1 /* Low level interface to i386 running the GNU Hurd.
2 Copyright 1992, 1995, 1996, 1998, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
24 #include "floatformat.h"
27 #include "gdb_assert.h"
32 #include <mach_error.h>
33 #include <mach/message.h>
34 #include <mach/exception.h>
36 #include "i386-tdep.h"
39 #include "i387-tdep.h"
41 #ifdef HAVE_SYS_PROCFS_H
42 # include <sys/procfs.h>
46 /* Offset to the thread_state_t location where REG is stored. */
47 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
49 /* At REG_OFFSET[N] is the offset to the thread_state_t location where
50 the GDB register N is stored. */
51 static int reg_offset
[] =
53 REG_OFFSET (eax
), REG_OFFSET (ecx
), REG_OFFSET (edx
), REG_OFFSET (ebx
),
54 REG_OFFSET (uesp
), REG_OFFSET (ebp
), REG_OFFSET (esi
), REG_OFFSET (edi
),
55 REG_OFFSET (eip
), REG_OFFSET (efl
), REG_OFFSET (cs
), REG_OFFSET (ss
),
56 REG_OFFSET (ds
), REG_OFFSET (es
), REG_OFFSET (fs
), REG_OFFSET (gs
)
59 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
62 /* Get the whole floating-point state of THREAD and record the
63 values of the corresponding (pseudo) registers. */
65 fetch_fpregs (struct proc
*thread
)
67 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
68 struct i386_float_state state
;
71 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
72 (thread_state_t
) &state
, &count
);
75 warning ("Couldn't fetch floating-point state from %s",
76 proc_string (thread
));
80 if (!state
.initialized
)
81 /* The floating-point state isn't initialized. */
85 for (i
= FP0_REGNUM
; i
<= FOP_REGNUM
; i
++)
86 supply_register (i
, NULL
);
91 /* Supply the floating-point registers. */
92 i387_supply_fsave (state
.hw_state
);
95 #ifdef HAVE_SYS_PROCFS_H
96 /* These two calls are used by the core-regset.c code for
97 reading ELF core files. */
99 supply_gregset (gdb_gregset_t
*gregs
)
102 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
103 supply_register (i
, REG_ADDR (gregs
, i
));
107 supply_fpregset (gdb_fpregset_t
*fpregs
)
109 i387_supply_fsave ((char *) fpregs
);
113 /* Fetch register REGNO, or all regs if REGNO is -1. */
115 gnu_fetch_registers (int regno
)
119 /* Make sure we know about new threads. */
120 inf_update_procs (current_inferior
);
122 thread
= inf_tid_to_thread (current_inferior
, PIDGET (inferior_ptid
));
124 error ("Can't fetch registers from thread %d: No such thread",
125 PIDGET (inferior_ptid
));
127 if (regno
< I386_NUM_GREGS
|| regno
== -1)
129 thread_state_t state
;
131 /* This does the dirty work for us. */
132 state
= proc_get_state (thread
, 0);
135 warning ("Couldn't fetch registers from %s",
136 proc_string (thread
));
144 proc_debug (thread
, "fetching all register");
146 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
147 supply_register (i
, REG_ADDR (state
, i
));
148 thread
->fetched_regs
= ~0;
152 proc_debug (thread
, "fetching register %s", REGISTER_NAME (regno
));
154 supply_register (regno
, REG_ADDR (state
, regno
));
155 thread
->fetched_regs
|= (1 << regno
);
159 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
161 proc_debug (thread
, "fetching floating-point registers");
163 fetch_fpregs (thread
);
168 /* Store the whole floating-point state into THREAD using information
169 from the corresponding (pseudo) registers. */
171 store_fpregs (struct proc
*thread
, int regno
)
173 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
174 struct i386_float_state state
;
177 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
178 (thread_state_t
) &state
, &count
);
181 warning ("Couldn't fetch floating-point state from %s",
182 proc_string (thread
));
186 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
187 take into account REGISTER_VALID like the old code did? */
188 i387_fill_fsave (state
.hw_state
, regno
);
190 err
= thread_set_state (thread
->port
, i386_FLOAT_STATE
,
191 (thread_state_t
) &state
, i386_FLOAT_STATE_COUNT
);
194 warning ("Couldn't store floating-point state into %s",
195 proc_string (thread
));
200 /* Store at least register REGNO, or all regs if REGNO == -1. */
202 gnu_store_registers (int regno
)
206 /* Make sure we know about new threads. */
207 inf_update_procs (current_inferior
);
209 thread
= inf_tid_to_thread (current_inferior
, PIDGET (inferior_ptid
));
211 error ("Couldn't store registers into thread %d: No such thread",
212 PIDGET (inferior_ptid
));
214 if (regno
< I386_NUM_GREGS
|| regno
== -1)
216 thread_state_t state
;
217 thread_state_data_t old_state
;
218 int was_aborted
= thread
->aborted
;
219 int was_valid
= thread
->state_valid
;
222 if (!was_aborted
&& was_valid
)
223 memcpy (&old_state
, &thread
->state
, sizeof (old_state
));
225 state
= proc_get_state (thread
, 1);
228 warning ("Couldn't store registers into %s", proc_string (thread
));
232 /* Save the T bit. We might try to restore the %eflags register
233 below, but changing the T bit would seriously confuse GDB. */
234 trace
= ((struct i386_thread_state
*)state
)->efl
& 0x100;
236 if (!was_aborted
&& was_valid
)
237 /* See which registers have changed after aborting the thread. */
241 for (check_regno
= 0; check_regno
< I386_NUM_GREGS
; check_regno
++)
242 if ((thread
->fetched_regs
& (1 << check_regno
))
243 && memcpy (REG_ADDR (&old_state
, check_regno
),
244 REG_ADDR (state
, check_regno
),
245 REGISTER_RAW_SIZE (check_regno
)))
246 /* Register CHECK_REGNO has changed! Ack! */
248 warning ("Register %s changed after the thread was aborted",
249 REGISTER_NAME (check_regno
));
250 if (regno
>= 0 && regno
!= check_regno
)
251 /* Update GDB's copy of the register. */
252 supply_register (check_regno
, REG_ADDR (state
, check_regno
));
254 warning ("... also writing this register! Suspicious...");
258 #define fill(state, regno) \
259 memcpy (REG_ADDR(state, regno), ®isters[REGISTER_BYTE (regno)], \
260 REGISTER_RAW_SIZE (regno))
266 proc_debug (thread
, "storing all registers");
268 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
269 if (register_valid
[i
])
274 proc_debug (thread
, "storing register %s", REGISTER_NAME (regno
));
276 gdb_assert (register_valid
[regno
]);
280 /* Restore the T bit. */
281 ((struct i386_thread_state
*)state
)->efl
&= ~0x100;
282 ((struct i386_thread_state
*)state
)->efl
|= trace
;
287 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
289 proc_debug (thread
, "storing floating-point registers");
291 store_fpregs (thread
, regno
);