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68070c10 PA |
1 | /* Copyright (C) 2007 Free Software Foundation, Inc. |
2 | ||
3 | This file is part of GDB. | |
4 | ||
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 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
18 | Boston, MA 02110-1301, USA. */ | |
19 | ||
20 | #include "server.h" | |
21 | #include "win32-low.h" | |
22 | ||
23 | #define FCS_REGNUM 27 | |
24 | #define FOP_REGNUM 31 | |
25 | ||
26 | #define FLAG_TRACE_BIT 0x100 | |
27 | ||
28 | static unsigned dr[8]; | |
29 | ||
34b34921 PA |
30 | static int debug_registers_changed = 0; |
31 | static int debug_registers_used = 0; | |
32 | ||
68070c10 | 33 | static void |
34b34921 | 34 | i386_initial_stuff (void) |
68070c10 PA |
35 | { |
36 | memset (&dr, 0, sizeof (dr)); | |
34b34921 PA |
37 | debug_registers_changed = 0; |
38 | debug_registers_used = 0; | |
68070c10 PA |
39 | } |
40 | ||
41 | static void | |
34b34921 | 42 | i386_get_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event) |
68070c10 | 43 | { |
34b34921 PA |
44 | th->context.ContextFlags = \ |
45 | CONTEXT_FULL | \ | |
46 | CONTEXT_FLOATING_POINT | \ | |
47 | CONTEXT_EXTENDED_REGISTERS | \ | |
48 | CONTEXT_DEBUG_REGISTERS; | |
49 | ||
50 | GetThreadContext (th->h, &th->context); | |
51 | ||
52 | debug_registers_changed = 0; | |
53 | ||
54 | if (th->tid == current_event->dwThreadId) | |
55 | { | |
56 | /* Copy dr values from the current thread. */ | |
57 | dr[0] = th->context.Dr0; | |
58 | dr[1] = th->context.Dr1; | |
59 | dr[2] = th->context.Dr2; | |
60 | dr[3] = th->context.Dr3; | |
61 | dr[6] = th->context.Dr6; | |
62 | dr[7] = th->context.Dr7; | |
63 | } | |
68070c10 PA |
64 | } |
65 | ||
66 | static void | |
34b34921 | 67 | i386_set_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event) |
68070c10 | 68 | { |
34b34921 PA |
69 | if (debug_registers_changed) |
70 | { | |
71 | th->context.Dr0 = dr[0]; | |
72 | th->context.Dr1 = dr[1]; | |
73 | th->context.Dr2 = dr[2]; | |
74 | th->context.Dr3 = dr[3]; | |
75 | /* th->context.Dr6 = dr[6]; | |
76 | FIXME: should we set dr6 also ?? */ | |
77 | th->context.Dr7 = dr[7]; | |
78 | } | |
79 | ||
80 | SetThreadContext (th->h, &th->context); | |
68070c10 PA |
81 | } |
82 | ||
68070c10 | 83 | static void |
34b34921 | 84 | i386_thread_added (win32_thread_info *th) |
68070c10 | 85 | { |
34b34921 PA |
86 | /* Set the debug registers for the new thread if they are used. */ |
87 | if (debug_registers_used) | |
68070c10 | 88 | { |
34b34921 PA |
89 | th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS; |
90 | GetThreadContext (th->h, &th->context); | |
91 | ||
92 | th->context.Dr0 = dr[0]; | |
93 | th->context.Dr1 = dr[1]; | |
94 | th->context.Dr2 = dr[2]; | |
95 | th->context.Dr3 = dr[3]; | |
96 | /* th->context.Dr6 = dr[6]; | |
97 | FIXME: should we set dr6 also ?? */ | |
98 | th->context.Dr7 = dr[7]; | |
99 | ||
100 | SetThreadContext (th->h, &th->context); | |
101 | th->context.ContextFlags = 0; | |
68070c10 | 102 | } |
68070c10 PA |
103 | } |
104 | ||
105 | static void | |
34b34921 | 106 | i386_single_step (win32_thread_info *th) |
68070c10 PA |
107 | { |
108 | th->context.EFlags |= FLAG_TRACE_BIT; | |
109 | } | |
110 | ||
111 | /* An array of offset mappings into a Win32 Context structure. | |
112 | This is a one-to-one mapping which is indexed by gdb's register | |
113 | numbers. It retrieves an offset into the context structure where | |
114 | the 4 byte register is located. | |
115 | An offset value of -1 indicates that Win32 does not provide this | |
116 | register in it's CONTEXT structure. In this case regptr will return | |
117 | a pointer into a dummy register. */ | |
118 | #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x)) | |
119 | static const int mappings[] = { | |
120 | context_offset (Eax), | |
121 | context_offset (Ecx), | |
122 | context_offset (Edx), | |
123 | context_offset (Ebx), | |
124 | context_offset (Esp), | |
125 | context_offset (Ebp), | |
126 | context_offset (Esi), | |
127 | context_offset (Edi), | |
128 | context_offset (Eip), | |
129 | context_offset (EFlags), | |
130 | context_offset (SegCs), | |
131 | context_offset (SegSs), | |
132 | context_offset (SegDs), | |
133 | context_offset (SegEs), | |
134 | context_offset (SegFs), | |
135 | context_offset (SegGs), | |
136 | context_offset (FloatSave.RegisterArea[0 * 10]), | |
137 | context_offset (FloatSave.RegisterArea[1 * 10]), | |
138 | context_offset (FloatSave.RegisterArea[2 * 10]), | |
139 | context_offset (FloatSave.RegisterArea[3 * 10]), | |
140 | context_offset (FloatSave.RegisterArea[4 * 10]), | |
141 | context_offset (FloatSave.RegisterArea[5 * 10]), | |
142 | context_offset (FloatSave.RegisterArea[6 * 10]), | |
143 | context_offset (FloatSave.RegisterArea[7 * 10]), | |
144 | context_offset (FloatSave.ControlWord), | |
145 | context_offset (FloatSave.StatusWord), | |
146 | context_offset (FloatSave.TagWord), | |
147 | context_offset (FloatSave.ErrorSelector), | |
148 | context_offset (FloatSave.ErrorOffset), | |
149 | context_offset (FloatSave.DataSelector), | |
150 | context_offset (FloatSave.DataOffset), | |
151 | context_offset (FloatSave.ErrorSelector), | |
152 | /* XMM0-7 */ | |
153 | context_offset (ExtendedRegisters[10 * 16]), | |
154 | context_offset (ExtendedRegisters[11 * 16]), | |
155 | context_offset (ExtendedRegisters[12 * 16]), | |
156 | context_offset (ExtendedRegisters[13 * 16]), | |
157 | context_offset (ExtendedRegisters[14 * 16]), | |
158 | context_offset (ExtendedRegisters[15 * 16]), | |
159 | context_offset (ExtendedRegisters[16 * 16]), | |
160 | context_offset (ExtendedRegisters[17 * 16]), | |
161 | /* MXCSR */ | |
162 | context_offset (ExtendedRegisters[24]) | |
163 | }; | |
164 | #undef context_offset | |
165 | ||
34b34921 PA |
166 | /* Fetch register from gdbserver regcache data. */ |
167 | static void | |
168 | i386_fetch_inferior_register (win32_thread_info *th, int r) | |
169 | { | |
170 | char *context_offset = (char *) &th->context + mappings[r]; | |
171 | ||
172 | long l; | |
173 | if (r == FCS_REGNUM) | |
174 | { | |
175 | l = *((long *) context_offset) & 0xffff; | |
176 | supply_register (r, (char *) &l); | |
177 | } | |
178 | else if (r == FOP_REGNUM) | |
179 | { | |
180 | l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1); | |
181 | supply_register (r, (char *) &l); | |
182 | } | |
183 | else | |
184 | supply_register (r, context_offset); | |
185 | } | |
186 | ||
187 | /* Store a new register value into the thread context of TH. */ | |
188 | static void | |
189 | i386_store_inferior_register (win32_thread_info *th, int r) | |
190 | { | |
191 | char *context_offset = (char *) &th->context + mappings[r]; | |
192 | collect_register (r, context_offset); | |
193 | } | |
194 | ||
68070c10 | 195 | struct win32_target_ops the_low_target = { |
68070c10 | 196 | sizeof (mappings) / sizeof (mappings[0]), |
34b34921 PA |
197 | i386_initial_stuff, |
198 | i386_get_thread_context, | |
199 | i386_set_thread_context, | |
200 | i386_thread_added, | |
201 | i386_fetch_inferior_register, | |
202 | i386_store_inferior_register, | |
203 | i386_single_step, | |
204 | NULL, /* breakpoint */ | |
68070c10 PA |
205 | 0, /* breakpoint_len */ |
206 | "i386" /* arch_string */ | |
207 | }; |