138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
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* Kernel module support for Nios II.
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*
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* Copyright (C) 2004 Microtronix Datacom Ltd.
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* Written by Wentao Xu <xuwentao@microtronix.com>
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* Copyright (C) 2001, 2003 Rusty Russell
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*/
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <asm/cacheflush.h>
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/*
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* Modules should NOT be allocated with kmalloc for (obvious) reasons.
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* But we do it for now to avoid relocation issues. CALL26/PCREL26 cannot reach
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* from 0x80000000 (vmalloc area) to 0xc00000000 (kernel) (kmalloc returns
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* addresses in 0xc0000000)
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*/
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void *module_alloc(unsigned long size)
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{
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if (size == 0)
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return NULL;
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return kmalloc(size, GFP_KERNEL);
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}
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/* Free memory returned from module_alloc */
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void module_memfree(void *module_region)
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{
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kfree(module_region);
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}
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int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec,
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struct module *mod)
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{
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unsigned int i;
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Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
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pr_debug("Applying relocate section %u to %u\n", relsec,
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sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
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/* This is where to make the change */
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uint32_t word;
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uint32_t *loc
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= ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rela[i].r_offset);
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/* This is the symbol it is referring to. Note that all
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undefined symbols have been resolved. */
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Elf32_Sym *sym
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= ((Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rela[i].r_info));
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uint32_t v = sym->st_value + rela[i].r_addend;
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pr_debug("reltype %d 0x%x name:<%s>\n",
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ELF32_R_TYPE(rela[i].r_info),
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rela[i].r_offset, strtab + sym->st_name);
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switch (ELF32_R_TYPE(rela[i].r_info)) {
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case R_NIOS2_NONE:
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break;
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case R_NIOS2_BFD_RELOC_32:
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*loc += v;
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break;
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case R_NIOS2_PCREL16:
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v -= (uint32_t)loc + 4;
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if ((int32_t)v > 0x7fff ||
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(int32_t)v < -(int32_t)0x8000) {
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pr_err("module %s: relocation overflow\n",
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mod->name);
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return -ENOEXEC;
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}
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word = *loc;
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*loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
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(word & 0x3f);
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break;
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case R_NIOS2_CALL26:
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if (v & 3) {
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pr_err("module %s: dangerous relocation\n",
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mod->name);
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return -ENOEXEC;
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}
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if ((v >> 28) != ((uint32_t)loc >> 28)) {
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pr_err("module %s: relocation overflow\n",
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mod->name);
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return -ENOEXEC;
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}
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*loc = (*loc & 0x3f) | ((v >> 2) << 6);
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break;
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case R_NIOS2_HI16:
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word = *loc;
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*loc = ((((word >> 22) << 16) |
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((v >> 16) & 0xffff)) << 6) | (word & 0x3f);
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break;
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case R_NIOS2_LO16:
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word = *loc;
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*loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
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(word & 0x3f);
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break;
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case R_NIOS2_HIADJ16:
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{
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Elf32_Addr word2;
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word = *loc;
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word2 = ((v >> 16) + ((v >> 15) & 1)) & 0xffff;
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*loc = ((((word >> 22) << 16) | word2) << 6) |
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(word & 0x3f);
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}
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break;
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default:
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pr_err("module %s: Unknown reloc: %u\n",
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mod->name, ELF32_R_TYPE(rela[i].r_info));
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return -ENOEXEC;
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}
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}
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return 0;
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}
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int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
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struct module *me)
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{
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flush_cache_all();
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return 0;
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}
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