/* * linux/arch/unicore32/kernel/module.c * * Code specific to PKUnity SoC and UniCore ISA * * Copyright (C) 2001-2010 GUAN Xue-tao * * 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. */ #include <linux/module.h> #include <linux/moduleloader.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/elf.h> #include <linux/vmalloc.h> #include <linux/fs.h> #include <linux/string.h> #include <linux/gfp.h> #include <asm/pgtable.h> #include <asm/sections.h> void *module_alloc(unsigned long size) { return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE, __builtin_return_address(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_UNICORE_NONE: /* ignore */ break; case R_UNICORE_ABS32: *(u32 *)loc += sym->st_value; break; case R_UNICORE_PC24: case R_UNICORE_CALL: case R_UNICORE_JUMP24: offset = (*(u32 *)loc & 0x00ffffff) << 2; if (offset & 0x02000000) offset -= 0x04000000; offset += sym->st_value - loc; if (offset & 3 || offset <= (s32)0xfe000000 || offset >= (s32)0x02000000) { 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; }