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"
27 #ifndef CONTEXT_EXTENDED_REGISTERS
28 #define CONTEXT_EXTENDED_REGISTERS 0
34 #define FLAG_TRACE_BIT 0x100
36 static struct x86_debug_reg_state debug_reg_state
;
39 update_debug_registers_callback (struct inferior_list_entry
*entry
,
42 struct thread_info
*thr
= (struct thread_info
*) entry
;
43 win32_thread_info
*th
= (win32_thread_info
*) thread_target_data (thr
);
44 int pid
= *(int *) pid_p
;
46 /* Only update the threads of this process. */
47 if (pid_of (thr
) == pid
)
49 /* The actual update is done later just before resuming the lwp,
50 we just mark that the registers need updating. */
51 th
->debug_registers_changed
= 1;
57 /* Update the inferior's debug register REGNUM from STATE. */
60 x86_dr_low_set_addr (int regnum
, CORE_ADDR addr
)
62 /* Only update the threads of this process. */
63 int pid
= pid_of (current_thread
);
65 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
67 find_inferior (&all_threads
, update_debug_registers_callback
, &pid
);
70 /* Update the inferior's DR7 debug control register from STATE. */
73 x86_dr_low_set_control (unsigned long control
)
75 /* Only update the threads of this process. */
76 int pid
= pid_of (current_thread
);
78 find_inferior (&all_threads
, update_debug_registers_callback
, &pid
);
81 /* Return the current value of a DR register of the current thread's
85 win32_get_current_dr (int dr
)
88 = (win32_thread_info
*) thread_target_data (current_thread
);
90 win32_require_context (th
);
94 return th->context.Dr ## DR
108 gdb_assert_not_reached ("unhandled dr");
112 x86_dr_low_get_addr (int regnum
)
114 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
116 return win32_get_current_dr (regnum
- DR_FIRSTADDR
);
120 x86_dr_low_get_control (void)
122 return win32_get_current_dr (7);
125 /* Get the value of the DR6 debug status register from the inferior
126 and record it in STATE. */
129 x86_dr_low_get_status (void)
131 return win32_get_current_dr (6);
134 /* Low-level function vector. */
135 struct x86_dr_low_type x86_dr_low
=
137 x86_dr_low_set_control
,
140 x86_dr_low_get_status
,
141 x86_dr_low_get_control
,
145 /* Breakpoint/watchpoint support. */
148 i386_supports_z_point_type (char z_type
)
152 case Z_PACKET_WRITE_WP
:
153 case Z_PACKET_ACCESS_WP
:
161 i386_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
162 int size
, struct raw_breakpoint
*bp
)
166 case raw_bkpt_type_write_wp
:
167 case raw_bkpt_type_access_wp
:
169 enum target_hw_bp_type hw_type
170 = raw_bkpt_type_to_target_hw_bp_type (type
);
172 return x86_dr_insert_watchpoint (&debug_reg_state
,
173 hw_type
, addr
, size
);
182 i386_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
183 int size
, struct raw_breakpoint
*bp
)
187 case raw_bkpt_type_write_wp
:
188 case raw_bkpt_type_access_wp
:
190 enum target_hw_bp_type hw_type
191 = raw_bkpt_type_to_target_hw_bp_type (type
);
193 return x86_dr_remove_watchpoint (&debug_reg_state
,
194 hw_type
, addr
, size
);
203 x86_stopped_by_watchpoint (void)
205 return x86_dr_stopped_by_watchpoint (&debug_reg_state
);
209 x86_stopped_data_address (void)
212 if (x86_dr_stopped_data_address (&debug_reg_state
, &addr
))
218 i386_initial_stuff (void)
220 x86_low_init_dregs (&debug_reg_state
);
224 i386_get_thread_context (win32_thread_info
*th
)
226 /* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
227 the system doesn't support extended registers. */
228 static DWORD extended_registers
= CONTEXT_EXTENDED_REGISTERS
;
231 th
->context
.ContextFlags
= (CONTEXT_FULL
232 | CONTEXT_FLOATING_POINT
233 | CONTEXT_DEBUG_REGISTERS
234 | extended_registers
);
236 if (!GetThreadContext (th
->h
, &th
->context
))
238 DWORD e
= GetLastError ();
240 if (extended_registers
&& e
== ERROR_INVALID_PARAMETER
)
242 extended_registers
= 0;
246 error ("GetThreadContext failure %ld\n", (long) e
);
251 i386_prepare_to_resume (win32_thread_info
*th
)
253 if (th
->debug_registers_changed
)
255 struct x86_debug_reg_state
*dr
= &debug_reg_state
;
257 win32_require_context (th
);
259 th
->context
.Dr0
= dr
->dr_mirror
[0];
260 th
->context
.Dr1
= dr
->dr_mirror
[1];
261 th
->context
.Dr2
= dr
->dr_mirror
[2];
262 th
->context
.Dr3
= dr
->dr_mirror
[3];
263 /* th->context.Dr6 = dr->dr_status_mirror;
264 FIXME: should we set dr6 also ?? */
265 th
->context
.Dr7
= dr
->dr_control_mirror
;
267 th
->debug_registers_changed
= 0;
272 i386_thread_added (win32_thread_info
*th
)
274 th
->debug_registers_changed
= 1;
278 i386_single_step (win32_thread_info
*th
)
280 th
->context
.EFlags
|= FLAG_TRACE_BIT
;
285 /* An array of offset mappings into a Win32 Context structure.
286 This is a one-to-one mapping which is indexed by gdb's register
287 numbers. It retrieves an offset into the context structure where
288 the 4 byte register is located.
289 An offset value of -1 indicates that Win32 does not provide this
290 register in it's CONTEXT structure. In this case regptr will return
291 a pointer into a dummy register. */
292 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
293 static const int mappings
[] = {
294 context_offset (Eax
),
295 context_offset (Ecx
),
296 context_offset (Edx
),
297 context_offset (Ebx
),
298 context_offset (Esp
),
299 context_offset (Ebp
),
300 context_offset (Esi
),
301 context_offset (Edi
),
302 context_offset (Eip
),
303 context_offset (EFlags
),
304 context_offset (SegCs
),
305 context_offset (SegSs
),
306 context_offset (SegDs
),
307 context_offset (SegEs
),
308 context_offset (SegFs
),
309 context_offset (SegGs
),
310 context_offset (FloatSave
.RegisterArea
[0 * 10]),
311 context_offset (FloatSave
.RegisterArea
[1 * 10]),
312 context_offset (FloatSave
.RegisterArea
[2 * 10]),
313 context_offset (FloatSave
.RegisterArea
[3 * 10]),
314 context_offset (FloatSave
.RegisterArea
[4 * 10]),
315 context_offset (FloatSave
.RegisterArea
[5 * 10]),
316 context_offset (FloatSave
.RegisterArea
[6 * 10]),
317 context_offset (FloatSave
.RegisterArea
[7 * 10]),
318 context_offset (FloatSave
.ControlWord
),
319 context_offset (FloatSave
.StatusWord
),
320 context_offset (FloatSave
.TagWord
),
321 context_offset (FloatSave
.ErrorSelector
),
322 context_offset (FloatSave
.ErrorOffset
),
323 context_offset (FloatSave
.DataSelector
),
324 context_offset (FloatSave
.DataOffset
),
325 context_offset (FloatSave
.ErrorSelector
),
327 context_offset (ExtendedRegisters
[10 * 16]),
328 context_offset (ExtendedRegisters
[11 * 16]),
329 context_offset (ExtendedRegisters
[12 * 16]),
330 context_offset (ExtendedRegisters
[13 * 16]),
331 context_offset (ExtendedRegisters
[14 * 16]),
332 context_offset (ExtendedRegisters
[15 * 16]),
333 context_offset (ExtendedRegisters
[16 * 16]),
334 context_offset (ExtendedRegisters
[17 * 16]),
336 context_offset (ExtendedRegisters
[24])
338 #undef context_offset
340 #else /* __x86_64__ */
342 #define context_offset(x) (offsetof (CONTEXT, x))
343 static const int mappings
[] =
345 context_offset (Rax
),
346 context_offset (Rbx
),
347 context_offset (Rcx
),
348 context_offset (Rdx
),
349 context_offset (Rsi
),
350 context_offset (Rdi
),
351 context_offset (Rbp
),
352 context_offset (Rsp
),
355 context_offset (R10
),
356 context_offset (R11
),
357 context_offset (R12
),
358 context_offset (R13
),
359 context_offset (R14
),
360 context_offset (R15
),
361 context_offset (Rip
),
362 context_offset (EFlags
),
363 context_offset (SegCs
),
364 context_offset (SegSs
),
365 context_offset (SegDs
),
366 context_offset (SegEs
),
367 context_offset (SegFs
),
368 context_offset (SegGs
),
369 context_offset (FloatSave
.FloatRegisters
[0]),
370 context_offset (FloatSave
.FloatRegisters
[1]),
371 context_offset (FloatSave
.FloatRegisters
[2]),
372 context_offset (FloatSave
.FloatRegisters
[3]),
373 context_offset (FloatSave
.FloatRegisters
[4]),
374 context_offset (FloatSave
.FloatRegisters
[5]),
375 context_offset (FloatSave
.FloatRegisters
[6]),
376 context_offset (FloatSave
.FloatRegisters
[7]),
377 context_offset (FloatSave
.ControlWord
),
378 context_offset (FloatSave
.StatusWord
),
379 context_offset (FloatSave
.TagWord
),
380 context_offset (FloatSave
.ErrorSelector
),
381 context_offset (FloatSave
.ErrorOffset
),
382 context_offset (FloatSave
.DataSelector
),
383 context_offset (FloatSave
.DataOffset
),
384 context_offset (FloatSave
.ErrorSelector
)
386 context_offset (Xmm0
),
387 context_offset (Xmm1
),
388 context_offset (Xmm2
),
389 context_offset (Xmm3
),
390 context_offset (Xmm4
),
391 context_offset (Xmm5
),
392 context_offset (Xmm6
),
393 context_offset (Xmm7
),
394 context_offset (Xmm8
),
395 context_offset (Xmm9
),
396 context_offset (Xmm10
),
397 context_offset (Xmm11
),
398 context_offset (Xmm12
),
399 context_offset (Xmm13
),
400 context_offset (Xmm14
),
401 context_offset (Xmm15
),
403 context_offset (FloatSave
.MxCsr
)
405 #undef context_offset
407 #endif /* __x86_64__ */
409 /* Fetch register from gdbserver regcache data. */
411 i386_fetch_inferior_register (struct regcache
*regcache
,
412 win32_thread_info
*th
, int r
)
414 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
419 l
= *((long *) context_offset
) & 0xffff;
420 supply_register (regcache
, r
, (char *) &l
);
422 else if (r
== FOP_REGNUM
)
424 l
= (*((long *) context_offset
) >> 16) & ((1 << 11) - 1);
425 supply_register (regcache
, r
, (char *) &l
);
428 supply_register (regcache
, r
, context_offset
);
431 /* Store a new register value into the thread context of TH. */
433 i386_store_inferior_register (struct regcache
*regcache
,
434 win32_thread_info
*th
, int r
)
436 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
437 collect_register (regcache
, r
, context_offset
);
440 static const unsigned char i386_win32_breakpoint
= 0xcc;
441 #define i386_win32_breakpoint_len 1
444 i386_arch_setup (void)
447 win32_tdesc
= amd64_create_target_description (X86_XSTATE_SSE_MASK
, false,
450 win32_tdesc
= i386_create_target_description (X86_XSTATE_SSE_MASK
, false);
454 struct win32_target_ops the_low_target
= {
456 sizeof (mappings
) / sizeof (mappings
[0]),
458 i386_get_thread_context
,
459 i386_prepare_to_resume
,
461 i386_fetch_inferior_register
,
462 i386_store_inferior_register
,
464 &i386_win32_breakpoint
,
465 i386_win32_breakpoint_len
,
466 i386_supports_z_point_type
,
469 x86_stopped_by_watchpoint
,
470 x86_stopped_data_address