Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
25void *module_alloc(unsigned long size)
26{
27 struct vm_struct *area;
28
29 size = PAGE_ALIGN(size);
30 area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
31 if (!area)
32 return NULL;
33
34 return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
35}
36
37int
38apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
39 unsigned int relindex, struct module *module)
40{
41 Elf32_Shdr *symsec = sechdrs + symindex;
42 Elf32_Shdr *relsec = sechdrs + relindex;
43 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
44 Elf32_Rel *rel = (void *)relsec->sh_addr;
45 unsigned int i;
46
47 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
48 unsigned long loc;
49 Elf32_Sym *sym;
50 s32 offset;
51
52 offset = ELF32_R_SYM(rel->r_info);
53 if (offset < 0 || offset >
54 (symsec->sh_size / sizeof(Elf32_Sym))) {
55 printk(KERN_ERR "%s: bad relocation, "
56 "section %d reloc %d\n",
57 module->name, relindex, i);
58 return -ENOEXEC;
59 }
60
61 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
62
63 if (rel->r_offset < 0 || rel->r_offset >
64 dstsec->sh_size - sizeof(u32)) {
65 printk(KERN_ERR "%s: out of bounds relocation, "
66 "section %d reloc %d offset %d size %d\n",
67 module->name, relindex, i, rel->r_offset,
68 dstsec->sh_size);
69 return -ENOEXEC;
70 }
71
72 loc = dstsec->sh_addr + rel->r_offset;
73
74 switch (ELF32_R_TYPE(rel->r_info)) {
75 case R_UNICORE_NONE:
76 /* ignore */
77 break;
78
79 case R_UNICORE_ABS32:
80 *(u32 *)loc += sym->st_value;
81 break;
82
83 case R_UNICORE_PC24:
84 case R_UNICORE_CALL:
85 case R_UNICORE_JUMP24:
86 offset = (*(u32 *)loc & 0x00ffffff) << 2;
87 if (offset & 0x02000000)
88 offset -= 0x04000000;
89
90 offset += sym->st_value - loc;
91 if (offset & 3 ||
92 offset <= (s32)0xfe000000 ||
93 offset >= (s32)0x02000000) {
94 printk(KERN_ERR
95 "%s: relocation out of range, section "
96 "%d reloc %d sym '%s'\n", module->name,
97 relindex, i, strtab + sym->st_name);
98 return -ENOEXEC;
99 }
100
101 offset >>= 2;
102
103 *(u32 *)loc &= 0xff000000;
104 *(u32 *)loc |= offset & 0x00ffffff;
105 break;
106
107 default:
108 printk(KERN_ERR "%s: unknown relocation: %u\n",
109 module->name, ELF32_R_TYPE(rel->r_info));
110 return -ENOEXEC;
111 }
112 }
113 return 0;
114}