1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
4 * Copyright (C) 2007-2009 PetaLogix
5 */
6
7#include <linux/export.h>
8#include <linux/moduleloader.h>
9#include <linux/kernel.h>
10#include <linux/elf.h>
11#include <linux/vmalloc.h>
12#include <linux/fs.h>
13#include <linux/string.h>
14#include <linux/pgtable.h>
15
16#include <asm/cacheflush.h>
17
18int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
19	unsigned int symindex, unsigned int relsec, struct module *module)
20{
21
22	unsigned int i;
23	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
24	Elf32_Sym *sym;
25	unsigned long int *location;
26	unsigned long int value;
27
28	pr_debug("Applying add relocation section %u to %u\n",
29		relsec, sechdrs[relsec].sh_info);
30
31	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
32
33		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
34				rela[i].r_offset;
35		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
36			ELF32_R_SYM(rela[i].r_info);
37		value = sym->st_value + rela[i].r_addend;
38
39		switch (ELF32_R_TYPE(rela[i].r_info)) {
40
41		/*
42		 * Be careful! mb-gcc / mb-ld splits the relocs between the
43		 * text and the reloc table. In general this means we must
44		 * read the current contents of (*location), add any offset
45		 * then store the result back in
46		 */
47
48		case R_MICROBLAZE_32:
49			*location = value;
50			break;
51
52		case R_MICROBLAZE_64:
53			location[0] = (location[0] & 0xFFFF0000) |
54					(value >> 16);
55			location[1] = (location[1] & 0xFFFF0000) |
56					(value & 0xFFFF);
57			break;
58
59		case R_MICROBLAZE_64_PCREL:
60			value -= (unsigned long int)(location) + 4;
61			location[0] = (location[0] & 0xFFFF0000) |
62					(value >> 16);
63			location[1] = (location[1] & 0xFFFF0000) |
64					(value & 0xFFFF);
65			pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
66				value);
67			break;
68
69		case R_MICROBLAZE_32_PCREL_LO:
70			pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
71			break;
72
73		case R_MICROBLAZE_64_NONE:
74			pr_debug("R_MICROBLAZE_64_NONE\n");
75			break;
76
77		case R_MICROBLAZE_NONE:
78			pr_debug("R_MICROBLAZE_NONE\n");
79			break;
80
81		default:
82			pr_err("module %s: Unknown relocation: %u\n",
83				module->name,
84				ELF32_R_TYPE(rela[i].r_info));
85			return -ENOEXEC;
86		}
87	}
88	return 0;
89}
90
91int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
92		struct module *module)
93{
94	flush_dcache();
95	return 0;
96}
97