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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 | ||
3b9dc9f2 | 33 | #define DEBUGP(fmt...) |
1da177e4 | 34 | |
23352fc2 | 35 | #ifndef CONFIG_UML |
1da177e4 LT |
36 | void *module_alloc(unsigned long size) |
37 | { | |
38 | struct vm_struct *area; | |
39 | ||
40 | if (!size) | |
41 | return NULL; | |
42 | size = PAGE_ALIGN(size); | |
43 | if (size > MODULES_LEN) | |
44 | return NULL; | |
45 | ||
46 | area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); | |
47 | if (!area) | |
48 | return NULL; | |
49 | ||
50 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC); | |
51 | } | |
23352fc2 | 52 | #endif |
1da177e4 | 53 | |
1da177e4 LT |
54 | int apply_relocate_add(Elf64_Shdr *sechdrs, |
55 | const char *strtab, | |
56 | unsigned int symindex, | |
57 | unsigned int relsec, | |
58 | struct module *me) | |
59 | { | |
60 | unsigned int i; | |
61 | Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
62 | Elf64_Sym *sym; | |
63 | void *loc; | |
3b9dc9f2 | 64 | u64 val; |
1da177e4 LT |
65 | |
66 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
67 | sechdrs[relsec].sh_info); | |
68 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
69 | /* This is where to make the change */ | |
70 | loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
71 | + rel[i].r_offset; | |
72 | ||
73 | /* This is the symbol it is referring to. Note that all | |
74 | undefined symbols have been resolved. */ | |
75 | sym = (Elf64_Sym *)sechdrs[symindex].sh_addr | |
76 | + ELF64_R_SYM(rel[i].r_info); | |
77 | ||
3b9dc9f2 JSR |
78 | DEBUGP("type %d st_value %Lx r_addend %Lx loc %Lx\n", |
79 | (int)ELF64_R_TYPE(rel[i].r_info), | |
80 | sym->st_value, rel[i].r_addend, (u64)loc); | |
1da177e4 | 81 | |
3b9dc9f2 | 82 | val = sym->st_value + rel[i].r_addend; |
1da177e4 LT |
83 | |
84 | switch (ELF64_R_TYPE(rel[i].r_info)) { | |
85 | case R_X86_64_NONE: | |
86 | break; | |
87 | case R_X86_64_64: | |
88 | *(u64 *)loc = val; | |
89 | break; | |
90 | case R_X86_64_32: | |
91 | *(u32 *)loc = val; | |
92 | if (val != *(u32 *)loc) | |
93 | goto overflow; | |
94 | break; | |
95 | case R_X86_64_32S: | |
96 | *(s32 *)loc = val; | |
97 | if ((s64)val != *(s32 *)loc) | |
98 | goto overflow; | |
99 | break; | |
3b9dc9f2 | 100 | case R_X86_64_PC32: |
1da177e4 LT |
101 | val -= (u64)loc; |
102 | *(u32 *)loc = val; | |
103 | #if 0 | |
104 | if ((s64)val != *(s32 *)loc) | |
3b9dc9f2 | 105 | goto overflow; |
1da177e4 LT |
106 | #endif |
107 | break; | |
108 | default: | |
3b9dc9f2 | 109 | printk(KERN_ERR "module %s: Unknown rela relocation: %llu\n", |
1da177e4 LT |
110 | me->name, ELF64_R_TYPE(rel[i].r_info)); |
111 | return -ENOEXEC; | |
112 | } | |
113 | } | |
114 | return 0; | |
115 | ||
116 | overflow: | |
3b9dc9f2 | 117 | printk(KERN_ERR "overflow in relocation type %d val %Lx\n", |
1da177e4 LT |
118 | (int)ELF64_R_TYPE(rel[i].r_info), val); |
119 | printk(KERN_ERR "`%s' likely not compiled with -mcmodel=kernel\n", | |
120 | me->name); | |
121 | return -ENOEXEC; | |
122 | } | |
123 | ||
124 | int apply_relocate(Elf_Shdr *sechdrs, | |
125 | const char *strtab, | |
126 | unsigned int symindex, | |
127 | unsigned int relsec, | |
128 | struct module *me) | |
129 | { | |
3b9dc9f2 | 130 | printk(KERN_ERR "non add relocation not supported\n"); |
1da177e4 | 131 | return -ENOSYS; |
3b9dc9f2 | 132 | } |
1da177e4 | 133 |