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