arch/powerpc/kernel/ptrace/ptrace-fpu.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <linux/regset.h>
   4
   5 #include <asm/switch_to.h>
   6
   7 #include "ptrace-decl.h"
   8
   9 int ptrace_get_fpr(struct task_struct *child, int index, unsigned long *data)
  10 {
  11         unsigned int fpidx = index - PT_FPR0;
  12
  13         if (index > PT_FPSCR)
  14                 return -EIO;
  15
  16         flush_fp_to_thread(child);
  17         if (fpidx < (PT_FPSCR - PT_FPR0))
  18                 memcpy(data, &child->thread.TS_FPR(fpidx), sizeof(long));
  19         else
  20                 *data = child->thread.fp_state.fpscr;
  21
  22         return 0;
  23 }
  24
  25 int ptrace_put_fpr(struct task_struct *child, int index, unsigned long data)
  26 {
  27         unsigned int fpidx = index - PT_FPR0;
  28
  29         if (index > PT_FPSCR)
  30                 return -EIO;
  31
  32         flush_fp_to_thread(child);
  33         if (fpidx < (PT_FPSCR - PT_FPR0))
  34                 memcpy(&child->thread.TS_FPR(fpidx), &data, sizeof(long));
  35         else
  36                 child->thread.fp_state.fpscr = data;
  37
  38         return 0;
  39 }
  40