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/module.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 <asm/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 64 SYSCALL_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 unsigned long error; 69 70 error = -EINVAL; 71 if (pgoff & (~PAGE_MASK >> 12)) 72 goto out; 73 error = sys_mmap_pgoff(addr, len, prot, flags, fd, 74 pgoff >> (PAGE_SHIFT-12)); 75 out: 76 return error; 77 } 78 79 #define RLIM_INFINITY32 0x7fffffff 80 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x) 81 82 struct rlimit32 { 83 int rlim_cur; 84 int rlim_max; 85 }; 86 87 SYSCALL_DEFINE4(32_truncate64, const char __user *, path, 88 unsigned long, __dummy, unsigned long, a2, unsigned long, a3) 89 { 90 return sys_truncate(path, merge_64(a2, a3)); 91 } 92 93 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy, 94 unsigned long, a2, unsigned long, a3) 95 { 96 return sys_ftruncate(fd, merge_64(a2, a3)); 97 } 98 99 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high, 100 unsigned int, offset_low, loff_t __user *, result, 101 unsigned int, origin) 102 { 103 return sys_llseek(fd, offset_high, offset_low, result, origin); 104 } 105 106 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op + 107 lseek back to original location. They fail just like lseek does on 108 non-seekable files. */ 109 110 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count, 111 unsigned long, unused, unsigned long, a4, unsigned long, a5) 112 { 113 return sys_pread64(fd, buf, count, merge_64(a4, a5)); 114 } 115 116 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf, 117 size_t, count, u32, unused, u64, a4, u64, a5) 118 { 119 return sys_pwrite64(fd, buf, count, merge_64(a4, a5)); 120 } 121 122 SYSCALL_DEFINE2(32_sched_rr_get_interval, compat_pid_t, pid, 123 struct compat_timespec __user *, interval) 124 { 125 struct timespec t; 126 int ret; 127 mm_segment_t old_fs = get_fs(); 128 129 set_fs(KERNEL_DS); 130 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 131 set_fs(old_fs); 132 if (put_user (t.tv_sec, &interval->tv_sec) || 133 __put_user(t.tv_nsec, &interval->tv_nsec)) 134 return -EFAULT; 135 return ret; 136 } 137 138 #ifdef CONFIG_SYSVIPC 139 140 SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third, 141 unsigned long, ptr, unsigned long, fifth) 142 { 143 int version, err; 144 145 version = call >> 16; /* hack for backward compatibility */ 146 call &= 0xffff; 147 148 switch (call) { 149 case SEMOP: 150 /* struct sembuf is the same on 32 and 64bit :)) */ 151 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL); 152 break; 153 case SEMTIMEDOP: 154 err = compat_sys_semtimedop(first, compat_ptr(ptr), second, 155 compat_ptr(fifth)); 156 break; 157 case SEMGET: 158 err = sys_semget(first, second, third); 159 break; 160 case SEMCTL: 161 err = compat_sys_semctl(first, second, third, compat_ptr(ptr)); 162 break; 163 case MSGSND: 164 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr)); 165 break; 166 case MSGRCV: 167 err = compat_sys_msgrcv(first, second, fifth, third, 168 version, compat_ptr(ptr)); 169 break; 170 case MSGGET: 171 err = sys_msgget((key_t) first, second); 172 break; 173 case MSGCTL: 174 err = compat_sys_msgctl(first, second, compat_ptr(ptr)); 175 break; 176 case SHMAT: 177 err = compat_sys_shmat(first, second, third, version, 178 compat_ptr(ptr)); 179 break; 180 case SHMDT: 181 err = sys_shmdt(compat_ptr(ptr)); 182 break; 183 case SHMGET: 184 err = sys_shmget(first, (unsigned)second, third); 185 break; 186 case SHMCTL: 187 err = compat_sys_shmctl(first, second, compat_ptr(ptr)); 188 break; 189 default: 190 err = -EINVAL; 191 break; 192 } 193 194 return err; 195 } 196 197 #else 198 199 SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third, 200 u32, ptr, u32, fifth) 201 { 202 return -ENOSYS; 203 } 204 205 #endif /* CONFIG_SYSVIPC */ 206 207 #ifdef CONFIG_MIPS32_N32 208 SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg) 209 { 210 /* compat_sys_semctl expects a pointer to union semun */ 211 u32 __user *uptr = compat_alloc_user_space(sizeof(u32)); 212 if (put_user(arg, uptr)) 213 return -EFAULT; 214 return compat_sys_semctl(semid, semnum, cmd, uptr); 215 } 216 217 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz, 218 int, msgflg) 219 { 220 return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp)); 221 } 222 223 SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz, 224 int, msgtyp, int, msgflg) 225 { 226 return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64, 227 compat_ptr(msgp)); 228 } 229 #endif 230 231 SYSCALL_DEFINE1(32_personality, unsigned long, personality) 232 { 233 unsigned int p = personality & 0xffffffff; 234 int ret; 235 236 if (personality(current->personality) == PER_LINUX32 && 237 personality(p) == PER_LINUX) 238 p = (p & ~PER_MASK) | PER_LINUX32; 239 ret = sys_personality(p); 240 if (ret != -1 && personality(ret) == PER_LINUX32) 241 ret = (ret & ~PER_MASK) | PER_LINUX; 242 return ret; 243 } 244 245 SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, in_fd, 246 compat_off_t __user *, offset, s32, count) 247 { 248 mm_segment_t old_fs = get_fs(); 249 int ret; 250 off_t of; 251 252 if (offset && get_user(of, offset)) 253 return -EFAULT; 254 255 set_fs(KERNEL_DS); 256 ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count); 257 set_fs(old_fs); 258 259 if (offset && put_user(of, offset)) 260 return -EFAULT; 261 262 return ret; 263 } 264 265 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3, 266 size_t count) 267 { 268 return sys_readahead(fd, merge_64(a2, a3), count); 269 } 270 271 asmlinkage long sys32_sync_file_range(int fd, int __pad, 272 unsigned long a2, unsigned long a3, 273 unsigned long a4, unsigned long a5, 274 int flags) 275 { 276 return sys_sync_file_range(fd, 277 merge_64(a2, a3), merge_64(a4, a5), 278 flags); 279 } 280 281 asmlinkage long sys32_fadvise64_64(int fd, int __pad, 282 unsigned long a2, unsigned long a3, 283 unsigned long a4, unsigned long a5, 284 int flags) 285 { 286 return sys_fadvise64_64(fd, 287 merge_64(a2, a3), merge_64(a4, a5), 288 flags); 289 } 290 291 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2, 292 unsigned offset_a3, unsigned len_a4, unsigned len_a5) 293 { 294 return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3), 295 merge_64(len_a4, len_a5)); 296 } 297 298 save_static_function(sys32_clone); 299 static int noinline __used 300 _sys32_clone(nabi_no_regargs struct pt_regs regs) 301 { 302 unsigned long clone_flags; 303 unsigned long newsp; 304 int __user *parent_tidptr, *child_tidptr; 305 306 clone_flags = regs.regs[4]; 307 newsp = regs.regs[5]; 308 if (!newsp) 309 newsp = regs.regs[29]; 310 parent_tidptr = (int __user *) regs.regs[6]; 311 312 /* Use __dummy4 instead of getting it off the stack, so that 313 syscall() works. */ 314 child_tidptr = (int __user *) __dummy4; 315 return do_fork(clone_flags, newsp, 0, 316 parent_tidptr, child_tidptr); 317 } 318 319 asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf, 320 size_t len) 321 { 322 return sys_lookup_dcookie(merge_64(a0, a1), buf, len); 323 } 324 325 SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags, 326 u64, a3, u64, a4, int, dfd, const char __user *, pathname) 327 { 328 return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4), 329 dfd, pathname); 330 } 331 332 SYSCALL_DEFINE6(32_futex, u32 __user *, uaddr, int, op, u32, val, 333 struct compat_timespec __user *, utime, u32 __user *, uaddr2, 334 u32, val3) 335 { 336 return compat_sys_futex(uaddr, op, val, utime, uaddr2, val3); 337 } 338