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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
4e0c2098 YS |
2 | #include <linux/moduleloader.h> |
3 | #include <linux/elf.h> | |
4 | #include <linux/vmalloc.h> | |
5 | #include <linux/fs.h> | |
6 | #include <linux/string.h> | |
7 | #include <linux/kernel.h> | |
8 | ||
9 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
10 | const char *strtab, | |
11 | unsigned int symindex, | |
12 | unsigned int relsec, | |
13 | struct module *me) | |
14 | { | |
15 | unsigned int i; | |
16 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; | |
17 | ||
18 | pr_debug("Applying relocate section %u to %u\n", relsec, | |
19 | sechdrs[relsec].sh_info); | |
20 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { | |
21 | /* This is where to make the change */ | |
22 | uint32_t *loc = | |
23 | (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr | |
24 | + rela[i].r_offset); | |
25 | /* This is the symbol it is referring to. Note that all | |
26 | undefined symbols have been resolved. */ | |
27 | Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
28 | + ELF32_R_SYM(rela[i].r_info); | |
29 | uint32_t v = sym->st_value + rela[i].r_addend; | |
30 | ||
31 | switch (ELF32_R_TYPE(rela[i].r_info)) { | |
32 | case R_H8_DIR24R8: | |
33 | loc = (uint32_t *)((uint32_t)loc - 1); | |
34 | *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v); | |
35 | break; | |
36 | case R_H8_DIR24A8: | |
37 | if (ELF32_R_SYM(rela[i].r_info)) | |
38 | *loc += v; | |
39 | break; | |
40 | case R_H8_DIR32: | |
41 | case R_H8_DIR32A16: | |
42 | *loc += v; | |
43 | break; | |
44 | case R_H8_PCREL16: | |
45 | v -= (unsigned long)loc + 2; | |
46 | if ((Elf32_Sword)v > 0x7fff || | |
47 | (Elf32_Sword)v < -(Elf32_Sword)0x8000) | |
48 | goto overflow; | |
49 | else | |
50 | *(unsigned short *)loc = v; | |
51 | break; | |
52 | case R_H8_PCREL8: | |
53 | v -= (unsigned long)loc + 1; | |
54 | if ((Elf32_Sword)v > 0x7f || | |
55 | (Elf32_Sword)v < -(Elf32_Sword)0x80) | |
56 | goto overflow; | |
57 | else | |
58 | *(unsigned char *)loc = v; | |
59 | break; | |
60 | default: | |
61 | pr_err("module %s: Unknown relocation: %u\n", | |
62 | me->name, ELF32_R_TYPE(rela[i].r_info)); | |
63 | return -ENOEXEC; | |
64 | } | |
65 | } | |
66 | return 0; | |
67 | overflow: | |
68 | pr_err("module %s: relocation offset overflow: %08x\n", | |
69 | me->name, rela[i].r_offset); | |
70 | return -ENOEXEC; | |
71 | } |