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137 lines
3.4 KiB
137 lines
3.4 KiB
/* |
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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 <[email protected]> |
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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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