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 "search_list.h"
  21 #include "source.h"
  22 #include "symtab.h"
  23 #include "cg_arcs.h"
  24 #include "corefile.h"
  25 #include "hist.h"
  26
  27 static int i386_iscall PARAMS ((unsigned char *));
  28 void i386_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
  29
  30 static int
  31 i386_iscall (ip)
  32      unsigned char *ip;
  33 {
  34   if (*ip == 0xe8)
  35     return 1;
  36   return 0;
  37 }
  38
  39
  40 void
  41 i386_find_call (parent, p_lowpc, p_highpc)
  42      Sym *parent;
  43      bfd_vma p_lowpc;
  44      bfd_vma p_highpc;
  45 {
  46   unsigned char *instructp;
  47   Sym *child;
  48   bfd_vma pc, destpc;
  49
  50   if (core_text_space == 0)
  51     {
  52       return;
  53     }
  54   if (p_lowpc < s_lowpc)
  55     {
  56       p_lowpc = s_lowpc;
  57     }
  58   if (p_highpc > s_highpc)
  59     {
  60       p_highpc = s_highpc;
  61     }
  62   DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
  63                           parent->name, (unsigned long) p_lowpc,
  64                           (unsigned long) p_highpc));
  65
  66   for (pc = p_lowpc; pc < p_highpc; ++pc)
  67     {
  68       instructp = (unsigned char *) core_text_space + pc - core_text_sect->vma;
  69       if (i386_iscall (instructp))
  70         {
  71           DBG (CALLDEBUG,
  72                printf ("[findcall]\t0x%lx:call", (unsigned long) pc));
  73           /*
  74            *  regular pc relative addressing
  75            *    check that this is the address of
  76            *    a function.
  77            */
  78
  79           destpc = bfd_get_32 (core_bfd, instructp + 1) + pc + 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 }