1 /* Low level interface to I386 running mach 3.0.
2 Copyright 1992, 2001 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
23 #include "floatformat.h"
29 #include <mach/message.h>
30 #include <mach/exception.h>
31 #include <mach_error.h>
33 /* Hmmm... Should this not be here?
34 * Now for i386_float_info() target_has_execution
38 /* This mess is duplicated in bfd/i386mach3.h
40 * This is an ugly way to hack around the incorrect
41 * definition of UPAGES in i386/machparam.h.
43 * The definition should specify the size reserved
44 * for "struct user" in core files in PAGES,
45 * but instead it gives it in 512-byte core-clicks
48 #include <sys/param.h>
50 #define UAREA_SIZE ctob(UPAGES)
52 #define UAREA_SIZE (NBPG*UPAGES)
54 FIXME
! !UPAGES is neither
2 nor
16
57 /* @@@ Should move print_387_status() to i387-tdep.c */
58 extern void print_387_control_word (); /* i387-tdep.h */
59 extern void print_387_status_word ();
61 #define private static
64 /* Find offsets to thread states at compile time.
65 * If your compiler does not grok this, calculate offsets
66 * offsets yourself and use them (or get a compatible compiler :-)
69 #define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)
71 /* at reg_offset[i] is the offset to the i386_thread_state
72 * location where the gdb registers[i] is stored.
75 static int reg_offset
[] =
77 REG_OFFSET (eax
), REG_OFFSET (ecx
), REG_OFFSET (edx
), REG_OFFSET (ebx
),
78 REG_OFFSET (uesp
), REG_OFFSET (ebp
), REG_OFFSET (esi
), REG_OFFSET (edi
),
79 REG_OFFSET (eip
), REG_OFFSET (efl
), REG_OFFSET (cs
), REG_OFFSET (ss
),
80 REG_OFFSET (ds
), REG_OFFSET (es
), REG_OFFSET (fs
), REG_OFFSET (gs
)
83 #define REG_ADDRESS(state,regnum) ((char *)(state)+reg_offset[regnum])
85 /* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
86 * Caller knows that the regs handled in one transaction are of same size.
88 #define FETCH_REGS(state, regnum, count) \
89 memcpy (®isters[REGISTER_BYTE (regnum)], \
90 REG_ADDRESS (state, regnum), \
93 /* Store COUNT contiguous registers to thread STATE starting from REGNUM */
94 #define STORE_REGS(state, regnum, count) \
95 memcpy (REG_ADDRESS (state, regnum), \
96 ®isters[REGISTER_BYTE (regnum)], \
100 * Fetch inferiors registers for gdb.
101 * REGNO specifies which (as gdb views it) register, -1 for all.
105 fetch_inferior_registers (int regno
)
108 thread_state_data_t state
;
109 unsigned int stateCnt
= i386_THREAD_STATE_COUNT
;
112 if (!MACH_PORT_VALID (current_thread
))
113 error ("fetch inferior registers: Invalid thread");
115 if (must_suspend_thread
)
116 setup_thread (current_thread
, 1);
118 ret
= thread_get_state (current_thread
,
123 if (ret
!= KERN_SUCCESS
)
124 warning ("fetch_inferior_registers: %s ",
125 mach_error_string (ret
));
127 /* It may be more effective to store validate all of them,
128 * since we fetched them all anyway
130 else if (regno
!= -1)
131 supply_register (regno
, (char *) state
+ reg_offset
[regno
]);
135 for (index
= 0; index
< NUM_REGS
; index
++)
136 supply_register (index
, (char *) state
+ reg_offset
[index
]);
139 if (must_suspend_thread
)
140 setup_thread (current_thread
, 0);
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
147 * On mach3 all registers are always saved in one call.
150 store_inferior_registers (int regno
)
153 thread_state_data_t state
;
154 unsigned int stateCnt
= i386_THREAD_STATE_COUNT
;
157 if (!MACH_PORT_VALID (current_thread
))
158 error ("store inferior registers: Invalid thread");
160 if (must_suspend_thread
)
161 setup_thread (current_thread
, 1);
163 /* Fetch the state of the current thread */
164 ret
= thread_get_state (current_thread
,
169 if (ret
!= KERN_SUCCESS
)
171 warning ("store_inferior_registers (get): %s",
172 mach_error_string (ret
));
173 if (must_suspend_thread
)
174 setup_thread (current_thread
, 0);
178 /* move gdb's registers to thread's state
180 * Since we save all registers anyway, save the ones
181 * that gdb thinks are valid (e.g. ignore the regno
186 STORE_REGS (state
, regno
, 1);
190 for (index
= 0; index
< NUM_REGS
; index
++)
191 STORE_REGS (state
, index
, 1);
194 /* Write gdb's current view of register to the thread
196 ret
= thread_set_state (current_thread
,
199 i386_THREAD_STATE_COUNT
);
201 if (ret
!= KERN_SUCCESS
)
202 warning ("store_inferior_registers (set): %s",
203 mach_error_string (ret
));
205 if (must_suspend_thread
)
206 setup_thread (current_thread
, 0);
211 /* Return the address in the core dump or inferior of register REGNO.
212 * BLOCKEND should be the address of the end of the UPAGES area read
213 * in memory, but it's not?
215 * Currently our UX server dumps the whole thread state to the
216 * core file. If your UX does something else, adapt the routine
217 * below to return the offset to the given register.
219 * Called by core-aout.c(fetch_core_registers)
223 register_addr (int regno
, CORE_ADDR blockend
)
227 if (regno
< 0 || regno
>= NUM_REGS
)
228 error ("Invalid register number %d.", regno
);
230 /* UAREA_SIZE == 8 kB in i386 */
231 addr
= (unsigned int) REG_ADDRESS (UAREA_SIZE
- sizeof (struct i386_thread_state
), regno
);
236 /* jtv@hut.fi: I copied and modified this 387 code from
237 * gdb/i386-xdep.c. Modifications for Mach 3.0.
239 * i387 status dumper. See also i387-tdep.c
243 unsigned short control
;
245 unsigned short status
;
250 unsigned short code_seg
;
251 unsigned short opcode
;
252 unsigned long operand
;
253 unsigned short operand_seg
;
255 unsigned char regs
[8][10];
257 /* This routine is machine independent?
258 * Should move it to i387-tdep.c but you need to export struct env387
261 print_387_status (unsigned short status
, struct env387
*ep
)
269 bothstatus
= ((status
!= 0) && (ep
->status
!= 0));
273 printf_unfiltered ("u: ");
274 print_387_status_word (status
);
280 printf_unfiltered ("e: ");
281 print_387_status_word (ep
->status
);
284 print_387_control_word (ep
->control
);
285 printf_unfiltered ("last exception: ");
286 printf_unfiltered ("opcode %s; ", local_hex_string (ep
->opcode
));
287 printf_unfiltered ("pc %s:", local_hex_string (ep
->code_seg
));
288 printf_unfiltered ("%s; ", local_hex_string (ep
->eip
));
289 printf_unfiltered ("operand %s", local_hex_string (ep
->operand_seg
));
290 printf_unfiltered (":%s\n", local_hex_string (ep
->operand
));
292 top
= (ep
->status
>> 11) & 7;
294 printf_unfiltered ("regno tag msb lsb value\n");
295 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
299 printf_unfiltered ("%s %d: ", fpreg
== top
? "=>" : " ", fpreg
);
301 switch ((ep
->tag
>> (fpreg
* 2)) & 3)
304 printf_unfiltered ("valid ");
307 printf_unfiltered ("zero ");
310 printf_unfiltered ("trap ");
313 printf_unfiltered ("empty ");
316 for (i
= 9; i
>= 0; i
--)
317 printf_unfiltered ("%02x", ep
->regs
[fpreg
][i
]);
319 floatformat_to_double (&floatformat_i387_ext
, (char *) ep
->regs
[fpreg
],
321 printf_unfiltered (" %g\n", val
);
324 printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string (ep
->r0
));
326 printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string (ep
->r1
));
328 printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string (ep
->r2
));
330 printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string (ep
->r3
));
334 * values that go into fp_kind (from <i386/fpreg.h>)
336 #define FP_NO 0 /* no fp chip, no emulator (no fp support) */
337 #define FP_SW 1 /* no fp chip, using software emulator */
338 #define FP_HW 2 /* chip present bit */
339 #define FP_287 2 /* 80287 chip present */
340 #define FP_387 3 /* 80387 chip present */
342 typedef struct fpstate
345 unsigned char state
[FP_STATE_BYTES
]; /* "hardware" state */
347 struct env387 state
; /* Actually this */
349 int status
; /* Duplicate status */
353 /* Mach 3 specific routines.
356 get_i387_state (struct fpstate
*fstate
)
359 thread_state_data_t state
;
360 unsigned int fsCnt
= i386_FLOAT_STATE_COUNT
;
361 struct i386_float_state
*fsp
;
363 ret
= thread_get_state (current_thread
,
368 if (ret
!= KERN_SUCCESS
)
370 warning ("Can not get live floating point state: %s",
371 mach_error_string (ret
));
375 fsp
= (struct i386_float_state
*) state
;
376 /* The 387 chip (also 486 counts) or a software emulator? */
377 if (!fsp
->initialized
|| (fsp
->fpkind
!= FP_387
&& fsp
->fpkind
!= FP_SW
))
380 /* Clear the target then copy thread's float state there.
381 Make a copy of the status word, for some reason?
383 memset (fstate
, 0, sizeof (struct fpstate
));
385 fstate
->status
= fsp
->exc_status
;
387 memcpy (fstate
->state
, (char *) &fsp
->hw_state
, FP_STATE_BYTES
);
393 get_i387_core_state (struct fpstate
*fstate
)
395 /* Not implemented yet. Core files do not contain float state. */
400 * This is called by "info float" command
403 i386_mach3_float_info (void)
405 char buf
[sizeof (struct fpstate
) + 2 * sizeof (int)];
406 boolean_t valid
= FALSE
;
409 if (target_has_execution
)
410 valid
= get_i387_state (buf
);
412 else if (WE HAVE CORE
FILE) /* @@@@ Core files not supported */
413 valid
= get_i387_core_state (buf
);
418 warning ("no floating point status saved");
422 fps
= (fpstate_t
) buf
;
424 print_387_status (fps
->status
, (struct env387
*) fps
->state
);