1 /* Copyright (C) 2007, 2008 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"
24 #define FLAG_TRACE_BIT 0x100
26 /* Defined in auto-generated file reg-i386.c. */
27 void init_registers_i386 (void);
29 static unsigned dr[8];
31 static int debug_registers_changed = 0;
32 static int debug_registers_used = 0;
35 i386_initial_stuff (void)
37 memset (&dr, 0, sizeof (dr));
38 debug_registers_changed = 0;
39 debug_registers_used = 0;
43 i386_get_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
45 th->context.ContextFlags = \
47 CONTEXT_FLOATING_POINT | \
48 CONTEXT_EXTENDED_REGISTERS | \
49 CONTEXT_DEBUG_REGISTERS;
51 GetThreadContext (th->h, &th->context);
53 debug_registers_changed = 0;
55 if (th->tid == current_event->dwThreadId)
57 /* Copy dr values from the current thread. */
58 dr[0] = th->context.Dr0;
59 dr[1] = th->context.Dr1;
60 dr[2] = th->context.Dr2;
61 dr[3] = th->context.Dr3;
62 dr[6] = th->context.Dr6;
63 dr[7] = th->context.Dr7;
68 i386_set_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
70 if (debug_registers_changed)
72 th->context.Dr0 = dr[0];
73 th->context.Dr1 = dr[1];
74 th->context.Dr2 = dr[2];
75 th->context.Dr3 = dr[3];
76 /* th->context.Dr6 = dr[6];
77 FIXME: should we set dr6 also ?? */
78 th->context.Dr7 = dr[7];
81 SetThreadContext (th->h, &th->context);
85 i386_thread_added (win32_thread_info *th)
87 /* Set the debug registers for the new thread if they are used. */
88 if (debug_registers_used)
90 th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
91 GetThreadContext (th->h, &th->context);
93 th->context.Dr0 = dr[0];
94 th->context.Dr1 = dr[1];
95 th->context.Dr2 = dr[2];
96 th->context.Dr3 = dr[3];
97 /* th->context.Dr6 = dr[6];
98 FIXME: should we set dr6 also ?? */
99 th->context.Dr7 = dr[7];
101 SetThreadContext (th->h, &th->context);
102 th->context.ContextFlags = 0;
107 i386_single_step (win32_thread_info *th)
109 th->context.EFlags |= FLAG_TRACE_BIT;
112 /* An array of offset mappings into a Win32 Context structure.
113 This is a one-to-one mapping which is indexed by gdb's register
114 numbers. It retrieves an offset into the context structure where
115 the 4 byte register is located.
116 An offset value of -1 indicates that Win32 does not provide this
117 register in it's CONTEXT structure. In this case regptr will return
118 a pointer into a dummy register. */
119 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
120 static const int mappings[] = {
121 context_offset (Eax),
122 context_offset (Ecx),
123 context_offset (Edx),
124 context_offset (Ebx),
125 context_offset (Esp),
126 context_offset (Ebp),
127 context_offset (Esi),
128 context_offset (Edi),
129 context_offset (Eip),
130 context_offset (EFlags),
131 context_offset (SegCs),
132 context_offset (SegSs),
133 context_offset (SegDs),
134 context_offset (SegEs),
135 context_offset (SegFs),
136 context_offset (SegGs),
137 context_offset (FloatSave.RegisterArea[0 * 10]),
138 context_offset (FloatSave.RegisterArea[1 * 10]),
139 context_offset (FloatSave.RegisterArea[2 * 10]),
140 context_offset (FloatSave.RegisterArea[3 * 10]),
141 context_offset (FloatSave.RegisterArea[4 * 10]),
142 context_offset (FloatSave.RegisterArea[5 * 10]),
143 context_offset (FloatSave.RegisterArea[6 * 10]),
144 context_offset (FloatSave.RegisterArea[7 * 10]),
145 context_offset (FloatSave.ControlWord),
146 context_offset (FloatSave.StatusWord),
147 context_offset (FloatSave.TagWord),
148 context_offset (FloatSave.ErrorSelector),
149 context_offset (FloatSave.ErrorOffset),
150 context_offset (FloatSave.DataSelector),
151 context_offset (FloatSave.DataOffset),
152 context_offset (FloatSave.ErrorSelector),
154 context_offset (ExtendedRegisters[10 * 16]),
155 context_offset (ExtendedRegisters[11 * 16]),
156 context_offset (ExtendedRegisters[12 * 16]),
157 context_offset (ExtendedRegisters[13 * 16]),
158 context_offset (ExtendedRegisters[14 * 16]),
159 context_offset (ExtendedRegisters[15 * 16]),
160 context_offset (ExtendedRegisters[16 * 16]),
161 context_offset (ExtendedRegisters[17 * 16]),
163 context_offset (ExtendedRegisters[24])
165 #undef context_offset
167 /* Fetch register from gdbserver regcache data. */
169 i386_fetch_inferior_register (win32_thread_info *th, int r)
171 char *context_offset = (char *) &th->context + mappings[r];
176 l = *((long *) context_offset) & 0xffff;
177 supply_register (r, (char *) &l);
179 else if (r == FOP_REGNUM)
181 l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
182 supply_register (r, (char *) &l);
185 supply_register (r, context_offset);
188 /* Store a new register value into the thread context of TH. */
190 i386_store_inferior_register (win32_thread_info *th, int r)
192 char *context_offset = (char *) &th->context + mappings[r];
193 collect_register (r, context_offset);
196 struct win32_target_ops the_low_target = {
198 sizeof (mappings) / sizeof (mappings[0]),
200 i386_get_thread_context,
201 i386_set_thread_context,
203 i386_fetch_inferior_register,
204 i386_store_inferior_register,
206 NULL, /* breakpoint */
207 0, /* breakpoint_len */
208 "i386" /* arch_string */