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 * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@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/module.h>
31 #include <linux/binfmts.h>
32 #include <linux/security.h>
33 #include <linux/compat.h>
34 #include <linux/vfs.h>
35 #include <linux/ipc.h>
36 #include <linux/slab.h>
37
38 #include <net/sock.h>
39 #include <net/scm.h>
40
41 #include <asm/compat-signal.h>
42 #include <asm/sim.h>
43 #include <asm/uaccess.h>
44 #include <asm/mmu_context.h>
45 #include <asm/mman.h>
46
47 /* Use this to get at 32-bit user passed pointers. */
48 /* A() macro should be used for places where you e.g.
49 have some internal variable u32 and just want to get
50 rid of a compiler warning. AA() has to be used in
51 places where you want to convert a function argument
52 to 32bit pointer or when you e.g. access pt_regs
53 structure and want to consider 32bit registers only.
54 */
55 #define A(__x) ((unsigned long)(__x))
56 #define AA(__x) ((unsigned long)((int)__x))
57
58 #ifdef __MIPSEB__
59 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
60 #endif
61 #ifdef __MIPSEL__
62 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
63 #endif
64
65 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
66 unsigned long, prot, unsigned long, flags, unsigned long, fd,
67 unsigned long, pgoff)
68 {
69 unsigned long error;
70
71 error = -EINVAL;
72 if (pgoff & (~PAGE_MASK >> 12))
73 goto out;
74 error = sys_mmap_pgoff(addr, len, prot, flags, fd,
75 pgoff >> (PAGE_SHIFT-12));
76 out:
77 return error;
78 }
79
80 /*
81 * sys_execve() executes a new program.
82 */
sys32_execve(nabi_no_regargs struct pt_regs regs)83 asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
84 {
85 int error;
86 char * filename;
87
88 filename = getname(compat_ptr(regs.regs[4]));
89 error = PTR_ERR(filename);
90 if (IS_ERR(filename))
91 goto out;
92 error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
93 compat_ptr(regs.regs[6]), ®s);
94 putname(filename);
95
96 out:
97 return error;
98 }
99
100 #define RLIM_INFINITY32 0x7fffffff
101 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
102
103 struct rlimit32 {
104 int rlim_cur;
105 int rlim_max;
106 };
107
108 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
109 unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
110 {
111 return sys_truncate(path, merge_64(a2, a3));
112 }
113
114 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
115 unsigned long, a2, unsigned long, a3)
116 {
117 return sys_ftruncate(fd, merge_64(a2, a3));
118 }
119
120 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
121 unsigned int, offset_low, loff_t __user *, result,
122 unsigned int, origin)
123 {
124 return sys_llseek(fd, offset_high, offset_low, result, origin);
125 }
126
127 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
128 lseek back to original location. They fail just like lseek does on
129 non-seekable files. */
130
131 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
132 unsigned long, unused, unsigned long, a4, unsigned long, a5)
133 {
134 return sys_pread64(fd, buf, count, merge_64(a4, a5));
135 }
136
137 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
138 size_t, count, u32, unused, u64, a4, u64, a5)
139 {
140 return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
141 }
142
143 SYSCALL_DEFINE2(32_sched_rr_get_interval, compat_pid_t, pid,
144 struct compat_timespec __user *, interval)
145 {
146 struct timespec t;
147 int ret;
148 mm_segment_t old_fs = get_fs();
149
150 set_fs(KERNEL_DS);
151 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
152 set_fs(old_fs);
153 if (put_user (t.tv_sec, &interval->tv_sec) ||
154 __put_user(t.tv_nsec, &interval->tv_nsec))
155 return -EFAULT;
156 return ret;
157 }
158
159 #ifdef CONFIG_SYSVIPC
160
161 SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
162 unsigned long, ptr, unsigned long, fifth)
163 {
164 int version, err;
165
166 version = call >> 16; /* hack for backward compatibility */
167 call &= 0xffff;
168
169 switch (call) {
170 case SEMOP:
171 /* struct sembuf is the same on 32 and 64bit :)) */
172 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
173 break;
174 case SEMTIMEDOP:
175 err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
176 compat_ptr(fifth));
177 break;
178 case SEMGET:
179 err = sys_semget(first, second, third);
180 break;
181 case SEMCTL:
182 err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
183 break;
184 case MSGSND:
185 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
186 break;
187 case MSGRCV:
188 err = compat_sys_msgrcv(first, second, fifth, third,
189 version, compat_ptr(ptr));
190 break;
191 case MSGGET:
192 err = sys_msgget((key_t) first, second);
193 break;
194 case MSGCTL:
195 err = compat_sys_msgctl(first, second, compat_ptr(ptr));
196 break;
197 case SHMAT:
198 err = compat_sys_shmat(first, second, third, version,
199 compat_ptr(ptr));
200 break;
201 case SHMDT:
202 err = sys_shmdt(compat_ptr(ptr));
203 break;
204 case SHMGET:
205 err = sys_shmget(first, (unsigned)second, third);
206 break;
207 case SHMCTL:
208 err = compat_sys_shmctl(first, second, compat_ptr(ptr));
209 break;
210 default:
211 err = -EINVAL;
212 break;
213 }
214
215 return err;
216 }
217
218 #else
219
220 SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
221 u32, ptr, u32, fifth)
222 {
223 return -ENOSYS;
224 }
225
226 #endif /* CONFIG_SYSVIPC */
227
228 #ifdef CONFIG_MIPS32_N32
SYSCALL_DEFINE4(n32_semctl,int,semid,int,semnum,int,cmd,u32,arg)229 SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg)
230 {
231 /* compat_sys_semctl expects a pointer to union semun */
232 u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
233 if (put_user(arg, uptr))
234 return -EFAULT;
235 return compat_sys_semctl(semid, semnum, cmd, uptr);
236 }
237
SYSCALL_DEFINE4(n32_msgsnd,int,msqid,u32,msgp,unsigned int,msgsz,int,msgflg)238 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
239 int, msgflg)
240 {
241 return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
242 }
243
SYSCALL_DEFINE5(n32_msgrcv,int,msqid,u32,msgp,size_t,msgsz,int,msgtyp,int,msgflg)244 SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
245 int, msgtyp, int, msgflg)
246 {
247 return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
248 compat_ptr(msgp));
249 }
250 #endif
251
252 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
253 {
254 unsigned int p = personality & 0xffffffff;
255 int ret;
256
257 if (personality(current->personality) == PER_LINUX32 &&
258 personality(p) == PER_LINUX)
259 p = (p & ~PER_MASK) | PER_LINUX32;
260 ret = sys_personality(p);
261 if (ret != -1 && personality(ret) == PER_LINUX32)
262 ret = (ret & ~PER_MASK) | PER_LINUX;
263 return ret;
264 }
265
266 SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, in_fd,
267 compat_off_t __user *, offset, s32, count)
268 {
269 mm_segment_t old_fs = get_fs();
270 int ret;
271 off_t of;
272
273 if (offset && get_user(of, offset))
274 return -EFAULT;
275
276 set_fs(KERNEL_DS);
277 ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
278 set_fs(old_fs);
279
280 if (offset && put_user(of, offset))
281 return -EFAULT;
282
283 return ret;
284 }
285
sys32_readahead(int fd,u32 pad0,u64 a2,u64 a3,size_t count)286 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
287 size_t count)
288 {
289 return sys_readahead(fd, merge_64(a2, a3), count);
290 }
291
sys32_sync_file_range(int fd,int __pad,unsigned long a2,unsigned long a3,unsigned long a4,unsigned long a5,int flags)292 asmlinkage long sys32_sync_file_range(int fd, int __pad,
293 unsigned long a2, unsigned long a3,
294 unsigned long a4, unsigned long a5,
295 int flags)
296 {
297 return sys_sync_file_range(fd,
298 merge_64(a2, a3), merge_64(a4, a5),
299 flags);
300 }
301
sys32_fadvise64_64(int fd,int __pad,unsigned long a2,unsigned long a3,unsigned long a4,unsigned long a5,int flags)302 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
303 unsigned long a2, unsigned long a3,
304 unsigned long a4, unsigned long a5,
305 int flags)
306 {
307 return sys_fadvise64_64(fd,
308 merge_64(a2, a3), merge_64(a4, a5),
309 flags);
310 }
311
sys32_fallocate(int fd,int mode,unsigned offset_a2,unsigned offset_a3,unsigned len_a4,unsigned len_a5)312 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
313 unsigned offset_a3, unsigned len_a4, unsigned len_a5)
314 {
315 return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
316 merge_64(len_a4, len_a5));
317 }
318
319 save_static_function(sys32_clone);
320 static int noinline __used
_sys32_clone(nabi_no_regargs struct pt_regs regs)321 _sys32_clone(nabi_no_regargs struct pt_regs regs)
322 {
323 unsigned long clone_flags;
324 unsigned long newsp;
325 int __user *parent_tidptr, *child_tidptr;
326
327 clone_flags = regs.regs[4];
328 newsp = regs.regs[5];
329 if (!newsp)
330 newsp = regs.regs[29];
331 parent_tidptr = (int __user *) regs.regs[6];
332
333 /* Use __dummy4 instead of getting it off the stack, so that
334 syscall() works. */
335 child_tidptr = (int __user *) __dummy4;
336 return do_fork(clone_flags, newsp, ®s, 0,
337 parent_tidptr, child_tidptr);
338 }
339
sys32_lookup_dcookie(u32 a0,u32 a1,char __user * buf,size_t len)340 asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
341 size_t len)
342 {
343 return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
344 }
345
346 SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags,
347 u64, a3, u64, a4, int, dfd, const char __user *, pathname)
348 {
349 return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4),
350 dfd, pathname);
351 }
352
353 SYSCALL_DEFINE6(32_futex, u32 __user *, uaddr, int, op, u32, val,
354 struct compat_timespec __user *, utime, u32 __user *, uaddr2,
355 u32, val3)
356 {
357 return compat_sys_futex(uaddr, op, val, utime, uaddr2, val3);
358 }
359