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
  11 #include "sigutil.h"
  12
  13 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  14 {
  15         unsigned long *fpregs = current_thread_info()->fpregs;
  16         unsigned long fprs;
  17         int err = 0;
  18
  19         fprs = current_thread_info()->fpsaved[0];
  20         if (fprs & FPRS_DL)
  21                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
  22                                     (sizeof(unsigned int) * 32));
  23         if (fprs & FPRS_DU)
  24                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
  25                                     (sizeof(unsigned int) * 32));
  26         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  27         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  28         err |= __put_user(fprs, &fpu->si_fprs);
  29
  30         return err;
  31 }
  32
  33 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  34 {
  35         unsigned long *fpregs = current_thread_info()->fpregs;
  36         unsigned long fprs;
  37         int err;
  38
  39         err = __get_user(fprs, &fpu->si_fprs);
  40         fprs_write(0);
  41         regs->tstate &= ~TSTATE_PEF;
  42         if (fprs & FPRS_DL)
  43                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
  44                                (sizeof(unsigned int) * 32));
  45         if (fprs & FPRS_DU)
  46                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
  47                                (sizeof(unsigned int) * 32));
  48         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  49         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  50         current_thread_info()->fpsaved[0] |= fprs;
  51         return err;
  52 }
  53
  54 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  55 {
  56         int i, err = __put_user(wsaved, &rwin->wsaved);
  57
  58         for (i = 0; i < wsaved; i++) {
  59                 struct reg_window *rp = &current_thread_info()->reg_window[i];
  60                 unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
  61
  62                 err |= copy_to_user(&rwin->reg_window[i], rp,
  63                                     sizeof(struct reg_window));
  64                 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  65         }
  66         return err;
  67 }
  68
  69 int restore_rwin_state(__siginfo_rwin_t __user *rp)
  70 {
  71         struct thread_info *t = current_thread_info();
  72         int i, wsaved, err;
  73
  74         __get_user(wsaved, &rp->wsaved);
  75         if (wsaved > NSWINS)
  76                 return -EFAULT;
  77
  78         err = 0;
  79         for (i = 0; i < wsaved; i++) {
  80                 err |= copy_from_user(&t->reg_window[i],
  81                                       &rp->reg_window[i],
  82                                       sizeof(struct reg_window));
  83                 err |= __get_user(t->rwbuf_stkptrs[i],
  84                                   &rp->rwbuf_stkptrs[i]);
  85         }
  86         if (err)
  87                 return err;
  88
  89         set_thread_wsaved(wsaved);
  90         synchronize_user_stack();
  91         if (get_thread_wsaved())
  92                 return -EFAULT;
  93         return 0;
  94 }