2 * arch/score/kernel/syscall.c
4 * Score Processor version.
6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
7 * Chen Liqin <liqin.chen@sunplusct.com>
8 * Lennox Wu <lennox.wu@sunplusct.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see the file COPYING, or write
22 * to the Free Software Foundation, Inc.,
23 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <linux/file.h>
28 #include <linux/mman.h>
29 #include <linux/module.h>
30 #include <linux/unistd.h>
32 unsigned long shm_align_mask
= PAGE_SIZE
- 1;
33 EXPORT_SYMBOL(shm_align_mask
);
35 asmlinkage
unsigned long
36 sys_mmap2(unsigned long addr
, unsigned long len
, unsigned long prot
,
37 unsigned long flags
, unsigned long fd
, unsigned long pgoff
)
40 struct file
*file
= NULL
;
42 if (pgoff
& (~PAGE_MASK
>> 12))
45 flags
&= ~(MAP_EXECUTABLE
| MAP_DENYWRITE
);
46 if (!(flags
& MAP_ANONYMOUS
)) {
52 down_write(¤t
->mm
->mmap_sem
);
53 error
= do_mmap_pgoff(file
, addr
, len
, prot
, flags
,
54 pgoff
>> (PAGE_SHIFT
- 12));
55 up_write(¤t
->mm
->mmap_sem
);
64 * Clone a task - this clones the calling program thread.
65 * This is called indirectly via a small wrapper
68 score_clone(struct pt_regs
*regs
)
70 unsigned long clone_flags
;
72 int __user
*parent_tidptr
, *child_tidptr
;
74 clone_flags
= regs
->regs
[4];
75 newsp
= regs
->regs
[5];
77 newsp
= regs
->regs
[0];
78 parent_tidptr
= (int __user
*)regs
->regs
[6];
81 if (clone_flags
& (CLONE_CHILD_SETTID
| CLONE_CHILD_CLEARTID
)) {
82 int __user
*__user
*usp
= (int __user
*__user
*)regs
->regs
[0];
84 if (get_user(child_tidptr
, &usp
[4]))
88 return do_fork(clone_flags
, newsp
, regs
, 0,
89 parent_tidptr
, child_tidptr
);
93 * sys_execve() executes a new program.
94 * This is called indirectly via a small wrapper
96 asmlinkage
int score_execve(struct pt_regs
*regs
)
101 filename
= getname((char *) (long) regs
->regs
[4]);
102 error
= PTR_ERR(filename
);
103 if (IS_ERR(filename
))
106 error
= do_execve(filename
, (char **) (long) regs
->regs
[5],
107 (char **) (long) regs
->regs
[6], regs
);
114 * If we ever come here the user sp is bad. Zap the process right away.
115 * Due to the bad stack signaling wouldn't work.
117 asmlinkage
void bad_stack(void)
123 * Do a system call from kernel instead of calling sys_execve so we
124 * end up with proper pt_regs.
126 int kernel_execve(const char *filename
, char *const argv
[], char *const envp
[])
128 register unsigned long __r4
asm("r4") = (unsigned long) filename
;
129 register unsigned long __r5
asm("r5") = (unsigned long) argv
;
130 register unsigned long __r6
asm("r6") = (unsigned long) envp
;
131 register unsigned long __r7
asm("r7");
133 __asm__
__volatile__ (" \n"
138 : "=&r" (__r4
), "=r" (__r7
)
139 : "r" (__r4
), "r" (__r5
), "r" (__r6
), "i" (__NR_execve
)
140 : "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
141 "r26", "r27", "memory");