1 /* Low level interface to i386 running the GNU Hurd.
3 Copyright (C) 1992-2014 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 3 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, see <http://www.gnu.org/licenses/>. */
22 #include "floatformat.h"
26 #include <mach_error.h>
27 #include <mach/message.h>
28 #include <mach/exception.h>
30 #include "i386-tdep.h"
33 #include "i387-tdep.h"
35 #ifdef HAVE_SYS_PROCFS_H
36 # include <sys/procfs.h>
40 /* Offset to the thread_state_t location where REG is stored. */
41 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
43 /* At REG_OFFSET[N] is the offset to the thread_state_t location where
44 the GDB register N is stored. */
45 static int reg_offset
[] =
47 REG_OFFSET (eax
), REG_OFFSET (ecx
), REG_OFFSET (edx
), REG_OFFSET (ebx
),
48 REG_OFFSET (uesp
), REG_OFFSET (ebp
), REG_OFFSET (esi
), REG_OFFSET (edi
),
49 REG_OFFSET (eip
), REG_OFFSET (efl
), REG_OFFSET (cs
), REG_OFFSET (ss
),
50 REG_OFFSET (ds
), REG_OFFSET (es
), REG_OFFSET (fs
), REG_OFFSET (gs
)
53 /* Offset to the greg_t location where REG is stored. */
54 #define CREG_OFFSET(reg) (REG_##reg * 4)
56 /* At CREG_OFFSET[N] is the offset to the greg_t location where
57 the GDB register N is stored. */
58 static int creg_offset
[] =
60 CREG_OFFSET (EAX
), CREG_OFFSET (ECX
), CREG_OFFSET (EDX
), CREG_OFFSET (EBX
),
61 CREG_OFFSET (UESP
), CREG_OFFSET (EBP
), CREG_OFFSET (ESI
), CREG_OFFSET (EDI
),
62 CREG_OFFSET (EIP
), CREG_OFFSET (EFL
), CREG_OFFSET (CS
), CREG_OFFSET (SS
),
63 CREG_OFFSET (DS
), CREG_OFFSET (ES
), CREG_OFFSET (FS
), CREG_OFFSET (GS
)
66 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
67 #define CREG_ADDR(state, regnum) ((const char *)(state) + creg_offset[regnum])
70 /* Get the whole floating-point state of THREAD and record the values
71 of the corresponding (pseudo) registers. */
74 fetch_fpregs (struct regcache
*regcache
, struct proc
*thread
)
76 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
77 struct i386_float_state state
;
80 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
81 (thread_state_t
) &state
, &count
);
84 warning (_("Couldn't fetch floating-point state from %s"),
85 proc_string (thread
));
89 if (!state
.initialized
)
91 /* The floating-point state isn't initialized. */
92 i387_supply_fsave (regcache
, -1, NULL
);
96 /* Supply the floating-point registers. */
97 i387_supply_fsave (regcache
, -1, state
.hw_state
);
101 #ifdef HAVE_SYS_PROCFS_H
102 /* These two calls are used by the core-regset.c code for
103 reading ELF core files. */
105 supply_gregset (struct regcache
*regcache
, const gdb_gregset_t
*gregs
)
108 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
109 regcache_raw_supply (regcache
, i
, CREG_ADDR (gregs
, i
));
113 supply_fpregset (struct regcache
*regcache
, const gdb_fpregset_t
*fpregs
)
115 i387_supply_fsave (regcache
, -1, fpregs
);
119 /* Fetch register REGNO, or all regs if REGNO is -1. */
121 gnu_fetch_registers (struct target_ops
*ops
,
122 struct regcache
*regcache
, int regno
)
126 /* Make sure we know about new threads. */
127 inf_update_procs (gnu_current_inf
);
129 thread
= inf_tid_to_thread (gnu_current_inf
,
130 ptid_get_lwp (inferior_ptid
));
132 error (_("Can't fetch registers from thread %s: No such thread"),
133 target_pid_to_str (inferior_ptid
));
135 if (regno
< I386_NUM_GREGS
|| regno
== -1)
137 thread_state_t state
;
139 /* This does the dirty work for us. */
140 state
= proc_get_state (thread
, 0);
143 warning (_("Couldn't fetch registers from %s"),
144 proc_string (thread
));
152 proc_debug (thread
, "fetching all register");
154 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
155 regcache_raw_supply (regcache
, i
, REG_ADDR (state
, i
));
156 thread
->fetched_regs
= ~0;
160 proc_debug (thread
, "fetching register %s",
161 gdbarch_register_name (get_regcache_arch (regcache
),
164 regcache_raw_supply (regcache
, regno
,
165 REG_ADDR (state
, regno
));
166 thread
->fetched_regs
|= (1 << regno
);
170 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
172 proc_debug (thread
, "fetching floating-point registers");
174 fetch_fpregs (regcache
, thread
);
179 /* Store the whole floating-point state into THREAD using information
180 from the corresponding (pseudo) registers. */
182 store_fpregs (const struct regcache
*regcache
, struct proc
*thread
, int regno
)
184 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
185 struct i386_float_state state
;
188 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
189 (thread_state_t
) &state
, &count
);
192 warning (_("Couldn't fetch floating-point state from %s"),
193 proc_string (thread
));
197 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
198 take into account DEPRECATED_REGISTER_VALID like the old code did? */
199 i387_collect_fsave (regcache
, regno
, state
.hw_state
);
201 err
= thread_set_state (thread
->port
, i386_FLOAT_STATE
,
202 (thread_state_t
) &state
, i386_FLOAT_STATE_COUNT
);
205 warning (_("Couldn't store floating-point state into %s"),
206 proc_string (thread
));
211 /* Store at least register REGNO, or all regs if REGNO == -1. */
213 gnu_store_registers (struct target_ops
*ops
,
214 struct regcache
*regcache
, int regno
)
217 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
219 /* Make sure we know about new threads. */
220 inf_update_procs (gnu_current_inf
);
222 thread
= inf_tid_to_thread (gnu_current_inf
,
223 ptid_get_lwp (inferior_ptid
));
225 error (_("Couldn't store registers into thread %s: No such thread"),
226 target_pid_to_str (inferior_ptid
));
228 if (regno
< I386_NUM_GREGS
|| regno
== -1)
230 thread_state_t state
;
231 thread_state_data_t old_state
;
232 int was_aborted
= thread
->aborted
;
233 int was_valid
= thread
->state_valid
;
236 if (!was_aborted
&& was_valid
)
237 memcpy (&old_state
, &thread
->state
, sizeof (old_state
));
239 state
= proc_get_state (thread
, 1);
242 warning (_("Couldn't store registers into %s"),
243 proc_string (thread
));
247 /* Save the T bit. We might try to restore the %eflags register
248 below, but changing the T bit would seriously confuse GDB. */
249 trace
= ((struct i386_thread_state
*)state
)->efl
& 0x100;
251 if (!was_aborted
&& was_valid
)
252 /* See which registers have changed after aborting the thread. */
256 for (check_regno
= 0; check_regno
< I386_NUM_GREGS
; check_regno
++)
257 if ((thread
->fetched_regs
& (1 << check_regno
))
258 && memcpy (REG_ADDR (&old_state
, check_regno
),
259 REG_ADDR (state
, check_regno
),
260 register_size (gdbarch
, check_regno
)))
261 /* Register CHECK_REGNO has changed! Ack! */
263 warning (_("Register %s changed after the thread was aborted"),
264 gdbarch_register_name (gdbarch
, check_regno
));
265 if (regno
>= 0 && regno
!= check_regno
)
266 /* Update GDB's copy of the register. */
267 regcache_raw_supply (regcache
, check_regno
,
268 REG_ADDR (state
, check_regno
));
270 warning (_("... also writing this register! "
279 proc_debug (thread
, "storing all registers");
281 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
282 if (REG_VALID
== regcache_register_status (regcache
, i
))
283 regcache_raw_collect (regcache
, i
, REG_ADDR (state
, i
));
287 proc_debug (thread
, "storing register %s",
288 gdbarch_register_name (gdbarch
, regno
));
290 gdb_assert (REG_VALID
== regcache_register_status (regcache
, regno
));
291 regcache_raw_collect (regcache
, regno
, REG_ADDR (state
, regno
));
294 /* Restore the T bit. */
295 ((struct i386_thread_state
*)state
)->efl
&= ~0x100;
296 ((struct i386_thread_state
*)state
)->efl
|= trace
;
299 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
301 proc_debug (thread
, "storing floating-point registers");
303 store_fpregs (regcache
, thread
, regno
);
307 /* Provide a prototype to silence -Wmissing-prototypes. */
308 extern initialize_file_ftype _initialize_i386gnu_nat
;
311 _initialize_i386gnu_nat (void)
313 struct target_ops
*t
;
315 /* Fill in the generic GNU/Hurd methods. */
318 t
->to_fetch_registers
= gnu_fetch_registers
;
319 t
->to_store_registers
= gnu_store_registers
;
321 /* Register the target. */