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Linux/arch/x86/ia32/sys_ia32.c

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  1 /*
  2  * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
  3  *             sys_sparc32
  4  *
  5  * Copyright (C) 2000           VA Linux Co
  6  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
  7  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
  8  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  9  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
 10  * Copyright (C) 2000           Hewlett-Packard Co.
 11  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
 12  * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
 13  *
 14  * These routines maintain argument size conversion between 32bit and 64bit
 15  * environment. In 2.5 most of this should be moved to a generic directory.
 16  *
 17  * This file assumes that there is a hole at the end of user address space.
 18  *
 19  * Some of the functions are LE specific currently. These are
 20  * hopefully all marked.  This should be fixed.
 21  */
 22 
 23 #include <linux/kernel.h>
 24 #include <linux/sched.h>
 25 #include <linux/fs.h>
 26 #include <linux/file.h>
 27 #include <linux/signal.h>
 28 #include <linux/syscalls.h>
 29 #include <linux/times.h>
 30 #include <linux/utsname.h>
 31 #include <linux/mm.h>
 32 #include <linux/uio.h>
 33 #include <linux/poll.h>
 34 #include <linux/personality.h>
 35 #include <linux/stat.h>
 36 #include <linux/rwsem.h>
 37 #include <linux/compat.h>
 38 #include <linux/vfs.h>
 39 #include <linux/ptrace.h>
 40 #include <linux/highuid.h>
 41 #include <linux/sysctl.h>
 42 #include <linux/slab.h>
 43 #include <asm/mman.h>
 44 #include <asm/types.h>
 45 #include <asm/uaccess.h>
 46 #include <linux/atomic.h>
 47 #include <asm/vgtod.h>
 48 #include <asm/sys_ia32.h>
 49 
 50 #define AA(__x)         ((unsigned long)(__x))
 51 
 52 
 53 asmlinkage long sys32_truncate64(const char __user *filename,
 54                                  unsigned long offset_low,
 55                                  unsigned long offset_high)
 56 {
 57        return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
 58 }
 59 
 60 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low,
 61                                   unsigned long offset_high)
 62 {
 63        return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
 64 }
 65 
 66 /*
 67  * Another set for IA32/LFS -- x86_64 struct stat is different due to
 68  * support for 64bit inode numbers.
 69  */
 70 static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
 71 {
 72         typeof(ubuf->st_uid) uid = 0;
 73         typeof(ubuf->st_gid) gid = 0;
 74         SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
 75         SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
 76         if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
 77             __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
 78             __put_user(stat->ino, &ubuf->__st_ino) ||
 79             __put_user(stat->ino, &ubuf->st_ino) ||
 80             __put_user(stat->mode, &ubuf->st_mode) ||
 81             __put_user(stat->nlink, &ubuf->st_nlink) ||
 82             __put_user(uid, &ubuf->st_uid) ||
 83             __put_user(gid, &ubuf->st_gid) ||
 84             __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
 85             __put_user(stat->size, &ubuf->st_size) ||
 86             __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
 87             __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
 88             __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
 89             __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
 90             __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
 91             __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
 92             __put_user(stat->blksize, &ubuf->st_blksize) ||
 93             __put_user(stat->blocks, &ubuf->st_blocks))
 94                 return -EFAULT;
 95         return 0;
 96 }
 97 
 98 asmlinkage long sys32_stat64(const char __user *filename,
 99                              struct stat64 __user *statbuf)
100 {
101         struct kstat stat;
102         int ret = vfs_stat(filename, &stat);
103 
104         if (!ret)
105                 ret = cp_stat64(statbuf, &stat);
106         return ret;
107 }
108 
109 asmlinkage long sys32_lstat64(const char __user *filename,
110                               struct stat64 __user *statbuf)
111 {
112         struct kstat stat;
113         int ret = vfs_lstat(filename, &stat);
114         if (!ret)
115                 ret = cp_stat64(statbuf, &stat);
116         return ret;
117 }
118 
119 asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
120 {
121         struct kstat stat;
122         int ret = vfs_fstat(fd, &stat);
123         if (!ret)
124                 ret = cp_stat64(statbuf, &stat);
125         return ret;
126 }
127 
128 asmlinkage long sys32_fstatat(unsigned int dfd, const char __user *filename,
129                               struct stat64 __user *statbuf, int flag)
130 {
131         struct kstat stat;
132         int error;
133 
134         error = vfs_fstatat(dfd, filename, &stat, flag);
135         if (error)
136                 return error;
137         return cp_stat64(statbuf, &stat);
138 }
139 
140 /*
141  * Linux/i386 didn't use to be able to handle more than
142  * 4 system call parameters, so these system calls used a memory
143  * block for parameter passing..
144  */
145 
146 struct mmap_arg_struct32 {
147         unsigned int addr;
148         unsigned int len;
149         unsigned int prot;
150         unsigned int flags;
151         unsigned int fd;
152         unsigned int offset;
153 };
154 
155 asmlinkage long sys32_mmap(struct mmap_arg_struct32 __user *arg)
156 {
157         struct mmap_arg_struct32 a;
158 
159         if (copy_from_user(&a, arg, sizeof(a)))
160                 return -EFAULT;
161 
162         if (a.offset & ~PAGE_MASK)
163                 return -EINVAL;
164 
165         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
166                                a.offset>>PAGE_SHIFT);
167 }
168 
169 asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int __user *stat_addr,
170                               int options)
171 {
172         return compat_sys_wait4(pid, stat_addr, options, NULL);
173 }
174 
175 /* warning: next two assume little endian */
176 asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count,
177                             u32 poslo, u32 poshi)
178 {
179         return sys_pread64(fd, ubuf, count,
180                          ((loff_t)AA(poshi) << 32) | AA(poslo));
181 }
182 
183 asmlinkage long sys32_pwrite(unsigned int fd, const char __user *ubuf,
184                              u32 count, u32 poslo, u32 poshi)
185 {
186         return sys_pwrite64(fd, ubuf, count,
187                           ((loff_t)AA(poshi) << 32) | AA(poslo));
188 }
189 
190 
191 /*
192  * Some system calls that need sign extended arguments. This could be
193  * done by a generic wrapper.
194  */
195 long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
196                         __u32 len_low, __u32 len_high, int advice)
197 {
198         return sys_fadvise64_64(fd,
199                                (((u64)offset_high)<<32) | offset_low,
200                                (((u64)len_high)<<32) | len_low,
201                                 advice);
202 }
203 
204 asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
205                                    size_t count)
206 {
207         return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
208 }
209 
210 asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
211                                       unsigned n_low, unsigned n_hi,  int flags)
212 {
213         return sys_sync_file_range(fd,
214                                    ((u64)off_hi << 32) | off_low,
215                                    ((u64)n_hi << 32) | n_low, flags);
216 }
217 
218 asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi,
219                                 size_t len, int advice)
220 {
221         return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
222                                 len, advice);
223 }
224 
225 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
226                                 unsigned offset_hi, unsigned len_lo,
227                                 unsigned len_hi)
228 {
229         return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
230                              ((u64)len_hi << 32) | len_lo);
231 }
232 

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