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/*

 *  linux/fs/binfmt_em86.c

 *

 *  Based on linux/fs/binfmt_script.c

 *  Copyright (C) 1996  Martin von Löwis

 *  original #!-checking implemented by tytso.

 *

 *  em86 changes Copyright (C) 1997  Jim Paradis

 */

#include <linux/module.h>

#include <linux/string.h>

#include <linux/stat.h>

#include <linux/slab.h>

#include <linux/locks.h>

#include <linux/smp_lock.h>

#include <linux/binfmts.h>

#include <linux/elf.h>

#include <linux/init.h>

#include <linux/file.h>

#define EM86_INTERP     "/usr/bin/em86"

#define EM86_I_NAME     "em86"

static int load_em86(struct linux_binprm *bprm,struct pt_regs *regs)

{

        char *interp, *i_name, *i_arg;

        struct file * file;

        int retval;

        struct elfhdr   elf_ex;

        /* Make sure this is a Linux/Intel ELF executable... */

        elf_ex = *((struct elfhdr *)bprm->buf);

        if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)

                return  -ENOEXEC;

        /* First of all, some simple consistency checks */

        if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||

                (!((elf_ex.e_machine == EM_386) || (elf_ex.e_machine == EM_486))) ||

                (!bprm->file->f_op || !bprm->file->f_op->mmap)) {

                        return -ENOEXEC;

        }

        bprm->sh_bang++;        /* Well, the bang-shell is implicit... */

        allow_write_access(bprm->file);

        fput(bprm->file);

        bprm->file = NULL;

        /* Unlike in the script case, we don't have to do any hairy

         * parsing to find our interpreter... it's hardcoded!

         */

        interp = EM86_INTERP;

        i_name = EM86_I_NAME;

        i_arg = NULL;           /* We reserve the right to add an arg later */

        /*

         * Splice in (1) the interpreter's name for argv[0]

         *           (2) (optional) argument to interpreter

         *           (3) filename of emulated file (replace argv[0])

         *

         * This is done in reverse order, because of how the

         * user environment and arguments are stored.

         */

        remove_arg_zero(bprm);

        retval = copy_strings_kernel(1, &bprm->filename, bprm);

        if (retval < 0) return retval;

        bprm->argc++;

        if (i_arg) {

                retval = copy_strings_kernel(1, &i_arg, bprm);

                if (retval < 0) return retval;

                bprm->argc++;

        }

        retval = copy_strings_kernel(1, &i_name, bprm);

        if (retval < 0)  return retval;

        bprm->argc++;

        /*

         * OK, now restart the process with the interpreter's inode.

         * Note that we use open_exec() as the name is now in kernel

         * space, and we don't need to copy it.

         */

        file = open_exec(interp);

        if (IS_ERR(file))

                return PTR_ERR(file);

        bprm->file = file;

        retval = prepare_binprm(bprm);

        if (retval < 0)

                return retval;

        return search_binary_handler(bprm, regs);

}

struct linux_binfmt em86_format = {

        NULL, THIS_MODULE, load_em86, NULL, NULL, 0

};

static int __init init_em86_binfmt(void)

{

        return register_binfmt(&em86_format);

}

static void __exit exit_em86_binfmt(void)

{

        unregister_binfmt(&em86_format);

}

module_init(init_em86_binfmt)

module_exit(exit_em86_binfmt)

MODULE_LICENSE("GPL");