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/capability.h> 11 #include <linux/errno.h> 12 #include <linux/linkage.h> 13 #include <linux/mm.h> 14 #include <linux/fs.h> 15 #include <linux/smp.h> 16 #include <linux/mman.h> 17 #include <linux/ptrace.h> 18 #include <linux/sched.h> 19 #include <linux/string.h> 20 #include <linux/syscalls.h> 21 #include <linux/file.h> 22 #include <linux/slab.h> 23 #include <linux/utsname.h> 24 #include <linux/unistd.h> 25 #include <linux/sem.h> 26 #include <linux/msg.h> 27 #include <linux/shm.h> 28 #include <linux/compiler.h> 29 #include <linux/module.h> 30 #include <linux/ipc.h> 31 #include <linux/uaccess.h> 32 33 #include <asm/asm.h> 34 #include <asm/branch.h> 35 #include <asm/cachectl.h> 36 #include <asm/cacheflush.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 /* 45 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling 46 * convention. It returns results in registers $v0 / $v1 which means there 47 * is no need for it to do verify the validity of a userspace pointer 48 * argument. Historically that used to be expensive in Linux. These days 49 * the performance advantage is negligible. 50 */ 51 asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs) 52 { 53 int fd[2]; 54 int error, res; 55 56 error = do_pipe_flags(fd, 0); 57 if (error) { 58 res = error; 59 goto out; 60 } 61 regs.regs[3] = fd[1]; 62 res = fd[0]; 63 out: 64 return res; 65 } 66 67 unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ 68 69 EXPORT_SYMBOL(shm_align_mask); 70 71 #define COLOUR_ALIGN(addr,pgoff) \ 72 ((((addr) + shm_align_mask) & ~shm_align_mask) + \ 73 (((pgoff) << PAGE_SHIFT) & shm_align_mask)) 74 75 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 76 unsigned long len, unsigned long pgoff, unsigned long flags) 77 { 78 struct vm_area_struct * vmm; 79 int do_color_align; 80 unsigned long task_size; 81 82 task_size = STACK_TOP; 83 84 if (len > task_size) 85 return -ENOMEM; 86 87 if (flags & MAP_FIXED) { 88 /* Even MAP_FIXED mappings must reside within task_size. */ 89 if (task_size - len < addr) 90 return -EINVAL; 91 92 /* 93 * We do not accept a shared mapping if it would violate 94 * cache aliasing constraints. 95 */ 96 if ((flags & MAP_SHARED) && (addr & shm_align_mask)) 97 return -EINVAL; 98 return addr; 99 } 100 101 do_color_align = 0; 102 if (filp || (flags & MAP_SHARED)) 103 do_color_align = 1; 104 if (addr) { 105 if (do_color_align) 106 addr = COLOUR_ALIGN(addr, pgoff); 107 else 108 addr = PAGE_ALIGN(addr); 109 vmm = find_vma(current->mm, addr); 110 if (task_size - len >= addr && 111 (!vmm || addr + len <= vmm->vm_start)) 112 return addr; 113 } 114 addr = TASK_UNMAPPED_BASE; 115 if (do_color_align) 116 addr = COLOUR_ALIGN(addr, pgoff); 117 else 118 addr = PAGE_ALIGN(addr); 119 120 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 121 /* At this point: (!vmm || addr < vmm->vm_end). */ 122 if (task_size - len < addr) 123 return -ENOMEM; 124 if (!vmm || addr + len <= vmm->vm_start) 125 return addr; 126 addr = vmm->vm_end; 127 if (do_color_align) 128 addr = COLOUR_ALIGN(addr, pgoff); 129 } 130 } 131 132 /* common code for old and new mmaps */ 133 static inline unsigned long 134 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 135 unsigned long flags, unsigned long fd, unsigned long pgoff) 136 { 137 unsigned long error = -EBADF; 138 struct file * file = NULL; 139 140 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 141 if (!(flags & MAP_ANONYMOUS)) { 142 file = fget(fd); 143 if (!file) 144 goto out; 145 } 146 147 down_write(¤t->mm->mmap_sem); 148 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 149 up_write(¤t->mm->mmap_sem); 150 151 if (file) 152 fput(file); 153 out: 154 return error; 155 } 156 157 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, 158 unsigned long, prot, unsigned long, flags, unsigned long, 159 fd, off_t, offset) 160 { 161 unsigned long result; 162 163 result = -EINVAL; 164 if (offset & ~PAGE_MASK) 165 goto out; 166 167 result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 168 169 out: 170 return result; 171 } 172 173 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, 174 unsigned long, prot, unsigned long, flags, unsigned long, fd, 175 unsigned long, pgoff) 176 { 177 if (pgoff & (~PAGE_MASK >> 12)) 178 return -EINVAL; 179 180 return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); 181 } 182 183 save_static_function(sys_fork); 184 static int __used noinline 185 _sys_fork(nabi_no_regargs struct pt_regs regs) 186 { 187 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); 188 } 189 190 save_static_function(sys_clone); 191 static int __used noinline 192 _sys_clone(nabi_no_regargs struct pt_regs regs) 193 { 194 unsigned long clone_flags; 195 unsigned long newsp; 196 int __user *parent_tidptr, *child_tidptr; 197 198 clone_flags = regs.regs[4]; 199 newsp = regs.regs[5]; 200 if (!newsp) 201 newsp = regs.regs[29]; 202 parent_tidptr = (int __user *) regs.regs[6]; 203 #ifdef CONFIG_32BIT 204 /* We need to fetch the fifth argument off the stack. */ 205 child_tidptr = NULL; 206 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { 207 int __user *__user *usp = (int __user *__user *) regs.regs[29]; 208 if (regs.regs[2] == __NR_syscall) { 209 if (get_user (child_tidptr, &usp[5])) 210 return -EFAULT; 211 } 212 else if (get_user (child_tidptr, &usp[4])) 213 return -EFAULT; 214 } 215 #else 216 child_tidptr = (int __user *) regs.regs[8]; 217 #endif 218 return do_fork(clone_flags, newsp, ®s, 0, 219 parent_tidptr, child_tidptr); 220 } 221 222 /* 223 * sys_execve() executes a new program. 224 */ 225 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) 226 { 227 int error; 228 char * filename; 229 230 filename = getname((char __user *) (long)regs.regs[4]); 231 error = PTR_ERR(filename); 232 if (IS_ERR(filename)) 233 goto out; 234 error = do_execve(filename, (char __user *__user *) (long)regs.regs[5], 235 (char __user *__user *) (long)regs.regs[6], ®s); 236 putname(filename); 237 238 out: 239 return error; 240 } 241 242 /* 243 * Compacrapability ... 244 */ 245 SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) 246 { 247 if (name && !copy_to_user(name, utsname(), sizeof (*name))) 248 return 0; 249 return -EFAULT; 250 } 251 252 /* 253 * Compacrapability ... 254 */ 255 SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) 256 { 257 int error; 258 259 if (!name) 260 return -EFAULT; 261 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) 262 return -EFAULT; 263 264 error = __copy_to_user(&name->sysname, &utsname()->sysname, 265 __OLD_UTS_LEN); 266 error -= __put_user(0, name->sysname + __OLD_UTS_LEN); 267 error -= __copy_to_user(&name->nodename, &utsname()->nodename, 268 __OLD_UTS_LEN); 269 error -= __put_user(0, name->nodename + __OLD_UTS_LEN); 270 error -= __copy_to_user(&name->release, &utsname()->release, 271 __OLD_UTS_LEN); 272 error -= __put_user(0, name->release + __OLD_UTS_LEN); 273 error -= __copy_to_user(&name->version, &utsname()->version, 274 __OLD_UTS_LEN); 275 error -= __put_user(0, name->version + __OLD_UTS_LEN); 276 error -= __copy_to_user(&name->machine, &utsname()->machine, 277 __OLD_UTS_LEN); 278 error = __put_user(0, name->machine + __OLD_UTS_LEN); 279 error = error ? -EFAULT : 0; 280 281 return error; 282 } 283 284 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) 285 { 286 struct thread_info *ti = task_thread_info(current); 287 288 ti->tp_value = addr; 289 if (cpu_has_userlocal) 290 write_c0_userlocal(addr); 291 292 return 0; 293 } 294 295 static inline int mips_atomic_set(struct pt_regs *regs, 296 unsigned long addr, unsigned long new) 297 { 298 unsigned long old, tmp; 299 unsigned int err; 300 301 if (unlikely(addr & 3)) 302 return -EINVAL; 303 304 if (unlikely(!access_ok(VERIFY_WRITE, addr, 4))) 305 return -EINVAL; 306 307 if (cpu_has_llsc && R10000_LLSC_WAR) { 308 __asm__ __volatile__ ( 309 " .set mips3 \n" 310 " li %[err], 0 \n" 311 "1: ll %[old], (%[addr]) \n" 312 " move %[tmp], %[new] \n" 313 "2: sc %[tmp], (%[addr]) \n" 314 " beqzl %[tmp], 1b \n" 315 "3: \n" 316 " .section .fixup,\"ax\" \n" 317 "4: li %[err], %[efault] \n" 318 " j 3b \n" 319 " .previous \n" 320 " .section __ex_table,\"a\" \n" 321 " "STR(PTR)" 1b, 4b \n" 322 " "STR(PTR)" 2b, 4b \n" 323 " .previous \n" 324 " .set mips0 \n" 325 : [old] "=&r" (old), 326 [err] "=&r" (err), 327 [tmp] "=&r" (tmp) 328 : [addr] "r" (addr), 329 [new] "r" (new), 330 [efault] "i" (-EFAULT) 331 : "memory"); 332 } else if (cpu_has_llsc) { 333 __asm__ __volatile__ ( 334 " .set mips3 \n" 335 " li %[err], 0 \n" 336 "1: ll %[old], (%[addr]) \n" 337 " move %[tmp], %[new] \n" 338 "2: sc %[tmp], (%[addr]) \n" 339 " bnez %[tmp], 4f \n" 340 "3: \n" 341 " .subsection 2 \n" 342 "4: b 1b \n" 343 " .previous \n" 344 " \n" 345 " .section .fixup,\"ax\" \n" 346 "5: li %[err], %[efault] \n" 347 " j 3b \n" 348 " .previous \n" 349 " .section __ex_table,\"a\" \n" 350 " "STR(PTR)" 1b, 5b \n" 351 " "STR(PTR)" 2b, 5b \n" 352 " .previous \n" 353 " .set mips0 \n" 354 : [old] "=&r" (old), 355 [err] "=&r" (err), 356 [tmp] "=&r" (tmp) 357 : [addr] "r" (addr), 358 [new] "r" (new), 359 [efault] "i" (-EFAULT) 360 : "memory"); 361 } else { 362 do { 363 preempt_disable(); 364 ll_bit = 1; 365 ll_task = current; 366 preempt_enable(); 367 368 err = __get_user(old, (unsigned int *) addr); 369 err |= __put_user(new, (unsigned int *) addr); 370 if (err) 371 break; 372 rmb(); 373 } while (!ll_bit); 374 } 375 376 if (unlikely(err)) 377 return err; 378 379 regs->regs[2] = old; 380 regs->regs[7] = 0; /* No error */ 381 382 /* 383 * Don't let your children do this ... 384 */ 385 __asm__ __volatile__( 386 " move $29, %0 \n" 387 " j syscall_exit \n" 388 : /* no outputs */ 389 : "r" (regs)); 390 391 /* unreached. Honestly. */ 392 while (1); 393 } 394 395 save_static_function(sys_sysmips); 396 static int __used noinline 397 _sys_sysmips(nabi_no_regargs struct pt_regs regs) 398 { 399 long cmd, arg1, arg2, arg3; 400 401 cmd = regs.regs[4]; 402 arg1 = regs.regs[5]; 403 arg2 = regs.regs[6]; 404 arg3 = regs.regs[7]; 405 406 switch (cmd) { 407 case MIPS_ATOMIC_SET: 408 return mips_atomic_set(®s, arg1, arg2); 409 410 case MIPS_FIXADE: 411 if (arg1 & ~3) 412 return -EINVAL; 413 414 if (arg1 & 1) 415 set_thread_flag(TIF_FIXADE); 416 else 417 clear_thread_flag(TIF_FIXADE); 418 if (arg1 & 2) 419 set_thread_flag(TIF_LOGADE); 420 else 421 clear_thread_flag(TIF_FIXADE); 422 423 return 0; 424 425 case FLUSH_CACHE: 426 __flush_cache_all(); 427 return 0; 428 } 429 430 return -EINVAL; 431 } 432 433 /* 434 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 435 * 436 * This is really horribly ugly. 437 */ 438 SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, int, second, 439 unsigned long, third, void __user *, ptr, long, fifth) 440 { 441 int version, ret; 442 443 version = call >> 16; /* hack for backward compatibility */ 444 call &= 0xffff; 445 446 switch (call) { 447 case SEMOP: 448 return sys_semtimedop(first, (struct sembuf __user *)ptr, 449 second, NULL); 450 case SEMTIMEDOP: 451 return sys_semtimedop(first, (struct sembuf __user *)ptr, 452 second, 453 (const struct timespec __user *)fifth); 454 case SEMGET: 455 return sys_semget(first, second, third); 456 case SEMCTL: { 457 union semun fourth; 458 if (!ptr) 459 return -EINVAL; 460 if (get_user(fourth.__pad, (void __user *__user *) ptr)) 461 return -EFAULT; 462 return sys_semctl(first, second, third, fourth); 463 } 464 465 case MSGSND: 466 return sys_msgsnd(first, (struct msgbuf __user *) ptr, 467 second, third); 468 case MSGRCV: 469 switch (version) { 470 case 0: { 471 struct ipc_kludge tmp; 472 if (!ptr) 473 return -EINVAL; 474 475 if (copy_from_user(&tmp, 476 (struct ipc_kludge __user *) ptr, 477 sizeof(tmp))) 478 return -EFAULT; 479 return sys_msgrcv(first, tmp.msgp, second, 480 tmp.msgtyp, third); 481 } 482 default: 483 return sys_msgrcv(first, 484 (struct msgbuf __user *) ptr, 485 second, fifth, third); 486 } 487 case MSGGET: 488 return sys_msgget((key_t) first, second); 489 case MSGCTL: 490 return sys_msgctl(first, second, 491 (struct msqid_ds __user *) ptr); 492 493 case SHMAT: 494 switch (version) { 495 default: { 496 unsigned long raddr; 497 ret = do_shmat(first, (char __user *) ptr, second, 498 &raddr); 499 if (ret) 500 return ret; 501 return put_user(raddr, (unsigned long __user *) third); 502 } 503 case 1: /* iBCS2 emulator entry point */ 504 if (!segment_eq(get_fs(), get_ds())) 505 return -EINVAL; 506 return do_shmat(first, (char __user *) ptr, second, 507 (unsigned long *) third); 508 } 509 case SHMDT: 510 return sys_shmdt((char __user *)ptr); 511 case SHMGET: 512 return sys_shmget(first, second, third); 513 case SHMCTL: 514 return sys_shmctl(first, second, 515 (struct shmid_ds __user *) ptr); 516 default: 517 return -ENOSYS; 518 } 519 } 520 521 /* 522 * No implemented yet ... 523 */ 524 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) 525 { 526 return -ENOSYS; 527 } 528 529 /* 530 * If we ever come here the user sp is bad. Zap the process right away. 531 * Due to the bad stack signaling wouldn't work. 532 */ 533 asmlinkage void bad_stack(void) 534 { 535 do_exit(SIGSEGV); 536 } 537 538 /* 539 * Do a system call from kernel instead of calling sys_execve so we 540 * end up with proper pt_regs. 541 */ 542 int kernel_execve(const char *filename, char *const argv[], char *const envp[]) 543 { 544 register unsigned long __a0 asm("$4") = (unsigned long) filename; 545 register unsigned long __a1 asm("$5") = (unsigned long) argv; 546 register unsigned long __a2 asm("$6") = (unsigned long) envp; 547 register unsigned long __a3 asm("$7"); 548 unsigned long __v0; 549 550 __asm__ volatile (" \n" 551 " .set noreorder \n" 552 " li $2, %5 # __NR_execve \n" 553 " syscall \n" 554 " move %0, $2 \n" 555 " .set reorder \n" 556 : "=&r" (__v0), "=r" (__a3) 557 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) 558 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", 559 "memory"); 560 561 if (__a3 == 0) 562 return __v0; 563 564 return -__v0; 565 } 566