1 /* Low level interface to i386 running the GNU Hurd.
3 Copyright 1992, 1995, 1996, 1998, 2000, 2001, 2004
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
25 #include "floatformat.h"
28 #include "gdb_assert.h"
33 #include <mach_error.h>
34 #include <mach/message.h>
35 #include <mach/exception.h>
37 #include "i386-tdep.h"
40 #include "i387-tdep.h"
42 #ifdef HAVE_SYS_PROCFS_H
43 # include <sys/procfs.h>
47 /* Offset to the thread_state_t location where REG is stored. */
48 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
50 /* At REG_OFFSET[N] is the offset to the thread_state_t location where
51 the GDB register N is stored. */
52 static int reg_offset
[] =
54 REG_OFFSET (eax
), REG_OFFSET (ecx
), REG_OFFSET (edx
), REG_OFFSET (ebx
),
55 REG_OFFSET (uesp
), REG_OFFSET (ebp
), REG_OFFSET (esi
), REG_OFFSET (edi
),
56 REG_OFFSET (eip
), REG_OFFSET (efl
), REG_OFFSET (cs
), REG_OFFSET (ss
),
57 REG_OFFSET (ds
), REG_OFFSET (es
), REG_OFFSET (fs
), REG_OFFSET (gs
)
60 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
63 /* Get the whole floating-point state of THREAD and record the
64 values of the corresponding (pseudo) registers. */
66 fetch_fpregs (struct proc
*thread
)
68 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
69 struct i386_float_state state
;
72 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
73 (thread_state_t
) &state
, &count
);
76 warning ("Couldn't fetch floating-point state from %s",
77 proc_string (thread
));
81 if (!state
.initialized
)
82 /* The floating-point state isn't initialized. */
86 for (i
= FP0_REGNUM
; i
<= FOP_REGNUM
; i
++)
87 regcache_raw_supply (current_regcache
, i
, NULL
);
92 /* Supply the floating-point registers. */
93 i387_supply_fsave (current_regcache
, -1, state
.hw_state
);
96 #ifdef HAVE_SYS_PROCFS_H
97 /* These two calls are used by the core-regset.c code for
98 reading ELF core files. */
100 supply_gregset (gdb_gregset_t
*gregs
)
103 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
104 regcache_raw_supply (current_regcache
, i
, REG_ADDR (gregs
, i
));
108 supply_fpregset (gdb_fpregset_t
*fpregs
)
110 i387_supply_fsave (current_regcache
, -1, fpregs
);
114 /* Fetch register REGNO, or all regs if REGNO is -1. */
116 gnu_fetch_registers (int regno
)
120 /* Make sure we know about new threads. */
121 inf_update_procs (current_inferior
);
123 thread
= inf_tid_to_thread (current_inferior
, PIDGET (inferior_ptid
));
125 error ("Can't fetch registers from thread %d: No such thread",
126 PIDGET (inferior_ptid
));
128 if (regno
< I386_NUM_GREGS
|| regno
== -1)
130 thread_state_t state
;
132 /* This does the dirty work for us. */
133 state
= proc_get_state (thread
, 0);
136 warning ("Couldn't fetch registers from %s",
137 proc_string (thread
));
145 proc_debug (thread
, "fetching all register");
147 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
148 regcache_raw_supply (current_regcache
, i
, REG_ADDR (state
, i
));
149 thread
->fetched_regs
= ~0;
153 proc_debug (thread
, "fetching register %s", REGISTER_NAME (regno
));
155 regcache_raw_supply (current_regcache
, regno
,
156 REG_ADDR (state
, regno
));
157 thread
->fetched_regs
|= (1 << regno
);
161 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
163 proc_debug (thread
, "fetching floating-point registers");
165 fetch_fpregs (thread
);
170 /* Store the whole floating-point state into THREAD using information
171 from the corresponding (pseudo) registers. */
173 store_fpregs (struct proc
*thread
, int regno
)
175 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
176 struct i386_float_state state
;
179 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
180 (thread_state_t
) &state
, &count
);
183 warning ("Couldn't fetch floating-point state from %s",
184 proc_string (thread
));
188 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
189 take into account DEPRECATED_REGISTER_VALID like the old code did? */
190 i387_fill_fsave (state
.hw_state
, regno
);
192 err
= thread_set_state (thread
->port
, i386_FLOAT_STATE
,
193 (thread_state_t
) &state
, i386_FLOAT_STATE_COUNT
);
196 warning ("Couldn't store floating-point state into %s",
197 proc_string (thread
));
202 /* Store at least register REGNO, or all regs if REGNO == -1. */
204 gnu_store_registers (int regno
)
206 struct regcache
*regcache
= current_regcache
;
209 /* Make sure we know about new threads. */
210 inf_update_procs (current_inferior
);
212 thread
= inf_tid_to_thread (current_inferior
, PIDGET (inferior_ptid
));
214 error ("Couldn't store registers into thread %d: No such thread",
215 PIDGET (inferior_ptid
));
217 if (regno
< I386_NUM_GREGS
|| regno
== -1)
219 thread_state_t state
;
220 thread_state_data_t old_state
;
221 int was_aborted
= thread
->aborted
;
222 int was_valid
= thread
->state_valid
;
225 if (!was_aborted
&& was_valid
)
226 memcpy (&old_state
, &thread
->state
, sizeof (old_state
));
228 state
= proc_get_state (thread
, 1);
231 warning ("Couldn't store registers into %s", proc_string (thread
));
235 /* Save the T bit. We might try to restore the %eflags register
236 below, but changing the T bit would seriously confuse GDB. */
237 trace
= ((struct i386_thread_state
*)state
)->efl
& 0x100;
239 if (!was_aborted
&& was_valid
)
240 /* See which registers have changed after aborting the thread. */
244 for (check_regno
= 0; check_regno
< I386_NUM_GREGS
; check_regno
++)
245 if ((thread
->fetched_regs
& (1 << check_regno
))
246 && memcpy (REG_ADDR (&old_state
, check_regno
),
247 REG_ADDR (state
, check_regno
),
248 register_size (current_gdbarch
, check_regno
)))
249 /* Register CHECK_REGNO has changed! Ack! */
251 warning ("Register %s changed after the thread was aborted",
252 REGISTER_NAME (check_regno
));
253 if (regno
>= 0 && regno
!= check_regno
)
254 /* Update GDB's copy of the register. */
255 regcache_raw_supply (regcache
, check_regno
,
256 REG_ADDR (state
, check_regno
));
258 warning ("... also writing this register! Suspicious...");
266 proc_debug (thread
, "storing all registers");
268 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
269 if (regcache_valid_p (regcache
, i
))
270 regcache_raw_collect (regcache
, i
, REG_ADDR (state
, i
));
274 proc_debug (thread
, "storing register %s", REGISTER_NAME (regno
));
276 gdb_assert (regcache_valid_p (regcache
, regno
));
277 regcache_raw_collect (regcache
, regno
, REG_ADDR (state
, regno
));
280 /* Restore the T bit. */
281 ((struct i386_thread_state
*)state
)->efl
&= ~0x100;
282 ((struct i386_thread_state
*)state
)->efl
|= trace
;
285 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
287 proc_debug (thread
, "storing floating-point registers");
289 store_fpregs (thread
, regno
);