text: /* Native-dependent code for GNU/Linux m32r.
  
     Copyright (C) 2004-2014 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 "gdbcore.h"
  #include "regcache.h"
  #include "linux-nat.h"
  #include "target.h"
  
  #include "gdb_assert.h"
  #include <string.h>
  #include <sys/ptrace.h>
  #include <sys/user.h>
  #include <sys/procfs.h>
  
  /* Prototypes for supply_gregset etc.  */
  #include "gregset.h"
  
  #include "m32r-tdep.h"
  
  
  
  
  /* Since EVB register is not available for native debug, we reduce
     the number of registers.  */
  #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
  
  /* Mapping between the general-purpose registers in `struct user'
     format and GDB's register array layout.  */
  static int regmap[] = {
    4, 5, 6, 7, 0, 1, 2, 8,
    9, 10, 11, 12, 13, 24, 25, 23,
    19, 19, 26, 23, 22, 20, 16, 15
  };
  
  #define PSW_REGMAP 19
  #define BBPSW_REGMAP 21
  #define SPU_REGMAP 23
  #define SPI_REGMAP 26
  
  /* Doee (??) apply to the corresponding SET requests as well.  */
  #define GETREGS_SUPPLIES(regno) (0 <= (regno) \
  				 && (regno) <= M32R_LINUX_NUM_REGS)
  
  
  
  /* Transfering the general-purpose registers between GDB, inferiors
     and core files.  */
  
  /* Fill GDB's register array with the general-purpose register values
     in *GREGSETP.  */
  
  void
  supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp)
  {
    const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
    int i;
    unsigned long psw, bbpsw;
  
    psw = *(regp + PSW_REGMAP);
    bbpsw = *(regp + BBPSW_REGMAP);
  
    for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
      {
        elf_greg_t regval;
  
        switch (i)
  	{
  	case PSW_REGNUM:
  	  regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);
  	  break;
  	case CBR_REGNUM:
  	  regval = ((psw >> 8) & 1);
  	  break;
  	default:
  	  regval = *(regp + regmap[i]);
  	  break;
  	}
  
        if (i != M32R_SP_REGNUM)
  	regcache_raw_supply (regcache, i, &regval);
        else if (psw & 0x8000)
  	regcache_raw_supply (regcache, i, regp + SPU_REGMAP);
        else
  	regcache_raw_supply (regcache, i, regp + SPI_REGMAP);
      }
  }
  
  /* Fetch all general-purpose registers from process/thread TID and
     store their values in GDB's register array.  */
  
  static void
  fetch_regs (struct regcache *regcache, int tid)
  {
    elf_gregset_t regs;
  
    if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
      perror_with_name (_("Couldn't get registers"));
  
    supply_gregset (regcache, (const elf_gregset_t *) &regs);
  }
  
  /* Fill register REGNO (if it is a general-purpose register) in
     *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
     do this for all registers.  */
  
  void
  fill_gregset (const struct regcache *regcache,
  	      elf_gregset_t * gregsetp, int regno)
  {
    elf_greg_t *regp = (elf_greg_t *) gregsetp;
    int i;
    unsigned long psw, bbpsw, tmp;
  
    psw = *(regp + PSW_REGMAP);
    bbpsw = *(regp + BBPSW_REGMAP);
  
    for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
      {
        if (regno != -1 && regno != i)
  	continue;
  
        if (i == CBR_REGNUM || i == PSW_REGNUM)
  	continue;
  
        if (i == SPU_REGNUM || i == SPI_REGNUM)
  	continue;
  
        if (i != M32R_SP_REGNUM)
  	regcache_raw_collect (regcache, i, regp + regmap[i]);
        else if (psw & 0x8000)
  	regcache_raw_collect (regcache, i, regp + SPU_REGMAP);
        else
  	regcache_raw_collect (regcache, i, regp + SPI_REGMAP);
      }
  }
  
  /* Store all valid general-purpose registers in GDB's register array
     into the process/thread specified by TID.  */
  
  static void
  store_regs (const struct regcache *regcache, int tid, int regno)
  {
    elf_gregset_t regs;
  
    if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
      perror_with_name (_("Couldn't get registers"));
  
    fill_gregset (regcache, &regs, regno);
  
    if (ptrace (PTRACE_SETREGS, tid, 0, (int) &regs) < 0)
      perror_with_name (_("Couldn't write registers"));
  }
  
  
  
  /* Transfering floating-point registers between GDB, inferiors and cores.  
     Since M32R has no floating-point registers, these functions do nothing.  */
  
  void
  supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
  {
  }
  
  void
  fill_fpregset (const struct regcache *regcache,
  	       gdb_fpregset_t *fpregs, int regno)
  {
  }
  
  
  
  /* Transferring arbitrary registers between GDB and inferior.  */
  
  /* Fetch register REGNO from the child process.  If REGNO is -1, do
     this for all registers (including the floating point and SSE
     registers).  */
  
  static void
  m32r_linux_fetch_inferior_registers (struct target_ops *ops,
  				     struct regcache *regcache, int regno)
  {
    int tid;
  
    /* GNU/Linux LWP ID's are process ID's.  */
    tid = ptid_get_lwp (inferior_ptid);
    if (tid == 0)
      tid = ptid_get_pid (inferior_ptid);	/* Not a threaded program.  */
  
    /* Use the PTRACE_GETREGS request whenever possible, since it
       transfers more registers in one system call, and we'll cache the
       results.  */
    if (regno == -1 || GETREGS_SUPPLIES (regno))
      {
        fetch_regs (regcache, tid);
        return;
      }
  
    internal_error (__FILE__, __LINE__,
  		  _("Got request for bad register number %d."), regno);
  }
  
  /* Store register REGNO back into the child process.  If REGNO is -1,
     do this for all registers (including the floating point and SSE
     registers).  */
  static void
  m32r_linux_store_inferior_registers (struct target_ops *ops,
  				     struct regcache *regcache, int regno)
  {
    int tid;
  
    /* GNU/Linux LWP ID's are process ID's.  */
    if ((tid = ptid_get_lwp (inferior_ptid)) == 0)
      tid = ptid_get_pid (inferior_ptid);	/* Not a threaded program.  */
  
    /* Use the PTRACE_SETREGS request whenever possible, since it
       transfers more registers in one system call.  */
    if (regno == -1 || GETREGS_SUPPLIES (regno))
      {
        store_regs (regcache, tid, regno);
        return;
      }
  
    internal_error (__FILE__, __LINE__,
  		  _("Got request to store bad register number %d."), regno);
  }
  
  void _initialize_m32r_linux_nat (void);
  
  void
  _initialize_m32r_linux_nat (void)
  {
    struct target_ops *t;
  
    /* Fill in the generic GNU/Linux methods.  */
    t = linux_target ();
  
    /* Add our register access methods.  */
    t->to_fetch_registers = m32r_linux_fetch_inferior_registers;
    t->to_store_registers = m32r_linux_store_inferior_registers;
  
    /* Register the target.  */
    linux_nat_add_target (t);
  }
  