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 " li %[err], 0 \n" 310 "1: ll %[old], (%[addr]) \n" 311 " move %[tmp], %[new] \n" 312 "2: sc %[tmp], (%[addr]) \n" 313 " beqzl %[tmp], 1b \n" 314 "3: \n" 315 " .section .fixup,\"ax\" \n" 316 "4: li %[err], %[efault] \n" 317 " j 3b \n" 318 " .previous \n" 319 " .section __ex_table,\"a\" \n" 320 " "STR(PTR)" 1b, 4b \n" 321 " "STR(PTR)" 2b, 4b \n" 322 " .previous \n" 323 : [old] "=&r" (old), 324 [err] "=&r" (err), 325 [tmp] "=&r" (tmp) 326 : [addr] "r" (addr), 327 [new] "r" (new), 328 [efault] "i" (-EFAULT) 329 : "memory"); 330 } else if (cpu_has_llsc) { 331 __asm__ __volatile__ ( 332 " li %[err], 0 \n" 333 "1: ll %[old], (%[addr]) \n" 334 " move %[tmp], %[new] \n" 335 "2: sc %[tmp], (%[addr]) \n" 336 " bnez %[tmp], 4f \n" 337 "3: \n" 338 " .subsection 2 \n" 339 "4: b 1b \n" 340 " .previous \n" 341 " \n" 342 " .section .fixup,\"ax\" \n" 343 "5: li %[err], %[efault] \n" 344 " j 3b \n" 345 " .previous \n" 346 " .section __ex_table,\"a\" \n" 347 " "STR(PTR)" 1b, 5b \n" 348 " "STR(PTR)" 2b, 5b \n" 349 " .previous \n" 350 : [old] "=&r" (old), 351 [err] "=&r" (err), 352 [tmp] "=&r" (tmp) 353 : [addr] "r" (addr), 354 [new] "r" (new), 355 [efault] "i" (-EFAULT) 356 : "memory"); 357 } else { 358 do { 359 preempt_disable(); 360 ll_bit = 1; 361 ll_task = current; 362 preempt_enable(); 363 364 err = __get_user(old, (unsigned int *) addr); 365 err |= __put_user(new, (unsigned int *) addr); 366 if (err) 367 break; 368 rmb(); 369 } while (!ll_bit); 370 } 371 372 if (unlikely(err)) 373 return err; 374 375 regs->regs[2] = old; 376 regs->regs[7] = 0; /* No error */ 377 378 /* 379 * Don't let your children do this ... 380 */ 381 __asm__ __volatile__( 382 " move $29, %0 \n" 383 " j syscall_exit \n" 384 : /* no outputs */ 385 : "r" (regs)); 386 387 /* unreached. Honestly. */ 388 while (1); 389 } 390 391 save_static_function(sys_sysmips); 392 static int __used noinline 393 _sys_sysmips(nabi_no_regargs struct pt_regs regs) 394 { 395 long cmd, arg1, arg2, arg3; 396 397 cmd = regs.regs[4]; 398 arg1 = regs.regs[5]; 399 arg2 = regs.regs[6]; 400 arg3 = regs.regs[7]; 401 402 switch (cmd) { 403 case MIPS_ATOMIC_SET: 404 return mips_atomic_set(®s, arg1, arg2); 405 406 case MIPS_FIXADE: 407 if (arg1 & ~3) 408 return -EINVAL; 409 410 if (arg1 & 1) 411 set_thread_flag(TIF_FIXADE); 412 else 413 clear_thread_flag(TIF_FIXADE); 414 if (arg1 & 2) 415 set_thread_flag(TIF_LOGADE); 416 else 417 clear_thread_flag(TIF_FIXADE); 418 419 return 0; 420 421 case FLUSH_CACHE: 422 __flush_cache_all(); 423 return 0; 424 } 425 426 return -EINVAL; 427 } 428 429 /* 430 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 431 * 432 * This is really horribly ugly. 433 */ 434 SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, int, second, 435 unsigned long, third, void __user *, ptr, long, fifth) 436 { 437 int version, ret; 438 439 version = call >> 16; /* hack for backward compatibility */ 440 call &= 0xffff; 441 442 switch (call) { 443 case SEMOP: 444 return sys_semtimedop(first, (struct sembuf __user *)ptr, 445 second, NULL); 446 case SEMTIMEDOP: 447 return sys_semtimedop(first, (struct sembuf __user *)ptr, 448 second, 449 (const struct timespec __user *)fifth); 450 case SEMGET: 451 return sys_semget(first, second, third); 452 case SEMCTL: { 453 union semun fourth; 454 if (!ptr) 455 return -EINVAL; 456 if (get_user(fourth.__pad, (void __user *__user *) ptr)) 457 return -EFAULT; 458 return sys_semctl(first, second, third, fourth); 459 } 460 461 case MSGSND: 462 return sys_msgsnd(first, (struct msgbuf __user *) ptr, 463 second, third); 464 case MSGRCV: 465 switch (version) { 466 case 0: { 467 struct ipc_kludge tmp; 468 if (!ptr) 469 return -EINVAL; 470 471 if (copy_from_user(&tmp, 472 (struct ipc_kludge __user *) ptr, 473 sizeof(tmp))) 474 return -EFAULT; 475 return sys_msgrcv(first, tmp.msgp, second, 476 tmp.msgtyp, third); 477 } 478 default: 479 return sys_msgrcv(first, 480 (struct msgbuf __user *) ptr, 481 second, fifth, third); 482 } 483 case MSGGET: 484 return sys_msgget((key_t) first, second); 485 case MSGCTL: 486 return sys_msgctl(first, second, 487 (struct msqid_ds __user *) ptr); 488 489 case SHMAT: 490 switch (version) { 491 default: { 492 unsigned long raddr; 493 ret = do_shmat(first, (char __user *) ptr, second, 494 &raddr); 495 if (ret) 496 return ret; 497 return put_user(raddr, (unsigned long __user *) third); 498 } 499 case 1: /* iBCS2 emulator entry point */ 500 if (!segment_eq(get_fs(), get_ds())) 501 return -EINVAL; 502 return do_shmat(first, (char __user *) ptr, second, 503 (unsigned long *) third); 504 } 505 case SHMDT: 506 return sys_shmdt((char __user *)ptr); 507 case SHMGET: 508 return sys_shmget(first, second, third); 509 case SHMCTL: 510 return sys_shmctl(first, second, 511 (struct shmid_ds __user *) ptr); 512 default: 513 return -ENOSYS; 514 } 515 } 516 517 /* 518 * No implemented yet ... 519 */ 520 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) 521 { 522 return -ENOSYS; 523 } 524 525 /* 526 * If we ever come here the user sp is bad. Zap the process right away. 527 * Due to the bad stack signaling wouldn't work. 528 */ 529 asmlinkage void bad_stack(void) 530 { 531 do_exit(SIGSEGV); 532 } 533 534 /* 535 * Do a system call from kernel instead of calling sys_execve so we 536 * end up with proper pt_regs. 537 */ 538 int kernel_execve(const char *filename, char *const argv[], char *const envp[]) 539 { 540 register unsigned long __a0 asm("$4") = (unsigned long) filename; 541 register unsigned long __a1 asm("$5") = (unsigned long) argv; 542 register unsigned long __a2 asm("$6") = (unsigned long) envp; 543 register unsigned long __a3 asm("$7"); 544 unsigned long __v0; 545 546 __asm__ volatile (" \n" 547 " .set noreorder \n" 548 " li $2, %5 # __NR_execve \n" 549 " syscall \n" 550 " move %0, $2 \n" 551 " .set reorder \n" 552 : "=&r" (__v0), "=r" (__a3) 553 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) 554 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", 555 "memory"); 556 557 if (__a3 == 0) 558 return __v0; 559 560 return -__v0; 561 } 562