1 /* Copyright (C) 2007-2018 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 (thread_info
*thread
)
42 win32_thread_info
*th
= (win32_thread_info
*) thread_target_data (thread
);
44 /* The actual update is done later just before resuming the lwp,
45 we just mark that the registers need updating. */
46 th
->debug_registers_changed
= 1;
49 /* Update the inferior's debug register REGNUM from STATE. */
52 x86_dr_low_set_addr (int regnum
, CORE_ADDR addr
)
54 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
56 /* Only update the threads of this process. */
57 for_each_thread (current_thread
->id
.pid (), update_debug_registers
);
60 /* Update the inferior's DR7 debug control register from STATE. */
63 x86_dr_low_set_control (unsigned long control
)
65 /* Only update the threads of this process. */
66 for_each_thread (current_thread
->id
.pid (), update_debug_registers
);
69 /* Return the current value of a DR register of the current thread's
73 win32_get_current_dr (int dr
)
76 = (win32_thread_info
*) thread_target_data (current_thread
);
78 win32_require_context (th
);
82 return th->context.Dr ## DR
96 gdb_assert_not_reached ("unhandled dr");
100 x86_dr_low_get_addr (int regnum
)
102 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
104 return win32_get_current_dr (regnum
- DR_FIRSTADDR
);
108 x86_dr_low_get_control (void)
110 return win32_get_current_dr (7);
113 /* Get the value of the DR6 debug status register from the inferior
114 and record it in STATE. */
117 x86_dr_low_get_status (void)
119 return win32_get_current_dr (6);
122 /* Low-level function vector. */
123 struct x86_dr_low_type x86_dr_low
=
125 x86_dr_low_set_control
,
128 x86_dr_low_get_status
,
129 x86_dr_low_get_control
,
133 /* Breakpoint/watchpoint support. */
136 i386_supports_z_point_type (char z_type
)
140 case Z_PACKET_WRITE_WP
:
141 case Z_PACKET_ACCESS_WP
:
149 i386_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
150 int size
, struct raw_breakpoint
*bp
)
154 case raw_bkpt_type_write_wp
:
155 case raw_bkpt_type_access_wp
:
157 enum target_hw_bp_type hw_type
158 = raw_bkpt_type_to_target_hw_bp_type (type
);
160 return x86_dr_insert_watchpoint (&debug_reg_state
,
161 hw_type
, addr
, size
);
170 i386_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
171 int size
, struct raw_breakpoint
*bp
)
175 case raw_bkpt_type_write_wp
:
176 case raw_bkpt_type_access_wp
:
178 enum target_hw_bp_type hw_type
179 = raw_bkpt_type_to_target_hw_bp_type (type
);
181 return x86_dr_remove_watchpoint (&debug_reg_state
,
182 hw_type
, addr
, size
);
191 x86_stopped_by_watchpoint (void)
193 return x86_dr_stopped_by_watchpoint (&debug_reg_state
);
197 x86_stopped_data_address (void)
200 if (x86_dr_stopped_data_address (&debug_reg_state
, &addr
))
206 i386_initial_stuff (void)
208 x86_low_init_dregs (&debug_reg_state
);
212 i386_get_thread_context (win32_thread_info
*th
)
214 /* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
215 the system doesn't support extended registers. */
216 static DWORD extended_registers
= CONTEXT_EXTENDED_REGISTERS
;
219 th
->context
.ContextFlags
= (CONTEXT_FULL
220 | CONTEXT_FLOATING_POINT
221 | CONTEXT_DEBUG_REGISTERS
222 | extended_registers
);
224 if (!GetThreadContext (th
->h
, &th
->context
))
226 DWORD e
= GetLastError ();
228 if (extended_registers
&& e
== ERROR_INVALID_PARAMETER
)
230 extended_registers
= 0;
234 error ("GetThreadContext failure %ld\n", (long) e
);
239 i386_prepare_to_resume (win32_thread_info
*th
)
241 if (th
->debug_registers_changed
)
243 struct x86_debug_reg_state
*dr
= &debug_reg_state
;
245 win32_require_context (th
);
247 th
->context
.Dr0
= dr
->dr_mirror
[0];
248 th
->context
.Dr1
= dr
->dr_mirror
[1];
249 th
->context
.Dr2
= dr
->dr_mirror
[2];
250 th
->context
.Dr3
= dr
->dr_mirror
[3];
251 /* th->context.Dr6 = dr->dr_status_mirror;
252 FIXME: should we set dr6 also ?? */
253 th
->context
.Dr7
= dr
->dr_control_mirror
;
255 th
->debug_registers_changed
= 0;
260 i386_thread_added (win32_thread_info
*th
)
262 th
->debug_registers_changed
= 1;
266 i386_single_step (win32_thread_info
*th
)
268 th
->context
.EFlags
|= FLAG_TRACE_BIT
;
273 /* An array of offset mappings into a Win32 Context structure.
274 This is a one-to-one mapping which is indexed by gdb's register
275 numbers. It retrieves an offset into the context structure where
276 the 4 byte register is located.
277 An offset value of -1 indicates that Win32 does not provide this
278 register in it's CONTEXT structure. In this case regptr will return
279 a pointer into a dummy register. */
280 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
281 static const int mappings
[] = {
282 context_offset (Eax
),
283 context_offset (Ecx
),
284 context_offset (Edx
),
285 context_offset (Ebx
),
286 context_offset (Esp
),
287 context_offset (Ebp
),
288 context_offset (Esi
),
289 context_offset (Edi
),
290 context_offset (Eip
),
291 context_offset (EFlags
),
292 context_offset (SegCs
),
293 context_offset (SegSs
),
294 context_offset (SegDs
),
295 context_offset (SegEs
),
296 context_offset (SegFs
),
297 context_offset (SegGs
),
298 context_offset (FloatSave
.RegisterArea
[0 * 10]),
299 context_offset (FloatSave
.RegisterArea
[1 * 10]),
300 context_offset (FloatSave
.RegisterArea
[2 * 10]),
301 context_offset (FloatSave
.RegisterArea
[3 * 10]),
302 context_offset (FloatSave
.RegisterArea
[4 * 10]),
303 context_offset (FloatSave
.RegisterArea
[5 * 10]),
304 context_offset (FloatSave
.RegisterArea
[6 * 10]),
305 context_offset (FloatSave
.RegisterArea
[7 * 10]),
306 context_offset (FloatSave
.ControlWord
),
307 context_offset (FloatSave
.StatusWord
),
308 context_offset (FloatSave
.TagWord
),
309 context_offset (FloatSave
.ErrorSelector
),
310 context_offset (FloatSave
.ErrorOffset
),
311 context_offset (FloatSave
.DataSelector
),
312 context_offset (FloatSave
.DataOffset
),
313 context_offset (FloatSave
.ErrorSelector
),
315 context_offset (ExtendedRegisters
[10 * 16]),
316 context_offset (ExtendedRegisters
[11 * 16]),
317 context_offset (ExtendedRegisters
[12 * 16]),
318 context_offset (ExtendedRegisters
[13 * 16]),
319 context_offset (ExtendedRegisters
[14 * 16]),
320 context_offset (ExtendedRegisters
[15 * 16]),
321 context_offset (ExtendedRegisters
[16 * 16]),
322 context_offset (ExtendedRegisters
[17 * 16]),
324 context_offset (ExtendedRegisters
[24])
326 #undef context_offset
328 #else /* __x86_64__ */
330 #define context_offset(x) (offsetof (CONTEXT, x))
331 static const int mappings
[] =
333 context_offset (Rax
),
334 context_offset (Rbx
),
335 context_offset (Rcx
),
336 context_offset (Rdx
),
337 context_offset (Rsi
),
338 context_offset (Rdi
),
339 context_offset (Rbp
),
340 context_offset (Rsp
),
343 context_offset (R10
),
344 context_offset (R11
),
345 context_offset (R12
),
346 context_offset (R13
),
347 context_offset (R14
),
348 context_offset (R15
),
349 context_offset (Rip
),
350 context_offset (EFlags
),
351 context_offset (SegCs
),
352 context_offset (SegSs
),
353 context_offset (SegDs
),
354 context_offset (SegEs
),
355 context_offset (SegFs
),
356 context_offset (SegGs
),
357 context_offset (FloatSave
.FloatRegisters
[0]),
358 context_offset (FloatSave
.FloatRegisters
[1]),
359 context_offset (FloatSave
.FloatRegisters
[2]),
360 context_offset (FloatSave
.FloatRegisters
[3]),
361 context_offset (FloatSave
.FloatRegisters
[4]),
362 context_offset (FloatSave
.FloatRegisters
[5]),
363 context_offset (FloatSave
.FloatRegisters
[6]),
364 context_offset (FloatSave
.FloatRegisters
[7]),
365 context_offset (FloatSave
.ControlWord
),
366 context_offset (FloatSave
.StatusWord
),
367 context_offset (FloatSave
.TagWord
),
368 context_offset (FloatSave
.ErrorSelector
),
369 context_offset (FloatSave
.ErrorOffset
),
370 context_offset (FloatSave
.DataSelector
),
371 context_offset (FloatSave
.DataOffset
),
372 context_offset (FloatSave
.ErrorSelector
)
374 context_offset (Xmm0
),
375 context_offset (Xmm1
),
376 context_offset (Xmm2
),
377 context_offset (Xmm3
),
378 context_offset (Xmm4
),
379 context_offset (Xmm5
),
380 context_offset (Xmm6
),
381 context_offset (Xmm7
),
382 context_offset (Xmm8
),
383 context_offset (Xmm9
),
384 context_offset (Xmm10
),
385 context_offset (Xmm11
),
386 context_offset (Xmm12
),
387 context_offset (Xmm13
),
388 context_offset (Xmm14
),
389 context_offset (Xmm15
),
391 context_offset (FloatSave
.MxCsr
)
393 #undef context_offset
395 #endif /* __x86_64__ */
397 /* Fetch register from gdbserver regcache data. */
399 i386_fetch_inferior_register (struct regcache
*regcache
,
400 win32_thread_info
*th
, int r
)
402 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
407 l
= *((long *) context_offset
) & 0xffff;
408 supply_register (regcache
, r
, (char *) &l
);
410 else if (r
== FOP_REGNUM
)
412 l
= (*((long *) context_offset
) >> 16) & ((1 << 11) - 1);
413 supply_register (regcache
, r
, (char *) &l
);
416 supply_register (regcache
, r
, context_offset
);
419 /* Store a new register value into the thread context of TH. */
421 i386_store_inferior_register (struct regcache
*regcache
,
422 win32_thread_info
*th
, int r
)
424 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
425 collect_register (regcache
, r
, context_offset
);
428 static const unsigned char i386_win32_breakpoint
= 0xcc;
429 #define i386_win32_breakpoint_len 1
432 i386_arch_setup (void)
434 struct target_desc
*tdesc
;
437 tdesc
= amd64_create_target_description (X86_XSTATE_SSE_MASK
, false,
440 tdesc
= i386_create_target_description (X86_XSTATE_SSE_MASK
, false);
443 init_target_desc (tdesc
);
448 struct win32_target_ops the_low_target
= {
450 sizeof (mappings
) / sizeof (mappings
[0]),
452 i386_get_thread_context
,
453 i386_prepare_to_resume
,
455 i386_fetch_inferior_register
,
456 i386_store_inferior_register
,
458 &i386_win32_breakpoint
,
459 i386_win32_breakpoint_len
,
460 i386_supports_z_point_type
,
463 x86_stopped_by_watchpoint
,
464 x86_stopped_data_address