1 // SPDX-License-Identifier: GPL-2.0+
2 /* reloc_riscv.c - position independent ELF shared object relocator
3    Copyright (C) 2018 Alexander Graf <agraf@suse.de>
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 
8     All rights reserved.
9 
10     Redistribution and use in source and binary forms, with or without
11     modification, are permitted provided that the following conditions
12     are met:
13 
14     * Redistributions of source code must retain the above copyright
15       notice, this list of conditions and the following disclaimer.
16     * Redistributions in binary form must reproduce the above
17       copyright notice, this list of conditions and the following
18       disclaimer in the documentation and/or other materials
19       provided with the distribution.
20     * Neither the name of Hewlett-Packard Co. nor the names of its
21       contributors may be used to endorse or promote products derived
22       from this software without specific prior written permission.
23 
24     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
25     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
26     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
29     BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30     OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
31     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
32     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
34     TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
35     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36     SUCH DAMAGE.
37 */
38 
39 #include <efi.h>
40 
41 #include <elf.h>
42 
43 #if __riscv_xlen == 64
44 #define Elf_Dyn		Elf64_Dyn
45 #define Elf_Rela	Elf64_Rela
46 #define ELF_R_TYPE	ELF64_R_TYPE
47 #else
48 #define Elf_Dyn		Elf32_Dyn
49 #define Elf_Rela	Elf32_Rela
50 #define ELF_R_TYPE	ELF32_R_TYPE
51 #endif
52 
53 efi_status_t _relocate(long ldbase, Elf_Dyn *dyn, efi_handle_t image,
54 		       struct efi_system_table *systab)
55 {
56 	long relsz = 0, relent = 0;
57 	Elf_Rela *rel = 0;
58 	unsigned long *addr;
59 	int i;
60 
61 	for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
62 		switch (dyn[i].d_tag) {
63 		case DT_RELA:
64 			rel = (Elf_Rela *)((ulong)dyn[i].d_un.d_ptr + ldbase);
65 			break;
66 		case DT_RELASZ:
67 			relsz = dyn[i].d_un.d_val;
68 			break;
69 		case DT_RELAENT:
70 			relent = dyn[i].d_un.d_val;
71 			break;
72 		default:
73 			break;
74 		}
75 	}
76 
77 	if (!rel && relent == 0)
78 		return EFI_SUCCESS;
79 
80 	if (!rel || relent == 0)
81 		return EFI_LOAD_ERROR;
82 
83 	while (relsz > 0) {
84 		/* apply the relocs */
85 		switch (ELF_R_TYPE(rel->r_info)) {
86 		case R_RISCV_RELATIVE:
87 			addr = (ulong *)(ldbase + rel->r_offset);
88 			*addr = ldbase + rel->r_addend;
89 			break;
90 		default:
91 			/* Panic */
92 			while (1) ;
93 		}
94 		rel = (Elf_Rela *)((char *)rel + relent);
95 		relsz -= relent;
96 	}
97 	return EFI_SUCCESS;
98 }
99