take init_fs to saner place
[linux-3.10.git] / arch / h8300 / kernel / module.c
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
14 void *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 */
23 void 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. */
31 int module_frob_arch_sections(Elf_Ehdr *hdr,
32                               Elf_Shdr *sechdrs,
33                               char *secstrings,
34                               struct module *mod)
35 {
36         return 0;
37 }
38
39 int apply_relocate(Elf32_Shdr *sechdrs,
40                    const char *strtab,
41                    unsigned int symindex,
42                    unsigned int relsec,
43                    struct module *me)
44 {
45         printk(KERN_ERR "module %s: RELOCATION unsupported\n",
46                me->name);
47         return -ENOEXEC;
48 }
49
50 int apply_relocate_add(Elf32_Shdr *sechdrs,
51                        const char *strtab,
52                        unsigned int symindex,
53                        unsigned int relsec,
54                        struct module *me)
55 {
56         unsigned int i;
57         Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
58
59         DEBUGP("Applying relocate section %u to %u\n", relsec,
60                sechdrs[relsec].sh_info);
61         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
62                 /* This is where to make the change */
63                 uint32_t *loc = (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr
64                                              + rela[i].r_offset);
65                 /* This is the symbol it is referring to.  Note that all
66                    undefined symbols have been resolved.  */
67                 Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
68                         + ELF32_R_SYM(rela[i].r_info);
69                 uint32_t v = sym->st_value + rela[i].r_addend;
70
71                 switch (ELF32_R_TYPE(rela[i].r_info)) {
72                 case R_H8_DIR24R8:
73                         loc = (uint32_t *)((uint32_t)loc - 1);
74                         *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
75                         break;
76                 case R_H8_DIR24A8:
77                         if (ELF32_R_SYM(rela[i].r_info))
78                                 *loc += v;
79                         break;
80                 case R_H8_DIR32:
81                 case R_H8_DIR32A16:
82                         *loc += v;
83                         break;
84                 case R_H8_PCREL16:
85                         v -= (unsigned long)loc + 2;
86                         if ((Elf32_Sword)v > 0x7fff || 
87                             (Elf32_Sword)v < -(Elf32_Sword)0x8000)
88                                 goto overflow;
89                         else 
90                                 *(unsigned short *)loc = v;
91                         break;
92                 case R_H8_PCREL8:
93                         v -= (unsigned long)loc + 1;
94                         if ((Elf32_Sword)v > 0x7f || 
95                             (Elf32_Sword)v < -(Elf32_Sword)0x80)
96                                 goto overflow;
97                         else 
98                                 *(unsigned char *)loc = v;
99                         break;
100                 default:
101                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
102                                me->name, ELF32_R_TYPE(rela[i].r_info));
103                         return -ENOEXEC;
104                 }
105         }
106         return 0;
107  overflow:
108         printk(KERN_ERR "module %s: relocation offset overflow: %08x\n",
109                me->name, rela[i].r_offset);
110         return -ENOEXEC;
111 }
112
113 int module_finalize(const Elf_Ehdr *hdr,
114                     const Elf_Shdr *sechdrs,
115                     struct module *me)
116 {
117         return module_bug_finalize(hdr, sechdrs, me);
118 }
119
120 void module_arch_cleanup(struct module *mod)
121 {
122         module_bug_cleanup(mod);
123 }