text: /* Native-dependent code for OpenBSD/mips64.
  
     Copyright (C) 2004-2019 Free Software Foundation, Inc.
  
     This file is part of GDB.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include "defs.h"
  #include "inferior.h"
  #include "regcache.h"
  #include "target.h"
  
  #include <sys/types.h>
  #include <sys/ptrace.h>
  #include <machine/reg.h>
  
  #include "mips-tdep.h"
  #include "inf-ptrace.h"
  #include "obsd-nat.h"
  
  /* Shorthand for some register numbers used below.  */
  #define MIPS_PC_REGNUM	MIPS_EMBED_PC_REGNUM
  #define MIPS_FP0_REGNUM	MIPS_EMBED_FP0_REGNUM
  #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
  
  struct mips64_obsd_nat_target final : public obsd_nat_target
  {
    void fetch_registers (struct regcache *, int) override;
    void store_registers (struct regcache *, int) override;
  };
  
  static mips64_obsd_nat_target the_mips64_obsd_nat_target;
  
  /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  
  static void
  mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)
  {
    const char *regs = gregs;
    int regnum;
  
    for (regnum = MIPS_ZERO_REGNUM; regnum <= MIPS_PC_REGNUM; regnum++)
      regcache->raw_supply (regnum, regs + regnum * 8);
  
    for (regnum = MIPS_FP0_REGNUM; regnum <= MIPS_FSR_REGNUM; regnum++)
      regcache->raw_supply (regnum, regs + (regnum + 2) * 8);
  }
  
  /* Collect the general-purpose registers from REGCACHE and store them
     in GREGS.  */
  
  static void
  mips64obsd_collect_gregset (const struct regcache *regcache,
  			    void *gregs, int regnum)
  {
    char *regs = gregs;
    int i;
  
    for (i = MIPS_ZERO_REGNUM; i <= MIPS_PC_REGNUM; i++)
      {
        if (regnum == -1 || regnum == i)
  	regcache->raw_collect (i, regs + i * 8);
      }
  
    for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
      {
        if (regnum == -1 || regnum == i)
  	regcache->raw_collect (i, regs + (i + 2) * 8);
      }
  }
  
  
  /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
     for all registers.  */
  
  void
  mips64_obsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
  {
    struct reg regs;
    pid_t pid = regcache->ptid ().pid ();
  
    if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
      perror_with_name (_("Couldn't get registers"));
  
    mips64obsd_supply_gregset (regcache, &regs);
  }
  
  /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
     this for all registers.  */
  
  static void
  mips64_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
  {
    struct reg regs;
    pid_t pid = regcache->ptid ().pid ();
  
    if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
      perror_with_name (_("Couldn't get registers"));
  
    mips64obsd_collect_gregset (regcache, &regs, regnum);
  
    if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
      perror_with_name (_("Couldn't write registers"));
  }
  
  void
  _initialize_mips64obsd_nat (void)
  {
    add_inf_child_target (&the_mips64_obsd_nat_target);
  }
  