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