Merge branches 'core/debug', 'core/futexes', 'core/locking', 'core/rcu', 'core/signal...
[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 #include "internal.h"
19
20 void flush_thread(void)
21 {
22         void *data = NULL;
23         int ret;
24
25         arch_flush_thread(&current->thread.arch);
26
27         ret = unmap(&current->mm->context.id, 0, STUB_START, 0, &data);
28         ret = ret || unmap(&current->mm->context.id, STUB_END,
29                            host_task_size - STUB_END, 1, &data);
30         if (ret) {
31                 printk(KERN_ERR "flush_thread - clearing address space failed, "
32                        "err = %d\n", ret);
33                 force_sig(SIGKILL, current);
34         }
35
36         __switch_mm(&current->mm->context.id);
37 }
38
39 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
40 {
41         set_fs(USER_DS);
42         PT_REGS_IP(regs) = eip;
43         PT_REGS_SP(regs) = esp;
44 }
45
46 static long execve1(char *file, char __user * __user *argv,
47                     char __user *__user *env)
48 {
49         long error;
50
51         error = do_execve(file, argv, env, &current->thread.regs);
52         if (error == 0) {
53                 task_lock(current);
54                 current->ptrace &= ~PT_DTRACE;
55 #ifdef SUBARCH_EXECVE1
56                 SUBARCH_EXECVE1(&current->thread.regs.regs);
57 #endif
58                 task_unlock(current);
59         }
60         return error;
61 }
62
63 long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
64 {
65         long err;
66
67         err = execve1(file, argv, env);
68         if (!err)
69                 UML_LONGJMP(current->thread.exec_buf, 1);
70         return err;
71 }
72
73 long sys_execve(char __user *file, char __user *__user *argv,
74                 char __user *__user *env)
75 {
76         long error;
77         char *filename;
78
79         lock_kernel();
80         filename = getname(file);
81         error = PTR_ERR(filename);
82         if (IS_ERR(filename)) goto out;
83         error = execve1(filename, argv, env);
84         putname(filename);
85  out:
86         unlock_kernel();
87         return error;
88 }