1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* arch/score/kernel/syscall.c
*
* Score Processor version.
*
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
* Chen Liqin <liqin.chen@sunplusct.com>
* Lennox Wu <lennox.wu@sunplusct.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/mman.h>
#include <linux/module.h>
#include <linux/unistd.h>
unsigned long shm_align_mask = PAGE_SIZE - 1;
EXPORT_SYMBOL(shm_align_mask);
asmlinkage unsigned long
sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
unsigned long flags, unsigned long fd, unsigned long pgoff)
{
int error = -EBADF;
struct file *file = NULL;
if (pgoff & (~PAGE_MASK >> 12))
return -EINVAL;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
if (!(flags & MAP_ANONYMOUS)) {
file = fget(fd);
if (!file)
return error;
}
down_write(¤t->mm->mmap_sem);
error = do_mmap_pgoff(file, addr, len, prot, flags,
pgoff >> (PAGE_SHIFT - 12));
up_write(¤t->mm->mmap_sem);
if (file)
fput(file);
return error;
}
/*
* Clone a task - this clones the calling program thread.
* This is called indirectly via a small wrapper
*/
int score_clone(struct pt_regs *regs)
{
unsigned long clone_flags;
unsigned long newsp;
int __user *parent_tidptr, *child_tidptr;
clone_flags = regs->regs[4];
newsp = regs->regs[5];
if (!newsp)
newsp = regs->regs[0];
parent_tidptr = (int __user *)regs->regs[6];
child_tidptr = (int __user *)regs->regs[8];
return do_fork(clone_flags, newsp, regs, 0,
parent_tidptr, child_tidptr);
}
/*
* sys_execve() executes a new program.
* This is called indirectly via a small wrapper
*/
int score_execve(struct pt_regs *regs)
{
int error;
char *filename;
filename = getname((char *) (long) regs->regs[4]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename, (char **) (long) regs->regs[5],
(char **) (long) regs->regs[6], regs);
putname(filename);
return error;
}
/*
* If we ever come here the user sp is bad. Zap the process right away.
* Due to the bad stack signaling wouldn't work.
*/
void bad_stack(void)
{
do_exit(SIGSEGV);
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
register unsigned long __r4 asm("r4") = (unsigned long) filename;
register unsigned long __r5 asm("r5") = (unsigned long) argv;
register unsigned long __r6 asm("r6") = (unsigned long) envp;
register unsigned long __r7 asm("r7");
__asm__ __volatile__ (" \n"
"ldi r27, %5 \n"
"syscall \n"
"mv %0, r4 \n"
"mv %1, r7 \n"
: "=&r" (__r4), "=r" (__r7)
: "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
: "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
"r26", "r27", "memory");
if (__r7 == 0)
return __r4;
return -__r4;
}
|
