1/*-
2 * Copyright (c) 1983, 1993
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 * 4. 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
30#if 0
31/* From: */
32#ifndef lint
33static char sccsid[] = "@(#)gprof.c	8.1 (Berkeley) 6/6/93";
34#endif /* not lint */
35#endif
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD$");
39
40#include <netinet/in.h>
41
42#include <a.out.h>
43#include <err.h>
44#include <string.h>
45
46#include "gprof.h"
47
48static void getstrtab(FILE *, const char *);
49static void getsymtab(FILE *, const char *);
50static void gettextspace(FILE *);
51static bool funcsymbol(struct nlist *);
52
53static char	*strtab;		/* string table in core */
54static long	ssiz;			/* size of the string table */
55static struct	exec xbuf;		/* exec header of a.out */
56
57/* Things which get -E excluded by default. */
58static char	*excludes[] = { "mcount", "__mcleanup", NULL };
59
60    /*
61     * Set up string and symbol tables from a.out.
62     *	and optionally the text space.
63     * On return symbol table is sorted by value.
64     *
65     * Returns 0 on success, -1 on failure.
66     */
67int
68aout_getnfile(const char *filename, char ***defaultEs)
69{
70    FILE	*nfile;
71
72    nfile = fopen( filename ,"r");
73    if (nfile == NULL)
74	err( 1 , "%s", filename );
75    fread(&xbuf, 1, sizeof(xbuf), nfile);
76    if (N_BADMAG(xbuf)) {
77	fclose(nfile);
78	return -1;
79    }
80    getstrtab(nfile, filename);
81    getsymtab(nfile, filename);
82    gettextspace( nfile );
83    fclose(nfile);
84#   ifdef DEBUG
85	if ( debug & AOUTDEBUG ) {
86	    register int j;
87
88	    for (j = 0; j < nname; j++){
89		printf("[getnfile] 0X%08lx\t%s\n", nl[j].value, nl[j].name);
90	    }
91	}
92#   endif /* DEBUG */
93    *defaultEs = excludes;
94    return 0;
95}
96
97static void
98getstrtab(FILE *nfile, const char *filename)
99{
100
101    fseek(nfile, (long)(N_SYMOFF(xbuf) + xbuf.a_syms), 0);
102    if (fread(&ssiz, sizeof (ssiz), 1, nfile) == 0)
103	errx( 1 , "%s: no string table (old format?)" , filename );
104    strtab = calloc(ssiz, 1);
105    if (strtab == NULL)
106	errx( 1 , "%s: no room for %ld bytes of string table", filename , ssiz);
107    if (fread(strtab+sizeof(ssiz), ssiz-sizeof(ssiz), 1, nfile) != 1)
108	errx( 1 , "%s: error reading string table" , filename );
109}
110
111    /*
112     * Read in symbol table
113     */
114static void
115getsymtab(FILE *nfile, const char *filename)
116{
117    register long	i;
118    int			askfor;
119    struct nlist	nbuf;
120
121    /* pass1 - count symbols */
122    fseek(nfile, (long)N_SYMOFF(xbuf), 0);
123    nname = 0;
124    for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
125	fread(&nbuf, sizeof(nbuf), 1, nfile);
126	if ( ! funcsymbol( &nbuf ) ) {
127	    continue;
128	}
129	nname++;
130    }
131    if (nname == 0)
132	errx( 1 , "%s: no symbols" , filename );
133    askfor = nname + 1;
134    nl = (nltype *) calloc( askfor , sizeof(nltype) );
135    if (nl == NULL)
136	errx( 1 , "no room for %zu bytes of symbol table" ,
137		askfor * sizeof(nltype) );
138
139    /* pass2 - read symbols */
140    fseek(nfile, (long)N_SYMOFF(xbuf), 0);
141    npe = nl;
142    nname = 0;
143    for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
144	fread(&nbuf, sizeof(nbuf), 1, nfile);
145	if ( ! funcsymbol( &nbuf ) ) {
146#	    ifdef DEBUG
147		if ( debug & AOUTDEBUG ) {
148		    printf( "[getsymtab] rejecting: 0x%x %s\n" ,
149			    nbuf.n_type , strtab + nbuf.n_un.n_strx );
150		}
151#	    endif /* DEBUG */
152	    continue;
153	}
154	npe->value = nbuf.n_value;
155	npe->name = strtab+nbuf.n_un.n_strx;
156#	ifdef DEBUG
157	    if ( debug & AOUTDEBUG ) {
158		printf( "[getsymtab] %d %s 0x%08lx\n" ,
159			nname , npe -> name , npe -> value );
160	    }
161#	endif /* DEBUG */
162	npe++;
163	nname++;
164    }
165    npe->value = -1;
166}
167
168    /*
169     *	read in the text space of an a.out file
170     */
171static void
172gettextspace(FILE *nfile)
173{
174
175    textspace = (u_char *) malloc( xbuf.a_text );
176    if ( textspace == NULL ) {
177	warnx("no room for %u bytes of text space: can't do -c" ,
178		  xbuf.a_text );
179	return;
180    }
181    (void) fseek( nfile , N_TXTOFF( xbuf ) , 0 );
182    if ( fread( textspace , 1 , xbuf.a_text , nfile ) != xbuf.a_text ) {
183	warnx("couldn't read text space: can't do -c");
184	free( textspace );
185	textspace = 0;
186	return;
187    }
188}
189
190static bool
191funcsymbol(struct nlist *nlistp)
192{
193    char	*name, c;
194
195	/*
196	 *	must be a text symbol,
197	 *	and static text symbols don't qualify if aflag set.
198	 */
199    if ( ! (  ( nlistp -> n_type == ( N_TEXT | N_EXT ) )
200	   || ( ( nlistp -> n_type == N_TEXT ) && ( aflag == 0 ) ) ) ) {
201	return FALSE;
202    }
203	/*
204	 *	name must start with an underscore if uflag is set.
205	 *	can't have any `funny' characters in name,
206	 *	where `funny' means `.' (.o file names)
207	 *	need to make an exception for sparc .mul & co.
208	 *	perhaps we should just drop this code entirely...
209	 */
210    name = strtab + nlistp -> n_un.n_strx;
211    if ( uflag && *name != '_' )
212	return FALSE;
213#ifdef sparc
214    if ( *name == '.' ) {
215	char *p = name + 1;
216	if ( *p == 'u' )
217	    p++;
218	if ( strcmp ( p, "mul" ) == 0 || strcmp ( p, "div" ) == 0 ||
219	     strcmp ( p, "rem" ) == 0 )
220		return TRUE;
221    }
222#endif
223    while ( (c = *name++) ) {
224	if ( c == '.' ) {
225	    return FALSE;
226	}
227    }
228    return TRUE;
229}
230