text: #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/thread_info.h>
  #include <linux/uaccess.h>
  #include <linux/sched.h>
  
  #include <asm/sigcontext.h>
  #include <asm/fpumacro.h>
  #include <asm/ptrace.h>
  
  #include "sigutil.h"
  
  int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  {
  	int err = 0;
  #ifdef CONFIG_SMP
  	if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
  		put_psr(get_psr() | PSR_EF);
  		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
  		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
  		regs->psr &= ~(PSR_EF);
  		clear_tsk_thread_flag(current, TIF_USEDFPU);
  	}
  #else
  	if (current == last_task_used_math) {
  		put_psr(get_psr() | PSR_EF);
  		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
  		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
  		last_task_used_math = NULL;
  		regs->psr &= ~(PSR_EF);
  	}
  #endif
  	err |= __copy_to_user(&fpu->si_float_regs[0],
  			      &current->thread.float_regs[0],
  			      (sizeof(unsigned long) * 32));
  	err |= __put_user(current->thread.fsr, &fpu->si_fsr);
  	err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  	if (current->thread.fpqdepth != 0)
  		err |= __copy_to_user(&fpu->si_fpqueue[0],
  				      &current->thread.fpqueue[0],
  				      ((sizeof(unsigned long) +
  				      (sizeof(unsigned long *)))*16));
  	clear_used_math();
  	return err;
  }
  
  int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  {
  	int err;
  #ifdef CONFIG_SMP
  	if (test_tsk_thread_flag(current, TIF_USEDFPU))
  		regs->psr &= ~PSR_EF;
  #else
  	if (current == last_task_used_math) {
  		last_task_used_math = NULL;
  		regs->psr &= ~PSR_EF;
  	}
  #endif
  	set_used_math();
  	clear_tsk_thread_flag(current, TIF_USEDFPU);
  
  	if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
  		return -EFAULT;
  
  	err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
  			       (sizeof(unsigned long) * 32));
  	err |= __get_user(current->thread.fsr, &fpu->si_fsr);
  	err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  	if (current->thread.fpqdepth != 0)
  		err |= __copy_from_user(&current->thread.fpqueue[0],
  					&fpu->si_fpqueue[0],
  					((sizeof(unsigned long) +
  					(sizeof(unsigned long *)))*16));
  	return err;
  }
  
  int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  {
  	int i, err = __put_user(wsaved, &rwin->wsaved);
  
  	for (i = 0; i < wsaved; i++) {
  		struct reg_window32 *rp;
  		unsigned long fp;
  
  		rp = &current_thread_info()->reg_window[i];
  		fp = current_thread_info()->rwbuf_stkptrs[i];
  		err |= copy_to_user(&rwin->reg_window[i], rp,
  				    sizeof(struct reg_window32));
  		err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  	}
  	return err;
  }
  
  int restore_rwin_state(__siginfo_rwin_t __user *rp)
  {
  	struct thread_info *t = current_thread_info();
  	int i, wsaved, err;
  
  	__get_user(wsaved, &rp->wsaved);
  	if (wsaved > NSWINS)
  		return -EFAULT;
  
  	err = 0;
  	for (i = 0; i < wsaved; i++) {
  		err |= copy_from_user(&t->reg_window[i],
  				      &rp->reg_window[i],
  				      sizeof(struct reg_window32));
  		err |= __get_user(t->rwbuf_stkptrs[i],
  				  &rp->rwbuf_stkptrs[i]);
  	}
  	if (err)
  		return err;
  
  	t->w_saved = wsaved;
  	synchronize_user_stack();
  	if (t->w_saved)
  		return -EFAULT;
  	return 0;
  
  }
  