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 <gelf.h>
 30  #include <libelf.h>
 31  #include <limits.h>
 32  
 33  #include "_libelf.h"
 34  
 35  ELFTC_VCSID("$Id$");
 36  
 37  Elf32_Phdr *
 38  elf32_getphdr(Elf *e)
 39  {
 40  	return (_libelf_getphdr(e, ELFCLASS32));
 41  }
 42  
 43  Elf64_Phdr *
 44  elf64_getphdr(Elf *e)
 45  {
 46  	return (_libelf_getphdr(e, ELFCLASS64));
 47  }
 48  
 49  GElf_Phdr *
 50  gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
 51  {
 52  	int ec;
 53  	Elf32_Ehdr *eh32;
 54  	Elf64_Ehdr *eh64;
 55  	Elf32_Phdr *ep32;
 56  	Elf64_Phdr *ep64;
 57  
 58  	if (d == NULL || e == NULL ||
 59  	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
 60  	    (e->e_kind != ELF_K_ELF) || index < 0) {
 61  		LIBELF_SET_ERROR(ARGUMENT, 0);
 62  		return (NULL);
 63  	}
 64  
 65  	if (ec == ELFCLASS32) {
 66  		if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
 67  		    ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
 68  			return (NULL);
 69  
 70  		if (index >= eh32->e_phnum) {
 71  			LIBELF_SET_ERROR(ARGUMENT, 0);
 72  			return (NULL);
 73  		}
 74  
 75  		ep32 += index;
 76  
 77  		d->p_type   = ep32->p_type;
 78  		d->p_offset = ep32->p_offset;
 79  		d->p_vaddr  = (Elf64_Addr) ep32->p_vaddr;
 80  		d->p_paddr  = (Elf64_Addr) ep32->p_paddr;
 81  		d->p_filesz = (Elf64_Xword) ep32->p_filesz;
 82  		d->p_memsz  = (Elf64_Xword) ep32->p_memsz;
 83  		d->p_flags  = ep32->p_flags;
 84  		d->p_align  = (Elf64_Xword) ep32->p_align;
 85  
 86  	} else {
 87  		if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
 88  		    (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
 89  			return (NULL);
 90  
 91  		if (index >= eh64->e_phnum) {
 92  			LIBELF_SET_ERROR(ARGUMENT, 0);
 93  			return (NULL);
 94  		}
 95  
 96  		ep64 += index;
 97  
 98  		*d = *ep64;
 99  	}
100  
101  	return (d);
102  }
103  
104  Elf32_Phdr *
105  elf32_newphdr(Elf *e, size_t count)
106  {
107  	return (_libelf_newphdr(e, ELFCLASS32, count));
108  }
109  
110  Elf64_Phdr *
111  elf64_newphdr(Elf *e, size_t count)
112  {
113  	return (_libelf_newphdr(e, ELFCLASS64, count));
114  }
115  
116  void *
117  gelf_newphdr(Elf *e, size_t count)
118  {
119  	if (e == NULL) {
120  		LIBELF_SET_ERROR(ARGUMENT, 0);
121  		return (NULL);
122  	}
123  	return (_libelf_newphdr(e, e->e_class, count));
124  }
125  
126  int
127  gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
128  {
129  	int ec, phnum;
130  	void *ehdr;
131  	Elf32_Phdr *ph32;
132  	Elf64_Phdr *ph64;
133  
134  	if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
135  	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
136  		LIBELF_SET_ERROR(ARGUMENT, 0);
137  		return (0);
138  	}
139  
140  	if (e->e_cmd == ELF_C_READ) {
141  		LIBELF_SET_ERROR(MODE, 0);
142  		return (0);
143  	}
144  
145  	if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
146  		return (0);
147  
148  	if (ec == ELFCLASS32)
149  		phnum = ((Elf32_Ehdr *) ehdr)->e_phnum;
150  	else
151  		phnum = ((Elf64_Ehdr *) ehdr)->e_phnum;
152  
153  	if (ndx < 0 || ndx > phnum) {
154  		LIBELF_SET_ERROR(ARGUMENT, 0);
155  		return (0);
156  	}
157  
158  	(void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
159  
160  	if (ec == ELFCLASS64) {
161  		ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
162  		*ph64 = *s;
163  		return (1);
164  	}
165  
166  	ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
167  
168  	ph32->p_type     =  s->p_type;
169  	ph32->p_flags    =  s->p_flags;
170  	LIBELF_COPY_U32(ph32, s, p_offset);
171  	LIBELF_COPY_U32(ph32, s, p_vaddr);
172  	LIBELF_COPY_U32(ph32, s, p_paddr);
173  	LIBELF_COPY_U32(ph32, s, p_filesz);
174  	LIBELF_COPY_U32(ph32, s, p_memsz);
175  	LIBELF_COPY_U32(ph32, s, p_align);
176  
177  	return (1);
178  }