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 #ifdef CONFIG_PPC_FPU_REGS
  12         unsigned int fpidx = index - PT_FPR0;
  13 #endif
  14
  15         if (index > PT_FPSCR)
  16                 return -EIO;
  17
  18 #ifdef CONFIG_PPC_FPU_REGS
  19         flush_fp_to_thread(child);
  20         if (fpidx < (PT_FPSCR - PT_FPR0))
  21                 memcpy(data, &child->thread.TS_FPR(fpidx), sizeof(long));
  22         else
  23                 *data = child->thread.fp_state.fpscr;
  24 #else
  25         *data = 0;
  26 #endif
  27
  28         return 0;
  29 }
  30
  31 int ptrace_put_fpr(struct task_struct *child, int index, unsigned long data)
  32 {
  33 #ifdef CONFIG_PPC_FPU_REGS
  34         unsigned int fpidx = index - PT_FPR0;
  35 #endif
  36
  37         if (index > PT_FPSCR)
  38                 return -EIO;
  39
  40 #ifdef CONFIG_PPC_FPU_REGS
  41         flush_fp_to_thread(child);
  42         if (fpidx < (PT_FPSCR - PT_FPR0))
  43                 memcpy(&child->thread.TS_FPR(fpidx), &data, sizeof(long));
  44         else
  45                 child->thread.fp_state.fpscr = data;
  46 #endif
  47
  48         return 0;
  49 }
  50