aout.c revision 129652
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#if 0 35/* From: */ 36#ifndef lint 37static char sccsid[] = "@(#)gprof.c 8.1 (Berkeley) 6/6/93"; 38#endif /* not lint */ 39#endif 40 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: head/usr.bin/gprof/aout.c 129652 2004-05-24 11:59:17Z stefanf $"); 43 44#include <netinet/in.h> 45 46#include <a.out.h> 47#include <err.h> 48 49#include "gprof.h" 50 51static void getstrtab(FILE *, const char *); 52static void getsymtab(FILE *, const char *); 53static void gettextspace(FILE *); 54static bool funcsymbol(struct nlist *); 55 56static char *strtab; /* string table in core */ 57static long ssiz; /* size of the string table */ 58static struct exec xbuf; /* exec header of a.out */ 59 60/* Things which get -E excluded by default. */ 61static char *excludes[] = { "mcount", "__mcleanup", NULL }; 62 63 /* 64 * Set up string and symbol tables from a.out. 65 * and optionally the text space. 66 * On return symbol table is sorted by value. 67 * 68 * Returns 0 on success, -1 on failure. 69 */ 70int 71aout_getnfile(const char *filename, char ***defaultEs) 72{ 73 FILE *nfile; 74 int valcmp(); 75 76 nfile = fopen( filename ,"r"); 77 if (nfile == NULL) 78 err( 1 , "%s", filename ); 79 fread(&xbuf, 1, sizeof(xbuf), nfile); 80 if (N_BADMAG(xbuf)) { 81 fclose(nfile); 82 return -1; 83 } 84 getstrtab(nfile, filename); 85 getsymtab(nfile, filename); 86 gettextspace( nfile ); 87 fclose(nfile); 88# ifdef DEBUG 89 if ( debug & AOUTDEBUG ) { 90 register int j; 91 92 for (j = 0; j < nname; j++){ 93 printf("[getnfile] 0X%08lx\t%s\n", nl[j].value, nl[j].name); 94 } 95 } 96# endif /* DEBUG */ 97 *defaultEs = excludes; 98 return 0; 99} 100 101static void 102getstrtab(FILE *nfile, const char *filename) 103{ 104 105 fseek(nfile, (long)(N_SYMOFF(xbuf) + xbuf.a_syms), 0); 106 if (fread(&ssiz, sizeof (ssiz), 1, nfile) == 0) 107 errx( 1 , "%s: no string table (old format?)" , filename ); 108 strtab = calloc(ssiz, 1); 109 if (strtab == NULL) 110 errx( 1 , "%s: no room for %ld bytes of string table", filename , ssiz); 111 if (fread(strtab+sizeof(ssiz), ssiz-sizeof(ssiz), 1, nfile) != 1) 112 errx( 1 , "%s: error reading string table" , filename ); 113} 114 115 /* 116 * Read in symbol table 117 */ 118static void 119getsymtab(FILE *nfile, const char *filename) 120{ 121 register long i; 122 int askfor; 123 struct nlist nbuf; 124 125 /* pass1 - count symbols */ 126 fseek(nfile, (long)N_SYMOFF(xbuf), 0); 127 nname = 0; 128 for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) { 129 fread(&nbuf, sizeof(nbuf), 1, nfile); 130 if ( ! funcsymbol( &nbuf ) ) { 131 continue; 132 } 133 nname++; 134 } 135 if (nname == 0) 136 errx( 1 , "%s: no symbols" , filename ); 137 askfor = nname + 1; 138 nl = (nltype *) calloc( askfor , sizeof(nltype) ); 139 if (nl == 0) 140 errx( 1 , "no room for %d bytes of symbol table" , 141 askfor * sizeof(nltype) ); 142 143 /* pass2 - read symbols */ 144 fseek(nfile, (long)N_SYMOFF(xbuf), 0); 145 npe = nl; 146 nname = 0; 147 for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) { 148 fread(&nbuf, sizeof(nbuf), 1, nfile); 149 if ( ! funcsymbol( &nbuf ) ) { 150# ifdef DEBUG 151 if ( debug & AOUTDEBUG ) { 152 printf( "[getsymtab] rejecting: 0x%x %s\n" , 153 nbuf.n_type , strtab + nbuf.n_un.n_strx ); 154 } 155# endif /* DEBUG */ 156 continue; 157 } 158 npe->value = nbuf.n_value; 159 npe->name = strtab+nbuf.n_un.n_strx; 160# ifdef DEBUG 161 if ( debug & AOUTDEBUG ) { 162 printf( "[getsymtab] %d %s 0x%08lx\n" , 163 nname , npe -> name , npe -> value ); 164 } 165# endif /* DEBUG */ 166 npe++; 167 nname++; 168 } 169 npe->value = -1; 170} 171 172 /* 173 * read in the text space of an a.out file 174 */ 175static void 176gettextspace(FILE *nfile) 177{ 178 179 if ( cflag == 0 ) { 180 return; 181 } 182 textspace = (u_char *) malloc( xbuf.a_text ); 183 if ( textspace == 0 ) { 184 warnx("no room for %lu bytes of text space: can't do -c" , 185 xbuf.a_text ); 186 return; 187 } 188 (void) fseek( nfile , N_TXTOFF( xbuf ) , 0 ); 189 if ( fread( textspace , 1 , xbuf.a_text , nfile ) != xbuf.a_text ) { 190 warnx("couldn't read text space: can't do -c"); 191 free( textspace ); 192 textspace = 0; 193 return; 194 } 195} 196 197static bool 198funcsymbol(struct nlist *nlistp) 199{ 200 char *name, c; 201 202 /* 203 * must be a text symbol, 204 * and static text symbols don't qualify if aflag set. 205 */ 206 if ( ! ( ( nlistp -> n_type == ( N_TEXT | N_EXT ) ) 207 || ( ( nlistp -> n_type == N_TEXT ) && ( aflag == 0 ) ) ) ) { 208 return FALSE; 209 } 210 /* 211 * name must start with an underscore if uflag is set. 212 * can't have any `funny' characters in name, 213 * where `funny' means `.' (.o file names) 214 * need to make an exception for sparc .mul & co. 215 * perhaps we should just drop this code entirely... 216 */ 217 name = strtab + nlistp -> n_un.n_strx; 218 if ( uflag && *name != '_' ) 219 return FALSE; 220#ifdef sparc 221 if ( *name == '.' ) { 222 char *p = name + 1; 223 if ( *p == 'u' ) 224 p++; 225 if ( strcmp ( p, "mul" ) == 0 || strcmp ( p, "div" ) == 0 || 226 strcmp ( p, "rem" ) == 0 ) 227 return TRUE; 228 } 229#endif 230 while ( (c = *name++) ) { 231 if ( c == '.' ) { 232 return FALSE; 233 } 234 } 235 return TRUE; 236} 237