Linux kernel mirror (for testing)
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linux
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/msg.h>
20#include <linux/syscalls.h>
21#include <linux/kdev_t.h>
22#include <linux/fs.h>
23#include <linux/fcntl.h>
24#include <linux/uaccess.h>
25#include <linux/signal.h>
26#include <asm/syscalls.h>
27
28/*
29 * Syscalls that take 64-bit numbers traditionally take them in 32-bit
30 * "high" and "low" value parts on 32-bit architectures.
31 * In principle, one could imagine passing some register arguments as
32 * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
33 * adapt the usual convention.
34 */
35
36long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high)
37{
38 return sys_truncate(filename, ((loff_t)high << 32) | low);
39}
40
41long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high)
42{
43 return sys_ftruncate(fd, ((loff_t)high << 32) | low);
44}
45
46long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
47 u32 dummy, u32 low, u32 high)
48{
49 return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
50}
51
52long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
53 u32 dummy, u32 low, u32 high)
54{
55 return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
56}
57
58long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len)
59{
60 return sys_lookup_dcookie(((loff_t)high << 32) | low, buf, len);
61}
62
63long compat_sys_sync_file_range2(int fd, unsigned int flags,
64 u32 offset_lo, u32 offset_hi,
65 u32 nbytes_lo, u32 nbytes_hi)
66{
67 return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
68 ((loff_t)nbytes_hi << 32) | nbytes_lo,
69 flags);
70}
71
72long compat_sys_fallocate(int fd, int mode,
73 u32 offset_lo, u32 offset_hi,
74 u32 len_lo, u32 len_hi)
75{
76 return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
77 ((loff_t)len_hi << 32) | len_lo);
78}
79
80
81
82long compat_sys_sched_rr_get_interval(compat_pid_t pid,
83 struct compat_timespec __user *interval)
84{
85 struct timespec t;
86 int ret;
87 mm_segment_t old_fs = get_fs();
88
89 set_fs(KERNEL_DS);
90 ret = sys_sched_rr_get_interval(pid,
91 (struct timespec __force __user *)&t);
92 set_fs(old_fs);
93 if (put_compat_timespec(&t, interval))
94 return -EFAULT;
95 return ret;
96}
97
98/*
99 * The usual compat_sys_msgsnd() and _msgrcv() seem to be assuming
100 * some different calling convention than our normal 32-bit tile code.
101 */
102
103/* Already defined in ipc/compat.c, but we need it here. */
104struct compat_msgbuf {
105 compat_long_t mtype;
106 char mtext[1];
107};
108
109long tile_compat_sys_msgsnd(int msqid,
110 struct compat_msgbuf __user *msgp,
111 size_t msgsz, int msgflg)
112{
113 compat_long_t mtype;
114
115 if (get_user(mtype, &msgp->mtype))
116 return -EFAULT;
117 return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
118}
119
120long tile_compat_sys_msgrcv(int msqid,
121 struct compat_msgbuf __user *msgp,
122 size_t msgsz, long msgtyp, int msgflg)
123{
124 long err, mtype;
125
126 err = do_msgrcv(msqid, &mtype, msgp->mtext, msgsz, msgtyp, msgflg);
127 if (err < 0)
128 goto out;
129
130 if (put_user(mtype, &msgp->mtype))
131 err = -EFAULT;
132 out:
133 return err;
134}
135
136/* Provide the compat syscall number to call mapping. */
137#undef __SYSCALL
138#define __SYSCALL(nr, call) [nr] = (call),
139
140/* The generic versions of these don't work for Tile. */
141#define compat_sys_msgrcv tile_compat_sys_msgrcv
142#define compat_sys_msgsnd tile_compat_sys_msgsnd
143
144/* See comments in sys.c */
145#define compat_sys_fadvise64_64 sys32_fadvise64_64
146#define compat_sys_readahead sys32_readahead
147
148/* Call the trampolines to manage pt_regs where necessary. */
149#define compat_sys_execve _compat_sys_execve
150#define compat_sys_sigaltstack _compat_sys_sigaltstack
151#define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
152#define sys_clone _sys_clone
153
154/*
155 * Note that we can't include <linux/unistd.h> here since the header
156 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
157 */
158void *compat_sys_call_table[__NR_syscalls] = {
159 [0 ... __NR_syscalls-1] = sys_ni_syscall,
160#include <asm/unistd.h>
161};