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22532578ee
All kernel modules are required to be built with -mlong-calls and thus should not generate any of these relocations. If they do, it means the module has not been compiled properly, so rather than trying to handle them (and running into random run time errors) just error out on module load to force the module to be compiled correctly. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
338 lines
10 KiB
C
338 lines
10 KiB
C
/*
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* File: arch/blackfin/kernel/module.c
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* Based on:
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* Author:
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*
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* Created:
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* Description:
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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/vmalloc.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/dma.h>
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#include <asm/cacheflush.h>
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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 vmalloc(size);
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}
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/* Free memory returned from module_alloc */
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void module_free(struct module *mod, void *module_region)
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{
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vfree(module_region);
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}
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/* Transfer the section to the L1 memory */
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int
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module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs,
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char *secstrings, struct module *mod)
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{
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/*
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* XXX: sechdrs are vmalloced in kernel/module.c
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* and would be vfreed just after module is loaded,
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* so we hack to keep the only information we needed
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* in mod->arch to correctly free L1 I/D sram later.
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* NOTE: this breaks the semantic of mod->arch structure.
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*/
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Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
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void *dest = NULL;
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for (s = sechdrs; s < sechdrs_end; ++s) {
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if ((strcmp(".l1.text", secstrings + s->sh_name) == 0) ||
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((strcmp(".text", secstrings + s->sh_name) == 0) &&
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(hdr->e_flags & EF_BFIN_CODE_IN_L1) && (s->sh_size > 0))) {
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dest = l1_inst_sram_alloc(s->sh_size);
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mod->arch.text_l1 = dest;
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if (dest == NULL) {
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printk(KERN_ERR
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"module %s: L1 instruction memory allocation failed\n",
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mod->name);
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return -1;
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}
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dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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if ((strcmp(".l1.data", secstrings + s->sh_name) == 0) ||
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((strcmp(".data", secstrings + s->sh_name) == 0) &&
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(hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) {
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dest = l1_data_sram_alloc(s->sh_size);
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mod->arch.data_a_l1 = dest;
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if (dest == NULL) {
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printk(KERN_ERR
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"module %s: L1 data memory allocation failed\n",
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mod->name);
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return -1;
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}
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memcpy(dest, (void *)s->sh_addr, s->sh_size);
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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if (strcmp(".l1.bss", secstrings + s->sh_name) == 0 ||
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((strcmp(".bss", secstrings + s->sh_name) == 0) &&
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(hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) {
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dest = l1_data_sram_alloc(s->sh_size);
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mod->arch.bss_a_l1 = dest;
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if (dest == NULL) {
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printk(KERN_ERR
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"module %s: L1 data memory allocation failed\n",
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mod->name);
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return -1;
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}
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memset(dest, 0, s->sh_size);
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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if (strcmp(".l1.data.B", secstrings + s->sh_name) == 0) {
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dest = l1_data_B_sram_alloc(s->sh_size);
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mod->arch.data_b_l1 = dest;
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if (dest == NULL) {
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printk(KERN_ERR
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"module %s: L1 data memory allocation failed\n",
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mod->name);
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return -1;
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}
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memcpy(dest, (void *)s->sh_addr, s->sh_size);
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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if (strcmp(".l1.bss.B", secstrings + s->sh_name) == 0) {
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dest = l1_data_B_sram_alloc(s->sh_size);
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mod->arch.bss_b_l1 = dest;
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if (dest == NULL) {
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printk(KERN_ERR
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"module %s: L1 data memory allocation failed\n",
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mod->name);
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return -1;
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}
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memset(dest, 0, s->sh_size);
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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if ((strcmp(".l2.text", secstrings + s->sh_name) == 0) ||
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((strcmp(".text", secstrings + s->sh_name) == 0) &&
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(hdr->e_flags & EF_BFIN_CODE_IN_L2) && (s->sh_size > 0))) {
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dest = l2_sram_alloc(s->sh_size);
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mod->arch.text_l2 = dest;
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if (dest == NULL) {
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printk(KERN_ERR
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"module %s: L2 SRAM allocation failed\n",
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mod->name);
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return -1;
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}
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memcpy(dest, (void *)s->sh_addr, s->sh_size);
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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if ((strcmp(".l2.data", secstrings + s->sh_name) == 0) ||
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((strcmp(".data", secstrings + s->sh_name) == 0) &&
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(hdr->e_flags & EF_BFIN_DATA_IN_L2) && (s->sh_size > 0))) {
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dest = l2_sram_alloc(s->sh_size);
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mod->arch.data_l2 = dest;
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if (dest == NULL) {
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printk(KERN_ERR
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"module %s: L2 SRAM allocation failed\n",
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mod->name);
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return -1;
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}
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memcpy(dest, (void *)s->sh_addr, s->sh_size);
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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if (strcmp(".l2.bss", secstrings + s->sh_name) == 0 ||
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((strcmp(".bss", secstrings + s->sh_name) == 0) &&
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(hdr->e_flags & EF_BFIN_DATA_IN_L2) && (s->sh_size > 0))) {
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dest = l2_sram_alloc(s->sh_size);
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mod->arch.bss_l2 = dest;
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if (dest == NULL) {
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printk(KERN_ERR
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"module %s: L2 SRAM allocation failed\n",
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mod->name);
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return -1;
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}
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memset(dest, 0, s->sh_size);
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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}
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return 0;
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}
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int
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apply_relocate(Elf_Shdr * sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec, struct module *me)
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{
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printk(KERN_ERR "module %s: .rel unsupported\n", me->name);
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return -ENOEXEC;
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}
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/*************************************************************************/
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/* FUNCTION : apply_relocate_add */
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/* ABSTRACT : Blackfin specific relocation handling for the loadable */
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/* modules. Modules are expected to be .o files. */
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/* Arithmetic relocations are handled. */
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/* We do not expect LSETUP to be split and hence is not */
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/* handled. */
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/* R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the */
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/* gas does not generate it. */
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/*************************************************************************/
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int
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apply_relocate_add(Elf_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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unsigned short tmp;
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Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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uint32_t *location32;
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uint16_t *location16;
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uint32_t value;
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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(*rel); i++) {
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/* This is where to make the change */
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location16 =
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(uint16_t *) (sechdrs[sechdrs[relsec].sh_info].sh_addr +
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rel[i].r_offset);
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location32 = (uint32_t *) location16;
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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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sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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value = sym->st_value;
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value += rel[i].r_addend;
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pr_debug("location is %x, value is %x type is %d \n",
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(unsigned int) location32, value,
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ELF32_R_TYPE(rel[i].r_info));
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#ifdef CONFIG_SMP
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if ((unsigned long)location16 >= COREB_L1_DATA_A_START) {
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printk(KERN_ERR "module %s: cannot relocate in L1: %u (SMP kernel)",
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mod->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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#endif
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_BFIN_LUIMM16:
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pr_debug("before %x after %x\n", *location16,
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(value & 0xffff));
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tmp = (value & 0xffff);
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if ((unsigned long)location16 >= L1_CODE_START) {
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dma_memcpy(location16, &tmp, 2);
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} else
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*location16 = tmp;
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break;
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case R_BFIN_HUIMM16:
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pr_debug("before %x after %x\n", *location16,
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((value >> 16) & 0xffff));
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tmp = ((value >> 16) & 0xffff);
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if ((unsigned long)location16 >= L1_CODE_START) {
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dma_memcpy(location16, &tmp, 2);
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} else
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*location16 = tmp;
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break;
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case R_BFIN_RIMM16:
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*location16 = (value & 0xffff);
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break;
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case R_BFIN_BYTE4_DATA:
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pr_debug("before %x after %x\n", *location32, value);
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*location32 = value;
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break;
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case R_BFIN_PCREL24:
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case R_BFIN_PCREL24_JUMP_L:
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case R_BFIN_PCREL12_JUMP:
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case R_BFIN_PCREL12_JUMP_S:
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case R_BFIN_PCREL10:
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printk(KERN_ERR "module %s: Unsupported relocation: %u (no -mlong-calls?)\n"
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mod->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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default:
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printk(KERN_ERR "module %s: Unknown relocation: %u\n",
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mod->name, ELF32_R_TYPE(rel[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
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module_finalize(const Elf_Ehdr * hdr,
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const Elf_Shdr * sechdrs, struct module *mod)
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{
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unsigned int i, strindex = 0, symindex = 0;
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char *secstrings;
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long err = 0;
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secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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for (i = 1; i < hdr->e_shnum; i++) {
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/* Internal symbols and strings. */
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if (sechdrs[i].sh_type == SHT_SYMTAB) {
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symindex = i;
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strindex = sechdrs[i].sh_link;
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}
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}
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for (i = 1; i < hdr->e_shnum; i++) {
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const char *strtab = (char *)sechdrs[strindex].sh_addr;
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unsigned int info = sechdrs[i].sh_info;
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/* Not a valid relocation section? */
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if (info >= hdr->e_shnum)
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continue;
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if ((sechdrs[i].sh_type == SHT_RELA) &&
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((strcmp(".rela.l2.text", secstrings + sechdrs[i].sh_name) == 0) ||
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(strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0) ||
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((strcmp(".rela.text", secstrings + sechdrs[i].sh_name) == 0) &&
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(hdr->e_flags & (EF_BFIN_CODE_IN_L1|EF_BFIN_CODE_IN_L2))))) {
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err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
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symindex, i, mod);
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if (err < 0)
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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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void module_arch_cleanup(struct module *mod)
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{
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l1_inst_sram_free(mod->arch.text_l1);
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l1_data_A_sram_free(mod->arch.data_a_l1);
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l1_data_A_sram_free(mod->arch.bss_a_l1);
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l1_data_B_sram_free(mod->arch.data_b_l1);
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l1_data_B_sram_free(mod->arch.bss_b_l1);
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l2_sram_free(mod->arch.text_l2);
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l2_sram_free(mod->arch.data_l2);
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l2_sram_free(mod->arch.bss_l2);
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}
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