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/module.h>
 8#include <linux/fs.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	PT_REGS_IP(regs) = eip;
43	PT_REGS_SP(regs) = esp;
44}
45EXPORT_SYMBOL(start_thread);
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	filename = getname(file);
82	error = PTR_ERR(filename);
83	if (IS_ERR(filename)) goto out;
84	error = execve1(filename, argv, env);
85	putname(filename);
86 out:
87	return error;
88}

 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/ptrace.h"
 9#include "linux/sched.h"
10#include "linux/slab.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
20void 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
39void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
40{
41	PT_REGS_IP(regs) = eip;
42	PT_REGS_SP(regs) = esp;
43}
 
44
45static long execve1(const char *file,
46		    const char __user *const __user *argv,
47		    const char __user *const __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
63long um_execve(const char *file, const char __user *const __user *argv, const char __user *const __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
73long sys_execve(const char __user *file, const char __user *const __user *argv,
74		const char __user *const __user *env)
75{
76	long error;
77	char *filename;
78
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	return error;
86}