kernel/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 #include <asm/switch_to.h>
  11
  12 #include "sigutil.h"
  13
  14 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  15 {
  16         int err = 0;
  17 #ifdef CONFIG_SMP
  18         if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
  19                 put_psr(get_psr() | PSR_EF);
  20                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
  21                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
  22                 regs->psr &= ~(PSR_EF);
  23                 clear_tsk_thread_flag(current, TIF_USEDFPU);
  24         }
  25 #else
  26         if (current == last_task_used_math) {
  27                 put_psr(get_psr() | PSR_EF);
  28                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
  29                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
  30                 last_task_used_math = NULL;
  31                 regs->psr &= ~(PSR_EF);
  32         }
  33 #endif
  34         err |= __copy_to_user(&fpu->si_float_regs[0],
  35                               &current->thread.float_regs[0],
  36                               (sizeof(unsigned long) * 32));
  37         err |= __put_user(current->thread.fsr, &fpu->si_fsr);
  38         err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  39         if (current->thread.fpqdepth != 0)
  40                 err |= __copy_to_user(&fpu->si_fpqueue[0],
  41                                       &current->thread.fpqueue[0],
  42                                       ((sizeof(unsigned long) +
  43                                       (sizeof(unsigned long *)))*16));
  44         clear_used_math();
  45         return err;
  46 }
  47
  48 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  49 {
  50         int err;
  51
  52         if (((unsigned long) fpu) & 3)
  53                 return -EFAULT;
  54
  55 #ifdef CONFIG_SMP
  56         if (test_tsk_thread_flag(current, TIF_USEDFPU))
  57                 regs->psr &= ~PSR_EF;
  58 #else
  59         if (current == last_task_used_math) {
  60                 last_task_used_math = NULL;
  61                 regs->psr &= ~PSR_EF;
  62         }
  63 #endif
  64         set_used_math();
  65         clear_tsk_thread_flag(current, TIF_USEDFPU);
  66
  67         if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
  68                 return -EFAULT;
  69
  70         err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
  71                                (sizeof(unsigned long) * 32));
  72         err |= __get_user(current->thread.fsr, &fpu->si_fsr);
  73         err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  74         if (current->thread.fpqdepth != 0)
  75                 err |= __copy_from_user(&current->thread.fpqueue[0],
  76                                         &fpu->si_fpqueue[0],
  77                                         ((sizeof(unsigned long) +
  78                                         (sizeof(unsigned long *)))*16));
  79         return err;
  80 }
  81
  82 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  83 {
  84         int i, err = __put_user(wsaved, &rwin->wsaved);
  85
  86         for (i = 0; i < wsaved; i++) {
  87                 struct reg_window32 *rp;
  88                 unsigned long fp;
  89
  90                 rp = &current_thread_info()->reg_window[i];
  91                 fp = current_thread_info()->rwbuf_stkptrs[i];
  92                 err |= copy_to_user(&rwin->reg_window[i], rp,
  93                                     sizeof(struct reg_window32));
  94                 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  95         }
  96         return err;
  97 }
  98
  99 int restore_rwin_state(__siginfo_rwin_t __user *rp)
 100 {
 101         struct thread_info *t = current_thread_info();
 102         int i, wsaved, err;
 103
 104         if (((unsigned long) rp) & 3)
 105                 return -EFAULT;
 106
 107         get_user(wsaved, &rp->wsaved);
 108         if (wsaved > NSWINS)
 109                 return -EFAULT;
 110
 111         err = 0;
 112         for (i = 0; i < wsaved; i++) {
 113                 err |= copy_from_user(&t->reg_window[i],
 114                                       &rp->reg_window[i],
 115                                       sizeof(struct reg_window32));
 116                 err |= __get_user(t->rwbuf_stkptrs[i],
 117                                   &rp->rwbuf_stkptrs[i]);
 118         }
 119         if (err)
 120                 return err;
 121
 122         t->w_saved = wsaved;
 123         synchronize_user_stack();
 124         if (t->w_saved)
 125                 return -EFAULT;
 126         return 0;
 127
 128 }