1*f8fb3368SJohn Marino /*-
2*f8fb3368SJohn Marino * Copyright (c) 2011 Joseph Koshy
3*f8fb3368SJohn Marino * All rights reserved.
4*f8fb3368SJohn Marino *
5*f8fb3368SJohn Marino * Redistribution and use in source and binary forms, with or without
6*f8fb3368SJohn Marino * modification, are permitted provided that the following conditions
7*f8fb3368SJohn Marino * are met:
8*f8fb3368SJohn Marino * 1. Redistributions of source code must retain the above copyright
9*f8fb3368SJohn Marino * notice, this list of conditions and the following disclaimer.
10*f8fb3368SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
11*f8fb3368SJohn Marino * notice, this list of conditions and the following disclaimer in the
12*f8fb3368SJohn Marino * documentation and/or other materials provided with the distribution.
13*f8fb3368SJohn Marino *
14*f8fb3368SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15*f8fb3368SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16*f8fb3368SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17*f8fb3368SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18*f8fb3368SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19*f8fb3368SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20*f8fb3368SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21*f8fb3368SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22*f8fb3368SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23*f8fb3368SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24*f8fb3368SJohn Marino * SUCH DAMAGE.
25*f8fb3368SJohn Marino */
26*f8fb3368SJohn Marino
27*f8fb3368SJohn Marino #include <ar.h>
28*f8fb3368SJohn Marino #include <assert.h>
29*f8fb3368SJohn Marino #include <string.h>
30*f8fb3368SJohn Marino #include <libelf.h>
31*f8fb3368SJohn Marino
32*f8fb3368SJohn Marino #include "_libelf.h"
33*f8fb3368SJohn Marino
34*f8fb3368SJohn Marino ELFTC_VCSID("$Id: libelf_memory.c 3013 2014-03-23 06:16:59Z jkoshy $");
35*f8fb3368SJohn Marino
36*f8fb3368SJohn Marino /*
37*f8fb3368SJohn Marino * Create an ELF descriptor for a memory image, optionally reporting
38*f8fb3368SJohn Marino * parse errors.
39*f8fb3368SJohn Marino */
40*f8fb3368SJohn Marino
41*f8fb3368SJohn Marino Elf *
_libelf_memory(unsigned char * image,size_t sz,int reporterror)42*f8fb3368SJohn Marino _libelf_memory(unsigned char *image, size_t sz, int reporterror)
43*f8fb3368SJohn Marino {
44*f8fb3368SJohn Marino Elf *e;
45*f8fb3368SJohn Marino int e_class;
46*f8fb3368SJohn Marino enum Elf_Error error;
47*f8fb3368SJohn Marino unsigned int e_byteorder, e_version;
48*f8fb3368SJohn Marino
49*f8fb3368SJohn Marino assert(image != NULL);
50*f8fb3368SJohn Marino assert(sz > 0);
51*f8fb3368SJohn Marino
52*f8fb3368SJohn Marino if ((e = _libelf_allocate_elf()) == NULL)
53*f8fb3368SJohn Marino return (NULL);
54*f8fb3368SJohn Marino
55*f8fb3368SJohn Marino e->e_cmd = ELF_C_READ;
56*f8fb3368SJohn Marino e->e_rawfile = image;
57*f8fb3368SJohn Marino e->e_rawsize = sz;
58*f8fb3368SJohn Marino
59*f8fb3368SJohn Marino #undef LIBELF_IS_ELF
60*f8fb3368SJohn Marino #define LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && \
61*f8fb3368SJohn Marino (P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 && \
62*f8fb3368SJohn Marino (P)[EI_MAG3] == ELFMAG3)
63*f8fb3368SJohn Marino
64*f8fb3368SJohn Marino if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) {
65*f8fb3368SJohn Marino e_byteorder = image[EI_DATA];
66*f8fb3368SJohn Marino e_class = image[EI_CLASS];
67*f8fb3368SJohn Marino e_version = image[EI_VERSION];
68*f8fb3368SJohn Marino
69*f8fb3368SJohn Marino error = ELF_E_NONE;
70*f8fb3368SJohn Marino
71*f8fb3368SJohn Marino if (e_version > EV_CURRENT)
72*f8fb3368SJohn Marino error = ELF_E_VERSION;
73*f8fb3368SJohn Marino else if ((e_byteorder != ELFDATA2LSB && e_byteorder !=
74*f8fb3368SJohn Marino ELFDATA2MSB) || (e_class != ELFCLASS32 && e_class !=
75*f8fb3368SJohn Marino ELFCLASS64))
76*f8fb3368SJohn Marino error = ELF_E_HEADER;
77*f8fb3368SJohn Marino
78*f8fb3368SJohn Marino if (error != ELF_E_NONE) {
79*f8fb3368SJohn Marino if (reporterror) {
80*f8fb3368SJohn Marino LIBELF_PRIVATE(error) = LIBELF_ERROR(error, 0);
81*f8fb3368SJohn Marino (void) _libelf_release_elf(e);
82*f8fb3368SJohn Marino return (NULL);
83*f8fb3368SJohn Marino }
84*f8fb3368SJohn Marino } else {
85*f8fb3368SJohn Marino _libelf_init_elf(e, ELF_K_ELF);
86*f8fb3368SJohn Marino
87*f8fb3368SJohn Marino e->e_byteorder = e_byteorder;
88*f8fb3368SJohn Marino e->e_class = e_class;
89*f8fb3368SJohn Marino e->e_version = e_version;
90*f8fb3368SJohn Marino }
91*f8fb3368SJohn Marino } else if (sz >= SARMAG &&
92*f8fb3368SJohn Marino strncmp((const char *) image, ARMAG, (size_t) SARMAG) == 0)
93*f8fb3368SJohn Marino return (_libelf_ar_open(e, reporterror));
94*f8fb3368SJohn Marino
95*f8fb3368SJohn Marino return (e);
96*f8fb3368SJohn Marino }
97