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 28 #include <asm/uaccess.h> 29 #include <asm/utrap.h> 30 #include <asm/unistd.h> 31 32 #include "entry.h" 33 #include "systbls.h" 34 35 /* #define DEBUG_UNIMP_SYSCALL */ 36 37 asmlinkage unsigned long sys_getpagesize(void) 38 { 39 return PAGE_SIZE; 40 } 41 42 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL)) 43 #define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL)) 44 45 /* Does addr --> addr+len fall within 4GB of the VA-space hole or 46 * overflow past the end of the 64-bit address space? 47 */ 48 static inline int invalid_64bit_range(unsigned long addr, unsigned long len) 49 { 50 unsigned long va_exclude_start, va_exclude_end; 51 52 va_exclude_start = VA_EXCLUDE_START; 53 va_exclude_end = VA_EXCLUDE_END; 54 55 if (unlikely(len >= va_exclude_start)) 56 return 1; 57 58 if (unlikely((addr + len) < addr)) 59 return 1; 60 61 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) || 62 ((addr + len) >= va_exclude_start && 63 (addr + len) < va_exclude_end))) 64 return 1; 65 66 return 0; 67 } 68 69 /* These functions differ from the default implementations in 70 * mm/mmap.c in two ways: 71 * 72 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align, 73 * for fixed such mappings we just validate what the user gave us. 74 * 2) For 64-bit tasks we avoid mapping anything within 4GB of 75 * the spitfire/niagara VA-hole. 76 */ 77 78 static inline unsigned long COLOR_ALIGN(unsigned long addr, 79 unsigned long pgoff) 80 { 81 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1); 82 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1); 83 84 return base + off; 85 } 86 87 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 88 { 89 struct mm_struct *mm = current->mm; 90 struct vm_area_struct * vma; 91 unsigned long task_size = TASK_SIZE; 92 int do_color_align; 93 struct vm_unmapped_area_info info; 94 95 if (flags & MAP_FIXED) { 96 /* We do not accept a shared mapping if it would violate 97 * cache aliasing constraints. 98 */ 99 if ((flags & MAP_SHARED) && 100 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 101 return -EINVAL; 102 return addr; 103 } 104 105 if (test_thread_flag(TIF_32BIT)) 106 task_size = STACK_TOP32; 107 if (unlikely(len > task_size || len >= VA_EXCLUDE_START)) 108 return -ENOMEM; 109 110 do_color_align = 0; 111 if (filp || (flags & MAP_SHARED)) 112 do_color_align = 1; 113 114 if (addr) { 115 if (do_color_align) 116 addr = COLOR_ALIGN(addr, pgoff); 117 else 118 addr = PAGE_ALIGN(addr); 119 120 vma = find_vma(mm, addr); 121 if (task_size - len >= addr && 122 (!vma || addr + len <= vma->vm_start)) 123 return addr; 124 } 125 126 info.flags = 0; 127 info.length = len; 128 info.low_limit = TASK_UNMAPPED_BASE; 129 info.high_limit = min(task_size, VA_EXCLUDE_START); 130 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; 131 info.align_offset = pgoff << PAGE_SHIFT; 132 addr = vm_unmapped_area(&info); 133 134 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) { 135 VM_BUG_ON(addr != -ENOMEM); 136 info.low_limit = VA_EXCLUDE_END; 137 info.high_limit = task_size; 138 addr = vm_unmapped_area(&info); 139 } 140 141 return addr; 142 } 143 144 unsigned long 145 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 146 const unsigned long len, const unsigned long pgoff, 147 const unsigned long flags) 148 { 149 struct vm_area_struct *vma; 150 struct mm_struct *mm = current->mm; 151 unsigned long task_size = STACK_TOP32; 152 unsigned long addr = addr0; 153 int do_color_align; 154 struct vm_unmapped_area_info info; 155 156 /* This should only ever run for 32-bit processes. */ 157 BUG_ON(!test_thread_flag(TIF_32BIT)); 158 159 if (flags & MAP_FIXED) { 160 /* We do not accept a shared mapping if it would violate 161 * cache aliasing constraints. 162 */ 163 if ((flags & MAP_SHARED) && 164 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 165 return -EINVAL; 166 return addr; 167 } 168 169 if (unlikely(len > task_size)) 170 return -ENOMEM; 171 172 do_color_align = 0; 173 if (filp || (flags & MAP_SHARED)) 174 do_color_align = 1; 175 176 /* requesting a specific address */ 177 if (addr) { 178 if (do_color_align) 179 addr = COLOR_ALIGN(addr, pgoff); 180 else 181 addr = PAGE_ALIGN(addr); 182 183 vma = find_vma(mm, addr); 184 if (task_size - len >= addr && 185 (!vma || addr + len <= vma->vm_start)) 186 return addr; 187 } 188 189 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 190 info.length = len; 191 info.low_limit = PAGE_SIZE; 192 info.high_limit = mm->mmap_base; 193 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; 194 info.align_offset = pgoff << PAGE_SHIFT; 195 addr = vm_unmapped_area(&info); 196 197 /* 198 * A failed mmap() very likely causes application failure, 199 * so fall back to the bottom-up function here. This scenario 200 * can happen with large stack limits and large mmap() 201 * allocations. 202 */ 203 if (addr & ~PAGE_MASK) { 204 VM_BUG_ON(addr != -ENOMEM); 205 info.flags = 0; 206 info.low_limit = TASK_UNMAPPED_BASE; 207 info.high_limit = STACK_TOP32; 208 addr = vm_unmapped_area(&info); 209 } 210 211 return addr; 212 } 213 214 /* Try to align mapping such that we align it as much as possible. */ 215 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags) 216 { 217 unsigned long align_goal, addr = -ENOMEM; 218 unsigned long (*get_area)(struct file *, unsigned long, 219 unsigned long, unsigned long, unsigned long); 220 221 get_area = current->mm->get_unmapped_area; 222 223 if (flags & MAP_FIXED) { 224 /* Ok, don't mess with it. */ 225 return get_area(NULL, orig_addr, len, pgoff, flags); 226 } 227 flags &= ~MAP_SHARED; 228 229 align_goal = PAGE_SIZE; 230 if (len >= (4UL * 1024 * 1024)) 231 align_goal = (4UL * 1024 * 1024); 232 else if (len >= (512UL * 1024)) 233 align_goal = (512UL * 1024); 234 else if (len >= (64UL * 1024)) 235 align_goal = (64UL * 1024); 236 237 do { 238 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags); 239 if (!(addr & ~PAGE_MASK)) { 240 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL); 241 break; 242 } 243 244 if (align_goal == (4UL * 1024 * 1024)) 245 align_goal = (512UL * 1024); 246 else if (align_goal == (512UL * 1024)) 247 align_goal = (64UL * 1024); 248 else 249 align_goal = PAGE_SIZE; 250 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE); 251 252 /* Mapping is smaller than 64K or larger areas could not 253 * be obtained. 254 */ 255 if (addr & ~PAGE_MASK) 256 addr = get_area(NULL, orig_addr, len, pgoff, flags); 257 258 return addr; 259 } 260 EXPORT_SYMBOL(get_fb_unmapped_area); 261 262 /* Essentially the same as PowerPC. */ 263 static unsigned long mmap_rnd(void) 264 { 265 unsigned long rnd = 0UL; 266 267 if (current->flags & PF_RANDOMIZE) { 268 unsigned long val = get_random_int(); 269 if (test_thread_flag(TIF_32BIT)) 270 rnd = (val % (1UL << (23UL-PAGE_SHIFT))); 271 else 272 rnd = (val % (1UL << (30UL-PAGE_SHIFT))); 273 } 274 return rnd << PAGE_SHIFT; 275 } 276 277 void arch_pick_mmap_layout(struct mm_struct *mm) 278 { 279 unsigned long random_factor = mmap_rnd(); 280 unsigned long gap; 281 282 /* 283 * Fall back to the standard layout if the personality 284 * bit is set, or if the expected stack growth is unlimited: 285 */ 286 gap = rlimit(RLIMIT_STACK); 287 if (!test_thread_flag(TIF_32BIT) || 288 (current->personality & ADDR_COMPAT_LAYOUT) || 289 gap == RLIM_INFINITY || 290 sysctl_legacy_va_layout) { 291 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; 292 mm->get_unmapped_area = arch_get_unmapped_area; 293 } else { 294 /* We know it's 32-bit */ 295 unsigned long task_size = STACK_TOP32; 296 297 if (gap < 128 * 1024 * 1024) 298 gap = 128 * 1024 * 1024; 299 if (gap > (task_size / 6 * 5)) 300 gap = (task_size / 6 * 5); 301 302 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor); 303 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 304 } 305 } 306 307 /* 308 * sys_pipe() is the normal C calling standard for creating 309 * a pipe. It's not the way unix traditionally does this, though. 310 */ 311 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs) 312 { 313 int fd[2]; 314 int error; 315 316 error = do_pipe_flags(fd, 0); 317 if (error) 318 goto out; 319 regs->u_regs[UREG_I1] = fd[1]; 320 error = fd[0]; 321 out: 322 return error; 323 } 324 325 /* 326 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 327 * 328 * This is really horribly ugly. 329 */ 330 331 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second, 332 unsigned long, third, void __user *, ptr, long, fifth) 333 { 334 long err; 335 336 /* No need for backward compatibility. We can start fresh... */ 337 if (call <= SEMCTL) { 338 switch (call) { 339 case SEMOP: 340 err = sys_semtimedop(first, ptr, 341 (unsigned)second, NULL); 342 goto out; 343 case SEMTIMEDOP: 344 err = sys_semtimedop(first, ptr, (unsigned)second, 345 (const struct timespec __user *) 346 (unsigned long) fifth); 347 goto out; 348 case SEMGET: 349 err = sys_semget(first, (int)second, (int)third); 350 goto out; 351 case SEMCTL: { 352 err = sys_semctl(first, second, 353 (int)third | IPC_64, 354 (unsigned long) ptr); 355 goto out; 356 } 357 default: 358 err = -ENOSYS; 359 goto out; 360 } 361 } 362 if (call <= MSGCTL) { 363 switch (call) { 364 case MSGSND: 365 err = sys_msgsnd(first, ptr, (size_t)second, 366 (int)third); 367 goto out; 368 case MSGRCV: 369 err = sys_msgrcv(first, ptr, (size_t)second, fifth, 370 (int)third); 371 goto out; 372 case MSGGET: 373 err = sys_msgget((key_t)first, (int)second); 374 goto out; 375 case MSGCTL: 376 err = sys_msgctl(first, (int)second | IPC_64, ptr); 377 goto out; 378 default: 379 err = -ENOSYS; 380 goto out; 381 } 382 } 383 if (call <= SHMCTL) { 384 switch (call) { 385 case SHMAT: { 386 ulong raddr; 387 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA); 388 if (!err) { 389 if (put_user(raddr, 390 (ulong __user *) third)) 391 err = -EFAULT; 392 } 393 goto out; 394 } 395 case SHMDT: 396 err = sys_shmdt(ptr); 397 goto out; 398 case SHMGET: 399 err = sys_shmget(first, (size_t)second, (int)third); 400 goto out; 401 case SHMCTL: 402 err = sys_shmctl(first, (int)second | IPC_64, ptr); 403 goto out; 404 default: 405 err = -ENOSYS; 406 goto out; 407 } 408 } else { 409 err = -ENOSYS; 410 } 411 out: 412 return err; 413 } 414 415 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) 416 { 417 int ret; 418 419 if (personality(current->personality) == PER_LINUX32 && 420 personality(personality) == PER_LINUX) 421 personality |= PER_LINUX32; 422 ret = sys_personality(personality); 423 if (personality(ret) == PER_LINUX32) 424 ret &= ~PER_LINUX32; 425 426 return ret; 427 } 428 429 int sparc_mmap_check(unsigned long addr, unsigned long len) 430 { 431 if (test_thread_flag(TIF_32BIT)) { 432 if (len >= STACK_TOP32) 433 return -EINVAL; 434 435 if (addr > STACK_TOP32 - len) 436 return -EINVAL; 437 } else { 438 if (len >= VA_EXCLUDE_START) 439 return -EINVAL; 440 441 if (invalid_64bit_range(addr, len)) 442 return -EINVAL; 443 } 444 445 return 0; 446 } 447 448 /* Linux version of mmap */ 449 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, 450 unsigned long, prot, unsigned long, flags, unsigned long, fd, 451 unsigned long, off) 452 { 453 unsigned long retval = -EINVAL; 454 455 if ((off + PAGE_ALIGN(len)) < off) 456 goto out; 457 if (off & ~PAGE_MASK) 458 goto out; 459 retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 460 out: 461 return retval; 462 } 463 464 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len) 465 { 466 if (invalid_64bit_range(addr, len)) 467 return -EINVAL; 468 469 return vm_munmap(addr, len); 470 } 471 472 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len, 473 unsigned long, new_len, unsigned long, flags, 474 unsigned long, new_addr) 475 { 476 if (test_thread_flag(TIF_32BIT)) 477 return -EINVAL; 478 return sys_mremap(addr, old_len, new_len, flags, new_addr); 479 } 480 481 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 482 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs) 483 { 484 static int count; 485 486 /* Don't make the system unusable, if someone goes stuck */ 487 if (count++ > 5) 488 return -ENOSYS; 489 490 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]); 491 #ifdef DEBUG_UNIMP_SYSCALL 492 show_regs (regs); 493 #endif 494 495 return -ENOSYS; 496 } 497 498 /* #define DEBUG_SPARC_BREAKPOINT */ 499 500 asmlinkage void sparc_breakpoint(struct pt_regs *regs) 501 { 502 siginfo_t info; 503 504 if (test_thread_flag(TIF_32BIT)) { 505 regs->tpc &= 0xffffffff; 506 regs->tnpc &= 0xffffffff; 507 } 508 #ifdef DEBUG_SPARC_BREAKPOINT 509 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc); 510 #endif 511 info.si_signo = SIGTRAP; 512 info.si_errno = 0; 513 info.si_code = TRAP_BRKPT; 514 info.si_addr = (void __user *)regs->tpc; 515 info.si_trapno = 0; 516 force_sig_info(SIGTRAP, &info, current); 517 #ifdef DEBUG_SPARC_BREAKPOINT 518 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc); 519 #endif 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