/arch/unicore32/kernel/module.c
C | 152 lines | 117 code | 23 blank | 12 comment | 10 complexity | 5568f205a525e224acc3c435d681b2e1 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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 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 40void module_free(struct module *module, void *region) 41{ 42 vfree(region); 43} 44 45int module_frob_arch_sections(Elf_Ehdr *hdr, 46 Elf_Shdr *sechdrs, 47 char *secstrings, 48 struct module *mod) 49{ 50 return 0; 51} 52 53int 54apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, 55 unsigned int relindex, struct module *module) 56{ 57 Elf32_Shdr *symsec = sechdrs + symindex; 58 Elf32_Shdr *relsec = sechdrs + relindex; 59 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; 60 Elf32_Rel *rel = (void *)relsec->sh_addr; 61 unsigned int i; 62 63 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { 64 unsigned long loc; 65 Elf32_Sym *sym; 66 s32 offset; 67 68 offset = ELF32_R_SYM(rel->r_info); 69 if (offset < 0 || offset > 70 (symsec->sh_size / sizeof(Elf32_Sym))) { 71 printk(KERN_ERR "%s: bad relocation, " 72 "section %d reloc %d\n", 73 module->name, relindex, i); 74 return -ENOEXEC; 75 } 76 77 sym = ((Elf32_Sym *)symsec->sh_addr) + offset; 78 79 if (rel->r_offset < 0 || rel->r_offset > 80 dstsec->sh_size - sizeof(u32)) { 81 printk(KERN_ERR "%s: out of bounds relocation, " 82 "section %d reloc %d offset %d size %d\n", 83 module->name, relindex, i, rel->r_offset, 84 dstsec->sh_size); 85 return -ENOEXEC; 86 } 87 88 loc = dstsec->sh_addr + rel->r_offset; 89 90 switch (ELF32_R_TYPE(rel->r_info)) { 91 case R_UNICORE_NONE: 92 /* ignore */ 93 break; 94 95 case R_UNICORE_ABS32: 96 *(u32 *)loc += sym->st_value; 97 break; 98 99 case R_UNICORE_PC24: 100 case R_UNICORE_CALL: 101 case R_UNICORE_JUMP24: 102 offset = (*(u32 *)loc & 0x00ffffff) << 2; 103 if (offset & 0x02000000) 104 offset -= 0x04000000; 105 106 offset += sym->st_value - loc; 107 if (offset & 3 || 108 offset <= (s32)0xfe000000 || 109 offset >= (s32)0x02000000) { 110 printk(KERN_ERR 111 "%s: relocation out of range, section " 112 "%d reloc %d sym '%s'\n", module->name, 113 relindex, i, strtab + sym->st_name); 114 return -ENOEXEC; 115 } 116 117 offset >>= 2; 118 119 *(u32 *)loc &= 0xff000000; 120 *(u32 *)loc |= offset & 0x00ffffff; 121 break; 122 123 default: 124 printk(KERN_ERR "%s: unknown relocation: %u\n", 125 module->name, ELF32_R_TYPE(rel->r_info)); 126 return -ENOEXEC; 127 } 128 } 129 return 0; 130} 131 132int 133apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, 134 unsigned int symindex, unsigned int relsec, 135 struct module *module) 136{ 137 printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n", 138 module->name); 139 return -ENOEXEC; 140} 141 142int 143module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, 144 struct module *module) 145{ 146 return 0; 147} 148 149void 150module_arch_cleanup(struct module *mod) 151{ 152}