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