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 (ulfc@engr.sgi.com)
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
46#ifdef __MIPSEB__
47#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
48#endif
49#ifdef __MIPSEL__
50#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
51#endif
52
53SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
54 unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
55{
56 return ksys_truncate(path, merge_64(a2, a3));
57}
58
59SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
60 unsigned long, a2, unsigned long, a3)
61{
62 return ksys_ftruncate(fd, merge_64(a2, a3));
63}
64
65SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
66 unsigned int, offset_low, loff_t __user *, result,
67 unsigned int, origin)
68{
69 return sys_llseek(fd, offset_high, offset_low, result, origin);
70}
71
72/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
73 lseek back to original location. They fail just like lseek does on
74 non-seekable files. */
75
76SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
77 unsigned long, unused, unsigned long, a4, unsigned long, a5)
78{
79 return ksys_pread64(fd, buf, count, merge_64(a4, a5));
80}
81
82SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
83 size_t, count, u32, unused, u64, a4, u64, a5)
84{
85 return ksys_pwrite64(fd, buf, count, merge_64(a4, a5));
86}
87
88SYSCALL_DEFINE1(32_personality, unsigned long, personality)
89{
90 unsigned int p = personality & 0xffffffff;
91 int ret;
92
93 if (personality(current->personality) == PER_LINUX32 &&
94 personality(p) == PER_LINUX)
95 p = (p & ~PER_MASK) | PER_LINUX32;
96 ret = sys_personality(p);
97 if (ret != -1 && personality(ret) == PER_LINUX32)
98 ret = (ret & ~PER_MASK) | PER_LINUX;
99 return ret;
100}
101
102asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
103 size_t count)
104{
105 return ksys_readahead(fd, merge_64(a2, a3), count);
106}
107
108asmlinkage long sys32_sync_file_range(int fd, int __pad,
109 unsigned long a2, unsigned long a3,
110 unsigned long a4, unsigned long a5,
111 int flags)
112{
113 return ksys_sync_file_range(fd,
114 merge_64(a2, a3), merge_64(a4, a5),
115 flags);
116}
117
118asmlinkage long sys32_fadvise64_64(int fd, int __pad,
119 unsigned long a2, unsigned long a3,
120 unsigned long a4, unsigned long a5,
121 int flags)
122{
123 return ksys_fadvise64_64(fd,
124 merge_64(a2, a3), merge_64(a4, a5),
125 flags);
126}
127
128asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
129 unsigned offset_a3, unsigned len_a4, unsigned len_a5)
130{
131 return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
132 merge_64(len_a4, len_a5));
133}
134

source code of linux/arch/mips/kernel/linux32.c