Commit | Line | Data |
---|---|---|
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> | |
25 | #include <linux/slab.h> | |
c31a0bf3 | 26 | #include <linux/bug.h> |
1da177e4 LT |
27 | |
28 | #include <asm/system.h> | |
29 | #include <asm/page.h> | |
30 | #include <asm/pgtable.h> | |
31 | ||
32 | #define DEBUGP(fmt...) | |
33 | ||
23352fc2 | 34 | #ifndef CONFIG_UML |
1da177e4 LT |
35 | void module_free(struct module *mod, void *module_region) |
36 | { | |
37 | vfree(module_region); | |
23352fc2 PBG |
38 | /* FIXME: If module_region == mod->init_region, trim exception |
39 | table entries. */ | |
1da177e4 LT |
40 | } |
41 | ||
42 | void *module_alloc(unsigned long size) | |
43 | { | |
44 | struct vm_struct *area; | |
45 | ||
46 | if (!size) | |
47 | return NULL; | |
48 | size = PAGE_ALIGN(size); | |
49 | if (size > MODULES_LEN) | |
50 | return NULL; | |
51 | ||
52 | area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); | |
53 | if (!area) | |
54 | return NULL; | |
55 | ||
56 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC); | |
57 | } | |
23352fc2 | 58 | #endif |
1da177e4 LT |
59 | |
60 | /* We don't need anything special. */ | |
61 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
62 | Elf_Shdr *sechdrs, | |
63 | char *secstrings, | |
64 | struct module *mod) | |
65 | { | |
66 | return 0; | |
67 | } | |
68 | ||
69 | int apply_relocate_add(Elf64_Shdr *sechdrs, | |
70 | const char *strtab, | |
71 | unsigned int symindex, | |
72 | unsigned int relsec, | |
73 | struct module *me) | |
74 | { | |
75 | unsigned int i; | |
76 | Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
77 | Elf64_Sym *sym; | |
78 | void *loc; | |
79 | u64 val; | |
80 | ||
81 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
82 | sechdrs[relsec].sh_info); | |
83 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
84 | /* This is where to make the change */ | |
85 | loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
86 | + rel[i].r_offset; | |
87 | ||
88 | /* This is the symbol it is referring to. Note that all | |
89 | undefined symbols have been resolved. */ | |
90 | sym = (Elf64_Sym *)sechdrs[symindex].sh_addr | |
91 | + ELF64_R_SYM(rel[i].r_info); | |
92 | ||
93 | DEBUGP("type %d st_value %Lx r_addend %Lx loc %Lx\n", | |
94 | (int)ELF64_R_TYPE(rel[i].r_info), | |
95 | sym->st_value, rel[i].r_addend, (u64)loc); | |
96 | ||
97 | val = sym->st_value + rel[i].r_addend; | |
98 | ||
99 | switch (ELF64_R_TYPE(rel[i].r_info)) { | |
100 | case R_X86_64_NONE: | |
101 | break; | |
102 | case R_X86_64_64: | |
103 | *(u64 *)loc = val; | |
104 | break; | |
105 | case R_X86_64_32: | |
106 | *(u32 *)loc = val; | |
107 | if (val != *(u32 *)loc) | |
108 | goto overflow; | |
109 | break; | |
110 | case R_X86_64_32S: | |
111 | *(s32 *)loc = val; | |
112 | if ((s64)val != *(s32 *)loc) | |
113 | goto overflow; | |
114 | break; | |
115 | case R_X86_64_PC32: | |
116 | val -= (u64)loc; | |
117 | *(u32 *)loc = val; | |
118 | #if 0 | |
119 | if ((s64)val != *(s32 *)loc) | |
120 | goto overflow; | |
121 | #endif | |
122 | break; | |
123 | default: | |
124 | printk(KERN_ERR "module %s: Unknown rela relocation: %Lu\n", | |
125 | me->name, ELF64_R_TYPE(rel[i].r_info)); | |
126 | return -ENOEXEC; | |
127 | } | |
128 | } | |
129 | return 0; | |
130 | ||
131 | overflow: | |
132 | printk(KERN_ERR "overflow in relocation type %d val %Lx\n", | |
133 | (int)ELF64_R_TYPE(rel[i].r_info), val); | |
134 | printk(KERN_ERR "`%s' likely not compiled with -mcmodel=kernel\n", | |
135 | me->name); | |
136 | return -ENOEXEC; | |
137 | } | |
138 | ||
139 | int apply_relocate(Elf_Shdr *sechdrs, | |
140 | const char *strtab, | |
141 | unsigned int symindex, | |
142 | unsigned int relsec, | |
143 | struct module *me) | |
144 | { | |
145 | printk("non add relocation not supported\n"); | |
146 | return -ENOSYS; | |
147 | } | |
148 | ||
1da177e4 | 149 | int module_finalize(const Elf_Ehdr *hdr, |
d167a518 GH |
150 | const Elf_Shdr *sechdrs, |
151 | struct module *me) | |
1da177e4 | 152 | { |
d167a518 | 153 | const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL; |
1da177e4 LT |
154 | char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
155 | ||
d167a518 GH |
156 | for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { |
157 | if (!strcmp(".text", secstrings + s->sh_name)) | |
158 | text = s; | |
159 | if (!strcmp(".altinstructions", secstrings + s->sh_name)) | |
160 | alt = s; | |
161 | if (!strcmp(".smp_locks", secstrings + s->sh_name)) | |
162 | locks= s; | |
163 | } | |
164 | ||
165 | if (alt) { | |
166 | /* patch .altinstructions */ | |
167 | void *aseg = (void *)alt->sh_addr; | |
168 | apply_alternatives(aseg, aseg + alt->sh_size); | |
169 | } | |
170 | if (locks && text) { | |
171 | void *lseg = (void *)locks->sh_addr; | |
172 | void *tseg = (void *)text->sh_addr; | |
173 | alternatives_smp_module_add(me, me->name, | |
174 | lseg, lseg + locks->sh_size, | |
175 | tseg, tseg + text->sh_size); | |
176 | } | |
c31a0bf3 JF |
177 | |
178 | return module_bug_finalize(hdr, sechdrs, me); | |
1da177e4 LT |
179 | } |
180 | ||
181 | void module_arch_cleanup(struct module *mod) | |
182 | { | |
d167a518 | 183 | alternatives_smp_module_del(mod); |
c31a0bf3 | 184 | module_bug_cleanup(mod); |
1da177e4 | 185 | } |