1  /*-
  2   * Copyright (c) 2006,2008 Joseph Koshy
  3   * 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   *
 14   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 15   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 16   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 17   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 18   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 19   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 20   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 21   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 22   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 23   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 24   * SUCH DAMAGE.
 25   */
 26  
 27  #include <sys/cdefs.h>
 28  
 29  #include <assert.h>
 30  #include <gelf.h>
 31  
 32  #include "_libelf.h"
 33  
 34  ELFTC_VCSID("$Id$");
 35  
 36  GElf_Syminfo *
 37  gelf_getsyminfo(Elf_Data *ed, int ndx, GElf_Syminfo *dst)
 38  {
 39  	int ec;
 40  	Elf *e;
 41  	size_t msz;
 42  	Elf_Scn *scn;
 43  	uint32_t sh_type;
 44  	struct _Libelf_Data *d;
 45  	Elf32_Syminfo *syminfo32;
 46  	Elf64_Syminfo *syminfo64;
 47  
 48  	d = (struct _Libelf_Data *) ed;
 49  
 50  	if (d == NULL || ndx < 0 || dst == NULL ||
 51  	    (scn = d->d_scn) == NULL ||
 52  	    (e = scn->s_elf) == NULL) {
 53  		LIBELF_SET_ERROR(ARGUMENT, 0);
 54  		return (NULL);
 55  	}
 56  
 57  	ec = e->e_class;
 58  	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 59  
 60  	if (ec == ELFCLASS32)
 61  		sh_type = scn->s_shdr.s_shdr32.sh_type;
 62  	else
 63  		sh_type = scn->s_shdr.s_shdr64.sh_type;
 64  
 65  	if (_libelf_xlate_shtype(sh_type) != ELF_T_SYMINFO) {
 66  		LIBELF_SET_ERROR(ARGUMENT, 0);
 67  		return (NULL);
 68  	}
 69  
 70  	msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version);
 71  
 72  	assert(msz > 0);
 73  	assert(ndx >= 0);
 74  
 75  	if (msz * (size_t) ndx >= d->d_data.d_size) {
 76  		LIBELF_SET_ERROR(ARGUMENT, 0);
 77  		return (NULL);
 78  	}
 79  
 80  	if (ec == ELFCLASS32) {
 81  
 82  		syminfo32 = (Elf32_Syminfo *) d->d_data.d_buf + ndx;
 83  
 84  		dst->si_boundto = syminfo32->si_boundto;
 85  		dst->si_flags   = syminfo32->si_flags;
 86  
 87  	} else {
 88  
 89  		syminfo64 = (Elf64_Syminfo *) d->d_data.d_buf + ndx;
 90  
 91  		*dst = *syminfo64;
 92  	}
 93  
 94  	return (dst);
 95  }
 96  
 97  int
 98  gelf_update_syminfo(Elf_Data *ed, int ndx, GElf_Syminfo *gs)
 99  {
100  	int ec;
101  	Elf *e;
102  	size_t msz;
103  	Elf_Scn *scn;
104  	uint32_t sh_type;
105  	struct _Libelf_Data *d;
106  	Elf32_Syminfo *syminfo32;
107  	Elf64_Syminfo *syminfo64;
108  
109  	d = (struct _Libelf_Data *) ed;
110  
111  	if (d == NULL || ndx < 0 || gs == NULL ||
112  	    (scn = d->d_scn) == NULL ||
113  	    (e = scn->s_elf) == NULL) {
114  		LIBELF_SET_ERROR(ARGUMENT, 0);
115  		return (0);
116  	}
117  
118  	ec = e->e_class;
119  	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
120  
121  	if (ec == ELFCLASS32)
122  		sh_type = scn->s_shdr.s_shdr32.sh_type;
123  	else
124  		sh_type = scn->s_shdr.s_shdr64.sh_type;
125  
126  	if (_libelf_xlate_shtype(sh_type) != ELF_T_SYMINFO) {
127  		LIBELF_SET_ERROR(ARGUMENT, 0);
128  		return (0);
129  	}
130  
131  	msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version);
132  
133  	assert(msz > 0);
134  	assert(ndx >= 0);
135  
136  	if (msz * (size_t) ndx >= d->d_data.d_size) {
137  		LIBELF_SET_ERROR(ARGUMENT, 0);
138  		return (0);
139  	}
140  
141  	if (ec == ELFCLASS32) {
142  		syminfo32 = (Elf32_Syminfo *) d->d_data.d_buf + ndx;
143  
144  		syminfo32->si_boundto  = gs->si_boundto;
145  		syminfo32->si_flags  = gs->si_flags;
146  
147  	} else {
148  		syminfo64 = (Elf64_Syminfo *) d->d_data.d_buf + ndx;
149  
150  		*syminfo64 = *gs;
151  	}
152  
153  	return (1);
154  }