gelf_mips64el.c revision 367457 
1/*-
2 * Copyright (c) 2018 John Baldwin
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <gelf.h>
27
28#include "_libelf.h"
29
30ELFTC_VCSID("$Id$");
31
32int
33_libelf_is_mips64el(Elf *e)
34{
35
36	return (e->e_kind == ELF_K_ELF && e->e_class == ELFCLASS64 &&
37	    e->e_u.e_elf.e_ehdr.e_ehdr64->e_machine == EM_MIPS &&
38	    e->e_u.e_elf.e_ehdr.e_ehdr64->e_ident[EI_DATA] == ELFDATA2LSB);
39}
40
41/*
42 * For MIPS64, the r_info field is actually stored as a 32-bit symbol
43 * index (r_sym) followed by four single-byte fields (r_ssym, r_type3,
44 * r_type2, and r_type).  The byte-swap for the little-endian case
45 * jumbles this incorrectly so compensate.
46 */
47Elf64_Xword
48_libelf_mips64el_r_info_tof(Elf64_Xword r_info)
49{
50	Elf64_Xword new_info;
51	uint8_t ssym, type3, type2, type;
52
53	ssym = r_info >> 24;
54	type3 = r_info >> 16;
55	type2 = r_info >> 8;
56	type = r_info;
57	new_info = r_info >> 32;
58	new_info |= (Elf64_Xword)ssym << 32;
59	new_info |= (Elf64_Xword)type3 << 40;
60	new_info |= (Elf64_Xword)type2 << 48;
61	new_info |= (Elf64_Xword)type << 56;
62	return (new_info);
63}
64
65Elf64_Xword
66_libelf_mips64el_r_info_tom(Elf64_Xword r_info)
67{
68	Elf64_Xword new_info;
69	uint8_t ssym, type3, type2, type;
70
71	ssym = r_info >> 32;
72	type3 = r_info >> 40;
73	type2 = r_info >> 48;
74	type = r_info >> 56;
75	new_info = (r_info & 0xffffffff) << 32;
76	new_info |= (Elf64_Xword)ssym << 24;
77	new_info |= (Elf64_Xword)type3 << 16;
78	new_info |= (Elf64_Xword)type2 << 8;
79	new_info |= (Elf64_Xword)type;
80	return (new_info);
81}
82