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	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
32int
33apply_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