Logo Search packages:      
Sourcecode: linux version File versions  Download package

sys_sparc.c

/* linux/arch/sparc/kernel/sys_sparc.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/sparc
 * platform.
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/utsname.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/ipc.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>

/* #define DEBUG_UNIMP_SYSCALL */

/* XXX Make this per-binary type, this way we can detect the type of
 * XXX a binary.  Every Sparc executable calls this very early on.
 */
asmlinkage unsigned long sys_getpagesize(void)
{
      return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
}

#define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
      struct vm_area_struct * vmm;

      if (flags & MAP_FIXED) {
            /* We do not accept a shared mapping if it would violate
             * cache aliasing constraints.
             */
            if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
                  return -EINVAL;
            return addr;
      }

      /* See asm-sparc/uaccess.h */
      if (len > TASK_SIZE - PAGE_SIZE)
            return -ENOMEM;
      if (ARCH_SUN4C_SUN4 && len > 0x20000000)
            return -ENOMEM;
      if (!addr)
            addr = TASK_UNMAPPED_BASE;

      if (flags & MAP_SHARED)
            addr = COLOUR_ALIGN(addr);
      else
            addr = PAGE_ALIGN(addr);

      for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
            /* At this point:  (!vmm || addr < vmm->vm_end). */
            if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) {
                  addr = PAGE_OFFSET;
                  vmm = find_vma(current->mm, PAGE_OFFSET);
            }
            if (TASK_SIZE - PAGE_SIZE - len < addr)
                  return -ENOMEM;
            if (!vmm || addr + len <= vmm->vm_start)
                  return addr;
            addr = vmm->vm_end;
            if (flags & MAP_SHARED)
                  addr = COLOUR_ALIGN(addr);
      }
}

asmlinkage unsigned long sparc_brk(unsigned long brk)
{
      if(ARCH_SUN4C_SUN4) {
            if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
                  return current->mm->brk;
      }
      return sys_brk(brk);
}

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way unix traditionally does this, though.
 */
asmlinkage int sparc_pipe(struct pt_regs *regs)
{
      int fd[2];
      int error;

      error = do_pipe_flags(fd, 0);
      if (error)
            goto out;
      regs->u_regs[UREG_I1] = fd[1];
      error = fd[0];
out:
      return error;
}

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */

asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
{
      int version, err;

      version = call >> 16; /* hack for backward compatibility */
      call &= 0xffff;

      if (call <= SEMCTL)
            switch (call) {
            case SEMOP:
                  err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
                  goto out;
            case SEMTIMEDOP:
                  err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
                  goto out;
            case SEMGET:
                  err = sys_semget (first, second, third);
                  goto out;
            case SEMCTL: {
                  union semun fourth;
                  err = -EINVAL;
                  if (!ptr)
                        goto out;
                  err = -EFAULT;
                  if (get_user(fourth.__pad,
                             (void __user * __user *)ptr))
                        goto out;
                  err = sys_semctl (first, second, third, fourth);
                  goto out;
                  }
            default:
                  err = -ENOSYS;
                  goto out;
            }
      if (call <= MSGCTL) 
            switch (call) {
            case MSGSND:
                  err = sys_msgsnd (first, (struct msgbuf __user *) ptr, 
                                second, third);
                  goto out;
            case MSGRCV:
                  switch (version) {
                  case 0: {
                        struct ipc_kludge tmp;
                        err = -EINVAL;
                        if (!ptr)
                              goto out;
                        err = -EFAULT;
                        if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
                              goto out;
                        err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
                        goto out;
                        }
                  case 1: default:
                        err = sys_msgrcv (first,
                                      (struct msgbuf __user *) ptr,
                                      second, fifth, third);
                        goto out;
                  }
            case MSGGET:
                  err = sys_msgget ((key_t) first, second);
                  goto out;
            case MSGCTL:
                  err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
                  goto out;
            default:
                  err = -ENOSYS;
                  goto out;
            }
      if (call <= SHMCTL) 
            switch (call) {
            case SHMAT:
                  switch (version) {
                  case 0: default: {
                        ulong raddr;
                        err = do_shmat (first, (char __user *) ptr, second, &raddr);
                        if (err)
                              goto out;
                        err = -EFAULT;
                        if (put_user (raddr, (ulong __user *) third))
                              goto out;
                        err = 0;
                        goto out;
                        }
                  case 1:     /* iBCS2 emulator entry point */
                        err = -EINVAL;
                        goto out;
                  }
            case SHMDT: 
                  err = sys_shmdt ((char __user *)ptr);
                  goto out;
            case SHMGET:
                  err = sys_shmget (first, second, third);
                  goto out;
            case SHMCTL:
                  err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
                  goto out;
            default:
                  err = -ENOSYS;
                  goto out;
            }
      else
            err = -ENOSYS;
out:
      return err;
}

int sparc_mmap_check(unsigned long addr, unsigned long len)
{
      if (ARCH_SUN4C_SUN4 &&
          (len > 0x20000000 ||
           (addr < 0xe0000000 && addr + len > 0x20000000)))
            return -EINVAL;

      /* See asm-sparc/uaccess.h */
      if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
            return -EINVAL;

      return 0;
}

/* Linux version of mmap */
static unsigned long do_mmap2(unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags, unsigned long fd,
      unsigned long pgoff)
{
      struct file * file = NULL;
      unsigned long retval = -EBADF;

      if (!(flags & MAP_ANONYMOUS)) {
            file = fget(fd);
            if (!file)
                  goto out;
      }

      len = PAGE_ALIGN(len);
      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

      down_write(&current->mm->mmap_sem);
      retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
      up_write(&current->mm->mmap_sem);

      if (file)
            fput(file);
out:
      return retval;
}

asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags, unsigned long fd,
      unsigned long pgoff)
{
      /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
         we have. */
      return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
}

asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags, unsigned long fd,
      unsigned long off)
{
      return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
}

long sparc_remap_file_pages(unsigned long start, unsigned long size,
                     unsigned long prot, unsigned long pgoff,
                     unsigned long flags)
{
      /* This works on an existing mmap so we don't need to validate
       * the range as that was done at the original mmap call.
       */
      return sys_remap_file_pages(start, size, prot,
                            (pgoff >> (PAGE_SHIFT - 12)), flags);
}

extern unsigned long do_mremap(unsigned long addr,
      unsigned long old_len, unsigned long new_len,
      unsigned long flags, unsigned long new_addr);
                
asmlinkage unsigned long sparc_mremap(unsigned long addr,
      unsigned long old_len, unsigned long new_len,
      unsigned long flags, unsigned long new_addr)
{
      unsigned long ret = -EINVAL;

      if (unlikely(sparc_mmap_check(addr, old_len)))
            goto out;
      if (unlikely(sparc_mmap_check(new_addr, new_len)))
            goto out;
      down_write(&current->mm->mmap_sem);
      ret = do_mremap(addr, old_len, new_len, flags, new_addr);
      up_write(&current->mm->mmap_sem);
out:
      return ret;       
}

/* we come to here via sys_nis_syscall so it can setup the regs argument */
asmlinkage unsigned long
c_sys_nis_syscall (struct pt_regs *regs)
{
      static int count = 0;

      if (count++ > 5)
            return -ENOSYS;
      printk ("%s[%d]: Unimplemented SPARC system call %d\n",
            current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
#ifdef DEBUG_UNIMP_SYSCALL    
      show_regs (regs);
#endif
      return -ENOSYS;
}

/* #define DEBUG_SPARC_BREAKPOINT */

asmlinkage void
sparc_breakpoint (struct pt_regs *regs)
{
      siginfo_t info;

      lock_kernel();
#ifdef DEBUG_SPARC_BREAKPOINT
        printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
#endif
      info.si_signo = SIGTRAP;
      info.si_errno = 0;
      info.si_code = TRAP_BRKPT;
      info.si_addr = (void __user *)regs->pc;
      info.si_trapno = 0;
      force_sig_info(SIGTRAP, &info, current);

#ifdef DEBUG_SPARC_BREAKPOINT
      printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
#endif
      unlock_kernel();
}

asmlinkage int
sparc_sigaction (int sig, const struct old_sigaction __user *act,
             struct old_sigaction __user *oact)
{
      struct k_sigaction new_ka, old_ka;
      int ret;

      WARN_ON_ONCE(sig >= 0);
      sig = -sig;

      if (act) {
            unsigned long mask;

            if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
                __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
                __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
                  return -EFAULT;
            __get_user(new_ka.sa.sa_flags, &act->sa_flags);
            __get_user(mask, &act->sa_mask);
            siginitset(&new_ka.sa.sa_mask, mask);
            new_ka.ka_restorer = NULL;
      }

      ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

      if (!ret && oact) {
            /* In the clone() case we could copy half consistent
             * state to the user, however this could sleep and
             * deadlock us if we held the signal lock on SMP.  So for
             * now I take the easy way out and do no locking.
             */
            if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
                __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
                __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
                  return -EFAULT;
            __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
            __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
      }

      return ret;
}

asmlinkage long
sys_rt_sigaction(int sig,
             const struct sigaction __user *act,
             struct sigaction __user *oact,
             void __user *restorer,
             size_t sigsetsize)
{
      struct k_sigaction new_ka, old_ka;
      int ret;

      /* XXX: Don't preclude handling different sized sigset_t's.  */
      if (sigsetsize != sizeof(sigset_t))
            return -EINVAL;

      if (act) {
            new_ka.ka_restorer = restorer;
            if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
                  return -EFAULT;
      }

      ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

      if (!ret && oact) {
            if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
                  return -EFAULT;
      }

      return ret;
}

asmlinkage int sys_getdomainname(char __user *name, int len)
{
      int nlen, err;
      
      if (len < 0)
            return -EINVAL;

      down_read(&uts_sem);
      
      nlen = strlen(utsname()->domainname) + 1;
      err = -EINVAL;
      if (nlen > len)
            goto out;

      err = -EFAULT;
      if (!copy_to_user(name, utsname()->domainname, nlen))
            err = 0;

out:
      up_read(&uts_sem);
      return err;
}

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
      long __res;
      register long __g1 __asm__ ("g1") = __NR_execve;
      register long __o0 __asm__ ("o0") = (long)(filename);
      register long __o1 __asm__ ("o1") = (long)(argv);
      register long __o2 __asm__ ("o2") = (long)(envp);
      asm volatile ("t 0x10\n\t"
                  "bcc 1f\n\t"
                  "mov %%o0, %0\n\t"
                  "sub %%g0, %%o0, %0\n\t"
                  "1:\n\t"
                  : "=r" (__res), "=&r" (__o0)
                  : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
                  : "cc");
      return __res;
}

Generated by  Doxygen 1.6.0   Back to index