xref: /openbmc/linux/arch/mips/kernel/linux32.c (revision 82003e04)
1 /*
2  * Conversion between 32-bit and 64-bit native system calls.
3  *
4  * Copyright (C) 2000 Silicon Graphics, Inc.
5  * Written by Ulf Carlsson (ulfc@engr.sgi.com)
6  */
7 #include <linux/compiler.h>
8 #include <linux/mm.h>
9 #include <linux/errno.h>
10 #include <linux/file.h>
11 #include <linux/highuid.h>
12 #include <linux/resource.h>
13 #include <linux/highmem.h>
14 #include <linux/time.h>
15 #include <linux/times.h>
16 #include <linux/poll.h>
17 #include <linux/skbuff.h>
18 #include <linux/filter.h>
19 #include <linux/shm.h>
20 #include <linux/sem.h>
21 #include <linux/msg.h>
22 #include <linux/icmpv6.h>
23 #include <linux/syscalls.h>
24 #include <linux/sysctl.h>
25 #include <linux/utime.h>
26 #include <linux/utsname.h>
27 #include <linux/personality.h>
28 #include <linux/dnotify.h>
29 #include <linux/binfmts.h>
30 #include <linux/security.h>
31 #include <linux/compat.h>
32 #include <linux/vfs.h>
33 #include <linux/ipc.h>
34 #include <linux/slab.h>
35 
36 #include <net/sock.h>
37 #include <net/scm.h>
38 
39 #include <asm/compat-signal.h>
40 #include <asm/sim.h>
41 #include <asm/uaccess.h>
42 #include <asm/mmu_context.h>
43 #include <asm/mman.h>
44 
45 /* Use this to get at 32-bit user passed pointers. */
46 /* A() macro should be used for places where you e.g.
47    have some internal variable u32 and just want to get
48    rid of a compiler warning. AA() has to be used in
49    places where you want to convert a function argument
50    to 32bit pointer or when you e.g. access pt_regs
51    structure and want to consider 32bit registers only.
52  */
53 #define A(__x) ((unsigned long)(__x))
54 #define AA(__x) ((unsigned long)((int)__x))
55 
56 #ifdef __MIPSEB__
57 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
58 #endif
59 #ifdef __MIPSEL__
60 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
61 #endif
62 
63 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
64 	unsigned long, prot, unsigned long, flags, unsigned long, fd,
65 	unsigned long, pgoff)
66 {
67 	unsigned long error;
68 
69 	error = -EINVAL;
70 	if (pgoff & (~PAGE_MASK >> 12))
71 		goto out;
72 	error = sys_mmap_pgoff(addr, len, prot, flags, fd,
73 			       pgoff >> (PAGE_SHIFT-12));
74 out:
75 	return error;
76 }
77 
78 #define RLIM_INFINITY32 0x7fffffff
79 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
80 
81 struct rlimit32 {
82 	int	rlim_cur;
83 	int	rlim_max;
84 };
85 
86 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
87 	unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
88 {
89 	return sys_truncate(path, merge_64(a2, a3));
90 }
91 
92 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
93 	unsigned long, a2, unsigned long, a3)
94 {
95 	return sys_ftruncate(fd, merge_64(a2, a3));
96 }
97 
98 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
99 		unsigned int, offset_low, loff_t __user *, result,
100 		unsigned int, origin)
101 {
102 	return sys_llseek(fd, offset_high, offset_low, result, origin);
103 }
104 
105 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
106    lseek back to original location.  They fail just like lseek does on
107    non-seekable files.	*/
108 
109 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
110 	unsigned long, unused, unsigned long, a4, unsigned long, a5)
111 {
112 	return sys_pread64(fd, buf, count, merge_64(a4, a5));
113 }
114 
115 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
116 	size_t, count, u32, unused, u64, a4, u64, a5)
117 {
118 	return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
119 }
120 
121 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
122 {
123 	unsigned int p = personality & 0xffffffff;
124 	int ret;
125 
126 	if (personality(current->personality) == PER_LINUX32 &&
127 	    personality(p) == PER_LINUX)
128 		p = (p & ~PER_MASK) | PER_LINUX32;
129 	ret = sys_personality(p);
130 	if (ret != -1 && personality(ret) == PER_LINUX32)
131 		ret = (ret & ~PER_MASK) | PER_LINUX;
132 	return ret;
133 }
134 
135 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
136 				   size_t count)
137 {
138 	return sys_readahead(fd, merge_64(a2, a3), count);
139 }
140 
141 asmlinkage long sys32_sync_file_range(int fd, int __pad,
142 	unsigned long a2, unsigned long a3,
143 	unsigned long a4, unsigned long a5,
144 	int flags)
145 {
146 	return sys_sync_file_range(fd,
147 			merge_64(a2, a3), merge_64(a4, a5),
148 			flags);
149 }
150 
151 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
152 	unsigned long a2, unsigned long a3,
153 	unsigned long a4, unsigned long a5,
154 	int flags)
155 {
156 	return sys_fadvise64_64(fd,
157 			merge_64(a2, a3), merge_64(a4, a5),
158 			flags);
159 }
160 
161 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
162 	unsigned offset_a3, unsigned len_a4, unsigned len_a5)
163 {
164 	return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
165 			     merge_64(len_a4, len_a5));
166 }
167