1 files changed, 115 insertions, 0 deletions
diff --git a/fs/binfmt_em86.c b/fs/binfmt_em86.c
new file mode 100644
index 0000000..1f2d1ad
--- /dev/null
+++ b/fs/binfmt_em86.c
@@ -0,0 +1,115 @@
+/*
+ *  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/smp_lock.h>
+#include <linux/binfmts.h>
+#include <linux/elf.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/errno.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);
+}
+
+static struct linux_binfmt em86_format = {
+	.module		= THIS_MODULE,
+	.load_binary	= load_em86,
+};
+
+static int __init init_em86_binfmt(void)
+{
+	return register_binfmt(&em86_format);
+}
+
+static void __exit exit_em86_binfmt(void)
+{
+	unregister_binfmt(&em86_format);
+}
+
+core_initcall(init_em86_binfmt);
+module_exit(exit_em86_binfmt);
+MODULE_LICENSE("GPL");