1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
//===-- RegisterContextWindows.cpp ----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/windows/HostThreadWindows.h"
#include "lldb/Host/windows/windows.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Status.h"
#include "lldb/lldb-private-types.h"
#include "ProcessWindowsLog.h"
#include "RegisterContextWindows.h"
#include "TargetThreadWindows.h"
#include "llvm/ADT/STLExtras.h"
#include "lldb/Target/Target.h"
using namespace lldb;
using namespace lldb_private;
const DWORD kWinContextFlags = CONTEXT_ALL;
// Constructors and Destructors
RegisterContextWindows::RegisterContextWindows(Thread &thread,
uint32_t concrete_frame_idx)
: RegisterContext(thread, concrete_frame_idx), m_context(),
m_context_stale(true) {}
RegisterContextWindows::~RegisterContextWindows() {}
void RegisterContextWindows::InvalidateAllRegisters() {
m_context_stale = true;
}
bool RegisterContextWindows::ReadAllRegisterValues(
lldb::WritableDataBufferSP &data_sp) {
if (!CacheAllRegisterValues())
return false;
data_sp.reset(new DataBufferHeap(sizeof(CONTEXT), 0));
memcpy(data_sp->GetBytes(), &m_context, sizeof(m_context));
return true;
}
bool RegisterContextWindows::WriteAllRegisterValues(
const lldb::DataBufferSP &data_sp) {
assert(data_sp->GetByteSize() >= sizeof(m_context));
memcpy(&m_context, data_sp->GetBytes(), sizeof(m_context));
return ApplyAllRegisterValues();
}
uint32_t RegisterContextWindows::ConvertRegisterKindToRegisterNumber(
lldb::RegisterKind kind, uint32_t num) {
const uint32_t num_regs = GetRegisterCount();
assert(kind < kNumRegisterKinds);
for (uint32_t reg_idx = 0; reg_idx < num_regs; ++reg_idx) {
const RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg_idx);
if (reg_info->kinds[kind] == num)
return reg_idx;
}
return LLDB_INVALID_REGNUM;
}
bool RegisterContextWindows::HardwareSingleStep(bool enable) { return false; }
bool RegisterContextWindows::AddHardwareBreakpoint(uint32_t slot,
lldb::addr_t address,
uint32_t size, bool read,
bool write) {
if (slot >= NUM_HARDWARE_BREAKPOINT_SLOTS)
return false;
switch (size) {
case 1:
case 2:
case 4:
#if defined(_WIN64)
case 8:
#endif
break;
default:
return false;
}
if (!CacheAllRegisterValues())
return false;
#if defined(__i386__) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_AMD64)
unsigned shift = 2 * slot;
m_context.Dr7 |= 1ULL << shift;
(&m_context.Dr0)[slot] = address;
shift = 18 + 4 * slot;
m_context.Dr7 &= ~(3ULL << shift);
m_context.Dr7 |= (size == 8 ? 2ULL : size - 1) << shift;
shift = 16 + 4 * slot;
m_context.Dr7 &= ~(3ULL << shift);
m_context.Dr7 |= (read ? 3ULL : (write ? 1ULL : 0)) << shift;
return ApplyAllRegisterValues();
#else
Log *log = GetLog(WindowsLog::Registers);
LLDB_LOG(log, "hardware breakpoints not currently supported on this arch");
return false;
#endif
}
bool RegisterContextWindows::RemoveHardwareBreakpoint(uint32_t slot) {
if (slot >= NUM_HARDWARE_BREAKPOINT_SLOTS)
return false;
if (!CacheAllRegisterValues())
return false;
#if defined(__i386__) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_AMD64)
unsigned shift = 2 * slot;
m_context.Dr7 &= ~(1ULL << shift);
return ApplyAllRegisterValues();
#else
return false;
#endif
}
uint32_t RegisterContextWindows::GetTriggeredHardwareBreakpointSlotId() {
if (!CacheAllRegisterValues())
return LLDB_INVALID_INDEX32;
#if defined(__i386__) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_AMD64)
for (unsigned i = 0UL; i < NUM_HARDWARE_BREAKPOINT_SLOTS; i++)
if (m_context.Dr6 & (1ULL << i))
return i;
#endif
return LLDB_INVALID_INDEX32;
}
bool RegisterContextWindows::CacheAllRegisterValues() {
Log *log = GetLog(WindowsLog::Registers);
if (!m_context_stale)
return true;
TargetThreadWindows &wthread = static_cast<TargetThreadWindows &>(m_thread);
memset(&m_context, 0, sizeof(m_context));
m_context.ContextFlags = kWinContextFlags;
if (::SuspendThread(
wthread.GetHostThread().GetNativeThread().GetSystemHandle()) ==
(DWORD)-1) {
return false;
}
if (!::GetThreadContext(
wthread.GetHostThread().GetNativeThread().GetSystemHandle(),
&m_context)) {
LLDB_LOG(
log,
"GetThreadContext failed with error {0} while caching register values.",
::GetLastError());
return false;
}
if (::ResumeThread(
wthread.GetHostThread().GetNativeThread().GetSystemHandle()) ==
(DWORD)-1) {
return false;
}
LLDB_LOG(log, "successfully updated the register values.");
m_context_stale = false;
return true;
}
bool RegisterContextWindows::ApplyAllRegisterValues() {
TargetThreadWindows &wthread = static_cast<TargetThreadWindows &>(m_thread);
return ::SetThreadContext(
wthread.GetHostThread().GetNativeThread().GetSystemHandle(), &m_context);
}
|
