Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[linux-2.6.git] / arch / unicore32 / kernel / module.c
1 /*
2  * linux/arch/unicore32/kernel/module.c
3  *
4  * Code specific to PKUnity SoC and UniCore ISA
5  *
6  * Copyright (C) 2001-2010 GUAN Xue-tao
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 #include <linux/module.h>
13 #include <linux/moduleloader.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/elf.h>
17 #include <linux/vmalloc.h>
18 #include <linux/fs.h>
19 #include <linux/string.h>
20 #include <linux/gfp.h>
21
22 #include <asm/pgtable.h>
23 #include <asm/sections.h>
24
25 void *module_alloc(unsigned long size)
26 {
27         struct vm_struct *area;
28
29         size = PAGE_ALIGN(size);
30         if (!size)
31                 return NULL;
32
33         area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
34         if (!area)
35                 return NULL;
36
37         return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
38 }
39
40 int
41 apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
42                unsigned int relindex, struct module *module)
43 {
44         Elf32_Shdr *symsec = sechdrs + symindex;
45         Elf32_Shdr *relsec = sechdrs + relindex;
46         Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
47         Elf32_Rel *rel = (void *)relsec->sh_addr;
48         unsigned int i;
49
50         for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
51                 unsigned long loc;
52                 Elf32_Sym *sym;
53                 s32 offset;
54
55                 offset = ELF32_R_SYM(rel->r_info);
56                 if (offset < 0 || offset >
57                                 (symsec->sh_size / sizeof(Elf32_Sym))) {
58                         printk(KERN_ERR "%s: bad relocation, "
59                                         "section %d reloc %d\n",
60                                         module->name, relindex, i);
61                         return -ENOEXEC;
62                 }
63
64                 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
65
66                 if (rel->r_offset < 0 || rel->r_offset >
67                                 dstsec->sh_size - sizeof(u32)) {
68                         printk(KERN_ERR "%s: out of bounds relocation, "
69                                 "section %d reloc %d offset %d size %d\n",
70                                 module->name, relindex, i, rel->r_offset,
71                                 dstsec->sh_size);
72                         return -ENOEXEC;
73                 }
74
75                 loc = dstsec->sh_addr + rel->r_offset;
76
77                 switch (ELF32_R_TYPE(rel->r_info)) {
78                 case R_UNICORE_NONE:
79                         /* ignore */
80                         break;
81
82                 case R_UNICORE_ABS32:
83                         *(u32 *)loc += sym->st_value;
84                         break;
85
86                 case R_UNICORE_PC24:
87                 case R_UNICORE_CALL:
88                 case R_UNICORE_JUMP24:
89                         offset = (*(u32 *)loc & 0x00ffffff) << 2;
90                         if (offset & 0x02000000)
91                                 offset -= 0x04000000;
92
93                         offset += sym->st_value - loc;
94                         if (offset & 3 ||
95                             offset <= (s32)0xfe000000 ||
96                             offset >= (s32)0x02000000) {
97                                 printk(KERN_ERR
98                                        "%s: relocation out of range, section "
99                                        "%d reloc %d sym '%s'\n", module->name,
100                                        relindex, i, strtab + sym->st_name);
101                                 return -ENOEXEC;
102                         }
103
104                         offset >>= 2;
105
106                         *(u32 *)loc &= 0xff000000;
107                         *(u32 *)loc |= offset & 0x00ffffff;
108                         break;
109
110                 default:
111                         printk(KERN_ERR "%s: unknown relocation: %u\n",
112                                module->name, ELF32_R_TYPE(rel->r_info));
113                         return -ENOEXEC;
114                 }
115         }
116         return 0;
117 }