/*- * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/types.h> #include <a.out.h> #include "gprof.h" static void getstrtab(FILE *, const char *); static void getsymtab(FILE *, const char *); static void gettextspace(FILE *); static bool funcsymbol(struct nlist *); static char *strtab; /* string table in core */ static long ssiz; /* size of the string table */ static struct exec xbuf; /* exec header of a.out */ /* Things which get -E excluded by default. */ static char *excludes[] = { "mcount", "__mcleanup", NULL }; /* * Set up string and symbol tables from a.out. * and optionally the text space. * On return symbol table is sorted by value. * * Returns 0 on success, -1 on failure. */ int getnfile(const char *filename, char ***defaultEs) { FILE *nfile; nfile = fopen( filename ,"r"); if (nfile == NULL) err(1, "fopen: %s", filename); fread(&xbuf, 1, sizeof(xbuf), nfile); if (N_BADMAG(xbuf)) { /* Bail out and let other binary formats try. */ fclose(nfile); return (-1); } getstrtab(nfile, filename); getsymtab(nfile, filename); gettextspace(nfile); fclose(nfile); #ifdef DEBUG if (debug & AOUTDEBUG) { int j; for (j = 0; j < nname; j++) { printf("[getnfile] 0X%08lx\t%s\n", nl[j].value, nl[j].name); } } #endif *defaultEs = excludes; return (0); } static void getstrtab(FILE *nfile, const char *filename) { fseek(nfile, (long)(N_SYMOFF(xbuf) + xbuf.a_syms), 0); if (fread(&ssiz, sizeof (ssiz), 1, nfile) == 0) errx(1, "%s: no string table (old format?)" , filename ); strtab = calloc(ssiz, 1); if (strtab == NULL) errx(1, "%s: no room for %d bytes of string table", filename, ssiz); if (fread(strtab + sizeof(ssiz), ssiz - sizeof(ssiz), 1, nfile) != 1) errx(1, "%s: error reading string table", filename ); } /* * Read in symbol table */ static void getsymtab(FILE *nfile, const char *filename) { struct nlist nbuf; int askfor; long i; /* pass1 - count symbols */ fseek(nfile, (long)N_SYMOFF(xbuf), 0); nname = 0; for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) { fread(&nbuf, sizeof(nbuf), 1, nfile); if (funcsymbol(&nbuf)) nname++; } if (nname == 0) errx(1, "%s: no symbols", filename); askfor = nname + 1; nl = calloc(askfor , sizeof(nltype)); if (nl == 0) errx(1, "No room for %d bytes of symbol table", askfor * sizeof(nltype)); /* pass2 - read symbols */ fseek(nfile, (long)N_SYMOFF(xbuf), 0); npe = nl; nname = 0; for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) { fread(&nbuf, sizeof(nbuf), 1, nfile); if (!funcsymbol(&nbuf)) { #ifdef DEBUG if (debug & AOUTDEBUG) { printf("[getsymtab] rejecting: 0x%x %s\n", nbuf.n_type, strtab + nbuf.n_un.n_strx); } #endif continue; } npe->value = nbuf.n_value; npe->name = strtab + nbuf.n_un.n_strx; #ifdef DEBUG if (debug & AOUTDEBUG) { printf("[getsymtab] %d %s 0x%08lx\n", nname, npe->name, npe->value); } #endif npe++; nname++; } npe->value = -1; } /* * read in the text space of an a.out file */ static void gettextspace(FILE *nfile) { if (cflag == 0) return; textspace = malloc(xbuf.a_text); if (textspace == 0) { warnx("ran out room for %d bytes of text space: can't do -c" , xbuf.a_text); return; } (void)fseek(nfile, N_TXTOFF(xbuf), 0); if (fread(textspace, 1, xbuf.a_text, nfile) != xbuf.a_text ) { warnx("couldn't read text space: can't do -c"); free(textspace); textspace = 0; return; } } static bool funcsymbol(struct nlist *nlistp) { char *name, c; /* * must be a text symbol, * and static text symbols don't qualify if aflag set. */ if (!((nlistp->n_type == (N_TEXT|N_EXT)) || ((nlistp->n_type == N_TEXT) && (aflag == 0)))) return FALSE; /* * name must start with an underscore if uflag is set. * can't have any `funny' characters in name, * where `funny' means `.' (.o file names) * need to make an exception for sparc .mul & co. * perhaps we should just drop this code entirely... */ name = strtab + nlistp -> n_un.n_strx; #ifdef sparc if (nlistp -> n_value & 3) return (FALSE); if (*name == '.') { char *p = name + 1; if (*p == 'u') p++; if (strcmp(p, "mul") == 0 || strcmp(p, "div") == 0 || strcmp(p, "rem") == 0 ) return (TRUE); } #endif while (c = *name++) { if (c == '.') { return (FALSE); } } return (TRUE); }