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/* Low level interface to I386 running mach 3.0.

   Copyright 1992, 1993, 1994, 1996, 2000, 2001

   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 "floatformat.h"

#include "regcache.h"

#include <stdio.h>

#include <mach.h>

#include <mach/message.h>

#include <mach/exception.h>

#include <mach_error.h>

/* Hmmm... Should this not be here?

 * Now for i386_float_info() target_has_execution

 */

#include <target.h>

/* This mess is duplicated in bfd/i386mach3.h

 * This is an ugly way to hack around the incorrect

 * definition of UPAGES in i386/machparam.h.

 *

 * The definition should specify the size reserved

 * for "struct user" in core files in PAGES,

 * but instead it gives it in 512-byte core-clicks

 * for i386 and i860.

 */

#include <sys/param.h>

#if UPAGES == 16

#define UAREA_SIZE ctob(UPAGES)

#elif UPAGES == 2

#define UAREA_SIZE (NBPG*UPAGES)

#else

FIXME ! !UPAGES is neither 2 nor 16

#endif

/* @@@ Should move print_387_status() to i387-tdep.c */

extern void print_387_control_word ();          /* i387-tdep.h */

extern void print_387_status_word ();

#define private static

/* Find offsets to thread states at compile time.

 * If your compiler does not grok this, calculate offsets

 * offsets yourself and use them (or get a compatible compiler :-)

 */

#define  REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)

/* at reg_offset[i] is the offset to the i386_thread_state

 * location where the gdb registers[i] is stored.

 */

static int reg_offset[] =

{

  REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx),

  REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi),

  REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss),

  REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs)

};

#define REG_ADDRESS(state,regnum) ((char *)(state)+reg_offset[regnum])

/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM

 * Caller knows that the regs handled in one transaction are of same size.

 */

#define FETCH_REGS(state, regnum, count) \

  memcpy (&registers[REGISTER_BYTE (regnum)], \

          REG_ADDRESS (state, regnum), \

          count*REGISTER_SIZE)

/* Store COUNT contiguous registers to thread STATE starting from REGNUM */

#define STORE_REGS(state, regnum, count) \

  memcpy (REG_ADDRESS (state, regnum), \

          &registers[REGISTER_BYTE (regnum)], \

          count*REGISTER_SIZE)

/*

 * Fetch inferiors registers for gdb.

 * REGNO specifies which (as gdb views it) register, -1 for all.

 */

void

fetch_inferior_registers (int regno)

{

  kern_return_t ret;

  thread_state_data_t state;

  unsigned int stateCnt = i386_THREAD_STATE_COUNT;

  int index;

  if (!MACH_PORT_VALID (current_thread))

    error ("fetch inferior registers: Invalid thread");

  if (must_suspend_thread)

    setup_thread (current_thread, 1);

  ret = thread_get_state (current_thread,

                          i386_THREAD_STATE,

                          state,

                          &stateCnt);

  if (ret != KERN_SUCCESS)

    warning ("fetch_inferior_registers: %s ",

             mach_error_string (ret));

#if 0

  /* It may be more effective to store validate all of them,

   * since we fetched them all anyway

   */

  else if (regno != -1)

    supply_register (regno, (char *) state + reg_offset[regno]);

#endif

  else

    {

      for (index = 0; index < NUM_REGS; index++)

        supply_register (index, (char *) state + reg_offset[index]);

    }

  if (must_suspend_thread)

    setup_thread (current_thread, 0);

}

/* Store our register values back into the inferior.

 * If REGNO is -1, do this for all registers.

 * Otherwise, REGNO specifies which register

 *

 * On mach3 all registers are always saved in one call.

 */

void

store_inferior_registers (int regno)

{

  kern_return_t ret;

  thread_state_data_t state;

  unsigned int stateCnt = i386_THREAD_STATE_COUNT;

  register int index;

  if (!MACH_PORT_VALID (current_thread))

    error ("store inferior registers: Invalid thread");

  if (must_suspend_thread)

    setup_thread (current_thread, 1);

  /* Fetch the state of the current thread */

  ret = thread_get_state (current_thread,

                          i386_THREAD_STATE,

                          state,

                          &stateCnt);

  if (ret != KERN_SUCCESS)

    {

      warning ("store_inferior_registers (get): %s",

               mach_error_string (ret));

      if (must_suspend_thread)

        setup_thread (current_thread, 0);

      return;

    }

  /* move gdb's registers to thread's state

   * Since we save all registers anyway, save the ones

   * that gdb thinks are valid (e.g. ignore the regno

   * parameter)

   */

#if 0

  if (regno != -1)

    STORE_REGS (state, regno, 1);

  else

#endif

    {

      for (index = 0; index < NUM_REGS; index++)

        STORE_REGS (state, index, 1);

    }

  /* Write gdb's current view of register to the thread

   */

  ret = thread_set_state (current_thread,

                          i386_THREAD_STATE,

                          state,

                          i386_THREAD_STATE_COUNT);

  if (ret != KERN_SUCCESS)

    warning ("store_inferior_registers (set): %s",

             mach_error_string (ret));

  if (must_suspend_thread)

    setup_thread (current_thread, 0);

}

/* Return the address in the core dump or inferior of register REGNO.

 * BLOCKEND should be the address of the end of the UPAGES area read

 * in memory, but it's not?

 *

 * Currently our UX server dumps the whole thread state to the

 * core file. If your UX does something else, adapt the routine

 * below to return the offset to the given register.

 *

 * Called by core-aout.c(fetch_core_registers)

 */

CORE_ADDR

register_addr (int regno, CORE_ADDR blockend)

{

  CORE_ADDR addr;

  if (regno < 0 || regno >= NUM_REGS)

    error ("Invalid register number %d.", regno);

  /* UAREA_SIZE == 8 kB in i386 */

  addr = (unsigned int) REG_ADDRESS (UAREA_SIZE - sizeof (struct i386_thread_state), regno);

  return addr;

}

/* jtv@hut.fi: I copied and modified this 387 code from

 * gdb/i386-xdep.c. Modifications for Mach 3.0.

 *

 * i387 status dumper. See also i387-tdep.c

 */

struct env387

{

  unsigned short control;

  unsigned short r0;

  unsigned short status;

  unsigned short r1;

  unsigned short tag;

  unsigned short r2;

  unsigned long eip;

  unsigned short code_seg;

  unsigned short opcode;

  unsigned long operand;

  unsigned short operand_seg;

  unsigned short r3;

  unsigned char regs[8][10];

};

/* This routine is machine independent?

 * Should move it to i387-tdep.c but you need to export struct env387

 */

private

print_387_status (unsigned short status, struct env387 *ep)

{

  int i;

  int bothstatus;

  int top;

  int fpreg;

  unsigned char *p;

  bothstatus = ((status != 0) && (ep->status != 0));

  if (status != 0)

    {

      if (bothstatus)

        printf_unfiltered ("u: ");

      print_387_status_word (status);

    }

  if (ep->status != 0)

    {

      if (bothstatus)

        printf_unfiltered ("e: ");

      print_387_status_word (ep->status);

    }

  print_387_control_word (ep->control);

  printf_unfiltered ("last exception: ");

  printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));

  printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));

  printf_unfiltered ("%s; ", local_hex_string (ep->eip));

  printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));

  printf_unfiltered (":%s\n", local_hex_string (ep->operand));

  top = (ep->status >> 11) & 7;

  printf_unfiltered ("regno  tag  msb              lsb  value\n");

  for (fpreg = 7; fpreg >= 0; fpreg--)

    {

      double val;

      printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);

      switch ((ep->tag >> (fpreg * 2)) & 3)

        {

        case 0:

          printf_unfiltered ("valid ");

          break;

        case 1:

          printf_unfiltered ("zero  ");

          break;

        case 2:

          printf_unfiltered ("trap  ");

          break;

        case 3:

          printf_unfiltered ("empty ");

          break;

        }

      for (i = 9; i >= 0; i--)

        printf_unfiltered ("%02x", ep->regs[fpreg][i]);

      floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],

                             &val);

      printf_unfiltered ("  %g\n", val);

    }

  if (ep->r0)

    printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string (ep->r0));

  if (ep->r1)

    printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string (ep->r1));

  if (ep->r2)

    printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string (ep->r2));

  if (ep->r3)

    printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string (ep->r3));

}

/*

 * values that go into fp_kind (from <i386/fpreg.h>)

 */

#define FP_NO   0               /* no fp chip, no emulator (no fp support)      */

#define FP_SW   1               /* no fp chip, using software emulator          */

#define FP_HW   2               /* chip present bit                             */

#define FP_287  2               /* 80287 chip present                           */

#define FP_387  3               /* 80387 chip present                           */

typedef struct fpstate

{

#if 1

  unsigned char state[FP_STATE_BYTES];  /* "hardware" state */

#else

  struct env387 state;          /* Actually this */

#endif

  int status;                   /* Duplicate status */

}

 *fpstate_t;

/* Mach 3 specific routines.

 */

private boolean_t

get_i387_state (struct fpstate *fstate)

{

  kern_return_t ret;

  thread_state_data_t state;

  unsigned int fsCnt = i386_FLOAT_STATE_COUNT;

  struct i386_float_state *fsp;

  ret = thread_get_state (current_thread,

                          i386_FLOAT_STATE,

                          state,

                          &fsCnt);

  if (ret != KERN_SUCCESS)

    {

      warning ("Can not get live floating point state: %s",

               mach_error_string (ret));

      return FALSE;

    }

  fsp = (struct i386_float_state *) state;

  /* The 387 chip (also 486 counts) or a software emulator? */

  if (!fsp->initialized || (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))

    return FALSE;

  /* Clear the target then copy thread's float state there.

     Make a copy of the status word, for some reason?

   */

  memset (fstate, 0, sizeof (struct fpstate));

  fstate->status = fsp->exc_status;

  memcpy (fstate->state, (char *) &fsp->hw_state, FP_STATE_BYTES);

  return TRUE;

}

private boolean_t

get_i387_core_state (struct fpstate *fstate)

{

  /* Not implemented yet. Core files do not contain float state. */

  return FALSE;

}

/*

 * This is called by "info float" command

 */

void

i386_mach3_float_info (void)

{

  char buf[sizeof (struct fpstate) + 2 * sizeof (int)];

  boolean_t valid = FALSE;

  fpstate_t fps;

  if (target_has_execution)

    valid = get_i387_state (buf);

#if 0

  else if (WE HAVE CORE FILE)   /* @@@@ Core files not supported */

    valid = get_i387_core_state (buf);

#endif

  if (!valid)

    {

      warning ("no floating point status saved");

      return;

    }

  fps = (fpstate_t) buf;

  print_387_status (fps->status, (struct env387 *) fps->state);

}