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linux32.c
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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 ([email protected])
6  * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar ([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/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  */
83 asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
84 {
85  int error;
86  struct filename *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->name, compat_ptr(regs.regs[5]),
93  compat_ptr(regs.regs[6]), &regs);
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 {
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
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 
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 
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 
287  size_t count)
288 {
289  return sys_readahead(fd, merge_64(a2, a3), count);
290 }
291 
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 
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 
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 
320 static int noinline __used
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, &regs, 0,
337  parent_tidptr, child_tidptr);
338 }
339 
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 }