root/arch/sparc/kernel/sigutil_64.c

DEFINITIONS

1. save_fpu_state
2. restore_fpu_state
3. save_rwin_state
4. restore_rwin_state

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kernel.h>
   3 #include <linux/types.h>
   4 #include <linux/thread_info.h>
   5 #include <linux/uaccess.h>
   6 #include <linux/errno.h>
   7 
   8 #include <asm/sigcontext.h>
   9 #include <asm/fpumacro.h>
  10 #include <asm/ptrace.h>
  11 #include <asm/switch_to.h>
  12 
  13 #include "sigutil.h"
  14 
  15 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  16 {
  17         unsigned long *fpregs = current_thread_info()->fpregs;
  18         unsigned long fprs;
  19         int err = 0;
  20         
  21         fprs = current_thread_info()->fpsaved[0];
  22         if (fprs & FPRS_DL)
  23                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
  24                                     (sizeof(unsigned int) * 32));
  25         if (fprs & FPRS_DU)
  26                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
  27                                     (sizeof(unsigned int) * 32));
  28         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  29         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  30         err |= __put_user(fprs, &fpu->si_fprs);
  31 
  32         return err;
  33 }
  34 
  35 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  36 {
  37         unsigned long *fpregs = current_thread_info()->fpregs;
  38         unsigned long fprs;
  39         int err;
  40 
  41         if (((unsigned long) fpu) & 7)
  42                 return -EFAULT;
  43 
  44         err = get_user(fprs, &fpu->si_fprs);
  45         fprs_write(0);
  46         regs->tstate &= ~TSTATE_PEF;
  47         if (fprs & FPRS_DL)
  48                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
  49                                (sizeof(unsigned int) * 32));
  50         if (fprs & FPRS_DU)
  51                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
  52                                (sizeof(unsigned int) * 32));
  53         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  54         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  55         current_thread_info()->fpsaved[0] |= fprs;
  56         return err;
  57 }
  58 
  59 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  60 {
  61         int i, err = __put_user(wsaved, &rwin->wsaved);
  62 
  63         for (i = 0; i < wsaved; i++) {
  64                 struct reg_window *rp = &current_thread_info()->reg_window[i];
  65                 unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
  66 
  67                 err |= copy_to_user(&rwin->reg_window[i], rp,
  68                                     sizeof(struct reg_window));
  69                 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  70         }
  71         return err;
  72 }
  73 
  74 int restore_rwin_state(__siginfo_rwin_t __user *rp)
  75 {
  76         struct thread_info *t = current_thread_info();
  77         int i, wsaved, err;
  78 
  79         if (((unsigned long) rp) & 7)
  80                 return -EFAULT;
  81 
  82         get_user(wsaved, &rp->wsaved);
  83         if (wsaved > NSWINS)
  84                 return -EFAULT;
  85 
  86         err = 0;
  87         for (i = 0; i < wsaved; i++) {
  88                 err |= copy_from_user(&t->reg_window[i],
  89                                       &rp->reg_window[i],
  90                                       sizeof(struct reg_window));
  91                 err |= __get_user(t->rwbuf_stkptrs[i],
  92                                   &rp->rwbuf_stkptrs[i]);
  93         }
  94         if (err)
  95                 return err;
  96 
  97         set_thread_wsaved(wsaved);
  98         synchronize_user_stack();
  99         if (get_thread_wsaved())
 100                 return -EFAULT;
 101         return 0;
 102 }