gprof/i386.c

   1 /*
   2  * Copyright (c) 1983, 1993, 2001
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 #include "gprof.h"
  30 #include "search_list.h"
  31 #include "source.h"
  32 #include "symtab.h"
  33 #include "cg_arcs.h"
  34 #include "corefile.h"
  35 #include "hist.h"
  36
  37 static int i386_iscall (unsigned char *);
  38 void i386_find_call (Sym *, bfd_vma, bfd_vma);
  39
  40 static int
  41 i386_iscall (unsigned char *ip)
  42 {
  43   if (*ip == 0xe8)
  44     return 1;
  45   return 0;
  46 }
  47
  48
  49 void
  50 i386_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
  51 {
  52   unsigned char *instructp;
  53   Sym *child;
  54   bfd_vma pc, destpc;
  55
  56   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
  57                           parent->name, (unsigned long) p_lowpc,
  58                           (unsigned long) p_highpc));
  59
  60   if (p_highpc < 5)
  61     return;
  62   p_highpc -= 5;
  63   for (pc = p_lowpc; pc < p_highpc; ++pc)
  64     {
  65       instructp = (unsigned char *) core_text_space + pc - core_text_sect->vma;
  66       if (i386_iscall (instructp))
  67         {
  68           DBG (CALLDEBUG,
  69                printf ("[findcall]\t0x%lx:call", (unsigned long) pc));
  70           /*
  71            *  regular pc relative addressing
  72            *    check that this is the address of
  73            *    a function.
  74            */
  75
  76           destpc = bfd_get_32 (core_bfd, instructp + 1) + pc + 5;
  77           if (hist_check_address (destpc))
  78             {
  79               child = sym_lookup (&symtab, destpc);
  80               if (child && child->addr == destpc)
  81                 {
  82                   /*
  83                    *      a hit
  84                    */
  85                   DBG (CALLDEBUG,
  86                        printf ("\tdestpc 0x%lx (%s)\n",
  87                                (unsigned long) destpc, child->name));
  88                   arc_add (parent, child, (unsigned long) 0);
  89                   instructp += 4;       /* call is a 5 byte instruction */
  90                   continue;
  91                 }
  92             }
  93           /*
  94            *  else:
  95            *    it looked like a callf, but it:
  96            *      a) wasn't actually a callf, or
  97            *      b) didn't point to a known function in the symtab, or
  98            *      c) something funny is going on.
  99            */
 100           DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
 101         }
 102     }
 103 }