Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Kernel module help for sparc32. |
2 | * | |
3 | * Copyright (C) 2001 Rusty Russell. | |
4 | * Copyright (C) 2002 David S. Miller. | |
5 | */ | |
6 | ||
7 | #include <linux/moduleloader.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/elf.h> | |
10 | #include <linux/vmalloc.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/string.h> | |
13 | ||
14 | void *module_alloc(unsigned long size) | |
15 | { | |
16 | void *ret; | |
17 | ||
18 | /* We handle the zero case fine, unlike vmalloc */ | |
19 | if (size == 0) | |
20 | return NULL; | |
21 | ||
22 | ret = vmalloc(size); | |
23 | if (!ret) | |
24 | ret = ERR_PTR(-ENOMEM); | |
25 | else | |
26 | memset(ret, 0, size); | |
27 | ||
28 | return ret; | |
29 | } | |
30 | ||
31 | /* Free memory returned from module_core_alloc/module_init_alloc */ | |
32 | void module_free(struct module *mod, void *module_region) | |
33 | { | |
34 | vfree(module_region); | |
35 | /* FIXME: If module_region == mod->init_region, trim exception | |
36 | table entries. */ | |
37 | } | |
38 | ||
39 | /* Make generic code ignore STT_REGISTER dummy undefined symbols, | |
40 | * and replace references to .func with func as in ppc64's dedotify. | |
41 | */ | |
42 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
43 | Elf_Shdr *sechdrs, | |
44 | char *secstrings, | |
45 | struct module *mod) | |
46 | { | |
47 | unsigned int symidx; | |
48 | Elf32_Sym *sym; | |
49 | char *strtab; | |
50 | int i; | |
51 | ||
52 | for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { | |
53 | if (symidx == hdr->e_shnum-1) { | |
54 | printk("%s: no symtab found.\n", mod->name); | |
55 | return -ENOEXEC; | |
56 | } | |
57 | } | |
58 | sym = (Elf32_Sym *)sechdrs[symidx].sh_addr; | |
59 | strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; | |
60 | ||
61 | for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { | |
62 | if (sym[i].st_shndx == SHN_UNDEF) { | |
63 | if (ELF32_ST_TYPE(sym[i].st_info) == STT_REGISTER) | |
64 | sym[i].st_shndx = SHN_ABS; | |
65 | else { | |
66 | char *name = strtab + sym[i].st_name; | |
67 | if (name[0] == '.') | |
68 | memmove(name, name+1, strlen(name)); | |
69 | } | |
70 | } | |
71 | } | |
72 | return 0; | |
73 | } | |
74 | ||
75 | int apply_relocate(Elf32_Shdr *sechdrs, | |
76 | const char *strtab, | |
77 | unsigned int symindex, | |
78 | unsigned int relsec, | |
79 | struct module *me) | |
80 | { | |
81 | printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n", | |
82 | me->name); | |
83 | return -ENOEXEC; | |
84 | } | |
85 | ||
86 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
87 | const char *strtab, | |
88 | unsigned int symindex, | |
89 | unsigned int relsec, | |
90 | struct module *me) | |
91 | { | |
92 | unsigned int i; | |
93 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
94 | Elf32_Sym *sym; | |
95 | u8 *location; | |
96 | u32 *loc32; | |
97 | ||
98 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
99 | Elf32_Addr v; | |
100 | ||
101 | /* This is where to make the change */ | |
102 | location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
103 | + rel[i].r_offset; | |
104 | loc32 = (u32 *) location; | |
105 | /* This is the symbol it is referring to. Note that all | |
106 | undefined symbols have been resolved. */ | |
107 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
108 | + ELF32_R_SYM(rel[i].r_info); | |
109 | v = sym->st_value + rel[i].r_addend; | |
110 | ||
111 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
112 | case R_SPARC_32: | |
113 | location[0] = v >> 24; | |
114 | location[1] = v >> 16; | |
115 | location[2] = v >> 8; | |
116 | location[3] = v >> 0; | |
117 | break; | |
118 | ||
119 | case R_SPARC_WDISP30: | |
120 | v -= (Elf32_Addr) location; | |
121 | *loc32 = (*loc32 & ~0x3fffffff) | | |
122 | ((v >> 2) & 0x3fffffff); | |
123 | break; | |
124 | ||
125 | case R_SPARC_WDISP22: | |
126 | v -= (Elf32_Addr) location; | |
127 | *loc32 = (*loc32 & ~0x3fffff) | | |
128 | ((v >> 2) & 0x3fffff); | |
129 | break; | |
130 | ||
131 | case R_SPARC_LO10: | |
132 | *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); | |
133 | break; | |
134 | ||
135 | case R_SPARC_HI22: | |
136 | *loc32 = (*loc32 & ~0x3fffff) | | |
137 | ((v >> 10) & 0x3fffff); | |
138 | break; | |
139 | ||
140 | default: | |
141 | printk(KERN_ERR "module %s: Unknown relocation: %x\n", | |
142 | me->name, | |
143 | (int) (ELF32_R_TYPE(rel[i].r_info) & 0xff)); | |
144 | return -ENOEXEC; | |
145 | }; | |
146 | } | |
147 | return 0; | |
148 | } | |
149 | ||
150 | int module_finalize(const Elf_Ehdr *hdr, | |
151 | const Elf_Shdr *sechdrs, | |
152 | struct module *me) | |
153 | { | |
154 | return 0; | |
155 | } | |
156 | ||
157 | void module_arch_cleanup(struct module *mod) | |
158 | { | |
159 | } |