LXR linux/arch/sparc/kernel/sys

   1/* $Id: sys_sparc.c,v 1.70 2001/04/14 01:12:02 davem Exp $
   2 * linux/arch/sparc/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/errno.h>
  10#include <linux/types.h>
  11#include <linux/sched.h>
  12#include <linux/mm.h>
  13#include <linux/fs.h>
  14#include <linux/file.h>
  15#include <linux/sem.h>
  16#include <linux/msg.h>
  17#include <linux/shm.h>
  18#include <linux/stat.h>
  19#include <linux/syscalls.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/ipc.h>
  25
  26#include <asm/uaccess.h>
  27#include <asm/unistd.h>
  28
  29/* #define DEBUG_UNIMP_SYSCALL */
  30
  31/* XXX Make this per-binary type, this way we can detect the type of
  32 * XXX a binary.  Every Sparc executable calls this very early on.
  33 */
  34asmlinkage unsigned long sys_getpagesize(void)
  35{
  36        return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  37}
  38
  39#define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  40
  41unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  42{
  43        struct vm_area_struct * vmm;
  44
  45        if (flags & MAP_FIXED) {
  46                /* We do not accept a shared mapping if it would violate
  47                 * cache aliasing constraints.
  48                 */
  49                if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
  50                        return -EINVAL;
  51                return addr;
  52        }
  53
  54        /* See asm-sparc/uaccess.h */
  55        if (len > TASK_SIZE - PAGE_SIZE)
  56                return -ENOMEM;
  57        if (ARCH_SUN4C_SUN4 && len > 0x20000000)
  58                return -ENOMEM;
  59        if (!addr)
  60                addr = TASK_UNMAPPED_BASE;
  61
  62        if (flags & MAP_SHARED)
  63                addr = COLOUR_ALIGN(addr);
  64        else
  65                addr = PAGE_ALIGN(addr);
  66
  67        for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  68                /* At this point:  (!vmm || addr < vmm->vm_end). */
  69                if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) {
  70                        addr = PAGE_OFFSET;
  71                        vmm = find_vma(current->mm, PAGE_OFFSET);
  72                }
  73                if (TASK_SIZE - PAGE_SIZE - len < addr)
  74                        return -ENOMEM;
  75                if (!vmm || addr + len <= vmm->vm_start)
  76                        return addr;
  77                addr = vmm->vm_end;
  78                if (flags & MAP_SHARED)
  79                        addr = COLOUR_ALIGN(addr);
  80        }
  81}
  82
  83asmlinkage unsigned long sparc_brk(unsigned long brk)
  84{
  85        if(ARCH_SUN4C_SUN4) {
  86                if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
  87                        return current->mm->brk;
  88        }
  89        return sys_brk(brk);
  90}
  91
  92/*
  93 * sys_pipe() is the normal C calling standard for creating
  94 * a pipe. It's not the way unix traditionally does this, though.
  95 */
  96asmlinkage int sparc_pipe(struct pt_regs *regs)
  97{
  98        int fd[2];
  99        int error;
 100
 101        error = do_pipe(fd);
 102        if (error)
 103                goto out;
 104        regs->u_regs[UREG_I1] = fd[1];
 105        error = fd[0];
 106out:
 107        return error;
 108}
 109
 110/*
 111 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 112 *
 113 * This is really horribly ugly.
 114 */
 115
 116asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
 117{
 118        int version, err;
 119
 120        version = call >> 16; /* hack for backward compatibility */
 121        call &= 0xffff;
 122
 123        if (call <= SEMCTL)
 124                switch (call) {
 125                case SEMOP:
 126                        err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
 127                        goto out;
 128                case SEMTIMEDOP:
 129                        err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
 130                        goto out;
 131                case SEMGET:
 132                        err = sys_semget (first, second, third);
 133                        goto out;
 134                case SEMCTL: {
 135                        union semun fourth;
 136                        err = -EINVAL;
 137                        if (!ptr)
 138                                goto out;
 139                        err = -EFAULT;
 140                        if (get_user(fourth.__pad,
 141                                     (void __user * __user *)ptr))
 142                                goto out;
 143                        err = sys_semctl (first, second, third, fourth);
 144                        goto out;
 145                        }
 146                default:
 147                        err = -ENOSYS;
 148                        goto out;
 149                }
 150        if (call <= MSGCTL) 
 151                switch (call) {
 152                case MSGSND:
 153                        err = sys_msgsnd (first, (struct msgbuf __user *) ptr, 
 154                                          second, third);
 155                        goto out;
 156                case MSGRCV:
 157                        switch (version) {
 158                        case 0: {
 159                                struct ipc_kludge tmp;
 160                                err = -EINVAL;
 161                                if (!ptr)
 162                                        goto out;
 163                                err = -EFAULT;
 164                                if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
 165                                        goto out;
 166                                err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
 167                                goto out;
 168                                }
 169                        case 1: default:
 170                                err = sys_msgrcv (first,
 171                                                  (struct msgbuf __user *) ptr,
 172                                                  second, fifth, third);
 173                                goto out;
 174                        }
 175                case MSGGET:
 176                        err = sys_msgget ((key_t) first, second);
 177                        goto out;
 178                case MSGCTL:
 179                        err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 180                        goto out;
 181                default:
 182                        err = -ENOSYS;
 183                        goto out;
 184                }
 185        if (call <= SHMCTL) 
 186                switch (call) {
 187                case SHMAT:
 188                        switch (version) {
 189                        case 0: default: {
 190                                ulong raddr;
 191                                err = do_shmat (first, (char __user *) ptr, second, &raddr);
 192                                if (err)
 193                                        goto out;
 194                                err = -EFAULT;
 195                                if (put_user (raddr, (ulong __user *) third))
 196                                        goto out;
 197                                err = 0;
 198                                goto out;
 199                                }
 200                        case 1: /* iBCS2 emulator entry point */
 201                                err = -EINVAL;
 202                                goto out;
 203                        }
 204                case SHMDT: 
 205                        err = sys_shmdt ((char __user *)ptr);
 206                        goto out;
 207                case SHMGET:
 208                        err = sys_shmget (first, second, third);
 209                        goto out;
 210                case SHMCTL:
 211                        err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
 212                        goto out;
 213                default:
 214                        err = -ENOSYS;
 215                        goto out;
 216                }
 217        else
 218                err = -ENOSYS;
 219out:
 220        return err;
 221}
 222
 223int sparc_mmap_check(unsigned long addr, unsigned long len, unsigned long flags)
 224{
 225        if (ARCH_SUN4C_SUN4 &&
 226            (len > 0x20000000 ||
 227             ((flags & MAP_FIXED) &&
 228              addr < 0xe0000000 && addr + len > 0x20000000)))
 229                return -EINVAL;
 230
 231        /* See asm-sparc/uaccess.h */
 232        if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 233                return -EINVAL;
 234
 235        return 0;
 236}
 237
 238/* Linux version of mmap */
 239static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 240        unsigned long prot, unsigned long flags, unsigned long fd,
 241        unsigned long pgoff)
 242{
 243        struct file * file = NULL;
 244        unsigned long retval = -EBADF;
 245
 246        if (!(flags & MAP_ANONYMOUS)) {
 247                file = fget(fd);
 248                if (!file)
 249                        goto out;
 250        }
 251
 252        len = PAGE_ALIGN(len);
 253        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 254
 255        down_write(&current->mm->mmap_sem);
 256        retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 257        up_write(&current->mm->mmap_sem);
 258
 259        if (file)
 260                fput(file);
 261out:
 262        return retval;
 263}
 264
 265asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 266        unsigned long prot, unsigned long flags, unsigned long fd,
 267        unsigned long pgoff)
 268{
 269        /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 270           we have. */
 271        return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 272}
 273
 274asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 275        unsigned long prot, unsigned long flags, unsigned long fd,
 276        unsigned long off)
 277{
 278        return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 279}
 280
 281long sparc_remap_file_pages(unsigned long start, unsigned long size,
 282                           unsigned long prot, unsigned long pgoff,
 283                           unsigned long flags)
 284{
 285        /* This works on an existing mmap so we don't need to validate
 286         * the range as that was done at the original mmap call.
 287         */
 288        return sys_remap_file_pages(start, size, prot,
 289                                    (pgoff >> (PAGE_SHIFT - 12)), flags);
 290}
 291
 292extern unsigned long do_mremap(unsigned long addr,
 293        unsigned long old_len, unsigned long new_len,
 294        unsigned long flags, unsigned long new_addr);
 295                
 296asmlinkage unsigned long sparc_mremap(unsigned long addr,
 297        unsigned long old_len, unsigned long new_len,
 298        unsigned long flags, unsigned long new_addr)
 299{
 300        struct vm_area_struct *vma;
 301        unsigned long ret = -EINVAL;
 302        if (ARCH_SUN4C_SUN4) {
 303                if (old_len > 0x20000000 || new_len > 0x20000000)
 304                        goto out;
 305                if (addr < 0xe0000000 && addr + old_len > 0x20000000)
 306                        goto out;
 307        }
 308        if (old_len > TASK_SIZE - PAGE_SIZE ||
 309            new_len > TASK_SIZE - PAGE_SIZE)
 310                goto out;
 311        down_write(&current->mm->mmap_sem);
 312        if (flags & MREMAP_FIXED) {
 313                if (ARCH_SUN4C_SUN4 &&
 314                    new_addr < 0xe0000000 &&
 315                    new_addr + new_len > 0x20000000)
 316                        goto out_sem;
 317                if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
 318                        goto out_sem;
 319        } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
 320                    addr + new_len > 0x20000000) ||
 321                   addr + new_len > TASK_SIZE - PAGE_SIZE) {
 322                unsigned long map_flags = 0;
 323                struct file *file = NULL;
 324
 325                ret = -ENOMEM;
 326                if (!(flags & MREMAP_MAYMOVE))
 327                        goto out_sem;
 328
 329                vma = find_vma(current->mm, addr);
 330                if (vma) {
 331                        if (vma->vm_flags & VM_SHARED)
 332                                map_flags |= MAP_SHARED;
 333                        file = vma->vm_file;
 334                }
 335
 336                new_addr = get_unmapped_area(file, addr, new_len,
 337                                     vma ? vma->vm_pgoff : 0,
 338                                     map_flags);
 339                ret = new_addr;
 340                if (new_addr & ~PAGE_MASK)
 341                        goto out_sem;
 342                flags |= MREMAP_FIXED;
 343        }
 344        ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 345out_sem:
 346        up_write(&current->mm->mmap_sem);
 347out:
 348        return ret;       
 349}
 350
 351/* we come to here via sys_nis_syscall so it can setup the regs argument */
 352asmlinkage unsigned long
 353c_sys_nis_syscall (struct pt_regs *regs)
 354{
 355        static int count = 0;
 356
 357        if (count++ > 5)
 358                return -ENOSYS;
 359        printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 360                current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 361#ifdef DEBUG_UNIMP_SYSCALL      
 362        show_regs (regs);
 363#endif
 364        return -ENOSYS;
 365}
 366
 367/* #define DEBUG_SPARC_BREAKPOINT */
 368
 369asmlinkage void
 370sparc_breakpoint (struct pt_regs *regs)
 371{
 372        siginfo_t info;
 373
 374        lock_kernel();
 375#ifdef DEBUG_SPARC_BREAKPOINT
 376        printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 377#endif
 378        info.si_signo = SIGTRAP;
 379        info.si_errno = 0;
 380        info.si_code = TRAP_BRKPT;
 381        info.si_addr = (void __user *)regs->pc;
 382        info.si_trapno = 0;
 383        force_sig_info(SIGTRAP, &info, current);
 384
 385#ifdef DEBUG_SPARC_BREAKPOINT
 386        printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 387#endif
 388        unlock_kernel();
 389}
 390
 391asmlinkage int
 392sparc_sigaction (int sig, const struct old_sigaction __user *act,
 393                 struct old_sigaction __user *oact)
 394{
 395        struct k_sigaction new_ka, old_ka;
 396        int ret;
 397
 398        if (sig < 0) {
 399                current->thread.new_signal = 1;
 400                sig = -sig;
 401        }
 402
 403        if (act) {
 404                unsigned long mask;
 405
 406                if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 407                    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 408                    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 409                        return -EFAULT;
 410                __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 411                __get_user(mask, &act->sa_mask);
 412                siginitset(&new_ka.sa.sa_mask, mask);
 413                new_ka.ka_restorer = NULL;
 414        }
 415
 416        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 417
 418        if (!ret && oact) {
 419                /* In the clone() case we could copy half consistent
 420                 * state to the user, however this could sleep and
 421                 * deadlock us if we held the signal lock on SMP.  So for
 422                 * now I take the easy way out and do no locking.
 423                 */
 424                if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 425                    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 426                    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 427                        return -EFAULT;
 428                __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 429                __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 430        }
 431
 432        return ret;
 433}
 434
 435asmlinkage long
 436sys_rt_sigaction(int sig,
 437                 const struct sigaction __user *act,
 438                 struct sigaction __user *oact,
 439                 void __user *restorer,
 440                 size_t sigsetsize)
 441{
 442        struct k_sigaction new_ka, old_ka;
 443        int ret;
 444
 445        /* XXX: Don't preclude handling different sized sigset_t's.  */
 446        if (sigsetsize != sizeof(sigset_t))
 447                return -EINVAL;
 448
 449        /* All tasks which use RT signals (effectively) use
 450         * new style signals.
 451         */
 452        current->thread.new_signal = 1;
 453
 454        if (act) {
 455                new_ka.ka_restorer = restorer;
 456                if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 457                        return -EFAULT;
 458        }
 459
 460        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 461
 462        if (!ret && oact) {
 463                if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 464                        return -EFAULT;
 465        }
 466
 467        return ret;
 468}
 469
 470asmlinkage int sys_getdomainname(char __user *name, int len)
 471{
 472        int nlen, err;
 473        
 474        if (len < 0)
 475                return -EINVAL;
 476
 477        down_read(&uts_sem);
 478        
 479        nlen = strlen(utsname()->domainname) + 1;
 480        err = -EINVAL;
 481        if (nlen > len)
 482                goto out;
 483
 484        err = -EFAULT;
 485        if (!copy_to_user(name, utsname()->domainname, nlen))
 486                err = 0;
 487
 488out:
 489        up_read(&uts_sem);
 490        return err;
 491}
 492
 493/*
 494 * Do a system call from kernel instead of calling sys_execve so we
 495 * end up with proper pt_regs.
 496 */
 497int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 498{
 499        long __res;
 500        register long __g1 __asm__ ("g1") = __NR_execve;
 501        register long __o0 __asm__ ("o0") = (long)(filename);
 502        register long __o1 __asm__ ("o1") = (long)(argv);
 503        register long __o2 __asm__ ("o2") = (long)(envp);
 504        asm volatile ("t 0x10\n\t"
 505                      "bcc 1f\n\t"
 506                      "mov %%o0, %0\n\t"
 507                      "sub %%g0, %%o0, %0\n\t"
 508                      "1:\n\t"
 509                      : "=r" (__res), "=&r" (__o0)
 510                      : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 511                      : "cc");
 512        return __res;
 513}
 514