip), unsigned char *ip)
  28 {
  29   if (*ip == 0xeb || *ip == 0x9a)
  30     return 1;
  31   return 0;
  32 }
  33
  34
  35 void
  36 find_call (parent, p_lowpc, p_highpc)
  37      Sym *parent;
  38      bfd_vma p_lowpc;
  39      bfd_vma p_highpc;
  40 {
  41   unsigned char *instructp;
  42   long length;
  43   Sym *child;
  44   bfd_vma destpc;
  45
  46   if (core_text_space == 0)
  47     {
  48       return;
  49     }
  50   if (p_lowpc < s_lowpc)
  51     {
  52       p_lowpc = s_lowpc;
  53     }
  54   if (p_highpc > s_highpc)
  55     {
  56       p_highpc = s_highpc;
  57     }
  58   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
  59                           parent->name, p_lowpc, p_highpc));
  60   for (instructp = (unsigned char *) core_text_space + p_lowpc;
  61        instructp < (unsigned char *) core_text_space + p_highpc;
  62        instructp += length)
  63     {
  64       length = 1;
  65       if (iscall (instructp))
  66         {
  67           DBG (CALLDEBUG,
  68                printf ("[findcall]\t0x%x:callf",
  69                        instructp - (unsigned char *) core_text_space));
  70           length = 4;
  71           /*
  72            *  regular pc relative addressing
  73            *    check that this is the address of
  74            *    a function.
  75            */
  76           destpc = ((bfd_vma) instructp + 5 - (bfd_vma) core_text_space);
  77           if (destpc >= s_lowpc && destpc <= s_highpc)
  78             {
  79               child = sym_lookup (&symtab, destpc);
  80               DBG (CALLDEBUG,
  81                    printf ("[findcall]\tdestpc 0x%lx", destpc);
  82                    printf (" child->name %s", child->name);
  83                    printf (" child->addr 0x%lx\n", child->addr);
  84                 );
  85               if (child->addr == destpc)
  86                 {
  87                   /*
  88                    *      a hit
  89                    */
  90                   arc_add (parent, child, (long) 0);
  91                   length += 4;  /* constant lengths */
  92                   continue;
  93                 }
  94               goto botched;
  95             }
  96           /*
  97            *  else:
  98            *    it looked like a callf,
  99            *    but it wasn't to anywhere.
 100            */
 101         botched:
 102           /*
 103            *  something funny going on.
 104            */
 105           DBG (CALLDEBUG, printf ("[findcall]\tbut it's a botch\n"));
 106           length = 1;
 107           continue;
 108         }
 109     }
 110 }