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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
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/* Kernel module help for x86.
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Copyright (C) 2001 Rusty Russell.
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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <linux/bug.h>
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#include <linux/mm.h>
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#include <asm/system.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt...)
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#endif
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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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/* FIXME: If module_region == mod->init_region, trim exception
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table entries. */
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}
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/* We don't need anything special. */
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int module_frob_arch_sections(Elf_Ehdr *hdr,
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Elf_Shdr *sechdrs,
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char *secstrings,
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struct module *mod)
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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,
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const Elf_Shdr *sechdrs,
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struct module *me)
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{
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const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL,
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*para = NULL;
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char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
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if (!strcmp(".text", secstrings + s->sh_name))
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text = s;
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if (!strcmp(".altinstructions", secstrings + s->sh_name))
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alt = s;
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if (!strcmp(".smp_locks", secstrings + s->sh_name))
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locks = s;
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if (!strcmp(".parainstructions", secstrings + s->sh_name))
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para = s;
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}
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if (alt) {
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/* patch .altinstructions */
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void *aseg = (void *)alt->sh_addr;
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apply_alternatives(aseg, aseg + alt->sh_size);
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}
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if (locks && text) {
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void *lseg = (void *)locks->sh_addr;
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void *tseg = (void *)text->sh_addr;
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alternatives_smp_module_add(me, me->name,
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lseg, lseg + locks->sh_size,
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tseg, tseg + text->sh_size);
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}
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if (para) {
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void *pseg = (void *)para->sh_addr;
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apply_paravirt(pseg, pseg + para->sh_size);
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}
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return module_bug_finalize(hdr, sechdrs, me);
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}
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void module_arch_cleanup(struct module *mod)
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{
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alternatives_smp_module_del(mod);
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module_bug_cleanup(mod);
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}
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