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sys_sparc.c

/* linux/arch/sparc64/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/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/utsname.h>
#include <linux/smp.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/ipc.h>
#include <linux/personality.h>
#include <linux/random.h>

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

#include "entry.h"
#include "systbls.h"

/* #define DEBUG_UNIMP_SYSCALL */

asmlinkage unsigned long sys_getpagesize(void)
{
      return PAGE_SIZE;
}

#define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
#define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))

/* Does addr --> addr+len fall within 4GB of the VA-space hole or
 * overflow past the end of the 64-bit address space?
 */
static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
{
      unsigned long va_exclude_start, va_exclude_end;

      va_exclude_start = VA_EXCLUDE_START;
      va_exclude_end   = VA_EXCLUDE_END;

      if (unlikely(len >= va_exclude_start))
            return 1;

      if (unlikely((addr + len) < addr))
            return 1;

      if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
                 ((addr + len) >= va_exclude_start &&
                  (addr + len) < va_exclude_end)))
            return 1;

      return 0;
}

/* Does start,end straddle the VA-space hole?  */
static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
{
      unsigned long va_exclude_start, va_exclude_end;

      va_exclude_start = VA_EXCLUDE_START;
      va_exclude_end   = VA_EXCLUDE_END;

      if (likely(start < va_exclude_start && end < va_exclude_start))
            return 0;

      if (likely(start >= va_exclude_end && end >= va_exclude_end))
            return 0;

      return 1;
}

/* These functions differ from the default implementations in
 * mm/mmap.c in two ways:
 *
 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
 *    for fixed such mappings we just validate what the user gave us.
 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
 *    the spitfire/niagara VA-hole.
 */

static inline unsigned long COLOUR_ALIGN(unsigned long addr,
                               unsigned long pgoff)
{
      unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
      unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);

      return base + off;
}

static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
                                    unsigned long pgoff)
{
      unsigned long base = addr & ~(SHMLBA-1);
      unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);

      if (base + off <= addr)
            return base + off;
      return base - off;
}

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
      struct mm_struct *mm = current->mm;
      struct vm_area_struct * vma;
      unsigned long task_size = TASK_SIZE;
      unsigned long start_addr;
      int do_color_align;

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

      if (test_thread_flag(TIF_32BIT))
            task_size = STACK_TOP32;
      if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
            return -ENOMEM;

      do_color_align = 0;
      if (filp || (flags & MAP_SHARED))
            do_color_align = 1;

      if (addr) {
            if (do_color_align)
                  addr = COLOUR_ALIGN(addr, pgoff);
            else
                  addr = PAGE_ALIGN(addr);

            vma = find_vma(mm, addr);
            if (task_size - len >= addr &&
                (!vma || addr + len <= vma->vm_start))
                  return addr;
      }

      if (len > mm->cached_hole_size) {
              start_addr = addr = mm->free_area_cache;
      } else {
              start_addr = addr = TASK_UNMAPPED_BASE;
              mm->cached_hole_size = 0;
      }

      task_size -= len;

full_search:
      if (do_color_align)
            addr = COLOUR_ALIGN(addr, pgoff);
      else
            addr = PAGE_ALIGN(addr);

      for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
            /* At this point:  (!vma || addr < vma->vm_end). */
            if (addr < VA_EXCLUDE_START &&
                (addr + len) >= VA_EXCLUDE_START) {
                  addr = VA_EXCLUDE_END;
                  vma = find_vma(mm, VA_EXCLUDE_END);
            }
            if (unlikely(task_size < addr)) {
                  if (start_addr != TASK_UNMAPPED_BASE) {
                        start_addr = addr = TASK_UNMAPPED_BASE;
                        mm->cached_hole_size = 0;
                        goto full_search;
                  }
                  return -ENOMEM;
            }
            if (likely(!vma || addr + len <= vma->vm_start)) {
                  /*
                   * Remember the place where we stopped the search:
                   */
                  mm->free_area_cache = addr + len;
                  return addr;
            }
            if (addr + mm->cached_hole_size < vma->vm_start)
                    mm->cached_hole_size = vma->vm_start - addr;

            addr = vma->vm_end;
            if (do_color_align)
                  addr = COLOUR_ALIGN(addr, pgoff);
      }
}

unsigned long
arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
                    const unsigned long len, const unsigned long pgoff,
                    const unsigned long flags)
{
      struct vm_area_struct *vma;
      struct mm_struct *mm = current->mm;
      unsigned long task_size = STACK_TOP32;
      unsigned long addr = addr0;
      int do_color_align;

      /* This should only ever run for 32-bit processes.  */
      BUG_ON(!test_thread_flag(TIF_32BIT));

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

      if (unlikely(len > task_size))
            return -ENOMEM;

      do_color_align = 0;
      if (filp || (flags & MAP_SHARED))
            do_color_align = 1;

      /* requesting a specific address */
      if (addr) {
            if (do_color_align)
                  addr = COLOUR_ALIGN(addr, pgoff);
            else
                  addr = PAGE_ALIGN(addr);

            vma = find_vma(mm, addr);
            if (task_size - len >= addr &&
                (!vma || addr + len <= vma->vm_start))
                  return addr;
      }

      /* check if free_area_cache is useful for us */
      if (len <= mm->cached_hole_size) {
              mm->cached_hole_size = 0;
            mm->free_area_cache = mm->mmap_base;
      }

      /* either no address requested or can't fit in requested address hole */
      addr = mm->free_area_cache;
      if (do_color_align) {
            unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);

            addr = base + len;
      }

      /* make sure it can fit in the remaining address space */
      if (likely(addr > len)) {
            vma = find_vma(mm, addr-len);
            if (!vma || addr <= vma->vm_start) {
                  /* remember the address as a hint for next time */
                  return (mm->free_area_cache = addr-len);
            }
      }

      if (unlikely(mm->mmap_base < len))
            goto bottomup;

      addr = mm->mmap_base-len;
      if (do_color_align)
            addr = COLOUR_ALIGN_DOWN(addr, pgoff);

      do {
            /*
             * Lookup failure means no vma is above this address,
             * else if new region fits below vma->vm_start,
             * return with success:
             */
            vma = find_vma(mm, addr);
            if (likely(!vma || addr+len <= vma->vm_start)) {
                  /* remember the address as a hint for next time */
                  return (mm->free_area_cache = addr);
            }

            /* remember the largest hole we saw so far */
            if (addr + mm->cached_hole_size < vma->vm_start)
                    mm->cached_hole_size = vma->vm_start - addr;

            /* try just below the current vma->vm_start */
            addr = vma->vm_start-len;
            if (do_color_align)
                  addr = COLOUR_ALIGN_DOWN(addr, pgoff);
      } while (likely(len < vma->vm_start));

bottomup:
      /*
       * A failed mmap() very likely causes application failure,
       * so fall back to the bottom-up function here. This scenario
       * can happen with large stack limits and large mmap()
       * allocations.
       */
      mm->cached_hole_size = ~0UL;
      mm->free_area_cache = TASK_UNMAPPED_BASE;
      addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
      /*
       * Restore the topdown base:
       */
      mm->free_area_cache = mm->mmap_base;
      mm->cached_hole_size = ~0UL;

      return addr;
}

/* Try to align mapping such that we align it as much as possible. */
unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
      unsigned long align_goal, addr = -ENOMEM;

      if (flags & MAP_FIXED) {
            /* Ok, don't mess with it. */
            return get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
      }
      flags &= ~MAP_SHARED;

      align_goal = PAGE_SIZE;
      if (len >= (4UL * 1024 * 1024))
            align_goal = (4UL * 1024 * 1024);
      else if (len >= (512UL * 1024))
            align_goal = (512UL * 1024);
      else if (len >= (64UL * 1024))
            align_goal = (64UL * 1024);

      do {
            addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
            if (!(addr & ~PAGE_MASK)) {
                  addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
                  break;
            }

            if (align_goal == (4UL * 1024 * 1024))
                  align_goal = (512UL * 1024);
            else if (align_goal == (512UL * 1024))
                  align_goal = (64UL * 1024);
            else
                  align_goal = PAGE_SIZE;
      } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);

      /* Mapping is smaller than 64K or larger areas could not
       * be obtained.
       */
      if (addr & ~PAGE_MASK)
            addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);

      return addr;
}

/* Essentially the same as PowerPC... */
void arch_pick_mmap_layout(struct mm_struct *mm)
{
      unsigned long random_factor = 0UL;

      if (current->flags & PF_RANDOMIZE) {
            random_factor = get_random_int();
            if (test_thread_flag(TIF_32BIT))
                  random_factor &= ((1 * 1024 * 1024) - 1);
            else
                  random_factor = ((random_factor << PAGE_SHIFT) &
                               0xffffffffUL);
      }

      /*
       * Fall back to the standard layout if the personality
       * bit is set, or if the expected stack growth is unlimited:
       */
      if (!test_thread_flag(TIF_32BIT) ||
          (current->personality & ADDR_COMPAT_LAYOUT) ||
          current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
          sysctl_legacy_va_layout) {
            mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
            mm->get_unmapped_area = arch_get_unmapped_area;
            mm->unmap_area = arch_unmap_area;
      } else {
            /* We know it's 32-bit */
            unsigned long task_size = STACK_TOP32;
            unsigned long gap;

            gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
            if (gap < 128 * 1024 * 1024)
                  gap = 128 * 1024 * 1024;
            if (gap > (task_size / 6 * 5))
                  gap = (task_size / 6 * 5);

            mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
            mm->get_unmapped_area = arch_get_unmapped_area_topdown;
            mm->unmap_area = arch_unmap_area_topdown;
      }
}

asmlinkage unsigned long sparc_brk(unsigned long brk)
{
      /* People could try to be nasty and use ta 0x6d in 32bit programs */
      if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
            return current->mm->brk;

      if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
            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 long 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 long sys_ipc(unsigned int call, int first, unsigned long second,
                  unsigned long third, void __user *ptr, long fifth)
{
      long err;

      /* No need for backward compatibility. We can start fresh... */
      if (call <= SEMCTL) {
            switch (call) {
            case SEMOP:
                  err = sys_semtimedop(first, ptr,
                                   (unsigned)second, NULL);
                  goto out;
            case SEMTIMEDOP:
                  err = sys_semtimedop(first, ptr, (unsigned)second,
                        (const struct timespec __user *)
                                   (unsigned long) fifth);
                  goto out;
            case SEMGET:
                  err = sys_semget(first, (int)second, (int)third);
                  goto out;
            case SEMCTL: {
                  err = sys_semctl(first, second,
                               (int)third | IPC_64,
                               (union semun) ptr);
                  goto out;
            }
            default:
                  err = -ENOSYS;
                  goto out;
            };
      }
      if (call <= MSGCTL) {
            switch (call) {
            case MSGSND:
                  err = sys_msgsnd(first, ptr, (size_t)second,
                               (int)third);
                  goto out;
            case MSGRCV:
                  err = sys_msgrcv(first, ptr, (size_t)second, fifth,
                               (int)third);
                  goto out;
            case MSGGET:
                  err = sys_msgget((key_t)first, (int)second);
                  goto out;
            case MSGCTL:
                  err = sys_msgctl(first, (int)second | IPC_64, ptr);
                  goto out;
            default:
                  err = -ENOSYS;
                  goto out;
            };
      }
      if (call <= SHMCTL) {
            switch (call) {
            case SHMAT: {
                  ulong raddr;
                  err = do_shmat(first, ptr, (int)second, &raddr);
                  if (!err) {
                        if (put_user(raddr,
                                   (ulong __user *) third))
                              err = -EFAULT;
                  }
                  goto out;
            }
            case SHMDT:
                  err = sys_shmdt(ptr);
                  goto out;
            case SHMGET:
                  err = sys_shmget(first, (size_t)second, (int)third);
                  goto out;
            case SHMCTL:
                  err = sys_shmctl(first, (int)second | IPC_64, ptr);
                  goto out;
            default:
                  err = -ENOSYS;
                  goto out;
            };
      } else {
            err = -ENOSYS;
      }
out:
      return err;
}

asmlinkage long sparc64_newuname(struct new_utsname __user *name)
{
      int ret = sys_newuname(name);
      
      if (current->personality == PER_LINUX32 && !ret) {
            ret = (copy_to_user(name->machine, "sparc\0\0", 8)
                   ? -EFAULT : 0);
      }
      return ret;
}

asmlinkage long sparc64_personality(unsigned long personality)
{
      int ret;

      if (current->personality == PER_LINUX32 &&
          personality == PER_LINUX)
            personality = PER_LINUX32;
      ret = sys_personality(personality);
      if (ret == PER_LINUX32)
            ret = PER_LINUX;

      return ret;
}

int sparc_mmap_check(unsigned long addr, unsigned long len)
{
      if (test_thread_flag(TIF_32BIT)) {
            if (len >= STACK_TOP32)
                  return -EINVAL;

            if (addr > STACK_TOP32 - len)
                  return -EINVAL;
      } else {
            if (len >= VA_EXCLUDE_START)
                  return -EINVAL;

            if (invalid_64bit_range(addr, len))
                  return -EINVAL;
      }

      return 0;
}

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

      if (!(flags & MAP_ANONYMOUS)) {
            file = fget(fd);
            if (!file)
                  goto out;
      }
      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
      len = PAGE_ALIGN(len);

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

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

asmlinkage long sys64_munmap(unsigned long addr, size_t len)
{
      long ret;

      if (invalid_64bit_range(addr, len))
            return -EINVAL;

      down_write(&current->mm->mmap_sem);
      ret = do_munmap(current->mm, addr, len);
      up_write(&current->mm->mmap_sem);
      return ret;
}

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 sys64_mremap(unsigned long addr,
      unsigned long old_len, unsigned long new_len,
      unsigned long flags, unsigned long new_addr)
{
      unsigned long ret = -EINVAL;

      if (test_thread_flag(TIF_32BIT))
            goto out;
      if (unlikely(new_len >= VA_EXCLUDE_START))
            goto out;
      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;
      
      /* Don't make the system unusable, if someone goes stuck */
      if (count++ > 5)
            return -ENOSYS;

      printk ("Unimplemented SPARC system call %ld\n",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;

      if (test_thread_flag(TIF_32BIT)) {
            regs->tpc &= 0xffffffff;
            regs->tnpc &= 0xffffffff;
      }
#ifdef DEBUG_SPARC_BREAKPOINT
        printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
      info.si_signo = SIGTRAP;
      info.si_errno = 0;
      info.si_code = TRAP_BRKPT;
      info.si_addr = (void __user *)regs->tpc;
      info.si_trapno = 0;
      force_sig_info(SIGTRAP, &info, current);
#ifdef DEBUG_SPARC_BREAKPOINT
      printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
}

extern void check_pending(int signum);

asmlinkage long 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;
}

asmlinkage long sys_utrap_install(utrap_entry_t type,
                          utrap_handler_t new_p,
                          utrap_handler_t new_d,
                          utrap_handler_t __user *old_p,
                          utrap_handler_t __user *old_d)
{
      if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
            return -EINVAL;
      if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
            if (old_p) {
                  if (!current_thread_info()->utraps) {
                        if (put_user(NULL, old_p))
                              return -EFAULT;
                  } else {
                        if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
                              return -EFAULT;
                  }
            }
            if (old_d) {
                  if (put_user(NULL, old_d))
                        return -EFAULT;
            }
            return 0;
      }
      if (!current_thread_info()->utraps) {
            current_thread_info()->utraps =
                  kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
            if (!current_thread_info()->utraps)
                  return -ENOMEM;
            current_thread_info()->utraps[0] = 1;
      } else {
            if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
                current_thread_info()->utraps[0] > 1) {
                  unsigned long *p = current_thread_info()->utraps;

                  current_thread_info()->utraps =
                        kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
                              GFP_KERNEL);
                  if (!current_thread_info()->utraps) {
                        current_thread_info()->utraps = p;
                        return -ENOMEM;
                  }
                  p[0]--;
                  current_thread_info()->utraps[0] = 1;
                  memcpy(current_thread_info()->utraps+1, p+1,
                         UT_TRAP_INSTRUCTION_31*sizeof(long));
            }
      }
      if (old_p) {
            if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
                  return -EFAULT;
      }
      if (old_d) {
            if (put_user(NULL, old_d))
                  return -EFAULT;
      }
      current_thread_info()->utraps[type] = (long)new_p;

      return 0;
}

asmlinkage long sparc_memory_ordering(unsigned long model,
                              struct pt_regs *regs)
{
      if (model >= 3)
            return -EINVAL;
      regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
      return 0;
}

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;
}

/* Invoked by rtrap code to update performance counters in
 * user space.
 */
asmlinkage void update_perfctrs(void)
{
      unsigned long pic, tmp;

      read_pic(pic);
      tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
      __put_user(tmp, current_thread_info()->user_cntd0);
      tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
      __put_user(tmp, current_thread_info()->user_cntd1);
      reset_pic();
}

asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
{
      int err = 0;

      switch(opcode) {
      case PERFCTR_ON:
            current_thread_info()->pcr_reg = arg2;
            current_thread_info()->user_cntd0 = (u64 __user *) arg0;
            current_thread_info()->user_cntd1 = (u64 __user *) arg1;
            current_thread_info()->kernel_cntd0 =
                  current_thread_info()->kernel_cntd1 = 0;
            write_pcr(arg2);
            reset_pic();
            set_thread_flag(TIF_PERFCTR);
            break;

      case PERFCTR_OFF:
            err = -EINVAL;
            if (test_thread_flag(TIF_PERFCTR)) {
                  current_thread_info()->user_cntd0 =
                        current_thread_info()->user_cntd1 = NULL;
                  current_thread_info()->pcr_reg = 0;
                  write_pcr(0);
                  clear_thread_flag(TIF_PERFCTR);
                  err = 0;
            }
            break;

      case PERFCTR_READ: {
            unsigned long pic, tmp;

            if (!test_thread_flag(TIF_PERFCTR)) {
                  err = -EINVAL;
                  break;
            }
            read_pic(pic);
            tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
            err |= __put_user(tmp, current_thread_info()->user_cntd0);
            tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
            err |= __put_user(tmp, current_thread_info()->user_cntd1);
            reset_pic();
            break;
      }

      case PERFCTR_CLRPIC:
            if (!test_thread_flag(TIF_PERFCTR)) {
                  err = -EINVAL;
                  break;
            }
            current_thread_info()->kernel_cntd0 =
                  current_thread_info()->kernel_cntd1 = 0;
            reset_pic();
            break;

      case PERFCTR_SETPCR: {
            u64 __user *user_pcr = (u64 __user *)arg0;

            if (!test_thread_flag(TIF_PERFCTR)) {
                  err = -EINVAL;
                  break;
            }
            err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
            write_pcr(current_thread_info()->pcr_reg);
            current_thread_info()->kernel_cntd0 =
                  current_thread_info()->kernel_cntd1 = 0;
            reset_pic();
            break;
      }

      case PERFCTR_GETPCR: {
            u64 __user *user_pcr = (u64 __user *)arg0;

            if (!test_thread_flag(TIF_PERFCTR)) {
                  err = -EINVAL;
                  break;
            }
            err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
            break;
      }

      default:
            err = -EINVAL;
            break;
      };
      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 0x6d\n\t"
                  "sub %%g0, %%o0, %0\n\t"
                  "movcc %%xcc, %%o0, %0\n\t"
                  : "=r" (__res), "=&r" (__o0)
                  : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
                  : "cc");
      return __res;
}

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