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"
25 #include "gdb_assert.h"
30 #include <mach_error.h>
31 #include <mach/message.h>
32 #include <mach/exception.h>
34 #include "i386-tdep.h"
37 #include "i387-tdep.h"
39 #ifdef HAVE_SYS_PROCFS_H
40 # include <sys/procfs.h>
44 /* Offset to the thread_state_t location where REG is stored. */
45 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
47 /* At REG_OFFSET[N] is the offset to the thread_state_t location where
48 the GDB register N is stored. */
49 static int reg_offset
[] =
51 REG_OFFSET (eax
), REG_OFFSET (ecx
), REG_OFFSET (edx
), REG_OFFSET (ebx
),
52 REG_OFFSET (uesp
), REG_OFFSET (ebp
), REG_OFFSET (esi
), REG_OFFSET (edi
),
53 REG_OFFSET (eip
), REG_OFFSET (efl
), REG_OFFSET (cs
), REG_OFFSET (ss
),
54 REG_OFFSET (ds
), REG_OFFSET (es
), REG_OFFSET (fs
), REG_OFFSET (gs
)
57 /* Offset to the greg_t location where REG is stored. */
58 #define CREG_OFFSET(reg) (REG_##reg * 4)
60 /* At CREG_OFFSET[N] is the offset to the greg_t location where
61 the GDB register N is stored. */
62 static int creg_offset
[] =
64 CREG_OFFSET (EAX
), CREG_OFFSET (ECX
), CREG_OFFSET (EDX
), CREG_OFFSET (EBX
),
65 CREG_OFFSET (UESP
), CREG_OFFSET (EBP
), CREG_OFFSET (ESI
), CREG_OFFSET (EDI
),
66 CREG_OFFSET (EIP
), CREG_OFFSET (EFL
), CREG_OFFSET (CS
), CREG_OFFSET (SS
),
67 CREG_OFFSET (DS
), CREG_OFFSET (ES
), CREG_OFFSET (FS
), CREG_OFFSET (GS
)
70 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
71 #define CREG_ADDR(state, regnum) ((const char *)(state) + creg_offset[regnum])
74 /* Get the whole floating-point state of THREAD and record the values
75 of the corresponding (pseudo) registers. */
78 fetch_fpregs (struct regcache
*regcache
, struct proc
*thread
)
80 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
81 struct i386_float_state state
;
84 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
85 (thread_state_t
) &state
, &count
);
88 warning (_("Couldn't fetch floating-point state from %s"),
89 proc_string (thread
));
93 if (!state
.initialized
)
95 /* The floating-point state isn't initialized. */
96 i387_supply_fsave (regcache
, -1, NULL
);
100 /* Supply the floating-point registers. */
101 i387_supply_fsave (regcache
, -1, state
.hw_state
);
105 #ifdef HAVE_SYS_PROCFS_H
106 /* These two calls are used by the core-regset.c code for
107 reading ELF core files. */
109 supply_gregset (struct regcache
*regcache
, const gdb_gregset_t
*gregs
)
112 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
113 regcache_raw_supply (regcache
, i
, CREG_ADDR (gregs
, i
));
117 supply_fpregset (struct regcache
*regcache
, const gdb_fpregset_t
*fpregs
)
119 i387_supply_fsave (regcache
, -1, fpregs
);
123 /* Fetch register REGNO, or all regs if REGNO is -1. */
125 gnu_fetch_registers (struct target_ops
*ops
,
126 struct regcache
*regcache
, int regno
)
130 /* Make sure we know about new threads. */
131 inf_update_procs (gnu_current_inf
);
133 thread
= inf_tid_to_thread (gnu_current_inf
,
134 ptid_get_lwp (inferior_ptid
));
136 error (_("Can't fetch registers from thread %s: No such thread"),
137 target_pid_to_str (inferior_ptid
));
139 if (regno
< I386_NUM_GREGS
|| regno
== -1)
141 thread_state_t state
;
143 /* This does the dirty work for us. */
144 state
= proc_get_state (thread
, 0);
147 warning (_("Couldn't fetch registers from %s"),
148 proc_string (thread
));
156 proc_debug (thread
, "fetching all register");
158 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
159 regcache_raw_supply (regcache
, i
, REG_ADDR (state
, i
));
160 thread
->fetched_regs
= ~0;
164 proc_debug (thread
, "fetching register %s",
165 gdbarch_register_name (get_regcache_arch (regcache
),
168 regcache_raw_supply (regcache
, regno
,
169 REG_ADDR (state
, regno
));
170 thread
->fetched_regs
|= (1 << regno
);
174 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
176 proc_debug (thread
, "fetching floating-point registers");
178 fetch_fpregs (regcache
, thread
);
183 /* Store the whole floating-point state into THREAD using information
184 from the corresponding (pseudo) registers. */
186 store_fpregs (const struct regcache
*regcache
, struct proc
*thread
, int regno
)
188 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
189 struct i386_float_state state
;
192 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
193 (thread_state_t
) &state
, &count
);
196 warning (_("Couldn't fetch floating-point state from %s"),
197 proc_string (thread
));
201 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
202 take into account DEPRECATED_REGISTER_VALID like the old code did? */
203 i387_collect_fsave (regcache
, regno
, state
.hw_state
);
205 err
= thread_set_state (thread
->port
, i386_FLOAT_STATE
,
206 (thread_state_t
) &state
, i386_FLOAT_STATE_COUNT
);
209 warning (_("Couldn't store floating-point state into %s"),
210 proc_string (thread
));
215 /* Store at least register REGNO, or all regs if REGNO == -1. */
217 gnu_store_registers (struct target_ops
*ops
,
218 struct regcache
*regcache
, int regno
)
221 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
223 /* Make sure we know about new threads. */
224 inf_update_procs (gnu_current_inf
);
226 thread
= inf_tid_to_thread (gnu_current_inf
,
227 ptid_get_lwp (inferior_ptid
));
229 error (_("Couldn't store registers into thread %s: No such thread"),
230 target_pid_to_str (inferior_ptid
));
232 if (regno
< I386_NUM_GREGS
|| regno
== -1)
234 thread_state_t state
;
235 thread_state_data_t old_state
;
236 int was_aborted
= thread
->aborted
;
237 int was_valid
= thread
->state_valid
;
240 if (!was_aborted
&& was_valid
)
241 memcpy (&old_state
, &thread
->state
, sizeof (old_state
));
243 state
= proc_get_state (thread
, 1);
246 warning (_("Couldn't store registers into %s"),
247 proc_string (thread
));
251 /* Save the T bit. We might try to restore the %eflags register
252 below, but changing the T bit would seriously confuse GDB. */
253 trace
= ((struct i386_thread_state
*)state
)->efl
& 0x100;
255 if (!was_aborted
&& was_valid
)
256 /* See which registers have changed after aborting the thread. */
260 for (check_regno
= 0; check_regno
< I386_NUM_GREGS
; check_regno
++)
261 if ((thread
->fetched_regs
& (1 << check_regno
))
262 && memcpy (REG_ADDR (&old_state
, check_regno
),
263 REG_ADDR (state
, check_regno
),
264 register_size (gdbarch
, check_regno
)))
265 /* Register CHECK_REGNO has changed! Ack! */
267 warning (_("Register %s changed after the thread was aborted"),
268 gdbarch_register_name (gdbarch
, check_regno
));
269 if (regno
>= 0 && regno
!= check_regno
)
270 /* Update GDB's copy of the register. */
271 regcache_raw_supply (regcache
, check_regno
,
272 REG_ADDR (state
, check_regno
));
274 warning (_("... also writing this register! "
283 proc_debug (thread
, "storing all registers");
285 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
286 if (REG_VALID
== regcache_register_status (regcache
, i
))
287 regcache_raw_collect (regcache
, i
, REG_ADDR (state
, i
));
291 proc_debug (thread
, "storing register %s",
292 gdbarch_register_name (gdbarch
, regno
));
294 gdb_assert (REG_VALID
== regcache_register_status (regcache
, regno
));
295 regcache_raw_collect (regcache
, regno
, REG_ADDR (state
, regno
));
298 /* Restore the T bit. */
299 ((struct i386_thread_state
*)state
)->efl
&= ~0x100;
300 ((struct i386_thread_state
*)state
)->efl
|= trace
;
303 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
305 proc_debug (thread
, "storing floating-point registers");
307 store_fpregs (regcache
, thread
, regno
);
311 /* Provide a prototype to silence -Wmissing-prototypes. */
312 extern initialize_file_ftype _initialize_i386gnu_nat
;
315 _initialize_i386gnu_nat (void)
317 struct target_ops
*t
;
319 /* Fill in the generic GNU/Hurd methods. */
322 t
->to_fetch_registers
= gnu_fetch_registers
;
323 t
->to_store_registers
= gnu_store_registers
;
325 /* Register the target. */