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 | |
18 | int 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 | |
91 | int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, |
92 | struct module *module) |
93 | { |
94 | flush_dcache(); |
95 | return 0; |
96 | } |
97 | |