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 "corefile.h"
  22 #include "hist.h"
  23 #include "symtab.h"
  24
  25
  26 int
  27 DEFUN (i386_iscall, (ip), unsigned char *ip)
  28 {
  29   if (*ip == 0xe8)
  30     return 1;
  31   return 0;
  32 }
  33
  34
  35 void
  36 i386_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   Sym *child;
  43   bfd_vma destpc, delta;
  44
  45   if (core_text_space == 0)
  46     {
  47       return;
  48     }
  49   if (p_lowpc < s_lowpc)
  50     {
  51       p_lowpc = s_lowpc;
  52     }
  53   if (p_highpc > s_highpc)
  54     {
  55       p_highpc = s_highpc;
  56     }
  57   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
  58                           parent->name, p_lowpc, p_highpc));
  59
  60   delta = (bfd_vma) core_text_space - core_text_sect->vma;
  61
  62   for (instructp = (unsigned char *) (p_lowpc + delta);
  63        instructp < (unsigned char *) (p_highpc + delta);
  64        instructp ++)
  65     {
  66       if (i386_iscall (instructp))
  67         {
  68           DBG (CALLDEBUG,
  69                printf ("[findcall]\t0x%x:call",
  70                        instructp - (unsigned char *) delta));
  71           /*
  72            *  regular pc relative addressing
  73            *    check that this is the address of
  74            *    a function.
  75            */
  76
  77           destpc = ((bfd_vma) bfd_get_32 (core_bfd, instructp + 1)
  78                     + (bfd_vma) instructp - (bfd_vma) delta + 5);
  79           if (destpc >= s_lowpc && destpc <= s_highpc)
  80             {
  81               child = sym_lookup (&symtab, destpc);
  82               if (child && child->addr == destpc)
  83                 {
  84                   /*
  85                    *      a hit
  86                    */
  87                   DBG (CALLDEBUG,
  88                        printf ("\tdestpc 0x%lx (%s)\n", destpc, child->name));
  89                   arc_add (parent, child, (long) 0);
  90                   instructp += 4;       /* call is a 5 byte instruction */
  91                   continue;
  92                 }
  93             }
  94           /*
  95            *  else:
  96            *    it looked like a callf, but it:
  97            *      a) wasn't actually a callf, or
  98            *      b) didn't point to a known function in the symtab, or
  99            *      c) something funny is going on.
 100            */
 101           DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
 102         }
 103     }
 104 }