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                 if (IS_ENABLED(CONFIG_PPC32))
  22                         // On 32-bit the index we are passed refers to 32-bit words
  23                         *data = ((u32 *)child->thread.fp_state.fpr)[fpidx];
  24                 else
  25                         memcpy(data, &child->thread.TS_FPR(fpidx), sizeof(long));
  26         } else
  27                 *data = child->thread.fp_state.fpscr;
  28 #else
  29         *data = 0;
  30 #endif
  31
  32         return 0;
  33 }
  34
  35 int ptrace_put_fpr(struct task_struct *child, int index, unsigned long data)
  36 {
  37 #ifdef CONFIG_PPC_FPU_REGS
  38         unsigned int fpidx = index - PT_FPR0;
  39 #endif
  40
  41         if (index > PT_FPSCR)
  42                 return -EIO;
  43
  44 #ifdef CONFIG_PPC_FPU_REGS
  45         flush_fp_to_thread(child);
  46         if (fpidx < (PT_FPSCR - PT_FPR0)) {
  47                 if (IS_ENABLED(CONFIG_PPC32))
  48                         // On 32-bit the index we are passed refers to 32-bit words
  49                         ((u32 *)child->thread.fp_state.fpr)[fpidx] = data;
  50                 else
  51                         memcpy(&child->thread.TS_FPR(fpidx), &data, sizeof(long));
  52         } else
  53                 child->thread.fp_state.fpscr = data;
  54 #endif
  55
  56         return 0;
  57 }
  58