1 /* 2 * arch/xtensa/kernel/syscall.c 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2001 - 2005 Tensilica Inc. 9 * Copyright (C) 2000 Silicon Graphics, Inc. 10 * Copyright (C) 1995 - 2000 by Ralf Baechle 11 * 12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> 13 * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca> 14 * Chris Zankel <chris@zankel.net> 15 * Kevin Chea 16 * 17 */ 18 #include <asm/uaccess.h> 19 #include <asm/syscall.h> 20 #include <asm/unistd.h> 21 #include <linux/linkage.h> 22 #include <linux/stringify.h> 23 #include <linux/errno.h> 24 #include <linux/syscalls.h> 25 #include <linux/file.h> 26 #include <linux/fs.h> 27 #include <linux/mman.h> 28 #include <linux/shm.h> 29 30 typedef void (*syscall_t)(void); 31 32 syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= { 33 [0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall, 34 35 #undef __SYSCALL 36 #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol, 37 #undef _XTENSA_UNISTD_H 38 #undef __KERNEL_SYSCALLS__ 39 #include <asm/unistd.h> 40 }; 41 42 /* 43 * xtensa_pipe() is the normal C calling standard for creating a pipe. It's not 44 * the way unix traditional does this, though. 45 */ 46 47 asmlinkage long xtensa_pipe(int __user *userfds) 48 { 49 int fd[2]; 50 int error; 51 52 error = do_pipe(fd); 53 if (!error) { 54 if (copy_to_user(userfds, fd, 2 * sizeof(int))) 55 error = -EFAULT; 56 } 57 return error; 58 } 59 60 61 asmlinkage long xtensa_mmap2(unsigned long addr, unsigned long len, 62 unsigned long prot, unsigned long flags, 63 unsigned long fd, unsigned long pgoff) 64 { 65 int error = -EBADF; 66 struct file * file = NULL; 67 68 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 69 if (!(flags & MAP_ANONYMOUS)) { 70 file = fget(fd); 71 if (!file) 72 goto out; 73 } 74 75 down_write(¤t->mm->mmap_sem); 76 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 77 up_write(¤t->mm->mmap_sem); 78 79 if (file) 80 fput(file); 81 out: 82 return error; 83 } 84 85 asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg) 86 { 87 unsigned long ret; 88 long err; 89 90 err = do_shmat(shmid, shmaddr, shmflg, &ret); 91 if (err) 92 return err; 93 return (long)ret; 94 } 95 96