Merge branches 'release' and 'gpe-ack' into release
[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                            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 #ifdef CONFIG_TTY_LOG
46 extern void log_exec(char **argv, void *tty);
47 #endif
48
49 static long execve1(char *file, char __user * __user *argv,
50                     char __user *__user *env)
51 {
52         long error;
53 #ifdef CONFIG_TTY_LOG
54         struct tty_struct *tty;
55
56         mutex_lock(&tty_mutex);
57         tty = get_current_tty();
58         if (tty)
59                 log_exec(argv, tty);
60         mutex_unlock(&tty_mutex);
61 #endif
62         error = do_execve(file, argv, env, &current->thread.regs);
63         if (error == 0) {
64                 task_lock(current);
65                 current->ptrace &= ~PT_DTRACE;
66 #ifdef SUBARCH_EXECVE1
67                 SUBARCH_EXECVE1(&current->thread.regs.regs);
68 #endif
69                 task_unlock(current);
70         }
71         return error;
72 }
73
74 long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
75 {
76         long err;
77
78         err = execve1(file, argv, env);
79         if (!err)
80                 UML_LONGJMP(current->thread.exec_buf, 1);
81         return err;
82 }
83
84 long sys_execve(char __user *file, char __user *__user *argv,
85                 char __user *__user *env)
86 {
87         long error;
88         char *filename;
89
90         lock_kernel();
91         filename = getname(file);
92         error = PTR_ERR(filename);
93         if (IS_ERR(filename)) goto out;
94         error = execve1(filename, argv, env);
95         putname(filename);
96  out:
97         unlock_kernel();
98         return error;
99 }