arch/powerpc/kernel/module.c

/*  Kernel module help for powerpc.
    Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
    Copyright (C) 2008 Freescale Semiconductor, Inc.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#include <linux/module.h>
#include <linux/elf.h>
#include <linux/moduleloader.h>
#include <linux/err.h>
#include <linux/vmalloc.h>
#include <linux/bug.h>
#include <asm/module.h>
#include <asm/uaccess.h>
#include <asm/firmware.h>
#include <linux/sort.h>

#include "setup.h"

LIST_HEAD(module_bug_list);

void *module_alloc(unsigned long size)
{
	if (size == 0)
		return NULL;

	return vmalloc_exec(size);
}

/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
	vfree(module_region);
	/* FIXME: If module_region == mod->init_region, trim exception
           table entries. */
}

static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
				    const Elf_Shdr *sechdrs,
				    const char *name)
{
	char *secstrings;
	unsigned int i;

	secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
	for (i = 1; i < hdr->e_shnum; i++)
		if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
			return &sechdrs[i];
	return NULL;
}

int module_finalize(const Elf_Ehdr *hdr,
		const Elf_Shdr *sechdrs, struct module *me)
{
	const Elf_Shdr *sect;
	int err;

	err = module_bug_finalize(hdr, sechdrs, me);
	if (err)
		return err;

	/* Apply feature fixups */
	sect = find_section(hdr, sechdrs, "__ftr_fixup");
	if (sect != NULL)
		do_feature_fixups(cur_cpu_spec->cpu_features,
				  (void *)sect->sh_addr,
				  (void *)sect->sh_addr + sect->sh_size);

#ifdef CONFIG_PPC64
	sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
	if (sect != NULL)
		do_feature_fixups(powerpc_firmware_features,
				  (void *)sect->sh_addr,
				  (void *)sect->sh_addr + sect->sh_size);
#endif

	sect = find_section(hdr, sechdrs, "__lwsync_fixup");
	if (sect != NULL)
		do_lwsync_fixups(cur_cpu_spec->cpu_features,
				 (void *)sect->sh_addr,
				 (void *)sect->sh_addr + sect->sh_size);

	return 0;
}

void module_arch_cleanup(struct module *mod)
{
	module_bug_cleanup(mod);
}

struct bug_entry *module_find_bug(unsigned long bugaddr)
{
	struct mod_arch_specific *mod;
	unsigned int i;
	struct bug_entry *bug;

	list_for_each_entry(mod, &module_bug_list, bug_list) {
		bug = mod->bug_table;
		for (i = 0; i < mod->num_bugs; ++i, ++bug)
			if (bugaddr == bug->bug_addr)
				return bug;
	}
	return NULL;
}