1 /* linux/arch/sparc64/kernel/sys_sparc.c 2 * 3 * This file contains various random system calls that 4 * have a non-standard calling sequence on the Linux/sparc 5 * platform. 6 */ 7 8 #include <linux/errno.h> 9 #include <linux/types.h> 10 #include <linux/sched.h> 11 #include <linux/fs.h> 12 #include <linux/file.h> 13 #include <linux/mm.h> 14 #include <linux/sem.h> 15 #include <linux/msg.h> 16 #include <linux/shm.h> 17 #include <linux/stat.h> 18 #include <linux/mman.h> 19 #include <linux/utsname.h> 20 #include <linux/smp.h> 21 #include <linux/slab.h> 22 #include <linux/syscalls.h> 23 #include <linux/ipc.h> 24 #include <linux/personality.h> 25 #include <linux/random.h> 26 #include <linux/export.h> 27 #include <linux/context_tracking.h> 28 29 #include <asm/uaccess.h> 30 #include <asm/utrap.h> 31 #include <asm/unistd.h> 32 33 #include "entry.h" 34 #include "systbls.h" 35 36 /* #define DEBUG_UNIMP_SYSCALL */ 37 38 asmlinkage unsigned long sys_getpagesize(void) 39 { 40 return PAGE_SIZE; 41 } 42 43 /* Does addr --> addr+len fall within 4GB of the VA-space hole or 44 * overflow past the end of the 64-bit address space? 45 */ 46 static inline int invalid_64bit_range(unsigned long addr, unsigned long len) 47 { 48 unsigned long va_exclude_start, va_exclude_end; 49 50 va_exclude_start = VA_EXCLUDE_START; 51 va_exclude_end = VA_EXCLUDE_END; 52 53 if (unlikely(len >= va_exclude_start)) 54 return 1; 55 56 if (unlikely((addr + len) < addr)) 57 return 1; 58 59 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) || 60 ((addr + len) >= va_exclude_start && 61 (addr + len) < va_exclude_end))) 62 return 1; 63 64 return 0; 65 } 66 67 /* These functions differ from the default implementations in 68 * mm/mmap.c in two ways: 69 * 70 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align, 71 * for fixed such mappings we just validate what the user gave us. 72 * 2) For 64-bit tasks we avoid mapping anything within 4GB of 73 * the spitfire/niagara VA-hole. 74 */ 75 76 static inline unsigned long COLOR_ALIGN(unsigned long addr, 77 unsigned long pgoff) 78 { 79 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1); 80 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1); 81 82 return base + off; 83 } 84 85 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 86 { 87 struct mm_struct *mm = current->mm; 88 struct vm_area_struct * vma; 89 unsigned long task_size = TASK_SIZE; 90 int do_color_align; 91 struct vm_unmapped_area_info info; 92 93 if (flags & MAP_FIXED) { 94 /* We do not accept a shared mapping if it would violate 95 * cache aliasing constraints. 96 */ 97 if ((flags & MAP_SHARED) && 98 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 99 return -EINVAL; 100 return addr; 101 } 102 103 if (test_thread_flag(TIF_32BIT)) 104 task_size = STACK_TOP32; 105 if (unlikely(len > task_size || len >= VA_EXCLUDE_START)) 106 return -ENOMEM; 107 108 do_color_align = 0; 109 if (filp || (flags & MAP_SHARED)) 110 do_color_align = 1; 111 112 if (addr) { 113 if (do_color_align) 114 addr = COLOR_ALIGN(addr, pgoff); 115 else 116 addr = PAGE_ALIGN(addr); 117 118 vma = find_vma(mm, addr); 119 if (task_size - len >= addr && 120 (!vma || addr + len <= vma->vm_start)) 121 return addr; 122 } 123 124 info.flags = 0; 125 info.length = len; 126 info.low_limit = TASK_UNMAPPED_BASE; 127 info.high_limit = min(task_size, VA_EXCLUDE_START); 128 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; 129 info.align_offset = pgoff << PAGE_SHIFT; 130 addr = vm_unmapped_area(&info); 131 132 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) { 133 VM_BUG_ON(addr != -ENOMEM); 134 info.low_limit = VA_EXCLUDE_END; 135 info.high_limit = task_size; 136 addr = vm_unmapped_area(&info); 137 } 138 139 return addr; 140 } 141 142 unsigned long 143 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 144 const unsigned long len, const unsigned long pgoff, 145 const unsigned long flags) 146 { 147 struct vm_area_struct *vma; 148 struct mm_struct *mm = current->mm; 149 unsigned long task_size = STACK_TOP32; 150 unsigned long addr = addr0; 151 int do_color_align; 152 struct vm_unmapped_area_info info; 153 154 /* This should only ever run for 32-bit processes. */ 155 BUG_ON(!test_thread_flag(TIF_32BIT)); 156 157 if (flags & MAP_FIXED) { 158 /* We do not accept a shared mapping if it would violate 159 * cache aliasing constraints. 160 */ 161 if ((flags & MAP_SHARED) && 162 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 163 return -EINVAL; 164 return addr; 165 } 166 167 if (unlikely(len > task_size)) 168 return -ENOMEM; 169 170 do_color_align = 0; 171 if (filp || (flags & MAP_SHARED)) 172 do_color_align = 1; 173 174 /* requesting a specific address */ 175 if (addr) { 176 if (do_color_align) 177 addr = COLOR_ALIGN(addr, pgoff); 178 else 179 addr = PAGE_ALIGN(addr); 180 181 vma = find_vma(mm, addr); 182 if (task_size - len >= addr && 183 (!vma || addr + len <= vma->vm_start)) 184 return addr; 185 } 186 187 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 188 info.length = len; 189 info.low_limit = PAGE_SIZE; 190 info.high_limit = mm->mmap_base; 191 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; 192 info.align_offset = pgoff << PAGE_SHIFT; 193 addr = vm_unmapped_area(&info); 194 195 /* 196 * A failed mmap() very likely causes application failure, 197 * so fall back to the bottom-up function here. This scenario 198 * can happen with large stack limits and large mmap() 199 * allocations. 200 */ 201 if (addr & ~PAGE_MASK) { 202 VM_BUG_ON(addr != -ENOMEM); 203 info.flags = 0; 204 info.low_limit = TASK_UNMAPPED_BASE; 205 info.high_limit = STACK_TOP32; 206 addr = vm_unmapped_area(&info); 207 } 208 209 return addr; 210 } 211 212 /* Try to align mapping such that we align it as much as possible. */ 213 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags) 214 { 215 unsigned long align_goal, addr = -ENOMEM; 216 unsigned long (*get_area)(struct file *, unsigned long, 217 unsigned long, unsigned long, unsigned long); 218 219 get_area = current->mm->get_unmapped_area; 220 221 if (flags & MAP_FIXED) { 222 /* Ok, don't mess with it. */ 223 return get_area(NULL, orig_addr, len, pgoff, flags); 224 } 225 flags &= ~MAP_SHARED; 226 227 align_goal = PAGE_SIZE; 228 if (len >= (4UL * 1024 * 1024)) 229 align_goal = (4UL * 1024 * 1024); 230 else if (len >= (512UL * 1024)) 231 align_goal = (512UL * 1024); 232 else if (len >= (64UL * 1024)) 233 align_goal = (64UL * 1024); 234 235 do { 236 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags); 237 if (!(addr & ~PAGE_MASK)) { 238 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL); 239 break; 240 } 241 242 if (align_goal == (4UL * 1024 * 1024)) 243 align_goal = (512UL * 1024); 244 else if (align_goal == (512UL * 1024)) 245 align_goal = (64UL * 1024); 246 else 247 align_goal = PAGE_SIZE; 248 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE); 249 250 /* Mapping is smaller than 64K or larger areas could not 251 * be obtained. 252 */ 253 if (addr & ~PAGE_MASK) 254 addr = get_area(NULL, orig_addr, len, pgoff, flags); 255 256 return addr; 257 } 258 EXPORT_SYMBOL(get_fb_unmapped_area); 259 260 /* Essentially the same as PowerPC. */ 261 static unsigned long mmap_rnd(void) 262 { 263 unsigned long rnd = 0UL; 264 265 if (current->flags & PF_RANDOMIZE) { 266 unsigned long val = get_random_int(); 267 if (test_thread_flag(TIF_32BIT)) 268 rnd = (val % (1UL << (23UL-PAGE_SHIFT))); 269 else 270 rnd = (val % (1UL << (30UL-PAGE_SHIFT))); 271 } 272 return rnd << PAGE_SHIFT; 273 } 274 275 void arch_pick_mmap_layout(struct mm_struct *mm) 276 { 277 unsigned long random_factor = mmap_rnd(); 278 unsigned long gap; 279 280 /* 281 * Fall back to the standard layout if the personality 282 * bit is set, or if the expected stack growth is unlimited: 283 */ 284 gap = rlimit(RLIMIT_STACK); 285 if (!test_thread_flag(TIF_32BIT) || 286 (current->personality & ADDR_COMPAT_LAYOUT) || 287 gap == RLIM_INFINITY || 288 sysctl_legacy_va_layout) { 289 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; 290 mm->get_unmapped_area = arch_get_unmapped_area; 291 } else { 292 /* We know it's 32-bit */ 293 unsigned long task_size = STACK_TOP32; 294 295 if (gap < 128 * 1024 * 1024) 296 gap = 128 * 1024 * 1024; 297 if (gap > (task_size / 6 * 5)) 298 gap = (task_size / 6 * 5); 299 300 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor); 301 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 302 } 303 } 304 305 /* 306 * sys_pipe() is the normal C calling standard for creating 307 * a pipe. It's not the way unix traditionally does this, though. 308 */ 309 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs) 310 { 311 int fd[2]; 312 int error; 313 314 error = do_pipe_flags(fd, 0); 315 if (error) 316 goto out; 317 regs->u_regs[UREG_I1] = fd[1]; 318 error = fd[0]; 319 out: 320 return error; 321 } 322 323 /* 324 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 325 * 326 * This is really horribly ugly. 327 */ 328 329 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second, 330 unsigned long, third, void __user *, ptr, long, fifth) 331 { 332 long err; 333 334 /* No need for backward compatibility. We can start fresh... */ 335 if (call <= SEMCTL) { 336 switch (call) { 337 case SEMOP: 338 err = sys_semtimedop(first, ptr, 339 (unsigned)second, NULL); 340 goto out; 341 case SEMTIMEDOP: 342 err = sys_semtimedop(first, ptr, (unsigned)second, 343 (const struct timespec __user *) 344 (unsigned long) fifth); 345 goto out; 346 case SEMGET: 347 err = sys_semget(first, (int)second, (int)third); 348 goto out; 349 case SEMCTL: { 350 err = sys_semctl(first, second, 351 (int)third | IPC_64, 352 (unsigned long) ptr); 353 goto out; 354 } 355 default: 356 err = -ENOSYS; 357 goto out; 358 } 359 } 360 if (call <= MSGCTL) { 361 switch (call) { 362 case MSGSND: 363 err = sys_msgsnd(first, ptr, (size_t)second, 364 (int)third); 365 goto out; 366 case MSGRCV: 367 err = sys_msgrcv(first, ptr, (size_t)second, fifth, 368 (int)third); 369 goto out; 370 case MSGGET: 371 err = sys_msgget((key_t)first, (int)second); 372 goto out; 373 case MSGCTL: 374 err = sys_msgctl(first, (int)second | IPC_64, ptr); 375 goto out; 376 default: 377 err = -ENOSYS; 378 goto out; 379 } 380 } 381 if (call <= SHMCTL) { 382 switch (call) { 383 case SHMAT: { 384 ulong raddr; 385 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA); 386 if (!err) { 387 if (put_user(raddr, 388 (ulong __user *) third)) 389 err = -EFAULT; 390 } 391 goto out; 392 } 393 case SHMDT: 394 err = sys_shmdt(ptr); 395 goto out; 396 case SHMGET: 397 err = sys_shmget(first, (size_t)second, (int)third); 398 goto out; 399 case SHMCTL: 400 err = sys_shmctl(first, (int)second | IPC_64, ptr); 401 goto out; 402 default: 403 err = -ENOSYS; 404 goto out; 405 } 406 } else { 407 err = -ENOSYS; 408 } 409 out: 410 return err; 411 } 412 413 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) 414 { 415 int ret; 416 417 if (personality(current->personality) == PER_LINUX32 && 418 personality(personality) == PER_LINUX) 419 personality |= PER_LINUX32; 420 ret = sys_personality(personality); 421 if (personality(ret) == PER_LINUX32) 422 ret &= ~PER_LINUX32; 423 424 return ret; 425 } 426 427 int sparc_mmap_check(unsigned long addr, unsigned long len) 428 { 429 if (test_thread_flag(TIF_32BIT)) { 430 if (len >= STACK_TOP32) 431 return -EINVAL; 432 433 if (addr > STACK_TOP32 - len) 434 return -EINVAL; 435 } else { 436 if (len >= VA_EXCLUDE_START) 437 return -EINVAL; 438 439 if (invalid_64bit_range(addr, len)) 440 return -EINVAL; 441 } 442 443 return 0; 444 } 445 446 /* Linux version of mmap */ 447 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, 448 unsigned long, prot, unsigned long, flags, unsigned long, fd, 449 unsigned long, off) 450 { 451 unsigned long retval = -EINVAL; 452 453 if ((off + PAGE_ALIGN(len)) < off) 454 goto out; 455 if (off & ~PAGE_MASK) 456 goto out; 457 retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 458 out: 459 return retval; 460 } 461 462 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len) 463 { 464 if (invalid_64bit_range(addr, len)) 465 return -EINVAL; 466 467 return vm_munmap(addr, len); 468 } 469 470 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len, 471 unsigned long, new_len, unsigned long, flags, 472 unsigned long, new_addr) 473 { 474 if (test_thread_flag(TIF_32BIT)) 475 return -EINVAL; 476 return sys_mremap(addr, old_len, new_len, flags, new_addr); 477 } 478 479 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 480 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs) 481 { 482 static int count; 483 484 /* Don't make the system unusable, if someone goes stuck */ 485 if (count++ > 5) 486 return -ENOSYS; 487 488 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]); 489 #ifdef DEBUG_UNIMP_SYSCALL 490 show_regs (regs); 491 #endif 492 493 return -ENOSYS; 494 } 495 496 /* #define DEBUG_SPARC_BREAKPOINT */ 497 498 asmlinkage void sparc_breakpoint(struct pt_regs *regs) 499 { 500 enum ctx_state prev_state = exception_enter(); 501 siginfo_t info; 502 503 if (test_thread_flag(TIF_32BIT)) { 504 regs->tpc &= 0xffffffff; 505 regs->tnpc &= 0xffffffff; 506 } 507 #ifdef DEBUG_SPARC_BREAKPOINT 508 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc); 509 #endif 510 info.si_signo = SIGTRAP; 511 info.si_errno = 0; 512 info.si_code = TRAP_BRKPT; 513 info.si_addr = (void __user *)regs->tpc; 514 info.si_trapno = 0; 515 force_sig_info(SIGTRAP, &info, current); 516 #ifdef DEBUG_SPARC_BREAKPOINT 517 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc); 518 #endif 519 exception_exit(prev_state); 520 } 521 522 extern void check_pending(int signum); 523 524 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) 525 { 526 int nlen, err; 527 528 if (len < 0) 529 return -EINVAL; 530 531 down_read(&uts_sem); 532 533 nlen = strlen(utsname()->domainname) + 1; 534 err = -EINVAL; 535 if (nlen > len) 536 goto out; 537 538 err = -EFAULT; 539 if (!copy_to_user(name, utsname()->domainname, nlen)) 540 err = 0; 541 542 out: 543 up_read(&uts_sem); 544 return err; 545 } 546 547 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type, 548 utrap_handler_t, new_p, utrap_handler_t, new_d, 549 utrap_handler_t __user *, old_p, 550 utrap_handler_t __user *, old_d) 551 { 552 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31) 553 return -EINVAL; 554 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) { 555 if (old_p) { 556 if (!current_thread_info()->utraps) { 557 if (put_user(NULL, old_p)) 558 return -EFAULT; 559 } else { 560 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) 561 return -EFAULT; 562 } 563 } 564 if (old_d) { 565 if (put_user(NULL, old_d)) 566 return -EFAULT; 567 } 568 return 0; 569 } 570 if (!current_thread_info()->utraps) { 571 current_thread_info()->utraps = 572 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL); 573 if (!current_thread_info()->utraps) 574 return -ENOMEM; 575 current_thread_info()->utraps[0] = 1; 576 } else { 577 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p && 578 current_thread_info()->utraps[0] > 1) { 579 unsigned long *p = current_thread_info()->utraps; 580 581 current_thread_info()->utraps = 582 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), 583 GFP_KERNEL); 584 if (!current_thread_info()->utraps) { 585 current_thread_info()->utraps = p; 586 return -ENOMEM; 587 } 588 p[0]--; 589 current_thread_info()->utraps[0] = 1; 590 memcpy(current_thread_info()->utraps+1, p+1, 591 UT_TRAP_INSTRUCTION_31*sizeof(long)); 592 } 593 } 594 if (old_p) { 595 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) 596 return -EFAULT; 597 } 598 if (old_d) { 599 if (put_user(NULL, old_d)) 600 return -EFAULT; 601 } 602 current_thread_info()->utraps[type] = (long)new_p; 603 604 return 0; 605 } 606 607 asmlinkage long sparc_memory_ordering(unsigned long model, 608 struct pt_regs *regs) 609 { 610 if (model >= 3) 611 return -EINVAL; 612 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14); 613 return 0; 614 } 615 616 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act, 617 struct sigaction __user *, oact, void __user *, restorer, 618 size_t, sigsetsize) 619 { 620 struct k_sigaction new_ka, old_ka; 621 int ret; 622 623 /* XXX: Don't preclude handling different sized sigset_t's. */ 624 if (sigsetsize != sizeof(sigset_t)) 625 return -EINVAL; 626 627 if (act) { 628 new_ka.ka_restorer = restorer; 629 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 630 return -EFAULT; 631 } 632 633 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 634 635 if (!ret && oact) { 636 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 637 return -EFAULT; 638 } 639 640 return ret; 641 } 642 643 asmlinkage long sys_kern_features(void) 644 { 645 return KERN_FEATURE_MIXED_MODE_STACK; 646 } 647