1 /*
2 * arch/score/kernel/syscall.c
3 *
4 * Score Processor version.
5 *
6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
7 * Chen Liqin <liqin.chen@sunplusct.com>
8 * Lennox Wu <lennox.wu@sunplusct.com>
9 *
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.
14 *
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.
19 *
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
24 */
25
26 #include <linux/file.h>
27 #include <linux/fs.h>
28 #include <linux/mm.h>
29 #include <linux/mman.h>
30 #include <linux/module.h>
31 #include <linux/slab.h>
32 #include <linux/unistd.h>
33 #include <linux/syscalls.h>
34 #include <asm/syscalls.h>
35
36 asmlinkage long
sys_mmap2(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long pgoff)37 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
38 unsigned long flags, unsigned long fd, unsigned long pgoff)
39 {
40 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
41 }
42
43 asmlinkage long
sys_mmap(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,off_t offset)44 sys_mmap(unsigned long addr, unsigned long len, unsigned long prot,
45 unsigned long flags, unsigned long fd, off_t offset)
46 {
47 if (unlikely(offset & ~PAGE_MASK))
48 return -EINVAL;
49 return sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
50 }
51
52 asmlinkage long
score_fork(struct pt_regs * regs)53 score_fork(struct pt_regs *regs)
54 {
55 return do_fork(SIGCHLD, regs->regs[0], regs, 0, NULL, NULL);
56 }
57
58 /*
59 * Clone a task - this clones the calling program thread.
60 * This is called indirectly via a small wrapper
61 */
62 asmlinkage long
score_clone(struct pt_regs * regs)63 score_clone(struct pt_regs *regs)
64 {
65 unsigned long clone_flags;
66 unsigned long newsp;
67 int __user *parent_tidptr, *child_tidptr;
68
69 clone_flags = regs->regs[4];
70 newsp = regs->regs[5];
71 if (!newsp)
72 newsp = regs->regs[0];
73 parent_tidptr = (int __user *)regs->regs[6];
74 child_tidptr = (int __user *)regs->regs[8];
75
76 return do_fork(clone_flags, newsp, regs, 0,
77 parent_tidptr, child_tidptr);
78 }
79
80 asmlinkage long
score_vfork(struct pt_regs * regs)81 score_vfork(struct pt_regs *regs)
82 {
83 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
84 regs->regs[0], regs, 0, NULL, NULL);
85 }
86
87 /*
88 * sys_execve() executes a new program.
89 * This is called indirectly via a small wrapper
90 */
91 asmlinkage long
score_execve(struct pt_regs * regs)92 score_execve(struct pt_regs *regs)
93 {
94 int error;
95 char *filename;
96
97 filename = getname((char __user*)regs->regs[4]);
98 error = PTR_ERR(filename);
99 if (IS_ERR(filename))
100 return error;
101
102 error = do_execve(filename,
103 (const char __user *const __user *)regs->regs[5],
104 (const char __user *const __user *)regs->regs[6],
105 regs);
106
107 putname(filename);
108 return error;
109 }
110
111 /*
112 * Do a system call from kernel instead of calling sys_execve so we
113 * end up with proper pt_regs.
114 */
kernel_execve(const char * filename,const char * const argv[],const char * const envp[])115 int kernel_execve(const char *filename,
116 const char *const argv[],
117 const char *const envp[])
118 {
119 register unsigned long __r4 asm("r4") = (unsigned long) filename;
120 register unsigned long __r5 asm("r5") = (unsigned long) argv;
121 register unsigned long __r6 asm("r6") = (unsigned long) envp;
122 register unsigned long __r7 asm("r7");
123
124 __asm__ __volatile__ (" \n"
125 "ldi r27, %5 \n"
126 "syscall \n"
127 "mv %0, r4 \n"
128 "mv %1, r7 \n"
129 : "=&r" (__r4), "=r" (__r7)
130 : "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
131 : "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
132 "r26", "r27", "memory");
133
134 if (__r7 == 0)
135 return __r4;
136
137 return -__r4;
138 }
139