diff options
Diffstat (limited to 'arch/arm/kernel/module.c')
| -rw-r--r-- | arch/arm/kernel/module.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c new file mode 100644 index 000000000000..1a85cfdad5ac --- /dev/null +++ b/arch/arm/kernel/module.c @@ -0,0 +1,152 @@ +/* + * linux/arch/arm/kernel/module.c + * + * Copyright (C) 2002 Russell King. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Module allocation method suggested by Andi Kleen. + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/elf.h> +#include <linux/vmalloc.h> +#include <linux/slab.h> +#include <linux/fs.h> +#include <linux/string.h> + +#include <asm/pgtable.h> + +#ifdef CONFIG_XIP_KERNEL +/* + * The XIP kernel text is mapped in the module area for modules and + * some other stuff to work without any indirect relocations. + * MODULE_START is redefined here and not in asm/memory.h to avoid + * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. + */ +extern void _etext; +#undef MODULE_START +#define MODULE_START (((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK) +#endif + +void *module_alloc(unsigned long size) +{ + struct vm_struct *area; + + size = PAGE_ALIGN(size); + if (!size) + return NULL; + + area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END); + if (!area) + return NULL; + + return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); +} + +void module_free(struct module *module, void *region) +{ + vfree(region); +} + +int module_frob_arch_sections(Elf_Ehdr *hdr, + Elf_Shdr *sechdrs, + char *secstrings, + struct module *mod) +{ + return 0; +} + +int +apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, + unsigned int relindex, struct module *module) +{ + Elf32_Shdr *symsec = sechdrs + symindex; + Elf32_Shdr *relsec = sechdrs + relindex; + Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; + Elf32_Rel *rel = (void *)relsec->sh_addr; + unsigned int i; + + for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { + unsigned long loc; + Elf32_Sym *sym; + s32 offset; + + offset = ELF32_R_SYM(rel->r_info); + if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { + printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", + module->name, relindex, i); + return -ENOEXEC; + } + + sym = ((Elf32_Sym *)symsec->sh_addr) + offset; + + if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { + printk(KERN_ERR "%s: out of bounds relocation, " + "section %d reloc %d offset %d size %d\n", + module->name, relindex, i, rel->r_offset, + dstsec->sh_size); + return -ENOEXEC; + } + + loc = dstsec->sh_addr + rel->r_offset; + + switch (ELF32_R_TYPE(rel->r_info)) { + case R_ARM_ABS32: + *(u32 *)loc += sym->st_value; + break; + + case R_ARM_PC24: + offset = (*(u32 *)loc & 0x00ffffff) << 2; + if (offset & 0x02000000) + offset -= 0x04000000; + + offset += sym->st_value - loc; + if (offset & 3 || + offset <= (s32)0xfc000000 || + offset >= (s32)0x04000000) { + printk(KERN_ERR + "%s: relocation out of range, section " + "%d reloc %d sym '%s'\n", module->name, + relindex, i, strtab + sym->st_name); + return -ENOEXEC; + } + + offset >>= 2; + + *(u32 *)loc &= 0xff000000; + *(u32 *)loc |= offset & 0x00ffffff; + break; + + default: + printk(KERN_ERR "%s: unknown relocation: %u\n", + module->name, ELF32_R_TYPE(rel->r_info)); + return -ENOEXEC; + } + } + return 0; +} + +int +apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, struct module *module) +{ + printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n", + module->name); + return -ENOEXEC; +} + +int +module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, + struct module *module) +{ + return 0; +} + +void +module_arch_cleanup(struct module *mod) +{ +} |