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/>. */
23 #include "floatformat.h"
27 #include <mach_error.h>
28 #include <mach/message.h>
29 #include <mach/exception.h>
31 #include "i386-tdep.h"
34 #include "inf-child.h"
35 #include "i387-tdep.h"
37 #ifdef HAVE_SYS_PROCFS_H
38 # include <sys/procfs.h>
42 /* Offset to the thread_state_t location where REG is stored. */
43 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
45 /* At REG_OFFSET[N] is the offset to the thread_state_t location where
46 the GDB register N is stored. */
47 static int reg_offset
[] =
49 REG_OFFSET (eax
), REG_OFFSET (ecx
), REG_OFFSET (edx
), REG_OFFSET (ebx
),
50 REG_OFFSET (uesp
), REG_OFFSET (ebp
), REG_OFFSET (esi
), REG_OFFSET (edi
),
51 REG_OFFSET (eip
), REG_OFFSET (efl
), REG_OFFSET (cs
), REG_OFFSET (ss
),
52 REG_OFFSET (ds
), REG_OFFSET (es
), REG_OFFSET (fs
), REG_OFFSET (gs
)
55 /* Offset to the greg_t location where REG is stored. */
56 #define CREG_OFFSET(reg) (REG_##reg * 4)
58 /* At CREG_OFFSET[N] is the offset to the greg_t location where
59 the GDB register N is stored. */
60 static int creg_offset
[] =
62 CREG_OFFSET (EAX
), CREG_OFFSET (ECX
), CREG_OFFSET (EDX
), CREG_OFFSET (EBX
),
63 CREG_OFFSET (UESP
), CREG_OFFSET (EBP
), CREG_OFFSET (ESI
), CREG_OFFSET (EDI
),
64 CREG_OFFSET (EIP
), CREG_OFFSET (EFL
), CREG_OFFSET (CS
), CREG_OFFSET (SS
),
65 CREG_OFFSET (DS
), CREG_OFFSET (ES
), CREG_OFFSET (FS
), CREG_OFFSET (GS
)
68 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
69 #define CREG_ADDR(state, regnum) ((const char *)(state) + creg_offset[regnum])
72 /* Get the whole floating-point state of THREAD and record the values
73 of the corresponding (pseudo) registers. */
76 fetch_fpregs (struct regcache
*regcache
, struct proc
*thread
)
78 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
79 struct i386_float_state state
;
82 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
83 (thread_state_t
) &state
, &count
);
86 warning (_("Couldn't fetch floating-point state from %s"),
87 proc_string (thread
));
91 if (!state
.initialized
)
93 /* The floating-point state isn't initialized. */
94 i387_supply_fsave (regcache
, -1, NULL
);
98 /* Supply the floating-point registers. */
99 i387_supply_fsave (regcache
, -1, state
.hw_state
);
103 #ifdef HAVE_SYS_PROCFS_H
104 /* These two calls are used by the core-regset.c code for
105 reading ELF core files. */
107 supply_gregset (struct regcache
*regcache
, const gdb_gregset_t
*gregs
)
110 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
111 regcache_raw_supply (regcache
, i
, CREG_ADDR (gregs
, i
));
115 supply_fpregset (struct regcache
*regcache
, const gdb_fpregset_t
*fpregs
)
117 i387_supply_fsave (regcache
, -1, fpregs
);
121 /* Fetch register REGNO, or all regs if REGNO is -1. */
123 gnu_fetch_registers (struct target_ops
*ops
,
124 struct regcache
*regcache
, int regno
)
128 /* Make sure we know about new threads. */
129 inf_update_procs (gnu_current_inf
);
131 thread
= inf_tid_to_thread (gnu_current_inf
,
132 ptid_get_lwp (inferior_ptid
));
134 error (_("Can't fetch registers from thread %s: No such thread"),
135 target_pid_to_str (inferior_ptid
));
137 if (regno
< I386_NUM_GREGS
|| regno
== -1)
139 thread_state_t state
;
141 /* This does the dirty work for us. */
142 state
= proc_get_state (thread
, 0);
145 warning (_("Couldn't fetch registers from %s"),
146 proc_string (thread
));
154 proc_debug (thread
, "fetching all register");
156 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
157 regcache_raw_supply (regcache
, i
, REG_ADDR (state
, i
));
158 thread
->fetched_regs
= ~0;
162 proc_debug (thread
, "fetching register %s",
163 gdbarch_register_name (get_regcache_arch (regcache
),
166 regcache_raw_supply (regcache
, regno
,
167 REG_ADDR (state
, regno
));
168 thread
->fetched_regs
|= (1 << regno
);
172 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
174 proc_debug (thread
, "fetching floating-point registers");
176 fetch_fpregs (regcache
, thread
);
181 /* Store the whole floating-point state into THREAD using information
182 from the corresponding (pseudo) registers. */
184 store_fpregs (const struct regcache
*regcache
, struct proc
*thread
, int regno
)
186 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
187 struct i386_float_state state
;
190 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
191 (thread_state_t
) &state
, &count
);
194 warning (_("Couldn't fetch floating-point state from %s"),
195 proc_string (thread
));
199 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
200 take into account DEPRECATED_REGISTER_VALID like the old code did? */
201 i387_collect_fsave (regcache
, regno
, state
.hw_state
);
203 err
= thread_set_state (thread
->port
, i386_FLOAT_STATE
,
204 (thread_state_t
) &state
, i386_FLOAT_STATE_COUNT
);
207 warning (_("Couldn't store floating-point state into %s"),
208 proc_string (thread
));
213 /* Store at least register REGNO, or all regs if REGNO == -1. */
215 gnu_store_registers (struct target_ops
*ops
,
216 struct regcache
*regcache
, int regno
)
219 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
221 /* Make sure we know about new threads. */
222 inf_update_procs (gnu_current_inf
);
224 thread
= inf_tid_to_thread (gnu_current_inf
,
225 ptid_get_lwp (inferior_ptid
));
227 error (_("Couldn't store registers into thread %s: No such thread"),
228 target_pid_to_str (inferior_ptid
));
230 if (regno
< I386_NUM_GREGS
|| regno
== -1)
232 thread_state_t state
;
233 thread_state_data_t old_state
;
234 int was_aborted
= thread
->aborted
;
235 int was_valid
= thread
->state_valid
;
238 if (!was_aborted
&& was_valid
)
239 memcpy (&old_state
, &thread
->state
, sizeof (old_state
));
241 state
= proc_get_state (thread
, 1);
244 warning (_("Couldn't store registers into %s"),
245 proc_string (thread
));
249 /* Save the T bit. We might try to restore the %eflags register
250 below, but changing the T bit would seriously confuse GDB. */
251 trace
= ((struct i386_thread_state
*)state
)->efl
& 0x100;
253 if (!was_aborted
&& was_valid
)
254 /* See which registers have changed after aborting the thread. */
258 for (check_regno
= 0; check_regno
< I386_NUM_GREGS
; check_regno
++)
259 if ((thread
->fetched_regs
& (1 << check_regno
))
260 && memcpy (REG_ADDR (&old_state
, check_regno
),
261 REG_ADDR (state
, check_regno
),
262 register_size (gdbarch
, check_regno
)))
263 /* Register CHECK_REGNO has changed! Ack! */
265 warning (_("Register %s changed after the thread was aborted"),
266 gdbarch_register_name (gdbarch
, check_regno
));
267 if (regno
>= 0 && regno
!= check_regno
)
268 /* Update GDB's copy of the register. */
269 regcache_raw_supply (regcache
, check_regno
,
270 REG_ADDR (state
, check_regno
));
272 warning (_("... also writing this register! "
281 proc_debug (thread
, "storing all registers");
283 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
284 if (REG_VALID
== regcache_register_status (regcache
, i
))
285 regcache_raw_collect (regcache
, i
, REG_ADDR (state
, i
));
289 proc_debug (thread
, "storing register %s",
290 gdbarch_register_name (gdbarch
, regno
));
292 gdb_assert (REG_VALID
== regcache_register_status (regcache
, regno
));
293 regcache_raw_collect (regcache
, regno
, REG_ADDR (state
, regno
));
296 /* Restore the T bit. */
297 ((struct i386_thread_state
*)state
)->efl
&= ~0x100;
298 ((struct i386_thread_state
*)state
)->efl
|= trace
;
301 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
303 proc_debug (thread
, "storing floating-point registers");
305 store_fpregs (regcache
, thread
, regno
);
310 /* Support for debug registers. */
312 #ifdef i386_DEBUG_STATE
313 /* Get debug registers for thread THREAD. */
316 i386_gnu_dr_get (struct i386_debug_state
*regs
, struct proc
*thread
)
318 mach_msg_type_number_t count
= i386_DEBUG_STATE_COUNT
;
321 err
= thread_get_state (thread
->port
, i386_DEBUG_STATE
,
322 (thread_state_t
) regs
, &count
);
323 if (err
!= 0 || count
!= i386_DEBUG_STATE_COUNT
)
324 warning (_("Couldn't fetch debug state from %s"),
325 proc_string (thread
));
328 /* Set debug registers for thread THREAD. */
331 i386_gnu_dr_set (const struct i386_debug_state
*regs
, struct proc
*thread
)
335 err
= thread_set_state (thread
->port
, i386_DEBUG_STATE
,
336 (thread_state_t
) regs
, i386_DEBUG_STATE_COUNT
);
338 warning (_("Couldn't store debug state into %s"),
339 proc_string (thread
));
342 /* Set DR_CONTROL in THREAD. */
345 i386_gnu_dr_set_control_one (struct proc
*thread
, void *arg
)
347 unsigned long *control
= arg
;
348 struct i386_debug_state regs
;
350 i386_gnu_dr_get (®s
, thread
);
351 regs
.dr
[DR_CONTROL
] = *control
;
352 i386_gnu_dr_set (®s
, thread
);
355 /* Set DR_CONTROL to CONTROL in all threads. */
358 i386_gnu_dr_set_control (unsigned long control
)
360 inf_update_procs (gnu_current_inf
);
361 inf_threads (gnu_current_inf
, i386_gnu_dr_set_control_one
, &control
);
364 /* Parameters to set a debugging address. */
368 int regnum
; /* Register number (zero based). */
369 CORE_ADDR addr
; /* Address. */
372 /* Set address REGNUM (zero based) to ADDR in THREAD. */
375 i386_gnu_dr_set_addr_one (struct proc
*thread
, void *arg
)
377 struct reg_addr
*reg_addr
= arg
;
378 struct i386_debug_state regs
;
380 i386_gnu_dr_get (®s
, thread
);
381 regs
.dr
[reg_addr
->regnum
] = reg_addr
->addr
;
382 i386_gnu_dr_set (®s
, thread
);
385 /* Set address REGNUM (zero based) to ADDR in all threads. */
388 i386_gnu_dr_set_addr (int regnum
, CORE_ADDR addr
)
390 struct reg_addr reg_addr
;
392 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
394 reg_addr
.regnum
= regnum
;
395 reg_addr
.addr
= addr
;
397 inf_update_procs (gnu_current_inf
);
398 inf_threads (gnu_current_inf
, i386_gnu_dr_set_addr_one
, ®_addr
);
401 /* Get debug register REGNUM value from only the one LWP of PTID. */
404 i386_gnu_dr_get_reg (ptid_t ptid
, int regnum
)
406 struct i386_debug_state regs
;
409 /* Make sure we know about new threads. */
410 inf_update_procs (gnu_current_inf
);
412 thread
= inf_tid_to_thread (gnu_current_inf
, ptid_get_lwp (ptid
));
413 i386_gnu_dr_get (®s
, thread
);
415 return regs
.dr
[regnum
];
418 /* Return the inferior's debug register REGNUM. */
421 i386_gnu_dr_get_addr (int regnum
)
423 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
425 return i386_gnu_dr_get_reg (inferior_ptid
, regnum
);
428 /* Get DR_STATUS from only the one thread of INFERIOR_PTID. */
431 i386_gnu_dr_get_status (void)
433 return i386_gnu_dr_get_reg (inferior_ptid
, DR_STATUS
);
436 /* Return the inferior's DR7 debug control register. */
439 i386_gnu_dr_get_control (void)
441 return i386_gnu_dr_get_reg (inferior_ptid
, DR_CONTROL
);
443 #endif /* i386_DEBUG_STATE */
445 /* Provide a prototype to silence -Wmissing-prototypes. */
446 extern initialize_file_ftype _initialize_i386gnu_nat
;
449 _initialize_i386gnu_nat (void)
451 struct target_ops
*t
;
453 /* Fill in the generic GNU/Hurd methods. */
456 #ifdef i386_DEBUG_STATE
457 x86_use_watchpoints (t
);
459 x86_dr_low
.set_control
= i386_gnu_dr_set_control
;
460 gdb_assert (DR_FIRSTADDR
== 0 && DR_LASTADDR
< i386_DEBUG_STATE_COUNT
);
461 x86_dr_low
.set_addr
= i386_gnu_dr_set_addr
;
462 x86_dr_low
.get_addr
= i386_gnu_dr_get_addr
;
463 x86_dr_low
.get_status
= i386_gnu_dr_get_status
;
464 x86_dr_low
.get_control
= i386_gnu_dr_get_control
;
465 x86_set_debug_register_length (4);
466 #endif /* i386_DEBUG_STATE */
468 t
->to_fetch_registers
= gnu_fetch_registers
;
469 t
->to_store_registers
= gnu_store_registers
;
471 /* Register the target. */