2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1983, 1993
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35 static char sccsid[] = "@(#)gprof.c 8.1 (Berkeley) 6/6/93";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <netinet/in.h>
50 static void getstrtab(FILE *, const char *);
51 static void getsymtab(FILE *, const char *);
52 static void gettextspace(FILE *);
53 static bool funcsymbol(struct nlist *);
55 static char *strtab; /* string table in core */
56 static long ssiz; /* size of the string table */
57 static struct exec xbuf; /* exec header of a.out */
59 /* Things which get -E excluded by default. */
60 static char *excludes[] = { "mcount", "__mcleanup", NULL };
63 * Set up string and symbol tables from a.out.
64 * and optionally the text space.
65 * On return symbol table is sorted by value.
67 * Returns 0 on success, -1 on failure.
70 aout_getnfile(const char *filename, char ***defaultEs)
74 nfile = fopen( filename ,"r");
76 err( 1 , "%s", filename );
77 fread(&xbuf, 1, sizeof(xbuf), nfile);
82 getstrtab(nfile, filename);
83 getsymtab(nfile, filename);
84 gettextspace( nfile );
87 if ( debug & AOUTDEBUG ) {
90 for (j = 0; j < nname; j++){
91 printf("[getnfile] 0X%08lx\t%s\n", nl[j].value, nl[j].name);
95 *defaultEs = excludes;
100 getstrtab(FILE *nfile, const char *filename)
103 fseek(nfile, (long)(N_SYMOFF(xbuf) + xbuf.a_syms), 0);
104 if (fread(&ssiz, sizeof (ssiz), 1, nfile) == 0)
105 errx( 1 , "%s: no string table (old format?)" , filename );
106 strtab = calloc(ssiz, 1);
108 errx( 1 , "%s: no room for %ld bytes of string table", filename , ssiz);
109 if (fread(strtab+sizeof(ssiz), ssiz-sizeof(ssiz), 1, nfile) != 1)
110 errx( 1 , "%s: error reading string table" , filename );
114 * Read in symbol table
117 getsymtab(FILE *nfile, const char *filename)
123 /* pass1 - count symbols */
124 fseek(nfile, (long)N_SYMOFF(xbuf), 0);
126 for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
127 fread(&nbuf, sizeof(nbuf), 1, nfile);
128 if ( ! funcsymbol( &nbuf ) ) {
134 errx( 1 , "%s: no symbols" , filename );
136 nl = (nltype *) calloc( askfor , sizeof(nltype) );
138 errx( 1 , "no room for %zu bytes of symbol table" ,
139 askfor * sizeof(nltype) );
141 /* pass2 - read symbols */
142 fseek(nfile, (long)N_SYMOFF(xbuf), 0);
145 for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
146 fread(&nbuf, sizeof(nbuf), 1, nfile);
147 if ( ! funcsymbol( &nbuf ) ) {
149 if ( debug & AOUTDEBUG ) {
150 printf( "[getsymtab] rejecting: 0x%x %s\n" ,
151 nbuf.n_type , strtab + nbuf.n_un.n_strx );
156 npe->value = nbuf.n_value;
157 npe->name = strtab+nbuf.n_un.n_strx;
159 if ( debug & AOUTDEBUG ) {
160 printf( "[getsymtab] %d %s 0x%08lx\n" ,
161 nname , npe -> name , npe -> value );
171 * read in the text space of an a.out file
174 gettextspace(FILE *nfile)
177 textspace = (u_char *) malloc( xbuf.a_text );
178 if ( textspace == NULL ) {
179 warnx("no room for %u bytes of text space: can't do -c" ,
183 (void) fseek( nfile , N_TXTOFF( xbuf ) , 0 );
184 if ( fread( textspace , 1 , xbuf.a_text , nfile ) != xbuf.a_text ) {
185 warnx("couldn't read text space: can't do -c");
193 funcsymbol(struct nlist *nlistp)
198 * must be a text symbol,
199 * and static text symbols don't qualify if aflag set.
201 if ( ! ( ( nlistp -> n_type == ( N_TEXT | N_EXT ) )
202 || ( ( nlistp -> n_type == N_TEXT ) && ( aflag == 0 ) ) ) ) {
206 * name must start with an underscore if uflag is set.
207 * can't have any `funny' characters in name,
208 * where `funny' means `.' (.o file names)
209 * need to make an exception for sparc .mul & co.
210 * perhaps we should just drop this code entirely...
212 name = strtab + nlistp -> n_un.n_strx;
213 if ( uflag && *name != '_' )
216 if ( *name == '.' ) {
220 if ( strcmp ( p, "mul" ) == 0 || strcmp ( p, "div" ) == 0 ||
221 strcmp ( p, "rem" ) == 0 )
225 while ( (c = *name++) ) {