arch/sparc/kernel/sigutil_32.c

   1 #include <linux/kernel.h>
   2 #include <linux/types.h>
   3 #include <linux/thread_info.h>
   4 #include <linux/uaccess.h>
   5 #include <linux/sched.h>
   6
   7 #include <asm/sigcontext.h>
   8 #include <asm/fpumacro.h>
   9 #include <asm/ptrace.h>
  10
  11 #include "sigutil.h"
  12
  13 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  14 {
  15         int err = 0;
  16 #ifdef CONFIG_SMP
  17         if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
  18                 put_psr(get_psr() | PSR_EF);
  19                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
  20                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
  21                 regs->psr &= ~(PSR_EF);
  22                 clear_tsk_thread_flag(current, TIF_USEDFPU);
  23         }
  24 #else
  25         if (current == last_task_used_math) {
  26                 put_psr(get_psr() | PSR_EF);
  27                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
  28                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
  29                 last_task_used_math = NULL;
  30                 regs->psr &= ~(PSR_EF);
  31         }
  32 #endif
  33         err |= __copy_to_user(&fpu->si_float_regs[0],
  34                               &current->thread.float_regs[0],
  35                               (sizeof(unsigned long) * 32));
  36         err |= __put_user(current->thread.fsr, &fpu->si_fsr);
  37         err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  38         if (current->thread.fpqdepth != 0)
  39                 err |= __copy_to_user(&fpu->si_fpqueue[0],
  40                                       &current->thread.fpqueue[0],
  41                                       ((sizeof(unsigned long) +
  42                                       (sizeof(unsigned long *)))*16));
  43         clear_used_math();
  44         return err;
  45 }
  46
  47 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  48 {
  49         int err;
  50 #ifdef CONFIG_SMP
  51         if (test_tsk_thread_flag(current, TIF_USEDFPU))
  52                 regs->psr &= ~PSR_EF;
  53 #else
  54         if (current == last_task_used_math) {
  55                 last_task_used_math = NULL;
  56                 regs->psr &= ~PSR_EF;
  57         }
  58 #endif
  59         set_used_math();
  60         clear_tsk_thread_flag(current, TIF_USEDFPU);
  61
  62         if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
  63                 return -EFAULT;
  64
  65         err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
  66                                (sizeof(unsigned long) * 32));
  67         err |= __get_user(current->thread.fsr, &fpu->si_fsr);
  68         err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  69         if (current->thread.fpqdepth != 0)
  70                 err |= __copy_from_user(&current->thread.fpqueue[0],
  71                                         &fpu->si_fpqueue[0],
  72                                         ((sizeof(unsigned long) +
  73                                         (sizeof(unsigned long *)))*16));
  74         return err;
  75 }
  76
  77 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  78 {
  79         int i, err = __put_user(wsaved, &rwin->wsaved);
  80
  81         for (i = 0; i < wsaved; i++) {
  82                 struct reg_window32 *rp;
  83                 unsigned long fp;
  84
  85                 rp = &current_thread_info()->reg_window[i];
  86                 fp = current_thread_info()->rwbuf_stkptrs[i];
  87                 err |= copy_to_user(&rwin->reg_window[i], rp,
  88                                     sizeof(struct reg_window32));
  89                 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  90         }
  91         return err;
  92 }
  93
  94 int restore_rwin_state(__siginfo_rwin_t __user *rp)
  95 {
  96         struct thread_info *t = current_thread_info();
  97         int i, wsaved, err;
  98
  99         __get_user(wsaved, &rp->wsaved);
 100         if (wsaved > NSWINS)
 101                 return -EFAULT;
 102
 103         err = 0;
 104         for (i = 0; i < wsaved; i++) {
 105                 err |= copy_from_user(&t->reg_window[i],
 106                                       &rp->reg_window[i],
 107                                       sizeof(struct reg_window32));
 108                 err |= __get_user(t->rwbuf_stkptrs[i],
 109                                   &rp->rwbuf_stkptrs[i]);
 110         }
 111         if (err)
 112                 return err;
 113
 114         t->w_saved = wsaved;
 115         synchronize_user_stack();
 116         if (t->w_saved)
 117                 return -EFAULT;
 118         return 0;
 119
 120 }