1 // SPDX-License-Identifier: GPL-2.0
3 * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
6 * Copyright (C) 2000 VA Linux Co
7 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
8 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
9 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
10 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
11 * Copyright (C) 2000 Hewlett-Packard Co.
12 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
13 * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
15 * These routines maintain argument size conversion between 32bit and 64bit
16 * environment. In 2.5 most of this should be moved to a generic directory.
18 * This file assumes that there is a hole at the end of user address space.
20 * Some of the functions are LE specific currently. These are
21 * hopefully all marked. This should be fixed.
24 #include <linux/kernel.h>
25 #include <linux/sched.h>
27 #include <linux/file.h>
28 #include <linux/signal.h>
29 #include <linux/syscalls.h>
30 #include <linux/times.h>
31 #include <linux/utsname.h>
33 #include <linux/uio.h>
34 #include <linux/poll.h>
35 #include <linux/personality.h>
36 #include <linux/stat.h>
37 #include <linux/rwsem.h>
38 #include <linux/compat.h>
39 #include <linux/vfs.h>
40 #include <linux/ptrace.h>
41 #include <linux/highuid.h>
42 #include <linux/sysctl.h>
43 #include <linux/slab.h>
45 #include <asm/types.h>
46 #include <linux/uaccess.h>
47 #include <linux/atomic.h>
48 #include <asm/vgtod.h>
49 #include <asm/sys_ia32.h>
51 #define AA(__x) ((unsigned long)(__x))
54 COMPAT_SYSCALL_DEFINE3(x86_truncate64, const char __user *, filename,
55 unsigned long, offset_low, unsigned long, offset_high)
57 return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
60 COMPAT_SYSCALL_DEFINE3(x86_ftruncate64, unsigned int, fd,
61 unsigned long, offset_low, 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 COMPAT_SYSCALL_DEFINE2(x86_stat64, const char __user *, filename,
99 struct stat64 __user *, statbuf)
102 int ret = vfs_stat(filename, &stat);
105 ret = cp_stat64(statbuf, &stat);
109 COMPAT_SYSCALL_DEFINE2(x86_lstat64, const char __user *, filename,
110 struct stat64 __user *, statbuf)
113 int ret = vfs_lstat(filename, &stat);
115 ret = cp_stat64(statbuf, &stat);
119 COMPAT_SYSCALL_DEFINE2(x86_fstat64, unsigned int, fd,
120 struct stat64 __user *, statbuf)
123 int ret = vfs_fstat(fd, &stat);
125 ret = cp_stat64(statbuf, &stat);
129 COMPAT_SYSCALL_DEFINE4(x86_fstatat, unsigned int, dfd,
130 const char __user *, filename,
131 struct stat64 __user *, statbuf, int, flag)
136 error = vfs_fstatat(dfd, filename, &stat, flag);
139 return cp_stat64(statbuf, &stat);
143 * Linux/i386 didn't use to be able to handle more than
144 * 4 system call parameters, so these system calls used a memory
145 * block for parameter passing..
148 struct mmap_arg_struct32 {
157 COMPAT_SYSCALL_DEFINE1(x86_mmap, struct mmap_arg_struct32 __user *, arg)
159 struct mmap_arg_struct32 a;
161 if (copy_from_user(&a, arg, sizeof(a)))
164 if (a.offset & ~PAGE_MASK)
167 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
168 a.offset>>PAGE_SHIFT);
171 COMPAT_SYSCALL_DEFINE3(x86_waitpid, compat_pid_t, pid, unsigned int __user *,
172 stat_addr, int, options)
174 return compat_sys_wait4(pid, stat_addr, options, NULL);
177 /* warning: next two assume little endian */
178 COMPAT_SYSCALL_DEFINE5(x86_pread, unsigned int, fd, char __user *, ubuf,
179 u32, count, u32, poslo, u32, poshi)
181 return sys_pread64(fd, ubuf, count,
182 ((loff_t)AA(poshi) << 32) | AA(poslo));
185 COMPAT_SYSCALL_DEFINE5(x86_pwrite, unsigned int, fd, const char __user *, ubuf,
186 u32, count, u32, poslo, u32, poshi)
188 return sys_pwrite64(fd, ubuf, count,
189 ((loff_t)AA(poshi) << 32) | AA(poslo));
194 * Some system calls that need sign extended arguments. This could be
195 * done by a generic wrapper.
197 COMPAT_SYSCALL_DEFINE6(x86_fadvise64_64, int, fd, __u32, offset_low,
198 __u32, offset_high, __u32, len_low, __u32, len_high,
201 return sys_fadvise64_64(fd,
202 (((u64)offset_high)<<32) | offset_low,
203 (((u64)len_high)<<32) | len_low,
207 COMPAT_SYSCALL_DEFINE4(x86_readahead, int, fd, unsigned int, off_lo,
208 unsigned int, off_hi, size_t, count)
210 return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
213 COMPAT_SYSCALL_DEFINE6(x86_sync_file_range, int, fd, unsigned int, off_low,
214 unsigned int, off_hi, unsigned int, n_low,
215 unsigned int, n_hi, int, flags)
217 return sys_sync_file_range(fd,
218 ((u64)off_hi << 32) | off_low,
219 ((u64)n_hi << 32) | n_low, flags);
222 COMPAT_SYSCALL_DEFINE5(x86_fadvise64, int, fd, unsigned int, offset_lo,
223 unsigned int, offset_hi, size_t, len, int, advice)
225 return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
229 COMPAT_SYSCALL_DEFINE6(x86_fallocate, int, fd, int, mode,
230 unsigned int, offset_lo, unsigned int, offset_hi,
231 unsigned int, len_lo, unsigned int, len_hi)
233 return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
234 ((u64)len_hi << 32) | len_lo);
238 * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
240 COMPAT_SYSCALL_DEFINE5(x86_clone, unsigned long, clone_flags,
241 unsigned long, newsp, int __user *, parent_tidptr,
242 unsigned long, tls_val, int __user *, child_tidptr)
244 return sys_clone(clone_flags, newsp, parent_tidptr, child_tidptr,