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"
21 #include "x86-xstate.h"
23 #include "arch/amd64.h"
25 #include "arch/i386.h"
28 #ifndef CONTEXT_EXTENDED_REGISTERS
29 #define CONTEXT_EXTENDED_REGISTERS 0
35 #define FLAG_TRACE_BIT 0x100
37 static struct x86_debug_reg_state debug_reg_state
;
40 update_debug_registers_callback (struct inferior_list_entry
*entry
,
43 struct thread_info
*thr
= (struct thread_info
*) entry
;
44 win32_thread_info
*th
= (win32_thread_info
*) thread_target_data (thr
);
45 int pid
= *(int *) pid_p
;
47 /* Only update the threads of this process. */
48 if (pid_of (thr
) == pid
)
50 /* The actual update is done later just before resuming the lwp,
51 we just mark that the registers need updating. */
52 th
->debug_registers_changed
= 1;
58 /* Update the inferior's debug register REGNUM from STATE. */
61 x86_dr_low_set_addr (int regnum
, CORE_ADDR addr
)
63 /* Only update the threads of this process. */
64 int pid
= pid_of (current_thread
);
66 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
68 find_inferior (&all_threads
, update_debug_registers_callback
, &pid
);
71 /* Update the inferior's DR7 debug control register from STATE. */
74 x86_dr_low_set_control (unsigned long control
)
76 /* Only update the threads of this process. */
77 int pid
= pid_of (current_thread
);
79 find_inferior (&all_threads
, update_debug_registers_callback
, &pid
);
82 /* Return the current value of a DR register of the current thread's
86 win32_get_current_dr (int dr
)
89 = (win32_thread_info
*) thread_target_data (current_thread
);
91 win32_require_context (th
);
95 return th->context.Dr ## DR
109 gdb_assert_not_reached ("unhandled dr");
113 x86_dr_low_get_addr (int regnum
)
115 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
117 return win32_get_current_dr (regnum
- DR_FIRSTADDR
);
121 x86_dr_low_get_control (void)
123 return win32_get_current_dr (7);
126 /* Get the value of the DR6 debug status register from the inferior
127 and record it in STATE. */
130 x86_dr_low_get_status (void)
132 return win32_get_current_dr (6);
135 /* Low-level function vector. */
136 struct x86_dr_low_type x86_dr_low
=
138 x86_dr_low_set_control
,
141 x86_dr_low_get_status
,
142 x86_dr_low_get_control
,
146 /* Breakpoint/watchpoint support. */
149 i386_supports_z_point_type (char z_type
)
153 case Z_PACKET_WRITE_WP
:
154 case Z_PACKET_ACCESS_WP
:
162 i386_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
163 int size
, struct raw_breakpoint
*bp
)
167 case raw_bkpt_type_write_wp
:
168 case raw_bkpt_type_access_wp
:
170 enum target_hw_bp_type hw_type
171 = raw_bkpt_type_to_target_hw_bp_type (type
);
173 return x86_dr_insert_watchpoint (&debug_reg_state
,
174 hw_type
, addr
, size
);
183 i386_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
184 int size
, struct raw_breakpoint
*bp
)
188 case raw_bkpt_type_write_wp
:
189 case raw_bkpt_type_access_wp
:
191 enum target_hw_bp_type hw_type
192 = raw_bkpt_type_to_target_hw_bp_type (type
);
194 return x86_dr_remove_watchpoint (&debug_reg_state
,
195 hw_type
, addr
, size
);
204 x86_stopped_by_watchpoint (void)
206 return x86_dr_stopped_by_watchpoint (&debug_reg_state
);
210 x86_stopped_data_address (void)
213 if (x86_dr_stopped_data_address (&debug_reg_state
, &addr
))
219 i386_initial_stuff (void)
221 x86_low_init_dregs (&debug_reg_state
);
225 i386_get_thread_context (win32_thread_info
*th
)
227 /* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
228 the system doesn't support extended registers. */
229 static DWORD extended_registers
= CONTEXT_EXTENDED_REGISTERS
;
232 th
->context
.ContextFlags
= (CONTEXT_FULL
233 | CONTEXT_FLOATING_POINT
234 | CONTEXT_DEBUG_REGISTERS
235 | extended_registers
);
237 if (!GetThreadContext (th
->h
, &th
->context
))
239 DWORD e
= GetLastError ();
241 if (extended_registers
&& e
== ERROR_INVALID_PARAMETER
)
243 extended_registers
= 0;
247 error ("GetThreadContext failure %ld\n", (long) e
);
252 i386_prepare_to_resume (win32_thread_info
*th
)
254 if (th
->debug_registers_changed
)
256 struct x86_debug_reg_state
*dr
= &debug_reg_state
;
258 win32_require_context (th
);
260 th
->context
.Dr0
= dr
->dr_mirror
[0];
261 th
->context
.Dr1
= dr
->dr_mirror
[1];
262 th
->context
.Dr2
= dr
->dr_mirror
[2];
263 th
->context
.Dr3
= dr
->dr_mirror
[3];
264 /* th->context.Dr6 = dr->dr_status_mirror;
265 FIXME: should we set dr6 also ?? */
266 th
->context
.Dr7
= dr
->dr_control_mirror
;
268 th
->debug_registers_changed
= 0;
273 i386_thread_added (win32_thread_info
*th
)
275 th
->debug_registers_changed
= 1;
279 i386_single_step (win32_thread_info
*th
)
281 th
->context
.EFlags
|= FLAG_TRACE_BIT
;
286 /* An array of offset mappings into a Win32 Context structure.
287 This is a one-to-one mapping which is indexed by gdb's register
288 numbers. It retrieves an offset into the context structure where
289 the 4 byte register is located.
290 An offset value of -1 indicates that Win32 does not provide this
291 register in it's CONTEXT structure. In this case regptr will return
292 a pointer into a dummy register. */
293 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
294 static const int mappings
[] = {
295 context_offset (Eax
),
296 context_offset (Ecx
),
297 context_offset (Edx
),
298 context_offset (Ebx
),
299 context_offset (Esp
),
300 context_offset (Ebp
),
301 context_offset (Esi
),
302 context_offset (Edi
),
303 context_offset (Eip
),
304 context_offset (EFlags
),
305 context_offset (SegCs
),
306 context_offset (SegSs
),
307 context_offset (SegDs
),
308 context_offset (SegEs
),
309 context_offset (SegFs
),
310 context_offset (SegGs
),
311 context_offset (FloatSave
.RegisterArea
[0 * 10]),
312 context_offset (FloatSave
.RegisterArea
[1 * 10]),
313 context_offset (FloatSave
.RegisterArea
[2 * 10]),
314 context_offset (FloatSave
.RegisterArea
[3 * 10]),
315 context_offset (FloatSave
.RegisterArea
[4 * 10]),
316 context_offset (FloatSave
.RegisterArea
[5 * 10]),
317 context_offset (FloatSave
.RegisterArea
[6 * 10]),
318 context_offset (FloatSave
.RegisterArea
[7 * 10]),
319 context_offset (FloatSave
.ControlWord
),
320 context_offset (FloatSave
.StatusWord
),
321 context_offset (FloatSave
.TagWord
),
322 context_offset (FloatSave
.ErrorSelector
),
323 context_offset (FloatSave
.ErrorOffset
),
324 context_offset (FloatSave
.DataSelector
),
325 context_offset (FloatSave
.DataOffset
),
326 context_offset (FloatSave
.ErrorSelector
),
328 context_offset (ExtendedRegisters
[10 * 16]),
329 context_offset (ExtendedRegisters
[11 * 16]),
330 context_offset (ExtendedRegisters
[12 * 16]),
331 context_offset (ExtendedRegisters
[13 * 16]),
332 context_offset (ExtendedRegisters
[14 * 16]),
333 context_offset (ExtendedRegisters
[15 * 16]),
334 context_offset (ExtendedRegisters
[16 * 16]),
335 context_offset (ExtendedRegisters
[17 * 16]),
337 context_offset (ExtendedRegisters
[24])
339 #undef context_offset
341 #else /* __x86_64__ */
343 #define context_offset(x) (offsetof (CONTEXT, x))
344 static const int mappings
[] =
346 context_offset (Rax
),
347 context_offset (Rbx
),
348 context_offset (Rcx
),
349 context_offset (Rdx
),
350 context_offset (Rsi
),
351 context_offset (Rdi
),
352 context_offset (Rbp
),
353 context_offset (Rsp
),
356 context_offset (R10
),
357 context_offset (R11
),
358 context_offset (R12
),
359 context_offset (R13
),
360 context_offset (R14
),
361 context_offset (R15
),
362 context_offset (Rip
),
363 context_offset (EFlags
),
364 context_offset (SegCs
),
365 context_offset (SegSs
),
366 context_offset (SegDs
),
367 context_offset (SegEs
),
368 context_offset (SegFs
),
369 context_offset (SegGs
),
370 context_offset (FloatSave
.FloatRegisters
[0]),
371 context_offset (FloatSave
.FloatRegisters
[1]),
372 context_offset (FloatSave
.FloatRegisters
[2]),
373 context_offset (FloatSave
.FloatRegisters
[3]),
374 context_offset (FloatSave
.FloatRegisters
[4]),
375 context_offset (FloatSave
.FloatRegisters
[5]),
376 context_offset (FloatSave
.FloatRegisters
[6]),
377 context_offset (FloatSave
.FloatRegisters
[7]),
378 context_offset (FloatSave
.ControlWord
),
379 context_offset (FloatSave
.StatusWord
),
380 context_offset (FloatSave
.TagWord
),
381 context_offset (FloatSave
.ErrorSelector
),
382 context_offset (FloatSave
.ErrorOffset
),
383 context_offset (FloatSave
.DataSelector
),
384 context_offset (FloatSave
.DataOffset
),
385 context_offset (FloatSave
.ErrorSelector
)
387 context_offset (Xmm0
),
388 context_offset (Xmm1
),
389 context_offset (Xmm2
),
390 context_offset (Xmm3
),
391 context_offset (Xmm4
),
392 context_offset (Xmm5
),
393 context_offset (Xmm6
),
394 context_offset (Xmm7
),
395 context_offset (Xmm8
),
396 context_offset (Xmm9
),
397 context_offset (Xmm10
),
398 context_offset (Xmm11
),
399 context_offset (Xmm12
),
400 context_offset (Xmm13
),
401 context_offset (Xmm14
),
402 context_offset (Xmm15
),
404 context_offset (FloatSave
.MxCsr
)
406 #undef context_offset
408 #endif /* __x86_64__ */
410 /* Fetch register from gdbserver regcache data. */
412 i386_fetch_inferior_register (struct regcache
*regcache
,
413 win32_thread_info
*th
, int r
)
415 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
420 l
= *((long *) context_offset
) & 0xffff;
421 supply_register (regcache
, r
, (char *) &l
);
423 else if (r
== FOP_REGNUM
)
425 l
= (*((long *) context_offset
) >> 16) & ((1 << 11) - 1);
426 supply_register (regcache
, r
, (char *) &l
);
429 supply_register (regcache
, r
, context_offset
);
432 /* Store a new register value into the thread context of TH. */
434 i386_store_inferior_register (struct regcache
*regcache
,
435 win32_thread_info
*th
, int r
)
437 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
438 collect_register (regcache
, r
, context_offset
);
441 static const unsigned char i386_win32_breakpoint
= 0xcc;
442 #define i386_win32_breakpoint_len 1
445 i386_arch_setup (void)
447 struct target_desc
*tdesc
;
450 tdesc
= amd64_create_target_description (X86_XSTATE_SSE_MASK
, false,
453 tdesc
= i386_create_target_description (X86_XSTATE_SSE_MASK
, false);
456 init_target_desc (tdesc
);
461 struct win32_target_ops the_low_target
= {
463 sizeof (mappings
) / sizeof (mappings
[0]),
465 i386_get_thread_context
,
466 i386_prepare_to_resume
,
468 i386_fetch_inferior_register
,
469 i386_store_inferior_register
,
471 &i386_win32_breakpoint
,
472 i386_win32_breakpoint_len
,
473 i386_supports_z_point_type
,
476 x86_stopped_by_watchpoint
,
477 x86_stopped_data_address