1 /* $NetBSD: reloc_mips64el.c,v 1.1.1.1 2018/08/16 18:17:47 jmcneill Exp $ */
2
3 /* reloc_mips64el.c - position independent MIPS64 ELF shared object relocator
4 Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
5 Copyright (C) 1999 Hewlett-Packard Co.
6 Contributed by David Mosberger <davidm@hpl.hp.com>.
7 Copyright (C) 2017 Lemote Co.
8 Contributed by Heiher <r@hev.cc>
9
10 All rights reserved.
11
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions
14 are met:
15
16 * Redistributions of source code must retain the above copyright
17 notice, this list of conditions and the following disclaimer.
18 * Redistributions in binary form must reproduce the above
19 copyright notice, this list of conditions and the following
20 disclaimer in the documentation and/or other materials
21 provided with the distribution.
22 * Neither the name of Hewlett-Packard Co. nor the names of its
23 contributors may be used to endorse or promote products derived
24 from this software without specific prior written permission.
25
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
27 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
28 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
29 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
30 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
31 BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
32 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
33 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
34 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
36 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
37 THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 SUCH DAMAGE.
39 */
40
41 #include <efi.h>
42 #include <efilib.h>
43
44 #include <elf.h>
45
_relocate(long ldbase,Elf64_Dyn * dyn,EFI_HANDLE image EFI_UNUSED,EFI_SYSTEM_TABLE * systab EFI_UNUSED)46 EFI_STATUS _relocate (long ldbase, Elf64_Dyn *dyn,
47 EFI_HANDLE image EFI_UNUSED,
48 EFI_SYSTEM_TABLE *systab EFI_UNUSED)
49 {
50 long relsz = 0, relent = 0, gotsz = 0;
51 Elf64_Rel *rel = 0;
52 unsigned long *addr = 0;
53 int i;
54
55 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
56 switch (dyn[i].d_tag) {
57 case DT_REL:
58 rel = (Elf64_Rel*)
59 ((unsigned long)dyn[i].d_un.d_ptr
60 + ldbase);
61 break;
62
63 case DT_RELSZ:
64 relsz = dyn[i].d_un.d_val;
65 break;
66
67 case DT_RELENT:
68 relent = dyn[i].d_un.d_val;
69 break;
70
71 case DT_PLTGOT:
72 addr = (unsigned long *)
73 ((unsigned long)dyn[i].d_un.d_ptr
74 + ldbase);
75 break;
76
77 case DT_MIPS_LOCAL_GOTNO:
78 gotsz = dyn[i].d_un.d_val;
79 break;
80
81 default:
82 break;
83 }
84 }
85
86 if ((!rel && relent == 0) && (!addr && gotsz == 0))
87 return EFI_SUCCESS;
88
89 if ((!rel && relent != 0) || (!addr && gotsz != 0))
90 return EFI_LOAD_ERROR;
91
92 while (gotsz > 0) {
93 *addr += ldbase;
94 addr += 1;
95 gotsz --;
96 }
97
98 while (relsz > 0) {
99 /* apply the relocs */
100 switch (ELF64_R_TYPE (swap_uint64 (rel->r_info))) {
101 case R_MIPS_NONE:
102 break;
103
104 case (R_MIPS_64 << 8) | R_MIPS_REL32:
105 addr = (unsigned long *)
106 (ldbase + rel->r_offset);
107 *addr += ldbase;
108 break;
109
110 default:
111 break;
112 }
113 rel = (Elf64_Rel*) ((char *) rel + relent);
114 relsz -= relent;
115 }
116 return EFI_SUCCESS;
117 }
118