1/*
  2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
  3 *
  4 *   This program is free software; you can redistribute it and/or
  5 *   modify it under the terms of the GNU General Public License
  6 *   as published by the Free Software Foundation, version 2.
  7 *
  8 *   This program is distributed in the hope that it will be useful, but
  9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 11 *   NON INFRINGEMENT.  See the GNU General Public License for
 12 *   more details.
 13 */
 14
 15/* Adjust unistd.h to provide 32-bit numbers and functions. */
 16#define __SYSCALL_COMPAT
 17
 18#include <linux/compat.h>
 19#include <linux/syscalls.h>
 20#include <linux/kdev_t.h>
 21#include <linux/fs.h>
 22#include <linux/fcntl.h>
 23#include <linux/uaccess.h>
 24#include <linux/signal.h>
 25#include <asm/syscalls.h>
 26
 27/*
 28 * Syscalls that take 64-bit numbers traditionally take them in 32-bit
 29 * "high" and "low" value parts on 32-bit architectures.
 30 * In principle, one could imagine passing some register arguments as
 31 * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
 32 * adapt the usual convention.
 33 */
 34
 35long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high)
 36{
 37	return sys_truncate(filename, ((loff_t)high << 32) | low);
 38}
 39
 40long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high)
 41{
 42	return sys_ftruncate(fd, ((loff_t)high << 32) | low);
 43}
 44
 45long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
 46			u32 dummy, u32 low, u32 high)
 47{
 48	return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
 49}
 50
 51long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
 52			 u32 dummy, u32 low, u32 high)
 53{
 54	return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
 55}
 56
 57long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len)
 58{
 59	return sys_lookup_dcookie(((loff_t)high << 32) | low, buf, len);
 60}
 61
 62long compat_sys_sync_file_range2(int fd, unsigned int flags,
 63				 u32 offset_lo, u32 offset_hi,
 64				 u32 nbytes_lo, u32 nbytes_hi)
 65{
 66	return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
 67				   ((loff_t)nbytes_hi << 32) | nbytes_lo,
 68				   flags);
 69}
 70
 71long compat_sys_fallocate(int fd, int mode,
 72			  u32 offset_lo, u32 offset_hi,
 73			  u32 len_lo, u32 len_hi)
 74{
 75	return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
 76			     ((loff_t)len_hi << 32) | len_lo);
 77}
 78
 79
 80
 81long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 82				      struct compat_timespec __user *interval)
 83{
 84	struct timespec t;
 85	int ret;
 86	mm_segment_t old_fs = get_fs();
 87
 88	set_fs(KERNEL_DS);
 89	ret = sys_sched_rr_get_interval(pid,
 90					(struct timespec __force __user *)&t);
 91	set_fs(old_fs);
 92	if (put_compat_timespec(&t, interval))
 93		return -EFAULT;
 94	return ret;
 95}
 96
 97/* Provide the compat syscall number to call mapping. */
 98#undef __SYSCALL
 99#define __SYSCALL(nr, call) [nr] = (call),
100
101/* See comments in sys.c */
102#define compat_sys_fadvise64_64 sys32_fadvise64_64
103#define compat_sys_readahead sys32_readahead
104
105/* Call the trampolines to manage pt_regs where necessary. */
106#define compat_sys_execve _compat_sys_execve
107#define compat_sys_sigaltstack _compat_sys_sigaltstack
108#define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
109#define sys_clone _sys_clone
110
111/*
112 * Note that we can't include <linux/unistd.h> here since the header
113 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
114 */
115void *compat_sys_call_table[__NR_syscalls] = {
116	[0 ... __NR_syscalls-1] = sys_ni_syscall,
117#include <asm/unistd.h>
118};