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