1 /* Copyright (C) 2007, 2008, 2009 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"
25 #define FLAG_TRACE_BIT 0x100
27 /* Defined in auto-generated file reg-i386.c. */
28 void init_registers_i386 (void);
30 static struct i386_debug_reg_state debug_reg_state
;
32 static int debug_registers_changed
= 0;
33 static int debug_registers_used
= 0;
35 /* Update the inferior's debug register REGNUM from STATE. */
38 i386_dr_low_set_addr (const struct i386_debug_reg_state
*state
, int regnum
)
40 if (! (regnum
>= 0 && regnum
<= DR_LASTADDR
- DR_FIRSTADDR
))
41 fatal ("Invalid debug register %d", regnum
);
43 /* debug_reg_state.dr_mirror is already set.
44 Just notify i386_set_thread_context, i386_thread_added
45 that the registers need to be updated. */
46 debug_registers_changed
= 1;
47 debug_registers_used
= 1;
50 /* Update the inferior's DR7 debug control register from STATE. */
53 i386_dr_low_set_control (const struct i386_debug_reg_state
*state
)
55 /* debug_reg_state.dr_control_mirror is already set.
56 Just notify i386_set_thread_context, i386_thread_added
57 that the registers need to be updated. */
58 debug_registers_changed
= 1;
59 debug_registers_used
= 1;
62 /* Get the value of the DR6 debug status register from the inferior
63 and record it in STATE. */
66 i386_dr_low_get_status (struct i386_debug_reg_state
*state
)
68 /* We don't need to do anything here, the last call to thread_rec for
69 current_event.dwThreadId id has already set it. */
72 /* Watchpoint support. */
75 i386_insert_point (char type
, CORE_ADDR addr
, int len
)
82 return i386_low_insert_watchpoint (&debug_reg_state
,
91 i386_remove_point (char type
, CORE_ADDR addr
, int len
)
98 return i386_low_remove_watchpoint (&debug_reg_state
,
107 i386_stopped_by_watchpoint (void)
109 return i386_low_stopped_by_watchpoint (&debug_reg_state
);
113 i386_stopped_data_address (void)
116 if (i386_low_stopped_data_address (&debug_reg_state
, &addr
))
122 i386_initial_stuff (void)
124 i386_low_init_dregs (&debug_reg_state
);
125 debug_registers_changed
= 0;
126 debug_registers_used
= 0;
130 i386_get_thread_context (win32_thread_info
*th
, DEBUG_EVENT
* current_event
)
132 th
->context
.ContextFlags
= \
134 CONTEXT_FLOATING_POINT
| \
135 CONTEXT_EXTENDED_REGISTERS
| \
136 CONTEXT_DEBUG_REGISTERS
;
138 GetThreadContext (th
->h
, &th
->context
);
140 debug_registers_changed
= 0;
142 if (th
->tid
== current_event
->dwThreadId
)
144 /* Copy dr values from the current thread. */
145 struct i386_debug_reg_state
*dr
= &debug_reg_state
;
146 dr
->dr_mirror
[0] = th
->context
.Dr0
;
147 dr
->dr_mirror
[1] = th
->context
.Dr1
;
148 dr
->dr_mirror
[2] = th
->context
.Dr2
;
149 dr
->dr_mirror
[3] = th
->context
.Dr3
;
150 dr
->dr_status_mirror
= th
->context
.Dr6
;
151 dr
->dr_control_mirror
= th
->context
.Dr7
;
156 i386_set_thread_context (win32_thread_info
*th
, DEBUG_EVENT
* current_event
)
158 if (debug_registers_changed
)
160 struct i386_debug_reg_state
*dr
= &debug_reg_state
;
161 th
->context
.Dr0
= dr
->dr_mirror
[0];
162 th
->context
.Dr1
= dr
->dr_mirror
[1];
163 th
->context
.Dr2
= dr
->dr_mirror
[2];
164 th
->context
.Dr3
= dr
->dr_mirror
[3];
165 /* th->context.Dr6 = dr->dr_status_mirror;
166 FIXME: should we set dr6 also ?? */
167 th
->context
.Dr7
= dr
->dr_control_mirror
;
170 SetThreadContext (th
->h
, &th
->context
);
174 i386_thread_added (win32_thread_info
*th
)
176 /* Set the debug registers for the new thread if they are used. */
177 if (debug_registers_used
)
179 struct i386_debug_reg_state
*dr
= &debug_reg_state
;
180 th
->context
.ContextFlags
= CONTEXT_DEBUG_REGISTERS
;
181 GetThreadContext (th
->h
, &th
->context
);
183 th
->context
.Dr0
= dr
->dr_mirror
[0];
184 th
->context
.Dr1
= dr
->dr_mirror
[1];
185 th
->context
.Dr2
= dr
->dr_mirror
[2];
186 th
->context
.Dr3
= dr
->dr_mirror
[3];
187 /* th->context.Dr6 = dr->dr_status_mirror;
188 FIXME: should we set dr6 also ?? */
189 th
->context
.Dr7
= dr
->dr_control_mirror
;
191 SetThreadContext (th
->h
, &th
->context
);
192 th
->context
.ContextFlags
= 0;
197 i386_single_step (win32_thread_info
*th
)
199 th
->context
.EFlags
|= FLAG_TRACE_BIT
;
202 /* An array of offset mappings into a Win32 Context structure.
203 This is a one-to-one mapping which is indexed by gdb's register
204 numbers. It retrieves an offset into the context structure where
205 the 4 byte register is located.
206 An offset value of -1 indicates that Win32 does not provide this
207 register in it's CONTEXT structure. In this case regptr will return
208 a pointer into a dummy register. */
209 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
210 static const int mappings
[] = {
211 context_offset (Eax
),
212 context_offset (Ecx
),
213 context_offset (Edx
),
214 context_offset (Ebx
),
215 context_offset (Esp
),
216 context_offset (Ebp
),
217 context_offset (Esi
),
218 context_offset (Edi
),
219 context_offset (Eip
),
220 context_offset (EFlags
),
221 context_offset (SegCs
),
222 context_offset (SegSs
),
223 context_offset (SegDs
),
224 context_offset (SegEs
),
225 context_offset (SegFs
),
226 context_offset (SegGs
),
227 context_offset (FloatSave
.RegisterArea
[0 * 10]),
228 context_offset (FloatSave
.RegisterArea
[1 * 10]),
229 context_offset (FloatSave
.RegisterArea
[2 * 10]),
230 context_offset (FloatSave
.RegisterArea
[3 * 10]),
231 context_offset (FloatSave
.RegisterArea
[4 * 10]),
232 context_offset (FloatSave
.RegisterArea
[5 * 10]),
233 context_offset (FloatSave
.RegisterArea
[6 * 10]),
234 context_offset (FloatSave
.RegisterArea
[7 * 10]),
235 context_offset (FloatSave
.ControlWord
),
236 context_offset (FloatSave
.StatusWord
),
237 context_offset (FloatSave
.TagWord
),
238 context_offset (FloatSave
.ErrorSelector
),
239 context_offset (FloatSave
.ErrorOffset
),
240 context_offset (FloatSave
.DataSelector
),
241 context_offset (FloatSave
.DataOffset
),
242 context_offset (FloatSave
.ErrorSelector
),
244 context_offset (ExtendedRegisters
[10 * 16]),
245 context_offset (ExtendedRegisters
[11 * 16]),
246 context_offset (ExtendedRegisters
[12 * 16]),
247 context_offset (ExtendedRegisters
[13 * 16]),
248 context_offset (ExtendedRegisters
[14 * 16]),
249 context_offset (ExtendedRegisters
[15 * 16]),
250 context_offset (ExtendedRegisters
[16 * 16]),
251 context_offset (ExtendedRegisters
[17 * 16]),
253 context_offset (ExtendedRegisters
[24])
255 #undef context_offset
257 /* Fetch register from gdbserver regcache data. */
259 i386_fetch_inferior_register (win32_thread_info
*th
, int r
)
261 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
266 l
= *((long *) context_offset
) & 0xffff;
267 supply_register (r
, (char *) &l
);
269 else if (r
== FOP_REGNUM
)
271 l
= (*((long *) context_offset
) >> 16) & ((1 << 11) - 1);
272 supply_register (r
, (char *) &l
);
275 supply_register (r
, context_offset
);
278 /* Store a new register value into the thread context of TH. */
280 i386_store_inferior_register (win32_thread_info
*th
, int r
)
282 char *context_offset
= (char *) &th
->context
+ mappings
[r
];
283 collect_register (r
, context_offset
);
286 struct win32_target_ops the_low_target
= {
288 sizeof (mappings
) / sizeof (mappings
[0]),
290 i386_get_thread_context
,
291 i386_set_thread_context
,
293 i386_fetch_inferior_register
,
294 i386_store_inferior_register
,
296 NULL
, /* breakpoint */
297 0, /* breakpoint_len */
300 i386_stopped_by_watchpoint
,
301 i386_stopped_data_address