LXR linux/arch/sparc/kernel/sys_sparc

   1/* linux/arch/sparc/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/mm.h>
  12#include <linux/fs.h>
  13#include <linux/file.h>
  14#include <linux/sem.h>
  15#include <linux/msg.h>
  16#include <linux/shm.h>
  17#include <linux/stat.h>
  18#include <linux/syscalls.h>
  19#include <linux/mman.h>
  20#include <linux/utsname.h>
  21#include <linux/smp.h>
  22#include <linux/smp_lock.h>
  23#include <linux/ipc.h>
  24
  25#include <asm/uaccess.h>
  26#include <asm/unistd.h>
  27
  28/* #define DEBUG_UNIMP_SYSCALL */
  29
  30/* XXX Make this per-binary type, this way we can detect the type of
  31 * XXX a binary.  Every Sparc executable calls this very early on.
  32 */
  33asmlinkage unsigned long sys_getpagesize(void)
  34{
  35        return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  36}
  37
  38#define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  39
  40unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  41{
  42        struct vm_area_struct * vmm;
  43
  44        if (flags & MAP_FIXED) {
  45                /* We do not accept a shared mapping if it would violate
  46                 * cache aliasing constraints.
  47                 */
  48                if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
  49                        return -EINVAL;
  50                return addr;
  51        }
  52
  53        /* See asm-sparc/uaccess.h */
  54        if (len > TASK_SIZE - PAGE_SIZE)
  55                return -ENOMEM;
  56        if (ARCH_SUN4C && len > 0x20000000)
  57                return -ENOMEM;
  58        if (!addr)
  59                addr = TASK_UNMAPPED_BASE;
  60
  61        if (flags & MAP_SHARED)
  62                addr = COLOUR_ALIGN(addr);
  63        else
  64                addr = PAGE_ALIGN(addr);
  65
  66        for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  67                /* At this point:  (!vmm || addr < vmm->vm_end). */
  68                if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
  69                        addr = PAGE_OFFSET;
  70                        vmm = find_vma(current->mm, PAGE_OFFSET);
  71                }
  72                if (TASK_SIZE - PAGE_SIZE - len < addr)
  73                        return -ENOMEM;
  74                if (!vmm || addr + len <= vmm->vm_start)
  75                        return addr;
  76                addr = vmm->vm_end;
  77                if (flags & MAP_SHARED)
  78                        addr = COLOUR_ALIGN(addr);
  79        }
  80}
  81
  82asmlinkage unsigned long sparc_brk(unsigned long brk)
  83{
  84        if(ARCH_SUN4C) {
  85                if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
  86                        return current->mm->brk;
  87        }
  88        return sys_brk(brk);
  89}
  90
  91/*
  92 * sys_pipe() is the normal C calling standard for creating
  93 * a pipe. It's not the way unix traditionally does this, though.
  94 */
  95asmlinkage int sparc_pipe(struct pt_regs *regs)
  96{
  97        int fd[2];
  98        int error;
  99
 100        error = do_pipe_flags(fd, 0);
 101        if (error)
 102                goto out;
 103        regs->u_regs[UREG_I1] = fd[1];
 104        error = fd[0];
 105out:
 106        return error;
 107}
 108
 109/*
 110 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 111 *
 112 * This is really horribly ugly.
 113 */
 114
 115asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
 116{
 117        int version, err;
 118
 119        version = call >> 16; /* hack for backward compatibility */
 120        call &= 0xffff;
 121
 122        if (call <= SEMCTL)
 123                switch (call) {
 124                case SEMOP:
 125                        err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
 126                        goto out;
 127                case SEMTIMEDOP:
 128                        err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
 129                        goto out;
 130                case SEMGET:
 131                        err = sys_semget (first, second, third);
 132                        goto out;
 133                case SEMCTL: {
 134                        union semun fourth;
 135                        err = -EINVAL;
 136                        if (!ptr)
 137                                goto out;
 138                        err = -EFAULT;
 139                        if (get_user(fourth.__pad,
 140                                     (void __user * __user *)ptr))
 141                                goto out;
 142                        err = sys_semctl (first, second, third, fourth);
 143                        goto out;
 144                        }
 145                default:
 146                        err = -ENOSYS;
 147                        goto out;
 148                }
 149        if (call <= MSGCTL) 
 150                switch (call) {
 151                case MSGSND:
 152                        err = sys_msgsnd (first, (struct msgbuf __user *) ptr, 
 153                                          second, third);
 154                        goto out;
 155                case MSGRCV:
 156                        switch (version) {
 157                        case 0: {
 158                                struct ipc_kludge tmp;
 159                                err = -EINVAL;
 160                                if (!ptr)
 161                                        goto out;
 162                                err = -EFAULT;
 163                                if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
 164                                        goto out;
 165                                err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
 166                                goto out;
 167                                }
 168                        case 1: default:
 169                                err = sys_msgrcv (first,
 170                                                  (struct msgbuf __user *) ptr,
 171                                                  second, fifth, third);
 172                                goto out;
 173                        }
 174                case MSGGET:
 175                        err = sys_msgget ((key_t) first, second);
 176                        goto out;
 177                case MSGCTL:
 178                        err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 179                        goto out;
 180                default:
 181                        err = -ENOSYS;
 182                        goto out;
 183                }
 184        if (call <= SHMCTL) 
 185                switch (call) {
 186                case SHMAT:
 187                        switch (version) {
 188                        case 0: default: {
 189                                ulong raddr;
 190                                err = do_shmat (first, (char __user *) ptr, second, &raddr);
 191                                if (err)
 192                                        goto out;
 193                                err = -EFAULT;
 194                                if (put_user (raddr, (ulong __user *) third))
 195                                        goto out;
 196                                err = 0;
 197                                goto out;
 198                                }
 199                        case 1: /* iBCS2 emulator entry point */
 200                                err = -EINVAL;
 201                                goto out;
 202                        }
 203                case SHMDT: 
 204                        err = sys_shmdt ((char __user *)ptr);
 205                        goto out;
 206                case SHMGET:
 207                        err = sys_shmget (first, second, third);
 208                        goto out;
 209                case SHMCTL:
 210                        err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
 211                        goto out;
 212                default:
 213                        err = -ENOSYS;
 214                        goto out;
 215                }
 216        else
 217                err = -ENOSYS;
 218out:
 219        return err;
 220}
 221
 222int sparc_mmap_check(unsigned long addr, unsigned long len)
 223{
 224        if (ARCH_SUN4C &&
 225            (len > 0x20000000 ||
 226             (addr < 0xe0000000 && addr + len > 0x20000000)))
 227                return -EINVAL;
 228
 229        /* See asm-sparc/uaccess.h */
 230        if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 231                return -EINVAL;
 232
 233        return 0;
 234}
 235
 236/* Linux version of mmap */
 237static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 238        unsigned long prot, unsigned long flags, unsigned long fd,
 239        unsigned long pgoff)
 240{
 241        struct file * file = NULL;
 242        unsigned long retval = -EBADF;
 243
 244        if (!(flags & MAP_ANONYMOUS)) {
 245                file = fget(fd);
 246                if (!file)
 247                        goto out;
 248        }
 249
 250        len = PAGE_ALIGN(len);
 251        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 252
 253        down_write(&current->mm->mmap_sem);
 254        retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 255        up_write(&current->mm->mmap_sem);
 256
 257        if (file)
 258                fput(file);
 259out:
 260        return retval;
 261}
 262
 263asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 264        unsigned long prot, unsigned long flags, unsigned long fd,
 265        unsigned long pgoff)
 266{
 267        /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 268           we have. */
 269        return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 270}
 271
 272asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 273        unsigned long prot, unsigned long flags, unsigned long fd,
 274        unsigned long off)
 275{
 276        return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 277}
 278
 279long sparc_remap_file_pages(unsigned long start, unsigned long size,
 280                           unsigned long prot, unsigned long pgoff,
 281                           unsigned long flags)
 282{
 283        /* This works on an existing mmap so we don't need to validate
 284         * the range as that was done at the original mmap call.
 285         */
 286        return sys_remap_file_pages(start, size, prot,
 287                                    (pgoff >> (PAGE_SHIFT - 12)), flags);
 288}
 289
 290extern unsigned long do_mremap(unsigned long addr,
 291        unsigned long old_len, unsigned long new_len,
 292        unsigned long flags, unsigned long new_addr);
 293                
 294asmlinkage unsigned long sparc_mremap(unsigned long addr,
 295        unsigned long old_len, unsigned long new_len,
 296        unsigned long flags, unsigned long new_addr)
 297{
 298        unsigned long ret = -EINVAL;
 299
 300        if (unlikely(sparc_mmap_check(addr, old_len)))
 301                goto out;
 302        if (unlikely(sparc_mmap_check(new_addr, new_len)))
 303                goto out;
 304        down_write(&current->mm->mmap_sem);
 305        ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 306        up_write(&current->mm->mmap_sem);
 307out:
 308        return ret;       
 309}
 310
 311/* we come to here via sys_nis_syscall so it can setup the regs argument */
 312asmlinkage unsigned long
 313c_sys_nis_syscall (struct pt_regs *regs)
 314{
 315        static int count = 0;
 316
 317        if (count++ > 5)
 318                return -ENOSYS;
 319        printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 320                current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 321#ifdef DEBUG_UNIMP_SYSCALL      
 322        show_regs (regs);
 323#endif
 324        return -ENOSYS;
 325}
 326
 327/* #define DEBUG_SPARC_BREAKPOINT */
 328
 329asmlinkage void
 330sparc_breakpoint (struct pt_regs *regs)
 331{
 332        siginfo_t info;
 333
 334        lock_kernel();
 335#ifdef DEBUG_SPARC_BREAKPOINT
 336        printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 337#endif
 338        info.si_signo = SIGTRAP;
 339        info.si_errno = 0;
 340        info.si_code = TRAP_BRKPT;
 341        info.si_addr = (void __user *)regs->pc;
 342        info.si_trapno = 0;
 343        force_sig_info(SIGTRAP, &info, current);
 344
 345#ifdef DEBUG_SPARC_BREAKPOINT
 346        printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 347#endif
 348        unlock_kernel();
 349}
 350
 351asmlinkage int
 352sparc_sigaction (int sig, const struct old_sigaction __user *act,
 353                 struct old_sigaction __user *oact)
 354{
 355        struct k_sigaction new_ka, old_ka;
 356        int ret;
 357
 358        WARN_ON_ONCE(sig >= 0);
 359        sig = -sig;
 360
 361        if (act) {
 362                unsigned long mask;
 363
 364                if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 365                    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 366                    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 367                        return -EFAULT;
 368                __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 369                __get_user(mask, &act->sa_mask);
 370                siginitset(&new_ka.sa.sa_mask, mask);
 371                new_ka.ka_restorer = NULL;
 372        }
 373
 374        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 375
 376        if (!ret && oact) {
 377                /* In the clone() case we could copy half consistent
 378                 * state to the user, however this could sleep and
 379                 * deadlock us if we held the signal lock on SMP.  So for
 380                 * now I take the easy way out and do no locking.
 381                 */
 382                if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 383                    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 384                    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 385                        return -EFAULT;
 386                __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 387                __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 388        }
 389
 390        return ret;
 391}
 392
 393asmlinkage long
 394sys_rt_sigaction(int sig,
 395                 const struct sigaction __user *act,
 396                 struct sigaction __user *oact,
 397                 void __user *restorer,
 398                 size_t sigsetsize)
 399{
 400        struct k_sigaction new_ka, old_ka;
 401        int ret;
 402
 403        /* XXX: Don't preclude handling different sized sigset_t's.  */
 404        if (sigsetsize != sizeof(sigset_t))
 405                return -EINVAL;
 406
 407        if (act) {
 408                new_ka.ka_restorer = restorer;
 409                if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 410                        return -EFAULT;
 411        }
 412
 413        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 414
 415        if (!ret && oact) {
 416                if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 417                        return -EFAULT;
 418        }
 419
 420        return ret;
 421}
 422
 423asmlinkage int sys_getdomainname(char __user *name, int len)
 424{
 425        int nlen, err;
 426        
 427        if (len < 0)
 428                return -EINVAL;
 429
 430        down_read(&uts_sem);
 431        
 432        nlen = strlen(utsname()->domainname) + 1;
 433        err = -EINVAL;
 434        if (nlen > len)
 435                goto out;
 436
 437        err = -EFAULT;
 438        if (!copy_to_user(name, utsname()->domainname, nlen))
 439                err = 0;
 440
 441out:
 442        up_read(&uts_sem);
 443        return err;
 444}
 445
 446/*
 447 * Do a system call from kernel instead of calling sys_execve so we
 448 * end up with proper pt_regs.
 449 */
 450int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 451{
 452        long __res;
 453        register long __g1 __asm__ ("g1") = __NR_execve;
 454        register long __o0 __asm__ ("o0") = (long)(filename);
 455        register long __o1 __asm__ ("o1") = (long)(argv);
 456        register long __o2 __asm__ ("o2") = (long)(envp);
 457        asm volatile ("t 0x10\n\t"
 458                      "bcc 1f\n\t"
 459                      "mov %%o0, %0\n\t"
 460                      "sub %%g0, %%o0, %0\n\t"
 461                      "1:\n\t"
 462                      : "=r" (__res), "=&r" (__o0)
 463                      : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 464                      : "cc");
 465        return __res;
 466}
 467