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