Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6] / arch / um / kernel / exec.c
1 /*
2  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3  * Licensed under the GPL
4  */
5
6 #include "linux/stddef.h"
7 #include "linux/fs.h"
8 #include "linux/smp_lock.h"
9 #include "linux/ptrace.h"
10 #include "linux/sched.h"
11 #include "asm/current.h"
12 #include "asm/processor.h"
13 #include "asm/uaccess.h"
14 #include "as-layout.h"
15 #include "mem_user.h"
16 #include "skas.h"
17 #include "os.h"
18
19 void flush_thread(void)
20 {
21         void *data = NULL;
22         int ret;
23
24         arch_flush_thread(&current->thread.arch);
25
26         ret = unmap(&current->mm->context.id, 0, STUB_START, 0, &data);
27         ret = ret || unmap(&current->mm->context.id, STUB_END,
28                            host_task_size - STUB_END, 1, &data);
29         if (ret) {
30                 printk(KERN_ERR "flush_thread - clearing address space failed, "
31                        "err = %d\n", ret);
32                 force_sig(SIGKILL, current);
33         }
34
35         __switch_mm(&current->mm->context.id);
36 }
37
38 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
39 {
40         set_fs(USER_DS);
41         PT_REGS_IP(regs) = eip;
42         PT_REGS_SP(regs) = esp;
43 }
44
45 static long execve1(char *file, char __user * __user *argv,
46                     char __user *__user *env)
47 {
48         long error;
49
50         error = do_execve(file, argv, env, &current->thread.regs);
51         if (error == 0) {
52                 task_lock(current);
53                 current->ptrace &= ~PT_DTRACE;
54 #ifdef SUBARCH_EXECVE1
55                 SUBARCH_EXECVE1(&current->thread.regs.regs);
56 #endif
57                 task_unlock(current);
58         }
59         return error;
60 }
61
62 long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
63 {
64         long err;
65
66         err = execve1(file, argv, env);
67         if (!err)
68                 UML_LONGJMP(current->thread.exec_buf, 1);
69         return err;
70 }
71
72 long sys_execve(char __user *file, char __user *__user *argv,
73                 char __user *__user *env)
74 {
75         long error;
76         char *filename;
77
78         lock_kernel();
79         filename = getname(file);
80         error = PTR_ERR(filename);
81         if (IS_ERR(filename)) goto out;
82         error = execve1(filename, argv, env);
83         putname(filename);
84  out:
85         unlock_kernel();
86         return error;
87 }