2 * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
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)
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.
17 * This file assumes that there is a hole at the end of user address space.
19 * Some of the functions are LE specific currently. These are
20 * hopefully all marked. This should be fixed.
23 #include <linux/kernel.h>
24 #include <linux/sched.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>
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>
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>
50 #define AA(__x) ((unsigned long)(__x))
53 asmlinkage long sys32_truncate64(const char __user *filename,
54 unsigned long offset_low,
55 unsigned long offset_high)
57 return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
60 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low,
61 unsigned long offset_high)
63 return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
67 * Another set for IA32/LFS -- x86_64 struct stat is different due to
68 * support for 64bit inode numbers.
70 static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
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))
98 asmlinkage long sys32_stat64(const char __user *filename,
99 struct stat64 __user *statbuf)
102 int ret = vfs_stat(filename, &stat);
105 ret = cp_stat64(statbuf, &stat);
109 asmlinkage long sys32_lstat64(const char __user *filename,
110 struct stat64 __user *statbuf)
113 int ret = vfs_lstat(filename, &stat);
115 ret = cp_stat64(statbuf, &stat);
119 asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
122 int ret = vfs_fstat(fd, &stat);
124 ret = cp_stat64(statbuf, &stat);
128 asmlinkage long sys32_fstatat(unsigned int dfd, const char __user *filename,
129 struct stat64 __user *statbuf, int flag)
134 error = vfs_fstatat(dfd, filename, &stat, flag);
137 return cp_stat64(statbuf, &stat);
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..
146 struct mmap_arg_struct32 {
155 asmlinkage long sys32_mmap(struct mmap_arg_struct32 __user *arg)
157 struct mmap_arg_struct32 a;
159 if (copy_from_user(&a, arg, sizeof(a)))
162 if (a.offset & ~PAGE_MASK)
165 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
166 a.offset>>PAGE_SHIFT);
169 asmlinkage long sys32_mprotect(unsigned long start, size_t len,
172 return sys_mprotect(start, len, prot);
175 asmlinkage long sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
176 struct sigaction32 __user *oact,
177 unsigned int sigsetsize)
179 struct k_sigaction new_ka, old_ka;
181 compat_sigset_t set32;
183 /* XXX: Don't preclude handling different sized sigset_t's. */
184 if (sigsetsize != sizeof(compat_sigset_t))
188 compat_uptr_t handler, restorer;
190 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
191 __get_user(handler, &act->sa_handler) ||
192 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
193 __get_user(restorer, &act->sa_restorer) ||
194 __copy_from_user(&set32, &act->sa_mask,
195 sizeof(compat_sigset_t)))
197 new_ka.sa.sa_handler = compat_ptr(handler);
198 new_ka.sa.sa_restorer = compat_ptr(restorer);
201 * FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
202 * than _NSIG_WORDS << 1
204 switch (_NSIG_WORDS) {
205 case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
206 | (((long)set32.sig[7]) << 32);
207 case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
208 | (((long)set32.sig[5]) << 32);
209 case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
210 | (((long)set32.sig[3]) << 32);
211 case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
212 | (((long)set32.sig[1]) << 32);
216 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
220 * FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
221 * than _NSIG_WORDS << 1
223 switch (_NSIG_WORDS) {
225 set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
226 set32.sig[6] = old_ka.sa.sa_mask.sig[3];
228 set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
229 set32.sig[4] = old_ka.sa.sa_mask.sig[2];
231 set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
232 set32.sig[2] = old_ka.sa.sa_mask.sig[1];
234 set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
235 set32.sig[0] = old_ka.sa.sa_mask.sig[0];
237 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
238 __put_user(ptr_to_compat(old_ka.sa.sa_handler),
239 &oact->sa_handler) ||
240 __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
241 &oact->sa_restorer) ||
242 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
243 __copy_to_user(&oact->sa_mask, &set32,
244 sizeof(compat_sigset_t)))
251 asmlinkage long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
252 struct old_sigaction32 __user *oact)
254 struct k_sigaction new_ka, old_ka;
258 compat_old_sigset_t mask;
259 compat_uptr_t handler, restorer;
261 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
262 __get_user(handler, &act->sa_handler) ||
263 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
264 __get_user(restorer, &act->sa_restorer) ||
265 __get_user(mask, &act->sa_mask))
268 new_ka.sa.sa_handler = compat_ptr(handler);
269 new_ka.sa.sa_restorer = compat_ptr(restorer);
271 siginitset(&new_ka.sa.sa_mask, mask);
274 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
277 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
278 __put_user(ptr_to_compat(old_ka.sa.sa_handler),
279 &oact->sa_handler) ||
280 __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
281 &oact->sa_restorer) ||
282 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
283 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
290 asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int *stat_addr,
293 return compat_sys_wait4(pid, stat_addr, options, NULL);
296 /* 32-bit timeval and related flotsam. */
298 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
299 struct compat_timespec __user *interval)
303 mm_segment_t old_fs = get_fs();
306 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
308 if (put_compat_timespec(&t, interval))
313 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
314 compat_size_t sigsetsize)
319 mm_segment_t old_fs = get_fs();
322 ret = sys_rt_sigpending((sigset_t __user *)&s, sigsetsize);
325 switch (_NSIG_WORDS) {
326 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
327 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
328 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
329 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
331 if (copy_to_user(set, &s32, sizeof(compat_sigset_t)))
337 asmlinkage long sys32_rt_sigqueueinfo(int pid, int sig,
338 compat_siginfo_t __user *uinfo)
342 mm_segment_t old_fs = get_fs();
344 if (copy_siginfo_from_user32(&info, uinfo))
347 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
352 /* warning: next two assume little endian */
353 asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count,
354 u32 poslo, u32 poshi)
356 return sys_pread64(fd, ubuf, count,
357 ((loff_t)AA(poshi) << 32) | AA(poslo));
360 asmlinkage long sys32_pwrite(unsigned int fd, const char __user *ubuf,
361 u32 count, u32 poslo, u32 poshi)
363 return sys_pwrite64(fd, ubuf, count,
364 ((loff_t)AA(poshi) << 32) | AA(poslo));
368 asmlinkage long sys32_sendfile(int out_fd, int in_fd,
369 compat_off_t __user *offset, s32 count)
371 mm_segment_t old_fs = get_fs();
375 if (offset && get_user(of, offset))
379 ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
383 if (offset && put_user(of, offset))
388 asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
389 compat_uptr_t __user *envp, struct pt_regs *regs)
394 filename = getname(name);
395 error = PTR_ERR(filename);
396 if (IS_ERR(filename))
398 error = compat_do_execve(filename, argv, envp, regs);
403 asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp,
404 struct pt_regs *regs)
406 void __user *parent_tid = (void __user *)regs->dx;
407 void __user *child_tid = (void __user *)regs->di;
411 return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
415 * Some system calls that need sign extended arguments. This could be
416 * done by a generic wrapper.
418 long sys32_lseek(unsigned int fd, int offset, unsigned int whence)
420 return sys_lseek(fd, offset, whence);
423 long sys32_kill(int pid, int sig)
425 return sys_kill(pid, sig);
428 long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
429 __u32 len_low, __u32 len_high, int advice)
431 return sys_fadvise64_64(fd,
432 (((u64)offset_high)<<32) | offset_low,
433 (((u64)len_high)<<32) | len_low,
437 long sys32_vm86_warning(void)
439 struct task_struct *me = current;
440 static char lastcomm[sizeof(me->comm)];
442 if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
443 compat_printk(KERN_INFO
444 "%s: vm86 mode not supported on 64 bit kernel\n",
446 strncpy(lastcomm, me->comm, sizeof(lastcomm));
451 long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
452 char __user *buf, size_t len)
454 return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
457 asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
460 return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
463 asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
464 unsigned n_low, unsigned n_hi, int flags)
466 return sys_sync_file_range(fd,
467 ((u64)off_hi << 32) | off_low,
468 ((u64)n_hi << 32) | n_low, flags);
471 asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi,
472 size_t len, int advice)
474 return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
478 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
479 unsigned offset_hi, unsigned len_lo,
482 return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
483 ((u64)len_hi << 32) | len_lo);
486 asmlinkage long sys32_fanotify_mark(int fanotify_fd, unsigned int flags,
487 u32 mask_lo, u32 mask_hi,
488 int fd, const char __user *pathname)
490 return sys_fanotify_mark(fanotify_fd, flags,
491 ((u64)mask_hi << 32) | mask_lo,