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
37static int i386_iscall PARAMS ((unsigned char *));
38void i386_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
39
40static int
41i386_iscall (ip)
42     unsigned char *ip;
43{
44  if (*ip == 0xe8)
45    return 1;
46  return 0;
47}
48
49
50void
51i386_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}
117