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, (unsigned long) p_lowpc,
  59                           (unsigned long) p_highpc));
  60
  61   delta = (bfd_vma) core_text_space - core_text_sect->vma;
  62
  63   for (instructp = (unsigned char *) (p_lowpc + delta);
  64        instructp < (unsigned char *) (p_highpc + delta);
  65        instructp ++)
  66     {
  67       if (i386_iscall (instructp))
  68         {
  69           DBG (CALLDEBUG,
  70                printf ("[findcall]\t0x%x:call",
  71                        instructp - (unsigned char *) delta));
  72           /*
  73            *  regular pc relative addressing
  74            *    check that this is the address of
  75            *    a function.
  76            */
  77
  78           destpc = ((bfd_vma) bfd_get_32 (core_bfd, instructp + 1)
  79                     + (bfd_vma) instructp - (bfd_vma) delta + 5);
  80           if (destpc >= s_lowpc && destpc <= s_highpc)
  81             {
  82               child = sym_lookup (&symtab, destpc);
  83               if (child && child->addr == destpc)
  84                 {
  85                   /*
  86                    *      a hit
  87                    */
  88                   DBG (CALLDEBUG,
  89                        printf ("\tdestpc 0x%lx (%s)\n",
  90                                (unsigned long) destpc, child->name));
  91                   arc_add (parent, child, (unsigned long) 0);
  92                   instructp += 4;       /* call is a 5 byte instruction */
  93                   continue;
  94                 }
  95             }
  96           /*
  97            *  else:
  98            *    it looked like a callf, but it:
  99            *      a) wasn't actually a callf, or
 100            *      b) didn't point to a known function in the symtab, or
 101            *      c) something funny is going on.
 102            */
 103           DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
 104         }
 105     }
 106 }