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Linux/arch/score/kernel/sys_score.c

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  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 
 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
 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
 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
 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
 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
 92 score_execve(struct pt_regs *regs)
 93 {
 94         int error;
 95         struct filename *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->name,
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  */
115 asmlinkage
116 int kernel_execve(const char *filename,
117                   const char *const argv[],
118                   const char *const envp[])
119 {
120         register unsigned long __r4 asm("r4") = (unsigned long) filename;
121         register unsigned long __r5 asm("r5") = (unsigned long) argv;
122         register unsigned long __r6 asm("r6") = (unsigned long) envp;
123         register unsigned long __r7 asm("r7");
124 
125         __asm__ __volatile__ (" \n"
126                 "ldi    r27, %5         \n"
127                 "syscall                \n"
128                 "mv     %0, r4          \n"
129                 "mv     %1, r7          \n"
130                 : "=&r" (__r4), "=r" (__r7)
131                 : "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
132                 : "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
133                   "r26", "r27", "memory");
134 
135         if (__r7 == 0)
136                 return __r4;
137 
138         return -__r4;
139 }
140 

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