[deliverable/binutils-gdb.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 ();

extern struct ext_format ext_format_i387;

#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*sizeof (REGISTER_TYPE))

/* 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*sizeof (REGISTER_TYPE))
\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;
}

/* 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 (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]);
      
      ieee_extended_to_double (&ext_format_i387, (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
	58	extern struct ext_format ext_format_i387;
	59
	60	#define private static
	61
	62	\f
	63	/* Find offsets to thread states at compile time.
	64	* If your compiler does not grok this, calculate offsets
65	* offsets yourself and use them (or get a compatible compiler :-)
66	*/
67
68	#define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)
69
70	/* at reg_offset[i] is the offset to the i386_thread_state
71	* location where the gdb registers[i] is stored.
72	*/
73
74	static int reg_offset[] =
75	{
76	REG_OFFSET(eax), REG_OFFSET(ecx), REG_OFFSET(edx), REG_OFFSET(ebx),
77	REG_OFFSET(uesp), REG_OFFSET(ebp), REG_OFFSET(esi), REG_OFFSET(edi),
78	REG_OFFSET(eip), REG_OFFSET(efl), REG_OFFSET(cs), REG_OFFSET(ss),
79	REG_OFFSET(ds), REG_OFFSET(es), REG_OFFSET(fs), REG_OFFSET(gs)
80	};
81
82	#define REG_ADDRESS(state,regnum) ((char *)(state)+reg_offset[regnum])
83
84	/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
85	* Caller knows that the regs handled in one transaction are of same size.
86	*/
87	#define FETCH_REGS(state, regnum, count) \
a6e0dae9 JK	88	memcpy (&registers[REGISTER_BYTE (regnum)], \
	89	REG_ADDRESS (state, regnum), \
	90	count*sizeof (REGISTER_TYPE))
c2d751d5 JK	91
	92	/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
	93	#define STORE_REGS(state, regnum, count) \
a6e0dae9 JK	94	memcpy (REG_ADDRESS (state, regnum), \
	95	&registers[REGISTER_BYTE (regnum)], \
	96	count*sizeof (REGISTER_TYPE))
c2d751d5 JK	97	\f
	98	/*
	99	* Fetch inferiors registers for gdb.
	100	* REGNO specifies which (as gdb views it) register, -1 for all.
	101	*/
	102
	103	void
	104	fetch_inferior_registers (regno)
	105	int regno;
	106	{
	107	kern_return_t ret;
	108	thread_state_data_t state;
	109	unsigned int stateCnt = i386_THREAD_STATE_COUNT;
	110	int index;
	111
	112	if (! MACH_PORT_VALID (current_thread))
	113	error ("fetch inferior registers: Invalid thread");
	114
	115	if (must_suspend_thread)
	116	setup_thread (current_thread, 1);
	117
	118	ret = thread_get_state (current_thread,
	119	i386_THREAD_STATE,
	120	state,
	121	&stateCnt);
	122
	123	if (ret != KERN_SUCCESS)
	124	message ("fetch_inferior_registers: %s ",
	125	mach_error_string (ret));
	126	#if 0
	127	/* It may be more effective to store validate all of them,
	128	* since we fetched them all anyway
	129	*/
	130	else if (regno != -1)
	131	supply_register (regno, (char *)state+reg_offset[regno]);
	132	#endif
	133	else
	134	{
	135	for (index = 0; index < NUM_REGS; index++)
	136	supply_register (index, (char *)state+reg_offset[index]);
	137	}
	138
	139	if (must_suspend_thread)
	140	setup_thread (current_thread, 0);
	141	}
	142	\f
	143	/* Store our register values back into the inferior.
	144	* If REGNO is -1, do this for all registers.
	145	* Otherwise, REGNO specifies which register
	146	*
	147	* On mach3 all registers are always saved in one call.
	148	*/
	149	void
	150	store_inferior_registers (regno)
	151	int regno;
	152	{
	153	kern_return_t ret;
	154	thread_state_data_t state;
	155	unsigned int stateCnt = i386_THREAD_STATE_COUNT;
	156	register int index;
	157
	158	if (! MACH_PORT_VALID (current_thread))
	159	error ("store inferior registers: Invalid thread");
	160
161	if (must_suspend_thread)
162	setup_thread (current_thread, 1);
163
164	/* Fetch the state of the current thread */
165	ret = thread_get_state (current_thread,
166	i386_THREAD_STATE,
167	state,
168	&stateCnt);
169
170	if (ret != KERN_SUCCESS)
171	{
172	message ("store_inferior_registers (get): %s",
173	mach_error_string (ret));
174	if (must_suspend_thread)
175	setup_thread (current_thread, 0);
176	return;
177	}
178
179	/* move gdb's registers to thread's state
180	*
181	* Since we save all registers anyway, save the ones
182	* that gdb thinks are valid (e.g. ignore the regno
183	* parameter)
184	*/
185	#if 0
186	if (regno != -1)
187	STORE_REGS (state, regno, 1);
188	else
189	#endif
190	{
191	for (index = 0; index < NUM_REGS; index++)
192	STORE_REGS (state, index, 1);
193	}
194
195	/* Write gdb's current view of register to the thread
196	*/
197	ret = thread_set_state (current_thread,
198	i386_THREAD_STATE,
199	state,
200	i386_THREAD_STATE_COUNT);
201
202	if (ret != KERN_SUCCESS)
203	message ("store_inferior_registers (set): %s",
204	mach_error_string (ret));
205
206	if (must_suspend_thread)
207	setup_thread (current_thread, 0);
208	}
209
210	\f
211
212	/* Return the address in the core dump or inferior of register REGNO.
213	* BLOCKEND should be the address of the end of the UPAGES area read
214	* in memory, but it's not?
215	*
216	* Currently our UX server dumps the whole thread state to the
217	* core file. If your UX does something else, adapt the routine
218	* below to return the offset to the given register.
219	*
220	* Called by coredep.c(fetch_core_registers)
221	*/
222
223	unsigned int
224	register_addr (regno, blockend)
225	int regno;
226	int blockend;
227	{
228	unsigned int addr;
229
230	if (regno < 0 \|\| regno >= NUM_REGS)
231	error ("Invalid register number %d.", regno);
232
233	/* UAREA_SIZE == 8 kB in i386 */
234	addr = (unsigned int)REG_ADDRESS (UAREA_SIZE - sizeof(struct i386_thread_state), regno);
235
236	return addr;
237	}
238
239	/* jtv@hut.fi: I copied and modified this 387 code from
240	* gdb/i386-xdep.c. Modifications for Mach 3.0.
241	*
242	* i387 status dumper. See also i387-tdep.c
243	*/
244	struct env387
245	{
246	unsigned short control;
247	unsigned short r0;
248	unsigned short status;
249	unsigned short r1;
250	unsigned short tag;
251	unsigned short r2;
252	unsigned long eip;
253	unsigned short code_seg;
254	unsigned short opcode;
255	unsigned long operand;
256	unsigned short operand_seg;
257	unsigned short r3;
258	unsigned char regs[8][10];
259	};
260	/* This routine is machine independent?
261	* Should move it to i387-tdep.c but you need to export struct env387
262	*/
263	private
264	print_387_status (status, ep)
265	unsigned short status;
266	struct env387 *ep;
267	{
268	int i;
269	int bothstatus;
270	int top;
271	int fpreg;
272	unsigned char *p;
273
274	bothstatus = ((status != 0) && (ep->status != 0));
275	if (status != 0)
276	{
277	if (bothstatus)
199b2450	278	printf_unfiltered ("u: ");
c2d751d5 JK	279	print_387_status_word (status);
	280	}
	281
	282	if (ep->status != 0)
	283	{
	284	if (bothstatus)
199b2450	285	printf_unfiltered ("e: ");
c2d751d5 JK	286	print_387_status_word (ep->status);
	287	}
	288
	289	print_387_control_word (ep->control);
199b2450 TL	290	printf_unfiltered ("last exception: ");
	291	printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
	292	printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
	293	printf_unfiltered ("%s; ", local_hex_string(ep->eip));
	294	printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
	295	printf_unfiltered (":%s\n", local_hex_string(ep->operand));
c2d751d5 JK	296
	297	top = (ep->status >> 11) & 7;
	298
199b2450	299	printf_unfiltered ("regno tag msb lsb value\n");
c2d751d5 JK	300	for (fpreg = 7; fpreg >= 0; fpreg--)
	301	{
	302	double val;
	303
199b2450	304	printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
c2d751d5 JK	305
	306	switch ((ep->tag >> (fpreg * 2)) & 3)
	307	{
199b2450 TL	308	case 0: printf_unfiltered ("valid "); break;
	309	case 1: printf_unfiltered ("zero "); break;
	310	case 2: printf_unfiltered ("trap "); break;
	311	case 3: printf_unfiltered ("empty "); break;
c2d751d5 JK	312	}
c2d751d5 JK	313	for (i = 9; i >= 0; i--)
199b2450	314	printf_unfiltered ("%02x", ep->regs[fpreg][i]);
c2d751d5 JK	315
	316	ieee_extended_to_double (&ext_format_i387, (char *)ep->regs[fpreg],
	317	&val);
199b2450	318	printf_unfiltered (" %g\n", val);
c2d751d5 JK	319	}
c2d751d5 JK	320	if (ep->r0)
199b2450	321	printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
c2d751d5	322	if (ep->r1)
199b2450	323	printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
c2d751d5	324	if (ep->r2)
199b2450	325	printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
c2d751d5	326	if (ep->r3)
199b2450	327	printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string(ep->r3));
c2d751d5 JK	328	}
	329
	330	/*
	331	* values that go into fp_kind (from <i386/fpreg.h>)
	332	*/
	333	#define FP_NO 0 /* no fp chip, no emulator (no fp support) */
	334	#define FP_SW 1 /* no fp chip, using software emulator */
	335	#define FP_HW 2 /* chip present bit */
	336	#define FP_287 2 /* 80287 chip present */
	337	#define FP_387 3 /* 80387 chip present */
	338
	339	typedef struct fpstate {
	340	#if 1
	341	unsigned char state[FP_STATE_BYTES]; /* "hardware" state */
	342	#else
	343	struct env387 state; /* Actually this */
	344	#endif
	345	int status; /* Duplicate status */
	346	} *fpstate_t;
	347
	348	/* Mach 3 specific routines.
	349	*/
	350	private boolean_t
	351	get_i387_state (fstate)
	352	struct fpstate *fstate;
	353	{
	354	kern_return_t ret;
	355	thread_state_data_t state;
	356	unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
	357	struct i386_float_state *fsp;
	358
	359	ret = thread_get_state (current_thread,
	360	i386_FLOAT_STATE,
	361	state,
	362	&fsCnt);
	363
	364	if (ret != KERN_SUCCESS)
	365	{
	366	message ("Can not get live floating point state: %s",
	367	mach_error_string (ret));
	368	return FALSE;
	369	}
	370
	371	fsp = (struct i386_float_state *)state;
	372	/* The 387 chip (also 486 counts) or a software emulator? */
	373	if (!fsp->initialized \|\| (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))
	374	return FALSE;
	375
	376	/* Clear the target then copy thread's float state there.
	377	Make a copy of the status word, for some reason?
	378	*/
	379	bzero (fstate, sizeof(struct fpstate));
	380
	381	fstate->status = fsp->exc_status;
	382
a6e0dae9	383	memcpy (fstate->state, (char *)&fsp->hw_state, FP_STATE_BYTES);
c2d751d5 JK	384
	385	return TRUE;
	386	}
	387
	388	private boolean_t
	389	get_i387_core_state (fstate)
	390	struct fpstate *fstate;
	391	{
	392	/* Not implemented yet. Core files do not contain float state. */
	393	return FALSE;
	394	}
	395
	396	/*
	397	* This is called by "info float" command
	398	*/
	399	void
	400	i386_mach3_float_info()
	401	{
	402	char buf [sizeof (struct fpstate) + 2 * sizeof (int)];
	403	boolean_t valid = FALSE;
	404	fpstate_t fps;
	405
	406	if (target_has_execution)
	407	valid = get_i387_state (buf);
	408	#if 0
	409	else if (WE HAVE CORE FILE) /* @@@@ Core files not supported */
	410	valid = get_i387_core_state (buf);
	411	#endif
	412
	413	if (!valid)
	414	{
	415	message("no floating point status saved");
	416	return;
	417	}
	418
	419	fps = (fpstate_t) buf;
	420
	421	print_387_status (fps->status, (struct env387 *)fps->state);
	422	}