DNBBreakpoint.h
5.36 KB
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
//===-- DNBBreakpoint.h -----------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Created by Greg Clayton on 6/29/07.
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_TOOLS_DEBUGSERVER_SOURCE_DNBBREAKPOINT_H
#define LLDB_TOOLS_DEBUGSERVER_SOURCE_DNBBREAKPOINT_H
#include <mach/mach.h>
#include <map>
#include <vector>
#include "DNBDefs.h"
class MachProcess;
class DNBBreakpoint {
public:
DNBBreakpoint(nub_addr_t m_addr, nub_size_t byte_size, bool hardware);
~DNBBreakpoint();
nub_size_t ByteSize() const { return m_byte_size; }
uint8_t *SavedOpcodeBytes() { return &m_opcode[0]; }
const uint8_t *SavedOpcodeBytes() const { return &m_opcode[0]; }
nub_addr_t Address() const { return m_addr; }
// nub_thread_t ThreadID() const { return m_tid; }
bool IsEnabled() const { return m_enabled; }
bool IntersectsRange(nub_addr_t addr, nub_size_t size,
nub_addr_t *intersect_addr, nub_size_t *intersect_size,
nub_size_t *opcode_offset) const {
// We only use software traps for software breakpoints
if (IsBreakpoint() && IsEnabled() && !IsHardware()) {
if (m_byte_size > 0) {
const nub_addr_t bp_end_addr = m_addr + m_byte_size;
const nub_addr_t end_addr = addr + size;
// Is the breakpoint end address before the passed in start address?
if (bp_end_addr <= addr)
return false;
// Is the breakpoint start address after passed in end address?
if (end_addr <= m_addr)
return false;
if (intersect_addr || intersect_size || opcode_offset) {
if (m_addr < addr) {
if (intersect_addr)
*intersect_addr = addr;
if (intersect_size)
*intersect_size =
std::min<nub_addr_t>(bp_end_addr, end_addr) - addr;
if (opcode_offset)
*opcode_offset = addr - m_addr;
} else {
if (intersect_addr)
*intersect_addr = m_addr;
if (intersect_size)
*intersect_size =
std::min<nub_addr_t>(bp_end_addr, end_addr) - m_addr;
if (opcode_offset)
*opcode_offset = 0;
}
}
return true;
}
}
return false;
}
void SetEnabled(bool enabled) {
if (!enabled)
SetHardwareIndex(INVALID_NUB_HW_INDEX);
m_enabled = enabled;
}
void SetIsWatchpoint(uint32_t type) {
m_is_watchpoint = 1;
m_watch_read = (type & WATCH_TYPE_READ) != 0;
m_watch_write = (type & WATCH_TYPE_WRITE) != 0;
}
bool IsBreakpoint() const { return m_is_watchpoint == 0; }
bool IsWatchpoint() const { return m_is_watchpoint == 1; }
bool WatchpointRead() const { return m_watch_read != 0; }
bool WatchpointWrite() const { return m_watch_write != 0; }
bool HardwarePreferred() const { return m_hw_preferred; }
bool IsHardware() const { return m_hw_index != INVALID_NUB_HW_INDEX; }
uint32_t GetHardwareIndex() const { return m_hw_index; }
void SetHardwareIndex(uint32_t hw_index) { m_hw_index = hw_index; }
void Dump() const;
uint32_t Retain() { return ++m_retain_count; }
uint32_t Release() {
if (m_retain_count == 0)
return 0;
return --m_retain_count;
}
private:
uint32_t m_retain_count; // Each breakpoint is maintained by address and is
// ref counted in case multiple people set a
// breakpoint at the same address
uint32_t m_byte_size; // Length in bytes of the breakpoint if set in memory
uint8_t m_opcode[8]; // Saved opcode bytes
nub_addr_t m_addr; // Address of this breakpoint
uint32_t m_enabled : 1, // Flags for this breakpoint
m_hw_preferred : 1, // 1 if this point has been requested to be set using
// hardware (which may fail due to lack of resources)
m_is_watchpoint : 1, // 1 if this is a watchpoint
m_watch_read : 1, // 1 if we stop when the watched data is read from
m_watch_write : 1; // 1 if we stop when the watched data is written to
uint32_t
m_hw_index; // The hardware resource index for this breakpoint/watchpoint
};
class DNBBreakpointList {
public:
DNBBreakpointList();
~DNBBreakpointList();
DNBBreakpoint *Add(nub_addr_t addr, nub_size_t length, bool hardware);
bool Remove(nub_addr_t addr);
DNBBreakpoint *FindByAddress(nub_addr_t addr);
const DNBBreakpoint *FindByAddress(nub_addr_t addr) const;
size_t FindBreakpointsThatOverlapRange(nub_addr_t addr, nub_addr_t size,
std::vector<DNBBreakpoint *> &bps);
void Dump() const;
size_t Size() const { return m_breakpoints.size(); }
void DisableAll();
void RemoveTrapsFromBuffer(nub_addr_t addr, nub_size_t size, void *buf) const;
void DisableAllBreakpoints(MachProcess *process);
void DisableAllWatchpoints(MachProcess *process);
void RemoveDisabled();
protected:
typedef std::map<nub_addr_t, DNBBreakpoint> collection;
typedef collection::iterator iterator;
typedef collection::const_iterator const_iterator;
collection m_breakpoints;
};
#endif