gprof/i386.c

   1 /*
   2  * Copyright (c) 1983, 2001 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 int i386_iscall PARAMS ((unsigned char *));
  26 void i386_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
  27
  28 int
  29 i386_iscall (ip)
  30      unsigned char *ip;
  31 {
  32   if (*ip == 0xe8)
  33     return 1;
  34   return 0;
  35 }
  36
  37
  38 void
  39 i386_find_call (parent, p_lowpc, p_highpc)
  40      Sym *parent;
  41      bfd_vma p_lowpc;
  42      bfd_vma p_highpc;
  43 {
  44   unsigned char *instructp;
  45   Sym *child;
  46   bfd_vma destpc, delta;
  47
  48   if (core_text_space == 0)
  49     {
  50       return;
  51     }
  52   if (p_lowpc < s_lowpc)
  53     {
  54       p_lowpc = s_lowpc;
  55     }
  56   if (p_highpc > s_highpc)
  57     {
  58       p_highpc = s_highpc;
  59     }
  60   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
  61                           parent->name, (unsigned long) p_lowpc,
  62                           (unsigned long) p_highpc));
  63
  64   delta = (bfd_vma) core_text_space - core_text_sect->vma;
  65
  66   for (instructp = (unsigned char *) (p_lowpc + delta);
  67        instructp < (unsigned char *) (p_highpc + delta);
  68        instructp ++)
  69     {
  70       if (i386_iscall (instructp))
  71         {
  72           DBG (CALLDEBUG,
  73                printf ("[findcall]\t0x%lx:call",
  74                        (unsigned long) (instructp - (unsigned char *) delta)));
  75           /*
  76            *  regular pc relative addressing
  77            *    check that this is the address of
  78            *    a function.
  79            */
  80
  81           destpc = ((bfd_vma) bfd_get_32 (core_bfd, instructp + 1)
  82                     + (bfd_vma) instructp - (bfd_vma) delta + 5);
  83           if (destpc >= s_lowpc && destpc <= s_highpc)
  84             {
  85               child = sym_lookup (&symtab, destpc);
  86               if (child && child->addr == destpc)
  87                 {
  88                   /*
  89                    *      a hit
  90                    */
  91                   DBG (CALLDEBUG,
  92                        printf ("\tdestpc 0x%lx (%s)\n",
  93                                (unsigned long) destpc, child->name));
  94                   arc_add (parent, child, (unsigned long) 0);
  95                   instructp += 4;       /* call is a 5 byte instruction */
  96                   continue;
  97                 }
  98             }
  99           /*
 100            *  else:
 101            *    it looked like a callf, but it:
 102            *      a) wasn't actually a callf, or
 103            *      b) didn't point to a known function in the symtab, or
 104            *      c) something funny is going on.
 105            */
 106           DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
 107         }
 108     }
 109 }