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
   6 #include <asm/sigcontext.h>
   7 #include <asm/fpumacro.h>
   8 #include <asm/ptrace.h>
   9
  10 #include "sigutil.h"
  11
  12 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  13 {
  14         unsigned long *fpregs = current_thread_info()->fpregs;
  15         unsigned long fprs;
  16         int err = 0;
  17
  18         fprs = current_thread_info()->fpsaved[0];
  19         if (fprs & FPRS_DL)
  20                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
  21                                     (sizeof(unsigned int) * 32));
  22         if (fprs & FPRS_DU)
  23                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
  24                                     (sizeof(unsigned int) * 32));
  25         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  26         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  27         err |= __put_user(fprs, &fpu->si_fprs);
  28
  29         return err;
  30 }
  31
  32 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  33 {
  34         unsigned long *fpregs = current_thread_info()->fpregs;
  35         unsigned long fprs;
  36         int err;
  37
  38         err = __get_user(fprs, &fpu->si_fprs);
  39         fprs_write(0);
  40         regs->tstate &= ~TSTATE_PEF;
  41         if (fprs & FPRS_DL)
  42                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
  43                                (sizeof(unsigned int) * 32));
  44         if (fprs & FPRS_DU)
  45                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
  46                                (sizeof(unsigned int) * 32));
  47         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  48         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  49         current_thread_info()->fpsaved[0] |= fprs;
  50         return err;
  51 }
  52
  53 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  54 {
  55         int i, err = __put_user(wsaved, &rwin->wsaved);
  56
  57         for (i = 0; i < wsaved; i++) {
  58                 struct reg_window *rp = &current_thread_info()->reg_window[i];
  59                 unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
  60
  61                 err |= copy_to_user(&rwin->reg_window[i], rp,
  62                                     sizeof(struct reg_window));
  63                 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  64         }
  65         return err;
  66 }
  67
  68 int restore_rwin_state(__siginfo_rwin_t __user *rp)
  69 {
  70         struct thread_info *t = current_thread_info();
  71         int i, wsaved, err;
  72
  73         __get_user(wsaved, &rp->wsaved);
  74         if (wsaved > NSWINS)
  75                 return -EFAULT;
  76
  77         err = 0;
  78         for (i = 0; i < wsaved; i++) {
  79                 err |= copy_from_user(&t->reg_window[i],
  80                                       &rp->reg_window[i],
  81                                       sizeof(struct reg_window));
  82                 err |= __get_user(t->rwbuf_stkptrs[i],
  83                                   &rp->rwbuf_stkptrs[i]);
  84         }
  85         if (err)
  86                 return err;
  87
  88         set_thread_wsaved(wsaved);
  89         synchronize_user_stack();
  90         if (get_thread_wsaved())
  91                 return -EFAULT;
  92         return 0;
  93 }