Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*  Kernel module help for i386.

    Copyright (C) 2001 Rusty Russell.

    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/moduleloader.h>

#include <linux/elf.h>

#include <linux/vmalloc.h>

#include <linux/fs.h>

#include <linux/string.h>

#include <linux/kernel.h>

#include <linux/bug.h>

#if 0

#define DEBUGP printk

#else

#define DEBUGP(fmt...)

#endif

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. */

}

/* We don't need anything special. */

int module_frob_arch_sections(Elf_Ehdr *hdr,

                              Elf_Shdr *sechdrs,

                              char *secstrings,

                              struct module *mod)

{

        return 0;

}

int apply_relocate(Elf32_Shdr *sechdrs,

                   const char *strtab,

                   unsigned int symindex,

                   unsigned int relsec,

                   struct module *me)

{

        unsigned int i;

        Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;

        Elf32_Sym *sym;

        uint32_t *location;

        DEBUGP("Applying relocate section %u to %u\n", relsec,

               sechdrs[relsec].sh_info);

        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {

                /* This is where to make the change */

                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr

                        + rel[i].r_offset;

                /* This is the symbol it is referring to.  Note that all

                   undefined symbols have been resolved.  */

                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr

                        + ELF32_R_SYM(rel[i].r_info);

                switch (ELF32_R_TYPE(rel[i].r_info)) {

                case R_386_32:

                        /* We add the value into the location given */

                        *location += sym->st_value;

                        break;

                case R_386_PC32:

                        /* Add the value, subtract its postition */

                        *location += sym->st_value - (uint32_t)location;

                        break;

                default:

                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",

                               me->name, ELF32_R_TYPE(rel[i].r_info));

                        return -ENOEXEC;

                }

        }

        return 0;

}

int apply_relocate_add(Elf32_Shdr *sechdrs,

                       const char *strtab,

                       unsigned int symindex,

                       unsigned int relsec,

                       struct module *me)

{

        printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",

               me->name);

        return -ENOEXEC;

}

int module_finalize(const Elf_Ehdr *hdr,

                    const Elf_Shdr *sechdrs,

                    struct module *me)

{

        const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL,

                *para = NULL;

        char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;

        for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {

                if (!strcmp(".text", secstrings + s->sh_name))

                        text = s;

                if (!strcmp(".altinstructions", secstrings + s->sh_name))

                        alt = s;

                if (!strcmp(".smp_locks", secstrings + s->sh_name))

                        locks= s;

                if (!strcmp(".parainstructions", secstrings + s->sh_name))

                        para = s;

        }

        if (alt) {

                /* patch .altinstructions */

                void *aseg = (void *)alt->sh_addr;

                apply_alternatives(aseg, aseg + alt->sh_size);

        }

        if (locks && text) {

                void *lseg = (void *)locks->sh_addr;

                void *tseg = (void *)text->sh_addr;

                alternatives_smp_module_add(me, me->name,

                                            lseg, lseg + locks->sh_size,

                                            tseg, tseg + text->sh_size);

        }

        if (para) {

                void *pseg = (void *)para->sh_addr;

                apply_paravirt(pseg, pseg + para->sh_size);

        }

        return module_bug_finalize(hdr, sechdrs, me);

}

void module_arch_cleanup(struct module *mod)

{

        alternatives_smp_module_del(mod);

        module_bug_cleanup(mod);

}