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gerrit-public.fairphone.software / kernel / msm-4.9 / 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 / . / arch / m68k / kernel / module.c
blob: 3b1a2ff61ddcf18846fc108859e964a6d28110fd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame^]1#include <linux/moduleloader.h>
2#include <linux/elf.h>
3#include <linux/vmalloc.h>
4#include <linux/fs.h>
5#include <linux/string.h>
6#include <linux/kernel.h>
7
8#if 0
9#define DEBUGP printk
10#else
11#define DEBUGP(fmt...)
12#endif
13
14void *module_alloc(unsigned long size)
15{
16 if (size == 0)
17 return NULL;
18 return vmalloc(size);
19}
20
21
22/* Free memory returned from module_alloc */
23void module_free(struct module *mod, void *module_region)
24{
25 vfree(module_region);
26 /* FIXME: If module_region == mod->init_region, trim exception
27 table entries. */
28}
29
30/* We don't need anything special. */
31int module_frob_arch_sections(Elf_Ehdr *hdr,
32 Elf_Shdr *sechdrs,
33 char *secstrings,
34 struct module *mod)
35{
36 return 0;
37}
38
39int apply_relocate(Elf32_Shdr *sechdrs,
40 const char *strtab,
41 unsigned int symindex,
42 unsigned int relsec,
43 struct module *me)
44{
45 unsigned int i;
46 Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
47 Elf32_Sym *sym;
48 uint32_t *location;
49
50 DEBUGP("Applying relocate section %u to %u\n", relsec,
51 sechdrs[relsec].sh_info);
52 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
53 /* This is where to make the change */
54 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
55 + rel[i].r_offset;
56 /* This is the symbol it is referring to. Note that all
57 undefined symbols have been resolved. */
58 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
59 + ELF32_R_SYM(rel[i].r_info);
60
61 switch (ELF32_R_TYPE(rel[i].r_info)) {
62 case R_68K_32:
63 /* We add the value into the location given */
64 *location += sym->st_value;
65 break;
66 case R_68K_PC32:
67 /* Add the value, subtract its postition */
68 *location += sym->st_value - (uint32_t)location;
69 break;
70 default:
71 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
72 me->name, ELF32_R_TYPE(rel[i].r_info));
73 return -ENOEXEC;
74 }
75 }
76 return 0;
77}
78
79int apply_relocate_add(Elf32_Shdr *sechdrs,
80 const char *strtab,
81 unsigned int symindex,
82 unsigned int relsec,
83 struct module *me)
84{
85 unsigned int i;
86 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
87 Elf32_Sym *sym;
88 uint32_t *location;
89
90 DEBUGP("Applying relocate_add section %u to %u\n", relsec,
91 sechdrs[relsec].sh_info);
92 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
93 /* This is where to make the change */
94 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
95 + rel[i].r_offset;
96 /* This is the symbol it is referring to. Note that all
97 undefined symbols have been resolved. */
98 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
99 + ELF32_R_SYM(rel[i].r_info);
100
101 switch (ELF32_R_TYPE(rel[i].r_info)) {
102 case R_68K_32:
103 /* We add the value into the location given */
104 *location = rel[i].r_addend + sym->st_value;
105 break;
106 case R_68K_PC32:
107 /* Add the value, subtract its postition */
108 *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
109 break;
110 default:
111 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
112 me->name, ELF32_R_TYPE(rel[i].r_info));
113 return -ENOEXEC;
114 }
115 }
116 return 0;
117}
118
119int module_finalize(const Elf_Ehdr *hdr,
120 const Elf_Shdr *sechdrs,
121 struct module *me)
122{
123 return 0;
124}
125
126void module_arch_cleanup(struct module *mod)
127{
128}