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
i386_iscall(unsigned char * ip)41 i386_iscall (unsigned char *ip)
42 {
43 if (*ip == 0xe8)
44 return 1;
45 return 0;
46 }
47
48
49 void
i386_find_call(Sym * parent,bfd_vma p_lowpc,bfd_vma p_highpc)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 if (p_highpc < 5)
61 return;
62 p_highpc -= 5;
63 for (pc = p_lowpc; pc < p_highpc; ++pc)
64 {
65 instructp = (unsigned char *) core_text_space + pc - core_text_sect->vma;
66 if (i386_iscall (instructp))
67 {
68 DBG (CALLDEBUG,
69 printf ("[findcall]\t0x%lx:call", (unsigned long) pc));
70 /*
71 * regular pc relative addressing
72 * check that this is the address of
73 * a function.
74 */
75
76 destpc = bfd_get_32 (core_bfd, instructp + 1) + pc + 5;
77 if (hist_check_address (destpc))
78 {
79 child = sym_lookup (&symtab, destpc);
80 if (child && child->addr == destpc)
81 {
82 /*
83 * a hit
84 */
85 DBG (CALLDEBUG,
86 printf ("\tdestpc 0x%lx (%s)\n",
87 (unsigned long) destpc, child->name));
88 arc_add (parent, child, (unsigned long) 0);
89 instructp += 4; /* call is a 5 byte instruction */
90 continue;
91 }
92 }
93 /*
94 * else:
95 * it looked like a callf, but it:
96 * a) wasn't actually a callf, or
97 * b) didn't point to a known function in the symtab, or
98 * c) something funny is going on.
99 */
100 DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
101 }
102 }
103 }
104