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  • only in /asuswrt-rt-n18u-9.0.0.4.380.2695/release/src-rt-6.x.4708/linux/linux-2.6/arch/um/kernel/
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 "linux/slab.h"
12#include "asm/current.h"
13#include "asm/processor.h"
14#include "asm/uaccess.h"
15#include "as-layout.h"
16#include "mem_user.h"
17#include "skas.h"
18#include "os.h"
19#include "internal.h"
20
21void flush_thread(void)
22{
23	void *data = NULL;
24	int ret;
25
26	arch_flush_thread(&current->thread.arch);
27
28	ret = unmap(&current->mm->context.id, 0, STUB_START, 0, &data);
29	ret = ret || unmap(&current->mm->context.id, STUB_END,
30			   host_task_size - STUB_END, 1, &data);
31	if (ret) {
32		printk(KERN_ERR "flush_thread - clearing address space failed, "
33		       "err = %d\n", ret);
34		force_sig(SIGKILL, current);
35	}
36
37	__switch_mm(&current->mm->context.id);
38}
39
40void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
41{
42	set_fs(USER_DS);
43	PT_REGS_IP(regs) = eip;
44	PT_REGS_SP(regs) = esp;
45}
46
47static long execve1(const char *file,
48		    const char __user *const __user *argv,
49		    const char __user *const __user *env)
50{
51	long error;
52
53	error = do_execve(file, argv, env, &current->thread.regs);
54	if (error == 0) {
55		task_lock(current);
56		current->ptrace &= ~PT_DTRACE;
57#ifdef SUBARCH_EXECVE1
58		SUBARCH_EXECVE1(&current->thread.regs.regs);
59#endif
60		task_unlock(current);
61	}
62	return error;
63}
64
65long um_execve(const char *file, const char __user *const __user *argv, const char __user *const __user *env)
66{
67	long err;
68
69	err = execve1(file, argv, env);
70	if (!err)
71		UML_LONGJMP(current->thread.exec_buf, 1);
72	return err;
73}
74
75long sys_execve(const char __user *file, const char __user *const __user *argv,
76		const char __user *const __user *env)
77{
78	long error;
79	char *filename;
80
81	lock_kernel();
82	filename = getname(file);
83	error = PTR_ERR(filename);
84	if (IS_ERR(filename)) goto out;
85	error = execve1(filename, argv, env);
86	putname(filename);
87 out:
88	unlock_kernel();
89	return error;
90}
91