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