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
module_alloc(unsigned long size)25 void *module_alloc(unsigned long size)
26 {
27 return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
28 GFP_KERNEL, PAGE_KERNEL_EXEC, NUMA_NO_NODE,
29 __builtin_return_address(0));
30 }
31
32 int
apply_relocate(Elf32_Shdr * sechdrs,const char * strtab,unsigned int symindex,unsigned int relindex,struct module * module)33 apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
34 unsigned int relindex, struct module *module)
35 {
36 Elf32_Shdr *symsec = sechdrs + symindex;
37 Elf32_Shdr *relsec = sechdrs + relindex;
38 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
39 Elf32_Rel *rel = (void *)relsec->sh_addr;
40 unsigned int i;
41
42 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
43 unsigned long loc;
44 Elf32_Sym *sym;
45 s32 offset;
46
47 offset = ELF32_R_SYM(rel->r_info);
48 if (offset < 0 || offset >
49 (symsec->sh_size / sizeof(Elf32_Sym))) {
50 printk(KERN_ERR "%s: bad relocation, "
51 "section %d reloc %d\n",
52 module->name, relindex, i);
53 return -ENOEXEC;
54 }
55
56 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
57
58 if (rel->r_offset < 0 || rel->r_offset >
59 dstsec->sh_size - sizeof(u32)) {
60 printk(KERN_ERR "%s: out of bounds relocation, "
61 "section %d reloc %d offset %d size %d\n",
62 module->name, relindex, i, rel->r_offset,
63 dstsec->sh_size);
64 return -ENOEXEC;
65 }
66
67 loc = dstsec->sh_addr + rel->r_offset;
68
69 switch (ELF32_R_TYPE(rel->r_info)) {
70 case R_UNICORE_NONE:
71 /* ignore */
72 break;
73
74 case R_UNICORE_ABS32:
75 *(u32 *)loc += sym->st_value;
76 break;
77
78 case R_UNICORE_PC24:
79 case R_UNICORE_CALL:
80 case R_UNICORE_JUMP24:
81 offset = (*(u32 *)loc & 0x00ffffff) << 2;
82 if (offset & 0x02000000)
83 offset -= 0x04000000;
84
85 offset += sym->st_value - loc;
86 if (offset & 3 ||
87 offset <= (s32)0xfe000000 ||
88 offset >= (s32)0x02000000) {
89 printk(KERN_ERR
90 "%s: relocation out of range, section "
91 "%d reloc %d sym '%s'\n", module->name,
92 relindex, i, strtab + sym->st_name);
93 return -ENOEXEC;
94 }
95
96 offset >>= 2;
97
98 *(u32 *)loc &= 0xff000000;
99 *(u32 *)loc |= offset & 0x00ffffff;
100 break;
101
102 default:
103 printk(KERN_ERR "%s: unknown relocation: %u\n",
104 module->name, ELF32_R_TYPE(rel->r_info));
105 return -ENOEXEC;
106 }
107 }
108 return 0;
109 }
110