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1da177e4 LT |
1 | /* Kernel module help for x86-64 |
2 | Copyright (C) 2001 Rusty Russell. | |
3 | Copyright (C) 2002,2003 Andi Kleen, SuSE Labs. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | #include <linux/moduleloader.h> | |
20 | #include <linux/elf.h> | |
21 | #include <linux/vmalloc.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/kernel.h> | |
27ac792c | 25 | #include <linux/mm.h> |
1da177e4 | 26 | #include <linux/slab.h> |
c31a0bf3 | 27 | #include <linux/bug.h> |
1da177e4 LT |
28 | |
29 | #include <asm/system.h> | |
30 | #include <asm/page.h> | |
31 | #include <asm/pgtable.h> | |
32 | ||
33 | #define DEBUGP(fmt...) | |
34 | ||
23352fc2 | 35 | #ifndef CONFIG_UML |
1da177e4 LT |
36 | void module_free(struct module *mod, void *module_region) |
37 | { | |
38 | vfree(module_region); | |
23352fc2 PBG |
39 | /* FIXME: If module_region == mod->init_region, trim exception |
40 | table entries. */ | |
1da177e4 LT |
41 | } |
42 | ||
43 | void *module_alloc(unsigned long size) | |
44 | { | |
45 | struct vm_struct *area; | |
46 | ||
47 | if (!size) | |
48 | return NULL; | |
49 | size = PAGE_ALIGN(size); | |
50 | if (size > MODULES_LEN) | |
51 | return NULL; | |
52 | ||
53 | area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); | |
54 | if (!area) | |
55 | return NULL; | |
56 | ||
57 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC); | |
58 | } | |
23352fc2 | 59 | #endif |
1da177e4 LT |
60 | |
61 | /* We don't need anything special. */ | |
62 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
63 | Elf_Shdr *sechdrs, | |
64 | char *secstrings, | |
65 | struct module *mod) | |
66 | { | |
67 | return 0; | |
68 | } | |
69 | ||
70 | int apply_relocate_add(Elf64_Shdr *sechdrs, | |
71 | const char *strtab, | |
72 | unsigned int symindex, | |
73 | unsigned int relsec, | |
74 | struct module *me) | |
75 | { | |
76 | unsigned int i; | |
77 | Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
78 | Elf64_Sym *sym; | |
79 | void *loc; | |
80 | u64 val; | |
81 | ||
82 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
83 | sechdrs[relsec].sh_info); | |
84 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
85 | /* This is where to make the change */ | |
86 | loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
87 | + rel[i].r_offset; | |
88 | ||
89 | /* This is the symbol it is referring to. Note that all | |
90 | undefined symbols have been resolved. */ | |
91 | sym = (Elf64_Sym *)sechdrs[symindex].sh_addr | |
92 | + ELF64_R_SYM(rel[i].r_info); | |
93 | ||
94 | DEBUGP("type %d st_value %Lx r_addend %Lx loc %Lx\n", | |
95 | (int)ELF64_R_TYPE(rel[i].r_info), | |
96 | sym->st_value, rel[i].r_addend, (u64)loc); | |
97 | ||
98 | val = sym->st_value + rel[i].r_addend; | |
99 | ||
100 | switch (ELF64_R_TYPE(rel[i].r_info)) { | |
101 | case R_X86_64_NONE: | |
102 | break; | |
103 | case R_X86_64_64: | |
104 | *(u64 *)loc = val; | |
105 | break; | |
106 | case R_X86_64_32: | |
107 | *(u32 *)loc = val; | |
108 | if (val != *(u32 *)loc) | |
109 | goto overflow; | |
110 | break; | |
111 | case R_X86_64_32S: | |
112 | *(s32 *)loc = val; | |
113 | if ((s64)val != *(s32 *)loc) | |
114 | goto overflow; | |
115 | break; | |
116 | case R_X86_64_PC32: | |
117 | val -= (u64)loc; | |
118 | *(u32 *)loc = val; | |
119 | #if 0 | |
120 | if ((s64)val != *(s32 *)loc) | |
121 | goto overflow; | |
122 | #endif | |
123 | break; | |
124 | default: | |
125 | printk(KERN_ERR "module %s: Unknown rela relocation: %Lu\n", | |
126 | me->name, ELF64_R_TYPE(rel[i].r_info)); | |
127 | return -ENOEXEC; | |
128 | } | |
129 | } | |
130 | return 0; | |
131 | ||
132 | overflow: | |
133 | printk(KERN_ERR "overflow in relocation type %d val %Lx\n", | |
134 | (int)ELF64_R_TYPE(rel[i].r_info), val); | |
135 | printk(KERN_ERR "`%s' likely not compiled with -mcmodel=kernel\n", | |
136 | me->name); | |
137 | return -ENOEXEC; | |
138 | } | |
139 | ||
140 | int apply_relocate(Elf_Shdr *sechdrs, | |
141 | const char *strtab, | |
142 | unsigned int symindex, | |
143 | unsigned int relsec, | |
144 | struct module *me) | |
145 | { | |
146 | printk("non add relocation not supported\n"); | |
147 | return -ENOSYS; | |
148 | } | |
149 | ||
1da177e4 | 150 | int module_finalize(const Elf_Ehdr *hdr, |
d167a518 GH |
151 | const Elf_Shdr *sechdrs, |
152 | struct module *me) | |
1da177e4 | 153 | { |
5e5a29bf AK |
154 | const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL, |
155 | *para = NULL; | |
1da177e4 LT |
156 | char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
157 | ||
d167a518 GH |
158 | for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { |
159 | if (!strcmp(".text", secstrings + s->sh_name)) | |
160 | text = s; | |
161 | if (!strcmp(".altinstructions", secstrings + s->sh_name)) | |
162 | alt = s; | |
163 | if (!strcmp(".smp_locks", secstrings + s->sh_name)) | |
164 | locks= s; | |
5e5a29bf AK |
165 | if (!strcmp(".parainstructions", secstrings + s->sh_name)) |
166 | para = s; | |
d167a518 GH |
167 | } |
168 | ||
169 | if (alt) { | |
170 | /* patch .altinstructions */ | |
171 | void *aseg = (void *)alt->sh_addr; | |
172 | apply_alternatives(aseg, aseg + alt->sh_size); | |
173 | } | |
174 | if (locks && text) { | |
175 | void *lseg = (void *)locks->sh_addr; | |
176 | void *tseg = (void *)text->sh_addr; | |
177 | alternatives_smp_module_add(me, me->name, | |
178 | lseg, lseg + locks->sh_size, | |
179 | tseg, tseg + text->sh_size); | |
180 | } | |
c31a0bf3 | 181 | |
5e5a29bf AK |
182 | if (para) { |
183 | void *pseg = (void *)para->sh_addr; | |
184 | apply_paravirt(pseg, pseg + para->sh_size); | |
185 | } | |
186 | ||
c31a0bf3 | 187 | return module_bug_finalize(hdr, sechdrs, me); |
1da177e4 LT |
188 | } |
189 | ||
190 | void module_arch_cleanup(struct module *mod) | |
191 | { | |
d167a518 | 192 | alternatives_smp_module_del(mod); |
c31a0bf3 | 193 | module_bug_cleanup(mod); |
1da177e4 | 194 | } |