1 /* $OpenBSD: i386.c,v 1.10 2009/10/27 23:59:38 deraadt Exp $ */
2 /* $NetBSD: i386.c,v 1.5 1995/04/19 07:16:04 cgd Exp $ */
3
4 /*-
5 * Copyright (c) 1996 SigmaSoft, Th. Lockert
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "gprof.h"
30
31 #define iscall(off) ((*(u_char *)&textspace[off]) == 0xE8)
32
33 void
findcall(nltype * parentp,unsigned long p_lowpc,unsigned long p_highpc)34 findcall(nltype *parentp, unsigned long p_lowpc, unsigned long p_highpc)
35 {
36 unsigned long pc;
37 long len;
38 nltype *childp;
39 unsigned long destpc;
40 int off;
41
42 if (textspace == 0)
43 return;
44 if (p_lowpc < s_lowpc)
45 p_lowpc = s_lowpc;
46 if (p_highpc > s_highpc)
47 p_highpc = s_highpc;
48 # ifdef DEBUG
49 if ( debug & CALLDEBUG ) {
50 printf( "[findcall] %s: 0x%x to 0x%x\n" ,
51 parentp -> name , p_lowpc , p_highpc );
52 }
53 # endif /* DEBUG */
54 for (pc = p_lowpc; pc < p_highpc; pc += len) {
55 off = pc - s_lowpc;
56 len = 1;
57 if (iscall(off)) {
58 destpc = *(unsigned long *)&textspace[off + 1] + off + 5;
59 # ifdef DEBUG
60 if ( debug & CALLDEBUG ) {
61 printf( "[findcall]\t0x%x:calls" , pc - textspace );
62 printf( "\tdestpc 0x%x" , destpc );
63 }
64 # endif /* DEBUG */
65 if (destpc >= s_lowpc && destpc <= s_highpc) {
66 childp = nllookup(destpc);
67 # ifdef DEBUG
68 if ( debug & CALLDEBUG ) {
69 printf( " childp->name %s" , childp -> name );
70 printf( " childp->value 0x%x\n" ,
71 childp -> value );
72 }
73 # endif /* DEBUG */
74 if (childp != NULL && childp->value == destpc) {
75 addarc(parentp, childp, 0L);
76 len += 4;
77 continue;
78 }
79 }
80 # ifdef DEBUG
81 if ( debug & CALLDEBUG ) {
82 printf( "\tbut it's a botch\n" );
83 }
84 # endif /* DEBUG */
85 }
86 }
87 }
88