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 #ifdef CONFIG_SYSVIPC 123 124 SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third, 125 unsigned long, ptr, unsigned long, fifth) 126 { 127 int version, err; 128 129 version = call >> 16; /* hack for backward compatibility */ 130 call &= 0xffff; 131 132 switch (call) { 133 case SEMOP: 134 /* struct sembuf is the same on 32 and 64bit :)) */ 135 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL); 136 break; 137 case SEMTIMEDOP: 138 err = compat_sys_semtimedop(first, compat_ptr(ptr), second, 139 compat_ptr(fifth)); 140 break; 141 case SEMGET: 142 err = sys_semget(first, second, third); 143 break; 144 case SEMCTL: 145 err = compat_sys_semctl(first, second, third, compat_ptr(ptr)); 146 break; 147 case MSGSND: 148 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr)); 149 break; 150 case MSGRCV: 151 err = compat_sys_msgrcv(first, second, fifth, third, 152 version, compat_ptr(ptr)); 153 break; 154 case MSGGET: 155 err = sys_msgget((key_t) first, second); 156 break; 157 case MSGCTL: 158 err = compat_sys_msgctl(first, second, compat_ptr(ptr)); 159 break; 160 case SHMAT: 161 err = compat_sys_shmat(first, second, third, version, 162 compat_ptr(ptr)); 163 break; 164 case SHMDT: 165 err = sys_shmdt(compat_ptr(ptr)); 166 break; 167 case SHMGET: 168 err = sys_shmget(first, (unsigned)second, third); 169 break; 170 case SHMCTL: 171 err = compat_sys_shmctl(first, second, compat_ptr(ptr)); 172 break; 173 default: 174 err = -EINVAL; 175 break; 176 } 177 178 return err; 179 } 180 181 #else 182 183 SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third, 184 u32, ptr, u32, fifth) 185 { 186 return -ENOSYS; 187 } 188 189 #endif /* CONFIG_SYSVIPC */ 190 191 #ifdef CONFIG_MIPS32_N32 192 SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg) 193 { 194 /* compat_sys_semctl expects a pointer to union semun */ 195 u32 __user *uptr = compat_alloc_user_space(sizeof(u32)); 196 if (put_user(arg, uptr)) 197 return -EFAULT; 198 return compat_sys_semctl(semid, semnum, cmd, uptr); 199 } 200 201 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz, 202 int, msgflg) 203 { 204 return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp)); 205 } 206 207 SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz, 208 int, msgtyp, int, msgflg) 209 { 210 return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64, 211 compat_ptr(msgp)); 212 } 213 #endif 214 215 SYSCALL_DEFINE1(32_personality, unsigned long, personality) 216 { 217 unsigned int p = personality & 0xffffffff; 218 int ret; 219 220 if (personality(current->personality) == PER_LINUX32 && 221 personality(p) == PER_LINUX) 222 p = (p & ~PER_MASK) | PER_LINUX32; 223 ret = sys_personality(p); 224 if (ret != -1 && personality(ret) == PER_LINUX32) 225 ret = (ret & ~PER_MASK) | PER_LINUX; 226 return ret; 227 } 228 229 SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, in_fd, 230 compat_off_t __user *, offset, s32, count) 231 { 232 mm_segment_t old_fs = get_fs(); 233 int ret; 234 off_t of; 235 236 if (offset && get_user(of, offset)) 237 return -EFAULT; 238 239 set_fs(KERNEL_DS); 240 ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count); 241 set_fs(old_fs); 242 243 if (offset && put_user(of, offset)) 244 return -EFAULT; 245 246 return ret; 247 } 248 249 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3, 250 size_t count) 251 { 252 return sys_readahead(fd, merge_64(a2, a3), count); 253 } 254 255 asmlinkage long sys32_sync_file_range(int fd, int __pad, 256 unsigned long a2, unsigned long a3, 257 unsigned long a4, unsigned long a5, 258 int flags) 259 { 260 return sys_sync_file_range(fd, 261 merge_64(a2, a3), merge_64(a4, a5), 262 flags); 263 } 264 265 asmlinkage long sys32_fadvise64_64(int fd, int __pad, 266 unsigned long a2, unsigned long a3, 267 unsigned long a4, unsigned long a5, 268 int flags) 269 { 270 return sys_fadvise64_64(fd, 271 merge_64(a2, a3), merge_64(a4, a5), 272 flags); 273 } 274 275 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2, 276 unsigned offset_a3, unsigned len_a4, unsigned len_a5) 277 { 278 return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3), 279 merge_64(len_a4, len_a5)); 280 } 281 282 asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf, 283 size_t len) 284 { 285 return sys_lookup_dcookie(merge_64(a0, a1), buf, len); 286 } 287 288 SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags, 289 u64, a3, u64, a4, int, dfd, const char __user *, pathname) 290 { 291 return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4), 292 dfd, pathname); 293 } 294