2 * linux/fs/binfmt_em86.c
4 * Based on linux/fs/binfmt_script.c
5 * Copyright (C) 1996 Martin von Löwis
6 * original #!-checking implemented by tytso.
8 * em86 changes Copyright (C) 1997 Jim Paradis
11 #include <linux/module.h>
12 #include <linux/string.h>
13 #include <linux/stat.h>
14 #include <linux/binfmts.h>
15 #include <linux/elf.h>
16 #include <linux/init.h>
18 #include <linux/file.h>
19 #include <linux/errno.h>
22 #define EM86_INTERP "/usr/bin/em86"
23 #define EM86_I_NAME "em86"
25 static int load_em86(struct linux_binprm
*bprm
,struct pt_regs
*regs
)
27 char *interp
, *i_name
, *i_arg
;
32 /* Make sure this is a Linux/Intel ELF executable... */
33 elf_ex
= *((struct elfhdr
*)bprm
->buf
);
35 if (memcmp(elf_ex
.e_ident
, ELFMAG
, SELFMAG
) != 0)
38 /* First of all, some simple consistency checks */
39 if ((elf_ex
.e_type
!= ET_EXEC
&& elf_ex
.e_type
!= ET_DYN
) ||
40 (!((elf_ex
.e_machine
== EM_386
) || (elf_ex
.e_machine
== EM_486
))) ||
41 (!bprm
->file
->f_op
|| !bprm
->file
->f_op
->mmap
)) {
45 bprm
->recursion_depth
++; /* Well, the bang-shell is implicit... */
46 allow_write_access(bprm
->file
);
50 /* Unlike in the script case, we don't have to do any hairy
51 * parsing to find our interpreter... it's hardcoded!
55 i_arg
= NULL
; /* We reserve the right to add an arg later */
58 * Splice in (1) the interpreter's name for argv[0]
59 * (2) (optional) argument to interpreter
60 * (3) filename of emulated file (replace argv[0])
62 * This is done in reverse order, because of how the
63 * user environment and arguments are stored.
65 remove_arg_zero(bprm
);
66 retval
= copy_strings_kernel(1, &bprm
->filename
, bprm
);
67 if (retval
< 0) return retval
;
70 retval
= copy_strings_kernel(1, &i_arg
, bprm
);
71 if (retval
< 0) return retval
;
74 retval
= copy_strings_kernel(1, &i_name
, bprm
);
75 if (retval
< 0) return retval
;
79 * OK, now restart the process with the interpreter's inode.
80 * Note that we use open_exec() as the name is now in kernel
81 * space, and we don't need to copy it.
83 file
= open_exec(interp
);
89 retval
= prepare_binprm(bprm
);
93 return search_binary_handler(bprm
, regs
);
96 static struct linux_binfmt em86_format
= {
97 .module
= THIS_MODULE
,
98 .load_binary
= load_em86
,
101 static int __init
init_em86_binfmt(void)
103 return register_binfmt(&em86_format
);
106 static void __exit
exit_em86_binfmt(void)
108 unregister_binfmt(&em86_format
);
111 core_initcall(init_em86_binfmt
);
112 module_exit(exit_em86_binfmt
);
113 MODULE_LICENSE("GPL");
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