ia64/linux-2.6.18-xen.hg

view fs/binfmt_em86.c @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /*
2 * linux/fs/binfmt_em86.c
3 *
4 * Based on linux/fs/binfmt_script.c
5 * Copyright (C) 1996 Martin von L÷wis
6 * original #!-checking implemented by tytso.
7 *
8 * em86 changes Copyright (C) 1997 Jim Paradis
9 */
11 #include <linux/module.h>
12 #include <linux/string.h>
13 #include <linux/stat.h>
14 #include <linux/slab.h>
15 #include <linux/smp_lock.h>
16 #include <linux/binfmts.h>
17 #include <linux/elf.h>
18 #include <linux/init.h>
19 #include <linux/fs.h>
20 #include <linux/file.h>
21 #include <linux/errno.h>
24 #define EM86_INTERP "/usr/bin/em86"
25 #define EM86_I_NAME "em86"
27 static int load_em86(struct linux_binprm *bprm,struct pt_regs *regs)
28 {
29 char *interp, *i_name, *i_arg;
30 struct file * file;
31 int retval;
32 struct elfhdr elf_ex;
34 /* Make sure this is a Linux/Intel ELF executable... */
35 elf_ex = *((struct elfhdr *)bprm->buf);
37 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
38 return -ENOEXEC;
40 /* First of all, some simple consistency checks */
41 if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
42 (!((elf_ex.e_machine == EM_386) || (elf_ex.e_machine == EM_486))) ||
43 (!bprm->file->f_op || !bprm->file->f_op->mmap)) {
44 return -ENOEXEC;
45 }
47 bprm->sh_bang++; /* Well, the bang-shell is implicit... */
48 allow_write_access(bprm->file);
49 fput(bprm->file);
50 bprm->file = NULL;
52 /* Unlike in the script case, we don't have to do any hairy
53 * parsing to find our interpreter... it's hardcoded!
54 */
55 interp = EM86_INTERP;
56 i_name = EM86_I_NAME;
57 i_arg = NULL; /* We reserve the right to add an arg later */
59 /*
60 * Splice in (1) the interpreter's name for argv[0]
61 * (2) (optional) argument to interpreter
62 * (3) filename of emulated file (replace argv[0])
63 *
64 * This is done in reverse order, because of how the
65 * user environment and arguments are stored.
66 */
67 remove_arg_zero(bprm);
68 retval = copy_strings_kernel(1, &bprm->filename, bprm);
69 if (retval < 0) return retval;
70 bprm->argc++;
71 if (i_arg) {
72 retval = copy_strings_kernel(1, &i_arg, bprm);
73 if (retval < 0) return retval;
74 bprm->argc++;
75 }
76 retval = copy_strings_kernel(1, &i_name, bprm);
77 if (retval < 0) return retval;
78 bprm->argc++;
80 /*
81 * OK, now restart the process with the interpreter's inode.
82 * Note that we use open_exec() as the name is now in kernel
83 * space, and we don't need to copy it.
84 */
85 file = open_exec(interp);
86 if (IS_ERR(file))
87 return PTR_ERR(file);
89 bprm->file = file;
91 retval = prepare_binprm(bprm);
92 if (retval < 0)
93 return retval;
95 return search_binary_handler(bprm, regs);
96 }
98 static struct linux_binfmt em86_format = {
99 .module = THIS_MODULE,
100 .load_binary = load_em86,
101 };
103 static int __init init_em86_binfmt(void)
104 {
105 return register_binfmt(&em86_format);
106 }
108 static void __exit exit_em86_binfmt(void)
109 {
110 unregister_binfmt(&em86_format);
111 }
113 core_initcall(init_em86_binfmt);
114 module_exit(exit_em86_binfmt);
115 MODULE_LICENSE("GPL");