arch/sparc/kernel/sigutil_64.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/errno.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         unsigned long *fpregs = current_thread_info()->fpregs;
  17         unsigned long fprs;
  18         int err = 0;
  19
  20         fprs = current_thread_info()->fpsaved[0];
  21         if (fprs & FPRS_DL)
  22                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
  23                                     (sizeof(unsigned int) * 32));
  24         if (fprs & FPRS_DU)
  25                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
  26                                     (sizeof(unsigned int) * 32));
  27         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  28         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  29         err |= __put_user(fprs, &fpu->si_fprs);
  30
  31         return err;
  32 }
  33
  34 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  35 {
  36         unsigned long *fpregs = current_thread_info()->fpregs;
  37         unsigned long fprs;
  38         int err;
  39
  40         err = __get_user(fprs, &fpu->si_fprs);
  41         fprs_write(0);
  42         regs->tstate &= ~TSTATE_PEF;
  43         if (fprs & FPRS_DL)
  44                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
  45                                (sizeof(unsigned int) * 32));
  46         if (fprs & FPRS_DU)
  47                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
  48                                (sizeof(unsigned int) * 32));
  49         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  50         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  51         current_thread_info()->fpsaved[0] |= fprs;
  52         return err;
  53 }
  54
  55 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  56 {
  57         int i, err = __put_user(wsaved, &rwin->wsaved);
  58
  59         for (i = 0; i < wsaved; i++) {
  60                 struct reg_window *rp = &current_thread_info()->reg_window[i];
  61                 unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
  62
  63                 err |= copy_to_user(&rwin->reg_window[i], rp,
  64                                     sizeof(struct reg_window));
  65                 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  66         }
  67         return err;
  68 }
  69
  70 int restore_rwin_state(__siginfo_rwin_t __user *rp)
  71 {
  72         struct thread_info *t = current_thread_info();
  73         int i, wsaved, err;
  74
  75         __get_user(wsaved, &rp->wsaved);
  76         if (wsaved > NSWINS)
  77                 return -EFAULT;
  78
  79         err = 0;
  80         for (i = 0; i < wsaved; i++) {
  81                 err |= copy_from_user(&t->reg_window[i],
  82                                       &rp->reg_window[i],
  83                                       sizeof(struct reg_window));
  84                 err |= __get_user(t->rwbuf_stkptrs[i],
  85                                   &rp->rwbuf_stkptrs[i]);
  86         }
  87         if (err)
  88                 return err;
  89
  90         set_thread_wsaved(wsaved);
  91         synchronize_user_stack();
  92         if (get_thread_wsaved())
  93                 return -EFAULT;
  94         return 0;
  95 }