1 /* Copyright (C) 2007-2017 Free Software Foundation, Inc.
3 This file is part of GDB.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 #include "win32-low.h"
22 #ifndef CONTEXT_EXTENDED_REGISTERS
23 #define CONTEXT_EXTENDED_REGISTERS 0
29 #define FLAG_TRACE_BIT 0x100
32 /* Defined in auto-generated build-time file gdb/gdbserver/amd64.c. */
33 void init_registers_amd64 (void);
34 extern const struct target_desc
*tdesc_amd64
;
36 /* Defined in auto-generated build-time file gdb/gdbserver/i386.c. */
37 void init_registers_i386 (void);
38 extern const struct target_desc
*tdesc_i386
;
41 static struct x86_debug_reg_state debug_reg_state
;
44 update_debug_registers_callback (struct inferior_list_entry
*entry
,
47 struct thread_info
*thr
= (struct thread_info
*) entry
;
48 win32_thread_info
*th
= (win32_thread_info
*) inferior_target_data (thr
);
49 int pid
= *(int *) pid_p
;
51 /* Only update the threads of this process. */
52 if (pid_of (thr
) == pid
)
54 /* The actual update is done later just before resuming the lwp,
55 we just mark that the registers need updating. */
56 th
->debug_registers_changed
= 1;
62 /* Update the inferior's debug register REGNUM from STATE. */
65 x86_dr_low_set_addr (int regnum
, CORE_ADDR addr
)
67 /* Only update the threads of this process. */
68 int pid
= pid_of (current_thread
);
70 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
72 find_inferior (&all_threads
, update_debug_registers_callback
, &pid
);
75 /* Update the inferior's DR7 debug control register from STATE. */
78 x86_dr_low_set_control (unsigned long control
)
80 /* Only update the threads of this process. */
81 int pid
= pid_of (current_thread
);
83 find_inferior (&all_threads
, update_debug_registers_callback
, &pid
);
86 /* Return the current value of a DR register of the current thread's
90 win32_get_current_dr (int dr
)
93 = (win32_thread_info
*) inferior_target_data (current_thread
);
95 win32_require_context (th
);
99 return th->context.Dr ## DR
113 gdb_assert_not_reached ("unhandled dr");
117 x86_dr_low_get_addr (int regnum
)
119 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
121 return win32_get_current_dr (regnum
- DR_FIRSTADDR
);
125 x86_dr_low_get_control (void)
127 return win32_get_current_dr (7);
130 /* Get the value of the DR6 debug status register from the inferior
131 and record it in STATE. */
134 x86_dr_low_get_status (void)
136 return win32_get_current_dr (6);
139 /* Low-level function vector. */
140 struct x86_dr_low_type x86_dr_low
=
142 x86_dr_low_set_control
,
145 x86_dr_low_get_status
,
146 x86_dr_low_get_control
,
150 /* Breakpoint/watchpoint support. */
153 i386_supports_z_point_type (char z_type
)
157 case Z_PACKET_WRITE_WP
:
158 case Z_PACKET_ACCESS_WP
:
166 i386_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
167 int size
, struct raw_breakpoint
*bp
)
171 case raw_bkpt_type_write_wp
:
172 case raw_bkpt_type_access_wp
:
174 enum target_hw_bp_type hw_type
175 = raw_bkpt_type_to_target_hw_bp_type (type
);
177 return x86_dr_insert_watchpoint (&debug_reg_state
,
178 hw_type
, addr
, size
);
187 i386_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
188 int size
, struct raw_breakpoint
*bp
)
192 case raw_bkpt_type_write_wp
:
193 case raw_bkpt_type_access_wp
:
195 enum target_hw_bp_type hw_type
196 = raw_bkpt_type_to_target_hw_bp_type (type
);
198 return x86_dr_remove_watchpoint (&debug_reg_state
,
199 hw_type
, addr
, size
);
208 x86_stopped_by_watchpoint (void)
210 return x86_dr_stopped_by_watchpoint (&debug_reg_state
);
214 x86_stopped_data_address (void)
217 if (x86_dr_stopped_data_address (&debug_reg_state
, &addr
))
223 i386_initial_stuff (void)
225 x86_low_init_dregs (&debug_reg_state
);
229 i386_get_thread_context (win32_thread_info
*th
)
231 /* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
232 the system doesn't support extended registers. */
233 static DWORD extended_registers
= CONTEXT_EXTENDED_REGISTERS
;
236 th
->context
.ContextFlags
= (CONTEXT_FULL
237 | CONTEXT_FLOATING_POINT
238 | CONTEXT_DEBUG_REGISTERS
239 | extended_registers
);
241 if (!GetThreadContext (th
->h
, &th
->context
))
243 DWORD e
= GetLastError ();
245 if (extended_registers
&& e
== ERROR_INVALID_PARAMETER
)
247 extended_registers
= 0;
251 error ("GetThreadContext failure %ld\n", (long) e
);
256 i386_prepare_to_resume (win32_thread_info
*th
)
258 if (th
->debug_registers_changed
)
260 struct x86_debug_reg_state
*dr
= &debug_reg_state
;
262 win32_require_context (th
);
264 th
->context
.Dr0
= dr
->dr_mirror
[0];
265 th
->context
.Dr1
= dr
->dr_mirror
[1];
266 th
->context
.Dr2
= dr
->dr_mirror
[2];
267 th
->context
.Dr3
= dr
->dr_mirror
[3];
268 /* th->context.Dr6 = dr->dr_status_mirror;
269 FIXME: should we set dr6 also ?? */
270 th
->context
.Dr7
= dr
->dr_control_mirror
;
272 th
->debug_registers_changed
= 0;
277 i386_thread_added (win32_thread_info
*th
)
279 th
->debug_registers_changed
= 1;
283 i386_single_step (win32_thread_info
*th
)
285 th
->context
.EFlags
|= FLAG_TRACE_BIT
;
290 /* An array of offset mappings into a Win32 Context structure.
291 This is a one-to-one mapping which is indexed by gdb's register
292 numbers. It retrieves an offset into the context structure where
293 the 4 byte register is located.
294 An offset value of -1 indicates that Win32 does not provide this
295 register in it's CONTEXT structure. In this case regptr will return
296 a pointer into a dummy register. */
297 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
298 static const int mappings
[] = {
299 context_offset (Eax
),
300 context_offset (Ecx
),
301 context_offset (Edx
),
302 context_offset (Ebx
),
303 context_offset (Esp
),
304 context_offset (Ebp
),
305 context_offset (Esi
),
306 context_offset (Edi
),
307 context_offset (Eip
),
308 context_offset (EFlags
),
309 context_offset (SegCs
),
310 context_offset (SegSs
),
311 context_offset (SegDs
),
312 context_offset (SegEs
),
313 context_offset (SegFs
),
314 context_offset (SegGs
),
315 context_offset (FloatSave
.RegisterArea
[0 * 10]),
316 context_offset (FloatSave
.RegisterArea
[1 * 10]),
317 context_offset (FloatSave
.RegisterArea
[2 * 10]),
318 context_offset (FloatSave
.RegisterArea
[3 * 10]),
319 context_offset (FloatSave
.RegisterArea
[4 * 10]),
320 context_offset (FloatSave
.RegisterArea
[5 * 10]),
321 context_offset (FloatSave
.RegisterArea
[6 * 10]),
322 context_offset (FloatSave
.RegisterArea
[7 * 10]),
323 context_offset (FloatSave
.ControlWord
),
324 context_offset (FloatSave
.StatusWord
),
325 context_offset (FloatSave
.TagWord
),
326 context_offset (FloatSave
.ErrorSelector
),
327 context_offset (FloatSave
.ErrorOffset
),
328 context_offset (FloatSave
.DataSelector
),
329 context_offset (FloatSave
.DataOffset
),
330 context_offset (FloatSave
.ErrorSelector
),
332 context_offset (ExtendedRegisters
[10 * 16]),
333 context_offset (ExtendedRegisters
[11 * 16]),
334 context_offset (ExtendedRegisters
[12 * 16]),
335 context_offset (ExtendedRegisters
[13 * 16]),
336 context_offset (ExtendedRegisters
[14 * 16]),
337 context_offset (ExtendedRegisters
[15 * 16]),
338 context_offset (ExtendedRegisters
[16 * 16]),
339 context_offset (ExtendedRegisters
[17 * 16]),
341 context_offset (ExtendedRegisters
[24])
343 #undef context_offset
345 #else /* __x86_64__ */
347 #define context_offset(x) (offsetof (CONTEXT, x))
348 static const int mappings
[] =
350 context_offset (Rax
),
351 context_offset (Rbx
),
352 context_offset (Rcx
),
353 context_offset (Rdx
),
354 context_offset (Rsi
),
355 context_offset (Rdi
),
356 context_offset (Rbp
),
357 context_offset (Rsp
),
360 context_offset (R10
),
361 context_offset (R11
),
362 context_offset (R12
),
363 context_offset (R13
),
364 context_offset (R14
),
365 context_offset (R15
),
366 context_offset (Rip
),
367 context_offset (EFlags
),
368 context_offset (SegCs
),
369 context_offset (SegSs
),
370 context_offset (SegDs
),
371 context_offset (SegEs
),
372 context_offset (SegFs
),
373 context_offset (SegGs
),
374 context_offset (FloatSave
.FloatRegisters
[0]),
375 context_offset (FloatSave
.FloatRegisters
[1]),
376 context_offset (FloatSave
.FloatRegisters
[2]),
377 context_offset (FloatSave
.FloatRegisters
[3]),
378 context_offset (FloatSave
.FloatRegisters
[4]),
379 context_offset (FloatSave
.FloatRegisters
[5]),
380 context_offset (FloatSave
.FloatRegisters
[6]),
381 context_offset (FloatSave
.FloatRegisters
[7]),
382 context_offset (FloatSave
.ControlWord
),
383 context_offset (FloatSave
.StatusWord
),
384 context_offset (FloatSave
.TagWord
),
385 context_offset (FloatSave
.ErrorSelector
),
386 context_offset (FloatSave
.ErrorOffset
),
387 context_offset (FloatSave
.DataSelector
),
388 context_offset (FloatSave
.DataOffset
),
389 context_offset (FloatSave
.ErrorSelector
)
391 context_offset (Xmm0
),
392 context_offset (Xmm1
),
393 context_offset (Xmm2
),
394 context_offset (Xmm3
),
395 context_offset (Xmm4
),
396 context_offset (Xmm5
),
397 context_offset (Xmm6
),
398 context_offset (Xmm7
),
399 context_offset (Xmm8
),
400 context_offset (Xmm9
),
401 context_offset (Xmm10
),
402 context_offset (Xmm11
),
403 context_offset (Xmm12
),
404 context_offset (Xmm13
),
405 context_offset (Xmm14
),
406 context_offset (Xmm15
),
408 context_offset (FloatSave
.MxCsr
)
410 #undef context_offset
412 #endif /* __x86_64__ */
414 /* Fetch register from gdbserver regcache data. */
416 i386_fetch_inferior_register (struct regcache
*regcache
,
417 win32_thread_info
*th
, int r
)
419 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
424 l
= *((long *) context_offset
) & 0xffff;
425 supply_register (regcache
, r
, (char *) &l
);
427 else if (r
== FOP_REGNUM
)
429 l
= (*((long *) context_offset
) >> 16) & ((1 << 11) - 1);
430 supply_register (regcache
, r
, (char *) &l
);
433 supply_register (regcache
, r
, context_offset
);
436 /* Store a new register value into the thread context of TH. */
438 i386_store_inferior_register (struct regcache
*regcache
,
439 win32_thread_info
*th
, int r
)
441 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
442 collect_register (regcache
, r
, context_offset
);
445 static const unsigned char i386_win32_breakpoint
= 0xcc;
446 #define i386_win32_breakpoint_len 1
449 i386_arch_setup (void)
452 init_registers_amd64 ();
453 win32_tdesc
= tdesc_amd64
;
455 init_registers_i386 ();
456 win32_tdesc
= tdesc_i386
;
460 struct win32_target_ops the_low_target
= {
462 sizeof (mappings
) / sizeof (mappings
[0]),
464 i386_get_thread_context
,
465 i386_prepare_to_resume
,
467 i386_fetch_inferior_register
,
468 i386_store_inferior_register
,
470 &i386_win32_breakpoint
,
471 i386_win32_breakpoint_len
,
472 i386_supports_z_point_type
,
475 x86_stopped_by_watchpoint
,
476 x86_stopped_data_address