text: /* Native-dependent code for FreeBSD/riscv.
  
     Copyright (C) 2018-2021 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 "regcache.h"
  #include "target.h"
  
  #include <sys/types.h>
  #include <sys/ptrace.h>
  #include <machine/reg.h>
  
  #include "fbsd-nat.h"
  #include "riscv-tdep.h"
  #include "riscv-fbsd-tdep.h"
  #include "inf-ptrace.h"
  
  struct riscv_fbsd_nat_target final : public fbsd_nat_target
  {
    void fetch_registers (struct regcache *, int) override;
    void store_registers (struct regcache *, int) override;
  };
  
  static riscv_fbsd_nat_target the_riscv_fbsd_nat_target;
  
  /* Determine if PT_GETREGS fetches REGNUM.  */
  
  static bool
  getregs_supplies (int regnum)
  {
    return ((regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM)
  	  || regnum == RISCV_CSR_SSTATUS_REGNUM);
  }
  
  /* Determine if PT_GETFPREGS fetches REGNUM.  */
  
  static bool
  getfpregs_supplies (int regnum)
  {
    return ((regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
  	  || regnum == RISCV_CSR_FCSR_REGNUM);
  }
  
  /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
     for all registers.  */
  
  void
  riscv_fbsd_nat_target::fetch_registers (struct regcache *regcache,
  					int regnum)
  {
    pid_t pid = get_ptrace_pid (regcache->ptid ());
  
    if (regnum == -1 || regnum == RISCV_ZERO_REGNUM)
      regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM);
    if (regnum == -1 || getregs_supplies (regnum))
      {
        struct reg regs;
  
        if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  	perror_with_name (_("Couldn't get registers"));
  
        regcache->supply_regset (&riscv_fbsd_gregset, regnum, &regs,
  			       sizeof (regs));
      }
  
    if (regnum == -1 || getfpregs_supplies (regnum))
      {
        struct fpreg fpregs;
  
        if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  	perror_with_name (_("Couldn't get floating point status"));
  
        regcache->supply_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
  			       sizeof (fpregs));
      }
  }
  
  /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
     this for all registers.  */
  
  void
  riscv_fbsd_nat_target::store_registers (struct regcache *regcache,
  					int regnum)
  {
    pid_t pid = get_ptrace_pid (regcache->ptid ());
  
    if (regnum == -1 || getregs_supplies (regnum))
      {
        struct reg regs;
  
        if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  	perror_with_name (_("Couldn't get registers"));
  
        regcache->collect_regset (&riscv_fbsd_gregset, regnum, &regs,
  			       sizeof (regs));
  
        if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  	perror_with_name (_("Couldn't write registers"));
      }
  
    if (regnum == -1 || getfpregs_supplies (regnum))
      {
        struct fpreg fpregs;
  
        if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  	perror_with_name (_("Couldn't get floating point status"));
  
        regcache->collect_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
  				sizeof (fpregs));
  
        if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  	perror_with_name (_("Couldn't write floating point status"));
      }
  }
  
  void _initialize_riscv_fbsd_nat ();
  void
  _initialize_riscv_fbsd_nat ()
  {
    add_inf_child_target (&the_riscv_fbsd_nat_target);
  }
  