1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 * Copyright (C) 2001 MIPS Technologies, Inc. 9 */ 10 #include <linux/config.h> 11 #include <linux/a.out.h> 12 #include <linux/capability.h> 13 #include <linux/errno.h> 14 #include <linux/linkage.h> 15 #include <linux/mm.h> 16 #include <linux/smp.h> 17 #include <linux/smp_lock.h> 18 #include <linux/mman.h> 19 #include <linux/ptrace.h> 20 #include <linux/sched.h> 21 #include <linux/string.h> 22 #include <linux/syscalls.h> 23 #include <linux/file.h> 24 #include <linux/slab.h> 25 #include <linux/utsname.h> 26 #include <linux/unistd.h> 27 #include <linux/sem.h> 28 #include <linux/msg.h> 29 #include <linux/shm.h> 30 #include <linux/compiler.h> 31 #include <linux/module.h> 32 33 #include <asm/branch.h> 34 #include <asm/cachectl.h> 35 #include <asm/cacheflush.h> 36 #include <asm/ipc.h> 37 #include <asm/asm-offsets.h> 38 #include <asm/signal.h> 39 #include <asm/sim.h> 40 #include <asm/shmparam.h> 41 #include <asm/sysmips.h> 42 #include <asm/uaccess.h> 43 44 asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs) 45 { 46 int fd[2]; 47 int error, res; 48 49 error = do_pipe(fd); 50 if (error) { 51 res = error; 52 goto out; 53 } 54 regs.regs[3] = fd[1]; 55 res = fd[0]; 56 out: 57 return res; 58 } 59 60 unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ 61 62 EXPORT_SYMBOL(shm_align_mask); 63 64 #define COLOUR_ALIGN(addr,pgoff) \ 65 ((((addr) + shm_align_mask) & ~shm_align_mask) + \ 66 (((pgoff) << PAGE_SHIFT) & shm_align_mask)) 67 68 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 69 unsigned long len, unsigned long pgoff, unsigned long flags) 70 { 71 struct vm_area_struct * vmm; 72 int do_color_align; 73 unsigned long task_size; 74 75 task_size = STACK_TOP; 76 77 if (flags & MAP_FIXED) { 78 /* 79 * We do not accept a shared mapping if it would violate 80 * cache aliasing constraints. 81 */ 82 if ((flags & MAP_SHARED) && (addr & shm_align_mask)) 83 return -EINVAL; 84 return addr; 85 } 86 87 if (len > task_size) 88 return -ENOMEM; 89 do_color_align = 0; 90 if (filp || (flags & MAP_SHARED)) 91 do_color_align = 1; 92 if (addr) { 93 if (do_color_align) 94 addr = COLOUR_ALIGN(addr, pgoff); 95 else 96 addr = PAGE_ALIGN(addr); 97 vmm = find_vma(current->mm, addr); 98 if (task_size - len >= addr && 99 (!vmm || addr + len <= vmm->vm_start)) 100 return addr; 101 } 102 addr = TASK_UNMAPPED_BASE; 103 if (do_color_align) 104 addr = COLOUR_ALIGN(addr, pgoff); 105 else 106 addr = PAGE_ALIGN(addr); 107 108 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 109 /* At this point: (!vmm || addr < vmm->vm_end). */ 110 if (task_size - len < addr) 111 return -ENOMEM; 112 if (!vmm || addr + len <= vmm->vm_start) 113 return addr; 114 addr = vmm->vm_end; 115 if (do_color_align) 116 addr = COLOUR_ALIGN(addr, pgoff); 117 } 118 } 119 120 /* common code for old and new mmaps */ 121 static inline unsigned long 122 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 123 unsigned long flags, unsigned long fd, unsigned long pgoff) 124 { 125 unsigned long error = -EBADF; 126 struct file * file = NULL; 127 128 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 129 if (!(flags & MAP_ANONYMOUS)) { 130 file = fget(fd); 131 if (!file) 132 goto out; 133 } 134 135 down_write(¤t->mm->mmap_sem); 136 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 137 up_write(¤t->mm->mmap_sem); 138 139 if (file) 140 fput(file); 141 out: 142 return error; 143 } 144 145 asmlinkage unsigned long 146 old_mmap(unsigned long addr, unsigned long len, int prot, 147 int flags, int fd, off_t offset) 148 { 149 unsigned long result; 150 151 result = -EINVAL; 152 if (offset & ~PAGE_MASK) 153 goto out; 154 155 result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 156 157 out: 158 return result; 159 } 160 161 asmlinkage unsigned long 162 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 163 unsigned long flags, unsigned long fd, unsigned long pgoff) 164 { 165 return do_mmap2(addr, len, prot, flags, fd, pgoff); 166 } 167 168 save_static_function(sys_fork); 169 __attribute_used__ noinline static int 170 _sys_fork(nabi_no_regargs struct pt_regs regs) 171 { 172 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); 173 } 174 175 save_static_function(sys_clone); 176 __attribute_used__ noinline static int 177 _sys_clone(nabi_no_regargs struct pt_regs regs) 178 { 179 unsigned long clone_flags; 180 unsigned long newsp; 181 int __user *parent_tidptr, *child_tidptr; 182 183 clone_flags = regs.regs[4]; 184 newsp = regs.regs[5]; 185 if (!newsp) 186 newsp = regs.regs[29]; 187 parent_tidptr = (int __user *) regs.regs[6]; 188 #ifdef CONFIG_32BIT 189 /* We need to fetch the fifth argument off the stack. */ 190 child_tidptr = NULL; 191 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { 192 int __user *__user *usp = (int __user *__user *) regs.regs[29]; 193 if (regs.regs[2] == __NR_syscall) { 194 if (get_user (child_tidptr, &usp[5])) 195 return -EFAULT; 196 } 197 else if (get_user (child_tidptr, &usp[4])) 198 return -EFAULT; 199 } 200 #else 201 child_tidptr = (int __user *) regs.regs[8]; 202 #endif 203 return do_fork(clone_flags, newsp, ®s, 0, 204 parent_tidptr, child_tidptr); 205 } 206 207 /* 208 * sys_execve() executes a new program. 209 */ 210 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) 211 { 212 int error; 213 char * filename; 214 215 filename = getname((char __user *) (long)regs.regs[4]); 216 error = PTR_ERR(filename); 217 if (IS_ERR(filename)) 218 goto out; 219 error = do_execve(filename, (char __user *__user *) (long)regs.regs[5], 220 (char __user *__user *) (long)regs.regs[6], ®s); 221 putname(filename); 222 223 out: 224 return error; 225 } 226 227 /* 228 * Compacrapability ... 229 */ 230 asmlinkage int sys_uname(struct old_utsname __user * name) 231 { 232 if (name && !copy_to_user(name, &system_utsname, sizeof (*name))) 233 return 0; 234 return -EFAULT; 235 } 236 237 /* 238 * Compacrapability ... 239 */ 240 asmlinkage int sys_olduname(struct oldold_utsname __user * name) 241 { 242 int error; 243 244 if (!name) 245 return -EFAULT; 246 if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) 247 return -EFAULT; 248 249 error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN); 250 error -= __put_user(0,name->sysname+__OLD_UTS_LEN); 251 error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN); 252 error -= __put_user(0,name->nodename+__OLD_UTS_LEN); 253 error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN); 254 error -= __put_user(0,name->release+__OLD_UTS_LEN); 255 error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN); 256 error -= __put_user(0,name->version+__OLD_UTS_LEN); 257 error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN); 258 error = __put_user(0,name->machine+__OLD_UTS_LEN); 259 error = error ? -EFAULT : 0; 260 261 return error; 262 } 263 264 void sys_set_thread_area(unsigned long addr) 265 { 266 struct thread_info *ti = task_thread_info(current); 267 268 ti->tp_value = addr; 269 270 /* If some future MIPS implementation has this register in hardware, 271 * we will need to update it here (and in context switches). */ 272 } 273 274 asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3) 275 { 276 int tmp, len; 277 char __user *name; 278 279 switch(cmd) { 280 case SETNAME: { 281 char nodename[__NEW_UTS_LEN + 1]; 282 283 if (!capable(CAP_SYS_ADMIN)) 284 return -EPERM; 285 286 name = (char __user *) arg1; 287 288 len = strncpy_from_user(nodename, name, __NEW_UTS_LEN); 289 if (len < 0) 290 return -EFAULT; 291 292 down_write(&uts_sem); 293 strncpy(system_utsname.nodename, nodename, len); 294 nodename[__NEW_UTS_LEN] = '\0'; 295 strlcpy(system_utsname.nodename, nodename, 296 sizeof(system_utsname.nodename)); 297 up_write(&uts_sem); 298 return 0; 299 } 300 301 case MIPS_ATOMIC_SET: 302 printk(KERN_CRIT "How did I get here?\n"); 303 return -EINVAL; 304 305 case MIPS_FIXADE: 306 tmp = current->thread.mflags & ~3; 307 current->thread.mflags = tmp | (arg1 & 3); 308 return 0; 309 310 case FLUSH_CACHE: 311 __flush_cache_all(); 312 return 0; 313 314 case MIPS_RDNVRAM: 315 return -EIO; 316 } 317 318 return -EINVAL; 319 } 320 321 /* 322 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 323 * 324 * This is really horribly ugly. 325 */ 326 asmlinkage int sys_ipc (uint call, int first, int second, 327 unsigned long third, void __user *ptr, long fifth) 328 { 329 int version, ret; 330 331 version = call >> 16; /* hack for backward compatibility */ 332 call &= 0xffff; 333 334 switch (call) { 335 case SEMOP: 336 return sys_semtimedop (first, (struct sembuf __user *)ptr, 337 second, NULL); 338 case SEMTIMEDOP: 339 return sys_semtimedop (first, (struct sembuf __user *)ptr, 340 second, 341 (const struct timespec __user *)fifth); 342 case SEMGET: 343 return sys_semget (first, second, third); 344 case SEMCTL: { 345 union semun fourth; 346 if (!ptr) 347 return -EINVAL; 348 if (get_user(fourth.__pad, (void *__user *) ptr)) 349 return -EFAULT; 350 return sys_semctl (first, second, third, fourth); 351 } 352 353 case MSGSND: 354 return sys_msgsnd (first, (struct msgbuf __user *) ptr, 355 second, third); 356 case MSGRCV: 357 switch (version) { 358 case 0: { 359 struct ipc_kludge tmp; 360 if (!ptr) 361 return -EINVAL; 362 363 if (copy_from_user(&tmp, 364 (struct ipc_kludge __user *) ptr, 365 sizeof (tmp))) 366 return -EFAULT; 367 return sys_msgrcv (first, tmp.msgp, second, 368 tmp.msgtyp, third); 369 } 370 default: 371 return sys_msgrcv (first, 372 (struct msgbuf __user *) ptr, 373 second, fifth, third); 374 } 375 case MSGGET: 376 return sys_msgget ((key_t) first, second); 377 case MSGCTL: 378 return sys_msgctl (first, second, 379 (struct msqid_ds __user *) ptr); 380 381 case SHMAT: 382 switch (version) { 383 default: { 384 ulong raddr; 385 ret = do_shmat (first, (char __user *) ptr, second, 386 &raddr); 387 if (ret) 388 return ret; 389 return put_user (raddr, (ulong __user *) third); 390 } 391 case 1: /* iBCS2 emulator entry point */ 392 if (!segment_eq(get_fs(), get_ds())) 393 return -EINVAL; 394 return do_shmat (first, (char __user *) ptr, second, 395 (ulong *) third); 396 } 397 case SHMDT: 398 return sys_shmdt ((char __user *)ptr); 399 case SHMGET: 400 return sys_shmget (first, second, third); 401 case SHMCTL: 402 return sys_shmctl (first, second, 403 (struct shmid_ds __user *) ptr); 404 default: 405 return -ENOSYS; 406 } 407 } 408 409 /* 410 * No implemented yet ... 411 */ 412 asmlinkage int sys_cachectl(char *addr, int nbytes, int op) 413 { 414 return -ENOSYS; 415 } 416 417 /* 418 * If we ever come here the user sp is bad. Zap the process right away. 419 * Due to the bad stack signaling wouldn't work. 420 */ 421 asmlinkage void bad_stack(void) 422 { 423 do_exit(SIGSEGV); 424 } 425