Linux kernel mirror (for testing)
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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/* Use this to get at 32-bit user passed pointers. */
47/* A() macro should be used for places where you e.g.
48 have some internal variable u32 and just want to get
49 rid of a compiler warning. AA() has to be used in
50 places where you want to convert a function argument
51 to 32bit pointer or when you e.g. access pt_regs
52 structure and want to consider 32bit registers only.
53 */
54#define A(__x) ((unsigned long)(__x))
55#define AA(__x) ((unsigned long)((int)__x))
56
57#ifdef __MIPSEB__
58#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
59#endif
60#ifdef __MIPSEL__
61#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
62#endif
63
64SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
65 unsigned long, prot, unsigned long, flags, unsigned long, fd,
66 unsigned long, pgoff)
67{
68 if (pgoff & (~PAGE_MASK >> 12))
69 return -EINVAL;
70 return sys_mmap_pgoff(addr, len, prot, flags, fd,
71 pgoff >> (PAGE_SHIFT-12));
72}
73
74#define RLIM_INFINITY32 0x7fffffff
75#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
76
77struct rlimit32 {
78 int rlim_cur;
79 int rlim_max;
80};
81
82SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
83 unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
84{
85 return sys_truncate(path, merge_64(a2, a3));
86}
87
88SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
89 unsigned long, a2, unsigned long, a3)
90{
91 return sys_ftruncate(fd, merge_64(a2, a3));
92}
93
94SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
95 unsigned int, offset_low, loff_t __user *, result,
96 unsigned int, origin)
97{
98 return sys_llseek(fd, offset_high, offset_low, result, origin);
99}
100
101/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
102 lseek back to original location. They fail just like lseek does on
103 non-seekable files. */
104
105SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
106 unsigned long, unused, unsigned long, a4, unsigned long, a5)
107{
108 return sys_pread64(fd, buf, count, merge_64(a4, a5));
109}
110
111SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
112 size_t, count, u32, unused, u64, a4, u64, a5)
113{
114 return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
115}
116
117SYSCALL_DEFINE1(32_personality, unsigned long, personality)
118{
119 unsigned int p = personality & 0xffffffff;
120 int ret;
121
122 if (personality(current->personality) == PER_LINUX32 &&
123 personality(p) == PER_LINUX)
124 p = (p & ~PER_MASK) | PER_LINUX32;
125 ret = sys_personality(p);
126 if (ret != -1 && personality(ret) == PER_LINUX32)
127 ret = (ret & ~PER_MASK) | PER_LINUX;
128 return ret;
129}
130
131asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
132 size_t count)
133{
134 return sys_readahead(fd, merge_64(a2, a3), count);
135}
136
137asmlinkage long sys32_sync_file_range(int fd, int __pad,
138 unsigned long a2, unsigned long a3,
139 unsigned long a4, unsigned long a5,
140 int flags)
141{
142 return sys_sync_file_range(fd,
143 merge_64(a2, a3), merge_64(a4, a5),
144 flags);
145}
146
147asmlinkage long sys32_fadvise64_64(int fd, int __pad,
148 unsigned long a2, unsigned long a3,
149 unsigned long a4, unsigned long a5,
150 int flags)
151{
152 return sys_fadvise64_64(fd,
153 merge_64(a2, a3), merge_64(a4, a5),
154 flags);
155}
156
157asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
158 unsigned offset_a3, unsigned len_a4, unsigned len_a5)
159{
160 return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
161 merge_64(len_a4, len_a5));
162}