projects/linux·blob uaccess-cleanups · refs

134 lines · 3.6 KiB

1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Conversion between 32-bit and 64-bit native system calls.
4 *
5 * Copyright (C) 2000 Silicon Graphics, Inc.
6 * Written by Ulf Carlsson ([email protected])
7 */
8#include <linux/compiler.h>
9#include <linux/mm.h>
10#include <linux/errno.h>
11#include <linux/file.h>
12#include <linux/highuid.h>
13#include <linux/resource.h>
14#include <linux/highmem.h>
15#include <linux/time.h>
16#include <linux/times.h>
17#include <linux/poll.h>
18#include <linux/skbuff.h>
19#include <linux/filter.h>
20#include <linux/shm.h>
21#include <linux/sem.h>
22#include <linux/msg.h>
23#include <linux/icmpv6.h>
24#include <linux/syscalls.h>
25#include <linux/sysctl.h>
26#include <linux/utime.h>
27#include <linux/utsname.h>
28#include <linux/personality.h>
29#include <linux/dnotify.h>
30#include <linux/binfmts.h>
31#include <linux/security.h>
32#include <linux/compat.h>
33#include <linux/vfs.h>
34#include <linux/ipc.h>
35#include <linux/slab.h>
36
37#include <net/sock.h>
38#include <net/scm.h>
39
40#include <asm/compat-signal.h>
41#include <asm/sim.h>
42#include <linux/uaccess.h>
43#include <asm/mmu_context.h>
44#include <asm/mman.h>
45#include <asm/syscalls.h>
46
47#ifdef __MIPSEB__
48#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
49#endif
50#ifdef __MIPSEL__
51#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
52#endif
53
54SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
55 unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
56{
57 return ksys_truncate(path, merge_64(a2, a3));
58}
59
60SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
61 unsigned long, a2, unsigned long, a3)
62{
63 return ksys_ftruncate(fd, merge_64(a2, a3), FTRUNCATE_LFS);
64}
65
66SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
67 unsigned int, offset_low, loff_t __user *, result,
68 unsigned int, origin)
69{
70 return sys_llseek(fd, offset_high, offset_low, result, origin);
71}
72
73/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
74 lseek back to original location. They fail just like lseek does on
75 non-seekable files. */
76
77SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
78 unsigned long, unused, unsigned long, a4, unsigned long, a5)
79{
80 return ksys_pread64(fd, buf, count, merge_64(a4, a5));
81}
82
83SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
84 size_t, count, u32, unused, u64, a4, u64, a5)
85{
86 return ksys_pwrite64(fd, buf, count, merge_64(a4, a5));
87}
88
89SYSCALL_DEFINE1(32_personality, unsigned long, personality)
90{
91 unsigned int p = personality & 0xffffffff;
92 int ret;
93
94 if (personality(current->personality) == PER_LINUX32 &&
95 personality(p) == PER_LINUX)
96 p = (p & ~PER_MASK) | PER_LINUX32;
97 ret = sys_personality(p);
98 if (ret != -1 && personality(ret) == PER_LINUX32)
99 ret = (ret & ~PER_MASK) | PER_LINUX;
100 return ret;
101}
102
103asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
104 size_t count)
105{
106 return ksys_readahead(fd, merge_64(a2, a3), count);
107}
108
109asmlinkage long sys32_sync_file_range(int fd, int __pad,
110 unsigned long a2, unsigned long a3,
111 unsigned long a4, unsigned long a5,
112 int flags)
113{
114 return ksys_sync_file_range(fd,
115 merge_64(a2, a3), merge_64(a4, a5),
116 flags);
117}
118
119asmlinkage long sys32_fadvise64_64(int fd, int __pad,
120 unsigned long a2, unsigned long a3,
121 unsigned long a4, unsigned long a5,
122 int flags)
123{
124 return ksys_fadvise64_64(fd,
125 merge_64(a2, a3), merge_64(a4, a5),
126 flags);
127}
128
129asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
130 unsigned offset_a3, unsigned len_a4, unsigned len_a5)
131{
132 return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
133 merge_64(len_a4, len_a5));
134}