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/* Native-dependent code for modern i386 BSD's.

   Copyright 2000, 2001, 2002 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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "inferior.h"

#include "regcache.h"

#include "gdb_assert.h"

#include <signal.h>

#include <stddef.h>

#include <sys/types.h>

#include <sys/ptrace.h>

#include <machine/reg.h>

#include <machine/frame.h>

#ifdef HAVE_SYS_PROCFS_H

#include <sys/procfs.h>

#endif

#ifndef HAVE_GREGSET_T

typedef struct reg gregset_t;

#endif

#ifndef HAVE_FPREGSET_T

typedef struct fpreg fpregset_t;

#endif

#include "gregset.h"

#include "i386-tdep.h"

/* In older BSD versions we cannot get at some of the segment

   registers.  FreeBSD for example didn't support the %fs and %gs

   registers until the 3.0 release.  We have autoconf checks for their

   presence, and deal gracefully with their absence.  */

/* Registers we shouldn't try to fetch.  */

#if !defined (CANNOT_FETCH_REGISTER)

#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)

#endif

/* Registers we shouldn't try to store.  */

#if !defined (CANNOT_STORE_REGISTER)

#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)

#endif

/* Offset to the gregset_t location where REG is stored.  */

#define REG_OFFSET(reg) offsetof (gregset_t, reg)

/* At reg_offset[REGNO] you'll find the offset to the gregset_t

   location where the GDB register REGNO is stored.  Unsupported

   registers are marked with `-1'.  */

static int reg_offset[] =

{

  REG_OFFSET (r_eax),

  REG_OFFSET (r_ecx),

  REG_OFFSET (r_edx),

  REG_OFFSET (r_ebx),

  REG_OFFSET (r_esp),

  REG_OFFSET (r_ebp),

  REG_OFFSET (r_esi),

  REG_OFFSET (r_edi),

  REG_OFFSET (r_eip),

  REG_OFFSET (r_eflags),

  REG_OFFSET (r_cs),

  REG_OFFSET (r_ss),

  REG_OFFSET (r_ds),

  REG_OFFSET (r_es),

#ifdef HAVE_STRUCT_REG_R_FS

  REG_OFFSET (r_fs),

#else

  -1,

#endif

#ifdef HAVE_STRUCT_REG_R_GS

  REG_OFFSET (r_gs)

#else

  -1

#endif

};

#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])

/* Macro to determine if a register is fetched with PT_GETREGS.  */

#define GETREGS_SUPPLIES(regno) \

  ((0 <= (regno) && (regno) <= 15))

#ifdef HAVE_PT_GETXMMREGS

/* Set to 1 if the kernel supports PT_GETXMMREGS.  Initialized to -1

   so that we try PT_GETXMMREGS the first time around.  */

static int have_ptrace_xmmregs = -1;

#endif

/* Return nonzero if we shouldn't try to fetch register REGNO.  */

static int

cannot_fetch_register (int regno)

{

  return (reg_offset[regno] == -1);

}

/* Transfering the registers between GDB, inferiors and core files.  */

/* Fill GDB's register array with the general-purpose register values

   in *GREGSETP.  */

void

supply_gregset (gregset_t *gregsetp)

{

  int i;

  for (i = 0; i < I386_NUM_GREGS; i++)

    {

      if (CANNOT_FETCH_REGISTER (i))

        supply_register (i, NULL);

      else

        supply_register (i, REG_ADDR (gregsetp, i));

    }

}

/* 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 (gregset_t *gregsetp, int regno)

{

  int i;

  for (i = 0; i < I386_NUM_GREGS; i++)

    if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))

      regcache_collect (i, REG_ADDR (gregsetp, i));

}

#include "i387-tdep.h"

/* Fill GDB's register array with the floating-point register values

   in *FPREGSETP.  */

void

supply_fpregset (fpregset_t *fpregsetp)

{

  i387_supply_fsave ((char *) fpregsetp);

}

/* Fill register REGNO (if it is a floating-point register) in

   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,

   do this for all registers.  */

void

fill_fpregset (fpregset_t *fpregsetp, int regno)

{

  i387_fill_fsave ((char *) fpregsetp, regno);

}

/* Fetch register REGNO from the inferior.  If REGNO is -1, do this

   for all registers (including the floating point registers).  */

void

fetch_inferior_registers (int regno)

{

  if (regno == -1 || GETREGS_SUPPLIES (regno))

    {

      gregset_t gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &gregs, 0) == -1)

        perror_with_name ("Couldn't get registers");

      supply_gregset (&gregs);

      if (regno != -1)

        return;

    }

  if (regno == -1 || regno >= FP0_REGNUM)

    {

      fpregset_t fpregs;

#ifdef HAVE_PT_GETXMMREGS

      char xmmregs[512];

      if (have_ptrace_xmmregs != 0 &&

          ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),

                 (PTRACE_ARG3_TYPE) xmmregs, 0) == 0)

        {

          have_ptrace_xmmregs = 1;

          i387_supply_fxsave (xmmregs);

        }

      else

        {

          if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)

            perror_with_name ("Couldn't get floating point status");

          supply_fpregset (&fpregs);

        }

#else

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)

        perror_with_name ("Couldn't get floating point status");

      supply_fpregset (&fpregs);

#endif

    }

}

/* Store register REGNO back into the inferior.  If REGNO is -1, do

   this for all registers (including the floating point registers).  */

void

store_inferior_registers (int regno)

{

  if (regno == -1 || GETREGS_SUPPLIES (regno))

    {

      gregset_t gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &gregs, 0) == -1)

        perror_with_name ("Couldn't get registers");

      fill_gregset (&gregs, regno);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),

                  (PTRACE_ARG3_TYPE) &gregs, 0) == -1)

        perror_with_name ("Couldn't write registers");

      if (regno != -1)

        return;

    }

  if (regno == -1 || regno >= FP0_REGNUM)

    {

      fpregset_t fpregs;

#ifdef HAVE_PT_GETXMMREGS

      char xmmregs[512];

      if (have_ptrace_xmmregs != 0 &&

          ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),

                 (PTRACE_ARG3_TYPE) xmmregs, 0) == 0)

        {

          have_ptrace_xmmregs = 1;

          i387_fill_fxsave (xmmregs, regno);

          if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),

                      (PTRACE_ARG3_TYPE) xmmregs, 0) == -1)

            perror_with_name ("Couldn't write XMM registers");

        }

      else

        {

          have_ptrace_xmmregs = 0;

#endif

          if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)

            perror_with_name ("Couldn't get floating point status");

          fill_fpregset (&fpregs, regno);

          if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),

                      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)

            perror_with_name ("Couldn't write floating point status");

#ifdef HAVE_PT_GETXMMREGS

        }

#endif

    }

}

/* Support for debug registers.  */

#ifdef HAVE_PT_GETDBREGS

/* Not all versions of FreeBSD/i386 that support the debug registers

   have this macro.  */

#ifndef DBREG_DRX

#define DBREG_DRX(d, x) ((&d->dr0)[x])

#endif

static void

i386bsd_dr_set (int regnum, unsigned int value)

{

  struct dbreg dbregs;

  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),

              (PTRACE_ARG3_TYPE) &dbregs, 0) == -1)

    perror_with_name ("Couldn't get debug registers");

  /* For some mysterious reason, some of the reserved bits in the

     debug control register get set.  Mask these off, otherwise the

     ptrace call below will fail.  */

  dbregs.dr7 &= ~(0x0000fc00);

  DBREG_DRX ((&dbregs), regnum) = value;

  if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),

              (PTRACE_ARG3_TYPE) &dbregs, 0) == -1)

    perror_with_name ("Couldn't write debug registers");

}

void

i386bsd_dr_set_control (unsigned long control)

{

  i386bsd_dr_set (7, control);

}

void

i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)

{

  gdb_assert (regnum >= 0 && regnum <= 4);

  i386bsd_dr_set (regnum, addr);

}

void

i386bsd_dr_reset_addr (int regnum)

{

  gdb_assert (regnum >= 0 && regnum <= 4);

  i386bsd_dr_set (regnum, 0);

}

unsigned long

i386bsd_dr_get_status (void)

{

  struct dbreg dbregs;

  /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the

     ptrace call fails breaks debugging remote targets.  The correct

     way to fix this is to add the hardware breakpoint and watchpoint

     stuff to the target vector.  For now, just return zero if the

     ptrace call fails.  */

  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),

              (PTRACE_ARG3_TYPE) & dbregs, 0) == -1)

#if 0

    perror_with_name ("Couldn't read debug registers");

#else

    return 0;

#endif

  return dbregs.dr6;

}

#endif /* PT_GETDBREGS */

/* Support for the user struct.  */

/* Return the address register REGNO.  BLOCKEND is the value of

   u.u_ar0, which should point to the registers.  */

CORE_ADDR

register_u_addr (CORE_ADDR blockend, int regno)

{

  return (CORE_ADDR) REG_ADDR (blockend, regno);

}

#include <sys/param.h>

#include <sys/user.h>

/* Return the size of the user struct.  */

int

kernel_u_size (void)

{

  return (sizeof (struct user));

}

void

_initialize_i386bsd_nat (void)

{

  int sc_pc_offset;

  int sc_sp_offset;

  /* To support the recognition of signal handlers, i386bsd-tdep.c

     hardcodes some constants.  Inclusion of this file means that we

     are compiling a native debugger, which means that we can use the

     system header files and sysctl(3) to get at the relevant

     information.  */

#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011

  extern int i386fbsd4_sc_pc_offset;

  extern int i386fbsd4_sc_sp_offset;

#define SC_PC_OFFSET i386fbsd4_sc_pc_offset

#define SC_SP_OFFSET i386fbsd4_sc_sp_offset

#elif defined (NetBSD) || defined (__NetBSD_Version__)

  extern int i386nbsd_sc_pc_offset;

  extern int i386nbsd_sc_sp_offset;

#define SC_PC_OFFSET i386nbsd_sc_pc_offset

#define SC_SP_OFFSET i386nbsd_sc_sp_offset

#elif defined (OpenBSD)

  extern int i386obsd_sc_pc_offset;

  extern int i386obsd_sc_sp_offset;

#define SC_PC_OFFSET i386obsd_sc_pc_offset

#define SC_SP_OFFSET i386obsd_sc_sp_offset

#else

  extern int i386bsd_sc_pc_offset;

  extern int i386bsd_sc_sp_offset;

#define SC_PC_OFFSET i386bsd_sc_pc_offset

#define SC_SP_OFFSET i386bsd_sc_sp_offset

#endif

  /* Override the default value for the offset of the program counter

     in the sigcontext structure.  */

  sc_pc_offset = offsetof (struct sigcontext, sc_pc);

  if (SC_PC_OFFSET != sc_pc_offset)

    {

      warning ("\

offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\

Please report this to <bug-gdb@gnu.org>.",

               sc_pc_offset, SC_PC_OFFSET);

    }

  SC_PC_OFFSET = sc_pc_offset;

  /* Likewise for the stack pointer.  */

  sc_sp_offset = offsetof (struct sigcontext, sc_sp);

  if (SC_SP_OFFSET != sc_sp_offset)

    {

      warning ("\

offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\

Please report this to <bug-gdb@gnu.org>.",

               sc_sp_offset, SC_SP_OFFSET);

    }

  SC_SP_OFFSET = sc_sp_offset;

}