arch/sparc64/kernel/sys_sparc.c

   1 /* $Id: sys_sparc.c,v 1.47 2000/11/29 05:56:12 anton Exp $
   2  * linux/arch/sparc64/kernel/sys_sparc.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/sparc
   6  * platform.
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/errno.h>
  11 #include <linux/types.h>
  12 #include <linux/sched.h>
  13 #include <linux/fs.h>
  14 #include <linux/file.h>
  15 #include <linux/mm.h>
  16 #include <linux/sem.h>
  17 #include <linux/msg.h>
  18 #include <linux/shm.h>
  19 #include <linux/stat.h>
  20 #include <linux/mman.h>
  21 #include <linux/utsname.h>
  22 #include <linux/smp.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/malloc.h>
  25 #include <linux/ipc.h>
  26 #include <linux/personality.h>
  27
  28 #include <asm/uaccess.h>
  29 #include <asm/ipc.h>
  30 #include <asm/utrap.h>
  31 #include <asm/perfctr.h>
  32
  33 /* #define DEBUG_UNIMP_SYSCALL */
  34
  35 /* XXX Make this per-binary type, this way we can detect the type of
  36  * XXX a binary.  Every Sparc executable calls this very early on.
  37  */
  38 asmlinkage unsigned long sys_getpagesize(void)
  39 {
  40         return PAGE_SIZE;
  41 }
  42
  43 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  44
  45 unsigned long get_unmapped_area(unsigned long addr, unsigned long len)
  46 {
  47         struct vm_area_struct * vmm;
  48         unsigned long task_size = TASK_SIZE;
  49
  50         if (current->thread.flags & SPARC_FLAG_32BIT)
  51                 task_size = 0xf0000000UL;
  52         if (len > task_size || len > -PAGE_OFFSET)
  53                 return 0;
  54         if (!addr)
  55                 addr = TASK_UNMAPPED_BASE;
  56
  57         if (current->thread.flags & SPARC_FLAG_MMAPSHARED)
  58                 addr = COLOUR_ALIGN(addr);
  59         else
  60                 addr = PAGE_ALIGN(addr);
  61
  62         task_size -= len;
  63
  64         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  65                 /* At this point:  (!vmm || addr < vmm->vm_end). */
  66                 if (addr < PAGE_OFFSET && -PAGE_OFFSET - len < addr) {
  67                         addr = PAGE_OFFSET;
  68                         vmm = find_vma(current->mm, PAGE_OFFSET);
  69                 }
  70                 if (task_size < addr)
  71                         return 0;
  72                 if (!vmm || addr + len <= vmm->vm_start)
  73                         return addr;
  74                 addr = vmm->vm_end;
  75                 if (current->thread.flags & SPARC_FLAG_MMAPSHARED)
  76                         addr = COLOUR_ALIGN(addr);
  77         }
  78 }
  79
  80 extern asmlinkage unsigned long sys_brk(unsigned long brk);
  81
  82 asmlinkage unsigned long sparc_brk(unsigned long brk)
  83 {
  84         /* People could try to be nasty and use ta 0x6d in 32bit programs */
  85         if ((current->thread.flags & SPARC_FLAG_32BIT) &&
  86             brk >= 0xf0000000UL)
  87                 return current->mm->brk;
  88
  89         if ((current->mm->brk & PAGE_OFFSET) != (brk & PAGE_OFFSET))
  90                 return current->mm->brk;
  91         return sys_brk(brk);
  92 }
  93
  94 /*
  95  * sys_pipe() is the normal C calling standard for creating
  96  * a pipe. It's not the way unix traditionally does this, though.
  97  */
  98 asmlinkage int sparc_pipe(struct pt_regs *regs)
  99 {
 100         int fd[2];
 101         int error;
 102
 103         error = do_pipe(fd);
 104         if (error)
 105                 goto out;
 106         regs->u_regs[UREG_I1] = fd[1];
 107         error = fd[0];
 108 out:
 109         return error;
 110 }
 111
 112 /*
 113  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 114  *
 115  * This is really horribly ugly.
 116  */
 117
 118 asmlinkage int sys_ipc (unsigned call, int first, int second, unsigned long third, void *ptr, long fifth)
 119 {
 120         int err;
 121
 122         /* No need for backward compatibility. We can start fresh... */
 123
 124         if (call <= SEMCTL)
 125                 switch (call) {
 126                 case SEMOP:
 127                         err = sys_semop (first, (struct sembuf *)ptr, second);
 128                         goto out;
 129                 case SEMGET:
 130                         err = sys_semget (first, second, (int)third);
 131                         goto out;
 132                 case SEMCTL: {
 133                         union semun fourth;
 134                         err = -EINVAL;
 135                         if (!ptr)
 136                                 goto out;
 137                         err = -EFAULT;
 138                         if(get_user(fourth.__pad, (void **)ptr))
 139                                 goto out;
 140                         err = sys_semctl (first, second | IPC_64, (int)third, fourth);
 141                         goto out;
 142                         }
 143                 default:
 144                         err = -EINVAL;
 145                         goto out;
 146                 }
 147         if (call <= MSGCTL)
 148                 switch (call) {
 149                 case MSGSND:
 150                         err = sys_msgsnd (first, (struct msgbuf *) ptr,
 151                                           second, (int)third);
 152                         goto out;
 153                 case MSGRCV:
 154                         err = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, (int)third);
 155                         goto out;
 156                 case MSGGET:
 157                         err = sys_msgget ((key_t) first, second);
 158                         goto out;
 159                 case MSGCTL:
 160                         err = sys_msgctl (first, second | IPC_64, (struct msqid_ds *) ptr);
 161                         goto out;
 162                 default:
 163                         err = -EINVAL;
 164                         goto out;
 165                 }
 166         if (call <= SHMCTL)
 167                 switch (call) {
 168                 case SHMAT:
 169                         err = sys_shmat (first, (char *) ptr, second, (ulong *) third);
 170                         goto out;
 171                 case SHMDT:
 172                         err = sys_shmdt ((char *)ptr);
 173                         goto out;
 174                 case SHMGET:
 175                         err = sys_shmget (first, second, (int)third);
 176                         goto out;
 177                 case SHMCTL:
 178                         err = sys_shmctl (first, second | IPC_64, (struct shmid_ds *) ptr);
 179                         goto out;
 180                 default:
 181                         err = -EINVAL;
 182                         goto out;
 183                 }
 184         else
 185                 err = -EINVAL;
 186 out:
 187         return err;
 188 }
 189
 190 extern asmlinkage int sys_newuname(struct new_utsname * name);
 191
 192 asmlinkage int sparc64_newuname(struct new_utsname * name)
 193 {
 194         int ret = sys_newuname(name);
 195
 196         if (current->personality == PER_LINUX32 && !ret) {
 197                 ret = copy_to_user(name->machine, "sparc\0\0", 8);
 198         }
 199         return ret;
 200 }
 201
 202 extern asmlinkage long sys_personality(unsigned long);
 203
 204 asmlinkage int sparc64_personality(unsigned long personality)
 205 {
 206         int ret;
 207         if (current->personality == PER_LINUX32 && personality == PER_LINUX)
 208                 personality = PER_LINUX32;
 209         ret = sys_personality(personality);
 210         if (ret == PER_LINUX32)
 211                 ret = PER_LINUX;
 212         return ret;
 213 }
 214
 215 /* Linux version of mmap */
 216 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 217         unsigned long prot, unsigned long flags, unsigned long fd,
 218         unsigned long off)
 219 {
 220         struct file * file = NULL;
 221         unsigned long retval = -EBADF;
 222
 223         if (!(flags & MAP_ANONYMOUS)) {
 224                 file = fget(fd);
 225                 if (!file)
 226                         goto out;
 227         }
 228         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 229         len = PAGE_ALIGN(len);
 230         retval = -EINVAL;
 231
 232         if (current->thread.flags & SPARC_FLAG_32BIT) {
 233                 if (len > 0xf0000000UL ||
 234                     ((flags & MAP_FIXED) && addr > 0xf0000000UL - len))
 235                         goto out_putf;
 236         } else {
 237                 if (len > -PAGE_OFFSET ||
 238                     ((flags & MAP_FIXED) &&
 239                      addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
 240                         goto out_putf;
 241         }
 242
 243         if (flags & MAP_SHARED)
 244                 current->thread.flags |= SPARC_FLAG_MMAPSHARED;
 245
 246         down(&current->mm->mmap_sem);
 247         retval = do_mmap(file, addr, len, prot, flags, off);
 248         up(&current->mm->mmap_sem);
 249
 250         current->thread.flags &= ~(SPARC_FLAG_MMAPSHARED);
 251
 252 out_putf:
 253         if (file)
 254                 fput(file);
 255 out:
 256         return retval;
 257 }
 258
 259 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 260 {
 261         long ret;
 262
 263         if (len > -PAGE_OFFSET ||
 264             (addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
 265                 return -EINVAL;
 266         down(&current->mm->mmap_sem);
 267         ret = do_munmap(current->mm, addr, len);
 268         up(&current->mm->mmap_sem);
 269         return ret;
 270 }
 271
 272 extern unsigned long do_mremap(unsigned long addr,
 273         unsigned long old_len, unsigned long new_len,
 274         unsigned long flags, unsigned long new_addr);
 275
 276 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 277         unsigned long old_len, unsigned long new_len,
 278         unsigned long flags, unsigned long new_addr)
 279 {
 280         struct vm_area_struct *vma;
 281         unsigned long ret = -EINVAL;
 282         if (current->thread.flags & SPARC_FLAG_32BIT)
 283                 goto out;
 284         if (old_len > -PAGE_OFFSET || new_len > -PAGE_OFFSET)
 285                 goto out;
 286         if (addr < PAGE_OFFSET && addr + old_len > -PAGE_OFFSET)
 287                 goto out;
 288         down(&current->mm->mmap_sem);
 289         vma = find_vma(current->mm, addr);
 290         if (vma && (vma->vm_flags & VM_SHARED))
 291                 current->thread.flags |= SPARC_FLAG_MMAPSHARED;
 292         if (flags & MREMAP_FIXED) {
 293                 if (new_addr < PAGE_OFFSET &&
 294                     new_addr + new_len > -PAGE_OFFSET)
 295                         goto out_sem;
 296         } else if (addr < PAGE_OFFSET && addr + new_len > -PAGE_OFFSET) {
 297                 ret = -ENOMEM;
 298                 if (!(flags & MREMAP_MAYMOVE))
 299                         goto out_sem;
 300                 new_addr = get_unmapped_area(addr, new_len);
 301                 if (!new_addr)
 302                         goto out_sem;
 303                 flags |= MREMAP_FIXED;
 304         }
 305         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 306 out_sem:
 307         current->thread.flags &= ~(SPARC_FLAG_MMAPSHARED);
 308         up(&current->mm->mmap_sem);
 309 out:
 310         return ret;
 311 }
 312
 313 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 314 asmlinkage unsigned long
 315 c_sys_nis_syscall (struct pt_regs *regs)
 316 {
 317         static int count=0;
 318
 319         /* Don't make the system unusable, if someone goes stuck */
 320         if (count++ > 5)
 321                 return -ENOSYS;
 322
 323         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 324 #ifdef DEBUG_UNIMP_SYSCALL
 325         show_regs (regs);
 326 #endif
 327
 328         return -ENOSYS;
 329 }
 330
 331 /* #define DEBUG_SPARC_BREAKPOINT */
 332
 333 asmlinkage void
 334 sparc_breakpoint (struct pt_regs *regs)
 335 {
 336         siginfo_t info;
 337
 338 #ifdef DEBUG_SPARC_BREAKPOINT
 339         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 340 #endif
 341         info.si_signo = SIGTRAP;
 342         info.si_errno = 0;
 343         info.si_code = TRAP_BRKPT;
 344         info.si_addr = (void *)regs->tpc;
 345         info.si_trapno = 0;
 346         force_sig_info(SIGTRAP, &info, current);
 347 #ifdef DEBUG_SPARC_BREAKPOINT
 348         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 349 #endif
 350 }
 351
 352 extern void check_pending(int signum);
 353
 354 asmlinkage int sys_getdomainname(char *name, int len)
 355 {
 356         int nlen;
 357         int err = -EFAULT;
 358
 359         down_read(&uts_sem);
 360
 361         nlen = strlen(system_utsname.domainname) + 1;
 362
 363         if (nlen < len)
 364                 len = nlen;
 365         if(len > __NEW_UTS_LEN)
 366                 goto done;
 367         if(copy_to_user(name, system_utsname.domainname, len))
 368                 goto done;
 369         err = 0;
 370 done:
 371         up_read(&uts_sem);
 372         return err;
 373 }
 374
 375 /* only AP+ systems have sys_aplib */
 376 asmlinkage int sys_aplib(void)
 377 {
 378         return -ENOSYS;
 379 }
 380
 381 asmlinkage int solaris_syscall(struct pt_regs *regs)
 382 {
 383         static int count = 0;
 384
 385         regs->tpc = regs->tnpc;
 386         regs->tnpc += 4;
 387         if(++count <= 5) {
 388                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 389                 show_regs (regs);
 390         }
 391         send_sig(SIGSEGV, current, 1);
 392
 393         return -ENOSYS;
 394 }
 395
 396 #ifndef CONFIG_SUNOS_EMUL
 397 asmlinkage int sunos_syscall(struct pt_regs *regs)
 398 {
 399         static int count = 0;
 400
 401         regs->tpc = regs->tnpc;
 402         regs->tnpc += 4;
 403         if(++count <= 20)
 404                 printk ("SunOS binary emulation not compiled in\n");
 405         force_sig(SIGSEGV, current);
 406
 407         return -ENOSYS;
 408 }
 409 #endif
 410
 411 asmlinkage int sys_utrap_install(utrap_entry_t type, utrap_handler_t new_p,
 412                                  utrap_handler_t new_d,
 413                                  utrap_handler_t *old_p, utrap_handler_t *old_d)
 414 {
 415         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 416                 return -EINVAL;
 417         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 418                 if (old_p) {
 419                         if (!current->thread.utraps) {
 420                                 if (put_user(NULL, old_p))
 421                                         return -EFAULT;
 422                         } else {
 423                                 if (put_user((utrap_handler_t)(current->thread.utraps[type]), old_p))
 424                                         return -EFAULT;
 425                         }
 426                 }
 427                 if (old_d) {
 428                         if (put_user(NULL, old_d))
 429                                 return -EFAULT;
 430                 }
 431                 return 0;
 432         }
 433         if (!current->thread.utraps) {
 434                 current->thread.utraps =
 435                         kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 436                 if (!current->thread.utraps) return -ENOMEM;
 437                 current->thread.utraps[0] = 1;
 438                 memset(current->thread.utraps+1, 0, UT_TRAP_INSTRUCTION_31*sizeof(long));
 439         } else {
 440                 if ((utrap_handler_t)current->thread.utraps[type] != new_p &&
 441                     current->thread.utraps[0] > 1) {
 442                         long *p = current->thread.utraps;
 443
 444                         current->thread.utraps =
 445                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 446                                         GFP_KERNEL);
 447                         if (!current->thread.utraps) {
 448                                 current->thread.utraps = p;
 449                                 return -ENOMEM;
 450                         }
 451                         p[0]--;
 452                         current->thread.utraps[0] = 1;
 453                         memcpy(current->thread.utraps+1, p+1,
 454                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 455                 }
 456         }
 457         if (old_p) {
 458                 if (put_user((utrap_handler_t)(current->thread.utraps[type]), old_p))
 459                         return -EFAULT;
 460         }
 461         if (old_d) {
 462                 if (put_user(NULL, old_d))
 463                         return -EFAULT;
 464         }
 465         current->thread.utraps[type] = (long)new_p;
 466
 467         return 0;
 468 }
 469
 470 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 471 {
 472         if (model >= 3)
 473                 return -EINVAL;
 474         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 475         return 0;
 476 }
 477
 478 asmlinkage int
 479 sys_rt_sigaction(int sig, const struct sigaction *act, struct sigaction *oact,
 480                  void *restorer, size_t sigsetsize)
 481 {
 482         struct k_sigaction new_ka, old_ka;
 483         int ret;
 484
 485         /* XXX: Don't preclude handling different sized sigset_t's.  */
 486         if (sigsetsize != sizeof(sigset_t))
 487                 return -EINVAL;
 488
 489         if (act) {
 490                 new_ka.ka_restorer = restorer;
 491                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 492                         return -EFAULT;
 493         }
 494
 495         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 496
 497         if (!ret && oact) {
 498                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 499                         return -EFAULT;
 500         }
 501
 502         return ret;
 503 }
 504
 505 /* Invoked by rtrap code to update performance counters in
 506  * user space.
 507  */
 508 asmlinkage void
 509 update_perfctrs(void)
 510 {
 511         unsigned long pic, tmp;
 512
 513         read_pic(pic);
 514         tmp = (current->thread.kernel_cntd0 += (unsigned int)pic);
 515         __put_user(tmp, current->thread.user_cntd0);
 516         tmp = (current->thread.kernel_cntd1 += (pic >> 32));
 517         __put_user(tmp, current->thread.user_cntd1);
 518         reset_pic();
 519 }
 520
 521 asmlinkage int
 522 sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 523 {
 524         int err = 0;
 525
 526         switch(opcode) {
 527         case PERFCTR_ON:
 528                 current->thread.pcr_reg = arg2;
 529                 current->thread.user_cntd0 = (u64 *) arg0;
 530                 current->thread.user_cntd1 = (u64 *) arg1;
 531                 current->thread.kernel_cntd0 =
 532                         current->thread.kernel_cntd1 = 0;
 533                 write_pcr(arg2);
 534                 reset_pic();
 535                 current->thread.flags |= SPARC_FLAG_PERFCTR;
 536                 break;
 537
 538         case PERFCTR_OFF:
 539                 err = -EINVAL;
 540                 if ((current->thread.flags & SPARC_FLAG_PERFCTR) != 0) {
 541                         current->thread.user_cntd0 =
 542                                 current->thread.user_cntd1 = NULL;
 543                         current->thread.pcr_reg = 0;
 544                         write_pcr(0);
 545                         current->thread.flags &= ~(SPARC_FLAG_PERFCTR);
 546                         err = 0;
 547                 }
 548                 break;
 549
 550         case PERFCTR_READ: {
 551                 unsigned long pic, tmp;
 552
 553                 if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
 554                         err = -EINVAL;
 555                         break;
 556                 }
 557                 read_pic(pic);
 558                 tmp = (current->thread.kernel_cntd0 += (unsigned int)pic);
 559                 err |= __put_user(tmp, current->thread.user_cntd0);
 560                 tmp = (current->thread.kernel_cntd1 += (pic >> 32));
 561                 err |= __put_user(tmp, current->thread.user_cntd1);
 562                 reset_pic();
 563                 break;
 564         }
 565
 566         case PERFCTR_CLRPIC:
 567                 if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
 568                         err = -EINVAL;
 569                         break;
 570                 }
 571                 current->thread.kernel_cntd0 =
 572                         current->thread.kernel_cntd1 = 0;
 573                 reset_pic();
 574                 break;
 575
 576         case PERFCTR_SETPCR: {
 577                 u64 *user_pcr = (u64 *)arg0;
 578                 if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
 579                         err = -EINVAL;
 580                         break;
 581                 }
 582                 err |= __get_user(current->thread.pcr_reg, user_pcr);
 583                 write_pcr(current->thread.pcr_reg);
 584                 current->thread.kernel_cntd0 =
 585                         current->thread.kernel_cntd1 = 0;
 586                 reset_pic();
 587                 break;
 588         }
 589
 590         case PERFCTR_GETPCR: {
 591                 u64 *user_pcr = (u64 *)arg0;
 592                 if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
 593                         err = -EINVAL;
 594                         break;
 595                 }
 596                 err |= __put_user(current->thread.pcr_reg, user_pcr);
 597                 break;
 598         }
 599
 600         default:
 601                 err = -EINVAL;
 602                 break;
 603         };
 604         return err;
 605 }