arch/score/kernel/sys_score.c

   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         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  */
 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 }