1 /* $NetBSD: reloc_riscv64.c,v 1.2 2021/09/30 19:09:10 jmcneill Exp $ */
2
3 // SPDX-License-Identifier: GPL-2.0+
4 /* reloc_riscv.c - position independent ELF shared object relocator
5 Copyright (C) 2018 Alexander Graf <agraf@suse.de>
6 Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
7 Copyright (C) 1999 Hewlett-Packard Co.
8 Contributed by David Mosberger <davidm@hpl.hp.com>.
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
43 #ifdef __NetBSD__
44 #include <sys/types.h>
45 #include <sys/exec_elf.h>
46 #else
47 #include <elf.h>
48 #endif
49
50 #define Elf_Dyn Elf64_Dyn
51 #define Elf_Rela Elf64_Rela
52 #define ELF_R_TYPE ELF64_R_TYPE
53
54 EFI_STATUS EFIAPI _relocate(long, Elf_Dyn *);
55
_relocate(long ldbase,Elf_Dyn * dyn)56 EFI_STATUS EFIAPI _relocate(long ldbase, Elf_Dyn *dyn)
57 {
58 long relsz = 0, relent = 0;
59 Elf_Rela *rel = NULL;
60 unsigned long *addr;
61 int i;
62
63 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
64 switch (dyn[i].d_tag) {
65 case DT_RELA:
66 rel = (Elf_Rela *)((unsigned long)dyn[i].d_un.d_ptr + ldbase);
67 break;
68 case DT_RELASZ:
69 relsz = dyn[i].d_un.d_val;
70 break;
71 case DT_RELAENT:
72 relent = dyn[i].d_un.d_val;
73 break;
74 default:
75 break;
76 }
77 }
78
79 if (!rel && relent == 0)
80 return EFI_SUCCESS;
81
82 if (!rel || relent == 0)
83 return EFI_LOAD_ERROR;
84
85 while (relsz > 0) {
86 /* apply the relocs */
87 switch (ELF_R_TYPE(rel->r_info)) {
88 case R_RISCV_RELATIVE:
89 addr = (unsigned long *)(ldbase + rel->r_offset);
90 *addr = ldbase + rel->r_addend;
91 break;
92 default:
93 /* Panic */
94 while (1) ;
95 }
96 rel = (Elf_Rela *)((char *)rel + relent);
97 relsz -= relent;
98 }
99 return EFI_SUCCESS;
100 }
101