lib/libc/gen/nlist_ecoff.c

   1 /* $NetBSD: nlist_ecoff.c,v 1.17 2009/02/16 10:40:45 lukem Exp $ */
   2
   3 /*
   4  * Copyright (c) 1996 Christopher G. Demetriou
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *          This product includes software developed for the
  18  *          NetBSD Project.  See http://www.NetBSD.org/ for
  19  *          information about NetBSD.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #if defined(LIBC_SCCS) && !defined(lint)
  39 __RCSID("$NetBSD: nlist_ecoff.c,v 1.17 2009/02/16 10:40:45 lukem Exp $");
  40 #endif /* LIBC_SCCS and not lint */
  41
  42 #include "namespace.h"
  43 #include <sys/param.h>
  44 #include <sys/mman.h>
  45 #include <sys/stat.h>
  46 #include <sys/file.h>
  47
  48 #include <assert.h>
  49 #include <errno.h>
  50 #include <stdio.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <nlist.h>
  54
  55 #include "nlist_private.h"
  56 #ifdef NLIST_ECOFF
  57 #include <sys/exec_ecoff.h>
  58 #endif
  59
  60 #ifdef NLIST_ECOFF
  61 #define check(off, size)        ((off < 0) || (off + size > mappedsize))
  62 #define BAD                     do { rv = -1; goto out; } while (/*CONSTCOND*/0)
  63 #define BADUNMAP                do { rv = -1; goto unmap; } while (/*CONSTCOND*/0)
  64
  65 int
  66 __fdnlist_ecoff(fd, list)
  67         int fd;
  68         struct nlist *list;
  69 {
  70         struct nlist *p;
  71         struct ecoff_exechdr *exechdrp;
  72         struct ecoff_symhdr *symhdrp;
  73         struct ecoff_extsym *esyms;
  74         struct stat st;
  75         char *mappedfile;
  76         size_t mappedsize;
  77         u_long symhdroff, extstroff;
  78         u_int symhdrsize;
  79         int rv, nent;
  80         long i, nesyms;
  81
  82         _DIAGASSERT(fd != -1);
  83         _DIAGASSERT(list != NULL);
  84
  85         rv = -1;
  86
  87         /*
  88          * If we can't fstat() the file, something bad is going on.
  89          */
  90         if (fstat(fd, &st) < 0)
  91                 BAD;
  92
  93         /*
  94          * Map the file in its entirety.
  95          */
  96         if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) {
  97                 errno = EFBIG;
  98                 BAD;
  99         }
 100         mappedsize = st.st_size;
 101         mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE,
 102             fd, 0);
 103         if (mappedfile == (char *)-1)
 104                 BAD;
 105
 106         /*
 107          * Make sure we can access the executable's header
 108          * directly, and make sure the recognize the executable
 109          * as an ECOFF binary.
 110          */
 111         if (check(0, sizeof *exechdrp))
 112                 BADUNMAP;
 113         exechdrp = (struct ecoff_exechdr *)&mappedfile[0];
 114
 115         if (ECOFF_BADMAG(exechdrp))
 116                 BADUNMAP;
 117
 118         /*
 119          * Find the symbol list.
 120          */
 121         symhdroff = exechdrp->f.f_symptr;
 122         symhdrsize = exechdrp->f.f_nsyms;
 123
 124         if ((symhdroff + sizeof *symhdrp) > mappedsize ||
 125             sizeof *symhdrp != symhdrsize)
 126                 BADUNMAP;
 127         symhdrp = (struct ecoff_symhdr *)&mappedfile[symhdroff];
 128
 129         nesyms = symhdrp->esymMax;
 130         if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms))
 131                 BADUNMAP;
 132         esyms = (struct ecoff_extsym *)&mappedfile[symhdrp->cbExtOffset];
 133         extstroff = symhdrp->cbSsExtOffset;
 134
 135         /*
 136          * Clean out any left-over information for all valid entries.
 137          * Type and value are defined to be 0 if not found; historical
 138          * versions cleared other and desc as well.
 139          *
 140          * XXX Clearing anything other than n_type and n_value violates
 141          * the semantics given in the man page.
 142          */
 143         nent = 0;
 144         for (p = list; !ISLAST(p); ++p) {
 145                 p->n_type = 0;
 146                 p->n_other = 0;
 147                 p->n_desc = 0;
 148                 p->n_value = 0;
 149                 ++nent;
 150         }
 151
 152         for (i = 0; i < nesyms; i++) {
 153                 for (p = list; !ISLAST(p); p++) {
 154                         const char *nlistname;
 155                         char *symtabname;
 156
 157                         /* This may be incorrect */
 158                         nlistname = N_NAME(p);
 159                         if (*nlistname == '_')
 160                                 nlistname++;
 161
 162                         symtabname =
 163                             &mappedfile[extstroff + esyms[i].es_strindex];
 164
 165                         if (!strcmp(symtabname, nlistname)) {
 166                                 /*
 167                                  * Translate (roughly) from ECOFF to nlist
 168                                  */
 169                                 p->n_value = esyms[i].es_value;
 170                                 p->n_type = N_EXT;              /* XXX */
 171                                 p->n_desc = 0;                  /* XXX */
 172                                 p->n_other = 0;                 /* XXX */
 173
 174                                 if (--nent <= 0)
 175                                         goto done;
 176                                 break;  /* into next run of outer loop */
 177                         }
 178                 }
 179         }
 180
 181 done:
 182         rv = nent;
 183 unmap:
 184         munmap(mappedfile, mappedsize);
 185 out:
 186         return (rv);
 187 }
 188
 189 #endif /* NLIST_ECOFF */