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 PARAMS ((unsigned char *));
  38 void i386_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
  39
  40 static int
  41 i386_iscall (ip)
  42      unsigned char *ip;
  43 {
  44   if (*ip == 0xe8)
  45     return 1;
  46   return 0;
  47 }
  48
  49
  50 void
  51 i386_find_call (parent, p_lowpc, p_highpc)
  52      Sym *parent;
  53      bfd_vma p_lowpc;
  54      bfd_vma p_highpc;
  55 {
  56   unsigned char *instructp;
  57   Sym *child;
  58   bfd_vma pc, destpc;
  59
  60   if (core_text_space == 0)
  61     {
  62       return;
  63     }
  64   if (p_lowpc < s_lowpc)
  65     {
  66       p_lowpc = s_lowpc;
  67     }
  68   if (p_highpc > s_highpc)
  69     {
  70       p_highpc = s_highpc;
  71     }
  72   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
  73                           parent->name, (unsigned long) p_lowpc,
  74                           (unsigned long) p_highpc));
  75
  76   for (pc = p_lowpc; pc < p_highpc; ++pc)
  77     {
  78       instructp = (unsigned char *) core_text_space + pc - core_text_sect->vma;
  79       if (i386_iscall (instructp))
  80         {
  81           DBG (CALLDEBUG,
  82                printf ("[findcall]\t0x%lx:call", (unsigned long) pc));
  83           /*
  84            *  regular pc relative addressing
  85            *    check that this is the address of
  86            *    a function.
  87            */
  88
  89           destpc = bfd_get_32 (core_bfd, instructp + 1) + pc + 5;
  90           if (destpc >= s_lowpc && destpc <= s_highpc)
  91             {
  92               child = sym_lookup (&symtab, destpc);
  93               if (child && child->addr == destpc)
  94                 {
  95                   /*
  96                    *      a hit
  97                    */
  98                   DBG (CALLDEBUG,
  99                        printf ("\tdestpc 0x%lx (%s)\n",
 100                                (unsigned long) destpc, child->name));
 101                   arc_add (parent, child, (unsigned long) 0);
 102                   instructp += 4;       /* call is a 5 byte instruction */
 103                   continue;
 104                 }
 105             }
 106           /*
 107            *  else:
 108            *    it looked like a callf, but it:
 109            *      a) wasn't actually a callf, or
 110            *      b) didn't point to a known function in the symtab, or
 111            *      c) something funny is going on.
 112            */
 113           DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
 114         }
 115     }
 116 }