[binutils.git] / gdb / i386m3-nat.c

/* Low level interface to I386 running mach 3.0.
   Copyright (C) 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "inferior.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

\f
/* 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)
\f
/*
 * Fetch inferiors registers for gdb.
 * REGNO specifies which (as gdb views it) register, -1 for all.
 */

void
fetch_inferior_registers (regno)
     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)
    message ("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);
}
\f
/* 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 (regno)
     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) 
    {
      message ("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)
    message ("store_inferior_registers (set): %s",
	     mach_error_string (ret));

  if (must_suspend_thread)
    setup_thread (current_thread, 0);
}

\f

/* 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 coredep.c(fetch_core_registers)
 */

unsigned int
register_addr (regno, blockend)
     int regno;
     int blockend;
{
  unsigned int 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;
}

/* [email protected]: 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 (status, ep)
     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 (fstate)
     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)
    {
      message ("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?
   */
  bzero (fstate, 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 (fstate)
     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()
{
  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) 
    {
      message("no floating point status saved");
      return;
    }
  
  fps = (fpstate_t) buf;

  print_387_status (fps->status, (struct env387 *)fps->state);
}
Commit	Line	Data
c2d751d5 JK	1	/* Low level interface to I386 running mach 3.0.
	2	Copyright (C) 1992 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
	20	#include "defs.h"
	21	#include "inferior.h"
	22
	23	#include <stdio.h>
	24
	25	#include <mach.h>
	26	#include <mach/message.h>
	27	#include <mach/exception.h>
	28	#include <mach_error.h>
	29
	30	/* Hmmm... Should this not be here?
	31	* Now for i386_float_info() target_has_execution
	32	*/
	33	#include <target.h>
	34
	35	/* This mess is duplicated in bfd/i386mach3.h
	36	*
	37	* This is an ugly way to hack around the incorrect
	38	* definition of UPAGES in i386/machparam.h.
	39	*
	40	* The definition should specify the size reserved
	41	* for "struct user" in core files in PAGES,
	42	* but instead it gives it in 512-byte core-clicks
	43	* for i386 and i860.
	44	*/
	45	#include <sys/param.h>
	46	#if UPAGES == 16
	47	#define UAREA_SIZE ctob(UPAGES)
	48	#elif UPAGES == 2
	49	#define UAREA_SIZE (NBPG*UPAGES)
	50	#else
	51	FIXME!! UPAGES is neither 2 nor 16
	52	#endif
	53
	54	/* @@@ Should move print_387_status() to i387-tdep.c */
	55	extern void print_387_control_word (); /* i387-tdep.h */
	56	extern void print_387_status_word ();
	57
c2d751d5 JK	58	#define private static
	59
	60	\f
	61	/* Find offsets to thread states at compile time.
	62	* If your compiler does not grok this, calculate offsets
	63	* offsets yourself and use them (or get a compatible compiler :-)
	64	*/
	65
	66	#define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)
	67
	68	/* at reg_offset[i] is the offset to the i386_thread_state
	69	* location where the gdb registers[i] is stored.
	70	*/
	71
	72	static int reg_offset[] =
	73	{
	74	REG_OFFSET(eax), REG_OFFSET(ecx), REG_OFFSET(edx), REG_OFFSET(ebx),
	75	REG_OFFSET(uesp), REG_OFFSET(ebp), REG_OFFSET(esi), REG_OFFSET(edi),
	76	REG_OFFSET(eip), REG_OFFSET(efl), REG_OFFSET(cs), REG_OFFSET(ss),
	77	REG_OFFSET(ds), REG_OFFSET(es), REG_OFFSET(fs), REG_OFFSET(gs)
	78	};
	79
	80	#define REG_ADDRESS(state,regnum) ((char *)(state)+reg_offset[regnum])
	81
	82	/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
	83	* Caller knows that the regs handled in one transaction are of same size.
	84	*/
	85	#define FETCH_REGS(state, regnum, count) \
a6e0dae9 JK	86	memcpy (&registers[REGISTER_BYTE (regnum)], \
a6e0dae9 JK	87	REG_ADDRESS (state, regnum), \
f4f0d174	88	count*REGISTER_SIZE)
c2d751d5 JK	89
	90	/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
	91	#define STORE_REGS(state, regnum, count) \
a6e0dae9 JK	92	memcpy (REG_ADDRESS (state, regnum), \
a6e0dae9 JK	93	&registers[REGISTER_BYTE (regnum)], \
f4f0d174	94	count*REGISTER_SIZE)
c2d751d5 JK	95	\f
	96	/*
	97	* Fetch inferiors registers for gdb.
	98	* REGNO specifies which (as gdb views it) register, -1 for all.
	99	*/
	100
	101	void
	102	fetch_inferior_registers (regno)
	103	int regno;
	104	{
	105	kern_return_t ret;
	106	thread_state_data_t state;
	107	unsigned int stateCnt = i386_THREAD_STATE_COUNT;
	108	int index;
	109
	110	if (! MACH_PORT_VALID (current_thread))
	111	error ("fetch inferior registers: Invalid thread");
	112
	113	if (must_suspend_thread)
	114	setup_thread (current_thread, 1);
	115
	116	ret = thread_get_state (current_thread,
	117	i386_THREAD_STATE,
	118	state,
	119	&stateCnt);
	120
	121	if (ret != KERN_SUCCESS)
	122	message ("fetch_inferior_registers: %s ",
	123	mach_error_string (ret));
	124	#if 0
	125	/* It may be more effective to store validate all of them,
	126	* since we fetched them all anyway
	127	*/
	128	else if (regno != -1)
	129	supply_register (regno, (char *)state+reg_offset[regno]);
	130	#endif
	131	else
	132	{
	133	for (index = 0; index < NUM_REGS; index++)
	134	supply_register (index, (char *)state+reg_offset[index]);
	135	}
	136
	137	if (must_suspend_thread)
	138	setup_thread (current_thread, 0);
	139	}
	140	\f
	141	/* Store our register values back into the inferior.
	142	* If REGNO is -1, do this for all registers.
	143	* Otherwise, REGNO specifies which register
	144	*
	145	* On mach3 all registers are always saved in one call.
	146	*/
	147	void
	148	store_inferior_registers (regno)
	149	int regno;
	150	{
	151	kern_return_t ret;
	152	thread_state_data_t state;
	153	unsigned int stateCnt = i386_THREAD_STATE_COUNT;
	154	register int index;
	155
	156	if (! MACH_PORT_VALID (current_thread))
	157	error ("store inferior registers: Invalid thread");
	158
159	if (must_suspend_thread)
160	setup_thread (current_thread, 1);
161
162	/* Fetch the state of the current thread */
163	ret = thread_get_state (current_thread,
164	i386_THREAD_STATE,
165	state,
166	&stateCnt);
167
168	if (ret != KERN_SUCCESS)
169	{
170	message ("store_inferior_registers (get): %s",
171	mach_error_string (ret));
172	if (must_suspend_thread)
173	setup_thread (current_thread, 0);
174	return;
175	}
176
177	/* move gdb's registers to thread's state
178	*
179	* Since we save all registers anyway, save the ones
180	* that gdb thinks are valid (e.g. ignore the regno
181	* parameter)
182	*/
183	#if 0
184	if (regno != -1)
185	STORE_REGS (state, regno, 1);
186	else
187	#endif
188	{
189	for (index = 0; index < NUM_REGS; index++)
190	STORE_REGS (state, index, 1);
191	}
192
193	/* Write gdb's current view of register to the thread
194	*/
195	ret = thread_set_state (current_thread,
196	i386_THREAD_STATE,
197	state,
198	i386_THREAD_STATE_COUNT);
199
200	if (ret != KERN_SUCCESS)
201	message ("store_inferior_registers (set): %s",
202	mach_error_string (ret));
203
204	if (must_suspend_thread)
205	setup_thread (current_thread, 0);
206	}
207
208	\f
209
210	/* Return the address in the core dump or inferior of register REGNO.
211	* BLOCKEND should be the address of the end of the UPAGES area read
212	* in memory, but it's not?
213	*
214	* Currently our UX server dumps the whole thread state to the
215	* core file. If your UX does something else, adapt the routine
216	* below to return the offset to the given register.
217	*
218	* Called by coredep.c(fetch_core_registers)
219	*/
220
221	unsigned int
222	register_addr (regno, blockend)
223	int regno;
224	int blockend;
225	{
226	unsigned int addr;
227
228	if (regno < 0 \|\| regno >= NUM_REGS)
229	error ("Invalid register number %d.", regno);
230
231	/* UAREA_SIZE == 8 kB in i386 */
232	addr = (unsigned int)REG_ADDRESS (UAREA_SIZE - sizeof(struct i386_thread_state), regno);
233
234	return addr;
235	}
236
237	/* [email protected]: I copied and modified this 387 code from
238	* gdb/i386-xdep.c. Modifications for Mach 3.0.
239	*
240	* i387 status dumper. See also i387-tdep.c
241	*/
242	struct env387
243	{
244	unsigned short control;
245	unsigned short r0;
246	unsigned short status;
247	unsigned short r1;
248	unsigned short tag;
249	unsigned short r2;
250	unsigned long eip;
251	unsigned short code_seg;
252	unsigned short opcode;
253	unsigned long operand;
254	unsigned short operand_seg;
255	unsigned short r3;
256	unsigned char regs[8][10];
257	};
258	/* This routine is machine independent?
259	* Should move it to i387-tdep.c but you need to export struct env387
260	*/
261	private
262	print_387_status (status, ep)
263	unsigned short status;
264	struct env387 *ep;
265	{
266	int i;
267	int bothstatus;
268	int top;
269	int fpreg;
270	unsigned char *p;
271
272	bothstatus = ((status != 0) && (ep->status != 0));
273	if (status != 0)
274	{
275	if (bothstatus)
199b2450	276	printf_unfiltered ("u: ");
c2d751d5 JK	277	print_387_status_word (status);
	278	}
	279
	280	if (ep->status != 0)
	281	{
	282	if (bothstatus)
199b2450	283	printf_unfiltered ("e: ");
c2d751d5 JK	284	print_387_status_word (ep->status);
	285	}
	286
	287	print_387_control_word (ep->control);
199b2450 TL	288	printf_unfiltered ("last exception: ");
	289	printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
	290	printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
	291	printf_unfiltered ("%s; ", local_hex_string(ep->eip));
	292	printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
	293	printf_unfiltered (":%s\n", local_hex_string(ep->operand));
c2d751d5 JK	294
	295	top = (ep->status >> 11) & 7;
	296
199b2450	297	printf_unfiltered ("regno tag msb lsb value\n");
c2d751d5 JK	298	for (fpreg = 7; fpreg >= 0; fpreg--)
	299	{
	300	double val;
	301
199b2450	302	printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
c2d751d5 JK	303
	304	switch ((ep->tag >> (fpreg * 2)) & 3)
	305	{
199b2450 TL	306	case 0: printf_unfiltered ("valid "); break;
	307	case 1: printf_unfiltered ("zero "); break;
	308	case 2: printf_unfiltered ("trap "); break;
	309	case 3: printf_unfiltered ("empty "); break;
c2d751d5 JK	310	}
c2d751d5 JK	311	for (i = 9; i >= 0; i--)
199b2450	312	printf_unfiltered ("%02x", ep->regs[fpreg][i]);
c2d751d5	313
48792545	314	floatformat_to_double (&floatformat_i387_ext, (char *)ep->regs[fpreg],
c2d751d5	315	&val);
199b2450	316	printf_unfiltered (" %g\n", val);
c2d751d5 JK	317	}
c2d751d5 JK	318	if (ep->r0)
199b2450	319	printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
c2d751d5	320	if (ep->r1)
199b2450	321	printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
c2d751d5	322	if (ep->r2)
199b2450	323	printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
c2d751d5	324	if (ep->r3)
199b2450	325	printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string(ep->r3));
c2d751d5 JK	326	}
	327
	328	/*
	329	* values that go into fp_kind (from <i386/fpreg.h>)
	330	*/
	331	#define FP_NO 0 /* no fp chip, no emulator (no fp support) */
	332	#define FP_SW 1 /* no fp chip, using software emulator */
	333	#define FP_HW 2 /* chip present bit */
	334	#define FP_287 2 /* 80287 chip present */
	335	#define FP_387 3 /* 80387 chip present */
	336
	337	typedef struct fpstate {
	338	#if 1
	339	unsigned char state[FP_STATE_BYTES]; /* "hardware" state */
	340	#else
	341	struct env387 state; /* Actually this */
	342	#endif
	343	int status; /* Duplicate status */
	344	} *fpstate_t;
	345
	346	/* Mach 3 specific routines.
	347	*/
	348	private boolean_t
	349	get_i387_state (fstate)
	350	struct fpstate *fstate;
	351	{
	352	kern_return_t ret;
	353	thread_state_data_t state;
	354	unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
	355	struct i386_float_state *fsp;
	356
	357	ret = thread_get_state (current_thread,
	358	i386_FLOAT_STATE,
	359	state,
	360	&fsCnt);
	361
	362	if (ret != KERN_SUCCESS)
	363	{
	364	message ("Can not get live floating point state: %s",
	365	mach_error_string (ret));
	366	return FALSE;
	367	}
	368
	369	fsp = (struct i386_float_state *)state;
	370	/* The 387 chip (also 486 counts) or a software emulator? */
	371	if (!fsp->initialized \|\| (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))
	372	return FALSE;
	373
	374	/* Clear the target then copy thread's float state there.
	375	Make a copy of the status word, for some reason?
	376	*/
	377	bzero (fstate, sizeof(struct fpstate));
	378
	379	fstate->status = fsp->exc_status;
	380
a6e0dae9	381	memcpy (fstate->state, (char *)&fsp->hw_state, FP_STATE_BYTES);
c2d751d5 JK	382
	383	return TRUE;
	384	}
	385
	386	private boolean_t
	387	get_i387_core_state (fstate)
	388	struct fpstate *fstate;
	389	{
	390	/* Not implemented yet. Core files do not contain float state. */
	391	return FALSE;
	392	}
	393
	394	/*
	395	* This is called by "info float" command
	396	*/
	397	void
	398	i386_mach3_float_info()
	399	{
	400	char buf [sizeof (struct fpstate) + 2 * sizeof (int)];
	401	boolean_t valid = FALSE;
	402	fpstate_t fps;
	403
	404	if (target_has_execution)
	405	valid = get_i387_state (buf);
	406	#if 0
	407	else if (WE HAVE CORE FILE) /* @@@@ Core files not supported */
	408	valid = get_i387_core_state (buf);
	409	#endif
	410
	411	if (!valid)
	412	{
	413	message("no floating point status saved");
	414	return;
	415	}
	416
	417	fps = (fpstate_t) buf;
	418
	419	print_387_status (fps->status, (struct env387 *)fps->state);
	420	}